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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> |
f2464064 | 31 | #include <linux/completion.h> |
d052d1be | 32 | |
1da177e4 LT |
33 | #include <sound/core.h> |
34 | #include <sound/control.h> | |
35 | #include <sound/info.h> | |
36 | ||
82a783f4 TI |
37 | /* monitor files for graceful shutdown (hotplug) */ |
38 | struct snd_monitor_file { | |
39 | struct file *file; | |
40 | const struct file_operations *disconnected_f_op; | |
41 | struct list_head shutdown_list; /* still need to shutdown */ | |
42 | struct list_head list; /* link of monitor files */ | |
43 | }; | |
44 | ||
a9edfc60 KW |
45 | static DEFINE_SPINLOCK(shutdown_lock); |
46 | static LIST_HEAD(shutdown_files); | |
47 | ||
9c2e08c5 | 48 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 49 | |
7bb2491b TI |
50 | /* locked for registering/using */ |
51 | static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS); | |
6581f4e7 | 52 | struct snd_card *snd_cards[SNDRV_CARDS]; |
c0d3fb39 TI |
53 | EXPORT_SYMBOL(snd_cards); |
54 | ||
746df948 | 55 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 | 56 | |
304cd07f TI |
57 | static char *slots[SNDRV_CARDS]; |
58 | module_param_array(slots, charp, NULL, 0444); | |
59 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); | |
60 | ||
a93bbaa7 | 61 | /* return non-zero if the given index is reserved for the given |
304cd07f TI |
62 | * module via slots option |
63 | */ | |
a93bbaa7 | 64 | static int module_slot_match(struct module *module, int idx) |
304cd07f | 65 | { |
a93bbaa7 | 66 | int match = 1; |
304cd07f | 67 | #ifdef MODULE |
a93bbaa7 TI |
68 | const char *s1, *s2; |
69 | ||
60f6fef8 | 70 | if (!module || !*module->name || !slots[idx]) |
304cd07f | 71 | return 0; |
a93bbaa7 TI |
72 | |
73 | s1 = module->name; | |
74 | s2 = slots[idx]; | |
75 | if (*s2 == '!') { | |
76 | match = 0; /* negative match */ | |
77 | s2++; | |
78 | } | |
304cd07f TI |
79 | /* compare module name strings |
80 | * hyphens are handled as equivalent with underscore | |
81 | */ | |
82 | for (;;) { | |
83 | char c1 = *s1++; | |
84 | char c2 = *s2++; | |
85 | if (c1 == '-') | |
86 | c1 = '_'; | |
87 | if (c2 == '-') | |
88 | c2 = '_'; | |
89 | if (c1 != c2) | |
a93bbaa7 | 90 | return !match; |
304cd07f TI |
91 | if (!c1) |
92 | break; | |
93 | } | |
a93bbaa7 TI |
94 | #endif /* MODULE */ |
95 | return match; | |
304cd07f TI |
96 | } |
97 | ||
8eeaa2f9 | 98 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
512bbd6a | 99 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 100 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
101 | #endif |
102 | ||
cd6a6503 | 103 | #ifdef CONFIG_SND_PROC_FS |
512bbd6a TI |
104 | static void snd_card_id_read(struct snd_info_entry *entry, |
105 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
106 | { |
107 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
108 | } | |
109 | ||
2471b6c8 | 110 | static int init_info_for_card(struct snd_card *card) |
e28563cc | 111 | { |
e28563cc TI |
112 | struct snd_info_entry *entry; |
113 | ||
2471b6c8 TI |
114 | entry = snd_info_create_card_entry(card, "id", card->proc_root); |
115 | if (!entry) { | |
f2f9307a | 116 | dev_dbg(card->dev, "unable to create card entry\n"); |
0755e74b | 117 | return -ENOMEM; |
e28563cc | 118 | } |
e28563cc | 119 | entry->c.text.read = snd_card_id_read; |
e28563cc | 120 | card->proc_id = entry; |
2471b6c8 TI |
121 | |
122 | return snd_info_card_register(card); | |
e28563cc | 123 | } |
cd6a6503 | 124 | #else /* !CONFIG_SND_PROC_FS */ |
e28563cc TI |
125 | #define init_info_for_card(card) |
126 | #endif | |
127 | ||
deb6596f TI |
128 | static int check_empty_slot(struct module *module, int slot) |
129 | { | |
130 | return !slots[slot] || !*slots[slot]; | |
131 | } | |
132 | ||
133 | /* return an empty slot number (>= 0) found in the given bitmask @mask. | |
134 | * @mask == -1 == 0xffffffff means: take any free slot up to 32 | |
135 | * when no slot is available, return the original @mask as is. | |
136 | */ | |
137 | static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int), | |
138 | struct module *module) | |
139 | { | |
140 | int slot; | |
141 | ||
142 | for (slot = 0; slot < SNDRV_CARDS; slot++) { | |
143 | if (slot < 32 && !(mask & (1U << slot))) | |
144 | continue; | |
145 | if (!test_bit(slot, snd_cards_lock)) { | |
146 | if (check(module, slot)) | |
147 | return slot; /* found */ | |
148 | } | |
149 | } | |
150 | return mask; /* unchanged */ | |
151 | } | |
152 | ||
4b440be6 TI |
153 | /* the default release callback set in snd_device_initialize() below; |
154 | * this is just NOP for now, as almost all jobs are already done in | |
155 | * dev_free callback of snd_device chain instead. | |
156 | */ | |
157 | static void default_release(struct device *dev) | |
158 | { | |
159 | } | |
160 | ||
161 | /** | |
162 | * snd_device_initialize - Initialize struct device for sound devices | |
163 | * @dev: device to initialize | |
164 | * @card: card to assign, optional | |
165 | */ | |
166 | void snd_device_initialize(struct device *dev, struct snd_card *card) | |
167 | { | |
168 | device_initialize(dev); | |
169 | if (card) | |
170 | dev->parent = &card->card_dev; | |
171 | dev->class = sound_class; | |
172 | dev->release = default_release; | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(snd_device_initialize); | |
175 | ||
8bfb181c | 176 | static int snd_card_do_free(struct snd_card *card); |
6bbc7fed | 177 | static const struct attribute_group card_dev_attr_group; |
8bfb181c TI |
178 | |
179 | static void release_card_device(struct device *dev) | |
180 | { | |
181 | snd_card_do_free(dev_to_snd_card(dev)); | |
182 | } | |
183 | ||
1da177e4 | 184 | /** |
393aa9c1 TI |
185 | * snd_card_new - create and initialize a soundcard structure |
186 | * @parent: the parent device object | |
1da177e4 LT |
187 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
188 | * @xid: card identification (ASCII string) | |
189 | * @module: top level module for locking | |
190 | * @extra_size: allocate this extra size after the main soundcard structure | |
53fb1e63 | 191 | * @card_ret: the pointer to store the created card instance |
1da177e4 LT |
192 | * |
193 | * Creates and initializes a soundcard structure. | |
194 | * | |
53fb1e63 TI |
195 | * The function allocates snd_card instance via kzalloc with the given |
196 | * space for the driver to use freely. The allocated struct is stored | |
197 | * in the given card_ret pointer. | |
198 | * | |
eb7c06e8 | 199 | * Return: Zero if successful or a negative error code. |
1da177e4 | 200 | */ |
393aa9c1 | 201 | int snd_card_new(struct device *parent, int idx, const char *xid, |
53fb1e63 TI |
202 | struct module *module, int extra_size, |
203 | struct snd_card **card_ret) | |
1da177e4 | 204 | { |
512bbd6a | 205 | struct snd_card *card; |
deb6596f | 206 | int err; |
1da177e4 | 207 | |
53fb1e63 TI |
208 | if (snd_BUG_ON(!card_ret)) |
209 | return -EINVAL; | |
210 | *card_ret = NULL; | |
211 | ||
1da177e4 LT |
212 | if (extra_size < 0) |
213 | extra_size = 0; | |
ca2c0966 | 214 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
215 | if (!card) |
216 | return -ENOMEM; | |
8bfb181c TI |
217 | if (extra_size > 0) |
218 | card->private_data = (char *)card + sizeof(struct snd_card); | |
10a8ebbb | 219 | if (xid) |
5fdc18d9 | 220 | strlcpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 221 | err = 0; |
746df948 | 222 | mutex_lock(&snd_card_mutex); |
deb6596f TI |
223 | if (idx < 0) /* first check the matching module-name slot */ |
224 | idx = get_slot_from_bitmask(idx, module_slot_match, module); | |
225 | if (idx < 0) /* if not matched, assign an empty slot */ | |
226 | idx = get_slot_from_bitmask(idx, check_empty_slot, module); | |
a93bbaa7 TI |
227 | if (idx < 0) |
228 | err = -ENODEV; | |
229 | else if (idx < snd_ecards_limit) { | |
7bb2491b | 230 | if (test_bit(idx, snd_cards_lock)) |
a93bbaa7 TI |
231 | err = -EBUSY; /* invalid */ |
232 | } else if (idx >= SNDRV_CARDS) | |
233 | err = -ENODEV; | |
234 | if (err < 0) { | |
746df948 | 235 | mutex_unlock(&snd_card_mutex); |
f2f9307a | 236 | dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n", |
5c33dd70 | 237 | idx, snd_ecards_limit - 1, err); |
8bfb181c TI |
238 | kfree(card); |
239 | return err; | |
1da177e4 | 240 | } |
7bb2491b | 241 | set_bit(idx, snd_cards_lock); /* lock it */ |
a93bbaa7 TI |
242 | if (idx >= snd_ecards_limit) |
243 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 244 | mutex_unlock(&snd_card_mutex); |
393aa9c1 | 245 | card->dev = parent; |
1da177e4 LT |
246 | card->number = idx; |
247 | card->module = module; | |
248 | INIT_LIST_HEAD(&card->devices); | |
249 | init_rwsem(&card->controls_rwsem); | |
250 | rwlock_init(&card->ctl_files_rwlock); | |
07f4d9d7 | 251 | mutex_init(&card->user_ctl_lock); |
1da177e4 LT |
252 | INIT_LIST_HEAD(&card->controls); |
253 | INIT_LIST_HEAD(&card->ctl_files); | |
254 | spin_lock_init(&card->files_lock); | |
118dd6bf | 255 | INIT_LIST_HEAD(&card->files_list); |
1da177e4 | 256 | #ifdef CONFIG_PM |
1a60d4c5 | 257 | mutex_init(&card->power_lock); |
1da177e4 LT |
258 | init_waitqueue_head(&card->power_sleep); |
259 | #endif | |
8bfb181c TI |
260 | |
261 | device_initialize(&card->card_dev); | |
262 | card->card_dev.parent = parent; | |
263 | card->card_dev.class = sound_class; | |
264 | card->card_dev.release = release_card_device; | |
6bbc7fed TI |
265 | card->card_dev.groups = card->dev_groups; |
266 | card->dev_groups[0] = &card_dev_attr_group; | |
8bfb181c TI |
267 | err = kobject_set_name(&card->card_dev.kobj, "card%d", idx); |
268 | if (err < 0) | |
269 | goto __error; | |
270 | ||
de65360b HK |
271 | snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s", |
272 | dev_driver_string(card->dev), dev_name(&card->card_dev)); | |
273 | ||
1da177e4 LT |
274 | /* the control interface cannot be accessed from the user space until */ |
275 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
276 | err = snd_ctl_create(card); |
277 | if (err < 0) { | |
f2f9307a | 278 | dev_err(parent, "unable to register control minors\n"); |
1da177e4 LT |
279 | goto __error; |
280 | } | |
53fb1e63 TI |
281 | err = snd_info_card_create(card); |
282 | if (err < 0) { | |
f2f9307a | 283 | dev_err(parent, "unable to create card info\n"); |
1da177e4 LT |
284 | goto __error_ctl; |
285 | } | |
53fb1e63 TI |
286 | *card_ret = card; |
287 | return 0; | |
1da177e4 LT |
288 | |
289 | __error_ctl: | |
289ca025 | 290 | snd_device_free_all(card); |
1da177e4 | 291 | __error: |
8bfb181c | 292 | put_device(&card->card_dev); |
53fb1e63 | 293 | return err; |
1da177e4 | 294 | } |
393aa9c1 | 295 | EXPORT_SYMBOL(snd_card_new); |
c0d3fb39 | 296 | |
746df948 TI |
297 | /* return non-zero if a card is already locked */ |
298 | int snd_card_locked(int card) | |
299 | { | |
300 | int locked; | |
301 | ||
302 | mutex_lock(&snd_card_mutex); | |
7bb2491b | 303 | locked = test_bit(card, snd_cards_lock); |
746df948 TI |
304 | mutex_unlock(&snd_card_mutex); |
305 | return locked; | |
306 | } | |
307 | ||
b3b0abe1 CL |
308 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
309 | { | |
310 | return -ENODEV; | |
311 | } | |
312 | ||
313 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
314 | size_t count, loff_t *offset) | |
315 | { | |
316 | return -ENODEV; | |
317 | } | |
318 | ||
319 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
320 | size_t count, loff_t *offset) | |
321 | { | |
322 | return -ENODEV; | |
323 | } | |
324 | ||
a9edfc60 KW |
325 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
326 | { | |
327 | struct snd_monitor_file *df = NULL, *_df; | |
328 | ||
329 | spin_lock(&shutdown_lock); | |
330 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
331 | if (_df->file == file) { | |
332 | df = _df; | |
118dd6bf | 333 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
334 | break; |
335 | } | |
336 | } | |
337 | spin_unlock(&shutdown_lock); | |
338 | ||
233e70f4 AV |
339 | if (likely(df)) { |
340 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
341 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 342 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 343 | } |
a9edfc60 | 344 | |
9bf8e7dd | 345 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
346 | } |
347 | ||
1da177e4 LT |
348 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
349 | { | |
350 | return POLLERR | POLLNVAL; | |
351 | } | |
352 | ||
b3b0abe1 CL |
353 | static long snd_disconnect_ioctl(struct file *file, |
354 | unsigned int cmd, unsigned long arg) | |
355 | { | |
356 | return -ENODEV; | |
357 | } | |
358 | ||
359 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
360 | { | |
361 | return -ENODEV; | |
362 | } | |
363 | ||
364 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
365 | { | |
366 | return -ENODEV; | |
367 | } | |
368 | ||
9c2e08c5 | 369 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
370 | { |
371 | .owner = THIS_MODULE, | |
372 | .llseek = snd_disconnect_llseek, | |
373 | .read = snd_disconnect_read, | |
374 | .write = snd_disconnect_write, | |
375 | .release = snd_disconnect_release, | |
376 | .poll = snd_disconnect_poll, | |
377 | .unlocked_ioctl = snd_disconnect_ioctl, | |
378 | #ifdef CONFIG_COMPAT | |
379 | .compat_ioctl = snd_disconnect_ioctl, | |
380 | #endif | |
381 | .mmap = snd_disconnect_mmap, | |
382 | .fasync = snd_disconnect_fasync | |
383 | }; | |
384 | ||
1da177e4 LT |
385 | /** |
386 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
387 | * @card: soundcard structure | |
388 | * | |
389 | * Disconnects all APIs from the file-operations (user space). | |
390 | * | |
eb7c06e8 | 391 | * Return: Zero, otherwise a negative error code. |
1da177e4 LT |
392 | * |
393 | * Note: The current implementation replaces all active file->f_op with special | |
394 | * dummy file operations (they do nothing except release). | |
395 | */ | |
512bbd6a | 396 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
397 | { |
398 | struct snd_monitor_file *mfile; | |
1da177e4 | 399 | |
f18638dc TI |
400 | if (!card) |
401 | return -EINVAL; | |
402 | ||
1da177e4 LT |
403 | spin_lock(&card->files_lock); |
404 | if (card->shutdown) { | |
405 | spin_unlock(&card->files_lock); | |
406 | return 0; | |
407 | } | |
408 | card->shutdown = 1; | |
409 | spin_unlock(&card->files_lock); | |
410 | ||
411 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 412 | mutex_lock(&snd_card_mutex); |
1da177e4 | 413 | snd_cards[card->number] = NULL; |
7bb2491b | 414 | clear_bit(card->number, snd_cards_lock); |
746df948 | 415 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
416 | |
417 | /* phase 2: replace file->f_op with special dummy operations */ | |
418 | ||
419 | spin_lock(&card->files_lock); | |
118dd6bf | 420 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 LT |
421 | /* it's critical part, use endless loop */ |
422 | /* we have no room to fail */ | |
a9edfc60 | 423 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 424 | |
a9edfc60 KW |
425 | spin_lock(&shutdown_lock); |
426 | list_add(&mfile->shutdown_list, &shutdown_files); | |
427 | spin_unlock(&shutdown_lock); | |
1da177e4 | 428 | |
a9edfc60 | 429 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 430 | fops_get(mfile->file->f_op); |
1da177e4 LT |
431 | } |
432 | spin_unlock(&card->files_lock); | |
433 | ||
434 | /* phase 3: notify all connected devices about disconnection */ | |
435 | /* at this point, they cannot respond to any calls except release() */ | |
436 | ||
8eeaa2f9 | 437 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
438 | if (snd_mixer_oss_notify_callback) |
439 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
440 | #endif | |
441 | ||
442 | /* notify all devices that we are disconnected */ | |
e086e303 | 443 | snd_device_disconnect_all(card); |
1da177e4 | 444 | |
746d4a02 | 445 | snd_info_card_disconnect(card); |
8bfb181c TI |
446 | if (card->registered) { |
447 | device_del(&card->card_dev); | |
448 | card->registered = false; | |
73d38b13 | 449 | } |
f18638dc TI |
450 | #ifdef CONFIG_PM |
451 | wake_up(&card->power_sleep); | |
73d38b13 | 452 | #endif |
1da177e4 LT |
453 | return 0; |
454 | } | |
c0d3fb39 TI |
455 | EXPORT_SYMBOL(snd_card_disconnect); |
456 | ||
c461482c | 457 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 458 | { |
8eeaa2f9 | 459 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
460 | if (snd_mixer_oss_notify_callback) |
461 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
462 | #endif | |
72620d60 | 463 | snd_device_free_all(card); |
1da177e4 LT |
464 | if (card->private_free) |
465 | card->private_free(card); | |
746d4a02 | 466 | snd_info_free_entry(card->proc_id); |
1da177e4 | 467 | if (snd_info_card_free(card) < 0) { |
f2f9307a | 468 | dev_warn(card->dev, "unable to free card info\n"); |
1da177e4 LT |
469 | /* Not fatal error */ |
470 | } | |
f2464064 TI |
471 | if (card->release_completion) |
472 | complete(card->release_completion); | |
c461482c TI |
473 | kfree(card); |
474 | return 0; | |
475 | } | |
476 | ||
eb9c38d5 TI |
477 | /** |
478 | * snd_card_free_when_closed - Disconnect the card, free it later eventually | |
479 | * @card: soundcard structure | |
480 | * | |
481 | * Unlike snd_card_free(), this function doesn't try to release the card | |
482 | * resource immediately, but tries to disconnect at first. When the card | |
483 | * is still in use, the function returns before freeing the resources. | |
484 | * The card resources will be freed when the refcount gets to zero. | |
485 | */ | |
c461482c TI |
486 | int snd_card_free_when_closed(struct snd_card *card) |
487 | { | |
f2464064 TI |
488 | int ret = snd_card_disconnect(card); |
489 | if (ret) | |
a0830dbd | 490 | return ret; |
f2464064 | 491 | put_device(&card->card_dev); |
c461482c TI |
492 | return 0; |
493 | } | |
c461482c TI |
494 | EXPORT_SYMBOL(snd_card_free_when_closed); |
495 | ||
eb9c38d5 TI |
496 | /** |
497 | * snd_card_free - frees given soundcard structure | |
498 | * @card: soundcard structure | |
499 | * | |
500 | * This function releases the soundcard structure and the all assigned | |
501 | * devices automatically. That is, you don't have to release the devices | |
502 | * by yourself. | |
503 | * | |
504 | * This function waits until the all resources are properly released. | |
505 | * | |
506 | * Return: Zero. Frees all associated devices and frees the control | |
507 | * interface associated to given soundcard. | |
508 | */ | |
c461482c TI |
509 | int snd_card_free(struct snd_card *card) |
510 | { | |
f2464064 TI |
511 | struct completion released; |
512 | int ret; | |
513 | ||
514 | init_completion(&released); | |
515 | card->release_completion = &released; | |
516 | ret = snd_card_free_when_closed(card); | |
c461482c TI |
517 | if (ret) |
518 | return ret; | |
c461482c | 519 | /* wait, until all devices are ready for the free operation */ |
f2464064 | 520 | wait_for_completion(&released); |
1da177e4 LT |
521 | return 0; |
522 | } | |
c0d3fb39 TI |
523 | EXPORT_SYMBOL(snd_card_free); |
524 | ||
e7df2a3a TI |
525 | /* retrieve the last word of shortname or longname */ |
526 | static const char *retrieve_id_from_card_name(const char *name) | |
1da177e4 | 527 | { |
e7df2a3a TI |
528 | const char *spos = name; |
529 | ||
530 | while (*name) { | |
531 | if (isspace(*name) && isalnum(name[1])) | |
532 | spos = name + 1; | |
533 | name++; | |
1da177e4 | 534 | } |
e7df2a3a TI |
535 | return spos; |
536 | } | |
537 | ||
538 | /* return true if the given id string doesn't conflict any other card ids */ | |
539 | static bool card_id_ok(struct snd_card *card, const char *id) | |
540 | { | |
541 | int i; | |
542 | if (!snd_info_check_reserved_words(id)) | |
543 | return false; | |
544 | for (i = 0; i < snd_ecards_limit; i++) { | |
545 | if (snd_cards[i] && snd_cards[i] != card && | |
546 | !strcmp(snd_cards[i]->id, id)) | |
547 | return false; | |
1da177e4 | 548 | } |
e7df2a3a TI |
549 | return true; |
550 | } | |
1da177e4 | 551 | |
e7df2a3a TI |
552 | /* copy to card->id only with valid letters from nid */ |
553 | static void copy_valid_id_string(struct snd_card *card, const char *src, | |
554 | const char *nid) | |
555 | { | |
556 | char *id = card->id; | |
557 | ||
558 | while (*nid && !isalnum(*nid)) | |
559 | nid++; | |
560 | if (isdigit(*nid)) | |
561 | *id++ = isalpha(*src) ? *src : 'D'; | |
562 | while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
563 | if (isalnum(*nid)) | |
564 | *id++ = *nid; | |
565 | nid++; | |
566 | } | |
567 | *id = 0; | |
568 | } | |
569 | ||
570 | /* Set card->id from the given string | |
571 | * If the string conflicts with other ids, add a suffix to make it unique. | |
572 | */ | |
573 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *src, | |
574 | const char *nid) | |
575 | { | |
576 | int len, loops; | |
e7df2a3a TI |
577 | bool is_default = false; |
578 | char *id; | |
1da177e4 | 579 | |
e7df2a3a TI |
580 | copy_valid_id_string(card, src, nid); |
581 | id = card->id; | |
582 | ||
583 | again: | |
584 | /* use "Default" for obviously invalid strings | |
585 | * ("card" conflicts with proc directories) | |
586 | */ | |
587 | if (!*id || !strncmp(id, "card", 4)) { | |
d8e4f9ae | 588 | strcpy(id, "Default"); |
e7df2a3a TI |
589 | is_default = true; |
590 | } | |
1da177e4 | 591 | |
8edbb198 | 592 | len = strlen(id); |
e7df2a3a | 593 | for (loops = 0; loops < SNDRV_CARDS; loops++) { |
8edbb198 TI |
594 | char *spos; |
595 | char sfxstr[5]; /* "_012" */ | |
596 | int sfxlen; | |
597 | ||
e7df2a3a TI |
598 | if (card_id_ok(card, id)) |
599 | return; /* OK */ | |
1da177e4 | 600 | |
8edbb198 TI |
601 | /* Add _XYZ suffix */ |
602 | sprintf(sfxstr, "_%X", loops + 1); | |
603 | sfxlen = strlen(sfxstr); | |
604 | if (len + sfxlen >= sizeof(card->id)) | |
605 | spos = id + sizeof(card->id) - sfxlen - 1; | |
606 | else | |
607 | spos = id + len; | |
608 | strcpy(spos, sfxstr); | |
1da177e4 | 609 | } |
e7df2a3a TI |
610 | /* fallback to the default id */ |
611 | if (!is_default) { | |
612 | *id = 0; | |
613 | goto again; | |
614 | } | |
615 | /* last resort... */ | |
f2f9307a | 616 | dev_err(card->dev, "unable to set card id (%s)\n", id); |
e7df2a3a | 617 | if (card->proc_root->name) |
97f44f56 | 618 | strlcpy(card->id, card->proc_root->name, sizeof(card->id)); |
1da177e4 LT |
619 | } |
620 | ||
872c7820 MB |
621 | /** |
622 | * snd_card_set_id - set card identification name | |
623 | * @card: soundcard structure | |
624 | * @nid: new identification string | |
625 | * | |
626 | * This function sets the card identification and checks for name | |
627 | * collisions. | |
628 | */ | |
629 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
630 | { | |
5fdc18d9 JK |
631 | /* check if user specified own card->id */ |
632 | if (card->id[0] != '\0') | |
633 | return; | |
634 | mutex_lock(&snd_card_mutex); | |
e7df2a3a | 635 | snd_card_set_id_no_lock(card, nid, nid); |
5fdc18d9 | 636 | mutex_unlock(&snd_card_mutex); |
872c7820 | 637 | } |
10a8ebbb JK |
638 | EXPORT_SYMBOL(snd_card_set_id); |
639 | ||
9fb6198e JK |
640 | static ssize_t |
641 | card_id_show_attr(struct device *dev, | |
642 | struct device_attribute *attr, char *buf) | |
643 | { | |
b203dbab TI |
644 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
645 | return snprintf(buf, PAGE_SIZE, "%s\n", card->id); | |
9fb6198e JK |
646 | } |
647 | ||
648 | static ssize_t | |
649 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
650 | const char *buf, size_t count) | |
651 | { | |
b203dbab | 652 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
9fb6198e JK |
653 | char buf1[sizeof(card->id)]; |
654 | size_t copy = count > sizeof(card->id) - 1 ? | |
655 | sizeof(card->id) - 1 : count; | |
656 | size_t idx; | |
657 | int c; | |
658 | ||
659 | for (idx = 0; idx < copy; idx++) { | |
660 | c = buf[idx]; | |
661 | if (!isalnum(c) && c != '_' && c != '-') | |
662 | return -EINVAL; | |
663 | } | |
664 | memcpy(buf1, buf, copy); | |
665 | buf1[copy] = '\0'; | |
666 | mutex_lock(&snd_card_mutex); | |
e7df2a3a | 667 | if (!card_id_ok(NULL, buf1)) { |
9fb6198e JK |
668 | mutex_unlock(&snd_card_mutex); |
669 | return -EEXIST; | |
670 | } | |
9fb6198e | 671 | strcpy(card->id, buf1); |
c2eb9c4e | 672 | snd_info_card_id_change(card); |
9fb6198e JK |
673 | mutex_unlock(&snd_card_mutex); |
674 | ||
675 | return count; | |
676 | } | |
677 | ||
34356dbd | 678 | static DEVICE_ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); |
9fb6198e JK |
679 | |
680 | static ssize_t | |
681 | card_number_show_attr(struct device *dev, | |
682 | struct device_attribute *attr, char *buf) | |
683 | { | |
b203dbab TI |
684 | struct snd_card *card = container_of(dev, struct snd_card, card_dev); |
685 | return snprintf(buf, PAGE_SIZE, "%i\n", card->number); | |
9fb6198e JK |
686 | } |
687 | ||
34356dbd TI |
688 | static DEVICE_ATTR(number, S_IRUGO, card_number_show_attr, NULL); |
689 | ||
690 | static struct attribute *card_dev_attrs[] = { | |
691 | &dev_attr_id.attr, | |
692 | &dev_attr_number.attr, | |
693 | NULL | |
694 | }; | |
695 | ||
6bbc7fed | 696 | static const struct attribute_group card_dev_attr_group = { |
34356dbd TI |
697 | .attrs = card_dev_attrs, |
698 | }; | |
699 | ||
6bbc7fed TI |
700 | /** |
701 | * snd_card_add_dev_attr - Append a new sysfs attribute group to card | |
702 | * @card: card instance | |
703 | * @group: attribute group to append | |
704 | */ | |
705 | int snd_card_add_dev_attr(struct snd_card *card, | |
706 | const struct attribute_group *group) | |
707 | { | |
708 | int i; | |
709 | ||
710 | /* loop for (arraysize-1) here to keep NULL at the last entry */ | |
711 | for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) { | |
712 | if (!card->dev_groups[i]) { | |
713 | card->dev_groups[i] = group; | |
714 | return 0; | |
715 | } | |
716 | } | |
717 | ||
718 | dev_err(card->dev, "Too many groups assigned\n"); | |
719 | return -ENOSPC; | |
35f80014 | 720 | } |
6bbc7fed | 721 | EXPORT_SYMBOL_GPL(snd_card_add_dev_attr); |
9fb6198e | 722 | |
1da177e4 LT |
723 | /** |
724 | * snd_card_register - register the soundcard | |
725 | * @card: soundcard structure | |
726 | * | |
727 | * This function registers all the devices assigned to the soundcard. | |
728 | * Until calling this, the ALSA control interface is blocked from the | |
729 | * external accesses. Thus, you should call this function at the end | |
730 | * of the initialization of the card. | |
731 | * | |
eb7c06e8 | 732 | * Return: Zero otherwise a negative error code if the registration failed. |
1da177e4 | 733 | */ |
512bbd6a | 734 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
735 | { |
736 | int err; | |
1da177e4 | 737 | |
7eaa943c TI |
738 | if (snd_BUG_ON(!card)) |
739 | return -EINVAL; | |
39aba963 | 740 | |
8bfb181c TI |
741 | if (!card->registered) { |
742 | err = device_add(&card->card_dev); | |
743 | if (err < 0) | |
744 | return err; | |
745 | card->registered = true; | |
d80f19fa | 746 | } |
39aba963 | 747 | |
1da177e4 LT |
748 | if ((err = snd_device_register_all(card)) < 0) |
749 | return err; | |
746df948 | 750 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
751 | if (snd_cards[card->number]) { |
752 | /* already registered */ | |
746df948 | 753 | mutex_unlock(&snd_card_mutex); |
2471b6c8 | 754 | return snd_info_card_register(card); /* register pending info */ |
1da177e4 | 755 | } |
e7df2a3a TI |
756 | if (*card->id) { |
757 | /* make a unique id name from the given string */ | |
758 | char tmpid[sizeof(card->id)]; | |
759 | memcpy(tmpid, card->id, sizeof(card->id)); | |
760 | snd_card_set_id_no_lock(card, tmpid, tmpid); | |
761 | } else { | |
762 | /* create an id from either shortname or longname */ | |
763 | const char *src; | |
764 | src = *card->shortname ? card->shortname : card->longname; | |
765 | snd_card_set_id_no_lock(card, src, | |
766 | retrieve_id_from_card_name(src)); | |
767 | } | |
1da177e4 | 768 | snd_cards[card->number] = card; |
746df948 | 769 | mutex_unlock(&snd_card_mutex); |
e28563cc | 770 | init_info_for_card(card); |
8eeaa2f9 | 771 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
772 | if (snd_mixer_oss_notify_callback) |
773 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e | 774 | #endif |
1da177e4 LT |
775 | return 0; |
776 | } | |
c0d3fb39 TI |
777 | EXPORT_SYMBOL(snd_card_register); |
778 | ||
cd6a6503 | 779 | #ifdef CONFIG_SND_PROC_FS |
a381a7a6 TI |
780 | static void snd_card_info_read(struct snd_info_entry *entry, |
781 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
782 | { |
783 | int idx, count; | |
512bbd6a | 784 | struct snd_card *card; |
1da177e4 LT |
785 | |
786 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 787 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
788 | if ((card = snd_cards[idx]) != NULL) { |
789 | count++; | |
d001544d | 790 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
791 | idx, |
792 | card->id, | |
793 | card->driver, | |
794 | card->shortname); | |
d001544d | 795 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
796 | card->longname); |
797 | } | |
746df948 | 798 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
799 | } |
800 | if (!count) | |
801 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
802 | } | |
803 | ||
e28563cc | 804 | #ifdef CONFIG_SND_OSSEMUL |
512bbd6a | 805 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
806 | { |
807 | int idx, count; | |
512bbd6a | 808 | struct snd_card *card; |
1da177e4 LT |
809 | |
810 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 811 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
812 | if ((card = snd_cards[idx]) != NULL) { |
813 | count++; | |
814 | snd_iprintf(buffer, "%s\n", card->longname); | |
815 | } | |
746df948 | 816 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
817 | } |
818 | if (!count) { | |
819 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
820 | } | |
821 | } | |
822 | ||
823 | #endif | |
824 | ||
825 | #ifdef MODULE | |
512bbd6a TI |
826 | static void snd_card_module_info_read(struct snd_info_entry *entry, |
827 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
828 | { |
829 | int idx; | |
512bbd6a | 830 | struct snd_card *card; |
1da177e4 LT |
831 | |
832 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 833 | mutex_lock(&snd_card_mutex); |
1da177e4 | 834 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
835 | snd_iprintf(buffer, "%2i %s\n", |
836 | idx, card->module->name); | |
746df948 | 837 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
838 | } |
839 | } | |
840 | #endif | |
841 | ||
842 | int __init snd_card_info_init(void) | |
843 | { | |
512bbd6a | 844 | struct snd_info_entry *entry; |
1da177e4 LT |
845 | |
846 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
847 | if (! entry) |
848 | return -ENOMEM; | |
1da177e4 | 849 | entry->c.text.read = snd_card_info_read; |
b591b6e9 TI |
850 | if (snd_info_register(entry) < 0) |
851 | return -ENOMEM; /* freed in error path */ | |
1da177e4 LT |
852 | |
853 | #ifdef MODULE | |
854 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
b591b6e9 TI |
855 | if (!entry) |
856 | return -ENOMEM; | |
857 | entry->c.text.read = snd_card_module_info_read; | |
858 | if (snd_info_register(entry) < 0) | |
859 | return -ENOMEM; /* freed in error path */ | |
1da177e4 LT |
860 | #endif |
861 | ||
862 | return 0; | |
863 | } | |
cd6a6503 | 864 | #endif /* CONFIG_SND_PROC_FS */ |
e28563cc | 865 | |
1da177e4 LT |
866 | /** |
867 | * snd_component_add - add a component string | |
868 | * @card: soundcard structure | |
869 | * @component: the component id string | |
870 | * | |
871 | * This function adds the component id string to the supported list. | |
872 | * The component can be referred from the alsa-lib. | |
873 | * | |
eb7c06e8 | 874 | * Return: Zero otherwise a negative error code. |
1da177e4 LT |
875 | */ |
876 | ||
512bbd6a | 877 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
878 | { |
879 | char *ptr; | |
880 | int len = strlen(component); | |
881 | ||
882 | ptr = strstr(card->components, component); | |
883 | if (ptr != NULL) { | |
884 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
885 | return 1; | |
886 | } | |
887 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
888 | snd_BUG(); | |
889 | return -ENOMEM; | |
890 | } | |
891 | if (card->components[0] != '\0') | |
892 | strcat(card->components, " "); | |
893 | strcat(card->components, component); | |
894 | return 0; | |
895 | } | |
c0d3fb39 TI |
896 | EXPORT_SYMBOL(snd_component_add); |
897 | ||
1da177e4 LT |
898 | /** |
899 | * snd_card_file_add - add the file to the file list of the card | |
900 | * @card: soundcard structure | |
901 | * @file: file pointer | |
902 | * | |
903 | * This function adds the file to the file linked-list of the card. | |
904 | * This linked-list is used to keep tracking the connection state, | |
905 | * and to avoid the release of busy resources by hotplug. | |
906 | * | |
eb7c06e8 | 907 | * Return: zero or a negative error code. |
1da177e4 | 908 | */ |
512bbd6a | 909 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
910 | { |
911 | struct snd_monitor_file *mfile; | |
912 | ||
913 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
914 | if (mfile == NULL) | |
915 | return -ENOMEM; | |
916 | mfile->file = file; | |
a9edfc60 | 917 | mfile->disconnected_f_op = NULL; |
a45e3d6b | 918 | INIT_LIST_HEAD(&mfile->shutdown_list); |
1da177e4 LT |
919 | spin_lock(&card->files_lock); |
920 | if (card->shutdown) { | |
921 | spin_unlock(&card->files_lock); | |
922 | kfree(mfile); | |
923 | return -ENODEV; | |
924 | } | |
118dd6bf | 925 | list_add(&mfile->list, &card->files_list); |
f2464064 | 926 | get_device(&card->card_dev); |
1da177e4 LT |
927 | spin_unlock(&card->files_lock); |
928 | return 0; | |
929 | } | |
c0d3fb39 TI |
930 | EXPORT_SYMBOL(snd_card_file_add); |
931 | ||
1da177e4 LT |
932 | /** |
933 | * snd_card_file_remove - remove the file from the file list | |
934 | * @card: soundcard structure | |
935 | * @file: file pointer | |
936 | * | |
937 | * This function removes the file formerly added to the card via | |
938 | * snd_card_file_add() function. | |
2b29b13c TI |
939 | * If all files are removed and snd_card_free_when_closed() was |
940 | * called beforehand, it processes the pending release of | |
941 | * resources. | |
1da177e4 | 942 | * |
eb7c06e8 | 943 | * Return: Zero or a negative error code. |
1da177e4 | 944 | */ |
512bbd6a | 945 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 946 | { |
118dd6bf | 947 | struct snd_monitor_file *mfile, *found = NULL; |
1da177e4 LT |
948 | |
949 | spin_lock(&card->files_lock); | |
118dd6bf | 950 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 951 | if (mfile->file == file) { |
118dd6bf | 952 | list_del(&mfile->list); |
a45e3d6b TI |
953 | spin_lock(&shutdown_lock); |
954 | list_del(&mfile->shutdown_list); | |
955 | spin_unlock(&shutdown_lock); | |
118dd6bf TI |
956 | if (mfile->disconnected_f_op) |
957 | fops_put(mfile->disconnected_f_op); | |
958 | found = mfile; | |
1da177e4 LT |
959 | break; |
960 | } | |
a9edfc60 | 961 | } |
c461482c | 962 | spin_unlock(&card->files_lock); |
118dd6bf | 963 | if (!found) { |
f2f9307a | 964 | dev_err(card->dev, "card file remove problem (%p)\n", file); |
1da177e4 LT |
965 | return -ENOENT; |
966 | } | |
118dd6bf | 967 | kfree(found); |
f2464064 | 968 | put_device(&card->card_dev); |
1da177e4 LT |
969 | return 0; |
970 | } | |
c0d3fb39 TI |
971 | EXPORT_SYMBOL(snd_card_file_remove); |
972 | ||
1da177e4 LT |
973 | #ifdef CONFIG_PM |
974 | /** | |
975 | * snd_power_wait - wait until the power-state is changed. | |
976 | * @card: soundcard structure | |
977 | * @power_state: expected power state | |
1da177e4 LT |
978 | * |
979 | * Waits until the power-state is changed. | |
980 | * | |
eb7c06e8 YB |
981 | * Return: Zero if successful, or a negative error code. |
982 | * | |
1da177e4 LT |
983 | * Note: the power lock must be active before call. |
984 | */ | |
cbac4b0c | 985 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 | 986 | { |
ac6424b9 | 987 | wait_queue_entry_t wait; |
1da177e4 LT |
988 | int result = 0; |
989 | ||
990 | /* fastpath */ | |
991 | if (snd_power_get_state(card) == power_state) | |
992 | return 0; | |
993 | init_waitqueue_entry(&wait, current); | |
994 | add_wait_queue(&card->power_sleep, &wait); | |
995 | while (1) { | |
996 | if (card->shutdown) { | |
997 | result = -ENODEV; | |
998 | break; | |
999 | } | |
1000 | if (snd_power_get_state(card) == power_state) | |
1001 | break; | |
1da177e4 LT |
1002 | set_current_state(TASK_UNINTERRUPTIBLE); |
1003 | snd_power_unlock(card); | |
1004 | schedule_timeout(30 * HZ); | |
1005 | snd_power_lock(card); | |
1006 | } | |
1007 | remove_wait_queue(&card->power_sleep, &wait); | |
1008 | return result; | |
1009 | } | |
c0d3fb39 | 1010 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 1011 | #endif /* CONFIG_PM */ |