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Linux/sound/drivers/pcsp/pcsp.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * PC-Speaker driver for Linux
  4  *
  5  * Copyright (C) 1997-2001  David Woodhouse
  6  * Copyright (C) 2001-2008  Stas Sergeev
  7  */
  8 
  9 #include <linux/init.h>
 10 #include <linux/module.h>
 11 #include <linux/platform_device.h>
 12 #include <sound/core.h>
 13 #include <sound/initval.h>
 14 #include <sound/pcm.h>
 15 #include <linux/input.h>
 16 #include <linux/delay.h>
 17 #include <linux/bitops.h>
 18 #include <linux/mm.h>
 19 #include "pcsp_input.h"
 20 #include "pcsp.h"
 21 
 22 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
 23 MODULE_DESCRIPTION("PC-Speaker driver");
 24 MODULE_LICENSE("GPL");
 25 MODULE_ALIAS("platform:pcspkr");
 26 
 27 static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
 28 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
 29 static bool enable = SNDRV_DEFAULT_ENABLE1;     /* Enable this card */
 30 static bool nopcm;      /* Disable PCM capability of the driver */
 31 
 32 module_param(index, int, 0444);
 33 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
 34 module_param(id, charp, 0444);
 35 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
 36 module_param(enable, bool, 0444);
 37 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
 38 module_param(nopcm, bool, 0444);
 39 MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
 40 
 41 struct snd_pcsp pcsp_chip;
 42 
 43 static int snd_pcsp_create(struct snd_card *card)
 44 {
 45         unsigned int resolution = hrtimer_resolution;
 46         int div, min_div, order;
 47 
 48         if (!nopcm) {
 49                 if (resolution > PCSP_MAX_PERIOD_NS) {
 50                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
 51                                 "(%unS)\n", resolution);
 52                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
 53                                 "enabled.\n");
 54                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
 55                         nopcm = 1;
 56                 }
 57         }
 58 
 59         if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
 60                 min_div = MIN_DIV;
 61         else
 62                 min_div = MAX_DIV;
 63 #if PCSP_DEBUG
 64         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
 65                loops_per_jiffy, min_div, resolution);
 66 #endif
 67 
 68         div = MAX_DIV / min_div;
 69         order = fls(div) - 1;
 70 
 71         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
 72         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
 73         pcsp_chip.playback_ptr = 0;
 74         pcsp_chip.period_ptr = 0;
 75         atomic_set(&pcsp_chip.timer_active, 0);
 76         pcsp_chip.enable = 1;
 77         pcsp_chip.pcspkr = 1;
 78 
 79         spin_lock_init(&pcsp_chip.substream_lock);
 80 
 81         pcsp_chip.card = card;
 82         pcsp_chip.port = 0x61;
 83         pcsp_chip.irq = -1;
 84         pcsp_chip.dma = -1;
 85         card->private_data = &pcsp_chip;
 86 
 87         return 0;
 88 }
 89 
 90 static void pcsp_stop_beep(struct snd_pcsp *chip);
 91 
 92 static void alsa_card_pcsp_free(struct snd_card *card)
 93 {
 94         pcsp_stop_beep(card->private_data);
 95 }
 96 
 97 static int snd_card_pcsp_probe(int devnum, struct device *dev)
 98 {
 99         struct snd_card *card;
100         int err;
101 
102         if (devnum != 0)
103                 return -EINVAL;
104 
105         hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
106         pcsp_chip.timer.function = pcsp_do_timer;
107 
108         err = snd_devm_card_new(dev, index, id, THIS_MODULE, 0, &card);
109         if (err < 0)
110                 return err;
111 
112         err = snd_pcsp_create(card);
113         if (err < 0)
114                 return err;
115 
116         if (!nopcm) {
117                 err = snd_pcsp_new_pcm(&pcsp_chip);
118                 if (err < 0)
119                         return err;
120         }
121         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
122         if (err < 0)
123                 return err;
124 
125         strcpy(card->driver, "PC-Speaker");
126         strcpy(card->shortname, "pcsp");
127         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
128                 pcsp_chip.port);
129 
130         err = snd_card_register(card);
131         if (err < 0)
132                 return err;
133         card->private_free = alsa_card_pcsp_free;
134 
135         return 0;
136 }
137 
138 static int alsa_card_pcsp_init(struct device *dev)
139 {
140         int err;
141 
142         err = snd_card_pcsp_probe(0, dev);
143         if (err) {
144                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
145                 return err;
146         }
147 
148         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
149         if (debug_pagealloc_enabled()) {
150                 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
151                        "which may make the sound noisy.\n");
152         }
153 
154         return 0;
155 }
156 
157 static int pcsp_probe(struct platform_device *dev)
158 {
159         int err;
160 
161         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
162         if (err < 0)
163                 return err;
164 
165         err = alsa_card_pcsp_init(&dev->dev);
166         if (err < 0)
167                 return err;
168 
169         platform_set_drvdata(dev, &pcsp_chip);
170         return 0;
171 }
172 
173 static void pcsp_stop_beep(struct snd_pcsp *chip)
174 {
175         pcsp_sync_stop(chip);
176         pcspkr_stop_sound();
177 }
178 
179 static int pcsp_suspend(struct device *dev)
180 {
181         struct snd_pcsp *chip = dev_get_drvdata(dev);
182         pcsp_stop_beep(chip);
183         return 0;
184 }
185 
186 static DEFINE_SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
187 
188 static void pcsp_shutdown(struct platform_device *dev)
189 {
190         struct snd_pcsp *chip = platform_get_drvdata(dev);
191         pcsp_stop_beep(chip);
192 }
193 
194 static struct platform_driver pcsp_platform_driver = {
195         .driver         = {
196                 .name   = "pcspkr",
197                 .pm     = &pcsp_pm,
198         },
199         .probe          = pcsp_probe,
200         .shutdown       = pcsp_shutdown,
201 };
202 
203 static int __init pcsp_init(void)
204 {
205         if (!enable)
206                 return -ENODEV;
207         return platform_driver_register(&pcsp_platform_driver);
208 }
209 
210 static void __exit pcsp_exit(void)
211 {
212         platform_driver_unregister(&pcsp_platform_driver);
213 }
214 
215 module_init(pcsp_init);
216 module_exit(pcsp_exit);
217 

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