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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_free(struct snd_hwdep *hwdep);
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_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
154static 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
173static 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
181static 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
196static 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
213static 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
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
236static 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
256static 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
264static 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(®ister_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(®ister_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(®ister_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(®ister_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
327static 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
343
344
345
346
347
348
349
350
351
352
353
354int 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
392static 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
402static 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
408static 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(®ister_mutex);
415 if (snd_hwdep_search(hwdep->card, hwdep->device)) {
416 mutex_unlock(®ister_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(®ister_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(®ister_mutex);
448 return 0;
449}
450
451static 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(®ister_mutex);
458 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
459 mutex_unlock(®ister_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(®ister_mutex);
469 return 0;
470}
471
472#ifdef CONFIG_PROC_FS
473
474
475
476
477static 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(®ister_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(®ister_mutex);
487}
488
489static struct snd_info_entry *snd_hwdep_proc_entry;
490
491static 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
505static void __exit snd_hwdep_proc_done(void)
506{
507 snd_info_free_entry(snd_hwdep_proc_entry);
508}
509#else
510#define snd_hwdep_proc_init()
511#define snd_hwdep_proc_done()
512#endif
513
514
515
516
517
518
519static 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
527static 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
534module_init(alsa_hwdep_init)
535module_exit(alsa_hwdep_exit)
536
537EXPORT_SYMBOL(snd_hwdep_new);
538
