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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 <sound/core.h>
28#include <sound/control.h>
29#include <sound/minors.h>
30#include <sound/hwdep.h>
31#include <sound/info.h>
32
33MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
34MODULE_DESCRIPTION("Hardware dependent layer");
35MODULE_LICENSE("GPL");
36
37static LIST_HEAD(snd_hwdep_devices);
38static DEFINE_MUTEX(register_mutex);
39
40static int snd_hwdep_free(struct snd_hwdep *hwdep);
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 (!hw->ops.open)
103 return -ENXIO;
104
105 if (!try_module_get(hw->card->module))
106 return -EFAULT;
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 err = hw->ops.open(hw, file);
117 if (err >= 0)
118 break;
119 if (err == -EAGAIN) {
120 if (file->f_flags & O_NONBLOCK) {
121 err = -EBUSY;
122 break;
123 }
124 } else
125 break;
126 set_current_state(TASK_INTERRUPTIBLE);
127 mutex_unlock(&hw->open_mutex);
128 schedule();
129 mutex_lock(&hw->open_mutex);
130 if (signal_pending(current)) {
131 err = -ERESTARTSYS;
132 break;
133 }
134 }
135 remove_wait_queue(&hw->open_wait, &wait);
136 if (err >= 0) {
137 err = snd_card_file_add(hw->card, file);
138 if (err >= 0) {
139 file->private_data = hw;
140 hw->used++;
141 } else {
142 if (hw->ops.release)
143 hw->ops.release(hw, file);
144 }
145 }
146 mutex_unlock(&hw->open_mutex);
147 if (err < 0)
148 module_put(hw->card->module);
149 return err;
150}
151
152static int snd_hwdep_release(struct inode *inode, struct file * file)
153{
154 int err = -ENXIO;
155 struct snd_hwdep *hw = file->private_data;
156 struct module *mod = hw->card->module;
157
158 mutex_lock(&hw->open_mutex);
159 if (hw->ops.release)
160 err = hw->ops.release(hw, file);
161 if (hw->used > 0)
162 hw->used--;
163 mutex_unlock(&hw->open_mutex);
164 wake_up(&hw->open_wait);
165
166 snd_card_file_remove(hw->card, file);
167 module_put(mod);
168 return err;
169}
170
171static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
172{
173 struct snd_hwdep *hw = file->private_data;
174 if (hw->ops.poll)
175 return hw->ops.poll(hw, file, wait);
176 return 0;
177}
178
179static int snd_hwdep_info(struct snd_hwdep *hw,
180 struct snd_hwdep_info __user *_info)
181{
182 struct snd_hwdep_info info;
183
184 memset(&info, 0, sizeof(info));
185 info.card = hw->card->number;
186 strlcpy(info.id, hw->id, sizeof(info.id));
187 strlcpy(info.name, hw->name, sizeof(info.name));
188 info.iface = hw->iface;
189 if (copy_to_user(_info, &info, sizeof(info)))
190 return -EFAULT;
191 return 0;
192}
193
194static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
195 struct snd_hwdep_dsp_status __user *_info)
196{
197 struct snd_hwdep_dsp_status info;
198 int err;
199
200 if (! hw->ops.dsp_status)
201 return -ENXIO;
202 memset(&info, 0, sizeof(info));
203 info.dsp_loaded = hw->dsp_loaded;
204 if ((err = hw->ops.dsp_status(hw, &info)) < 0)
205 return err;
206 if (copy_to_user(_info, &info, sizeof(info)))
207 return -EFAULT;
208 return 0;
209}
210
211static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
212 struct snd_hwdep_dsp_image __user *_info)
213{
214 struct snd_hwdep_dsp_image info;
215 int err;
216
217 if (! hw->ops.dsp_load)
218 return -ENXIO;
219 memset(&info, 0, sizeof(info));
220 if (copy_from_user(&info, _info, sizeof(info)))
221 return -EFAULT;
222
223 if (hw->dsp_loaded & (1 << info.index))
224 return -EBUSY;
225 if (!access_ok(VERIFY_READ, info.image, info.length))
226 return -EFAULT;
227 err = hw->ops.dsp_load(hw, &info);
228 if (err < 0)
229 return err;
230 hw->dsp_loaded |= (1 << info.index);
231 return 0;
232}
233
234static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
235 unsigned long arg)
236{
237 struct snd_hwdep *hw = file->private_data;
238 void __user *argp = (void __user *)arg;
239 switch (cmd) {
240 case SNDRV_HWDEP_IOCTL_PVERSION:
241 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
242 case SNDRV_HWDEP_IOCTL_INFO:
243 return snd_hwdep_info(hw, argp);
244 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
245 return snd_hwdep_dsp_status(hw, argp);
246 case SNDRV_HWDEP_IOCTL_DSP_LOAD:
247 return snd_hwdep_dsp_load(hw, argp);
248 }
249 if (hw->ops.ioctl)
250 return hw->ops.ioctl(hw, file, cmd, arg);
251 return -ENOTTY;
252}
253
254static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
255{
256 struct snd_hwdep *hw = file->private_data;
257 if (hw->ops.mmap)
258 return hw->ops.mmap(hw, file, vma);
259 return -ENXIO;
260}
261
262static int snd_hwdep_control_ioctl(struct snd_card *card,
263 struct snd_ctl_file * control,
264 unsigned int cmd, unsigned long arg)
265{
266 switch (cmd) {
267 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
268 {
269 int device;
270
271 if (get_user(device, (int __user *)arg))
272 return -EFAULT;
273 mutex_lock(®ister_mutex);
274 device = device < 0 ? 0 : device + 1;
275 while (device < SNDRV_MINOR_HWDEPS) {
276 if (snd_hwdep_search(card, device))
277 break;
278 device++;
279 }
280 if (device >= SNDRV_MINOR_HWDEPS)
281 device = -1;
282 mutex_unlock(®ister_mutex);
283 if (put_user(device, (int __user *)arg))
284 return -EFAULT;
285 return 0;
286 }
287 case SNDRV_CTL_IOCTL_HWDEP_INFO:
288 {
289 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
290 int device, err;
291 struct snd_hwdep *hwdep;
292
293 if (get_user(device, &info->device))
294 return -EFAULT;
295 mutex_lock(®ister_mutex);
296 hwdep = snd_hwdep_search(card, device);
297 if (hwdep)
298 err = snd_hwdep_info(hwdep, info);
299 else
300 err = -ENXIO;
301 mutex_unlock(®ister_mutex);
302 return err;
303 }
304 }
305 return -ENOIOCTLCMD;
306}
307
308#ifdef CONFIG_COMPAT
309#include "hwdep_compat.c"
310#else
311#define snd_hwdep_ioctl_compat NULL
312#endif
313
314
315
316
317
318static const struct file_operations snd_hwdep_f_ops =
319{
320 .owner = THIS_MODULE,
321 .llseek = snd_hwdep_llseek,
322 .read = snd_hwdep_read,
323 .write = snd_hwdep_write,
324 .open = snd_hwdep_open,
325 .release = snd_hwdep_release,
326 .poll = snd_hwdep_poll,
327 .unlocked_ioctl = snd_hwdep_ioctl,
328 .compat_ioctl = snd_hwdep_ioctl_compat,
329 .mmap = snd_hwdep_mmap,
330};
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345int snd_hwdep_new(struct snd_card *card, char *id, int device,
346 struct snd_hwdep **rhwdep)
347{
348 struct snd_hwdep *hwdep;
349 int err;
350 static struct snd_device_ops ops = {
351 .dev_free = snd_hwdep_dev_free,
352 .dev_register = snd_hwdep_dev_register,
353 .dev_disconnect = snd_hwdep_dev_disconnect,
354 };
355
356 snd_assert(rhwdep != NULL, return -EINVAL);
357 *rhwdep = NULL;
358 snd_assert(card != NULL, return -ENXIO);
359 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
360 if (hwdep == NULL) {
361 snd_printk(KERN_ERR "hwdep: cannot allocate\n");
362 return -ENOMEM;
363 }
364 hwdep->card = card;
365 hwdep->device = device;
366 if (id)
367 strlcpy(hwdep->id, id, sizeof(hwdep->id));
368#ifdef CONFIG_SND_OSSEMUL
369 hwdep->oss_type = -1;
370#endif
371 if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
372 snd_hwdep_free(hwdep);
373 return err;
374 }
375 init_waitqueue_head(&hwdep->open_wait);
376 mutex_init(&hwdep->open_mutex);
377 *rhwdep = hwdep;
378 return 0;
379}
380
381static int snd_hwdep_free(struct snd_hwdep *hwdep)
382{
383 snd_assert(hwdep != NULL, return -ENXIO);
384 if (hwdep->private_free)
385 hwdep->private_free(hwdep);
386 kfree(hwdep);
387 return 0;
388}
389
390static int snd_hwdep_dev_free(struct snd_device *device)
391{
392 struct snd_hwdep *hwdep = device->device_data;
393 return snd_hwdep_free(hwdep);
394}
395
396static int snd_hwdep_dev_register(struct snd_device *device)
397{
398 struct snd_hwdep *hwdep = device->device_data;
399 int err;
400 char name[32];
401
402 mutex_lock(®ister_mutex);
403 if (snd_hwdep_search(hwdep->card, hwdep->device)) {
404 mutex_unlock(®ister_mutex);
405 return -EBUSY;
406 }
407 list_add_tail(&hwdep->list, &snd_hwdep_devices);
408 sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
409 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
410 hwdep->card, hwdep->device,
411 &snd_hwdep_f_ops, hwdep, name)) < 0) {
412 snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
413 hwdep->card->number, hwdep->device);
414 list_del(&hwdep->list);
415 mutex_unlock(®ister_mutex);
416 return err;
417 }
418#ifdef CONFIG_SND_OSSEMUL
419 hwdep->ossreg = 0;
420 if (hwdep->oss_type >= 0) {
421 if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
422 snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
423 } else {
424 if (snd_register_oss_device(hwdep->oss_type,
425 hwdep->card, hwdep->device,
426 &snd_hwdep_f_ops, hwdep,
427 hwdep->oss_dev) < 0) {
428 snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
429 hwdep->card->number, hwdep->device);
430 } else
431 hwdep->ossreg = 1;
432 }
433 }
434#endif
435 mutex_unlock(®ister_mutex);
436 return 0;
437}
438
439static int snd_hwdep_dev_disconnect(struct snd_device *device)
440{
441 struct snd_hwdep *hwdep = device->device_data;
442
443 snd_assert(hwdep != NULL, return -ENXIO);
444 mutex_lock(®ister_mutex);
445 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
446 mutex_unlock(®ister_mutex);
447 return -EINVAL;
448 }
449#ifdef CONFIG_SND_OSSEMUL
450 if (hwdep->ossreg)
451 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
452#endif
453 snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
454 list_del_init(&hwdep->list);
455 mutex_unlock(®ister_mutex);
456 return 0;
457}
458
459#ifdef CONFIG_PROC_FS
460
461
462
463
464static void snd_hwdep_proc_read(struct snd_info_entry *entry,
465 struct snd_info_buffer *buffer)
466{
467 struct snd_hwdep *hwdep;
468
469 mutex_lock(®ister_mutex);
470 list_for_each_entry(hwdep, &snd_hwdep_devices, list)
471 snd_iprintf(buffer, "%02i-%02i: %s\n",
472 hwdep->card->number, hwdep->device, hwdep->name);
473 mutex_unlock(®ister_mutex);
474}
475
476static struct snd_info_entry *snd_hwdep_proc_entry;
477
478static void __init snd_hwdep_proc_init(void)
479{
480 struct snd_info_entry *entry;
481
482 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
483 entry->c.text.read = snd_hwdep_proc_read;
484 if (snd_info_register(entry) < 0) {
485 snd_info_free_entry(entry);
486 entry = NULL;
487 }
488 }
489 snd_hwdep_proc_entry = entry;
490}
491
492static void __exit snd_hwdep_proc_done(void)
493{
494 snd_info_free_entry(snd_hwdep_proc_entry);
495}
496#else
497#define snd_hwdep_proc_init()
498#define snd_hwdep_proc_done()
499#endif
500
501
502
503
504
505
506static int __init alsa_hwdep_init(void)
507{
508 snd_hwdep_proc_init();
509 snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
510 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
511 return 0;
512}
513
514static void __exit alsa_hwdep_exit(void)
515{
516 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
517 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
518 snd_hwdep_proc_done();
519}
520
521module_init(alsa_hwdep_init)
522module_exit(alsa_hwdep_exit)
523
524EXPORT_SYMBOL(snd_hwdep_new);
525
