kernel/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 <linux/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                 .pm     = PCSP_PM_OPS,
 225         },
 226         .probe          = pcsp_probe,
 227         .remove         = pcsp_remove,
 228         .shutdown       = pcsp_shutdown,
 229 };
 230
 231 static int __init pcsp_init(void)
 232 {
 233         if (!enable)
 234                 return -ENODEV;
 235         return platform_driver_register(&pcsp_platform_driver);
 236 }
 237
 238 static void __exit pcsp_exit(void)
 239 {
 240         platform_driver_unregister(&pcsp_platform_driver);
 241 }
 242
 243 module_init(pcsp_init);
 244 module_exit(pcsp_exit);