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/module.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 <linux/delay.h>
16 #include <asm/bitops.h>
17 #include "pcsp_input.h"
20 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
21 MODULE_DESCRIPTION("PC-Speaker driver");
22 MODULE_LICENSE("GPL");
23 MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
24 MODULE_ALIAS("platform:pcspkr");
26 static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */
27 static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
28 static bool enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
29 static bool nopcm; /* Disable PCM capability of the driver */
31 module_param(index, int, 0444);
32 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
33 module_param(id, charp, 0444);
34 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
35 module_param(enable, bool, 0444);
36 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
37 module_param(nopcm, bool, 0444);
38 MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
40 struct snd_pcsp pcsp_chip;
42 static int snd_pcsp_create(struct snd_card *card)
44 static struct snd_device_ops ops = { };
47 int div, min_div, order;
50 hrtimer_get_res(CLOCK_MONOTONIC, &tp);
51 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
52 printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
53 "(%linS)\n", tp.tv_nsec);
54 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
56 printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
61 if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
66 printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%li\n",
67 loops_per_jiffy, min_div, tp.tv_nsec);
70 div = MAX_DIV / min_div;
73 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
74 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
75 pcsp_chip.playback_ptr = 0;
76 pcsp_chip.period_ptr = 0;
77 atomic_set(&pcsp_chip.timer_active, 0);
81 spin_lock_init(&pcsp_chip.substream_lock);
83 pcsp_chip.card = card;
84 pcsp_chip.port = 0x61;
89 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
96 static int snd_card_pcsp_probe(int devnum, struct device *dev)
98 struct snd_card *card;
104 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
105 pcsp_chip.timer.function = pcsp_do_timer;
107 err = snd_card_create(index, id, THIS_MODULE, 0, &card);
111 err = snd_pcsp_create(card);
117 err = snd_pcsp_new_pcm(&pcsp_chip);
123 err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
129 snd_card_set_dev(pcsp_chip.card, dev);
131 strcpy(card->driver, "PC-Speaker");
132 strcpy(card->shortname, "pcsp");
133 sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
136 err = snd_card_register(card);
145 static int alsa_card_pcsp_init(struct device *dev)
149 err = snd_card_pcsp_probe(0, dev);
151 printk(KERN_ERR "PC-Speaker initialization failed.\n");
155 #ifdef CONFIG_DEBUG_PAGEALLOC
156 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
157 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
158 "which may make the sound noisy.\n");
164 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
166 snd_card_free(chip->card);
169 static int pcsp_probe(struct platform_device *dev)
173 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
177 err = alsa_card_pcsp_init(&dev->dev);
179 pcspkr_input_remove(pcsp_chip.input_dev);
183 platform_set_drvdata(dev, &pcsp_chip);
187 static int pcsp_remove(struct platform_device *dev)
189 struct snd_pcsp *chip = platform_get_drvdata(dev);
190 alsa_card_pcsp_exit(chip);
191 pcspkr_input_remove(chip->input_dev);
192 platform_set_drvdata(dev, NULL);
196 static void pcsp_stop_beep(struct snd_pcsp *chip)
198 pcsp_sync_stop(chip);
202 #ifdef CONFIG_PM_SLEEP
203 static int pcsp_suspend(struct device *dev)
205 struct snd_pcsp *chip = dev_get_drvdata(dev);
206 pcsp_stop_beep(chip);
207 snd_pcm_suspend_all(chip->pcm);
211 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
212 #define PCSP_PM_OPS &pcsp_pm
214 #define PCSP_PM_OPS NULL
215 #endif /* CONFIG_PM_SLEEP */
217 static void pcsp_shutdown(struct platform_device *dev)
219 struct snd_pcsp *chip = platform_get_drvdata(dev);
220 pcsp_stop_beep(chip);
223 static struct platform_driver pcsp_platform_driver = {
226 .owner = THIS_MODULE,
230 .remove = pcsp_remove,
231 .shutdown = pcsp_shutdown,
234 static int __init pcsp_init(void)
238 return platform_driver_register(&pcsp_platform_driver);
241 static void __exit pcsp_exit(void)
243 platform_driver_unregister(&pcsp_platform_driver);
246 module_init(pcsp_init);
247 module_exit(pcsp_exit);