release/src-rt-6.x.4708/linux/linux-2.6.36/sound/oss/dev_table.c

   1 /*
   2  * sound/oss/dev_table.c
   3  *
   4  * Device call tables.
   5  *
   6  *
   7  * Copyright (C) by Hannu Savolainen 1993-1997
   8  *
   9  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
  10  * Version 2 (June 1991). See the "COPYING" file distributed with this software
  11  * for more info.
  12  */
  13
  14 #include <linux/init.h>
  15
  16 #include "sound_config.h"
  17
  18 struct audio_operations *audio_devs[MAX_AUDIO_DEV];
  19 EXPORT_SYMBOL(audio_devs);
  20
  21 int num_audiodevs;
  22 EXPORT_SYMBOL(num_audiodevs);
  23
  24 struct mixer_operations *mixer_devs[MAX_MIXER_DEV];
  25 EXPORT_SYMBOL(mixer_devs);
  26
  27 int num_mixers;
  28 EXPORT_SYMBOL(num_mixers);
  29
  30 struct synth_operations *synth_devs[MAX_SYNTH_DEV+MAX_MIDI_DEV];
  31 EXPORT_SYMBOL(synth_devs);
  32
  33 int num_synths;
  34
  35 struct midi_operations *midi_devs[MAX_MIDI_DEV];
  36 EXPORT_SYMBOL(midi_devs);
  37
  38 int num_midis;
  39 EXPORT_SYMBOL(num_midis);
  40
  41 struct sound_timer_operations *sound_timer_devs[MAX_TIMER_DEV] = {
  42         &default_sound_timer, NULL
  43 };
  44 EXPORT_SYMBOL(sound_timer_devs);
  45
  46 int num_sound_timers = 1;
  47
  48
  49 static int sound_alloc_audiodev(void);
  50
  51 int sound_install_audiodrv(int vers, char *name, struct audio_driver *driver,
  52                         int driver_size, int flags, unsigned int format_mask,
  53                         void *devc, int dma1, int dma2)
  54 {
  55         struct audio_driver *d;
  56         struct audio_operations *op;
  57         int num;
  58
  59         if (vers != AUDIO_DRIVER_VERSION || driver_size > sizeof(struct audio_driver)) {
  60                 printk(KERN_ERR "Sound: Incompatible audio driver for %s\n", name);
  61                 return -(EINVAL);
  62         }
  63         num = sound_alloc_audiodev();
  64
  65         if (num == -1) {
  66                 printk(KERN_ERR "sound: Too many audio drivers\n");
  67                 return -(EBUSY);
  68         }
  69         d = (struct audio_driver *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_driver)));
  70         sound_nblocks++;
  71         if (sound_nblocks >= MAX_MEM_BLOCKS)
  72                 sound_nblocks = MAX_MEM_BLOCKS - 1;
  73
  74         op = (struct audio_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_operations)));
  75         sound_nblocks++;
  76         if (sound_nblocks >= MAX_MEM_BLOCKS)
  77                 sound_nblocks = MAX_MEM_BLOCKS - 1;
  78
  79         if (d == NULL || op == NULL) {
  80                 printk(KERN_ERR "Sound: Can't allocate driver for (%s)\n", name);
  81                 sound_unload_audiodev(num);
  82                 return -(ENOMEM);
  83         }
  84         memset((char *) op, 0, sizeof(struct audio_operations));
  85         init_waitqueue_head(&op->in_sleeper);
  86         init_waitqueue_head(&op->out_sleeper);
  87         init_waitqueue_head(&op->poll_sleeper);
  88         if (driver_size < sizeof(struct audio_driver))
  89                 memset((char *) d, 0, sizeof(struct audio_driver));
  90
  91         memcpy((char *) d, (char *) driver, driver_size);
  92
  93         op->d = d;
  94         strlcpy(op->name, name, sizeof(op->name));
  95         op->flags = flags;
  96         op->format_mask = format_mask;
  97         op->devc = devc;
  98
  99         /*
 100          *    Hardcoded defaults
 101          */
 102         audio_devs[num] = op;
 103
 104         DMAbuf_init(num, dma1, dma2);
 105
 106         audio_init_devices();
 107         return num;
 108 }
 109 EXPORT_SYMBOL(sound_install_audiodrv);
 110
 111 int sound_install_mixer(int vers, char *name, struct mixer_operations *driver,
 112         int driver_size, void *devc)
 113 {
 114         struct mixer_operations *op;
 115
 116         int n = sound_alloc_mixerdev();
 117
 118         if (n == -1) {
 119                 printk(KERN_ERR "Sound: Too many mixer drivers\n");
 120                 return -EBUSY;
 121         }
 122         if (vers != MIXER_DRIVER_VERSION ||
 123                 driver_size > sizeof(struct mixer_operations)) {
 124                 printk(KERN_ERR "Sound: Incompatible mixer driver for %s\n", name);
 125                 return -EINVAL;
 126         }
 127
 128
 129         op = (struct mixer_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct mixer_operations)));
 130         sound_nblocks++;
 131         if (sound_nblocks >= MAX_MEM_BLOCKS)
 132                 sound_nblocks = MAX_MEM_BLOCKS - 1;
 133
 134         if (op == NULL) {
 135                 printk(KERN_ERR "Sound: Can't allocate mixer driver for (%s)\n", name);
 136                 return -ENOMEM;
 137         }
 138         memset((char *) op, 0, sizeof(struct mixer_operations));
 139         memcpy((char *) op, (char *) driver, driver_size);
 140
 141         strlcpy(op->name, name, sizeof(op->name));
 142         op->devc = devc;
 143
 144         mixer_devs[n] = op;
 145         return n;
 146 }
 147 EXPORT_SYMBOL(sound_install_mixer);
 148
 149 void sound_unload_audiodev(int dev)
 150 {
 151         if (dev != -1) {
 152                 DMAbuf_deinit(dev);
 153                 audio_devs[dev] = NULL;
 154                 unregister_sound_dsp((dev<<4)+3);
 155         }
 156 }
 157 EXPORT_SYMBOL(sound_unload_audiodev);
 158
 159 static int sound_alloc_audiodev(void)
 160 {
 161         int i = register_sound_dsp(&oss_sound_fops, -1);
 162         if(i==-1)
 163                 return i;
 164         i>>=4;
 165         if(i>=num_audiodevs)
 166                 num_audiodevs = i + 1;
 167         return i;
 168 }
 169
 170 int sound_alloc_mididev(void)
 171 {
 172         int i = register_sound_midi(&oss_sound_fops, -1);
 173         if(i==-1)
 174                 return i;
 175         i>>=4;
 176         if(i>=num_midis)
 177                 num_midis = i + 1;
 178         return i;
 179 }
 180 EXPORT_SYMBOL(sound_alloc_mididev);
 181
 182 int sound_alloc_synthdev(void)
 183 {
 184         int i;
 185
 186         for (i = 0; i < MAX_SYNTH_DEV; i++) {
 187                 if (synth_devs[i] == NULL) {
 188                         if (i >= num_synths)
 189                                 num_synths++;
 190                         return i;
 191                 }
 192         }
 193         return -1;
 194 }
 195 EXPORT_SYMBOL(sound_alloc_synthdev);
 196
 197 int sound_alloc_mixerdev(void)
 198 {
 199         int i = register_sound_mixer(&oss_sound_fops, -1);
 200         if(i==-1)
 201                 return -1;
 202         i>>=4;
 203         if(i>=num_mixers)
 204                 num_mixers = i + 1;
 205         return i;
 206 }
 207 EXPORT_SYMBOL(sound_alloc_mixerdev);
 208
 209 int sound_alloc_timerdev(void)
 210 {
 211         int i;
 212
 213         for (i = 0; i < MAX_TIMER_DEV; i++) {
 214                 if (sound_timer_devs[i] == NULL) {
 215                         if (i >= num_sound_timers)
 216                                 num_sound_timers++;
 217                         return i;
 218                 }
 219         }
 220         return -1;
 221 }
 222 EXPORT_SYMBOL(sound_alloc_timerdev);
 223
 224 void sound_unload_mixerdev(int dev)
 225 {
 226         if (dev != -1) {
 227                 mixer_devs[dev] = NULL;
 228                 unregister_sound_mixer(dev<<4);
 229                 num_mixers--;
 230         }
 231 }
 232 EXPORT_SYMBOL(sound_unload_mixerdev);
 233
 234 void sound_unload_mididev(int dev)
 235 {
 236         if (dev != -1) {
 237                 midi_devs[dev] = NULL;
 238                 unregister_sound_midi((dev<<4)+2);
 239         }
 240 }
 241 EXPORT_SYMBOL(sound_unload_mididev);
 242
 243 void sound_unload_synthdev(int dev)
 244 {
 245         if (dev != -1)
 246                 synth_devs[dev] = NULL;
 247 }
 248 EXPORT_SYMBOL(sound_unload_synthdev);
 249
 250 void sound_unload_timerdev(int dev)
 251 {
 252         if (dev != -1)
 253                 sound_timer_devs[dev] = NULL;
 254 }
 255 EXPORT_SYMBOL(sound_unload_timerdev);