Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Advanced Linux Sound Architecture | |
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/slab.h> | |
24 | #include <linux/time.h> | |
9a1a2a1d | 25 | #include <linux/device.h> |
65a77217 | 26 | #include <linux/module.h> |
1da177e4 LT |
27 | #include <sound/core.h> |
28 | #include <sound/minors.h> | |
29 | #include <sound/info.h> | |
30 | #include <sound/version.h> | |
31 | #include <sound/control.h> | |
32 | #include <sound/initval.h> | |
33 | #include <linux/kmod.h> | |
1a60d4c5 | 34 | #include <linux/mutex.h> |
1da177e4 | 35 | |
1da177e4 LT |
36 | static int major = CONFIG_SND_MAJOR; |
37 | int snd_major; | |
c0d3fb39 TI |
38 | EXPORT_SYMBOL(snd_major); |
39 | ||
1da177e4 | 40 | static int cards_limit = 1; |
1da177e4 | 41 | |
c1017a4c | 42 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); |
1da177e4 LT |
43 | MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards."); |
44 | MODULE_LICENSE("GPL"); | |
45 | module_param(major, int, 0444); | |
46 | MODULE_PARM_DESC(major, "Major # for sound driver."); | |
47 | module_param(cards_limit, int, 0444); | |
48 | MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards."); | |
1da177e4 LT |
49 | MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR); |
50 | ||
51 | /* this one holds the actual max. card number currently available. | |
52 | * as default, it's identical with cards_limit option. when more | |
53 | * modules are loaded manually, this limit number increases, too. | |
54 | */ | |
55 | int snd_ecards_limit; | |
c0d3fb39 | 56 | EXPORT_SYMBOL(snd_ecards_limit); |
1da177e4 | 57 | |
6983b724 | 58 | static struct snd_minor *snd_minors[SNDRV_OS_MINORS]; |
1a60d4c5 | 59 | static DEFINE_MUTEX(sound_mutex); |
1da177e4 | 60 | |
ee2da997 | 61 | #ifdef CONFIG_MODULES |
1da177e4 LT |
62 | |
63 | /** | |
64 | * snd_request_card - try to load the card module | |
65 | * @card: the card number | |
66 | * | |
67 | * Tries to load the module "snd-card-X" for the given card number | |
ee2da997 | 68 | * via request_module. Returns immediately if already loaded. |
1da177e4 LT |
69 | */ |
70 | void snd_request_card(int card) | |
71 | { | |
746df948 | 72 | if (snd_card_locked(card)) |
1da177e4 LT |
73 | return; |
74 | if (card < 0 || card >= cards_limit) | |
75 | return; | |
76 | request_module("snd-card-%i", card); | |
77 | } | |
78 | ||
c0d3fb39 TI |
79 | EXPORT_SYMBOL(snd_request_card); |
80 | ||
1da177e4 LT |
81 | static void snd_request_other(int minor) |
82 | { | |
83 | char *str; | |
84 | ||
1da177e4 LT |
85 | switch (minor) { |
86 | case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break; | |
87 | case SNDRV_MINOR_TIMER: str = "snd-timer"; break; | |
88 | default: return; | |
89 | } | |
90 | request_module(str); | |
91 | } | |
92 | ||
ee2da997 | 93 | #endif /* modular kernel */ |
1da177e4 | 94 | |
f87135f5 CL |
95 | /** |
96 | * snd_lookup_minor_data - get user data of a registered device | |
97 | * @minor: the minor number | |
98 | * @type: device type (SNDRV_DEVICE_TYPE_XXX) | |
99 | * | |
100 | * Checks that a minor device with the specified type is registered, and returns | |
101 | * its user data pointer. | |
102 | */ | |
103 | void *snd_lookup_minor_data(unsigned int minor, int type) | |
104 | { | |
105 | struct snd_minor *mreg; | |
106 | void *private_data; | |
107 | ||
3a63e444 | 108 | if (minor >= ARRAY_SIZE(snd_minors)) |
f87135f5 | 109 | return NULL; |
1a60d4c5 | 110 | mutex_lock(&sound_mutex); |
f87135f5 CL |
111 | mreg = snd_minors[minor]; |
112 | if (mreg && mreg->type == type) | |
113 | private_data = mreg->private_data; | |
114 | else | |
115 | private_data = NULL; | |
1a60d4c5 | 116 | mutex_unlock(&sound_mutex); |
f87135f5 CL |
117 | return private_data; |
118 | } | |
119 | ||
c0d3fb39 TI |
120 | EXPORT_SYMBOL(snd_lookup_minor_data); |
121 | ||
4cf19b84 TI |
122 | #ifdef CONFIG_MODULES |
123 | static struct snd_minor *autoload_device(unsigned int minor) | |
124 | { | |
125 | int dev; | |
126 | mutex_unlock(&sound_mutex); /* release lock temporarily */ | |
127 | dev = SNDRV_MINOR_DEVICE(minor); | |
128 | if (dev == SNDRV_MINOR_CONTROL) { | |
129 | /* /dev/aloadC? */ | |
130 | int card = SNDRV_MINOR_CARD(minor); | |
131 | if (snd_cards[card] == NULL) | |
132 | snd_request_card(card); | |
133 | } else if (dev == SNDRV_MINOR_GLOBAL) { | |
134 | /* /dev/aloadSEQ */ | |
135 | snd_request_other(minor); | |
136 | } | |
137 | mutex_lock(&sound_mutex); /* reacuire lock */ | |
138 | return snd_minors[minor]; | |
139 | } | |
140 | #else /* !CONFIG_MODULES */ | |
141 | #define autoload_device(minor) NULL | |
142 | #endif /* CONFIG_MODULES */ | |
143 | ||
144 | static int snd_open(struct inode *inode, struct file *file) | |
1da177e4 | 145 | { |
332682b1 | 146 | unsigned int minor = iminor(inode); |
512bbd6a | 147 | struct snd_minor *mptr = NULL; |
99ac48f5 | 148 | const struct file_operations *old_fops; |
1da177e4 LT |
149 | int err = 0; |
150 | ||
3a63e444 | 151 | if (minor >= ARRAY_SIZE(snd_minors)) |
332682b1 | 152 | return -ENODEV; |
4cf19b84 | 153 | mutex_lock(&sound_mutex); |
332682b1 CL |
154 | mptr = snd_minors[minor]; |
155 | if (mptr == NULL) { | |
4cf19b84 TI |
156 | mptr = autoload_device(minor); |
157 | if (!mptr) { | |
158 | mutex_unlock(&sound_mutex); | |
332682b1 | 159 | return -ENODEV; |
4cf19b84 | 160 | } |
1da177e4 | 161 | } |
1da177e4 LT |
162 | old_fops = file->f_op; |
163 | file->f_op = fops_get(mptr->f_ops); | |
f41ced8f LP |
164 | if (file->f_op == NULL) { |
165 | file->f_op = old_fops; | |
4cf19b84 | 166 | err = -ENODEV; |
f41ced8f | 167 | } |
4cf19b84 TI |
168 | mutex_unlock(&sound_mutex); |
169 | if (err < 0) | |
170 | return err; | |
171 | ||
172 | if (file->f_op->open) { | |
1da177e4 | 173 | err = file->f_op->open(inode, file); |
4cf19b84 TI |
174 | if (err) { |
175 | fops_put(file->f_op); | |
176 | file->f_op = fops_get(old_fops); | |
177 | } | |
1da177e4 LT |
178 | } |
179 | fops_put(old_fops); | |
180 | return err; | |
181 | } | |
182 | ||
9c2e08c5 | 183 | static const struct file_operations snd_fops = |
1da177e4 LT |
184 | { |
185 | .owner = THIS_MODULE, | |
6038f373 AB |
186 | .open = snd_open, |
187 | .llseek = noop_llseek, | |
1da177e4 LT |
188 | }; |
189 | ||
332682b1 | 190 | #ifdef CONFIG_SND_DYNAMIC_MINORS |
03cfe6f5 | 191 | static int snd_find_free_minor(int type) |
332682b1 CL |
192 | { |
193 | int minor; | |
194 | ||
03cfe6f5 KS |
195 | /* static minors for module auto loading */ |
196 | if (type == SNDRV_DEVICE_TYPE_SEQUENCER) | |
197 | return SNDRV_MINOR_SEQUENCER; | |
198 | if (type == SNDRV_DEVICE_TYPE_TIMER) | |
199 | return SNDRV_MINOR_TIMER; | |
200 | ||
332682b1 | 201 | for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) { |
03cfe6f5 KS |
202 | /* skip static minors still used for module auto loading */ |
203 | if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL) | |
204 | continue; | |
205 | if (minor == SNDRV_MINOR_SEQUENCER || | |
206 | minor == SNDRV_MINOR_TIMER) | |
332682b1 CL |
207 | continue; |
208 | if (!snd_minors[minor]) | |
209 | return minor; | |
210 | } | |
211 | return -EBUSY; | |
212 | } | |
213 | #else | |
512bbd6a | 214 | static int snd_kernel_minor(int type, struct snd_card *card, int dev) |
1da177e4 LT |
215 | { |
216 | int minor; | |
217 | ||
218 | switch (type) { | |
219 | case SNDRV_DEVICE_TYPE_SEQUENCER: | |
220 | case SNDRV_DEVICE_TYPE_TIMER: | |
221 | minor = type; | |
222 | break; | |
223 | case SNDRV_DEVICE_TYPE_CONTROL: | |
7eaa943c TI |
224 | if (snd_BUG_ON(!card)) |
225 | return -EINVAL; | |
1da177e4 LT |
226 | minor = SNDRV_MINOR(card->number, type); |
227 | break; | |
228 | case SNDRV_DEVICE_TYPE_HWDEP: | |
229 | case SNDRV_DEVICE_TYPE_RAWMIDI: | |
230 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: | |
231 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: | |
3eafc959 | 232 | case SNDRV_DEVICE_TYPE_COMPRESS: |
7eaa943c TI |
233 | if (snd_BUG_ON(!card)) |
234 | return -EINVAL; | |
1da177e4 LT |
235 | minor = SNDRV_MINOR(card->number, type + dev); |
236 | break; | |
237 | default: | |
238 | return -EINVAL; | |
239 | } | |
7eaa943c TI |
240 | if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS)) |
241 | return -EINVAL; | |
1da177e4 LT |
242 | return minor; |
243 | } | |
332682b1 | 244 | #endif |
1da177e4 LT |
245 | |
246 | /** | |
12b131c4 | 247 | * snd_register_device_for_dev - Register the ALSA device file for the card |
1da177e4 LT |
248 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX |
249 | * @card: the card instance | |
250 | * @dev: the device index | |
2af677fc | 251 | * @f_ops: the file operations |
f87135f5 | 252 | * @private_data: user pointer for f_ops->open() |
1da177e4 | 253 | * @name: the device file name |
12b131c4 | 254 | * @device: the &struct device to link this new device to |
1da177e4 LT |
255 | * |
256 | * Registers an ALSA device file for the given card. | |
257 | * The operators have to be set in reg parameter. | |
258 | * | |
12b131c4 | 259 | * Returns zero if successful, or a negative error code on failure. |
1da177e4 | 260 | */ |
12b131c4 JB |
261 | int snd_register_device_for_dev(int type, struct snd_card *card, int dev, |
262 | const struct file_operations *f_ops, | |
263 | void *private_data, | |
264 | const char *name, struct device *device) | |
1da177e4 | 265 | { |
332682b1 | 266 | int minor; |
512bbd6a | 267 | struct snd_minor *preg; |
1da177e4 | 268 | |
7eaa943c TI |
269 | if (snd_BUG_ON(!name)) |
270 | return -EINVAL; | |
562b590d | 271 | preg = kmalloc(sizeof *preg, GFP_KERNEL); |
1da177e4 LT |
272 | if (preg == NULL) |
273 | return -ENOMEM; | |
2af677fc | 274 | preg->type = type; |
6983b724 | 275 | preg->card = card ? card->number : -1; |
1da177e4 | 276 | preg->device = dev; |
2af677fc | 277 | preg->f_ops = f_ops; |
f87135f5 | 278 | preg->private_data = private_data; |
1a60d4c5 | 279 | mutex_lock(&sound_mutex); |
332682b1 | 280 | #ifdef CONFIG_SND_DYNAMIC_MINORS |
03cfe6f5 | 281 | minor = snd_find_free_minor(type); |
332682b1 CL |
282 | #else |
283 | minor = snd_kernel_minor(type, card, dev); | |
284 | if (minor >= 0 && snd_minors[minor]) | |
285 | minor = -EBUSY; | |
286 | #endif | |
287 | if (minor < 0) { | |
1a60d4c5 | 288 | mutex_unlock(&sound_mutex); |
1da177e4 | 289 | kfree(preg); |
332682b1 | 290 | return minor; |
1da177e4 | 291 | } |
6983b724 | 292 | snd_minors[minor] = preg; |
abe9ab8f GKH |
293 | preg->dev = device_create(sound_class, device, MKDEV(major, minor), |
294 | private_data, "%s", name); | |
2469049e MK |
295 | if (IS_ERR(preg->dev)) { |
296 | snd_minors[minor] = NULL; | |
297 | mutex_unlock(&sound_mutex); | |
298 | minor = PTR_ERR(preg->dev); | |
299 | kfree(preg); | |
300 | return minor; | |
301 | } | |
302 | ||
1a60d4c5 | 303 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
304 | return 0; |
305 | } | |
306 | ||
12b131c4 | 307 | EXPORT_SYMBOL(snd_register_device_for_dev); |
c0d3fb39 | 308 | |
9d19f48c TI |
309 | /* find the matching minor record |
310 | * return the index of snd_minor, or -1 if not found | |
311 | */ | |
312 | static int find_snd_minor(int type, struct snd_card *card, int dev) | |
313 | { | |
314 | int cardnum, minor; | |
315 | struct snd_minor *mptr; | |
316 | ||
317 | cardnum = card ? card->number : -1; | |
318 | for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) | |
319 | if ((mptr = snd_minors[minor]) != NULL && | |
320 | mptr->type == type && | |
321 | mptr->card == cardnum && | |
322 | mptr->device == dev) | |
323 | return minor; | |
324 | return -1; | |
325 | } | |
326 | ||
1da177e4 LT |
327 | /** |
328 | * snd_unregister_device - unregister the device on the given card | |
329 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX | |
330 | * @card: the card instance | |
331 | * @dev: the device index | |
332 | * | |
333 | * Unregisters the device file already registered via | |
334 | * snd_register_device(). | |
335 | * | |
336 | * Returns zero if sucecessful, or a negative error code on failure | |
337 | */ | |
512bbd6a | 338 | int snd_unregister_device(int type, struct snd_card *card, int dev) |
1da177e4 | 339 | { |
9d19f48c | 340 | int minor; |
1da177e4 | 341 | |
1a60d4c5 | 342 | mutex_lock(&sound_mutex); |
9d19f48c TI |
343 | minor = find_snd_minor(type, card, dev); |
344 | if (minor < 0) { | |
1a60d4c5 | 345 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
346 | return -EINVAL; |
347 | } | |
348 | ||
d80f19fa | 349 | device_destroy(sound_class, MKDEV(major, minor)); |
1da177e4 | 350 | |
9d19f48c | 351 | kfree(snd_minors[minor]); |
6983b724 | 352 | snd_minors[minor] = NULL; |
1a60d4c5 | 353 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
354 | return 0; |
355 | } | |
356 | ||
c0d3fb39 TI |
357 | EXPORT_SYMBOL(snd_unregister_device); |
358 | ||
9d19f48c | 359 | int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev, |
d80f19fa | 360 | struct device_attribute *attr) |
9d19f48c TI |
361 | { |
362 | int minor, ret = -EINVAL; | |
d80f19fa | 363 | struct device *d; |
9d19f48c TI |
364 | |
365 | mutex_lock(&sound_mutex); | |
366 | minor = find_snd_minor(type, card, dev); | |
d80f19fa GKH |
367 | if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL) |
368 | ret = device_create_file(d, attr); | |
9d19f48c TI |
369 | mutex_unlock(&sound_mutex); |
370 | return ret; | |
371 | ||
372 | } | |
373 | ||
374 | EXPORT_SYMBOL(snd_add_device_sysfs_file); | |
375 | ||
e28563cc | 376 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
377 | /* |
378 | * INFO PART | |
379 | */ | |
380 | ||
6581f4e7 | 381 | static struct snd_info_entry *snd_minor_info_entry; |
1da177e4 | 382 | |
2af677fc CL |
383 | static const char *snd_device_type_name(int type) |
384 | { | |
385 | switch (type) { | |
386 | case SNDRV_DEVICE_TYPE_CONTROL: | |
387 | return "control"; | |
388 | case SNDRV_DEVICE_TYPE_HWDEP: | |
389 | return "hardware dependent"; | |
390 | case SNDRV_DEVICE_TYPE_RAWMIDI: | |
391 | return "raw midi"; | |
392 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: | |
393 | return "digital audio playback"; | |
394 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: | |
395 | return "digital audio capture"; | |
396 | case SNDRV_DEVICE_TYPE_SEQUENCER: | |
397 | return "sequencer"; | |
398 | case SNDRV_DEVICE_TYPE_TIMER: | |
399 | return "timer"; | |
400 | default: | |
401 | return "?"; | |
402 | } | |
403 | } | |
404 | ||
512bbd6a | 405 | static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 | 406 | { |
6983b724 | 407 | int minor; |
512bbd6a | 408 | struct snd_minor *mptr; |
1da177e4 | 409 | |
1a60d4c5 | 410 | mutex_lock(&sound_mutex); |
6983b724 CL |
411 | for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) { |
412 | if (!(mptr = snd_minors[minor])) | |
413 | continue; | |
414 | if (mptr->card >= 0) { | |
415 | if (mptr->device >= 0) | |
d001544d | 416 | snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n", |
6983b724 CL |
417 | minor, mptr->card, mptr->device, |
418 | snd_device_type_name(mptr->type)); | |
419 | else | |
d001544d | 420 | snd_iprintf(buffer, "%3i: [%2i] : %s\n", |
6983b724 CL |
421 | minor, mptr->card, |
422 | snd_device_type_name(mptr->type)); | |
423 | } else | |
d001544d | 424 | snd_iprintf(buffer, "%3i: : %s\n", minor, |
6983b724 | 425 | snd_device_type_name(mptr->type)); |
1da177e4 | 426 | } |
1a60d4c5 | 427 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
428 | } |
429 | ||
430 | int __init snd_minor_info_init(void) | |
431 | { | |
512bbd6a | 432 | struct snd_info_entry *entry; |
1da177e4 LT |
433 | |
434 | entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL); | |
435 | if (entry) { | |
1da177e4 LT |
436 | entry->c.text.read = snd_minor_info_read; |
437 | if (snd_info_register(entry) < 0) { | |
438 | snd_info_free_entry(entry); | |
439 | entry = NULL; | |
440 | } | |
441 | } | |
442 | snd_minor_info_entry = entry; | |
443 | return 0; | |
444 | } | |
445 | ||
446 | int __exit snd_minor_info_done(void) | |
447 | { | |
746d4a02 | 448 | snd_info_free_entry(snd_minor_info_entry); |
1da177e4 LT |
449 | return 0; |
450 | } | |
e28563cc | 451 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
452 | |
453 | /* | |
454 | * INIT PART | |
455 | */ | |
456 | ||
457 | static int __init alsa_sound_init(void) | |
458 | { | |
1da177e4 LT |
459 | snd_major = major; |
460 | snd_ecards_limit = cards_limit; | |
1da177e4 LT |
461 | if (register_chrdev(major, "alsa", &snd_fops)) { |
462 | snd_printk(KERN_ERR "unable to register native major device number %d\n", major); | |
1da177e4 LT |
463 | return -EIO; |
464 | } | |
1da177e4 | 465 | if (snd_info_init() < 0) { |
1da177e4 | 466 | unregister_chrdev(major, "alsa"); |
1da177e4 LT |
467 | return -ENOMEM; |
468 | } | |
469 | snd_info_minor_register(); | |
1da177e4 LT |
470 | #ifndef MODULE |
471 | printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"); | |
472 | #endif | |
473 | return 0; | |
474 | } | |
475 | ||
476 | static void __exit alsa_sound_exit(void) | |
477 | { | |
1da177e4 LT |
478 | snd_info_minor_unregister(); |
479 | snd_info_done(); | |
68fc4fab | 480 | unregister_chrdev(major, "alsa"); |
1da177e4 LT |
481 | } |
482 | ||
c181a13a TLSC |
483 | subsys_initcall(alsa_sound_init); |
484 | module_exit(alsa_sound_exit); |