Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Advanced Linux Sound Architecture |
Jaroslav Kysela | c1017a4 | 2007-10-15 09:50:19 +0200 | [diff] [blame] | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/init.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/time.h> |
Takashi Iwai | 9a1a2a1 | 2005-11-22 15:46:41 +0100 | [diff] [blame] | 25 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/moduleparam.h> |
| 27 | #include <sound/core.h> |
| 28 | #include <sound/minors.h> |
| 29 | #include <sound/info.h> |
| 30 | #include <sound/version.h> |
| 31 | #include <sound/control.h> |
| 32 | #include <sound/initval.h> |
| 33 | #include <linux/kmod.h> |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 34 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | static int major = CONFIG_SND_MAJOR; |
| 37 | int snd_major; |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 38 | EXPORT_SYMBOL(snd_major); |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | static int cards_limit = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Jaroslav Kysela | c1017a4 | 2007-10-15 09:50:19 +0200 | [diff] [blame] | 42 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards."); |
| 44 | MODULE_LICENSE("GPL"); |
| 45 | module_param(major, int, 0444); |
| 46 | MODULE_PARM_DESC(major, "Major # for sound driver."); |
| 47 | module_param(cards_limit, int, 0444); |
| 48 | MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR); |
| 50 | |
| 51 | /* this one holds the actual max. card number currently available. |
| 52 | * as default, it's identical with cards_limit option. when more |
| 53 | * modules are loaded manually, this limit number increases, too. |
| 54 | */ |
| 55 | int snd_ecards_limit; |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 56 | EXPORT_SYMBOL(snd_ecards_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 58 | static struct snd_minor *snd_minors[SNDRV_OS_MINORS]; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 59 | static DEFINE_MUTEX(sound_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Johannes Berg | ee2da99 | 2008-07-09 10:28:41 +0200 | [diff] [blame] | 61 | #ifdef CONFIG_MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | /** |
| 64 | * snd_request_card - try to load the card module |
| 65 | * @card: the card number |
| 66 | * |
| 67 | * Tries to load the module "snd-card-X" for the given card number |
Johannes Berg | ee2da99 | 2008-07-09 10:28:41 +0200 | [diff] [blame] | 68 | * via request_module. Returns immediately if already loaded. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | */ |
| 70 | void snd_request_card(int card) |
| 71 | { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 72 | if (snd_card_locked(card)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | return; |
| 74 | if (card < 0 || card >= cards_limit) |
| 75 | return; |
| 76 | request_module("snd-card-%i", card); |
| 77 | } |
| 78 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 79 | EXPORT_SYMBOL(snd_request_card); |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static void snd_request_other(int minor) |
| 82 | { |
| 83 | char *str; |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | switch (minor) { |
| 86 | case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break; |
| 87 | case SNDRV_MINOR_TIMER: str = "snd-timer"; break; |
| 88 | default: return; |
| 89 | } |
| 90 | request_module(str); |
| 91 | } |
| 92 | |
Johannes Berg | ee2da99 | 2008-07-09 10:28:41 +0200 | [diff] [blame] | 93 | #endif /* modular kernel */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Clemens Ladisch | f87135f | 2005-11-20 14:06:59 +0100 | [diff] [blame] | 95 | /** |
| 96 | * snd_lookup_minor_data - get user data of a registered device |
| 97 | * @minor: the minor number |
| 98 | * @type: device type (SNDRV_DEVICE_TYPE_XXX) |
| 99 | * |
| 100 | * Checks that a minor device with the specified type is registered, and returns |
| 101 | * its user data pointer. |
| 102 | */ |
| 103 | void *snd_lookup_minor_data(unsigned int minor, int type) |
| 104 | { |
| 105 | struct snd_minor *mreg; |
| 106 | void *private_data; |
| 107 | |
Adrian Bunk | 3a63e444 | 2006-03-13 14:14:10 +0100 | [diff] [blame] | 108 | if (minor >= ARRAY_SIZE(snd_minors)) |
Clemens Ladisch | f87135f | 2005-11-20 14:06:59 +0100 | [diff] [blame] | 109 | return NULL; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 110 | mutex_lock(&sound_mutex); |
Clemens Ladisch | f87135f | 2005-11-20 14:06:59 +0100 | [diff] [blame] | 111 | mreg = snd_minors[minor]; |
| 112 | if (mreg && mreg->type == type) |
| 113 | private_data = mreg->private_data; |
| 114 | else |
| 115 | private_data = NULL; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 116 | mutex_unlock(&sound_mutex); |
Clemens Ladisch | f87135f | 2005-11-20 14:06:59 +0100 | [diff] [blame] | 117 | return private_data; |
| 118 | } |
| 119 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 120 | EXPORT_SYMBOL(snd_lookup_minor_data); |
| 121 | |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 122 | #ifdef CONFIG_MODULES |
| 123 | static struct snd_minor *autoload_device(unsigned int minor) |
| 124 | { |
| 125 | int dev; |
| 126 | mutex_unlock(&sound_mutex); /* release lock temporarily */ |
| 127 | dev = SNDRV_MINOR_DEVICE(minor); |
| 128 | if (dev == SNDRV_MINOR_CONTROL) { |
| 129 | /* /dev/aloadC? */ |
| 130 | int card = SNDRV_MINOR_CARD(minor); |
| 131 | if (snd_cards[card] == NULL) |
| 132 | snd_request_card(card); |
| 133 | } else if (dev == SNDRV_MINOR_GLOBAL) { |
| 134 | /* /dev/aloadSEQ */ |
| 135 | snd_request_other(minor); |
| 136 | } |
| 137 | mutex_lock(&sound_mutex); /* reacuire lock */ |
| 138 | return snd_minors[minor]; |
| 139 | } |
| 140 | #else /* !CONFIG_MODULES */ |
| 141 | #define autoload_device(minor) NULL |
| 142 | #endif /* CONFIG_MODULES */ |
| 143 | |
| 144 | static int snd_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 146 | unsigned int minor = iminor(inode); |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 147 | struct snd_minor *mptr = NULL; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 148 | const struct file_operations *old_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | int err = 0; |
| 150 | |
Adrian Bunk | 3a63e444 | 2006-03-13 14:14:10 +0100 | [diff] [blame] | 151 | if (minor >= ARRAY_SIZE(snd_minors)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | return -ENODEV; |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 153 | mutex_lock(&sound_mutex); |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 154 | mptr = snd_minors[minor]; |
| 155 | if (mptr == NULL) { |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 156 | mptr = autoload_device(minor); |
| 157 | if (!mptr) { |
| 158 | mutex_unlock(&sound_mutex); |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 159 | return -ENODEV; |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 160 | } |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 161 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | old_fops = file->f_op; |
| 163 | file->f_op = fops_get(mptr->f_ops); |
Laurent Pinchart | f41ced8 | 2009-01-06 14:40:40 -0800 | [diff] [blame] | 164 | if (file->f_op == NULL) { |
| 165 | file->f_op = old_fops; |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 166 | err = -ENODEV; |
Laurent Pinchart | f41ced8 | 2009-01-06 14:40:40 -0800 | [diff] [blame] | 167 | } |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 168 | mutex_unlock(&sound_mutex); |
| 169 | if (err < 0) |
| 170 | return err; |
| 171 | |
| 172 | if (file->f_op->open) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | err = file->f_op->open(inode, file); |
Takashi Iwai | 4cf19b8 | 2010-04-07 18:52:08 +0200 | [diff] [blame] | 174 | if (err) { |
| 175 | fops_put(file->f_op); |
| 176 | file->f_op = fops_get(old_fops); |
| 177 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | fops_put(old_fops); |
| 180 | return err; |
| 181 | } |
| 182 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 183 | static const struct file_operations snd_fops = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
| 185 | .owner = THIS_MODULE, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 186 | .open = snd_open, |
| 187 | .llseek = noop_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | }; |
| 189 | |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 190 | #ifdef CONFIG_SND_DYNAMIC_MINORS |
| 191 | static int snd_find_free_minor(void) |
| 192 | { |
| 193 | int minor; |
| 194 | |
| 195 | for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) { |
| 196 | /* skip minors still used statically for autoloading devices */ |
| 197 | if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL || |
| 198 | minor == SNDRV_MINOR_SEQUENCER) |
| 199 | continue; |
| 200 | if (!snd_minors[minor]) |
| 201 | return minor; |
| 202 | } |
| 203 | return -EBUSY; |
| 204 | } |
| 205 | #else |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 206 | static int snd_kernel_minor(int type, struct snd_card *card, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
| 208 | int minor; |
| 209 | |
| 210 | switch (type) { |
| 211 | case SNDRV_DEVICE_TYPE_SEQUENCER: |
| 212 | case SNDRV_DEVICE_TYPE_TIMER: |
| 213 | minor = type; |
| 214 | break; |
| 215 | case SNDRV_DEVICE_TYPE_CONTROL: |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 216 | if (snd_BUG_ON(!card)) |
| 217 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | minor = SNDRV_MINOR(card->number, type); |
| 219 | break; |
| 220 | case SNDRV_DEVICE_TYPE_HWDEP: |
| 221 | case SNDRV_DEVICE_TYPE_RAWMIDI: |
| 222 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: |
| 223 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 224 | if (snd_BUG_ON(!card)) |
| 225 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | minor = SNDRV_MINOR(card->number, type + dev); |
| 227 | break; |
| 228 | default: |
| 229 | return -EINVAL; |
| 230 | } |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 231 | if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS)) |
| 232 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | return minor; |
| 234 | } |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 235 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
| 237 | /** |
Johannes Berg | 12b131c | 2006-10-05 15:05:34 +0200 | [diff] [blame] | 238 | * snd_register_device_for_dev - Register the ALSA device file for the card |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX |
| 240 | * @card: the card instance |
| 241 | * @dev: the device index |
Clemens Ladisch | 2af677f | 2005-11-20 14:03:48 +0100 | [diff] [blame] | 242 | * @f_ops: the file operations |
Clemens Ladisch | f87135f | 2005-11-20 14:06:59 +0100 | [diff] [blame] | 243 | * @private_data: user pointer for f_ops->open() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | * @name: the device file name |
Johannes Berg | 12b131c | 2006-10-05 15:05:34 +0200 | [diff] [blame] | 245 | * @device: the &struct device to link this new device to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | * |
| 247 | * Registers an ALSA device file for the given card. |
| 248 | * The operators have to be set in reg parameter. |
| 249 | * |
Johannes Berg | 12b131c | 2006-10-05 15:05:34 +0200 | [diff] [blame] | 250 | * Returns zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | */ |
Johannes Berg | 12b131c | 2006-10-05 15:05:34 +0200 | [diff] [blame] | 252 | int snd_register_device_for_dev(int type, struct snd_card *card, int dev, |
| 253 | const struct file_operations *f_ops, |
| 254 | void *private_data, |
| 255 | const char *name, struct device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 257 | int minor; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 258 | struct snd_minor *preg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 260 | if (snd_BUG_ON(!name)) |
| 261 | return -EINVAL; |
Clemens Ladisch | 562b590 | 2006-07-05 11:24:22 +0200 | [diff] [blame] | 262 | preg = kmalloc(sizeof *preg, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | if (preg == NULL) |
| 264 | return -ENOMEM; |
Clemens Ladisch | 2af677f | 2005-11-20 14:03:48 +0100 | [diff] [blame] | 265 | preg->type = type; |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 266 | preg->card = card ? card->number : -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | preg->device = dev; |
Clemens Ladisch | 2af677f | 2005-11-20 14:03:48 +0100 | [diff] [blame] | 268 | preg->f_ops = f_ops; |
Clemens Ladisch | f87135f | 2005-11-20 14:06:59 +0100 | [diff] [blame] | 269 | preg->private_data = private_data; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 270 | mutex_lock(&sound_mutex); |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 271 | #ifdef CONFIG_SND_DYNAMIC_MINORS |
| 272 | minor = snd_find_free_minor(); |
| 273 | #else |
| 274 | minor = snd_kernel_minor(type, card, dev); |
| 275 | if (minor >= 0 && snd_minors[minor]) |
| 276 | minor = -EBUSY; |
| 277 | #endif |
| 278 | if (minor < 0) { |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 279 | mutex_unlock(&sound_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | kfree(preg); |
Clemens Ladisch | 332682b | 2005-11-20 14:07:47 +0100 | [diff] [blame] | 281 | return minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 283 | snd_minors[minor] = preg; |
Greg Kroah-Hartman | abe9ab8 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 284 | preg->dev = device_create(sound_class, device, MKDEV(major, minor), |
| 285 | private_data, "%s", name); |
Mariusz Kozlowski | 2469049 | 2007-10-09 10:34:06 +0200 | [diff] [blame] | 286 | if (IS_ERR(preg->dev)) { |
| 287 | snd_minors[minor] = NULL; |
| 288 | mutex_unlock(&sound_mutex); |
| 289 | minor = PTR_ERR(preg->dev); |
| 290 | kfree(preg); |
| 291 | return minor; |
| 292 | } |
| 293 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 294 | mutex_unlock(&sound_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | return 0; |
| 296 | } |
| 297 | |
Johannes Berg | 12b131c | 2006-10-05 15:05:34 +0200 | [diff] [blame] | 298 | EXPORT_SYMBOL(snd_register_device_for_dev); |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 299 | |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 300 | /* find the matching minor record |
| 301 | * return the index of snd_minor, or -1 if not found |
| 302 | */ |
| 303 | static int find_snd_minor(int type, struct snd_card *card, int dev) |
| 304 | { |
| 305 | int cardnum, minor; |
| 306 | struct snd_minor *mptr; |
| 307 | |
| 308 | cardnum = card ? card->number : -1; |
| 309 | for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) |
| 310 | if ((mptr = snd_minors[minor]) != NULL && |
| 311 | mptr->type == type && |
| 312 | mptr->card == cardnum && |
| 313 | mptr->device == dev) |
| 314 | return minor; |
| 315 | return -1; |
| 316 | } |
| 317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | /** |
| 319 | * snd_unregister_device - unregister the device on the given card |
| 320 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX |
| 321 | * @card: the card instance |
| 322 | * @dev: the device index |
| 323 | * |
| 324 | * Unregisters the device file already registered via |
| 325 | * snd_register_device(). |
| 326 | * |
| 327 | * Returns zero if sucecessful, or a negative error code on failure |
| 328 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 329 | int snd_unregister_device(int type, struct snd_card *card, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | { |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 331 | int minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 333 | mutex_lock(&sound_mutex); |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 334 | minor = find_snd_minor(type, card, dev); |
| 335 | if (minor < 0) { |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 336 | mutex_unlock(&sound_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | return -EINVAL; |
| 338 | } |
| 339 | |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 340 | device_destroy(sound_class, MKDEV(major, minor)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 342 | kfree(snd_minors[minor]); |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 343 | snd_minors[minor] = NULL; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 344 | mutex_unlock(&sound_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | return 0; |
| 346 | } |
| 347 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 348 | EXPORT_SYMBOL(snd_unregister_device); |
| 349 | |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 350 | int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev, |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 351 | struct device_attribute *attr) |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 352 | { |
| 353 | int minor, ret = -EINVAL; |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 354 | struct device *d; |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 355 | |
| 356 | mutex_lock(&sound_mutex); |
| 357 | minor = find_snd_minor(type, card, dev); |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 358 | if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL) |
| 359 | ret = device_create_file(d, attr); |
Takashi Iwai | 9d19f48 | 2006-09-06 14:27:46 +0200 | [diff] [blame] | 360 | mutex_unlock(&sound_mutex); |
| 361 | return ret; |
| 362 | |
| 363 | } |
| 364 | |
| 365 | EXPORT_SYMBOL(snd_add_device_sysfs_file); |
| 366 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 367 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /* |
| 369 | * INFO PART |
| 370 | */ |
| 371 | |
Takashi Iwai | 6581f4e | 2006-05-17 17:14:51 +0200 | [diff] [blame] | 372 | static struct snd_info_entry *snd_minor_info_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Clemens Ladisch | 2af677f | 2005-11-20 14:03:48 +0100 | [diff] [blame] | 374 | static const char *snd_device_type_name(int type) |
| 375 | { |
| 376 | switch (type) { |
| 377 | case SNDRV_DEVICE_TYPE_CONTROL: |
| 378 | return "control"; |
| 379 | case SNDRV_DEVICE_TYPE_HWDEP: |
| 380 | return "hardware dependent"; |
| 381 | case SNDRV_DEVICE_TYPE_RAWMIDI: |
| 382 | return "raw midi"; |
| 383 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: |
| 384 | return "digital audio playback"; |
| 385 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: |
| 386 | return "digital audio capture"; |
| 387 | case SNDRV_DEVICE_TYPE_SEQUENCER: |
| 388 | return "sequencer"; |
| 389 | case SNDRV_DEVICE_TYPE_TIMER: |
| 390 | return "timer"; |
| 391 | default: |
| 392 | return "?"; |
| 393 | } |
| 394 | } |
| 395 | |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 396 | static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 398 | int minor; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 399 | struct snd_minor *mptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 401 | mutex_lock(&sound_mutex); |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 402 | for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) { |
| 403 | if (!(mptr = snd_minors[minor])) |
| 404 | continue; |
| 405 | if (mptr->card >= 0) { |
| 406 | if (mptr->device >= 0) |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 407 | snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n", |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 408 | minor, mptr->card, mptr->device, |
| 409 | snd_device_type_name(mptr->type)); |
| 410 | else |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 411 | snd_iprintf(buffer, "%3i: [%2i] : %s\n", |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 412 | minor, mptr->card, |
| 413 | snd_device_type_name(mptr->type)); |
| 414 | } else |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 415 | snd_iprintf(buffer, "%3i: : %s\n", minor, |
Clemens Ladisch | 6983b72 | 2005-11-20 14:05:49 +0100 | [diff] [blame] | 416 | snd_device_type_name(mptr->type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 418 | mutex_unlock(&sound_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | int __init snd_minor_info_init(void) |
| 422 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 423 | struct snd_info_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL); |
| 426 | if (entry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | entry->c.text.read = snd_minor_info_read; |
| 428 | if (snd_info_register(entry) < 0) { |
| 429 | snd_info_free_entry(entry); |
| 430 | entry = NULL; |
| 431 | } |
| 432 | } |
| 433 | snd_minor_info_entry = entry; |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | int __exit snd_minor_info_done(void) |
| 438 | { |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 439 | snd_info_free_entry(snd_minor_info_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | return 0; |
| 441 | } |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 442 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
| 444 | /* |
| 445 | * INIT PART |
| 446 | */ |
| 447 | |
| 448 | static int __init alsa_sound_init(void) |
| 449 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | snd_major = major; |
| 451 | snd_ecards_limit = cards_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | if (register_chrdev(major, "alsa", &snd_fops)) { |
| 453 | snd_printk(KERN_ERR "unable to register native major device number %d\n", major); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | return -EIO; |
| 455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (snd_info_init() < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | unregister_chrdev(major, "alsa"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | return -ENOMEM; |
| 459 | } |
| 460 | snd_info_minor_register(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | #ifndef MODULE |
| 462 | printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"); |
| 463 | #endif |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | static void __exit alsa_sound_exit(void) |
| 468 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | snd_info_minor_unregister(); |
| 470 | snd_info_done(); |
Akinobu Mita | 68fc4fa | 2007-07-19 01:47:50 -0700 | [diff] [blame] | 471 | unregister_chrdev(major, "alsa"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | |
Thadeu Lima de Souza Cascardo | c181a13 | 2010-01-12 20:20:39 -0200 | [diff] [blame] | 474 | subsys_initcall(alsa_sound_init); |
| 475 | module_exit(alsa_sound_exit); |