Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Initialization routines |
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/sched.h> |
Paul Gortmaker | da155d5 | 2011-07-15 12:38:28 -0400 | [diff] [blame] | 24 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/file.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/pm.h> |
Steve Muckle | f132c6c | 2012-06-06 18:30:57 -0700 | [diff] [blame] | 30 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <sound/core.h> |
| 32 | #include <sound/control.h> |
| 33 | #include <sound/info.h> |
| 34 | |
Takashi Iwai | 82a783f | 2009-09-07 15:50:18 +0200 | [diff] [blame] | 35 | /* monitor files for graceful shutdown (hotplug) */ |
| 36 | struct snd_monitor_file { |
| 37 | struct file *file; |
| 38 | const struct file_operations *disconnected_f_op; |
| 39 | struct list_head shutdown_list; /* still need to shutdown */ |
| 40 | struct list_head list; /* link of monitor files */ |
| 41 | }; |
| 42 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 43 | static DEFINE_SPINLOCK(shutdown_lock); |
| 44 | static LIST_HEAD(shutdown_files); |
| 45 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 46 | static const struct file_operations snd_shutdown_f_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Takashi Iwai | 6581f4e | 2006-05-17 17:14:51 +0200 | [diff] [blame] | 48 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
| 49 | struct snd_card *snd_cards[SNDRV_CARDS]; |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 50 | EXPORT_SYMBOL(snd_cards); |
| 51 | |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 52 | static DEFINE_MUTEX(snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 54 | static char *slots[SNDRV_CARDS]; |
| 55 | module_param_array(slots, charp, NULL, 0444); |
| 56 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); |
| 57 | |
Joonwoo Park | 6fb6439 | 2013-08-07 18:59:09 -0700 | [diff] [blame^] | 58 | #define SND_CARD_STATE_MAX_LEN 16 |
| 59 | |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 60 | /* return non-zero if the given index is reserved for the given |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 61 | * module via slots option |
| 62 | */ |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 63 | static int module_slot_match(struct module *module, int idx) |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 64 | { |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 65 | int match = 1; |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 66 | #ifdef MODULE |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 67 | const char *s1, *s2; |
| 68 | |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 69 | if (!module || !module->name || !slots[idx]) |
| 70 | return 0; |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 71 | |
| 72 | s1 = module->name; |
| 73 | s2 = slots[idx]; |
| 74 | if (*s2 == '!') { |
| 75 | match = 0; /* negative match */ |
| 76 | s2++; |
| 77 | } |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 78 | /* compare module name strings |
| 79 | * hyphens are handled as equivalent with underscore |
| 80 | */ |
| 81 | for (;;) { |
| 82 | char c1 = *s1++; |
| 83 | char c2 = *s2++; |
| 84 | if (c1 == '-') |
| 85 | c1 = '_'; |
| 86 | if (c2 == '-') |
| 87 | c2 = '_'; |
| 88 | if (c1 != c2) |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 89 | return !match; |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 90 | if (!c1) |
| 91 | break; |
| 92 | } |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 93 | #endif /* MODULE */ |
| 94 | return match; |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 95 | } |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 98 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 99 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #endif |
| 101 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 102 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 103 | static void snd_card_id_read(struct snd_info_entry *entry, |
| 104 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
| 106 | snd_iprintf(buffer, "%s\n", entry->card->id); |
| 107 | } |
| 108 | |
Joonwoo Park | 6fb6439 | 2013-08-07 18:59:09 -0700 | [diff] [blame^] | 109 | static int snd_card_state_read(struct snd_info_entry *entry, |
| 110 | void *file_private_data, struct file *file, |
| 111 | char __user *buf, size_t count, loff_t pos) |
| 112 | { |
| 113 | int len; |
| 114 | char buffer[SND_CARD_STATE_MAX_LEN]; |
| 115 | |
| 116 | /* make sure offline is updated prior to wake up */ |
| 117 | rmb(); |
| 118 | len = snprintf(buffer, sizeof(buffer), "%s\n", |
| 119 | entry->card->offline ? "OFFLINE" : "ONLINE"); |
| 120 | return simple_read_from_buffer(buf, count, &pos, buffer, len); |
| 121 | } |
| 122 | |
| 123 | static unsigned int snd_card_state_poll(struct snd_info_entry *entry, |
| 124 | void *private_data, struct file *file, |
| 125 | poll_table *wait) |
| 126 | { |
| 127 | poll_wait(file, &entry->card->offline_poll_wait, wait); |
| 128 | if (xchg(&entry->card->offline_change, 0)) |
| 129 | return POLLIN | POLLPRI | POLLRDNORM; |
| 130 | else |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | static struct snd_info_entry_ops snd_card_state_proc_ops = { |
| 135 | .read = snd_card_state_read, |
| 136 | .poll = snd_card_state_poll, |
| 137 | }; |
| 138 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 139 | static inline int init_info_for_card(struct snd_card *card) |
| 140 | { |
| 141 | int err; |
Joonwoo Park | 6fb6439 | 2013-08-07 18:59:09 -0700 | [diff] [blame^] | 142 | struct snd_info_entry *entry, *entry_state; |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 143 | |
| 144 | if ((err = snd_info_card_register(card)) < 0) { |
| 145 | snd_printd("unable to create card info\n"); |
| 146 | return err; |
| 147 | } |
| 148 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { |
| 149 | snd_printd("unable to create card entry\n"); |
| 150 | return err; |
| 151 | } |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 152 | entry->c.text.read = snd_card_id_read; |
| 153 | if (snd_info_register(entry) < 0) { |
| 154 | snd_info_free_entry(entry); |
| 155 | entry = NULL; |
| 156 | } |
| 157 | card->proc_id = entry; |
Joonwoo Park | 6fb6439 | 2013-08-07 18:59:09 -0700 | [diff] [blame^] | 158 | |
| 159 | entry_state = snd_info_create_card_entry(card, "state", |
| 160 | card->proc_root); |
| 161 | if (entry_state == NULL) { |
| 162 | snd_printd("unable to create card entry state\n"); |
| 163 | card->proc_id = NULL; |
| 164 | return err; |
| 165 | } |
| 166 | entry_state->size = SND_CARD_STATE_MAX_LEN; |
| 167 | entry_state->content = SNDRV_INFO_CONTENT_DATA; |
| 168 | entry_state->c.ops = &snd_card_state_proc_ops; |
| 169 | err = snd_info_register(entry_state); |
| 170 | if (err < 0) { |
| 171 | snd_printd("unable to register card entry state\n"); |
| 172 | card->proc_id = NULL; |
| 173 | return err; |
| 174 | } |
| 175 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | #else /* !CONFIG_PROC_FS */ |
| 179 | #define init_info_for_card(card) |
| 180 | #endif |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | /** |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 183 | * snd_card_create - create and initialize a soundcard structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
| 185 | * @xid: card identification (ASCII string) |
| 186 | * @module: top level module for locking |
| 187 | * @extra_size: allocate this extra size after the main soundcard structure |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 188 | * @card_ret: the pointer to store the created card instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | * |
| 190 | * Creates and initializes a soundcard structure. |
| 191 | * |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 192 | * The function allocates snd_card instance via kzalloc with the given |
| 193 | * space for the driver to use freely. The allocated struct is stored |
| 194 | * in the given card_ret pointer. |
| 195 | * |
| 196 | * Returns zero if successful or a negative error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | */ |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 198 | int snd_card_create(int idx, const char *xid, |
| 199 | struct module *module, int extra_size, |
| 200 | struct snd_card **card_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 202 | struct snd_card *card; |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 203 | int err, idx2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 205 | if (snd_BUG_ON(!card_ret)) |
| 206 | return -EINVAL; |
| 207 | *card_ret = NULL; |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | if (extra_size < 0) |
| 210 | extra_size = 0; |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 211 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 212 | if (!card) |
| 213 | return -ENOMEM; |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 214 | if (xid) |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 215 | strlcpy(card->id, xid, sizeof(card->id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | err = 0; |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 217 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (idx < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
Oliver Neukum | 5c33dd7 | 2007-01-16 17:49:21 +0100 | [diff] [blame] | 220 | /* idx == -1 == 0xffff means: take any free slot */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | if (~snd_cards_lock & idx & 1<<idx2) { |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 222 | if (module_slot_match(module, idx2)) { |
| 223 | idx = idx2; |
| 224 | break; |
| 225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
Oliver Neukum | 5c33dd7 | 2007-01-16 17:49:21 +0100 | [diff] [blame] | 227 | } |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 228 | if (idx < 0) { |
| 229 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
| 230 | /* idx == -1 == 0xffff means: take any free slot */ |
| 231 | if (~snd_cards_lock & idx & 1<<idx2) { |
| 232 | if (!slots[idx2] || !*slots[idx2]) { |
| 233 | idx = idx2; |
| 234 | break; |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | if (idx < 0) |
| 239 | err = -ENODEV; |
| 240 | else if (idx < snd_ecards_limit) { |
| 241 | if (snd_cards_lock & (1 << idx)) |
| 242 | err = -EBUSY; /* invalid */ |
| 243 | } else if (idx >= SNDRV_CARDS) |
| 244 | err = -ENODEV; |
| 245 | if (err < 0) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 246 | mutex_unlock(&snd_card_mutex); |
Oliver Neukum | 5c33dd7 | 2007-01-16 17:49:21 +0100 | [diff] [blame] | 247 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
| 248 | idx, snd_ecards_limit - 1, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | goto __error; |
| 250 | } |
| 251 | snd_cards_lock |= 1 << idx; /* lock it */ |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 252 | if (idx >= snd_ecards_limit) |
| 253 | snd_ecards_limit = idx + 1; /* increase the limit */ |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 254 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | card->number = idx; |
| 256 | card->module = module; |
| 257 | INIT_LIST_HEAD(&card->devices); |
| 258 | init_rwsem(&card->controls_rwsem); |
| 259 | rwlock_init(&card->ctl_files_rwlock); |
| 260 | INIT_LIST_HEAD(&card->controls); |
| 261 | INIT_LIST_HEAD(&card->ctl_files); |
| 262 | spin_lock_init(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 263 | INIT_LIST_HEAD(&card->files_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | init_waitqueue_head(&card->shutdown_sleep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | #ifdef CONFIG_PM |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 266 | mutex_init(&card->power_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | init_waitqueue_head(&card->power_sleep); |
| 268 | #endif |
Joonwoo Park | 6fb6439 | 2013-08-07 18:59:09 -0700 | [diff] [blame^] | 269 | init_waitqueue_head(&card->offline_poll_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /* the control interface cannot be accessed from the user space until */ |
| 271 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 272 | err = snd_ctl_create(card); |
| 273 | if (err < 0) { |
| 274 | snd_printk(KERN_ERR "unable to register control minors\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | goto __error; |
| 276 | } |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 277 | err = snd_info_card_create(card); |
| 278 | if (err < 0) { |
| 279 | snd_printk(KERN_ERR "unable to create card info\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | goto __error_ctl; |
| 281 | } |
| 282 | if (extra_size > 0) |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 283 | card->private_data = (char *)card + sizeof(struct snd_card); |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 284 | *card_ret = card; |
| 285 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | __error_ctl: |
| 288 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); |
| 289 | __error: |
| 290 | kfree(card); |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 291 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 293 | EXPORT_SYMBOL(snd_card_create); |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 294 | |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 295 | /* return non-zero if a card is already locked */ |
| 296 | int snd_card_locked(int card) |
| 297 | { |
| 298 | int locked; |
| 299 | |
| 300 | mutex_lock(&snd_card_mutex); |
| 301 | locked = snd_cards_lock & (1 << card); |
| 302 | mutex_unlock(&snd_card_mutex); |
| 303 | return locked; |
| 304 | } |
| 305 | |
Clemens Ladisch | b3b0abe | 2006-03-03 14:08:43 +0100 | [diff] [blame] | 306 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
| 307 | { |
| 308 | return -ENODEV; |
| 309 | } |
| 310 | |
| 311 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, |
| 312 | size_t count, loff_t *offset) |
| 313 | { |
| 314 | return -ENODEV; |
| 315 | } |
| 316 | |
| 317 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, |
| 318 | size_t count, loff_t *offset) |
| 319 | { |
| 320 | return -ENODEV; |
| 321 | } |
| 322 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 323 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
| 324 | { |
| 325 | struct snd_monitor_file *df = NULL, *_df; |
| 326 | |
| 327 | spin_lock(&shutdown_lock); |
| 328 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { |
| 329 | if (_df->file == file) { |
| 330 | df = _df; |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 331 | list_del_init(&df->shutdown_list); |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 332 | break; |
| 333 | } |
| 334 | } |
| 335 | spin_unlock(&shutdown_lock); |
| 336 | |
Al Viro | 233e70f | 2008-10-31 23:28:30 +0000 | [diff] [blame] | 337 | if (likely(df)) { |
| 338 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) |
| 339 | df->disconnected_f_op->fasync(-1, file, 0); |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 340 | return df->disconnected_f_op->release(inode, file); |
Al Viro | 233e70f | 2008-10-31 23:28:30 +0000 | [diff] [blame] | 341 | } |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 342 | |
Harvey Harrison | 9bf8e7d | 2008-03-03 15:32:18 -0800 | [diff] [blame] | 343 | panic("%s(%p, %p) failed!", __func__, inode, file); |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 344 | } |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
| 347 | { |
| 348 | return POLLERR | POLLNVAL; |
| 349 | } |
| 350 | |
Clemens Ladisch | b3b0abe | 2006-03-03 14:08:43 +0100 | [diff] [blame] | 351 | static long snd_disconnect_ioctl(struct file *file, |
| 352 | unsigned int cmd, unsigned long arg) |
| 353 | { |
| 354 | return -ENODEV; |
| 355 | } |
| 356 | |
| 357 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) |
| 358 | { |
| 359 | return -ENODEV; |
| 360 | } |
| 361 | |
| 362 | static int snd_disconnect_fasync(int fd, struct file *file, int on) |
| 363 | { |
| 364 | return -ENODEV; |
| 365 | } |
| 366 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 367 | static const struct file_operations snd_shutdown_f_ops = |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 368 | { |
| 369 | .owner = THIS_MODULE, |
| 370 | .llseek = snd_disconnect_llseek, |
| 371 | .read = snd_disconnect_read, |
| 372 | .write = snd_disconnect_write, |
| 373 | .release = snd_disconnect_release, |
| 374 | .poll = snd_disconnect_poll, |
| 375 | .unlocked_ioctl = snd_disconnect_ioctl, |
| 376 | #ifdef CONFIG_COMPAT |
| 377 | .compat_ioctl = snd_disconnect_ioctl, |
| 378 | #endif |
| 379 | .mmap = snd_disconnect_mmap, |
| 380 | .fasync = snd_disconnect_fasync |
| 381 | }; |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | /** |
| 384 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) |
| 385 | * @card: soundcard structure |
| 386 | * |
| 387 | * Disconnects all APIs from the file-operations (user space). |
| 388 | * |
| 389 | * Returns zero, otherwise a negative error code. |
| 390 | * |
| 391 | * Note: The current implementation replaces all active file->f_op with special |
| 392 | * dummy file operations (they do nothing except release). |
| 393 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 394 | int snd_card_disconnect(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
| 396 | struct snd_monitor_file *mfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | int err; |
| 398 | |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 399 | if (!card) |
| 400 | return -EINVAL; |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | spin_lock(&card->files_lock); |
| 403 | if (card->shutdown) { |
| 404 | spin_unlock(&card->files_lock); |
| 405 | return 0; |
| 406 | } |
| 407 | card->shutdown = 1; |
| 408 | spin_unlock(&card->files_lock); |
| 409 | |
| 410 | /* phase 1: disable fops (user space) operations for ALSA API */ |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 411 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | snd_cards[card->number] = NULL; |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 413 | snd_cards_lock &= ~(1 << card->number); |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 414 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
| 416 | /* phase 2: replace file->f_op with special dummy operations */ |
| 417 | |
| 418 | spin_lock(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 419 | list_for_each_entry(mfile, &card->files_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | /* it's critical part, use endless loop */ |
| 421 | /* we have no room to fail */ |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 422 | mfile->disconnected_f_op = mfile->file->f_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 424 | spin_lock(&shutdown_lock); |
| 425 | list_add(&mfile->shutdown_list, &shutdown_files); |
| 426 | spin_unlock(&shutdown_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 428 | mfile->file->f_op = &snd_shutdown_f_ops; |
Miguel Boton | bc9abce | 2008-01-13 12:03:53 +0100 | [diff] [blame] | 429 | fops_get(mfile->file->f_op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | spin_unlock(&card->files_lock); |
| 432 | |
| 433 | /* phase 3: notify all connected devices about disconnection */ |
| 434 | /* at this point, they cannot respond to any calls except release() */ |
| 435 | |
| 436 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 437 | if (snd_mixer_oss_notify_callback) |
| 438 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); |
| 439 | #endif |
| 440 | |
| 441 | /* notify all devices that we are disconnected */ |
| 442 | err = snd_device_disconnect_all(card); |
| 443 | if (err < 0) |
| 444 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); |
| 445 | |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 446 | snd_info_card_disconnect(card); |
Takashi Iwai | 73d38b1 | 2008-04-17 12:50:47 +0200 | [diff] [blame] | 447 | if (card->card_dev) { |
| 448 | device_unregister(card->card_dev); |
| 449 | card->card_dev = NULL; |
| 450 | } |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 451 | #ifdef CONFIG_PM |
| 452 | wake_up(&card->power_sleep); |
| 453 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | return 0; |
| 455 | } |
| 456 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 457 | EXPORT_SYMBOL(snd_card_disconnect); |
| 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | /** |
| 460 | * snd_card_free - frees given soundcard structure |
| 461 | * @card: soundcard structure |
| 462 | * |
| 463 | * This function releases the soundcard structure and the all assigned |
| 464 | * devices automatically. That is, you don't have to release the devices |
| 465 | * by yourself. |
| 466 | * |
| 467 | * Returns zero. Frees all associated devices and frees the control |
| 468 | * interface associated to given soundcard. |
| 469 | */ |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 470 | static int snd_card_do_free(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 473 | if (snd_mixer_oss_notify_callback) |
| 474 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); |
| 475 | #endif |
| 476 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { |
| 477 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); |
| 478 | /* Fatal, but this situation should never occur */ |
| 479 | } |
| 480 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { |
| 481 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); |
| 482 | /* Fatal, but this situation should never occur */ |
| 483 | } |
| 484 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { |
| 485 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); |
| 486 | /* Fatal, but this situation should never occur */ |
| 487 | } |
| 488 | if (card->private_free) |
| 489 | card->private_free(card); |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 490 | snd_info_free_entry(card->proc_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | if (snd_info_card_free(card) < 0) { |
| 492 | snd_printk(KERN_WARNING "unable to free card info\n"); |
| 493 | /* Not fatal error */ |
| 494 | } |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 495 | kfree(card); |
| 496 | return 0; |
| 497 | } |
| 498 | |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 499 | int snd_card_free_when_closed(struct snd_card *card) |
| 500 | { |
| 501 | int free_now = 0; |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 502 | int ret = snd_card_disconnect(card); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 503 | if (ret) |
| 504 | return ret; |
| 505 | |
| 506 | spin_lock(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 507 | if (list_empty(&card->files_list)) |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 508 | free_now = 1; |
| 509 | else |
| 510 | card->free_on_last_close = 1; |
| 511 | spin_unlock(&card->files_lock); |
| 512 | |
| 513 | if (free_now) |
| 514 | snd_card_do_free(card); |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | EXPORT_SYMBOL(snd_card_free_when_closed); |
| 519 | |
| 520 | int snd_card_free(struct snd_card *card) |
| 521 | { |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 522 | int ret = snd_card_disconnect(card); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 523 | if (ret) |
| 524 | return ret; |
| 525 | |
| 526 | /* wait, until all devices are ready for the free operation */ |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 527 | wait_event(card->shutdown_sleep, list_empty(&card->files_list)); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 528 | snd_card_do_free(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | return 0; |
| 530 | } |
| 531 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 532 | EXPORT_SYMBOL(snd_card_free); |
| 533 | |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 534 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 536 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 537 | const char *spos, *src; |
| 538 | char *id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 540 | if (nid == NULL) { |
| 541 | id = card->shortname; |
| 542 | spos = src = id; |
| 543 | while (*id != '\0') { |
| 544 | if (*id == ' ') |
| 545 | spos = id + 1; |
| 546 | id++; |
| 547 | } |
| 548 | } else { |
| 549 | spos = src = nid; |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | id = card->id; |
| 552 | while (*spos != '\0' && !isalnum(*spos)) |
| 553 | spos++; |
| 554 | if (isdigit(*spos)) |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 555 | *id++ = isalpha(src[0]) ? src[0] : 'D'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
| 557 | if (isalnum(*spos)) |
| 558 | *id++ = *spos; |
| 559 | spos++; |
| 560 | } |
| 561 | *id = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | id = card->id; |
| 564 | |
| 565 | if (*id == '\0') |
| 566 | strcpy(id, "Default"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | while (1) { |
| 569 | if (loops-- == 0) { |
| 570 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); |
| 571 | strcpy(card->id, card->proc_root->name); |
| 572 | return; |
| 573 | } |
| 574 | if (!snd_info_check_reserved_words(id)) |
| 575 | goto __change; |
| 576 | for (i = 0; i < snd_ecards_limit; i++) { |
| 577 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) |
| 578 | goto __change; |
| 579 | } |
| 580 | break; |
| 581 | |
| 582 | __change: |
| 583 | len = strlen(id); |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 584 | if (idx_flag) { |
| 585 | if (id[len-1] != '9') |
| 586 | id[len-1]++; |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 587 | else |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 588 | id[len-1] = 'A'; |
| 589 | } else if ((size_t)len <= sizeof(card->id) - 3) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | strcat(id, "_1"); |
| 591 | idx_flag++; |
| 592 | } else { |
| 593 | spos = id + len - 2; |
| 594 | if ((size_t)len <= sizeof(card->id) - 2) |
| 595 | spos++; |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 596 | *(char *)spos++ = '_'; |
| 597 | *(char *)spos++ = '1'; |
| 598 | *(char *)spos++ = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | idx_flag++; |
| 600 | } |
| 601 | } |
| 602 | } |
| 603 | |
Mark Brown | 872c782 | 2009-06-03 20:43:29 +0100 | [diff] [blame] | 604 | /** |
| 605 | * snd_card_set_id - set card identification name |
| 606 | * @card: soundcard structure |
| 607 | * @nid: new identification string |
| 608 | * |
| 609 | * This function sets the card identification and checks for name |
| 610 | * collisions. |
| 611 | */ |
| 612 | void snd_card_set_id(struct snd_card *card, const char *nid) |
| 613 | { |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 614 | /* check if user specified own card->id */ |
| 615 | if (card->id[0] != '\0') |
| 616 | return; |
| 617 | mutex_lock(&snd_card_mutex); |
| 618 | snd_card_set_id_no_lock(card, nid); |
| 619 | mutex_unlock(&snd_card_mutex); |
Mark Brown | 872c782 | 2009-06-03 20:43:29 +0100 | [diff] [blame] | 620 | } |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 621 | EXPORT_SYMBOL(snd_card_set_id); |
| 622 | |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 623 | static ssize_t |
| 624 | card_id_show_attr(struct device *dev, |
| 625 | struct device_attribute *attr, char *buf) |
| 626 | { |
| 627 | struct snd_card *card = dev_get_drvdata(dev); |
| 628 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); |
| 629 | } |
| 630 | |
| 631 | static ssize_t |
| 632 | card_id_store_attr(struct device *dev, struct device_attribute *attr, |
| 633 | const char *buf, size_t count) |
| 634 | { |
| 635 | struct snd_card *card = dev_get_drvdata(dev); |
| 636 | char buf1[sizeof(card->id)]; |
| 637 | size_t copy = count > sizeof(card->id) - 1 ? |
| 638 | sizeof(card->id) - 1 : count; |
| 639 | size_t idx; |
| 640 | int c; |
| 641 | |
| 642 | for (idx = 0; idx < copy; idx++) { |
| 643 | c = buf[idx]; |
| 644 | if (!isalnum(c) && c != '_' && c != '-') |
| 645 | return -EINVAL; |
| 646 | } |
| 647 | memcpy(buf1, buf, copy); |
| 648 | buf1[copy] = '\0'; |
| 649 | mutex_lock(&snd_card_mutex); |
| 650 | if (!snd_info_check_reserved_words(buf1)) { |
| 651 | __exist: |
| 652 | mutex_unlock(&snd_card_mutex); |
| 653 | return -EEXIST; |
| 654 | } |
| 655 | for (idx = 0; idx < snd_ecards_limit; idx++) { |
Peter Ujfalusi | 4437ecd | 2010-09-16 10:26:54 +0300 | [diff] [blame] | 656 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) { |
| 657 | if (card == snd_cards[idx]) |
| 658 | goto __ok; |
| 659 | else |
| 660 | goto __exist; |
| 661 | } |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 662 | } |
| 663 | strcpy(card->id, buf1); |
Jaroslav Kysela | c2eb9c4 | 2008-11-12 16:31:37 +0100 | [diff] [blame] | 664 | snd_info_card_id_change(card); |
Peter Ujfalusi | 4437ecd | 2010-09-16 10:26:54 +0300 | [diff] [blame] | 665 | __ok: |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 666 | mutex_unlock(&snd_card_mutex); |
| 667 | |
| 668 | return count; |
| 669 | } |
| 670 | |
| 671 | static struct device_attribute card_id_attrs = |
| 672 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); |
| 673 | |
| 674 | static ssize_t |
| 675 | card_number_show_attr(struct device *dev, |
| 676 | struct device_attribute *attr, char *buf) |
| 677 | { |
| 678 | struct snd_card *card = dev_get_drvdata(dev); |
| 679 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); |
| 680 | } |
| 681 | |
| 682 | static struct device_attribute card_number_attrs = |
| 683 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | /** |
| 686 | * snd_card_register - register the soundcard |
| 687 | * @card: soundcard structure |
| 688 | * |
| 689 | * This function registers all the devices assigned to the soundcard. |
| 690 | * Until calling this, the ALSA control interface is blocked from the |
| 691 | * external accesses. Thus, you should call this function at the end |
| 692 | * of the initialization of the card. |
| 693 | * |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 694 | * Returns zero otherwise a negative error code if the registration failed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 696 | int snd_card_register(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | { |
| 698 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 700 | if (snd_BUG_ON(!card)) |
| 701 | return -EINVAL; |
Kay Sievers | 39aba96 | 2010-09-04 22:33:14 -0700 | [diff] [blame] | 702 | |
Takashi Iwai | 7d2aae1 | 2007-01-26 12:40:31 +0100 | [diff] [blame] | 703 | if (!card->card_dev) { |
Greg Kroah-Hartman | abe9ab8 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 704 | card->card_dev = device_create(sound_class, card->dev, |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 705 | MKDEV(0, 0), card, |
Greg Kroah-Hartman | abe9ab8 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 706 | "card%i", card->number); |
Takashi Iwai | 7d2aae1 | 2007-01-26 12:40:31 +0100 | [diff] [blame] | 707 | if (IS_ERR(card->card_dev)) |
| 708 | card->card_dev = NULL; |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 709 | } |
Kay Sievers | 39aba96 | 2010-09-04 22:33:14 -0700 | [diff] [blame] | 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | if ((err = snd_device_register_all(card)) < 0) |
| 712 | return err; |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 713 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | if (snd_cards[card->number]) { |
| 715 | /* already registered */ |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 716 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | return 0; |
| 718 | } |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 719 | snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | snd_cards[card->number] = card; |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 721 | mutex_unlock(&snd_card_mutex); |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 722 | init_info_for_card(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 724 | if (snd_mixer_oss_notify_callback) |
| 725 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); |
| 726 | #endif |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 727 | if (card->card_dev) { |
Hannes Eder | 2af7529 | 2008-11-18 12:25:06 -0500 | [diff] [blame] | 728 | err = device_create_file(card->card_dev, &card_id_attrs); |
| 729 | if (err < 0) |
| 730 | return err; |
| 731 | err = device_create_file(card->card_dev, &card_number_attrs); |
| 732 | if (err < 0) |
| 733 | return err; |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 734 | } |
Kay Sievers | 39aba96 | 2010-09-04 22:33:14 -0700 | [diff] [blame] | 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | return 0; |
| 737 | } |
| 738 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 739 | EXPORT_SYMBOL(snd_card_register); |
| 740 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 741 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | 6581f4e | 2006-05-17 17:14:51 +0200 | [diff] [blame] | 742 | static struct snd_info_entry *snd_card_info_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
Takashi Iwai | a381a7a | 2005-11-17 15:55:49 +0100 | [diff] [blame] | 744 | static void snd_card_info_read(struct snd_info_entry *entry, |
| 745 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | { |
| 747 | int idx, count; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 748 | struct snd_card *card; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
| 750 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 751 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | if ((card = snd_cards[idx]) != NULL) { |
| 753 | count++; |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 754 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | idx, |
| 756 | card->id, |
| 757 | card->driver, |
| 758 | card->shortname); |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 759 | snd_iprintf(buffer, " %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | card->longname); |
| 761 | } |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 762 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | if (!count) |
| 765 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
| 766 | } |
| 767 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 768 | #ifdef CONFIG_SND_OSSEMUL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 770 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | { |
| 772 | int idx, count; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 773 | struct snd_card *card; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 776 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | if ((card = snd_cards[idx]) != NULL) { |
| 778 | count++; |
| 779 | snd_iprintf(buffer, "%s\n", card->longname); |
| 780 | } |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 781 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | if (!count) { |
| 784 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | #endif |
| 789 | |
| 790 | #ifdef MODULE |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 791 | static struct snd_info_entry *snd_card_module_info_entry; |
| 792 | static void snd_card_module_info_read(struct snd_info_entry *entry, |
| 793 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | { |
| 795 | int idx; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 796 | struct snd_card *card; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | for (idx = 0; idx < SNDRV_CARDS; idx++) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 799 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | if ((card = snd_cards[idx]) != NULL) |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 801 | snd_iprintf(buffer, "%2i %s\n", |
| 802 | idx, card->module->name); |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 803 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
| 805 | } |
| 806 | #endif |
| 807 | |
| 808 | int __init snd_card_info_init(void) |
| 809 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 810 | struct snd_info_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); |
Takashi Iwai | 7c22f1a | 2005-10-10 11:46:31 +0200 | [diff] [blame] | 813 | if (! entry) |
| 814 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | entry->c.text.read = snd_card_info_read; |
| 816 | if (snd_info_register(entry) < 0) { |
| 817 | snd_info_free_entry(entry); |
| 818 | return -ENOMEM; |
| 819 | } |
| 820 | snd_card_info_entry = entry; |
| 821 | |
| 822 | #ifdef MODULE |
| 823 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); |
| 824 | if (entry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | entry->c.text.read = snd_card_module_info_read; |
| 826 | if (snd_info_register(entry) < 0) |
| 827 | snd_info_free_entry(entry); |
| 828 | else |
| 829 | snd_card_module_info_entry = entry; |
| 830 | } |
| 831 | #endif |
| 832 | |
| 833 | return 0; |
| 834 | } |
| 835 | |
| 836 | int __exit snd_card_info_done(void) |
| 837 | { |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 838 | snd_info_free_entry(snd_card_info_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | #ifdef MODULE |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 840 | snd_info_free_entry(snd_card_module_info_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | #endif |
| 842 | return 0; |
| 843 | } |
| 844 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 845 | #endif /* CONFIG_PROC_FS */ |
| 846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | /** |
| 848 | * snd_component_add - add a component string |
| 849 | * @card: soundcard structure |
| 850 | * @component: the component id string |
| 851 | * |
| 852 | * This function adds the component id string to the supported list. |
| 853 | * The component can be referred from the alsa-lib. |
| 854 | * |
| 855 | * Returns zero otherwise a negative error code. |
| 856 | */ |
| 857 | |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 858 | int snd_component_add(struct snd_card *card, const char *component) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
| 860 | char *ptr; |
| 861 | int len = strlen(component); |
| 862 | |
| 863 | ptr = strstr(card->components, component); |
| 864 | if (ptr != NULL) { |
| 865 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ |
| 866 | return 1; |
| 867 | } |
| 868 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { |
| 869 | snd_BUG(); |
| 870 | return -ENOMEM; |
| 871 | } |
| 872 | if (card->components[0] != '\0') |
| 873 | strcat(card->components, " "); |
| 874 | strcat(card->components, component); |
| 875 | return 0; |
| 876 | } |
| 877 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 878 | EXPORT_SYMBOL(snd_component_add); |
| 879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | /** |
| 881 | * snd_card_file_add - add the file to the file list of the card |
| 882 | * @card: soundcard structure |
| 883 | * @file: file pointer |
| 884 | * |
| 885 | * This function adds the file to the file linked-list of the card. |
| 886 | * This linked-list is used to keep tracking the connection state, |
| 887 | * and to avoid the release of busy resources by hotplug. |
| 888 | * |
| 889 | * Returns zero or a negative error code. |
| 890 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 891 | int snd_card_file_add(struct snd_card *card, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | { |
| 893 | struct snd_monitor_file *mfile; |
| 894 | |
| 895 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); |
| 896 | if (mfile == NULL) |
| 897 | return -ENOMEM; |
| 898 | mfile->file = file; |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 899 | mfile->disconnected_f_op = NULL; |
Takashi Iwai | a45e3d6 | 2011-03-24 09:50:15 +0100 | [diff] [blame] | 900 | INIT_LIST_HEAD(&mfile->shutdown_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | spin_lock(&card->files_lock); |
| 902 | if (card->shutdown) { |
| 903 | spin_unlock(&card->files_lock); |
| 904 | kfree(mfile); |
| 905 | return -ENODEV; |
| 906 | } |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 907 | list_add(&mfile->list, &card->files_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | spin_unlock(&card->files_lock); |
| 909 | return 0; |
| 910 | } |
| 911 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 912 | EXPORT_SYMBOL(snd_card_file_add); |
| 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | /** |
| 915 | * snd_card_file_remove - remove the file from the file list |
| 916 | * @card: soundcard structure |
| 917 | * @file: file pointer |
| 918 | * |
| 919 | * This function removes the file formerly added to the card via |
| 920 | * snd_card_file_add() function. |
Takashi Iwai | 2b29b13 | 2006-06-23 14:38:26 +0200 | [diff] [blame] | 921 | * If all files are removed and snd_card_free_when_closed() was |
| 922 | * called beforehand, it processes the pending release of |
| 923 | * resources. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | * |
| 925 | * Returns zero or a negative error code. |
| 926 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 927 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 929 | struct snd_monitor_file *mfile, *found = NULL; |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 930 | int last_close = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
| 932 | spin_lock(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 933 | list_for_each_entry(mfile, &card->files_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | if (mfile->file == file) { |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 935 | list_del(&mfile->list); |
Takashi Iwai | a45e3d6 | 2011-03-24 09:50:15 +0100 | [diff] [blame] | 936 | spin_lock(&shutdown_lock); |
| 937 | list_del(&mfile->shutdown_list); |
| 938 | spin_unlock(&shutdown_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 939 | if (mfile->disconnected_f_op) |
| 940 | fops_put(mfile->disconnected_f_op); |
| 941 | found = mfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | break; |
| 943 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 945 | if (list_empty(&card->files_list)) |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 946 | last_close = 1; |
| 947 | spin_unlock(&card->files_lock); |
| 948 | if (last_close) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | wake_up(&card->shutdown_sleep); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 950 | if (card->free_on_last_close) |
| 951 | snd_card_do_free(card); |
| 952 | } |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 953 | if (!found) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
| 955 | return -ENOENT; |
| 956 | } |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 957 | kfree(found); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | return 0; |
| 959 | } |
| 960 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 961 | EXPORT_SYMBOL(snd_card_file_remove); |
| 962 | |
Joonwoo Park | 6fb6439 | 2013-08-07 18:59:09 -0700 | [diff] [blame^] | 963 | /** |
| 964 | * snd_card_change_online_state - mark card's online/offline state |
| 965 | * @card: Card to mark |
| 966 | * @online: whether online of offline |
| 967 | * |
| 968 | * Mutes the DAI DAC. |
| 969 | */ |
| 970 | void snd_card_change_online_state(struct snd_card *card, int online) |
| 971 | { |
| 972 | snd_printd("snd card %s state change %d -> %d\n", |
| 973 | card->shortname, !card->offline, online); |
| 974 | card->offline = !online; |
| 975 | /* make sure offline is updated prior to wake up */ |
| 976 | wmb(); |
| 977 | xchg(&card->offline_change, 1); |
| 978 | wake_up_interruptible(&card->offline_poll_wait); |
| 979 | } |
| 980 | EXPORT_SYMBOL(snd_card_change_online_state); |
| 981 | |
| 982 | /** |
| 983 | * snd_card_is_online_state - return true if card is online state |
| 984 | * @card: Card to query |
| 985 | */ |
| 986 | bool snd_card_is_online_state(struct snd_card *card) |
| 987 | { |
| 988 | return !card->offline; |
| 989 | } |
| 990 | EXPORT_SYMBOL(snd_card_is_online_state); |
| 991 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | #ifdef CONFIG_PM |
| 993 | /** |
| 994 | * snd_power_wait - wait until the power-state is changed. |
| 995 | * @card: soundcard structure |
| 996 | * @power_state: expected power state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | * |
| 998 | * Waits until the power-state is changed. |
| 999 | * |
| 1000 | * Note: the power lock must be active before call. |
| 1001 | */ |
Takashi Iwai | cbac4b0 | 2006-03-27 12:38:07 +0200 | [diff] [blame] | 1002 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | { |
| 1004 | wait_queue_t wait; |
| 1005 | int result = 0; |
| 1006 | |
| 1007 | /* fastpath */ |
| 1008 | if (snd_power_get_state(card) == power_state) |
| 1009 | return 0; |
| 1010 | init_waitqueue_entry(&wait, current); |
| 1011 | add_wait_queue(&card->power_sleep, &wait); |
| 1012 | while (1) { |
| 1013 | if (card->shutdown) { |
| 1014 | result = -ENODEV; |
| 1015 | break; |
| 1016 | } |
| 1017 | if (snd_power_get_state(card) == power_state) |
| 1018 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 1020 | snd_power_unlock(card); |
| 1021 | schedule_timeout(30 * HZ); |
| 1022 | snd_power_lock(card); |
| 1023 | } |
| 1024 | remove_wait_queue(&card->power_sleep, &wait); |
| 1025 | return result; |
| 1026 | } |
| 1027 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 1028 | EXPORT_SYMBOL(snd_power_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | #endif /* CONFIG_PM */ |