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1da177e4 LT |
1 | /* |
2 | * Advanced Linux Sound Architecture | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
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> | |
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> | |
34 | #include <linux/devfs_fs_kernel.h> | |
35 | #include <linux/device.h> | |
36 | ||
37 | #define SNDRV_OS_MINORS 256 | |
38 | ||
39 | static int major = CONFIG_SND_MAJOR; | |
40 | int snd_major; | |
41 | static int cards_limit = 1; | |
42 | static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
43 | ||
44 | MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>"); | |
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."); | |
51 | #ifdef CONFIG_DEVFS_FS | |
52 | module_param(device_mode, int, 0444); | |
53 | MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs."); | |
54 | #endif | |
55 | MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR); | |
56 | ||
57 | /* this one holds the actual max. card number currently available. | |
58 | * as default, it's identical with cards_limit option. when more | |
59 | * modules are loaded manually, this limit number increases, too. | |
60 | */ | |
61 | int snd_ecards_limit; | |
62 | ||
63 | static struct list_head snd_minors_hash[SNDRV_CARDS]; | |
64 | ||
65 | static DECLARE_MUTEX(sound_mutex); | |
66 | ||
619e666b | 67 | extern struct class *sound_class; |
1da177e4 LT |
68 | |
69 | ||
70 | #ifdef CONFIG_KMOD | |
71 | ||
72 | /** | |
73 | * snd_request_card - try to load the card module | |
74 | * @card: the card number | |
75 | * | |
76 | * Tries to load the module "snd-card-X" for the given card number | |
77 | * via KMOD. Returns immediately if already loaded. | |
78 | */ | |
79 | void snd_request_card(int card) | |
80 | { | |
81 | int locked; | |
82 | ||
83 | if (! current->fs->root) | |
84 | return; | |
85 | read_lock(&snd_card_rwlock); | |
86 | locked = snd_cards_lock & (1 << card); | |
87 | read_unlock(&snd_card_rwlock); | |
88 | if (locked) | |
89 | return; | |
90 | if (card < 0 || card >= cards_limit) | |
91 | return; | |
92 | request_module("snd-card-%i", card); | |
93 | } | |
94 | ||
95 | static void snd_request_other(int minor) | |
96 | { | |
97 | char *str; | |
98 | ||
99 | if (! current->fs->root) | |
100 | return; | |
101 | switch (minor) { | |
102 | case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break; | |
103 | case SNDRV_MINOR_TIMER: str = "snd-timer"; break; | |
104 | default: return; | |
105 | } | |
106 | request_module(str); | |
107 | } | |
108 | ||
109 | #endif /* request_module support */ | |
110 | ||
111 | static snd_minor_t *snd_minor_search(int minor) | |
112 | { | |
113 | struct list_head *list; | |
114 | snd_minor_t *mptr; | |
115 | ||
116 | list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) { | |
117 | mptr = list_entry(list, snd_minor_t, list); | |
118 | if (mptr->number == minor) | |
119 | return mptr; | |
120 | } | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | static int snd_open(struct inode *inode, struct file *file) | |
125 | { | |
126 | int minor = iminor(inode); | |
127 | int card = SNDRV_MINOR_CARD(minor); | |
128 | int dev = SNDRV_MINOR_DEVICE(minor); | |
129 | snd_minor_t *mptr = NULL; | |
130 | struct file_operations *old_fops; | |
131 | int err = 0; | |
132 | ||
133 | if (dev != SNDRV_MINOR_SEQUENCER && dev != SNDRV_MINOR_TIMER) { | |
134 | if (snd_cards[card] == NULL) { | |
135 | #ifdef CONFIG_KMOD | |
136 | snd_request_card(card); | |
137 | if (snd_cards[card] == NULL) | |
138 | #endif | |
139 | return -ENODEV; | |
140 | } | |
141 | } else { | |
142 | #ifdef CONFIG_KMOD | |
143 | if ((mptr = snd_minor_search(minor)) == NULL) | |
144 | snd_request_other(minor); | |
145 | #endif | |
146 | } | |
147 | if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL) | |
148 | return -ENODEV; | |
149 | old_fops = file->f_op; | |
150 | file->f_op = fops_get(mptr->f_ops); | |
151 | if (file->f_op->open) | |
152 | err = file->f_op->open(inode, file); | |
153 | if (err) { | |
154 | fops_put(file->f_op); | |
155 | file->f_op = fops_get(old_fops); | |
156 | } | |
157 | fops_put(old_fops); | |
158 | return err; | |
159 | } | |
160 | ||
161 | static struct file_operations snd_fops = | |
162 | { | |
163 | .owner = THIS_MODULE, | |
164 | .open = snd_open | |
165 | }; | |
166 | ||
167 | static int snd_kernel_minor(int type, snd_card_t * card, int dev) | |
168 | { | |
169 | int minor; | |
170 | ||
171 | switch (type) { | |
172 | case SNDRV_DEVICE_TYPE_SEQUENCER: | |
173 | case SNDRV_DEVICE_TYPE_TIMER: | |
174 | minor = type; | |
175 | break; | |
176 | case SNDRV_DEVICE_TYPE_CONTROL: | |
177 | snd_assert(card != NULL, return -EINVAL); | |
178 | minor = SNDRV_MINOR(card->number, type); | |
179 | break; | |
180 | case SNDRV_DEVICE_TYPE_HWDEP: | |
181 | case SNDRV_DEVICE_TYPE_RAWMIDI: | |
182 | case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: | |
183 | case SNDRV_DEVICE_TYPE_PCM_CAPTURE: | |
184 | snd_assert(card != NULL, return -EINVAL); | |
185 | minor = SNDRV_MINOR(card->number, type + dev); | |
186 | break; | |
187 | default: | |
188 | return -EINVAL; | |
189 | } | |
190 | snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL); | |
191 | return minor; | |
192 | } | |
193 | ||
194 | /** | |
195 | * snd_register_device - Register the ALSA device file for the card | |
196 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX | |
197 | * @card: the card instance | |
198 | * @dev: the device index | |
199 | * @reg: the snd_minor_t record | |
200 | * @name: the device file name | |
201 | * | |
202 | * Registers an ALSA device file for the given card. | |
203 | * The operators have to be set in reg parameter. | |
204 | * | |
205 | * Retrurns zero if successful, or a negative error code on failure. | |
206 | */ | |
207 | int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name) | |
208 | { | |
209 | int minor = snd_kernel_minor(type, card, dev); | |
210 | snd_minor_t *preg; | |
211 | struct device *device = NULL; | |
212 | ||
213 | if (minor < 0) | |
214 | return minor; | |
215 | snd_assert(name, return -EINVAL); | |
216 | preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL); | |
217 | if (preg == NULL) | |
218 | return -ENOMEM; | |
219 | *preg = *reg; | |
220 | preg->number = minor; | |
221 | preg->device = dev; | |
222 | strcpy(preg->name, name); | |
223 | down(&sound_mutex); | |
224 | if (snd_minor_search(minor)) { | |
225 | up(&sound_mutex); | |
226 | kfree(preg); | |
227 | return -EBUSY; | |
228 | } | |
229 | list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]); | |
230 | if (strncmp(name, "controlC", 8) || card->number >= cards_limit) | |
231 | devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name); | |
232 | if (card) | |
233 | device = card->dev; | |
619e666b | 234 | class_device_create(sound_class, MKDEV(major, minor), device, "%s", name); |
1da177e4 LT |
235 | |
236 | up(&sound_mutex); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | /** | |
241 | * snd_unregister_device - unregister the device on the given card | |
242 | * @type: the device type, SNDRV_DEVICE_TYPE_XXX | |
243 | * @card: the card instance | |
244 | * @dev: the device index | |
245 | * | |
246 | * Unregisters the device file already registered via | |
247 | * snd_register_device(). | |
248 | * | |
249 | * Returns zero if sucecessful, or a negative error code on failure | |
250 | */ | |
251 | int snd_unregister_device(int type, snd_card_t * card, int dev) | |
252 | { | |
253 | int minor = snd_kernel_minor(type, card, dev); | |
254 | snd_minor_t *mptr; | |
255 | ||
256 | if (minor < 0) | |
257 | return minor; | |
258 | down(&sound_mutex); | |
259 | if ((mptr = snd_minor_search(minor)) == NULL) { | |
260 | up(&sound_mutex); | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
264 | if (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) /* created in sound.c */ | |
265 | devfs_remove("snd/%s", mptr->name); | |
619e666b | 266 | class_device_destroy(sound_class, MKDEV(major, minor)); |
1da177e4 LT |
267 | |
268 | list_del(&mptr->list); | |
269 | up(&sound_mutex); | |
270 | kfree(mptr); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | /* | |
275 | * INFO PART | |
276 | */ | |
277 | ||
278 | static snd_info_entry_t *snd_minor_info_entry = NULL; | |
279 | ||
280 | static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) | |
281 | { | |
282 | int card, device; | |
283 | struct list_head *list; | |
284 | snd_minor_t *mptr; | |
285 | ||
286 | down(&sound_mutex); | |
287 | for (card = 0; card < SNDRV_CARDS; card++) { | |
288 | list_for_each(list, &snd_minors_hash[card]) { | |
289 | mptr = list_entry(list, snd_minor_t, list); | |
290 | if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_SEQUENCER) { | |
291 | if ((device = mptr->device) >= 0) | |
292 | snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment); | |
293 | else | |
294 | snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, mptr->comment); | |
295 | } else { | |
296 | snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment); | |
297 | } | |
298 | } | |
299 | } | |
300 | up(&sound_mutex); | |
301 | } | |
302 | ||
303 | int __init snd_minor_info_init(void) | |
304 | { | |
305 | snd_info_entry_t *entry; | |
306 | ||
307 | entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL); | |
308 | if (entry) { | |
309 | entry->c.text.read_size = PAGE_SIZE; | |
310 | entry->c.text.read = snd_minor_info_read; | |
311 | if (snd_info_register(entry) < 0) { | |
312 | snd_info_free_entry(entry); | |
313 | entry = NULL; | |
314 | } | |
315 | } | |
316 | snd_minor_info_entry = entry; | |
317 | return 0; | |
318 | } | |
319 | ||
320 | int __exit snd_minor_info_done(void) | |
321 | { | |
322 | if (snd_minor_info_entry) | |
323 | snd_info_unregister(snd_minor_info_entry); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * INIT PART | |
329 | */ | |
330 | ||
331 | static int __init alsa_sound_init(void) | |
332 | { | |
333 | short controlnum; | |
334 | int err; | |
335 | int card; | |
336 | ||
337 | snd_major = major; | |
338 | snd_ecards_limit = cards_limit; | |
339 | for (card = 0; card < SNDRV_CARDS; card++) | |
340 | INIT_LIST_HEAD(&snd_minors_hash[card]); | |
341 | if ((err = snd_oss_init_module()) < 0) | |
342 | return err; | |
343 | devfs_mk_dir("snd"); | |
344 | if (register_chrdev(major, "alsa", &snd_fops)) { | |
345 | snd_printk(KERN_ERR "unable to register native major device number %d\n", major); | |
346 | devfs_remove("snd"); | |
347 | return -EIO; | |
348 | } | |
349 | snd_memory_init(); | |
350 | if (snd_info_init() < 0) { | |
351 | snd_memory_done(); | |
352 | unregister_chrdev(major, "alsa"); | |
353 | devfs_remove("snd"); | |
354 | return -ENOMEM; | |
355 | } | |
356 | snd_info_minor_register(); | |
357 | for (controlnum = 0; controlnum < cards_limit; controlnum++) | |
358 | devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum); | |
359 | #ifndef MODULE | |
360 | printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"); | |
361 | #endif | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static void __exit alsa_sound_exit(void) | |
366 | { | |
367 | short controlnum; | |
368 | ||
369 | for (controlnum = 0; controlnum < cards_limit; controlnum++) | |
370 | devfs_remove("snd/controlC%d", controlnum); | |
371 | ||
372 | snd_info_minor_unregister(); | |
373 | snd_info_done(); | |
374 | snd_memory_done(); | |
375 | if (unregister_chrdev(major, "alsa") != 0) | |
376 | snd_printk(KERN_ERR "unable to unregister major device number %d\n", major); | |
377 | devfs_remove("snd"); | |
378 | } | |
379 | ||
380 | module_init(alsa_sound_init) | |
381 | module_exit(alsa_sound_exit) | |
382 | ||
383 | /* sound.c */ | |
384 | EXPORT_SYMBOL(snd_major); | |
385 | EXPORT_SYMBOL(snd_ecards_limit); | |
386 | #if defined(CONFIG_KMOD) | |
387 | EXPORT_SYMBOL(snd_request_card); | |
388 | #endif | |
389 | EXPORT_SYMBOL(snd_register_device); | |
390 | EXPORT_SYMBOL(snd_unregister_device); | |
391 | #if defined(CONFIG_SND_OSSEMUL) | |
392 | EXPORT_SYMBOL(snd_register_oss_device); | |
393 | EXPORT_SYMBOL(snd_unregister_oss_device); | |
394 | #endif | |
395 | /* memory.c */ | |
396 | #ifdef CONFIG_SND_DEBUG_MEMORY | |
397 | EXPORT_SYMBOL(snd_hidden_kmalloc); | |
398 | EXPORT_SYMBOL(snd_hidden_kcalloc); | |
399 | EXPORT_SYMBOL(snd_hidden_kfree); | |
400 | EXPORT_SYMBOL(snd_hidden_vmalloc); | |
401 | EXPORT_SYMBOL(snd_hidden_vfree); | |
543537bd | 402 | EXPORT_SYMBOL(snd_hidden_kstrdup); |
1da177e4 | 403 | #endif |
1da177e4 LT |
404 | EXPORT_SYMBOL(copy_to_user_fromio); |
405 | EXPORT_SYMBOL(copy_from_user_toio); | |
406 | /* init.c */ | |
407 | EXPORT_SYMBOL(snd_cards); | |
408 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
409 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); | |
410 | #endif | |
411 | EXPORT_SYMBOL(snd_card_new); | |
412 | EXPORT_SYMBOL(snd_card_disconnect); | |
413 | EXPORT_SYMBOL(snd_card_free); | |
414 | EXPORT_SYMBOL(snd_card_free_in_thread); | |
415 | EXPORT_SYMBOL(snd_card_register); | |
416 | EXPORT_SYMBOL(snd_component_add); | |
417 | EXPORT_SYMBOL(snd_card_file_add); | |
418 | EXPORT_SYMBOL(snd_card_file_remove); | |
419 | #ifdef CONFIG_PM | |
420 | EXPORT_SYMBOL(snd_power_wait); | |
421 | EXPORT_SYMBOL(snd_card_set_pm_callback); | |
422 | #if defined(CONFIG_PM) && defined(CONFIG_SND_GENERIC_PM) | |
423 | EXPORT_SYMBOL(snd_card_set_generic_pm_callback); | |
424 | #endif | |
425 | #ifdef CONFIG_PCI | |
426 | EXPORT_SYMBOL(snd_card_pci_suspend); | |
427 | EXPORT_SYMBOL(snd_card_pci_resume); | |
428 | #endif | |
429 | #endif | |
430 | /* device.c */ | |
431 | EXPORT_SYMBOL(snd_device_new); | |
432 | EXPORT_SYMBOL(snd_device_register); | |
433 | EXPORT_SYMBOL(snd_device_free); | |
1da177e4 | 434 | /* isadma.c */ |
276bd31c | 435 | #ifdef CONFIG_ISA_DMA_API |
1da177e4 LT |
436 | EXPORT_SYMBOL(snd_dma_program); |
437 | EXPORT_SYMBOL(snd_dma_disable); | |
438 | EXPORT_SYMBOL(snd_dma_pointer); | |
439 | #endif | |
440 | /* info.c */ | |
441 | #ifdef CONFIG_PROC_FS | |
442 | EXPORT_SYMBOL(snd_seq_root); | |
443 | EXPORT_SYMBOL(snd_iprintf); | |
444 | EXPORT_SYMBOL(snd_info_get_line); | |
445 | EXPORT_SYMBOL(snd_info_get_str); | |
446 | EXPORT_SYMBOL(snd_info_create_module_entry); | |
447 | EXPORT_SYMBOL(snd_info_create_card_entry); | |
448 | EXPORT_SYMBOL(snd_info_free_entry); | |
449 | EXPORT_SYMBOL(snd_info_register); | |
450 | EXPORT_SYMBOL(snd_info_unregister); | |
451 | EXPORT_SYMBOL(snd_card_proc_new); | |
452 | #endif | |
453 | /* info_oss.c */ | |
454 | #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) | |
455 | EXPORT_SYMBOL(snd_oss_info_register); | |
456 | #endif | |
457 | /* control.c */ | |
458 | EXPORT_SYMBOL(snd_ctl_new); | |
459 | EXPORT_SYMBOL(snd_ctl_new1); | |
460 | EXPORT_SYMBOL(snd_ctl_free_one); | |
461 | EXPORT_SYMBOL(snd_ctl_add); | |
462 | EXPORT_SYMBOL(snd_ctl_remove); | |
463 | EXPORT_SYMBOL(snd_ctl_remove_id); | |
464 | EXPORT_SYMBOL(snd_ctl_rename_id); | |
465 | EXPORT_SYMBOL(snd_ctl_find_numid); | |
466 | EXPORT_SYMBOL(snd_ctl_find_id); | |
467 | EXPORT_SYMBOL(snd_ctl_notify); | |
468 | EXPORT_SYMBOL(snd_ctl_register_ioctl); | |
469 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); | |
470 | #ifdef CONFIG_COMPAT | |
471 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
472 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); | |
473 | #endif | |
474 | EXPORT_SYMBOL(snd_ctl_elem_read); | |
475 | EXPORT_SYMBOL(snd_ctl_elem_write); | |
476 | /* misc.c */ | |
477 | EXPORT_SYMBOL(snd_task_name); | |
478 | #ifdef CONFIG_SND_VERBOSE_PRINTK | |
479 | EXPORT_SYMBOL(snd_verbose_printk); | |
480 | #endif | |
481 | #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK) | |
482 | EXPORT_SYMBOL(snd_verbose_printd); | |
483 | #endif | |
484 | /* wrappers */ | |
485 | #ifdef CONFIG_SND_DEBUG_MEMORY | |
486 | EXPORT_SYMBOL(snd_wrapper_kmalloc); | |
487 | EXPORT_SYMBOL(snd_wrapper_kfree); | |
488 | EXPORT_SYMBOL(snd_wrapper_vmalloc); | |
489 | EXPORT_SYMBOL(snd_wrapper_vfree); | |
490 | #endif |