2 * PC-Speaker driver for Linux
4 * Copyright (C) 1997-2001 David Woodhouse
5 * Copyright (C) 2001-2008 Stas Sergeev
8 #include <linux/init.h>
9 #include <linux/moduleparam.h>
10 #include <linux/platform_device.h>
11 #include <sound/core.h>
12 #include <sound/initval.h>
13 #include <sound/pcm.h>
14 #include <linux/input.h>
15 #include <asm/bitops.h>
16 #include "pcsp_input.h"
19 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
20 MODULE_DESCRIPTION("PC-Speaker driver");
21 MODULE_LICENSE("GPL");
22 MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
23 MODULE_ALIAS("platform:pcspkr");
25 static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */
26 static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
27 static int enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
29 module_param(index, int, 0444);
30 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
31 module_param(id, charp, 0444);
32 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
33 module_param(enable, bool, 0444);
34 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
36 struct snd_pcsp pcsp_chip;
38 static int __devinit snd_pcsp_create(struct snd_card *card)
40 static struct snd_device_ops ops = { };
43 int div, min_div, order;
45 hrtimer_get_res(CLOCK_MONOTONIC, &tp);
46 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
47 printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
48 "(%linS)\n", tp.tv_nsec);
49 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
54 if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
59 printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
60 loops_per_jiffy, min_div, tp.tv_nsec);
63 div = MAX_DIV / min_div;
66 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
67 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
68 pcsp_chip.playback_ptr = 0;
69 pcsp_chip.period_ptr = 0;
70 atomic_set(&pcsp_chip.timer_active, 0);
74 spin_lock_init(&pcsp_chip.substream_lock);
76 pcsp_chip.card = card;
77 pcsp_chip.port = 0x61;
82 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
89 static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
91 struct snd_card *card;
97 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
98 pcsp_chip.timer.cb_mode = HRTIMER_CB_IRQSAFE;
99 pcsp_chip.timer.function = pcsp_do_timer;
101 card = snd_card_new(index, id, THIS_MODULE, 0);
105 err = snd_pcsp_create(card);
110 err = snd_pcsp_new_pcm(&pcsp_chip);
115 err = snd_pcsp_new_mixer(&pcsp_chip);
121 snd_card_set_dev(pcsp_chip.card, dev);
123 strcpy(card->driver, "PC-Speaker");
124 strcpy(card->shortname, "pcsp");
125 sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
128 err = snd_card_register(card);
137 static int __devinit alsa_card_pcsp_init(struct device *dev)
141 err = snd_card_pcsp_probe(0, dev);
143 printk(KERN_ERR "PC-Speaker initialization failed.\n");
147 #ifdef CONFIG_DEBUG_PAGEALLOC
148 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
150 "PCSP: Warning, CONFIG_DEBUG_PAGEALLOC is enabled!\n"
151 "You have to disable it if you want to use the PC-Speaker "
153 "Unless it is disabled, enjoy the horrible, distorted "
154 "and crackling noise.\n");
160 static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
162 snd_card_free(chip->card);
165 static int __devinit pcsp_probe(struct platform_device *dev)
169 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
173 err = alsa_card_pcsp_init(&dev->dev);
175 pcspkr_input_remove(pcsp_chip.input_dev);
179 platform_set_drvdata(dev, &pcsp_chip);
183 static int __devexit pcsp_remove(struct platform_device *dev)
185 struct snd_pcsp *chip = platform_get_drvdata(dev);
186 alsa_card_pcsp_exit(chip);
187 pcspkr_input_remove(chip->input_dev);
188 platform_set_drvdata(dev, NULL);
192 static void pcsp_stop_beep(struct snd_pcsp *chip)
195 spin_lock_irqsave(&chip->substream_lock, flags);
196 if (!chip->playback_substream)
198 spin_unlock_irqrestore(&chip->substream_lock, flags);
201 static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
203 struct snd_pcsp *chip = platform_get_drvdata(dev);
204 pcsp_stop_beep(chip);
205 snd_pcm_suspend_all(chip->pcm);
209 static void pcsp_shutdown(struct platform_device *dev)
211 struct snd_pcsp *chip = platform_get_drvdata(dev);
212 pcsp_stop_beep(chip);
215 static struct platform_driver pcsp_platform_driver = {
218 .owner = THIS_MODULE,
221 .remove = __devexit_p(pcsp_remove),
222 .suspend = pcsp_suspend,
223 .shutdown = pcsp_shutdown,
226 static int __init pcsp_init(void)
230 return platform_driver_register(&pcsp_platform_driver);
233 static void __exit pcsp_exit(void)
235 platform_driver_unregister(&pcsp_platform_driver);
238 module_init(pcsp_init);
239 module_exit(pcsp_exit);