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> |
1da177e4 LT |
26 | #include <linux/moduleparam.h> |
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 LT |
35 | |
36 | #define SNDRV_OS_MINORS 256 | |
37 | ||
38 | static int major = CONFIG_SND_MAJOR; | |
39 | int snd_major; | |
c0d3fb39 TI |
40 | EXPORT_SYMBOL(snd_major); |
41 | ||
1da177e4 | 42 | static int cards_limit = 1; |
1da177e4 | 43 | |
c1017a4c | 44 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); |
1da177e4 LT |
45 | MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards."); |
46 | MODULE_LICENSE("GPL"); | |
47 | module_param(major, int, 0444); | |
48 | MODULE_PARM_DESC(major, "Major # for sound driver."); | |
49 | module_param(cards_limit, int, 0444); | |
50 | MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards."); | |
1da177e4 LT |
51 | MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR); |
52 | ||
53 | /* this one holds the actual max. card number currently available. | |
54 | * as default, it's identical with cards_limit option. when more | |
55 | * modules are loaded manually, this limit number increases, too. | |
56 | */ | |
57 | int snd_ecards_limit; | |
c0d3fb39 | 58 | EXPORT_SYMBOL(snd_ecards_limit); |
1da177e4 | 59 | |
6983b724 | 60 | static struct snd_minor *snd_minors[SNDRV_OS_MINORS]; |
1a60d4c5 | 61 | static DEFINE_MUTEX(sound_mutex); |
1da177e4 | 62 | |
1da177e4 LT |
63 | #ifdef CONFIG_KMOD |
64 | ||
65 | /** | |
66 | * snd_request_card - try to load the card module | |
67 | * @card: the card number | |
68 | * | |
69 | * Tries to load the module "snd-card-X" for the given card number | |
70 | * via KMOD. Returns immediately if already loaded. | |
71 | */ | |
72 | void snd_request_card(int card) | |
73 | { | |
746df948 | 74 | if (snd_card_locked(card)) |
1da177e4 LT |
75 | return; |
76 | if (card < 0 || card >= cards_limit) | |
77 | return; | |
78 | request_module("snd-card-%i", card); | |
79 | } | |
80 | ||
c0d3fb39 TI |
81 | EXPORT_SYMBOL(snd_request_card); |
82 | ||
1da177e4 LT |
83 | static void snd_request_other(int minor) |
84 | { | |
85 | char *str; | |
86 | ||
1da177e4 LT |
87 | switch (minor) { |
88 | case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break; | |
89 | case SNDRV_MINOR_TIMER: str = "snd-timer"; break; | |
90 | default: return; | |
91 | } | |
92 | request_module(str); | |
93 | } | |
94 | ||
95 | #endif /* request_module support */ | |
96 | ||
f87135f5 CL |
97 | /** |
98 | * snd_lookup_minor_data - get user data of a registered device | |
99 | * @minor: the minor number | |
100 | * @type: device type (SNDRV_DEVICE_TYPE_XXX) | |
101 | * | |
102 | * Checks that a minor device with the specified type is registered, and returns | |
103 | * its user data pointer. | |
104 | */ | |
105 | void *snd_lookup_minor_data(unsigned int minor, int type) | |
106 | { | |
107 | struct snd_minor *mreg; | |
108 | void *private_data; | |
109 | ||
3a63e444 | 110 | if (minor >= ARRAY_SIZE(snd_minors)) |
f87135f5 | 111 | return NULL; |
1a60d4c5 | 112 | mutex_lock(&sound_mutex); |
f87135f5 CL |
113 | mreg = snd_minors[minor]; |
114 | if (mreg && mreg->type == type) | |
115 | private_data = mreg->private_data; | |
116 | else | |
117 | private_data = NULL; | |
1a60d4c5 | 118 | mutex_unlock(&sound_mutex); |
f87135f5 CL |
119 | return private_data; |
120 | } | |
121 | ||
c0d3fb39 TI |
122 | EXPORT_SYMBOL(snd_lookup_minor_data); |
123 | ||
1da177e4 LT |
124 | static int snd_open(struct inode *inode, struct file *file) |
125 | { | |
332682b1 | 126 | unsigned int minor = iminor(inode); |
512bbd6a | 127 | struct snd_minor *mptr = NULL; |
99ac48f5 | 128 | const struct file_operations *old_fops; |
1da177e4 LT |
129 | int err = 0; |
130 | ||
3a63e444 | 131 | if (minor >= ARRAY_SIZE(snd_minors)) |
332682b1 CL |
132 | return -ENODEV; |
133 | mptr = snd_minors[minor]; | |
134 | if (mptr == NULL) { | |
1da177e4 | 135 | #ifdef CONFIG_KMOD |
332682b1 CL |
136 | int dev = SNDRV_MINOR_DEVICE(minor); |
137 | if (dev == SNDRV_MINOR_CONTROL) { | |
138 | /* /dev/aloadC? */ | |
139 | int card = SNDRV_MINOR_CARD(minor); | |
1da177e4 | 140 | if (snd_cards[card] == NULL) |
332682b1 CL |
141 | snd_request_card(card); |
142 | } else if (dev == SNDRV_MINOR_GLOBAL) { | |
143 | /* /dev/aloadSEQ */ | |
1da177e4 | 144 | snd_request_other(minor); |
332682b1 CL |
145 | } |
146 | #ifndef CONFIG_SND_DYNAMIC_MINORS | |
147 | /* /dev/snd/{controlC?,seq} */ | |
148 | mptr = snd_minors[minor]; | |
149 | if (mptr == NULL) | |
150 | #endif | |
1da177e4 | 151 | #endif |
332682b1 | 152 | return -ENODEV; |
1da177e4 | 153 | } |
1da177e4 LT |
154 | old_fops = file->f_op; |
155 | file->f_op = fops_get(mptr->f_ops); | |
156 | if (file->f_op->open) | |
157 | err = file->f_op->open(inode, file); | |
158 | if (err) { | |
159 | fops_put(file->f_op); | |
160 | file->f_op = fops_get(old_fops); | |
161 | } | |
162 | fops_put(old_fops); | |
163 | return err; | |
164 | } | |
165 | ||
9c2e08c5 | 166 | static const struct file_operations snd_fops = |
1da177e4 LT |
167 | { |
168 | .owner = THIS_MODULE, | |
169 | .open = snd_open | |
170 | }; | |
171 | ||
332682b1 CL |
172 | #ifdef CONFIG_SND_DYNAMIC_MINORS |
173 | static int snd_find_free_minor(void) | |
174 | { | |
175 | int minor; | |
176 | ||
177 | for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) { | |
178 | /* skip minors still used statically for autoloading devices */ | |
179 | if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL || | |
180 | minor == SNDRV_MINOR_SEQUENCER) | |
181 | continue; | |
182 | if (!snd_minors[minor]) | |
183 | return minor; | |
184 | } | |
185 | return -EBUSY; | |
186 | } | |
187 | #else | |
512bbd6a | 188 | static int snd_kernel_minor(int type, struct snd_card *card, int dev) |
1da177e4 LT |
189 | { |
190 | int minor; | |
191 | ||
192 | switch (type) { | |
193 | case SNDRV_DEVICE_TYPE_SEQUENCER: | |
194 | case SNDRV_DEVICE_TYPE_TIMER: | |
195 | minor = type; | |
196 | break; | |
197 | case SNDRV_DEVICE_TYPE_CONTROL: | |
198 | snd_assert(card != NULL, return -EINVAL); | |
199 | minor = SNDRV_MINOR(card->number, type); | |
200 | break; | |
201 | case SNDRV_DEVICE_TYPE_HWDEP: | |
202 | case SNDRV_DEVICE_TYPE_RAWMIDI: | |
203 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: | |
204 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: | |
205 | snd_assert(card != NULL, return -EINVAL); | |
206 | minor = SNDRV_MINOR(card->number, type + dev); | |
207 | break; | |
208 | default: | |
209 | return -EINVAL; | |
210 | } | |
211 | snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL); | |
212 | return minor; | |
213 | } | |
332682b1 | 214 | #endif |
1da177e4 LT |
215 | |
216 | /** | |
12b131c4 | 217 | * snd_register_device_for_dev - Register the ALSA device file for the card |
1da177e4 LT |
218 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX |
219 | * @card: the card instance | |
220 | * @dev: the device index | |
2af677fc | 221 | * @f_ops: the file operations |
f87135f5 | 222 | * @private_data: user pointer for f_ops->open() |
1da177e4 | 223 | * @name: the device file name |
12b131c4 | 224 | * @device: the &struct device to link this new device to |
1da177e4 LT |
225 | * |
226 | * Registers an ALSA device file for the given card. | |
227 | * The operators have to be set in reg parameter. | |
228 | * | |
12b131c4 | 229 | * Returns zero if successful, or a negative error code on failure. |
1da177e4 | 230 | */ |
12b131c4 JB |
231 | int snd_register_device_for_dev(int type, struct snd_card *card, int dev, |
232 | const struct file_operations *f_ops, | |
233 | void *private_data, | |
234 | const char *name, struct device *device) | |
1da177e4 | 235 | { |
332682b1 | 236 | int minor; |
512bbd6a | 237 | struct snd_minor *preg; |
1da177e4 | 238 | |
1da177e4 | 239 | snd_assert(name, return -EINVAL); |
562b590d | 240 | preg = kmalloc(sizeof *preg, GFP_KERNEL); |
1da177e4 LT |
241 | if (preg == NULL) |
242 | return -ENOMEM; | |
2af677fc | 243 | preg->type = type; |
6983b724 | 244 | preg->card = card ? card->number : -1; |
1da177e4 | 245 | preg->device = dev; |
2af677fc | 246 | preg->f_ops = f_ops; |
f87135f5 | 247 | preg->private_data = private_data; |
1a60d4c5 | 248 | mutex_lock(&sound_mutex); |
332682b1 CL |
249 | #ifdef CONFIG_SND_DYNAMIC_MINORS |
250 | minor = snd_find_free_minor(); | |
251 | #else | |
252 | minor = snd_kernel_minor(type, card, dev); | |
253 | if (minor >= 0 && snd_minors[minor]) | |
254 | minor = -EBUSY; | |
255 | #endif | |
256 | if (minor < 0) { | |
1a60d4c5 | 257 | mutex_unlock(&sound_mutex); |
1da177e4 | 258 | kfree(preg); |
332682b1 | 259 | return minor; |
1da177e4 | 260 | } |
6983b724 | 261 | snd_minors[minor] = preg; |
5d99a8b8 GKH |
262 | preg->dev = device_create_drvdata(sound_class, device, |
263 | MKDEV(major, minor), | |
264 | private_data, "%s", name); | |
2469049e MK |
265 | if (IS_ERR(preg->dev)) { |
266 | snd_minors[minor] = NULL; | |
267 | mutex_unlock(&sound_mutex); | |
268 | minor = PTR_ERR(preg->dev); | |
269 | kfree(preg); | |
270 | return minor; | |
271 | } | |
272 | ||
1a60d4c5 | 273 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
274 | return 0; |
275 | } | |
276 | ||
12b131c4 | 277 | EXPORT_SYMBOL(snd_register_device_for_dev); |
c0d3fb39 | 278 | |
9d19f48c TI |
279 | /* find the matching minor record |
280 | * return the index of snd_minor, or -1 if not found | |
281 | */ | |
282 | static int find_snd_minor(int type, struct snd_card *card, int dev) | |
283 | { | |
284 | int cardnum, minor; | |
285 | struct snd_minor *mptr; | |
286 | ||
287 | cardnum = card ? card->number : -1; | |
288 | for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) | |
289 | if ((mptr = snd_minors[minor]) != NULL && | |
290 | mptr->type == type && | |
291 | mptr->card == cardnum && | |
292 | mptr->device == dev) | |
293 | return minor; | |
294 | return -1; | |
295 | } | |
296 | ||
1da177e4 LT |
297 | /** |
298 | * snd_unregister_device - unregister the device on the given card | |
299 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX | |
300 | * @card: the card instance | |
301 | * @dev: the device index | |
302 | * | |
303 | * Unregisters the device file already registered via | |
304 | * snd_register_device(). | |
305 | * | |
306 | * Returns zero if sucecessful, or a negative error code on failure | |
307 | */ | |
512bbd6a | 308 | int snd_unregister_device(int type, struct snd_card *card, int dev) |
1da177e4 | 309 | { |
9d19f48c | 310 | int minor; |
1da177e4 | 311 | |
1a60d4c5 | 312 | mutex_lock(&sound_mutex); |
9d19f48c TI |
313 | minor = find_snd_minor(type, card, dev); |
314 | if (minor < 0) { | |
1a60d4c5 | 315 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
316 | return -EINVAL; |
317 | } | |
318 | ||
d80f19fa | 319 | device_destroy(sound_class, MKDEV(major, minor)); |
1da177e4 | 320 | |
9d19f48c | 321 | kfree(snd_minors[minor]); |
6983b724 | 322 | snd_minors[minor] = NULL; |
1a60d4c5 | 323 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
324 | return 0; |
325 | } | |
326 | ||
c0d3fb39 TI |
327 | EXPORT_SYMBOL(snd_unregister_device); |
328 | ||
9d19f48c | 329 | int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev, |
d80f19fa | 330 | struct device_attribute *attr) |
9d19f48c TI |
331 | { |
332 | int minor, ret = -EINVAL; | |
d80f19fa | 333 | struct device *d; |
9d19f48c TI |
334 | |
335 | mutex_lock(&sound_mutex); | |
336 | minor = find_snd_minor(type, card, dev); | |
d80f19fa GKH |
337 | if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL) |
338 | ret = device_create_file(d, attr); | |
9d19f48c TI |
339 | mutex_unlock(&sound_mutex); |
340 | return ret; | |
341 | ||
342 | } | |
343 | ||
344 | EXPORT_SYMBOL(snd_add_device_sysfs_file); | |
345 | ||
e28563cc | 346 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
347 | /* |
348 | * INFO PART | |
349 | */ | |
350 | ||
6581f4e7 | 351 | static struct snd_info_entry *snd_minor_info_entry; |
1da177e4 | 352 | |
2af677fc CL |
353 | static const char *snd_device_type_name(int type) |
354 | { | |
355 | switch (type) { | |
356 | case SNDRV_DEVICE_TYPE_CONTROL: | |
357 | return "control"; | |
358 | case SNDRV_DEVICE_TYPE_HWDEP: | |
359 | return "hardware dependent"; | |
360 | case SNDRV_DEVICE_TYPE_RAWMIDI: | |
361 | return "raw midi"; | |
362 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: | |
363 | return "digital audio playback"; | |
364 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: | |
365 | return "digital audio capture"; | |
366 | case SNDRV_DEVICE_TYPE_SEQUENCER: | |
367 | return "sequencer"; | |
368 | case SNDRV_DEVICE_TYPE_TIMER: | |
369 | return "timer"; | |
370 | default: | |
371 | return "?"; | |
372 | } | |
373 | } | |
374 | ||
512bbd6a | 375 | static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 | 376 | { |
6983b724 | 377 | int minor; |
512bbd6a | 378 | struct snd_minor *mptr; |
1da177e4 | 379 | |
1a60d4c5 | 380 | mutex_lock(&sound_mutex); |
6983b724 CL |
381 | for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) { |
382 | if (!(mptr = snd_minors[minor])) | |
383 | continue; | |
384 | if (mptr->card >= 0) { | |
385 | if (mptr->device >= 0) | |
d001544d | 386 | snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n", |
6983b724 CL |
387 | minor, mptr->card, mptr->device, |
388 | snd_device_type_name(mptr->type)); | |
389 | else | |
d001544d | 390 | snd_iprintf(buffer, "%3i: [%2i] : %s\n", |
6983b724 CL |
391 | minor, mptr->card, |
392 | snd_device_type_name(mptr->type)); | |
393 | } else | |
d001544d | 394 | snd_iprintf(buffer, "%3i: : %s\n", minor, |
6983b724 | 395 | snd_device_type_name(mptr->type)); |
1da177e4 | 396 | } |
1a60d4c5 | 397 | mutex_unlock(&sound_mutex); |
1da177e4 LT |
398 | } |
399 | ||
400 | int __init snd_minor_info_init(void) | |
401 | { | |
512bbd6a | 402 | struct snd_info_entry *entry; |
1da177e4 LT |
403 | |
404 | entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL); | |
405 | if (entry) { | |
1da177e4 LT |
406 | entry->c.text.read = snd_minor_info_read; |
407 | if (snd_info_register(entry) < 0) { | |
408 | snd_info_free_entry(entry); | |
409 | entry = NULL; | |
410 | } | |
411 | } | |
412 | snd_minor_info_entry = entry; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | int __exit snd_minor_info_done(void) | |
417 | { | |
746d4a02 | 418 | snd_info_free_entry(snd_minor_info_entry); |
1da177e4 LT |
419 | return 0; |
420 | } | |
e28563cc | 421 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
422 | |
423 | /* | |
424 | * INIT PART | |
425 | */ | |
426 | ||
427 | static int __init alsa_sound_init(void) | |
428 | { | |
1da177e4 LT |
429 | snd_major = major; |
430 | snd_ecards_limit = cards_limit; | |
1da177e4 LT |
431 | if (register_chrdev(major, "alsa", &snd_fops)) { |
432 | snd_printk(KERN_ERR "unable to register native major device number %d\n", major); | |
1da177e4 LT |
433 | return -EIO; |
434 | } | |
1da177e4 | 435 | if (snd_info_init() < 0) { |
1da177e4 | 436 | unregister_chrdev(major, "alsa"); |
1da177e4 LT |
437 | return -ENOMEM; |
438 | } | |
439 | snd_info_minor_register(); | |
1da177e4 LT |
440 | #ifndef MODULE |
441 | printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"); | |
442 | #endif | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static void __exit alsa_sound_exit(void) | |
447 | { | |
1da177e4 LT |
448 | snd_info_minor_unregister(); |
449 | snd_info_done(); | |
68fc4fab | 450 | unregister_chrdev(major, "alsa"); |
1da177e4 LT |
451 | } |
452 | ||
453 | module_init(alsa_sound_init) | |
454 | module_exit(alsa_sound_exit) |