LXR linux/sound/core/sound

   1/*
   2 *  Advanced Linux Sound Architecture
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 *
  20 */
  21
  22#include <linux/init.h>
  23#include <linux/export.h>
  24#include <linux/slab.h>
  25#include <linux/time.h>
  26#include <sound/core.h>
  27#include <sound/minors.h>
  28#include <sound/info.h>
  29#include <linux/sound.h>
  30#include <linux/mutex.h>
  31
  32#define SNDRV_OSS_MINORS 256
  33
  34static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
  35static DEFINE_MUTEX(sound_oss_mutex);
  36
  37/* NOTE: This function increments the refcount of the associated card like
  38 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
  39 */
  40void *snd_lookup_oss_minor_data(unsigned int minor, int type)
  41{
  42        struct snd_minor *mreg;
  43        void *private_data;
  44
  45        if (minor >= ARRAY_SIZE(snd_oss_minors))
  46                return NULL;
  47        mutex_lock(&sound_oss_mutex);
  48        mreg = snd_oss_minors[minor];
  49        if (mreg && mreg->type == type) {
  50                private_data = mreg->private_data;
  51                if (private_data && mreg->card_ptr)
  52                        get_device(&mreg->card_ptr->card_dev);
  53        } else
  54                private_data = NULL;
  55        mutex_unlock(&sound_oss_mutex);
  56        return private_data;
  57}
  58
  59EXPORT_SYMBOL(snd_lookup_oss_minor_data);
  60
  61static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
  62{
  63        int minor;
  64
  65        switch (type) {
  66        case SNDRV_OSS_DEVICE_TYPE_MIXER:
  67                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  68                        return -EINVAL;
  69                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
  70                break;
  71        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
  72                minor = SNDRV_MINOR_OSS_SEQUENCER;
  73                break;
  74        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
  75                minor = SNDRV_MINOR_OSS_MUSIC;
  76                break;
  77        case SNDRV_OSS_DEVICE_TYPE_PCM:
  78                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  79                        return -EINVAL;
  80                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
  81                break;
  82        case SNDRV_OSS_DEVICE_TYPE_MIDI:
  83                if (snd_BUG_ON(!card || dev < 0 || dev > 1))
  84                        return -EINVAL;
  85                minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
  86                break;
  87        case SNDRV_OSS_DEVICE_TYPE_DMFM:
  88                minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
  89                break;
  90        case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
  91                minor = SNDRV_MINOR_OSS_SNDSTAT;
  92                break;
  93        default:
  94                return -EINVAL;
  95        }
  96        if (minor < 0 || minor >= SNDRV_OSS_MINORS)
  97                return -EINVAL;
  98        return minor;
  99}
 100
 101int snd_register_oss_device(int type, struct snd_card *card, int dev,
 102                            const struct file_operations *f_ops, void *private_data)
 103{
 104        int minor = snd_oss_kernel_minor(type, card, dev);
 105        int minor_unit;
 106        struct snd_minor *preg;
 107        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 108        int track2 = -1;
 109        int register1 = -1, register2 = -1;
 110        struct device *carddev = snd_card_get_device_link(card);
 111
 112        if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 113                return 0; /* ignore silently */
 114        if (minor < 0)
 115                return minor;
 116        preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 117        if (preg == NULL)
 118                return -ENOMEM;
 119        preg->type = type;
 120        preg->card = card ? card->number : -1;
 121        preg->device = dev;
 122        preg->f_ops = f_ops;
 123        preg->private_data = private_data;
 124        preg->card_ptr = card;
 125        mutex_lock(&sound_oss_mutex);
 126        snd_oss_minors[minor] = preg;
 127        minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 128        switch (minor_unit) {
 129        case SNDRV_MINOR_OSS_PCM:
 130                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 131                break;
 132        case SNDRV_MINOR_OSS_MIDI:
 133                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 134                break;
 135        case SNDRV_MINOR_OSS_MIDI1:
 136                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 137                break;
 138        }
 139        register1 = register_sound_special_device(f_ops, minor, carddev);
 140        if (register1 != minor)
 141                goto __end;
 142        if (track2 >= 0) {
 143                register2 = register_sound_special_device(f_ops, track2,
 144                                                          carddev);
 145                if (register2 != track2)
 146                        goto __end;
 147                snd_oss_minors[track2] = preg;
 148        }
 149        mutex_unlock(&sound_oss_mutex);
 150        return 0;
 151
 152      __end:
 153        if (register2 >= 0)
 154                unregister_sound_special(register2);
 155        if (register1 >= 0)
 156                unregister_sound_special(register1);
 157        snd_oss_minors[minor] = NULL;
 158        mutex_unlock(&sound_oss_mutex);
 159        kfree(preg);
 160        return -EBUSY;
 161}
 162
 163EXPORT_SYMBOL(snd_register_oss_device);
 164
 165int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 166{
 167        int minor = snd_oss_kernel_minor(type, card, dev);
 168        int cidx = SNDRV_MINOR_OSS_CARD(minor);
 169        int track2 = -1;
 170        struct snd_minor *mptr;
 171
 172        if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 173                return 0;
 174        if (minor < 0)
 175                return minor;
 176        mutex_lock(&sound_oss_mutex);
 177        mptr = snd_oss_minors[minor];
 178        if (mptr == NULL) {
 179                mutex_unlock(&sound_oss_mutex);
 180                return -ENOENT;
 181        }
 182        unregister_sound_special(minor);
 183        switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 184        case SNDRV_MINOR_OSS_PCM:
 185                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 186                break;
 187        case SNDRV_MINOR_OSS_MIDI:
 188                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 189                break;
 190        case SNDRV_MINOR_OSS_MIDI1:
 191                track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 192                break;
 193        }
 194        if (track2 >= 0) {
 195                unregister_sound_special(track2);
 196                snd_oss_minors[track2] = NULL;
 197        }
 198        snd_oss_minors[minor] = NULL;
 199        mutex_unlock(&sound_oss_mutex);
 200        kfree(mptr);
 201        return 0;
 202}
 203
 204EXPORT_SYMBOL(snd_unregister_oss_device);
 205
 206/*
 207 *  INFO PART
 208 */
 209
 210#ifdef CONFIG_SND_PROC_FS
 211static const char *snd_oss_device_type_name(int type)
 212{
 213        switch (type) {
 214        case SNDRV_OSS_DEVICE_TYPE_MIXER:
 215                return "mixer";
 216        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 217        case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 218                return "sequencer";
 219        case SNDRV_OSS_DEVICE_TYPE_PCM:
 220                return "digital audio";
 221        case SNDRV_OSS_DEVICE_TYPE_MIDI:
 222                return "raw midi";
 223        case SNDRV_OSS_DEVICE_TYPE_DMFM:
 224                return "hardware dependent";
 225        default:
 226                return "?";
 227        }
 228}
 229
 230static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 231                                    struct snd_info_buffer *buffer)
 232{
 233        int minor;
 234        struct snd_minor *mptr;
 235
 236        mutex_lock(&sound_oss_mutex);
 237        for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
 238                if (!(mptr = snd_oss_minors[minor]))
 239                        continue;
 240                if (mptr->card >= 0)
 241                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
 242                                    mptr->card, mptr->device,
 243                                    snd_oss_device_type_name(mptr->type));
 244                else
 245                        snd_iprintf(buffer, "%3i:       : %s\n", minor,
 246                                    snd_oss_device_type_name(mptr->type));
 247        }
 248        mutex_unlock(&sound_oss_mutex);
 249}
 250
 251
 252int __init snd_minor_info_oss_init(void)
 253{
 254        struct snd_info_entry *entry;
 255
 256        entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 257        if (!entry)
 258                return -ENOMEM;
 259        entry->c.text.read = snd_minor_info_oss_read;
 260        return snd_info_register(entry); /* freed in error path */
 261}
 262#endif /* CONFIG_SND_PROC_FS */
 263