linux/sound/drivers/pcsp/pcsp.c
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   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 <linux/delay.h>
  16#include <asm/bitops.h>
  17#include "pcsp_input.h"
  18#include "pcsp.h"
  19
  20MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
  21MODULE_DESCRIPTION("PC-Speaker driver");
  22MODULE_LICENSE("GPL");
  23MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
  24MODULE_ALIAS("platform:pcspkr");
  25
  26static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
  27static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  28static int enable = SNDRV_DEFAULT_ENABLE1;      /* Enable this card */
  29
  30module_param(index, int, 0444);
  31MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
  32module_param(id, charp, 0444);
  33MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
  34module_param(enable, bool, 0444);
  35MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
  36
  37struct snd_pcsp pcsp_chip;
  38
  39static int __devinit snd_pcsp_create(struct snd_card *card)
  40{
  41        static struct snd_device_ops ops = { };
  42        struct timespec tp;
  43        int err;
  44        int div, min_div, order;
  45
  46        hrtimer_get_res(CLOCK_MONOTONIC, &tp);
  47        if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
  48                printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
  49                       "(%linS)\n", tp.tv_nsec);
  50                printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
  51                       "enabled.\n");
  52                return -EIO;
  53        }
  54
  55        if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
  56                min_div = MIN_DIV;
  57        else
  58                min_div = MAX_DIV;
  59#if PCSP_DEBUG
  60        printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
  61               loops_per_jiffy, min_div, tp.tv_nsec);
  62#endif
  63
  64        div = MAX_DIV / min_div;
  65        order = fls(div) - 1;
  66
  67        pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
  68        pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
  69        pcsp_chip.playback_ptr = 0;
  70        pcsp_chip.period_ptr = 0;
  71        atomic_set(&pcsp_chip.timer_active, 0);
  72        pcsp_chip.enable = 1;
  73        pcsp_chip.pcspkr = 1;
  74
  75        spin_lock_init(&pcsp_chip.substream_lock);
  76
  77        pcsp_chip.card = card;
  78        pcsp_chip.port = 0x61;
  79        pcsp_chip.irq = -1;
  80        pcsp_chip.dma = -1;
  81
  82        /* Register device */
  83        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
  84        if (err < 0)
  85                return err;
  86
  87        return 0;
  88}
  89
  90static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
  91{
  92        struct snd_card *card;
  93        int err;
  94
  95        if (devnum != 0)
  96                return -EINVAL;
  97
  98        hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
  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
 137static 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 "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
 150               "which may make the sound noisy.\n");
 151#endif
 152
 153        return 0;
 154}
 155
 156static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
 157{
 158        snd_card_free(chip->card);
 159}
 160
 161static int __devinit pcsp_probe(struct platform_device *dev)
 162{
 163        int err;
 164
 165        err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
 166        if (err < 0)
 167                return err;
 168
 169        err = alsa_card_pcsp_init(&dev->dev);
 170        if (err < 0) {
 171                pcspkr_input_remove(pcsp_chip.input_dev);
 172                return err;
 173        }
 174
 175        platform_set_drvdata(dev, &pcsp_chip);
 176        return 0;
 177}
 178
 179static int __devexit pcsp_remove(struct platform_device *dev)
 180{
 181        struct snd_pcsp *chip = platform_get_drvdata(dev);
 182        alsa_card_pcsp_exit(chip);
 183        pcspkr_input_remove(chip->input_dev);
 184        platform_set_drvdata(dev, NULL);
 185        return 0;
 186}
 187
 188static void pcsp_stop_beep(struct snd_pcsp *chip)
 189{
 190        pcsp_sync_stop(chip);
 191        pcspkr_stop_sound();
 192}
 193
 194#ifdef CONFIG_PM
 195static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
 196{
 197        struct snd_pcsp *chip = platform_get_drvdata(dev);
 198        pcsp_stop_beep(chip);
 199        snd_pcm_suspend_all(chip->pcm);
 200        return 0;
 201}
 202#else
 203#define pcsp_suspend NULL
 204#endif  /* CONFIG_PM */
 205
 206static void pcsp_shutdown(struct platform_device *dev)
 207{
 208        struct snd_pcsp *chip = platform_get_drvdata(dev);
 209        pcsp_stop_beep(chip);
 210}
 211
 212static struct platform_driver pcsp_platform_driver = {
 213        .driver         = {
 214                .name   = "pcspkr",
 215                .owner  = THIS_MODULE,
 216        },
 217        .probe          = pcsp_probe,
 218        .remove         = __devexit_p(pcsp_remove),
 219        .suspend        = pcsp_suspend,
 220        .shutdown       = pcsp_shutdown,
 221};
 222
 223static int __init pcsp_init(void)
 224{
 225        if (!enable)
 226                return -ENODEV;
 227        return platform_driver_register(&pcsp_platform_driver);
 228}
 229
 230static void __exit pcsp_exit(void)
 231{
 232        platform_driver_unregister(&pcsp_platform_driver);
 233}
 234
 235module_init(pcsp_init);
 236module_exit(pcsp_exit);
 237