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[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz
[net-next-2.6.git] / sound / core / sound.c
CommitLineData
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
39static int major = CONFIG_SND_MAJOR;
40int snd_major;
c0d3fb39
TI
41EXPORT_SYMBOL(snd_major);
42
1da177e4 43static int cards_limit = 1;
1da177e4 44
c1017a4c 45MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4
LT
46MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
47MODULE_LICENSE("GPL");
48module_param(major, int, 0444);
49MODULE_PARM_DESC(major, "Major # for sound driver.");
50module_param(cards_limit, int, 0444);
51MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
1da177e4
LT
52MODULE_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 */
58int snd_ecards_limit;
c0d3fb39 59EXPORT_SYMBOL(snd_ecards_limit);
1da177e4 60
6983b724 61static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5 62static 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 */
73void 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
84EXPORT_SYMBOL(snd_request_card);
85
1da177e4
LT
86static 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 */
110void *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
127EXPORT_SYMBOL(snd_lookup_minor_data);
128
1da177e4
LT
129static 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 171static 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
178static 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 193static 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
236int 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 284EXPORT_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 */
289static 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 315int 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
334EXPORT_SYMBOL(snd_unregister_device);
335
9d19f48c 336int 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
351EXPORT_SYMBOL(snd_add_device_sysfs_file);
352
e28563cc 353#ifdef CONFIG_PROC_FS
1da177e4
LT
354/*
355 * INFO PART
356 */
357
6581f4e7 358static struct snd_info_entry *snd_minor_info_entry;
1da177e4 359
2af677fc
CL
360static 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 382static 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
407int __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
423int __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
434static 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
453static 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
460module_init(alsa_sound_init)
461module_exit(alsa_sound_exit)