TOMOYO Linux Cross Reference
Linux/sound/pci/hda/hda_codec.c

   // SPDX-License-Identifier: GPL-2.0-or-later
   /*
    * Universal Interface for Intel High Definition Audio Codec
    *
    * Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
    */
   
   #include <linux/init.h>
   #include <linux/delay.h>
  #include <linux/slab.h>
  #include <linux/mutex.h>
  #include <linux/module.h>
  #include <linux/pm.h>
  #include <linux/pm_runtime.h>
  #include <sound/core.h>
  #include <sound/hda_codec.h>
  #include <sound/asoundef.h>
  #include <sound/tlv.h>
  #include <sound/initval.h>
  #include <sound/jack.h>
  #include "hda_local.h"
  #include "hda_beep.h"
  #include "hda_jack.h"
  #include <sound/hda_hwdep.h>
  #include <sound/hda_component.h>
  
  #define codec_in_pm(codec)              snd_hdac_is_in_pm(&codec->core)
  #define hda_codec_is_power_on(codec)    snd_hdac_is_power_on(&codec->core)
  #define codec_has_epss(codec) \
          ((codec)->core.power_caps & AC_PWRST_EPSS)
  #define codec_has_clkstop(codec) \
          ((codec)->core.power_caps & AC_PWRST_CLKSTOP)
  
  /*
   * Send and receive a verb - passed to exec_verb override for hdac_device
   */
  static int codec_exec_verb(struct hdac_device *dev, unsigned int cmd,
                             unsigned int flags, unsigned int *res)
  {
          struct hda_codec *codec = container_of(dev, struct hda_codec, core);
          struct hda_bus *bus = codec->bus;
          int err;
  
          if (cmd == ~0)
                  return -1;
  
   again:
          snd_hda_power_up_pm(codec);
          mutex_lock(&bus->core.cmd_mutex);
          if (flags & HDA_RW_NO_RESPONSE_FALLBACK)
                  bus->no_response_fallback = 1;
          err = snd_hdac_bus_exec_verb_unlocked(&bus->core, codec->core.addr,
                                                cmd, res);
          bus->no_response_fallback = 0;
          mutex_unlock(&bus->core.cmd_mutex);
          snd_hda_power_down_pm(codec);
          if (!codec_in_pm(codec) && res && err == -EAGAIN) {
                  if (bus->response_reset) {
                          codec_dbg(codec,
                                    "resetting BUS due to fatal communication error\n");
                          snd_hda_bus_reset(bus);
                  }
                  goto again;
          }
          /* clear reset-flag when the communication gets recovered */
          if (!err || codec_in_pm(codec))
                  bus->response_reset = 0;
          return err;
  }
  
  /**
   * snd_hda_sequence_write - sequence writes
   * @codec: the HDA codec
   * @seq: VERB array to send
   *
   * Send the commands sequentially from the given array.
   * The array must be terminated with NID=0.
   */
  void snd_hda_sequence_write(struct hda_codec *codec, const struct hda_verb *seq)
  {
          for (; seq->nid; seq++)
                  snd_hda_codec_write(codec, seq->nid, 0, seq->verb, seq->param);
  }
  EXPORT_SYMBOL_GPL(snd_hda_sequence_write);
  
  /* connection list element */
  struct hda_conn_list {
          struct list_head list;
          int len;
          hda_nid_t nid;
          hda_nid_t conns[] __counted_by(len);
  };
  
  /* look up the cached results */
  static struct hda_conn_list *
  lookup_conn_list(struct hda_codec *codec, hda_nid_t nid)
  {
          struct hda_conn_list *p;
          list_for_each_entry(p, &codec->conn_list, list) {
                 if (p->nid == nid)
                         return p;
         }
         return NULL;
 }
 
 static int add_conn_list(struct hda_codec *codec, hda_nid_t nid, int len,
                          const hda_nid_t *list)
 {
         struct hda_conn_list *p;
 
         p = kmalloc(struct_size(p, conns, len), GFP_KERNEL);
         if (!p)
                 return -ENOMEM;
         p->len = len;
         p->nid = nid;
         memcpy(p->conns, list, len * sizeof(hda_nid_t));
         list_add(&p->list, &codec->conn_list);
         return 0;
 }
 
 static void remove_conn_list(struct hda_codec *codec)
 {
         while (!list_empty(&codec->conn_list)) {
                 struct hda_conn_list *p;
                 p = list_first_entry(&codec->conn_list, typeof(*p), list);
                 list_del(&p->list);
                 kfree(p);
         }
 }
 
 /* read the connection and add to the cache */
 static int read_and_add_raw_conns(struct hda_codec *codec, hda_nid_t nid)
 {
         hda_nid_t list[32];
         hda_nid_t *result = list;
         int len;
 
         len = snd_hda_get_raw_connections(codec, nid, list, ARRAY_SIZE(list));
         if (len == -ENOSPC) {
                 len = snd_hda_get_num_raw_conns(codec, nid);
                 result = kmalloc_array(len, sizeof(hda_nid_t), GFP_KERNEL);
                 if (!result)
                         return -ENOMEM;
                 len = snd_hda_get_raw_connections(codec, nid, result, len);
         }
         if (len >= 0)
                 len = snd_hda_override_conn_list(codec, nid, len, result);
         if (result != list)
                 kfree(result);
         return len;
 }
 
 /**
  * snd_hda_get_conn_list - get connection list
  * @codec: the HDA codec
  * @nid: NID to parse
  * @listp: the pointer to store NID list
  *
  * Parses the connection list of the given widget and stores the pointer
  * to the list of NIDs.
  *
  * Returns the number of connections, or a negative error code.
  *
  * Note that the returned pointer isn't protected against the list
  * modification.  If snd_hda_override_conn_list() might be called
  * concurrently, protect with a mutex appropriately.
  */
 int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid,
                           const hda_nid_t **listp)
 {
         bool added = false;
 
         for (;;) {
                 int err;
                 const struct hda_conn_list *p;
 
                 /* if the connection-list is already cached, read it */
                 p = lookup_conn_list(codec, nid);
                 if (p) {
                         if (listp)
                                 *listp = p->conns;
                         return p->len;
                 }
                 if (snd_BUG_ON(added))
                         return -EINVAL;
 
                 err = read_and_add_raw_conns(codec, nid);
                 if (err < 0)
                         return err;
                 added = true;
         }
 }
 EXPORT_SYMBOL_GPL(snd_hda_get_conn_list);
 
 /**
  * snd_hda_get_connections - copy connection list
  * @codec: the HDA codec
  * @nid: NID to parse
  * @conn_list: connection list array; when NULL, checks only the size
  * @max_conns: max. number of connections to store
  *
  * Parses the connection list of the given widget and stores the list
  * of NIDs.
  *
  * Returns the number of connections, or a negative error code.
  */
 int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
                             hda_nid_t *conn_list, int max_conns)
 {
         const hda_nid_t *list;
         int len = snd_hda_get_conn_list(codec, nid, &list);
 
         if (len > 0 && conn_list) {
                 if (len > max_conns) {
                         codec_err(codec, "Too many connections %d for NID 0x%x\n",
                                    len, nid);
                         return -EINVAL;
                 }
                 memcpy(conn_list, list, len * sizeof(hda_nid_t));
         }
 
         return len;
 }
 EXPORT_SYMBOL_GPL(snd_hda_get_connections);
 
 /**
  * snd_hda_override_conn_list - add/modify the connection-list to cache
  * @codec: the HDA codec
  * @nid: NID to parse
  * @len: number of connection list entries
  * @list: the list of connection entries
  *
  * Add or modify the given connection-list to the cache.  If the corresponding
  * cache already exists, invalidate it and append a new one.
  *
  * Returns zero or a negative error code.
  */
 int snd_hda_override_conn_list(struct hda_codec *codec, hda_nid_t nid, int len,
                                const hda_nid_t *list)
 {
         struct hda_conn_list *p;
 
         p = lookup_conn_list(codec, nid);
         if (p) {
                 list_del(&p->list);
                 kfree(p);
         }
 
         return add_conn_list(codec, nid, len, list);
 }
 EXPORT_SYMBOL_GPL(snd_hda_override_conn_list);
 
 /**
  * snd_hda_get_conn_index - get the connection index of the given NID
  * @codec: the HDA codec
  * @mux: NID containing the list
  * @nid: NID to select
  * @recursive: 1 when searching NID recursively, otherwise 0
  *
  * Parses the connection list of the widget @mux and checks whether the
  * widget @nid is present.  If it is, return the connection index.
  * Otherwise it returns -1.
  */
 int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux,
                            hda_nid_t nid, int recursive)
 {
         const hda_nid_t *conn;
         int i, nums;
 
         nums = snd_hda_get_conn_list(codec, mux, &conn);
         for (i = 0; i < nums; i++)
                 if (conn[i] == nid)
                         return i;
         if (!recursive)
                 return -1;
         if (recursive > 10) {
                 codec_dbg(codec, "too deep connection for 0x%x\n", nid);
                 return -1;
         }
         recursive++;
         for (i = 0; i < nums; i++) {
                 unsigned int type = get_wcaps_type(get_wcaps(codec, conn[i]));
                 if (type == AC_WID_PIN || type == AC_WID_AUD_OUT)
                         continue;
                 if (snd_hda_get_conn_index(codec, conn[i], nid, recursive) >= 0)
                         return i;
         }
         return -1;
 }
 EXPORT_SYMBOL_GPL(snd_hda_get_conn_index);
 
 /**
  * snd_hda_get_num_devices - get DEVLIST_LEN parameter of the given widget
  *  @codec: the HDA codec
  *  @nid: NID of the pin to parse
  *
  * Get the device entry number on the given widget. This is a feature of
  * DP MST audio. Each pin can have several device entries in it.
  */
 unsigned int snd_hda_get_num_devices(struct hda_codec *codec, hda_nid_t nid)
 {
         unsigned int wcaps = get_wcaps(codec, nid);
         unsigned int parm;
 
         if (!codec->dp_mst || !(wcaps & AC_WCAP_DIGITAL) ||
             get_wcaps_type(wcaps) != AC_WID_PIN)
                 return 0;
 
         parm = snd_hdac_read_parm_uncached(&codec->core, nid, AC_PAR_DEVLIST_LEN);
         if (parm == -1)
                 parm = 0;
         return parm & AC_DEV_LIST_LEN_MASK;
 }
 EXPORT_SYMBOL_GPL(snd_hda_get_num_devices);
 
 /**
  * snd_hda_get_devices - copy device list without cache
  * @codec: the HDA codec
  * @nid: NID of the pin to parse
  * @dev_list: device list array
  * @max_devices: max. number of devices to store
  *
  * Copy the device list. This info is dynamic and so not cached.
  * Currently called only from hda_proc.c, so not exported.
  */
 int snd_hda_get_devices(struct hda_codec *codec, hda_nid_t nid,
                         u8 *dev_list, int max_devices)
 {
         unsigned int parm;
         int i, dev_len, devices;
 
         parm = snd_hda_get_num_devices(codec, nid);
         if (!parm)      /* not multi-stream capable */
                 return 0;
 
         dev_len = parm + 1;
         dev_len = dev_len < max_devices ? dev_len : max_devices;
 
         devices = 0;
         while (devices < dev_len) {
                 if (snd_hdac_read(&codec->core, nid,
                                   AC_VERB_GET_DEVICE_LIST, devices, &parm))
                         break; /* error */
 
                 for (i = 0; i < 8; i++) {
                         dev_list[devices] = (u8)parm;
                         parm >>= 4;
                         devices++;
                         if (devices >= dev_len)
                                 break;
                 }
         }
         return devices;
 }
 
 /**
  * snd_hda_get_dev_select - get device entry select on the pin
  * @codec: the HDA codec
  * @nid: NID of the pin to get device entry select
  *
  * Get the devcie entry select on the pin. Return the device entry
  * id selected on the pin. Return 0 means the first device entry
  * is selected or MST is not supported.
  */
 int snd_hda_get_dev_select(struct hda_codec *codec, hda_nid_t nid)
 {
         /* not support dp_mst will always return 0, using first dev_entry */
         if (!codec->dp_mst)
                 return 0;
 
         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_DEVICE_SEL, 0);
 }
 EXPORT_SYMBOL_GPL(snd_hda_get_dev_select);
 
 /**
  * snd_hda_set_dev_select - set device entry select on the pin
  * @codec: the HDA codec
  * @nid: NID of the pin to set device entry select
  * @dev_id: device entry id to be set
  *
  * Set the device entry select on the pin nid.
  */
 int snd_hda_set_dev_select(struct hda_codec *codec, hda_nid_t nid, int dev_id)
 {
         int ret, num_devices;
 
         /* not support dp_mst will always return 0, using first dev_entry */
         if (!codec->dp_mst)
                 return 0;
 
         /* AC_PAR_DEVLIST_LEN is 0 based. */
         num_devices = snd_hda_get_num_devices(codec, nid) + 1;
         /* If Device List Length is 0 (num_device = 1),
          * the pin is not multi stream capable.
          * Do nothing in this case.
          */
         if (num_devices == 1)
                 return 0;
 
         /* Behavior of setting index being equal to or greater than
          * Device List Length is not predictable
          */
         if (num_devices <= dev_id)
                 return -EINVAL;
 
         ret = snd_hda_codec_write(codec, nid, 0,
                         AC_VERB_SET_DEVICE_SEL, dev_id);
 
         return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hda_set_dev_select);
 
 /*
  * read widget caps for each widget and store in cache
  */
 static int read_widget_caps(struct hda_codec *codec, hda_nid_t fg_node)
 {
         int i;
         hda_nid_t nid;
 
         codec->wcaps = kmalloc_array(codec->core.num_nodes, 4, GFP_KERNEL);
         if (!codec->wcaps)
                 return -ENOMEM;
         nid = codec->core.start_nid;
         for (i = 0; i < codec->core.num_nodes; i++, nid++)
                 codec->wcaps[i] = snd_hdac_read_parm_uncached(&codec->core,
                                         nid, AC_PAR_AUDIO_WIDGET_CAP);
         return 0;
 }
 
 /* read all pin default configurations and save codec->init_pins */
 static int read_pin_defaults(struct hda_codec *codec)
 {
         hda_nid_t nid;
 
         for_each_hda_codec_node(nid, codec) {
                 struct hda_pincfg *pin;
                 unsigned int wcaps = get_wcaps(codec, nid);
                 unsigned int wid_type = get_wcaps_type(wcaps);
                 if (wid_type != AC_WID_PIN)
                         continue;
                 pin = snd_array_new(&codec->init_pins);
                 if (!pin)
                         return -ENOMEM;
                 pin->nid = nid;
                 pin->cfg = snd_hda_codec_read(codec, nid, 0,
                                               AC_VERB_GET_CONFIG_DEFAULT, 0);
                 /*
                  * all device entries are the same widget control so far
                  * fixme: if any codec is different, need fix here
                  */
                 pin->ctrl = snd_hda_codec_read(codec, nid, 0,
                                                AC_VERB_GET_PIN_WIDGET_CONTROL,
                                                0);
         }
         return 0;
 }
 
 /* look up the given pin config list and return the item matching with NID */
 static struct hda_pincfg *look_up_pincfg(struct hda_codec *codec,
                                          struct snd_array *array,
                                          hda_nid_t nid)
 {
         struct hda_pincfg *pin;
         int i;
 
         snd_array_for_each(array, i, pin) {
                 if (pin->nid == nid)
                         return pin;
         }
         return NULL;
 }
 
 /* set the current pin config value for the given NID.
  * the value is cached, and read via snd_hda_codec_get_pincfg()
  */
 int snd_hda_add_pincfg(struct hda_codec *codec, struct snd_array *list,
                        hda_nid_t nid, unsigned int cfg)
 {
         struct hda_pincfg *pin;
 
         /* the check below may be invalid when pins are added by a fixup
          * dynamically (e.g. via snd_hda_codec_update_widgets()), so disabled
          * for now
          */
         /*
         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
                 return -EINVAL;
         */
 
         pin = look_up_pincfg(codec, list, nid);
         if (!pin) {
                 pin = snd_array_new(list);
                 if (!pin)
                         return -ENOMEM;
                 pin->nid = nid;
         }
         pin->cfg = cfg;
         return 0;
 }
 
 /**
  * snd_hda_codec_set_pincfg - Override a pin default configuration
  * @codec: the HDA codec
  * @nid: NID to set the pin config
  * @cfg: the pin default config value
  *
  * Override a pin default configuration value in the cache.
  * This value can be read by snd_hda_codec_get_pincfg() in a higher
  * priority than the real hardware value.
  */
 int snd_hda_codec_set_pincfg(struct hda_codec *codec,
                              hda_nid_t nid, unsigned int cfg)
 {
         return snd_hda_add_pincfg(codec, &codec->driver_pins, nid, cfg);
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_set_pincfg);
 
 /**
  * snd_hda_codec_get_pincfg - Obtain a pin-default configuration
  * @codec: the HDA codec
  * @nid: NID to get the pin config
  *
  * Get the current pin config value of the given pin NID.
  * If the pincfg value is cached or overridden via sysfs or driver,
  * returns the cached value.
  */
 unsigned int snd_hda_codec_get_pincfg(struct hda_codec *codec, hda_nid_t nid)
 {
         struct hda_pincfg *pin;
 
 #ifdef CONFIG_SND_HDA_RECONFIG
         {
                 unsigned int cfg = 0;
                 mutex_lock(&codec->user_mutex);
                 pin = look_up_pincfg(codec, &codec->user_pins, nid);
                 if (pin)
                         cfg = pin->cfg;
                 mutex_unlock(&codec->user_mutex);
                 if (cfg)
                         return cfg;
         }
 #endif
         pin = look_up_pincfg(codec, &codec->driver_pins, nid);
         if (pin)
                 return pin->cfg;
         pin = look_up_pincfg(codec, &codec->init_pins, nid);
         if (pin)
                 return pin->cfg;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_get_pincfg);
 
 /**
  * snd_hda_codec_set_pin_target - remember the current pinctl target value
  * @codec: the HDA codec
  * @nid: pin NID
  * @val: assigned pinctl value
  *
  * This function stores the given value to a pinctl target value in the
  * pincfg table.  This isn't always as same as the actually written value
  * but can be referred at any time via snd_hda_codec_get_pin_target().
  */
 int snd_hda_codec_set_pin_target(struct hda_codec *codec, hda_nid_t nid,
                                  unsigned int val)
 {
         struct hda_pincfg *pin;
 
         pin = look_up_pincfg(codec, &codec->init_pins, nid);
         if (!pin)
                 return -EINVAL;
         pin->target = val;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_set_pin_target);
 
 /**
  * snd_hda_codec_get_pin_target - return the current pinctl target value
  * @codec: the HDA codec
  * @nid: pin NID
  */
 int snd_hda_codec_get_pin_target(struct hda_codec *codec, hda_nid_t nid)
 {
         struct hda_pincfg *pin;
 
         pin = look_up_pincfg(codec, &codec->init_pins, nid);
         if (!pin)
                 return 0;
         return pin->target;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_get_pin_target);
 
 /**
  * snd_hda_shutup_pins - Shut up all pins
  * @codec: the HDA codec
  *
  * Clear all pin controls to shup up before suspend for avoiding click noise.
  * The controls aren't cached so that they can be resumed properly.
  */
 void snd_hda_shutup_pins(struct hda_codec *codec)
 {
         const struct hda_pincfg *pin;
         int i;
 
         /* don't shut up pins when unloading the driver; otherwise it breaks
          * the default pin setup at the next load of the driver
          */
         if (codec->bus->shutdown)
                 return;
         snd_array_for_each(&codec->init_pins, i, pin) {
                 /* use read here for syncing after issuing each verb */
                 snd_hda_codec_read(codec, pin->nid, 0,
                                    AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
         }
         codec->pins_shutup = 1;
 }
 EXPORT_SYMBOL_GPL(snd_hda_shutup_pins);
 
 /* Restore the pin controls cleared previously via snd_hda_shutup_pins() */
 static void restore_shutup_pins(struct hda_codec *codec)
 {
         const struct hda_pincfg *pin;
         int i;
 
         if (!codec->pins_shutup)
                 return;
         if (codec->bus->shutdown)
                 return;
         snd_array_for_each(&codec->init_pins, i, pin) {
                 snd_hda_codec_write(codec, pin->nid, 0,
                                     AC_VERB_SET_PIN_WIDGET_CONTROL,
                                     pin->ctrl);
         }
         codec->pins_shutup = 0;
 }
 
 static void hda_jackpoll_work(struct work_struct *work)
 {
         struct hda_codec *codec =
                 container_of(work, struct hda_codec, jackpoll_work.work);
 
         /* for non-polling trigger: we need nothing if already powered on */
         if (!codec->jackpoll_interval && snd_hdac_is_power_on(&codec->core))
                 return;
 
         /* the power-up/down sequence triggers the runtime resume */
         snd_hda_power_up_pm(codec);
         /* update jacks manually if polling is required, too */
         if (codec->jackpoll_interval) {
                 snd_hda_jack_set_dirty_all(codec);
                 snd_hda_jack_poll_all(codec);
         }
         snd_hda_power_down_pm(codec);
 
         if (!codec->jackpoll_interval)
                 return;
 
         schedule_delayed_work(&codec->jackpoll_work,
                               codec->jackpoll_interval);
 }
 
 /* release all pincfg lists */
 static void free_init_pincfgs(struct hda_codec *codec)
 {
         snd_array_free(&codec->driver_pins);
 #ifdef CONFIG_SND_HDA_RECONFIG
         snd_array_free(&codec->user_pins);
 #endif
         snd_array_free(&codec->init_pins);
 }
 
 /*
  * audio-converter setup caches
  */
 struct hda_cvt_setup {
         hda_nid_t nid;
         u8 stream_tag;
         u8 channel_id;
         u16 format_id;
         unsigned char active;   /* cvt is currently used */
         unsigned char dirty;    /* setups should be cleared */
 };
 
 /* get or create a cache entry for the given audio converter NID */
 static struct hda_cvt_setup *
 get_hda_cvt_setup(struct hda_codec *codec, hda_nid_t nid)
 {
         struct hda_cvt_setup *p;
         int i;
 
         snd_array_for_each(&codec->cvt_setups, i, p) {
                 if (p->nid == nid)
                         return p;
         }
         p = snd_array_new(&codec->cvt_setups);
         if (p)
                 p->nid = nid;
         return p;
 }
 
 /*
  * PCM device
  */
 void snd_hda_codec_pcm_put(struct hda_pcm *pcm)
 {
         if (refcount_dec_and_test(&pcm->codec->pcm_ref))
                 wake_up(&pcm->codec->remove_sleep);
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_pcm_put);
 
 struct hda_pcm *snd_hda_codec_pcm_new(struct hda_codec *codec,
                                       const char *fmt, ...)
 {
         struct hda_pcm *pcm;
         va_list args;
 
         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
         if (!pcm)
                 return NULL;
 
         pcm->codec = codec;
         va_start(args, fmt);
         pcm->name = kvasprintf(GFP_KERNEL, fmt, args);
         va_end(args);
         if (!pcm->name) {
                 kfree(pcm);
                 return NULL;
         }
 
         list_add_tail(&pcm->list, &codec->pcm_list_head);
         refcount_inc(&codec->pcm_ref);
         return pcm;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_pcm_new);
 
 /*
  * codec destructor
  */
 void snd_hda_codec_disconnect_pcms(struct hda_codec *codec)
 {
         struct hda_pcm *pcm;
 
         list_for_each_entry(pcm, &codec->pcm_list_head, list) {
                 if (pcm->disconnected)
                         continue;
                 if (pcm->pcm)
                         snd_device_disconnect(codec->card, pcm->pcm);
                 snd_hda_codec_pcm_put(pcm);
                 pcm->disconnected = 1;
         }
 }
 
 static void codec_release_pcms(struct hda_codec *codec)
 {
         struct hda_pcm *pcm, *n;
 
         list_for_each_entry_safe(pcm, n, &codec->pcm_list_head, list) {
                 list_del(&pcm->list);
                 if (pcm->pcm)
                         snd_device_free(pcm->codec->card, pcm->pcm);
                 clear_bit(pcm->device, pcm->codec->bus->pcm_dev_bits);
                 kfree(pcm->name);
                 kfree(pcm);
         }
 }
 
 /**
  * snd_hda_codec_cleanup_for_unbind - Prepare codec for removal
  * @codec: codec device to cleanup
  */
 void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec)
 {
         if (codec->core.registered) {
                 /* pm_runtime_put() is called in snd_hdac_device_exit() */
                 pm_runtime_get_noresume(hda_codec_dev(codec));
                 pm_runtime_disable(hda_codec_dev(codec));
                 codec->core.registered = 0;
         }
 
         snd_hda_codec_disconnect_pcms(codec);
         cancel_delayed_work_sync(&codec->jackpoll_work);
         if (!codec->in_freeing)
                 snd_hda_ctls_clear(codec);
         codec_release_pcms(codec);
         snd_hda_detach_beep_device(codec);
         memset(&codec->patch_ops, 0, sizeof(codec->patch_ops));
         snd_hda_jack_tbl_clear(codec);
         codec->proc_widget_hook = NULL;
         codec->spec = NULL;
 
         /* free only driver_pins so that init_pins + user_pins are restored */
         snd_array_free(&codec->driver_pins);
         snd_array_free(&codec->cvt_setups);
         snd_array_free(&codec->spdif_out);
         snd_array_free(&codec->verbs);
         codec->follower_dig_outs = NULL;
         codec->spdif_status_reset = 0;
         snd_array_free(&codec->mixers);
         snd_array_free(&codec->nids);
         remove_conn_list(codec);
         snd_hdac_regmap_exit(&codec->core);
         codec->configured = 0;
         refcount_set(&codec->pcm_ref, 1); /* reset refcount */
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_cleanup_for_unbind);
 
 static unsigned int hda_set_power_state(struct hda_codec *codec,
                                 unsigned int power_state);
 
 /* enable/disable display power per codec */
 void snd_hda_codec_display_power(struct hda_codec *codec, bool enable)
 {
         if (codec->display_power_control)
                 snd_hdac_display_power(&codec->bus->core, codec->addr, enable);
 }
 
 /**
  * snd_hda_codec_register - Finalize codec initialization
  * @codec: codec device to register
  *
  * Also called from hda_bind.c
  */
 void snd_hda_codec_register(struct hda_codec *codec)
 {
         if (codec->core.registered)
                 return;
         if (device_is_registered(hda_codec_dev(codec))) {
                 snd_hda_codec_display_power(codec, true);
                 pm_runtime_enable(hda_codec_dev(codec));
                 /* it was powered up in snd_hda_codec_new(), now all done */
                 snd_hda_power_down(codec);
                 codec->core.registered = 1;
         }
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_register);
 
 static int snd_hda_codec_dev_register(struct snd_device *device)
 {
         snd_hda_codec_register(device->device_data);
         return 0;
 }
 
 /**
  * snd_hda_codec_unregister - Unregister specified codec device
  * @codec: codec device to unregister
  */
 void snd_hda_codec_unregister(struct hda_codec *codec)
 {
         codec->in_freeing = 1;
         /*
          * snd_hda_codec_device_new() is used by legacy HDA and ASoC driver.
          * We can't unregister ASoC device since it will be unregistered in
          * snd_hdac_ext_bus_device_remove().
          */
         if (codec->core.type == HDA_DEV_LEGACY)
                 snd_hdac_device_unregister(&codec->core);
         snd_hda_codec_display_power(codec, false);
 
         /*
          * In the case of ASoC HD-audio bus, the device refcount is released in
          * snd_hdac_ext_bus_device_remove() explicitly.
          */
         if (codec->core.type == HDA_DEV_LEGACY)
                 put_device(hda_codec_dev(codec));
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_unregister);
 
 static int snd_hda_codec_dev_free(struct snd_device *device)
 {
         snd_hda_codec_unregister(device->device_data);
         return 0;
 }
 
 static void snd_hda_codec_dev_release(struct device *dev)
 {
         struct hda_codec *codec = dev_to_hda_codec(dev);
 
         free_init_pincfgs(codec);
         snd_hdac_device_exit(&codec->core);
         snd_hda_sysfs_clear(codec);
         kfree(codec->modelname);
         kfree(codec->wcaps);
         kfree(codec);
 }
 
 #define DEV_NAME_LEN 31
 
 /**
  * snd_hda_codec_device_init - allocate HDA codec device
  * @bus: codec's parent bus
  * @codec_addr: the codec address on the parent bus
  * @fmt: format string for the device's name
  *
  * Returns newly allocated codec device or ERR_PTR() on failure.
  */
 struct hda_codec *
 snd_hda_codec_device_init(struct hda_bus *bus, unsigned int codec_addr,
                           const char *fmt, ...)
 {
         va_list vargs;
         char name[DEV_NAME_LEN];
         struct hda_codec *codec;
         int err;
 
         if (snd_BUG_ON(!bus))
                 return ERR_PTR(-EINVAL);
         if (snd_BUG_ON(codec_addr > HDA_MAX_CODEC_ADDRESS))
                 return ERR_PTR(-EINVAL);
 
         codec = kzalloc(sizeof(*codec), GFP_KERNEL);
         if (!codec)
                 return ERR_PTR(-ENOMEM);
 
         va_start(vargs, fmt);
         vsprintf(name, fmt, vargs);
         va_end(vargs);
 
         err = snd_hdac_device_init(&codec->core, &bus->core, name, codec_addr);
         if (err < 0) {
                 kfree(codec);
                 return ERR_PTR(err);
         }
 
         codec->bus = bus;
         codec->depop_delay = -1;
         codec->fixup_id = HDA_FIXUP_ID_NOT_SET;
         codec->core.dev.release = snd_hda_codec_dev_release;
         codec->core.type = HDA_DEV_LEGACY;
 
         mutex_init(&codec->spdif_mutex);
         mutex_init(&codec->control_mutex);
         snd_array_init(&codec->mixers, sizeof(struct hda_nid_item), 32);
         snd_array_init(&codec->nids, sizeof(struct hda_nid_item), 32);
         snd_array_init(&codec->init_pins, sizeof(struct hda_pincfg), 16);
         snd_array_init(&codec->driver_pins, sizeof(struct hda_pincfg), 16);
         snd_array_init(&codec->cvt_setups, sizeof(struct hda_cvt_setup), 8);
         snd_array_init(&codec->spdif_out, sizeof(struct hda_spdif_out), 16);
         snd_array_init(&codec->jacktbl, sizeof(struct hda_jack_tbl), 16);
         snd_array_init(&codec->verbs, sizeof(struct hda_verb *), 8);
         INIT_LIST_HEAD(&codec->conn_list);
         INIT_LIST_HEAD(&codec->pcm_list_head);
         INIT_DELAYED_WORK(&codec->jackpoll_work, hda_jackpoll_work);
         refcount_set(&codec->pcm_ref, 1);
         init_waitqueue_head(&codec->remove_sleep);
 
         return codec;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_device_init);
 
 /**
  * snd_hda_codec_new - create a HDA codec
  * @bus: the bus to assign
  * @card: card for this codec
  * @codec_addr: the codec address
  * @codecp: the pointer to store the generated codec
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,
                       unsigned int codec_addr, struct hda_codec **codecp)
 {
         struct hda_codec *codec;
         int ret;
 
         codec = snd_hda_codec_device_init(bus, codec_addr, "hdaudioC%dD%d",
                                           card->number, codec_addr);
         if (IS_ERR(codec))
                 return PTR_ERR(codec);
         *codecp = codec;
 
         ret = snd_hda_codec_device_new(bus, card, codec_addr, *codecp, true);
         if (ret)
                 put_device(hda_codec_dev(*codecp));
 
         return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_new);
 
 int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
                         unsigned int codec_addr, struct hda_codec *codec,
                         bool snddev_managed)
 {
         char component[31];
         hda_nid_t fg;
         int err;
         static const struct snd_device_ops dev_ops = {
                 .dev_register = snd_hda_codec_dev_register,
                 .dev_free = snd_hda_codec_dev_free,
         };
 
         dev_dbg(card->dev, "%s: entry\n", __func__);
 
         if (snd_BUG_ON(!bus))
                 return -EINVAL;
         if (snd_BUG_ON(codec_addr > HDA_MAX_CODEC_ADDRESS))
                 return -EINVAL;
 
         codec->core.exec_verb = codec_exec_verb;
         codec->card = card;
         codec->addr = codec_addr;
 
         codec->power_jiffies = jiffies;
 
         snd_hda_sysfs_init(codec);
 
         if (codec->bus->modelname) {
                 codec->modelname = kstrdup(codec->bus->modelname, GFP_KERNEL);
                 if (!codec->modelname)
                         return -ENOMEM;
         }
 
         fg = codec->core.afg ? codec->core.afg : codec->core.mfg;
         err = read_widget_caps(codec, fg);
         if (err < 0)
                 return err;
         err = read_pin_defaults(codec);
         if (err < 0)
                 return err;
 
         /* power-up all before initialization */
         hda_set_power_state(codec, AC_PWRST_D0);
         codec->core.dev.power.power_state = PMSG_ON;
 
         snd_hda_codec_proc_new(codec);
 
         snd_hda_create_hwdep(codec);
 
         sprintf(component, "HDA:%08x,%08x,%08x", codec->core.vendor_id,
                 codec->core.subsystem_id, codec->core.revision_id);
         snd_component_add(card, component);
 
         if (snddev_managed) {
                 /* ASoC features component management instead */
                 err = snd_device_new(card, SNDRV_DEV_CODEC, codec, &dev_ops);
                 if (err < 0)
                         return err;
         }
 
 #ifdef CONFIG_PM
         /* PM runtime needs to be enabled later after binding codec */
         if (codec->core.dev.power.runtime_auto)
                 pm_runtime_forbid(&codec->core.dev);
         else
                 /* Keep the usage_count consistent across subsequent probing */
                 pm_runtime_get_noresume(&codec->core.dev);
 #endif
 
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_device_new);
 
 /**
  * snd_hda_codec_update_widgets - Refresh widget caps and pin defaults
  * @codec: the HDA codec
  *
  * Forcibly refresh the all widget caps and the init pin configurations of
  * the given codec.
  */
 int snd_hda_codec_update_widgets(struct hda_codec *codec)
 {
         hda_nid_t fg;
         int err;
 
         err = snd_hdac_refresh_widgets(&codec->core);
         if (err < 0)
                 return err;
 
         /* Assume the function group node does not change,
          * only the widget nodes may change.
          */
         kfree(codec->wcaps);
         fg = codec->core.afg ? codec->core.afg : codec->core.mfg;
         err = read_widget_caps(codec, fg);
         if (err < 0)
                 return err;
 
         snd_array_free(&codec->init_pins);
         err = read_pin_defaults(codec);
 
         return err;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_update_widgets);
 
 /* update the stream-id if changed */
 static void update_pcm_stream_id(struct hda_codec *codec,
                                  struct hda_cvt_setup *p, hda_nid_t nid,
                                  u32 stream_tag, int channel_id)
 {
         unsigned int oldval, newval;
 
         if (p->stream_tag != stream_tag || p->channel_id != channel_id) {
                 oldval = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONV, 0);
                 newval = (stream_tag << 4) | channel_id;
                 if (oldval != newval)
                         snd_hda_codec_write(codec, nid, 0,
                                             AC_VERB_SET_CHANNEL_STREAMID,
                                             newval);
                 p->stream_tag = stream_tag;
                 p->channel_id = channel_id;
         }
 }
 
 /* update the format-id if changed */
 static void update_pcm_format(struct hda_codec *codec, struct hda_cvt_setup *p,
                               hda_nid_t nid, int format)
 {
         unsigned int oldval;
 
         if (p->format_id != format) {
                 oldval = snd_hda_codec_read(codec, nid, 0,
                                             AC_VERB_GET_STREAM_FORMAT, 0);
                 if (oldval != format) {
                         msleep(1);
                         snd_hda_codec_write(codec, nid, 0,
                                             AC_VERB_SET_STREAM_FORMAT,
                                             format);
                 }
                 p->format_id = format;
         }
 }
 
 /**
  * snd_hda_codec_setup_stream - set up the codec for streaming
  * @codec: the CODEC to set up
  * @nid: the NID to set up
  * @stream_tag: stream tag to pass, it's between 0x1 and 0xf.
  * @channel_id: channel id to pass, zero based.
  * @format: stream format.
  */
 void snd_hda_codec_setup_stream(struct hda_codec *codec, hda_nid_t nid,
                                 u32 stream_tag,
                                 int channel_id, int format)
 {
         struct hda_codec *c;
         struct hda_cvt_setup *p;
         int type;
         int i;
 
         if (!nid)
                 return;
 
         codec_dbg(codec,
                   "hda_codec_setup_stream: NID=0x%x, stream=0x%x, channel=%d, format=0x%x\n",
                   nid, stream_tag, channel_id, format);
         p = get_hda_cvt_setup(codec, nid);
         if (!p)
                 return;
 
         if (codec->patch_ops.stream_pm)
                 codec->patch_ops.stream_pm(codec, nid, true);
         if (codec->pcm_format_first)
                 update_pcm_format(codec, p, nid, format);
         update_pcm_stream_id(codec, p, nid, stream_tag, channel_id);
         if (!codec->pcm_format_first)
                 update_pcm_format(codec, p, nid, format);
 
         p->active = 1;
         p->dirty = 0;
 
         /* make other inactive cvts with the same stream-tag dirty */
         type = get_wcaps_type(get_wcaps(codec, nid));
         list_for_each_codec(c, codec->bus) {
                 snd_array_for_each(&c->cvt_setups, i, p) {
                         if (!p->active && p->stream_tag == stream_tag &&
                             get_wcaps_type(get_wcaps(c, p->nid)) == type)
                                 p->dirty = 1;
                 }
         }
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_setup_stream);
 
 static void really_cleanup_stream(struct hda_codec *codec,
                                   struct hda_cvt_setup *q);
 
 /**
  * __snd_hda_codec_cleanup_stream - clean up the codec for closing
  * @codec: the CODEC to clean up
  * @nid: the NID to clean up
  * @do_now: really clean up the stream instead of clearing the active flag
  */
 void __snd_hda_codec_cleanup_stream(struct hda_codec *codec, hda_nid_t nid,
                                     int do_now)
 {
         struct hda_cvt_setup *p;
 
         if (!nid)
                 return;
 
         if (codec->no_sticky_stream)
                 do_now = 1;
 
         codec_dbg(codec, "hda_codec_cleanup_stream: NID=0x%x\n", nid);
         p = get_hda_cvt_setup(codec, nid);
         if (p) {
                 /* here we just clear the active flag when do_now isn't set;
                  * actual clean-ups will be done later in
                  * purify_inactive_streams() called from snd_hda_codec_prpapre()
                  */
                 if (do_now)
                         really_cleanup_stream(codec, p);
                 else
                         p->active = 0;
         }
 }
 EXPORT_SYMBOL_GPL(__snd_hda_codec_cleanup_stream);
 
 static void really_cleanup_stream(struct hda_codec *codec,
                                   struct hda_cvt_setup *q)
 {
         hda_nid_t nid = q->nid;
         if (q->stream_tag || q->channel_id)
                 snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_CHANNEL_STREAMID, 0);
         if (q->format_id)
                 snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_STREAM_FORMAT, 0
 );
         memset(q, 0, sizeof(*q));
         q->nid = nid;
         if (codec->patch_ops.stream_pm)
                 codec->patch_ops.stream_pm(codec, nid, false);
 }
 
 /* clean up the all conflicting obsolete streams */
 static void purify_inactive_streams(struct hda_codec *codec)
 {
         struct hda_codec *c;
         struct hda_cvt_setup *p;
         int i;
 
         list_for_each_codec(c, codec->bus) {
                 snd_array_for_each(&c->cvt_setups, i, p) {
                         if (p->dirty)
                                 really_cleanup_stream(c, p);
                 }
         }
 }
 
 /* clean up all streams; called from suspend */
 static void hda_cleanup_all_streams(struct hda_codec *codec)
 {
         struct hda_cvt_setup *p;
         int i;
 
         snd_array_for_each(&codec->cvt_setups, i, p) {
                 if (p->stream_tag)
                         really_cleanup_stream(codec, p);
         }
 }
 
 /*
  * amp access functions
  */
 
 /**
  * query_amp_caps - query AMP capabilities
  * @codec: the HD-auio codec
  * @nid: the NID to query
  * @direction: either #HDA_INPUT or #HDA_OUTPUT
  *
  * Query AMP capabilities for the given widget and direction.
  * Returns the obtained capability bits.
  *
  * When cap bits have been already read, this doesn't read again but
  * returns the cached value.
  */
 u32 query_amp_caps(struct hda_codec *codec, hda_nid_t nid, int direction)
 {
         if (!(get_wcaps(codec, nid) & AC_WCAP_AMP_OVRD))
                 nid = codec->core.afg;
         return snd_hda_param_read(codec, nid,
                                   direction == HDA_OUTPUT ?
                                   AC_PAR_AMP_OUT_CAP : AC_PAR_AMP_IN_CAP);
 }
 EXPORT_SYMBOL_GPL(query_amp_caps);
 
 /**
  * snd_hda_check_amp_caps - query AMP capabilities
  * @codec: the HD-audio codec
  * @nid: the NID to query
  * @dir: either #HDA_INPUT or #HDA_OUTPUT
  * @bits: bit mask to check the result
  *
  * Check whether the widget has the given amp capability for the direction.
  */
 bool snd_hda_check_amp_caps(struct hda_codec *codec, hda_nid_t nid,
                            int dir, unsigned int bits)
 {
         if (!nid)
                 return false;
         if (get_wcaps(codec, nid) & (1 << (dir + 1)))
                 if (query_amp_caps(codec, nid, dir) & bits)
                         return true;
         return false;
 }
 EXPORT_SYMBOL_GPL(snd_hda_check_amp_caps);
 
 /**
  * snd_hda_override_amp_caps - Override the AMP capabilities
  * @codec: the CODEC to clean up
  * @nid: the NID to clean up
  * @dir: either #HDA_INPUT or #HDA_OUTPUT
  * @caps: the capability bits to set
  *
  * Override the cached AMP caps bits value by the given one.
  * This function is useful if the driver needs to adjust the AMP ranges,
  * e.g. limit to 0dB, etc.
  *
  * Returns zero if successful or a negative error code.
  */
 int snd_hda_override_amp_caps(struct hda_codec *codec, hda_nid_t nid, int dir,
                               unsigned int caps)
 {
         unsigned int parm;
 
         snd_hda_override_wcaps(codec, nid,
                                get_wcaps(codec, nid) | AC_WCAP_AMP_OVRD);
         parm = dir == HDA_OUTPUT ? AC_PAR_AMP_OUT_CAP : AC_PAR_AMP_IN_CAP;
         return snd_hdac_override_parm(&codec->core, nid, parm, caps);
 }
 EXPORT_SYMBOL_GPL(snd_hda_override_amp_caps);
 
 static unsigned int encode_amp(struct hda_codec *codec, hda_nid_t nid,
                                int ch, int dir, int idx)
 {
         unsigned int cmd = snd_hdac_regmap_encode_amp(nid, ch, dir, idx);
 
         /* enable fake mute if no h/w mute but min=mute */
         if ((query_amp_caps(codec, nid, dir) &
              (AC_AMPCAP_MUTE | AC_AMPCAP_MIN_MUTE)) == AC_AMPCAP_MIN_MUTE)
                 cmd |= AC_AMP_FAKE_MUTE;
         return cmd;
 }
 
 /**
  * snd_hda_codec_amp_update - update the AMP mono value
  * @codec: HD-audio codec
  * @nid: NID to read the AMP value
  * @ch: channel to update (0 or 1)
  * @dir: #HDA_INPUT or #HDA_OUTPUT
  * @idx: the index value (only for input direction)
  * @mask: bit mask to set
  * @val: the bits value to set
  *
  * Update the AMP values for the given channel, direction and index.
  */
 int snd_hda_codec_amp_update(struct hda_codec *codec, hda_nid_t nid,
                              int ch, int dir, int idx, int mask, int val)
 {
         unsigned int cmd = encode_amp(codec, nid, ch, dir, idx);
 
         return snd_hdac_regmap_update_raw(&codec->core, cmd, mask, val);
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_amp_update);
 
 /**
  * snd_hda_codec_amp_stereo - update the AMP stereo values
  * @codec: HD-audio codec
  * @nid: NID to read the AMP value
  * @direction: #HDA_INPUT or #HDA_OUTPUT
  * @idx: the index value (only for input direction)
  * @mask: bit mask to set
  * @val: the bits value to set
  *
  * Update the AMP values like snd_hda_codec_amp_update(), but for a
  * stereo widget with the same mask and value.
  */
 int snd_hda_codec_amp_stereo(struct hda_codec *codec, hda_nid_t nid,
                              int direction, int idx, int mask, int val)
 {
         int ch, ret = 0;
 
         if (snd_BUG_ON(mask & ~0xff))
                 mask &= 0xff;
         for (ch = 0; ch < 2; ch++)
                 ret |= snd_hda_codec_amp_update(codec, nid, ch, direction,
                                                 idx, mask, val);
         return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_amp_stereo);
 
 /**
  * snd_hda_codec_amp_init - initialize the AMP value
  * @codec: the HDA codec
  * @nid: NID to read the AMP value
  * @ch: channel (left=0 or right=1)
  * @dir: #HDA_INPUT or #HDA_OUTPUT
  * @idx: the index value (only for input direction)
  * @mask: bit mask to set
  * @val: the bits value to set
  *
  * Works like snd_hda_codec_amp_update() but it writes the value only at
  * the first access.  If the amp was already initialized / updated beforehand,
  * this does nothing.
  */
 int snd_hda_codec_amp_init(struct hda_codec *codec, hda_nid_t nid, int ch,
                            int dir, int idx, int mask, int val)
 {
         unsigned int cmd = encode_amp(codec, nid, ch, dir, idx);
 
         if (!codec->core.regmap)
                 return -EINVAL;
         return snd_hdac_regmap_update_raw_once(&codec->core, cmd, mask, val);
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_amp_init);
 
 /**
  * snd_hda_codec_amp_init_stereo - initialize the stereo AMP value
  * @codec: the HDA codec
  * @nid: NID to read the AMP value
  * @dir: #HDA_INPUT or #HDA_OUTPUT
  * @idx: the index value (only for input direction)
  * @mask: bit mask to set
  * @val: the bits value to set
  *
  * Call snd_hda_codec_amp_init() for both stereo channels.
  */
 int snd_hda_codec_amp_init_stereo(struct hda_codec *codec, hda_nid_t nid,
                                   int dir, int idx, int mask, int val)
 {
         int ch, ret = 0;
 
         if (snd_BUG_ON(mask & ~0xff))
                 mask &= 0xff;
         for (ch = 0; ch < 2; ch++)
                 ret |= snd_hda_codec_amp_init(codec, nid, ch, dir,
                                               idx, mask, val);
         return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_amp_init_stereo);
 
 static u32 get_amp_max_value(struct hda_codec *codec, hda_nid_t nid, int dir,
                              unsigned int ofs)
 {
         u32 caps = query_amp_caps(codec, nid, dir);
         /* get num steps */
         caps = (caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
         if (ofs < caps)
                 caps -= ofs;
         return caps;
 }
 
 /**
  * snd_hda_mixer_amp_volume_info - Info callback for a standard AMP mixer
  * @kcontrol: referred ctl element
  * @uinfo: pointer to get/store the data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_volume_info(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_info *uinfo)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         u16 nid = get_amp_nid(kcontrol);
         u8 chs = get_amp_channels(kcontrol);
         int dir = get_amp_direction(kcontrol);
         unsigned int ofs = get_amp_offset(kcontrol);
 
         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
         uinfo->count = chs == 3 ? 2 : 1;
         uinfo->value.integer.min = 0;
         uinfo->value.integer.max = get_amp_max_value(codec, nid, dir, ofs);
         if (!uinfo->value.integer.max) {
                 codec_warn(codec,
                            "num_steps = 0 for NID=0x%x (ctl = %s)\n",
                            nid, kcontrol->id.name);
                 return -EINVAL;
         }
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_volume_info);
 
 
 static inline unsigned int
 read_amp_value(struct hda_codec *codec, hda_nid_t nid,
                int ch, int dir, int idx, unsigned int ofs)
 {
         unsigned int val;
         val = snd_hda_codec_amp_read(codec, nid, ch, dir, idx);
         val &= HDA_AMP_VOLMASK;
         if (val >= ofs)
                 val -= ofs;
         else
                 val = 0;
         return val;
 }
 
 static inline int
 update_amp_value(struct hda_codec *codec, hda_nid_t nid,
                  int ch, int dir, int idx, unsigned int ofs,
                  unsigned int val)
 {
         unsigned int maxval;
 
         if (val > 0)
                 val += ofs;
         /* ofs = 0: raw max value */
         maxval = get_amp_max_value(codec, nid, dir, 0);
         if (val > maxval)
                 return -EINVAL;
         return snd_hda_codec_amp_update(codec, nid, ch, dir, idx,
                                         HDA_AMP_VOLMASK, val);
 }
 
 /**
  * snd_hda_mixer_amp_volume_get - Get callback for a standard AMP mixer volume
  * @kcontrol: ctl element
  * @ucontrol: pointer to get/store the data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_volume_get(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = get_amp_nid(kcontrol);
         int chs = get_amp_channels(kcontrol);
         int dir = get_amp_direction(kcontrol);
         int idx = get_amp_index(kcontrol);
         unsigned int ofs = get_amp_offset(kcontrol);
         long *valp = ucontrol->value.integer.value;
 
         if (chs & 1)
                 *valp++ = read_amp_value(codec, nid, 0, dir, idx, ofs);
         if (chs & 2)
                 *valp = read_amp_value(codec, nid, 1, dir, idx, ofs);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_volume_get);
 
 /**
  * snd_hda_mixer_amp_volume_put - Put callback for a standard AMP mixer volume
  * @kcontrol: ctl element
  * @ucontrol: pointer to get/store the data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_volume_put(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = get_amp_nid(kcontrol);
         int chs = get_amp_channels(kcontrol);
         int dir = get_amp_direction(kcontrol);
         int idx = get_amp_index(kcontrol);
         unsigned int ofs = get_amp_offset(kcontrol);
         long *valp = ucontrol->value.integer.value;
         int change = 0;
         int err;
 
         if (chs & 1) {
                 err = update_amp_value(codec, nid, 0, dir, idx, ofs, *valp);
                 if (err < 0)
                         return err;
                 change |= err;
                 valp++;
         }
         if (chs & 2) {
                 err = update_amp_value(codec, nid, 1, dir, idx, ofs, *valp);
                 if (err < 0)
                         return err;
                 change |= err;
         }
         return change;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_volume_put);
 
 /* inquiry the amp caps and convert to TLV */
 static void get_ctl_amp_tlv(struct snd_kcontrol *kcontrol, unsigned int *tlv)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = get_amp_nid(kcontrol);
         int dir = get_amp_direction(kcontrol);
         unsigned int ofs = get_amp_offset(kcontrol);
         bool min_mute = get_amp_min_mute(kcontrol);
         u32 caps, val1, val2;
 
         caps = query_amp_caps(codec, nid, dir);
         val2 = (caps & AC_AMPCAP_STEP_SIZE) >> AC_AMPCAP_STEP_SIZE_SHIFT;
         val2 = (val2 + 1) * 25;
         val1 = -((caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT);
         val1 += ofs;
         val1 = ((int)val1) * ((int)val2);
         if (min_mute || (caps & AC_AMPCAP_MIN_MUTE))
                 val2 |= TLV_DB_SCALE_MUTE;
         tlv[SNDRV_CTL_TLVO_TYPE] = SNDRV_CTL_TLVT_DB_SCALE;
         tlv[SNDRV_CTL_TLVO_LEN] = 2 * sizeof(unsigned int);
         tlv[SNDRV_CTL_TLVO_DB_SCALE_MIN] = val1;
         tlv[SNDRV_CTL_TLVO_DB_SCALE_MUTE_AND_STEP] = val2;
 }
 
 /**
  * snd_hda_mixer_amp_tlv - TLV callback for a standard AMP mixer volume
  * @kcontrol: ctl element
  * @op_flag: operation flag
  * @size: byte size of input TLV
  * @_tlv: TLV data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag,
                           unsigned int size, unsigned int __user *_tlv)
 {
         unsigned int tlv[4];
 
         if (size < 4 * sizeof(unsigned int))
                 return -ENOMEM;
         get_ctl_amp_tlv(kcontrol, tlv);
         if (copy_to_user(_tlv, tlv, sizeof(tlv)))
                 return -EFAULT;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_tlv);
 
 /**
  * snd_hda_set_vmaster_tlv - Set TLV for a virtual master control
  * @codec: HD-audio codec
  * @nid: NID of a reference widget
  * @dir: #HDA_INPUT or #HDA_OUTPUT
  * @tlv: TLV data to be stored, at least 4 elements
  *
  * Set (static) TLV data for a virtual master volume using the AMP caps
  * obtained from the reference NID.
  * The volume range is recalculated as if the max volume is 0dB.
  */
 void snd_hda_set_vmaster_tlv(struct hda_codec *codec, hda_nid_t nid, int dir,
                              unsigned int *tlv)
 {
         u32 caps;
         int nums, step;
 
         caps = query_amp_caps(codec, nid, dir);
         nums = (caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
         step = (caps & AC_AMPCAP_STEP_SIZE) >> AC_AMPCAP_STEP_SIZE_SHIFT;
         step = (step + 1) * 25;
         tlv[SNDRV_CTL_TLVO_TYPE] = SNDRV_CTL_TLVT_DB_SCALE;
         tlv[SNDRV_CTL_TLVO_LEN] = 2 * sizeof(unsigned int);
         tlv[SNDRV_CTL_TLVO_DB_SCALE_MIN] = -nums * step;
         tlv[SNDRV_CTL_TLVO_DB_SCALE_MUTE_AND_STEP] = step;
 }
 EXPORT_SYMBOL_GPL(snd_hda_set_vmaster_tlv);
 
 /* find a mixer control element with the given name */
 static struct snd_kcontrol *
 find_mixer_ctl(struct hda_codec *codec, const char *name, int dev, int idx)
 {
         struct snd_ctl_elem_id id;
         memset(&id, 0, sizeof(id));
         id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
         id.device = dev;
         id.index = idx;
         if (snd_BUG_ON(strlen(name) >= sizeof(id.name)))
                 return NULL;
         strcpy(id.name, name);
         return snd_ctl_find_id(codec->card, &id);
 }
 
 /**
  * snd_hda_find_mixer_ctl - Find a mixer control element with the given name
  * @codec: HD-audio codec
  * @name: ctl id name string
  *
  * Get the control element with the given id string and IFACE_MIXER.
  */
 struct snd_kcontrol *snd_hda_find_mixer_ctl(struct hda_codec *codec,
                                             const char *name)
 {
         return find_mixer_ctl(codec, name, 0, 0);
 }
 EXPORT_SYMBOL_GPL(snd_hda_find_mixer_ctl);
 
 static int find_empty_mixer_ctl_idx(struct hda_codec *codec, const char *name,
                                     int start_idx)
 {
         int i, idx;
         /* 16 ctlrs should be large enough */
         for (i = 0, idx = start_idx; i < 16; i++, idx++) {
                 if (!find_mixer_ctl(codec, name, 0, idx))
                         return idx;
         }
         return -EBUSY;
 }
 
 /**
  * snd_hda_ctl_add - Add a control element and assign to the codec
  * @codec: HD-audio codec
  * @nid: corresponding NID (optional)
  * @kctl: the control element to assign
  *
  * Add the given control element to an array inside the codec instance.
  * All control elements belonging to a codec are supposed to be added
  * by this function so that a proper clean-up works at the free or
  * reconfiguration time.
  *
  * If non-zero @nid is passed, the NID is assigned to the control element.
  * The assignment is shown in the codec proc file.
  *
  * snd_hda_ctl_add() checks the control subdev id field whether
  * #HDA_SUBDEV_NID_FLAG bit is set.  If set (and @nid is zero), the lower
  * bits value is taken as the NID to assign. The #HDA_NID_ITEM_AMP bit
  * specifies if kctl->private_value is a HDA amplifier value.
  */
 int snd_hda_ctl_add(struct hda_codec *codec, hda_nid_t nid,
                     struct snd_kcontrol *kctl)
 {
         int err;
         unsigned short flags = 0;
         struct hda_nid_item *item;
 
         if (kctl->id.subdevice & HDA_SUBDEV_AMP_FLAG) {
                 flags |= HDA_NID_ITEM_AMP;
                 if (nid == 0)
                         nid = get_amp_nid_(kctl->private_value);
         }
         if ((kctl->id.subdevice & HDA_SUBDEV_NID_FLAG) != 0 && nid == 0)
                 nid = kctl->id.subdevice & 0xffff;
         if (kctl->id.subdevice & (HDA_SUBDEV_NID_FLAG|HDA_SUBDEV_AMP_FLAG))
                 kctl->id.subdevice = 0;
         err = snd_ctl_add(codec->card, kctl);
         if (err < 0)
                 return err;
         item = snd_array_new(&codec->mixers);
         if (!item)
                 return -ENOMEM;
         item->kctl = kctl;
         item->nid = nid;
         item->flags = flags;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_ctl_add);
 
 /**
  * snd_hda_add_nid - Assign a NID to a control element
  * @codec: HD-audio codec
  * @nid: corresponding NID (optional)
  * @kctl: the control element to assign
  * @index: index to kctl
  *
  * Add the given control element to an array inside the codec instance.
  * This function is used when #snd_hda_ctl_add cannot be used for 1:1
  * NID:KCTL mapping - for example "Capture Source" selector.
  */
 int snd_hda_add_nid(struct hda_codec *codec, struct snd_kcontrol *kctl,
                     unsigned int index, hda_nid_t nid)
 {
         struct hda_nid_item *item;
 
         if (nid > 0) {
                 item = snd_array_new(&codec->nids);
                 if (!item)
                         return -ENOMEM;
                 item->kctl = kctl;
                 item->index = index;
                 item->nid = nid;
                 return 0;
         }
         codec_err(codec, "no NID for mapping control %s:%d:%d\n",
                   kctl->id.name, kctl->id.index, index);
         return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(snd_hda_add_nid);
 
 /**
  * snd_hda_ctls_clear - Clear all controls assigned to the given codec
  * @codec: HD-audio codec
  */
 void snd_hda_ctls_clear(struct hda_codec *codec)
 {
         int i;
         struct hda_nid_item *items = codec->mixers.list;
 
         for (i = 0; i < codec->mixers.used; i++)
                 snd_ctl_remove(codec->card, items[i].kctl);
         snd_array_free(&codec->mixers);
         snd_array_free(&codec->nids);
 }
 
 /**
  * snd_hda_lock_devices - pseudo device locking
  * @bus: the BUS
  *
  * toggle card->shutdown to allow/disallow the device access (as a hack)
  */
 int snd_hda_lock_devices(struct hda_bus *bus)
 {
         struct snd_card *card = bus->card;
         struct hda_codec *codec;
 
         spin_lock(&card->files_lock);
         if (card->shutdown)
                 goto err_unlock;
         card->shutdown = 1;
         if (!list_empty(&card->ctl_files))
                 goto err_clear;
 
         list_for_each_codec(codec, bus) {
                 struct hda_pcm *cpcm;
                 list_for_each_entry(cpcm, &codec->pcm_list_head, list) {
                         if (!cpcm->pcm)
                                 continue;
                         if (cpcm->pcm->streams[0].substream_opened ||
                             cpcm->pcm->streams[1].substream_opened)
                                 goto err_clear;
                 }
         }
         spin_unlock(&card->files_lock);
         return 0;
 
  err_clear:
         card->shutdown = 0;
  err_unlock:
         spin_unlock(&card->files_lock);
         return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(snd_hda_lock_devices);
 
 /**
  * snd_hda_unlock_devices - pseudo device unlocking
  * @bus: the BUS
  */
 void snd_hda_unlock_devices(struct hda_bus *bus)
 {
         struct snd_card *card = bus->card;
 
         spin_lock(&card->files_lock);
         card->shutdown = 0;
         spin_unlock(&card->files_lock);
 }
 EXPORT_SYMBOL_GPL(snd_hda_unlock_devices);
 
 /**
  * snd_hda_codec_reset - Clear all objects assigned to the codec
  * @codec: HD-audio codec
  *
  * This frees the all PCM and control elements assigned to the codec, and
  * clears the caches and restores the pin default configurations.
  *
  * When a device is being used, it returns -EBSY.  If successfully freed,
  * returns zero.
  */
 int snd_hda_codec_reset(struct hda_codec *codec)
 {
         struct hda_bus *bus = codec->bus;
 
         if (snd_hda_lock_devices(bus) < 0)
                 return -EBUSY;
 
         /* OK, let it free */
         device_release_driver(hda_codec_dev(codec));
 
         /* allow device access again */
         snd_hda_unlock_devices(bus);
         return 0;
 }
 
 typedef int (*map_follower_func_t)(struct hda_codec *, void *, struct snd_kcontrol *);
 
 /* apply the function to all matching follower ctls in the mixer list */
 static int map_followers(struct hda_codec *codec, const char * const *followers,
                          const char *suffix, map_follower_func_t func, void *data)
 {
         struct hda_nid_item *items;
         const char * const *s;
         int i, err;
 
         items = codec->mixers.list;
         for (i = 0; i < codec->mixers.used; i++) {
                 struct snd_kcontrol *sctl = items[i].kctl;
                 if (!sctl || sctl->id.iface != SNDRV_CTL_ELEM_IFACE_MIXER)
                         continue;
                 for (s = followers; *s; s++) {
                         char tmpname[sizeof(sctl->id.name)];
                         const char *name = *s;
                         if (suffix) {
                                 snprintf(tmpname, sizeof(tmpname), "%s %s",
                                          name, suffix);
                                 name = tmpname;
                         }
                         if (!strcmp(sctl->id.name, name)) {
                                 err = func(codec, data, sctl);
                                 if (err)
                                         return err;
                                 break;
                         }
                 }
         }
         return 0;
 }
 
 static int check_follower_present(struct hda_codec *codec,
                                   void *data, struct snd_kcontrol *sctl)
 {
         return 1;
 }
 
 /* call kctl->put with the given value(s) */
 static int put_kctl_with_value(struct snd_kcontrol *kctl, int val)
 {
         struct snd_ctl_elem_value *ucontrol;
         ucontrol = kzalloc(sizeof(*ucontrol), GFP_KERNEL);
         if (!ucontrol)
                 return -ENOMEM;
         ucontrol->value.integer.value[0] = val;
         ucontrol->value.integer.value[1] = val;
         kctl->put(kctl, ucontrol);
         kfree(ucontrol);
         return 0;
 }
 
 struct follower_init_arg {
         struct hda_codec *codec;
         int step;
 };
 
 /* initialize the follower volume with 0dB via snd_ctl_apply_vmaster_followers() */
 static int init_follower_0dB(struct snd_kcontrol *follower,
                              struct snd_kcontrol *kctl,
                              void *_arg)
 {
         struct follower_init_arg *arg = _arg;
         int _tlv[4];
         const int *tlv = NULL;
         int step;
         int val;
 
         if (kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
                 if (kctl->tlv.c != snd_hda_mixer_amp_tlv) {
                         codec_err(arg->codec,
                                   "Unexpected TLV callback for follower %s:%d\n",
                                   kctl->id.name, kctl->id.index);
                         return 0; /* ignore */
                 }
                 get_ctl_amp_tlv(kctl, _tlv);
                 tlv = _tlv;
         } else if (kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)
                 tlv = kctl->tlv.p;
 
         if (!tlv || tlv[SNDRV_CTL_TLVO_TYPE] != SNDRV_CTL_TLVT_DB_SCALE)
                 return 0;
 
         step = tlv[SNDRV_CTL_TLVO_DB_SCALE_MUTE_AND_STEP];
         step &= ~TLV_DB_SCALE_MUTE;
         if (!step)
                 return 0;
         if (arg->step && arg->step != step) {
                 codec_err(arg->codec,
                           "Mismatching dB step for vmaster follower (%d!=%d)\n",
                           arg->step, step);
                 return 0;
         }
 
         arg->step = step;
         val = -tlv[SNDRV_CTL_TLVO_DB_SCALE_MIN] / step;
         if (val > 0) {
                 put_kctl_with_value(follower, val);
                 return val;
         }
 
         return 0;
 }
 
 /* unmute the follower via snd_ctl_apply_vmaster_followers() */
 static int init_follower_unmute(struct snd_kcontrol *follower,
                                 struct snd_kcontrol *kctl,
                                 void *_arg)
 {
         return put_kctl_with_value(follower, 1);
 }
 
 static int add_follower(struct hda_codec *codec,
                         void *data, struct snd_kcontrol *follower)
 {
         return snd_ctl_add_follower(data, follower);
 }
 
 /**
  * __snd_hda_add_vmaster - create a virtual master control and add followers
  * @codec: HD-audio codec
  * @name: vmaster control name
  * @tlv: TLV data (optional)
  * @followers: follower control names (optional)
  * @suffix: suffix string to each follower name (optional)
  * @init_follower_vol: initialize followers to unmute/0dB
  * @access: kcontrol access rights
  * @ctl_ret: store the vmaster kcontrol in return
  *
  * Create a virtual master control with the given name.  The TLV data
  * must be either NULL or a valid data.
  *
  * @followers is a NULL-terminated array of strings, each of which is a
  * follower control name.  All controls with these names are assigned to
  * the new virtual master control.
  *
  * This function returns zero if successful or a negative error code.
  */
 int __snd_hda_add_vmaster(struct hda_codec *codec, char *name,
                           unsigned int *tlv, const char * const *followers,
                           const char *suffix, bool init_follower_vol,
                           unsigned int access, struct snd_kcontrol **ctl_ret)
 {
         struct snd_kcontrol *kctl;
         int err;
 
         if (ctl_ret)
                 *ctl_ret = NULL;
 
         err = map_followers(codec, followers, suffix, check_follower_present, NULL);
         if (err != 1) {
                 codec_dbg(codec, "No follower found for %s\n", name);
                 return 0;
         }
         kctl = snd_ctl_make_virtual_master(name, tlv);
         if (!kctl)
                 return -ENOMEM;
         kctl->vd[0].access |= access;
         err = snd_hda_ctl_add(codec, 0, kctl);
         if (err < 0)
                 return err;
 
         err = map_followers(codec, followers, suffix, add_follower, kctl);
         if (err < 0)
                 return err;
 
         /* init with master mute & zero volume */
         put_kctl_with_value(kctl, 0);
         if (init_follower_vol) {
                 struct follower_init_arg arg = {
                         .codec = codec,
                         .step = 0,
                 };
                 snd_ctl_apply_vmaster_followers(kctl,
                                                 tlv ? init_follower_0dB : init_follower_unmute,
                                                 &arg);
         }
 
         if (ctl_ret)
                 *ctl_ret = kctl;
         return 0;
 }
 EXPORT_SYMBOL_GPL(__snd_hda_add_vmaster);
 
 /* meta hook to call each driver's vmaster hook */
 static void vmaster_hook(void *private_data, int enabled)
 {
         struct hda_vmaster_mute_hook *hook = private_data;
 
         hook->hook(hook->codec, enabled);
 }
 
 /**
  * snd_hda_add_vmaster_hook - Add a vmaster hw specific hook
  * @codec: the HDA codec
  * @hook: the vmaster hook object
  *
  * Add a hw specific hook (like EAPD) with the given vmaster switch kctl.
  */
 int snd_hda_add_vmaster_hook(struct hda_codec *codec,
                              struct hda_vmaster_mute_hook *hook)
 {
         if (!hook->hook || !hook->sw_kctl)
                 return 0;
         hook->codec = codec;
         snd_ctl_add_vmaster_hook(hook->sw_kctl, vmaster_hook, hook);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_add_vmaster_hook);
 
 /**
  * snd_hda_sync_vmaster_hook - Sync vmaster hook
  * @hook: the vmaster hook
  *
  * Call the hook with the current value for synchronization.
  * Should be called in init callback.
  */
 void snd_hda_sync_vmaster_hook(struct hda_vmaster_mute_hook *hook)
 {
         if (!hook->hook || !hook->codec)
                 return;
         /* don't call vmaster hook in the destructor since it might have
          * been already destroyed
          */
         if (hook->codec->bus->shutdown)
                 return;
         snd_ctl_sync_vmaster_hook(hook->sw_kctl);
 }
 EXPORT_SYMBOL_GPL(snd_hda_sync_vmaster_hook);
 
 
 /**
  * snd_hda_mixer_amp_switch_info - Info callback for a standard AMP mixer switch
  * @kcontrol: referred ctl element
  * @uinfo: pointer to get/store the data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_switch_info(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_info *uinfo)
 {
         int chs = get_amp_channels(kcontrol);
 
         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
         uinfo->count = chs == 3 ? 2 : 1;
         uinfo->value.integer.min = 0;
         uinfo->value.integer.max = 1;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_info);
 
 /**
  * snd_hda_mixer_amp_switch_get - Get callback for a standard AMP mixer switch
  * @kcontrol: ctl element
  * @ucontrol: pointer to get/store the data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_switch_get(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = get_amp_nid(kcontrol);
         int chs = get_amp_channels(kcontrol);
         int dir = get_amp_direction(kcontrol);
         int idx = get_amp_index(kcontrol);
         long *valp = ucontrol->value.integer.value;
 
         if (chs & 1)
                 *valp++ = (snd_hda_codec_amp_read(codec, nid, 0, dir, idx) &
                            HDA_AMP_MUTE) ? 0 : 1;
         if (chs & 2)
                 *valp = (snd_hda_codec_amp_read(codec, nid, 1, dir, idx) &
                          HDA_AMP_MUTE) ? 0 : 1;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get);
 
 /**
  * snd_hda_mixer_amp_switch_put - Put callback for a standard AMP mixer switch
  * @kcontrol: ctl element
  * @ucontrol: pointer to get/store the data
  *
  * The control element is supposed to have the private_value field
  * set up via HDA_COMPOSE_AMP_VAL*() or related macros.
  */
 int snd_hda_mixer_amp_switch_put(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = get_amp_nid(kcontrol);
         int chs = get_amp_channels(kcontrol);
         int dir = get_amp_direction(kcontrol);
         int idx = get_amp_index(kcontrol);
         long *valp = ucontrol->value.integer.value;
         int change = 0;
 
         if (chs & 1) {
                 if (*valp < 0 || *valp > 1)
                         return -EINVAL;
                 change = snd_hda_codec_amp_update(codec, nid, 0, dir, idx,
                                                   HDA_AMP_MUTE,
                                                   *valp ? 0 : HDA_AMP_MUTE);
                 valp++;
         }
         if (chs & 2) {
                 if (*valp < 0 || *valp > 1)
                         return -EINVAL;
                 change |= snd_hda_codec_amp_update(codec, nid, 1, dir, idx,
                                                    HDA_AMP_MUTE,
                                                    *valp ? 0 : HDA_AMP_MUTE);
         }
         hda_call_check_power_status(codec, nid);
         return change;
 }
 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put);
 
 /*
  * SPDIF out controls
  */
 
 static int snd_hda_spdif_mask_info(struct snd_kcontrol *kcontrol,
                                    struct snd_ctl_elem_info *uinfo)
 {
         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
         uinfo->count = 1;
         return 0;
 }
 
 static int snd_hda_spdif_cmask_get(struct snd_kcontrol *kcontrol,
                                    struct snd_ctl_elem_value *ucontrol)
 {
         ucontrol->value.iec958.status[0] = IEC958_AES0_PROFESSIONAL |
                                            IEC958_AES0_NONAUDIO |
                                            IEC958_AES0_CON_EMPHASIS_5015 |
                                            IEC958_AES0_CON_NOT_COPYRIGHT;
         ucontrol->value.iec958.status[1] = IEC958_AES1_CON_CATEGORY |
                                            IEC958_AES1_CON_ORIGINAL;
         return 0;
 }
 
 static int snd_hda_spdif_pmask_get(struct snd_kcontrol *kcontrol,
                                    struct snd_ctl_elem_value *ucontrol)
 {
         ucontrol->value.iec958.status[0] = IEC958_AES0_PROFESSIONAL |
                                            IEC958_AES0_NONAUDIO |
                                            IEC958_AES0_PRO_EMPHASIS_5015;
         return 0;
 }
 
 static int snd_hda_spdif_default_get(struct snd_kcontrol *kcontrol,
                                      struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         int idx = kcontrol->private_value;
         struct hda_spdif_out *spdif;
 
         if (WARN_ON(codec->spdif_out.used <= idx))
                 return -EINVAL;
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_array_elem(&codec->spdif_out, idx);
         ucontrol->value.iec958.status[0] = spdif->status & 0xff;
         ucontrol->value.iec958.status[1] = (spdif->status >> 8) & 0xff;
         ucontrol->value.iec958.status[2] = (spdif->status >> 16) & 0xff;
         ucontrol->value.iec958.status[3] = (spdif->status >> 24) & 0xff;
         mutex_unlock(&codec->spdif_mutex);
 
         return 0;
 }
 
 /* convert from SPDIF status bits to HDA SPDIF bits
  * bit 0 (DigEn) is always set zero (to be filled later)
  */
 static unsigned short convert_from_spdif_status(unsigned int sbits)
 {
         unsigned short val = 0;
 
         if (sbits & IEC958_AES0_PROFESSIONAL)
                 val |= AC_DIG1_PROFESSIONAL;
         if (sbits & IEC958_AES0_NONAUDIO)
                 val |= AC_DIG1_NONAUDIO;
         if (sbits & IEC958_AES0_PROFESSIONAL) {
                 if ((sbits & IEC958_AES0_PRO_EMPHASIS) ==
                     IEC958_AES0_PRO_EMPHASIS_5015)
                         val |= AC_DIG1_EMPHASIS;
         } else {
                 if ((sbits & IEC958_AES0_CON_EMPHASIS) ==
                     IEC958_AES0_CON_EMPHASIS_5015)
                         val |= AC_DIG1_EMPHASIS;
                 if (!(sbits & IEC958_AES0_CON_NOT_COPYRIGHT))
                         val |= AC_DIG1_COPYRIGHT;
                 if (sbits & (IEC958_AES1_CON_ORIGINAL << 8))
                         val |= AC_DIG1_LEVEL;
                 val |= sbits & (IEC958_AES1_CON_CATEGORY << 8);
         }
         return val;
 }
 
 /* convert to SPDIF status bits from HDA SPDIF bits
  */
 static unsigned int convert_to_spdif_status(unsigned short val)
 {
         unsigned int sbits = 0;
 
         if (val & AC_DIG1_NONAUDIO)
                 sbits |= IEC958_AES0_NONAUDIO;
         if (val & AC_DIG1_PROFESSIONAL)
                 sbits |= IEC958_AES0_PROFESSIONAL;
         if (sbits & IEC958_AES0_PROFESSIONAL) {
                 if (val & AC_DIG1_EMPHASIS)
                         sbits |= IEC958_AES0_PRO_EMPHASIS_5015;
         } else {
                 if (val & AC_DIG1_EMPHASIS)
                         sbits |= IEC958_AES0_CON_EMPHASIS_5015;
                 if (!(val & AC_DIG1_COPYRIGHT))
                         sbits |= IEC958_AES0_CON_NOT_COPYRIGHT;
                 if (val & AC_DIG1_LEVEL)
                         sbits |= (IEC958_AES1_CON_ORIGINAL << 8);
                 sbits |= val & (0x7f << 8);
         }
         return sbits;
 }
 
 /* set digital convert verbs both for the given NID and its followers */
 static void set_dig_out(struct hda_codec *codec, hda_nid_t nid,
                         int mask, int val)
 {
         const hda_nid_t *d;
 
         snd_hdac_regmap_update(&codec->core, nid, AC_VERB_SET_DIGI_CONVERT_1,
                                mask, val);
         d = codec->follower_dig_outs;
         if (!d)
                 return;
         for (; *d; d++)
                 snd_hdac_regmap_update(&codec->core, *d,
                                        AC_VERB_SET_DIGI_CONVERT_1, mask, val);
 }
 
 static inline void set_dig_out_convert(struct hda_codec *codec, hda_nid_t nid,
                                        int dig1, int dig2)
 {
         unsigned int mask = 0;
         unsigned int val = 0;
 
         if (dig1 != -1) {
                 mask |= 0xff;
                 val = dig1;
         }
         if (dig2 != -1) {
                 mask |= 0xff00;
                 val |= dig2 << 8;
         }
         set_dig_out(codec, nid, mask, val);
 }
 
 static int snd_hda_spdif_default_put(struct snd_kcontrol *kcontrol,
                                      struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         int idx = kcontrol->private_value;
         struct hda_spdif_out *spdif;
         hda_nid_t nid;
         unsigned short val;
         int change;
 
         if (WARN_ON(codec->spdif_out.used <= idx))
                 return -EINVAL;
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_array_elem(&codec->spdif_out, idx);
         nid = spdif->nid;
         spdif->status = ucontrol->value.iec958.status[0] |
                 ((unsigned int)ucontrol->value.iec958.status[1] << 8) |
                 ((unsigned int)ucontrol->value.iec958.status[2] << 16) |
                 ((unsigned int)ucontrol->value.iec958.status[3] << 24);
         val = convert_from_spdif_status(spdif->status);
         val |= spdif->ctls & 1;
         change = spdif->ctls != val;
         spdif->ctls = val;
         if (change && nid != (u16)-1)
                 set_dig_out_convert(codec, nid, val & 0xff, (val >> 8) & 0xff);
         mutex_unlock(&codec->spdif_mutex);
         return change;
 }
 
 #define snd_hda_spdif_out_switch_info   snd_ctl_boolean_mono_info
 
 static int snd_hda_spdif_out_switch_get(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         int idx = kcontrol->private_value;
         struct hda_spdif_out *spdif;
 
         if (WARN_ON(codec->spdif_out.used <= idx))
                 return -EINVAL;
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_array_elem(&codec->spdif_out, idx);
         ucontrol->value.integer.value[0] = spdif->ctls & AC_DIG1_ENABLE;
         mutex_unlock(&codec->spdif_mutex);
         return 0;
 }
 
 static inline void set_spdif_ctls(struct hda_codec *codec, hda_nid_t nid,
                                   int dig1, int dig2)
 {
         set_dig_out_convert(codec, nid, dig1, dig2);
         /* unmute amp switch (if any) */
         if ((get_wcaps(codec, nid) & AC_WCAP_OUT_AMP) &&
             (dig1 & AC_DIG1_ENABLE))
                 snd_hda_codec_amp_stereo(codec, nid, HDA_OUTPUT, 0,
                                             HDA_AMP_MUTE, 0);
 }
 
 static int snd_hda_spdif_out_switch_put(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         int idx = kcontrol->private_value;
         struct hda_spdif_out *spdif;
         hda_nid_t nid;
         unsigned short val;
         int change;
 
         if (WARN_ON(codec->spdif_out.used <= idx))
                 return -EINVAL;
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_array_elem(&codec->spdif_out, idx);
         nid = spdif->nid;
         val = spdif->ctls & ~AC_DIG1_ENABLE;
         if (ucontrol->value.integer.value[0])
                 val |= AC_DIG1_ENABLE;
         change = spdif->ctls != val;
         spdif->ctls = val;
         if (change && nid != (u16)-1)
                 set_spdif_ctls(codec, nid, val & 0xff, -1);
         mutex_unlock(&codec->spdif_mutex);
         return change;
 }
 
 static const struct snd_kcontrol_new dig_mixes[] = {
         {
                 .access = SNDRV_CTL_ELEM_ACCESS_READ,
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, CON_MASK),
                 .info = snd_hda_spdif_mask_info,
                 .get = snd_hda_spdif_cmask_get,
         },
         {
                 .access = SNDRV_CTL_ELEM_ACCESS_READ,
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, PRO_MASK),
                 .info = snd_hda_spdif_mask_info,
                 .get = snd_hda_spdif_pmask_get,
         },
         {
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
                 .info = snd_hda_spdif_mask_info,
                 .get = snd_hda_spdif_default_get,
                 .put = snd_hda_spdif_default_put,
         },
         {
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, SWITCH),
                 .info = snd_hda_spdif_out_switch_info,
                 .get = snd_hda_spdif_out_switch_get,
                 .put = snd_hda_spdif_out_switch_put,
         },
         { } /* end */
 };
 
 /**
  * snd_hda_create_dig_out_ctls - create Output SPDIF-related controls
  * @codec: the HDA codec
  * @associated_nid: NID that new ctls associated with
  * @cvt_nid: converter NID
  * @type: HDA_PCM_TYPE_*
  * Creates controls related with the digital output.
  * Called from each patch supporting the digital out.
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hda_create_dig_out_ctls(struct hda_codec *codec,
                                 hda_nid_t associated_nid,
                                 hda_nid_t cvt_nid,
                                 int type)
 {
         int err;
         struct snd_kcontrol *kctl;
         const struct snd_kcontrol_new *dig_mix;
         int idx = 0;
         int val = 0;
         const int spdif_index = 16;
         struct hda_spdif_out *spdif;
         struct hda_bus *bus = codec->bus;
 
         if (bus->primary_dig_out_type == HDA_PCM_TYPE_HDMI &&
             type == HDA_PCM_TYPE_SPDIF) {
                 idx = spdif_index;
         } else if (bus->primary_dig_out_type == HDA_PCM_TYPE_SPDIF &&
                    type == HDA_PCM_TYPE_HDMI) {
                 /* suppose a single SPDIF device */
                 for (dig_mix = dig_mixes; dig_mix->name; dig_mix++) {
                         struct snd_ctl_elem_id id;
 
                         kctl = find_mixer_ctl(codec, dig_mix->name, 0, 0);
                         if (!kctl)
                                 break;
                         id = kctl->id;
                         id.index = spdif_index;
                         snd_ctl_rename_id(codec->card, &kctl->id, &id);
                 }
                 bus->primary_dig_out_type = HDA_PCM_TYPE_HDMI;
         }
         if (!bus->primary_dig_out_type)
                 bus->primary_dig_out_type = type;
 
         idx = find_empty_mixer_ctl_idx(codec, "IEC958 Playback Switch", idx);
         if (idx < 0) {
                 codec_err(codec, "too many IEC958 outputs\n");
                 return -EBUSY;
         }
         spdif = snd_array_new(&codec->spdif_out);
         if (!spdif)
                 return -ENOMEM;
         for (dig_mix = dig_mixes; dig_mix->name; dig_mix++) {
                 kctl = snd_ctl_new1(dig_mix, codec);
                 if (!kctl)
                         return -ENOMEM;
                 kctl->id.index = idx;
                 kctl->private_value = codec->spdif_out.used - 1;
                 err = snd_hda_ctl_add(codec, associated_nid, kctl);
                 if (err < 0)
                         return err;
         }
         spdif->nid = cvt_nid;
         snd_hdac_regmap_read(&codec->core, cvt_nid,
                              AC_VERB_GET_DIGI_CONVERT_1, &val);
         spdif->ctls = val;
         spdif->status = convert_to_spdif_status(spdif->ctls);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_create_dig_out_ctls);
 
 /**
  * snd_hda_spdif_out_of_nid - get the hda_spdif_out entry from the given NID
  * @codec: the HDA codec
  * @nid: widget NID
  *
  * call within spdif_mutex lock
  */
 struct hda_spdif_out *snd_hda_spdif_out_of_nid(struct hda_codec *codec,
                                                hda_nid_t nid)
 {
         struct hda_spdif_out *spdif;
         int i;
 
         snd_array_for_each(&codec->spdif_out, i, spdif) {
                 if (spdif->nid == nid)
                         return spdif;
         }
         return NULL;
 }
 EXPORT_SYMBOL_GPL(snd_hda_spdif_out_of_nid);
 
 /**
  * snd_hda_spdif_ctls_unassign - Unassign the given SPDIF ctl
  * @codec: the HDA codec
  * @idx: the SPDIF ctl index
  *
  * Unassign the widget from the given SPDIF control.
  */
 void snd_hda_spdif_ctls_unassign(struct hda_codec *codec, int idx)
 {
         struct hda_spdif_out *spdif;
 
         if (WARN_ON(codec->spdif_out.used <= idx))
                 return;
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_array_elem(&codec->spdif_out, idx);
         spdif->nid = (u16)-1;
         mutex_unlock(&codec->spdif_mutex);
 }
 EXPORT_SYMBOL_GPL(snd_hda_spdif_ctls_unassign);
 
 /**
  * snd_hda_spdif_ctls_assign - Assign the SPDIF controls to the given NID
  * @codec: the HDA codec
  * @idx: the SPDIF ctl idx
  * @nid: widget NID
  *
  * Assign the widget to the SPDIF control with the given index.
  */
 void snd_hda_spdif_ctls_assign(struct hda_codec *codec, int idx, hda_nid_t nid)
 {
         struct hda_spdif_out *spdif;
         unsigned short val;
 
         if (WARN_ON(codec->spdif_out.used <= idx))
                 return;
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_array_elem(&codec->spdif_out, idx);
         if (spdif->nid != nid) {
                 spdif->nid = nid;
                 val = spdif->ctls;
                 set_spdif_ctls(codec, nid, val & 0xff, (val >> 8) & 0xff);
         }
         mutex_unlock(&codec->spdif_mutex);
 }
 EXPORT_SYMBOL_GPL(snd_hda_spdif_ctls_assign);
 
 /*
  * SPDIF sharing with analog output
  */
 static int spdif_share_sw_get(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_multi_out *mout = snd_kcontrol_chip(kcontrol);
         ucontrol->value.integer.value[0] = mout->share_spdif;
         return 0;
 }
 
 static int spdif_share_sw_put(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_multi_out *mout = snd_kcontrol_chip(kcontrol);
         mout->share_spdif = !!ucontrol->value.integer.value[0];
         return 0;
 }
 
 static const struct snd_kcontrol_new spdif_share_sw = {
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
         .name = "IEC958 Default PCM Playback Switch",
         .info = snd_ctl_boolean_mono_info,
         .get = spdif_share_sw_get,
         .put = spdif_share_sw_put,
 };
 
 /**
  * snd_hda_create_spdif_share_sw - create Default PCM switch
  * @codec: the HDA codec
  * @mout: multi-out instance
  */
 int snd_hda_create_spdif_share_sw(struct hda_codec *codec,
                                   struct hda_multi_out *mout)
 {
         struct snd_kcontrol *kctl;
 
         if (!mout->dig_out_nid)
                 return 0;
 
         kctl = snd_ctl_new1(&spdif_share_sw, mout);
         if (!kctl)
                 return -ENOMEM;
         /* ATTENTION: here mout is passed as private_data, instead of codec */
         return snd_hda_ctl_add(codec, mout->dig_out_nid, kctl);
 }
 EXPORT_SYMBOL_GPL(snd_hda_create_spdif_share_sw);
 
 /*
  * SPDIF input
  */
 
 #define snd_hda_spdif_in_switch_info    snd_hda_spdif_out_switch_info
 
 static int snd_hda_spdif_in_switch_get(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 
         ucontrol->value.integer.value[0] = codec->spdif_in_enable;
         return 0;
 }
 
 static int snd_hda_spdif_in_switch_put(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = kcontrol->private_value;
         unsigned int val = !!ucontrol->value.integer.value[0];
         int change;
 
         mutex_lock(&codec->spdif_mutex);
         change = codec->spdif_in_enable != val;
         if (change) {
                 codec->spdif_in_enable = val;
                 snd_hdac_regmap_write(&codec->core, nid,
                                       AC_VERB_SET_DIGI_CONVERT_1, val);
         }
         mutex_unlock(&codec->spdif_mutex);
         return change;
 }
 
 static int snd_hda_spdif_in_status_get(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         hda_nid_t nid = kcontrol->private_value;
         unsigned int val;
         unsigned int sbits;
 
         snd_hdac_regmap_read(&codec->core, nid,
                              AC_VERB_GET_DIGI_CONVERT_1, &val);
         sbits = convert_to_spdif_status(val);
         ucontrol->value.iec958.status[0] = sbits;
         ucontrol->value.iec958.status[1] = sbits >> 8;
         ucontrol->value.iec958.status[2] = sbits >> 16;
         ucontrol->value.iec958.status[3] = sbits >> 24;
         return 0;
 }
 
 static const struct snd_kcontrol_new dig_in_ctls[] = {
         {
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, SWITCH),
                 .info = snd_hda_spdif_in_switch_info,
                 .get = snd_hda_spdif_in_switch_get,
                 .put = snd_hda_spdif_in_switch_put,
         },
         {
                 .access = SNDRV_CTL_ELEM_ACCESS_READ,
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
                 .info = snd_hda_spdif_mask_info,
                 .get = snd_hda_spdif_in_status_get,
         },
         { } /* end */
 };
 
 /**
  * snd_hda_create_spdif_in_ctls - create Input SPDIF-related controls
  * @codec: the HDA codec
  * @nid: audio in widget NID
  *
  * Creates controls related with the SPDIF input.
  * Called from each patch supporting the SPDIF in.
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hda_create_spdif_in_ctls(struct hda_codec *codec, hda_nid_t nid)
 {
         int err;
         struct snd_kcontrol *kctl;
         const struct snd_kcontrol_new *dig_mix;
         int idx;
 
         idx = find_empty_mixer_ctl_idx(codec, "IEC958 Capture Switch", 0);
         if (idx < 0) {
                 codec_err(codec, "too many IEC958 inputs\n");
                 return -EBUSY;
         }
         for (dig_mix = dig_in_ctls; dig_mix->name; dig_mix++) {
                 kctl = snd_ctl_new1(dig_mix, codec);
                 if (!kctl)
                         return -ENOMEM;
                 kctl->private_value = nid;
                 err = snd_hda_ctl_add(codec, nid, kctl);
                 if (err < 0)
                         return err;
         }
         codec->spdif_in_enable =
                 snd_hda_codec_read(codec, nid, 0,
                                    AC_VERB_GET_DIGI_CONVERT_1, 0) &
                 AC_DIG1_ENABLE;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_create_spdif_in_ctls);
 
 /**
  * snd_hda_codec_set_power_to_all - Set the power state to all widgets
  * @codec: the HDA codec
  * @fg: function group (not used now)
  * @power_state: the power state to set (AC_PWRST_*)
  *
  * Set the given power state to all widgets that have the power control.
  * If the codec has power_filter set, it evaluates the power state and
  * filter out if it's unchanged as D3.
  */
 void snd_hda_codec_set_power_to_all(struct hda_codec *codec, hda_nid_t fg,
                                     unsigned int power_state)
 {
         hda_nid_t nid;
 
         for_each_hda_codec_node(nid, codec) {
                 unsigned int wcaps = get_wcaps(codec, nid);
                 unsigned int state = power_state;
                 if (!(wcaps & AC_WCAP_POWER))
                         continue;
                 if (codec->power_filter) {
                         state = codec->power_filter(codec, nid, power_state);
                         if (state != power_state && power_state == AC_PWRST_D3)
                                 continue;
                 }
                 snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_POWER_STATE,
                                     state);
         }
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_set_power_to_all);
 
 /**
  * snd_hda_codec_eapd_power_filter - A power filter callback for EAPD
  * @codec: the HDA codec
  * @nid: widget NID
  * @power_state: power state to evalue
  *
  * Don't power down the widget if it controls eapd and EAPD_BTLENABLE is set.
  * This can be used a codec power_filter callback.
  */
 unsigned int snd_hda_codec_eapd_power_filter(struct hda_codec *codec,
                                              hda_nid_t nid,
                                              unsigned int power_state)
 {
         if (nid == codec->core.afg || nid == codec->core.mfg)
                 return power_state;
         if (power_state == AC_PWRST_D3 &&
             get_wcaps_type(get_wcaps(codec, nid)) == AC_WID_PIN &&
             (snd_hda_query_pin_caps(codec, nid) & AC_PINCAP_EAPD)) {
                 int eapd = snd_hda_codec_read(codec, nid, 0,
                                               AC_VERB_GET_EAPD_BTLENABLE, 0);
                 if (eapd & 0x02)
                         return AC_PWRST_D0;
         }
         return power_state;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_eapd_power_filter);
 
 /*
  * set power state of the codec, and return the power state
  */
 static unsigned int hda_set_power_state(struct hda_codec *codec,
                                         unsigned int power_state)
 {
         hda_nid_t fg = codec->core.afg ? codec->core.afg : codec->core.mfg;
         int count;
         unsigned int state;
         int flags = 0;
 
         /* this delay seems necessary to avoid click noise at power-down */
         if (power_state == AC_PWRST_D3) {
                 if (codec->depop_delay < 0)
                         msleep(codec_has_epss(codec) ? 10 : 100);
                 else if (codec->depop_delay > 0)
                         msleep(codec->depop_delay);
                 flags = HDA_RW_NO_RESPONSE_FALLBACK;
         }
 
         /* repeat power states setting at most 10 times*/
         for (count = 0; count < 10; count++) {
                 if (codec->patch_ops.set_power_state)
                         codec->patch_ops.set_power_state(codec, fg,
                                                          power_state);
                 else {
                         state = power_state;
                         if (codec->power_filter)
                                 state = codec->power_filter(codec, fg, state);
                         if (state == power_state || power_state != AC_PWRST_D3)
                                 snd_hda_codec_read(codec, fg, flags,
                                                    AC_VERB_SET_POWER_STATE,
                                                    state);
                         snd_hda_codec_set_power_to_all(codec, fg, power_state);
                 }
                 state = snd_hda_sync_power_state(codec, fg, power_state);
                 if (!(state & AC_PWRST_ERROR))
                         break;
         }
 
         return state;
 }
 
 /* sync power states of all widgets;
  * this is called at the end of codec parsing
  */
 static void sync_power_up_states(struct hda_codec *codec)
 {
         hda_nid_t nid;
 
         /* don't care if no filter is used */
         if (!codec->power_filter)
                 return;
 
         for_each_hda_codec_node(nid, codec) {
                 unsigned int wcaps = get_wcaps(codec, nid);
                 unsigned int target;
                 if (!(wcaps & AC_WCAP_POWER))
                         continue;
                 target = codec->power_filter(codec, nid, AC_PWRST_D0);
                 if (target == AC_PWRST_D0)
                         continue;
                 if (!snd_hda_check_power_state(codec, nid, target))
                         snd_hda_codec_write(codec, nid, 0,
                                             AC_VERB_SET_POWER_STATE, target);
         }
 }
 
 #ifdef CONFIG_SND_HDA_RECONFIG
 /* execute additional init verbs */
 static void hda_exec_init_verbs(struct hda_codec *codec)
 {
         if (codec->init_verbs.list)
                 snd_hda_sequence_write(codec, codec->init_verbs.list);
 }
 #else
 static inline void hda_exec_init_verbs(struct hda_codec *codec) {}
 #endif
 
 /* update the power on/off account with the current jiffies */
 static void update_power_acct(struct hda_codec *codec, bool on)
 {
         unsigned long delta = jiffies - codec->power_jiffies;
 
         if (on)
                 codec->power_on_acct += delta;
         else
                 codec->power_off_acct += delta;
         codec->power_jiffies += delta;
 }
 
 void snd_hda_update_power_acct(struct hda_codec *codec)
 {
         update_power_acct(codec, hda_codec_is_power_on(codec));
 }
 
 /*
  * call suspend and power-down; used both from PM and power-save
  * this function returns the power state in the end
  */
 static unsigned int hda_call_codec_suspend(struct hda_codec *codec)
 {
         unsigned int state;
 
         snd_hdac_enter_pm(&codec->core);
         if (codec->patch_ops.suspend)
                 codec->patch_ops.suspend(codec);
         if (!codec->no_stream_clean_at_suspend)
                 hda_cleanup_all_streams(codec);
         state = hda_set_power_state(codec, AC_PWRST_D3);
         update_power_acct(codec, true);
         snd_hdac_leave_pm(&codec->core);
         return state;
 }
 
 /*
  * kick up codec; used both from PM and power-save
  */
 static void hda_call_codec_resume(struct hda_codec *codec)
 {
         snd_hdac_enter_pm(&codec->core);
         if (codec->core.regmap)
                 regcache_mark_dirty(codec->core.regmap);
 
         codec->power_jiffies = jiffies;
 
         hda_set_power_state(codec, AC_PWRST_D0);
         restore_shutup_pins(codec);
         hda_exec_init_verbs(codec);
         snd_hda_jack_set_dirty_all(codec);
         if (codec->patch_ops.resume)
                 codec->patch_ops.resume(codec);
         else {
                 if (codec->patch_ops.init)
                         codec->patch_ops.init(codec);
                 snd_hda_regmap_sync(codec);
         }
 
         if (codec->jackpoll_interval)
                 hda_jackpoll_work(&codec->jackpoll_work.work);
         else
                 snd_hda_jack_report_sync(codec);
         codec->core.dev.power.power_state = PMSG_ON;
         snd_hdac_leave_pm(&codec->core);
 }
 
 static int hda_codec_runtime_suspend(struct device *dev)
 {
         struct hda_codec *codec = dev_to_hda_codec(dev);
         unsigned int state;
 
         /* Nothing to do if card registration fails and the component driver never probes */
         if (!codec->card)
                 return 0;
 
         cancel_delayed_work_sync(&codec->jackpoll_work);
 
         state = hda_call_codec_suspend(codec);
         if (codec->link_down_at_suspend ||
             (codec_has_clkstop(codec) && codec_has_epss(codec) &&
              (state & AC_PWRST_CLK_STOP_OK)))
                 snd_hdac_codec_link_down(&codec->core);
         snd_hda_codec_display_power(codec, false);
 
         if (codec->bus->jackpoll_in_suspend &&
                 (dev->power.power_state.event != PM_EVENT_SUSPEND))
                 schedule_delayed_work(&codec->jackpoll_work,
                                         codec->jackpoll_interval);
         return 0;
 }
 
 static int hda_codec_runtime_resume(struct device *dev)
 {
         struct hda_codec *codec = dev_to_hda_codec(dev);
 
         /* Nothing to do if card registration fails and the component driver never probes */
         if (!codec->card)
                 return 0;
 
         snd_hda_codec_display_power(codec, true);
         snd_hdac_codec_link_up(&codec->core);
         hda_call_codec_resume(codec);
         pm_runtime_mark_last_busy(dev);
         return 0;
 }
 
 static int hda_codec_pm_prepare(struct device *dev)
 {
         struct hda_codec *codec = dev_to_hda_codec(dev);
 
         cancel_delayed_work_sync(&codec->jackpoll_work);
         dev->power.power_state = PMSG_SUSPEND;
         return pm_runtime_suspended(dev);
 }
 
 static void hda_codec_pm_complete(struct device *dev)
 {
         struct hda_codec *codec = dev_to_hda_codec(dev);
 
         /* If no other pm-functions are called between prepare() and complete() */
         if (dev->power.power_state.event == PM_EVENT_SUSPEND)
                 dev->power.power_state = PMSG_RESUME;
 
         if (pm_runtime_suspended(dev) && (codec->jackpoll_interval ||
             hda_codec_need_resume(codec) || codec->forced_resume))
                 pm_request_resume(dev);
 }
 
 static int hda_codec_pm_suspend(struct device *dev)
 {
         dev->power.power_state = PMSG_SUSPEND;
         return pm_runtime_force_suspend(dev);
 }
 
 static int hda_codec_pm_resume(struct device *dev)
 {
         dev->power.power_state = PMSG_RESUME;
         return pm_runtime_force_resume(dev);
 }
 
 static int hda_codec_pm_freeze(struct device *dev)
 {
         struct hda_codec *codec = dev_to_hda_codec(dev);
 
         cancel_delayed_work_sync(&codec->jackpoll_work);
         dev->power.power_state = PMSG_FREEZE;
         return pm_runtime_force_suspend(dev);
 }
 
 static int hda_codec_pm_thaw(struct device *dev)
 {
         dev->power.power_state = PMSG_THAW;
         return pm_runtime_force_resume(dev);
 }
 
 static int hda_codec_pm_restore(struct device *dev)
 {
         dev->power.power_state = PMSG_RESTORE;
         return pm_runtime_force_resume(dev);
 }
 
 /* referred in hda_bind.c */
 const struct dev_pm_ops hda_codec_driver_pm = {
         .prepare = pm_sleep_ptr(hda_codec_pm_prepare),
         .complete = pm_sleep_ptr(hda_codec_pm_complete),
         .suspend = pm_sleep_ptr(hda_codec_pm_suspend),
         .resume = pm_sleep_ptr(hda_codec_pm_resume),
         .freeze = pm_sleep_ptr(hda_codec_pm_freeze),
         .thaw = pm_sleep_ptr(hda_codec_pm_thaw),
         .poweroff = pm_sleep_ptr(hda_codec_pm_suspend),
         .restore = pm_sleep_ptr(hda_codec_pm_restore),
         .runtime_suspend = pm_ptr(hda_codec_runtime_suspend),
         .runtime_resume = pm_ptr(hda_codec_runtime_resume),
 };
 
 /* suspend the codec at shutdown; called from driver's shutdown callback */
 void snd_hda_codec_shutdown(struct hda_codec *codec)
 {
         struct hda_pcm *cpcm;
 
         /* Skip the shutdown if codec is not registered */
         if (!codec->core.registered)
                 return;
 
         cancel_delayed_work_sync(&codec->jackpoll_work);
         list_for_each_entry(cpcm, &codec->pcm_list_head, list)
                 snd_pcm_suspend_all(cpcm->pcm);
 
         pm_runtime_force_suspend(hda_codec_dev(codec));
         pm_runtime_disable(hda_codec_dev(codec));
 }
 
 /*
  * add standard channel maps if not specified
  */
 static int add_std_chmaps(struct hda_codec *codec)
 {
         struct hda_pcm *pcm;
         int str, err;
 
         list_for_each_entry(pcm, &codec->pcm_list_head, list) {
                 for (str = 0; str < 2; str++) {
                         struct hda_pcm_stream *hinfo = &pcm->stream[str];
                         struct snd_pcm_chmap *chmap;
                         const struct snd_pcm_chmap_elem *elem;
 
                         if (!pcm->pcm || pcm->own_chmap || !hinfo->substreams)
                                 continue;
                         elem = hinfo->chmap ? hinfo->chmap : snd_pcm_std_chmaps;
                         err = snd_pcm_add_chmap_ctls(pcm->pcm, str, elem,
                                                      hinfo->channels_max,
                                                      0, &chmap);
                         if (err < 0)
                                 return err;
                         chmap->channel_mask = SND_PCM_CHMAP_MASK_2468;
                 }
         }
         return 0;
 }
 
 /* default channel maps for 2.1 speakers;
  * since HD-audio supports only stereo, odd number channels are omitted
  */
 const struct snd_pcm_chmap_elem snd_pcm_2_1_chmaps[] = {
         { .channels = 2,
           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
         { .channels = 4,
           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
                    SNDRV_CHMAP_LFE, SNDRV_CHMAP_LFE } },
         { }
 };
 EXPORT_SYMBOL_GPL(snd_pcm_2_1_chmaps);
 
 int snd_hda_codec_build_controls(struct hda_codec *codec)
 {
         int err = 0;
         hda_exec_init_verbs(codec);
         /* continue to initialize... */
         if (codec->patch_ops.init)
                 err = codec->patch_ops.init(codec);
         if (!err && codec->patch_ops.build_controls)
                 err = codec->patch_ops.build_controls(codec);
         if (err < 0)
                 return err;
 
         /* we create chmaps here instead of build_pcms */
         err = add_std_chmaps(codec);
         if (err < 0)
                 return err;
 
         if (codec->jackpoll_interval)
                 hda_jackpoll_work(&codec->jackpoll_work.work);
         else
                 snd_hda_jack_report_sync(codec); /* call at the last init point */
         sync_power_up_states(codec);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_build_controls);
 
 /*
  * PCM stuff
  */
 static int hda_pcm_default_open_close(struct hda_pcm_stream *hinfo,
                                       struct hda_codec *codec,
                                       struct snd_pcm_substream *substream)
 {
         return 0;
 }
 
 static int hda_pcm_default_prepare(struct hda_pcm_stream *hinfo,
                                    struct hda_codec *codec,
                                    unsigned int stream_tag,
                                    unsigned int format,
                                    struct snd_pcm_substream *substream)
 {
         snd_hda_codec_setup_stream(codec, hinfo->nid, stream_tag, 0, format);
         return 0;
 }
 
 static int hda_pcm_default_cleanup(struct hda_pcm_stream *hinfo,
                                    struct hda_codec *codec,
                                    struct snd_pcm_substream *substream)
 {
         snd_hda_codec_cleanup_stream(codec, hinfo->nid);
         return 0;
 }
 
 static int set_pcm_default_values(struct hda_codec *codec,
                                   struct hda_pcm_stream *info)
 {
         int err;
 
         /* query support PCM information from the given NID */
         if (info->nid && (!info->rates || !info->formats)) {
                 err = snd_hda_query_supported_pcm(codec, info->nid,
                                 info->rates ? NULL : &info->rates,
                                 info->formats ? NULL : &info->formats,
                                 info->subformats ? NULL : &info->subformats,
                                 info->maxbps ? NULL : &info->maxbps);
                 if (err < 0)
                         return err;
         }
         if (info->ops.open == NULL)
                 info->ops.open = hda_pcm_default_open_close;
         if (info->ops.close == NULL)
                 info->ops.close = hda_pcm_default_open_close;
         if (info->ops.prepare == NULL) {
                 if (snd_BUG_ON(!info->nid))
                         return -EINVAL;
                 info->ops.prepare = hda_pcm_default_prepare;
         }
         if (info->ops.cleanup == NULL) {
                 if (snd_BUG_ON(!info->nid))
                         return -EINVAL;
                 info->ops.cleanup = hda_pcm_default_cleanup;
         }
         return 0;
 }
 
 /*
  * codec prepare/cleanup entries
  */
 /**
  * snd_hda_codec_prepare - Prepare a stream
  * @codec: the HDA codec
  * @hinfo: PCM information
  * @stream: stream tag to assign
  * @format: format id to assign
  * @substream: PCM substream to assign
  *
  * Calls the prepare callback set by the codec with the given arguments.
  * Clean up the inactive streams when successful.
  */
 int snd_hda_codec_prepare(struct hda_codec *codec,
                           struct hda_pcm_stream *hinfo,
                           unsigned int stream,
                           unsigned int format,
                           struct snd_pcm_substream *substream)
 {
         int ret;
         mutex_lock(&codec->bus->prepare_mutex);
         if (hinfo->ops.prepare)
                 ret = hinfo->ops.prepare(hinfo, codec, stream, format,
                                          substream);
         else
                 ret = -ENODEV;
         if (ret >= 0)
                 purify_inactive_streams(codec);
         mutex_unlock(&codec->bus->prepare_mutex);
         return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_prepare);
 
 /**
  * snd_hda_codec_cleanup - Clean up stream resources
  * @codec: the HDA codec
  * @hinfo: PCM information
  * @substream: PCM substream
  *
  * Calls the cleanup callback set by the codec with the given arguments.
  */
 void snd_hda_codec_cleanup(struct hda_codec *codec,
                            struct hda_pcm_stream *hinfo,
                            struct snd_pcm_substream *substream)
 {
         mutex_lock(&codec->bus->prepare_mutex);
         if (hinfo->ops.cleanup)
                 hinfo->ops.cleanup(hinfo, codec, substream);
         mutex_unlock(&codec->bus->prepare_mutex);
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_cleanup);
 
 /* global */
 const char *snd_hda_pcm_type_name[HDA_PCM_NTYPES] = {
         "Audio", "SPDIF", "HDMI", "Modem"
 };
 
 /*
  * get the empty PCM device number to assign
  */
 static int get_empty_pcm_device(struct hda_bus *bus, unsigned int type)
 {
         /* audio device indices; not linear to keep compatibility */
         /* assigned to static slots up to dev#10; if more needed, assign
          * the later slot dynamically (when CONFIG_SND_DYNAMIC_MINORS=y)
          */
         static const int audio_idx[HDA_PCM_NTYPES][5] = {
                 [HDA_PCM_TYPE_AUDIO] = { 0, 2, 4, 5, -1 },
                 [HDA_PCM_TYPE_SPDIF] = { 1, -1 },
                 [HDA_PCM_TYPE_HDMI]  = { 3, 7, 8, 9, -1 },
                 [HDA_PCM_TYPE_MODEM] = { 6, -1 },
         };
         int i;
 
         if (type >= HDA_PCM_NTYPES) {
                 dev_err(bus->card->dev, "Invalid PCM type %d\n", type);
                 return -EINVAL;
         }
 
         for (i = 0; audio_idx[type][i] >= 0; i++) {
 #ifndef CONFIG_SND_DYNAMIC_MINORS
                 if (audio_idx[type][i] >= 8)
                         break;
 #endif
                 if (!test_and_set_bit(audio_idx[type][i], bus->pcm_dev_bits))
                         return audio_idx[type][i];
         }
 
 #ifdef CONFIG_SND_DYNAMIC_MINORS
         /* non-fixed slots starting from 10 */
         for (i = 10; i < 32; i++) {
                 if (!test_and_set_bit(i, bus->pcm_dev_bits))
                         return i;
         }
 #endif
 
         dev_warn(bus->card->dev, "Too many %s devices\n",
                 snd_hda_pcm_type_name[type]);
 #ifndef CONFIG_SND_DYNAMIC_MINORS
         dev_warn(bus->card->dev,
                  "Consider building the kernel with CONFIG_SND_DYNAMIC_MINORS=y\n");
 #endif
         return -EAGAIN;
 }
 
 /* call build_pcms ops of the given codec and set up the default parameters */
 int snd_hda_codec_parse_pcms(struct hda_codec *codec)
 {
         struct hda_pcm *cpcm;
         int err;
 
         if (!list_empty(&codec->pcm_list_head))
                 return 0; /* already parsed */
 
         if (!codec->patch_ops.build_pcms)
                 return 0;
 
         err = codec->patch_ops.build_pcms(codec);
         if (err < 0) {
                 codec_err(codec, "cannot build PCMs for #%d (error %d)\n",
                           codec->core.addr, err);
                 return err;
         }
 
         list_for_each_entry(cpcm, &codec->pcm_list_head, list) {
                 int stream;
 
                 for_each_pcm_streams(stream) {
                         struct hda_pcm_stream *info = &cpcm->stream[stream];
 
                         if (!info->substreams)
                                 continue;
                         err = set_pcm_default_values(codec, info);
                         if (err < 0) {
                                 codec_warn(codec,
                                            "fail to setup default for PCM %s\n",
                                            cpcm->name);
                                 return err;
                         }
                 }
         }
 
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_parse_pcms);
 
 /* assign all PCMs of the given codec */
 int snd_hda_codec_build_pcms(struct hda_codec *codec)
 {
         struct hda_bus *bus = codec->bus;
         struct hda_pcm *cpcm;
         int dev, err;
 
         err = snd_hda_codec_parse_pcms(codec);
         if (err < 0)
                 return err;
 
         /* attach a new PCM streams */
         list_for_each_entry(cpcm, &codec->pcm_list_head, list) {
                 if (cpcm->pcm)
                         continue; /* already attached */
                 if (!cpcm->stream[0].substreams && !cpcm->stream[1].substreams)
                         continue; /* no substreams assigned */
 
                 dev = get_empty_pcm_device(bus, cpcm->pcm_type);
                 if (dev < 0) {
                         cpcm->device = SNDRV_PCM_INVALID_DEVICE;
                         continue; /* no fatal error */
                 }
                 cpcm->device = dev;
                 err =  snd_hda_attach_pcm_stream(bus, codec, cpcm);
                 if (err < 0) {
                         codec_err(codec,
                                   "cannot attach PCM stream %d for codec #%d\n",
                                   dev, codec->core.addr);
                         continue; /* no fatal error */
                 }
         }
 
         return 0;
 }
 
 /**
  * snd_hda_add_new_ctls - create controls from the array
  * @codec: the HDA codec
  * @knew: the array of struct snd_kcontrol_new
  *
  * This helper function creates and add new controls in the given array.
  * The array must be terminated with an empty entry as terminator.
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hda_add_new_ctls(struct hda_codec *codec,
                          const struct snd_kcontrol_new *knew)
 {
         int err;
 
         for (; knew->name; knew++) {
                 struct snd_kcontrol *kctl;
                 int addr = 0, idx = 0;
                 if (knew->iface == (__force snd_ctl_elem_iface_t)-1)
                         continue; /* skip this codec private value */
                 for (;;) {
                         kctl = snd_ctl_new1(knew, codec);
                         if (!kctl)
                                 return -ENOMEM;
                         /* Do not use the id.device field for MIXER elements.
                          * This field is for real device numbers (like PCM) but codecs
                          * are hidden components from the user space view (unrelated
                          * to the mixer element identification).
                          */
                         if (addr > 0 && codec->ctl_dev_id)
                                 kctl->id.device = addr;
                         if (idx > 0)
                                 kctl->id.index = idx;
                         err = snd_hda_ctl_add(codec, 0, kctl);
                         if (!err)
                                 break;
                         /* try first with another device index corresponding to
                          * the codec addr; if it still fails (or it's the
                          * primary codec), then try another control index
                          */
                         if (!addr && codec->core.addr) {
                                 addr = codec->core.addr;
                                 if (!codec->ctl_dev_id)
                                         idx += 10 * addr;
                         } else if (!idx && !knew->index) {
                                 idx = find_empty_mixer_ctl_idx(codec,
                                                                knew->name, 0);
                                 if (idx <= 0)
                                         return err;
                         } else
                                 return err;
                 }
         }
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_add_new_ctls);
 
 /**
  * snd_hda_codec_set_power_save - Configure codec's runtime PM
  * @codec: codec device to configure
  * @delay: autosuspend delay
  */
 void snd_hda_codec_set_power_save(struct hda_codec *codec, int delay)
 {
         struct device *dev = hda_codec_dev(codec);
 
         if (delay == 0 && codec->auto_runtime_pm)
                 delay = 3000;
 
         if (delay > 0) {
                 pm_runtime_set_autosuspend_delay(dev, delay);
                 pm_runtime_use_autosuspend(dev);
                 pm_runtime_allow(dev);
                 if (!pm_runtime_suspended(dev))
                         pm_runtime_mark_last_busy(dev);
         } else {
                 pm_runtime_dont_use_autosuspend(dev);
                 pm_runtime_forbid(dev);
         }
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_set_power_save);
 
 /**
  * snd_hda_set_power_save - reprogram autosuspend for the given delay
  * @bus: HD-audio bus
  * @delay: autosuspend delay in msec, 0 = off
  *
  * Synchronize the runtime PM autosuspend state from the power_save option.
  */
 void snd_hda_set_power_save(struct hda_bus *bus, int delay)
 {
         struct hda_codec *c;
 
         list_for_each_codec(c, bus)
                 snd_hda_codec_set_power_save(c, delay);
 }
 EXPORT_SYMBOL_GPL(snd_hda_set_power_save);
 
 /**
  * snd_hda_check_amp_list_power - Check the amp list and update the power
  * @codec: HD-audio codec
  * @check: the object containing an AMP list and the status
  * @nid: NID to check / update
  *
  * Check whether the given NID is in the amp list.  If it's in the list,
  * check the current AMP status, and update the power-status according
  * to the mute status.
  *
  * This function is supposed to be set or called from the check_power_status
  * patch ops.
  */
 int snd_hda_check_amp_list_power(struct hda_codec *codec,
                                  struct hda_loopback_check *check,
                                  hda_nid_t nid)
 {
         const struct hda_amp_list *p;
         int ch, v;
 
         if (!check->amplist)
                 return 0;
         for (p = check->amplist; p->nid; p++) {
                 if (p->nid == nid)
                         break;
         }
         if (!p->nid)
                 return 0; /* nothing changed */
 
         for (p = check->amplist; p->nid; p++) {
                 for (ch = 0; ch < 2; ch++) {
                         v = snd_hda_codec_amp_read(codec, p->nid, ch, p->dir,
                                                    p->idx);
                         if (!(v & HDA_AMP_MUTE) && v > 0) {
                                 if (!check->power_on) {
                                         check->power_on = 1;
                                         snd_hda_power_up_pm(codec);
                                 }
                                 return 1;
                         }
                 }
         }
         if (check->power_on) {
                 check->power_on = 0;
                 snd_hda_power_down_pm(codec);
         }
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_check_amp_list_power);
 
 /*
  * input MUX helper
  */
 
 /**
  * snd_hda_input_mux_info - Info callback helper for the input-mux enum
  * @imux: imux helper object
  * @uinfo: pointer to get/store the data
  */
 int snd_hda_input_mux_info(const struct hda_input_mux *imux,
                            struct snd_ctl_elem_info *uinfo)
 {
         unsigned int index;
 
         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
         uinfo->count = 1;
         uinfo->value.enumerated.items = imux->num_items;
         if (!imux->num_items)
                 return 0;
         index = uinfo->value.enumerated.item;
         if (index >= imux->num_items)
                 index = imux->num_items - 1;
         strcpy(uinfo->value.enumerated.name, imux->items[index].label);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_input_mux_info);
 
 /**
  * snd_hda_input_mux_put - Put callback helper for the input-mux enum
  * @codec: the HDA codec
  * @imux: imux helper object
  * @ucontrol: pointer to get/store the data
  * @nid: input mux NID
  * @cur_val: pointer to get/store the current imux value
  */
 int snd_hda_input_mux_put(struct hda_codec *codec,
                           const struct hda_input_mux *imux,
                           struct snd_ctl_elem_value *ucontrol,
                           hda_nid_t nid,
                           unsigned int *cur_val)
 {
         unsigned int idx;
 
         if (!imux->num_items)
                 return 0;
         idx = ucontrol->value.enumerated.item[0];
         if (idx >= imux->num_items)
                 idx = imux->num_items - 1;
         if (*cur_val == idx)
                 return 0;
         snd_hda_codec_write_cache(codec, nid, 0, AC_VERB_SET_CONNECT_SEL,
                                   imux->items[idx].index);
         *cur_val = idx;
         return 1;
 }
 EXPORT_SYMBOL_GPL(snd_hda_input_mux_put);
 
 
 /**
  * snd_hda_enum_helper_info - Helper for simple enum ctls
  * @kcontrol: ctl element
  * @uinfo: pointer to get/store the data
  * @num_items: number of enum items
  * @texts: enum item string array
  *
  * process kcontrol info callback of a simple string enum array
  * when @num_items is 0 or @texts is NULL, assume a boolean enum array
  */
 int snd_hda_enum_helper_info(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_info *uinfo,
                              int num_items, const char * const *texts)
 {
         static const char * const texts_default[] = {
                 "Disabled", "Enabled"
         };
 
         if (!texts || !num_items) {
                 num_items = 2;
                 texts = texts_default;
         }
 
         return snd_ctl_enum_info(uinfo, 1, num_items, texts);
 }
 EXPORT_SYMBOL_GPL(snd_hda_enum_helper_info);
 
 /*
  * Multi-channel / digital-out PCM helper functions
  */
 
 /* setup SPDIF output stream */
 static void setup_dig_out_stream(struct hda_codec *codec, hda_nid_t nid,
                                  unsigned int stream_tag, unsigned int format)
 {
         struct hda_spdif_out *spdif;
         unsigned int curr_fmt;
         bool reset;
 
         spdif = snd_hda_spdif_out_of_nid(codec, nid);
         /* Add sanity check to pass klockwork check.
          * This should never happen.
          */
         if (WARN_ON(spdif == NULL))
                 return;
 
         curr_fmt = snd_hda_codec_read(codec, nid, 0,
                                       AC_VERB_GET_STREAM_FORMAT, 0);
         reset = codec->spdif_status_reset &&
                 (spdif->ctls & AC_DIG1_ENABLE) &&
                 curr_fmt != format;
 
         /* turn off SPDIF if needed; otherwise the IEC958 bits won't be
            updated */
         if (reset)
                 set_dig_out_convert(codec, nid,
                                     spdif->ctls & ~AC_DIG1_ENABLE & 0xff,
                                     -1);
         snd_hda_codec_setup_stream(codec, nid, stream_tag, 0, format);
         if (codec->follower_dig_outs) {
                 const hda_nid_t *d;
                 for (d = codec->follower_dig_outs; *d; d++)
                         snd_hda_codec_setup_stream(codec, *d, stream_tag, 0,
                                                    format);
         }
         /* turn on again (if needed) */
         if (reset)
                 set_dig_out_convert(codec, nid,
                                     spdif->ctls & 0xff, -1);
 }
 
 static void cleanup_dig_out_stream(struct hda_codec *codec, hda_nid_t nid)
 {
         snd_hda_codec_cleanup_stream(codec, nid);
         if (codec->follower_dig_outs) {
                 const hda_nid_t *d;
                 for (d = codec->follower_dig_outs; *d; d++)
                         snd_hda_codec_cleanup_stream(codec, *d);
         }
 }
 
 /**
  * snd_hda_multi_out_dig_open - open the digital out in the exclusive mode
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  */
 int snd_hda_multi_out_dig_open(struct hda_codec *codec,
                                struct hda_multi_out *mout)
 {
         mutex_lock(&codec->spdif_mutex);
         if (mout->dig_out_used == HDA_DIG_ANALOG_DUP)
                 /* already opened as analog dup; reset it once */
                 cleanup_dig_out_stream(codec, mout->dig_out_nid);
         mout->dig_out_used = HDA_DIG_EXCLUSIVE;
         mutex_unlock(&codec->spdif_mutex);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_dig_open);
 
 /**
  * snd_hda_multi_out_dig_prepare - prepare the digital out stream
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  * @stream_tag: stream tag to assign
  * @format: format id to assign
  * @substream: PCM substream to assign
  */
 int snd_hda_multi_out_dig_prepare(struct hda_codec *codec,
                                   struct hda_multi_out *mout,
                                   unsigned int stream_tag,
                                   unsigned int format,
                                   struct snd_pcm_substream *substream)
 {
         mutex_lock(&codec->spdif_mutex);
         setup_dig_out_stream(codec, mout->dig_out_nid, stream_tag, format);
         mutex_unlock(&codec->spdif_mutex);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_dig_prepare);
 
 /**
  * snd_hda_multi_out_dig_cleanup - clean-up the digital out stream
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  */
 int snd_hda_multi_out_dig_cleanup(struct hda_codec *codec,
                                   struct hda_multi_out *mout)
 {
         mutex_lock(&codec->spdif_mutex);
         cleanup_dig_out_stream(codec, mout->dig_out_nid);
         mutex_unlock(&codec->spdif_mutex);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_dig_cleanup);
 
 /**
  * snd_hda_multi_out_dig_close - release the digital out stream
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  */
 int snd_hda_multi_out_dig_close(struct hda_codec *codec,
                                 struct hda_multi_out *mout)
 {
         mutex_lock(&codec->spdif_mutex);
         mout->dig_out_used = 0;
         mutex_unlock(&codec->spdif_mutex);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_dig_close);
 
 /**
  * snd_hda_multi_out_analog_open - open analog outputs
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  * @substream: PCM substream to assign
  * @hinfo: PCM information to assign
  *
  * Open analog outputs and set up the hw-constraints.
  * If the digital outputs can be opened as follower, open the digital
  * outputs, too.
  */
 int snd_hda_multi_out_analog_open(struct hda_codec *codec,
                                   struct hda_multi_out *mout,
                                   struct snd_pcm_substream *substream,
                                   struct hda_pcm_stream *hinfo)
 {
         struct snd_pcm_runtime *runtime = substream->runtime;
         runtime->hw.channels_max = mout->max_channels;
         if (mout->dig_out_nid) {
                 if (!mout->analog_rates) {
                         mout->analog_rates = hinfo->rates;
                         mout->analog_formats = hinfo->formats;
                         mout->analog_maxbps = hinfo->maxbps;
                 } else {
                         runtime->hw.rates = mout->analog_rates;
                         runtime->hw.formats = mout->analog_formats;
                         hinfo->maxbps = mout->analog_maxbps;
                 }
                 if (!mout->spdif_rates) {
                         snd_hda_query_supported_pcm(codec, mout->dig_out_nid,
                                                     &mout->spdif_rates,
                                                     &mout->spdif_formats,
                                                     NULL,
                                                     &mout->spdif_maxbps);
                 }
                 mutex_lock(&codec->spdif_mutex);
                 if (mout->share_spdif) {
                         if ((runtime->hw.rates & mout->spdif_rates) &&
                             (runtime->hw.formats & mout->spdif_formats)) {
                                 runtime->hw.rates &= mout->spdif_rates;
                                 runtime->hw.formats &= mout->spdif_formats;
                                 if (mout->spdif_maxbps < hinfo->maxbps)
                                         hinfo->maxbps = mout->spdif_maxbps;
                         } else {
                                 mout->share_spdif = 0;
                                 /* FIXME: need notify? */
                         }
                 }
                 mutex_unlock(&codec->spdif_mutex);
         }
         return snd_pcm_hw_constraint_step(substream->runtime, 0,
                                           SNDRV_PCM_HW_PARAM_CHANNELS, 2);
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_analog_open);
 
 /**
  * snd_hda_multi_out_analog_prepare - Preapre the analog outputs.
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  * @stream_tag: stream tag to assign
  * @format: format id to assign
  * @substream: PCM substream to assign
  *
  * Set up the i/o for analog out.
  * When the digital out is available, copy the front out to digital out, too.
  */
 int snd_hda_multi_out_analog_prepare(struct hda_codec *codec,
                                      struct hda_multi_out *mout,
                                      unsigned int stream_tag,
                                      unsigned int format,
                                      struct snd_pcm_substream *substream)
 {
         const hda_nid_t *nids = mout->dac_nids;
         int chs = substream->runtime->channels;
         struct hda_spdif_out *spdif;
         int i;
 
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_hda_spdif_out_of_nid(codec, mout->dig_out_nid);
         if (mout->dig_out_nid && mout->share_spdif &&
             mout->dig_out_used != HDA_DIG_EXCLUSIVE) {
                 if (chs == 2 && spdif != NULL &&
                     snd_hda_is_supported_format(codec, mout->dig_out_nid,
                                                 format) &&
                     !(spdif->status & IEC958_AES0_NONAUDIO)) {
                         mout->dig_out_used = HDA_DIG_ANALOG_DUP;
                         setup_dig_out_stream(codec, mout->dig_out_nid,
                                              stream_tag, format);
                 } else {
                         mout->dig_out_used = 0;
                         cleanup_dig_out_stream(codec, mout->dig_out_nid);
                 }
         }
         mutex_unlock(&codec->spdif_mutex);
 
         /* front */
         snd_hda_codec_setup_stream(codec, nids[HDA_FRONT], stream_tag,
                                    0, format);
         if (!mout->no_share_stream &&
             mout->hp_nid && mout->hp_nid != nids[HDA_FRONT])
                 /* headphone out will just decode front left/right (stereo) */
                 snd_hda_codec_setup_stream(codec, mout->hp_nid, stream_tag,
                                            0, format);
         /* extra outputs copied from front */
         for (i = 0; i < ARRAY_SIZE(mout->hp_out_nid); i++)
                 if (!mout->no_share_stream && mout->hp_out_nid[i])
                         snd_hda_codec_setup_stream(codec,
                                                    mout->hp_out_nid[i],
                                                    stream_tag, 0, format);
 
         /* surrounds */
         for (i = 1; i < mout->num_dacs; i++) {
                 if (chs >= (i + 1) * 2) /* independent out */
                         snd_hda_codec_setup_stream(codec, nids[i], stream_tag,
                                                    i * 2, format);
                 else if (!mout->no_share_stream) /* copy front */
                         snd_hda_codec_setup_stream(codec, nids[i], stream_tag,
                                                    0, format);
         }
 
         /* extra surrounds */
         for (i = 0; i < ARRAY_SIZE(mout->extra_out_nid); i++) {
                 int ch = 0;
                 if (!mout->extra_out_nid[i])
                         break;
                 if (chs >= (i + 1) * 2)
                         ch = i * 2;
                 else if (!mout->no_share_stream)
                         break;
                 snd_hda_codec_setup_stream(codec, mout->extra_out_nid[i],
                                            stream_tag, ch, format);
         }
 
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_analog_prepare);
 
 /**
  * snd_hda_multi_out_analog_cleanup - clean up the setting for analog out
  * @codec: the HDA codec
  * @mout: hda_multi_out object
  */
 int snd_hda_multi_out_analog_cleanup(struct hda_codec *codec,
                                      struct hda_multi_out *mout)
 {
         const hda_nid_t *nids = mout->dac_nids;
         int i;
 
         for (i = 0; i < mout->num_dacs; i++)
                 snd_hda_codec_cleanup_stream(codec, nids[i]);
         if (mout->hp_nid)
                 snd_hda_codec_cleanup_stream(codec, mout->hp_nid);
         for (i = 0; i < ARRAY_SIZE(mout->hp_out_nid); i++)
                 if (mout->hp_out_nid[i])
                         snd_hda_codec_cleanup_stream(codec,
                                                      mout->hp_out_nid[i]);
         for (i = 0; i < ARRAY_SIZE(mout->extra_out_nid); i++)
                 if (mout->extra_out_nid[i])
                         snd_hda_codec_cleanup_stream(codec,
                                                      mout->extra_out_nid[i]);
         mutex_lock(&codec->spdif_mutex);
         if (mout->dig_out_nid && mout->dig_out_used == HDA_DIG_ANALOG_DUP) {
                 cleanup_dig_out_stream(codec, mout->dig_out_nid);
                 mout->dig_out_used = 0;
         }
         mutex_unlock(&codec->spdif_mutex);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_multi_out_analog_cleanup);
 
 /**
  * snd_hda_get_default_vref - Get the default (mic) VREF pin bits
  * @codec: the HDA codec
  * @pin: referred pin NID
  *
  * Guess the suitable VREF pin bits to be set as the pin-control value.
  * Note: the function doesn't set the AC_PINCTL_IN_EN bit.
  */
 unsigned int snd_hda_get_default_vref(struct hda_codec *codec, hda_nid_t pin)
 {
         unsigned int pincap;
         unsigned int oldval;
         oldval = snd_hda_codec_read(codec, pin, 0,
                                     AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
         pincap = snd_hda_query_pin_caps(codec, pin);
         pincap = (pincap & AC_PINCAP_VREF) >> AC_PINCAP_VREF_SHIFT;
         /* Exception: if the default pin setup is vref50, we give it priority */
         if ((pincap & AC_PINCAP_VREF_80) && oldval != PIN_VREF50)
                 return AC_PINCTL_VREF_80;
         else if (pincap & AC_PINCAP_VREF_50)
                 return AC_PINCTL_VREF_50;
         else if (pincap & AC_PINCAP_VREF_100)
                 return AC_PINCTL_VREF_100;
         else if (pincap & AC_PINCAP_VREF_GRD)
                 return AC_PINCTL_VREF_GRD;
         return AC_PINCTL_VREF_HIZ;
 }
 EXPORT_SYMBOL_GPL(snd_hda_get_default_vref);
 
 /**
  * snd_hda_correct_pin_ctl - correct the pin ctl value for matching with the pin cap
  * @codec: the HDA codec
  * @pin: referred pin NID
  * @val: pin ctl value to audit
  */
 unsigned int snd_hda_correct_pin_ctl(struct hda_codec *codec,
                                      hda_nid_t pin, unsigned int val)
 {
         static const unsigned int cap_lists[][2] = {
                 { AC_PINCTL_VREF_100, AC_PINCAP_VREF_100 },
                 { AC_PINCTL_VREF_80, AC_PINCAP_VREF_80 },
                 { AC_PINCTL_VREF_50, AC_PINCAP_VREF_50 },
                 { AC_PINCTL_VREF_GRD, AC_PINCAP_VREF_GRD },
         };
         unsigned int cap;
 
         if (!val)
                 return 0;
         cap = snd_hda_query_pin_caps(codec, pin);
         if (!cap)
                 return val; /* don't know what to do... */
 
         if (val & AC_PINCTL_OUT_EN) {
                 if (!(cap & AC_PINCAP_OUT))
                         val &= ~(AC_PINCTL_OUT_EN | AC_PINCTL_HP_EN);
                 else if ((val & AC_PINCTL_HP_EN) && !(cap & AC_PINCAP_HP_DRV))
                         val &= ~AC_PINCTL_HP_EN;
         }
 
         if (val & AC_PINCTL_IN_EN) {
                 if (!(cap & AC_PINCAP_IN))
                         val &= ~(AC_PINCTL_IN_EN | AC_PINCTL_VREFEN);
                 else {
                         unsigned int vcap, vref;
                         int i;
                         vcap = (cap & AC_PINCAP_VREF) >> AC_PINCAP_VREF_SHIFT;
                         vref = val & AC_PINCTL_VREFEN;
                         for (i = 0; i < ARRAY_SIZE(cap_lists); i++) {
                                 if (vref == cap_lists[i][0] &&
                                     !(vcap & cap_lists[i][1])) {
                                         if (i == ARRAY_SIZE(cap_lists) - 1)
                                                 vref = AC_PINCTL_VREF_HIZ;
                                         else
                                                 vref = cap_lists[i + 1][0];
                                 }
                         }
                         val &= ~AC_PINCTL_VREFEN;
                         val |= vref;
                 }
         }
 
         return val;
 }
 EXPORT_SYMBOL_GPL(snd_hda_correct_pin_ctl);
 
 /**
  * _snd_hda_set_pin_ctl - Helper to set pin ctl value
  * @codec: the HDA codec
  * @pin: referred pin NID
  * @val: pin control value to set
  * @cached: access over codec pinctl cache or direct write
  *
  * This function is a helper to set a pin ctl value more safely.
  * It corrects the pin ctl value via snd_hda_correct_pin_ctl(), stores the
  * value in pin target array via snd_hda_codec_set_pin_target(), then
  * actually writes the value via either snd_hda_codec_write_cache() or
  * snd_hda_codec_write() depending on @cached flag.
  */
 int _snd_hda_set_pin_ctl(struct hda_codec *codec, hda_nid_t pin,
                          unsigned int val, bool cached)
 {
         val = snd_hda_correct_pin_ctl(codec, pin, val);
         snd_hda_codec_set_pin_target(codec, pin, val);
         if (cached)
                 return snd_hda_codec_write_cache(codec, pin, 0,
                                 AC_VERB_SET_PIN_WIDGET_CONTROL, val);
         else
                 return snd_hda_codec_write(codec, pin, 0,
                                            AC_VERB_SET_PIN_WIDGET_CONTROL, val);
 }
 EXPORT_SYMBOL_GPL(_snd_hda_set_pin_ctl);
 
 /**
  * snd_hda_add_imux_item - Add an item to input_mux
  * @codec: the HDA codec
  * @imux: imux helper object
  * @label: the name of imux item to assign
  * @index: index number of imux item to assign
  * @type_idx: pointer to store the resultant label index
  *
  * When the same label is used already in the existing items, the number
  * suffix is appended to the label.  This label index number is stored
  * to type_idx when non-NULL pointer is given.
  */
 int snd_hda_add_imux_item(struct hda_codec *codec,
                           struct hda_input_mux *imux, const char *label,
                           int index, int *type_idx)
 {
         int i, label_idx = 0;
         if (imux->num_items >= HDA_MAX_NUM_INPUTS) {
                 codec_err(codec, "hda_codec: Too many imux items!\n");
                 return -EINVAL;
         }
         for (i = 0; i < imux->num_items; i++) {
                 if (!strncmp(label, imux->items[i].label, strlen(label)))
                         label_idx++;
         }
         if (type_idx)
                 *type_idx = label_idx;
         if (label_idx > 0)
                 snprintf(imux->items[imux->num_items].label,
                          sizeof(imux->items[imux->num_items].label),
                          "%s %d", label, label_idx);
         else
                 strscpy(imux->items[imux->num_items].label, label,
                         sizeof(imux->items[imux->num_items].label));
         imux->items[imux->num_items].index = index;
         imux->num_items++;
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_add_imux_item);
 
 /**
  * snd_hda_bus_reset_codecs - Reset the bus
  * @bus: HD-audio bus
  */
 void snd_hda_bus_reset_codecs(struct hda_bus *bus)
 {
         struct hda_codec *codec;
 
         list_for_each_codec(codec, bus) {
                 /* FIXME: maybe a better way needed for forced reset */
                 if (current_work() != &codec->jackpoll_work.work)
                         cancel_delayed_work_sync(&codec->jackpoll_work);
                 if (hda_codec_is_power_on(codec)) {
                         hda_call_codec_suspend(codec);
                         hda_call_codec_resume(codec);
                 }
         }
 }
 
 /**
  * snd_print_pcm_bits - Print the supported PCM fmt bits to the string buffer
  * @pcm: PCM caps bits
  * @buf: the string buffer to write
  * @buflen: the max buffer length
  *
  * used by hda_proc.c and hda_eld.c
  */
 void snd_print_pcm_bits(int pcm, char *buf, int buflen)
 {
         static const unsigned int bits[] = { 8, 16, 20, 24, 32 };
         int i, j;
 
         for (i = 0, j = 0; i < ARRAY_SIZE(bits); i++)
                 if (pcm & (AC_SUPPCM_BITS_8 << i))
                         j += scnprintf(buf + j, buflen - j,  " %d", bits[i]);
 
         buf[j] = '\0'; /* necessary when j == 0 */
 }
 EXPORT_SYMBOL_GPL(snd_print_pcm_bits);
 
 MODULE_DESCRIPTION("HDA codec core");
 MODULE_LICENSE("GPL");