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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 <linux/sched/signal.h>
29#include <sound/core.h>
30#include <sound/control.h>
31#include <sound/minors.h>
32#include <sound/hwdep.h>
33#include <sound/info.h>
34
35MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
36MODULE_DESCRIPTION("Hardware dependent layer");
37MODULE_LICENSE("GPL");
38
39static LIST_HEAD(snd_hwdep_devices);
40static DEFINE_MUTEX(register_mutex);
41
42static int snd_hwdep_dev_free(struct snd_device *device);
43static int snd_hwdep_dev_register(struct snd_device *device);
44static int snd_hwdep_dev_disconnect(struct snd_device *device);
45
46
47static 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
57static 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
65static 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
74static 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
83static 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_entry_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 snd_card_unref(hw->card);
105 return -EFAULT;
106 }
107
108 init_waitqueue_entry(&wait, current);
109 add_wait_queue(&hw->open_wait, &wait);
110 mutex_lock(&hw->open_mutex);
111 while (1) {
112 if (hw->exclusive && hw->used > 0) {
113 err = -EBUSY;
114 break;
115 }
116 if (!hw->ops.open) {
117 err = 0;
118 break;
119 }
120 err = hw->ops.open(hw, file);
121 if (err >= 0)
122 break;
123 if (err == -EAGAIN) {
124 if (file->f_flags & O_NONBLOCK) {
125 err = -EBUSY;
126 break;
127 }
128 } else
129 break;
130 set_current_state(TASK_INTERRUPTIBLE);
131 mutex_unlock(&hw->open_mutex);
132 schedule();
133 mutex_lock(&hw->open_mutex);
134 if (hw->card->shutdown) {
135 err = -ENODEV;
136 break;
137 }
138 if (signal_pending(current)) {
139 err = -ERESTARTSYS;
140 break;
141 }
142 }
143 remove_wait_queue(&hw->open_wait, &wait);
144 if (err >= 0) {
145 err = snd_card_file_add(hw->card, file);
146 if (err >= 0) {
147 file->private_data = hw;
148 hw->used++;
149 } else {
150 if (hw->ops.release)
151 hw->ops.release(hw, file);
152 }
153 }
154 mutex_unlock(&hw->open_mutex);
155 if (err < 0)
156 module_put(hw->card->module);
157 snd_card_unref(hw->card);
158 return err;
159}
160
161static int snd_hwdep_release(struct inode *inode, struct file * file)
162{
163 int err = 0;
164 struct snd_hwdep *hw = file->private_data;
165 struct module *mod = hw->card->module;
166
167 mutex_lock(&hw->open_mutex);
168 if (hw->ops.release)
169 err = hw->ops.release(hw, file);
170 if (hw->used > 0)
171 hw->used--;
172 mutex_unlock(&hw->open_mutex);
173 wake_up(&hw->open_wait);
174
175 snd_card_file_remove(hw->card, file);
176 module_put(mod);
177 return err;
178}
179
180static __poll_t snd_hwdep_poll(struct file * file, poll_table * wait)
181{
182 struct snd_hwdep *hw = file->private_data;
183 if (hw->ops.poll)
184 return hw->ops.poll(hw, file, wait);
185 return 0;
186}
187
188static int snd_hwdep_info(struct snd_hwdep *hw,
189 struct snd_hwdep_info __user *_info)
190{
191 struct snd_hwdep_info info;
192
193 memset(&info, 0, sizeof(info));
194 info.card = hw->card->number;
195 strlcpy(info.id, hw->id, sizeof(info.id));
196 strlcpy(info.name, hw->name, sizeof(info.name));
197 info.iface = hw->iface;
198 if (copy_to_user(_info, &info, sizeof(info)))
199 return -EFAULT;
200 return 0;
201}
202
203static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
204 struct snd_hwdep_dsp_status __user *_info)
205{
206 struct snd_hwdep_dsp_status info;
207 int err;
208
209 if (! hw->ops.dsp_status)
210 return -ENXIO;
211 memset(&info, 0, sizeof(info));
212 info.dsp_loaded = hw->dsp_loaded;
213 if ((err = hw->ops.dsp_status(hw, &info)) < 0)
214 return err;
215 if (copy_to_user(_info, &info, sizeof(info)))
216 return -EFAULT;
217 return 0;
218}
219
220static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
221 struct snd_hwdep_dsp_image __user *_info)
222{
223 struct snd_hwdep_dsp_image info;
224 int err;
225
226 if (! hw->ops.dsp_load)
227 return -ENXIO;
228 memset(&info, 0, sizeof(info));
229 if (copy_from_user(&info, _info, sizeof(info)))
230 return -EFAULT;
231 if (info.index >= 32)
232 return -EINVAL;
233
234 if (hw->dsp_loaded & (1 << info.index))
235 return -EBUSY;
236 err = hw->ops.dsp_load(hw, &info);
237 if (err < 0)
238 return err;
239 hw->dsp_loaded |= (1 << info.index);
240 return 0;
241}
242
243static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
244 unsigned long arg)
245{
246 struct snd_hwdep *hw = file->private_data;
247 void __user *argp = (void __user *)arg;
248 switch (cmd) {
249 case SNDRV_HWDEP_IOCTL_PVERSION:
250 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
251 case SNDRV_HWDEP_IOCTL_INFO:
252 return snd_hwdep_info(hw, argp);
253 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
254 return snd_hwdep_dsp_status(hw, argp);
255 case SNDRV_HWDEP_IOCTL_DSP_LOAD:
256 return snd_hwdep_dsp_load(hw, argp);
257 }
258 if (hw->ops.ioctl)
259 return hw->ops.ioctl(hw, file, cmd, arg);
260 return -ENOTTY;
261}
262
263static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
264{
265 struct snd_hwdep *hw = file->private_data;
266 if (hw->ops.mmap)
267 return hw->ops.mmap(hw, file, vma);
268 return -ENXIO;
269}
270
271static int snd_hwdep_control_ioctl(struct snd_card *card,
272 struct snd_ctl_file * control,
273 unsigned int cmd, unsigned long arg)
274{
275 switch (cmd) {
276 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
277 {
278 int device;
279
280 if (get_user(device, (int __user *)arg))
281 return -EFAULT;
282 mutex_lock(®ister_mutex);
283
284 if (device < 0)
285 device = 0;
286 else if (device < SNDRV_MINOR_HWDEPS)
287 device++;
288 else
289 device = SNDRV_MINOR_HWDEPS;
290
291 while (device < SNDRV_MINOR_HWDEPS) {
292 if (snd_hwdep_search(card, device))
293 break;
294 device++;
295 }
296 if (device >= SNDRV_MINOR_HWDEPS)
297 device = -1;
298 mutex_unlock(®ister_mutex);
299 if (put_user(device, (int __user *)arg))
300 return -EFAULT;
301 return 0;
302 }
303 case SNDRV_CTL_IOCTL_HWDEP_INFO:
304 {
305 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
306 int device, err;
307 struct snd_hwdep *hwdep;
308
309 if (get_user(device, &info->device))
310 return -EFAULT;
311 mutex_lock(®ister_mutex);
312 hwdep = snd_hwdep_search(card, device);
313 if (hwdep)
314 err = snd_hwdep_info(hwdep, info);
315 else
316 err = -ENXIO;
317 mutex_unlock(®ister_mutex);
318 return err;
319 }
320 }
321 return -ENOIOCTLCMD;
322}
323
324#ifdef CONFIG_COMPAT
325#include "hwdep_compat.c"
326#else
327#define snd_hwdep_ioctl_compat NULL
328#endif
329
330
331
332
333
334static const struct file_operations snd_hwdep_f_ops =
335{
336 .owner = THIS_MODULE,
337 .llseek = snd_hwdep_llseek,
338 .read = snd_hwdep_read,
339 .write = snd_hwdep_write,
340 .open = snd_hwdep_open,
341 .release = snd_hwdep_release,
342 .poll = snd_hwdep_poll,
343 .unlocked_ioctl = snd_hwdep_ioctl,
344 .compat_ioctl = snd_hwdep_ioctl_compat,
345 .mmap = snd_hwdep_mmap,
346};
347
348static void release_hwdep_device(struct device *dev)
349{
350 kfree(container_of(dev, struct snd_hwdep, dev));
351}
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366int snd_hwdep_new(struct snd_card *card, char *id, int device,
367 struct snd_hwdep **rhwdep)
368{
369 struct snd_hwdep *hwdep;
370 int err;
371 static struct snd_device_ops ops = {
372 .dev_free = snd_hwdep_dev_free,
373 .dev_register = snd_hwdep_dev_register,
374 .dev_disconnect = snd_hwdep_dev_disconnect,
375 };
376
377 if (snd_BUG_ON(!card))
378 return -ENXIO;
379 if (rhwdep)
380 *rhwdep = NULL;
381 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
382 if (!hwdep)
383 return -ENOMEM;
384
385 init_waitqueue_head(&hwdep->open_wait);
386 mutex_init(&hwdep->open_mutex);
387 hwdep->card = card;
388 hwdep->device = device;
389 if (id)
390 strlcpy(hwdep->id, id, sizeof(hwdep->id));
391
392 snd_device_initialize(&hwdep->dev, card);
393 hwdep->dev.release = release_hwdep_device;
394 dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
395#ifdef CONFIG_SND_OSSEMUL
396 hwdep->oss_type = -1;
397#endif
398
399 err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
400 if (err < 0) {
401 put_device(&hwdep->dev);
402 return err;
403 }
404
405 if (rhwdep)
406 *rhwdep = hwdep;
407 return 0;
408}
409EXPORT_SYMBOL(snd_hwdep_new);
410
411static int snd_hwdep_dev_free(struct snd_device *device)
412{
413 struct snd_hwdep *hwdep = device->device_data;
414 if (!hwdep)
415 return 0;
416 if (hwdep->private_free)
417 hwdep->private_free(hwdep);
418 put_device(&hwdep->dev);
419 return 0;
420}
421
422static int snd_hwdep_dev_register(struct snd_device *device)
423{
424 struct snd_hwdep *hwdep = device->device_data;
425 struct snd_card *card = hwdep->card;
426 int err;
427
428 mutex_lock(®ister_mutex);
429 if (snd_hwdep_search(card, hwdep->device)) {
430 mutex_unlock(®ister_mutex);
431 return -EBUSY;
432 }
433 list_add_tail(&hwdep->list, &snd_hwdep_devices);
434 err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
435 hwdep->card, hwdep->device,
436 &snd_hwdep_f_ops, hwdep, &hwdep->dev);
437 if (err < 0) {
438 dev_err(&hwdep->dev, "unable to register\n");
439 list_del(&hwdep->list);
440 mutex_unlock(®ister_mutex);
441 return err;
442 }
443
444#ifdef CONFIG_SND_OSSEMUL
445 hwdep->ossreg = 0;
446 if (hwdep->oss_type >= 0) {
447 if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
448 hwdep->device)
449 dev_warn(&hwdep->dev,
450 "only hwdep device 0 can be registered as OSS direct FM device!\n");
451 else if (snd_register_oss_device(hwdep->oss_type,
452 card, hwdep->device,
453 &snd_hwdep_f_ops, hwdep) < 0)
454 dev_warn(&hwdep->dev,
455 "unable to register OSS compatibility device\n");
456 else
457 hwdep->ossreg = 1;
458 }
459#endif
460 mutex_unlock(®ister_mutex);
461 return 0;
462}
463
464static int snd_hwdep_dev_disconnect(struct snd_device *device)
465{
466 struct snd_hwdep *hwdep = device->device_data;
467
468 if (snd_BUG_ON(!hwdep))
469 return -ENXIO;
470 mutex_lock(®ister_mutex);
471 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
472 mutex_unlock(®ister_mutex);
473 return -EINVAL;
474 }
475 mutex_lock(&hwdep->open_mutex);
476 wake_up(&hwdep->open_wait);
477#ifdef CONFIG_SND_OSSEMUL
478 if (hwdep->ossreg)
479 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
480#endif
481 snd_unregister_device(&hwdep->dev);
482 list_del_init(&hwdep->list);
483 mutex_unlock(&hwdep->open_mutex);
484 mutex_unlock(®ister_mutex);
485 return 0;
486}
487
488#ifdef CONFIG_SND_PROC_FS
489
490
491
492
493static void snd_hwdep_proc_read(struct snd_info_entry *entry,
494 struct snd_info_buffer *buffer)
495{
496 struct snd_hwdep *hwdep;
497
498 mutex_lock(®ister_mutex);
499 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
500 snd_iprintf(buffer, "%02i-%02i: %s\n",
501 hwdep->card->number, hwdep->device, hwdep->name);
502 mutex_unlock(®ister_mutex);
503}
504
505static struct snd_info_entry *snd_hwdep_proc_entry;
506
507static void __init snd_hwdep_proc_init(void)
508{
509 struct snd_info_entry *entry;
510
511 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
512 entry->c.text.read = snd_hwdep_proc_read;
513 if (snd_info_register(entry) < 0) {
514 snd_info_free_entry(entry);
515 entry = NULL;
516 }
517 }
518 snd_hwdep_proc_entry = entry;
519}
520
521static void __exit snd_hwdep_proc_done(void)
522{
523 snd_info_free_entry(snd_hwdep_proc_entry);
524}
525#else
526#define snd_hwdep_proc_init()
527#define snd_hwdep_proc_done()
528#endif
529
530
531
532
533
534
535static int __init alsa_hwdep_init(void)
536{
537 snd_hwdep_proc_init();
538 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
539 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
540 return 0;
541}
542
543static void __exit alsa_hwdep_exit(void)
544{
545 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
546 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
547 snd_hwdep_proc_done();
548}
549
550module_init(alsa_hwdep_init)
551module_exit(alsa_hwdep_exit)
552
