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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[nv-tegra-linux-2.6.git] / sound / core / rawmidi.c
blob0f5a194695d90c892b3585031176249de5e4b62b
1 /*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/core.h>
23 #include <linux/major.h>
24 #include <linux/init.h>
25 #include <linux/sched.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/mutex.h>
30 #include <linux/moduleparam.h>
31 #include <linux/delay.h>
32 #include <sound/rawmidi.h>
33 #include <sound/info.h>
34 #include <sound/control.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40 MODULE_LICENSE("GPL");
41
42 #ifdef CONFIG_SND_OSSEMUL
43 static int midi_map[SNDRV_CARDS];
44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45 module_param_array(midi_map, int, NULL, 0444);
46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47 module_param_array(amidi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49 #endif /* CONFIG_SND_OSSEMUL */
50
51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52 static int snd_rawmidi_dev_free(struct snd_device *device);
53 static int snd_rawmidi_dev_register(struct snd_device *device);
54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56 static LIST_HEAD(snd_rawmidi_devices);
57 static DEFINE_MUTEX(register_mutex);
58
59 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
60 {
61 struct snd_rawmidi *rawmidi;
62
63 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
64 if (rawmidi->card == card && rawmidi->device == device)
65 return rawmidi;
66 return NULL;
67 }
68
69 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
70 {
71 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
72 case FMODE_WRITE:
73 return SNDRV_RAWMIDI_LFLG_OUTPUT;
74 case FMODE_READ:
75 return SNDRV_RAWMIDI_LFLG_INPUT;
76 default:
77 return SNDRV_RAWMIDI_LFLG_OPEN;
78 }
79 }
80
81 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
82 {
83 struct snd_rawmidi_runtime *runtime = substream->runtime;
84 return runtime->avail >= runtime->avail_min;
85 }
86
87 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
88 size_t count)
89 {
90 struct snd_rawmidi_runtime *runtime = substream->runtime;
91 return runtime->avail >= runtime->avail_min &&
92 (!substream->append || runtime->avail >= count);
93 }
94
95 static void snd_rawmidi_input_event_tasklet(unsigned long data)
96 {
97 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
98 substream->runtime->event(substream);
99 }
100
101 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
102 {
103 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
104 substream->ops->trigger(substream, 1);
105 }
106
107 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
108 {
109 struct snd_rawmidi_runtime *runtime;
110
111 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
112 return -ENOMEM;
113 spin_lock_init(&runtime->lock);
114 init_waitqueue_head(&runtime->sleep);
115 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
116 tasklet_init(&runtime->tasklet,
117 snd_rawmidi_input_event_tasklet,
118 (unsigned long)substream);
119 else
120 tasklet_init(&runtime->tasklet,
121 snd_rawmidi_output_trigger_tasklet,
122 (unsigned long)substream);
123 runtime->event = NULL;
124 runtime->buffer_size = PAGE_SIZE;
125 runtime->avail_min = 1;
126 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
127 runtime->avail = 0;
128 else
129 runtime->avail = runtime->buffer_size;
130 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
131 kfree(runtime);
132 return -ENOMEM;
133 }
134 runtime->appl_ptr = runtime->hw_ptr = 0;
135 substream->runtime = runtime;
136 return 0;
137 }
138
139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
140 {
141 struct snd_rawmidi_runtime *runtime = substream->runtime;
142
143 kfree(runtime->buffer);
144 kfree(runtime);
145 substream->runtime = NULL;
146 return 0;
147 }
148
149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
150 {
151 if (!substream->opened)
152 return;
153 if (up) {
154 tasklet_schedule(&substream->runtime->tasklet);
155 } else {
156 tasklet_kill(&substream->runtime->tasklet);
157 substream->ops->trigger(substream, 0);
158 }
159 }
160
161 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
162 {
163 if (!substream->opened)
164 return;
165 substream->ops->trigger(substream, up);
166 if (!up && substream->runtime->event)
167 tasklet_kill(&substream->runtime->tasklet);
168 }
169
170 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
171 {
172 unsigned long flags;
173 struct snd_rawmidi_runtime *runtime = substream->runtime;
174
175 snd_rawmidi_output_trigger(substream, 0);
176 runtime->drain = 0;
177 spin_lock_irqsave(&runtime->lock, flags);
178 runtime->appl_ptr = runtime->hw_ptr = 0;
179 runtime->avail = runtime->buffer_size;
180 spin_unlock_irqrestore(&runtime->lock, flags);
181 return 0;
182 }
183
184 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
185 {
186 int err;
187 long timeout;
188 struct snd_rawmidi_runtime *runtime = substream->runtime;
189
190 err = 0;
191 runtime->drain = 1;
192 timeout = wait_event_interruptible_timeout(runtime->sleep,
193 (runtime->avail >= runtime->buffer_size),
194 10*HZ);
195 if (signal_pending(current))
196 err = -ERESTARTSYS;
197 if (runtime->avail < runtime->buffer_size && !timeout) {
198 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
199 err = -EIO;
200 }
201 runtime->drain = 0;
202 if (err != -ERESTARTSYS) {
203 /* we need wait a while to make sure that Tx FIFOs are empty */
204 if (substream->ops->drain)
205 substream->ops->drain(substream);
206 else
207 msleep(50);
208 snd_rawmidi_drop_output(substream);
209 }
210 return err;
211 }
212
213 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
214 {
215 unsigned long flags;
216 struct snd_rawmidi_runtime *runtime = substream->runtime;
217
218 snd_rawmidi_input_trigger(substream, 0);
219 runtime->drain = 0;
220 spin_lock_irqsave(&runtime->lock, flags);
221 runtime->appl_ptr = runtime->hw_ptr = 0;
222 runtime->avail = 0;
223 spin_unlock_irqrestore(&runtime->lock, flags);
224 return 0;
225 }
226
227 /* look for an available substream for the given stream direction;
228 * if a specific subdevice is given, try to assign it
229 */
230 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
231 int stream, int mode,
232 struct snd_rawmidi_substream **sub_ret)
233 {
234 struct snd_rawmidi_substream *substream;
235 struct snd_rawmidi_str *s = &rmidi->streams[stream];
236 static unsigned int info_flags[2] = {
237 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
238 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
239 };
240
241 if (!(rmidi->info_flags & info_flags[stream]))
242 return -ENXIO;
243 if (subdevice >= 0 && subdevice >= s->substream_count)
244 return -ENODEV;
245
246 list_for_each_entry(substream, &s->substreams, list) {
247 if (substream->opened) {
248 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
249 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
250 !substream->append)
251 continue;
252 }
253 if (subdevice < 0 || subdevice == substream->number) {
254 *sub_ret = substream;
255 return 0;
256 }
257 }
258 return -EAGAIN;
259 }
260
261 /* open and do ref-counting for the given substream */
262 static int open_substream(struct snd_rawmidi *rmidi,
263 struct snd_rawmidi_substream *substream,
264 int mode)
265 {
266 int err;
267
268 if (substream->use_count == 0) {
269 err = snd_rawmidi_runtime_create(substream);
270 if (err < 0)
271 return err;
272 err = substream->ops->open(substream);
273 if (err < 0) {
274 snd_rawmidi_runtime_free(substream);
275 return err;
276 }
277 substream->opened = 1;
278 substream->active_sensing = 0;
279 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
280 substream->append = 1;
281 substream->pid = get_pid(task_pid(current));
282 rmidi->streams[substream->stream].substream_opened++;
283 }
284 substream->use_count++;
285 return 0;
286 }
287
288 static void close_substream(struct snd_rawmidi *rmidi,
289 struct snd_rawmidi_substream *substream,
290 int cleanup);
291
292 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
293 struct snd_rawmidi_file *rfile)
294 {
295 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
296 int err;
297
298 rfile->input = rfile->output = NULL;
299 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
300 err = assign_substream(rmidi, subdevice,
301 SNDRV_RAWMIDI_STREAM_INPUT,
302 mode, &sinput);
303 if (err < 0)
304 return err;
305 }
306 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
307 err = assign_substream(rmidi, subdevice,
308 SNDRV_RAWMIDI_STREAM_OUTPUT,
309 mode, &soutput);
310 if (err < 0)
311 return err;
312 }
313
314 if (sinput) {
315 err = open_substream(rmidi, sinput, mode);
316 if (err < 0)
317 return err;
318 }
319 if (soutput) {
320 err = open_substream(rmidi, soutput, mode);
321 if (err < 0) {
322 if (sinput)
323 close_substream(rmidi, sinput, 0);
324 return err;
325 }
326 }
327
328 rfile->rmidi = rmidi;
329 rfile->input = sinput;
330 rfile->output = soutput;
331 return 0;
332 }
333
334 /* called from sound/core/seq/seq_midi.c */
335 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
336 int mode, struct snd_rawmidi_file * rfile)
337 {
338 struct snd_rawmidi *rmidi;
339 int err;
340
341 if (snd_BUG_ON(!rfile))
342 return -EINVAL;
343
344 mutex_lock(&register_mutex);
345 rmidi = snd_rawmidi_search(card, device);
346 if (rmidi == NULL) {
347 mutex_unlock(&register_mutex);
348 return -ENODEV;
349 }
350 if (!try_module_get(rmidi->card->module)) {
351 mutex_unlock(&register_mutex);
352 return -ENXIO;
353 }
354 mutex_unlock(&register_mutex);
355
356 mutex_lock(&rmidi->open_mutex);
357 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
358 mutex_unlock(&rmidi->open_mutex);
359 if (err < 0)
360 module_put(rmidi->card->module);
361 return err;
362 }
363
364 static int snd_rawmidi_open(struct inode *inode, struct file *file)
365 {
366 int maj = imajor(inode);
367 struct snd_card *card;
368 int subdevice;
369 unsigned short fflags;
370 int err;
371 struct snd_rawmidi *rmidi;
372 struct snd_rawmidi_file *rawmidi_file = NULL;
373 wait_queue_t wait;
374 struct snd_ctl_file *kctl;
375
376 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
377 return -EINVAL; /* invalid combination */
378
379 if (maj == snd_major) {
380 rmidi = snd_lookup_minor_data(iminor(inode),
381 SNDRV_DEVICE_TYPE_RAWMIDI);
382 #ifdef CONFIG_SND_OSSEMUL
383 } else if (maj == SOUND_MAJOR) {
384 rmidi = snd_lookup_oss_minor_data(iminor(inode),
385 SNDRV_OSS_DEVICE_TYPE_MIDI);
386 #endif
387 } else
388 return -ENXIO;
389
390 if (rmidi == NULL)
391 return -ENODEV;
392
393 if (!try_module_get(rmidi->card->module))
394 return -ENXIO;
395
396 mutex_lock(&rmidi->open_mutex);
397 card = rmidi->card;
398 err = snd_card_file_add(card, file);
399 if (err < 0)
400 goto __error_card;
401 fflags = snd_rawmidi_file_flags(file);
402 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
403 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
404 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
405 if (rawmidi_file == NULL) {
406 err = -ENOMEM;
407 goto __error;
408 }
409 init_waitqueue_entry(&wait, current);
410 add_wait_queue(&rmidi->open_wait, &wait);
411 while (1) {
412 subdevice = -1;
413 read_lock(&card->ctl_files_rwlock);
414 list_for_each_entry(kctl, &card->ctl_files, list) {
415 if (kctl->pid == task_pid(current)) {
416 subdevice = kctl->prefer_rawmidi_subdevice;
417 if (subdevice != -1)
418 break;
419 }
420 }
421 read_unlock(&card->ctl_files_rwlock);
422 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
423 if (err >= 0)
424 break;
425 if (err == -EAGAIN) {
426 if (file->f_flags & O_NONBLOCK) {
427 err = -EBUSY;
428 break;
429 }
430 } else
431 break;
432 set_current_state(TASK_INTERRUPTIBLE);
433 mutex_unlock(&rmidi->open_mutex);
434 schedule();
435 mutex_lock(&rmidi->open_mutex);
436 if (signal_pending(current)) {
437 err = -ERESTARTSYS;
438 break;
439 }
440 }
441 remove_wait_queue(&rmidi->open_wait, &wait);
442 if (err < 0) {
443 kfree(rawmidi_file);
444 goto __error;
445 }
446 #ifdef CONFIG_SND_OSSEMUL
447 if (rawmidi_file->input && rawmidi_file->input->runtime)
448 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
449 if (rawmidi_file->output && rawmidi_file->output->runtime)
450 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
451 #endif
452 file->private_data = rawmidi_file;
453 mutex_unlock(&rmidi->open_mutex);
454 return 0;
455
456 __error:
457 snd_card_file_remove(card, file);
458 __error_card:
459 mutex_unlock(&rmidi->open_mutex);
460 module_put(rmidi->card->module);
461 return err;
462 }
463
464 static void close_substream(struct snd_rawmidi *rmidi,
465 struct snd_rawmidi_substream *substream,
466 int cleanup)
467 {
468 if (--substream->use_count)
469 return;
470
471 if (cleanup) {
472 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
473 snd_rawmidi_input_trigger(substream, 0);
474 else {
475 if (substream->active_sensing) {
476 unsigned char buf = 0xfe;
477 /* sending single active sensing message
478 * to shut the device up
479 */
480 snd_rawmidi_kernel_write(substream, &buf, 1);
481 }
482 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
483 snd_rawmidi_output_trigger(substream, 0);
484 }
485 }
486 substream->ops->close(substream);
487 if (substream->runtime->private_free)
488 substream->runtime->private_free(substream);
489 snd_rawmidi_runtime_free(substream);
490 substream->opened = 0;
491 substream->append = 0;
492 put_pid(substream->pid);
493 substream->pid = NULL;
494 rmidi->streams[substream->stream].substream_opened--;
495 }
496
497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
498 {
499 struct snd_rawmidi *rmidi;
500
501 rmidi = rfile->rmidi;
502 mutex_lock(&rmidi->open_mutex);
503 if (rfile->input) {
504 close_substream(rmidi, rfile->input, 1);
505 rfile->input = NULL;
506 }
507 if (rfile->output) {
508 close_substream(rmidi, rfile->output, 1);
509 rfile->output = NULL;
510 }
511 rfile->rmidi = NULL;
512 mutex_unlock(&rmidi->open_mutex);
513 wake_up(&rmidi->open_wait);
514 }
515
516 /* called from sound/core/seq/seq_midi.c */
517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
518 {
519 struct snd_rawmidi *rmidi;
520
521 if (snd_BUG_ON(!rfile))
522 return -ENXIO;
523
524 rmidi = rfile->rmidi;
525 rawmidi_release_priv(rfile);
526 module_put(rmidi->card->module);
527 return 0;
528 }
529
530 static int snd_rawmidi_release(struct inode *inode, struct file *file)
531 {
532 struct snd_rawmidi_file *rfile;
533 struct snd_rawmidi *rmidi;
534
535 rfile = file->private_data;
536 rmidi = rfile->rmidi;
537 rawmidi_release_priv(rfile);
538 kfree(rfile);
539 snd_card_file_remove(rmidi->card, file);
540 module_put(rmidi->card->module);
541 return 0;
542 }
543
544 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
545 struct snd_rawmidi_info *info)
546 {
547 struct snd_rawmidi *rmidi;
548
549 if (substream == NULL)
550 return -ENODEV;
551 rmidi = substream->rmidi;
552 memset(info, 0, sizeof(*info));
553 info->card = rmidi->card->number;
554 info->device = rmidi->device;
555 info->subdevice = substream->number;
556 info->stream = substream->stream;
557 info->flags = rmidi->info_flags;
558 strcpy(info->id, rmidi->id);
559 strcpy(info->name, rmidi->name);
560 strcpy(info->subname, substream->name);
561 info->subdevices_count = substream->pstr->substream_count;
562 info->subdevices_avail = (substream->pstr->substream_count -
563 substream->pstr->substream_opened);
564 return 0;
565 }
566
567 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
568 struct snd_rawmidi_info __user * _info)
569 {
570 struct snd_rawmidi_info info;
571 int err;
572 if ((err = snd_rawmidi_info(substream, &info)) < 0)
573 return err;
574 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
575 return -EFAULT;
576 return 0;
577 }
578
579 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
580 {
581 struct snd_rawmidi *rmidi;
582 struct snd_rawmidi_str *pstr;
583 struct snd_rawmidi_substream *substream;
584
585 mutex_lock(&register_mutex);
586 rmidi = snd_rawmidi_search(card, info->device);
587 mutex_unlock(&register_mutex);
588 if (!rmidi)
589 return -ENXIO;
590 if (info->stream < 0 || info->stream > 1)
591 return -EINVAL;
592 pstr = &rmidi->streams[info->stream];
593 if (pstr->substream_count == 0)
594 return -ENOENT;
595 if (info->subdevice >= pstr->substream_count)
596 return -ENXIO;
597 list_for_each_entry(substream, &pstr->substreams, list) {
598 if ((unsigned int)substream->number == info->subdevice)
599 return snd_rawmidi_info(substream, info);
600 }
601 return -ENXIO;
602 }
603
604 static int snd_rawmidi_info_select_user(struct snd_card *card,
605 struct snd_rawmidi_info __user *_info)
606 {
607 int err;
608 struct snd_rawmidi_info info;
609 if (get_user(info.device, &_info->device))
610 return -EFAULT;
611 if (get_user(info.stream, &_info->stream))
612 return -EFAULT;
613 if (get_user(info.subdevice, &_info->subdevice))
614 return -EFAULT;
615 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
616 return err;
617 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
618 return -EFAULT;
619 return 0;
620 }
621
622 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
623 struct snd_rawmidi_params * params)
624 {
625 char *newbuf;
626 struct snd_rawmidi_runtime *runtime = substream->runtime;
627
628 if (substream->append && substream->use_count > 1)
629 return -EBUSY;
630 snd_rawmidi_drain_output(substream);
631 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
632 return -EINVAL;
633 }
634 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
635 return -EINVAL;
636 }
637 if (params->buffer_size != runtime->buffer_size) {
638 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
639 if (!newbuf)
640 return -ENOMEM;
641 kfree(runtime->buffer);
642 runtime->buffer = newbuf;
643 runtime->buffer_size = params->buffer_size;
644 runtime->avail = runtime->buffer_size;
645 }
646 runtime->avail_min = params->avail_min;
647 substream->active_sensing = !params->no_active_sensing;
648 return 0;
649 }
650
651 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
652 struct snd_rawmidi_params * params)
653 {
654 char *newbuf;
655 struct snd_rawmidi_runtime *runtime = substream->runtime;
656
657 snd_rawmidi_drain_input(substream);
658 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
659 return -EINVAL;
660 }
661 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
662 return -EINVAL;
663 }
664 if (params->buffer_size != runtime->buffer_size) {
665 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
666 if (!newbuf)
667 return -ENOMEM;
668 kfree(runtime->buffer);
669 runtime->buffer = newbuf;
670 runtime->buffer_size = params->buffer_size;
671 }
672 runtime->avail_min = params->avail_min;
673 return 0;
674 }
675
676 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
677 struct snd_rawmidi_status * status)
678 {
679 struct snd_rawmidi_runtime *runtime = substream->runtime;
680
681 memset(status, 0, sizeof(*status));
682 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
683 spin_lock_irq(&runtime->lock);
684 status->avail = runtime->avail;
685 spin_unlock_irq(&runtime->lock);
686 return 0;
687 }
688
689 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
690 struct snd_rawmidi_status * status)
691 {
692 struct snd_rawmidi_runtime *runtime = substream->runtime;
693
694 memset(status, 0, sizeof(*status));
695 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
696 spin_lock_irq(&runtime->lock);
697 status->avail = runtime->avail;
698 status->xruns = runtime->xruns;
699 runtime->xruns = 0;
700 spin_unlock_irq(&runtime->lock);
701 return 0;
702 }
703
704 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
705 {
706 struct snd_rawmidi_file *rfile;
707 void __user *argp = (void __user *)arg;
708
709 rfile = file->private_data;
710 if (((cmd >> 8) & 0xff) != 'W')
711 return -ENOTTY;
712 switch (cmd) {
713 case SNDRV_RAWMIDI_IOCTL_PVERSION:
714 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
715 case SNDRV_RAWMIDI_IOCTL_INFO:
716 {
717 int stream;
718 struct snd_rawmidi_info __user *info = argp;
719 if (get_user(stream, &info->stream))
720 return -EFAULT;
721 switch (stream) {
722 case SNDRV_RAWMIDI_STREAM_INPUT:
723 return snd_rawmidi_info_user(rfile->input, info);
724 case SNDRV_RAWMIDI_STREAM_OUTPUT:
725 return snd_rawmidi_info_user(rfile->output, info);
726 default:
727 return -EINVAL;
728 }
729 }
730 case SNDRV_RAWMIDI_IOCTL_PARAMS:
731 {
732 struct snd_rawmidi_params params;
733 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
734 return -EFAULT;
735 switch (params.stream) {
736 case SNDRV_RAWMIDI_STREAM_OUTPUT:
737 if (rfile->output == NULL)
738 return -EINVAL;
739 return snd_rawmidi_output_params(rfile->output, &params);
740 case SNDRV_RAWMIDI_STREAM_INPUT:
741 if (rfile->input == NULL)
742 return -EINVAL;
743 return snd_rawmidi_input_params(rfile->input, &params);
744 default:
745 return -EINVAL;
746 }
747 }
748 case SNDRV_RAWMIDI_IOCTL_STATUS:
749 {
750 int err = 0;
751 struct snd_rawmidi_status status;
752 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
753 return -EFAULT;
754 switch (status.stream) {
755 case SNDRV_RAWMIDI_STREAM_OUTPUT:
756 if (rfile->output == NULL)
757 return -EINVAL;
758 err = snd_rawmidi_output_status(rfile->output, &status);
759 break;
760 case SNDRV_RAWMIDI_STREAM_INPUT:
761 if (rfile->input == NULL)
762 return -EINVAL;
763 err = snd_rawmidi_input_status(rfile->input, &status);
764 break;
765 default:
766 return -EINVAL;
767 }
768 if (err < 0)
769 return err;
770 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
771 return -EFAULT;
772 return 0;
773 }
774 case SNDRV_RAWMIDI_IOCTL_DROP:
775 {
776 int val;
777 if (get_user(val, (int __user *) argp))
778 return -EFAULT;
779 switch (val) {
780 case SNDRV_RAWMIDI_STREAM_OUTPUT:
781 if (rfile->output == NULL)
782 return -EINVAL;
783 return snd_rawmidi_drop_output(rfile->output);
784 default:
785 return -EINVAL;
786 }
787 }
788 case SNDRV_RAWMIDI_IOCTL_DRAIN:
789 {
790 int val;
791 if (get_user(val, (int __user *) argp))
792 return -EFAULT;
793 switch (val) {
794 case SNDRV_RAWMIDI_STREAM_OUTPUT:
795 if (rfile->output == NULL)
796 return -EINVAL;
797 return snd_rawmidi_drain_output(rfile->output);
798 case SNDRV_RAWMIDI_STREAM_INPUT:
799 if (rfile->input == NULL)
800 return -EINVAL;
801 return snd_rawmidi_drain_input(rfile->input);
802 default:
803 return -EINVAL;
804 }
805 }
806 #ifdef CONFIG_SND_DEBUG
807 default:
808 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
809 #endif
810 }
811 return -ENOTTY;
812 }
813
814 static int snd_rawmidi_control_ioctl(struct snd_card *card,
815 struct snd_ctl_file *control,
816 unsigned int cmd,
817 unsigned long arg)
818 {
819 void __user *argp = (void __user *)arg;
820
821 switch (cmd) {
822 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
823 {
824 int device;
825
826 if (get_user(device, (int __user *)argp))
827 return -EFAULT;
828 mutex_lock(&register_mutex);
829 device = device < 0 ? 0 : device + 1;
830 while (device < SNDRV_RAWMIDI_DEVICES) {
831 if (snd_rawmidi_search(card, device))
832 break;
833 device++;
834 }
835 if (device == SNDRV_RAWMIDI_DEVICES)
836 device = -1;
837 mutex_unlock(&register_mutex);
838 if (put_user(device, (int __user *)argp))
839 return -EFAULT;
840 return 0;
841 }
842 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
843 {
844 int val;
845
846 if (get_user(val, (int __user *)argp))
847 return -EFAULT;
848 control->prefer_rawmidi_subdevice = val;
849 return 0;
850 }
851 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
852 return snd_rawmidi_info_select_user(card, argp);
853 }
854 return -ENOIOCTLCMD;
855 }
856
857 /**
858 * snd_rawmidi_receive - receive the input data from the device
859 * @substream: the rawmidi substream
860 * @buffer: the buffer pointer
861 * @count: the data size to read
862 *
863 * Reads the data from the internal buffer.
864 *
865 * Returns the size of read data, or a negative error code on failure.
866 */
867 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
868 const unsigned char *buffer, int count)
869 {
870 unsigned long flags;
871 int result = 0, count1;
872 struct snd_rawmidi_runtime *runtime = substream->runtime;
873
874 if (!substream->opened)
875 return -EBADFD;
876 if (runtime->buffer == NULL) {
877 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
878 return -EINVAL;
879 }
880 spin_lock_irqsave(&runtime->lock, flags);
881 if (count == 1) { /* special case, faster code */
882 substream->bytes++;
883 if (runtime->avail < runtime->buffer_size) {
884 runtime->buffer[runtime->hw_ptr++] = buffer[0];
885 runtime->hw_ptr %= runtime->buffer_size;
886 runtime->avail++;
887 result++;
888 } else {
889 runtime->xruns++;
890 }
891 } else {
892 substream->bytes += count;
893 count1 = runtime->buffer_size - runtime->hw_ptr;
894 if (count1 > count)
895 count1 = count;
896 if (count1 > (int)(runtime->buffer_size - runtime->avail))
897 count1 = runtime->buffer_size - runtime->avail;
898 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
899 runtime->hw_ptr += count1;
900 runtime->hw_ptr %= runtime->buffer_size;
901 runtime->avail += count1;
902 count -= count1;
903 result += count1;
904 if (count > 0) {
905 buffer += count1;
906 count1 = count;
907 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
908 count1 = runtime->buffer_size - runtime->avail;
909 runtime->xruns += count - count1;
910 }
911 if (count1 > 0) {
912 memcpy(runtime->buffer, buffer, count1);
913 runtime->hw_ptr = count1;
914 runtime->avail += count1;
915 result += count1;
916 }
917 }
918 }
919 if (result > 0) {
920 if (runtime->event)
921 tasklet_schedule(&runtime->tasklet);
922 else if (snd_rawmidi_ready(substream))
923 wake_up(&runtime->sleep);
924 }
925 spin_unlock_irqrestore(&runtime->lock, flags);
926 return result;
927 }
928
929 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
930 unsigned char __user *userbuf,
931 unsigned char *kernelbuf, long count)
932 {
933 unsigned long flags;
934 long result = 0, count1;
935 struct snd_rawmidi_runtime *runtime = substream->runtime;
936
937 while (count > 0 && runtime->avail) {
938 count1 = runtime->buffer_size - runtime->appl_ptr;
939 if (count1 > count)
940 count1 = count;
941 spin_lock_irqsave(&runtime->lock, flags);
942 if (count1 > (int)runtime->avail)
943 count1 = runtime->avail;
944 if (kernelbuf)
945 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
946 if (userbuf) {
947 spin_unlock_irqrestore(&runtime->lock, flags);
948 if (copy_to_user(userbuf + result,
949 runtime->buffer + runtime->appl_ptr, count1)) {
950 return result > 0 ? result : -EFAULT;
951 }
952 spin_lock_irqsave(&runtime->lock, flags);
953 }
954 runtime->appl_ptr += count1;
955 runtime->appl_ptr %= runtime->buffer_size;
956 runtime->avail -= count1;
957 spin_unlock_irqrestore(&runtime->lock, flags);
958 result += count1;
959 count -= count1;
960 }
961 return result;
962 }
963
964 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
965 unsigned char *buf, long count)
966 {
967 snd_rawmidi_input_trigger(substream, 1);
968 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
969 }
970
971 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
972 loff_t *offset)
973 {
974 long result;
975 int count1;
976 struct snd_rawmidi_file *rfile;
977 struct snd_rawmidi_substream *substream;
978 struct snd_rawmidi_runtime *runtime;
979
980 rfile = file->private_data;
981 substream = rfile->input;
982 if (substream == NULL)
983 return -EIO;
984 runtime = substream->runtime;
985 snd_rawmidi_input_trigger(substream, 1);
986 result = 0;
987 while (count > 0) {
988 spin_lock_irq(&runtime->lock);
989 while (!snd_rawmidi_ready(substream)) {
990 wait_queue_t wait;
991 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
992 spin_unlock_irq(&runtime->lock);
993 return result > 0 ? result : -EAGAIN;
994 }
995 init_waitqueue_entry(&wait, current);
996 add_wait_queue(&runtime->sleep, &wait);
997 set_current_state(TASK_INTERRUPTIBLE);
998 spin_unlock_irq(&runtime->lock);
999 schedule();
1000 remove_wait_queue(&runtime->sleep, &wait);
1001 if (signal_pending(current))
1002 return result > 0 ? result : -ERESTARTSYS;
1003 if (!runtime->avail)
1004 return result > 0 ? result : -EIO;
1005 spin_lock_irq(&runtime->lock);
1006 }
1007 spin_unlock_irq(&runtime->lock);
1008 count1 = snd_rawmidi_kernel_read1(substream,
1009 (unsigned char __user *)buf,
1010 NULL/*kernelbuf*/,
1011 count);
1012 if (count1 < 0)
1013 return result > 0 ? result : count1;
1014 result += count1;
1015 buf += count1;
1016 count -= count1;
1017 }
1018 return result;
1019 }
1020
1021 /**
1022 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1023 * @substream: the rawmidi substream
1024 *
1025 * Returns 1 if the internal output buffer is empty, 0 if not.
1026 */
1027 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1028 {
1029 struct snd_rawmidi_runtime *runtime = substream->runtime;
1030 int result;
1031 unsigned long flags;
1032
1033 if (runtime->buffer == NULL) {
1034 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1035 return 1;
1036 }
1037 spin_lock_irqsave(&runtime->lock, flags);
1038 result = runtime->avail >= runtime->buffer_size;
1039 spin_unlock_irqrestore(&runtime->lock, flags);
1040 return result;
1041 }
1042
1043 /**
1044 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1045 * @substream: the rawmidi substream
1046 * @buffer: the buffer pointer
1047 * @count: data size to transfer
1048 *
1049 * Copies data from the internal output buffer to the given buffer.
1050 *
1051 * Call this in the interrupt handler when the midi output is ready,
1052 * and call snd_rawmidi_transmit_ack() after the transmission is
1053 * finished.
1054 *
1055 * Returns the size of copied data, or a negative error code on failure.
1056 */
1057 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1058 unsigned char *buffer, int count)
1059 {
1060 unsigned long flags;
1061 int result, count1;
1062 struct snd_rawmidi_runtime *runtime = substream->runtime;
1063
1064 if (runtime->buffer == NULL) {
1065 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1066 return -EINVAL;
1067 }
1068 result = 0;
1069 spin_lock_irqsave(&runtime->lock, flags);
1070 if (runtime->avail >= runtime->buffer_size) {
1071 /* warning: lowlevel layer MUST trigger down the hardware */
1072 goto __skip;
1073 }
1074 if (count == 1) { /* special case, faster code */
1075 *buffer = runtime->buffer[runtime->hw_ptr];
1076 result++;
1077 } else {
1078 count1 = runtime->buffer_size - runtime->hw_ptr;
1079 if (count1 > count)
1080 count1 = count;
1081 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1082 count1 = runtime->buffer_size - runtime->avail;
1083 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1084 count -= count1;
1085 result += count1;
1086 if (count > 0) {
1087 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1088 count = runtime->buffer_size - runtime->avail - count1;
1089 memcpy(buffer + count1, runtime->buffer, count);
1090 result += count;
1091 }
1092 }
1093 __skip:
1094 spin_unlock_irqrestore(&runtime->lock, flags);
1095 return result;
1096 }
1097
1098 /**
1099 * snd_rawmidi_transmit_ack - acknowledge the transmission
1100 * @substream: the rawmidi substream
1101 * @count: the tranferred count
1102 *
1103 * Advances the hardware pointer for the internal output buffer with
1104 * the given size and updates the condition.
1105 * Call after the transmission is finished.
1106 *
1107 * Returns the advanced size if successful, or a negative error code on failure.
1108 */
1109 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1110 {
1111 unsigned long flags;
1112 struct snd_rawmidi_runtime *runtime = substream->runtime;
1113
1114 if (runtime->buffer == NULL) {
1115 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1116 return -EINVAL;
1117 }
1118 spin_lock_irqsave(&runtime->lock, flags);
1119 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1120 runtime->hw_ptr += count;
1121 runtime->hw_ptr %= runtime->buffer_size;
1122 runtime->avail += count;
1123 substream->bytes += count;
1124 if (count > 0) {
1125 if (runtime->drain || snd_rawmidi_ready(substream))
1126 wake_up(&runtime->sleep);
1127 }
1128 spin_unlock_irqrestore(&runtime->lock, flags);
1129 return count;
1130 }
1131
1132 /**
1133 * snd_rawmidi_transmit - copy from the buffer to the device
1134 * @substream: the rawmidi substream
1135 * @buffer: the buffer pointer
1136 * @count: the data size to transfer
1137 *
1138 * Copies data from the buffer to the device and advances the pointer.
1139 *
1140 * Returns the copied size if successful, or a negative error code on failure.
1141 */
1142 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1143 unsigned char *buffer, int count)
1144 {
1145 if (!substream->opened)
1146 return -EBADFD;
1147 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1148 if (count < 0)
1149 return count;
1150 return snd_rawmidi_transmit_ack(substream, count);
1151 }
1152
1153 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1154 const unsigned char __user *userbuf,
1155 const unsigned char *kernelbuf,
1156 long count)
1157 {
1158 unsigned long flags;
1159 long count1, result;
1160 struct snd_rawmidi_runtime *runtime = substream->runtime;
1161
1162 if (snd_BUG_ON(!kernelbuf && !userbuf))
1163 return -EINVAL;
1164 if (snd_BUG_ON(!runtime->buffer))
1165 return -EINVAL;
1166
1167 result = 0;
1168 spin_lock_irqsave(&runtime->lock, flags);
1169 if (substream->append) {
1170 if ((long)runtime->avail < count) {
1171 spin_unlock_irqrestore(&runtime->lock, flags);
1172 return -EAGAIN;
1173 }
1174 }
1175 while (count > 0 && runtime->avail > 0) {
1176 count1 = runtime->buffer_size - runtime->appl_ptr;
1177 if (count1 > count)
1178 count1 = count;
1179 if (count1 > (long)runtime->avail)
1180 count1 = runtime->avail;
1181 if (kernelbuf)
1182 memcpy(runtime->buffer + runtime->appl_ptr,
1183 kernelbuf + result, count1);
1184 else if (userbuf) {
1185 spin_unlock_irqrestore(&runtime->lock, flags);
1186 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1187 userbuf + result, count1)) {
1188 spin_lock_irqsave(&runtime->lock, flags);
1189 result = result > 0 ? result : -EFAULT;
1190 goto __end;
1191 }
1192 spin_lock_irqsave(&runtime->lock, flags);
1193 }
1194 runtime->appl_ptr += count1;
1195 runtime->appl_ptr %= runtime->buffer_size;
1196 runtime->avail -= count1;
1197 result += count1;
1198 count -= count1;
1199 }
1200 __end:
1201 count1 = runtime->avail < runtime->buffer_size;
1202 spin_unlock_irqrestore(&runtime->lock, flags);
1203 if (count1)
1204 snd_rawmidi_output_trigger(substream, 1);
1205 return result;
1206 }
1207
1208 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1209 const unsigned char *buf, long count)
1210 {
1211 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1212 }
1213
1214 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1215 size_t count, loff_t *offset)
1216 {
1217 long result, timeout;
1218 int count1;
1219 struct snd_rawmidi_file *rfile;
1220 struct snd_rawmidi_runtime *runtime;
1221 struct snd_rawmidi_substream *substream;
1222
1223 rfile = file->private_data;
1224 substream = rfile->output;
1225 runtime = substream->runtime;
1226 /* we cannot put an atomic message to our buffer */
1227 if (substream->append && count > runtime->buffer_size)
1228 return -EIO;
1229 result = 0;
1230 while (count > 0) {
1231 spin_lock_irq(&runtime->lock);
1232 while (!snd_rawmidi_ready_append(substream, count)) {
1233 wait_queue_t wait;
1234 if (file->f_flags & O_NONBLOCK) {
1235 spin_unlock_irq(&runtime->lock);
1236 return result > 0 ? result : -EAGAIN;
1237 }
1238 init_waitqueue_entry(&wait, current);
1239 add_wait_queue(&runtime->sleep, &wait);
1240 set_current_state(TASK_INTERRUPTIBLE);
1241 spin_unlock_irq(&runtime->lock);
1242 timeout = schedule_timeout(30 * HZ);
1243 remove_wait_queue(&runtime->sleep, &wait);
1244 if (signal_pending(current))
1245 return result > 0 ? result : -ERESTARTSYS;
1246 if (!runtime->avail && !timeout)
1247 return result > 0 ? result : -EIO;
1248 spin_lock_irq(&runtime->lock);
1249 }
1250 spin_unlock_irq(&runtime->lock);
1251 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1252 if (count1 < 0)
1253 return result > 0 ? result : count1;
1254 result += count1;
1255 buf += count1;
1256 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1257 break;
1258 count -= count1;
1259 }
1260 if (file->f_flags & O_DSYNC) {
1261 spin_lock_irq(&runtime->lock);
1262 while (runtime->avail != runtime->buffer_size) {
1263 wait_queue_t wait;
1264 unsigned int last_avail = runtime->avail;
1265 init_waitqueue_entry(&wait, current);
1266 add_wait_queue(&runtime->sleep, &wait);
1267 set_current_state(TASK_INTERRUPTIBLE);
1268 spin_unlock_irq(&runtime->lock);
1269 timeout = schedule_timeout(30 * HZ);
1270 remove_wait_queue(&runtime->sleep, &wait);
1271 if (signal_pending(current))
1272 return result > 0 ? result : -ERESTARTSYS;
1273 if (runtime->avail == last_avail && !timeout)
1274 return result > 0 ? result : -EIO;
1275 spin_lock_irq(&runtime->lock);
1276 }
1277 spin_unlock_irq(&runtime->lock);
1278 }
1279 return result;
1280 }
1281
1282 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1283 {
1284 struct snd_rawmidi_file *rfile;
1285 struct snd_rawmidi_runtime *runtime;
1286 unsigned int mask;
1287
1288 rfile = file->private_data;
1289 if (rfile->input != NULL) {
1290 runtime = rfile->input->runtime;
1291 snd_rawmidi_input_trigger(rfile->input, 1);
1292 poll_wait(file, &runtime->sleep, wait);
1293 }
1294 if (rfile->output != NULL) {
1295 runtime = rfile->output->runtime;
1296 poll_wait(file, &runtime->sleep, wait);
1297 }
1298 mask = 0;
1299 if (rfile->input != NULL) {
1300 if (snd_rawmidi_ready(rfile->input))
1301 mask |= POLLIN | POLLRDNORM;
1302 }
1303 if (rfile->output != NULL) {
1304 if (snd_rawmidi_ready(rfile->output))
1305 mask |= POLLOUT | POLLWRNORM;
1306 }
1307 return mask;
1308 }
1309
1310 /*
1311 */
1312 #ifdef CONFIG_COMPAT
1313 #include "rawmidi_compat.c"
1314 #else
1315 #define snd_rawmidi_ioctl_compat NULL
1316 #endif
1317
1318 /*
1319
1320 */
1321
1322 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1323 struct snd_info_buffer *buffer)
1324 {
1325 struct snd_rawmidi *rmidi;
1326 struct snd_rawmidi_substream *substream;
1327 struct snd_rawmidi_runtime *runtime;
1328
1329 rmidi = entry->private_data;
1330 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1331 mutex_lock(&rmidi->open_mutex);
1332 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1333 list_for_each_entry(substream,
1334 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1335 list) {
1336 snd_iprintf(buffer,
1337 "Output %d\n"
1338 " Tx bytes : %lu\n",
1339 substream->number,
1340 (unsigned long) substream->bytes);
1341 if (substream->opened) {
1342 snd_iprintf(buffer,
1343 " Owner PID : %d\n",
1344 pid_vnr(substream->pid));
1345 runtime = substream->runtime;
1346 snd_iprintf(buffer,
1347 " Mode : %s\n"
1348 " Buffer size : %lu\n"
1349 " Avail : %lu\n",
1350 runtime->oss ? "OSS compatible" : "native",
1351 (unsigned long) runtime->buffer_size,
1352 (unsigned long) runtime->avail);
1353 }
1354 }
1355 }
1356 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1357 list_for_each_entry(substream,
1358 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1359 list) {
1360 snd_iprintf(buffer,
1361 "Input %d\n"
1362 " Rx bytes : %lu\n",
1363 substream->number,
1364 (unsigned long) substream->bytes);
1365 if (substream->opened) {
1366 snd_iprintf(buffer,
1367 " Owner PID : %d\n",
1368 pid_vnr(substream->pid));
1369 runtime = substream->runtime;
1370 snd_iprintf(buffer,
1371 " Buffer size : %lu\n"
1372 " Avail : %lu\n"
1373 " Overruns : %lu\n",
1374 (unsigned long) runtime->buffer_size,
1375 (unsigned long) runtime->avail,
1376 (unsigned long) runtime->xruns);
1377 }
1378 }
1379 }
1380 mutex_unlock(&rmidi->open_mutex);
1381 }
1382
1383 /*
1384 * Register functions
1385 */
1386
1387 static const struct file_operations snd_rawmidi_f_ops =
1388 {
1389 .owner = THIS_MODULE,
1390 .read = snd_rawmidi_read,
1391 .write = snd_rawmidi_write,
1392 .open = snd_rawmidi_open,
1393 .release = snd_rawmidi_release,
1394 .poll = snd_rawmidi_poll,
1395 .unlocked_ioctl = snd_rawmidi_ioctl,
1396 .compat_ioctl = snd_rawmidi_ioctl_compat,
1397 };
1398
1399 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1400 struct snd_rawmidi_str *stream,
1401 int direction,
1402 int count)
1403 {
1404 struct snd_rawmidi_substream *substream;
1405 int idx;
1406
1407 for (idx = 0; idx < count; idx++) {
1408 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1409 if (substream == NULL) {
1410 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1411 return -ENOMEM;
1412 }
1413 substream->stream = direction;
1414 substream->number = idx;
1415 substream->rmidi = rmidi;
1416 substream->pstr = stream;
1417 list_add_tail(&substream->list, &stream->substreams);
1418 stream->substream_count++;
1419 }
1420 return 0;
1421 }
1422
1423 /**
1424 * snd_rawmidi_new - create a rawmidi instance
1425 * @card: the card instance
1426 * @id: the id string
1427 * @device: the device index
1428 * @output_count: the number of output streams
1429 * @input_count: the number of input streams
1430 * @rrawmidi: the pointer to store the new rawmidi instance
1431 *
1432 * Creates a new rawmidi instance.
1433 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1434 *
1435 * Returns zero if successful, or a negative error code on failure.
1436 */
1437 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1438 int output_count, int input_count,
1439 struct snd_rawmidi ** rrawmidi)
1440 {
1441 struct snd_rawmidi *rmidi;
1442 int err;
1443 static struct snd_device_ops ops = {
1444 .dev_free = snd_rawmidi_dev_free,
1445 .dev_register = snd_rawmidi_dev_register,
1446 .dev_disconnect = snd_rawmidi_dev_disconnect,
1447 };
1448
1449 if (snd_BUG_ON(!card))
1450 return -ENXIO;
1451 if (rrawmidi)
1452 *rrawmidi = NULL;
1453 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1454 if (rmidi == NULL) {
1455 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1456 return -ENOMEM;
1457 }
1458 rmidi->card = card;
1459 rmidi->device = device;
1460 mutex_init(&rmidi->open_mutex);
1461 init_waitqueue_head(&rmidi->open_wait);
1462 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1463 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1464
1465 if (id != NULL)
1466 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1467 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1468 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1469 SNDRV_RAWMIDI_STREAM_INPUT,
1470 input_count)) < 0) {
1471 snd_rawmidi_free(rmidi);
1472 return err;
1473 }
1474 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1475 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1476 SNDRV_RAWMIDI_STREAM_OUTPUT,
1477 output_count)) < 0) {
1478 snd_rawmidi_free(rmidi);
1479 return err;
1480 }
1481 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1482 snd_rawmidi_free(rmidi);
1483 return err;
1484 }
1485 if (rrawmidi)
1486 *rrawmidi = rmidi;
1487 return 0;
1488 }
1489
1490 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1491 {
1492 struct snd_rawmidi_substream *substream;
1493
1494 while (!list_empty(&stream->substreams)) {
1495 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1496 list_del(&substream->list);
1497 kfree(substream);
1498 }
1499 }
1500
1501 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1502 {
1503 if (!rmidi)
1504 return 0;
1505
1506 snd_info_free_entry(rmidi->proc_entry);
1507 rmidi->proc_entry = NULL;
1508 mutex_lock(&register_mutex);
1509 if (rmidi->ops && rmidi->ops->dev_unregister)
1510 rmidi->ops->dev_unregister(rmidi);
1511 mutex_unlock(&register_mutex);
1512
1513 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1514 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1515 if (rmidi->private_free)
1516 rmidi->private_free(rmidi);
1517 kfree(rmidi);
1518 return 0;
1519 }
1520
1521 static int snd_rawmidi_dev_free(struct snd_device *device)
1522 {
1523 struct snd_rawmidi *rmidi = device->device_data;
1524 return snd_rawmidi_free(rmidi);
1525 }
1526
1527 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1528 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1529 {
1530 struct snd_rawmidi *rmidi = device->private_data;
1531 rmidi->seq_dev = NULL;
1532 }
1533 #endif
1534
1535 static int snd_rawmidi_dev_register(struct snd_device *device)
1536 {
1537 int err;
1538 struct snd_info_entry *entry;
1539 char name[16];
1540 struct snd_rawmidi *rmidi = device->device_data;
1541
1542 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1543 return -ENOMEM;
1544 mutex_lock(&register_mutex);
1545 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1546 mutex_unlock(&register_mutex);
1547 return -EBUSY;
1548 }
1549 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1550 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1551 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1552 rmidi->card, rmidi->device,
1553 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1554 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1555 list_del(&rmidi->list);
1556 mutex_unlock(&register_mutex);
1557 return err;
1558 }
1559 if (rmidi->ops && rmidi->ops->dev_register &&
1560 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1561 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1562 list_del(&rmidi->list);
1563 mutex_unlock(&register_mutex);
1564 return err;
1565 }
1566 #ifdef CONFIG_SND_OSSEMUL
1567 rmidi->ossreg = 0;
1568 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1569 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1570 rmidi->card, 0, &snd_rawmidi_f_ops,
1571 rmidi, name) < 0) {
1572 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1573 } else {
1574 rmidi->ossreg++;
1575 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1576 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1577 #endif
1578 }
1579 }
1580 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1581 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1582 rmidi->card, 1, &snd_rawmidi_f_ops,
1583 rmidi, name) < 0) {
1584 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1585 } else {
1586 rmidi->ossreg++;
1587 }
1588 }
1589 #endif /* CONFIG_SND_OSSEMUL */
1590 mutex_unlock(&register_mutex);
1591 sprintf(name, "midi%d", rmidi->device);
1592 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1593 if (entry) {
1594 entry->private_data = rmidi;
1595 entry->c.text.read = snd_rawmidi_proc_info_read;
1596 if (snd_info_register(entry) < 0) {
1597 snd_info_free_entry(entry);
1598 entry = NULL;
1599 }
1600 }
1601 rmidi->proc_entry = entry;
1602 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1603 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1604 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1605 rmidi->seq_dev->private_data = rmidi;
1606 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1607 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1608 snd_device_register(rmidi->card, rmidi->seq_dev);
1609 }
1610 }
1611 #endif
1612 return 0;
1613 }
1614
1615 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1616 {
1617 struct snd_rawmidi *rmidi = device->device_data;
1618
1619 mutex_lock(&register_mutex);
1620 list_del_init(&rmidi->list);
1621 #ifdef CONFIG_SND_OSSEMUL
1622 if (rmidi->ossreg) {
1623 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1624 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1625 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1626 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1627 #endif
1628 }
1629 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1630 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1631 rmidi->ossreg = 0;
1632 }
1633 #endif /* CONFIG_SND_OSSEMUL */
1634 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1635 mutex_unlock(&register_mutex);
1636 return 0;
1637 }
1638
1639 /**
1640 * snd_rawmidi_set_ops - set the rawmidi operators
1641 * @rmidi: the rawmidi instance
1642 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1643 * @ops: the operator table
1644 *
1645 * Sets the rawmidi operators for the given stream direction.
1646 */
1647 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1648 struct snd_rawmidi_ops *ops)
1649 {
1650 struct snd_rawmidi_substream *substream;
1651
1652 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1653 substream->ops = ops;
1654 }
1655
1656 /*
1657 * ENTRY functions
1658 */
1659
1660 static int __init alsa_rawmidi_init(void)
1661 {
1662
1663 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1664 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1665 #ifdef CONFIG_SND_OSSEMUL
1666 { int i;
1667 /* check device map table */
1668 for (i = 0; i < SNDRV_CARDS; i++) {
1669 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1670 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1671 midi_map[i] = 0;
1672 }
1673 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1674 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1675 amidi_map[i] = 1;
1676 }
1677 }
1678 }
1679 #endif /* CONFIG_SND_OSSEMUL */
1680 return 0;
1681 }
1682
1683 static void __exit alsa_rawmidi_exit(void)
1684 {
1685 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1686 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1687 }
1688
1689 module_init(alsa_rawmidi_init)
1690 module_exit(alsa_rawmidi_exit)
1691
1692 EXPORT_SYMBOL(snd_rawmidi_output_params);
1693 EXPORT_SYMBOL(snd_rawmidi_input_params);
1694 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1695 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1696 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1697 EXPORT_SYMBOL(snd_rawmidi_receive);
1698 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1699 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1700 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1701 EXPORT_SYMBOL(snd_rawmidi_transmit);
1702 EXPORT_SYMBOL(snd_rawmidi_new);
1703 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1704 EXPORT_SYMBOL(snd_rawmidi_info_select);
1705 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1706 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1707 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1708 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
Mirror of NV Tegra kernel