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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Advanced Linux Sound Architecture
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/time.h>
Takashi Iwai9a1a2a12005-11-22 15:46:41 +010025#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#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>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010034#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Linus Torvalds1da177e2005-04-16 15:20:36 -070036static int major = CONFIG_SND_MAJOR;
37int snd_major;
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020038EXPORT_SYMBOL(snd_major);
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040static int cards_limit = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020042MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070043MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
44MODULE_LICENSE("GPL");
45module_param(major, int, 0444);
46MODULE_PARM_DESC(major, "Major # for sound driver.");
47module_param(cards_limit, int, 0444);
48MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049MODULE_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 */
55int snd_ecards_limit;
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020056EXPORT_SYMBOL(snd_ecards_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Clemens Ladisch6983b722005-11-20 14:05:49 +010058static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010059static DEFINE_MUTEX(sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Johannes Bergee2da992008-07-09 10:28:41 +020061#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
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
Johannes Bergee2da992008-07-09 10:28:41 +020068 * via request_module. Returns immediately if already loaded.
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 */
70void snd_request_card(int card)
71{
Takashi Iwai746df942006-05-15 19:49:05 +020072 if (snd_card_locked(card))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return;
74 if (card < 0 || card >= cards_limit)
75 return;
76 request_module("snd-card-%i", card);
77}
78
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020079EXPORT_SYMBOL(snd_request_card);
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081static void snd_request_other(int minor)
82{
83 char *str;
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 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
Johannes Bergee2da992008-07-09 10:28:41 +020093#endif /* modular kernel */
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Clemens Ladischf87135f2005-11-20 14:06:59 +010095/**
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 */
103void *snd_lookup_minor_data(unsigned int minor, int type)
104{
105 struct snd_minor *mreg;
106 void *private_data;
107
Adrian Bunk3a63e4442006-03-13 14:14:10 +0100108 if (minor >= ARRAY_SIZE(snd_minors))
Clemens Ladischf87135f2005-11-20 14:06:59 +0100109 return NULL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100110 mutex_lock(&sound_mutex);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100111 mreg = snd_minors[minor];
112 if (mreg && mreg->type == type)
113 private_data = mreg->private_data;
114 else
115 private_data = NULL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100116 mutex_unlock(&sound_mutex);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100117 return private_data;
118}
119
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200120EXPORT_SYMBOL(snd_lookup_minor_data);
121
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200122#ifdef CONFIG_MODULES
123static 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
144static int snd_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
Clemens Ladisch332682b2005-11-20 14:07:47 +0100146 unsigned int minor = iminor(inode);
Takashi Iwai512bbd62005-11-17 13:51:18 +0100147 struct snd_minor *mptr = NULL;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800148 const struct file_operations *old_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 int err = 0;
150
Adrian Bunk3a63e4442006-03-13 14:14:10 +0100151 if (minor >= ARRAY_SIZE(snd_minors))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 return -ENODEV;
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200153 mutex_lock(&sound_mutex);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100154 mptr = snd_minors[minor];
155 if (mptr == NULL) {
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200156 mptr = autoload_device(minor);
157 if (!mptr) {
158 mutex_unlock(&sound_mutex);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100159 return -ENODEV;
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200160 }
Clemens Ladisch332682b2005-11-20 14:07:47 +0100161 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 old_fops = file->f_op;
163 file->f_op = fops_get(mptr->f_ops);
Laurent Pinchartf41ced82009-01-06 14:40:40 -0800164 if (file->f_op == NULL) {
165 file->f_op = old_fops;
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200166 err = -ENODEV;
Laurent Pinchartf41ced82009-01-06 14:40:40 -0800167 }
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200168 mutex_unlock(&sound_mutex);
169 if (err < 0)
170 return err;
171
172 if (file->f_op->open) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 err = file->f_op->open(inode, file);
Takashi Iwai4cf19b82010-04-07 18:52:08 +0200174 if (err) {
175 fops_put(file->f_op);
176 file->f_op = fops_get(old_fops);
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179 fops_put(old_fops);
180 return err;
181}
182
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800183static const struct file_operations snd_fops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
185 .owner = THIS_MODULE,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200186 .open = snd_open,
187 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188};
189
Clemens Ladisch332682b2005-11-20 14:07:47 +0100190#ifdef CONFIG_SND_DYNAMIC_MINORS
Kay Sievers03cfe6f2010-11-23 17:43:19 +0100191static int snd_find_free_minor(int type)
Clemens Ladisch332682b2005-11-20 14:07:47 +0100192{
193 int minor;
194
Kay Sievers03cfe6f2010-11-23 17:43:19 +0100195 /* 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
Clemens Ladisch332682b2005-11-20 14:07:47 +0100201 for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
Kay Sievers03cfe6f2010-11-23 17:43:19 +0100202 /* 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)
Clemens Ladisch332682b2005-11-20 14:07:47 +0100207 continue;
208 if (!snd_minors[minor])
209 return minor;
210 }
211 return -EBUSY;
212}
213#else
Takashi Iwai512bbd62005-11-17 13:51:18 +0100214static int snd_kernel_minor(int type, struct snd_card *card, int dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
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:
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200224 if (snd_BUG_ON(!card))
225 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 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:
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200232 if (snd_BUG_ON(!card))
233 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 minor = SNDRV_MINOR(card->number, type + dev);
235 break;
236 default:
237 return -EINVAL;
238 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200239 if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS))
240 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 return minor;
242}
Clemens Ladisch332682b2005-11-20 14:07:47 +0100243#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245/**
Johannes Berg12b131c2006-10-05 15:05:34 +0200246 * snd_register_device_for_dev - Register the ALSA device file for the card
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
248 * @card: the card instance
249 * @dev: the device index
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100250 * @f_ops: the file operations
Clemens Ladischf87135f2005-11-20 14:06:59 +0100251 * @private_data: user pointer for f_ops->open()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 * @name: the device file name
Johannes Berg12b131c2006-10-05 15:05:34 +0200253 * @device: the &struct device to link this new device to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 *
255 * Registers an ALSA device file for the given card.
256 * The operators have to be set in reg parameter.
257 *
Johannes Berg12b131c2006-10-05 15:05:34 +0200258 * Returns zero if successful, or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 */
Johannes Berg12b131c2006-10-05 15:05:34 +0200260int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
261 const struct file_operations *f_ops,
262 void *private_data,
263 const char *name, struct device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
Clemens Ladisch332682b2005-11-20 14:07:47 +0100265 int minor;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100266 struct snd_minor *preg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200268 if (snd_BUG_ON(!name))
269 return -EINVAL;
Clemens Ladisch562b5902006-07-05 11:24:22 +0200270 preg = kmalloc(sizeof *preg, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 if (preg == NULL)
272 return -ENOMEM;
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100273 preg->type = type;
Clemens Ladisch6983b722005-11-20 14:05:49 +0100274 preg->card = card ? card->number : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 preg->device = dev;
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100276 preg->f_ops = f_ops;
Clemens Ladischf87135f2005-11-20 14:06:59 +0100277 preg->private_data = private_data;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100278 mutex_lock(&sound_mutex);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100279#ifdef CONFIG_SND_DYNAMIC_MINORS
Kay Sievers03cfe6f2010-11-23 17:43:19 +0100280 minor = snd_find_free_minor(type);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100281#else
282 minor = snd_kernel_minor(type, card, dev);
283 if (minor >= 0 && snd_minors[minor])
284 minor = -EBUSY;
285#endif
286 if (minor < 0) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100287 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 kfree(preg);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100289 return minor;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
Clemens Ladisch6983b722005-11-20 14:05:49 +0100291 snd_minors[minor] = preg;
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700292 preg->dev = device_create(sound_class, device, MKDEV(major, minor),
293 private_data, "%s", name);
Mariusz Kozlowski24690492007-10-09 10:34:06 +0200294 if (IS_ERR(preg->dev)) {
295 snd_minors[minor] = NULL;
296 mutex_unlock(&sound_mutex);
297 minor = PTR_ERR(preg->dev);
298 kfree(preg);
299 return minor;
300 }
301
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100302 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return 0;
304}
305
Johannes Berg12b131c2006-10-05 15:05:34 +0200306EXPORT_SYMBOL(snd_register_device_for_dev);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200307
Takashi Iwai9d19f482006-09-06 14:27:46 +0200308/* find the matching minor record
309 * return the index of snd_minor, or -1 if not found
310 */
311static int find_snd_minor(int type, struct snd_card *card, int dev)
312{
313 int cardnum, minor;
314 struct snd_minor *mptr;
315
316 cardnum = card ? card->number : -1;
317 for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
318 if ((mptr = snd_minors[minor]) != NULL &&
319 mptr->type == type &&
320 mptr->card == cardnum &&
321 mptr->device == dev)
322 return minor;
323 return -1;
324}
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326/**
327 * snd_unregister_device - unregister the device on the given card
328 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
329 * @card: the card instance
330 * @dev: the device index
331 *
332 * Unregisters the device file already registered via
333 * snd_register_device().
334 *
335 * Returns zero if sucecessful, or a negative error code on failure
336 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100337int snd_unregister_device(int type, struct snd_card *card, int dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Takashi Iwai9d19f482006-09-06 14:27:46 +0200339 int minor;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100341 mutex_lock(&sound_mutex);
Takashi Iwai9d19f482006-09-06 14:27:46 +0200342 minor = find_snd_minor(type, card, dev);
343 if (minor < 0) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100344 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return -EINVAL;
346 }
347
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700348 device_destroy(sound_class, MKDEV(major, minor));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Takashi Iwai9d19f482006-09-06 14:27:46 +0200350 kfree(snd_minors[minor]);
Clemens Ladisch6983b722005-11-20 14:05:49 +0100351 snd_minors[minor] = NULL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100352 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return 0;
354}
355
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200356EXPORT_SYMBOL(snd_unregister_device);
357
Takashi Iwai9d19f482006-09-06 14:27:46 +0200358int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700359 struct device_attribute *attr)
Takashi Iwai9d19f482006-09-06 14:27:46 +0200360{
361 int minor, ret = -EINVAL;
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700362 struct device *d;
Takashi Iwai9d19f482006-09-06 14:27:46 +0200363
364 mutex_lock(&sound_mutex);
365 minor = find_snd_minor(type, card, dev);
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700366 if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
367 ret = device_create_file(d, attr);
Takashi Iwai9d19f482006-09-06 14:27:46 +0200368 mutex_unlock(&sound_mutex);
369 return ret;
370
371}
372
373EXPORT_SYMBOL(snd_add_device_sysfs_file);
374
Takashi Iwaie28563c2005-12-01 10:42:42 +0100375#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376/*
377 * INFO PART
378 */
379
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200380static struct snd_info_entry *snd_minor_info_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100382static const char *snd_device_type_name(int type)
383{
384 switch (type) {
385 case SNDRV_DEVICE_TYPE_CONTROL:
386 return "control";
387 case SNDRV_DEVICE_TYPE_HWDEP:
388 return "hardware dependent";
389 case SNDRV_DEVICE_TYPE_RAWMIDI:
390 return "raw midi";
391 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
392 return "digital audio playback";
393 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
394 return "digital audio capture";
395 case SNDRV_DEVICE_TYPE_SEQUENCER:
396 return "sequencer";
397 case SNDRV_DEVICE_TYPE_TIMER:
398 return "timer";
399 default:
400 return "?";
401 }
402}
403
Takashi Iwai512bbd62005-11-17 13:51:18 +0100404static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Clemens Ladisch6983b722005-11-20 14:05:49 +0100406 int minor;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100407 struct snd_minor *mptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100409 mutex_lock(&sound_mutex);
Clemens Ladisch6983b722005-11-20 14:05:49 +0100410 for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
411 if (!(mptr = snd_minors[minor]))
412 continue;
413 if (mptr->card >= 0) {
414 if (mptr->device >= 0)
Clemens Ladischd0015442005-11-20 14:09:05 +0100415 snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
Clemens Ladisch6983b722005-11-20 14:05:49 +0100416 minor, mptr->card, mptr->device,
417 snd_device_type_name(mptr->type));
418 else
Clemens Ladischd0015442005-11-20 14:09:05 +0100419 snd_iprintf(buffer, "%3i: [%2i] : %s\n",
Clemens Ladisch6983b722005-11-20 14:05:49 +0100420 minor, mptr->card,
421 snd_device_type_name(mptr->type));
422 } else
Clemens Ladischd0015442005-11-20 14:09:05 +0100423 snd_iprintf(buffer, "%3i: : %s\n", minor,
Clemens Ladisch6983b722005-11-20 14:05:49 +0100424 snd_device_type_name(mptr->type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100426 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427}
428
429int __init snd_minor_info_init(void)
430{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100431 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433 entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
434 if (entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 entry->c.text.read = snd_minor_info_read;
436 if (snd_info_register(entry) < 0) {
437 snd_info_free_entry(entry);
438 entry = NULL;
439 }
440 }
441 snd_minor_info_entry = entry;
442 return 0;
443}
444
445int __exit snd_minor_info_done(void)
446{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200447 snd_info_free_entry(snd_minor_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 return 0;
449}
Takashi Iwaie28563c2005-12-01 10:42:42 +0100450#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452/*
453 * INIT PART
454 */
455
456static int __init alsa_sound_init(void)
457{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 snd_major = major;
459 snd_ecards_limit = cards_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 if (register_chrdev(major, "alsa", &snd_fops)) {
461 snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 return -EIO;
463 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 if (snd_info_init() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 unregister_chrdev(major, "alsa");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return -ENOMEM;
467 }
468 snd_info_minor_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469#ifndef MODULE
470 printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
471#endif
472 return 0;
473}
474
475static void __exit alsa_sound_exit(void)
476{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 snd_info_minor_unregister();
478 snd_info_done();
Akinobu Mita68fc4fa2007-07-19 01:47:50 -0700479 unregister_chrdev(major, "alsa");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
Thadeu Lima de Souza Cascardoc181a132010-01-12 20:20:39 -0200482subsys_initcall(alsa_sound_init);
483module_exit(alsa_sound_exit);