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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[deliverable/linux.git] / sound / core / rawmidi.c
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 #define rmidi_err(rmidi, fmt, args...) \
60 dev_err((rmidi)->card->dev, fmt, ##args)
61 #define rmidi_warn(rmidi, fmt, args...) \
62 dev_warn((rmidi)->card->dev, fmt, ##args)
63 #define rmidi_dbg(rmidi, fmt, args...) \
64 dev_dbg((rmidi)->card->dev, fmt, ##args)
65
66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
67 {
68 struct snd_rawmidi *rawmidi;
69
70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
71 if (rawmidi->card == card && rawmidi->device == device)
72 return rawmidi;
73 return NULL;
74 }
75
76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
77 {
78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
79 case FMODE_WRITE:
80 return SNDRV_RAWMIDI_LFLG_OUTPUT;
81 case FMODE_READ:
82 return SNDRV_RAWMIDI_LFLG_INPUT;
83 default:
84 return SNDRV_RAWMIDI_LFLG_OPEN;
85 }
86 }
87
88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
89 {
90 struct snd_rawmidi_runtime *runtime = substream->runtime;
91 return runtime->avail >= runtime->avail_min;
92 }
93
94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
95 size_t count)
96 {
97 struct snd_rawmidi_runtime *runtime = substream->runtime;
98 return runtime->avail >= runtime->avail_min &&
99 (!substream->append || runtime->avail >= count);
100 }
101
102 static void snd_rawmidi_input_event_work(struct work_struct *work)
103 {
104 struct snd_rawmidi_runtime *runtime =
105 container_of(work, struct snd_rawmidi_runtime, event_work);
106 if (runtime->event)
107 runtime->event(runtime->substream);
108 }
109
110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
111 {
112 struct snd_rawmidi_runtime *runtime;
113
114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
115 return -ENOMEM;
116 runtime->substream = substream;
117 spin_lock_init(&runtime->lock);
118 init_waitqueue_head(&runtime->sleep);
119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
120 runtime->event = NULL;
121 runtime->buffer_size = PAGE_SIZE;
122 runtime->avail_min = 1;
123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
124 runtime->avail = 0;
125 else
126 runtime->avail = runtime->buffer_size;
127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
128 kfree(runtime);
129 return -ENOMEM;
130 }
131 runtime->appl_ptr = runtime->hw_ptr = 0;
132 substream->runtime = runtime;
133 return 0;
134 }
135
136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
137 {
138 struct snd_rawmidi_runtime *runtime = substream->runtime;
139
140 kfree(runtime->buffer);
141 kfree(runtime);
142 substream->runtime = NULL;
143 return 0;
144 }
145
146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
147 {
148 if (!substream->opened)
149 return;
150 substream->ops->trigger(substream, up);
151 }
152
153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155 if (!substream->opened)
156 return;
157 substream->ops->trigger(substream, up);
158 if (!up)
159 cancel_work_sync(&substream->runtime->event_work);
160 }
161
162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
163 {
164 unsigned long flags;
165 struct snd_rawmidi_runtime *runtime = substream->runtime;
166
167 snd_rawmidi_output_trigger(substream, 0);
168 runtime->drain = 0;
169 spin_lock_irqsave(&runtime->lock, flags);
170 runtime->appl_ptr = runtime->hw_ptr = 0;
171 runtime->avail = runtime->buffer_size;
172 spin_unlock_irqrestore(&runtime->lock, flags);
173 return 0;
174 }
175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
178 {
179 int err;
180 long timeout;
181 struct snd_rawmidi_runtime *runtime = substream->runtime;
182
183 err = 0;
184 runtime->drain = 1;
185 timeout = wait_event_interruptible_timeout(runtime->sleep,
186 (runtime->avail >= runtime->buffer_size),
187 10*HZ);
188 if (signal_pending(current))
189 err = -ERESTARTSYS;
190 if (runtime->avail < runtime->buffer_size && !timeout) {
191 rmidi_warn(substream->rmidi,
192 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
193 (long)runtime->avail, (long)runtime->buffer_size);
194 err = -EIO;
195 }
196 runtime->drain = 0;
197 if (err != -ERESTARTSYS) {
198 /* we need wait a while to make sure that Tx FIFOs are empty */
199 if (substream->ops->drain)
200 substream->ops->drain(substream);
201 else
202 msleep(50);
203 snd_rawmidi_drop_output(substream);
204 }
205 return err;
206 }
207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210 {
211 unsigned long flags;
212 struct snd_rawmidi_runtime *runtime = substream->runtime;
213
214 snd_rawmidi_input_trigger(substream, 0);
215 runtime->drain = 0;
216 spin_lock_irqsave(&runtime->lock, flags);
217 runtime->appl_ptr = runtime->hw_ptr = 0;
218 runtime->avail = 0;
219 spin_unlock_irqrestore(&runtime->lock, flags);
220 return 0;
221 }
222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
223
224 /* look for an available substream for the given stream direction;
225 * if a specific subdevice is given, try to assign it
226 */
227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
228 int stream, int mode,
229 struct snd_rawmidi_substream **sub_ret)
230 {
231 struct snd_rawmidi_substream *substream;
232 struct snd_rawmidi_str *s = &rmidi->streams[stream];
233 static unsigned int info_flags[2] = {
234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
236 };
237
238 if (!(rmidi->info_flags & info_flags[stream]))
239 return -ENXIO;
240 if (subdevice >= 0 && subdevice >= s->substream_count)
241 return -ENODEV;
242
243 list_for_each_entry(substream, &s->substreams, list) {
244 if (substream->opened) {
245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
247 !substream->append)
248 continue;
249 }
250 if (subdevice < 0 || subdevice == substream->number) {
251 *sub_ret = substream;
252 return 0;
253 }
254 }
255 return -EAGAIN;
256 }
257
258 /* open and do ref-counting for the given substream */
259 static int open_substream(struct snd_rawmidi *rmidi,
260 struct snd_rawmidi_substream *substream,
261 int mode)
262 {
263 int err;
264
265 if (substream->use_count == 0) {
266 err = snd_rawmidi_runtime_create(substream);
267 if (err < 0)
268 return err;
269 err = substream->ops->open(substream);
270 if (err < 0) {
271 snd_rawmidi_runtime_free(substream);
272 return err;
273 }
274 substream->opened = 1;
275 substream->active_sensing = 0;
276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
277 substream->append = 1;
278 substream->pid = get_pid(task_pid(current));
279 rmidi->streams[substream->stream].substream_opened++;
280 }
281 substream->use_count++;
282 return 0;
283 }
284
285 static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
290 struct snd_rawmidi_file *rfile)
291 {
292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
293 int err;
294
295 rfile->input = rfile->output = NULL;
296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
297 err = assign_substream(rmidi, subdevice,
298 SNDRV_RAWMIDI_STREAM_INPUT,
299 mode, &sinput);
300 if (err < 0)
301 return err;
302 }
303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
304 err = assign_substream(rmidi, subdevice,
305 SNDRV_RAWMIDI_STREAM_OUTPUT,
306 mode, &soutput);
307 if (err < 0)
308 return err;
309 }
310
311 if (sinput) {
312 err = open_substream(rmidi, sinput, mode);
313 if (err < 0)
314 return err;
315 }
316 if (soutput) {
317 err = open_substream(rmidi, soutput, mode);
318 if (err < 0) {
319 if (sinput)
320 close_substream(rmidi, sinput, 0);
321 return err;
322 }
323 }
324
325 rfile->rmidi = rmidi;
326 rfile->input = sinput;
327 rfile->output = soutput;
328 return 0;
329 }
330
331 /* called from sound/core/seq/seq_midi.c */
332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
333 int mode, struct snd_rawmidi_file * rfile)
334 {
335 struct snd_rawmidi *rmidi;
336 int err;
337
338 if (snd_BUG_ON(!rfile))
339 return -EINVAL;
340
341 mutex_lock(&register_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(&register_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(&register_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(&register_mutex);
352
353 mutex_lock(&rmidi->open_mutex);
354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
355 mutex_unlock(&rmidi->open_mutex);
356 if (err < 0)
357 module_put(rmidi->card->module);
358 return err;
359 }
360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
363 {
364 int maj = imajor(inode);
365 struct snd_card *card;
366 int subdevice;
367 unsigned short fflags;
368 int err;
369 struct snd_rawmidi *rmidi;
370 struct snd_rawmidi_file *rawmidi_file = NULL;
371 wait_queue_t wait;
372 struct snd_ctl_file *kctl;
373
374 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
375 return -EINVAL; /* invalid combination */
376
377 err = nonseekable_open(inode, file);
378 if (err < 0)
379 return err;
380
381 if (maj == snd_major) {
382 rmidi = snd_lookup_minor_data(iminor(inode),
383 SNDRV_DEVICE_TYPE_RAWMIDI);
384 #ifdef CONFIG_SND_OSSEMUL
385 } else if (maj == SOUND_MAJOR) {
386 rmidi = snd_lookup_oss_minor_data(iminor(inode),
387 SNDRV_OSS_DEVICE_TYPE_MIDI);
388 #endif
389 } else
390 return -ENXIO;
391
392 if (rmidi == NULL)
393 return -ENODEV;
394
395 if (!try_module_get(rmidi->card->module)) {
396 snd_card_unref(rmidi->card);
397 return -ENXIO;
398 }
399
400 mutex_lock(&rmidi->open_mutex);
401 card = rmidi->card;
402 err = snd_card_file_add(card, file);
403 if (err < 0)
404 goto __error_card;
405 fflags = snd_rawmidi_file_flags(file);
406 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
407 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
408 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
409 if (rawmidi_file == NULL) {
410 err = -ENOMEM;
411 goto __error;
412 }
413 init_waitqueue_entry(&wait, current);
414 add_wait_queue(&rmidi->open_wait, &wait);
415 while (1) {
416 subdevice = -1;
417 read_lock(&card->ctl_files_rwlock);
418 list_for_each_entry(kctl, &card->ctl_files, list) {
419 if (kctl->pid == task_pid(current)) {
420 subdevice = kctl->prefer_rawmidi_subdevice;
421 if (subdevice != -1)
422 break;
423 }
424 }
425 read_unlock(&card->ctl_files_rwlock);
426 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
427 if (err >= 0)
428 break;
429 if (err == -EAGAIN) {
430 if (file->f_flags & O_NONBLOCK) {
431 err = -EBUSY;
432 break;
433 }
434 } else
435 break;
436 set_current_state(TASK_INTERRUPTIBLE);
437 mutex_unlock(&rmidi->open_mutex);
438 schedule();
439 mutex_lock(&rmidi->open_mutex);
440 if (rmidi->card->shutdown) {
441 err = -ENODEV;
442 break;
443 }
444 if (signal_pending(current)) {
445 err = -ERESTARTSYS;
446 break;
447 }
448 }
449 remove_wait_queue(&rmidi->open_wait, &wait);
450 if (err < 0) {
451 kfree(rawmidi_file);
452 goto __error;
453 }
454 #ifdef CONFIG_SND_OSSEMUL
455 if (rawmidi_file->input && rawmidi_file->input->runtime)
456 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
457 if (rawmidi_file->output && rawmidi_file->output->runtime)
458 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
459 #endif
460 file->private_data = rawmidi_file;
461 mutex_unlock(&rmidi->open_mutex);
462 snd_card_unref(rmidi->card);
463 return 0;
464
465 __error:
466 snd_card_file_remove(card, file);
467 __error_card:
468 mutex_unlock(&rmidi->open_mutex);
469 module_put(rmidi->card->module);
470 snd_card_unref(rmidi->card);
471 return err;
472 }
473
474 static void close_substream(struct snd_rawmidi *rmidi,
475 struct snd_rawmidi_substream *substream,
476 int cleanup)
477 {
478 if (--substream->use_count)
479 return;
480
481 if (cleanup) {
482 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
483 snd_rawmidi_input_trigger(substream, 0);
484 else {
485 if (substream->active_sensing) {
486 unsigned char buf = 0xfe;
487 /* sending single active sensing message
488 * to shut the device up
489 */
490 snd_rawmidi_kernel_write(substream, &buf, 1);
491 }
492 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
493 snd_rawmidi_output_trigger(substream, 0);
494 }
495 }
496 substream->ops->close(substream);
497 if (substream->runtime->private_free)
498 substream->runtime->private_free(substream);
499 snd_rawmidi_runtime_free(substream);
500 substream->opened = 0;
501 substream->append = 0;
502 put_pid(substream->pid);
503 substream->pid = NULL;
504 rmidi->streams[substream->stream].substream_opened--;
505 }
506
507 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
508 {
509 struct snd_rawmidi *rmidi;
510
511 rmidi = rfile->rmidi;
512 mutex_lock(&rmidi->open_mutex);
513 if (rfile->input) {
514 close_substream(rmidi, rfile->input, 1);
515 rfile->input = NULL;
516 }
517 if (rfile->output) {
518 close_substream(rmidi, rfile->output, 1);
519 rfile->output = NULL;
520 }
521 rfile->rmidi = NULL;
522 mutex_unlock(&rmidi->open_mutex);
523 wake_up(&rmidi->open_wait);
524 }
525
526 /* called from sound/core/seq/seq_midi.c */
527 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
528 {
529 struct snd_rawmidi *rmidi;
530
531 if (snd_BUG_ON(!rfile))
532 return -ENXIO;
533
534 rmidi = rfile->rmidi;
535 rawmidi_release_priv(rfile);
536 module_put(rmidi->card->module);
537 return 0;
538 }
539 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
540
541 static int snd_rawmidi_release(struct inode *inode, struct file *file)
542 {
543 struct snd_rawmidi_file *rfile;
544 struct snd_rawmidi *rmidi;
545 struct module *module;
546
547 rfile = file->private_data;
548 rmidi = rfile->rmidi;
549 rawmidi_release_priv(rfile);
550 kfree(rfile);
551 module = rmidi->card->module;
552 snd_card_file_remove(rmidi->card, file);
553 module_put(module);
554 return 0;
555 }
556
557 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
558 struct snd_rawmidi_info *info)
559 {
560 struct snd_rawmidi *rmidi;
561
562 if (substream == NULL)
563 return -ENODEV;
564 rmidi = substream->rmidi;
565 memset(info, 0, sizeof(*info));
566 info->card = rmidi->card->number;
567 info->device = rmidi->device;
568 info->subdevice = substream->number;
569 info->stream = substream->stream;
570 info->flags = rmidi->info_flags;
571 strcpy(info->id, rmidi->id);
572 strcpy(info->name, rmidi->name);
573 strcpy(info->subname, substream->name);
574 info->subdevices_count = substream->pstr->substream_count;
575 info->subdevices_avail = (substream->pstr->substream_count -
576 substream->pstr->substream_opened);
577 return 0;
578 }
579
580 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
581 struct snd_rawmidi_info __user * _info)
582 {
583 struct snd_rawmidi_info info;
584 int err;
585 if ((err = snd_rawmidi_info(substream, &info)) < 0)
586 return err;
587 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
588 return -EFAULT;
589 return 0;
590 }
591
592 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
593 {
594 struct snd_rawmidi *rmidi;
595 struct snd_rawmidi_str *pstr;
596 struct snd_rawmidi_substream *substream;
597
598 mutex_lock(&register_mutex);
599 rmidi = snd_rawmidi_search(card, info->device);
600 mutex_unlock(&register_mutex);
601 if (!rmidi)
602 return -ENXIO;
603 if (info->stream < 0 || info->stream > 1)
604 return -EINVAL;
605 pstr = &rmidi->streams[info->stream];
606 if (pstr->substream_count == 0)
607 return -ENOENT;
608 if (info->subdevice >= pstr->substream_count)
609 return -ENXIO;
610 list_for_each_entry(substream, &pstr->substreams, list) {
611 if ((unsigned int)substream->number == info->subdevice)
612 return snd_rawmidi_info(substream, info);
613 }
614 return -ENXIO;
615 }
616 EXPORT_SYMBOL(snd_rawmidi_info_select);
617
618 static int snd_rawmidi_info_select_user(struct snd_card *card,
619 struct snd_rawmidi_info __user *_info)
620 {
621 int err;
622 struct snd_rawmidi_info info;
623 if (get_user(info.device, &_info->device))
624 return -EFAULT;
625 if (get_user(info.stream, &_info->stream))
626 return -EFAULT;
627 if (get_user(info.subdevice, &_info->subdevice))
628 return -EFAULT;
629 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
630 return err;
631 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
632 return -EFAULT;
633 return 0;
634 }
635
636 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
637 struct snd_rawmidi_params * params)
638 {
639 char *newbuf;
640 struct snd_rawmidi_runtime *runtime = substream->runtime;
641
642 if (substream->append && substream->use_count > 1)
643 return -EBUSY;
644 snd_rawmidi_drain_output(substream);
645 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
646 return -EINVAL;
647 }
648 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
649 return -EINVAL;
650 }
651 if (params->buffer_size != runtime->buffer_size) {
652 newbuf = krealloc(runtime->buffer, params->buffer_size,
653 GFP_KERNEL);
654 if (!newbuf)
655 return -ENOMEM;
656 runtime->buffer = newbuf;
657 runtime->buffer_size = params->buffer_size;
658 runtime->avail = runtime->buffer_size;
659 }
660 runtime->avail_min = params->avail_min;
661 substream->active_sensing = !params->no_active_sensing;
662 return 0;
663 }
664 EXPORT_SYMBOL(snd_rawmidi_output_params);
665
666 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
667 struct snd_rawmidi_params * params)
668 {
669 char *newbuf;
670 struct snd_rawmidi_runtime *runtime = substream->runtime;
671
672 snd_rawmidi_drain_input(substream);
673 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
674 return -EINVAL;
675 }
676 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
677 return -EINVAL;
678 }
679 if (params->buffer_size != runtime->buffer_size) {
680 newbuf = krealloc(runtime->buffer, params->buffer_size,
681 GFP_KERNEL);
682 if (!newbuf)
683 return -ENOMEM;
684 runtime->buffer = newbuf;
685 runtime->buffer_size = params->buffer_size;
686 }
687 runtime->avail_min = params->avail_min;
688 return 0;
689 }
690 EXPORT_SYMBOL(snd_rawmidi_input_params);
691
692 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
693 struct snd_rawmidi_status * status)
694 {
695 struct snd_rawmidi_runtime *runtime = substream->runtime;
696
697 memset(status, 0, sizeof(*status));
698 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
699 spin_lock_irq(&runtime->lock);
700 status->avail = runtime->avail;
701 spin_unlock_irq(&runtime->lock);
702 return 0;
703 }
704
705 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
706 struct snd_rawmidi_status * status)
707 {
708 struct snd_rawmidi_runtime *runtime = substream->runtime;
709
710 memset(status, 0, sizeof(*status));
711 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
712 spin_lock_irq(&runtime->lock);
713 status->avail = runtime->avail;
714 status->xruns = runtime->xruns;
715 runtime->xruns = 0;
716 spin_unlock_irq(&runtime->lock);
717 return 0;
718 }
719
720 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
721 {
722 struct snd_rawmidi_file *rfile;
723 void __user *argp = (void __user *)arg;
724
725 rfile = file->private_data;
726 if (((cmd >> 8) & 0xff) != 'W')
727 return -ENOTTY;
728 switch (cmd) {
729 case SNDRV_RAWMIDI_IOCTL_PVERSION:
730 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
731 case SNDRV_RAWMIDI_IOCTL_INFO:
732 {
733 int stream;
734 struct snd_rawmidi_info __user *info = argp;
735 if (get_user(stream, &info->stream))
736 return -EFAULT;
737 switch (stream) {
738 case SNDRV_RAWMIDI_STREAM_INPUT:
739 return snd_rawmidi_info_user(rfile->input, info);
740 case SNDRV_RAWMIDI_STREAM_OUTPUT:
741 return snd_rawmidi_info_user(rfile->output, info);
742 default:
743 return -EINVAL;
744 }
745 }
746 case SNDRV_RAWMIDI_IOCTL_PARAMS:
747 {
748 struct snd_rawmidi_params params;
749 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
750 return -EFAULT;
751 switch (params.stream) {
752 case SNDRV_RAWMIDI_STREAM_OUTPUT:
753 if (rfile->output == NULL)
754 return -EINVAL;
755 return snd_rawmidi_output_params(rfile->output, &params);
756 case SNDRV_RAWMIDI_STREAM_INPUT:
757 if (rfile->input == NULL)
758 return -EINVAL;
759 return snd_rawmidi_input_params(rfile->input, &params);
760 default:
761 return -EINVAL;
762 }
763 }
764 case SNDRV_RAWMIDI_IOCTL_STATUS:
765 {
766 int err = 0;
767 struct snd_rawmidi_status status;
768 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
769 return -EFAULT;
770 switch (status.stream) {
771 case SNDRV_RAWMIDI_STREAM_OUTPUT:
772 if (rfile->output == NULL)
773 return -EINVAL;
774 err = snd_rawmidi_output_status(rfile->output, &status);
775 break;
776 case SNDRV_RAWMIDI_STREAM_INPUT:
777 if (rfile->input == NULL)
778 return -EINVAL;
779 err = snd_rawmidi_input_status(rfile->input, &status);
780 break;
781 default:
782 return -EINVAL;
783 }
784 if (err < 0)
785 return err;
786 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
787 return -EFAULT;
788 return 0;
789 }
790 case SNDRV_RAWMIDI_IOCTL_DROP:
791 {
792 int val;
793 if (get_user(val, (int __user *) argp))
794 return -EFAULT;
795 switch (val) {
796 case SNDRV_RAWMIDI_STREAM_OUTPUT:
797 if (rfile->output == NULL)
798 return -EINVAL;
799 return snd_rawmidi_drop_output(rfile->output);
800 default:
801 return -EINVAL;
802 }
803 }
804 case SNDRV_RAWMIDI_IOCTL_DRAIN:
805 {
806 int val;
807 if (get_user(val, (int __user *) argp))
808 return -EFAULT;
809 switch (val) {
810 case SNDRV_RAWMIDI_STREAM_OUTPUT:
811 if (rfile->output == NULL)
812 return -EINVAL;
813 return snd_rawmidi_drain_output(rfile->output);
814 case SNDRV_RAWMIDI_STREAM_INPUT:
815 if (rfile->input == NULL)
816 return -EINVAL;
817 return snd_rawmidi_drain_input(rfile->input);
818 default:
819 return -EINVAL;
820 }
821 }
822 default:
823 rmidi_dbg(rfile->rmidi,
824 "rawmidi: unknown command = 0x%x\n", cmd);
825 }
826 return -ENOTTY;
827 }
828
829 static int snd_rawmidi_control_ioctl(struct snd_card *card,
830 struct snd_ctl_file *control,
831 unsigned int cmd,
832 unsigned long arg)
833 {
834 void __user *argp = (void __user *)arg;
835
836 switch (cmd) {
837 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
838 {
839 int device;
840
841 if (get_user(device, (int __user *)argp))
842 return -EFAULT;
843 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
844 device = SNDRV_RAWMIDI_DEVICES - 1;
845 mutex_lock(&register_mutex);
846 device = device < 0 ? 0 : device + 1;
847 while (device < SNDRV_RAWMIDI_DEVICES) {
848 if (snd_rawmidi_search(card, device))
849 break;
850 device++;
851 }
852 if (device == SNDRV_RAWMIDI_DEVICES)
853 device = -1;
854 mutex_unlock(&register_mutex);
855 if (put_user(device, (int __user *)argp))
856 return -EFAULT;
857 return 0;
858 }
859 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
860 {
861 int val;
862
863 if (get_user(val, (int __user *)argp))
864 return -EFAULT;
865 control->prefer_rawmidi_subdevice = val;
866 return 0;
867 }
868 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
869 return snd_rawmidi_info_select_user(card, argp);
870 }
871 return -ENOIOCTLCMD;
872 }
873
874 /**
875 * snd_rawmidi_receive - receive the input data from the device
876 * @substream: the rawmidi substream
877 * @buffer: the buffer pointer
878 * @count: the data size to read
879 *
880 * Reads the data from the internal buffer.
881 *
882 * Return: The size of read data, or a negative error code on failure.
883 */
884 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
885 const unsigned char *buffer, int count)
886 {
887 unsigned long flags;
888 int result = 0, count1;
889 struct snd_rawmidi_runtime *runtime = substream->runtime;
890
891 if (!substream->opened)
892 return -EBADFD;
893 if (runtime->buffer == NULL) {
894 rmidi_dbg(substream->rmidi,
895 "snd_rawmidi_receive: input is not active!!!\n");
896 return -EINVAL;
897 }
898 spin_lock_irqsave(&runtime->lock, flags);
899 if (count == 1) { /* special case, faster code */
900 substream->bytes++;
901 if (runtime->avail < runtime->buffer_size) {
902 runtime->buffer[runtime->hw_ptr++] = buffer[0];
903 runtime->hw_ptr %= runtime->buffer_size;
904 runtime->avail++;
905 result++;
906 } else {
907 runtime->xruns++;
908 }
909 } else {
910 substream->bytes += count;
911 count1 = runtime->buffer_size - runtime->hw_ptr;
912 if (count1 > count)
913 count1 = count;
914 if (count1 > (int)(runtime->buffer_size - runtime->avail))
915 count1 = runtime->buffer_size - runtime->avail;
916 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
917 runtime->hw_ptr += count1;
918 runtime->hw_ptr %= runtime->buffer_size;
919 runtime->avail += count1;
920 count -= count1;
921 result += count1;
922 if (count > 0) {
923 buffer += count1;
924 count1 = count;
925 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
926 count1 = runtime->buffer_size - runtime->avail;
927 runtime->xruns += count - count1;
928 }
929 if (count1 > 0) {
930 memcpy(runtime->buffer, buffer, count1);
931 runtime->hw_ptr = count1;
932 runtime->avail += count1;
933 result += count1;
934 }
935 }
936 }
937 if (result > 0) {
938 if (runtime->event)
939 schedule_work(&runtime->event_work);
940 else if (snd_rawmidi_ready(substream))
941 wake_up(&runtime->sleep);
942 }
943 spin_unlock_irqrestore(&runtime->lock, flags);
944 return result;
945 }
946 EXPORT_SYMBOL(snd_rawmidi_receive);
947
948 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
949 unsigned char __user *userbuf,
950 unsigned char *kernelbuf, long count)
951 {
952 unsigned long flags;
953 long result = 0, count1;
954 struct snd_rawmidi_runtime *runtime = substream->runtime;
955
956 while (count > 0 && runtime->avail) {
957 count1 = runtime->buffer_size - runtime->appl_ptr;
958 if (count1 > count)
959 count1 = count;
960 spin_lock_irqsave(&runtime->lock, flags);
961 if (count1 > (int)runtime->avail)
962 count1 = runtime->avail;
963 if (kernelbuf)
964 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
965 if (userbuf) {
966 spin_unlock_irqrestore(&runtime->lock, flags);
967 if (copy_to_user(userbuf + result,
968 runtime->buffer + runtime->appl_ptr, count1)) {
969 return result > 0 ? result : -EFAULT;
970 }
971 spin_lock_irqsave(&runtime->lock, flags);
972 }
973 runtime->appl_ptr += count1;
974 runtime->appl_ptr %= runtime->buffer_size;
975 runtime->avail -= count1;
976 spin_unlock_irqrestore(&runtime->lock, flags);
977 result += count1;
978 count -= count1;
979 }
980 return result;
981 }
982
983 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
984 unsigned char *buf, long count)
985 {
986 snd_rawmidi_input_trigger(substream, 1);
987 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
988 }
989 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
990
991 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
992 loff_t *offset)
993 {
994 long result;
995 int count1;
996 struct snd_rawmidi_file *rfile;
997 struct snd_rawmidi_substream *substream;
998 struct snd_rawmidi_runtime *runtime;
999
1000 rfile = file->private_data;
1001 substream = rfile->input;
1002 if (substream == NULL)
1003 return -EIO;
1004 runtime = substream->runtime;
1005 snd_rawmidi_input_trigger(substream, 1);
1006 result = 0;
1007 while (count > 0) {
1008 spin_lock_irq(&runtime->lock);
1009 while (!snd_rawmidi_ready(substream)) {
1010 wait_queue_t wait;
1011 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1012 spin_unlock_irq(&runtime->lock);
1013 return result > 0 ? result : -EAGAIN;
1014 }
1015 init_waitqueue_entry(&wait, current);
1016 add_wait_queue(&runtime->sleep, &wait);
1017 set_current_state(TASK_INTERRUPTIBLE);
1018 spin_unlock_irq(&runtime->lock);
1019 schedule();
1020 remove_wait_queue(&runtime->sleep, &wait);
1021 if (rfile->rmidi->card->shutdown)
1022 return -ENODEV;
1023 if (signal_pending(current))
1024 return result > 0 ? result : -ERESTARTSYS;
1025 if (!runtime->avail)
1026 return result > 0 ? result : -EIO;
1027 spin_lock_irq(&runtime->lock);
1028 }
1029 spin_unlock_irq(&runtime->lock);
1030 count1 = snd_rawmidi_kernel_read1(substream,
1031 (unsigned char __user *)buf,
1032 NULL/*kernelbuf*/,
1033 count);
1034 if (count1 < 0)
1035 return result > 0 ? result : count1;
1036 result += count1;
1037 buf += count1;
1038 count -= count1;
1039 }
1040 return result;
1041 }
1042
1043 /**
1044 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1045 * @substream: the rawmidi substream
1046 *
1047 * Return: 1 if the internal output buffer is empty, 0 if not.
1048 */
1049 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1050 {
1051 struct snd_rawmidi_runtime *runtime = substream->runtime;
1052 int result;
1053 unsigned long flags;
1054
1055 if (runtime->buffer == NULL) {
1056 rmidi_dbg(substream->rmidi,
1057 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1058 return 1;
1059 }
1060 spin_lock_irqsave(&runtime->lock, flags);
1061 result = runtime->avail >= runtime->buffer_size;
1062 spin_unlock_irqrestore(&runtime->lock, flags);
1063 return result;
1064 }
1065 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1066
1067 /**
1068 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1069 * @substream: the rawmidi substream
1070 * @buffer: the buffer pointer
1071 * @count: data size to transfer
1072 *
1073 * Copies data from the internal output buffer to the given buffer.
1074 *
1075 * Call this in the interrupt handler when the midi output is ready,
1076 * and call snd_rawmidi_transmit_ack() after the transmission is
1077 * finished.
1078 *
1079 * Return: The size of copied data, or a negative error code on failure.
1080 */
1081 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1082 unsigned char *buffer, int count)
1083 {
1084 unsigned long flags;
1085 int result, count1;
1086 struct snd_rawmidi_runtime *runtime = substream->runtime;
1087
1088 if (runtime->buffer == NULL) {
1089 rmidi_dbg(substream->rmidi,
1090 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1091 return -EINVAL;
1092 }
1093 result = 0;
1094 spin_lock_irqsave(&runtime->lock, flags);
1095 if (runtime->avail >= runtime->buffer_size) {
1096 /* warning: lowlevel layer MUST trigger down the hardware */
1097 goto __skip;
1098 }
1099 if (count == 1) { /* special case, faster code */
1100 *buffer = runtime->buffer[runtime->hw_ptr];
1101 result++;
1102 } else {
1103 count1 = runtime->buffer_size - runtime->hw_ptr;
1104 if (count1 > count)
1105 count1 = count;
1106 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1107 count1 = runtime->buffer_size - runtime->avail;
1108 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1109 count -= count1;
1110 result += count1;
1111 if (count > 0) {
1112 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1113 count = runtime->buffer_size - runtime->avail - count1;
1114 memcpy(buffer + count1, runtime->buffer, count);
1115 result += count;
1116 }
1117 }
1118 __skip:
1119 spin_unlock_irqrestore(&runtime->lock, flags);
1120 return result;
1121 }
1122 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1123
1124 /**
1125 * snd_rawmidi_transmit_ack - acknowledge the transmission
1126 * @substream: the rawmidi substream
1127 * @count: the transferred count
1128 *
1129 * Advances the hardware pointer for the internal output buffer with
1130 * the given size and updates the condition.
1131 * Call after the transmission is finished.
1132 *
1133 * Return: The advanced size if successful, or a negative error code on failure.
1134 */
1135 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1136 {
1137 unsigned long flags;
1138 struct snd_rawmidi_runtime *runtime = substream->runtime;
1139
1140 if (runtime->buffer == NULL) {
1141 rmidi_dbg(substream->rmidi,
1142 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1143 return -EINVAL;
1144 }
1145 spin_lock_irqsave(&runtime->lock, flags);
1146 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1147 runtime->hw_ptr += count;
1148 runtime->hw_ptr %= runtime->buffer_size;
1149 runtime->avail += count;
1150 substream->bytes += count;
1151 if (count > 0) {
1152 if (runtime->drain || snd_rawmidi_ready(substream))
1153 wake_up(&runtime->sleep);
1154 }
1155 spin_unlock_irqrestore(&runtime->lock, flags);
1156 return count;
1157 }
1158 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1159
1160 /**
1161 * snd_rawmidi_transmit - copy from the buffer to the device
1162 * @substream: the rawmidi substream
1163 * @buffer: the buffer pointer
1164 * @count: the data size to transfer
1165 *
1166 * Copies data from the buffer to the device and advances the pointer.
1167 *
1168 * Return: The copied size if successful, or a negative error code on failure.
1169 */
1170 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1171 unsigned char *buffer, int count)
1172 {
1173 if (!substream->opened)
1174 return -EBADFD;
1175 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1176 if (count < 0)
1177 return count;
1178 return snd_rawmidi_transmit_ack(substream, count);
1179 }
1180 EXPORT_SYMBOL(snd_rawmidi_transmit);
1181
1182 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1183 const unsigned char __user *userbuf,
1184 const unsigned char *kernelbuf,
1185 long count)
1186 {
1187 unsigned long flags;
1188 long count1, result;
1189 struct snd_rawmidi_runtime *runtime = substream->runtime;
1190
1191 if (snd_BUG_ON(!kernelbuf && !userbuf))
1192 return -EINVAL;
1193 if (snd_BUG_ON(!runtime->buffer))
1194 return -EINVAL;
1195
1196 result = 0;
1197 spin_lock_irqsave(&runtime->lock, flags);
1198 if (substream->append) {
1199 if ((long)runtime->avail < count) {
1200 spin_unlock_irqrestore(&runtime->lock, flags);
1201 return -EAGAIN;
1202 }
1203 }
1204 while (count > 0 && runtime->avail > 0) {
1205 count1 = runtime->buffer_size - runtime->appl_ptr;
1206 if (count1 > count)
1207 count1 = count;
1208 if (count1 > (long)runtime->avail)
1209 count1 = runtime->avail;
1210 if (kernelbuf)
1211 memcpy(runtime->buffer + runtime->appl_ptr,
1212 kernelbuf + result, count1);
1213 else if (userbuf) {
1214 spin_unlock_irqrestore(&runtime->lock, flags);
1215 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1216 userbuf + result, count1)) {
1217 spin_lock_irqsave(&runtime->lock, flags);
1218 result = result > 0 ? result : -EFAULT;
1219 goto __end;
1220 }
1221 spin_lock_irqsave(&runtime->lock, flags);
1222 }
1223 runtime->appl_ptr += count1;
1224 runtime->appl_ptr %= runtime->buffer_size;
1225 runtime->avail -= count1;
1226 result += count1;
1227 count -= count1;
1228 }
1229 __end:
1230 count1 = runtime->avail < runtime->buffer_size;
1231 spin_unlock_irqrestore(&runtime->lock, flags);
1232 if (count1)
1233 snd_rawmidi_output_trigger(substream, 1);
1234 return result;
1235 }
1236
1237 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1238 const unsigned char *buf, long count)
1239 {
1240 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1241 }
1242 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1243
1244 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1245 size_t count, loff_t *offset)
1246 {
1247 long result, timeout;
1248 int count1;
1249 struct snd_rawmidi_file *rfile;
1250 struct snd_rawmidi_runtime *runtime;
1251 struct snd_rawmidi_substream *substream;
1252
1253 rfile = file->private_data;
1254 substream = rfile->output;
1255 runtime = substream->runtime;
1256 /* we cannot put an atomic message to our buffer */
1257 if (substream->append && count > runtime->buffer_size)
1258 return -EIO;
1259 result = 0;
1260 while (count > 0) {
1261 spin_lock_irq(&runtime->lock);
1262 while (!snd_rawmidi_ready_append(substream, count)) {
1263 wait_queue_t wait;
1264 if (file->f_flags & O_NONBLOCK) {
1265 spin_unlock_irq(&runtime->lock);
1266 return result > 0 ? result : -EAGAIN;
1267 }
1268 init_waitqueue_entry(&wait, current);
1269 add_wait_queue(&runtime->sleep, &wait);
1270 set_current_state(TASK_INTERRUPTIBLE);
1271 spin_unlock_irq(&runtime->lock);
1272 timeout = schedule_timeout(30 * HZ);
1273 remove_wait_queue(&runtime->sleep, &wait);
1274 if (rfile->rmidi->card->shutdown)
1275 return -ENODEV;
1276 if (signal_pending(current))
1277 return result > 0 ? result : -ERESTARTSYS;
1278 if (!runtime->avail && !timeout)
1279 return result > 0 ? result : -EIO;
1280 spin_lock_irq(&runtime->lock);
1281 }
1282 spin_unlock_irq(&runtime->lock);
1283 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1284 if (count1 < 0)
1285 return result > 0 ? result : count1;
1286 result += count1;
1287 buf += count1;
1288 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1289 break;
1290 count -= count1;
1291 }
1292 if (file->f_flags & O_DSYNC) {
1293 spin_lock_irq(&runtime->lock);
1294 while (runtime->avail != runtime->buffer_size) {
1295 wait_queue_t wait;
1296 unsigned int last_avail = runtime->avail;
1297 init_waitqueue_entry(&wait, current);
1298 add_wait_queue(&runtime->sleep, &wait);
1299 set_current_state(TASK_INTERRUPTIBLE);
1300 spin_unlock_irq(&runtime->lock);
1301 timeout = schedule_timeout(30 * HZ);
1302 remove_wait_queue(&runtime->sleep, &wait);
1303 if (signal_pending(current))
1304 return result > 0 ? result : -ERESTARTSYS;
1305 if (runtime->avail == last_avail && !timeout)
1306 return result > 0 ? result : -EIO;
1307 spin_lock_irq(&runtime->lock);
1308 }
1309 spin_unlock_irq(&runtime->lock);
1310 }
1311 return result;
1312 }
1313
1314 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1315 {
1316 struct snd_rawmidi_file *rfile;
1317 struct snd_rawmidi_runtime *runtime;
1318 unsigned int mask;
1319
1320 rfile = file->private_data;
1321 if (rfile->input != NULL) {
1322 runtime = rfile->input->runtime;
1323 snd_rawmidi_input_trigger(rfile->input, 1);
1324 poll_wait(file, &runtime->sleep, wait);
1325 }
1326 if (rfile->output != NULL) {
1327 runtime = rfile->output->runtime;
1328 poll_wait(file, &runtime->sleep, wait);
1329 }
1330 mask = 0;
1331 if (rfile->input != NULL) {
1332 if (snd_rawmidi_ready(rfile->input))
1333 mask |= POLLIN | POLLRDNORM;
1334 }
1335 if (rfile->output != NULL) {
1336 if (snd_rawmidi_ready(rfile->output))
1337 mask |= POLLOUT | POLLWRNORM;
1338 }
1339 return mask;
1340 }
1341
1342 /*
1343 */
1344 #ifdef CONFIG_COMPAT
1345 #include "rawmidi_compat.c"
1346 #else
1347 #define snd_rawmidi_ioctl_compat NULL
1348 #endif
1349
1350 /*
1351
1352 */
1353
1354 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1355 struct snd_info_buffer *buffer)
1356 {
1357 struct snd_rawmidi *rmidi;
1358 struct snd_rawmidi_substream *substream;
1359 struct snd_rawmidi_runtime *runtime;
1360
1361 rmidi = entry->private_data;
1362 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1363 mutex_lock(&rmidi->open_mutex);
1364 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1365 list_for_each_entry(substream,
1366 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1367 list) {
1368 snd_iprintf(buffer,
1369 "Output %d\n"
1370 " Tx bytes : %lu\n",
1371 substream->number,
1372 (unsigned long) substream->bytes);
1373 if (substream->opened) {
1374 snd_iprintf(buffer,
1375 " Owner PID : %d\n",
1376 pid_vnr(substream->pid));
1377 runtime = substream->runtime;
1378 snd_iprintf(buffer,
1379 " Mode : %s\n"
1380 " Buffer size : %lu\n"
1381 " Avail : %lu\n",
1382 runtime->oss ? "OSS compatible" : "native",
1383 (unsigned long) runtime->buffer_size,
1384 (unsigned long) runtime->avail);
1385 }
1386 }
1387 }
1388 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1389 list_for_each_entry(substream,
1390 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1391 list) {
1392 snd_iprintf(buffer,
1393 "Input %d\n"
1394 " Rx bytes : %lu\n",
1395 substream->number,
1396 (unsigned long) substream->bytes);
1397 if (substream->opened) {
1398 snd_iprintf(buffer,
1399 " Owner PID : %d\n",
1400 pid_vnr(substream->pid));
1401 runtime = substream->runtime;
1402 snd_iprintf(buffer,
1403 " Buffer size : %lu\n"
1404 " Avail : %lu\n"
1405 " Overruns : %lu\n",
1406 (unsigned long) runtime->buffer_size,
1407 (unsigned long) runtime->avail,
1408 (unsigned long) runtime->xruns);
1409 }
1410 }
1411 }
1412 mutex_unlock(&rmidi->open_mutex);
1413 }
1414
1415 /*
1416 * Register functions
1417 */
1418
1419 static const struct file_operations snd_rawmidi_f_ops =
1420 {
1421 .owner = THIS_MODULE,
1422 .read = snd_rawmidi_read,
1423 .write = snd_rawmidi_write,
1424 .open = snd_rawmidi_open,
1425 .release = snd_rawmidi_release,
1426 .llseek = no_llseek,
1427 .poll = snd_rawmidi_poll,
1428 .unlocked_ioctl = snd_rawmidi_ioctl,
1429 .compat_ioctl = snd_rawmidi_ioctl_compat,
1430 };
1431
1432 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1433 struct snd_rawmidi_str *stream,
1434 int direction,
1435 int count)
1436 {
1437 struct snd_rawmidi_substream *substream;
1438 int idx;
1439
1440 for (idx = 0; idx < count; idx++) {
1441 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1442 if (substream == NULL) {
1443 rmidi_err(rmidi, "rawmidi: cannot allocate substream\n");
1444 return -ENOMEM;
1445 }
1446 substream->stream = direction;
1447 substream->number = idx;
1448 substream->rmidi = rmidi;
1449 substream->pstr = stream;
1450 list_add_tail(&substream->list, &stream->substreams);
1451 stream->substream_count++;
1452 }
1453 return 0;
1454 }
1455
1456 /**
1457 * snd_rawmidi_new - create a rawmidi instance
1458 * @card: the card instance
1459 * @id: the id string
1460 * @device: the device index
1461 * @output_count: the number of output streams
1462 * @input_count: the number of input streams
1463 * @rrawmidi: the pointer to store the new rawmidi instance
1464 *
1465 * Creates a new rawmidi instance.
1466 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1467 *
1468 * Return: Zero if successful, or a negative error code on failure.
1469 */
1470 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1471 int output_count, int input_count,
1472 struct snd_rawmidi ** rrawmidi)
1473 {
1474 struct snd_rawmidi *rmidi;
1475 int err;
1476 static struct snd_device_ops ops = {
1477 .dev_free = snd_rawmidi_dev_free,
1478 .dev_register = snd_rawmidi_dev_register,
1479 .dev_disconnect = snd_rawmidi_dev_disconnect,
1480 };
1481
1482 if (snd_BUG_ON(!card))
1483 return -ENXIO;
1484 if (rrawmidi)
1485 *rrawmidi = NULL;
1486 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1487 if (rmidi == NULL) {
1488 dev_err(card->dev, "rawmidi: cannot allocate\n");
1489 return -ENOMEM;
1490 }
1491 rmidi->card = card;
1492 rmidi->device = device;
1493 mutex_init(&rmidi->open_mutex);
1494 init_waitqueue_head(&rmidi->open_wait);
1495 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1496 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1497
1498 if (id != NULL)
1499 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1500 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1501 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1502 SNDRV_RAWMIDI_STREAM_INPUT,
1503 input_count)) < 0) {
1504 snd_rawmidi_free(rmidi);
1505 return err;
1506 }
1507 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1508 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1509 SNDRV_RAWMIDI_STREAM_OUTPUT,
1510 output_count)) < 0) {
1511 snd_rawmidi_free(rmidi);
1512 return err;
1513 }
1514 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1515 snd_rawmidi_free(rmidi);
1516 return err;
1517 }
1518 if (rrawmidi)
1519 *rrawmidi = rmidi;
1520 return 0;
1521 }
1522 EXPORT_SYMBOL(snd_rawmidi_new);
1523
1524 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1525 {
1526 struct snd_rawmidi_substream *substream;
1527
1528 while (!list_empty(&stream->substreams)) {
1529 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1530 list_del(&substream->list);
1531 kfree(substream);
1532 }
1533 }
1534
1535 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1536 {
1537 if (!rmidi)
1538 return 0;
1539
1540 snd_info_free_entry(rmidi->proc_entry);
1541 rmidi->proc_entry = NULL;
1542 mutex_lock(&register_mutex);
1543 if (rmidi->ops && rmidi->ops->dev_unregister)
1544 rmidi->ops->dev_unregister(rmidi);
1545 mutex_unlock(&register_mutex);
1546
1547 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1548 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1549 if (rmidi->private_free)
1550 rmidi->private_free(rmidi);
1551 kfree(rmidi);
1552 return 0;
1553 }
1554
1555 static int snd_rawmidi_dev_free(struct snd_device *device)
1556 {
1557 struct snd_rawmidi *rmidi = device->device_data;
1558 return snd_rawmidi_free(rmidi);
1559 }
1560
1561 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1562 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1563 {
1564 struct snd_rawmidi *rmidi = device->private_data;
1565 rmidi->seq_dev = NULL;
1566 }
1567 #endif
1568
1569 static int snd_rawmidi_dev_register(struct snd_device *device)
1570 {
1571 int err;
1572 struct snd_info_entry *entry;
1573 char name[16];
1574 struct snd_rawmidi *rmidi = device->device_data;
1575
1576 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1577 return -ENOMEM;
1578 mutex_lock(&register_mutex);
1579 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1580 mutex_unlock(&register_mutex);
1581 return -EBUSY;
1582 }
1583 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1584 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1585 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1586 rmidi->card, rmidi->device,
1587 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1588 rmidi_err(rmidi, "unable to register rawmidi device %i:%i\n",
1589 rmidi->card->number, rmidi->device);
1590 list_del(&rmidi->list);
1591 mutex_unlock(&register_mutex);
1592 return err;
1593 }
1594 if (rmidi->ops && rmidi->ops->dev_register &&
1595 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1596 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1597 list_del(&rmidi->list);
1598 mutex_unlock(&register_mutex);
1599 return err;
1600 }
1601 #ifdef CONFIG_SND_OSSEMUL
1602 rmidi->ossreg = 0;
1603 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1604 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1605 rmidi->card, 0, &snd_rawmidi_f_ops,
1606 rmidi) < 0) {
1607 rmidi_err(rmidi,
1608 "unable to register OSS rawmidi device %i:%i\n",
1609 rmidi->card->number, 0);
1610 } else {
1611 rmidi->ossreg++;
1612 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1613 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1614 #endif
1615 }
1616 }
1617 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1618 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1619 rmidi->card, 1, &snd_rawmidi_f_ops,
1620 rmidi) < 0) {
1621 rmidi_err(rmidi,
1622 "unable to register OSS rawmidi device %i:%i\n",
1623 rmidi->card->number, 1);
1624 } else {
1625 rmidi->ossreg++;
1626 }
1627 }
1628 #endif /* CONFIG_SND_OSSEMUL */
1629 mutex_unlock(&register_mutex);
1630 sprintf(name, "midi%d", rmidi->device);
1631 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1632 if (entry) {
1633 entry->private_data = rmidi;
1634 entry->c.text.read = snd_rawmidi_proc_info_read;
1635 if (snd_info_register(entry) < 0) {
1636 snd_info_free_entry(entry);
1637 entry = NULL;
1638 }
1639 }
1640 rmidi->proc_entry = entry;
1641 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1642 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1643 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1644 rmidi->seq_dev->private_data = rmidi;
1645 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1646 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1647 snd_device_register(rmidi->card, rmidi->seq_dev);
1648 }
1649 }
1650 #endif
1651 return 0;
1652 }
1653
1654 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1655 {
1656 struct snd_rawmidi *rmidi = device->device_data;
1657 int dir;
1658
1659 mutex_lock(&register_mutex);
1660 mutex_lock(&rmidi->open_mutex);
1661 wake_up(&rmidi->open_wait);
1662 list_del_init(&rmidi->list);
1663 for (dir = 0; dir < 2; dir++) {
1664 struct snd_rawmidi_substream *s;
1665 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1666 if (s->runtime)
1667 wake_up(&s->runtime->sleep);
1668 }
1669 }
1670
1671 #ifdef CONFIG_SND_OSSEMUL
1672 if (rmidi->ossreg) {
1673 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1674 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1675 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1676 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1677 #endif
1678 }
1679 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1680 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1681 rmidi->ossreg = 0;
1682 }
1683 #endif /* CONFIG_SND_OSSEMUL */
1684 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1685 mutex_unlock(&rmidi->open_mutex);
1686 mutex_unlock(&register_mutex);
1687 return 0;
1688 }
1689
1690 /**
1691 * snd_rawmidi_set_ops - set the rawmidi operators
1692 * @rmidi: the rawmidi instance
1693 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1694 * @ops: the operator table
1695 *
1696 * Sets the rawmidi operators for the given stream direction.
1697 */
1698 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1699 struct snd_rawmidi_ops *ops)
1700 {
1701 struct snd_rawmidi_substream *substream;
1702
1703 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1704 substream->ops = ops;
1705 }
1706 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1707
1708 /*
1709 * ENTRY functions
1710 */
1711
1712 static int __init alsa_rawmidi_init(void)
1713 {
1714
1715 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1716 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1717 #ifdef CONFIG_SND_OSSEMUL
1718 { int i;
1719 /* check device map table */
1720 for (i = 0; i < SNDRV_CARDS; i++) {
1721 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1722 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1723 i, midi_map[i]);
1724 midi_map[i] = 0;
1725 }
1726 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1727 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1728 i, amidi_map[i]);
1729 amidi_map[i] = 1;
1730 }
1731 }
1732 }
1733 #endif /* CONFIG_SND_OSSEMUL */
1734 return 0;
1735 }
1736
1737 static void __exit alsa_rawmidi_exit(void)
1738 {
1739 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1740 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1741 }
1742
1743 module_init(alsa_rawmidi_init)
1744 module_exit(alsa_rawmidi_exit)
Linux kernel - Deliverables
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