kernel/2.6.29.6-aldebaran-rt/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/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
  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 int enable = SNDRV_DEFAULT_ENABLE1;      /* Enable this card */
  29
  30 module_param(index, int, 0444);
  31 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
  32 module_param(id, charp, 0444);
  33 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
  34 module_param(enable, bool, 0444);
  35 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
  36
  37 struct snd_pcsp pcsp_chip;
  38
  39 static 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
  90 static 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
 137 static 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
 156 static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
 157 {
 158         snd_card_free(chip->card);
 159 }
 160
 161 static 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
 179 static 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
 188 static void pcsp_stop_beep(struct snd_pcsp *chip)
 189 {
 190         pcsp_sync_stop(chip);
 191         pcspkr_stop_sound();
 192 }
 193
 194 #ifdef CONFIG_PM
 195 static 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
 206 static void pcsp_shutdown(struct platform_device *dev)
 207 {
 208         struct snd_pcsp *chip = platform_get_drvdata(dev);
 209         pcsp_stop_beep(chip);
 210 }
 211
 212 static 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
 223 static int __init pcsp_init(void)
 224 {
 225         if (!enable)
 226                 return -ENODEV;
 227         return platform_driver_register(&pcsp_platform_driver);
 228 }
 229
 230 static void __exit pcsp_exit(void)
 231 {
 232         platform_driver_unregister(&pcsp_platform_driver);
 233 }
 234
 235 module_init(pcsp_init);
 236 module_exit(pcsp_exit);