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> |
Paul Gortmaker | 51990e8 | 2012-01-22 11:23:42 -0500 | [diff] [blame] | 25 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/file.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/time.h> |
| 29 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/pm.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <sound/core.h> |
| 33 | #include <sound/control.h> |
| 34 | #include <sound/info.h> |
| 35 | |
Takashi Iwai | 82a783f | 2009-09-07 15:50:18 +0200 | [diff] [blame] | 36 | /* monitor files for graceful shutdown (hotplug) */ |
| 37 | struct snd_monitor_file { |
| 38 | struct file *file; |
| 39 | const struct file_operations *disconnected_f_op; |
| 40 | struct list_head shutdown_list; /* still need to shutdown */ |
| 41 | struct list_head list; /* link of monitor files */ |
| 42 | }; |
| 43 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 44 | static DEFINE_SPINLOCK(shutdown_lock); |
| 45 | static LIST_HEAD(shutdown_files); |
| 46 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 47 | static const struct file_operations snd_shutdown_f_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Takashi Iwai | 7bb2491 | 2013-05-15 08:46:39 +0200 | [diff] [blame] | 49 | /* locked for registering/using */ |
| 50 | static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS); |
Takashi Iwai | 6581f4e | 2006-05-17 17:14:51 +0200 | [diff] [blame] | 51 | struct snd_card *snd_cards[SNDRV_CARDS]; |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 52 | EXPORT_SYMBOL(snd_cards); |
| 53 | |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 54 | static DEFINE_MUTEX(snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 56 | static char *slots[SNDRV_CARDS]; |
| 57 | module_param_array(slots, charp, NULL, 0444); |
| 58 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); |
| 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 | 60f6fef | 2013-10-28 12:54:52 +0100 | [diff] [blame] | 69 | if (!module || !*module->name || !slots[idx]) |
Takashi Iwai | 304cd07 | 2007-10-26 15:10:15 +0200 | [diff] [blame] | 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 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 109 | static inline int init_info_for_card(struct snd_card *card) |
| 110 | { |
| 111 | int err; |
| 112 | struct snd_info_entry *entry; |
| 113 | |
| 114 | if ((err = snd_info_card_register(card)) < 0) { |
| 115 | snd_printd("unable to create card info\n"); |
| 116 | return err; |
| 117 | } |
| 118 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { |
| 119 | snd_printd("unable to create card entry\n"); |
| 120 | return err; |
| 121 | } |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 122 | entry->c.text.read = snd_card_id_read; |
| 123 | if (snd_info_register(entry) < 0) { |
| 124 | snd_info_free_entry(entry); |
| 125 | entry = NULL; |
| 126 | } |
| 127 | card->proc_id = entry; |
| 128 | return 0; |
| 129 | } |
| 130 | #else /* !CONFIG_PROC_FS */ |
| 131 | #define init_info_for_card(card) |
| 132 | #endif |
| 133 | |
Takashi Iwai | deb6596 | 2014-01-23 11:02:15 +0100 | [diff] [blame] | 134 | static int check_empty_slot(struct module *module, int slot) |
| 135 | { |
| 136 | return !slots[slot] || !*slots[slot]; |
| 137 | } |
| 138 | |
| 139 | /* return an empty slot number (>= 0) found in the given bitmask @mask. |
| 140 | * @mask == -1 == 0xffffffff means: take any free slot up to 32 |
| 141 | * when no slot is available, return the original @mask as is. |
| 142 | */ |
| 143 | static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int), |
| 144 | struct module *module) |
| 145 | { |
| 146 | int slot; |
| 147 | |
| 148 | for (slot = 0; slot < SNDRV_CARDS; slot++) { |
| 149 | if (slot < 32 && !(mask & (1U << slot))) |
| 150 | continue; |
| 151 | if (!test_bit(slot, snd_cards_lock)) { |
| 152 | if (check(module, slot)) |
| 153 | return slot; /* found */ |
| 154 | } |
| 155 | } |
| 156 | return mask; /* unchanged */ |
| 157 | } |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | /** |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 160 | * snd_card_create - create and initialize a soundcard structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
| 162 | * @xid: card identification (ASCII string) |
| 163 | * @module: top level module for locking |
| 164 | * @extra_size: allocate this extra size after the main soundcard structure |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 165 | * @card_ret: the pointer to store the created card instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | * |
| 167 | * Creates and initializes a soundcard structure. |
| 168 | * |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 169 | * The function allocates snd_card instance via kzalloc with the given |
| 170 | * space for the driver to use freely. The allocated struct is stored |
| 171 | * in the given card_ret pointer. |
| 172 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 173 | * Return: Zero if successful or a negative error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | */ |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 175 | int snd_card_create(int idx, const char *xid, |
| 176 | struct module *module, int extra_size, |
| 177 | struct snd_card **card_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 179 | struct snd_card *card; |
Takashi Iwai | deb6596 | 2014-01-23 11:02:15 +0100 | [diff] [blame] | 180 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 182 | if (snd_BUG_ON(!card_ret)) |
| 183 | return -EINVAL; |
| 184 | *card_ret = NULL; |
| 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (extra_size < 0) |
| 187 | extra_size = 0; |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 188 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 189 | if (!card) |
| 190 | return -ENOMEM; |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 191 | if (xid) |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 192 | strlcpy(card->id, xid, sizeof(card->id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | err = 0; |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 194 | mutex_lock(&snd_card_mutex); |
Takashi Iwai | deb6596 | 2014-01-23 11:02:15 +0100 | [diff] [blame] | 195 | if (idx < 0) /* first check the matching module-name slot */ |
| 196 | idx = get_slot_from_bitmask(idx, module_slot_match, module); |
| 197 | if (idx < 0) /* if not matched, assign an empty slot */ |
| 198 | idx = get_slot_from_bitmask(idx, check_empty_slot, module); |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 199 | if (idx < 0) |
| 200 | err = -ENODEV; |
| 201 | else if (idx < snd_ecards_limit) { |
Takashi Iwai | 7bb2491 | 2013-05-15 08:46:39 +0200 | [diff] [blame] | 202 | if (test_bit(idx, snd_cards_lock)) |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 203 | err = -EBUSY; /* invalid */ |
| 204 | } else if (idx >= SNDRV_CARDS) |
| 205 | err = -ENODEV; |
| 206 | if (err < 0) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 207 | mutex_unlock(&snd_card_mutex); |
Oliver Neukum | 5c33dd7 | 2007-01-16 17:49:21 +0100 | [diff] [blame] | 208 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
| 209 | idx, snd_ecards_limit - 1, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | goto __error; |
| 211 | } |
Takashi Iwai | 7bb2491 | 2013-05-15 08:46:39 +0200 | [diff] [blame] | 212 | set_bit(idx, snd_cards_lock); /* lock it */ |
Takashi Iwai | a93bbaa | 2008-05-27 17:59:24 +0200 | [diff] [blame] | 213 | if (idx >= snd_ecards_limit) |
| 214 | snd_ecards_limit = idx + 1; /* increase the limit */ |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 215 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | card->number = idx; |
| 217 | card->module = module; |
| 218 | INIT_LIST_HEAD(&card->devices); |
| 219 | init_rwsem(&card->controls_rwsem); |
| 220 | rwlock_init(&card->ctl_files_rwlock); |
| 221 | INIT_LIST_HEAD(&card->controls); |
| 222 | INIT_LIST_HEAD(&card->ctl_files); |
| 223 | spin_lock_init(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 224 | INIT_LIST_HEAD(&card->files_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | init_waitqueue_head(&card->shutdown_sleep); |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 226 | atomic_set(&card->refcount, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | #ifdef CONFIG_PM |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 228 | mutex_init(&card->power_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | init_waitqueue_head(&card->power_sleep); |
| 230 | #endif |
| 231 | /* the control interface cannot be accessed from the user space until */ |
| 232 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 233 | err = snd_ctl_create(card); |
| 234 | if (err < 0) { |
| 235 | snd_printk(KERN_ERR "unable to register control minors\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | goto __error; |
| 237 | } |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 238 | err = snd_info_card_create(card); |
| 239 | if (err < 0) { |
| 240 | snd_printk(KERN_ERR "unable to create card info\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | goto __error_ctl; |
| 242 | } |
| 243 | if (extra_size > 0) |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 244 | card->private_data = (char *)card + sizeof(struct snd_card); |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 245 | *card_ret = card; |
| 246 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | __error_ctl: |
| 249 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); |
| 250 | __error: |
| 251 | kfree(card); |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 252 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
Takashi Iwai | 53fb1e6 | 2008-12-28 16:32:08 +0100 | [diff] [blame] | 254 | EXPORT_SYMBOL(snd_card_create); |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 255 | |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 256 | /* return non-zero if a card is already locked */ |
| 257 | int snd_card_locked(int card) |
| 258 | { |
| 259 | int locked; |
| 260 | |
| 261 | mutex_lock(&snd_card_mutex); |
Takashi Iwai | 7bb2491 | 2013-05-15 08:46:39 +0200 | [diff] [blame] | 262 | locked = test_bit(card, snd_cards_lock); |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 263 | mutex_unlock(&snd_card_mutex); |
| 264 | return locked; |
| 265 | } |
| 266 | |
Clemens Ladisch | b3b0abe | 2006-03-03 14:08:43 +0100 | [diff] [blame] | 267 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
| 268 | { |
| 269 | return -ENODEV; |
| 270 | } |
| 271 | |
| 272 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, |
| 273 | size_t count, loff_t *offset) |
| 274 | { |
| 275 | return -ENODEV; |
| 276 | } |
| 277 | |
| 278 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, |
| 279 | size_t count, loff_t *offset) |
| 280 | { |
| 281 | return -ENODEV; |
| 282 | } |
| 283 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 284 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
| 285 | { |
| 286 | struct snd_monitor_file *df = NULL, *_df; |
| 287 | |
| 288 | spin_lock(&shutdown_lock); |
| 289 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { |
| 290 | if (_df->file == file) { |
| 291 | df = _df; |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 292 | list_del_init(&df->shutdown_list); |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 293 | break; |
| 294 | } |
| 295 | } |
| 296 | spin_unlock(&shutdown_lock); |
| 297 | |
Al Viro | 233e70f | 2008-10-31 23:28:30 +0000 | [diff] [blame] | 298 | if (likely(df)) { |
| 299 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) |
| 300 | df->disconnected_f_op->fasync(-1, file, 0); |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 301 | return df->disconnected_f_op->release(inode, file); |
Al Viro | 233e70f | 2008-10-31 23:28:30 +0000 | [diff] [blame] | 302 | } |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 303 | |
Harvey Harrison | 9bf8e7d | 2008-03-03 15:32:18 -0800 | [diff] [blame] | 304 | panic("%s(%p, %p) failed!", __func__, inode, file); |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 305 | } |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
| 308 | { |
| 309 | return POLLERR | POLLNVAL; |
| 310 | } |
| 311 | |
Clemens Ladisch | b3b0abe | 2006-03-03 14:08:43 +0100 | [diff] [blame] | 312 | static long snd_disconnect_ioctl(struct file *file, |
| 313 | unsigned int cmd, unsigned long arg) |
| 314 | { |
| 315 | return -ENODEV; |
| 316 | } |
| 317 | |
| 318 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) |
| 319 | { |
| 320 | return -ENODEV; |
| 321 | } |
| 322 | |
| 323 | static int snd_disconnect_fasync(int fd, struct file *file, int on) |
| 324 | { |
| 325 | return -ENODEV; |
| 326 | } |
| 327 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 328 | static const struct file_operations snd_shutdown_f_ops = |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 329 | { |
| 330 | .owner = THIS_MODULE, |
| 331 | .llseek = snd_disconnect_llseek, |
| 332 | .read = snd_disconnect_read, |
| 333 | .write = snd_disconnect_write, |
| 334 | .release = snd_disconnect_release, |
| 335 | .poll = snd_disconnect_poll, |
| 336 | .unlocked_ioctl = snd_disconnect_ioctl, |
| 337 | #ifdef CONFIG_COMPAT |
| 338 | .compat_ioctl = snd_disconnect_ioctl, |
| 339 | #endif |
| 340 | .mmap = snd_disconnect_mmap, |
| 341 | .fasync = snd_disconnect_fasync |
| 342 | }; |
| 343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | /** |
| 345 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) |
| 346 | * @card: soundcard structure |
| 347 | * |
| 348 | * Disconnects all APIs from the file-operations (user space). |
| 349 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 350 | * Return: Zero, otherwise a negative error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | * |
| 352 | * Note: The current implementation replaces all active file->f_op with special |
| 353 | * dummy file operations (they do nothing except release). |
| 354 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 355 | int snd_card_disconnect(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | { |
| 357 | struct snd_monitor_file *mfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | int err; |
| 359 | |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 360 | if (!card) |
| 361 | return -EINVAL; |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | spin_lock(&card->files_lock); |
| 364 | if (card->shutdown) { |
| 365 | spin_unlock(&card->files_lock); |
| 366 | return 0; |
| 367 | } |
| 368 | card->shutdown = 1; |
| 369 | spin_unlock(&card->files_lock); |
| 370 | |
| 371 | /* phase 1: disable fops (user space) operations for ALSA API */ |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 372 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | snd_cards[card->number] = NULL; |
Takashi Iwai | 7bb2491 | 2013-05-15 08:46:39 +0200 | [diff] [blame] | 374 | clear_bit(card->number, snd_cards_lock); |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 375 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | /* phase 2: replace file->f_op with special dummy operations */ |
| 378 | |
| 379 | spin_lock(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 380 | list_for_each_entry(mfile, &card->files_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /* it's critical part, use endless loop */ |
| 382 | /* we have no room to fail */ |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 383 | mfile->disconnected_f_op = mfile->file->f_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 385 | spin_lock(&shutdown_lock); |
| 386 | list_add(&mfile->shutdown_list, &shutdown_files); |
| 387 | spin_unlock(&shutdown_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 389 | mfile->file->f_op = &snd_shutdown_f_ops; |
Miguel Boton | bc9abce | 2008-01-13 12:03:53 +0100 | [diff] [blame] | 390 | fops_get(mfile->file->f_op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | spin_unlock(&card->files_lock); |
| 393 | |
| 394 | /* phase 3: notify all connected devices about disconnection */ |
| 395 | /* at this point, they cannot respond to any calls except release() */ |
| 396 | |
| 397 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 398 | if (snd_mixer_oss_notify_callback) |
| 399 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); |
| 400 | #endif |
| 401 | |
| 402 | /* notify all devices that we are disconnected */ |
| 403 | err = snd_device_disconnect_all(card); |
| 404 | if (err < 0) |
| 405 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); |
| 406 | |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 407 | snd_info_card_disconnect(card); |
Takashi Iwai | 73d38b1 | 2008-04-17 12:50:47 +0200 | [diff] [blame] | 408 | if (card->card_dev) { |
| 409 | device_unregister(card->card_dev); |
| 410 | card->card_dev = NULL; |
| 411 | } |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 412 | #ifdef CONFIG_PM |
| 413 | wake_up(&card->power_sleep); |
| 414 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | return 0; |
| 416 | } |
| 417 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 418 | EXPORT_SYMBOL(snd_card_disconnect); |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | /** |
| 421 | * snd_card_free - frees given soundcard structure |
| 422 | * @card: soundcard structure |
| 423 | * |
| 424 | * This function releases the soundcard structure and the all assigned |
| 425 | * devices automatically. That is, you don't have to release the devices |
| 426 | * by yourself. |
| 427 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 428 | * Return: Zero. Frees all associated devices and frees the control |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | * interface associated to given soundcard. |
| 430 | */ |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 431 | static int snd_card_do_free(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 434 | if (snd_mixer_oss_notify_callback) |
| 435 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); |
| 436 | #endif |
| 437 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { |
| 438 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); |
| 439 | /* Fatal, but this situation should never occur */ |
| 440 | } |
| 441 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { |
| 442 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); |
| 443 | /* Fatal, but this situation should never occur */ |
| 444 | } |
| 445 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { |
| 446 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); |
| 447 | /* Fatal, but this situation should never occur */ |
| 448 | } |
| 449 | if (card->private_free) |
| 450 | card->private_free(card); |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 451 | snd_info_free_entry(card->proc_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | if (snd_info_card_free(card) < 0) { |
| 453 | snd_printk(KERN_WARNING "unable to free card info\n"); |
| 454 | /* Not fatal error */ |
| 455 | } |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 456 | kfree(card); |
| 457 | return 0; |
| 458 | } |
| 459 | |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 460 | /** |
| 461 | * snd_card_unref - release the reference counter |
| 462 | * @card: the card instance |
| 463 | * |
| 464 | * Decrements the reference counter. When it reaches to zero, wake up |
| 465 | * the sleeper and call the destructor if needed. |
| 466 | */ |
| 467 | void snd_card_unref(struct snd_card *card) |
| 468 | { |
| 469 | if (atomic_dec_and_test(&card->refcount)) { |
| 470 | wake_up(&card->shutdown_sleep); |
| 471 | if (card->free_on_last_close) |
| 472 | snd_card_do_free(card); |
| 473 | } |
| 474 | } |
| 475 | EXPORT_SYMBOL(snd_card_unref); |
| 476 | |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 477 | int snd_card_free_when_closed(struct snd_card *card) |
| 478 | { |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 479 | int ret; |
| 480 | |
| 481 | atomic_inc(&card->refcount); |
| 482 | ret = snd_card_disconnect(card); |
| 483 | if (ret) { |
| 484 | atomic_dec(&card->refcount); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 485 | return ret; |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 486 | } |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 487 | |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 488 | card->free_on_last_close = 1; |
| 489 | if (atomic_dec_and_test(&card->refcount)) |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 490 | snd_card_do_free(card); |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | EXPORT_SYMBOL(snd_card_free_when_closed); |
| 495 | |
| 496 | int snd_card_free(struct snd_card *card) |
| 497 | { |
Takashi Iwai | f18638d | 2008-04-17 12:52:02 +0200 | [diff] [blame] | 498 | int ret = snd_card_disconnect(card); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 499 | if (ret) |
| 500 | return ret; |
| 501 | |
| 502 | /* wait, until all devices are ready for the free operation */ |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 503 | wait_event(card->shutdown_sleep, !atomic_read(&card->refcount)); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 504 | snd_card_do_free(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | return 0; |
| 506 | } |
| 507 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 508 | EXPORT_SYMBOL(snd_card_free); |
| 509 | |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 510 | /* retrieve the last word of shortname or longname */ |
| 511 | static const char *retrieve_id_from_card_name(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 513 | const char *spos = name; |
| 514 | |
| 515 | while (*name) { |
| 516 | if (isspace(*name) && isalnum(name[1])) |
| 517 | spos = name + 1; |
| 518 | name++; |
| 519 | } |
| 520 | return spos; |
| 521 | } |
| 522 | |
| 523 | /* return true if the given id string doesn't conflict any other card ids */ |
| 524 | static bool card_id_ok(struct snd_card *card, const char *id) |
| 525 | { |
| 526 | int i; |
| 527 | if (!snd_info_check_reserved_words(id)) |
| 528 | return false; |
| 529 | for (i = 0; i < snd_ecards_limit; i++) { |
| 530 | if (snd_cards[i] && snd_cards[i] != card && |
| 531 | !strcmp(snd_cards[i]->id, id)) |
| 532 | return false; |
| 533 | } |
| 534 | return true; |
| 535 | } |
| 536 | |
| 537 | /* copy to card->id only with valid letters from nid */ |
| 538 | static void copy_valid_id_string(struct snd_card *card, const char *src, |
| 539 | const char *nid) |
| 540 | { |
| 541 | char *id = card->id; |
| 542 | |
| 543 | while (*nid && !isalnum(*nid)) |
| 544 | nid++; |
| 545 | if (isdigit(*nid)) |
| 546 | *id++ = isalpha(*src) ? *src : 'D'; |
| 547 | while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
| 548 | if (isalnum(*nid)) |
| 549 | *id++ = *nid; |
| 550 | nid++; |
| 551 | } |
| 552 | *id = 0; |
| 553 | } |
| 554 | |
| 555 | /* Set card->id from the given string |
| 556 | * If the string conflicts with other ids, add a suffix to make it unique. |
| 557 | */ |
| 558 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *src, |
| 559 | const char *nid) |
| 560 | { |
| 561 | int len, loops; |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 562 | bool is_default = false; |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 563 | char *id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 565 | copy_valid_id_string(card, src, nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | id = card->id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 568 | again: |
| 569 | /* use "Default" for obviously invalid strings |
| 570 | * ("card" conflicts with proc directories) |
| 571 | */ |
| 572 | if (!*id || !strncmp(id, "card", 4)) { |
Takashi Iwai | d8e4f9a | 2011-04-04 12:43:23 +0200 | [diff] [blame] | 573 | strcpy(id, "Default"); |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 574 | is_default = true; |
| 575 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
Takashi Iwai | 8edbb19 | 2013-05-24 16:30:39 +0200 | [diff] [blame] | 577 | len = strlen(id); |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 578 | for (loops = 0; loops < SNDRV_CARDS; loops++) { |
Takashi Iwai | 8edbb19 | 2013-05-24 16:30:39 +0200 | [diff] [blame] | 579 | char *spos; |
| 580 | char sfxstr[5]; /* "_012" */ |
| 581 | int sfxlen; |
| 582 | |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 583 | if (card_id_ok(card, id)) |
| 584 | return; /* OK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
Takashi Iwai | 8edbb19 | 2013-05-24 16:30:39 +0200 | [diff] [blame] | 586 | /* Add _XYZ suffix */ |
| 587 | sprintf(sfxstr, "_%X", loops + 1); |
| 588 | sfxlen = strlen(sfxstr); |
| 589 | if (len + sfxlen >= sizeof(card->id)) |
| 590 | spos = id + sizeof(card->id) - sfxlen - 1; |
| 591 | else |
| 592 | spos = id + len; |
| 593 | strcpy(spos, sfxstr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 595 | /* fallback to the default id */ |
| 596 | if (!is_default) { |
| 597 | *id = 0; |
| 598 | goto again; |
| 599 | } |
| 600 | /* last resort... */ |
| 601 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); |
| 602 | if (card->proc_root->name) |
Takashi Iwai | 97f44f5 | 2013-10-29 15:20:06 +0100 | [diff] [blame] | 603 | strlcpy(card->id, card->proc_root->name, sizeof(card->id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Mark Brown | 872c782 | 2009-06-03 20:43:29 +0100 | [diff] [blame] | 606 | /** |
| 607 | * snd_card_set_id - set card identification name |
| 608 | * @card: soundcard structure |
| 609 | * @nid: new identification string |
| 610 | * |
| 611 | * This function sets the card identification and checks for name |
| 612 | * collisions. |
| 613 | */ |
| 614 | void snd_card_set_id(struct snd_card *card, const char *nid) |
| 615 | { |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 616 | /* check if user specified own card->id */ |
| 617 | if (card->id[0] != '\0') |
| 618 | return; |
| 619 | mutex_lock(&snd_card_mutex); |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 620 | snd_card_set_id_no_lock(card, nid, nid); |
Jaroslav Kysela | 5fdc18d | 2009-06-04 00:12:18 +0200 | [diff] [blame] | 621 | mutex_unlock(&snd_card_mutex); |
Mark Brown | 872c782 | 2009-06-03 20:43:29 +0100 | [diff] [blame] | 622 | } |
Jaroslav Kysela | 10a8ebb | 2009-06-02 12:02:38 +0200 | [diff] [blame] | 623 | EXPORT_SYMBOL(snd_card_set_id); |
| 624 | |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 625 | static ssize_t |
| 626 | card_id_show_attr(struct device *dev, |
| 627 | struct device_attribute *attr, char *buf) |
| 628 | { |
| 629 | struct snd_card *card = dev_get_drvdata(dev); |
| 630 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); |
| 631 | } |
| 632 | |
| 633 | static ssize_t |
| 634 | card_id_store_attr(struct device *dev, struct device_attribute *attr, |
| 635 | const char *buf, size_t count) |
| 636 | { |
| 637 | struct snd_card *card = dev_get_drvdata(dev); |
| 638 | char buf1[sizeof(card->id)]; |
| 639 | size_t copy = count > sizeof(card->id) - 1 ? |
| 640 | sizeof(card->id) - 1 : count; |
| 641 | size_t idx; |
| 642 | int c; |
| 643 | |
| 644 | for (idx = 0; idx < copy; idx++) { |
| 645 | c = buf[idx]; |
| 646 | if (!isalnum(c) && c != '_' && c != '-') |
| 647 | return -EINVAL; |
| 648 | } |
| 649 | memcpy(buf1, buf, copy); |
| 650 | buf1[copy] = '\0'; |
| 651 | mutex_lock(&snd_card_mutex); |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 652 | if (!card_id_ok(NULL, buf1)) { |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 653 | mutex_unlock(&snd_card_mutex); |
| 654 | return -EEXIST; |
| 655 | } |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 656 | strcpy(card->id, buf1); |
Jaroslav Kysela | c2eb9c4 | 2008-11-12 16:31:37 +0100 | [diff] [blame] | 657 | snd_info_card_id_change(card); |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 658 | mutex_unlock(&snd_card_mutex); |
| 659 | |
| 660 | return count; |
| 661 | } |
| 662 | |
| 663 | static struct device_attribute card_id_attrs = |
| 664 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); |
| 665 | |
| 666 | static ssize_t |
| 667 | card_number_show_attr(struct device *dev, |
| 668 | struct device_attribute *attr, char *buf) |
| 669 | { |
| 670 | struct snd_card *card = dev_get_drvdata(dev); |
| 671 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); |
| 672 | } |
| 673 | |
| 674 | static struct device_attribute card_number_attrs = |
| 675 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | /** |
| 678 | * snd_card_register - register the soundcard |
| 679 | * @card: soundcard structure |
| 680 | * |
| 681 | * This function registers all the devices assigned to the soundcard. |
| 682 | * Until calling this, the ALSA control interface is blocked from the |
| 683 | * external accesses. Thus, you should call this function at the end |
| 684 | * of the initialization of the card. |
| 685 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 686 | * Return: Zero otherwise a negative error code if the registration failed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 688 | int snd_card_register(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
| 690 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 692 | if (snd_BUG_ON(!card)) |
| 693 | return -EINVAL; |
Kay Sievers | 39aba96 | 2010-09-04 22:33:14 -0700 | [diff] [blame] | 694 | |
Takashi Iwai | 7d2aae1 | 2007-01-26 12:40:31 +0100 | [diff] [blame] | 695 | if (!card->card_dev) { |
Greg Kroah-Hartman | abe9ab8 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 696 | card->card_dev = device_create(sound_class, card->dev, |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 697 | MKDEV(0, 0), card, |
Greg Kroah-Hartman | abe9ab8 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 698 | "card%i", card->number); |
Takashi Iwai | 7d2aae1 | 2007-01-26 12:40:31 +0100 | [diff] [blame] | 699 | if (IS_ERR(card->card_dev)) |
| 700 | card->card_dev = NULL; |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 701 | } |
Kay Sievers | 39aba96 | 2010-09-04 22:33:14 -0700 | [diff] [blame] | 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | if ((err = snd_device_register_all(card)) < 0) |
| 704 | return err; |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 705 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | if (snd_cards[card->number]) { |
| 707 | /* already registered */ |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 708 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | return 0; |
| 710 | } |
Takashi Iwai | e7df2a3 | 2012-03-09 17:41:53 +0100 | [diff] [blame] | 711 | if (*card->id) { |
| 712 | /* make a unique id name from the given string */ |
| 713 | char tmpid[sizeof(card->id)]; |
| 714 | memcpy(tmpid, card->id, sizeof(card->id)); |
| 715 | snd_card_set_id_no_lock(card, tmpid, tmpid); |
| 716 | } else { |
| 717 | /* create an id from either shortname or longname */ |
| 718 | const char *src; |
| 719 | src = *card->shortname ? card->shortname : card->longname; |
| 720 | snd_card_set_id_no_lock(card, src, |
| 721 | retrieve_id_from_card_name(src)); |
| 722 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | snd_cards[card->number] = card; |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 724 | mutex_unlock(&snd_card_mutex); |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 725 | init_info_for_card(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 727 | if (snd_mixer_oss_notify_callback) |
| 728 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); |
| 729 | #endif |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 730 | if (card->card_dev) { |
Hannes Eder | 2af7529 | 2008-11-18 12:25:06 -0500 | [diff] [blame] | 731 | err = device_create_file(card->card_dev, &card_id_attrs); |
| 732 | if (err < 0) |
| 733 | return err; |
| 734 | err = device_create_file(card->card_dev, &card_number_attrs); |
| 735 | if (err < 0) |
| 736 | return err; |
Jaroslav Kysela | 9fb6198 | 2008-11-11 16:51:02 +0100 | [diff] [blame] | 737 | } |
Kay Sievers | 39aba96 | 2010-09-04 22:33:14 -0700 | [diff] [blame] | 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | return 0; |
| 740 | } |
| 741 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 742 | EXPORT_SYMBOL(snd_card_register); |
| 743 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 744 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | 6581f4e | 2006-05-17 17:14:51 +0200 | [diff] [blame] | 745 | static struct snd_info_entry *snd_card_info_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Takashi Iwai | a381a7a | 2005-11-17 15:55:49 +0100 | [diff] [blame] | 747 | static void snd_card_info_read(struct snd_info_entry *entry, |
| 748 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | { |
| 750 | int idx, count; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 751 | struct snd_card *card; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | |
| 753 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 754 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | if ((card = snd_cards[idx]) != NULL) { |
| 756 | count++; |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 757 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | idx, |
| 759 | card->id, |
| 760 | card->driver, |
| 761 | card->shortname); |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 762 | snd_iprintf(buffer, " %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | card->longname); |
| 764 | } |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 765 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
| 767 | if (!count) |
| 768 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
| 769 | } |
| 770 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 771 | #ifdef CONFIG_SND_OSSEMUL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 773 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
| 775 | int idx, count; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 776 | struct snd_card *card; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
| 778 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 779 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | if ((card = snd_cards[idx]) != NULL) { |
| 781 | count++; |
| 782 | snd_iprintf(buffer, "%s\n", card->longname); |
| 783 | } |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 784 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | if (!count) { |
| 787 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | #endif |
| 792 | |
| 793 | #ifdef MODULE |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 794 | static struct snd_info_entry *snd_card_module_info_entry; |
| 795 | static void snd_card_module_info_read(struct snd_info_entry *entry, |
| 796 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
| 798 | int idx; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 799 | struct snd_card *card; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
| 801 | for (idx = 0; idx < SNDRV_CARDS; idx++) { |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 802 | mutex_lock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | if ((card = snd_cards[idx]) != NULL) |
Clemens Ladisch | d001544 | 2005-11-20 14:09:05 +0100 | [diff] [blame] | 804 | snd_iprintf(buffer, "%2i %s\n", |
| 805 | idx, card->module->name); |
Takashi Iwai | 746df94 | 2006-05-15 19:49:05 +0200 | [diff] [blame] | 806 | mutex_unlock(&snd_card_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | } |
| 809 | #endif |
| 810 | |
| 811 | int __init snd_card_info_init(void) |
| 812 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 813 | struct snd_info_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); |
Takashi Iwai | 7c22f1a | 2005-10-10 11:46:31 +0200 | [diff] [blame] | 816 | if (! entry) |
| 817 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | entry->c.text.read = snd_card_info_read; |
| 819 | if (snd_info_register(entry) < 0) { |
| 820 | snd_info_free_entry(entry); |
| 821 | return -ENOMEM; |
| 822 | } |
| 823 | snd_card_info_entry = entry; |
| 824 | |
| 825 | #ifdef MODULE |
| 826 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); |
| 827 | if (entry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | entry->c.text.read = snd_card_module_info_read; |
| 829 | if (snd_info_register(entry) < 0) |
| 830 | snd_info_free_entry(entry); |
| 831 | else |
| 832 | snd_card_module_info_entry = entry; |
| 833 | } |
| 834 | #endif |
| 835 | |
| 836 | return 0; |
| 837 | } |
| 838 | |
| 839 | int __exit snd_card_info_done(void) |
| 840 | { |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 841 | snd_info_free_entry(snd_card_info_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | #ifdef MODULE |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 843 | snd_info_free_entry(snd_card_module_info_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | #endif |
| 845 | return 0; |
| 846 | } |
| 847 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 848 | #endif /* CONFIG_PROC_FS */ |
| 849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | /** |
| 851 | * snd_component_add - add a component string |
| 852 | * @card: soundcard structure |
| 853 | * @component: the component id string |
| 854 | * |
| 855 | * This function adds the component id string to the supported list. |
| 856 | * The component can be referred from the alsa-lib. |
| 857 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 858 | * Return: Zero otherwise a negative error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | */ |
| 860 | |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 861 | int snd_component_add(struct snd_card *card, const char *component) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
| 863 | char *ptr; |
| 864 | int len = strlen(component); |
| 865 | |
| 866 | ptr = strstr(card->components, component); |
| 867 | if (ptr != NULL) { |
| 868 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ |
| 869 | return 1; |
| 870 | } |
| 871 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { |
| 872 | snd_BUG(); |
| 873 | return -ENOMEM; |
| 874 | } |
| 875 | if (card->components[0] != '\0') |
| 876 | strcat(card->components, " "); |
| 877 | strcat(card->components, component); |
| 878 | return 0; |
| 879 | } |
| 880 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 881 | EXPORT_SYMBOL(snd_component_add); |
| 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | /** |
| 884 | * snd_card_file_add - add the file to the file list of the card |
| 885 | * @card: soundcard structure |
| 886 | * @file: file pointer |
| 887 | * |
| 888 | * This function adds the file to the file linked-list of the card. |
| 889 | * This linked-list is used to keep tracking the connection state, |
| 890 | * and to avoid the release of busy resources by hotplug. |
| 891 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 892 | * Return: zero or a negative error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 894 | int snd_card_file_add(struct snd_card *card, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | { |
| 896 | struct snd_monitor_file *mfile; |
| 897 | |
| 898 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); |
| 899 | if (mfile == NULL) |
| 900 | return -ENOMEM; |
| 901 | mfile->file = file; |
Karsten Wiese | a9edfc6 | 2006-10-06 16:08:27 +0200 | [diff] [blame] | 902 | mfile->disconnected_f_op = NULL; |
Takashi Iwai | a45e3d6 | 2011-03-24 09:50:15 +0100 | [diff] [blame] | 903 | INIT_LIST_HEAD(&mfile->shutdown_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | spin_lock(&card->files_lock); |
| 905 | if (card->shutdown) { |
| 906 | spin_unlock(&card->files_lock); |
| 907 | kfree(mfile); |
| 908 | return -ENODEV; |
| 909 | } |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 910 | list_add(&mfile->list, &card->files_list); |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 911 | atomic_inc(&card->refcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | spin_unlock(&card->files_lock); |
| 913 | return 0; |
| 914 | } |
| 915 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 916 | EXPORT_SYMBOL(snd_card_file_add); |
| 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | /** |
| 919 | * snd_card_file_remove - remove the file from the file list |
| 920 | * @card: soundcard structure |
| 921 | * @file: file pointer |
| 922 | * |
| 923 | * This function removes the file formerly added to the card via |
| 924 | * snd_card_file_add() function. |
Takashi Iwai | 2b29b13 | 2006-06-23 14:38:26 +0200 | [diff] [blame] | 925 | * If all files are removed and snd_card_free_when_closed() was |
| 926 | * called beforehand, it processes the pending release of |
| 927 | * resources. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 929 | * Return: Zero or a negative error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 931 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | { |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 933 | struct snd_monitor_file *mfile, *found = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | spin_lock(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 936 | list_for_each_entry(mfile, &card->files_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | if (mfile->file == file) { |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 938 | list_del(&mfile->list); |
Takashi Iwai | a45e3d6 | 2011-03-24 09:50:15 +0100 | [diff] [blame] | 939 | spin_lock(&shutdown_lock); |
| 940 | list_del(&mfile->shutdown_list); |
| 941 | spin_unlock(&shutdown_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 942 | if (mfile->disconnected_f_op) |
| 943 | fops_put(mfile->disconnected_f_op); |
| 944 | found = mfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | break; |
| 946 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 948 | spin_unlock(&card->files_lock); |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 949 | if (!found) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
| 951 | return -ENOENT; |
| 952 | } |
Takashi Iwai | 118dd6b | 2009-02-23 16:35:21 +0100 | [diff] [blame] | 953 | kfree(found); |
Takashi Iwai | a0830db | 2012-10-16 13:05:59 +0200 | [diff] [blame] | 954 | snd_card_unref(card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | return 0; |
| 956 | } |
| 957 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 958 | EXPORT_SYMBOL(snd_card_file_remove); |
| 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | #ifdef CONFIG_PM |
| 961 | /** |
| 962 | * snd_power_wait - wait until the power-state is changed. |
| 963 | * @card: soundcard structure |
| 964 | * @power_state: expected power state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | * |
| 966 | * Waits until the power-state is changed. |
| 967 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 968 | * Return: Zero if successful, or a negative error code. |
| 969 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | * Note: the power lock must be active before call. |
| 971 | */ |
Takashi Iwai | cbac4b0 | 2006-03-27 12:38:07 +0200 | [diff] [blame] | 972 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | { |
| 974 | wait_queue_t wait; |
| 975 | int result = 0; |
| 976 | |
| 977 | /* fastpath */ |
| 978 | if (snd_power_get_state(card) == power_state) |
| 979 | return 0; |
| 980 | init_waitqueue_entry(&wait, current); |
| 981 | add_wait_queue(&card->power_sleep, &wait); |
| 982 | while (1) { |
| 983 | if (card->shutdown) { |
| 984 | result = -ENODEV; |
| 985 | break; |
| 986 | } |
| 987 | if (snd_power_get_state(card) == power_state) |
| 988 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 990 | snd_power_unlock(card); |
| 991 | schedule_timeout(30 * HZ); |
| 992 | snd_power_lock(card); |
| 993 | } |
| 994 | remove_wait_queue(&card->power_sleep, &wait); |
| 995 | return result; |
| 996 | } |
| 997 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 998 | EXPORT_SYMBOL(snd_power_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | #endif /* CONFIG_PM */ |