fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / sound / core / hwdep.c
blobbfd9d182b8a33ac3c85ec3067c51ee4642404d30
1 /*
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 <sound/driver.h>
23 #include <linux/major.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/mutex.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)
53 return hwdep;
54 return NULL;
57 static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
59 struct snd_hwdep *hw = file->private_data;
60 if (hw->ops.llseek)
61 return hw->ops.llseek(hw, file, offset, orig);
62 return -ENXIO;
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;
69 if (hw->ops.read)
70 return hw->ops.read(hw, buf, count, offset);
71 return -ENXIO;
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;
78 if (hw->ops.write)
79 return hw->ops.write(hw, buf, count, offset);
80 return -ENXIO;
83 static int snd_hwdep_open(struct inode *inode, struct file * file)
85 int major = imajor(inode);
86 struct snd_hwdep *hw;
87 int err;
88 wait_queue_t wait;
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);
97 #endif
98 } else
99 return -ENXIO;
100 if (hw == NULL)
101 return -ENODEV;
103 if (!hw->ops.open)
104 return -ENXIO;
106 if (!try_module_get(hw->card->module))
107 return -EFAULT;
109 init_waitqueue_entry(&wait, current);
110 add_wait_queue(&hw->open_wait, &wait);
111 mutex_lock(&hw->open_mutex);
112 while (1) {
113 if (hw->exclusive && hw->used > 0) {
114 err = -EBUSY;
115 break;
117 err = hw->ops.open(hw, file);
118 if (err >= 0)
119 break;
120 if (err == -EAGAIN) {
121 if (file->f_flags & O_NONBLOCK) {
122 err = -EBUSY;
123 break;
125 } else
126 break;
127 set_current_state(TASK_INTERRUPTIBLE);
128 mutex_unlock(&hw->open_mutex);
129 schedule();
130 mutex_lock(&hw->open_mutex);
131 if (signal_pending(current)) {
132 err = -ERESTARTSYS;
133 break;
136 remove_wait_queue(&hw->open_wait, &wait);
137 if (err >= 0) {
138 err = snd_card_file_add(hw->card, file);
139 if (err >= 0) {
140 file->private_data = hw;
141 hw->used++;
142 } else {
143 if (hw->ops.release)
144 hw->ops.release(hw, file);
147 mutex_unlock(&hw->open_mutex);
148 if (err < 0)
149 module_put(hw->card->module);
150 return err;
153 static int snd_hwdep_release(struct inode *inode, struct file * file)
155 int err = -ENXIO;
156 struct snd_hwdep *hw = file->private_data;
157 struct module *mod = hw->card->module;
159 mutex_lock(&hw->open_mutex);
160 if (hw->ops.release)
161 err = hw->ops.release(hw, file);
162 if (hw->used > 0)
163 hw->used--;
164 mutex_unlock(&hw->open_mutex);
165 wake_up(&hw->open_wait);
167 snd_card_file_remove(hw->card, file);
168 module_put(mod);
169 return err;
172 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
174 struct snd_hwdep *hw = file->private_data;
175 if (hw->ops.poll)
176 return hw->ops.poll(hw, file, wait);
177 return 0;
180 static int snd_hwdep_info(struct snd_hwdep *hw,
181 struct snd_hwdep_info __user *_info)
183 struct snd_hwdep_info info;
185 memset(&info, 0, sizeof(info));
186 info.card = hw->card->number;
187 strlcpy(info.id, hw->id, sizeof(info.id));
188 strlcpy(info.name, hw->name, sizeof(info.name));
189 info.iface = hw->iface;
190 if (copy_to_user(_info, &info, sizeof(info)))
191 return -EFAULT;
192 return 0;
195 static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
196 struct snd_hwdep_dsp_status __user *_info)
198 struct snd_hwdep_dsp_status info;
199 int err;
201 if (! hw->ops.dsp_status)
202 return -ENXIO;
203 memset(&info, 0, sizeof(info));
204 info.dsp_loaded = hw->dsp_loaded;
205 if ((err = hw->ops.dsp_status(hw, &info)) < 0)
206 return err;
207 if (copy_to_user(_info, &info, sizeof(info)))
208 return -EFAULT;
209 return 0;
212 static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
213 struct snd_hwdep_dsp_image __user *_info)
215 struct snd_hwdep_dsp_image info;
216 int err;
218 if (! hw->ops.dsp_load)
219 return -ENXIO;
220 memset(&info, 0, sizeof(info));
221 if (copy_from_user(&info, _info, sizeof(info)))
222 return -EFAULT;
223 /* check whether the dsp was already loaded */
224 if (hw->dsp_loaded & (1 << info.index))
225 return -EBUSY;
226 if (!access_ok(VERIFY_READ, info.image, info.length))
227 return -EFAULT;
228 err = hw->ops.dsp_load(hw, &info);
229 if (err < 0)
230 return err;
231 hw->dsp_loaded |= (1 << info.index);
232 return 0;
235 static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
236 unsigned long arg)
238 struct snd_hwdep *hw = file->private_data;
239 void __user *argp = (void __user *)arg;
240 switch (cmd) {
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);
250 if (hw->ops.ioctl)
251 return hw->ops.ioctl(hw, file, cmd, arg);
252 return -ENOTTY;
255 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
257 struct snd_hwdep *hw = file->private_data;
258 if (hw->ops.mmap)
259 return hw->ops.mmap(hw, file, vma);
260 return -ENXIO;
263 static int snd_hwdep_control_ioctl(struct snd_card *card,
264 struct snd_ctl_file * control,
265 unsigned int cmd, unsigned long arg)
267 switch (cmd) {
268 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
270 int device;
272 if (get_user(device, (int __user *)arg))
273 return -EFAULT;
274 mutex_lock(&register_mutex);
275 device = device < 0 ? 0 : device + 1;
276 while (device < SNDRV_MINOR_HWDEPS) {
277 if (snd_hwdep_search(card, device))
278 break;
279 device++;
281 if (device >= SNDRV_MINOR_HWDEPS)
282 device = -1;
283 mutex_unlock(&register_mutex);
284 if (put_user(device, (int __user *)arg))
285 return -EFAULT;
286 return 0;
288 case SNDRV_CTL_IOCTL_HWDEP_INFO:
290 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
291 int device, err;
292 struct snd_hwdep *hwdep;
294 if (get_user(device, &info->device))
295 return -EFAULT;
296 mutex_lock(&register_mutex);
297 hwdep = snd_hwdep_search(card, device);
298 if (hwdep)
299 err = snd_hwdep_info(hwdep, info);
300 else
301 err = -ENXIO;
302 mutex_unlock(&register_mutex);
303 return err;
306 return -ENOIOCTLCMD;
309 #ifdef CONFIG_COMPAT
310 #include "hwdep_compat.c"
311 #else
312 #define snd_hwdep_ioctl_compat NULL
313 #endif
319 static const struct file_operations snd_hwdep_f_ops =
321 .owner = THIS_MODULE,
322 .llseek = snd_hwdep_llseek,
323 .read = snd_hwdep_read,
324 .write = snd_hwdep_write,
325 .open = snd_hwdep_open,
326 .release = snd_hwdep_release,
327 .poll = snd_hwdep_poll,
328 .unlocked_ioctl = snd_hwdep_ioctl,
329 .compat_ioctl = snd_hwdep_ioctl_compat,
330 .mmap = snd_hwdep_mmap,
334 * snd_hwdep_new - create a new hwdep instance
335 * @card: the card instance
336 * @id: the id string
337 * @device: the device index (zero-based)
338 * @rhwdep: the pointer to store the new hwdep instance
340 * Creates a new hwdep instance with the given index on the card.
341 * The callbacks (hwdep->ops) must be set on the returned instance
342 * after this call manually by the caller.
344 * Returns zero if successful, or a negative error code on failure.
346 int snd_hwdep_new(struct snd_card *card, char *id, int device,
347 struct snd_hwdep **rhwdep)
349 struct snd_hwdep *hwdep;
350 int err;
351 static struct snd_device_ops ops = {
352 .dev_free = snd_hwdep_dev_free,
353 .dev_register = snd_hwdep_dev_register,
354 .dev_disconnect = snd_hwdep_dev_disconnect,
357 snd_assert(rhwdep != NULL, return -EINVAL);
358 *rhwdep = NULL;
359 snd_assert(card != NULL, return -ENXIO);
360 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
361 if (hwdep == NULL) {
362 snd_printk(KERN_ERR "hwdep: cannot allocate\n");
363 return -ENOMEM;
365 hwdep->card = card;
366 hwdep->device = device;
367 if (id)
368 strlcpy(hwdep->id, id, sizeof(hwdep->id));
369 #ifdef CONFIG_SND_OSSEMUL
370 hwdep->oss_type = -1;
371 #endif
372 if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
373 snd_hwdep_free(hwdep);
374 return err;
376 init_waitqueue_head(&hwdep->open_wait);
377 mutex_init(&hwdep->open_mutex);
378 *rhwdep = hwdep;
379 return 0;
382 static int snd_hwdep_free(struct snd_hwdep *hwdep)
384 snd_assert(hwdep != NULL, return -ENXIO);
385 if (hwdep->private_free)
386 hwdep->private_free(hwdep);
387 kfree(hwdep);
388 return 0;
391 static int snd_hwdep_dev_free(struct snd_device *device)
393 struct snd_hwdep *hwdep = device->device_data;
394 return snd_hwdep_free(hwdep);
397 static int snd_hwdep_dev_register(struct snd_device *device)
399 struct snd_hwdep *hwdep = device->device_data;
400 int err;
401 char name[32];
403 mutex_lock(&register_mutex);
404 if (snd_hwdep_search(hwdep->card, hwdep->device)) {
405 mutex_unlock(&register_mutex);
406 return -EBUSY;
408 list_add_tail(&hwdep->list, &snd_hwdep_devices);
409 sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
410 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
411 hwdep->card, hwdep->device,
412 &snd_hwdep_f_ops, hwdep, name)) < 0) {
413 snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
414 hwdep->card->number, hwdep->device);
415 list_del(&hwdep->list);
416 mutex_unlock(&register_mutex);
417 return err;
419 #ifdef CONFIG_SND_OSSEMUL
420 hwdep->ossreg = 0;
421 if (hwdep->oss_type >= 0) {
422 if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
423 snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
424 } else {
425 if (snd_register_oss_device(hwdep->oss_type,
426 hwdep->card, hwdep->device,
427 &snd_hwdep_f_ops, hwdep,
428 hwdep->oss_dev) < 0) {
429 snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
430 hwdep->card->number, hwdep->device);
431 } else
432 hwdep->ossreg = 1;
435 #endif
436 mutex_unlock(&register_mutex);
437 return 0;
440 static int snd_hwdep_dev_disconnect(struct snd_device *device)
442 struct snd_hwdep *hwdep = device->device_data;
444 snd_assert(hwdep != NULL, return -ENXIO);
445 mutex_lock(&register_mutex);
446 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
447 mutex_unlock(&register_mutex);
448 return -EINVAL;
450 #ifdef CONFIG_SND_OSSEMUL
451 if (hwdep->ossreg)
452 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
453 #endif
454 snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
455 list_del_init(&hwdep->list);
456 mutex_unlock(&register_mutex);
457 return 0;
460 #ifdef CONFIG_PROC_FS
462 * Info interface
465 static void snd_hwdep_proc_read(struct snd_info_entry *entry,
466 struct snd_info_buffer *buffer)
468 struct snd_hwdep *hwdep;
470 mutex_lock(&register_mutex);
471 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
472 snd_iprintf(buffer, "%02i-%02i: %s\n",
473 hwdep->card->number, hwdep->device, hwdep->name);
474 mutex_unlock(&register_mutex);
477 static struct snd_info_entry *snd_hwdep_proc_entry;
479 static void __init snd_hwdep_proc_init(void)
481 struct snd_info_entry *entry;
483 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
484 entry->c.text.read = snd_hwdep_proc_read;
485 if (snd_info_register(entry) < 0) {
486 snd_info_free_entry(entry);
487 entry = NULL;
490 snd_hwdep_proc_entry = entry;
493 static void __exit snd_hwdep_proc_done(void)
495 snd_info_free_entry(snd_hwdep_proc_entry);
497 #else /* !CONFIG_PROC_FS */
498 #define snd_hwdep_proc_init()
499 #define snd_hwdep_proc_done()
500 #endif /* CONFIG_PROC_FS */
504 * ENTRY functions
507 static int __init alsa_hwdep_init(void)
509 snd_hwdep_proc_init();
510 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
511 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
512 return 0;
515 static void __exit alsa_hwdep_exit(void)
517 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
518 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
519 snd_hwdep_proc_done();
522 module_init(alsa_hwdep_init)
523 module_exit(alsa_hwdep_exit)
525 EXPORT_SYMBOL(snd_hwdep_new);