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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Initialization routines | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/sched.h> | |
da155d5b | 24 | #include <linux/module.h> |
51990e82 | 25 | #include <linux/device.h> |
1da177e4 LT |
26 | #include <linux/file.h> |
27 | #include <linux/slab.h> | |
28 | #include <linux/time.h> | |
29 | #include <linux/ctype.h> | |
1da177e4 | 30 | #include <linux/pm.h> |
d052d1be | 31 | |
1da177e4 LT |
32 | #include <sound/core.h> |
33 | #include <sound/control.h> | |
34 | #include <sound/info.h> | |
35 | ||
82a783f4 TI |
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 | ||
a9edfc60 KW |
44 | static DEFINE_SPINLOCK(shutdown_lock); |
45 | static LIST_HEAD(shutdown_files); | |
46 | ||
9c2e08c5 | 47 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 48 | |
6581f4e7 TI |
49 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
50 | struct snd_card *snd_cards[SNDRV_CARDS]; | |
c0d3fb39 TI |
51 | EXPORT_SYMBOL(snd_cards); |
52 | ||
746df948 | 53 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 | 54 | |
304cd07f TI |
55 | static char *slots[SNDRV_CARDS]; |
56 | module_param_array(slots, charp, NULL, 0444); | |
57 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); | |
58 | ||
a93bbaa7 | 59 | /* return non-zero if the given index is reserved for the given |
304cd07f TI |
60 | * module via slots option |
61 | */ | |
a93bbaa7 | 62 | static int module_slot_match(struct module *module, int idx) |
304cd07f | 63 | { |
a93bbaa7 | 64 | int match = 1; |
304cd07f | 65 | #ifdef MODULE |
a93bbaa7 TI |
66 | const char *s1, *s2; |
67 | ||
304cd07f TI |
68 | if (!module || !module->name || !slots[idx]) |
69 | return 0; | |
a93bbaa7 TI |
70 | |
71 | s1 = module->name; | |
72 | s2 = slots[idx]; | |
73 | if (*s2 == '!') { | |
74 | match = 0; /* negative match */ | |
75 | s2++; | |
76 | } | |
304cd07f TI |
77 | /* compare module name strings |
78 | * hyphens are handled as equivalent with underscore | |
79 | */ | |
80 | for (;;) { | |
81 | char c1 = *s1++; | |
82 | char c2 = *s2++; | |
83 | if (c1 == '-') | |
84 | c1 = '_'; | |
85 | if (c2 == '-') | |
86 | c2 = '_'; | |
87 | if (c1 != c2) | |
a93bbaa7 | 88 | return !match; |
304cd07f TI |
89 | if (!c1) |
90 | break; | |
91 | } | |
a93bbaa7 TI |
92 | #endif /* MODULE */ |
93 | return match; | |
304cd07f TI |
94 | } |
95 | ||
1da177e4 | 96 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
512bbd6a | 97 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 98 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
99 | #endif |
100 | ||
e28563cc | 101 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
102 | static void snd_card_id_read(struct snd_info_entry *entry, |
103 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
104 | { |
105 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
106 | } | |
107 | ||
e28563cc TI |
108 | static inline int init_info_for_card(struct snd_card *card) |
109 | { | |
110 | int err; | |
111 | struct snd_info_entry *entry; | |
112 | ||
113 | if ((err = snd_info_card_register(card)) < 0) { | |
114 | snd_printd("unable to create card info\n"); | |
115 | return err; | |
116 | } | |
117 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
118 | snd_printd("unable to create card entry\n"); | |
119 | return err; | |
120 | } | |
e28563cc TI |
121 | entry->c.text.read = snd_card_id_read; |
122 | if (snd_info_register(entry) < 0) { | |
123 | snd_info_free_entry(entry); | |
124 | entry = NULL; | |
125 | } | |
126 | card->proc_id = entry; | |
127 | return 0; | |
128 | } | |
129 | #else /* !CONFIG_PROC_FS */ | |
130 | #define init_info_for_card(card) | |
131 | #endif | |
132 | ||
1da177e4 | 133 | /** |
53fb1e63 | 134 | * snd_card_create - create and initialize a soundcard structure |
1da177e4 LT |
135 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
136 | * @xid: card identification (ASCII string) | |
137 | * @module: top level module for locking | |
138 | * @extra_size: allocate this extra size after the main soundcard structure | |
53fb1e63 | 139 | * @card_ret: the pointer to store the created card instance |
1da177e4 LT |
140 | * |
141 | * Creates and initializes a soundcard structure. | |
142 | * | |
53fb1e63 TI |
143 | * The function allocates snd_card instance via kzalloc with the given |
144 | * space for the driver to use freely. The allocated struct is stored | |
145 | * in the given card_ret pointer. | |
146 | * | |
147 | * Returns zero if successful or a negative error code. | |
1da177e4 | 148 | */ |
53fb1e63 TI |
149 | int snd_card_create(int idx, const char *xid, |
150 | struct module *module, int extra_size, | |
151 | struct snd_card **card_ret) | |
1da177e4 | 152 | { |
512bbd6a | 153 | struct snd_card *card; |
a93bbaa7 | 154 | int err, idx2; |
1da177e4 | 155 | |
53fb1e63 TI |
156 | if (snd_BUG_ON(!card_ret)) |
157 | return -EINVAL; | |
158 | *card_ret = NULL; | |
159 | ||
1da177e4 LT |
160 | if (extra_size < 0) |
161 | extra_size = 0; | |
ca2c0966 | 162 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
163 | if (!card) |
164 | return -ENOMEM; | |
10a8ebbb | 165 | if (xid) |
5fdc18d9 | 166 | strlcpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 167 | err = 0; |
746df948 | 168 | mutex_lock(&snd_card_mutex); |
1da177e4 | 169 | if (idx < 0) { |
1da177e4 | 170 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
5c33dd70 | 171 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 172 | if (~snd_cards_lock & idx & 1<<idx2) { |
a93bbaa7 TI |
173 | if (module_slot_match(module, idx2)) { |
174 | idx = idx2; | |
175 | break; | |
176 | } | |
177 | } | |
178 | } | |
179 | if (idx < 0) { | |
180 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
181 | /* idx == -1 == 0xffff means: take any free slot */ | |
182 | if (~snd_cards_lock & idx & 1<<idx2) { | |
183 | if (!slots[idx2] || !*slots[idx2]) { | |
184 | idx = idx2; | |
185 | break; | |
186 | } | |
1da177e4 | 187 | } |
5c33dd70 | 188 | } |
a93bbaa7 TI |
189 | if (idx < 0) |
190 | err = -ENODEV; | |
191 | else if (idx < snd_ecards_limit) { | |
192 | if (snd_cards_lock & (1 << idx)) | |
193 | err = -EBUSY; /* invalid */ | |
194 | } else if (idx >= SNDRV_CARDS) | |
195 | err = -ENODEV; | |
196 | if (err < 0) { | |
746df948 | 197 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
198 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
199 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
200 | goto __error; |
201 | } | |
202 | snd_cards_lock |= 1 << idx; /* lock it */ | |
a93bbaa7 TI |
203 | if (idx >= snd_ecards_limit) |
204 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 205 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
206 | card->number = idx; |
207 | card->module = module; | |
208 | INIT_LIST_HEAD(&card->devices); | |
209 | init_rwsem(&card->controls_rwsem); | |
210 | rwlock_init(&card->ctl_files_rwlock); | |
211 | INIT_LIST_HEAD(&card->controls); | |
212 | INIT_LIST_HEAD(&card->ctl_files); | |
213 | spin_lock_init(&card->files_lock); | |
118dd6bf | 214 | INIT_LIST_HEAD(&card->files_list); |
1da177e4 | 215 | init_waitqueue_head(&card->shutdown_sleep); |
a0830dbd | 216 | atomic_set(&card->refcount, 0); |
1da177e4 | 217 | #ifdef CONFIG_PM |
1a60d4c5 | 218 | mutex_init(&card->power_lock); |
1da177e4 LT |
219 | init_waitqueue_head(&card->power_sleep); |
220 | #endif | |
221 | /* the control interface cannot be accessed from the user space until */ | |
222 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
223 | err = snd_ctl_create(card); |
224 | if (err < 0) { | |
225 | snd_printk(KERN_ERR "unable to register control minors\n"); | |
1da177e4 LT |
226 | goto __error; |
227 | } | |
53fb1e63 TI |
228 | err = snd_info_card_create(card); |
229 | if (err < 0) { | |
230 | snd_printk(KERN_ERR "unable to create card info\n"); | |
1da177e4 LT |
231 | goto __error_ctl; |
232 | } | |
233 | if (extra_size > 0) | |
512bbd6a | 234 | card->private_data = (char *)card + sizeof(struct snd_card); |
53fb1e63 TI |
235 | *card_ret = card; |
236 | return 0; | |
1da177e4 LT |
237 | |
238 | __error_ctl: | |
239 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
240 | __error: | |
241 | kfree(card); | |
53fb1e63 | 242 | return err; |
1da177e4 | 243 | } |
53fb1e63 | 244 | EXPORT_SYMBOL(snd_card_create); |
c0d3fb39 | 245 | |
746df948 TI |
246 | /* return non-zero if a card is already locked */ |
247 | int snd_card_locked(int card) | |
248 | { | |
249 | int locked; | |
250 | ||
251 | mutex_lock(&snd_card_mutex); | |
252 | locked = snd_cards_lock & (1 << card); | |
253 | mutex_unlock(&snd_card_mutex); | |
254 | return locked; | |
255 | } | |
256 | ||
b3b0abe1 CL |
257 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
258 | { | |
259 | return -ENODEV; | |
260 | } | |
261 | ||
262 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
263 | size_t count, loff_t *offset) | |
264 | { | |
265 | return -ENODEV; | |
266 | } | |
267 | ||
268 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
269 | size_t count, loff_t *offset) | |
270 | { | |
271 | return -ENODEV; | |
272 | } | |
273 | ||
a9edfc60 KW |
274 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
275 | { | |
276 | struct snd_monitor_file *df = NULL, *_df; | |
277 | ||
278 | spin_lock(&shutdown_lock); | |
279 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
280 | if (_df->file == file) { | |
281 | df = _df; | |
118dd6bf | 282 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
283 | break; |
284 | } | |
285 | } | |
286 | spin_unlock(&shutdown_lock); | |
287 | ||
233e70f4 AV |
288 | if (likely(df)) { |
289 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
290 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 291 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 292 | } |
a9edfc60 | 293 | |
9bf8e7dd | 294 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
295 | } |
296 | ||
1da177e4 LT |
297 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
298 | { | |
299 | return POLLERR | POLLNVAL; | |
300 | } | |
301 | ||
b3b0abe1 CL |
302 | static long snd_disconnect_ioctl(struct file *file, |
303 | unsigned int cmd, unsigned long arg) | |
304 | { | |
305 | return -ENODEV; | |
306 | } | |
307 | ||
308 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
309 | { | |
310 | return -ENODEV; | |
311 | } | |
312 | ||
313 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
314 | { | |
315 | return -ENODEV; | |
316 | } | |
317 | ||
9c2e08c5 | 318 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
319 | { |
320 | .owner = THIS_MODULE, | |
321 | .llseek = snd_disconnect_llseek, | |
322 | .read = snd_disconnect_read, | |
323 | .write = snd_disconnect_write, | |
324 | .release = snd_disconnect_release, | |
325 | .poll = snd_disconnect_poll, | |
326 | .unlocked_ioctl = snd_disconnect_ioctl, | |
327 | #ifdef CONFIG_COMPAT | |
328 | .compat_ioctl = snd_disconnect_ioctl, | |
329 | #endif | |
330 | .mmap = snd_disconnect_mmap, | |
331 | .fasync = snd_disconnect_fasync | |
332 | }; | |
333 | ||
1da177e4 LT |
334 | /** |
335 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
336 | * @card: soundcard structure | |
337 | * | |
338 | * Disconnects all APIs from the file-operations (user space). | |
339 | * | |
340 | * Returns zero, otherwise a negative error code. | |
341 | * | |
342 | * Note: The current implementation replaces all active file->f_op with special | |
343 | * dummy file operations (they do nothing except release). | |
344 | */ | |
512bbd6a | 345 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
346 | { |
347 | struct snd_monitor_file *mfile; | |
1da177e4 LT |
348 | int err; |
349 | ||
f18638dc TI |
350 | if (!card) |
351 | return -EINVAL; | |
352 | ||
1da177e4 LT |
353 | spin_lock(&card->files_lock); |
354 | if (card->shutdown) { | |
355 | spin_unlock(&card->files_lock); | |
356 | return 0; | |
357 | } | |
358 | card->shutdown = 1; | |
359 | spin_unlock(&card->files_lock); | |
360 | ||
361 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 362 | mutex_lock(&snd_card_mutex); |
1da177e4 | 363 | snd_cards[card->number] = NULL; |
f18638dc | 364 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 365 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
366 | |
367 | /* phase 2: replace file->f_op with special dummy operations */ | |
368 | ||
369 | spin_lock(&card->files_lock); | |
118dd6bf | 370 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 LT |
371 | /* it's critical part, use endless loop */ |
372 | /* we have no room to fail */ | |
a9edfc60 | 373 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 374 | |
a9edfc60 KW |
375 | spin_lock(&shutdown_lock); |
376 | list_add(&mfile->shutdown_list, &shutdown_files); | |
377 | spin_unlock(&shutdown_lock); | |
1da177e4 | 378 | |
a9edfc60 | 379 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 380 | fops_get(mfile->file->f_op); |
1da177e4 LT |
381 | } |
382 | spin_unlock(&card->files_lock); | |
383 | ||
384 | /* phase 3: notify all connected devices about disconnection */ | |
385 | /* at this point, they cannot respond to any calls except release() */ | |
386 | ||
387 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
388 | if (snd_mixer_oss_notify_callback) | |
389 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
390 | #endif | |
391 | ||
392 | /* notify all devices that we are disconnected */ | |
393 | err = snd_device_disconnect_all(card); | |
394 | if (err < 0) | |
395 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
396 | ||
746d4a02 | 397 | snd_info_card_disconnect(card); |
73d38b13 TI |
398 | if (card->card_dev) { |
399 | device_unregister(card->card_dev); | |
400 | card->card_dev = NULL; | |
401 | } | |
f18638dc TI |
402 | #ifdef CONFIG_PM |
403 | wake_up(&card->power_sleep); | |
73d38b13 | 404 | #endif |
1da177e4 LT |
405 | return 0; |
406 | } | |
407 | ||
c0d3fb39 TI |
408 | EXPORT_SYMBOL(snd_card_disconnect); |
409 | ||
1da177e4 LT |
410 | /** |
411 | * snd_card_free - frees given soundcard structure | |
412 | * @card: soundcard structure | |
413 | * | |
414 | * This function releases the soundcard structure and the all assigned | |
415 | * devices automatically. That is, you don't have to release the devices | |
416 | * by yourself. | |
417 | * | |
418 | * Returns zero. Frees all associated devices and frees the control | |
419 | * interface associated to given soundcard. | |
420 | */ | |
c461482c | 421 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 422 | { |
1da177e4 LT |
423 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
424 | if (snd_mixer_oss_notify_callback) | |
425 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
426 | #endif | |
427 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
428 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
429 | /* Fatal, but this situation should never occur */ | |
430 | } | |
431 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
432 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
433 | /* Fatal, but this situation should never occur */ | |
434 | } | |
435 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
436 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
437 | /* Fatal, but this situation should never occur */ | |
438 | } | |
439 | if (card->private_free) | |
440 | card->private_free(card); | |
746d4a02 | 441 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
442 | if (snd_info_card_free(card) < 0) { |
443 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
444 | /* Not fatal error */ | |
445 | } | |
c461482c TI |
446 | kfree(card); |
447 | return 0; | |
448 | } | |
449 | ||
a0830dbd TI |
450 | /** |
451 | * snd_card_unref - release the reference counter | |
452 | * @card: the card instance | |
453 | * | |
454 | * Decrements the reference counter. When it reaches to zero, wake up | |
455 | * the sleeper and call the destructor if needed. | |
456 | */ | |
457 | void snd_card_unref(struct snd_card *card) | |
458 | { | |
459 | if (atomic_dec_and_test(&card->refcount)) { | |
460 | wake_up(&card->shutdown_sleep); | |
461 | if (card->free_on_last_close) | |
462 | snd_card_do_free(card); | |
463 | } | |
464 | } | |
465 | EXPORT_SYMBOL(snd_card_unref); | |
466 | ||
c461482c TI |
467 | int snd_card_free_when_closed(struct snd_card *card) |
468 | { | |
a0830dbd | 469 | int ret; |
c461482c | 470 | |
a0830dbd TI |
471 | atomic_inc(&card->refcount); |
472 | ret = snd_card_disconnect(card); | |
473 | if (ret) { | |
474 | atomic_dec(&card->refcount); | |
475 | return ret; | |
476 | } | |
c461482c | 477 | |
a0830dbd TI |
478 | card->free_on_last_close = 1; |
479 | if (atomic_dec_and_test(&card->refcount)) | |
c461482c TI |
480 | snd_card_do_free(card); |
481 | return 0; | |
482 | } | |
483 | ||
484 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
485 | ||
486 | int snd_card_free(struct snd_card *card) | |
487 | { | |
f18638dc | 488 | int ret = snd_card_disconnect(card); |
c461482c TI |
489 | if (ret) |
490 | return ret; | |
491 | ||
492 | /* wait, until all devices are ready for the free operation */ | |
a0830dbd | 493 | wait_event(card->shutdown_sleep, !atomic_read(&card->refcount)); |
c461482c | 494 | snd_card_do_free(card); |
1da177e4 LT |
495 | return 0; |
496 | } | |
497 | ||
c0d3fb39 TI |
498 | EXPORT_SYMBOL(snd_card_free); |
499 | ||
e7df2a3a TI |
500 | /* retrieve the last word of shortname or longname */ |
501 | static const char *retrieve_id_from_card_name(const char *name) | |
1da177e4 | 502 | { |
e7df2a3a TI |
503 | const char *spos = name; |
504 | ||
505 | while (*name) { | |
506 | if (isspace(*name) && isalnum(name[1])) | |
507 | spos = name + 1; | |
508 | name++; | |
1da177e4 | 509 | } |
e7df2a3a TI |
510 | return spos; |
511 | } | |
512 | ||
513 | /* return true if the given id string doesn't conflict any other card ids */ | |
514 | static bool card_id_ok(struct snd_card *card, const char *id) | |
515 | { | |
516 | int i; | |
517 | if (!snd_info_check_reserved_words(id)) | |
518 | return false; | |
519 | for (i = 0; i < snd_ecards_limit; i++) { | |
520 | if (snd_cards[i] && snd_cards[i] != card && | |
521 | !strcmp(snd_cards[i]->id, id)) | |
522 | return false; | |
1da177e4 | 523 | } |
e7df2a3a TI |
524 | return true; |
525 | } | |
1da177e4 | 526 | |
e7df2a3a TI |
527 | /* copy to card->id only with valid letters from nid */ |
528 | static void copy_valid_id_string(struct snd_card *card, const char *src, | |
529 | const char *nid) | |
530 | { | |
531 | char *id = card->id; | |
532 | ||
533 | while (*nid && !isalnum(*nid)) | |
534 | nid++; | |
535 | if (isdigit(*nid)) | |
536 | *id++ = isalpha(*src) ? *src : 'D'; | |
537 | while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
538 | if (isalnum(*nid)) | |
539 | *id++ = *nid; | |
540 | nid++; | |
541 | } | |
542 | *id = 0; | |
543 | } | |
544 | ||
545 | /* Set card->id from the given string | |
546 | * If the string conflicts with other ids, add a suffix to make it unique. | |
547 | */ | |
548 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *src, | |
549 | const char *nid) | |
550 | { | |
551 | int len, loops; | |
552 | bool with_suffix; | |
553 | bool is_default = false; | |
554 | char *id; | |
1da177e4 | 555 | |
e7df2a3a TI |
556 | copy_valid_id_string(card, src, nid); |
557 | id = card->id; | |
558 | ||
559 | again: | |
560 | /* use "Default" for obviously invalid strings | |
561 | * ("card" conflicts with proc directories) | |
562 | */ | |
563 | if (!*id || !strncmp(id, "card", 4)) { | |
d8e4f9ae | 564 | strcpy(id, "Default"); |
e7df2a3a TI |
565 | is_default = true; |
566 | } | |
1da177e4 | 567 | |
e7df2a3a TI |
568 | with_suffix = false; |
569 | for (loops = 0; loops < SNDRV_CARDS; loops++) { | |
570 | if (card_id_ok(card, id)) | |
571 | return; /* OK */ | |
1da177e4 | 572 | |
1da177e4 | 573 | len = strlen(id); |
e7df2a3a TI |
574 | if (!with_suffix) { |
575 | /* add the "_X" suffix */ | |
576 | char *spos = id + len; | |
577 | if (len > sizeof(card->id) - 3) | |
578 | spos = id + sizeof(card->id) - 3; | |
579 | strcpy(spos, "_1"); | |
580 | with_suffix = true; | |
1da177e4 | 581 | } else { |
e7df2a3a TI |
582 | /* modify the existing suffix */ |
583 | if (id[len - 1] != '9') | |
584 | id[len - 1]++; | |
585 | else | |
586 | id[len - 1] = 'A'; | |
1da177e4 LT |
587 | } |
588 | } | |
e7df2a3a TI |
589 | /* fallback to the default id */ |
590 | if (!is_default) { | |
591 | *id = 0; | |
592 | goto again; | |
593 | } | |
594 | /* last resort... */ | |
595 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); | |
596 | if (card->proc_root->name) | |
597 | strcpy(card->id, card->proc_root->name); | |
1da177e4 LT |
598 | } |
599 | ||
872c7820 MB |
600 | /** |
601 | * snd_card_set_id - set card identification name | |
602 | * @card: soundcard structure | |
603 | * @nid: new identification string | |
604 | * | |
605 | * This function sets the card identification and checks for name | |
606 | * collisions. | |
607 | */ | |
608 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
609 | { | |
5fdc18d9 JK |
610 | /* check if user specified own card->id */ |
611 | if (card->id[0] != '\0') | |
612 | return; | |
613 | mutex_lock(&snd_card_mutex); | |
e7df2a3a | 614 | snd_card_set_id_no_lock(card, nid, nid); |
5fdc18d9 | 615 | mutex_unlock(&snd_card_mutex); |
872c7820 | 616 | } |
10a8ebbb JK |
617 | EXPORT_SYMBOL(snd_card_set_id); |
618 | ||
9fb6198e JK |
619 | static ssize_t |
620 | card_id_show_attr(struct device *dev, | |
621 | struct device_attribute *attr, char *buf) | |
622 | { | |
623 | struct snd_card *card = dev_get_drvdata(dev); | |
624 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
625 | } | |
626 | ||
627 | static ssize_t | |
628 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
629 | const char *buf, size_t count) | |
630 | { | |
631 | struct snd_card *card = dev_get_drvdata(dev); | |
632 | char buf1[sizeof(card->id)]; | |
633 | size_t copy = count > sizeof(card->id) - 1 ? | |
634 | sizeof(card->id) - 1 : count; | |
635 | size_t idx; | |
636 | int c; | |
637 | ||
638 | for (idx = 0; idx < copy; idx++) { | |
639 | c = buf[idx]; | |
640 | if (!isalnum(c) && c != '_' && c != '-') | |
641 | return -EINVAL; | |
642 | } | |
643 | memcpy(buf1, buf, copy); | |
644 | buf1[copy] = '\0'; | |
645 | mutex_lock(&snd_card_mutex); | |
e7df2a3a | 646 | if (!card_id_ok(NULL, buf1)) { |
9fb6198e JK |
647 | mutex_unlock(&snd_card_mutex); |
648 | return -EEXIST; | |
649 | } | |
9fb6198e | 650 | strcpy(card->id, buf1); |
c2eb9c4e | 651 | snd_info_card_id_change(card); |
9fb6198e JK |
652 | mutex_unlock(&snd_card_mutex); |
653 | ||
654 | return count; | |
655 | } | |
656 | ||
657 | static struct device_attribute card_id_attrs = | |
658 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); | |
659 | ||
660 | static ssize_t | |
661 | card_number_show_attr(struct device *dev, | |
662 | struct device_attribute *attr, char *buf) | |
663 | { | |
664 | struct snd_card *card = dev_get_drvdata(dev); | |
665 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); | |
666 | } | |
667 | ||
668 | static struct device_attribute card_number_attrs = | |
669 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); | |
9fb6198e | 670 | |
1da177e4 LT |
671 | /** |
672 | * snd_card_register - register the soundcard | |
673 | * @card: soundcard structure | |
674 | * | |
675 | * This function registers all the devices assigned to the soundcard. | |
676 | * Until calling this, the ALSA control interface is blocked from the | |
677 | * external accesses. Thus, you should call this function at the end | |
678 | * of the initialization of the card. | |
679 | * | |
b595076a | 680 | * Returns zero otherwise a negative error code if the registration failed. |
1da177e4 | 681 | */ |
512bbd6a | 682 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
683 | { |
684 | int err; | |
1da177e4 | 685 | |
7eaa943c TI |
686 | if (snd_BUG_ON(!card)) |
687 | return -EINVAL; | |
39aba963 | 688 | |
7d2aae1e | 689 | if (!card->card_dev) { |
abe9ab8f | 690 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 691 | MKDEV(0, 0), card, |
abe9ab8f | 692 | "card%i", card->number); |
7d2aae1e TI |
693 | if (IS_ERR(card->card_dev)) |
694 | card->card_dev = NULL; | |
d80f19fa | 695 | } |
39aba963 | 696 | |
1da177e4 LT |
697 | if ((err = snd_device_register_all(card)) < 0) |
698 | return err; | |
746df948 | 699 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
700 | if (snd_cards[card->number]) { |
701 | /* already registered */ | |
746df948 | 702 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
703 | return 0; |
704 | } | |
e7df2a3a TI |
705 | if (*card->id) { |
706 | /* make a unique id name from the given string */ | |
707 | char tmpid[sizeof(card->id)]; | |
708 | memcpy(tmpid, card->id, sizeof(card->id)); | |
709 | snd_card_set_id_no_lock(card, tmpid, tmpid); | |
710 | } else { | |
711 | /* create an id from either shortname or longname */ | |
712 | const char *src; | |
713 | src = *card->shortname ? card->shortname : card->longname; | |
714 | snd_card_set_id_no_lock(card, src, | |
715 | retrieve_id_from_card_name(src)); | |
716 | } | |
1da177e4 | 717 | snd_cards[card->number] = card; |
746df948 | 718 | mutex_unlock(&snd_card_mutex); |
e28563cc | 719 | init_info_for_card(card); |
1da177e4 LT |
720 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
721 | if (snd_mixer_oss_notify_callback) | |
722 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e | 723 | #endif |
9fb6198e | 724 | if (card->card_dev) { |
2af75293 HE |
725 | err = device_create_file(card->card_dev, &card_id_attrs); |
726 | if (err < 0) | |
727 | return err; | |
728 | err = device_create_file(card->card_dev, &card_number_attrs); | |
729 | if (err < 0) | |
730 | return err; | |
9fb6198e | 731 | } |
39aba963 | 732 | |
1da177e4 LT |
733 | return 0; |
734 | } | |
735 | ||
c0d3fb39 TI |
736 | EXPORT_SYMBOL(snd_card_register); |
737 | ||
e28563cc | 738 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 739 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 740 | |
a381a7a6 TI |
741 | static void snd_card_info_read(struct snd_info_entry *entry, |
742 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
743 | { |
744 | int idx, count; | |
512bbd6a | 745 | struct snd_card *card; |
1da177e4 LT |
746 | |
747 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 748 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
749 | if ((card = snd_cards[idx]) != NULL) { |
750 | count++; | |
d001544d | 751 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
752 | idx, |
753 | card->id, | |
754 | card->driver, | |
755 | card->shortname); | |
d001544d | 756 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
757 | card->longname); |
758 | } | |
746df948 | 759 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
760 | } |
761 | if (!count) | |
762 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
763 | } | |
764 | ||
e28563cc | 765 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 766 | |
512bbd6a | 767 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
768 | { |
769 | int idx, count; | |
512bbd6a | 770 | struct snd_card *card; |
1da177e4 LT |
771 | |
772 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 773 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
774 | if ((card = snd_cards[idx]) != NULL) { |
775 | count++; | |
776 | snd_iprintf(buffer, "%s\n", card->longname); | |
777 | } | |
746df948 | 778 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
779 | } |
780 | if (!count) { | |
781 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
782 | } | |
783 | } | |
784 | ||
785 | #endif | |
786 | ||
787 | #ifdef MODULE | |
512bbd6a TI |
788 | static struct snd_info_entry *snd_card_module_info_entry; |
789 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
790 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
791 | { |
792 | int idx; | |
512bbd6a | 793 | struct snd_card *card; |
1da177e4 LT |
794 | |
795 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 796 | mutex_lock(&snd_card_mutex); |
1da177e4 | 797 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
798 | snd_iprintf(buffer, "%2i %s\n", |
799 | idx, card->module->name); | |
746df948 | 800 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
801 | } |
802 | } | |
803 | #endif | |
804 | ||
805 | int __init snd_card_info_init(void) | |
806 | { | |
512bbd6a | 807 | struct snd_info_entry *entry; |
1da177e4 LT |
808 | |
809 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
810 | if (! entry) |
811 | return -ENOMEM; | |
1da177e4 LT |
812 | entry->c.text.read = snd_card_info_read; |
813 | if (snd_info_register(entry) < 0) { | |
814 | snd_info_free_entry(entry); | |
815 | return -ENOMEM; | |
816 | } | |
817 | snd_card_info_entry = entry; | |
818 | ||
819 | #ifdef MODULE | |
820 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
821 | if (entry) { | |
1da177e4 LT |
822 | entry->c.text.read = snd_card_module_info_read; |
823 | if (snd_info_register(entry) < 0) | |
824 | snd_info_free_entry(entry); | |
825 | else | |
826 | snd_card_module_info_entry = entry; | |
827 | } | |
828 | #endif | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | int __exit snd_card_info_done(void) | |
834 | { | |
746d4a02 | 835 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 836 | #ifdef MODULE |
746d4a02 | 837 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
838 | #endif |
839 | return 0; | |
840 | } | |
841 | ||
e28563cc TI |
842 | #endif /* CONFIG_PROC_FS */ |
843 | ||
1da177e4 LT |
844 | /** |
845 | * snd_component_add - add a component string | |
846 | * @card: soundcard structure | |
847 | * @component: the component id string | |
848 | * | |
849 | * This function adds the component id string to the supported list. | |
850 | * The component can be referred from the alsa-lib. | |
851 | * | |
852 | * Returns zero otherwise a negative error code. | |
853 | */ | |
854 | ||
512bbd6a | 855 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
856 | { |
857 | char *ptr; | |
858 | int len = strlen(component); | |
859 | ||
860 | ptr = strstr(card->components, component); | |
861 | if (ptr != NULL) { | |
862 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
863 | return 1; | |
864 | } | |
865 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
866 | snd_BUG(); | |
867 | return -ENOMEM; | |
868 | } | |
869 | if (card->components[0] != '\0') | |
870 | strcat(card->components, " "); | |
871 | strcat(card->components, component); | |
872 | return 0; | |
873 | } | |
874 | ||
c0d3fb39 TI |
875 | EXPORT_SYMBOL(snd_component_add); |
876 | ||
1da177e4 LT |
877 | /** |
878 | * snd_card_file_add - add the file to the file list of the card | |
879 | * @card: soundcard structure | |
880 | * @file: file pointer | |
881 | * | |
882 | * This function adds the file to the file linked-list of the card. | |
883 | * This linked-list is used to keep tracking the connection state, | |
884 | * and to avoid the release of busy resources by hotplug. | |
885 | * | |
886 | * Returns zero or a negative error code. | |
887 | */ | |
512bbd6a | 888 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
889 | { |
890 | struct snd_monitor_file *mfile; | |
891 | ||
892 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
893 | if (mfile == NULL) | |
894 | return -ENOMEM; | |
895 | mfile->file = file; | |
a9edfc60 | 896 | mfile->disconnected_f_op = NULL; |
a45e3d6b | 897 | INIT_LIST_HEAD(&mfile->shutdown_list); |
1da177e4 LT |
898 | spin_lock(&card->files_lock); |
899 | if (card->shutdown) { | |
900 | spin_unlock(&card->files_lock); | |
901 | kfree(mfile); | |
902 | return -ENODEV; | |
903 | } | |
118dd6bf | 904 | list_add(&mfile->list, &card->files_list); |
a0830dbd | 905 | atomic_inc(&card->refcount); |
1da177e4 LT |
906 | spin_unlock(&card->files_lock); |
907 | return 0; | |
908 | } | |
909 | ||
c0d3fb39 TI |
910 | EXPORT_SYMBOL(snd_card_file_add); |
911 | ||
1da177e4 LT |
912 | /** |
913 | * snd_card_file_remove - remove the file from the file list | |
914 | * @card: soundcard structure | |
915 | * @file: file pointer | |
916 | * | |
917 | * This function removes the file formerly added to the card via | |
918 | * snd_card_file_add() function. | |
2b29b13c TI |
919 | * If all files are removed and snd_card_free_when_closed() was |
920 | * called beforehand, it processes the pending release of | |
921 | * resources. | |
1da177e4 LT |
922 | * |
923 | * Returns zero or a negative error code. | |
924 | */ | |
512bbd6a | 925 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 926 | { |
118dd6bf | 927 | struct snd_monitor_file *mfile, *found = NULL; |
1da177e4 LT |
928 | |
929 | spin_lock(&card->files_lock); | |
118dd6bf | 930 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 931 | if (mfile->file == file) { |
118dd6bf | 932 | list_del(&mfile->list); |
a45e3d6b TI |
933 | spin_lock(&shutdown_lock); |
934 | list_del(&mfile->shutdown_list); | |
935 | spin_unlock(&shutdown_lock); | |
118dd6bf TI |
936 | if (mfile->disconnected_f_op) |
937 | fops_put(mfile->disconnected_f_op); | |
938 | found = mfile; | |
1da177e4 LT |
939 | break; |
940 | } | |
a9edfc60 | 941 | } |
c461482c | 942 | spin_unlock(&card->files_lock); |
118dd6bf | 943 | if (!found) { |
1da177e4 LT |
944 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
945 | return -ENOENT; | |
946 | } | |
118dd6bf | 947 | kfree(found); |
a0830dbd | 948 | snd_card_unref(card); |
1da177e4 LT |
949 | return 0; |
950 | } | |
951 | ||
c0d3fb39 TI |
952 | EXPORT_SYMBOL(snd_card_file_remove); |
953 | ||
1da177e4 LT |
954 | #ifdef CONFIG_PM |
955 | /** | |
956 | * snd_power_wait - wait until the power-state is changed. | |
957 | * @card: soundcard structure | |
958 | * @power_state: expected power state | |
1da177e4 LT |
959 | * |
960 | * Waits until the power-state is changed. | |
961 | * | |
962 | * Note: the power lock must be active before call. | |
963 | */ | |
cbac4b0c | 964 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
965 | { |
966 | wait_queue_t wait; | |
967 | int result = 0; | |
968 | ||
969 | /* fastpath */ | |
970 | if (snd_power_get_state(card) == power_state) | |
971 | return 0; | |
972 | init_waitqueue_entry(&wait, current); | |
973 | add_wait_queue(&card->power_sleep, &wait); | |
974 | while (1) { | |
975 | if (card->shutdown) { | |
976 | result = -ENODEV; | |
977 | break; | |
978 | } | |
979 | if (snd_power_get_state(card) == power_state) | |
980 | break; | |
1da177e4 LT |
981 | set_current_state(TASK_UNINTERRUPTIBLE); |
982 | snd_power_unlock(card); | |
983 | schedule_timeout(30 * HZ); | |
984 | snd_power_lock(card); | |
985 | } | |
986 | remove_wait_queue(&card->power_sleep, &wait); | |
987 | return result; | |
988 | } | |
989 | ||
c0d3fb39 | 990 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 991 | #endif /* CONFIG_PM */ |