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 <linux/mm.h>
  18 #include "pcsp_input.h"
  19 #include "pcsp.h"
  20
  21 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
  22 MODULE_DESCRIPTION("PC-Speaker driver");
  23 MODULE_LICENSE("GPL");
  24 MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
  25 MODULE_ALIAS("platform:pcspkr");
  26
  27 static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
  28 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  29 static bool enable = SNDRV_DEFAULT_ENABLE1;     /* Enable this card */
  30 static bool nopcm;      /* Disable PCM capability of the driver */
  31
  32 module_param(index, int, 0444);
  33 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
  34 module_param(id, charp, 0444);
  35 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
  36 module_param(enable, bool, 0444);
  37 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
  38 module_param(nopcm, bool, 0444);
  39 MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
  40
  41 struct snd_pcsp pcsp_chip;
  42
  43 static int snd_pcsp_create(struct snd_card *card)
  44 {
  45         static struct snd_device_ops ops = { };
  46         unsigned int resolution = hrtimer_resolution;
  47         int err, div, min_div, order;
  48
  49         if (!nopcm) {
  50                 if (resolution > PCSP_MAX_PERIOD_NS) {
  51                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
  52                                 "(%unS)\n", resolution);
  53                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
  54                                 "enabled.\n");
  55                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
  56                         nopcm = 1;
  57                 }
  58         }
  59
  60         if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
  61                 min_div = MIN_DIV;
  62         else
  63                 min_div = MAX_DIV;
  64 #if PCSP_DEBUG
  65         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
  66                loops_per_jiffy, min_div, resolution);
  67 #endif
  68
  69         div = MAX_DIV / min_div;
  70         order = fls(div) - 1;
  71
  72         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
  73         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
  74         pcsp_chip.playback_ptr = 0;
  75         pcsp_chip.period_ptr = 0;
  76         atomic_set(&pcsp_chip.timer_active, 0);
  77         pcsp_chip.enable = 1;
  78         pcsp_chip.pcspkr = 1;
  79
  80         spin_lock_init(&pcsp_chip.substream_lock);
  81
  82         pcsp_chip.card = card;
  83         pcsp_chip.port = 0x61;
  84         pcsp_chip.irq = -1;
  85         pcsp_chip.dma = -1;
  86
  87         /* Register device */
  88         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
  89         if (err < 0)
  90                 return err;
  91
  92         return 0;
  93 }
  94
  95 static int snd_card_pcsp_probe(int devnum, struct device *dev)
  96 {
  97         struct snd_card *card;
  98         int err;
  99
 100         if (devnum != 0)
 101                 return -EINVAL;
 102
 103         hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 104         pcsp_chip.timer.function = pcsp_do_timer;
 105
 106         err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
 107         if (err < 0)
 108                 return err;
 109
 110         err = snd_pcsp_create(card);
 111         if (err < 0) {
 112                 snd_card_free(card);
 113                 return err;
 114         }
 115         if (!nopcm) {
 116                 err = snd_pcsp_new_pcm(&pcsp_chip);
 117                 if (err < 0) {
 118                         snd_card_free(card);
 119                         return err;
 120                 }
 121         }
 122         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
 123         if (err < 0) {
 124                 snd_card_free(card);
 125                 return err;
 126         }
 127
 128         strcpy(card->driver, "PC-Speaker");
 129         strcpy(card->shortname, "pcsp");
 130         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
 131                 pcsp_chip.port);
 132
 133         err = snd_card_register(card);
 134         if (err < 0) {
 135                 snd_card_free(card);
 136                 return err;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int alsa_card_pcsp_init(struct device *dev)
 143 {
 144         int err;
 145
 146         err = snd_card_pcsp_probe(0, dev);
 147         if (err) {
 148                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
 149                 return err;
 150         }
 151
 152         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
 153         if (debug_pagealloc_enabled()) {
 154                 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
 155                        "which may make the sound noisy.\n");
 156         }
 157
 158         return 0;
 159 }
 160
 161 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
 162 {
 163         snd_card_free(chip->card);
 164 }
 165
 166 static int pcsp_probe(struct platform_device *dev)
 167 {
 168         int err;
 169
 170         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
 171         if (err < 0)
 172                 return err;
 173
 174         err = alsa_card_pcsp_init(&dev->dev);
 175         if (err < 0) {
 176                 pcspkr_input_remove(pcsp_chip.input_dev);
 177                 return err;
 178         }
 179
 180         platform_set_drvdata(dev, &pcsp_chip);
 181         return 0;
 182 }
 183
 184 static int pcsp_remove(struct platform_device *dev)
 185 {
 186         struct snd_pcsp *chip = platform_get_drvdata(dev);
 187         pcspkr_input_remove(chip->input_dev);
 188         alsa_card_pcsp_exit(chip);
 189         return 0;
 190 }
 191
 192 static void pcsp_stop_beep(struct snd_pcsp *chip)
 193 {
 194         pcsp_sync_stop(chip);
 195         pcspkr_stop_sound();
 196 }
 197
 198 #ifdef CONFIG_PM_SLEEP
 199 static int pcsp_suspend(struct device *dev)
 200 {
 201         struct snd_pcsp *chip = dev_get_drvdata(dev);
 202         pcsp_stop_beep(chip);
 203         snd_pcm_suspend_all(chip->pcm);
 204         return 0;
 205 }
 206
 207 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
 208 #define PCSP_PM_OPS     &pcsp_pm
 209 #else
 210 #define PCSP_PM_OPS     NULL
 211 #endif  /* CONFIG_PM_SLEEP */
 212
 213 static void pcsp_shutdown(struct platform_device *dev)
 214 {
 215         struct snd_pcsp *chip = platform_get_drvdata(dev);
 216         pcsp_stop_beep(chip);
 217 }
 218
 219 static struct platform_driver pcsp_platform_driver = {
 220         .driver         = {
 221                 .name   = "pcspkr",
 222                 .pm     = PCSP_PM_OPS,
 223         },
 224         .probe          = pcsp_probe,
 225         .remove         = pcsp_remove,
 226         .shutdown       = pcsp_shutdown,
 227 };
 228
 229 static int __init pcsp_init(void)
 230 {
 231         if (!enable)
 232                 return -ENODEV;
 233         return platform_driver_register(&pcsp_platform_driver);
 234 }
 235
 236 static void __exit pcsp_exit(void)
 237 {
 238         platform_driver_unregister(&pcsp_platform_driver);
 239 }
 240
 241 module_init(pcsp_init);
 242 module_exit(pcsp_exit);