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