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