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))
106 init_waitqueue_entry(&wait, current);
107 add_wait_queue(&hw->open_wait, &wait);
108 mutex_lock(&hw->open_mutex);
110 if (hw->exclusive && hw->used > 0) {
118 err = hw->ops.open(hw, file);
121 if (err == -EAGAIN) {
122 if (file->f_flags & O_NONBLOCK) {
128 set_current_state(TASK_INTERRUPTIBLE);
129 mutex_unlock(&hw->open_mutex);
131 mutex_lock(&hw->open_mutex);
132 if (signal_pending(current)) {
137 remove_wait_queue(&hw->open_wait, &wait);
139 err = snd_card_file_add(hw->card, file);
141 file->private_data = hw;
145 hw->ops.release(hw, file);
148 mutex_unlock(&hw->open_mutex);
150 module_put(hw->card->module);
154 static int snd_hwdep_release(struct inode *inode, struct file * file)
157 struct snd_hwdep *hw = file->private_data;
158 struct module *mod = hw->card->module;
160 mutex_lock(&hw->open_mutex);
162 err = hw->ops.release(hw, file);
165 mutex_unlock(&hw->open_mutex);
166 wake_up(&hw->open_wait);
168 snd_card_file_remove(hw->card, file);
173 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
175 struct snd_hwdep *hw = file->private_data;
177 return hw->ops.poll(hw, file, wait);
181 static int snd_hwdep_info(struct snd_hwdep *hw,
182 struct snd_hwdep_info __user *_info)
184 struct snd_hwdep_info info;
186 memset(&info, 0, sizeof(info));
187 info.card = hw->card->number;
188 strlcpy(info.id, hw->id, sizeof(info.id));
189 strlcpy(info.name, hw->name, sizeof(info.name));
190 info.iface = hw->iface;
191 if (copy_to_user(_info, &info, sizeof(info)))
196 static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
197 struct snd_hwdep_dsp_status __user *_info)
199 struct snd_hwdep_dsp_status info;
202 if (! hw->ops.dsp_status)
204 memset(&info, 0, sizeof(info));
205 info.dsp_loaded = hw->dsp_loaded;
206 if ((err = hw->ops.dsp_status(hw, &info)) < 0)
208 if (copy_to_user(_info, &info, sizeof(info)))
213 static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
214 struct snd_hwdep_dsp_image __user *_info)
216 struct snd_hwdep_dsp_image info;
219 if (! hw->ops.dsp_load)
221 memset(&info, 0, sizeof(info));
222 if (copy_from_user(&info, _info, sizeof(info)))
224 /* check whether the dsp was already loaded */
225 if (hw->dsp_loaded & (1 << info.index))
227 if (!access_ok(VERIFY_READ, info.image, info.length))
229 err = hw->ops.dsp_load(hw, &info);
232 hw->dsp_loaded |= (1 << info.index);
236 static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
239 struct snd_hwdep *hw = file->private_data;
240 void __user *argp = (void __user *)arg;
242 case SNDRV_HWDEP_IOCTL_PVERSION:
243 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
244 case SNDRV_HWDEP_IOCTL_INFO:
245 return snd_hwdep_info(hw, argp);
246 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
247 return snd_hwdep_dsp_status(hw, argp);
248 case SNDRV_HWDEP_IOCTL_DSP_LOAD:
249 return snd_hwdep_dsp_load(hw, argp);
252 return hw->ops.ioctl(hw, file, cmd, arg);
256 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
258 struct snd_hwdep *hw = file->private_data;
260 return hw->ops.mmap(hw, file, vma);
264 static int snd_hwdep_control_ioctl(struct snd_card *card,
265 struct snd_ctl_file * control,
266 unsigned int cmd, unsigned long arg)
269 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
273 if (get_user(device, (int __user *)arg))
275 mutex_lock(®ister_mutex);
276 device = device < 0 ? 0 : device + 1;
277 while (device < SNDRV_MINOR_HWDEPS) {
278 if (snd_hwdep_search(card, device))
282 if (device >= SNDRV_MINOR_HWDEPS)
284 mutex_unlock(®ister_mutex);
285 if (put_user(device, (int __user *)arg))
289 case SNDRV_CTL_IOCTL_HWDEP_INFO:
291 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
293 struct snd_hwdep *hwdep;
295 if (get_user(device, &info->device))
297 mutex_lock(®ister_mutex);
298 hwdep = snd_hwdep_search(card, device);
300 err = snd_hwdep_info(hwdep, info);
303 mutex_unlock(®ister_mutex);
311 #include "hwdep_compat.c"
313 #define snd_hwdep_ioctl_compat NULL
320 static const struct file_operations snd_hwdep_f_ops =
322 .owner = THIS_MODULE,
323 .llseek = snd_hwdep_llseek,
324 .read = snd_hwdep_read,
325 .write = snd_hwdep_write,
326 .open = snd_hwdep_open,
327 .release = snd_hwdep_release,
328 .poll = snd_hwdep_poll,
329 .unlocked_ioctl = snd_hwdep_ioctl,
330 .compat_ioctl = snd_hwdep_ioctl_compat,
331 .mmap = snd_hwdep_mmap,
335 * snd_hwdep_new - create a new hwdep instance
336 * @card: the card instance
338 * @device: the device index (zero-based)
339 * @rhwdep: the pointer to store the new hwdep instance
341 * Creates a new hwdep instance with the given index on the card.
342 * The callbacks (hwdep->ops) must be set on the returned instance
343 * after this call manually by the caller.
345 * Returns zero if successful, or a negative error code on failure.
347 int snd_hwdep_new(struct snd_card *card, char *id, int device,
348 struct snd_hwdep **rhwdep)
350 struct snd_hwdep *hwdep;
352 static struct snd_device_ops ops = {
353 .dev_free = snd_hwdep_dev_free,
354 .dev_register = snd_hwdep_dev_register,
355 .dev_disconnect = snd_hwdep_dev_disconnect,
358 if (snd_BUG_ON(!card))
362 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
364 snd_printk(KERN_ERR "hwdep: cannot allocate\n");
368 hwdep->device = device;
370 strlcpy(hwdep->id, id, sizeof(hwdep->id));
371 #ifdef CONFIG_SND_OSSEMUL
372 hwdep->oss_type = -1;
374 if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
375 snd_hwdep_free(hwdep);
378 init_waitqueue_head(&hwdep->open_wait);
379 mutex_init(&hwdep->open_mutex);
385 static int snd_hwdep_free(struct snd_hwdep *hwdep)
389 if (hwdep->private_free)
390 hwdep->private_free(hwdep);
395 static int snd_hwdep_dev_free(struct snd_device *device)
397 struct snd_hwdep *hwdep = device->device_data;
398 return snd_hwdep_free(hwdep);
401 static int snd_hwdep_dev_register(struct snd_device *device)
403 struct snd_hwdep *hwdep = device->device_data;
407 mutex_lock(®ister_mutex);
408 if (snd_hwdep_search(hwdep->card, hwdep->device)) {
409 mutex_unlock(®ister_mutex);
412 list_add_tail(&hwdep->list, &snd_hwdep_devices);
413 sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
414 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
415 hwdep->card, hwdep->device,
416 &snd_hwdep_f_ops, hwdep, name)) < 0) {
417 snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
418 hwdep->card->number, hwdep->device);
419 list_del(&hwdep->list);
420 mutex_unlock(®ister_mutex);
423 #ifdef CONFIG_SND_OSSEMUL
425 if (hwdep->oss_type >= 0) {
426 if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
427 snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
429 if (snd_register_oss_device(hwdep->oss_type,
430 hwdep->card, hwdep->device,
431 &snd_hwdep_f_ops, hwdep,
432 hwdep->oss_dev) < 0) {
433 snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
434 hwdep->card->number, hwdep->device);
440 mutex_unlock(®ister_mutex);
444 static int snd_hwdep_dev_disconnect(struct snd_device *device)
446 struct snd_hwdep *hwdep = device->device_data;
448 if (snd_BUG_ON(!hwdep))
450 mutex_lock(®ister_mutex);
451 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
452 mutex_unlock(®ister_mutex);
455 #ifdef CONFIG_SND_OSSEMUL
457 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
459 snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
460 list_del_init(&hwdep->list);
461 mutex_unlock(®ister_mutex);
465 #ifdef CONFIG_PROC_FS
470 static void snd_hwdep_proc_read(struct snd_info_entry *entry,
471 struct snd_info_buffer *buffer)
473 struct snd_hwdep *hwdep;
475 mutex_lock(®ister_mutex);
476 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
477 snd_iprintf(buffer, "%02i-%02i: %s\n",
478 hwdep->card->number, hwdep->device, hwdep->name);
479 mutex_unlock(®ister_mutex);
482 static struct snd_info_entry *snd_hwdep_proc_entry;
484 static void __init snd_hwdep_proc_init(void)
486 struct snd_info_entry *entry;
488 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
489 entry->c.text.read = snd_hwdep_proc_read;
490 if (snd_info_register(entry) < 0) {
491 snd_info_free_entry(entry);
495 snd_hwdep_proc_entry = entry;
498 static void __exit snd_hwdep_proc_done(void)
500 snd_info_free_entry(snd_hwdep_proc_entry);
502 #else /* !CONFIG_PROC_FS */
503 #define snd_hwdep_proc_init()
504 #define snd_hwdep_proc_done()
505 #endif /* CONFIG_PROC_FS */
512 static int __init alsa_hwdep_init(void)
514 snd_hwdep_proc_init();
515 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
516 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
520 static void __exit alsa_hwdep_exit(void)
522 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
523 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
524 snd_hwdep_proc_done();
527 module_init(alsa_hwdep_init)
528 module_exit(alsa_hwdep_exit)
530 EXPORT_SYMBOL(snd_hwdep_new);