~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/sound/core/hwdep.c

Version: ~ [ linux-5.3-rc4 ] ~ [ linux-5.2.8 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.66 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.138 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.71 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_dev_free(struct snd_device *device);
 42 static int snd_hwdep_dev_register(struct snd_device *device);
 43 static int snd_hwdep_dev_disconnect(struct snd_device *device);
 44 
 45 
 46 static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
 47 {
 48         struct snd_hwdep *hwdep;
 49 
 50         list_for_each_entry(hwdep, &snd_hwdep_devices, list)
 51                 if (hwdep->card == card && hwdep->device == device)
 52                         return hwdep;
 53         return NULL;
 54 }
 55 
 56 static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
 57 {
 58         struct snd_hwdep *hw = file->private_data;
 59         if (hw->ops.llseek)
 60                 return hw->ops.llseek(hw, file, offset, orig);
 61         return -ENXIO;
 62 }
 63 
 64 static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
 65                               size_t count, loff_t *offset)
 66 {
 67         struct snd_hwdep *hw = file->private_data;
 68         if (hw->ops.read)
 69                 return hw->ops.read(hw, buf, count, offset);
 70         return -ENXIO;  
 71 }
 72 
 73 static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
 74                                size_t count, loff_t *offset)
 75 {
 76         struct snd_hwdep *hw = file->private_data;
 77         if (hw->ops.write)
 78                 return hw->ops.write(hw, buf, count, offset);
 79         return -ENXIO;  
 80 }
 81 
 82 static int snd_hwdep_open(struct inode *inode, struct file * file)
 83 {
 84         int major = imajor(inode);
 85         struct snd_hwdep *hw;
 86         int err;
 87         wait_queue_t wait;
 88 
 89         if (major == snd_major) {
 90                 hw = snd_lookup_minor_data(iminor(inode),
 91                                            SNDRV_DEVICE_TYPE_HWDEP);
 92 #ifdef CONFIG_SND_OSSEMUL
 93         } else if (major == SOUND_MAJOR) {
 94                 hw = snd_lookup_oss_minor_data(iminor(inode),
 95                                                SNDRV_OSS_DEVICE_TYPE_DMFM);
 96 #endif
 97         } else
 98                 return -ENXIO;
 99         if (hw == NULL)
100                 return -ENODEV;
101 
102         if (!try_module_get(hw->card->module)) {
103                 snd_card_unref(hw->card);
104                 return -EFAULT;
105         }
106 
107         init_waitqueue_entry(&wait, current);
108         add_wait_queue(&hw->open_wait, &wait);
109         mutex_lock(&hw->open_mutex);
110         while (1) {
111                 if (hw->exclusive && hw->used > 0) {
112                         err = -EBUSY;
113                         break;
114                 }
115                 if (!hw->ops.open) {
116                         err = 0;
117                         break;
118                 }
119                 err = hw->ops.open(hw, file);
120                 if (err >= 0)
121                         break;
122                 if (err == -EAGAIN) {
123                         if (file->f_flags & O_NONBLOCK) {
124                                 err = -EBUSY;
125                                 break;
126                         }
127                 } else
128                         break;
129                 set_current_state(TASK_INTERRUPTIBLE);
130                 mutex_unlock(&hw->open_mutex);
131                 schedule();
132                 mutex_lock(&hw->open_mutex);
133                 if (hw->card->shutdown) {
134                         err = -ENODEV;
135                         break;
136                 }
137                 if (signal_pending(current)) {
138                         err = -ERESTARTSYS;
139                         break;
140                 }
141         }
142         remove_wait_queue(&hw->open_wait, &wait);
143         if (err >= 0) {
144                 err = snd_card_file_add(hw->card, file);
145                 if (err >= 0) {
146                         file->private_data = hw;
147                         hw->used++;
148                 } else {
149                         if (hw->ops.release)
150                                 hw->ops.release(hw, file);
151                 }
152         }
153         mutex_unlock(&hw->open_mutex);
154         if (err < 0)
155                 module_put(hw->card->module);
156         snd_card_unref(hw->card);
157         return err;
158 }
159 
160 static int snd_hwdep_release(struct inode *inode, struct file * file)
161 {
162         int err = 0;
163         struct snd_hwdep *hw = file->private_data;
164         struct module *mod = hw->card->module;
165 
166         mutex_lock(&hw->open_mutex);
167         if (hw->ops.release)
168                 err = hw->ops.release(hw, file);
169         if (hw->used > 0)
170                 hw->used--;
171         mutex_unlock(&hw->open_mutex);
172         wake_up(&hw->open_wait);
173 
174         snd_card_file_remove(hw->card, file);
175         module_put(mod);
176         return err;
177 }
178 
179 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
180 {
181         struct snd_hwdep *hw = file->private_data;
182         if (hw->ops.poll)
183                 return hw->ops.poll(hw, file, wait);
184         return 0;
185 }
186 
187 static int snd_hwdep_info(struct snd_hwdep *hw,
188                           struct snd_hwdep_info __user *_info)
189 {
190         struct snd_hwdep_info info;
191         
192         memset(&info, 0, sizeof(info));
193         info.card = hw->card->number;
194         strlcpy(info.id, hw->id, sizeof(info.id));      
195         strlcpy(info.name, hw->name, sizeof(info.name));
196         info.iface = hw->iface;
197         if (copy_to_user(_info, &info, sizeof(info)))
198                 return -EFAULT;
199         return 0;
200 }
201 
202 static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
203                                 struct snd_hwdep_dsp_status __user *_info)
204 {
205         struct snd_hwdep_dsp_status info;
206         int err;
207         
208         if (! hw->ops.dsp_status)
209                 return -ENXIO;
210         memset(&info, 0, sizeof(info));
211         info.dsp_loaded = hw->dsp_loaded;
212         if ((err = hw->ops.dsp_status(hw, &info)) < 0)
213                 return err;
214         if (copy_to_user(_info, &info, sizeof(info)))
215                 return -EFAULT;
216         return 0;
217 }
218 
219 static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
220                               struct snd_hwdep_dsp_image __user *_info)
221 {
222         struct snd_hwdep_dsp_image info;
223         int err;
224         
225         if (! hw->ops.dsp_load)
226                 return -ENXIO;
227         memset(&info, 0, sizeof(info));
228         if (copy_from_user(&info, _info, sizeof(info)))
229                 return -EFAULT;
230         /* check whether the dsp was already loaded */
231         if (hw->dsp_loaded & (1 << info.index))
232                 return -EBUSY;
233         if (!access_ok(VERIFY_READ, info.image, info.length))
234                 return -EFAULT;
235         err = hw->ops.dsp_load(hw, &info);
236         if (err < 0)
237                 return err;
238         hw->dsp_loaded |= (1 << info.index);
239         return 0;
240 }
241 
242 static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
243                             unsigned long arg)
244 {
245         struct snd_hwdep *hw = file->private_data;
246         void __user *argp = (void __user *)arg;
247         switch (cmd) {
248         case SNDRV_HWDEP_IOCTL_PVERSION:
249                 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
250         case SNDRV_HWDEP_IOCTL_INFO:
251                 return snd_hwdep_info(hw, argp);
252         case SNDRV_HWDEP_IOCTL_DSP_STATUS:
253                 return snd_hwdep_dsp_status(hw, argp);
254         case SNDRV_HWDEP_IOCTL_DSP_LOAD:
255                 return snd_hwdep_dsp_load(hw, argp);
256         }
257         if (hw->ops.ioctl)
258                 return hw->ops.ioctl(hw, file, cmd, arg);
259         return -ENOTTY;
260 }
261 
262 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
263 {
264         struct snd_hwdep *hw = file->private_data;
265         if (hw->ops.mmap)
266                 return hw->ops.mmap(hw, file, vma);
267         return -ENXIO;
268 }
269 
270 static int snd_hwdep_control_ioctl(struct snd_card *card,
271                                    struct snd_ctl_file * control,
272                                    unsigned int cmd, unsigned long arg)
273 {
274         switch (cmd) {
275         case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
276                 {
277                         int device;
278 
279                         if (get_user(device, (int __user *)arg))
280                                 return -EFAULT;
281                         mutex_lock(&register_mutex);
282 
283                         if (device < 0)
284                                 device = 0;
285                         else if (device < SNDRV_MINOR_HWDEPS)
286                                 device++;
287                         else
288                                 device = SNDRV_MINOR_HWDEPS;
289 
290                         while (device < SNDRV_MINOR_HWDEPS) {
291                                 if (snd_hwdep_search(card, device))
292                                         break;
293                                 device++;
294                         }
295                         if (device >= SNDRV_MINOR_HWDEPS)
296                                 device = -1;
297                         mutex_unlock(&register_mutex);
298                         if (put_user(device, (int __user *)arg))
299                                 return -EFAULT;
300                         return 0;
301                 }
302         case SNDRV_CTL_IOCTL_HWDEP_INFO:
303                 {
304                         struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
305                         int device, err;
306                         struct snd_hwdep *hwdep;
307 
308                         if (get_user(device, &info->device))
309                                 return -EFAULT;
310                         mutex_lock(&register_mutex);
311                         hwdep = snd_hwdep_search(card, device);
312                         if (hwdep)
313                                 err = snd_hwdep_info(hwdep, info);
314                         else
315                                 err = -ENXIO;
316                         mutex_unlock(&register_mutex);
317                         return err;
318                 }
319         }
320         return -ENOIOCTLCMD;
321 }
322 
323 #ifdef CONFIG_COMPAT
324 #include "hwdep_compat.c"
325 #else
326 #define snd_hwdep_ioctl_compat  NULL
327 #endif
328 
329 /*
330 
331  */
332 
333 static const struct file_operations snd_hwdep_f_ops =
334 {
335         .owner =        THIS_MODULE,
336         .llseek =       snd_hwdep_llseek,
337         .read =         snd_hwdep_read,
338         .write =        snd_hwdep_write,
339         .open =         snd_hwdep_open,
340         .release =      snd_hwdep_release,
341         .poll =         snd_hwdep_poll,
342         .unlocked_ioctl =       snd_hwdep_ioctl,
343         .compat_ioctl = snd_hwdep_ioctl_compat,
344         .mmap =         snd_hwdep_mmap,
345 };
346 
347 static void release_hwdep_device(struct device *dev)
348 {
349         kfree(container_of(dev, struct snd_hwdep, dev));
350 }
351 
352 /**
353  * snd_hwdep_new - create a new hwdep instance
354  * @card: the card instance
355  * @id: the id string
356  * @device: the device index (zero-based)
357  * @rhwdep: the pointer to store the new hwdep instance
358  *
359  * Creates a new hwdep instance with the given index on the card.
360  * The callbacks (hwdep->ops) must be set on the returned instance
361  * after this call manually by the caller.
362  *
363  * Return: Zero if successful, or a negative error code on failure.
364  */
365 int snd_hwdep_new(struct snd_card *card, char *id, int device,
366                   struct snd_hwdep **rhwdep)
367 {
368         struct snd_hwdep *hwdep;
369         int err;
370         static struct snd_device_ops ops = {
371                 .dev_free = snd_hwdep_dev_free,
372                 .dev_register = snd_hwdep_dev_register,
373                 .dev_disconnect = snd_hwdep_dev_disconnect,
374         };
375 
376         if (snd_BUG_ON(!card))
377                 return -ENXIO;
378         if (rhwdep)
379                 *rhwdep = NULL;
380         hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
381         if (!hwdep)
382                 return -ENOMEM;
383 
384         init_waitqueue_head(&hwdep->open_wait);
385         mutex_init(&hwdep->open_mutex);
386         hwdep->card = card;
387         hwdep->device = device;
388         if (id)
389                 strlcpy(hwdep->id, id, sizeof(hwdep->id));
390 
391         snd_device_initialize(&hwdep->dev, card);
392         hwdep->dev.release = release_hwdep_device;
393         dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
394 #ifdef CONFIG_SND_OSSEMUL
395         hwdep->oss_type = -1;
396 #endif
397 
398         err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
399         if (err < 0) {
400                 put_device(&hwdep->dev);
401                 return err;
402         }
403 
404         if (rhwdep)
405                 *rhwdep = hwdep;
406         return 0;
407 }
408 EXPORT_SYMBOL(snd_hwdep_new);
409 
410 static int snd_hwdep_dev_free(struct snd_device *device)
411 {
412         struct snd_hwdep *hwdep = device->device_data;
413         if (!hwdep)
414                 return 0;
415         if (hwdep->private_free)
416                 hwdep->private_free(hwdep);
417         put_device(&hwdep->dev);
418         return 0;
419 }
420 
421 static int snd_hwdep_dev_register(struct snd_device *device)
422 {
423         struct snd_hwdep *hwdep = device->device_data;
424         struct snd_card *card = hwdep->card;
425         int err;
426 
427         mutex_lock(&register_mutex);
428         if (snd_hwdep_search(card, hwdep->device)) {
429                 mutex_unlock(&register_mutex);
430                 return -EBUSY;
431         }
432         list_add_tail(&hwdep->list, &snd_hwdep_devices);
433         err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
434                                   hwdep->card, hwdep->device,
435                                   &snd_hwdep_f_ops, hwdep, &hwdep->dev);
436         if (err < 0) {
437                 dev_err(&hwdep->dev, "unable to register\n");
438                 list_del(&hwdep->list);
439                 mutex_unlock(&register_mutex);
440                 return err;
441         }
442 
443 #ifdef CONFIG_SND_OSSEMUL
444         hwdep->ossreg = 0;
445         if (hwdep->oss_type >= 0) {
446                 if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
447                     hwdep->device)
448                         dev_warn(&hwdep->dev,
449                                  "only hwdep device 0 can be registered as OSS direct FM device!\n");
450                 else if (snd_register_oss_device(hwdep->oss_type,
451                                                  card, hwdep->device,
452                                                  &snd_hwdep_f_ops, hwdep) < 0)
453                         dev_warn(&hwdep->dev,
454                                  "unable to register OSS compatibility device\n");
455                 else
456                         hwdep->ossreg = 1;
457         }
458 #endif
459         mutex_unlock(&register_mutex);
460         return 0;
461 }
462 
463 static int snd_hwdep_dev_disconnect(struct snd_device *device)
464 {
465         struct snd_hwdep *hwdep = device->device_data;
466 
467         if (snd_BUG_ON(!hwdep))
468                 return -ENXIO;
469         mutex_lock(&register_mutex);
470         if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
471                 mutex_unlock(&register_mutex);
472                 return -EINVAL;
473         }
474         mutex_lock(&hwdep->open_mutex);
475         wake_up(&hwdep->open_wait);
476 #ifdef CONFIG_SND_OSSEMUL
477         if (hwdep->ossreg)
478                 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
479 #endif
480         snd_unregister_device(&hwdep->dev);
481         list_del_init(&hwdep->list);
482         mutex_unlock(&hwdep->open_mutex);
483         mutex_unlock(&register_mutex);
484         return 0;
485 }
486 
487 #ifdef CONFIG_SND_PROC_FS
488 /*
489  *  Info interface
490  */
491 
492 static void snd_hwdep_proc_read(struct snd_info_entry *entry,
493                                 struct snd_info_buffer *buffer)
494 {
495         struct snd_hwdep *hwdep;
496 
497         mutex_lock(&register_mutex);
498         list_for_each_entry(hwdep, &snd_hwdep_devices, list)
499                 snd_iprintf(buffer, "%02i-%02i: %s\n",
500                             hwdep->card->number, hwdep->device, hwdep->name);
501         mutex_unlock(&register_mutex);
502 }
503 
504 static struct snd_info_entry *snd_hwdep_proc_entry;
505 
506 static void __init snd_hwdep_proc_init(void)
507 {
508         struct snd_info_entry *entry;
509 
510         if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
511                 entry->c.text.read = snd_hwdep_proc_read;
512                 if (snd_info_register(entry) < 0) {
513                         snd_info_free_entry(entry);
514                         entry = NULL;
515                 }
516         }
517         snd_hwdep_proc_entry = entry;
518 }
519 
520 static void __exit snd_hwdep_proc_done(void)
521 {
522         snd_info_free_entry(snd_hwdep_proc_entry);
523 }
524 #else /* !CONFIG_SND_PROC_FS */
525 #define snd_hwdep_proc_init()
526 #define snd_hwdep_proc_done()
527 #endif /* CONFIG_SND_PROC_FS */
528 
529 
530 /*
531  *  ENTRY functions
532  */
533 
534 static int __init alsa_hwdep_init(void)
535 {
536         snd_hwdep_proc_init();
537         snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
538         snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
539         return 0;
540 }
541 
542 static void __exit alsa_hwdep_exit(void)
543 {
544         snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
545         snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
546         snd_hwdep_proc_done();
547 }
548 
549 module_init(alsa_hwdep_init)
550 module_exit(alsa_hwdep_exit)
551 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp