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Linux/sound/drivers/pcsp/pcsp.c

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  1 /*
  2  * PC-Speaker driver for Linux
  3  *
  4  * Copyright (C) 1997-2001  David Woodhouse
  5  * Copyright (C) 2001-2008  Stas Sergeev
  6  */
  7 
  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"
 18 #include "pcsp.h"
 19 
 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");
 25 
 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 */
 30 
 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.");
 39 
 40 struct snd_pcsp pcsp_chip;
 41 
 42 static int snd_pcsp_create(struct snd_card *card)
 43 {
 44         static struct snd_device_ops ops = { };
 45         struct timespec tp;
 46         int err;
 47         int div, min_div, order;
 48 
 49         hrtimer_get_res(CLOCK_MONOTONIC, &tp);
 50 
 51         if (!nopcm) {
 52                 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
 53                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
 54                                 "(%linS)\n", tp.tv_nsec);
 55                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
 56                                 "enabled.\n");
 57                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
 58                         nopcm = 1;
 59                 }
 60         }
 61 
 62         if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
 63                 min_div = MIN_DIV;
 64         else
 65                 min_div = MAX_DIV;
 66 #if PCSP_DEBUG
 67         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%li\n",
 68                loops_per_jiffy, min_div, tp.tv_nsec);
 69 #endif
 70 
 71         div = MAX_DIV / min_div;
 72         order = fls(div) - 1;
 73 
 74         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
 75         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
 76         pcsp_chip.playback_ptr = 0;
 77         pcsp_chip.period_ptr = 0;
 78         atomic_set(&pcsp_chip.timer_active, 0);
 79         pcsp_chip.enable = 1;
 80         pcsp_chip.pcspkr = 1;
 81 
 82         spin_lock_init(&pcsp_chip.substream_lock);
 83 
 84         pcsp_chip.card = card;
 85         pcsp_chip.port = 0x61;
 86         pcsp_chip.irq = -1;
 87         pcsp_chip.dma = -1;
 88 
 89         /* Register device */
 90         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
 91         if (err < 0)
 92                 return err;
 93 
 94         return 0;
 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_card_create(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                 snd_card_free(card);
115                 return err;
116         }
117         if (!nopcm) {
118                 err = snd_pcsp_new_pcm(&pcsp_chip);
119                 if (err < 0) {
120                         snd_card_free(card);
121                         return err;
122                 }
123         }
124         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
125         if (err < 0) {
126                 snd_card_free(card);
127                 return err;
128         }
129 
130         snd_card_set_dev(pcsp_chip.card, dev);
131 
132         strcpy(card->driver, "PC-Speaker");
133         strcpy(card->shortname, "pcsp");
134         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
135                 pcsp_chip.port);
136 
137         err = snd_card_register(card);
138         if (err < 0) {
139                 snd_card_free(card);
140                 return err;
141         }
142 
143         return 0;
144 }
145 
146 static int alsa_card_pcsp_init(struct device *dev)
147 {
148         int err;
149 
150         err = snd_card_pcsp_probe(0, dev);
151         if (err) {
152                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
153                 return err;
154         }
155 
156 #ifdef CONFIG_DEBUG_PAGEALLOC
157         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
158         printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
159                "which may make the sound noisy.\n");
160 #endif
161 
162         return 0;
163 }
164 
165 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
166 {
167         snd_card_free(chip->card);
168 }
169 
170 static int pcsp_probe(struct platform_device *dev)
171 {
172         int err;
173 
174         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
175         if (err < 0)
176                 return err;
177 
178         err = alsa_card_pcsp_init(&dev->dev);
179         if (err < 0) {
180                 pcspkr_input_remove(pcsp_chip.input_dev);
181                 return err;
182         }
183 
184         platform_set_drvdata(dev, &pcsp_chip);
185         return 0;
186 }
187 
188 static int pcsp_remove(struct platform_device *dev)
189 {
190         struct snd_pcsp *chip = platform_get_drvdata(dev);
191         pcspkr_input_remove(chip->input_dev);
192         alsa_card_pcsp_exit(chip);
193         return 0;
194 }
195 
196 static void pcsp_stop_beep(struct snd_pcsp *chip)
197 {
198         pcsp_sync_stop(chip);
199         pcspkr_stop_sound();
200 }
201 
202 #ifdef CONFIG_PM_SLEEP
203 static int pcsp_suspend(struct device *dev)
204 {
205         struct snd_pcsp *chip = dev_get_drvdata(dev);
206         pcsp_stop_beep(chip);
207         snd_pcm_suspend_all(chip->pcm);
208         return 0;
209 }
210 
211 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
212 #define PCSP_PM_OPS     &pcsp_pm
213 #else
214 #define PCSP_PM_OPS     NULL
215 #endif  /* CONFIG_PM_SLEEP */
216 
217 static void pcsp_shutdown(struct platform_device *dev)
218 {
219         struct snd_pcsp *chip = platform_get_drvdata(dev);
220         pcsp_stop_beep(chip);
221 }
222 
223 static struct platform_driver pcsp_platform_driver = {
224         .driver         = {
225                 .name   = "pcspkr",
226                 .owner  = THIS_MODULE,
227                 .pm     = PCSP_PM_OPS,
228         },
229         .probe          = pcsp_probe,
230         .remove         = pcsp_remove,
231         .shutdown       = pcsp_shutdown,
232 };
233 
234 static int __init pcsp_init(void)
235 {
236         if (!enable)
237                 return -ENODEV;
238         return platform_driver_register(&pcsp_platform_driver);
239 }
240 
241 static void __exit pcsp_exit(void)
242 {
243         platform_driver_unregister(&pcsp_platform_driver);
244 }
245 
246 module_init(pcsp_init);
247 module_exit(pcsp_exit);
248 

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