2 * Hardware dependent layer
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/major.h>
24 #include <linux/init.h>
25 #include <linux/smp_lock.h>
26 #include <linux/slab.h>
27 #include <linux/time.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@suse.cz>");
35 MODULE_DESCRIPTION("Hardware dependent layer");
36 MODULE_LICENSE("GPL");
38 snd_hwdep_t *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS];
40 static DECLARE_MUTEX(register_mutex);
42 static int snd_hwdep_free(snd_hwdep_t *hwdep);
43 static int snd_hwdep_dev_free(snd_device_t *device);
44 static int snd_hwdep_dev_register(snd_device_t *device);
45 static int snd_hwdep_dev_unregister(snd_device_t *device);
51 static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
53 snd_hwdep_t *hw = file->private_data;
55 return hw->ops.llseek(hw, file, offset, orig);
59 static ssize_t snd_hwdep_read(struct file * file, char __user *buf, size_t count, loff_t *offset)
61 snd_hwdep_t *hw = file->private_data;
63 return hw->ops.read(hw, buf, count, offset);
67 static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, size_t count, loff_t *offset)
69 snd_hwdep_t *hw = file->private_data;
71 return hw->ops.write(hw, buf, count, offset);
75 static int snd_hwdep_open(struct inode *inode, struct file * file)
77 int major = imajor(inode);
85 case CONFIG_SND_MAJOR:
86 cardnum = SNDRV_MINOR_CARD(iminor(inode));
87 device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
89 #ifdef CONFIG_SND_OSSEMUL
91 cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
98 cardnum %= SNDRV_CARDS;
99 device %= SNDRV_MINOR_HWDEPS;
100 hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device];
106 #ifdef CONFIG_SND_OSSEMUL
107 if (major == SOUND_MAJOR && hw->oss_type < 0)
111 if (!try_module_get(hw->card->module))
114 init_waitqueue_entry(&wait, current);
115 add_wait_queue(&hw->open_wait, &wait);
116 down(&hw->open_mutex);
118 if (hw->exclusive && hw->used > 0) {
122 err = hw->ops.open(hw, file);
125 if (err == -EAGAIN) {
126 if (file->f_flags & O_NONBLOCK) {
132 set_current_state(TASK_INTERRUPTIBLE);
135 down(&hw->open_mutex);
136 if (signal_pending(current)) {
141 remove_wait_queue(&hw->open_wait, &wait);
143 err = snd_card_file_add(hw->card, file);
145 file->private_data = hw;
149 hw->ops.release(hw, file);
154 module_put(hw->card->module);
158 static int snd_hwdep_release(struct inode *inode, struct file * file)
161 snd_hwdep_t *hw = file->private_data;
162 down(&hw->open_mutex);
163 if (hw->ops.release) {
164 err = hw->ops.release(hw, file);
165 wake_up(&hw->open_wait);
169 snd_card_file_remove(hw->card, file);
171 module_put(hw->card->module);
175 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
177 snd_hwdep_t *hw = file->private_data;
179 return hw->ops.poll(hw, file, wait);
183 static int snd_hwdep_info(snd_hwdep_t *hw, snd_hwdep_info_t __user *_info)
185 snd_hwdep_info_t info;
187 memset(&info, 0, sizeof(info));
188 info.card = hw->card->number;
189 strlcpy(info.id, hw->id, sizeof(info.id));
190 strlcpy(info.name, hw->name, sizeof(info.name));
191 info.iface = hw->iface;
192 if (copy_to_user(_info, &info, sizeof(info)))
197 static int snd_hwdep_dsp_status(snd_hwdep_t *hw, snd_hwdep_dsp_status_t __user *_info)
199 snd_hwdep_dsp_status_t 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(snd_hwdep_t *hw, snd_hwdep_dsp_image_t __user *_info)
215 snd_hwdep_dsp_image_t info;
218 if (! hw->ops.dsp_load)
220 memset(&info, 0, sizeof(info));
221 if (copy_from_user(&info, _info, sizeof(info)))
223 /* check whether the dsp was already loaded */
224 if (hw->dsp_loaded & (1 << info.index))
226 if (verify_area(VERIFY_READ, info.image, info.length))
228 err = hw->ops.dsp_load(hw, &info);
231 hw->dsp_loaded |= (1 << info.index);
235 static inline int _snd_hwdep_ioctl(struct inode *inode, struct file * file,
236 unsigned int cmd, unsigned long arg)
238 snd_hwdep_t *hw = file->private_data;
239 void __user *argp = (void __user *)arg;
241 case SNDRV_HWDEP_IOCTL_PVERSION:
242 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
243 case SNDRV_HWDEP_IOCTL_INFO:
244 return snd_hwdep_info(hw, argp);
245 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
246 return snd_hwdep_dsp_status(hw, argp);
247 case SNDRV_HWDEP_IOCTL_DSP_LOAD:
248 return snd_hwdep_dsp_load(hw, argp);
251 return hw->ops.ioctl(hw, file, cmd, arg);
255 /* FIXME: need to unlock BKL to allow preemption */
256 static int snd_hwdep_ioctl(struct inode *inode, struct file * file,
257 unsigned int cmd, unsigned long arg)
261 err = _snd_hwdep_ioctl(inode, file, cmd, arg);
266 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
268 snd_hwdep_t *hw = file->private_data;
270 return hw->ops.mmap(hw, file, vma);
274 static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control,
275 unsigned int cmd, unsigned long arg)
279 tmp = card->number * SNDRV_MINOR_HWDEPS;
281 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
285 if (get_user(device, (int __user *)arg))
287 device = device < 0 ? 0 : device + 1;
288 while (device < SNDRV_MINOR_HWDEPS) {
289 if (snd_hwdep_devices[tmp + device])
293 if (device >= SNDRV_MINOR_HWDEPS)
295 if (put_user(device, (int __user *)arg))
299 case SNDRV_CTL_IOCTL_HWDEP_INFO:
301 snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg;
305 if (get_user(device, &info->device))
307 if (device < 0 || device >= SNDRV_MINOR_HWDEPS)
309 hwdep = snd_hwdep_devices[tmp + device];
312 return snd_hwdep_info(hwdep, info);
322 static struct file_operations snd_hwdep_f_ops =
324 .owner = THIS_MODULE,
325 .llseek = snd_hwdep_llseek,
326 .read = snd_hwdep_read,
327 .write = snd_hwdep_write,
328 .open = snd_hwdep_open,
329 .release = snd_hwdep_release,
330 .poll = snd_hwdep_poll,
331 .ioctl = snd_hwdep_ioctl,
332 .mmap = snd_hwdep_mmap,
335 static snd_minor_t snd_hwdep_reg =
337 .comment = "hardware dependent",
338 .f_ops = &snd_hwdep_f_ops,
342 * snd_hwdep_new - create a new hwdep instance
343 * @card: the card instance
345 * @device: the device index (zero-based)
346 * @rhwdep: the pointer to store the new hwdep instance
348 * Creates a new hwdep instance with the given index on the card.
349 * The callbacks (hwdep->ops) must be set on the returned instance
350 * after this call manually by the caller.
352 * Returns zero if successful, or a negative error code on failure.
354 int snd_hwdep_new(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep)
358 static snd_device_ops_t ops = {
359 .dev_free = snd_hwdep_dev_free,
360 .dev_register = snd_hwdep_dev_register,
361 .dev_unregister = snd_hwdep_dev_unregister
364 snd_assert(rhwdep != NULL, return -EINVAL);
366 snd_assert(card != NULL, return -ENXIO);
367 hwdep = kcalloc(1, sizeof(*hwdep), GFP_KERNEL);
371 hwdep->device = device;
373 strlcpy(hwdep->id, id, sizeof(hwdep->id));
375 #ifdef CONFIG_SND_OSSEMUL
376 hwdep->oss_type = -1;
378 if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
379 snd_hwdep_free(hwdep);
382 init_waitqueue_head(&hwdep->open_wait);
383 init_MUTEX(&hwdep->open_mutex);
388 static int snd_hwdep_free(snd_hwdep_t *hwdep)
390 snd_assert(hwdep != NULL, return -ENXIO);
391 if (hwdep->private_free)
392 hwdep->private_free(hwdep);
397 static int snd_hwdep_dev_free(snd_device_t *device)
399 snd_hwdep_t *hwdep = device->device_data;
400 return snd_hwdep_free(hwdep);
403 static int snd_hwdep_dev_register(snd_device_t *device)
405 snd_hwdep_t *hwdep = device->device_data;
409 down(®ister_mutex);
410 idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
411 if (snd_hwdep_devices[idx]) {
415 snd_hwdep_devices[idx] = hwdep;
416 sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
417 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
418 hwdep->card, hwdep->device,
419 &snd_hwdep_reg, name)) < 0) {
420 snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
421 hwdep->card->number, hwdep->device);
422 snd_hwdep_devices[idx] = NULL;
426 #ifdef CONFIG_SND_OSSEMUL
428 if (hwdep->oss_type >= 0) {
429 if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
430 snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
432 if (snd_register_oss_device(hwdep->oss_type,
433 hwdep->card, hwdep->device,
434 &snd_hwdep_reg, hwdep->oss_dev) < 0) {
435 snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
436 hwdep->card->number, hwdep->device);
446 static int snd_hwdep_dev_unregister(snd_device_t *device)
448 snd_hwdep_t *hwdep = device->device_data;
451 snd_assert(hwdep != NULL, return -ENXIO);
452 down(®ister_mutex);
453 idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
454 if (snd_hwdep_devices[idx] != hwdep) {
458 #ifdef CONFIG_SND_OSSEMUL
460 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
462 snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
463 snd_hwdep_devices[idx] = NULL;
465 return snd_hwdep_free(hwdep);
472 static void snd_hwdep_proc_read(snd_info_entry_t *entry,
473 snd_info_buffer_t * buffer)
478 down(®ister_mutex);
479 for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) {
480 hwdep = snd_hwdep_devices[idx];
483 snd_iprintf(buffer, "%02i-%02i: %s\n",
484 idx / SNDRV_MINOR_HWDEPS,
485 idx % SNDRV_MINOR_HWDEPS,
495 static snd_info_entry_t *snd_hwdep_proc_entry = NULL;
497 static int __init alsa_hwdep_init(void)
499 snd_info_entry_t *entry;
501 memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices));
502 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
503 entry->c.text.read_size = 512;
504 entry->c.text.read = snd_hwdep_proc_read;
505 if (snd_info_register(entry) < 0) {
506 snd_info_free_entry(entry);
510 snd_hwdep_proc_entry = entry;
511 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
515 static void __exit alsa_hwdep_exit(void)
517 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
518 if (snd_hwdep_proc_entry) {
519 snd_info_unregister(snd_hwdep_proc_entry);
520 snd_hwdep_proc_entry = NULL;
524 module_init(alsa_hwdep_init)
525 module_exit(alsa_hwdep_exit)
527 EXPORT_SYMBOL(snd_hwdep_new);