sound/oss/dev_table.c

   1 /*
   2  * sound/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 #define _DEV_TABLE_C_
  17 #include "sound_config.h"
  18
  19 static int sound_alloc_audiodev(void);
  20
  21 int sound_install_audiodrv(int vers, char *name, struct audio_driver *driver,
  22                         int driver_size, int flags, unsigned int format_mask,
  23                         void *devc, int dma1, int dma2)
  24 {
  25         struct audio_driver *d;
  26         struct audio_operations *op;
  27         int num;
  28
  29         if (vers != AUDIO_DRIVER_VERSION || driver_size > sizeof(struct audio_driver)) {
  30                 printk(KERN_ERR "Sound: Incompatible audio driver for %s\n", name);
  31                 return -(EINVAL);
  32         }
  33         num = sound_alloc_audiodev();
  34
  35         if (num == -1) {
  36                 printk(KERN_ERR "sound: Too many audio drivers\n");
  37                 return -(EBUSY);
  38         }
  39         d = (struct audio_driver *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_driver)));
  40
  41         if (sound_nblocks < 1024)
  42                 sound_nblocks++;
  43
  44         op = (struct audio_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_operations)));
  45
  46         if (sound_nblocks < 1024)
  47                 sound_nblocks++;
  48         if (d == NULL || op == NULL) {
  49                 printk(KERN_ERR "Sound: Can't allocate driver for (%s)\n", name);
  50                 sound_unload_audiodev(num);
  51                 return -(ENOMEM);
  52         }
  53         memset((char *) op, 0, sizeof(struct audio_operations));
  54         init_waitqueue_head(&op->in_sleeper);
  55         init_waitqueue_head(&op->out_sleeper);
  56         init_waitqueue_head(&op->poll_sleeper);
  57         if (driver_size < sizeof(struct audio_driver))
  58                 memset((char *) d, 0, sizeof(struct audio_driver));
  59
  60         memcpy((char *) d, (char *) driver, driver_size);
  61
  62         op->d = d;
  63         strlcpy(op->name, name, sizeof(op->name));
  64         op->flags = flags;
  65         op->format_mask = format_mask;
  66         op->devc = devc;
  67
  68         /*
  69          *    Hardcoded defaults
  70          */
  71         audio_devs[num] = op;
  72
  73         DMAbuf_init(num, dma1, dma2);
  74
  75         audio_init_devices();
  76         return num;
  77 }
  78
  79 int sound_install_mixer(int vers, char *name, struct mixer_operations *driver,
  80         int driver_size, void *devc)
  81 {
  82         struct mixer_operations *op;
  83
  84         int n = sound_alloc_mixerdev();
  85
  86         if (n == -1) {
  87                 printk(KERN_ERR "Sound: Too many mixer drivers\n");
  88                 return -EBUSY;
  89         }
  90         if (vers != MIXER_DRIVER_VERSION ||
  91                 driver_size > sizeof(struct mixer_operations)) {
  92                 printk(KERN_ERR "Sound: Incompatible mixer driver for %s\n", name);
  93                 return -EINVAL;
  94         }
  95
  96         /* FIXME: This leaks a mixer_operations struct every time its called
  97            until you unload sound! */
  98
  99         op = (struct mixer_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct mixer_operations)));
 100
 101         if (sound_nblocks < 1024)
 102                 sound_nblocks++;
 103         if (op == NULL) {
 104                 printk(KERN_ERR "Sound: Can't allocate mixer driver for (%s)\n", name);
 105                 return -ENOMEM;
 106         }
 107         memset((char *) op, 0, sizeof(struct mixer_operations));
 108         memcpy((char *) op, (char *) driver, driver_size);
 109
 110         strlcpy(op->name, name, sizeof(op->name));
 111         op->devc = devc;
 112
 113         mixer_devs[n] = op;
 114         return n;
 115 }
 116
 117 void sound_unload_audiodev(int dev)
 118 {
 119         if (dev != -1) {
 120                 DMAbuf_deinit(dev);
 121                 audio_devs[dev] = NULL;
 122                 unregister_sound_dsp((dev<<4)+3);
 123         }
 124 }
 125
 126 static int sound_alloc_audiodev(void)
 127 {
 128         int i = register_sound_dsp(&oss_sound_fops, -1);
 129         if(i==-1)
 130                 return i;
 131         i>>=4;
 132         if(i>=num_audiodevs)
 133                 num_audiodevs = i + 1;
 134         return i;
 135 }
 136
 137 int sound_alloc_mididev(void)
 138 {
 139         int i = register_sound_midi(&oss_sound_fops, -1);
 140         if(i==-1)
 141                 return i;
 142         i>>=4;
 143         if(i>=num_midis)
 144                 num_midis = i + 1;
 145         return i;
 146 }
 147
 148 int sound_alloc_synthdev(void)
 149 {
 150         int i;
 151
 152         for (i = 0; i < MAX_SYNTH_DEV; i++) {
 153                 if (synth_devs[i] == NULL) {
 154                         if (i >= num_synths)
 155                                 num_synths++;
 156                         return i;
 157                 }
 158         }
 159         return -1;
 160 }
 161
 162 int sound_alloc_mixerdev(void)
 163 {
 164         int i = register_sound_mixer(&oss_sound_fops, -1);
 165         if(i==-1)
 166                 return -1;
 167         i>>=4;
 168         if(i>=num_mixers)
 169                 num_mixers = i + 1;
 170         return i;
 171 }
 172
 173 int sound_alloc_timerdev(void)
 174 {
 175         int i;
 176
 177         for (i = 0; i < MAX_TIMER_DEV; i++) {
 178                 if (sound_timer_devs[i] == NULL) {
 179                         if (i >= num_sound_timers)
 180                                 num_sound_timers++;
 181                         return i;
 182                 }
 183         }
 184         return -1;
 185 }
 186
 187 void sound_unload_mixerdev(int dev)
 188 {
 189         if (dev != -1) {
 190                 mixer_devs[dev] = NULL;
 191                 unregister_sound_mixer(dev<<4);
 192                 num_mixers--;
 193         }
 194 }
 195
 196 void sound_unload_mididev(int dev)
 197 {
 198         if (dev != -1) {
 199                 midi_devs[dev] = NULL;
 200                 unregister_sound_midi((dev<<4)+2);
 201         }
 202 }
 203
 204 void sound_unload_synthdev(int dev)
 205 {
 206         if (dev != -1)
 207                 synth_devs[dev] = NULL;
 208 }
 209
 210 void sound_unload_timerdev(int dev)
 211 {
 212         if (dev != -1)
 213                 sound_timer_devs[dev] = NULL;
 214 }