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/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"
  17 #include "pcsp.h"
  18
  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");
  24
  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 */
  28
  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.");
  35
  36 struct snd_pcsp pcsp_chip;
  37
  38 static int __devinit snd_pcsp_create(struct snd_card *card)
  39 {
  40         static struct snd_device_ops ops = { };
  41         struct timespec tp;
  42         int err;
  43         int div, min_div, order;
  44
  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 "
  50                        "enabled.\n");
  51                 return -EIO;
  52         }
  53
  54         if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
  55                 min_div = MIN_DIV;
  56         else
  57                 min_div = MAX_DIV;
  58 #if PCSP_DEBUG
  59         printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
  60                loops_per_jiffy, min_div, tp.tv_nsec);
  61 #endif
  62
  63         div = MAX_DIV / min_div;
  64         order = fls(div) - 1;
  65
  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);
  71         pcsp_chip.enable = 1;
  72         pcsp_chip.pcspkr = 1;
  73
  74         spin_lock_init(&pcsp_chip.substream_lock);
  75
  76         pcsp_chip.card = card;
  77         pcsp_chip.port = 0x61;
  78         pcsp_chip.irq = -1;
  79         pcsp_chip.dma = -1;
  80
  81         /* Register device */
  82         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
  83         if (err < 0)
  84                 return err;
  85
  86         return 0;
  87 }
  88
  89 static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
  90 {
  91         struct snd_card *card;
  92         int err;
  93
  94         if (devnum != 0)
  95                 return -EINVAL;
  96
  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;
 100
 101         card = snd_card_new(index, id, THIS_MODULE, 0);
 102         if (!card)
 103                 return -ENOMEM;
 104
 105         err = snd_pcsp_create(card);
 106         if (err < 0) {
 107                 snd_card_free(card);
 108                 return err;
 109         }
 110         err = snd_pcsp_new_pcm(&pcsp_chip);
 111         if (err < 0) {
 112                 snd_card_free(card);
 113                 return err;
 114         }
 115         err = snd_pcsp_new_mixer(&pcsp_chip);
 116         if (err < 0) {
 117                 snd_card_free(card);
 118                 return err;
 119         }
 120
 121         snd_card_set_dev(pcsp_chip.card, dev);
 122
 123         strcpy(card->driver, "PC-Speaker");
 124         strcpy(card->shortname, "pcsp");
 125         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
 126                 pcsp_chip.port);
 127
 128         err = snd_card_register(card);
 129         if (err < 0) {
 130                 snd_card_free(card);
 131                 return err;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int __devinit alsa_card_pcsp_init(struct device *dev)
 138 {
 139         int err;
 140
 141         err = snd_card_pcsp_probe(0, dev);
 142         if (err) {
 143                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
 144                 return err;
 145         }
 146
 147 #ifdef CONFIG_DEBUG_PAGEALLOC
 148         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
 149         printk(KERN_WARNING
 150                "PCSP: Warning, CONFIG_DEBUG_PAGEALLOC is enabled!\n"
 151                "You have to disable it if you want to use the PC-Speaker "
 152                "driver.\n"
 153                "Unless it is disabled, enjoy the horrible, distorted "
 154                "and crackling noise.\n");
 155 #endif
 156
 157         return 0;
 158 }
 159
 160 static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
 161 {
 162         snd_card_free(chip->card);
 163 }
 164
 165 static int __devinit pcsp_probe(struct platform_device *dev)
 166 {
 167         int err;
 168
 169         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
 170         if (err < 0)
 171                 return err;
 172
 173         err = alsa_card_pcsp_init(&dev->dev);
 174         if (err < 0) {
 175                 pcspkr_input_remove(pcsp_chip.input_dev);
 176                 return err;
 177         }
 178
 179         platform_set_drvdata(dev, &pcsp_chip);
 180         return 0;
 181 }
 182
 183 static int __devexit pcsp_remove(struct platform_device *dev)
 184 {
 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);
 189         return 0;
 190 }
 191
 192 static void pcsp_stop_beep(struct snd_pcsp *chip)
 193 {
 194         spin_lock_irq(&chip->substream_lock);
 195         if (!chip->playback_substream)
 196                 pcspkr_stop_sound();
 197         spin_unlock_irq(&chip->substream_lock);
 198 }
 199
 200 static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
 201 {
 202         struct snd_pcsp *chip = platform_get_drvdata(dev);
 203         pcsp_stop_beep(chip);
 204         snd_pcm_suspend_all(chip->pcm);
 205         return 0;
 206 }
 207
 208 static void pcsp_shutdown(struct platform_device *dev)
 209 {
 210         struct snd_pcsp *chip = platform_get_drvdata(dev);
 211         pcsp_stop_beep(chip);
 212 }
 213
 214 static struct platform_driver pcsp_platform_driver = {
 215         .driver         = {
 216                 .name   = "pcspkr",
 217                 .owner  = THIS_MODULE,
 218         },
 219         .probe          = pcsp_probe,
 220         .remove         = __devexit_p(pcsp_remove),
 221         .suspend        = pcsp_suspend,
 222         .shutdown       = pcsp_shutdown,
 223 };
 224
 225 static int __init pcsp_init(void)
 226 {
 227         if (!enable)
 228                 return -ENODEV;
 229         return platform_driver_register(&pcsp_platform_driver);
 230 }
 231
 232 static void __exit pcsp_exit(void)
 233 {
 234         platform_driver_unregister(&pcsp_platform_driver);
 235 }
 236
 237 module_init(pcsp_init);
 238 module_exit(pcsp_exit);