release/src-rt-6.x.4708/linux/linux-2.6.36/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 static int 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 __devinit 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         if (!nopcm) {
  50                 hrtimer_get_res(CLOCK_MONOTONIC, &tp);
  51                 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
  52                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
  53                                 "(%linS)\n", tp.tv_nsec);
  54                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
  55                                 "enabled.\n");
  56                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
  57                         nopcm = 1;
  58                 }
  59         }
  60
  61         if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
  62                 min_div = MIN_DIV;
  63         else
  64                 min_div = MAX_DIV;
  65 #if PCSP_DEBUG
  66         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%li\n",
  67                loops_per_jiffy, min_div, tp.tv_nsec);
  68 #endif
  69
  70         div = MAX_DIV / min_div;
  71         order = fls(div) - 1;
  72
  73         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
  74         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
  75         pcsp_chip.playback_ptr = 0;
  76         pcsp_chip.period_ptr = 0;
  77         atomic_set(&pcsp_chip.timer_active, 0);
  78         pcsp_chip.enable = 1;
  79         pcsp_chip.pcspkr = 1;
  80
  81         spin_lock_init(&pcsp_chip.substream_lock);
  82
  83         pcsp_chip.card = card;
  84         pcsp_chip.port = 0x61;
  85         pcsp_chip.irq = -1;
  86         pcsp_chip.dma = -1;
  87
  88         /* Register device */
  89         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
  90         if (err < 0)
  91                 return err;
  92
  93         return 0;
  94 }
  95
  96 static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
  97 {
  98         struct snd_card *card;
  99         int err;
 100
 101         if (devnum != 0)
 102                 return -EINVAL;
 103
 104         hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 105         pcsp_chip.timer.function = pcsp_do_timer;
 106
 107         err = snd_card_create(index, id, THIS_MODULE, 0, &card);
 108         if (err < 0)
 109                 return err;
 110
 111         err = snd_pcsp_create(card);
 112         if (err < 0) {
 113                 snd_card_free(card);
 114                 return err;
 115         }
 116         if (!nopcm) {
 117                 err = snd_pcsp_new_pcm(&pcsp_chip);
 118                 if (err < 0) {
 119                         snd_card_free(card);
 120                         return err;
 121                 }
 122         }
 123         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
 124         if (err < 0) {
 125                 snd_card_free(card);
 126                 return err;
 127         }
 128
 129         snd_card_set_dev(pcsp_chip.card, dev);
 130
 131         strcpy(card->driver, "PC-Speaker");
 132         strcpy(card->shortname, "pcsp");
 133         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
 134                 pcsp_chip.port);
 135
 136         err = snd_card_register(card);
 137         if (err < 0) {
 138                 snd_card_free(card);
 139                 return err;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static int __devinit alsa_card_pcsp_init(struct device *dev)
 146 {
 147         int err;
 148
 149         err = snd_card_pcsp_probe(0, dev);
 150         if (err) {
 151                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
 152                 return err;
 153         }
 154
 155 #ifdef CONFIG_DEBUG_PAGEALLOC
 156         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
 157         printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
 158                "which may make the sound noisy.\n");
 159 #endif
 160
 161         return 0;
 162 }
 163
 164 static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
 165 {
 166         snd_card_free(chip->card);
 167 }
 168
 169 static int __devinit pcsp_probe(struct platform_device *dev)
 170 {
 171         int err;
 172
 173         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
 174         if (err < 0)
 175                 return err;
 176
 177         err = alsa_card_pcsp_init(&dev->dev);
 178         if (err < 0) {
 179                 pcspkr_input_remove(pcsp_chip.input_dev);
 180                 return err;
 181         }
 182
 183         platform_set_drvdata(dev, &pcsp_chip);
 184         return 0;
 185 }
 186
 187 static int __devexit pcsp_remove(struct platform_device *dev)
 188 {
 189         struct snd_pcsp *chip = platform_get_drvdata(dev);
 190         alsa_card_pcsp_exit(chip);
 191         pcspkr_input_remove(chip->input_dev);
 192         platform_set_drvdata(dev, NULL);
 193         return 0;
 194 }
 195
 196 static void pcsp_stop_beep(struct snd_pcsp *chip)
 197 {
 198         pcsp_sync_stop(chip);
 199         pcspkr_stop_sound();
 200 }
 201
 202 #ifdef CONFIG_PM
 203 static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
 204 {
 205         struct snd_pcsp *chip = platform_get_drvdata(dev);
 206         pcsp_stop_beep(chip);
 207         snd_pcm_suspend_all(chip->pcm);
 208         return 0;
 209 }
 210 #else
 211 #define pcsp_suspend NULL
 212 #endif  /* CONFIG_PM */
 213
 214 static void pcsp_shutdown(struct platform_device *dev)
 215 {
 216         struct snd_pcsp *chip = platform_get_drvdata(dev);
 217         pcsp_stop_beep(chip);
 218 }
 219
 220 static struct platform_driver pcsp_platform_driver = {
 221         .driver         = {
 222                 .name   = "pcspkr",
 223                 .owner  = THIS_MODULE,
 224         },
 225         .probe          = pcsp_probe,
 226         .remove         = __devexit_p(pcsp_remove),
 227         .suspend        = pcsp_suspend,
 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);