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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Initialization routines | |
c1017a4c | 4 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
5 | */ |
6 | ||
1da177e4 LT |
7 | #include <linux/init.h> |
8 | #include <linux/sched.h> | |
da155d5b | 9 | #include <linux/module.h> |
51990e82 | 10 | #include <linux/device.h> |
1da177e4 LT |
11 | #include <linux/file.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/time.h> | |
14 | #include <linux/ctype.h> | |
1da177e4 | 15 | #include <linux/pm.h> |
2d670ea2 | 16 | #include <linux/debugfs.h> |
f2464064 | 17 | #include <linux/completion.h> |
29bb274e | 18 | #include <linux/interrupt.h> |
d052d1be | 19 | |
1da177e4 LT |
20 | #include <sound/core.h> |
21 | #include <sound/control.h> | |
22 | #include <sound/info.h> | |
23 | ||
82a783f4 TI |
24 | /* monitor files for graceful shutdown (hotplug) */ |
25 | struct snd_monitor_file { | |
26 | struct file *file; | |
27 | const struct file_operations *disconnected_f_op; | |
28 | struct list_head shutdown_list; /* still need to shutdown */ | |
29 | struct list_head list; /* link of monitor files */ | |
30 | }; | |
31 | ||
a9edfc60 KW |
32 | static DEFINE_SPINLOCK(shutdown_lock); |
33 | static LIST_HEAD(shutdown_files); | |
34 | ||
9c2e08c5 | 35 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 36 | |
7bb2491b TI |
37 | /* locked for registering/using */ |
38 | static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS); | |
f4fa9689 | 39 | static struct snd_card *snd_cards[SNDRV_CARDS]; |
c0d3fb39 | 40 | |
746df948 | 41 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 | 42 | |
304cd07f TI |
43 | static char *slots[SNDRV_CARDS]; |
44 | module_param_array(slots, charp, NULL, 0444); | |
45 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); | |
46 | ||
a93bbaa7 | 47 | /* return non-zero if the given index is reserved for the given |
304cd07f TI |
48 | * module via slots option |
49 | */ | |
a93bbaa7 | 50 | static int module_slot_match(struct module *module, int idx) |
304cd07f | 51 | { |
a93bbaa7 | 52 | int match = 1; |
304cd07f | 53 | #ifdef MODULE |
a93bbaa7 TI |
54 | const char *s1, *s2; |
55 | ||
60f6fef8 | 56 | if (!module || !*module->name || !slots[idx]) |
304cd07f | 57 | return 0; |
a93bbaa7 TI |
58 | |
59 | s1 = module->name; | |
60 | s2 = slots[idx]; | |
61 | if (*s2 == '!') { | |
62 | match = 0; /* negative match */ | |
63 | s2++; | |
64 | } | |
304cd07f TI |
65 | /* compare module name strings |
66 | * hyphens are handled as equivalent with underscore | |
67 | */ | |
68 | for (;;) { | |
69 | char c1 = *s1++; | |
70 | char c2 = *s2++; | |
71 | if (c1 == '-') | |
72 | c1 = '_'; | |
73 | if (c2 == '-') | |
74 | c2 = '_'; | |
75 | if (c1 != c2) | |
a93bbaa7 | 76 | return !match; |
304cd07f TI |
77 | if (!c1) |
78 | break; | |
79 | } | |
a93bbaa7 TI |
80 | #endif /* MODULE */ |
81 | return match; | |
304cd07f TI |
82 | } |
83 | ||
8eeaa2f9 | 84 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
512bbd6a | 85 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 86 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
87 | #endif |
88 | ||
deb6596f TI |
89 | static int check_empty_slot(struct module *module, int slot) |
90 | { | |
91 | return !slots[slot] || !*slots[slot]; | |
92 | } | |
93 | ||
94 | /* return an empty slot number (>= 0) found in the given bitmask @mask. | |
95 | * @mask == -1 == 0xffffffff means: take any free slot up to 32 | |
96 | * when no slot is available, return the original @mask as is. | |
97 | */ | |
98 | static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int), | |
99 | struct module *module) | |
100 | { | |
101 | int slot; | |
102 | ||
103 | for (slot = 0; slot < SNDRV_CARDS; slot++) { | |
104 | if (slot < 32 && !(mask & (1U << slot))) | |
105 | continue; | |
106 | if (!test_bit(slot, snd_cards_lock)) { | |
107 | if (check(module, slot)) | |
108 | return slot; /* found */ | |
109 | } | |
110 | } | |
111 | return mask; /* unchanged */ | |
112 | } | |
113 | ||
4b440be6 TI |
114 | /* the default release callback set in snd_device_initialize() below; |
115 | * this is just NOP for now, as almost all jobs are already done in | |
116 | * dev_free callback of snd_device chain instead. | |
117 | */ | |
118 | static void default_release(struct device *dev) | |
119 | { | |
120 | } | |
121 | ||
122 | /** | |
123 | * snd_device_initialize - Initialize struct device for sound devices | |
124 | * @dev: device to initialize | |
125 | * @card: card to assign, optional | |
126 | */ | |
127 | void snd_device_initialize(struct device *dev, struct snd_card *card) | |
128 | { | |
129 | device_initialize(dev); | |
130 | if (card) | |
131 | dev->parent = &card->card_dev; | |
132 | dev->class = sound_class; | |
133 | dev->release = default_release; | |
134 | } | |
135 | EXPORT_SYMBOL_GPL(snd_device_initialize); | |
136 | ||
e8ad415b TI |
137 | static int snd_card_init(struct snd_card *card, struct device *parent, |
138 | int idx, const char *xid, struct module *module, | |
139 | size_t extra_size); | |
8bfb181c | 140 | static int snd_card_do_free(struct snd_card *card); |
6bbc7fed | 141 | static const struct attribute_group card_dev_attr_group; |
8bfb181c TI |
142 | |
143 | static void release_card_device(struct device *dev) | |
144 | { | |
145 | snd_card_do_free(dev_to_snd_card(dev)); | |
146 | } | |
147 | ||
1da177e4 | 148 | /** |
393aa9c1 TI |
149 | * snd_card_new - create and initialize a soundcard structure |
150 | * @parent: the parent device object | |
1da177e4 LT |
151 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
152 | * @xid: card identification (ASCII string) | |
153 | * @module: top level module for locking | |
154 | * @extra_size: allocate this extra size after the main soundcard structure | |
53fb1e63 | 155 | * @card_ret: the pointer to store the created card instance |
1da177e4 | 156 | * |
53fb1e63 TI |
157 | * The function allocates snd_card instance via kzalloc with the given |
158 | * space for the driver to use freely. The allocated struct is stored | |
159 | * in the given card_ret pointer. | |
160 | * | |
eb7c06e8 | 161 | * Return: Zero if successful or a negative error code. |
1da177e4 | 162 | */ |
393aa9c1 | 163 | int snd_card_new(struct device *parent, int idx, const char *xid, |
53fb1e63 TI |
164 | struct module *module, int extra_size, |
165 | struct snd_card **card_ret) | |
1da177e4 | 166 | { |
512bbd6a | 167 | struct snd_card *card; |
deb6596f | 168 | int err; |
1da177e4 | 169 | |
53fb1e63 TI |
170 | if (snd_BUG_ON(!card_ret)) |
171 | return -EINVAL; | |
172 | *card_ret = NULL; | |
173 | ||
1da177e4 LT |
174 | if (extra_size < 0) |
175 | extra_size = 0; | |
ca2c0966 | 176 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
177 | if (!card) |
178 | return -ENOMEM; | |
e8ad415b TI |
179 | |
180 | err = snd_card_init(card, parent, idx, xid, module, extra_size); | |
181 | if (err < 0) { | |
182 | kfree(card); | |
183 | return err; | |
184 | } | |
185 | ||
186 | *card_ret = card; | |
187 | return 0; | |
188 | } | |
189 | EXPORT_SYMBOL(snd_card_new); | |
190 | ||
191 | static void __snd_card_release(struct device *dev, void *data) | |
192 | { | |
193 | snd_card_free(data); | |
194 | } | |
195 | ||
196 | /** | |
197 | * snd_devm_card_new - managed snd_card object creation | |
198 | * @parent: the parent device object | |
199 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
200 | * @xid: card identification (ASCII string) | |
201 | * @module: top level module for locking | |
202 | * @extra_size: allocate this extra size after the main soundcard structure | |
203 | * @card_ret: the pointer to store the created card instance | |
204 | * | |
205 | * This function works like snd_card_new() but manages the allocated resource | |
206 | * via devres, i.e. you don't need to free explicitly. | |
207 | * | |
208 | * When a snd_card object is created with this function and registered via | |
209 | * snd_card_register(), the very first devres action to call snd_card_free() | |
210 | * is added automatically. In that way, the resource disconnection is assured | |
211 | * at first, then released in the expected order. | |
212 | */ | |
213 | int snd_devm_card_new(struct device *parent, int idx, const char *xid, | |
214 | struct module *module, size_t extra_size, | |
215 | struct snd_card **card_ret) | |
216 | { | |
217 | struct snd_card *card; | |
218 | int err; | |
219 | ||
220 | *card_ret = NULL; | |
221 | card = devres_alloc(__snd_card_release, sizeof(*card) + extra_size, | |
222 | GFP_KERNEL); | |
223 | if (!card) | |
224 | return -ENOMEM; | |
225 | card->managed = true; | |
226 | err = snd_card_init(card, parent, idx, xid, module, extra_size); | |
227 | if (err < 0) { | |
228 | devres_free(card); | |
229 | return err; | |
230 | } | |
231 | ||
232 | devres_add(parent, card); | |
233 | *card_ret = card; | |
234 | return 0; | |
235 | } | |
236 | EXPORT_SYMBOL_GPL(snd_devm_card_new); | |
237 | ||
238 | static int snd_card_init(struct snd_card *card, struct device *parent, | |
239 | int idx, const char *xid, struct module *module, | |
240 | size_t extra_size) | |
241 | { | |
242 | int err; | |
243 | #ifdef CONFIG_SND_DEBUG | |
244 | char name[8]; | |
245 | #endif | |
246 | ||
8bfb181c TI |
247 | if (extra_size > 0) |
248 | card->private_data = (char *)card + sizeof(struct snd_card); | |
10a8ebbb | 249 | if (xid) |
75b1a8f9 | 250 | strscpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 251 | err = 0; |
746df948 | 252 | mutex_lock(&snd_card_mutex); |
deb6596f TI |
253 | if (idx < 0) /* first check the matching module-name slot */ |
254 | idx = get_slot_from_bitmask(idx, module_slot_match, module); | |
255 | if (idx < 0) /* if not matched, assign an empty slot */ | |
256 | idx = get_slot_from_bitmask(idx, check_empty_slot, module); | |
a93bbaa7 TI |
257 | if (idx < 0) |
258 | err = -ENODEV; | |
259 | else if (idx < snd_ecards_limit) { | |
7bb2491b | 260 | if (test_bit(idx, snd_cards_lock)) |
a93bbaa7 TI |
261 | err = -EBUSY; /* invalid */ |
262 | } else if (idx >= SNDRV_CARDS) | |
263 | err = -ENODEV; | |
264 | if (err < 0) { | |
746df948 | 265 | mutex_unlock(&snd_card_mutex); |
f2f9307a | 266 | dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n", |
5c33dd70 | 267 | idx, snd_ecards_limit - 1, err); |
8bfb181c | 268 | return err; |
1da177e4 | 269 | } |
7bb2491b | 270 | set_bit(idx, snd_cards_lock); /* lock it */ |
a93bbaa7 TI |
271 | if (idx >= snd_ecards_limit) |
272 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 273 | mutex_unlock(&snd_card_mutex); |
393aa9c1 | 274 | card->dev = parent; |
1da177e4 | 275 | card->number = idx; |
81033c6b TI |
276 | #ifdef MODULE |
277 | WARN_ON(!module); | |
1da177e4 | 278 | card->module = module; |
81033c6b | 279 | #endif |
1da177e4 LT |
280 | INIT_LIST_HEAD(&card->devices); |
281 | init_rwsem(&card->controls_rwsem); | |
282 | rwlock_init(&card->ctl_files_rwlock); | |
283 | INIT_LIST_HEAD(&card->controls); | |
284 | INIT_LIST_HEAD(&card->ctl_files); | |
285 | spin_lock_init(&card->files_lock); | |
118dd6bf | 286 | INIT_LIST_HEAD(&card->files_list); |
d4cfb30f | 287 | mutex_init(&card->memory_mutex); |
1da177e4 | 288 | #ifdef CONFIG_PM |
1da177e4 | 289 | init_waitqueue_head(&card->power_sleep); |
e94fdbd7 TI |
290 | init_waitqueue_head(&card->power_ref_sleep); |
291 | atomic_set(&card->power_ref, 0); | |
1da177e4 | 292 | #endif |
c44027c8 | 293 | init_waitqueue_head(&card->remove_sleep); |
fabb26dc | 294 | card->sync_irq = -1; |
8bfb181c TI |
295 | |
296 | device_initialize(&card->card_dev); | |
297 | card->card_dev.parent = parent; | |
298 | card->card_dev.class = sound_class; | |
299 | card->card_dev.release = release_card_device; | |
6bbc7fed TI |
300 | card->card_dev.groups = card->dev_groups; |
301 | card->dev_groups[0] = &card_dev_attr_group; | |
8bfb181c TI |
302 | err = kobject_set_name(&card->card_dev.kobj, "card%d", idx); |
303 | if (err < 0) | |
304 | goto __error; | |
305 | ||
de65360b HK |
306 | snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s", |
307 | dev_driver_string(card->dev), dev_name(&card->card_dev)); | |
308 | ||
1da177e4 LT |
309 | /* the control interface cannot be accessed from the user space until */ |
310 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
311 | err = snd_ctl_create(card); |
312 | if (err < 0) { | |
f2f9307a | 313 | dev_err(parent, "unable to register control minors\n"); |
1da177e4 LT |
314 | goto __error; |
315 | } | |
53fb1e63 TI |
316 | err = snd_info_card_create(card); |
317 | if (err < 0) { | |
f2f9307a | 318 | dev_err(parent, "unable to create card info\n"); |
1da177e4 LT |
319 | goto __error_ctl; |
320 | } | |
2d670ea2 HW |
321 | |
322 | #ifdef CONFIG_SND_DEBUG | |
323 | sprintf(name, "card%d", idx); | |
324 | card->debugfs_root = debugfs_create_dir(name, sound_debugfs_root); | |
325 | #endif | |
53fb1e63 | 326 | return 0; |
1da177e4 LT |
327 | |
328 | __error_ctl: | |
289ca025 | 329 | snd_device_free_all(card); |
1da177e4 | 330 | __error: |
8bfb181c | 331 | put_device(&card->card_dev); |
53fb1e63 | 332 | return err; |
1da177e4 | 333 | } |
c0d3fb39 | 334 | |
f4fa9689 TI |
335 | /** |
336 | * snd_card_ref - Get the card object from the index | |
337 | * @idx: the card index | |
338 | * | |
339 | * Returns a card object corresponding to the given index or NULL if not found. | |
340 | * Release the object via snd_card_unref(). | |
341 | */ | |
342 | struct snd_card *snd_card_ref(int idx) | |
343 | { | |
344 | struct snd_card *card; | |
345 | ||
346 | mutex_lock(&snd_card_mutex); | |
347 | card = snd_cards[idx]; | |
348 | if (card) | |
349 | get_device(&card->card_dev); | |
350 | mutex_unlock(&snd_card_mutex); | |
351 | return card; | |
352 | } | |
353 | EXPORT_SYMBOL_GPL(snd_card_ref); | |
354 | ||
746df948 TI |
355 | /* return non-zero if a card is already locked */ |
356 | int snd_card_locked(int card) | |
357 | { | |
358 | int locked; | |
359 | ||
360 | mutex_lock(&snd_card_mutex); | |
7bb2491b | 361 | locked = test_bit(card, snd_cards_lock); |
746df948 TI |
362 | mutex_unlock(&snd_card_mutex); |
363 | return locked; | |
364 | } | |
365 | ||
b3b0abe1 CL |
366 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
367 | { | |
368 | return -ENODEV; | |
369 | } | |
370 | ||
371 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
372 | size_t count, loff_t *offset) | |
373 | { | |
374 | return -ENODEV; | |
375 | } | |
376 | ||
377 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
378 | size_t count, loff_t *offset) | |
379 | { | |
380 | return -ENODEV; | |
381 | } | |
382 | ||
a9edfc60 KW |
383 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
384 | { | |
385 | struct snd_monitor_file *df = NULL, *_df; | |
386 | ||
387 | spin_lock(&shutdown_lock); | |
388 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
389 | if (_df->file == file) { | |
390 | df = _df; | |
118dd6bf | 391 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
392 | break; |
393 | } | |
394 | } | |
395 | spin_unlock(&shutdown_lock); | |
396 | ||
233e70f4 AV |
397 | if (likely(df)) { |
398 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
399 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 400 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 401 | } |
a9edfc60 | 402 | |
9bf8e7dd | 403 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
404 | } |
405 | ||
680ef72a | 406 | static __poll_t snd_disconnect_poll(struct file * file, poll_table * wait) |
1da177e4 | 407 | { |
a9a08845 | 408 | return EPOLLERR | EPOLLNVAL; |
1da177e4 LT |
409 | } |
410 | ||
b3b0abe1 CL |
411 | static long snd_disconnect_ioctl(struct file *file, |
412 | unsigned int cmd, unsigned long arg) | |
413 | { | |
414 | return -ENODEV; | |
415 | } | |
416 | ||
417 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
418 | { | |
419 | return -ENODEV; | |
420 | } | |
421 | ||
422 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
423 | { | |
424 | return -ENODEV; | |
425 | } | |
426 | ||
9c2e08c5 | 427 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
428 | { |
429 | .owner = THIS_MODULE, | |
430 | .llseek = snd_disconnect_llseek, | |
431 | .read = snd_disconnect_read, | |
432 | .write = snd_disconnect_write, | |
433 | .release = snd_disconnect_release, | |
434 | .poll = snd_disconnect_poll, | |
435 | .unlocked_ioctl = snd_disconnect_ioctl, | |
436 | #ifdef CONFIG_COMPAT | |
437 | .compat_ioctl = snd_disconnect_ioctl, | |
438 | #endif | |
439 | .mmap = snd_disconnect_mmap, | |
440 | .fasync = snd_disconnect_fasync | |
441 | }; | |
442 | ||
1da177e4 LT |
443 | /** |
444 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
445 | * @card: soundcard structure | |
446 | * | |
447 | * Disconnects all APIs from the file-operations (user space). | |
448 | * | |
eb7c06e8 | 449 | * Return: Zero, otherwise a negative error code. |
1da177e4 LT |
450 | * |
451 | * Note: The current implementation replaces all active file->f_op with special | |
452 | * dummy file operations (they do nothing except release). | |
453 | */ | |
512bbd6a | 454 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
455 | { |
456 | struct snd_monitor_file *mfile; | |
1da177e4 | 457 | |
f18638dc TI |
458 | if (!card) |
459 | return -EINVAL; | |
460 | ||
1da177e4 LT |
461 | spin_lock(&card->files_lock); |
462 | if (card->shutdown) { | |
463 | spin_unlock(&card->files_lock); | |
464 | return 0; | |
465 | } | |
466 | card->shutdown = 1; | |
1da177e4 | 467 | |
2a3f7221 | 468 | /* replace file->f_op with special dummy operations */ |
118dd6bf | 469 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 LT |
470 | /* it's critical part, use endless loop */ |
471 | /* we have no room to fail */ | |
a9edfc60 | 472 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 473 | |
a9edfc60 KW |
474 | spin_lock(&shutdown_lock); |
475 | list_add(&mfile->shutdown_list, &shutdown_files); | |
476 | spin_unlock(&shutdown_lock); | |
1da177e4 | 477 | |
a9edfc60 | 478 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 479 | fops_get(mfile->file->f_op); |
1da177e4 LT |
480 | } |
481 | spin_unlock(&card->files_lock); | |
482 | ||
2a3f7221 | 483 | /* notify all connected devices about disconnection */ |
1da177e4 LT |
484 | /* at this point, they cannot respond to any calls except release() */ |
485 | ||
8eeaa2f9 | 486 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
487 | if (snd_mixer_oss_notify_callback) |
488 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
489 | #endif | |
490 | ||
491 | /* notify all devices that we are disconnected */ | |
e086e303 | 492 | snd_device_disconnect_all(card); |
1da177e4 | 493 | |
29bb274e TI |
494 | if (card->sync_irq > 0) |
495 | synchronize_irq(card->sync_irq); | |
496 | ||
746d4a02 | 497 | snd_info_card_disconnect(card); |
8bfb181c TI |
498 | if (card->registered) { |
499 | device_del(&card->card_dev); | |
500 | card->registered = false; | |
73d38b13 | 501 | } |
2a3f7221 TI |
502 | |
503 | /* disable fops (user space) operations for ALSA API */ | |
504 | mutex_lock(&snd_card_mutex); | |
505 | snd_cards[card->number] = NULL; | |
506 | clear_bit(card->number, snd_cards_lock); | |
507 | mutex_unlock(&snd_card_mutex); | |
508 | ||
f18638dc TI |
509 | #ifdef CONFIG_PM |
510 | wake_up(&card->power_sleep); | |
e94fdbd7 | 511 | snd_power_sync_ref(card); |
73d38b13 | 512 | #endif |
1da177e4 LT |
513 | return 0; |
514 | } | |
c0d3fb39 TI |
515 | EXPORT_SYMBOL(snd_card_disconnect); |
516 | ||
c44027c8 TI |
517 | /** |
518 | * snd_card_disconnect_sync - disconnect card and wait until files get closed | |
519 | * @card: card object to disconnect | |
520 | * | |
521 | * This calls snd_card_disconnect() for disconnecting all belonging components | |
522 | * and waits until all pending files get closed. | |
523 | * It assures that all accesses from user-space finished so that the driver | |
524 | * can release its resources gracefully. | |
525 | */ | |
526 | void snd_card_disconnect_sync(struct snd_card *card) | |
527 | { | |
528 | int err; | |
529 | ||
530 | err = snd_card_disconnect(card); | |
531 | if (err < 0) { | |
532 | dev_err(card->dev, | |
533 | "snd_card_disconnect error (%d), skipping sync\n", | |
534 | err); | |
535 | return; | |
536 | } | |
537 | ||
538 | spin_lock_irq(&card->files_lock); | |
539 | wait_event_lock_irq(card->remove_sleep, | |
540 | list_empty(&card->files_list), | |
541 | card->files_lock); | |
542 | spin_unlock_irq(&card->files_lock); | |
543 | } | |
544 | EXPORT_SYMBOL_GPL(snd_card_disconnect_sync); | |
545 | ||
c461482c | 546 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 547 | { |
e8ad415b | 548 | card->releasing = true; |
8eeaa2f9 | 549 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
550 | if (snd_mixer_oss_notify_callback) |
551 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
552 | #endif | |
72620d60 | 553 | snd_device_free_all(card); |
1da177e4 LT |
554 | if (card->private_free) |
555 | card->private_free(card); | |
1da177e4 | 556 | if (snd_info_card_free(card) < 0) { |
f2f9307a | 557 | dev_warn(card->dev, "unable to free card info\n"); |
1da177e4 LT |
558 | /* Not fatal error */ |
559 | } | |
3c4ab49e TI |
560 | #ifdef CONFIG_SND_DEBUG |
561 | debugfs_remove(card->debugfs_root); | |
562 | card->debugfs_root = NULL; | |
563 | #endif | |
f2464064 TI |
564 | if (card->release_completion) |
565 | complete(card->release_completion); | |
e8ad415b TI |
566 | if (!card->managed) |
567 | kfree(card); | |
c461482c TI |
568 | return 0; |
569 | } | |
570 | ||
eb9c38d5 TI |
571 | /** |
572 | * snd_card_free_when_closed - Disconnect the card, free it later eventually | |
573 | * @card: soundcard structure | |
574 | * | |
575 | * Unlike snd_card_free(), this function doesn't try to release the card | |
576 | * resource immediately, but tries to disconnect at first. When the card | |
577 | * is still in use, the function returns before freeing the resources. | |
578 | * The card resources will be freed when the refcount gets to zero. | |
579 | */ | |
c461482c TI |
580 | int snd_card_free_when_closed(struct snd_card *card) |
581 | { | |
f2464064 TI |
582 | int ret = snd_card_disconnect(card); |
583 | if (ret) | |
a0830dbd | 584 | return ret; |
f2464064 | 585 | put_device(&card->card_dev); |
c461482c TI |
586 | return 0; |
587 | } | |
c461482c TI |
588 | EXPORT_SYMBOL(snd_card_free_when_closed); |
589 | ||
eb9c38d5 TI |
590 | /** |
591 | * snd_card_free - frees given soundcard structure | |
592 | * @card: soundcard structure | |
593 | * | |
594 | * This function releases the soundcard structure and the all assigned | |
595 | * devices automatically. That is, you don't have to release the devices | |
596 | * by yourself. | |
597 | * | |
598 | * This function waits until the all resources are properly released. | |
599 | * | |
600 | * Return: Zero. Frees all associated devices and frees the control | |
601 | * interface associated to given soundcard. | |
602 | */ | |
c461482c TI |
603 | int snd_card_free(struct snd_card *card) |
604 | { | |
bec206db | 605 | DECLARE_COMPLETION_ONSTACK(released); |
f2464064 TI |
606 | int ret; |
607 | ||
825a5248 TI |
608 | /* The call of snd_card_free() is allowed from various code paths; |
609 | * a manual call from the driver and the call via devres_free, and | |
610 | * we need to avoid double-free. Moreover, the release via devres | |
611 | * may call snd_card_free() twice due to its nature, we need to have | |
612 | * the check here at the beginning. | |
613 | */ | |
614 | if (card->releasing) | |
615 | return 0; | |
616 | ||
f2464064 TI |
617 | card->release_completion = &released; |
618 | ret = snd_card_free_when_closed(card); | |
c461482c TI |
619 | if (ret) |
620 | return ret; | |
c461482c | 621 | /* wait, until all devices are ready for the free operation */ |
f2464064 | 622 | wait_for_completion(&released); |
2d670ea2 | 623 | |
1da177e4 LT |
624 | return 0; |
625 | } | |
c0d3fb39 TI |
626 | EXPORT_SYMBOL(snd_card_free); |
627 | ||
e7df2a3a TI |
628 | /* retrieve the last word of shortname or longname */ |
629 | static const char *retrieve_id_from_card_name(const char *name) | |
1da177e4 | 630 | { |
e7df2a3a TI |
631 | const char *spos = name; |
632 | ||
633 | while (*name) { | |
634 | if (isspace(*name) && isalnum(name[1])) | |
635 | spos = name + 1; | |
636 | name++; | |
1da177e4 | 637 | } |
e7df2a3a TI |
638 | return spos; |
639 | } | |
640 | ||
641 | /* return true if the given id string doesn't conflict any other card ids */ | |
642 | static bool card_id_ok(struct snd_card *card, const char *id) | |
643 | { | |
644 | int i; | |
645 | if (!snd_info_check_reserved_words(id)) | |
646 | return false; | |
647 | for (i = 0; i < snd_ecards_limit; i++) { | |
648 | if (snd_cards[i] && snd_cards[i] != card && | |
649 | !strcmp(snd_cards[i]->id, id)) | |
650 | return false; | |
1da177e4 | 651 | } |
e7df2a3a TI |
652 | return true; |
653 | } | |
1da177e4 | 654 | |
e7df2a3a TI |
655 | /* copy to card->id only with valid letters from nid */ |
656 | static void copy_valid_id_string(struct snd_card *card, const char *src, | |
657 | const char *nid) | |
658 | { | |
659 | char *id = card->id; | |
660 | ||
661 | while (*nid && !isalnum(*nid)) | |
662 | nid++; | |
663 | if (isdigit(*nid)) | |
664 | *id++ = isalpha(*src) ? *src : 'D'; | |
665 | while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
666 | if (isalnum(*nid)) | |
667 | *id++ = *nid; | |
668 | nid++; | |
669 | } | |
670 | *id = 0; | |
671 | } | |
672 | ||
673 | /* Set card->id from the given string | |
674 | * If the string conflicts with other ids, add a suffix to make it unique. | |
675 | */ | |
676 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *src, | |
677 | const char *nid) | |
678 | { | |
679 | int len, loops; | |
e7df2a3a TI |
680 | bool is_default = false; |
681 | char *id; | |
1da177e4 | 682 | |
e7df2a3a TI |
683 | copy_valid_id_string(card, src, nid); |
684 | id = card->id; | |
685 | ||
686 | again: | |
687 | /* use "Default" for obviously invalid strings | |
688 | * ("card" conflicts with proc directories) | |
689 | */ | |
690 | if (!*id || !strncmp(id, "card", 4)) { | |
d8e4f9ae | 691 | strcpy(id, "Default"); |
e7df2a3a TI |
692 | is_default = true; |
693 | } | |
1da177e4 | 694 | |
8edbb198 | 695 | len = strlen(id); |
e7df2a3a | 696 | for (loops = 0; loops < SNDRV_CARDS; loops++) { |
8edbb198 TI |
697 | char *spos; |
698 | char sfxstr[5]; /* "_012" */ | |
699 | int sfxlen; | |
700 | ||
e7df2a3a TI |
701 | if (card_id_ok(card, id)) |
702 | return; /* OK */ | |
1da177e4 | 703 | |
8edbb198 TI |
704 | /* Add _XYZ suffix */ |
705 | sprintf(sfxstr, "_%X", loops + 1); | |
706 | sfxlen = strlen(sfxstr); | |
707 | if (len + sfxlen >= sizeof(card->id)) | |
708 | spos = id + sizeof(card->id) - sfxlen - 1; | |
709 | else | |
710 | spos = id + len; | |
711 | strcpy(spos, sfxstr); | |
1da177e4 | 712 | } |
e7df2a3a TI |
713 | /* fallback to the default id */ |
714 | if (!is_default) { | |
715 | *id = 0; | |
716 | goto again; | |
717 | } | |
718 | /* last resort... */ | |
f2f9307a | 719 | dev_err(card->dev, "unable to set card id (%s)\n", id); |
e7df2a3a | 720 | if (card->proc_root->name) |
75b1a8f9 | 721 | strscpy(card->id, card->proc_root->name, sizeof(card->id)); |
1da177e4 LT |
722 | } |
723 | ||
872c7820 MB |
724 | /** |
725 | * snd_card_set_id - set card identification name | |
726 | * @card: soundcard structure | |
727 | * @nid: new identification string | |
728 | * | |
729 | * This function sets the card identification and checks for name | |
730 | * collisions. | |
731 | */ | |
732 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
733 | { | |
5fdc18d9 JK |
734 | /* check if user specified own card->id */ |
735 | if (card->id[0] != '\0') | |
736 | return; | |
737 | mutex_lock(&snd_card_mutex); | |
e7df2a3a | 738 | snd_card_set_id_no_lock(card, nid, nid); |
5fdc18d9 | 739 | mutex_unlock(&snd_card_mutex); |
872c7820 | 740 | } |
10a8ebbb JK |
741 | EXPORT_SYMBOL(snd_card_set_id); |
742 | ||
873fd813 Y |
743 | static ssize_t id_show(struct device *dev, |
744 | struct device_attribute *attr, char *buf) | |
9fb6198e | 745 | { |
b203dbab | 746 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
ef21e175 | 747 | return scnprintf(buf, PAGE_SIZE, "%s\n", card->id); |
9fb6198e JK |
748 | } |
749 | ||
873fd813 Y |
750 | static ssize_t id_store(struct device *dev, struct device_attribute *attr, |
751 | const char *buf, size_t count) | |
9fb6198e | 752 | { |
b203dbab | 753 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
9fb6198e JK |
754 | char buf1[sizeof(card->id)]; |
755 | size_t copy = count > sizeof(card->id) - 1 ? | |
756 | sizeof(card->id) - 1 : count; | |
757 | size_t idx; | |
758 | int c; | |
759 | ||
760 | for (idx = 0; idx < copy; idx++) { | |
761 | c = buf[idx]; | |
762 | if (!isalnum(c) && c != '_' && c != '-') | |
763 | return -EINVAL; | |
764 | } | |
765 | memcpy(buf1, buf, copy); | |
766 | buf1[copy] = '\0'; | |
767 | mutex_lock(&snd_card_mutex); | |
e7df2a3a | 768 | if (!card_id_ok(NULL, buf1)) { |
9fb6198e JK |
769 | mutex_unlock(&snd_card_mutex); |
770 | return -EEXIST; | |
771 | } | |
9fb6198e | 772 | strcpy(card->id, buf1); |
c2eb9c4e | 773 | snd_info_card_id_change(card); |
9fb6198e JK |
774 | mutex_unlock(&snd_card_mutex); |
775 | ||
776 | return count; | |
777 | } | |
778 | ||
873fd813 | 779 | static DEVICE_ATTR_RW(id); |
9fb6198e | 780 | |
873fd813 Y |
781 | static ssize_t number_show(struct device *dev, |
782 | struct device_attribute *attr, char *buf) | |
9fb6198e | 783 | { |
b203dbab | 784 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
ef21e175 | 785 | return scnprintf(buf, PAGE_SIZE, "%i\n", card->number); |
9fb6198e JK |
786 | } |
787 | ||
873fd813 | 788 | static DEVICE_ATTR_RO(number); |
34356dbd TI |
789 | |
790 | static struct attribute *card_dev_attrs[] = { | |
791 | &dev_attr_id.attr, | |
792 | &dev_attr_number.attr, | |
793 | NULL | |
794 | }; | |
795 | ||
6bbc7fed | 796 | static const struct attribute_group card_dev_attr_group = { |
34356dbd TI |
797 | .attrs = card_dev_attrs, |
798 | }; | |
799 | ||
6bbc7fed TI |
800 | /** |
801 | * snd_card_add_dev_attr - Append a new sysfs attribute group to card | |
802 | * @card: card instance | |
803 | * @group: attribute group to append | |
804 | */ | |
805 | int snd_card_add_dev_attr(struct snd_card *card, | |
806 | const struct attribute_group *group) | |
807 | { | |
808 | int i; | |
809 | ||
810 | /* loop for (arraysize-1) here to keep NULL at the last entry */ | |
811 | for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) { | |
812 | if (!card->dev_groups[i]) { | |
813 | card->dev_groups[i] = group; | |
814 | return 0; | |
815 | } | |
816 | } | |
817 | ||
818 | dev_err(card->dev, "Too many groups assigned\n"); | |
819 | return -ENOSPC; | |
35f80014 | 820 | } |
6bbc7fed | 821 | EXPORT_SYMBOL_GPL(snd_card_add_dev_attr); |
9fb6198e | 822 | |
e8ad415b TI |
823 | static void trigger_card_free(void *data) |
824 | { | |
825a5248 | 825 | snd_card_free(data); |
e8ad415b TI |
826 | } |
827 | ||
1da177e4 LT |
828 | /** |
829 | * snd_card_register - register the soundcard | |
830 | * @card: soundcard structure | |
831 | * | |
832 | * This function registers all the devices assigned to the soundcard. | |
833 | * Until calling this, the ALSA control interface is blocked from the | |
834 | * external accesses. Thus, you should call this function at the end | |
835 | * of the initialization of the card. | |
836 | * | |
eb7c06e8 | 837 | * Return: Zero otherwise a negative error code if the registration failed. |
1da177e4 | 838 | */ |
512bbd6a | 839 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
840 | { |
841 | int err; | |
1da177e4 | 842 | |
7eaa943c TI |
843 | if (snd_BUG_ON(!card)) |
844 | return -EINVAL; | |
39aba963 | 845 | |
8bfb181c TI |
846 | if (!card->registered) { |
847 | err = device_add(&card->card_dev); | |
848 | if (err < 0) | |
849 | return err; | |
850 | card->registered = true; | |
e8ad415b TI |
851 | } else { |
852 | if (card->managed) | |
853 | devm_remove_action(card->dev, trigger_card_free, card); | |
854 | } | |
855 | ||
856 | if (card->managed) { | |
857 | err = devm_add_action(card->dev, trigger_card_free, card); | |
858 | if (err < 0) | |
859 | return err; | |
d80f19fa | 860 | } |
39aba963 | 861 | |
e3ded899 TI |
862 | err = snd_device_register_all(card); |
863 | if (err < 0) | |
1da177e4 | 864 | return err; |
746df948 | 865 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
866 | if (snd_cards[card->number]) { |
867 | /* already registered */ | |
746df948 | 868 | mutex_unlock(&snd_card_mutex); |
2471b6c8 | 869 | return snd_info_card_register(card); /* register pending info */ |
1da177e4 | 870 | } |
e7df2a3a TI |
871 | if (*card->id) { |
872 | /* make a unique id name from the given string */ | |
873 | char tmpid[sizeof(card->id)]; | |
874 | memcpy(tmpid, card->id, sizeof(card->id)); | |
875 | snd_card_set_id_no_lock(card, tmpid, tmpid); | |
876 | } else { | |
877 | /* create an id from either shortname or longname */ | |
878 | const char *src; | |
879 | src = *card->shortname ? card->shortname : card->longname; | |
880 | snd_card_set_id_no_lock(card, src, | |
881 | retrieve_id_from_card_name(src)); | |
882 | } | |
1da177e4 | 883 | snd_cards[card->number] = card; |
746df948 | 884 | mutex_unlock(&snd_card_mutex); |
29b2625f TI |
885 | err = snd_info_card_register(card); |
886 | if (err < 0) | |
887 | return err; | |
888 | ||
8eeaa2f9 | 889 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
890 | if (snd_mixer_oss_notify_callback) |
891 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e | 892 | #endif |
1da177e4 LT |
893 | return 0; |
894 | } | |
c0d3fb39 TI |
895 | EXPORT_SYMBOL(snd_card_register); |
896 | ||
cd6a6503 | 897 | #ifdef CONFIG_SND_PROC_FS |
a381a7a6 TI |
898 | static void snd_card_info_read(struct snd_info_entry *entry, |
899 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
900 | { |
901 | int idx, count; | |
512bbd6a | 902 | struct snd_card *card; |
1da177e4 LT |
903 | |
904 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 905 | mutex_lock(&snd_card_mutex); |
e3ded899 TI |
906 | card = snd_cards[idx]; |
907 | if (card) { | |
1da177e4 | 908 | count++; |
d001544d | 909 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
910 | idx, |
911 | card->id, | |
912 | card->driver, | |
913 | card->shortname); | |
d001544d | 914 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
915 | card->longname); |
916 | } | |
746df948 | 917 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
918 | } |
919 | if (!count) | |
920 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
921 | } | |
922 | ||
e28563cc | 923 | #ifdef CONFIG_SND_OSSEMUL |
512bbd6a | 924 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
925 | { |
926 | int idx, count; | |
512bbd6a | 927 | struct snd_card *card; |
1da177e4 LT |
928 | |
929 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 930 | mutex_lock(&snd_card_mutex); |
e3ded899 TI |
931 | card = snd_cards[idx]; |
932 | if (card) { | |
1da177e4 LT |
933 | count++; |
934 | snd_iprintf(buffer, "%s\n", card->longname); | |
935 | } | |
746df948 | 936 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
937 | } |
938 | if (!count) { | |
939 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
940 | } | |
941 | } | |
942 | ||
943 | #endif | |
944 | ||
945 | #ifdef MODULE | |
512bbd6a TI |
946 | static void snd_card_module_info_read(struct snd_info_entry *entry, |
947 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
948 | { |
949 | int idx; | |
512bbd6a | 950 | struct snd_card *card; |
1da177e4 LT |
951 | |
952 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 953 | mutex_lock(&snd_card_mutex); |
e3ded899 TI |
954 | card = snd_cards[idx]; |
955 | if (card) | |
d001544d CL |
956 | snd_iprintf(buffer, "%2i %s\n", |
957 | idx, card->module->name); | |
746df948 | 958 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
959 | } |
960 | } | |
961 | #endif | |
962 | ||
963 | int __init snd_card_info_init(void) | |
964 | { | |
512bbd6a | 965 | struct snd_info_entry *entry; |
1da177e4 LT |
966 | |
967 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
968 | if (! entry) |
969 | return -ENOMEM; | |
1da177e4 | 970 | entry->c.text.read = snd_card_info_read; |
b591b6e9 TI |
971 | if (snd_info_register(entry) < 0) |
972 | return -ENOMEM; /* freed in error path */ | |
1da177e4 LT |
973 | |
974 | #ifdef MODULE | |
975 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
b591b6e9 TI |
976 | if (!entry) |
977 | return -ENOMEM; | |
978 | entry->c.text.read = snd_card_module_info_read; | |
979 | if (snd_info_register(entry) < 0) | |
980 | return -ENOMEM; /* freed in error path */ | |
1da177e4 LT |
981 | #endif |
982 | ||
983 | return 0; | |
984 | } | |
cd6a6503 | 985 | #endif /* CONFIG_SND_PROC_FS */ |
e28563cc | 986 | |
1da177e4 LT |
987 | /** |
988 | * snd_component_add - add a component string | |
989 | * @card: soundcard structure | |
990 | * @component: the component id string | |
991 | * | |
992 | * This function adds the component id string to the supported list. | |
993 | * The component can be referred from the alsa-lib. | |
994 | * | |
eb7c06e8 | 995 | * Return: Zero otherwise a negative error code. |
1da177e4 LT |
996 | */ |
997 | ||
512bbd6a | 998 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
999 | { |
1000 | char *ptr; | |
1001 | int len = strlen(component); | |
1002 | ||
1003 | ptr = strstr(card->components, component); | |
1004 | if (ptr != NULL) { | |
1005 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
1006 | return 1; | |
1007 | } | |
1008 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
1009 | snd_BUG(); | |
1010 | return -ENOMEM; | |
1011 | } | |
1012 | if (card->components[0] != '\0') | |
1013 | strcat(card->components, " "); | |
1014 | strcat(card->components, component); | |
1015 | return 0; | |
1016 | } | |
c0d3fb39 TI |
1017 | EXPORT_SYMBOL(snd_component_add); |
1018 | ||
1da177e4 LT |
1019 | /** |
1020 | * snd_card_file_add - add the file to the file list of the card | |
1021 | * @card: soundcard structure | |
1022 | * @file: file pointer | |
1023 | * | |
1024 | * This function adds the file to the file linked-list of the card. | |
1025 | * This linked-list is used to keep tracking the connection state, | |
1026 | * and to avoid the release of busy resources by hotplug. | |
1027 | * | |
eb7c06e8 | 1028 | * Return: zero or a negative error code. |
1da177e4 | 1029 | */ |
512bbd6a | 1030 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
1031 | { |
1032 | struct snd_monitor_file *mfile; | |
1033 | ||
1034 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
1035 | if (mfile == NULL) | |
1036 | return -ENOMEM; | |
1037 | mfile->file = file; | |
a9edfc60 | 1038 | mfile->disconnected_f_op = NULL; |
a45e3d6b | 1039 | INIT_LIST_HEAD(&mfile->shutdown_list); |
1da177e4 LT |
1040 | spin_lock(&card->files_lock); |
1041 | if (card->shutdown) { | |
1042 | spin_unlock(&card->files_lock); | |
1043 | kfree(mfile); | |
1044 | return -ENODEV; | |
1045 | } | |
118dd6bf | 1046 | list_add(&mfile->list, &card->files_list); |
f2464064 | 1047 | get_device(&card->card_dev); |
1da177e4 LT |
1048 | spin_unlock(&card->files_lock); |
1049 | return 0; | |
1050 | } | |
c0d3fb39 TI |
1051 | EXPORT_SYMBOL(snd_card_file_add); |
1052 | ||
1da177e4 LT |
1053 | /** |
1054 | * snd_card_file_remove - remove the file from the file list | |
1055 | * @card: soundcard structure | |
1056 | * @file: file pointer | |
1057 | * | |
1058 | * This function removes the file formerly added to the card via | |
1059 | * snd_card_file_add() function. | |
2b29b13c TI |
1060 | * If all files are removed and snd_card_free_when_closed() was |
1061 | * called beforehand, it processes the pending release of | |
1062 | * resources. | |
1da177e4 | 1063 | * |
eb7c06e8 | 1064 | * Return: Zero or a negative error code. |
1da177e4 | 1065 | */ |
512bbd6a | 1066 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 1067 | { |
118dd6bf | 1068 | struct snd_monitor_file *mfile, *found = NULL; |
1da177e4 LT |
1069 | |
1070 | spin_lock(&card->files_lock); | |
118dd6bf | 1071 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 1072 | if (mfile->file == file) { |
118dd6bf | 1073 | list_del(&mfile->list); |
a45e3d6b TI |
1074 | spin_lock(&shutdown_lock); |
1075 | list_del(&mfile->shutdown_list); | |
1076 | spin_unlock(&shutdown_lock); | |
118dd6bf TI |
1077 | if (mfile->disconnected_f_op) |
1078 | fops_put(mfile->disconnected_f_op); | |
1079 | found = mfile; | |
1da177e4 LT |
1080 | break; |
1081 | } | |
a9edfc60 | 1082 | } |
c44027c8 TI |
1083 | if (list_empty(&card->files_list)) |
1084 | wake_up_all(&card->remove_sleep); | |
c461482c | 1085 | spin_unlock(&card->files_lock); |
118dd6bf | 1086 | if (!found) { |
f2f9307a | 1087 | dev_err(card->dev, "card file remove problem (%p)\n", file); |
1da177e4 LT |
1088 | return -ENOENT; |
1089 | } | |
118dd6bf | 1090 | kfree(found); |
f2464064 | 1091 | put_device(&card->card_dev); |
1da177e4 LT |
1092 | return 0; |
1093 | } | |
c0d3fb39 TI |
1094 | EXPORT_SYMBOL(snd_card_file_remove); |
1095 | ||
1da177e4 LT |
1096 | #ifdef CONFIG_PM |
1097 | /** | |
e94fdbd7 TI |
1098 | * snd_power_ref_and_wait - wait until the card gets powered up |
1099 | * @card: soundcard structure | |
1da177e4 | 1100 | * |
e94fdbd7 TI |
1101 | * Take the power_ref reference count of the given card, and |
1102 | * wait until the card gets powered up to SNDRV_CTL_POWER_D0 state. | |
1103 | * The refcount is down again while sleeping until power-up, hence this | |
1104 | * function can be used for syncing the floating control ops accesses, | |
1105 | * typically around calling control ops. | |
1da177e4 | 1106 | * |
e94fdbd7 TI |
1107 | * The caller needs to pull down the refcount via snd_power_unref() later |
1108 | * no matter whether the error is returned from this function or not. | |
1109 | * | |
1110 | * Return: Zero if successful, or a negative error code. | |
1da177e4 | 1111 | */ |
e94fdbd7 | 1112 | int snd_power_ref_and_wait(struct snd_card *card) |
1da177e4 | 1113 | { |
ac6424b9 | 1114 | wait_queue_entry_t wait; |
1da177e4 LT |
1115 | int result = 0; |
1116 | ||
e94fdbd7 | 1117 | snd_power_ref(card); |
1da177e4 | 1118 | /* fastpath */ |
e94fdbd7 | 1119 | if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) |
1da177e4 LT |
1120 | return 0; |
1121 | init_waitqueue_entry(&wait, current); | |
1122 | add_wait_queue(&card->power_sleep, &wait); | |
1123 | while (1) { | |
1124 | if (card->shutdown) { | |
1125 | result = -ENODEV; | |
1126 | break; | |
1127 | } | |
e94fdbd7 | 1128 | if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) |
1da177e4 | 1129 | break; |
e94fdbd7 | 1130 | snd_power_unref(card); |
1da177e4 | 1131 | set_current_state(TASK_UNINTERRUPTIBLE); |
1da177e4 | 1132 | schedule_timeout(30 * HZ); |
e94fdbd7 | 1133 | snd_power_ref(card); |
1da177e4 LT |
1134 | } |
1135 | remove_wait_queue(&card->power_sleep, &wait); | |
1136 | return result; | |
1137 | } | |
e94fdbd7 TI |
1138 | EXPORT_SYMBOL_GPL(snd_power_ref_and_wait); |
1139 | ||
1140 | /** | |
1141 | * snd_power_wait - wait until the card gets powered up (old form) | |
1142 | * @card: soundcard structure | |
e94fdbd7 TI |
1143 | * |
1144 | * Wait until the card gets powered up to SNDRV_CTL_POWER_D0 state. | |
e94fdbd7 TI |
1145 | * |
1146 | * Return: Zero if successful, or a negative error code. | |
1147 | */ | |
b6cc78da | 1148 | int snd_power_wait(struct snd_card *card) |
e94fdbd7 TI |
1149 | { |
1150 | int ret; | |
1151 | ||
e94fdbd7 TI |
1152 | ret = snd_power_ref_and_wait(card); |
1153 | snd_power_unref(card); | |
1154 | return ret; | |
1155 | } | |
c0d3fb39 | 1156 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 1157 | #endif /* CONFIG_PM */ |