75ea16f35b1aa1e1db985802e923c86e28f69af3
[pandora-kernel.git] / sound / core / hwdep.c
1 /*
2  *  Hardware dependent layer
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <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>
33
34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
35 MODULE_DESCRIPTION("Hardware dependent layer");
36 MODULE_LICENSE("GPL");
37
38 static LIST_HEAD(snd_hwdep_devices);
39 static DEFINE_MUTEX(register_mutex);
40
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);
45
46
47 static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
48 {
49         struct snd_hwdep *hwdep;
50
51         list_for_each_entry(hwdep, &snd_hwdep_devices, list)
52                 if (hwdep->card == card && hwdep->device == device)
53                         return hwdep;
54         return NULL;
55 }
56
57 static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
58 {
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;
63 }
64
65 static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
66                               size_t count, loff_t *offset)
67 {
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;  
72 }
73
74 static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
75                                size_t count, loff_t *offset)
76 {
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;  
81 }
82
83 static int snd_hwdep_open(struct inode *inode, struct file * file)
84 {
85         int major = imajor(inode);
86         struct snd_hwdep *hw;
87         int err;
88         wait_queue_t wait;
89
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;
102
103         if (!try_module_get(hw->card->module))
104                 return -EFAULT;
105
106         init_waitqueue_entry(&wait, current);
107         add_wait_queue(&hw->open_wait, &wait);
108         mutex_lock(&hw->open_mutex);
109         while (1) {
110                 if (hw->exclusive && hw->used > 0) {
111                         err = -EBUSY;
112                         break;
113                 }
114                 if (!hw->ops.open) {
115                         err = 0;
116                         break;
117                 }
118                 err = hw->ops.open(hw, file);
119                 if (err >= 0)
120                         break;
121                 if (err == -EAGAIN) {
122                         if (file->f_flags & O_NONBLOCK) {
123                                 err = -EBUSY;
124                                 break;
125                         }
126                 } else
127                         break;
128                 set_current_state(TASK_INTERRUPTIBLE);
129                 mutex_unlock(&hw->open_mutex);
130                 schedule();
131                 mutex_lock(&hw->open_mutex);
132                 if (signal_pending(current)) {
133                         err = -ERESTARTSYS;
134                         break;
135                 }
136         }
137         remove_wait_queue(&hw->open_wait, &wait);
138         if (err >= 0) {
139                 err = snd_card_file_add(hw->card, file);
140                 if (err >= 0) {
141                         file->private_data = hw;
142                         hw->used++;
143                 } else {
144                         if (hw->ops.release)
145                                 hw->ops.release(hw, file);
146                 }
147         }
148         mutex_unlock(&hw->open_mutex);
149         if (err < 0)
150                 module_put(hw->card->module);
151         return err;
152 }
153
154 static int snd_hwdep_release(struct inode *inode, struct file * file)
155 {
156         int err = 0;
157         struct snd_hwdep *hw = file->private_data;
158         struct module *mod = hw->card->module;
159
160         mutex_lock(&hw->open_mutex);
161         if (hw->ops.release)
162                 err = hw->ops.release(hw, file);
163         if (hw->used > 0)
164                 hw->used--;
165         mutex_unlock(&hw->open_mutex);
166         wake_up(&hw->open_wait);
167
168         snd_card_file_remove(hw->card, file);
169         module_put(mod);
170         return err;
171 }
172
173 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
174 {
175         struct snd_hwdep *hw = file->private_data;
176         if (hw->ops.poll)
177                 return hw->ops.poll(hw, file, wait);
178         return 0;
179 }
180
181 static int snd_hwdep_info(struct snd_hwdep *hw,
182                           struct snd_hwdep_info __user *_info)
183 {
184         struct snd_hwdep_info info;
185         
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)))
192                 return -EFAULT;
193         return 0;
194 }
195
196 static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
197                                 struct snd_hwdep_dsp_status __user *_info)
198 {
199         struct snd_hwdep_dsp_status info;
200         int err;
201         
202         if (! hw->ops.dsp_status)
203                 return -ENXIO;
204         memset(&info, 0, sizeof(info));
205         info.dsp_loaded = hw->dsp_loaded;
206         if ((err = hw->ops.dsp_status(hw, &info)) < 0)
207                 return err;
208         if (copy_to_user(_info, &info, sizeof(info)))
209                 return -EFAULT;
210         return 0;
211 }
212
213 static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
214                               struct snd_hwdep_dsp_image __user *_info)
215 {
216         struct snd_hwdep_dsp_image info;
217         int err;
218         
219         if (! hw->ops.dsp_load)
220                 return -ENXIO;
221         memset(&info, 0, sizeof(info));
222         if (copy_from_user(&info, _info, sizeof(info)))
223                 return -EFAULT;
224         /* check whether the dsp was already loaded */
225         if (hw->dsp_loaded & (1 << info.index))
226                 return -EBUSY;
227         if (!access_ok(VERIFY_READ, info.image, info.length))
228                 return -EFAULT;
229         err = hw->ops.dsp_load(hw, &info);
230         if (err < 0)
231                 return err;
232         hw->dsp_loaded |= (1 << info.index);
233         return 0;
234 }
235
236 static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
237                             unsigned long arg)
238 {
239         struct snd_hwdep *hw = file->private_data;
240         void __user *argp = (void __user *)arg;
241         switch (cmd) {
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);
250         }
251         if (hw->ops.ioctl)
252                 return hw->ops.ioctl(hw, file, cmd, arg);
253         return -ENOTTY;
254 }
255
256 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
257 {
258         struct snd_hwdep *hw = file->private_data;
259         if (hw->ops.mmap)
260                 return hw->ops.mmap(hw, file, vma);
261         return -ENXIO;
262 }
263
264 static int snd_hwdep_control_ioctl(struct snd_card *card,
265                                    struct snd_ctl_file * control,
266                                    unsigned int cmd, unsigned long arg)
267 {
268         switch (cmd) {
269         case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
270                 {
271                         int device;
272
273                         if (get_user(device, (int __user *)arg))
274                                 return -EFAULT;
275                         mutex_lock(&register_mutex);
276
277                         if (device < 0)
278                                 device = 0;
279                         else if (device < SNDRV_MINOR_HWDEPS)
280                                 device++;
281                         else
282                                 device = SNDRV_MINOR_HWDEPS;
283
284                         while (device < SNDRV_MINOR_HWDEPS) {
285                                 if (snd_hwdep_search(card, device))
286                                         break;
287                                 device++;
288                         }
289                         if (device >= SNDRV_MINOR_HWDEPS)
290                                 device = -1;
291                         mutex_unlock(&register_mutex);
292                         if (put_user(device, (int __user *)arg))
293                                 return -EFAULT;
294                         return 0;
295                 }
296         case SNDRV_CTL_IOCTL_HWDEP_INFO:
297                 {
298                         struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
299                         int device, err;
300                         struct snd_hwdep *hwdep;
301
302                         if (get_user(device, &info->device))
303                                 return -EFAULT;
304                         mutex_lock(&register_mutex);
305                         hwdep = snd_hwdep_search(card, device);
306                         if (hwdep)
307                                 err = snd_hwdep_info(hwdep, info);
308                         else
309                                 err = -ENXIO;
310                         mutex_unlock(&register_mutex);
311                         return err;
312                 }
313         }
314         return -ENOIOCTLCMD;
315 }
316
317 #ifdef CONFIG_COMPAT
318 #include "hwdep_compat.c"
319 #else
320 #define snd_hwdep_ioctl_compat  NULL
321 #endif
322
323 /*
324
325  */
326
327 static const struct file_operations snd_hwdep_f_ops =
328 {
329         .owner =        THIS_MODULE,
330         .llseek =       snd_hwdep_llseek,
331         .read =         snd_hwdep_read,
332         .write =        snd_hwdep_write,
333         .open =         snd_hwdep_open,
334         .release =      snd_hwdep_release,
335         .poll =         snd_hwdep_poll,
336         .unlocked_ioctl =       snd_hwdep_ioctl,
337         .compat_ioctl = snd_hwdep_ioctl_compat,
338         .mmap =         snd_hwdep_mmap,
339 };
340
341 /**
342  * snd_hwdep_new - create a new hwdep instance
343  * @card: the card instance
344  * @id: the id string
345  * @device: the device index (zero-based)
346  * @rhwdep: the pointer to store the new hwdep instance
347  *
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.
351  *
352  * Returns zero if successful, or a negative error code on failure.
353  */
354 int snd_hwdep_new(struct snd_card *card, char *id, int device,
355                   struct snd_hwdep **rhwdep)
356 {
357         struct snd_hwdep *hwdep;
358         int err;
359         static struct snd_device_ops ops = {
360                 .dev_free = snd_hwdep_dev_free,
361                 .dev_register = snd_hwdep_dev_register,
362                 .dev_disconnect = snd_hwdep_dev_disconnect,
363         };
364
365         if (snd_BUG_ON(!card))
366                 return -ENXIO;
367         if (rhwdep)
368                 *rhwdep = NULL;
369         hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
370         if (hwdep == NULL) {
371                 snd_printk(KERN_ERR "hwdep: cannot allocate\n");
372                 return -ENOMEM;
373         }
374         hwdep->card = card;
375         hwdep->device = device;
376         if (id)
377                 strlcpy(hwdep->id, id, sizeof(hwdep->id));
378 #ifdef CONFIG_SND_OSSEMUL
379         hwdep->oss_type = -1;
380 #endif
381         if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
382                 snd_hwdep_free(hwdep);
383                 return err;
384         }
385         init_waitqueue_head(&hwdep->open_wait);
386         mutex_init(&hwdep->open_mutex);
387         if (rhwdep)
388                 *rhwdep = hwdep;
389         return 0;
390 }
391
392 static int snd_hwdep_free(struct snd_hwdep *hwdep)
393 {
394         if (!hwdep)
395                 return 0;
396         if (hwdep->private_free)
397                 hwdep->private_free(hwdep);
398         kfree(hwdep);
399         return 0;
400 }
401
402 static int snd_hwdep_dev_free(struct snd_device *device)
403 {
404         struct snd_hwdep *hwdep = device->device_data;
405         return snd_hwdep_free(hwdep);
406 }
407
408 static int snd_hwdep_dev_register(struct snd_device *device)
409 {
410         struct snd_hwdep *hwdep = device->device_data;
411         int err;
412         char name[32];
413
414         mutex_lock(&register_mutex);
415         if (snd_hwdep_search(hwdep->card, hwdep->device)) {
416                 mutex_unlock(&register_mutex);
417                 return -EBUSY;
418         }
419         list_add_tail(&hwdep->list, &snd_hwdep_devices);
420         sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
421         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
422                                        hwdep->card, hwdep->device,
423                                        &snd_hwdep_f_ops, hwdep, name)) < 0) {
424                 snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
425                            hwdep->card->number, hwdep->device);
426                 list_del(&hwdep->list);
427                 mutex_unlock(&register_mutex);
428                 return err;
429         }
430 #ifdef CONFIG_SND_OSSEMUL
431         hwdep->ossreg = 0;
432         if (hwdep->oss_type >= 0) {
433                 if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
434                         snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
435                 } else {
436                         if (snd_register_oss_device(hwdep->oss_type,
437                                                     hwdep->card, hwdep->device,
438                                                     &snd_hwdep_f_ops, hwdep,
439                                                     hwdep->oss_dev) < 0) {
440                                 snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
441                                            hwdep->card->number, hwdep->device);
442                         } else
443                                 hwdep->ossreg = 1;
444                 }
445         }
446 #endif
447         mutex_unlock(&register_mutex);
448         return 0;
449 }
450
451 static int snd_hwdep_dev_disconnect(struct snd_device *device)
452 {
453         struct snd_hwdep *hwdep = device->device_data;
454
455         if (snd_BUG_ON(!hwdep))
456                 return -ENXIO;
457         mutex_lock(&register_mutex);
458         if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
459                 mutex_unlock(&register_mutex);
460                 return -EINVAL;
461         }
462 #ifdef CONFIG_SND_OSSEMUL
463         if (hwdep->ossreg)
464                 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
465 #endif
466         snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
467         list_del_init(&hwdep->list);
468         mutex_unlock(&register_mutex);
469         return 0;
470 }
471
472 #ifdef CONFIG_PROC_FS
473 /*
474  *  Info interface
475  */
476
477 static void snd_hwdep_proc_read(struct snd_info_entry *entry,
478                                 struct snd_info_buffer *buffer)
479 {
480         struct snd_hwdep *hwdep;
481
482         mutex_lock(&register_mutex);
483         list_for_each_entry(hwdep, &snd_hwdep_devices, list)
484                 snd_iprintf(buffer, "%02i-%02i: %s\n",
485                             hwdep->card->number, hwdep->device, hwdep->name);
486         mutex_unlock(&register_mutex);
487 }
488
489 static struct snd_info_entry *snd_hwdep_proc_entry;
490
491 static void __init snd_hwdep_proc_init(void)
492 {
493         struct snd_info_entry *entry;
494
495         if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
496                 entry->c.text.read = snd_hwdep_proc_read;
497                 if (snd_info_register(entry) < 0) {
498                         snd_info_free_entry(entry);
499                         entry = NULL;
500                 }
501         }
502         snd_hwdep_proc_entry = entry;
503 }
504
505 static void __exit snd_hwdep_proc_done(void)
506 {
507         snd_info_free_entry(snd_hwdep_proc_entry);
508 }
509 #else /* !CONFIG_PROC_FS */
510 #define snd_hwdep_proc_init()
511 #define snd_hwdep_proc_done()
512 #endif /* CONFIG_PROC_FS */
513
514
515 /*
516  *  ENTRY functions
517  */
518
519 static int __init alsa_hwdep_init(void)
520 {
521         snd_hwdep_proc_init();
522         snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
523         snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
524         return 0;
525 }
526
527 static void __exit alsa_hwdep_exit(void)
528 {
529         snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
530         snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
531         snd_hwdep_proc_done();
532 }
533
534 module_init(alsa_hwdep_init)
535 module_exit(alsa_hwdep_exit)
536
537 EXPORT_SYMBOL(snd_hwdep_new);