Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ALSA sequencer device management | |
3 | * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * | |
20 | *---------------------------------------------------------------- | |
21 | * | |
22 | * This device handler separates the card driver module from sequencer | |
23 | * stuff (sequencer core, synth drivers, etc), so that user can avoid | |
24 | * to spend unnecessary resources e.g. if he needs only listening to | |
25 | * MP3s. | |
26 | * | |
27 | * The card (or lowlevel) driver creates a sequencer device entry | |
28 | * via snd_seq_device_new(). This is an entry pointer to communicate | |
29 | * with the sequencer device "driver", which is involved with the | |
30 | * actual part to communicate with the sequencer core. | |
31 | * Each sequencer device entry has an id string and the corresponding | |
32 | * driver with the same id is loaded when required. For example, | |
33 | * lowlevel codes to access emu8000 chip on sbawe card are included in | |
34 | * emu8000-synth module. To activate this module, the hardware | |
35 | * resources like i/o port are passed via snd_seq_device argument. | |
36 | * | |
37 | */ | |
38 | ||
1da177e4 | 39 | #include <linux/init.h> |
da155d5b | 40 | #include <linux/module.h> |
1da177e4 LT |
41 | #include <sound/core.h> |
42 | #include <sound/info.h> | |
43 | #include <sound/seq_device.h> | |
44 | #include <sound/seq_kernel.h> | |
45 | #include <sound/initval.h> | |
46 | #include <linux/kmod.h> | |
47 | #include <linux/slab.h> | |
1a60d4c5 | 48 | #include <linux/mutex.h> |
1da177e4 LT |
49 | |
50 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); | |
51 | MODULE_DESCRIPTION("ALSA sequencer device management"); | |
52 | MODULE_LICENSE("GPL"); | |
53 | ||
1da177e4 LT |
54 | /* driver state */ |
55 | #define DRIVER_EMPTY 0 | |
56 | #define DRIVER_LOADED (1<<0) | |
57 | #define DRIVER_REQUESTED (1<<1) | |
58 | #define DRIVER_LOCKED (1<<2) | |
68ab6108 | 59 | #define DRIVER_REQUESTING (1<<3) |
1da177e4 LT |
60 | |
61 | struct ops_list { | |
62 | char id[ID_LEN]; /* driver id */ | |
63 | int driver; /* driver state */ | |
64 | int used; /* reference counter */ | |
65 | int argsize; /* argument size */ | |
66 | ||
67 | /* operators */ | |
c7e0b5bf | 68 | struct snd_seq_dev_ops ops; |
1da177e4 | 69 | |
d93cf068 | 70 | /* registered devices */ |
1da177e4 LT |
71 | struct list_head dev_list; /* list of devices */ |
72 | int num_devices; /* number of associated devices */ | |
73 | int num_init_devices; /* number of initialized devices */ | |
1a60d4c5 | 74 | struct mutex reg_mutex; |
1da177e4 LT |
75 | |
76 | struct list_head list; /* next driver */ | |
77 | }; | |
78 | ||
79 | ||
80 | static LIST_HEAD(opslist); | |
81 | static int num_ops; | |
1a60d4c5 | 82 | static DEFINE_MUTEX(ops_mutex); |
04f141a8 | 83 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 84 | static struct snd_info_entry *info_entry; |
04f141a8 | 85 | #endif |
1da177e4 LT |
86 | |
87 | /* | |
88 | * prototypes | |
89 | */ | |
c7e0b5bf TI |
90 | static int snd_seq_device_free(struct snd_seq_device *dev); |
91 | static int snd_seq_device_dev_free(struct snd_device *device); | |
92 | static int snd_seq_device_dev_register(struct snd_device *device); | |
93 | static int snd_seq_device_dev_disconnect(struct snd_device *device); | |
c7e0b5bf TI |
94 | |
95 | static int init_device(struct snd_seq_device *dev, struct ops_list *ops); | |
96 | static int free_device(struct snd_seq_device *dev, struct ops_list *ops); | |
97 | static struct ops_list *find_driver(char *id, int create_if_empty); | |
98 | static struct ops_list *create_driver(char *id); | |
99 | static void unlock_driver(struct ops_list *ops); | |
1da177e4 LT |
100 | static void remove_drivers(void); |
101 | ||
102 | /* | |
103 | * show all drivers and their status | |
104 | */ | |
105 | ||
04f141a8 | 106 | #ifdef CONFIG_PROC_FS |
c7e0b5bf TI |
107 | static void snd_seq_device_info(struct snd_info_entry *entry, |
108 | struct snd_info_buffer *buffer) | |
1da177e4 | 109 | { |
9244b2c3 | 110 | struct ops_list *ops; |
1da177e4 | 111 | |
1a60d4c5 | 112 | mutex_lock(&ops_mutex); |
9244b2c3 | 113 | list_for_each_entry(ops, &opslist, list) { |
1da177e4 LT |
114 | snd_iprintf(buffer, "snd-%s%s%s%s,%d\n", |
115 | ops->id, | |
116 | ops->driver & DRIVER_LOADED ? ",loaded" : (ops->driver == DRIVER_EMPTY ? ",empty" : ""), | |
117 | ops->driver & DRIVER_REQUESTED ? ",requested" : "", | |
118 | ops->driver & DRIVER_LOCKED ? ",locked" : "", | |
119 | ops->num_devices); | |
120 | } | |
1a60d4c5 | 121 | mutex_unlock(&ops_mutex); |
1da177e4 | 122 | } |
04f141a8 | 123 | #endif |
1da177e4 LT |
124 | |
125 | /* | |
126 | * load all registered drivers (called from seq_clientmgr.c) | |
127 | */ | |
128 | ||
ee2da997 | 129 | #ifdef CONFIG_MODULES |
1da177e4 | 130 | /* avoid auto-loading during module_init() */ |
68ab6108 | 131 | static atomic_t snd_seq_in_init = ATOMIC_INIT(1); /* blocked as default */ |
1da177e4 LT |
132 | void snd_seq_autoload_lock(void) |
133 | { | |
54841a06 | 134 | atomic_inc(&snd_seq_in_init); |
1da177e4 | 135 | } |
b6a42670 | 136 | EXPORT_SYMBOL(snd_seq_autoload_lock); |
1da177e4 LT |
137 | |
138 | void snd_seq_autoload_unlock(void) | |
139 | { | |
54841a06 | 140 | atomic_dec(&snd_seq_in_init); |
1da177e4 | 141 | } |
b6a42670 | 142 | EXPORT_SYMBOL(snd_seq_autoload_unlock); |
1da177e4 | 143 | |
68ab6108 | 144 | static void autoload_drivers(void) |
1da177e4 | 145 | { |
68ab6108 TI |
146 | /* avoid reentrance */ |
147 | if (atomic_inc_return(&snd_seq_in_init) == 1) { | |
148 | struct ops_list *ops; | |
149 | ||
150 | mutex_lock(&ops_mutex); | |
151 | list_for_each_entry(ops, &opslist, list) { | |
152 | if ((ops->driver & DRIVER_REQUESTING) && | |
153 | !(ops->driver & DRIVER_REQUESTED)) { | |
154 | ops->used++; | |
155 | mutex_unlock(&ops_mutex); | |
156 | ops->driver |= DRIVER_REQUESTED; | |
157 | request_module("snd-%s", ops->id); | |
158 | mutex_lock(&ops_mutex); | |
159 | ops->used--; | |
160 | } | |
161 | } | |
162 | mutex_unlock(&ops_mutex); | |
163 | } | |
164 | atomic_dec(&snd_seq_in_init); | |
165 | } | |
1da177e4 | 166 | |
68ab6108 TI |
167 | static void call_autoload(struct work_struct *work) |
168 | { | |
169 | autoload_drivers(); | |
170 | } | |
1da177e4 | 171 | |
68ab6108 TI |
172 | static DECLARE_WORK(autoload_work, call_autoload); |
173 | ||
174 | static void try_autoload(struct ops_list *ops) | |
175 | { | |
176 | if (!ops->driver) { | |
177 | ops->driver |= DRIVER_REQUESTING; | |
178 | schedule_work(&autoload_work); | |
1da177e4 | 179 | } |
68ab6108 TI |
180 | } |
181 | ||
182 | static void queue_autoload_drivers(void) | |
183 | { | |
184 | struct ops_list *ops; | |
185 | ||
186 | mutex_lock(&ops_mutex); | |
187 | list_for_each_entry(ops, &opslist, list) | |
188 | try_autoload(ops); | |
1a60d4c5 | 189 | mutex_unlock(&ops_mutex); |
68ab6108 TI |
190 | } |
191 | ||
192 | void snd_seq_autoload_init(void) | |
193 | { | |
194 | atomic_dec(&snd_seq_in_init); | |
195 | #ifdef CONFIG_SND_SEQUENCER_MODULE | |
196 | /* initial autoload only when snd-seq is a module */ | |
197 | queue_autoload_drivers(); | |
198 | #endif | |
199 | } | |
b6a42670 | 200 | EXPORT_SYMBOL(snd_seq_autoload_init); |
68ab6108 TI |
201 | #else |
202 | #define try_autoload(ops) /* NOP */ | |
203 | #endif | |
204 | ||
b6a42670 | 205 | |
68ab6108 TI |
206 | void snd_seq_device_load_drivers(void) |
207 | { | |
208 | #ifdef CONFIG_MODULES | |
209 | queue_autoload_drivers(); | |
210 | flush_work(&autoload_work); | |
1da177e4 LT |
211 | #endif |
212 | } | |
b6a42670 | 213 | EXPORT_SYMBOL(snd_seq_device_load_drivers); |
1da177e4 LT |
214 | |
215 | /* | |
216 | * register a sequencer device | |
f2f9307a | 217 | * card = card info |
1da177e4 LT |
218 | * device = device number (if any) |
219 | * id = id of driver | |
220 | * result = return pointer (NULL allowed if unnecessary) | |
221 | */ | |
c7e0b5bf TI |
222 | int snd_seq_device_new(struct snd_card *card, int device, char *id, int argsize, |
223 | struct snd_seq_device **result) | |
1da177e4 | 224 | { |
c7e0b5bf TI |
225 | struct snd_seq_device *dev; |
226 | struct ops_list *ops; | |
1da177e4 | 227 | int err; |
c7e0b5bf | 228 | static struct snd_device_ops dops = { |
1da177e4 LT |
229 | .dev_free = snd_seq_device_dev_free, |
230 | .dev_register = snd_seq_device_dev_register, | |
231 | .dev_disconnect = snd_seq_device_dev_disconnect, | |
1da177e4 LT |
232 | }; |
233 | ||
234 | if (result) | |
235 | *result = NULL; | |
236 | ||
7eaa943c TI |
237 | if (snd_BUG_ON(!id)) |
238 | return -EINVAL; | |
1da177e4 LT |
239 | |
240 | ops = find_driver(id, 1); | |
241 | if (ops == NULL) | |
242 | return -ENOMEM; | |
243 | ||
ecca82b4 | 244 | dev = kzalloc(sizeof(*dev)*2 + argsize, GFP_KERNEL); |
1da177e4 LT |
245 | if (dev == NULL) { |
246 | unlock_driver(ops); | |
247 | return -ENOMEM; | |
248 | } | |
249 | ||
250 | /* set up device info */ | |
251 | dev->card = card; | |
252 | dev->device = device; | |
253 | strlcpy(dev->id, id, sizeof(dev->id)); | |
254 | dev->argsize = argsize; | |
255 | dev->status = SNDRV_SEQ_DEVICE_FREE; | |
256 | ||
257 | /* add this device to the list */ | |
1a60d4c5 | 258 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
259 | list_add_tail(&dev->list, &ops->dev_list); |
260 | ops->num_devices++; | |
1a60d4c5 | 261 | mutex_unlock(&ops->reg_mutex); |
1da177e4 | 262 | |
1da177e4 LT |
263 | if ((err = snd_device_new(card, SNDRV_DEV_SEQUENCER, dev, &dops)) < 0) { |
264 | snd_seq_device_free(dev); | |
265 | return err; | |
266 | } | |
267 | ||
68ab6108 TI |
268 | try_autoload(ops); |
269 | unlock_driver(ops); | |
270 | ||
1da177e4 LT |
271 | if (result) |
272 | *result = dev; | |
273 | ||
274 | return 0; | |
275 | } | |
b6a42670 | 276 | EXPORT_SYMBOL(snd_seq_device_new); |
1da177e4 LT |
277 | |
278 | /* | |
279 | * free the existing device | |
280 | */ | |
c7e0b5bf | 281 | static int snd_seq_device_free(struct snd_seq_device *dev) |
1da177e4 | 282 | { |
c7e0b5bf | 283 | struct ops_list *ops; |
1da177e4 | 284 | |
7eaa943c TI |
285 | if (snd_BUG_ON(!dev)) |
286 | return -EINVAL; | |
1da177e4 LT |
287 | |
288 | ops = find_driver(dev->id, 0); | |
289 | if (ops == NULL) | |
290 | return -ENXIO; | |
291 | ||
292 | /* remove the device from the list */ | |
1a60d4c5 | 293 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
294 | list_del(&dev->list); |
295 | ops->num_devices--; | |
1a60d4c5 | 296 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
297 | |
298 | free_device(dev, ops); | |
299 | if (dev->private_free) | |
300 | dev->private_free(dev); | |
301 | kfree(dev); | |
302 | ||
303 | unlock_driver(ops); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
c7e0b5bf | 308 | static int snd_seq_device_dev_free(struct snd_device *device) |
1da177e4 | 309 | { |
c7e0b5bf | 310 | struct snd_seq_device *dev = device->device_data; |
1da177e4 LT |
311 | return snd_seq_device_free(dev); |
312 | } | |
313 | ||
314 | /* | |
315 | * register the device | |
316 | */ | |
c7e0b5bf | 317 | static int snd_seq_device_dev_register(struct snd_device *device) |
1da177e4 | 318 | { |
c7e0b5bf TI |
319 | struct snd_seq_device *dev = device->device_data; |
320 | struct ops_list *ops; | |
1da177e4 LT |
321 | |
322 | ops = find_driver(dev->id, 0); | |
323 | if (ops == NULL) | |
324 | return -ENOENT; | |
325 | ||
326 | /* initialize this device if the corresponding driver was | |
327 | * already loaded | |
328 | */ | |
329 | if (ops->driver & DRIVER_LOADED) | |
330 | init_device(dev, ops); | |
331 | ||
332 | unlock_driver(ops); | |
333 | return 0; | |
334 | } | |
b6a42670 | 335 | EXPORT_SYMBOL(snd_seq_device_register_driver); |
1da177e4 LT |
336 | |
337 | /* | |
338 | * disconnect the device | |
339 | */ | |
c7e0b5bf | 340 | static int snd_seq_device_dev_disconnect(struct snd_device *device) |
1da177e4 | 341 | { |
c7e0b5bf TI |
342 | struct snd_seq_device *dev = device->device_data; |
343 | struct ops_list *ops; | |
1da177e4 LT |
344 | |
345 | ops = find_driver(dev->id, 0); | |
346 | if (ops == NULL) | |
347 | return -ENOENT; | |
348 | ||
349 | free_device(dev, ops); | |
350 | ||
351 | unlock_driver(ops); | |
352 | return 0; | |
353 | } | |
b6a42670 | 354 | EXPORT_SYMBOL(snd_seq_device_unregister_driver); |
1da177e4 | 355 | |
1da177e4 LT |
356 | /* |
357 | * register device driver | |
358 | * id = driver id | |
359 | * entry = driver operators - duplicated to each instance | |
360 | */ | |
c7e0b5bf TI |
361 | int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry, |
362 | int argsize) | |
1da177e4 | 363 | { |
c7e0b5bf | 364 | struct ops_list *ops; |
9244b2c3 | 365 | struct snd_seq_device *dev; |
1da177e4 LT |
366 | |
367 | if (id == NULL || entry == NULL || | |
368 | entry->init_device == NULL || entry->free_device == NULL) | |
369 | return -EINVAL; | |
370 | ||
1da177e4 | 371 | ops = find_driver(id, 1); |
d5129f33 | 372 | if (ops == NULL) |
1da177e4 | 373 | return -ENOMEM; |
1da177e4 | 374 | if (ops->driver & DRIVER_LOADED) { |
04cc79a0 | 375 | pr_warn("ALSA: seq: driver_register: driver '%s' already exists\n", id); |
1da177e4 | 376 | unlock_driver(ops); |
1da177e4 LT |
377 | return -EBUSY; |
378 | } | |
379 | ||
1a60d4c5 | 380 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
381 | /* copy driver operators */ |
382 | ops->ops = *entry; | |
383 | ops->driver |= DRIVER_LOADED; | |
384 | ops->argsize = argsize; | |
385 | ||
386 | /* initialize existing devices if necessary */ | |
9244b2c3 | 387 | list_for_each_entry(dev, &ops->dev_list, list) { |
1da177e4 LT |
388 | init_device(dev, ops); |
389 | } | |
1a60d4c5 | 390 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
391 | |
392 | unlock_driver(ops); | |
1da177e4 LT |
393 | |
394 | return 0; | |
395 | } | |
396 | ||
397 | ||
398 | /* | |
399 | * create driver record | |
400 | */ | |
c7e0b5bf | 401 | static struct ops_list * create_driver(char *id) |
1da177e4 | 402 | { |
c7e0b5bf | 403 | struct ops_list *ops; |
1da177e4 | 404 | |
59feddb2 | 405 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); |
1da177e4 LT |
406 | if (ops == NULL) |
407 | return ops; | |
1da177e4 LT |
408 | |
409 | /* set up driver entry */ | |
410 | strlcpy(ops->id, id, sizeof(ops->id)); | |
1a60d4c5 | 411 | mutex_init(&ops->reg_mutex); |
933a2efc AV |
412 | /* |
413 | * The ->reg_mutex locking rules are per-driver, so we create | |
414 | * separate per-driver lock classes: | |
415 | */ | |
416 | lockdep_set_class(&ops->reg_mutex, (struct lock_class_key *)id); | |
417 | ||
1da177e4 LT |
418 | ops->driver = DRIVER_EMPTY; |
419 | INIT_LIST_HEAD(&ops->dev_list); | |
420 | /* lock this instance */ | |
421 | ops->used = 1; | |
422 | ||
423 | /* register driver entry */ | |
1a60d4c5 | 424 | mutex_lock(&ops_mutex); |
1da177e4 LT |
425 | list_add_tail(&ops->list, &opslist); |
426 | num_ops++; | |
1a60d4c5 | 427 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
428 | |
429 | return ops; | |
430 | } | |
431 | ||
432 | ||
433 | /* | |
434 | * unregister the specified driver | |
435 | */ | |
436 | int snd_seq_device_unregister_driver(char *id) | |
437 | { | |
c7e0b5bf | 438 | struct ops_list *ops; |
9244b2c3 | 439 | struct snd_seq_device *dev; |
1da177e4 LT |
440 | |
441 | ops = find_driver(id, 0); | |
442 | if (ops == NULL) | |
443 | return -ENXIO; | |
444 | if (! (ops->driver & DRIVER_LOADED) || | |
445 | (ops->driver & DRIVER_LOCKED)) { | |
04cc79a0 | 446 | pr_err("ALSA: seq: driver_unregister: cannot unload driver '%s': status=%x\n", |
c7e0b5bf | 447 | id, ops->driver); |
1da177e4 LT |
448 | unlock_driver(ops); |
449 | return -EBUSY; | |
450 | } | |
451 | ||
452 | /* close and release all devices associated with this driver */ | |
1a60d4c5 | 453 | mutex_lock(&ops->reg_mutex); |
1da177e4 | 454 | ops->driver |= DRIVER_LOCKED; /* do not remove this driver recursively */ |
9244b2c3 | 455 | list_for_each_entry(dev, &ops->dev_list, list) { |
1da177e4 LT |
456 | free_device(dev, ops); |
457 | } | |
458 | ||
459 | ops->driver = 0; | |
460 | if (ops->num_init_devices > 0) | |
04cc79a0 | 461 | pr_err("ALSA: seq: free_driver: init_devices > 0!! (%d)\n", |
c7e0b5bf | 462 | ops->num_init_devices); |
1a60d4c5 | 463 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
464 | |
465 | unlock_driver(ops); | |
466 | ||
467 | /* remove empty driver entries */ | |
468 | remove_drivers(); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | ||
474 | /* | |
475 | * remove empty driver entries | |
476 | */ | |
477 | static void remove_drivers(void) | |
478 | { | |
479 | struct list_head *head; | |
480 | ||
1a60d4c5 | 481 | mutex_lock(&ops_mutex); |
1da177e4 LT |
482 | head = opslist.next; |
483 | while (head != &opslist) { | |
c7e0b5bf | 484 | struct ops_list *ops = list_entry(head, struct ops_list, list); |
1da177e4 LT |
485 | if (! (ops->driver & DRIVER_LOADED) && |
486 | ops->used == 0 && ops->num_devices == 0) { | |
487 | head = head->next; | |
488 | list_del(&ops->list); | |
489 | kfree(ops); | |
490 | num_ops--; | |
491 | } else | |
492 | head = head->next; | |
493 | } | |
1a60d4c5 | 494 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
495 | } |
496 | ||
497 | /* | |
498 | * initialize the device - call init_device operator | |
499 | */ | |
c7e0b5bf | 500 | static int init_device(struct snd_seq_device *dev, struct ops_list *ops) |
1da177e4 LT |
501 | { |
502 | if (! (ops->driver & DRIVER_LOADED)) | |
503 | return 0; /* driver is not loaded yet */ | |
504 | if (dev->status != SNDRV_SEQ_DEVICE_FREE) | |
505 | return 0; /* already initialized */ | |
506 | if (ops->argsize != dev->argsize) { | |
04cc79a0 | 507 | pr_err("ALSA: seq: incompatible device '%s' for plug-in '%s' (%d %d)\n", |
c7e0b5bf | 508 | dev->name, ops->id, ops->argsize, dev->argsize); |
1da177e4 LT |
509 | return -EINVAL; |
510 | } | |
511 | if (ops->ops.init_device(dev) >= 0) { | |
512 | dev->status = SNDRV_SEQ_DEVICE_REGISTERED; | |
513 | ops->num_init_devices++; | |
514 | } else { | |
04cc79a0 | 515 | pr_err("ALSA: seq: init_device failed: %s: %s\n", |
c7e0b5bf | 516 | dev->name, dev->id); |
1da177e4 LT |
517 | } |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | /* | |
523 | * release the device - call free_device operator | |
524 | */ | |
c7e0b5bf | 525 | static int free_device(struct snd_seq_device *dev, struct ops_list *ops) |
1da177e4 LT |
526 | { |
527 | int result; | |
528 | ||
529 | if (! (ops->driver & DRIVER_LOADED)) | |
530 | return 0; /* driver is not loaded yet */ | |
531 | if (dev->status != SNDRV_SEQ_DEVICE_REGISTERED) | |
532 | return 0; /* not registered */ | |
533 | if (ops->argsize != dev->argsize) { | |
04cc79a0 | 534 | pr_err("ALSA: seq: incompatible device '%s' for plug-in '%s' (%d %d)\n", |
c7e0b5bf | 535 | dev->name, ops->id, ops->argsize, dev->argsize); |
1da177e4 LT |
536 | return -EINVAL; |
537 | } | |
538 | if ((result = ops->ops.free_device(dev)) >= 0 || result == -ENXIO) { | |
539 | dev->status = SNDRV_SEQ_DEVICE_FREE; | |
540 | dev->driver_data = NULL; | |
541 | ops->num_init_devices--; | |
542 | } else { | |
04cc79a0 | 543 | pr_err("ALSA: seq: free_device failed: %s: %s\n", |
c7e0b5bf | 544 | dev->name, dev->id); |
1da177e4 LT |
545 | } |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | /* | |
551 | * find the matching driver with given id | |
552 | */ | |
c7e0b5bf | 553 | static struct ops_list * find_driver(char *id, int create_if_empty) |
1da177e4 | 554 | { |
9244b2c3 | 555 | struct ops_list *ops; |
1da177e4 | 556 | |
1a60d4c5 | 557 | mutex_lock(&ops_mutex); |
9244b2c3 | 558 | list_for_each_entry(ops, &opslist, list) { |
1da177e4 LT |
559 | if (strcmp(ops->id, id) == 0) { |
560 | ops->used++; | |
1a60d4c5 | 561 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
562 | return ops; |
563 | } | |
564 | } | |
1a60d4c5 | 565 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
566 | if (create_if_empty) |
567 | return create_driver(id); | |
568 | return NULL; | |
569 | } | |
570 | ||
c7e0b5bf | 571 | static void unlock_driver(struct ops_list *ops) |
1da177e4 | 572 | { |
1a60d4c5 | 573 | mutex_lock(&ops_mutex); |
1da177e4 | 574 | ops->used--; |
1a60d4c5 | 575 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
576 | } |
577 | ||
578 | ||
579 | /* | |
580 | * module part | |
581 | */ | |
582 | ||
583 | static int __init alsa_seq_device_init(void) | |
584 | { | |
04f141a8 | 585 | #ifdef CONFIG_PROC_FS |
c7e0b5bf TI |
586 | info_entry = snd_info_create_module_entry(THIS_MODULE, "drivers", |
587 | snd_seq_root); | |
1da177e4 LT |
588 | if (info_entry == NULL) |
589 | return -ENOMEM; | |
590 | info_entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1da177e4 LT |
591 | info_entry->c.text.read = snd_seq_device_info; |
592 | if (snd_info_register(info_entry) < 0) { | |
593 | snd_info_free_entry(info_entry); | |
594 | return -ENOMEM; | |
595 | } | |
04f141a8 | 596 | #endif |
1da177e4 LT |
597 | return 0; |
598 | } | |
599 | ||
600 | static void __exit alsa_seq_device_exit(void) | |
601 | { | |
68ab6108 TI |
602 | #ifdef CONFIG_MODULES |
603 | cancel_work_sync(&autoload_work); | |
604 | #endif | |
1da177e4 | 605 | remove_drivers(); |
04f141a8 | 606 | #ifdef CONFIG_PROC_FS |
746d4a02 | 607 | snd_info_free_entry(info_entry); |
04f141a8 | 608 | #endif |
1da177e4 | 609 | if (num_ops) |
04cc79a0 | 610 | pr_err("ALSA: seq: drivers not released (%d)\n", num_ops); |
1da177e4 LT |
611 | } |
612 | ||
613 | module_init(alsa_seq_device_init) | |
614 | module_exit(alsa_seq_device_exit) |