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7#include <linux/major.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/time.h>
11#include <linux/mutex.h>
12#include <linux/module.h>
13#include <linux/sched/signal.h>
14#include <sound/core.h>
15#include <sound/control.h>
16#include <sound/minors.h>
17#include <sound/hwdep.h>
18#include <sound/info.h>
19
20MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
21MODULE_DESCRIPTION("Hardware dependent layer");
22MODULE_LICENSE("GPL");
23
24static LIST_HEAD(snd_hwdep_devices);
25static DEFINE_MUTEX(register_mutex);
26
27static int snd_hwdep_dev_free(struct snd_device *device);
28static int snd_hwdep_dev_register(struct snd_device *device);
29static int snd_hwdep_dev_disconnect(struct snd_device *device);
30
31
32static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
33{
34 struct snd_hwdep *hwdep;
35
36 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
37 if (hwdep->card == card && hwdep->device == device)
38 return hwdep;
39 return NULL;
40}
41
42static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
43{
44 struct snd_hwdep *hw = file->private_data;
45 if (hw->ops.llseek)
46 return hw->ops.llseek(hw, file, offset, orig);
47 return -ENXIO;
48}
49
50static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
51 size_t count, loff_t *offset)
52{
53 struct snd_hwdep *hw = file->private_data;
54 if (hw->ops.read)
55 return hw->ops.read(hw, buf, count, offset);
56 return -ENXIO;
57}
58
59static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
60 size_t count, loff_t *offset)
61{
62 struct snd_hwdep *hw = file->private_data;
63 if (hw->ops.write)
64 return hw->ops.write(hw, buf, count, offset);
65 return -ENXIO;
66}
67
68static int snd_hwdep_open(struct inode *inode, struct file * file)
69{
70 int major = imajor(inode);
71 struct snd_hwdep *hw;
72 int err;
73 wait_queue_entry_t wait;
74
75 if (major == snd_major) {
76 hw = snd_lookup_minor_data(iminor(inode),
77 SNDRV_DEVICE_TYPE_HWDEP);
78#ifdef CONFIG_SND_OSSEMUL
79 } else if (major == SOUND_MAJOR) {
80 hw = snd_lookup_oss_minor_data(iminor(inode),
81 SNDRV_OSS_DEVICE_TYPE_DMFM);
82#endif
83 } else
84 return -ENXIO;
85 if (hw == NULL)
86 return -ENODEV;
87
88 if (!try_module_get(hw->card->module)) {
89 snd_card_unref(hw->card);
90 return -EFAULT;
91 }
92
93 init_waitqueue_entry(&wait, current);
94 add_wait_queue(&hw->open_wait, &wait);
95 mutex_lock(&hw->open_mutex);
96 while (1) {
97 if (hw->exclusive && hw->used > 0) {
98 err = -EBUSY;
99 break;
100 }
101 if (!hw->ops.open) {
102 err = 0;
103 break;
104 }
105 err = hw->ops.open(hw, file);
106 if (err >= 0)
107 break;
108 if (err == -EAGAIN) {
109 if (file->f_flags & O_NONBLOCK) {
110 err = -EBUSY;
111 break;
112 }
113 } else
114 break;
115 set_current_state(TASK_INTERRUPTIBLE);
116 mutex_unlock(&hw->open_mutex);
117 schedule();
118 mutex_lock(&hw->open_mutex);
119 if (hw->card->shutdown) {
120 err = -ENODEV;
121 break;
122 }
123 if (signal_pending(current)) {
124 err = -ERESTARTSYS;
125 break;
126 }
127 }
128 remove_wait_queue(&hw->open_wait, &wait);
129 if (err >= 0) {
130 err = snd_card_file_add(hw->card, file);
131 if (err >= 0) {
132 file->private_data = hw;
133 hw->used++;
134 } else {
135 if (hw->ops.release)
136 hw->ops.release(hw, file);
137 }
138 }
139 mutex_unlock(&hw->open_mutex);
140 if (err < 0)
141 module_put(hw->card->module);
142 snd_card_unref(hw->card);
143 return err;
144}
145
146static int snd_hwdep_release(struct inode *inode, struct file * file)
147{
148 int err = 0;
149 struct snd_hwdep *hw = file->private_data;
150 struct module *mod = hw->card->module;
151
152 mutex_lock(&hw->open_mutex);
153 if (hw->ops.release)
154 err = hw->ops.release(hw, file);
155 if (hw->used > 0)
156 hw->used--;
157 mutex_unlock(&hw->open_mutex);
158 wake_up(&hw->open_wait);
159
160 snd_card_file_remove(hw->card, file);
161 module_put(mod);
162 return err;
163}
164
165static __poll_t snd_hwdep_poll(struct file * file, poll_table * wait)
166{
167 struct snd_hwdep *hw = file->private_data;
168 if (hw->ops.poll)
169 return hw->ops.poll(hw, file, wait);
170 return 0;
171}
172
173static int snd_hwdep_info(struct snd_hwdep *hw,
174 struct snd_hwdep_info __user *_info)
175{
176 struct snd_hwdep_info info;
177
178 memset(&info, 0, sizeof(info));
179 info.card = hw->card->number;
180 strlcpy(info.id, hw->id, sizeof(info.id));
181 strlcpy(info.name, hw->name, sizeof(info.name));
182 info.iface = hw->iface;
183 if (copy_to_user(_info, &info, sizeof(info)))
184 return -EFAULT;
185 return 0;
186}
187
188static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
189 struct snd_hwdep_dsp_status __user *_info)
190{
191 struct snd_hwdep_dsp_status info;
192 int err;
193
194 if (! hw->ops.dsp_status)
195 return -ENXIO;
196 memset(&info, 0, sizeof(info));
197 info.dsp_loaded = hw->dsp_loaded;
198 if ((err = hw->ops.dsp_status(hw, &info)) < 0)
199 return err;
200 if (copy_to_user(_info, &info, sizeof(info)))
201 return -EFAULT;
202 return 0;
203}
204
205static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
206 struct snd_hwdep_dsp_image __user *_info)
207{
208 struct snd_hwdep_dsp_image info;
209 int err;
210
211 if (! hw->ops.dsp_load)
212 return -ENXIO;
213 memset(&info, 0, sizeof(info));
214 if (copy_from_user(&info, _info, sizeof(info)))
215 return -EFAULT;
216 if (info.index >= 32)
217 return -EINVAL;
218
219 if (hw->dsp_loaded & (1 << info.index))
220 return -EBUSY;
221 err = hw->ops.dsp_load(hw, &info);
222 if (err < 0)
223 return err;
224 hw->dsp_loaded |= (1 << info.index);
225 return 0;
226}
227
228static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
229 unsigned long arg)
230{
231 struct snd_hwdep *hw = file->private_data;
232 void __user *argp = (void __user *)arg;
233 switch (cmd) {
234 case SNDRV_HWDEP_IOCTL_PVERSION:
235 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
236 case SNDRV_HWDEP_IOCTL_INFO:
237 return snd_hwdep_info(hw, argp);
238 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
239 return snd_hwdep_dsp_status(hw, argp);
240 case SNDRV_HWDEP_IOCTL_DSP_LOAD:
241 return snd_hwdep_dsp_load(hw, argp);
242 }
243 if (hw->ops.ioctl)
244 return hw->ops.ioctl(hw, file, cmd, arg);
245 return -ENOTTY;
246}
247
248static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
249{
250 struct snd_hwdep *hw = file->private_data;
251 if (hw->ops.mmap)
252 return hw->ops.mmap(hw, file, vma);
253 return -ENXIO;
254}
255
256static int snd_hwdep_control_ioctl(struct snd_card *card,
257 struct snd_ctl_file * control,
258 unsigned int cmd, unsigned long arg)
259{
260 switch (cmd) {
261 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
262 {
263 int device;
264
265 if (get_user(device, (int __user *)arg))
266 return -EFAULT;
267 mutex_lock(®ister_mutex);
268
269 if (device < 0)
270 device = 0;
271 else if (device < SNDRV_MINOR_HWDEPS)
272 device++;
273 else
274 device = SNDRV_MINOR_HWDEPS;
275
276 while (device < SNDRV_MINOR_HWDEPS) {
277 if (snd_hwdep_search(card, device))
278 break;
279 device++;
280 }
281 if (device >= SNDRV_MINOR_HWDEPS)
282 device = -1;
283 mutex_unlock(®ister_mutex);
284 if (put_user(device, (int __user *)arg))
285 return -EFAULT;
286 return 0;
287 }
288 case SNDRV_CTL_IOCTL_HWDEP_INFO:
289 {
290 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
291 int device, err;
292 struct snd_hwdep *hwdep;
293
294 if (get_user(device, &info->device))
295 return -EFAULT;
296 mutex_lock(®ister_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(®ister_mutex);
303 return err;
304 }
305 }
306 return -ENOIOCTLCMD;
307}
308
309#ifdef CONFIG_COMPAT
310#include "hwdep_compat.c"
311#else
312#define snd_hwdep_ioctl_compat NULL
313#endif
314
315
316
317
318
319static const struct file_operations snd_hwdep_f_ops =
320{
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,
331};
332
333static void release_hwdep_device(struct device *dev)
334{
335 kfree(container_of(dev, struct snd_hwdep, dev));
336}
337
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348
349
350
351int snd_hwdep_new(struct snd_card *card, char *id, int device,
352 struct snd_hwdep **rhwdep)
353{
354 struct snd_hwdep *hwdep;
355 int err;
356 static struct snd_device_ops ops = {
357 .dev_free = snd_hwdep_dev_free,
358 .dev_register = snd_hwdep_dev_register,
359 .dev_disconnect = snd_hwdep_dev_disconnect,
360 };
361
362 if (snd_BUG_ON(!card))
363 return -ENXIO;
364 if (rhwdep)
365 *rhwdep = NULL;
366 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
367 if (!hwdep)
368 return -ENOMEM;
369
370 init_waitqueue_head(&hwdep->open_wait);
371 mutex_init(&hwdep->open_mutex);
372 hwdep->card = card;
373 hwdep->device = device;
374 if (id)
375 strlcpy(hwdep->id, id, sizeof(hwdep->id));
376
377 snd_device_initialize(&hwdep->dev, card);
378 hwdep->dev.release = release_hwdep_device;
379 dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
380#ifdef CONFIG_SND_OSSEMUL
381 hwdep->oss_type = -1;
382#endif
383
384 err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
385 if (err < 0) {
386 put_device(&hwdep->dev);
387 return err;
388 }
389
390 if (rhwdep)
391 *rhwdep = hwdep;
392 return 0;
393}
394EXPORT_SYMBOL(snd_hwdep_new);
395
396static int snd_hwdep_dev_free(struct snd_device *device)
397{
398 struct snd_hwdep *hwdep = device->device_data;
399 if (!hwdep)
400 return 0;
401 if (hwdep->private_free)
402 hwdep->private_free(hwdep);
403 put_device(&hwdep->dev);
404 return 0;
405}
406
407static int snd_hwdep_dev_register(struct snd_device *device)
408{
409 struct snd_hwdep *hwdep = device->device_data;
410 struct snd_card *card = hwdep->card;
411 int err;
412
413 mutex_lock(®ister_mutex);
414 if (snd_hwdep_search(card, hwdep->device)) {
415 mutex_unlock(®ister_mutex);
416 return -EBUSY;
417 }
418 list_add_tail(&hwdep->list, &snd_hwdep_devices);
419 err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
420 hwdep->card, hwdep->device,
421 &snd_hwdep_f_ops, hwdep, &hwdep->dev);
422 if (err < 0) {
423 dev_err(&hwdep->dev, "unable to register\n");
424 list_del(&hwdep->list);
425 mutex_unlock(®ister_mutex);
426 return err;
427 }
428
429#ifdef CONFIG_SND_OSSEMUL
430 hwdep->ossreg = 0;
431 if (hwdep->oss_type >= 0) {
432 if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
433 hwdep->device)
434 dev_warn(&hwdep->dev,
435 "only hwdep device 0 can be registered as OSS direct FM device!\n");
436 else if (snd_register_oss_device(hwdep->oss_type,
437 card, hwdep->device,
438 &snd_hwdep_f_ops, hwdep) < 0)
439 dev_warn(&hwdep->dev,
440 "unable to register OSS compatibility device\n");
441 else
442 hwdep->ossreg = 1;
443 }
444#endif
445 mutex_unlock(®ister_mutex);
446 return 0;
447}
448
449static int snd_hwdep_dev_disconnect(struct snd_device *device)
450{
451 struct snd_hwdep *hwdep = device->device_data;
452
453 if (snd_BUG_ON(!hwdep))
454 return -ENXIO;
455 mutex_lock(®ister_mutex);
456 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
457 mutex_unlock(®ister_mutex);
458 return -EINVAL;
459 }
460 mutex_lock(&hwdep->open_mutex);
461 wake_up(&hwdep->open_wait);
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(&hwdep->dev);
467 list_del_init(&hwdep->list);
468 mutex_unlock(&hwdep->open_mutex);
469 mutex_unlock(®ister_mutex);
470 return 0;
471}
472
473#ifdef CONFIG_SND_PROC_FS
474
475
476
477
478static void snd_hwdep_proc_read(struct snd_info_entry *entry,
479 struct snd_info_buffer *buffer)
480{
481 struct snd_hwdep *hwdep;
482
483 mutex_lock(®ister_mutex);
484 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
485 snd_iprintf(buffer, "%02i-%02i: %s\n",
486 hwdep->card->number, hwdep->device, hwdep->name);
487 mutex_unlock(®ister_mutex);
488}
489
490static struct snd_info_entry *snd_hwdep_proc_entry;
491
492static void __init snd_hwdep_proc_init(void)
493{
494 struct snd_info_entry *entry;
495
496 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
497 entry->c.text.read = snd_hwdep_proc_read;
498 if (snd_info_register(entry) < 0) {
499 snd_info_free_entry(entry);
500 entry = NULL;
501 }
502 }
503 snd_hwdep_proc_entry = entry;
504}
505
506static void __exit snd_hwdep_proc_done(void)
507{
508 snd_info_free_entry(snd_hwdep_proc_entry);
509}
510#else
511#define snd_hwdep_proc_init()
512#define snd_hwdep_proc_done()
513#endif
514
515
516
517
518
519
520static int __init alsa_hwdep_init(void)
521{
522 snd_hwdep_proc_init();
523 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
524 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
525 return 0;
526}
527
528static void __exit alsa_hwdep_exit(void)
529{
530 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
531 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
532 snd_hwdep_proc_done();
533}
534
535module_init(alsa_hwdep_init)
536module_exit(alsa_hwdep_exit)
537
