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tmpfs: support fallocate FALLOC_FL_PUNCH_HOLE
[linux-2.6/libata-dev.git] / sound / core / rawmidi.c
blobebf6e49ad3d461ba843131d903b0c66cc7840ba4
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/module.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_work(struct work_struct *work)
96 {
97 struct snd_rawmidi_runtime *runtime =
98 container_of(work, struct snd_rawmidi_runtime, event_work);
99 if (runtime->event)
100 runtime->event(runtime->substream);
101 }
102
103 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
104 {
105 struct snd_rawmidi_runtime *runtime;
106
107 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
108 return -ENOMEM;
109 runtime->substream = substream;
110 spin_lock_init(&runtime->lock);
111 init_waitqueue_head(&runtime->sleep);
112 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
113 runtime->event = NULL;
114 runtime->buffer_size = PAGE_SIZE;
115 runtime->avail_min = 1;
116 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
117 runtime->avail = 0;
118 else
119 runtime->avail = runtime->buffer_size;
120 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
121 kfree(runtime);
122 return -ENOMEM;
123 }
124 runtime->appl_ptr = runtime->hw_ptr = 0;
125 substream->runtime = runtime;
126 return 0;
127 }
128
129 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
130 {
131 struct snd_rawmidi_runtime *runtime = substream->runtime;
132
133 kfree(runtime->buffer);
134 kfree(runtime);
135 substream->runtime = NULL;
136 return 0;
137 }
138
139 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
140 {
141 if (!substream->opened)
142 return;
143 substream->ops->trigger(substream, up);
144 }
145
146 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
147 {
148 if (!substream->opened)
149 return;
150 substream->ops->trigger(substream, up);
151 if (!up)
152 cancel_work_sync(&substream->runtime->event_work);
153 }
154
155 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
156 {
157 unsigned long flags;
158 struct snd_rawmidi_runtime *runtime = substream->runtime;
159
160 snd_rawmidi_output_trigger(substream, 0);
161 runtime->drain = 0;
162 spin_lock_irqsave(&runtime->lock, flags);
163 runtime->appl_ptr = runtime->hw_ptr = 0;
164 runtime->avail = runtime->buffer_size;
165 spin_unlock_irqrestore(&runtime->lock, flags);
166 return 0;
167 }
168
169 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
170 {
171 int err;
172 long timeout;
173 struct snd_rawmidi_runtime *runtime = substream->runtime;
174
175 err = 0;
176 runtime->drain = 1;
177 timeout = wait_event_interruptible_timeout(runtime->sleep,
178 (runtime->avail >= runtime->buffer_size),
179 10*HZ);
180 if (signal_pending(current))
181 err = -ERESTARTSYS;
182 if (runtime->avail < runtime->buffer_size && !timeout) {
183 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
184 err = -EIO;
185 }
186 runtime->drain = 0;
187 if (err != -ERESTARTSYS) {
188 /* we need wait a while to make sure that Tx FIFOs are empty */
189 if (substream->ops->drain)
190 substream->ops->drain(substream);
191 else
192 msleep(50);
193 snd_rawmidi_drop_output(substream);
194 }
195 return err;
196 }
197
198 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
199 {
200 unsigned long flags;
201 struct snd_rawmidi_runtime *runtime = substream->runtime;
202
203 snd_rawmidi_input_trigger(substream, 0);
204 runtime->drain = 0;
205 spin_lock_irqsave(&runtime->lock, flags);
206 runtime->appl_ptr = runtime->hw_ptr = 0;
207 runtime->avail = 0;
208 spin_unlock_irqrestore(&runtime->lock, flags);
209 return 0;
210 }
211
212 /* look for an available substream for the given stream direction;
213 * if a specific subdevice is given, try to assign it
214 */
215 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
216 int stream, int mode,
217 struct snd_rawmidi_substream **sub_ret)
218 {
219 struct snd_rawmidi_substream *substream;
220 struct snd_rawmidi_str *s = &rmidi->streams[stream];
221 static unsigned int info_flags[2] = {
222 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
223 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
224 };
225
226 if (!(rmidi->info_flags & info_flags[stream]))
227 return -ENXIO;
228 if (subdevice >= 0 && subdevice >= s->substream_count)
229 return -ENODEV;
230
231 list_for_each_entry(substream, &s->substreams, list) {
232 if (substream->opened) {
233 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
234 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
235 !substream->append)
236 continue;
237 }
238 if (subdevice < 0 || subdevice == substream->number) {
239 *sub_ret = substream;
240 return 0;
241 }
242 }
243 return -EAGAIN;
244 }
245
246 /* open and do ref-counting for the given substream */
247 static int open_substream(struct snd_rawmidi *rmidi,
248 struct snd_rawmidi_substream *substream,
249 int mode)
250 {
251 int err;
252
253 if (substream->use_count == 0) {
254 err = snd_rawmidi_runtime_create(substream);
255 if (err < 0)
256 return err;
257 err = substream->ops->open(substream);
258 if (err < 0) {
259 snd_rawmidi_runtime_free(substream);
260 return err;
261 }
262 substream->opened = 1;
263 substream->active_sensing = 0;
264 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
265 substream->append = 1;
266 substream->pid = get_pid(task_pid(current));
267 rmidi->streams[substream->stream].substream_opened++;
268 }
269 substream->use_count++;
270 return 0;
271 }
272
273 static void close_substream(struct snd_rawmidi *rmidi,
274 struct snd_rawmidi_substream *substream,
275 int cleanup);
276
277 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
278 struct snd_rawmidi_file *rfile)
279 {
280 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
281 int err;
282
283 rfile->input = rfile->output = NULL;
284 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
285 err = assign_substream(rmidi, subdevice,
286 SNDRV_RAWMIDI_STREAM_INPUT,
287 mode, &sinput);
288 if (err < 0)
289 return err;
290 }
291 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
292 err = assign_substream(rmidi, subdevice,
293 SNDRV_RAWMIDI_STREAM_OUTPUT,
294 mode, &soutput);
295 if (err < 0)
296 return err;
297 }
298
299 if (sinput) {
300 err = open_substream(rmidi, sinput, mode);
301 if (err < 0)
302 return err;
303 }
304 if (soutput) {
305 err = open_substream(rmidi, soutput, mode);
306 if (err < 0) {
307 if (sinput)
308 close_substream(rmidi, sinput, 0);
309 return err;
310 }
311 }
312
313 rfile->rmidi = rmidi;
314 rfile->input = sinput;
315 rfile->output = soutput;
316 return 0;
317 }
318
319 /* called from sound/core/seq/seq_midi.c */
320 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
321 int mode, struct snd_rawmidi_file * rfile)
322 {
323 struct snd_rawmidi *rmidi;
324 int err;
325
326 if (snd_BUG_ON(!rfile))
327 return -EINVAL;
328
329 mutex_lock(&register_mutex);
330 rmidi = snd_rawmidi_search(card, device);
331 if (rmidi == NULL) {
332 mutex_unlock(&register_mutex);
333 return -ENODEV;
334 }
335 if (!try_module_get(rmidi->card->module)) {
336 mutex_unlock(&register_mutex);
337 return -ENXIO;
338 }
339 mutex_unlock(&register_mutex);
340
341 mutex_lock(&rmidi->open_mutex);
342 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
343 mutex_unlock(&rmidi->open_mutex);
344 if (err < 0)
345 module_put(rmidi->card->module);
346 return err;
347 }
348
349 static int snd_rawmidi_open(struct inode *inode, struct file *file)
350 {
351 int maj = imajor(inode);
352 struct snd_card *card;
353 int subdevice;
354 unsigned short fflags;
355 int err;
356 struct snd_rawmidi *rmidi;
357 struct snd_rawmidi_file *rawmidi_file = NULL;
358 wait_queue_t wait;
359 struct snd_ctl_file *kctl;
360
361 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
362 return -EINVAL; /* invalid combination */
363
364 err = nonseekable_open(inode, file);
365 if (err < 0)
366 return err;
367
368 if (maj == snd_major) {
369 rmidi = snd_lookup_minor_data(iminor(inode),
370 SNDRV_DEVICE_TYPE_RAWMIDI);
371 #ifdef CONFIG_SND_OSSEMUL
372 } else if (maj == SOUND_MAJOR) {
373 rmidi = snd_lookup_oss_minor_data(iminor(inode),
374 SNDRV_OSS_DEVICE_TYPE_MIDI);
375 #endif
376 } else
377 return -ENXIO;
378
379 if (rmidi == NULL)
380 return -ENODEV;
381
382 if (!try_module_get(rmidi->card->module))
383 return -ENXIO;
384
385 mutex_lock(&rmidi->open_mutex);
386 card = rmidi->card;
387 err = snd_card_file_add(card, file);
388 if (err < 0)
389 goto __error_card;
390 fflags = snd_rawmidi_file_flags(file);
391 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
392 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
393 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
394 if (rawmidi_file == NULL) {
395 err = -ENOMEM;
396 goto __error;
397 }
398 init_waitqueue_entry(&wait, current);
399 add_wait_queue(&rmidi->open_wait, &wait);
400 while (1) {
401 subdevice = -1;
402 read_lock(&card->ctl_files_rwlock);
403 list_for_each_entry(kctl, &card->ctl_files, list) {
404 if (kctl->pid == task_pid(current)) {
405 subdevice = kctl->prefer_rawmidi_subdevice;
406 if (subdevice != -1)
407 break;
408 }
409 }
410 read_unlock(&card->ctl_files_rwlock);
411 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
412 if (err >= 0)
413 break;
414 if (err == -EAGAIN) {
415 if (file->f_flags & O_NONBLOCK) {
416 err = -EBUSY;
417 break;
418 }
419 } else
420 break;
421 set_current_state(TASK_INTERRUPTIBLE);
422 mutex_unlock(&rmidi->open_mutex);
423 schedule();
424 mutex_lock(&rmidi->open_mutex);
425 if (signal_pending(current)) {
426 err = -ERESTARTSYS;
427 break;
428 }
429 }
430 remove_wait_queue(&rmidi->open_wait, &wait);
431 if (err < 0) {
432 kfree(rawmidi_file);
433 goto __error;
434 }
435 #ifdef CONFIG_SND_OSSEMUL
436 if (rawmidi_file->input && rawmidi_file->input->runtime)
437 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
438 if (rawmidi_file->output && rawmidi_file->output->runtime)
439 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
440 #endif
441 file->private_data = rawmidi_file;
442 mutex_unlock(&rmidi->open_mutex);
443 return 0;
444
445 __error:
446 snd_card_file_remove(card, file);
447 __error_card:
448 mutex_unlock(&rmidi->open_mutex);
449 module_put(rmidi->card->module);
450 return err;
451 }
452
453 static void close_substream(struct snd_rawmidi *rmidi,
454 struct snd_rawmidi_substream *substream,
455 int cleanup)
456 {
457 if (--substream->use_count)
458 return;
459
460 if (cleanup) {
461 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
462 snd_rawmidi_input_trigger(substream, 0);
463 else {
464 if (substream->active_sensing) {
465 unsigned char buf = 0xfe;
466 /* sending single active sensing message
467 * to shut the device up
468 */
469 snd_rawmidi_kernel_write(substream, &buf, 1);
470 }
471 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
472 snd_rawmidi_output_trigger(substream, 0);
473 }
474 }
475 substream->ops->close(substream);
476 if (substream->runtime->private_free)
477 substream->runtime->private_free(substream);
478 snd_rawmidi_runtime_free(substream);
479 substream->opened = 0;
480 substream->append = 0;
481 put_pid(substream->pid);
482 substream->pid = NULL;
483 rmidi->streams[substream->stream].substream_opened--;
484 }
485
486 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
487 {
488 struct snd_rawmidi *rmidi;
489
490 rmidi = rfile->rmidi;
491 mutex_lock(&rmidi->open_mutex);
492 if (rfile->input) {
493 close_substream(rmidi, rfile->input, 1);
494 rfile->input = NULL;
495 }
496 if (rfile->output) {
497 close_substream(rmidi, rfile->output, 1);
498 rfile->output = NULL;
499 }
500 rfile->rmidi = NULL;
501 mutex_unlock(&rmidi->open_mutex);
502 wake_up(&rmidi->open_wait);
503 }
504
505 /* called from sound/core/seq/seq_midi.c */
506 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
507 {
508 struct snd_rawmidi *rmidi;
509
510 if (snd_BUG_ON(!rfile))
511 return -ENXIO;
512
513 rmidi = rfile->rmidi;
514 rawmidi_release_priv(rfile);
515 module_put(rmidi->card->module);
516 return 0;
517 }
518
519 static int snd_rawmidi_release(struct inode *inode, struct file *file)
520 {
521 struct snd_rawmidi_file *rfile;
522 struct snd_rawmidi *rmidi;
523 struct module *module;
524
525 rfile = file->private_data;
526 rmidi = rfile->rmidi;
527 rawmidi_release_priv(rfile);
528 kfree(rfile);
529 module = rmidi->card->module;
530 snd_card_file_remove(rmidi->card, file);
531 module_put(module);
532 return 0;
533 }
534
535 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
536 struct snd_rawmidi_info *info)
537 {
538 struct snd_rawmidi *rmidi;
539
540 if (substream == NULL)
541 return -ENODEV;
542 rmidi = substream->rmidi;
543 memset(info, 0, sizeof(*info));
544 info->card = rmidi->card->number;
545 info->device = rmidi->device;
546 info->subdevice = substream->number;
547 info->stream = substream->stream;
548 info->flags = rmidi->info_flags;
549 strcpy(info->id, rmidi->id);
550 strcpy(info->name, rmidi->name);
551 strcpy(info->subname, substream->name);
552 info->subdevices_count = substream->pstr->substream_count;
553 info->subdevices_avail = (substream->pstr->substream_count -
554 substream->pstr->substream_opened);
555 return 0;
556 }
557
558 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
559 struct snd_rawmidi_info __user * _info)
560 {
561 struct snd_rawmidi_info info;
562 int err;
563 if ((err = snd_rawmidi_info(substream, &info)) < 0)
564 return err;
565 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
566 return -EFAULT;
567 return 0;
568 }
569
570 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
571 {
572 struct snd_rawmidi *rmidi;
573 struct snd_rawmidi_str *pstr;
574 struct snd_rawmidi_substream *substream;
575
576 mutex_lock(&register_mutex);
577 rmidi = snd_rawmidi_search(card, info->device);
578 mutex_unlock(&register_mutex);
579 if (!rmidi)
580 return -ENXIO;
581 if (info->stream < 0 || info->stream > 1)
582 return -EINVAL;
583 pstr = &rmidi->streams[info->stream];
584 if (pstr->substream_count == 0)
585 return -ENOENT;
586 if (info->subdevice >= pstr->substream_count)
587 return -ENXIO;
588 list_for_each_entry(substream, &pstr->substreams, list) {
589 if ((unsigned int)substream->number == info->subdevice)
590 return snd_rawmidi_info(substream, info);
591 }
592 return -ENXIO;
593 }
594
595 static int snd_rawmidi_info_select_user(struct snd_card *card,
596 struct snd_rawmidi_info __user *_info)
597 {
598 int err;
599 struct snd_rawmidi_info info;
600 if (get_user(info.device, &_info->device))
601 return -EFAULT;
602 if (get_user(info.stream, &_info->stream))
603 return -EFAULT;
604 if (get_user(info.subdevice, &_info->subdevice))
605 return -EFAULT;
606 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
607 return err;
608 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
609 return -EFAULT;
610 return 0;
611 }
612
613 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
614 struct snd_rawmidi_params * params)
615 {
616 char *newbuf;
617 struct snd_rawmidi_runtime *runtime = substream->runtime;
618
619 if (substream->append && substream->use_count > 1)
620 return -EBUSY;
621 snd_rawmidi_drain_output(substream);
622 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
623 return -EINVAL;
624 }
625 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
626 return -EINVAL;
627 }
628 if (params->buffer_size != runtime->buffer_size) {
629 newbuf = krealloc(runtime->buffer, params->buffer_size,
630 GFP_KERNEL);
631 if (!newbuf)
632 return -ENOMEM;
633 runtime->buffer = newbuf;
634 runtime->buffer_size = params->buffer_size;
635 runtime->avail = runtime->buffer_size;
636 }
637 runtime->avail_min = params->avail_min;
638 substream->active_sensing = !params->no_active_sensing;
639 return 0;
640 }
641
642 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
643 struct snd_rawmidi_params * params)
644 {
645 char *newbuf;
646 struct snd_rawmidi_runtime *runtime = substream->runtime;
647
648 snd_rawmidi_drain_input(substream);
649 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
650 return -EINVAL;
651 }
652 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
653 return -EINVAL;
654 }
655 if (params->buffer_size != runtime->buffer_size) {
656 newbuf = krealloc(runtime->buffer, params->buffer_size,
657 GFP_KERNEL);
658 if (!newbuf)
659 return -ENOMEM;
660 runtime->buffer = newbuf;
661 runtime->buffer_size = params->buffer_size;
662 }
663 runtime->avail_min = params->avail_min;
664 return 0;
665 }
666
667 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
668 struct snd_rawmidi_status * status)
669 {
670 struct snd_rawmidi_runtime *runtime = substream->runtime;
671
672 memset(status, 0, sizeof(*status));
673 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
674 spin_lock_irq(&runtime->lock);
675 status->avail = runtime->avail;
676 spin_unlock_irq(&runtime->lock);
677 return 0;
678 }
679
680 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
681 struct snd_rawmidi_status * status)
682 {
683 struct snd_rawmidi_runtime *runtime = substream->runtime;
684
685 memset(status, 0, sizeof(*status));
686 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
687 spin_lock_irq(&runtime->lock);
688 status->avail = runtime->avail;
689 status->xruns = runtime->xruns;
690 runtime->xruns = 0;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693 }
694
695 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
696 {
697 struct snd_rawmidi_file *rfile;
698 void __user *argp = (void __user *)arg;
699
700 rfile = file->private_data;
701 if (((cmd >> 8) & 0xff) != 'W')
702 return -ENOTTY;
703 switch (cmd) {
704 case SNDRV_RAWMIDI_IOCTL_PVERSION:
705 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
706 case SNDRV_RAWMIDI_IOCTL_INFO:
707 {
708 int stream;
709 struct snd_rawmidi_info __user *info = argp;
710 if (get_user(stream, &info->stream))
711 return -EFAULT;
712 switch (stream) {
713 case SNDRV_RAWMIDI_STREAM_INPUT:
714 return snd_rawmidi_info_user(rfile->input, info);
715 case SNDRV_RAWMIDI_STREAM_OUTPUT:
716 return snd_rawmidi_info_user(rfile->output, info);
717 default:
718 return -EINVAL;
719 }
720 }
721 case SNDRV_RAWMIDI_IOCTL_PARAMS:
722 {
723 struct snd_rawmidi_params params;
724 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
725 return -EFAULT;
726 switch (params.stream) {
727 case SNDRV_RAWMIDI_STREAM_OUTPUT:
728 if (rfile->output == NULL)
729 return -EINVAL;
730 return snd_rawmidi_output_params(rfile->output, &params);
731 case SNDRV_RAWMIDI_STREAM_INPUT:
732 if (rfile->input == NULL)
733 return -EINVAL;
734 return snd_rawmidi_input_params(rfile->input, &params);
735 default:
736 return -EINVAL;
737 }
738 }
739 case SNDRV_RAWMIDI_IOCTL_STATUS:
740 {
741 int err = 0;
742 struct snd_rawmidi_status status;
743 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
744 return -EFAULT;
745 switch (status.stream) {
746 case SNDRV_RAWMIDI_STREAM_OUTPUT:
747 if (rfile->output == NULL)
748 return -EINVAL;
749 err = snd_rawmidi_output_status(rfile->output, &status);
750 break;
751 case SNDRV_RAWMIDI_STREAM_INPUT:
752 if (rfile->input == NULL)
753 return -EINVAL;
754 err = snd_rawmidi_input_status(rfile->input, &status);
755 break;
756 default:
757 return -EINVAL;
758 }
759 if (err < 0)
760 return err;
761 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
762 return -EFAULT;
763 return 0;
764 }
765 case SNDRV_RAWMIDI_IOCTL_DROP:
766 {
767 int val;
768 if (get_user(val, (int __user *) argp))
769 return -EFAULT;
770 switch (val) {
771 case SNDRV_RAWMIDI_STREAM_OUTPUT:
772 if (rfile->output == NULL)
773 return -EINVAL;
774 return snd_rawmidi_drop_output(rfile->output);
775 default:
776 return -EINVAL;
777 }
778 }
779 case SNDRV_RAWMIDI_IOCTL_DRAIN:
780 {
781 int val;
782 if (get_user(val, (int __user *) argp))
783 return -EFAULT;
784 switch (val) {
785 case SNDRV_RAWMIDI_STREAM_OUTPUT:
786 if (rfile->output == NULL)
787 return -EINVAL;
788 return snd_rawmidi_drain_output(rfile->output);
789 case SNDRV_RAWMIDI_STREAM_INPUT:
790 if (rfile->input == NULL)
791 return -EINVAL;
792 return snd_rawmidi_drain_input(rfile->input);
793 default:
794 return -EINVAL;
795 }
796 }
797 #ifdef CONFIG_SND_DEBUG
798 default:
799 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
800 #endif
801 }
802 return -ENOTTY;
803 }
804
805 static int snd_rawmidi_control_ioctl(struct snd_card *card,
806 struct snd_ctl_file *control,
807 unsigned int cmd,
808 unsigned long arg)
809 {
810 void __user *argp = (void __user *)arg;
811
812 switch (cmd) {
813 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
814 {
815 int device;
816
817 if (get_user(device, (int __user *)argp))
818 return -EFAULT;
819 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
820 device = SNDRV_RAWMIDI_DEVICES - 1;
821 mutex_lock(&register_mutex);
822 device = device < 0 ? 0 : device + 1;
823 while (device < SNDRV_RAWMIDI_DEVICES) {
824 if (snd_rawmidi_search(card, device))
825 break;
826 device++;
827 }
828 if (device == SNDRV_RAWMIDI_DEVICES)
829 device = -1;
830 mutex_unlock(&register_mutex);
831 if (put_user(device, (int __user *)argp))
832 return -EFAULT;
833 return 0;
834 }
835 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
836 {
837 int val;
838
839 if (get_user(val, (int __user *)argp))
840 return -EFAULT;
841 control->prefer_rawmidi_subdevice = val;
842 return 0;
843 }
844 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
845 return snd_rawmidi_info_select_user(card, argp);
846 }
847 return -ENOIOCTLCMD;
848 }
849
850 /**
851 * snd_rawmidi_receive - receive the input data from the device
852 * @substream: the rawmidi substream
853 * @buffer: the buffer pointer
854 * @count: the data size to read
855 *
856 * Reads the data from the internal buffer.
857 *
858 * Returns the size of read data, or a negative error code on failure.
859 */
860 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
861 const unsigned char *buffer, int count)
862 {
863 unsigned long flags;
864 int result = 0, count1;
865 struct snd_rawmidi_runtime *runtime = substream->runtime;
866
867 if (!substream->opened)
868 return -EBADFD;
869 if (runtime->buffer == NULL) {
870 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
871 return -EINVAL;
872 }
873 spin_lock_irqsave(&runtime->lock, flags);
874 if (count == 1) { /* special case, faster code */
875 substream->bytes++;
876 if (runtime->avail < runtime->buffer_size) {
877 runtime->buffer[runtime->hw_ptr++] = buffer[0];
878 runtime->hw_ptr %= runtime->buffer_size;
879 runtime->avail++;
880 result++;
881 } else {
882 runtime->xruns++;
883 }
884 } else {
885 substream->bytes += count;
886 count1 = runtime->buffer_size - runtime->hw_ptr;
887 if (count1 > count)
888 count1 = count;
889 if (count1 > (int)(runtime->buffer_size - runtime->avail))
890 count1 = runtime->buffer_size - runtime->avail;
891 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
892 runtime->hw_ptr += count1;
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail += count1;
895 count -= count1;
896 result += count1;
897 if (count > 0) {
898 buffer += count1;
899 count1 = count;
900 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
901 count1 = runtime->buffer_size - runtime->avail;
902 runtime->xruns += count - count1;
903 }
904 if (count1 > 0) {
905 memcpy(runtime->buffer, buffer, count1);
906 runtime->hw_ptr = count1;
907 runtime->avail += count1;
908 result += count1;
909 }
910 }
911 }
912 if (result > 0) {
913 if (runtime->event)
914 schedule_work(&runtime->event_work);
915 else if (snd_rawmidi_ready(substream))
916 wake_up(&runtime->sleep);
917 }
918 spin_unlock_irqrestore(&runtime->lock, flags);
919 return result;
920 }
921
922 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
923 unsigned char __user *userbuf,
924 unsigned char *kernelbuf, long count)
925 {
926 unsigned long flags;
927 long result = 0, count1;
928 struct snd_rawmidi_runtime *runtime = substream->runtime;
929
930 while (count > 0 && runtime->avail) {
931 count1 = runtime->buffer_size - runtime->appl_ptr;
932 if (count1 > count)
933 count1 = count;
934 spin_lock_irqsave(&runtime->lock, flags);
935 if (count1 > (int)runtime->avail)
936 count1 = runtime->avail;
937 if (kernelbuf)
938 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
939 if (userbuf) {
940 spin_unlock_irqrestore(&runtime->lock, flags);
941 if (copy_to_user(userbuf + result,
942 runtime->buffer + runtime->appl_ptr, count1)) {
943 return result > 0 ? result : -EFAULT;
944 }
945 spin_lock_irqsave(&runtime->lock, flags);
946 }
947 runtime->appl_ptr += count1;
948 runtime->appl_ptr %= runtime->buffer_size;
949 runtime->avail -= count1;
950 spin_unlock_irqrestore(&runtime->lock, flags);
951 result += count1;
952 count -= count1;
953 }
954 return result;
955 }
956
957 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
958 unsigned char *buf, long count)
959 {
960 snd_rawmidi_input_trigger(substream, 1);
961 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
962 }
963
964 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
965 loff_t *offset)
966 {
967 long result;
968 int count1;
969 struct snd_rawmidi_file *rfile;
970 struct snd_rawmidi_substream *substream;
971 struct snd_rawmidi_runtime *runtime;
972
973 rfile = file->private_data;
974 substream = rfile->input;
975 if (substream == NULL)
976 return -EIO;
977 runtime = substream->runtime;
978 snd_rawmidi_input_trigger(substream, 1);
979 result = 0;
980 while (count > 0) {
981 spin_lock_irq(&runtime->lock);
982 while (!snd_rawmidi_ready(substream)) {
983 wait_queue_t wait;
984 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
985 spin_unlock_irq(&runtime->lock);
986 return result > 0 ? result : -EAGAIN;
987 }
988 init_waitqueue_entry(&wait, current);
989 add_wait_queue(&runtime->sleep, &wait);
990 set_current_state(TASK_INTERRUPTIBLE);
991 spin_unlock_irq(&runtime->lock);
992 schedule();
993 remove_wait_queue(&runtime->sleep, &wait);
994 if (signal_pending(current))
995 return result > 0 ? result : -ERESTARTSYS;
996 if (!runtime->avail)
997 return result > 0 ? result : -EIO;
998 spin_lock_irq(&runtime->lock);
999 }
1000 spin_unlock_irq(&runtime->lock);
1001 count1 = snd_rawmidi_kernel_read1(substream,
1002 (unsigned char __user *)buf,
1003 NULL/*kernelbuf*/,
1004 count);
1005 if (count1 < 0)
1006 return result > 0 ? result : count1;
1007 result += count1;
1008 buf += count1;
1009 count -= count1;
1010 }
1011 return result;
1012 }
1013
1014 /**
1015 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1016 * @substream: the rawmidi substream
1017 *
1018 * Returns 1 if the internal output buffer is empty, 0 if not.
1019 */
1020 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1021 {
1022 struct snd_rawmidi_runtime *runtime = substream->runtime;
1023 int result;
1024 unsigned long flags;
1025
1026 if (runtime->buffer == NULL) {
1027 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1028 return 1;
1029 }
1030 spin_lock_irqsave(&runtime->lock, flags);
1031 result = runtime->avail >= runtime->buffer_size;
1032 spin_unlock_irqrestore(&runtime->lock, flags);
1033 return result;
1034 }
1035
1036 /**
1037 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1038 * @substream: the rawmidi substream
1039 * @buffer: the buffer pointer
1040 * @count: data size to transfer
1041 *
1042 * Copies data from the internal output buffer to the given buffer.
1043 *
1044 * Call this in the interrupt handler when the midi output is ready,
1045 * and call snd_rawmidi_transmit_ack() after the transmission is
1046 * finished.
1047 *
1048 * Returns the size of copied data, or a negative error code on failure.
1049 */
1050 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1051 unsigned char *buffer, int count)
1052 {
1053 unsigned long flags;
1054 int result, count1;
1055 struct snd_rawmidi_runtime *runtime = substream->runtime;
1056
1057 if (runtime->buffer == NULL) {
1058 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1059 return -EINVAL;
1060 }
1061 result = 0;
1062 spin_lock_irqsave(&runtime->lock, flags);
1063 if (runtime->avail >= runtime->buffer_size) {
1064 /* warning: lowlevel layer MUST trigger down the hardware */
1065 goto __skip;
1066 }
1067 if (count == 1) { /* special case, faster code */
1068 *buffer = runtime->buffer[runtime->hw_ptr];
1069 result++;
1070 } else {
1071 count1 = runtime->buffer_size - runtime->hw_ptr;
1072 if (count1 > count)
1073 count1 = count;
1074 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1075 count1 = runtime->buffer_size - runtime->avail;
1076 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1077 count -= count1;
1078 result += count1;
1079 if (count > 0) {
1080 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1081 count = runtime->buffer_size - runtime->avail - count1;
1082 memcpy(buffer + count1, runtime->buffer, count);
1083 result += count;
1084 }
1085 }
1086 __skip:
1087 spin_unlock_irqrestore(&runtime->lock, flags);
1088 return result;
1089 }
1090
1091 /**
1092 * snd_rawmidi_transmit_ack - acknowledge the transmission
1093 * @substream: the rawmidi substream
1094 * @count: the tranferred count
1095 *
1096 * Advances the hardware pointer for the internal output buffer with
1097 * the given size and updates the condition.
1098 * Call after the transmission is finished.
1099 *
1100 * Returns the advanced size if successful, or a negative error code on failure.
1101 */
1102 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1103 {
1104 unsigned long flags;
1105 struct snd_rawmidi_runtime *runtime = substream->runtime;
1106
1107 if (runtime->buffer == NULL) {
1108 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1109 return -EINVAL;
1110 }
1111 spin_lock_irqsave(&runtime->lock, flags);
1112 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1113 runtime->hw_ptr += count;
1114 runtime->hw_ptr %= runtime->buffer_size;
1115 runtime->avail += count;
1116 substream->bytes += count;
1117 if (count > 0) {
1118 if (runtime->drain || snd_rawmidi_ready(substream))
1119 wake_up(&runtime->sleep);
1120 }
1121 spin_unlock_irqrestore(&runtime->lock, flags);
1122 return count;
1123 }
1124
1125 /**
1126 * snd_rawmidi_transmit - copy from the buffer to the device
1127 * @substream: the rawmidi substream
1128 * @buffer: the buffer pointer
1129 * @count: the data size to transfer
1130 *
1131 * Copies data from the buffer to the device and advances the pointer.
1132 *
1133 * Returns the copied size if successful, or a negative error code on failure.
1134 */
1135 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1136 unsigned char *buffer, int count)
1137 {
1138 if (!substream->opened)
1139 return -EBADFD;
1140 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1141 if (count < 0)
1142 return count;
1143 return snd_rawmidi_transmit_ack(substream, count);
1144 }
1145
1146 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1147 const unsigned char __user *userbuf,
1148 const unsigned char *kernelbuf,
1149 long count)
1150 {
1151 unsigned long flags;
1152 long count1, result;
1153 struct snd_rawmidi_runtime *runtime = substream->runtime;
1154
1155 if (snd_BUG_ON(!kernelbuf && !userbuf))
1156 return -EINVAL;
1157 if (snd_BUG_ON(!runtime->buffer))
1158 return -EINVAL;
1159
1160 result = 0;
1161 spin_lock_irqsave(&runtime->lock, flags);
1162 if (substream->append) {
1163 if ((long)runtime->avail < count) {
1164 spin_unlock_irqrestore(&runtime->lock, flags);
1165 return -EAGAIN;
1166 }
1167 }
1168 while (count > 0 && runtime->avail > 0) {
1169 count1 = runtime->buffer_size - runtime->appl_ptr;
1170 if (count1 > count)
1171 count1 = count;
1172 if (count1 > (long)runtime->avail)
1173 count1 = runtime->avail;
1174 if (kernelbuf)
1175 memcpy(runtime->buffer + runtime->appl_ptr,
1176 kernelbuf + result, count1);
1177 else if (userbuf) {
1178 spin_unlock_irqrestore(&runtime->lock, flags);
1179 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1180 userbuf + result, count1)) {
1181 spin_lock_irqsave(&runtime->lock, flags);
1182 result = result > 0 ? result : -EFAULT;
1183 goto __end;
1184 }
1185 spin_lock_irqsave(&runtime->lock, flags);
1186 }
1187 runtime->appl_ptr += count1;
1188 runtime->appl_ptr %= runtime->buffer_size;
1189 runtime->avail -= count1;
1190 result += count1;
1191 count -= count1;
1192 }
1193 __end:
1194 count1 = runtime->avail < runtime->buffer_size;
1195 spin_unlock_irqrestore(&runtime->lock, flags);
1196 if (count1)
1197 snd_rawmidi_output_trigger(substream, 1);
1198 return result;
1199 }
1200
1201 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1202 const unsigned char *buf, long count)
1203 {
1204 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1205 }
1206
1207 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1208 size_t count, loff_t *offset)
1209 {
1210 long result, timeout;
1211 int count1;
1212 struct snd_rawmidi_file *rfile;
1213 struct snd_rawmidi_runtime *runtime;
1214 struct snd_rawmidi_substream *substream;
1215
1216 rfile = file->private_data;
1217 substream = rfile->output;
1218 runtime = substream->runtime;
1219 /* we cannot put an atomic message to our buffer */
1220 if (substream->append && count > runtime->buffer_size)
1221 return -EIO;
1222 result = 0;
1223 while (count > 0) {
1224 spin_lock_irq(&runtime->lock);
1225 while (!snd_rawmidi_ready_append(substream, count)) {
1226 wait_queue_t wait;
1227 if (file->f_flags & O_NONBLOCK) {
1228 spin_unlock_irq(&runtime->lock);
1229 return result > 0 ? result : -EAGAIN;
1230 }
1231 init_waitqueue_entry(&wait, current);
1232 add_wait_queue(&runtime->sleep, &wait);
1233 set_current_state(TASK_INTERRUPTIBLE);
1234 spin_unlock_irq(&runtime->lock);
1235 timeout = schedule_timeout(30 * HZ);
1236 remove_wait_queue(&runtime->sleep, &wait);
1237 if (signal_pending(current))
1238 return result > 0 ? result : -ERESTARTSYS;
1239 if (!runtime->avail && !timeout)
1240 return result > 0 ? result : -EIO;
1241 spin_lock_irq(&runtime->lock);
1242 }
1243 spin_unlock_irq(&runtime->lock);
1244 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1245 if (count1 < 0)
1246 return result > 0 ? result : count1;
1247 result += count1;
1248 buf += count1;
1249 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1250 break;
1251 count -= count1;
1252 }
1253 if (file->f_flags & O_DSYNC) {
1254 spin_lock_irq(&runtime->lock);
1255 while (runtime->avail != runtime->buffer_size) {
1256 wait_queue_t wait;
1257 unsigned int last_avail = runtime->avail;
1258 init_waitqueue_entry(&wait, current);
1259 add_wait_queue(&runtime->sleep, &wait);
1260 set_current_state(TASK_INTERRUPTIBLE);
1261 spin_unlock_irq(&runtime->lock);
1262 timeout = schedule_timeout(30 * HZ);
1263 remove_wait_queue(&runtime->sleep, &wait);
1264 if (signal_pending(current))
1265 return result > 0 ? result : -ERESTARTSYS;
1266 if (runtime->avail == last_avail && !timeout)
1267 return result > 0 ? result : -EIO;
1268 spin_lock_irq(&runtime->lock);
1269 }
1270 spin_unlock_irq(&runtime->lock);
1271 }
1272 return result;
1273 }
1274
1275 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1276 {
1277 struct snd_rawmidi_file *rfile;
1278 struct snd_rawmidi_runtime *runtime;
1279 unsigned int mask;
1280
1281 rfile = file->private_data;
1282 if (rfile->input != NULL) {
1283 runtime = rfile->input->runtime;
1284 snd_rawmidi_input_trigger(rfile->input, 1);
1285 poll_wait(file, &runtime->sleep, wait);
1286 }
1287 if (rfile->output != NULL) {
1288 runtime = rfile->output->runtime;
1289 poll_wait(file, &runtime->sleep, wait);
1290 }
1291 mask = 0;
1292 if (rfile->input != NULL) {
1293 if (snd_rawmidi_ready(rfile->input))
1294 mask |= POLLIN | POLLRDNORM;
1295 }
1296 if (rfile->output != NULL) {
1297 if (snd_rawmidi_ready(rfile->output))
1298 mask |= POLLOUT | POLLWRNORM;
1299 }
1300 return mask;
1301 }
1302
1303 /*
1304 */
1305 #ifdef CONFIG_COMPAT
1306 #include "rawmidi_compat.c"
1307 #else
1308 #define snd_rawmidi_ioctl_compat NULL
1309 #endif
1310
1311 /*
1312
1313 */
1314
1315 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1316 struct snd_info_buffer *buffer)
1317 {
1318 struct snd_rawmidi *rmidi;
1319 struct snd_rawmidi_substream *substream;
1320 struct snd_rawmidi_runtime *runtime;
1321
1322 rmidi = entry->private_data;
1323 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1324 mutex_lock(&rmidi->open_mutex);
1325 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1326 list_for_each_entry(substream,
1327 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1328 list) {
1329 snd_iprintf(buffer,
1330 "Output %d\n"
1331 " Tx bytes : %lu\n",
1332 substream->number,
1333 (unsigned long) substream->bytes);
1334 if (substream->opened) {
1335 snd_iprintf(buffer,
1336 " Owner PID : %d\n",
1337 pid_vnr(substream->pid));
1338 runtime = substream->runtime;
1339 snd_iprintf(buffer,
1340 " Mode : %s\n"
1341 " Buffer size : %lu\n"
1342 " Avail : %lu\n",
1343 runtime->oss ? "OSS compatible" : "native",
1344 (unsigned long) runtime->buffer_size,
1345 (unsigned long) runtime->avail);
1346 }
1347 }
1348 }
1349 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1350 list_for_each_entry(substream,
1351 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1352 list) {
1353 snd_iprintf(buffer,
1354 "Input %d\n"
1355 " Rx bytes : %lu\n",
1356 substream->number,
1357 (unsigned long) substream->bytes);
1358 if (substream->opened) {
1359 snd_iprintf(buffer,
1360 " Owner PID : %d\n",
1361 pid_vnr(substream->pid));
1362 runtime = substream->runtime;
1363 snd_iprintf(buffer,
1364 " Buffer size : %lu\n"
1365 " Avail : %lu\n"
1366 " Overruns : %lu\n",
1367 (unsigned long) runtime->buffer_size,
1368 (unsigned long) runtime->avail,
1369 (unsigned long) runtime->xruns);
1370 }
1371 }
1372 }
1373 mutex_unlock(&rmidi->open_mutex);
1374 }
1375
1376 /*
1377 * Register functions
1378 */
1379
1380 static const struct file_operations snd_rawmidi_f_ops =
1381 {
1382 .owner = THIS_MODULE,
1383 .read = snd_rawmidi_read,
1384 .write = snd_rawmidi_write,
1385 .open = snd_rawmidi_open,
1386 .release = snd_rawmidi_release,
1387 .llseek = no_llseek,
1388 .poll = snd_rawmidi_poll,
1389 .unlocked_ioctl = snd_rawmidi_ioctl,
1390 .compat_ioctl = snd_rawmidi_ioctl_compat,
1391 };
1392
1393 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1394 struct snd_rawmidi_str *stream,
1395 int direction,
1396 int count)
1397 {
1398 struct snd_rawmidi_substream *substream;
1399 int idx;
1400
1401 for (idx = 0; idx < count; idx++) {
1402 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1403 if (substream == NULL) {
1404 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1405 return -ENOMEM;
1406 }
1407 substream->stream = direction;
1408 substream->number = idx;
1409 substream->rmidi = rmidi;
1410 substream->pstr = stream;
1411 list_add_tail(&substream->list, &stream->substreams);
1412 stream->substream_count++;
1413 }
1414 return 0;
1415 }
1416
1417 /**
1418 * snd_rawmidi_new - create a rawmidi instance
1419 * @card: the card instance
1420 * @id: the id string
1421 * @device: the device index
1422 * @output_count: the number of output streams
1423 * @input_count: the number of input streams
1424 * @rrawmidi: the pointer to store the new rawmidi instance
1425 *
1426 * Creates a new rawmidi instance.
1427 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1428 *
1429 * Returns zero if successful, or a negative error code on failure.
1430 */
1431 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1432 int output_count, int input_count,
1433 struct snd_rawmidi ** rrawmidi)
1434 {
1435 struct snd_rawmidi *rmidi;
1436 int err;
1437 static struct snd_device_ops ops = {
1438 .dev_free = snd_rawmidi_dev_free,
1439 .dev_register = snd_rawmidi_dev_register,
1440 .dev_disconnect = snd_rawmidi_dev_disconnect,
1441 };
1442
1443 if (snd_BUG_ON(!card))
1444 return -ENXIO;
1445 if (rrawmidi)
1446 *rrawmidi = NULL;
1447 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1448 if (rmidi == NULL) {
1449 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1450 return -ENOMEM;
1451 }
1452 rmidi->card = card;
1453 rmidi->device = device;
1454 mutex_init(&rmidi->open_mutex);
1455 init_waitqueue_head(&rmidi->open_wait);
1456 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1457 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1458
1459 if (id != NULL)
1460 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1461 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1462 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1463 SNDRV_RAWMIDI_STREAM_INPUT,
1464 input_count)) < 0) {
1465 snd_rawmidi_free(rmidi);
1466 return err;
1467 }
1468 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1469 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1470 SNDRV_RAWMIDI_STREAM_OUTPUT,
1471 output_count)) < 0) {
1472 snd_rawmidi_free(rmidi);
1473 return err;
1474 }
1475 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1476 snd_rawmidi_free(rmidi);
1477 return err;
1478 }
1479 if (rrawmidi)
1480 *rrawmidi = rmidi;
1481 return 0;
1482 }
1483
1484 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1485 {
1486 struct snd_rawmidi_substream *substream;
1487
1488 while (!list_empty(&stream->substreams)) {
1489 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1490 list_del(&substream->list);
1491 kfree(substream);
1492 }
1493 }
1494
1495 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1496 {
1497 if (!rmidi)
1498 return 0;
1499
1500 snd_info_free_entry(rmidi->proc_entry);
1501 rmidi->proc_entry = NULL;
1502 mutex_lock(&register_mutex);
1503 if (rmidi->ops && rmidi->ops->dev_unregister)
1504 rmidi->ops->dev_unregister(rmidi);
1505 mutex_unlock(&register_mutex);
1506
1507 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1508 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1509 if (rmidi->private_free)
1510 rmidi->private_free(rmidi);
1511 kfree(rmidi);
1512 return 0;
1513 }
1514
1515 static int snd_rawmidi_dev_free(struct snd_device *device)
1516 {
1517 struct snd_rawmidi *rmidi = device->device_data;
1518 return snd_rawmidi_free(rmidi);
1519 }
1520
1521 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1522 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1523 {
1524 struct snd_rawmidi *rmidi = device->private_data;
1525 rmidi->seq_dev = NULL;
1526 }
1527 #endif
1528
1529 static int snd_rawmidi_dev_register(struct snd_device *device)
1530 {
1531 int err;
1532 struct snd_info_entry *entry;
1533 char name[16];
1534 struct snd_rawmidi *rmidi = device->device_data;
1535
1536 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1537 return -ENOMEM;
1538 mutex_lock(&register_mutex);
1539 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1540 mutex_unlock(&register_mutex);
1541 return -EBUSY;
1542 }
1543 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1544 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1545 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1546 rmidi->card, rmidi->device,
1547 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1548 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1549 list_del(&rmidi->list);
1550 mutex_unlock(&register_mutex);
1551 return err;
1552 }
1553 if (rmidi->ops && rmidi->ops->dev_register &&
1554 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1555 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1556 list_del(&rmidi->list);
1557 mutex_unlock(&register_mutex);
1558 return err;
1559 }
1560 #ifdef CONFIG_SND_OSSEMUL
1561 rmidi->ossreg = 0;
1562 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1563 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1564 rmidi->card, 0, &snd_rawmidi_f_ops,
1565 rmidi, name) < 0) {
1566 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1567 } else {
1568 rmidi->ossreg++;
1569 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1570 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1571 #endif
1572 }
1573 }
1574 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1575 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1576 rmidi->card, 1, &snd_rawmidi_f_ops,
1577 rmidi, name) < 0) {
1578 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1579 } else {
1580 rmidi->ossreg++;
1581 }
1582 }
1583 #endif /* CONFIG_SND_OSSEMUL */
1584 mutex_unlock(&register_mutex);
1585 sprintf(name, "midi%d", rmidi->device);
1586 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1587 if (entry) {
1588 entry->private_data = rmidi;
1589 entry->c.text.read = snd_rawmidi_proc_info_read;
1590 if (snd_info_register(entry) < 0) {
1591 snd_info_free_entry(entry);
1592 entry = NULL;
1593 }
1594 }
1595 rmidi->proc_entry = entry;
1596 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1597 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1598 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1599 rmidi->seq_dev->private_data = rmidi;
1600 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1601 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1602 snd_device_register(rmidi->card, rmidi->seq_dev);
1603 }
1604 }
1605 #endif
1606 return 0;
1607 }
1608
1609 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1610 {
1611 struct snd_rawmidi *rmidi = device->device_data;
1612
1613 mutex_lock(&register_mutex);
1614 list_del_init(&rmidi->list);
1615 #ifdef CONFIG_SND_OSSEMUL
1616 if (rmidi->ossreg) {
1617 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1618 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1619 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1620 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1621 #endif
1622 }
1623 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1624 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1625 rmidi->ossreg = 0;
1626 }
1627 #endif /* CONFIG_SND_OSSEMUL */
1628 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1629 mutex_unlock(&register_mutex);
1630 return 0;
1631 }
1632
1633 /**
1634 * snd_rawmidi_set_ops - set the rawmidi operators
1635 * @rmidi: the rawmidi instance
1636 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1637 * @ops: the operator table
1638 *
1639 * Sets the rawmidi operators for the given stream direction.
1640 */
1641 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1642 struct snd_rawmidi_ops *ops)
1643 {
1644 struct snd_rawmidi_substream *substream;
1645
1646 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1647 substream->ops = ops;
1648 }
1649
1650 /*
1651 * ENTRY functions
1652 */
1653
1654 static int __init alsa_rawmidi_init(void)
1655 {
1656
1657 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1658 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1659 #ifdef CONFIG_SND_OSSEMUL
1660 { int i;
1661 /* check device map table */
1662 for (i = 0; i < SNDRV_CARDS; i++) {
1663 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1664 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1665 midi_map[i] = 0;
1666 }
1667 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1668 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1669 amidi_map[i] = 1;
1670 }
1671 }
1672 }
1673 #endif /* CONFIG_SND_OSSEMUL */
1674 return 0;
1675 }
1676
1677 static void __exit alsa_rawmidi_exit(void)
1678 {
1679 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1680 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1681 }
1682
1683 module_init(alsa_rawmidi_init)
1684 module_exit(alsa_rawmidi_exit)
1685
1686 EXPORT_SYMBOL(snd_rawmidi_output_params);
1687 EXPORT_SYMBOL(snd_rawmidi_input_params);
1688 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1689 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1690 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1691 EXPORT_SYMBOL(snd_rawmidi_receive);
1692 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1695 EXPORT_SYMBOL(snd_rawmidi_transmit);
1696 EXPORT_SYMBOL(snd_rawmidi_new);
1697 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1698 EXPORT_SYMBOL(snd_rawmidi_info_select);
1699 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1700 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1702 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
Linux 2.6 libata-dev (mirror)