Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Initialization routines |
| 3 | * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/file.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/ctype.h> |
| 29 | #include <linux/pci.h> |
| 30 | #include <linux/pm.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 31 | #include <linux/platform_device.h> |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <sound/core.h> |
| 34 | #include <sound/control.h> |
| 35 | #include <sound/info.h> |
| 36 | |
| 37 | struct snd_shutdown_f_ops { |
| 38 | struct file_operations f_ops; |
| 39 | struct snd_shutdown_f_ops *next; |
| 40 | }; |
| 41 | |
| 42 | unsigned int snd_cards_lock = 0; /* locked for registering/using */ |
| 43 | snd_card_t *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL}; |
| 44 | DEFINE_RWLOCK(snd_card_rwlock); |
| 45 | |
| 46 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 47 | int (*snd_mixer_oss_notify_callback)(snd_card_t *card, int free_flag); |
| 48 | #endif |
| 49 | |
| 50 | static void snd_card_id_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) |
| 51 | { |
| 52 | snd_iprintf(buffer, "%s\n", entry->card->id); |
| 53 | } |
| 54 | |
| 55 | static void snd_card_free_thread(void * __card); |
| 56 | |
| 57 | /** |
| 58 | * snd_card_new - create and initialize a soundcard structure |
| 59 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
| 60 | * @xid: card identification (ASCII string) |
| 61 | * @module: top level module for locking |
| 62 | * @extra_size: allocate this extra size after the main soundcard structure |
| 63 | * |
| 64 | * Creates and initializes a soundcard structure. |
| 65 | * |
| 66 | * Returns kmallocated snd_card_t structure. Creates the ALSA control interface |
| 67 | * (which is blocked until snd_card_register function is called). |
| 68 | */ |
| 69 | snd_card_t *snd_card_new(int idx, const char *xid, |
| 70 | struct module *module, int extra_size) |
| 71 | { |
| 72 | snd_card_t *card; |
| 73 | int err; |
| 74 | |
| 75 | if (extra_size < 0) |
| 76 | extra_size = 0; |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 77 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | if (card == NULL) |
| 79 | return NULL; |
| 80 | if (xid) { |
| 81 | if (!snd_info_check_reserved_words(xid)) |
| 82 | goto __error; |
| 83 | strlcpy(card->id, xid, sizeof(card->id)); |
| 84 | } |
| 85 | err = 0; |
| 86 | write_lock(&snd_card_rwlock); |
| 87 | if (idx < 0) { |
| 88 | int idx2; |
| 89 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
| 90 | if (~snd_cards_lock & idx & 1<<idx2) { |
| 91 | idx = idx2; |
| 92 | if (idx >= snd_ecards_limit) |
| 93 | snd_ecards_limit = idx + 1; |
| 94 | break; |
| 95 | } |
| 96 | } else if (idx < snd_ecards_limit) { |
| 97 | if (snd_cards_lock & (1 << idx)) |
| 98 | err = -ENODEV; /* invalid */ |
| 99 | } else if (idx < SNDRV_CARDS) |
| 100 | snd_ecards_limit = idx + 1; /* increase the limit */ |
| 101 | else |
| 102 | err = -ENODEV; |
| 103 | if (idx < 0 || err < 0) { |
| 104 | write_unlock(&snd_card_rwlock); |
| 105 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); |
| 106 | goto __error; |
| 107 | } |
| 108 | snd_cards_lock |= 1 << idx; /* lock it */ |
| 109 | write_unlock(&snd_card_rwlock); |
| 110 | card->number = idx; |
| 111 | card->module = module; |
| 112 | INIT_LIST_HEAD(&card->devices); |
| 113 | init_rwsem(&card->controls_rwsem); |
| 114 | rwlock_init(&card->ctl_files_rwlock); |
| 115 | INIT_LIST_HEAD(&card->controls); |
| 116 | INIT_LIST_HEAD(&card->ctl_files); |
| 117 | spin_lock_init(&card->files_lock); |
| 118 | init_waitqueue_head(&card->shutdown_sleep); |
| 119 | INIT_WORK(&card->free_workq, snd_card_free_thread, card); |
| 120 | #ifdef CONFIG_PM |
| 121 | init_MUTEX(&card->power_lock); |
| 122 | init_waitqueue_head(&card->power_sleep); |
| 123 | #endif |
| 124 | /* the control interface cannot be accessed from the user space until */ |
| 125 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ |
| 126 | if ((err = snd_ctl_create(card)) < 0) { |
| 127 | snd_printd("unable to register control minors\n"); |
| 128 | goto __error; |
| 129 | } |
| 130 | if ((err = snd_info_card_create(card)) < 0) { |
| 131 | snd_printd("unable to create card info\n"); |
| 132 | goto __error_ctl; |
| 133 | } |
| 134 | if (extra_size > 0) |
| 135 | card->private_data = (char *)card + sizeof(snd_card_t); |
| 136 | return card; |
| 137 | |
| 138 | __error_ctl: |
| 139 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); |
| 140 | __error: |
| 141 | kfree(card); |
| 142 | return NULL; |
| 143 | } |
| 144 | |
| 145 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
| 146 | { |
| 147 | return POLLERR | POLLNVAL; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) |
| 152 | * @card: soundcard structure |
| 153 | * |
| 154 | * Disconnects all APIs from the file-operations (user space). |
| 155 | * |
| 156 | * Returns zero, otherwise a negative error code. |
| 157 | * |
| 158 | * Note: The current implementation replaces all active file->f_op with special |
| 159 | * dummy file operations (they do nothing except release). |
| 160 | */ |
| 161 | int snd_card_disconnect(snd_card_t * card) |
| 162 | { |
| 163 | struct snd_monitor_file *mfile; |
| 164 | struct file *file; |
| 165 | struct snd_shutdown_f_ops *s_f_ops; |
| 166 | struct file_operations *f_ops, *old_f_ops; |
| 167 | int err; |
| 168 | |
| 169 | spin_lock(&card->files_lock); |
| 170 | if (card->shutdown) { |
| 171 | spin_unlock(&card->files_lock); |
| 172 | return 0; |
| 173 | } |
| 174 | card->shutdown = 1; |
| 175 | spin_unlock(&card->files_lock); |
| 176 | |
| 177 | /* phase 1: disable fops (user space) operations for ALSA API */ |
| 178 | write_lock(&snd_card_rwlock); |
| 179 | snd_cards[card->number] = NULL; |
| 180 | write_unlock(&snd_card_rwlock); |
| 181 | |
| 182 | /* phase 2: replace file->f_op with special dummy operations */ |
| 183 | |
| 184 | spin_lock(&card->files_lock); |
| 185 | mfile = card->files; |
| 186 | while (mfile) { |
| 187 | file = mfile->file; |
| 188 | |
| 189 | /* it's critical part, use endless loop */ |
| 190 | /* we have no room to fail */ |
| 191 | s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); |
| 192 | if (s_f_ops == NULL) |
| 193 | panic("Atomic allocation failed for snd_shutdown_f_ops!"); |
| 194 | |
| 195 | f_ops = &s_f_ops->f_ops; |
| 196 | |
| 197 | memset(f_ops, 0, sizeof(*f_ops)); |
| 198 | f_ops->owner = file->f_op->owner; |
| 199 | f_ops->release = file->f_op->release; |
| 200 | f_ops->poll = snd_disconnect_poll; |
| 201 | |
| 202 | s_f_ops->next = card->s_f_ops; |
| 203 | card->s_f_ops = s_f_ops; |
| 204 | |
| 205 | f_ops = fops_get(f_ops); |
| 206 | |
| 207 | old_f_ops = file->f_op; |
| 208 | file->f_op = f_ops; /* must be atomic */ |
| 209 | fops_put(old_f_ops); |
| 210 | |
| 211 | mfile = mfile->next; |
| 212 | } |
| 213 | spin_unlock(&card->files_lock); |
| 214 | |
| 215 | /* phase 3: notify all connected devices about disconnection */ |
| 216 | /* at this point, they cannot respond to any calls except release() */ |
| 217 | |
| 218 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 219 | if (snd_mixer_oss_notify_callback) |
| 220 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); |
| 221 | #endif |
| 222 | |
| 223 | /* notify all devices that we are disconnected */ |
| 224 | err = snd_device_disconnect_all(card); |
| 225 | if (err < 0) |
| 226 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 231 | #ifdef CONFIG_SND_GENERIC_DRIVER |
| 232 | static void snd_generic_device_unregister(snd_card_t *card); |
| 233 | #else |
| 234 | #define snd_generic_device_unregister(x) /*NOP*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | #endif |
| 236 | |
| 237 | /** |
| 238 | * snd_card_free - frees given soundcard structure |
| 239 | * @card: soundcard structure |
| 240 | * |
| 241 | * This function releases the soundcard structure and the all assigned |
| 242 | * devices automatically. That is, you don't have to release the devices |
| 243 | * by yourself. |
| 244 | * |
| 245 | * Returns zero. Frees all associated devices and frees the control |
| 246 | * interface associated to given soundcard. |
| 247 | */ |
| 248 | int snd_card_free(snd_card_t * card) |
| 249 | { |
| 250 | struct snd_shutdown_f_ops *s_f_ops; |
| 251 | |
| 252 | if (card == NULL) |
| 253 | return -EINVAL; |
| 254 | write_lock(&snd_card_rwlock); |
| 255 | snd_cards[card->number] = NULL; |
| 256 | write_unlock(&snd_card_rwlock); |
| 257 | |
| 258 | #ifdef CONFIG_PM |
| 259 | wake_up(&card->power_sleep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | /* wait, until all devices are ready for the free operation */ |
| 262 | wait_event(card->shutdown_sleep, card->files == NULL); |
| 263 | |
| 264 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 265 | if (snd_mixer_oss_notify_callback) |
| 266 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); |
| 267 | #endif |
| 268 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { |
| 269 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); |
| 270 | /* Fatal, but this situation should never occur */ |
| 271 | } |
| 272 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { |
| 273 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); |
| 274 | /* Fatal, but this situation should never occur */ |
| 275 | } |
| 276 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { |
| 277 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); |
| 278 | /* Fatal, but this situation should never occur */ |
| 279 | } |
| 280 | if (card->private_free) |
| 281 | card->private_free(card); |
| 282 | if (card->proc_id) |
| 283 | snd_info_unregister(card->proc_id); |
| 284 | if (snd_info_card_free(card) < 0) { |
| 285 | snd_printk(KERN_WARNING "unable to free card info\n"); |
| 286 | /* Not fatal error */ |
| 287 | } |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 288 | snd_generic_device_unregister(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | while (card->s_f_ops) { |
| 290 | s_f_ops = card->s_f_ops; |
| 291 | card->s_f_ops = s_f_ops->next; |
| 292 | kfree(s_f_ops); |
| 293 | } |
| 294 | write_lock(&snd_card_rwlock); |
| 295 | snd_cards_lock &= ~(1 << card->number); |
| 296 | write_unlock(&snd_card_rwlock); |
| 297 | kfree(card); |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static void snd_card_free_thread(void * __card) |
| 302 | { |
| 303 | snd_card_t *card = __card; |
| 304 | struct module * module = card->module; |
| 305 | |
| 306 | if (!try_module_get(module)) { |
| 307 | snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); |
| 308 | module = NULL; |
| 309 | } |
| 310 | |
| 311 | snd_card_free(card); |
| 312 | |
| 313 | module_put(module); |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * snd_card_free_in_thread - call snd_card_free() in thread |
| 318 | * @card: soundcard structure |
| 319 | * |
| 320 | * This function schedules the call of snd_card_free() function in a |
| 321 | * work queue. When all devices are released (non-busy), the work |
| 322 | * is woken up and calls snd_card_free(). |
| 323 | * |
| 324 | * When a card can be disconnected at any time by hotplug service, |
| 325 | * this function should be used in disconnect (or detach) callback |
| 326 | * instead of calling snd_card_free() directly. |
| 327 | * |
| 328 | * Returns - zero otherwise a negative error code if the start of thread failed. |
| 329 | */ |
| 330 | int snd_card_free_in_thread(snd_card_t * card) |
| 331 | { |
| 332 | if (card->files == NULL) { |
| 333 | snd_card_free(card); |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | if (schedule_work(&card->free_workq)) |
| 338 | return 0; |
| 339 | |
| 340 | snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); |
| 341 | /* try to free the structure immediately */ |
| 342 | snd_card_free(card); |
| 343 | return -EFAULT; |
| 344 | } |
| 345 | |
| 346 | static void choose_default_id(snd_card_t * card) |
| 347 | { |
| 348 | int i, len, idx_flag = 0, loops = 8; |
| 349 | char *id, *spos; |
| 350 | |
| 351 | id = spos = card->shortname; |
| 352 | while (*id != '\0') { |
| 353 | if (*id == ' ') |
| 354 | spos = id + 1; |
| 355 | id++; |
| 356 | } |
| 357 | id = card->id; |
| 358 | while (*spos != '\0' && !isalnum(*spos)) |
| 359 | spos++; |
| 360 | if (isdigit(*spos)) |
| 361 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; |
| 362 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
| 363 | if (isalnum(*spos)) |
| 364 | *id++ = *spos; |
| 365 | spos++; |
| 366 | } |
| 367 | *id = '\0'; |
| 368 | |
| 369 | id = card->id; |
| 370 | |
| 371 | if (*id == '\0') |
| 372 | strcpy(id, "default"); |
| 373 | |
| 374 | while (1) { |
| 375 | if (loops-- == 0) { |
| 376 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); |
| 377 | strcpy(card->id, card->proc_root->name); |
| 378 | return; |
| 379 | } |
| 380 | if (!snd_info_check_reserved_words(id)) |
| 381 | goto __change; |
| 382 | for (i = 0; i < snd_ecards_limit; i++) { |
| 383 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) |
| 384 | goto __change; |
| 385 | } |
| 386 | break; |
| 387 | |
| 388 | __change: |
| 389 | len = strlen(id); |
| 390 | if (idx_flag) |
| 391 | id[len-1]++; |
| 392 | else if ((size_t)len <= sizeof(card->id) - 3) { |
| 393 | strcat(id, "_1"); |
| 394 | idx_flag++; |
| 395 | } else { |
| 396 | spos = id + len - 2; |
| 397 | if ((size_t)len <= sizeof(card->id) - 2) |
| 398 | spos++; |
| 399 | *spos++ = '_'; |
| 400 | *spos++ = '1'; |
| 401 | *spos++ = '\0'; |
| 402 | idx_flag++; |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * snd_card_register - register the soundcard |
| 409 | * @card: soundcard structure |
| 410 | * |
| 411 | * This function registers all the devices assigned to the soundcard. |
| 412 | * Until calling this, the ALSA control interface is blocked from the |
| 413 | * external accesses. Thus, you should call this function at the end |
| 414 | * of the initialization of the card. |
| 415 | * |
| 416 | * Returns zero otherwise a negative error code if the registrain failed. |
| 417 | */ |
| 418 | int snd_card_register(snd_card_t * card) |
| 419 | { |
| 420 | int err; |
| 421 | snd_info_entry_t *entry; |
| 422 | |
| 423 | snd_runtime_check(card != NULL, return -EINVAL); |
| 424 | if ((err = snd_device_register_all(card)) < 0) |
| 425 | return err; |
| 426 | write_lock(&snd_card_rwlock); |
| 427 | if (snd_cards[card->number]) { |
| 428 | /* already registered */ |
| 429 | write_unlock(&snd_card_rwlock); |
| 430 | return 0; |
| 431 | } |
| 432 | if (card->id[0] == '\0') |
| 433 | choose_default_id(card); |
| 434 | snd_cards[card->number] = card; |
| 435 | write_unlock(&snd_card_rwlock); |
| 436 | if ((err = snd_info_card_register(card)) < 0) { |
| 437 | snd_printd("unable to create card info\n"); |
| 438 | goto __skip_info; |
| 439 | } |
| 440 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { |
| 441 | snd_printd("unable to create card entry\n"); |
| 442 | goto __skip_info; |
| 443 | } |
| 444 | entry->c.text.read_size = PAGE_SIZE; |
| 445 | entry->c.text.read = snd_card_id_read; |
| 446 | if (snd_info_register(entry) < 0) { |
| 447 | snd_info_free_entry(entry); |
| 448 | entry = NULL; |
| 449 | } |
| 450 | card->proc_id = entry; |
| 451 | __skip_info: |
| 452 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 453 | if (snd_mixer_oss_notify_callback) |
| 454 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); |
| 455 | #endif |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static snd_info_entry_t *snd_card_info_entry = NULL; |
| 460 | |
| 461 | static void snd_card_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) |
| 462 | { |
| 463 | int idx, count; |
| 464 | snd_card_t *card; |
| 465 | |
| 466 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
| 467 | read_lock(&snd_card_rwlock); |
| 468 | if ((card = snd_cards[idx]) != NULL) { |
| 469 | count++; |
| 470 | snd_iprintf(buffer, "%i [%-15s]: %s - %s\n", |
| 471 | idx, |
| 472 | card->id, |
| 473 | card->driver, |
| 474 | card->shortname); |
| 475 | snd_iprintf(buffer, " %s\n", |
| 476 | card->longname); |
| 477 | } |
| 478 | read_unlock(&snd_card_rwlock); |
| 479 | } |
| 480 | if (!count) |
| 481 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
| 482 | } |
| 483 | |
| 484 | #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) |
| 485 | |
| 486 | void snd_card_info_read_oss(snd_info_buffer_t * buffer) |
| 487 | { |
| 488 | int idx, count; |
| 489 | snd_card_t *card; |
| 490 | |
| 491 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
| 492 | read_lock(&snd_card_rwlock); |
| 493 | if ((card = snd_cards[idx]) != NULL) { |
| 494 | count++; |
| 495 | snd_iprintf(buffer, "%s\n", card->longname); |
| 496 | } |
| 497 | read_unlock(&snd_card_rwlock); |
| 498 | } |
| 499 | if (!count) { |
| 500 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | #endif |
| 505 | |
| 506 | #ifdef MODULE |
| 507 | static snd_info_entry_t *snd_card_module_info_entry; |
| 508 | static void snd_card_module_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) |
| 509 | { |
| 510 | int idx; |
| 511 | snd_card_t *card; |
| 512 | |
| 513 | for (idx = 0; idx < SNDRV_CARDS; idx++) { |
| 514 | read_lock(&snd_card_rwlock); |
| 515 | if ((card = snd_cards[idx]) != NULL) |
| 516 | snd_iprintf(buffer, "%i %s\n", idx, card->module->name); |
| 517 | read_unlock(&snd_card_rwlock); |
| 518 | } |
| 519 | } |
| 520 | #endif |
| 521 | |
| 522 | int __init snd_card_info_init(void) |
| 523 | { |
| 524 | snd_info_entry_t *entry; |
| 525 | |
| 526 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); |
| 527 | snd_runtime_check(entry != NULL, return -ENOMEM); |
| 528 | entry->c.text.read_size = PAGE_SIZE; |
| 529 | entry->c.text.read = snd_card_info_read; |
| 530 | if (snd_info_register(entry) < 0) { |
| 531 | snd_info_free_entry(entry); |
| 532 | return -ENOMEM; |
| 533 | } |
| 534 | snd_card_info_entry = entry; |
| 535 | |
| 536 | #ifdef MODULE |
| 537 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); |
| 538 | if (entry) { |
| 539 | entry->c.text.read_size = PAGE_SIZE; |
| 540 | entry->c.text.read = snd_card_module_info_read; |
| 541 | if (snd_info_register(entry) < 0) |
| 542 | snd_info_free_entry(entry); |
| 543 | else |
| 544 | snd_card_module_info_entry = entry; |
| 545 | } |
| 546 | #endif |
| 547 | |
| 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | int __exit snd_card_info_done(void) |
| 552 | { |
| 553 | if (snd_card_info_entry) |
| 554 | snd_info_unregister(snd_card_info_entry); |
| 555 | #ifdef MODULE |
| 556 | if (snd_card_module_info_entry) |
| 557 | snd_info_unregister(snd_card_module_info_entry); |
| 558 | #endif |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | /** |
| 563 | * snd_component_add - add a component string |
| 564 | * @card: soundcard structure |
| 565 | * @component: the component id string |
| 566 | * |
| 567 | * This function adds the component id string to the supported list. |
| 568 | * The component can be referred from the alsa-lib. |
| 569 | * |
| 570 | * Returns zero otherwise a negative error code. |
| 571 | */ |
| 572 | |
| 573 | int snd_component_add(snd_card_t *card, const char *component) |
| 574 | { |
| 575 | char *ptr; |
| 576 | int len = strlen(component); |
| 577 | |
| 578 | ptr = strstr(card->components, component); |
| 579 | if (ptr != NULL) { |
| 580 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ |
| 581 | return 1; |
| 582 | } |
| 583 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { |
| 584 | snd_BUG(); |
| 585 | return -ENOMEM; |
| 586 | } |
| 587 | if (card->components[0] != '\0') |
| 588 | strcat(card->components, " "); |
| 589 | strcat(card->components, component); |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | /** |
| 594 | * snd_card_file_add - add the file to the file list of the card |
| 595 | * @card: soundcard structure |
| 596 | * @file: file pointer |
| 597 | * |
| 598 | * This function adds the file to the file linked-list of the card. |
| 599 | * This linked-list is used to keep tracking the connection state, |
| 600 | * and to avoid the release of busy resources by hotplug. |
| 601 | * |
| 602 | * Returns zero or a negative error code. |
| 603 | */ |
| 604 | int snd_card_file_add(snd_card_t *card, struct file *file) |
| 605 | { |
| 606 | struct snd_monitor_file *mfile; |
| 607 | |
| 608 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); |
| 609 | if (mfile == NULL) |
| 610 | return -ENOMEM; |
| 611 | mfile->file = file; |
| 612 | mfile->next = NULL; |
| 613 | spin_lock(&card->files_lock); |
| 614 | if (card->shutdown) { |
| 615 | spin_unlock(&card->files_lock); |
| 616 | kfree(mfile); |
| 617 | return -ENODEV; |
| 618 | } |
| 619 | mfile->next = card->files; |
| 620 | card->files = mfile; |
| 621 | spin_unlock(&card->files_lock); |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | /** |
| 626 | * snd_card_file_remove - remove the file from the file list |
| 627 | * @card: soundcard structure |
| 628 | * @file: file pointer |
| 629 | * |
| 630 | * This function removes the file formerly added to the card via |
| 631 | * snd_card_file_add() function. |
| 632 | * If all files are removed and the release of the card is |
| 633 | * scheduled, it will wake up the the thread to call snd_card_free() |
| 634 | * (see snd_card_free_in_thread() function). |
| 635 | * |
| 636 | * Returns zero or a negative error code. |
| 637 | */ |
| 638 | int snd_card_file_remove(snd_card_t *card, struct file *file) |
| 639 | { |
| 640 | struct snd_monitor_file *mfile, *pfile = NULL; |
| 641 | |
| 642 | spin_lock(&card->files_lock); |
| 643 | mfile = card->files; |
| 644 | while (mfile) { |
| 645 | if (mfile->file == file) { |
| 646 | if (pfile) |
| 647 | pfile->next = mfile->next; |
| 648 | else |
| 649 | card->files = mfile->next; |
| 650 | break; |
| 651 | } |
| 652 | pfile = mfile; |
| 653 | mfile = mfile->next; |
| 654 | } |
| 655 | spin_unlock(&card->files_lock); |
| 656 | if (card->files == NULL) |
| 657 | wake_up(&card->shutdown_sleep); |
| 658 | if (!mfile) { |
| 659 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
| 660 | return -ENOENT; |
| 661 | } |
| 662 | kfree(mfile); |
| 663 | return 0; |
| 664 | } |
| 665 | |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 666 | #ifdef CONFIG_SND_GENERIC_DRIVER |
| 667 | /* |
| 668 | * generic device without a proper bus using platform_device |
| 669 | * (e.g. ISA) |
| 670 | */ |
| 671 | struct snd_generic_device { |
| 672 | struct platform_device pdev; |
| 673 | snd_card_t *card; |
| 674 | }; |
| 675 | |
| 676 | #define get_snd_generic_card(dev) container_of(to_platform_device(dev), struct snd_generic_device, pdev)->card |
| 677 | |
| 678 | #define SND_GENERIC_NAME "snd_generic" |
| 679 | |
| 680 | #ifdef CONFIG_PM |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 681 | static int snd_generic_suspend(struct device *dev, pm_message_t state); |
| 682 | static int snd_generic_resume(struct device *dev); |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 683 | #endif |
| 684 | |
| 685 | /* initialized in sound.c */ |
| 686 | struct device_driver snd_generic_driver = { |
| 687 | .name = SND_GENERIC_NAME, |
| 688 | .bus = &platform_bus_type, |
| 689 | #ifdef CONFIG_PM |
| 690 | .suspend = snd_generic_suspend, |
| 691 | .resume = snd_generic_resume, |
| 692 | #endif |
| 693 | }; |
| 694 | |
| 695 | void snd_generic_device_release(struct device *dev) |
| 696 | { |
| 697 | } |
| 698 | |
| 699 | static int snd_generic_device_register(snd_card_t *card) |
| 700 | { |
| 701 | struct snd_generic_device *dev; |
| 702 | int err; |
| 703 | |
| 704 | if (card->generic_dev) |
| 705 | return 0; /* already registered */ |
| 706 | |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 707 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 708 | if (! dev) { |
| 709 | snd_printk(KERN_ERR "can't allocate generic_device\n"); |
| 710 | return -ENOMEM; |
| 711 | } |
| 712 | |
| 713 | dev->pdev.name = SND_GENERIC_NAME; |
| 714 | dev->pdev.id = card->number; |
| 715 | dev->pdev.dev.release = snd_generic_device_release; |
| 716 | dev->card = card; |
| 717 | if ((err = platform_device_register(&dev->pdev)) < 0) { |
| 718 | kfree(dev); |
| 719 | return err; |
| 720 | } |
| 721 | card->generic_dev = dev; |
| 722 | return 0; |
| 723 | } |
| 724 | |
| 725 | static void snd_generic_device_unregister(snd_card_t *card) |
| 726 | { |
| 727 | struct snd_generic_device *dev = card->generic_dev; |
| 728 | if (dev) { |
| 729 | platform_device_unregister(&dev->pdev); |
| 730 | kfree(dev); |
| 731 | card->generic_dev = NULL; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /** |
| 736 | * snd_card_set_generic_dev - assign the generic device to the card |
| 737 | * @card: soundcard structure |
| 738 | * |
| 739 | * Assigns a generic device to the card. This function is provided as the |
| 740 | * last resort, for devices without any proper bus. Thus this won't override |
| 741 | * the device already assigned to the card. |
| 742 | * |
| 743 | * Returns zero if successful, or a negative error code. |
| 744 | */ |
| 745 | int snd_card_set_generic_dev(snd_card_t *card) |
| 746 | { |
| 747 | int err; |
| 748 | if ((err = snd_generic_device_register(card)) < 0) |
| 749 | return err; |
| 750 | if (! card->dev) |
| 751 | snd_card_set_dev(card, &card->generic_dev->pdev.dev); |
| 752 | return 0; |
| 753 | } |
| 754 | #endif /* CONFIG_SND_GENERIC_DRIVER */ |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | #ifdef CONFIG_PM |
| 757 | /** |
| 758 | * snd_power_wait - wait until the power-state is changed. |
| 759 | * @card: soundcard structure |
| 760 | * @power_state: expected power state |
| 761 | * @file: file structure for the O_NONBLOCK check (optional) |
| 762 | * |
| 763 | * Waits until the power-state is changed. |
| 764 | * |
| 765 | * Note: the power lock must be active before call. |
| 766 | */ |
| 767 | int snd_power_wait(snd_card_t *card, unsigned int power_state, struct file *file) |
| 768 | { |
| 769 | wait_queue_t wait; |
| 770 | int result = 0; |
| 771 | |
| 772 | /* fastpath */ |
| 773 | if (snd_power_get_state(card) == power_state) |
| 774 | return 0; |
| 775 | init_waitqueue_entry(&wait, current); |
| 776 | add_wait_queue(&card->power_sleep, &wait); |
| 777 | while (1) { |
| 778 | if (card->shutdown) { |
| 779 | result = -ENODEV; |
| 780 | break; |
| 781 | } |
| 782 | if (snd_power_get_state(card) == power_state) |
| 783 | break; |
| 784 | #if 0 /* block all devices */ |
| 785 | if (file && (file->f_flags & O_NONBLOCK)) { |
| 786 | result = -EAGAIN; |
| 787 | break; |
| 788 | } |
| 789 | #endif |
| 790 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 791 | snd_power_unlock(card); |
| 792 | schedule_timeout(30 * HZ); |
| 793 | snd_power_lock(card); |
| 794 | } |
| 795 | remove_wait_queue(&card->power_sleep, &wait); |
| 796 | return result; |
| 797 | } |
| 798 | |
| 799 | /** |
| 800 | * snd_card_set_pm_callback - set the PCI power-management callbacks |
| 801 | * @card: soundcard structure |
| 802 | * @suspend: suspend callback function |
| 803 | * @resume: resume callback function |
| 804 | * @private_data: private data to pass to the callback functions |
| 805 | * |
| 806 | * Sets the power-management callback functions of the card. |
| 807 | * These callbacks are called from ALSA's common PCI suspend/resume |
| 808 | * handler and from the control API. |
| 809 | */ |
| 810 | int snd_card_set_pm_callback(snd_card_t *card, |
| 811 | int (*suspend)(snd_card_t *, pm_message_t), |
| 812 | int (*resume)(snd_card_t *), |
| 813 | void *private_data) |
| 814 | { |
| 815 | card->pm_suspend = suspend; |
| 816 | card->pm_resume = resume; |
| 817 | card->pm_private_data = private_data; |
| 818 | return 0; |
| 819 | } |
| 820 | |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 821 | #ifdef CONFIG_SND_GENERIC_DRIVER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | /* suspend/resume callbacks for snd_generic platform device */ |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 823 | static int snd_generic_suspend(struct device *dev, pm_message_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | { |
| 825 | snd_card_t *card; |
| 826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | card = get_snd_generic_card(dev); |
| 828 | if (card->power_state == SNDRV_CTL_POWER_D3hot) |
| 829 | return 0; |
Takashi Iwai | d5c5d8f | 2005-10-24 18:16:50 +0200 | [diff] [blame] | 830 | if (card->pm_suspend) |
| 831 | card->pm_suspend(card, PMSG_SUSPEND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); |
| 833 | return 0; |
| 834 | } |
| 835 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 836 | static int snd_generic_resume(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | { |
| 838 | snd_card_t *card; |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | card = get_snd_generic_card(dev); |
| 841 | if (card->power_state == SNDRV_CTL_POWER_D0) |
| 842 | return 0; |
Takashi Iwai | d5c5d8f | 2005-10-24 18:16:50 +0200 | [diff] [blame] | 843 | if (card->pm_suspend) |
| 844 | card->pm_resume(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
| 846 | return 0; |
| 847 | } |
| 848 | |
| 849 | /** |
| 850 | * snd_card_set_generic_pm_callback - set the generic power-management callbacks |
| 851 | * @card: soundcard structure |
| 852 | * @suspend: suspend callback function |
| 853 | * @resume: resume callback function |
| 854 | * @private_data: private data to pass to the callback functions |
| 855 | * |
| 856 | * Registers the power-management and sets the lowlevel callbacks for |
| 857 | * the given card. These callbacks are called from the ALSA's common |
| 858 | * PM handler and from the control API. |
| 859 | */ |
| 860 | int snd_card_set_generic_pm_callback(snd_card_t *card, |
| 861 | int (*suspend)(snd_card_t *, pm_message_t), |
| 862 | int (*resume)(snd_card_t *), |
| 863 | void *private_data) |
| 864 | { |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 865 | int err; |
| 866 | if ((err = snd_generic_device_register(card)) < 0) |
| 867 | return err; |
| 868 | return snd_card_set_pm_callback(card, suspend, resume, private_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
Takashi Iwai | ecbcfe3 | 2005-09-05 17:15:37 +0200 | [diff] [blame] | 870 | #endif /* CONFIG_SND_GENERIC_DRIVER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
| 872 | #ifdef CONFIG_PCI |
| 873 | int snd_card_pci_suspend(struct pci_dev *dev, pm_message_t state) |
| 874 | { |
| 875 | snd_card_t *card = pci_get_drvdata(dev); |
| 876 | int err; |
| 877 | if (! card || ! card->pm_suspend) |
| 878 | return 0; |
| 879 | if (card->power_state == SNDRV_CTL_POWER_D3hot) |
| 880 | return 0; |
| 881 | err = card->pm_suspend(card, PMSG_SUSPEND); |
| 882 | pci_save_state(dev); |
| 883 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); |
| 884 | return err; |
| 885 | } |
| 886 | |
| 887 | int snd_card_pci_resume(struct pci_dev *dev) |
| 888 | { |
| 889 | snd_card_t *card = pci_get_drvdata(dev); |
| 890 | if (! card || ! card->pm_resume) |
| 891 | return 0; |
| 892 | if (card->power_state == SNDRV_CTL_POWER_D0) |
| 893 | return 0; |
| 894 | /* restore the PCI config space */ |
| 895 | pci_restore_state(dev); |
| 896 | card->pm_resume(card); |
| 897 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
| 898 | return 0; |
| 899 | } |
| 900 | #endif |
| 901 | |
| 902 | #endif /* CONFIG_PM */ |