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Linux/sound/drivers/pcsp/pcsp.c

  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_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                 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         strcpy(card->driver, "PC-Speaker");
131         strcpy(card->shortname, "pcsp");
132         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
133                 pcsp_chip.port);
134 
135         err = snd_card_register(card);
136         if (err < 0) {
137                 snd_card_free(card);
138                 return err;
139         }
140 
141         return 0;
142 }
143 
144 static int alsa_card_pcsp_init(struct device *dev)
145 {
146         int err;
147 
148         err = snd_card_pcsp_probe(0, dev);
149         if (err) {
150                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
151                 return err;
152         }
153 
154 #ifdef CONFIG_DEBUG_PAGEALLOC
155         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
156         printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
157                "which may make the sound noisy.\n");
158 #endif
159 
160         return 0;
161 }
162 
163 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
164 {
165         snd_card_free(chip->card);
166 }
167 
168 static int pcsp_probe(struct platform_device *dev)
169 {
170         int err;
171 
172         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
173         if (err < 0)
174                 return err;
175 
176         err = alsa_card_pcsp_init(&dev->dev);
177         if (err < 0) {
178                 pcspkr_input_remove(pcsp_chip.input_dev);
179                 return err;
180         }
181 
182         platform_set_drvdata(dev, &pcsp_chip);
183         return 0;
184 }
185 
186 static int pcsp_remove(struct platform_device *dev)
187 {
188         struct snd_pcsp *chip = platform_get_drvdata(dev);
189         pcspkr_input_remove(chip->input_dev);
190         alsa_card_pcsp_exit(chip);
191         return 0;
192 }
193 
194 static void pcsp_stop_beep(struct snd_pcsp *chip)
195 {
196         pcsp_sync_stop(chip);
197         pcspkr_stop_sound();
198 }
199 
200 #ifdef CONFIG_PM_SLEEP
201 static int pcsp_suspend(struct device *dev)
202 {
203         struct snd_pcsp *chip = dev_get_drvdata(dev);
204         pcsp_stop_beep(chip);
205         snd_pcm_suspend_all(chip->pcm);
206         return 0;
207 }
208 
209 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
210 #define PCSP_PM_OPS     &pcsp_pm
211 #else
212 #define PCSP_PM_OPS     NULL
213 #endif  /* CONFIG_PM_SLEEP */
214 
215 static void pcsp_shutdown(struct platform_device *dev)
216 {
217         struct snd_pcsp *chip = platform_get_drvdata(dev);
218         pcsp_stop_beep(chip);
219 }
220 
221 static struct platform_driver pcsp_platform_driver = {
222         .driver         = {
223                 .name   = "pcspkr",
224                 .owner  = THIS_MODULE,
225                 .pm     = PCSP_PM_OPS,
226         },
227         .probe          = pcsp_probe,
228         .remove         = pcsp_remove,
229         .shutdown       = pcsp_shutdown,
230 };
231 
232 static int __init pcsp_init(void)
233 {
234         if (!enable)
235                 return -ENODEV;
236         return platform_driver_register(&pcsp_platform_driver);
237 }
238 
239 static void __exit pcsp_exit(void)
240 {
241         platform_driver_unregister(&pcsp_platform_driver);
242 }
243 
244 module_init(pcsp_init);
245 module_exit(pcsp_exit);
246 

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