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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
34MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
35MODULE_DESCRIPTION("Hardware dependent layer");
36MODULE_LICENSE("GPL");
37
38static LIST_HEAD(snd_hwdep_devices);
39static DEFINE_MUTEX(register_mutex);
40
41static int snd_hwdep_dev_free(struct snd_device *device);
42static int snd_hwdep_dev_register(struct snd_device *device);
43static int snd_hwdep_dev_disconnect(struct snd_device *device);
44
45
46static 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
56static 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
64static 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
73static 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
82static 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
160static 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
179static 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
187static 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
202static 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
219static 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
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
242static 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
262static 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
270static 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(®ister_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(®ister_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(®ister_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(®ister_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
333static 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
347static void release_hwdep_device(struct device *dev)
348{
349 kfree(container_of(dev, struct snd_hwdep, dev));
350}
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365int 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}
408EXPORT_SYMBOL(snd_hwdep_new);
409
410static 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
421static 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(®ister_mutex);
428 if (snd_hwdep_search(card, hwdep->device)) {
429 mutex_unlock(®ister_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(®ister_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(®ister_mutex);
460 return 0;
461}
462
463static 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(®ister_mutex);
470 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
471 mutex_unlock(®ister_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(®ister_mutex);
484 return 0;
485}
486
487#ifdef CONFIG_SND_PROC_FS
488
489
490
491
492static 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(®ister_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(®ister_mutex);
502}
503
504static struct snd_info_entry *snd_hwdep_proc_entry;
505
506static 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
520static void __exit snd_hwdep_proc_done(void)
521{
522 snd_info_free_entry(snd_hwdep_proc_entry);
523}
524#else
525#define snd_hwdep_proc_init()
526#define snd_hwdep_proc_done()
527#endif
528
529
530
531
532
533
534static 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
542static 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
549module_init(alsa_hwdep_init)
550module_exit(alsa_hwdep_exit)
551
