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         unsigned int resolution = hrtimer_resolution;
  46         int err, div, min_div, order;
  47
  48         if (!nopcm) {
  49                 if (resolution > PCSP_MAX_PERIOD_NS) {
  50                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
  51                                 "(%unS)\n", resolution);
  52                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
  53                                 "enabled.\n");
  54                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
  55                         nopcm = 1;
  56                 }
  57         }
  58
  59         if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
  60                 min_div = MIN_DIV;
  61         else
  62                 min_div = MAX_DIV;
  63 #if PCSP_DEBUG
  64         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
  65                loops_per_jiffy, min_div, resolution);
  66 #endif
  67
  68         div = MAX_DIV / min_div;
  69         order = fls(div) - 1;
  70
  71         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
  72         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
  73         pcsp_chip.playback_ptr = 0;
  74         pcsp_chip.period_ptr = 0;
  75         atomic_set(&pcsp_chip.timer_active, 0);
  76         pcsp_chip.enable = 1;
  77         pcsp_chip.pcspkr = 1;
  78
  79         spin_lock_init(&pcsp_chip.substream_lock);
  80
  81         pcsp_chip.card = card;
  82         pcsp_chip.port = 0x61;
  83         pcsp_chip.irq = -1;
  84         pcsp_chip.dma = -1;
  85
  86         /* Register device */
  87         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
  88         if (err < 0)
  89                 return err;
  90
  91         return 0;
  92 }
  93
  94 static int snd_card_pcsp_probe(int devnum, struct device *dev)
  95 {
  96         struct snd_card *card;
  97         int err;
  98
  99         if (devnum != 0)
 100                 return -EINVAL;
 101
 102         hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 103         pcsp_chip.timer.function = pcsp_do_timer;
 104
 105         err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
 106         if (err < 0)
 107                 return err;
 108
 109         err = snd_pcsp_create(card);
 110         if (err < 0) {
 111                 snd_card_free(card);
 112                 return err;
 113         }
 114         if (!nopcm) {
 115                 err = snd_pcsp_new_pcm(&pcsp_chip);
 116                 if (err < 0) {
 117                         snd_card_free(card);
 118                         return err;
 119                 }
 120         }
 121         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
 122         if (err < 0) {
 123                 snd_card_free(card);
 124                 return err;
 125         }
 126
 127         strcpy(card->driver, "PC-Speaker");
 128         strcpy(card->shortname, "pcsp");
 129         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
 130                 pcsp_chip.port);
 131
 132         err = snd_card_register(card);
 133         if (err < 0) {
 134                 snd_card_free(card);
 135                 return err;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static int alsa_card_pcsp_init(struct device *dev)
 142 {
 143         int err;
 144
 145         err = snd_card_pcsp_probe(0, dev);
 146         if (err) {
 147                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
 148                 return err;
 149         }
 150
 151 #ifdef CONFIG_DEBUG_PAGEALLOC
 152         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
 153         printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
 154                "which may make the sound noisy.\n");
 155 #endif
 156
 157         return 0;
 158 }
 159
 160 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
 161 {
 162         snd_card_free(chip->card);
 163 }
 164
 165 static int 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 pcsp_remove(struct platform_device *dev)
 184 {
 185         struct snd_pcsp *chip = platform_get_drvdata(dev);
 186         pcspkr_input_remove(chip->input_dev);
 187         alsa_card_pcsp_exit(chip);
 188         return 0;
 189 }
 190
 191 static void pcsp_stop_beep(struct snd_pcsp *chip)
 192 {
 193         pcsp_sync_stop(chip);
 194         pcspkr_stop_sound();
 195 }
 196
 197 #ifdef CONFIG_PM_SLEEP
 198 static int pcsp_suspend(struct device *dev)
 199 {
 200         struct snd_pcsp *chip = dev_get_drvdata(dev);
 201         pcsp_stop_beep(chip);
 202         snd_pcm_suspend_all(chip->pcm);
 203         return 0;
 204 }
 205
 206 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
 207 #define PCSP_PM_OPS     &pcsp_pm
 208 #else
 209 #define PCSP_PM_OPS     NULL
 210 #endif  /* CONFIG_PM_SLEEP */
 211
 212 static void pcsp_shutdown(struct platform_device *dev)
 213 {
 214         struct snd_pcsp *chip = platform_get_drvdata(dev);
 215         pcsp_stop_beep(chip);
 216 }
 217
 218 static struct platform_driver pcsp_platform_driver = {
 219         .driver         = {
 220                 .name   = "pcspkr",
 221                 .pm     = PCSP_PM_OPS,
 222         },
 223         .probe          = pcsp_probe,
 224         .remove         = pcsp_remove,
 225         .shutdown       = pcsp_shutdown,
 226 };
 227
 228 static int __init pcsp_init(void)
 229 {
 230         if (!enable)
 231                 return -ENODEV;
 232         return platform_driver_register(&pcsp_platform_driver);
 233 }
 234
 235 static void __exit pcsp_exit(void)
 236 {
 237         platform_driver_unregister(&pcsp_platform_driver);
 238 }
 239
 240 module_init(pcsp_init);
 241 module_exit(pcsp_exit);