2 * Advanced Linux Sound Architecture
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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.
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.
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
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/device.h>
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>
35 #include <linux/devfs_fs_kernel.h>
36 #include <linux/mutex.h>
38 #define SNDRV_OS_MINORS 256
40 static int major
= CONFIG_SND_MAJOR
;
42 EXPORT_SYMBOL(snd_major
);
44 static int cards_limit
= 1;
45 static int device_mode
= S_IFCHR
| S_IRUGO
| S_IWUGO
;
47 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
48 MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
49 MODULE_LICENSE("GPL");
50 module_param(major
, int, 0444);
51 MODULE_PARM_DESC(major
, "Major # for sound driver.");
52 module_param(cards_limit
, int, 0444);
53 MODULE_PARM_DESC(cards_limit
, "Count of auto-loadable soundcards.");
54 #ifdef CONFIG_DEVFS_FS
55 module_param(device_mode
, int, 0444);
56 MODULE_PARM_DESC(device_mode
, "Device file permission mask for devfs.");
58 MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR
);
60 /* this one holds the actual max. card number currently available.
61 * as default, it's identical with cards_limit option. when more
62 * modules are loaded manually, this limit number increases, too.
65 EXPORT_SYMBOL(snd_ecards_limit
);
67 static struct snd_minor
*snd_minors
[SNDRV_OS_MINORS
];
68 static DEFINE_MUTEX(sound_mutex
);
70 extern struct class *sound_class
;
76 * snd_request_card - try to load the card module
77 * @card: the card number
79 * Tries to load the module "snd-card-X" for the given card number
80 * via KMOD. Returns immediately if already loaded.
82 void snd_request_card(int card
)
84 if (! current
->fs
->root
)
86 if (snd_card_locked(card
))
88 if (card
< 0 || card
>= cards_limit
)
90 request_module("snd-card-%i", card
);
93 EXPORT_SYMBOL(snd_request_card
);
95 static void snd_request_other(int minor
)
99 if (! current
->fs
->root
)
102 case SNDRV_MINOR_SEQUENCER
: str
= "snd-seq"; break;
103 case SNDRV_MINOR_TIMER
: str
= "snd-timer"; break;
109 #endif /* request_module support */
112 * snd_lookup_minor_data - get user data of a registered device
113 * @minor: the minor number
114 * @type: device type (SNDRV_DEVICE_TYPE_XXX)
116 * Checks that a minor device with the specified type is registered, and returns
117 * its user data pointer.
119 void *snd_lookup_minor_data(unsigned int minor
, int type
)
121 struct snd_minor
*mreg
;
124 if (minor
>= ARRAY_SIZE(snd_minors
))
126 mutex_lock(&sound_mutex
);
127 mreg
= snd_minors
[minor
];
128 if (mreg
&& mreg
->type
== type
)
129 private_data
= mreg
->private_data
;
132 mutex_unlock(&sound_mutex
);
136 EXPORT_SYMBOL(snd_lookup_minor_data
);
138 static int snd_open(struct inode
*inode
, struct file
*file
)
140 unsigned int minor
= iminor(inode
);
141 struct snd_minor
*mptr
= NULL
;
142 const struct file_operations
*old_fops
;
145 if (minor
>= ARRAY_SIZE(snd_minors
))
147 mptr
= snd_minors
[minor
];
150 int dev
= SNDRV_MINOR_DEVICE(minor
);
151 if (dev
== SNDRV_MINOR_CONTROL
) {
153 int card
= SNDRV_MINOR_CARD(minor
);
154 if (snd_cards
[card
] == NULL
)
155 snd_request_card(card
);
156 } else if (dev
== SNDRV_MINOR_GLOBAL
) {
158 snd_request_other(minor
);
160 #ifndef CONFIG_SND_DYNAMIC_MINORS
161 /* /dev/snd/{controlC?,seq} */
162 mptr
= snd_minors
[minor
];
168 old_fops
= file
->f_op
;
169 file
->f_op
= fops_get(mptr
->f_ops
);
170 if (file
->f_op
->open
)
171 err
= file
->f_op
->open(inode
, file
);
173 fops_put(file
->f_op
);
174 file
->f_op
= fops_get(old_fops
);
180 static struct file_operations snd_fops
=
182 .owner
= THIS_MODULE
,
186 #ifdef CONFIG_SND_DYNAMIC_MINORS
187 static int snd_find_free_minor(void)
191 for (minor
= 0; minor
< ARRAY_SIZE(snd_minors
); ++minor
) {
192 /* skip minors still used statically for autoloading devices */
193 if (SNDRV_MINOR_DEVICE(minor
) == SNDRV_MINOR_CONTROL
||
194 minor
== SNDRV_MINOR_SEQUENCER
)
196 if (!snd_minors
[minor
])
202 static int snd_kernel_minor(int type
, struct snd_card
*card
, int dev
)
207 case SNDRV_DEVICE_TYPE_SEQUENCER
:
208 case SNDRV_DEVICE_TYPE_TIMER
:
211 case SNDRV_DEVICE_TYPE_CONTROL
:
212 snd_assert(card
!= NULL
, return -EINVAL
);
213 minor
= SNDRV_MINOR(card
->number
, type
);
215 case SNDRV_DEVICE_TYPE_HWDEP
:
216 case SNDRV_DEVICE_TYPE_RAWMIDI
:
217 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK
:
218 case SNDRV_DEVICE_TYPE_PCM_CAPTURE
:
219 snd_assert(card
!= NULL
, return -EINVAL
);
220 minor
= SNDRV_MINOR(card
->number
, type
+ dev
);
225 snd_assert(minor
>= 0 && minor
< SNDRV_OS_MINORS
, return -EINVAL
);
231 * snd_register_device - Register the ALSA device file for the card
232 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
233 * @card: the card instance
234 * @dev: the device index
235 * @f_ops: the file operations
236 * @private_data: user pointer for f_ops->open()
237 * @name: the device file name
239 * Registers an ALSA device file for the given card.
240 * The operators have to be set in reg parameter.
242 * Retrurns zero if successful, or a negative error code on failure.
244 int snd_register_device(int type
, struct snd_card
*card
, int dev
,
245 const struct file_operations
*f_ops
, void *private_data
,
249 struct snd_minor
*preg
;
250 struct device
*device
= NULL
;
252 snd_assert(name
, return -EINVAL
);
253 preg
= kmalloc(sizeof(struct snd_minor
) + strlen(name
) + 1, GFP_KERNEL
);
257 preg
->card
= card
? card
->number
: -1;
260 preg
->private_data
= private_data
;
261 strcpy(preg
->name
, name
);
262 mutex_lock(&sound_mutex
);
263 #ifdef CONFIG_SND_DYNAMIC_MINORS
264 minor
= snd_find_free_minor();
266 minor
= snd_kernel_minor(type
, card
, dev
);
267 if (minor
>= 0 && snd_minors
[minor
])
271 mutex_unlock(&sound_mutex
);
275 snd_minors
[minor
] = preg
;
276 if (type
!= SNDRV_DEVICE_TYPE_CONTROL
|| preg
->card
>= cards_limit
)
277 devfs_mk_cdev(MKDEV(major
, minor
), S_IFCHR
| device_mode
, "snd/%s", name
);
280 class_device_create(sound_class
, NULL
, MKDEV(major
, minor
), device
, "%s", name
);
282 mutex_unlock(&sound_mutex
);
286 EXPORT_SYMBOL(snd_register_device
);
289 * snd_unregister_device - unregister the device on the given card
290 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
291 * @card: the card instance
292 * @dev: the device index
294 * Unregisters the device file already registered via
295 * snd_register_device().
297 * Returns zero if sucecessful, or a negative error code on failure
299 int snd_unregister_device(int type
, struct snd_card
*card
, int dev
)
302 struct snd_minor
*mptr
;
304 cardnum
= card
? card
->number
: -1;
305 mutex_lock(&sound_mutex
);
306 for (minor
= 0; minor
< ARRAY_SIZE(snd_minors
); ++minor
)
307 if ((mptr
= snd_minors
[minor
]) != NULL
&&
308 mptr
->type
== type
&&
309 mptr
->card
== cardnum
&&
312 if (minor
== ARRAY_SIZE(snd_minors
)) {
313 mutex_unlock(&sound_mutex
);
317 if (mptr
->type
!= SNDRV_DEVICE_TYPE_CONTROL
||
318 mptr
->card
>= cards_limit
) /* created in sound.c */
319 devfs_remove("snd/%s", mptr
->name
);
320 class_device_destroy(sound_class
, MKDEV(major
, minor
));
322 snd_minors
[minor
] = NULL
;
323 mutex_unlock(&sound_mutex
);
328 EXPORT_SYMBOL(snd_unregister_device
);
330 #ifdef CONFIG_PROC_FS
335 static struct snd_info_entry
*snd_minor_info_entry
= NULL
;
337 static const char *snd_device_type_name(int type
)
340 case SNDRV_DEVICE_TYPE_CONTROL
:
342 case SNDRV_DEVICE_TYPE_HWDEP
:
343 return "hardware dependent";
344 case SNDRV_DEVICE_TYPE_RAWMIDI
:
346 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK
:
347 return "digital audio playback";
348 case SNDRV_DEVICE_TYPE_PCM_CAPTURE
:
349 return "digital audio capture";
350 case SNDRV_DEVICE_TYPE_SEQUENCER
:
352 case SNDRV_DEVICE_TYPE_TIMER
:
359 static void snd_minor_info_read(struct snd_info_entry
*entry
, struct snd_info_buffer
*buffer
)
362 struct snd_minor
*mptr
;
364 mutex_lock(&sound_mutex
);
365 for (minor
= 0; minor
< SNDRV_OS_MINORS
; ++minor
) {
366 if (!(mptr
= snd_minors
[minor
]))
368 if (mptr
->card
>= 0) {
369 if (mptr
->device
>= 0)
370 snd_iprintf(buffer
, "%3i: [%2i-%2i]: %s\n",
371 minor
, mptr
->card
, mptr
->device
,
372 snd_device_type_name(mptr
->type
));
374 snd_iprintf(buffer
, "%3i: [%2i] : %s\n",
376 snd_device_type_name(mptr
->type
));
378 snd_iprintf(buffer
, "%3i: : %s\n", minor
,
379 snd_device_type_name(mptr
->type
));
381 mutex_unlock(&sound_mutex
);
384 int __init
snd_minor_info_init(void)
386 struct snd_info_entry
*entry
;
388 entry
= snd_info_create_module_entry(THIS_MODULE
, "devices", NULL
);
390 entry
->c
.text
.read
= snd_minor_info_read
;
391 if (snd_info_register(entry
) < 0) {
392 snd_info_free_entry(entry
);
396 snd_minor_info_entry
= entry
;
400 int __exit
snd_minor_info_done(void)
402 if (snd_minor_info_entry
)
403 snd_info_unregister(snd_minor_info_entry
);
406 #endif /* CONFIG_PROC_FS */
412 static int __init
alsa_sound_init(void)
417 snd_ecards_limit
= cards_limit
;
419 if (register_chrdev(major
, "alsa", &snd_fops
)) {
420 snd_printk(KERN_ERR
"unable to register native major device number %d\n", major
);
424 if (snd_info_init() < 0) {
425 unregister_chrdev(major
, "alsa");
429 snd_info_minor_register();
430 for (controlnum
= 0; controlnum
< cards_limit
; controlnum
++)
431 devfs_mk_cdev(MKDEV(major
, controlnum
<<5), S_IFCHR
| device_mode
, "snd/controlC%d", controlnum
);
433 printk(KERN_INFO
"Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE
".\n");
438 static void __exit
alsa_sound_exit(void)
442 for (controlnum
= 0; controlnum
< cards_limit
; controlnum
++)
443 devfs_remove("snd/controlC%d", controlnum
);
445 snd_info_minor_unregister();
447 if (unregister_chrdev(major
, "alsa") != 0)
448 snd_printk(KERN_ERR
"unable to unregister major device number %d\n", major
);
452 module_init(alsa_sound_init
)
453 module_exit(alsa_sound_exit
)