1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * hdac-ext-bus.c - HD-audio extended core bus functions.
4 *
5 * Copyright (C) 2014-2015 Intel Corp
6 * Author: Jeeja KP <jeeja.kp@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/io.h>
15 #include <sound/hdaudio_ext.h>
16
17 MODULE_DESCRIPTION("HDA extended core");
18 MODULE_LICENSE("GPL v2");
19
20 /**
21 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
22 * @bus: the pointer to HDAC bus object
23 * @dev: device pointer
24 * @ops: bus verb operators
25 * @ext_ops: operators used for ASoC HDA codec drivers
26 *
27 * Returns 0 if successful, or a negative error code.
28 */
29 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
30 const struct hdac_bus_ops *ops,
31 const struct hdac_ext_bus_ops *ext_ops)
32 {
33 int ret;
34
35 ret = snd_hdac_bus_init(bus, dev, ops);
36 if (ret < 0)
37 return ret;
38
39 bus->ext_ops = ext_ops;
40 /* FIXME:
41 * Currently only one bus is supported, if there is device with more
42 * buses, bus->idx should be greater than 0, but there needs to be a
43 * reliable way to always assign same number.
44 */
45 bus->idx = 0;
46 bus->cmd_dma_state = true;
47
48 return 0;
49 }
50 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
51
52 /**
53 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
54 * @bus: the pointer to HDAC bus object
55 */
56 void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
57 {
58 snd_hdac_bus_exit(bus);
59 WARN_ON(!list_empty(&bus->hlink_list));
60 }
61 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
62
63 /**
64 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
65 *
66 * @bus: the pointer to HDAC bus object
67 */
68 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
69 {
70 struct hdac_device *codec, *__codec;
71 /*
72 * we need to remove all the codec devices objects created in the
73 * snd_hdac_ext_bus_device_init
74 */
75 list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
76 snd_hdac_device_unregister(codec);
77 put_device(&codec->dev);
78 }
79 }
80 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
81 #define dev_to_hdac(dev) (container_of((dev), \
82 struct hdac_device, dev))
83
84 static inline struct hdac_driver *get_hdrv(struct device *dev)
85 {
86 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
87 return hdrv;
88 }
89
90 static inline struct hdac_device *get_hdev(struct device *dev)
91 {
92 struct hdac_device *hdev = dev_to_hdac_dev(dev);
93 return hdev;
94 }
95
96 static int hda_ext_drv_probe(struct device *dev)
97 {
98 return (get_hdrv(dev))->probe(get_hdev(dev));
99 }
100
101 static int hdac_ext_drv_remove(struct device *dev)
102 {
103 return (get_hdrv(dev))->remove(get_hdev(dev));
104 }
105
106 static void hdac_ext_drv_shutdown(struct device *dev)
107 {
108 return (get_hdrv(dev))->shutdown(get_hdev(dev));
109 }
110
111 /**
112 * snd_hda_ext_driver_register - register a driver for ext hda devices
113 *
114 * @drv: ext hda driver structure
115 */
116 int snd_hda_ext_driver_register(struct hdac_driver *drv)
117 {
118 drv->type = HDA_DEV_ASOC;
119 drv->driver.bus = &snd_hda_bus_type;
120 /* we use default match */
121
122 if (drv->probe)
123 drv->driver.probe = hda_ext_drv_probe;
124 if (drv->remove)
125 drv->driver.remove = hdac_ext_drv_remove;
126 if (drv->shutdown)
127 drv->driver.shutdown = hdac_ext_drv_shutdown;
128
129 return driver_register(&drv->driver);
130 }
131 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
132
133 /**
134 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
135 *
136 * @drv: ext hda driver structure
137 */
138 void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
139 {
140 driver_unregister(&drv->driver);
141 }
142 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);
143
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