Commit | Line | Data |
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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; |
c1a8d5f3 | 53 | #ifdef CONFIG_MODULES |
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 | } | |
c1a8d5f3 | 80 | #endif /* CONFIG_MODULES */ |
a93bbaa7 | 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 | ||
7f018db1 TI |
114 | /* the default release callback set in snd_device_alloc() */ |
115 | static void default_release_alloc(struct device *dev) | |
116 | { | |
117 | kfree(dev); | |
118 | } | |
119 | ||
120 | /** | |
121 | * snd_device_alloc - Allocate and initialize struct device for sound devices | |
122 | * @dev_p: pointer to store the allocated device | |
123 | * @card: card to assign, optional | |
124 | * | |
125 | * For releasing the allocated device, call put_device(). | |
126 | */ | |
127 | int snd_device_alloc(struct device **dev_p, struct snd_card *card) | |
128 | { | |
129 | struct device *dev; | |
130 | ||
131 | *dev_p = NULL; | |
132 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
133 | if (!dev) | |
134 | return -ENOMEM; | |
135 | device_initialize(dev); | |
136 | if (card) | |
137 | dev->parent = &card->card_dev; | |
138 | dev->class = &sound_class; | |
139 | dev->release = default_release_alloc; | |
140 | *dev_p = dev; | |
141 | return 0; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(snd_device_alloc); | |
144 | ||
e8ad415b TI |
145 | static int snd_card_init(struct snd_card *card, struct device *parent, |
146 | int idx, const char *xid, struct module *module, | |
147 | size_t extra_size); | |
8bfb181c | 148 | static int snd_card_do_free(struct snd_card *card); |
6bbc7fed | 149 | static const struct attribute_group card_dev_attr_group; |
8bfb181c TI |
150 | |
151 | static void release_card_device(struct device *dev) | |
152 | { | |
153 | snd_card_do_free(dev_to_snd_card(dev)); | |
154 | } | |
155 | ||
1da177e4 | 156 | /** |
393aa9c1 TI |
157 | * snd_card_new - create and initialize a soundcard structure |
158 | * @parent: the parent device object | |
1da177e4 LT |
159 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
160 | * @xid: card identification (ASCII string) | |
161 | * @module: top level module for locking | |
162 | * @extra_size: allocate this extra size after the main soundcard structure | |
53fb1e63 | 163 | * @card_ret: the pointer to store the created card instance |
1da177e4 | 164 | * |
53fb1e63 TI |
165 | * The function allocates snd_card instance via kzalloc with the given |
166 | * space for the driver to use freely. The allocated struct is stored | |
167 | * in the given card_ret pointer. | |
168 | * | |
eb7c06e8 | 169 | * Return: Zero if successful or a negative error code. |
1da177e4 | 170 | */ |
393aa9c1 | 171 | int snd_card_new(struct device *parent, int idx, const char *xid, |
53fb1e63 TI |
172 | struct module *module, int extra_size, |
173 | struct snd_card **card_ret) | |
1da177e4 | 174 | { |
512bbd6a | 175 | struct snd_card *card; |
deb6596f | 176 | int err; |
1da177e4 | 177 | |
53fb1e63 TI |
178 | if (snd_BUG_ON(!card_ret)) |
179 | return -EINVAL; | |
180 | *card_ret = NULL; | |
181 | ||
1da177e4 LT |
182 | if (extra_size < 0) |
183 | extra_size = 0; | |
ca2c0966 | 184 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
185 | if (!card) |
186 | return -ENOMEM; | |
e8ad415b TI |
187 | |
188 | err = snd_card_init(card, parent, idx, xid, module, extra_size); | |
c3afa2a4 TI |
189 | if (err < 0) |
190 | return err; /* card is freed by error handler */ | |
e8ad415b TI |
191 | |
192 | *card_ret = card; | |
193 | return 0; | |
194 | } | |
195 | EXPORT_SYMBOL(snd_card_new); | |
196 | ||
197 | static void __snd_card_release(struct device *dev, void *data) | |
198 | { | |
199 | snd_card_free(data); | |
200 | } | |
201 | ||
202 | /** | |
203 | * snd_devm_card_new - managed snd_card object creation | |
204 | * @parent: the parent device object | |
205 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
206 | * @xid: card identification (ASCII string) | |
207 | * @module: top level module for locking | |
208 | * @extra_size: allocate this extra size after the main soundcard structure | |
209 | * @card_ret: the pointer to store the created card instance | |
210 | * | |
211 | * This function works like snd_card_new() but manages the allocated resource | |
212 | * via devres, i.e. you don't need to free explicitly. | |
213 | * | |
214 | * When a snd_card object is created with this function and registered via | |
215 | * snd_card_register(), the very first devres action to call snd_card_free() | |
216 | * is added automatically. In that way, the resource disconnection is assured | |
217 | * at first, then released in the expected order. | |
fee2b871 TI |
218 | * |
219 | * If an error happens at the probe before snd_card_register() is called and | |
220 | * there have been other devres resources, you'd need to free the card manually | |
221 | * via snd_card_free() call in the error; otherwise it may lead to UAF due to | |
222 | * devres call orders. You can use snd_card_free_on_error() helper for | |
223 | * handling it more easily. | |
281dee67 TI |
224 | * |
225 | * Return: zero if successful, or a negative error code | |
e8ad415b TI |
226 | */ |
227 | int snd_devm_card_new(struct device *parent, int idx, const char *xid, | |
228 | struct module *module, size_t extra_size, | |
229 | struct snd_card **card_ret) | |
230 | { | |
231 | struct snd_card *card; | |
232 | int err; | |
233 | ||
234 | *card_ret = NULL; | |
235 | card = devres_alloc(__snd_card_release, sizeof(*card) + extra_size, | |
236 | GFP_KERNEL); | |
237 | if (!card) | |
238 | return -ENOMEM; | |
239 | card->managed = true; | |
240 | err = snd_card_init(card, parent, idx, xid, module, extra_size); | |
241 | if (err < 0) { | |
c3afa2a4 | 242 | devres_free(card); /* in managed mode, we need to free manually */ |
e8ad415b TI |
243 | return err; |
244 | } | |
245 | ||
246 | devres_add(parent, card); | |
247 | *card_ret = card; | |
248 | return 0; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(snd_devm_card_new); | |
251 | ||
fee2b871 TI |
252 | /** |
253 | * snd_card_free_on_error - a small helper for handling devm probe errors | |
254 | * @dev: the managed device object | |
255 | * @ret: the return code from the probe callback | |
256 | * | |
257 | * This function handles the explicit snd_card_free() call at the error from | |
258 | * the probe callback. It's just a small helper for simplifying the error | |
259 | * handling with the managed devices. | |
281dee67 TI |
260 | * |
261 | * Return: zero if successful, or a negative error code | |
fee2b871 TI |
262 | */ |
263 | int snd_card_free_on_error(struct device *dev, int ret) | |
264 | { | |
265 | struct snd_card *card; | |
266 | ||
267 | if (!ret) | |
268 | return 0; | |
269 | card = devres_find(dev, __snd_card_release, NULL, NULL); | |
270 | if (card) | |
271 | snd_card_free(card); | |
272 | return ret; | |
273 | } | |
274 | EXPORT_SYMBOL_GPL(snd_card_free_on_error); | |
275 | ||
e8ad415b TI |
276 | static int snd_card_init(struct snd_card *card, struct device *parent, |
277 | int idx, const char *xid, struct module *module, | |
278 | size_t extra_size) | |
279 | { | |
280 | int err; | |
e8ad415b | 281 | |
8bfb181c TI |
282 | if (extra_size > 0) |
283 | card->private_data = (char *)card + sizeof(struct snd_card); | |
10a8ebbb | 284 | if (xid) |
75b1a8f9 | 285 | strscpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 286 | err = 0; |
742ecf3c TI |
287 | scoped_guard(mutex, &snd_card_mutex) { |
288 | if (idx < 0) /* first check the matching module-name slot */ | |
289 | idx = get_slot_from_bitmask(idx, module_slot_match, module); | |
290 | if (idx < 0) /* if not matched, assign an empty slot */ | |
291 | idx = get_slot_from_bitmask(idx, check_empty_slot, module); | |
292 | if (idx < 0) | |
293 | err = -ENODEV; | |
294 | else if (idx < snd_ecards_limit) { | |
295 | if (test_bit(idx, snd_cards_lock)) | |
296 | err = -EBUSY; /* invalid */ | |
297 | } else if (idx >= SNDRV_CARDS) | |
298 | err = -ENODEV; | |
299 | if (!err) { | |
300 | set_bit(idx, snd_cards_lock); /* lock it */ | |
301 | if (idx >= snd_ecards_limit) | |
302 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
303 | } | |
304 | } | |
a93bbaa7 | 305 | if (err < 0) { |
f2f9307a | 306 | dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n", |
742ecf3c | 307 | idx, snd_ecards_limit - 1, err); |
c3afa2a4 TI |
308 | if (!card->managed) |
309 | kfree(card); /* manually free here, as no destructor called */ | |
8bfb181c | 310 | return err; |
1da177e4 | 311 | } |
393aa9c1 | 312 | card->dev = parent; |
1da177e4 | 313 | card->number = idx; |
c1a8d5f3 | 314 | WARN_ON(IS_MODULE(CONFIG_SND) && !module); |
39381fe7 | 315 | card->module = module; |
1da177e4 LT |
316 | INIT_LIST_HEAD(&card->devices); |
317 | init_rwsem(&card->controls_rwsem); | |
f428cc9e | 318 | rwlock_init(&card->controls_rwlock); |
1da177e4 LT |
319 | INIT_LIST_HEAD(&card->controls); |
320 | INIT_LIST_HEAD(&card->ctl_files); | |
c27e1efb TI |
321 | #ifdef CONFIG_SND_CTL_FAST_LOOKUP |
322 | xa_init(&card->ctl_numids); | |
323 | xa_init(&card->ctl_hash); | |
324 | #endif | |
1da177e4 | 325 | spin_lock_init(&card->files_lock); |
118dd6bf | 326 | INIT_LIST_HEAD(&card->files_list); |
d4cfb30f | 327 | mutex_init(&card->memory_mutex); |
1da177e4 | 328 | #ifdef CONFIG_PM |
1da177e4 | 329 | init_waitqueue_head(&card->power_sleep); |
e94fdbd7 TI |
330 | init_waitqueue_head(&card->power_ref_sleep); |
331 | atomic_set(&card->power_ref, 0); | |
1da177e4 | 332 | #endif |
c44027c8 | 333 | init_waitqueue_head(&card->remove_sleep); |
fabb26dc | 334 | card->sync_irq = -1; |
8bfb181c TI |
335 | |
336 | device_initialize(&card->card_dev); | |
337 | card->card_dev.parent = parent; | |
8d0cf150 | 338 | card->card_dev.class = &sound_class; |
8bfb181c | 339 | card->card_dev.release = release_card_device; |
6bbc7fed TI |
340 | card->card_dev.groups = card->dev_groups; |
341 | card->dev_groups[0] = &card_dev_attr_group; | |
8bfb181c TI |
342 | err = kobject_set_name(&card->card_dev.kobj, "card%d", idx); |
343 | if (err < 0) | |
344 | goto __error; | |
345 | ||
de65360b HK |
346 | snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s", |
347 | dev_driver_string(card->dev), dev_name(&card->card_dev)); | |
348 | ||
1da177e4 LT |
349 | /* the control interface cannot be accessed from the user space until */ |
350 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
351 | err = snd_ctl_create(card); |
352 | if (err < 0) { | |
f2f9307a | 353 | dev_err(parent, "unable to register control minors\n"); |
1da177e4 LT |
354 | goto __error; |
355 | } | |
53fb1e63 TI |
356 | err = snd_info_card_create(card); |
357 | if (err < 0) { | |
f2f9307a | 358 | dev_err(parent, "unable to create card info\n"); |
1da177e4 LT |
359 | goto __error_ctl; |
360 | } | |
2d670ea2 HW |
361 | |
362 | #ifdef CONFIG_SND_DEBUG | |
091c2848 PU |
363 | card->debugfs_root = debugfs_create_dir(dev_name(&card->card_dev), |
364 | sound_debugfs_root); | |
2d670ea2 | 365 | #endif |
53fb1e63 | 366 | return 0; |
1da177e4 LT |
367 | |
368 | __error_ctl: | |
289ca025 | 369 | snd_device_free_all(card); |
1da177e4 | 370 | __error: |
8bfb181c | 371 | put_device(&card->card_dev); |
53fb1e63 | 372 | return err; |
1da177e4 | 373 | } |
c0d3fb39 | 374 | |
f4fa9689 TI |
375 | /** |
376 | * snd_card_ref - Get the card object from the index | |
377 | * @idx: the card index | |
378 | * | |
379 | * Returns a card object corresponding to the given index or NULL if not found. | |
380 | * Release the object via snd_card_unref(). | |
281dee67 TI |
381 | * |
382 | * Return: a card object or NULL | |
f4fa9689 TI |
383 | */ |
384 | struct snd_card *snd_card_ref(int idx) | |
385 | { | |
386 | struct snd_card *card; | |
387 | ||
742ecf3c | 388 | guard(mutex)(&snd_card_mutex); |
f4fa9689 TI |
389 | card = snd_cards[idx]; |
390 | if (card) | |
391 | get_device(&card->card_dev); | |
f4fa9689 TI |
392 | return card; |
393 | } | |
394 | EXPORT_SYMBOL_GPL(snd_card_ref); | |
395 | ||
746df948 TI |
396 | /* return non-zero if a card is already locked */ |
397 | int snd_card_locked(int card) | |
398 | { | |
742ecf3c TI |
399 | guard(mutex)(&snd_card_mutex); |
400 | return test_bit(card, snd_cards_lock); | |
746df948 TI |
401 | } |
402 | ||
b3b0abe1 CL |
403 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
404 | { | |
405 | return -ENODEV; | |
406 | } | |
407 | ||
408 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
409 | size_t count, loff_t *offset) | |
410 | { | |
411 | return -ENODEV; | |
412 | } | |
413 | ||
414 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
415 | size_t count, loff_t *offset) | |
416 | { | |
417 | return -ENODEV; | |
418 | } | |
419 | ||
a9edfc60 KW |
420 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
421 | { | |
422 | struct snd_monitor_file *df = NULL, *_df; | |
423 | ||
742ecf3c TI |
424 | scoped_guard(spinlock, &shutdown_lock) { |
425 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
426 | if (_df->file == file) { | |
427 | df = _df; | |
428 | list_del_init(&df->shutdown_list); | |
429 | break; | |
430 | } | |
a9edfc60 KW |
431 | } |
432 | } | |
a9edfc60 | 433 | |
233e70f4 AV |
434 | if (likely(df)) { |
435 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
436 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 437 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 438 | } |
a9edfc60 | 439 | |
9bf8e7dd | 440 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
441 | } |
442 | ||
680ef72a | 443 | static __poll_t snd_disconnect_poll(struct file * file, poll_table * wait) |
1da177e4 | 444 | { |
a9a08845 | 445 | return EPOLLERR | EPOLLNVAL; |
1da177e4 LT |
446 | } |
447 | ||
b3b0abe1 CL |
448 | static long snd_disconnect_ioctl(struct file *file, |
449 | unsigned int cmd, unsigned long arg) | |
450 | { | |
451 | return -ENODEV; | |
452 | } | |
453 | ||
454 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
455 | { | |
456 | return -ENODEV; | |
457 | } | |
458 | ||
459 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
460 | { | |
461 | return -ENODEV; | |
462 | } | |
463 | ||
9c2e08c5 | 464 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
465 | { |
466 | .owner = THIS_MODULE, | |
467 | .llseek = snd_disconnect_llseek, | |
468 | .read = snd_disconnect_read, | |
469 | .write = snd_disconnect_write, | |
470 | .release = snd_disconnect_release, | |
471 | .poll = snd_disconnect_poll, | |
472 | .unlocked_ioctl = snd_disconnect_ioctl, | |
473 | #ifdef CONFIG_COMPAT | |
474 | .compat_ioctl = snd_disconnect_ioctl, | |
475 | #endif | |
476 | .mmap = snd_disconnect_mmap, | |
477 | .fasync = snd_disconnect_fasync | |
478 | }; | |
479 | ||
1da177e4 LT |
480 | /** |
481 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
482 | * @card: soundcard structure | |
483 | * | |
484 | * Disconnects all APIs from the file-operations (user space). | |
485 | * | |
eb7c06e8 | 486 | * Return: Zero, otherwise a negative error code. |
1da177e4 LT |
487 | * |
488 | * Note: The current implementation replaces all active file->f_op with special | |
489 | * dummy file operations (they do nothing except release). | |
490 | */ | |
663f922f | 491 | void snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
492 | { |
493 | struct snd_monitor_file *mfile; | |
1da177e4 | 494 | |
f18638dc | 495 | if (!card) |
663f922f | 496 | return; |
f18638dc | 497 | |
742ecf3c TI |
498 | scoped_guard(spinlock, &card->files_lock) { |
499 | if (card->shutdown) | |
500 | return; | |
501 | card->shutdown = 1; | |
1da177e4 | 502 | |
742ecf3c TI |
503 | /* replace file->f_op with special dummy operations */ |
504 | list_for_each_entry(mfile, &card->files_list, list) { | |
505 | /* it's critical part, use endless loop */ | |
506 | /* we have no room to fail */ | |
507 | mfile->disconnected_f_op = mfile->file->f_op; | |
1da177e4 | 508 | |
742ecf3c TI |
509 | scoped_guard(spinlock, &shutdown_lock) |
510 | list_add(&mfile->shutdown_list, &shutdown_files); | |
1da177e4 | 511 | |
742ecf3c TI |
512 | mfile->file->f_op = &snd_shutdown_f_ops; |
513 | fops_get(mfile->file->f_op); | |
514 | } | |
1da177e4 | 515 | } |
1da177e4 | 516 | |
87988a53 TI |
517 | #ifdef CONFIG_PM |
518 | /* wake up sleepers here before other callbacks for avoiding potential | |
519 | * deadlocks with other locks (e.g. in kctls); | |
520 | * then this notifies the shutdown and sleepers would abort immediately | |
521 | */ | |
522 | wake_up_all(&card->power_sleep); | |
523 | #endif | |
524 | ||
2a3f7221 | 525 | /* notify all connected devices about disconnection */ |
1da177e4 LT |
526 | /* at this point, they cannot respond to any calls except release() */ |
527 | ||
8eeaa2f9 | 528 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
529 | if (snd_mixer_oss_notify_callback) |
530 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
531 | #endif | |
532 | ||
533 | /* notify all devices that we are disconnected */ | |
e086e303 | 534 | snd_device_disconnect_all(card); |
1da177e4 | 535 | |
29bb274e TI |
536 | if (card->sync_irq > 0) |
537 | synchronize_irq(card->sync_irq); | |
538 | ||
746d4a02 | 539 | snd_info_card_disconnect(card); |
495000a3 TI |
540 | #ifdef CONFIG_SND_DEBUG |
541 | debugfs_remove(card->debugfs_root); | |
542 | card->debugfs_root = NULL; | |
543 | #endif | |
544 | ||
8bfb181c TI |
545 | if (card->registered) { |
546 | device_del(&card->card_dev); | |
547 | card->registered = false; | |
73d38b13 | 548 | } |
2a3f7221 TI |
549 | |
550 | /* disable fops (user space) operations for ALSA API */ | |
742ecf3c TI |
551 | scoped_guard(mutex, &snd_card_mutex) { |
552 | snd_cards[card->number] = NULL; | |
553 | clear_bit(card->number, snd_cards_lock); | |
554 | } | |
2a3f7221 | 555 | |
e94fdbd7 | 556 | snd_power_sync_ref(card); |
1da177e4 | 557 | } |
c0d3fb39 TI |
558 | EXPORT_SYMBOL(snd_card_disconnect); |
559 | ||
c44027c8 TI |
560 | /** |
561 | * snd_card_disconnect_sync - disconnect card and wait until files get closed | |
562 | * @card: card object to disconnect | |
563 | * | |
564 | * This calls snd_card_disconnect() for disconnecting all belonging components | |
565 | * and waits until all pending files get closed. | |
566 | * It assures that all accesses from user-space finished so that the driver | |
567 | * can release its resources gracefully. | |
568 | */ | |
569 | void snd_card_disconnect_sync(struct snd_card *card) | |
570 | { | |
663f922f | 571 | snd_card_disconnect(card); |
c44027c8 | 572 | |
742ecf3c | 573 | guard(spinlock_irq)(&card->files_lock); |
c44027c8 TI |
574 | wait_event_lock_irq(card->remove_sleep, |
575 | list_empty(&card->files_list), | |
576 | card->files_lock); | |
c44027c8 TI |
577 | } |
578 | EXPORT_SYMBOL_GPL(snd_card_disconnect_sync); | |
579 | ||
c461482c | 580 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 581 | { |
e8ad415b | 582 | card->releasing = true; |
8eeaa2f9 | 583 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
584 | if (snd_mixer_oss_notify_callback) |
585 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
586 | #endif | |
72620d60 | 587 | snd_device_free_all(card); |
1da177e4 LT |
588 | if (card->private_free) |
589 | card->private_free(card); | |
1da177e4 | 590 | if (snd_info_card_free(card) < 0) { |
f2f9307a | 591 | dev_warn(card->dev, "unable to free card info\n"); |
1da177e4 LT |
592 | /* Not fatal error */ |
593 | } | |
f2464064 TI |
594 | if (card->release_completion) |
595 | complete(card->release_completion); | |
e8ad415b TI |
596 | if (!card->managed) |
597 | kfree(card); | |
c461482c TI |
598 | return 0; |
599 | } | |
600 | ||
eb9c38d5 TI |
601 | /** |
602 | * snd_card_free_when_closed - Disconnect the card, free it later eventually | |
603 | * @card: soundcard structure | |
604 | * | |
605 | * Unlike snd_card_free(), this function doesn't try to release the card | |
606 | * resource immediately, but tries to disconnect at first. When the card | |
607 | * is still in use, the function returns before freeing the resources. | |
608 | * The card resources will be freed when the refcount gets to zero. | |
281dee67 TI |
609 | * |
610 | * Return: zero if successful, or a negative error code | |
eb9c38d5 | 611 | */ |
73c5685c | 612 | void snd_card_free_when_closed(struct snd_card *card) |
c461482c | 613 | { |
663f922f | 614 | if (!card) |
73c5685c | 615 | return; |
663f922f UKK |
616 | |
617 | snd_card_disconnect(card); | |
f2464064 | 618 | put_device(&card->card_dev); |
73c5685c | 619 | return; |
c461482c | 620 | } |
c461482c TI |
621 | EXPORT_SYMBOL(snd_card_free_when_closed); |
622 | ||
eb9c38d5 TI |
623 | /** |
624 | * snd_card_free - frees given soundcard structure | |
625 | * @card: soundcard structure | |
626 | * | |
627 | * This function releases the soundcard structure and the all assigned | |
628 | * devices automatically. That is, you don't have to release the devices | |
629 | * by yourself. | |
630 | * | |
631 | * This function waits until the all resources are properly released. | |
632 | * | |
633 | * Return: Zero. Frees all associated devices and frees the control | |
634 | * interface associated to given soundcard. | |
635 | */ | |
25a5a77a | 636 | void snd_card_free(struct snd_card *card) |
c461482c | 637 | { |
bec206db | 638 | DECLARE_COMPLETION_ONSTACK(released); |
f2464064 | 639 | |
825a5248 TI |
640 | /* The call of snd_card_free() is allowed from various code paths; |
641 | * a manual call from the driver and the call via devres_free, and | |
642 | * we need to avoid double-free. Moreover, the release via devres | |
643 | * may call snd_card_free() twice due to its nature, we need to have | |
644 | * the check here at the beginning. | |
645 | */ | |
646 | if (card->releasing) | |
25a5a77a | 647 | return; |
825a5248 | 648 | |
f2464064 | 649 | card->release_completion = &released; |
73c5685c UKK |
650 | snd_card_free_when_closed(card); |
651 | ||
c461482c | 652 | /* wait, until all devices are ready for the free operation */ |
f2464064 | 653 | wait_for_completion(&released); |
1da177e4 | 654 | } |
c0d3fb39 TI |
655 | EXPORT_SYMBOL(snd_card_free); |
656 | ||
e7df2a3a TI |
657 | /* retrieve the last word of shortname or longname */ |
658 | static const char *retrieve_id_from_card_name(const char *name) | |
1da177e4 | 659 | { |
e7df2a3a TI |
660 | const char *spos = name; |
661 | ||
662 | while (*name) { | |
663 | if (isspace(*name) && isalnum(name[1])) | |
664 | spos = name + 1; | |
665 | name++; | |
1da177e4 | 666 | } |
e7df2a3a TI |
667 | return spos; |
668 | } | |
669 | ||
670 | /* return true if the given id string doesn't conflict any other card ids */ | |
671 | static bool card_id_ok(struct snd_card *card, const char *id) | |
672 | { | |
673 | int i; | |
674 | if (!snd_info_check_reserved_words(id)) | |
675 | return false; | |
676 | for (i = 0; i < snd_ecards_limit; i++) { | |
677 | if (snd_cards[i] && snd_cards[i] != card && | |
678 | !strcmp(snd_cards[i]->id, id)) | |
679 | return false; | |
1da177e4 | 680 | } |
e7df2a3a TI |
681 | return true; |
682 | } | |
1da177e4 | 683 | |
e7df2a3a TI |
684 | /* copy to card->id only with valid letters from nid */ |
685 | static void copy_valid_id_string(struct snd_card *card, const char *src, | |
686 | const char *nid) | |
687 | { | |
688 | char *id = card->id; | |
689 | ||
690 | while (*nid && !isalnum(*nid)) | |
691 | nid++; | |
692 | if (isdigit(*nid)) | |
693 | *id++ = isalpha(*src) ? *src : 'D'; | |
694 | while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
695 | if (isalnum(*nid)) | |
696 | *id++ = *nid; | |
697 | nid++; | |
698 | } | |
699 | *id = 0; | |
700 | } | |
701 | ||
702 | /* Set card->id from the given string | |
703 | * If the string conflicts with other ids, add a suffix to make it unique. | |
704 | */ | |
705 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *src, | |
706 | const char *nid) | |
707 | { | |
708 | int len, loops; | |
e7df2a3a TI |
709 | bool is_default = false; |
710 | char *id; | |
1da177e4 | 711 | |
e7df2a3a TI |
712 | copy_valid_id_string(card, src, nid); |
713 | id = card->id; | |
714 | ||
715 | again: | |
716 | /* use "Default" for obviously invalid strings | |
717 | * ("card" conflicts with proc directories) | |
718 | */ | |
719 | if (!*id || !strncmp(id, "card", 4)) { | |
d8e4f9ae | 720 | strcpy(id, "Default"); |
e7df2a3a TI |
721 | is_default = true; |
722 | } | |
1da177e4 | 723 | |
8edbb198 | 724 | len = strlen(id); |
e7df2a3a | 725 | for (loops = 0; loops < SNDRV_CARDS; loops++) { |
8edbb198 TI |
726 | char *spos; |
727 | char sfxstr[5]; /* "_012" */ | |
728 | int sfxlen; | |
729 | ||
e7df2a3a TI |
730 | if (card_id_ok(card, id)) |
731 | return; /* OK */ | |
1da177e4 | 732 | |
8edbb198 TI |
733 | /* Add _XYZ suffix */ |
734 | sprintf(sfxstr, "_%X", loops + 1); | |
735 | sfxlen = strlen(sfxstr); | |
736 | if (len + sfxlen >= sizeof(card->id)) | |
737 | spos = id + sizeof(card->id) - sfxlen - 1; | |
738 | else | |
739 | spos = id + len; | |
740 | strcpy(spos, sfxstr); | |
1da177e4 | 741 | } |
e7df2a3a TI |
742 | /* fallback to the default id */ |
743 | if (!is_default) { | |
744 | *id = 0; | |
745 | goto again; | |
746 | } | |
747 | /* last resort... */ | |
f2f9307a | 748 | dev_err(card->dev, "unable to set card id (%s)\n", id); |
e7df2a3a | 749 | if (card->proc_root->name) |
75b1a8f9 | 750 | strscpy(card->id, card->proc_root->name, sizeof(card->id)); |
1da177e4 LT |
751 | } |
752 | ||
872c7820 MB |
753 | /** |
754 | * snd_card_set_id - set card identification name | |
755 | * @card: soundcard structure | |
756 | * @nid: new identification string | |
757 | * | |
758 | * This function sets the card identification and checks for name | |
759 | * collisions. | |
760 | */ | |
761 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
762 | { | |
5fdc18d9 JK |
763 | /* check if user specified own card->id */ |
764 | if (card->id[0] != '\0') | |
765 | return; | |
742ecf3c | 766 | guard(mutex)(&snd_card_mutex); |
e7df2a3a | 767 | snd_card_set_id_no_lock(card, nid, nid); |
872c7820 | 768 | } |
10a8ebbb JK |
769 | EXPORT_SYMBOL(snd_card_set_id); |
770 | ||
873fd813 Y |
771 | static ssize_t id_show(struct device *dev, |
772 | struct device_attribute *attr, char *buf) | |
9fb6198e | 773 | { |
b203dbab | 774 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
0031812b | 775 | return sysfs_emit(buf, "%s\n", card->id); |
9fb6198e JK |
776 | } |
777 | ||
873fd813 Y |
778 | static ssize_t id_store(struct device *dev, struct device_attribute *attr, |
779 | const char *buf, size_t count) | |
9fb6198e | 780 | { |
b203dbab | 781 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
9fb6198e JK |
782 | char buf1[sizeof(card->id)]; |
783 | size_t copy = count > sizeof(card->id) - 1 ? | |
784 | sizeof(card->id) - 1 : count; | |
785 | size_t idx; | |
786 | int c; | |
787 | ||
788 | for (idx = 0; idx < copy; idx++) { | |
789 | c = buf[idx]; | |
790 | if (!isalnum(c) && c != '_' && c != '-') | |
791 | return -EINVAL; | |
792 | } | |
793 | memcpy(buf1, buf, copy); | |
794 | buf1[copy] = '\0'; | |
742ecf3c TI |
795 | guard(mutex)(&snd_card_mutex); |
796 | if (!card_id_ok(NULL, buf1)) | |
9fb6198e | 797 | return -EEXIST; |
9fb6198e | 798 | strcpy(card->id, buf1); |
c2eb9c4e | 799 | snd_info_card_id_change(card); |
9fb6198e JK |
800 | |
801 | return count; | |
802 | } | |
803 | ||
873fd813 | 804 | static DEVICE_ATTR_RW(id); |
9fb6198e | 805 | |
873fd813 Y |
806 | static ssize_t number_show(struct device *dev, |
807 | struct device_attribute *attr, char *buf) | |
9fb6198e | 808 | { |
b203dbab | 809 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
0031812b | 810 | return sysfs_emit(buf, "%i\n", card->number); |
9fb6198e JK |
811 | } |
812 | ||
873fd813 | 813 | static DEVICE_ATTR_RO(number); |
34356dbd TI |
814 | |
815 | static struct attribute *card_dev_attrs[] = { | |
816 | &dev_attr_id.attr, | |
817 | &dev_attr_number.attr, | |
818 | NULL | |
819 | }; | |
820 | ||
6bbc7fed | 821 | static const struct attribute_group card_dev_attr_group = { |
34356dbd TI |
822 | .attrs = card_dev_attrs, |
823 | }; | |
824 | ||
6bbc7fed TI |
825 | /** |
826 | * snd_card_add_dev_attr - Append a new sysfs attribute group to card | |
827 | * @card: card instance | |
828 | * @group: attribute group to append | |
281dee67 TI |
829 | * |
830 | * Return: zero if successful, or a negative error code | |
6bbc7fed TI |
831 | */ |
832 | int snd_card_add_dev_attr(struct snd_card *card, | |
833 | const struct attribute_group *group) | |
834 | { | |
835 | int i; | |
836 | ||
837 | /* loop for (arraysize-1) here to keep NULL at the last entry */ | |
838 | for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) { | |
839 | if (!card->dev_groups[i]) { | |
840 | card->dev_groups[i] = group; | |
841 | return 0; | |
842 | } | |
843 | } | |
844 | ||
845 | dev_err(card->dev, "Too many groups assigned\n"); | |
846 | return -ENOSPC; | |
35f80014 | 847 | } |
6bbc7fed | 848 | EXPORT_SYMBOL_GPL(snd_card_add_dev_attr); |
9fb6198e | 849 | |
e8ad415b TI |
850 | static void trigger_card_free(void *data) |
851 | { | |
825a5248 | 852 | snd_card_free(data); |
e8ad415b TI |
853 | } |
854 | ||
1da177e4 LT |
855 | /** |
856 | * snd_card_register - register the soundcard | |
857 | * @card: soundcard structure | |
858 | * | |
859 | * This function registers all the devices assigned to the soundcard. | |
860 | * Until calling this, the ALSA control interface is blocked from the | |
861 | * external accesses. Thus, you should call this function at the end | |
862 | * of the initialization of the card. | |
863 | * | |
eb7c06e8 | 864 | * Return: Zero otherwise a negative error code if the registration failed. |
1da177e4 | 865 | */ |
512bbd6a | 866 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
867 | { |
868 | int err; | |
1da177e4 | 869 | |
7eaa943c TI |
870 | if (snd_BUG_ON(!card)) |
871 | return -EINVAL; | |
39aba963 | 872 | |
8bfb181c TI |
873 | if (!card->registered) { |
874 | err = device_add(&card->card_dev); | |
875 | if (err < 0) | |
876 | return err; | |
877 | card->registered = true; | |
e8ad415b TI |
878 | } else { |
879 | if (card->managed) | |
880 | devm_remove_action(card->dev, trigger_card_free, card); | |
881 | } | |
882 | ||
883 | if (card->managed) { | |
884 | err = devm_add_action(card->dev, trigger_card_free, card); | |
885 | if (err < 0) | |
886 | return err; | |
d80f19fa | 887 | } |
39aba963 | 888 | |
e3ded899 TI |
889 | err = snd_device_register_all(card); |
890 | if (err < 0) | |
1da177e4 | 891 | return err; |
742ecf3c TI |
892 | scoped_guard(mutex, &snd_card_mutex) { |
893 | if (snd_cards[card->number]) { | |
894 | /* already registered */ | |
895 | return snd_info_card_register(card); /* register pending info */ | |
896 | } | |
897 | if (*card->id) { | |
898 | /* make a unique id name from the given string */ | |
899 | char tmpid[sizeof(card->id)]; | |
900 | ||
901 | memcpy(tmpid, card->id, sizeof(card->id)); | |
902 | snd_card_set_id_no_lock(card, tmpid, tmpid); | |
903 | } else { | |
904 | /* create an id from either shortname or longname */ | |
905 | const char *src; | |
906 | ||
907 | src = *card->shortname ? card->shortname : card->longname; | |
908 | snd_card_set_id_no_lock(card, src, | |
909 | retrieve_id_from_card_name(src)); | |
910 | } | |
911 | snd_cards[card->number] = card; | |
e7df2a3a | 912 | } |
29b2625f TI |
913 | err = snd_info_card_register(card); |
914 | if (err < 0) | |
915 | return err; | |
916 | ||
8eeaa2f9 | 917 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
918 | if (snd_mixer_oss_notify_callback) |
919 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e | 920 | #endif |
1da177e4 LT |
921 | return 0; |
922 | } | |
c0d3fb39 TI |
923 | EXPORT_SYMBOL(snd_card_register); |
924 | ||
cd6a6503 | 925 | #ifdef CONFIG_SND_PROC_FS |
a381a7a6 TI |
926 | static void snd_card_info_read(struct snd_info_entry *entry, |
927 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
928 | { |
929 | int idx, count; | |
512bbd6a | 930 | struct snd_card *card; |
1da177e4 LT |
931 | |
932 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
742ecf3c | 933 | guard(mutex)(&snd_card_mutex); |
e3ded899 TI |
934 | card = snd_cards[idx]; |
935 | if (card) { | |
1da177e4 | 936 | count++; |
d001544d | 937 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
938 | idx, |
939 | card->id, | |
940 | card->driver, | |
941 | card->shortname); | |
d001544d | 942 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
943 | card->longname); |
944 | } | |
1da177e4 LT |
945 | } |
946 | if (!count) | |
947 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
948 | } | |
949 | ||
e28563cc | 950 | #ifdef CONFIG_SND_OSSEMUL |
512bbd6a | 951 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
952 | { |
953 | int idx, count; | |
512bbd6a | 954 | struct snd_card *card; |
1da177e4 LT |
955 | |
956 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
742ecf3c | 957 | guard(mutex)(&snd_card_mutex); |
e3ded899 TI |
958 | card = snd_cards[idx]; |
959 | if (card) { | |
1da177e4 LT |
960 | count++; |
961 | snd_iprintf(buffer, "%s\n", card->longname); | |
962 | } | |
1da177e4 LT |
963 | } |
964 | if (!count) { | |
965 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
966 | } | |
967 | } | |
968 | ||
969 | #endif | |
970 | ||
c1a8d5f3 | 971 | #ifdef CONFIG_MODULES |
512bbd6a TI |
972 | static void snd_card_module_info_read(struct snd_info_entry *entry, |
973 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
974 | { |
975 | int idx; | |
512bbd6a | 976 | struct snd_card *card; |
1da177e4 LT |
977 | |
978 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
742ecf3c | 979 | guard(mutex)(&snd_card_mutex); |
e3ded899 TI |
980 | card = snd_cards[idx]; |
981 | if (card) | |
d001544d CL |
982 | snd_iprintf(buffer, "%2i %s\n", |
983 | idx, card->module->name); | |
1da177e4 LT |
984 | } |
985 | } | |
986 | #endif | |
987 | ||
988 | int __init snd_card_info_init(void) | |
989 | { | |
512bbd6a | 990 | struct snd_info_entry *entry; |
1da177e4 LT |
991 | |
992 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
993 | if (! entry) |
994 | return -ENOMEM; | |
1da177e4 | 995 | entry->c.text.read = snd_card_info_read; |
b591b6e9 TI |
996 | if (snd_info_register(entry) < 0) |
997 | return -ENOMEM; /* freed in error path */ | |
1da177e4 | 998 | |
c1a8d5f3 | 999 | #ifdef CONFIG_MODULES |
1da177e4 | 1000 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); |
b591b6e9 TI |
1001 | if (!entry) |
1002 | return -ENOMEM; | |
1003 | entry->c.text.read = snd_card_module_info_read; | |
1004 | if (snd_info_register(entry) < 0) | |
1005 | return -ENOMEM; /* freed in error path */ | |
1da177e4 LT |
1006 | #endif |
1007 | ||
1008 | return 0; | |
1009 | } | |
cd6a6503 | 1010 | #endif /* CONFIG_SND_PROC_FS */ |
e28563cc | 1011 | |
1da177e4 LT |
1012 | /** |
1013 | * snd_component_add - add a component string | |
1014 | * @card: soundcard structure | |
1015 | * @component: the component id string | |
1016 | * | |
1017 | * This function adds the component id string to the supported list. | |
1018 | * The component can be referred from the alsa-lib. | |
1019 | * | |
eb7c06e8 | 1020 | * Return: Zero otherwise a negative error code. |
1da177e4 LT |
1021 | */ |
1022 | ||
512bbd6a | 1023 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
1024 | { |
1025 | char *ptr; | |
1026 | int len = strlen(component); | |
1027 | ||
1028 | ptr = strstr(card->components, component); | |
1029 | if (ptr != NULL) { | |
1030 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
1031 | return 1; | |
1032 | } | |
1033 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
1034 | snd_BUG(); | |
1035 | return -ENOMEM; | |
1036 | } | |
1037 | if (card->components[0] != '\0') | |
1038 | strcat(card->components, " "); | |
1039 | strcat(card->components, component); | |
1040 | return 0; | |
1041 | } | |
c0d3fb39 TI |
1042 | EXPORT_SYMBOL(snd_component_add); |
1043 | ||
1da177e4 LT |
1044 | /** |
1045 | * snd_card_file_add - add the file to the file list of the card | |
1046 | * @card: soundcard structure | |
1047 | * @file: file pointer | |
1048 | * | |
1049 | * This function adds the file to the file linked-list of the card. | |
1050 | * This linked-list is used to keep tracking the connection state, | |
1051 | * and to avoid the release of busy resources by hotplug. | |
1052 | * | |
eb7c06e8 | 1053 | * Return: zero or a negative error code. |
1da177e4 | 1054 | */ |
512bbd6a | 1055 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
1056 | { |
1057 | struct snd_monitor_file *mfile; | |
1058 | ||
1059 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
1060 | if (mfile == NULL) | |
1061 | return -ENOMEM; | |
1062 | mfile->file = file; | |
a9edfc60 | 1063 | mfile->disconnected_f_op = NULL; |
a45e3d6b | 1064 | INIT_LIST_HEAD(&mfile->shutdown_list); |
742ecf3c | 1065 | guard(spinlock)(&card->files_lock); |
1da177e4 | 1066 | if (card->shutdown) { |
1da177e4 LT |
1067 | kfree(mfile); |
1068 | return -ENODEV; | |
1069 | } | |
118dd6bf | 1070 | list_add(&mfile->list, &card->files_list); |
f2464064 | 1071 | get_device(&card->card_dev); |
1da177e4 LT |
1072 | return 0; |
1073 | } | |
c0d3fb39 TI |
1074 | EXPORT_SYMBOL(snd_card_file_add); |
1075 | ||
1da177e4 LT |
1076 | /** |
1077 | * snd_card_file_remove - remove the file from the file list | |
1078 | * @card: soundcard structure | |
1079 | * @file: file pointer | |
1080 | * | |
1081 | * This function removes the file formerly added to the card via | |
1082 | * snd_card_file_add() function. | |
2b29b13c TI |
1083 | * If all files are removed and snd_card_free_when_closed() was |
1084 | * called beforehand, it processes the pending release of | |
1085 | * resources. | |
1da177e4 | 1086 | * |
eb7c06e8 | 1087 | * Return: Zero or a negative error code. |
1da177e4 | 1088 | */ |
512bbd6a | 1089 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 1090 | { |
118dd6bf | 1091 | struct snd_monitor_file *mfile, *found = NULL; |
1da177e4 | 1092 | |
742ecf3c TI |
1093 | scoped_guard(spinlock, &card->files_lock) { |
1094 | list_for_each_entry(mfile, &card->files_list, list) { | |
1095 | if (mfile->file == file) { | |
1096 | list_del(&mfile->list); | |
1097 | scoped_guard(spinlock, &shutdown_lock) | |
1098 | list_del(&mfile->shutdown_list); | |
1099 | if (mfile->disconnected_f_op) | |
1100 | fops_put(mfile->disconnected_f_op); | |
1101 | found = mfile; | |
1102 | break; | |
1103 | } | |
1da177e4 | 1104 | } |
742ecf3c TI |
1105 | if (list_empty(&card->files_list)) |
1106 | wake_up_all(&card->remove_sleep); | |
a9edfc60 | 1107 | } |
118dd6bf | 1108 | if (!found) { |
f2f9307a | 1109 | dev_err(card->dev, "card file remove problem (%p)\n", file); |
1da177e4 LT |
1110 | return -ENOENT; |
1111 | } | |
118dd6bf | 1112 | kfree(found); |
f2464064 | 1113 | put_device(&card->card_dev); |
1da177e4 LT |
1114 | return 0; |
1115 | } | |
c0d3fb39 TI |
1116 | EXPORT_SYMBOL(snd_card_file_remove); |
1117 | ||
1da177e4 LT |
1118 | #ifdef CONFIG_PM |
1119 | /** | |
e94fdbd7 TI |
1120 | * snd_power_ref_and_wait - wait until the card gets powered up |
1121 | * @card: soundcard structure | |
1da177e4 | 1122 | * |
e94fdbd7 TI |
1123 | * Take the power_ref reference count of the given card, and |
1124 | * wait until the card gets powered up to SNDRV_CTL_POWER_D0 state. | |
1125 | * The refcount is down again while sleeping until power-up, hence this | |
1126 | * function can be used for syncing the floating control ops accesses, | |
1127 | * typically around calling control ops. | |
1da177e4 | 1128 | * |
e94fdbd7 TI |
1129 | * The caller needs to pull down the refcount via snd_power_unref() later |
1130 | * no matter whether the error is returned from this function or not. | |
1131 | * | |
1132 | * Return: Zero if successful, or a negative error code. | |
1da177e4 | 1133 | */ |
e94fdbd7 | 1134 | int snd_power_ref_and_wait(struct snd_card *card) |
1da177e4 | 1135 | { |
e94fdbd7 | 1136 | snd_power_ref(card); |
e94fdbd7 | 1137 | if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) |
1da177e4 | 1138 | return 0; |
8c0ae778 TI |
1139 | wait_event_cmd(card->power_sleep, |
1140 | card->shutdown || | |
1141 | snd_power_get_state(card) == SNDRV_CTL_POWER_D0, | |
1142 | snd_power_unref(card), snd_power_ref(card)); | |
1143 | return card->shutdown ? -ENODEV : 0; | |
1da177e4 | 1144 | } |
e94fdbd7 TI |
1145 | EXPORT_SYMBOL_GPL(snd_power_ref_and_wait); |
1146 | ||
1147 | /** | |
1148 | * snd_power_wait - wait until the card gets powered up (old form) | |
1149 | * @card: soundcard structure | |
e94fdbd7 TI |
1150 | * |
1151 | * Wait until the card gets powered up to SNDRV_CTL_POWER_D0 state. | |
e94fdbd7 TI |
1152 | * |
1153 | * Return: Zero if successful, or a negative error code. | |
1154 | */ | |
b6cc78da | 1155 | int snd_power_wait(struct snd_card *card) |
e94fdbd7 TI |
1156 | { |
1157 | int ret; | |
1158 | ||
e94fdbd7 TI |
1159 | ret = snd_power_ref_and_wait(card); |
1160 | snd_power_unref(card); | |
1161 | return ret; | |
1162 | } | |
c0d3fb39 | 1163 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 1164 | #endif /* CONFIG_PM */ |