2 * Hardware dependent layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/major.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/module.h>
28 #include <sound/core.h>
29 #include <sound/control.h>
30 #include <sound/minors.h>
31 #include <sound/hwdep.h>
32 #include <sound/info.h>
34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
35 MODULE_DESCRIPTION("Hardware dependent layer");
36 MODULE_LICENSE("GPL");
38 static LIST_HEAD(snd_hwdep_devices);
39 static DEFINE_MUTEX(register_mutex);
41 static int snd_hwdep_free(struct snd_hwdep *hwdep);
42 static int snd_hwdep_dev_free(struct snd_device *device);
43 static int snd_hwdep_dev_register(struct snd_device *device);
44 static int snd_hwdep_dev_disconnect(struct snd_device *device);
47 static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
49 struct snd_hwdep *hwdep;
51 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
52 if (hwdep->card == card && hwdep->device == device)
57 static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
59 struct snd_hwdep *hw = file->private_data;
61 return hw->ops.llseek(hw, file, offset, orig);
65 static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
66 size_t count, loff_t *offset)
68 struct snd_hwdep *hw = file->private_data;
70 return hw->ops.read(hw, buf, count, offset);
74 static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
75 size_t count, loff_t *offset)
77 struct snd_hwdep *hw = file->private_data;
79 return hw->ops.write(hw, buf, count, offset);
83 static int snd_hwdep_open(struct inode *inode, struct file * file)
85 int major = imajor(inode);
90 if (major == snd_major) {
91 hw = snd_lookup_minor_data(iminor(inode),
92 SNDRV_DEVICE_TYPE_HWDEP);
93 #ifdef CONFIG_SND_OSSEMUL
94 } else if (major == SOUND_MAJOR) {
95 hw = snd_lookup_oss_minor_data(iminor(inode),
96 SNDRV_OSS_DEVICE_TYPE_DMFM);
103 if (!try_module_get(hw->card->module)) {
104 snd_card_unref(hw->card);
108 init_waitqueue_entry(&wait, current);
109 add_wait_queue(&hw->open_wait, &wait);
110 mutex_lock(&hw->open_mutex);
112 if (hw->exclusive && hw->used > 0) {
120 err = hw->ops.open(hw, file);
123 if (err == -EAGAIN) {
124 if (file->f_flags & O_NONBLOCK) {
130 set_current_state(TASK_INTERRUPTIBLE);
131 mutex_unlock(&hw->open_mutex);
133 mutex_lock(&hw->open_mutex);
134 if (signal_pending(current)) {
139 remove_wait_queue(&hw->open_wait, &wait);
141 err = snd_card_file_add(hw->card, file);
143 file->private_data = hw;
147 hw->ops.release(hw, file);
150 mutex_unlock(&hw->open_mutex);
152 module_put(hw->card->module);
153 snd_card_unref(hw->card);
157 static int snd_hwdep_release(struct inode *inode, struct file * file)
160 struct snd_hwdep *hw = file->private_data;
161 struct module *mod = hw->card->module;
163 mutex_lock(&hw->open_mutex);
165 err = hw->ops.release(hw, file);
168 mutex_unlock(&hw->open_mutex);
169 wake_up(&hw->open_wait);
171 snd_card_file_remove(hw->card, file);
176 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
178 struct snd_hwdep *hw = file->private_data;
180 return hw->ops.poll(hw, file, wait);
184 static int snd_hwdep_info(struct snd_hwdep *hw,
185 struct snd_hwdep_info __user *_info)
187 struct snd_hwdep_info info;
189 memset(&info, 0, sizeof(info));
190 info.card = hw->card->number;
191 strlcpy(info.id, hw->id, sizeof(info.id));
192 strlcpy(info.name, hw->name, sizeof(info.name));
193 info.iface = hw->iface;
194 if (copy_to_user(_info, &info, sizeof(info)))
199 static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
200 struct snd_hwdep_dsp_status __user *_info)
202 struct snd_hwdep_dsp_status info;
205 if (! hw->ops.dsp_status)
207 memset(&info, 0, sizeof(info));
208 info.dsp_loaded = hw->dsp_loaded;
209 if ((err = hw->ops.dsp_status(hw, &info)) < 0)
211 if (copy_to_user(_info, &info, sizeof(info)))
216 static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
217 struct snd_hwdep_dsp_image __user *_info)
219 struct snd_hwdep_dsp_image info;
222 if (! hw->ops.dsp_load)
224 memset(&info, 0, sizeof(info));
225 if (copy_from_user(&info, _info, sizeof(info)))
227 /* check whether the dsp was already loaded */
228 if (hw->dsp_loaded & (1 << info.index))
230 if (!access_ok(VERIFY_READ, info.image, info.length))
232 err = hw->ops.dsp_load(hw, &info);
235 hw->dsp_loaded |= (1 << info.index);
239 static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
242 struct snd_hwdep *hw = file->private_data;
243 void __user *argp = (void __user *)arg;
245 case SNDRV_HWDEP_IOCTL_PVERSION:
246 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
247 case SNDRV_HWDEP_IOCTL_INFO:
248 return snd_hwdep_info(hw, argp);
249 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
250 return snd_hwdep_dsp_status(hw, argp);
251 case SNDRV_HWDEP_IOCTL_DSP_LOAD:
252 return snd_hwdep_dsp_load(hw, argp);
255 return hw->ops.ioctl(hw, file, cmd, arg);
259 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
261 struct snd_hwdep *hw = file->private_data;
263 return hw->ops.mmap(hw, file, vma);
267 static int snd_hwdep_control_ioctl(struct snd_card *card,
268 struct snd_ctl_file * control,
269 unsigned int cmd, unsigned long arg)
272 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
276 if (get_user(device, (int __user *)arg))
278 mutex_lock(®ister_mutex);
282 else if (device < SNDRV_MINOR_HWDEPS)
285 device = SNDRV_MINOR_HWDEPS;
287 while (device < SNDRV_MINOR_HWDEPS) {
288 if (snd_hwdep_search(card, device))
292 if (device >= SNDRV_MINOR_HWDEPS)
294 mutex_unlock(®ister_mutex);
295 if (put_user(device, (int __user *)arg))
299 case SNDRV_CTL_IOCTL_HWDEP_INFO:
301 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
303 struct snd_hwdep *hwdep;
305 if (get_user(device, &info->device))
307 mutex_lock(®ister_mutex);
308 hwdep = snd_hwdep_search(card, device);
310 err = snd_hwdep_info(hwdep, info);
313 mutex_unlock(®ister_mutex);
321 #include "hwdep_compat.c"
323 #define snd_hwdep_ioctl_compat NULL
330 static const struct file_operations snd_hwdep_f_ops =
332 .owner = THIS_MODULE,
333 .llseek = snd_hwdep_llseek,
334 .read = snd_hwdep_read,
335 .write = snd_hwdep_write,
336 .open = snd_hwdep_open,
337 .release = snd_hwdep_release,
338 .poll = snd_hwdep_poll,
339 .unlocked_ioctl = snd_hwdep_ioctl,
340 .compat_ioctl = snd_hwdep_ioctl_compat,
341 .mmap = snd_hwdep_mmap,
345 * snd_hwdep_new - create a new hwdep instance
346 * @card: the card instance
348 * @device: the device index (zero-based)
349 * @rhwdep: the pointer to store the new hwdep instance
351 * Creates a new hwdep instance with the given index on the card.
352 * The callbacks (hwdep->ops) must be set on the returned instance
353 * after this call manually by the caller.
355 * Returns zero if successful, or a negative error code on failure.
357 int snd_hwdep_new(struct snd_card *card, char *id, int device,
358 struct snd_hwdep **rhwdep)
360 struct snd_hwdep *hwdep;
362 static struct snd_device_ops ops = {
363 .dev_free = snd_hwdep_dev_free,
364 .dev_register = snd_hwdep_dev_register,
365 .dev_disconnect = snd_hwdep_dev_disconnect,
368 if (snd_BUG_ON(!card))
372 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
374 snd_printk(KERN_ERR "hwdep: cannot allocate\n");
378 hwdep->device = device;
380 strlcpy(hwdep->id, id, sizeof(hwdep->id));
381 #ifdef CONFIG_SND_OSSEMUL
382 hwdep->oss_type = -1;
384 if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
385 snd_hwdep_free(hwdep);
388 init_waitqueue_head(&hwdep->open_wait);
389 mutex_init(&hwdep->open_mutex);
395 static int snd_hwdep_free(struct snd_hwdep *hwdep)
399 if (hwdep->private_free)
400 hwdep->private_free(hwdep);
405 static int snd_hwdep_dev_free(struct snd_device *device)
407 struct snd_hwdep *hwdep = device->device_data;
408 return snd_hwdep_free(hwdep);
411 static int snd_hwdep_dev_register(struct snd_device *device)
413 struct snd_hwdep *hwdep = device->device_data;
417 mutex_lock(®ister_mutex);
418 if (snd_hwdep_search(hwdep->card, hwdep->device)) {
419 mutex_unlock(®ister_mutex);
422 list_add_tail(&hwdep->list, &snd_hwdep_devices);
423 sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
424 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
425 hwdep->card, hwdep->device,
426 &snd_hwdep_f_ops, hwdep, name)) < 0) {
427 snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
428 hwdep->card->number, hwdep->device);
429 list_del(&hwdep->list);
430 mutex_unlock(®ister_mutex);
433 #ifdef CONFIG_SND_OSSEMUL
435 if (hwdep->oss_type >= 0) {
436 if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
437 snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
439 if (snd_register_oss_device(hwdep->oss_type,
440 hwdep->card, hwdep->device,
441 &snd_hwdep_f_ops, hwdep,
442 hwdep->oss_dev) < 0) {
443 snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
444 hwdep->card->number, hwdep->device);
450 mutex_unlock(®ister_mutex);
454 static int snd_hwdep_dev_disconnect(struct snd_device *device)
456 struct snd_hwdep *hwdep = device->device_data;
458 if (snd_BUG_ON(!hwdep))
460 mutex_lock(®ister_mutex);
461 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
462 mutex_unlock(®ister_mutex);
465 #ifdef CONFIG_SND_OSSEMUL
467 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
469 snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
470 list_del_init(&hwdep->list);
471 mutex_unlock(®ister_mutex);
475 #ifdef CONFIG_PROC_FS
480 static void snd_hwdep_proc_read(struct snd_info_entry *entry,
481 struct snd_info_buffer *buffer)
483 struct snd_hwdep *hwdep;
485 mutex_lock(®ister_mutex);
486 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
487 snd_iprintf(buffer, "%02i-%02i: %s\n",
488 hwdep->card->number, hwdep->device, hwdep->name);
489 mutex_unlock(®ister_mutex);
492 static struct snd_info_entry *snd_hwdep_proc_entry;
494 static void __init snd_hwdep_proc_init(void)
496 struct snd_info_entry *entry;
498 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
499 entry->c.text.read = snd_hwdep_proc_read;
500 if (snd_info_register(entry) < 0) {
501 snd_info_free_entry(entry);
505 snd_hwdep_proc_entry = entry;
508 static void __exit snd_hwdep_proc_done(void)
510 snd_info_free_entry(snd_hwdep_proc_entry);
512 #else /* !CONFIG_PROC_FS */
513 #define snd_hwdep_proc_init()
514 #define snd_hwdep_proc_done()
515 #endif /* CONFIG_PROC_FS */
522 static int __init alsa_hwdep_init(void)
524 snd_hwdep_proc_init();
525 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
526 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
530 static void __exit alsa_hwdep_exit(void)
532 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
533 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
534 snd_hwdep_proc_done();
537 module_init(alsa_hwdep_init)
538 module_exit(alsa_hwdep_exit)
540 EXPORT_SYMBOL(snd_hwdep_new);