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_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);