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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
38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40MODULE_LICENSE("GPL");
41
42#ifdef CONFIG_SND_OSSEMUL
43static int midi_map[SNDRV_CARDS];
44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45module_param_array(midi_map, int, NULL, 0444);
46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47module_param_array(amidi_map, int, NULL, 0444);
48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49#endif /* CONFIG_SND_OSSEMUL */
50
51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52static int snd_rawmidi_dev_free(struct snd_device *device);
53static int snd_rawmidi_dev_register(struct snd_device *device);
54static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56static LIST_HEAD(snd_rawmidi_devices);
57static DEFINE_MUTEX(register_mutex);
58
59#define rmidi_err(rmidi, fmt, args...) \
60 dev_err(&(rmidi)->dev, fmt, ##args)
61#define rmidi_warn(rmidi, fmt, args...) \
62 dev_warn(&(rmidi)->dev, fmt, ##args)
63#define rmidi_dbg(rmidi, fmt, args...) \
64 dev_dbg(&(rmidi)->dev, fmt, ##args)
65
66static 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
76static 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
88static 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
94static 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
102static 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
110static 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
136static 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
146static 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
153static 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
162int 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}
175EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177int 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}
207EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209int 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}
222EXPORT_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 */
227static 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 */
259static 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
285static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289static 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 */
332int 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(®ister_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(®ister_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(®ister_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(®ister_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}
360EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362static 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
373 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
374 return -EINVAL; /* invalid combination */
375
376 err = nonseekable_open(inode, file);
377 if (err < 0)
378 return err;
379
380 if (maj == snd_major) {
381 rmidi = snd_lookup_minor_data(iminor(inode),
382 SNDRV_DEVICE_TYPE_RAWMIDI);
383#ifdef CONFIG_SND_OSSEMUL
384 } else if (maj == SOUND_MAJOR) {
385 rmidi = snd_lookup_oss_minor_data(iminor(inode),
386 SNDRV_OSS_DEVICE_TYPE_MIDI);
387#endif
388 } else
389 return -ENXIO;
390
391 if (rmidi == NULL)
392 return -ENODEV;
393
394 if (!try_module_get(rmidi->card->module)) {
395 snd_card_unref(rmidi->card);
396 return -ENXIO;
397 }
398
399 mutex_lock(&rmidi->open_mutex);
400 card = rmidi->card;
401 err = snd_card_file_add(card, file);
402 if (err < 0)
403 goto __error_card;
404 fflags = snd_rawmidi_file_flags(file);
405 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
406 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
407 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
408 if (rawmidi_file == NULL) {
409 err = -ENOMEM;
410 goto __error;
411 }
412 init_waitqueue_entry(&wait, current);
413 add_wait_queue(&rmidi->open_wait, &wait);
414 while (1) {
415 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
416 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
417 if (err >= 0)
418 break;
419 if (err == -EAGAIN) {
420 if (file->f_flags & O_NONBLOCK) {
421 err = -EBUSY;
422 break;
423 }
424 } else
425 break;
426 set_current_state(TASK_INTERRUPTIBLE);
427 mutex_unlock(&rmidi->open_mutex);
428 schedule();
429 mutex_lock(&rmidi->open_mutex);
430 if (rmidi->card->shutdown) {
431 err = -ENODEV;
432 break;
433 }
434 if (signal_pending(current)) {
435 err = -ERESTARTSYS;
436 break;
437 }
438 }
439 remove_wait_queue(&rmidi->open_wait, &wait);
440 if (err < 0) {
441 kfree(rawmidi_file);
442 goto __error;
443 }
444#ifdef CONFIG_SND_OSSEMUL
445 if (rawmidi_file->input && rawmidi_file->input->runtime)
446 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
447 if (rawmidi_file->output && rawmidi_file->output->runtime)
448 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
449#endif
450 file->private_data = rawmidi_file;
451 mutex_unlock(&rmidi->open_mutex);
452 snd_card_unref(rmidi->card);
453 return 0;
454
455 __error:
456 snd_card_file_remove(card, file);
457 __error_card:
458 mutex_unlock(&rmidi->open_mutex);
459 module_put(rmidi->card->module);
460 snd_card_unref(rmidi->card);
461 return err;
462}
463
464static void close_substream(struct snd_rawmidi *rmidi,
465 struct snd_rawmidi_substream *substream,
466 int cleanup)
467{
468 if (--substream->use_count)
469 return;
470
471 if (cleanup) {
472 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
473 snd_rawmidi_input_trigger(substream, 0);
474 else {
475 if (substream->active_sensing) {
476 unsigned char buf = 0xfe;
477 /* sending single active sensing message
478 * to shut the device up
479 */
480 snd_rawmidi_kernel_write(substream, &buf, 1);
481 }
482 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
483 snd_rawmidi_output_trigger(substream, 0);
484 }
485 }
486 substream->ops->close(substream);
487 if (substream->runtime->private_free)
488 substream->runtime->private_free(substream);
489 snd_rawmidi_runtime_free(substream);
490 substream->opened = 0;
491 substream->append = 0;
492 put_pid(substream->pid);
493 substream->pid = NULL;
494 rmidi->streams[substream->stream].substream_opened--;
495}
496
497static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
498{
499 struct snd_rawmidi *rmidi;
500
501 rmidi = rfile->rmidi;
502 mutex_lock(&rmidi->open_mutex);
503 if (rfile->input) {
504 close_substream(rmidi, rfile->input, 1);
505 rfile->input = NULL;
506 }
507 if (rfile->output) {
508 close_substream(rmidi, rfile->output, 1);
509 rfile->output = NULL;
510 }
511 rfile->rmidi = NULL;
512 mutex_unlock(&rmidi->open_mutex);
513 wake_up(&rmidi->open_wait);
514}
515
516/* called from sound/core/seq/seq_midi.c */
517int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
518{
519 struct snd_rawmidi *rmidi;
520
521 if (snd_BUG_ON(!rfile))
522 return -ENXIO;
523
524 rmidi = rfile->rmidi;
525 rawmidi_release_priv(rfile);
526 module_put(rmidi->card->module);
527 return 0;
528}
529EXPORT_SYMBOL(snd_rawmidi_kernel_release);
530
531static int snd_rawmidi_release(struct inode *inode, struct file *file)
532{
533 struct snd_rawmidi_file *rfile;
534 struct snd_rawmidi *rmidi;
535 struct module *module;
536
537 rfile = file->private_data;
538 rmidi = rfile->rmidi;
539 rawmidi_release_priv(rfile);
540 kfree(rfile);
541 module = rmidi->card->module;
542 snd_card_file_remove(rmidi->card, file);
543 module_put(module);
544 return 0;
545}
546
547static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
548 struct snd_rawmidi_info *info)
549{
550 struct snd_rawmidi *rmidi;
551
552 if (substream == NULL)
553 return -ENODEV;
554 rmidi = substream->rmidi;
555 memset(info, 0, sizeof(*info));
556 info->card = rmidi->card->number;
557 info->device = rmidi->device;
558 info->subdevice = substream->number;
559 info->stream = substream->stream;
560 info->flags = rmidi->info_flags;
561 strcpy(info->id, rmidi->id);
562 strcpy(info->name, rmidi->name);
563 strcpy(info->subname, substream->name);
564 info->subdevices_count = substream->pstr->substream_count;
565 info->subdevices_avail = (substream->pstr->substream_count -
566 substream->pstr->substream_opened);
567 return 0;
568}
569
570static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
571 struct snd_rawmidi_info __user * _info)
572{
573 struct snd_rawmidi_info info;
574 int err;
575 if ((err = snd_rawmidi_info(substream, &info)) < 0)
576 return err;
577 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
578 return -EFAULT;
579 return 0;
580}
581
582int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
583{
584 struct snd_rawmidi *rmidi;
585 struct snd_rawmidi_str *pstr;
586 struct snd_rawmidi_substream *substream;
587
588 mutex_lock(®ister_mutex);
589 rmidi = snd_rawmidi_search(card, info->device);
590 mutex_unlock(®ister_mutex);
591 if (!rmidi)
592 return -ENXIO;
593 if (info->stream < 0 || info->stream > 1)
594 return -EINVAL;
595 pstr = &rmidi->streams[info->stream];
596 if (pstr->substream_count == 0)
597 return -ENOENT;
598 if (info->subdevice >= pstr->substream_count)
599 return -ENXIO;
600 list_for_each_entry(substream, &pstr->substreams, list) {
601 if ((unsigned int)substream->number == info->subdevice)
602 return snd_rawmidi_info(substream, info);
603 }
604 return -ENXIO;
605}
606EXPORT_SYMBOL(snd_rawmidi_info_select);
607
608static int snd_rawmidi_info_select_user(struct snd_card *card,
609 struct snd_rawmidi_info __user *_info)
610{
611 int err;
612 struct snd_rawmidi_info info;
613 if (get_user(info.device, &_info->device))
614 return -EFAULT;
615 if (get_user(info.stream, &_info->stream))
616 return -EFAULT;
617 if (get_user(info.subdevice, &_info->subdevice))
618 return -EFAULT;
619 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
620 return err;
621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
622 return -EFAULT;
623 return 0;
624}
625
626int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
627 struct snd_rawmidi_params * params)
628{
629 char *newbuf;
630 struct snd_rawmidi_runtime *runtime = substream->runtime;
631
632 if (substream->append && substream->use_count > 1)
633 return -EBUSY;
634 snd_rawmidi_drain_output(substream);
635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
636 return -EINVAL;
637 }
638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
639 return -EINVAL;
640 }
641 if (params->buffer_size != runtime->buffer_size) {
642 newbuf = krealloc(runtime->buffer, params->buffer_size,
643 GFP_KERNEL);
644 if (!newbuf)
645 return -ENOMEM;
646 runtime->buffer = newbuf;
647 runtime->buffer_size = params->buffer_size;
648 runtime->avail = runtime->buffer_size;
649 }
650 runtime->avail_min = params->avail_min;
651 substream->active_sensing = !params->no_active_sensing;
652 return 0;
653}
654EXPORT_SYMBOL(snd_rawmidi_output_params);
655
656int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
657 struct snd_rawmidi_params * params)
658{
659 char *newbuf;
660 struct snd_rawmidi_runtime *runtime = substream->runtime;
661
662 snd_rawmidi_drain_input(substream);
663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
664 return -EINVAL;
665 }
666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
667 return -EINVAL;
668 }
669 if (params->buffer_size != runtime->buffer_size) {
670 newbuf = krealloc(runtime->buffer, params->buffer_size,
671 GFP_KERNEL);
672 if (!newbuf)
673 return -ENOMEM;
674 runtime->buffer = newbuf;
675 runtime->buffer_size = params->buffer_size;
676 }
677 runtime->avail_min = params->avail_min;
678 return 0;
679}
680EXPORT_SYMBOL(snd_rawmidi_input_params);
681
682static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683 struct snd_rawmidi_status * status)
684{
685 struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687 memset(status, 0, sizeof(*status));
688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693}
694
695static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696 struct snd_rawmidi_status * status)
697{
698 struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700 memset(status, 0, sizeof(*status));
701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702 spin_lock_irq(&runtime->lock);
703 status->avail = runtime->avail;
704 status->xruns = runtime->xruns;
705 runtime->xruns = 0;
706 spin_unlock_irq(&runtime->lock);
707 return 0;
708}
709
710static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711{
712 struct snd_rawmidi_file *rfile;
713 void __user *argp = (void __user *)arg;
714
715 rfile = file->private_data;
716 if (((cmd >> 8) & 0xff) != 'W')
717 return -ENOTTY;
718 switch (cmd) {
719 case SNDRV_RAWMIDI_IOCTL_PVERSION:
720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721 case SNDRV_RAWMIDI_IOCTL_INFO:
722 {
723 int stream;
724 struct snd_rawmidi_info __user *info = argp;
725 if (get_user(stream, &info->stream))
726 return -EFAULT;
727 switch (stream) {
728 case SNDRV_RAWMIDI_STREAM_INPUT:
729 return snd_rawmidi_info_user(rfile->input, info);
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 return snd_rawmidi_info_user(rfile->output, info);
732 default:
733 return -EINVAL;
734 }
735 }
736 case SNDRV_RAWMIDI_IOCTL_PARAMS:
737 {
738 struct snd_rawmidi_params params;
739 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
740 return -EFAULT;
741 switch (params.stream) {
742 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743 if (rfile->output == NULL)
744 return -EINVAL;
745 return snd_rawmidi_output_params(rfile->output, ¶ms);
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 return snd_rawmidi_input_params(rfile->input, ¶ms);
750 default:
751 return -EINVAL;
752 }
753 }
754 case SNDRV_RAWMIDI_IOCTL_STATUS:
755 {
756 int err = 0;
757 struct snd_rawmidi_status status;
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759 return -EFAULT;
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
763 return -EINVAL;
764 err = snd_rawmidi_output_status(rfile->output, &status);
765 break;
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
768 return -EINVAL;
769 err = snd_rawmidi_input_status(rfile->input, &status);
770 break;
771 default:
772 return -EINVAL;
773 }
774 if (err < 0)
775 return err;
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
783 if (get_user(val, (int __user *) argp))
784 return -EFAULT;
785 switch (val) {
786 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787 if (rfile->output == NULL)
788 return -EINVAL;
789 return snd_rawmidi_drop_output(rfile->output);
790 default:
791 return -EINVAL;
792 }
793 }
794 case SNDRV_RAWMIDI_IOCTL_DRAIN:
795 {
796 int val;
797 if (get_user(val, (int __user *) argp))
798 return -EFAULT;
799 switch (val) {
800 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801 if (rfile->output == NULL)
802 return -EINVAL;
803 return snd_rawmidi_drain_output(rfile->output);
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 return snd_rawmidi_drain_input(rfile->input);
808 default:
809 return -EINVAL;
810 }
811 }
812 default:
813 rmidi_dbg(rfile->rmidi,
814 "rawmidi: unknown command = 0x%x\n", cmd);
815 }
816 return -ENOTTY;
817}
818
819static int snd_rawmidi_control_ioctl(struct snd_card *card,
820 struct snd_ctl_file *control,
821 unsigned int cmd,
822 unsigned long arg)
823{
824 void __user *argp = (void __user *)arg;
825
826 switch (cmd) {
827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
828 {
829 int device;
830
831 if (get_user(device, (int __user *)argp))
832 return -EFAULT;
833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
834 device = SNDRV_RAWMIDI_DEVICES - 1;
835 mutex_lock(®ister_mutex);
836 device = device < 0 ? 0 : device + 1;
837 while (device < SNDRV_RAWMIDI_DEVICES) {
838 if (snd_rawmidi_search(card, device))
839 break;
840 device++;
841 }
842 if (device == SNDRV_RAWMIDI_DEVICES)
843 device = -1;
844 mutex_unlock(®ister_mutex);
845 if (put_user(device, (int __user *)argp))
846 return -EFAULT;
847 return 0;
848 }
849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
850 {
851 int val;
852
853 if (get_user(val, (int __user *)argp))
854 return -EFAULT;
855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
859 return snd_rawmidi_info_select_user(card, argp);
860 }
861 return -ENOIOCTLCMD;
862}
863
864/**
865 * snd_rawmidi_receive - receive the input data from the device
866 * @substream: the rawmidi substream
867 * @buffer: the buffer pointer
868 * @count: the data size to read
869 *
870 * Reads the data from the internal buffer.
871 *
872 * Return: The size of read data, or a negative error code on failure.
873 */
874int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
875 const unsigned char *buffer, int count)
876{
877 unsigned long flags;
878 int result = 0, count1;
879 struct snd_rawmidi_runtime *runtime = substream->runtime;
880
881 if (!substream->opened)
882 return -EBADFD;
883 if (runtime->buffer == NULL) {
884 rmidi_dbg(substream->rmidi,
885 "snd_rawmidi_receive: input is not active!!!\n");
886 return -EINVAL;
887 }
888 spin_lock_irqsave(&runtime->lock, flags);
889 if (count == 1) { /* special case, faster code */
890 substream->bytes++;
891 if (runtime->avail < runtime->buffer_size) {
892 runtime->buffer[runtime->hw_ptr++] = buffer[0];
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail++;
895 result++;
896 } else {
897 runtime->xruns++;
898 }
899 } else {
900 substream->bytes += count;
901 count1 = runtime->buffer_size - runtime->hw_ptr;
902 if (count1 > count)
903 count1 = count;
904 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905 count1 = runtime->buffer_size - runtime->avail;
906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907 runtime->hw_ptr += count1;
908 runtime->hw_ptr %= runtime->buffer_size;
909 runtime->avail += count1;
910 count -= count1;
911 result += count1;
912 if (count > 0) {
913 buffer += count1;
914 count1 = count;
915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916 count1 = runtime->buffer_size - runtime->avail;
917 runtime->xruns += count - count1;
918 }
919 if (count1 > 0) {
920 memcpy(runtime->buffer, buffer, count1);
921 runtime->hw_ptr = count1;
922 runtime->avail += count1;
923 result += count1;
924 }
925 }
926 }
927 if (result > 0) {
928 if (runtime->event)
929 schedule_work(&runtime->event_work);
930 else if (snd_rawmidi_ready(substream))
931 wake_up(&runtime->sleep);
932 }
933 spin_unlock_irqrestore(&runtime->lock, flags);
934 return result;
935}
936EXPORT_SYMBOL(snd_rawmidi_receive);
937
938static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
939 unsigned char __user *userbuf,
940 unsigned char *kernelbuf, long count)
941{
942 unsigned long flags;
943 long result = 0, count1;
944 struct snd_rawmidi_runtime *runtime = substream->runtime;
945 unsigned long appl_ptr;
946
947 spin_lock_irqsave(&runtime->lock, flags);
948 while (count > 0 && runtime->avail) {
949 count1 = runtime->buffer_size - runtime->appl_ptr;
950 if (count1 > count)
951 count1 = count;
952 if (count1 > (int)runtime->avail)
953 count1 = runtime->avail;
954
955 /* update runtime->appl_ptr before unlocking for userbuf */
956 appl_ptr = runtime->appl_ptr;
957 runtime->appl_ptr += count1;
958 runtime->appl_ptr %= runtime->buffer_size;
959 runtime->avail -= count1;
960
961 if (kernelbuf)
962 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
963 if (userbuf) {
964 spin_unlock_irqrestore(&runtime->lock, flags);
965 if (copy_to_user(userbuf + result,
966 runtime->buffer + appl_ptr, count1)) {
967 return result > 0 ? result : -EFAULT;
968 }
969 spin_lock_irqsave(&runtime->lock, flags);
970 }
971 result += count1;
972 count -= count1;
973 }
974 spin_unlock_irqrestore(&runtime->lock, flags);
975 return result;
976}
977
978long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
979 unsigned char *buf, long count)
980{
981 snd_rawmidi_input_trigger(substream, 1);
982 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
983}
984EXPORT_SYMBOL(snd_rawmidi_kernel_read);
985
986static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
987 loff_t *offset)
988{
989 long result;
990 int count1;
991 struct snd_rawmidi_file *rfile;
992 struct snd_rawmidi_substream *substream;
993 struct snd_rawmidi_runtime *runtime;
994
995 rfile = file->private_data;
996 substream = rfile->input;
997 if (substream == NULL)
998 return -EIO;
999 runtime = substream->runtime;
1000 snd_rawmidi_input_trigger(substream, 1);
1001 result = 0;
1002 while (count > 0) {
1003 spin_lock_irq(&runtime->lock);
1004 while (!snd_rawmidi_ready(substream)) {
1005 wait_queue_t wait;
1006 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1007 spin_unlock_irq(&runtime->lock);
1008 return result > 0 ? result : -EAGAIN;
1009 }
1010 init_waitqueue_entry(&wait, current);
1011 add_wait_queue(&runtime->sleep, &wait);
1012 set_current_state(TASK_INTERRUPTIBLE);
1013 spin_unlock_irq(&runtime->lock);
1014 schedule();
1015 remove_wait_queue(&runtime->sleep, &wait);
1016 if (rfile->rmidi->card->shutdown)
1017 return -ENODEV;
1018 if (signal_pending(current))
1019 return result > 0 ? result : -ERESTARTSYS;
1020 if (!runtime->avail)
1021 return result > 0 ? result : -EIO;
1022 spin_lock_irq(&runtime->lock);
1023 }
1024 spin_unlock_irq(&runtime->lock);
1025 count1 = snd_rawmidi_kernel_read1(substream,
1026 (unsigned char __user *)buf,
1027 NULL/*kernelbuf*/,
1028 count);
1029 if (count1 < 0)
1030 return result > 0 ? result : count1;
1031 result += count1;
1032 buf += count1;
1033 count -= count1;
1034 }
1035 return result;
1036}
1037
1038/**
1039 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1040 * @substream: the rawmidi substream
1041 *
1042 * Return: 1 if the internal output buffer is empty, 0 if not.
1043 */
1044int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1045{
1046 struct snd_rawmidi_runtime *runtime = substream->runtime;
1047 int result;
1048 unsigned long flags;
1049
1050 if (runtime->buffer == NULL) {
1051 rmidi_dbg(substream->rmidi,
1052 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1053 return 1;
1054 }
1055 spin_lock_irqsave(&runtime->lock, flags);
1056 result = runtime->avail >= runtime->buffer_size;
1057 spin_unlock_irqrestore(&runtime->lock, flags);
1058 return result;
1059}
1060EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1061
1062/**
1063 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1064 * @substream: the rawmidi substream
1065 * @buffer: the buffer pointer
1066 * @count: data size to transfer
1067 *
1068 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1069 */
1070int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071 unsigned char *buffer, int count)
1072{
1073 int result, count1;
1074 struct snd_rawmidi_runtime *runtime = substream->runtime;
1075
1076 if (runtime->buffer == NULL) {
1077 rmidi_dbg(substream->rmidi,
1078 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1079 return -EINVAL;
1080 }
1081 result = 0;
1082 if (runtime->avail >= runtime->buffer_size) {
1083 /* warning: lowlevel layer MUST trigger down the hardware */
1084 goto __skip;
1085 }
1086 if (count == 1) { /* special case, faster code */
1087 *buffer = runtime->buffer[runtime->hw_ptr];
1088 result++;
1089 } else {
1090 count1 = runtime->buffer_size - runtime->hw_ptr;
1091 if (count1 > count)
1092 count1 = count;
1093 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1094 count1 = runtime->buffer_size - runtime->avail;
1095 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1096 count -= count1;
1097 result += count1;
1098 if (count > 0) {
1099 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1100 count = runtime->buffer_size - runtime->avail - count1;
1101 memcpy(buffer + count1, runtime->buffer, count);
1102 result += count;
1103 }
1104 }
1105 __skip:
1106 return result;
1107}
1108EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1109
1110/**
1111 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1112 * @substream: the rawmidi substream
1113 * @buffer: the buffer pointer
1114 * @count: data size to transfer
1115 *
1116 * Copies data from the internal output buffer to the given buffer.
1117 *
1118 * Call this in the interrupt handler when the midi output is ready,
1119 * and call snd_rawmidi_transmit_ack() after the transmission is
1120 * finished.
1121 *
1122 * Return: The size of copied data, or a negative error code on failure.
1123 */
1124int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1125 unsigned char *buffer, int count)
1126{
1127 struct snd_rawmidi_runtime *runtime = substream->runtime;
1128 int result;
1129 unsigned long flags;
1130
1131 spin_lock_irqsave(&runtime->lock, flags);
1132 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1133 spin_unlock_irqrestore(&runtime->lock, flags);
1134 return result;
1135}
1136EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1137
1138/**
1139 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1140 * @substream: the rawmidi substream
1141 * @count: the transferred count
1142 *
1143 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1144 */
1145int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1146{
1147 struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149 if (runtime->buffer == NULL) {
1150 rmidi_dbg(substream->rmidi,
1151 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1152 return -EINVAL;
1153 }
1154 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1155 runtime->hw_ptr += count;
1156 runtime->hw_ptr %= runtime->buffer_size;
1157 runtime->avail += count;
1158 substream->bytes += count;
1159 if (count > 0) {
1160 if (runtime->drain || snd_rawmidi_ready(substream))
1161 wake_up(&runtime->sleep);
1162 }
1163 return count;
1164}
1165EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1166
1167/**
1168 * snd_rawmidi_transmit_ack - acknowledge the transmission
1169 * @substream: the rawmidi substream
1170 * @count: the transferred count
1171 *
1172 * Advances the hardware pointer for the internal output buffer with
1173 * the given size and updates the condition.
1174 * Call after the transmission is finished.
1175 *
1176 * Return: The advanced size if successful, or a negative error code on failure.
1177 */
1178int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1179{
1180 struct snd_rawmidi_runtime *runtime = substream->runtime;
1181 int result;
1182 unsigned long flags;
1183
1184 spin_lock_irqsave(&runtime->lock, flags);
1185 result = __snd_rawmidi_transmit_ack(substream, count);
1186 spin_unlock_irqrestore(&runtime->lock, flags);
1187 return result;
1188}
1189EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1190
1191/**
1192 * snd_rawmidi_transmit - copy from the buffer to the device
1193 * @substream: the rawmidi substream
1194 * @buffer: the buffer pointer
1195 * @count: the data size to transfer
1196 *
1197 * Copies data from the buffer to the device and advances the pointer.
1198 *
1199 * Return: The copied size if successful, or a negative error code on failure.
1200 */
1201int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1202 unsigned char *buffer, int count)
1203{
1204 struct snd_rawmidi_runtime *runtime = substream->runtime;
1205 int result;
1206 unsigned long flags;
1207
1208 spin_lock_irqsave(&runtime->lock, flags);
1209 if (!substream->opened)
1210 result = -EBADFD;
1211 else {
1212 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1213 if (count <= 0)
1214 result = count;
1215 else
1216 result = __snd_rawmidi_transmit_ack(substream, count);
1217 }
1218 spin_unlock_irqrestore(&runtime->lock, flags);
1219 return result;
1220}
1221EXPORT_SYMBOL(snd_rawmidi_transmit);
1222
1223static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1224 const unsigned char __user *userbuf,
1225 const unsigned char *kernelbuf,
1226 long count)
1227{
1228 unsigned long flags;
1229 long count1, result;
1230 struct snd_rawmidi_runtime *runtime = substream->runtime;
1231 unsigned long appl_ptr;
1232
1233 if (!kernelbuf && !userbuf)
1234 return -EINVAL;
1235 if (snd_BUG_ON(!runtime->buffer))
1236 return -EINVAL;
1237
1238 result = 0;
1239 spin_lock_irqsave(&runtime->lock, flags);
1240 if (substream->append) {
1241 if ((long)runtime->avail < count) {
1242 spin_unlock_irqrestore(&runtime->lock, flags);
1243 return -EAGAIN;
1244 }
1245 }
1246 while (count > 0 && runtime->avail > 0) {
1247 count1 = runtime->buffer_size - runtime->appl_ptr;
1248 if (count1 > count)
1249 count1 = count;
1250 if (count1 > (long)runtime->avail)
1251 count1 = runtime->avail;
1252
1253 /* update runtime->appl_ptr before unlocking for userbuf */
1254 appl_ptr = runtime->appl_ptr;
1255 runtime->appl_ptr += count1;
1256 runtime->appl_ptr %= runtime->buffer_size;
1257 runtime->avail -= count1;
1258
1259 if (kernelbuf)
1260 memcpy(runtime->buffer + appl_ptr,
1261 kernelbuf + result, count1);
1262 else if (userbuf) {
1263 spin_unlock_irqrestore(&runtime->lock, flags);
1264 if (copy_from_user(runtime->buffer + appl_ptr,
1265 userbuf + result, count1)) {
1266 spin_lock_irqsave(&runtime->lock, flags);
1267 result = result > 0 ? result : -EFAULT;
1268 goto __end;
1269 }
1270 spin_lock_irqsave(&runtime->lock, flags);
1271 }
1272 result += count1;
1273 count -= count1;
1274 }
1275 __end:
1276 count1 = runtime->avail < runtime->buffer_size;
1277 spin_unlock_irqrestore(&runtime->lock, flags);
1278 if (count1)
1279 snd_rawmidi_output_trigger(substream, 1);
1280 return result;
1281}
1282
1283long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1284 const unsigned char *buf, long count)
1285{
1286 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1287}
1288EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1289
1290static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1291 size_t count, loff_t *offset)
1292{
1293 long result, timeout;
1294 int count1;
1295 struct snd_rawmidi_file *rfile;
1296 struct snd_rawmidi_runtime *runtime;
1297 struct snd_rawmidi_substream *substream;
1298
1299 rfile = file->private_data;
1300 substream = rfile->output;
1301 runtime = substream->runtime;
1302 /* we cannot put an atomic message to our buffer */
1303 if (substream->append && count > runtime->buffer_size)
1304 return -EIO;
1305 result = 0;
1306 while (count > 0) {
1307 spin_lock_irq(&runtime->lock);
1308 while (!snd_rawmidi_ready_append(substream, count)) {
1309 wait_queue_t wait;
1310 if (file->f_flags & O_NONBLOCK) {
1311 spin_unlock_irq(&runtime->lock);
1312 return result > 0 ? result : -EAGAIN;
1313 }
1314 init_waitqueue_entry(&wait, current);
1315 add_wait_queue(&runtime->sleep, &wait);
1316 set_current_state(TASK_INTERRUPTIBLE);
1317 spin_unlock_irq(&runtime->lock);
1318 timeout = schedule_timeout(30 * HZ);
1319 remove_wait_queue(&runtime->sleep, &wait);
1320 if (rfile->rmidi->card->shutdown)
1321 return -ENODEV;
1322 if (signal_pending(current))
1323 return result > 0 ? result : -ERESTARTSYS;
1324 if (!runtime->avail && !timeout)
1325 return result > 0 ? result : -EIO;
1326 spin_lock_irq(&runtime->lock);
1327 }
1328 spin_unlock_irq(&runtime->lock);
1329 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1330 if (count1 < 0)
1331 return result > 0 ? result : count1;
1332 result += count1;
1333 buf += count1;
1334 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1335 break;
1336 count -= count1;
1337 }
1338 if (file->f_flags & O_DSYNC) {
1339 spin_lock_irq(&runtime->lock);
1340 while (runtime->avail != runtime->buffer_size) {
1341 wait_queue_t wait;
1342 unsigned int last_avail = runtime->avail;
1343 init_waitqueue_entry(&wait, current);
1344 add_wait_queue(&runtime->sleep, &wait);
1345 set_current_state(TASK_INTERRUPTIBLE);
1346 spin_unlock_irq(&runtime->lock);
1347 timeout = schedule_timeout(30 * HZ);
1348 remove_wait_queue(&runtime->sleep, &wait);
1349 if (signal_pending(current))
1350 return result > 0 ? result : -ERESTARTSYS;
1351 if (runtime->avail == last_avail && !timeout)
1352 return result > 0 ? result : -EIO;
1353 spin_lock_irq(&runtime->lock);
1354 }
1355 spin_unlock_irq(&runtime->lock);
1356 }
1357 return result;
1358}
1359
1360static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1361{
1362 struct snd_rawmidi_file *rfile;
1363 struct snd_rawmidi_runtime *runtime;
1364 unsigned int mask;
1365
1366 rfile = file->private_data;
1367 if (rfile->input != NULL) {
1368 runtime = rfile->input->runtime;
1369 snd_rawmidi_input_trigger(rfile->input, 1);
1370 poll_wait(file, &runtime->sleep, wait);
1371 }
1372 if (rfile->output != NULL) {
1373 runtime = rfile->output->runtime;
1374 poll_wait(file, &runtime->sleep, wait);
1375 }
1376 mask = 0;
1377 if (rfile->input != NULL) {
1378 if (snd_rawmidi_ready(rfile->input))
1379 mask |= POLLIN | POLLRDNORM;
1380 }
1381 if (rfile->output != NULL) {
1382 if (snd_rawmidi_ready(rfile->output))
1383 mask |= POLLOUT | POLLWRNORM;
1384 }
1385 return mask;
1386}
1387
1388/*
1389 */
1390#ifdef CONFIG_COMPAT
1391#include "rawmidi_compat.c"
1392#else
1393#define snd_rawmidi_ioctl_compat NULL
1394#endif
1395
1396/*
1397
1398 */
1399
1400static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1401 struct snd_info_buffer *buffer)
1402{
1403 struct snd_rawmidi *rmidi;
1404 struct snd_rawmidi_substream *substream;
1405 struct snd_rawmidi_runtime *runtime;
1406
1407 rmidi = entry->private_data;
1408 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1409 mutex_lock(&rmidi->open_mutex);
1410 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1411 list_for_each_entry(substream,
1412 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1413 list) {
1414 snd_iprintf(buffer,
1415 "Output %d\n"
1416 " Tx bytes : %lu\n",
1417 substream->number,
1418 (unsigned long) substream->bytes);
1419 if (substream->opened) {
1420 snd_iprintf(buffer,
1421 " Owner PID : %d\n",
1422 pid_vnr(substream->pid));
1423 runtime = substream->runtime;
1424 snd_iprintf(buffer,
1425 " Mode : %s\n"
1426 " Buffer size : %lu\n"
1427 " Avail : %lu\n",
1428 runtime->oss ? "OSS compatible" : "native",
1429 (unsigned long) runtime->buffer_size,
1430 (unsigned long) runtime->avail);
1431 }
1432 }
1433 }
1434 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1435 list_for_each_entry(substream,
1436 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1437 list) {
1438 snd_iprintf(buffer,
1439 "Input %d\n"
1440 " Rx bytes : %lu\n",
1441 substream->number,
1442 (unsigned long) substream->bytes);
1443 if (substream->opened) {
1444 snd_iprintf(buffer,
1445 " Owner PID : %d\n",
1446 pid_vnr(substream->pid));
1447 runtime = substream->runtime;
1448 snd_iprintf(buffer,
1449 " Buffer size : %lu\n"
1450 " Avail : %lu\n"
1451 " Overruns : %lu\n",
1452 (unsigned long) runtime->buffer_size,
1453 (unsigned long) runtime->avail,
1454 (unsigned long) runtime->xruns);
1455 }
1456 }
1457 }
1458 mutex_unlock(&rmidi->open_mutex);
1459}
1460
1461/*
1462 * Register functions
1463 */
1464
1465static const struct file_operations snd_rawmidi_f_ops =
1466{
1467 .owner = THIS_MODULE,
1468 .read = snd_rawmidi_read,
1469 .write = snd_rawmidi_write,
1470 .open = snd_rawmidi_open,
1471 .release = snd_rawmidi_release,
1472 .llseek = no_llseek,
1473 .poll = snd_rawmidi_poll,
1474 .unlocked_ioctl = snd_rawmidi_ioctl,
1475 .compat_ioctl = snd_rawmidi_ioctl_compat,
1476};
1477
1478static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1479 struct snd_rawmidi_str *stream,
1480 int direction,
1481 int count)
1482{
1483 struct snd_rawmidi_substream *substream;
1484 int idx;
1485
1486 for (idx = 0; idx < count; idx++) {
1487 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1488 if (!substream)
1489 return -ENOMEM;
1490 substream->stream = direction;
1491 substream->number = idx;
1492 substream->rmidi = rmidi;
1493 substream->pstr = stream;
1494 list_add_tail(&substream->list, &stream->substreams);
1495 stream->substream_count++;
1496 }
1497 return 0;
1498}
1499
1500static void release_rawmidi_device(struct device *dev)
1501{
1502 kfree(container_of(dev, struct snd_rawmidi, dev));
1503}
1504
1505/**
1506 * snd_rawmidi_new - create a rawmidi instance
1507 * @card: the card instance
1508 * @id: the id string
1509 * @device: the device index
1510 * @output_count: the number of output streams
1511 * @input_count: the number of input streams
1512 * @rrawmidi: the pointer to store the new rawmidi instance
1513 *
1514 * Creates a new rawmidi instance.
1515 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1516 *
1517 * Return: Zero if successful, or a negative error code on failure.
1518 */
1519int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1520 int output_count, int input_count,
1521 struct snd_rawmidi ** rrawmidi)
1522{
1523 struct snd_rawmidi *rmidi;
1524 int err;
1525 static struct snd_device_ops ops = {
1526 .dev_free = snd_rawmidi_dev_free,
1527 .dev_register = snd_rawmidi_dev_register,
1528 .dev_disconnect = snd_rawmidi_dev_disconnect,
1529 };
1530
1531 if (snd_BUG_ON(!card))
1532 return -ENXIO;
1533 if (rrawmidi)
1534 *rrawmidi = NULL;
1535 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1536 if (!rmidi)
1537 return -ENOMEM;
1538 rmidi->card = card;
1539 rmidi->device = device;
1540 mutex_init(&rmidi->open_mutex);
1541 init_waitqueue_head(&rmidi->open_wait);
1542 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1543 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1544
1545 if (id != NULL)
1546 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1547
1548 snd_device_initialize(&rmidi->dev, card);
1549 rmidi->dev.release = release_rawmidi_device;
1550 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1551
1552 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1553 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1554 SNDRV_RAWMIDI_STREAM_INPUT,
1555 input_count)) < 0) {
1556 snd_rawmidi_free(rmidi);
1557 return err;
1558 }
1559 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1560 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1561 SNDRV_RAWMIDI_STREAM_OUTPUT,
1562 output_count)) < 0) {
1563 snd_rawmidi_free(rmidi);
1564 return err;
1565 }
1566 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1567 snd_rawmidi_free(rmidi);
1568 return err;
1569 }
1570 if (rrawmidi)
1571 *rrawmidi = rmidi;
1572 return 0;
1573}
1574EXPORT_SYMBOL(snd_rawmidi_new);
1575
1576static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1577{
1578 struct snd_rawmidi_substream *substream;
1579
1580 while (!list_empty(&stream->substreams)) {
1581 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1582 list_del(&substream->list);
1583 kfree(substream);
1584 }
1585}
1586
1587static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1588{
1589 if (!rmidi)
1590 return 0;
1591
1592 snd_info_free_entry(rmidi->proc_entry);
1593 rmidi->proc_entry = NULL;
1594 mutex_lock(®ister_mutex);
1595 if (rmidi->ops && rmidi->ops->dev_unregister)
1596 rmidi->ops->dev_unregister(rmidi);
1597 mutex_unlock(®ister_mutex);
1598
1599 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1600 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1601 if (rmidi->private_free)
1602 rmidi->private_free(rmidi);
1603 put_device(&rmidi->dev);
1604 return 0;
1605}
1606
1607static int snd_rawmidi_dev_free(struct snd_device *device)
1608{
1609 struct snd_rawmidi *rmidi = device->device_data;
1610 return snd_rawmidi_free(rmidi);
1611}
1612
1613#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1614static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1615{
1616 struct snd_rawmidi *rmidi = device->private_data;
1617 rmidi->seq_dev = NULL;
1618}
1619#endif
1620
1621static int snd_rawmidi_dev_register(struct snd_device *device)
1622{
1623 int err;
1624 struct snd_info_entry *entry;
1625 char name[16];
1626 struct snd_rawmidi *rmidi = device->device_data;
1627
1628 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1629 return -ENOMEM;
1630 mutex_lock(®ister_mutex);
1631 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1632 mutex_unlock(®ister_mutex);
1633 return -EBUSY;
1634 }
1635 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1636 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1637 rmidi->card, rmidi->device,
1638 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1639 if (err < 0) {
1640 rmidi_err(rmidi, "unable to register\n");
1641 list_del(&rmidi->list);
1642 mutex_unlock(®ister_mutex);
1643 return err;
1644 }
1645 if (rmidi->ops && rmidi->ops->dev_register &&
1646 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1647 snd_unregister_device(&rmidi->dev);
1648 list_del(&rmidi->list);
1649 mutex_unlock(®ister_mutex);
1650 return err;
1651 }
1652#ifdef CONFIG_SND_OSSEMUL
1653 rmidi->ossreg = 0;
1654 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1655 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1656 rmidi->card, 0, &snd_rawmidi_f_ops,
1657 rmidi) < 0) {
1658 rmidi_err(rmidi,
1659 "unable to register OSS rawmidi device %i:%i\n",
1660 rmidi->card->number, 0);
1661 } else {
1662 rmidi->ossreg++;
1663#ifdef SNDRV_OSS_INFO_DEV_MIDI
1664 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1665#endif
1666 }
1667 }
1668 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1669 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1670 rmidi->card, 1, &snd_rawmidi_f_ops,
1671 rmidi) < 0) {
1672 rmidi_err(rmidi,
1673 "unable to register OSS rawmidi device %i:%i\n",
1674 rmidi->card->number, 1);
1675 } else {
1676 rmidi->ossreg++;
1677 }
1678 }
1679#endif /* CONFIG_SND_OSSEMUL */
1680 mutex_unlock(®ister_mutex);
1681 sprintf(name, "midi%d", rmidi->device);
1682 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1683 if (entry) {
1684 entry->private_data = rmidi;
1685 entry->c.text.read = snd_rawmidi_proc_info_read;
1686 if (snd_info_register(entry) < 0) {
1687 snd_info_free_entry(entry);
1688 entry = NULL;
1689 }
1690 }
1691 rmidi->proc_entry = entry;
1692#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1693 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1694 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1695 rmidi->seq_dev->private_data = rmidi;
1696 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1697 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1698 snd_device_register(rmidi->card, rmidi->seq_dev);
1699 }
1700 }
1701#endif
1702 return 0;
1703}
1704
1705static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1706{
1707 struct snd_rawmidi *rmidi = device->device_data;
1708 int dir;
1709
1710 mutex_lock(®ister_mutex);
1711 mutex_lock(&rmidi->open_mutex);
1712 wake_up(&rmidi->open_wait);
1713 list_del_init(&rmidi->list);
1714 for (dir = 0; dir < 2; dir++) {
1715 struct snd_rawmidi_substream *s;
1716 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1717 if (s->runtime)
1718 wake_up(&s->runtime->sleep);
1719 }
1720 }
1721
1722#ifdef CONFIG_SND_OSSEMUL
1723 if (rmidi->ossreg) {
1724 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1725 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1726#ifdef SNDRV_OSS_INFO_DEV_MIDI
1727 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1728#endif
1729 }
1730 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1731 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1732 rmidi->ossreg = 0;
1733 }
1734#endif /* CONFIG_SND_OSSEMUL */
1735 snd_unregister_device(&rmidi->dev);
1736 mutex_unlock(&rmidi->open_mutex);
1737 mutex_unlock(®ister_mutex);
1738 return 0;
1739}
1740
1741/**
1742 * snd_rawmidi_set_ops - set the rawmidi operators
1743 * @rmidi: the rawmidi instance
1744 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1745 * @ops: the operator table
1746 *
1747 * Sets the rawmidi operators for the given stream direction.
1748 */
1749void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1750 struct snd_rawmidi_ops *ops)
1751{
1752 struct snd_rawmidi_substream *substream;
1753
1754 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1755 substream->ops = ops;
1756}
1757EXPORT_SYMBOL(snd_rawmidi_set_ops);
1758
1759/*
1760 * ENTRY functions
1761 */
1762
1763static int __init alsa_rawmidi_init(void)
1764{
1765
1766 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1767 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1768#ifdef CONFIG_SND_OSSEMUL
1769 { int i;
1770 /* check device map table */
1771 for (i = 0; i < SNDRV_CARDS; i++) {
1772 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1773 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1774 i, midi_map[i]);
1775 midi_map[i] = 0;
1776 }
1777 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1778 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1779 i, amidi_map[i]);
1780 amidi_map[i] = 1;
1781 }
1782 }
1783 }
1784#endif /* CONFIG_SND_OSSEMUL */
1785 return 0;
1786}
1787
1788static void __exit alsa_rawmidi_exit(void)
1789{
1790 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1791 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1792}
1793
1794module_init(alsa_rawmidi_init)
1795module_exit(alsa_rawmidi_exit)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Abstract layer for MIDI v1.0 stream
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <sound/core.h>
8#include <linux/major.h>
9#include <linux/init.h>
10#include <linux/sched/signal.h>
11#include <linux/slab.h>
12#include <linux/time.h>
13#include <linux/wait.h>
14#include <linux/mutex.h>
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/mm.h>
18#include <linux/nospec.h>
19#include <sound/rawmidi.h>
20#include <sound/info.h>
21#include <sound/control.h>
22#include <sound/minors.h>
23#include <sound/initval.h>
24#include <sound/ump.h>
25
26MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
27MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
28MODULE_LICENSE("GPL");
29
30#ifdef CONFIG_SND_OSSEMUL
31static int midi_map[SNDRV_CARDS];
32static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
33module_param_array(midi_map, int, NULL, 0444);
34MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
35module_param_array(amidi_map, int, NULL, 0444);
36MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
37#endif /* CONFIG_SND_OSSEMUL */
38
39static int snd_rawmidi_dev_free(struct snd_device *device);
40static int snd_rawmidi_dev_register(struct snd_device *device);
41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
42
43static LIST_HEAD(snd_rawmidi_devices);
44static DEFINE_MUTEX(register_mutex);
45
46#define rmidi_err(rmidi, fmt, args...) \
47 dev_err((rmidi)->dev, fmt, ##args)
48#define rmidi_warn(rmidi, fmt, args...) \
49 dev_warn((rmidi)->dev, fmt, ##args)
50#define rmidi_dbg(rmidi, fmt, args...) \
51 dev_dbg((rmidi)->dev, fmt, ##args)
52
53struct snd_rawmidi_status32 {
54 s32 stream;
55 s32 tstamp_sec; /* Timestamp */
56 s32 tstamp_nsec;
57 u32 avail; /* available bytes */
58 u32 xruns; /* count of overruns since last status (in bytes) */
59 unsigned char reserved[16]; /* reserved for future use */
60};
61
62#define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32)
63
64struct snd_rawmidi_status64 {
65 int stream;
66 u8 rsvd[4]; /* alignment */
67 s64 tstamp_sec; /* Timestamp */
68 s64 tstamp_nsec;
69 size_t avail; /* available bytes */
70 size_t xruns; /* count of overruns since last status (in bytes) */
71 unsigned char reserved[16]; /* reserved for future use */
72};
73
74#define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64)
75
76#define rawmidi_is_ump(rmidi) \
77 (IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP))
78
79static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
80{
81 struct snd_rawmidi *rawmidi;
82
83 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
84 if (rawmidi->card == card && rawmidi->device == device)
85 return rawmidi;
86 return NULL;
87}
88
89static inline unsigned short snd_rawmidi_file_flags(struct file *file)
90{
91 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
92 case FMODE_WRITE:
93 return SNDRV_RAWMIDI_LFLG_OUTPUT;
94 case FMODE_READ:
95 return SNDRV_RAWMIDI_LFLG_INPUT;
96 default:
97 return SNDRV_RAWMIDI_LFLG_OPEN;
98 }
99}
100
101static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
102{
103 return runtime->avail >= runtime->avail_min;
104}
105
106static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
107{
108 guard(spinlock_irqsave)(&substream->lock);
109 return __snd_rawmidi_ready(substream->runtime);
110}
111
112static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
113 size_t count)
114{
115 struct snd_rawmidi_runtime *runtime = substream->runtime;
116
117 return runtime->avail >= runtime->avail_min &&
118 (!substream->append || runtime->avail >= count);
119}
120
121static void snd_rawmidi_input_event_work(struct work_struct *work)
122{
123 struct snd_rawmidi_runtime *runtime =
124 container_of(work, struct snd_rawmidi_runtime, event_work);
125
126 if (runtime->event)
127 runtime->event(runtime->substream);
128}
129
130/* buffer refcount management: call with substream->lock held */
131static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
132{
133 runtime->buffer_ref++;
134}
135
136static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
137{
138 runtime->buffer_ref--;
139}
140
141static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
142{
143 int loop = HZ;
144
145 spin_lock_irq(&substream->lock);
146 while (substream->runtime->buffer_ref) {
147 spin_unlock_irq(&substream->lock);
148 if (!--loop) {
149 rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
150 return;
151 }
152 schedule_timeout_uninterruptible(1);
153 spin_lock_irq(&substream->lock);
154 }
155 spin_unlock_irq(&substream->lock);
156}
157
158static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
159{
160 struct snd_rawmidi_runtime *runtime;
161
162 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
163 if (!runtime)
164 return -ENOMEM;
165 runtime->substream = substream;
166 init_waitqueue_head(&runtime->sleep);
167 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
168 runtime->event = NULL;
169 runtime->buffer_size = PAGE_SIZE;
170 runtime->avail_min = 1;
171 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
172 runtime->avail = 0;
173 else
174 runtime->avail = runtime->buffer_size;
175 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
176 if (!runtime->buffer) {
177 kfree(runtime);
178 return -ENOMEM;
179 }
180 runtime->appl_ptr = runtime->hw_ptr = 0;
181 substream->runtime = runtime;
182 if (rawmidi_is_ump(substream->rmidi))
183 runtime->align = 3;
184 return 0;
185}
186
187/* get the current alignment (either 0 or 3) */
188static inline int get_align(struct snd_rawmidi_runtime *runtime)
189{
190 if (IS_ENABLED(CONFIG_SND_UMP))
191 return runtime->align;
192 else
193 return 0;
194}
195
196/* get the trimmed size with the current alignment */
197#define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))
198
199static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
200{
201 struct snd_rawmidi_runtime *runtime = substream->runtime;
202
203 kvfree(runtime->buffer);
204 kfree(runtime);
205 substream->runtime = NULL;
206 return 0;
207}
208
209static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
210{
211 if (!substream->opened)
212 return;
213 substream->ops->trigger(substream, up);
214}
215
216static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
217{
218 if (!substream->opened)
219 return;
220 substream->ops->trigger(substream, up);
221 if (!up)
222 cancel_work_sync(&substream->runtime->event_work);
223}
224
225static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
226 bool is_input)
227{
228 runtime->drain = 0;
229 runtime->appl_ptr = runtime->hw_ptr = 0;
230 runtime->avail = is_input ? 0 : runtime->buffer_size;
231}
232
233static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
234 bool is_input)
235{
236 guard(spinlock_irqsave)(&substream->lock);
237 if (substream->opened && substream->runtime)
238 __reset_runtime_ptrs(substream->runtime, is_input);
239}
240
241int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
242{
243 snd_rawmidi_output_trigger(substream, 0);
244 reset_runtime_ptrs(substream, false);
245 return 0;
246}
247EXPORT_SYMBOL(snd_rawmidi_drop_output);
248
249int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
250{
251 int err = 0;
252 long timeout;
253 struct snd_rawmidi_runtime *runtime;
254
255 scoped_guard(spinlock_irq, &substream->lock) {
256 runtime = substream->runtime;
257 if (!substream->opened || !runtime || !runtime->buffer)
258 return -EINVAL;
259 snd_rawmidi_buffer_ref(runtime);
260 runtime->drain = 1;
261 }
262
263 timeout = wait_event_interruptible_timeout(runtime->sleep,
264 (runtime->avail >= runtime->buffer_size),
265 10*HZ);
266
267 scoped_guard(spinlock_irq, &substream->lock) {
268 if (signal_pending(current))
269 err = -ERESTARTSYS;
270 if (runtime->avail < runtime->buffer_size && !timeout) {
271 rmidi_warn(substream->rmidi,
272 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
273 (long)runtime->avail, (long)runtime->buffer_size);
274 err = -EIO;
275 }
276 runtime->drain = 0;
277 }
278
279 if (err != -ERESTARTSYS) {
280 /* we need wait a while to make sure that Tx FIFOs are empty */
281 if (substream->ops->drain)
282 substream->ops->drain(substream);
283 else
284 msleep(50);
285 snd_rawmidi_drop_output(substream);
286 }
287
288 scoped_guard(spinlock_irq, &substream->lock)
289 snd_rawmidi_buffer_unref(runtime);
290
291 return err;
292}
293EXPORT_SYMBOL(snd_rawmidi_drain_output);
294
295int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
296{
297 snd_rawmidi_input_trigger(substream, 0);
298 reset_runtime_ptrs(substream, true);
299 return 0;
300}
301EXPORT_SYMBOL(snd_rawmidi_drain_input);
302
303/* look for an available substream for the given stream direction;
304 * if a specific subdevice is given, try to assign it
305 */
306static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
307 int stream, int mode,
308 struct snd_rawmidi_substream **sub_ret)
309{
310 struct snd_rawmidi_substream *substream;
311 struct snd_rawmidi_str *s = &rmidi->streams[stream];
312 static const unsigned int info_flags[2] = {
313 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
314 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
315 };
316
317 if (!(rmidi->info_flags & info_flags[stream]))
318 return -ENXIO;
319 if (subdevice >= 0 && subdevice >= s->substream_count)
320 return -ENODEV;
321
322 list_for_each_entry(substream, &s->substreams, list) {
323 if (substream->opened) {
324 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
325 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
326 !substream->append)
327 continue;
328 }
329 if (subdevice < 0 || subdevice == substream->number) {
330 *sub_ret = substream;
331 return 0;
332 }
333 }
334 return -EAGAIN;
335}
336
337/* open and do ref-counting for the given substream */
338static int open_substream(struct snd_rawmidi *rmidi,
339 struct snd_rawmidi_substream *substream,
340 int mode)
341{
342 int err;
343
344 if (substream->use_count == 0) {
345 err = snd_rawmidi_runtime_create(substream);
346 if (err < 0)
347 return err;
348 err = substream->ops->open(substream);
349 if (err < 0) {
350 snd_rawmidi_runtime_free(substream);
351 return err;
352 }
353 guard(spinlock_irq)(&substream->lock);
354 substream->opened = 1;
355 substream->active_sensing = 0;
356 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
357 substream->append = 1;
358 substream->pid = get_pid(task_pid(current));
359 rmidi->streams[substream->stream].substream_opened++;
360 }
361 substream->use_count++;
362 return 0;
363}
364
365static void close_substream(struct snd_rawmidi *rmidi,
366 struct snd_rawmidi_substream *substream,
367 int cleanup);
368
369static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
370 struct snd_rawmidi_file *rfile)
371{
372 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
373 int err;
374
375 rfile->input = rfile->output = NULL;
376 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
377 err = assign_substream(rmidi, subdevice,
378 SNDRV_RAWMIDI_STREAM_INPUT,
379 mode, &sinput);
380 if (err < 0)
381 return err;
382 }
383 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
384 err = assign_substream(rmidi, subdevice,
385 SNDRV_RAWMIDI_STREAM_OUTPUT,
386 mode, &soutput);
387 if (err < 0)
388 return err;
389 }
390
391 if (sinput) {
392 err = open_substream(rmidi, sinput, mode);
393 if (err < 0)
394 return err;
395 }
396 if (soutput) {
397 err = open_substream(rmidi, soutput, mode);
398 if (err < 0) {
399 if (sinput)
400 close_substream(rmidi, sinput, 0);
401 return err;
402 }
403 }
404
405 rfile->rmidi = rmidi;
406 rfile->input = sinput;
407 rfile->output = soutput;
408 return 0;
409}
410
411/* called from sound/core/seq/seq_midi.c */
412int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
413 int mode, struct snd_rawmidi_file *rfile)
414{
415 int err;
416
417 if (snd_BUG_ON(!rfile))
418 return -EINVAL;
419 if (!try_module_get(rmidi->card->module))
420 return -ENXIO;
421
422 guard(mutex)(&rmidi->open_mutex);
423 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
424 if (err < 0)
425 module_put(rmidi->card->module);
426 return err;
427}
428EXPORT_SYMBOL(snd_rawmidi_kernel_open);
429
430static int snd_rawmidi_open(struct inode *inode, struct file *file)
431{
432 int maj = imajor(inode);
433 struct snd_card *card;
434 int subdevice;
435 unsigned short fflags;
436 int err;
437 struct snd_rawmidi *rmidi;
438 struct snd_rawmidi_file *rawmidi_file = NULL;
439 wait_queue_entry_t wait;
440
441 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
442 return -EINVAL; /* invalid combination */
443
444 err = stream_open(inode, file);
445 if (err < 0)
446 return err;
447
448 if (maj == snd_major) {
449 rmidi = snd_lookup_minor_data(iminor(inode),
450 SNDRV_DEVICE_TYPE_RAWMIDI);
451#ifdef CONFIG_SND_OSSEMUL
452 } else if (maj == SOUND_MAJOR) {
453 rmidi = snd_lookup_oss_minor_data(iminor(inode),
454 SNDRV_OSS_DEVICE_TYPE_MIDI);
455#endif
456 } else
457 return -ENXIO;
458
459 if (rmidi == NULL)
460 return -ENODEV;
461
462 if (!try_module_get(rmidi->card->module)) {
463 snd_card_unref(rmidi->card);
464 return -ENXIO;
465 }
466
467 mutex_lock(&rmidi->open_mutex);
468 card = rmidi->card;
469 err = snd_card_file_add(card, file);
470 if (err < 0)
471 goto __error_card;
472 fflags = snd_rawmidi_file_flags(file);
473 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
474 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
475 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
476 if (rawmidi_file == NULL) {
477 err = -ENOMEM;
478 goto __error;
479 }
480 rawmidi_file->user_pversion = 0;
481 init_waitqueue_entry(&wait, current);
482 add_wait_queue(&rmidi->open_wait, &wait);
483 while (1) {
484 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
485 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
486 if (err >= 0)
487 break;
488 if (err == -EAGAIN) {
489 if (file->f_flags & O_NONBLOCK) {
490 err = -EBUSY;
491 break;
492 }
493 } else
494 break;
495 set_current_state(TASK_INTERRUPTIBLE);
496 mutex_unlock(&rmidi->open_mutex);
497 schedule();
498 mutex_lock(&rmidi->open_mutex);
499 if (rmidi->card->shutdown) {
500 err = -ENODEV;
501 break;
502 }
503 if (signal_pending(current)) {
504 err = -ERESTARTSYS;
505 break;
506 }
507 }
508 remove_wait_queue(&rmidi->open_wait, &wait);
509 if (err < 0) {
510 kfree(rawmidi_file);
511 goto __error;
512 }
513#ifdef CONFIG_SND_OSSEMUL
514 if (rawmidi_file->input && rawmidi_file->input->runtime)
515 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
516 if (rawmidi_file->output && rawmidi_file->output->runtime)
517 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
518#endif
519 file->private_data = rawmidi_file;
520 mutex_unlock(&rmidi->open_mutex);
521 snd_card_unref(rmidi->card);
522 return 0;
523
524 __error:
525 snd_card_file_remove(card, file);
526 __error_card:
527 mutex_unlock(&rmidi->open_mutex);
528 module_put(rmidi->card->module);
529 snd_card_unref(rmidi->card);
530 return err;
531}
532
533static void close_substream(struct snd_rawmidi *rmidi,
534 struct snd_rawmidi_substream *substream,
535 int cleanup)
536{
537 if (--substream->use_count)
538 return;
539
540 if (cleanup) {
541 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
542 snd_rawmidi_input_trigger(substream, 0);
543 else {
544 if (substream->active_sensing) {
545 unsigned char buf = 0xfe;
546 /* sending single active sensing message
547 * to shut the device up
548 */
549 snd_rawmidi_kernel_write(substream, &buf, 1);
550 }
551 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
552 snd_rawmidi_output_trigger(substream, 0);
553 }
554 snd_rawmidi_buffer_ref_sync(substream);
555 }
556 scoped_guard(spinlock_irq, &substream->lock) {
557 substream->opened = 0;
558 substream->append = 0;
559 }
560 substream->ops->close(substream);
561 if (substream->runtime->private_free)
562 substream->runtime->private_free(substream);
563 snd_rawmidi_runtime_free(substream);
564 put_pid(substream->pid);
565 substream->pid = NULL;
566 rmidi->streams[substream->stream].substream_opened--;
567}
568
569static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
570{
571 struct snd_rawmidi *rmidi;
572
573 rmidi = rfile->rmidi;
574 guard(mutex)(&rmidi->open_mutex);
575 if (rfile->input) {
576 close_substream(rmidi, rfile->input, 1);
577 rfile->input = NULL;
578 }
579 if (rfile->output) {
580 close_substream(rmidi, rfile->output, 1);
581 rfile->output = NULL;
582 }
583 rfile->rmidi = NULL;
584 wake_up(&rmidi->open_wait);
585}
586
587/* called from sound/core/seq/seq_midi.c */
588int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
589{
590 struct snd_rawmidi *rmidi;
591
592 if (snd_BUG_ON(!rfile))
593 return -ENXIO;
594
595 rmidi = rfile->rmidi;
596 rawmidi_release_priv(rfile);
597 module_put(rmidi->card->module);
598 return 0;
599}
600EXPORT_SYMBOL(snd_rawmidi_kernel_release);
601
602static int snd_rawmidi_release(struct inode *inode, struct file *file)
603{
604 struct snd_rawmidi_file *rfile;
605 struct snd_rawmidi *rmidi;
606 struct module *module;
607
608 rfile = file->private_data;
609 rmidi = rfile->rmidi;
610 rawmidi_release_priv(rfile);
611 kfree(rfile);
612 module = rmidi->card->module;
613 snd_card_file_remove(rmidi->card, file);
614 module_put(module);
615 return 0;
616}
617
618static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
619 struct snd_rawmidi_info *info)
620{
621 struct snd_rawmidi *rmidi;
622
623 if (substream == NULL)
624 return -ENODEV;
625 rmidi = substream->rmidi;
626 memset(info, 0, sizeof(*info));
627 info->card = rmidi->card->number;
628 info->device = rmidi->device;
629 info->subdevice = substream->number;
630 info->stream = substream->stream;
631 info->flags = rmidi->info_flags;
632 strcpy(info->id, rmidi->id);
633 strcpy(info->name, rmidi->name);
634 strcpy(info->subname, substream->name);
635 info->subdevices_count = substream->pstr->substream_count;
636 info->subdevices_avail = (substream->pstr->substream_count -
637 substream->pstr->substream_opened);
638 return 0;
639}
640
641static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
642 struct snd_rawmidi_info __user *_info)
643{
644 struct snd_rawmidi_info info;
645 int err;
646
647 err = snd_rawmidi_info(substream, &info);
648 if (err < 0)
649 return err;
650 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
651 return -EFAULT;
652 return 0;
653}
654
655static int __snd_rawmidi_info_select(struct snd_card *card,
656 struct snd_rawmidi_info *info)
657{
658 struct snd_rawmidi *rmidi;
659 struct snd_rawmidi_str *pstr;
660 struct snd_rawmidi_substream *substream;
661
662 rmidi = snd_rawmidi_search(card, info->device);
663 if (!rmidi)
664 return -ENXIO;
665 if (info->stream < 0 || info->stream > 1)
666 return -EINVAL;
667 info->stream = array_index_nospec(info->stream, 2);
668 pstr = &rmidi->streams[info->stream];
669 if (pstr->substream_count == 0)
670 return -ENOENT;
671 if (info->subdevice >= pstr->substream_count)
672 return -ENXIO;
673 list_for_each_entry(substream, &pstr->substreams, list) {
674 if ((unsigned int)substream->number == info->subdevice)
675 return snd_rawmidi_info(substream, info);
676 }
677 return -ENXIO;
678}
679
680int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
681{
682 guard(mutex)(®ister_mutex);
683 return __snd_rawmidi_info_select(card, info);
684}
685EXPORT_SYMBOL(snd_rawmidi_info_select);
686
687static int snd_rawmidi_info_select_user(struct snd_card *card,
688 struct snd_rawmidi_info __user *_info)
689{
690 int err;
691 struct snd_rawmidi_info info;
692
693 if (get_user(info.device, &_info->device))
694 return -EFAULT;
695 if (get_user(info.stream, &_info->stream))
696 return -EFAULT;
697 if (get_user(info.subdevice, &_info->subdevice))
698 return -EFAULT;
699 err = snd_rawmidi_info_select(card, &info);
700 if (err < 0)
701 return err;
702 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
703 return -EFAULT;
704 return 0;
705}
706
707static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
708 struct snd_rawmidi_params *params,
709 bool is_input)
710{
711 struct snd_rawmidi_runtime *runtime = substream->runtime;
712 char *newbuf, *oldbuf;
713 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
714
715 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
716 return -EINVAL;
717 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
718 return -EINVAL;
719 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
720 return -EINVAL;
721 if (params->buffer_size & get_align(runtime))
722 return -EINVAL;
723 if (params->buffer_size != runtime->buffer_size) {
724 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
725 if (!newbuf)
726 return -ENOMEM;
727 spin_lock_irq(&substream->lock);
728 if (runtime->buffer_ref) {
729 spin_unlock_irq(&substream->lock);
730 kvfree(newbuf);
731 return -EBUSY;
732 }
733 oldbuf = runtime->buffer;
734 runtime->buffer = newbuf;
735 runtime->buffer_size = params->buffer_size;
736 __reset_runtime_ptrs(runtime, is_input);
737 spin_unlock_irq(&substream->lock);
738 kvfree(oldbuf);
739 }
740 runtime->avail_min = params->avail_min;
741 return 0;
742}
743
744int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
745 struct snd_rawmidi_params *params)
746{
747 int err;
748
749 snd_rawmidi_drain_output(substream);
750 guard(mutex)(&substream->rmidi->open_mutex);
751 if (substream->append && substream->use_count > 1)
752 return -EBUSY;
753 err = resize_runtime_buffer(substream, params, false);
754 if (!err)
755 substream->active_sensing = !params->no_active_sensing;
756 return err;
757}
758EXPORT_SYMBOL(snd_rawmidi_output_params);
759
760int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
761 struct snd_rawmidi_params *params)
762{
763 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
764 unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
765 int err;
766
767 snd_rawmidi_drain_input(substream);
768 guard(mutex)(&substream->rmidi->open_mutex);
769 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
770 err = -EINVAL;
771 else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
772 err = -EINVAL;
773 else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
774 err = -EINVAL;
775 else
776 err = resize_runtime_buffer(substream, params, true);
777
778 if (!err) {
779 substream->framing = framing;
780 substream->clock_type = clock_type;
781 }
782 return 0;
783}
784EXPORT_SYMBOL(snd_rawmidi_input_params);
785
786static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
787 struct snd_rawmidi_status64 *status)
788{
789 struct snd_rawmidi_runtime *runtime = substream->runtime;
790
791 memset(status, 0, sizeof(*status));
792 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
793 guard(spinlock_irq)(&substream->lock);
794 status->avail = runtime->avail;
795 return 0;
796}
797
798static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
799 struct snd_rawmidi_status64 *status)
800{
801 struct snd_rawmidi_runtime *runtime = substream->runtime;
802
803 memset(status, 0, sizeof(*status));
804 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
805 guard(spinlock_irq)(&substream->lock);
806 status->avail = runtime->avail;
807 status->xruns = runtime->xruns;
808 runtime->xruns = 0;
809 return 0;
810}
811
812static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
813 struct snd_rawmidi_status32 __user *argp)
814{
815 int err = 0;
816 struct snd_rawmidi_status32 __user *status = argp;
817 struct snd_rawmidi_status32 status32;
818 struct snd_rawmidi_status64 status64;
819
820 if (copy_from_user(&status32, argp,
821 sizeof(struct snd_rawmidi_status32)))
822 return -EFAULT;
823
824 switch (status32.stream) {
825 case SNDRV_RAWMIDI_STREAM_OUTPUT:
826 if (rfile->output == NULL)
827 return -EINVAL;
828 err = snd_rawmidi_output_status(rfile->output, &status64);
829 break;
830 case SNDRV_RAWMIDI_STREAM_INPUT:
831 if (rfile->input == NULL)
832 return -EINVAL;
833 err = snd_rawmidi_input_status(rfile->input, &status64);
834 break;
835 default:
836 return -EINVAL;
837 }
838 if (err < 0)
839 return err;
840
841 status32 = (struct snd_rawmidi_status32) {
842 .stream = status64.stream,
843 .tstamp_sec = status64.tstamp_sec,
844 .tstamp_nsec = status64.tstamp_nsec,
845 .avail = status64.avail,
846 .xruns = status64.xruns,
847 };
848
849 if (copy_to_user(status, &status32, sizeof(*status)))
850 return -EFAULT;
851
852 return 0;
853}
854
855static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
856 struct snd_rawmidi_status64 __user *argp)
857{
858 int err = 0;
859 struct snd_rawmidi_status64 status;
860
861 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
862 return -EFAULT;
863
864 switch (status.stream) {
865 case SNDRV_RAWMIDI_STREAM_OUTPUT:
866 if (rfile->output == NULL)
867 return -EINVAL;
868 err = snd_rawmidi_output_status(rfile->output, &status);
869 break;
870 case SNDRV_RAWMIDI_STREAM_INPUT:
871 if (rfile->input == NULL)
872 return -EINVAL;
873 err = snd_rawmidi_input_status(rfile->input, &status);
874 break;
875 default:
876 return -EINVAL;
877 }
878 if (err < 0)
879 return err;
880 if (copy_to_user(argp, &status,
881 sizeof(struct snd_rawmidi_status64)))
882 return -EFAULT;
883 return 0;
884}
885
886static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
887{
888 struct snd_rawmidi_file *rfile;
889 struct snd_rawmidi *rmidi;
890 void __user *argp = (void __user *)arg;
891
892 rfile = file->private_data;
893 if (((cmd >> 8) & 0xff) != 'W')
894 return -ENOTTY;
895 switch (cmd) {
896 case SNDRV_RAWMIDI_IOCTL_PVERSION:
897 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
898 case SNDRV_RAWMIDI_IOCTL_INFO:
899 {
900 int stream;
901 struct snd_rawmidi_info __user *info = argp;
902
903 if (get_user(stream, &info->stream))
904 return -EFAULT;
905 switch (stream) {
906 case SNDRV_RAWMIDI_STREAM_INPUT:
907 return snd_rawmidi_info_user(rfile->input, info);
908 case SNDRV_RAWMIDI_STREAM_OUTPUT:
909 return snd_rawmidi_info_user(rfile->output, info);
910 default:
911 return -EINVAL;
912 }
913 }
914 case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
915 if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
916 return -EFAULT;
917 return 0;
918
919 case SNDRV_RAWMIDI_IOCTL_PARAMS:
920 {
921 struct snd_rawmidi_params params;
922
923 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
924 return -EFAULT;
925 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
926 params.mode = 0;
927 memset(params.reserved, 0, sizeof(params.reserved));
928 }
929 switch (params.stream) {
930 case SNDRV_RAWMIDI_STREAM_OUTPUT:
931 if (rfile->output == NULL)
932 return -EINVAL;
933 return snd_rawmidi_output_params(rfile->output, ¶ms);
934 case SNDRV_RAWMIDI_STREAM_INPUT:
935 if (rfile->input == NULL)
936 return -EINVAL;
937 return snd_rawmidi_input_params(rfile->input, ¶ms);
938 default:
939 return -EINVAL;
940 }
941 }
942 case SNDRV_RAWMIDI_IOCTL_STATUS32:
943 return snd_rawmidi_ioctl_status32(rfile, argp);
944 case SNDRV_RAWMIDI_IOCTL_STATUS64:
945 return snd_rawmidi_ioctl_status64(rfile, argp);
946 case SNDRV_RAWMIDI_IOCTL_DROP:
947 {
948 int val;
949
950 if (get_user(val, (int __user *) argp))
951 return -EFAULT;
952 switch (val) {
953 case SNDRV_RAWMIDI_STREAM_OUTPUT:
954 if (rfile->output == NULL)
955 return -EINVAL;
956 return snd_rawmidi_drop_output(rfile->output);
957 default:
958 return -EINVAL;
959 }
960 }
961 case SNDRV_RAWMIDI_IOCTL_DRAIN:
962 {
963 int val;
964
965 if (get_user(val, (int __user *) argp))
966 return -EFAULT;
967 switch (val) {
968 case SNDRV_RAWMIDI_STREAM_OUTPUT:
969 if (rfile->output == NULL)
970 return -EINVAL;
971 return snd_rawmidi_drain_output(rfile->output);
972 case SNDRV_RAWMIDI_STREAM_INPUT:
973 if (rfile->input == NULL)
974 return -EINVAL;
975 return snd_rawmidi_drain_input(rfile->input);
976 default:
977 return -EINVAL;
978 }
979 }
980 default:
981 rmidi = rfile->rmidi;
982 if (rmidi->ops && rmidi->ops->ioctl)
983 return rmidi->ops->ioctl(rmidi, cmd, argp);
984 rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
985 }
986 return -ENOTTY;
987}
988
989/* ioctl to find the next device; either legacy or UMP depending on @find_ump */
990static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
991 bool find_ump)
992
993{
994 struct snd_rawmidi *rmidi;
995 int device;
996 bool is_ump;
997
998 if (get_user(device, argp))
999 return -EFAULT;
1000 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1001 device = SNDRV_RAWMIDI_DEVICES - 1;
1002 scoped_guard(mutex, ®ister_mutex) {
1003 device = device < 0 ? 0 : device + 1;
1004 for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
1005 rmidi = snd_rawmidi_search(card, device);
1006 if (!rmidi)
1007 continue;
1008 is_ump = rawmidi_is_ump(rmidi);
1009 if (find_ump == is_ump)
1010 break;
1011 }
1012 if (device == SNDRV_RAWMIDI_DEVICES)
1013 device = -1;
1014 }
1015 if (put_user(device, argp))
1016 return -EFAULT;
1017 return 0;
1018}
1019
1020#if IS_ENABLED(CONFIG_SND_UMP)
1021/* inquiry of UMP endpoint and block info via control API */
1022static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
1023 void __user *argp)
1024{
1025 struct snd_ump_endpoint_info __user *info = argp;
1026 struct snd_rawmidi *rmidi;
1027 int device;
1028
1029 if (get_user(device, &info->device))
1030 return -EFAULT;
1031 guard(mutex)(®ister_mutex);
1032 rmidi = snd_rawmidi_search(card, device);
1033 if (rmidi && rmidi->ops && rmidi->ops->ioctl)
1034 return rmidi->ops->ioctl(rmidi, cmd, argp);
1035 else
1036 return -ENXIO;
1037}
1038#endif
1039
1040static int snd_rawmidi_control_ioctl(struct snd_card *card,
1041 struct snd_ctl_file *control,
1042 unsigned int cmd,
1043 unsigned long arg)
1044{
1045 void __user *argp = (void __user *)arg;
1046
1047 switch (cmd) {
1048 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1049 return snd_rawmidi_next_device(card, argp, false);
1050#if IS_ENABLED(CONFIG_SND_UMP)
1051 case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
1052 return snd_rawmidi_next_device(card, argp, true);
1053 case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
1054 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
1055 case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
1056 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
1057#endif
1058 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1059 {
1060 int val;
1061
1062 if (get_user(val, (int __user *)argp))
1063 return -EFAULT;
1064 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1065 return 0;
1066 }
1067 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1068 return snd_rawmidi_info_select_user(card, argp);
1069 }
1070 return -ENOIOCTLCMD;
1071}
1072
1073static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1074 const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1075{
1076 struct snd_rawmidi_runtime *runtime = substream->runtime;
1077 struct snd_rawmidi_framing_tstamp *dest_ptr;
1078 struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1079 int orig_count = src_count;
1080 int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1081 int align = get_align(runtime);
1082
1083 BUILD_BUG_ON(frame_size != 0x20);
1084 if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1085 return -EINVAL;
1086
1087 while (src_count > align) {
1088 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1089 runtime->xruns += src_count;
1090 break;
1091 }
1092 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1093 frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1094 else {
1095 frame.length = get_aligned_size(runtime, src_count);
1096 if (!frame.length)
1097 break;
1098 memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1099 }
1100 memcpy(frame.data, buffer, frame.length);
1101 buffer += frame.length;
1102 src_count -= frame.length;
1103 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1104 *dest_ptr = frame;
1105 runtime->avail += frame_size;
1106 runtime->hw_ptr += frame_size;
1107 runtime->hw_ptr %= runtime->buffer_size;
1108 }
1109 return orig_count - src_count;
1110}
1111
1112static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1113{
1114 struct timespec64 ts64 = {0, 0};
1115
1116 switch (substream->clock_type) {
1117 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1118 ktime_get_raw_ts64(&ts64);
1119 break;
1120 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1121 ktime_get_ts64(&ts64);
1122 break;
1123 case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1124 ktime_get_real_ts64(&ts64);
1125 break;
1126 }
1127 return ts64;
1128}
1129
1130/**
1131 * snd_rawmidi_receive - receive the input data from the device
1132 * @substream: the rawmidi substream
1133 * @buffer: the buffer pointer
1134 * @count: the data size to read
1135 *
1136 * Reads the data from the internal buffer.
1137 *
1138 * Return: The size of read data, or a negative error code on failure.
1139 */
1140int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1141 const unsigned char *buffer, int count)
1142{
1143 struct timespec64 ts64 = get_framing_tstamp(substream);
1144 int result = 0, count1;
1145 struct snd_rawmidi_runtime *runtime;
1146
1147 guard(spinlock_irqsave)(&substream->lock);
1148 if (!substream->opened)
1149 return -EBADFD;
1150 runtime = substream->runtime;
1151 if (!runtime || !runtime->buffer) {
1152 rmidi_dbg(substream->rmidi,
1153 "snd_rawmidi_receive: input is not active!!!\n");
1154 return -EINVAL;
1155 }
1156
1157 count = get_aligned_size(runtime, count);
1158 if (!count)
1159 return result;
1160
1161 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1162 result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1163 } else if (count == 1) { /* special case, faster code */
1164 substream->bytes++;
1165 if (runtime->avail < runtime->buffer_size) {
1166 runtime->buffer[runtime->hw_ptr++] = buffer[0];
1167 runtime->hw_ptr %= runtime->buffer_size;
1168 runtime->avail++;
1169 result++;
1170 } else {
1171 runtime->xruns++;
1172 }
1173 } else {
1174 substream->bytes += count;
1175 count1 = runtime->buffer_size - runtime->hw_ptr;
1176 if (count1 > count)
1177 count1 = count;
1178 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1179 count1 = runtime->buffer_size - runtime->avail;
1180 count1 = get_aligned_size(runtime, count1);
1181 if (!count1)
1182 return result;
1183 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1184 runtime->hw_ptr += count1;
1185 runtime->hw_ptr %= runtime->buffer_size;
1186 runtime->avail += count1;
1187 count -= count1;
1188 result += count1;
1189 if (count > 0) {
1190 buffer += count1;
1191 count1 = count;
1192 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1193 count1 = runtime->buffer_size - runtime->avail;
1194 runtime->xruns += count - count1;
1195 }
1196 if (count1 > 0) {
1197 memcpy(runtime->buffer, buffer, count1);
1198 runtime->hw_ptr = count1;
1199 runtime->avail += count1;
1200 result += count1;
1201 }
1202 }
1203 }
1204 if (result > 0) {
1205 if (runtime->event)
1206 schedule_work(&runtime->event_work);
1207 else if (__snd_rawmidi_ready(runtime))
1208 wake_up(&runtime->sleep);
1209 }
1210 return result;
1211}
1212EXPORT_SYMBOL(snd_rawmidi_receive);
1213
1214static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1215 unsigned char __user *userbuf,
1216 unsigned char *kernelbuf, long count)
1217{
1218 unsigned long flags;
1219 long result = 0, count1;
1220 struct snd_rawmidi_runtime *runtime = substream->runtime;
1221 unsigned long appl_ptr;
1222 int err = 0;
1223
1224 spin_lock_irqsave(&substream->lock, flags);
1225 snd_rawmidi_buffer_ref(runtime);
1226 while (count > 0 && runtime->avail) {
1227 count1 = runtime->buffer_size - runtime->appl_ptr;
1228 if (count1 > count)
1229 count1 = count;
1230 if (count1 > (int)runtime->avail)
1231 count1 = runtime->avail;
1232
1233 /* update runtime->appl_ptr before unlocking for userbuf */
1234 appl_ptr = runtime->appl_ptr;
1235 runtime->appl_ptr += count1;
1236 runtime->appl_ptr %= runtime->buffer_size;
1237 runtime->avail -= count1;
1238
1239 if (kernelbuf)
1240 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1241 if (userbuf) {
1242 spin_unlock_irqrestore(&substream->lock, flags);
1243 if (copy_to_user(userbuf + result,
1244 runtime->buffer + appl_ptr, count1))
1245 err = -EFAULT;
1246 spin_lock_irqsave(&substream->lock, flags);
1247 if (err)
1248 goto out;
1249 }
1250 result += count1;
1251 count -= count1;
1252 }
1253 out:
1254 snd_rawmidi_buffer_unref(runtime);
1255 spin_unlock_irqrestore(&substream->lock, flags);
1256 return result > 0 ? result : err;
1257}
1258
1259long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1260 unsigned char *buf, long count)
1261{
1262 snd_rawmidi_input_trigger(substream, 1);
1263 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1264}
1265EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1266
1267static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1268 loff_t *offset)
1269{
1270 long result;
1271 int count1;
1272 struct snd_rawmidi_file *rfile;
1273 struct snd_rawmidi_substream *substream;
1274 struct snd_rawmidi_runtime *runtime;
1275
1276 rfile = file->private_data;
1277 substream = rfile->input;
1278 if (substream == NULL)
1279 return -EIO;
1280 runtime = substream->runtime;
1281 snd_rawmidi_input_trigger(substream, 1);
1282 result = 0;
1283 while (count > 0) {
1284 spin_lock_irq(&substream->lock);
1285 while (!__snd_rawmidi_ready(runtime)) {
1286 wait_queue_entry_t wait;
1287
1288 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1289 spin_unlock_irq(&substream->lock);
1290 return result > 0 ? result : -EAGAIN;
1291 }
1292 init_waitqueue_entry(&wait, current);
1293 add_wait_queue(&runtime->sleep, &wait);
1294 set_current_state(TASK_INTERRUPTIBLE);
1295 spin_unlock_irq(&substream->lock);
1296 schedule();
1297 remove_wait_queue(&runtime->sleep, &wait);
1298 if (rfile->rmidi->card->shutdown)
1299 return -ENODEV;
1300 if (signal_pending(current))
1301 return result > 0 ? result : -ERESTARTSYS;
1302 spin_lock_irq(&substream->lock);
1303 if (!runtime->avail) {
1304 spin_unlock_irq(&substream->lock);
1305 return result > 0 ? result : -EIO;
1306 }
1307 }
1308 spin_unlock_irq(&substream->lock);
1309 count1 = snd_rawmidi_kernel_read1(substream,
1310 (unsigned char __user *)buf,
1311 NULL/*kernelbuf*/,
1312 count);
1313 if (count1 < 0)
1314 return result > 0 ? result : count1;
1315 result += count1;
1316 buf += count1;
1317 count -= count1;
1318 }
1319 return result;
1320}
1321
1322/**
1323 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1324 * @substream: the rawmidi substream
1325 *
1326 * Return: 1 if the internal output buffer is empty, 0 if not.
1327 */
1328int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1329{
1330 struct snd_rawmidi_runtime *runtime;
1331
1332 guard(spinlock_irqsave)(&substream->lock);
1333 runtime = substream->runtime;
1334 if (!substream->opened || !runtime || !runtime->buffer) {
1335 rmidi_dbg(substream->rmidi,
1336 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1337 return 1;
1338 }
1339 return (runtime->avail >= runtime->buffer_size);
1340}
1341EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1342
1343/*
1344 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1345 * @substream: the rawmidi substream
1346 * @buffer: the buffer pointer
1347 * @count: data size to transfer
1348 *
1349 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1350 */
1351static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1352 unsigned char *buffer, int count)
1353{
1354 int result, count1;
1355 struct snd_rawmidi_runtime *runtime = substream->runtime;
1356
1357 if (runtime->buffer == NULL) {
1358 rmidi_dbg(substream->rmidi,
1359 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1360 return -EINVAL;
1361 }
1362 result = 0;
1363 if (runtime->avail >= runtime->buffer_size) {
1364 /* warning: lowlevel layer MUST trigger down the hardware */
1365 goto __skip;
1366 }
1367 if (count == 1) { /* special case, faster code */
1368 *buffer = runtime->buffer[runtime->hw_ptr];
1369 result++;
1370 } else {
1371 count1 = runtime->buffer_size - runtime->hw_ptr;
1372 if (count1 > count)
1373 count1 = count;
1374 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1375 count1 = runtime->buffer_size - runtime->avail;
1376 count1 = get_aligned_size(runtime, count1);
1377 if (!count1)
1378 goto __skip;
1379 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1380 count -= count1;
1381 result += count1;
1382 if (count > 0) {
1383 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1384 count = runtime->buffer_size - runtime->avail - count1;
1385 count = get_aligned_size(runtime, count);
1386 if (!count)
1387 goto __skip;
1388 memcpy(buffer + count1, runtime->buffer, count);
1389 result += count;
1390 }
1391 }
1392 __skip:
1393 return result;
1394}
1395
1396/**
1397 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1398 * @substream: the rawmidi substream
1399 * @buffer: the buffer pointer
1400 * @count: data size to transfer
1401 *
1402 * Copies data from the internal output buffer to the given buffer.
1403 *
1404 * Call this in the interrupt handler when the midi output is ready,
1405 * and call snd_rawmidi_transmit_ack() after the transmission is
1406 * finished.
1407 *
1408 * Return: The size of copied data, or a negative error code on failure.
1409 */
1410int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1411 unsigned char *buffer, int count)
1412{
1413 guard(spinlock_irqsave)(&substream->lock);
1414 if (!substream->opened || !substream->runtime)
1415 return -EBADFD;
1416 return __snd_rawmidi_transmit_peek(substream, buffer, count);
1417}
1418EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1419
1420/*
1421 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1422 * @substream: the rawmidi substream
1423 * @count: the transferred count
1424 *
1425 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1426 */
1427static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1428 int count)
1429{
1430 struct snd_rawmidi_runtime *runtime = substream->runtime;
1431
1432 if (runtime->buffer == NULL) {
1433 rmidi_dbg(substream->rmidi,
1434 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1435 return -EINVAL;
1436 }
1437 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1438 count = get_aligned_size(runtime, count);
1439 runtime->hw_ptr += count;
1440 runtime->hw_ptr %= runtime->buffer_size;
1441 runtime->avail += count;
1442 substream->bytes += count;
1443 if (count > 0) {
1444 if (runtime->drain || __snd_rawmidi_ready(runtime))
1445 wake_up(&runtime->sleep);
1446 }
1447 return count;
1448}
1449
1450/**
1451 * snd_rawmidi_transmit_ack - acknowledge the transmission
1452 * @substream: the rawmidi substream
1453 * @count: the transferred count
1454 *
1455 * Advances the hardware pointer for the internal output buffer with
1456 * the given size and updates the condition.
1457 * Call after the transmission is finished.
1458 *
1459 * Return: The advanced size if successful, or a negative error code on failure.
1460 */
1461int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1462{
1463 guard(spinlock_irqsave)(&substream->lock);
1464 if (!substream->opened || !substream->runtime)
1465 return -EBADFD;
1466 return __snd_rawmidi_transmit_ack(substream, count);
1467}
1468EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1469
1470/**
1471 * snd_rawmidi_transmit - copy from the buffer to the device
1472 * @substream: the rawmidi substream
1473 * @buffer: the buffer pointer
1474 * @count: the data size to transfer
1475 *
1476 * Copies data from the buffer to the device and advances the pointer.
1477 *
1478 * Return: The copied size if successful, or a negative error code on failure.
1479 */
1480int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1481 unsigned char *buffer, int count)
1482{
1483 guard(spinlock_irqsave)(&substream->lock);
1484 if (!substream->opened)
1485 return -EBADFD;
1486 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1487 if (count <= 0)
1488 return count;
1489 return __snd_rawmidi_transmit_ack(substream, count);
1490}
1491EXPORT_SYMBOL(snd_rawmidi_transmit);
1492
1493/**
1494 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1495 * @substream: rawmidi substream
1496 *
1497 * Return: the number of discarded bytes
1498 */
1499int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1500{
1501 struct snd_rawmidi_runtime *runtime;
1502 int count = 0;
1503
1504 guard(spinlock_irqsave)(&substream->lock);
1505 runtime = substream->runtime;
1506 if (substream->opened && runtime &&
1507 runtime->avail < runtime->buffer_size) {
1508 count = runtime->buffer_size - runtime->avail;
1509 __snd_rawmidi_transmit_ack(substream, count);
1510 }
1511 return count;
1512}
1513EXPORT_SYMBOL(snd_rawmidi_proceed);
1514
1515static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1516 const unsigned char __user *userbuf,
1517 const unsigned char *kernelbuf,
1518 long count)
1519{
1520 unsigned long flags;
1521 long count1, result;
1522 struct snd_rawmidi_runtime *runtime = substream->runtime;
1523 unsigned long appl_ptr;
1524
1525 if (!kernelbuf && !userbuf)
1526 return -EINVAL;
1527 if (snd_BUG_ON(!runtime->buffer))
1528 return -EINVAL;
1529
1530 result = 0;
1531 spin_lock_irqsave(&substream->lock, flags);
1532 if (substream->append) {
1533 if ((long)runtime->avail < count) {
1534 spin_unlock_irqrestore(&substream->lock, flags);
1535 return -EAGAIN;
1536 }
1537 }
1538 snd_rawmidi_buffer_ref(runtime);
1539 while (count > 0 && runtime->avail > 0) {
1540 count1 = runtime->buffer_size - runtime->appl_ptr;
1541 if (count1 > count)
1542 count1 = count;
1543 if (count1 > (long)runtime->avail)
1544 count1 = runtime->avail;
1545
1546 /* update runtime->appl_ptr before unlocking for userbuf */
1547 appl_ptr = runtime->appl_ptr;
1548 runtime->appl_ptr += count1;
1549 runtime->appl_ptr %= runtime->buffer_size;
1550 runtime->avail -= count1;
1551
1552 if (kernelbuf)
1553 memcpy(runtime->buffer + appl_ptr,
1554 kernelbuf + result, count1);
1555 else if (userbuf) {
1556 spin_unlock_irqrestore(&substream->lock, flags);
1557 if (copy_from_user(runtime->buffer + appl_ptr,
1558 userbuf + result, count1)) {
1559 spin_lock_irqsave(&substream->lock, flags);
1560 result = result > 0 ? result : -EFAULT;
1561 goto __end;
1562 }
1563 spin_lock_irqsave(&substream->lock, flags);
1564 }
1565 result += count1;
1566 count -= count1;
1567 }
1568 __end:
1569 count1 = runtime->avail < runtime->buffer_size;
1570 snd_rawmidi_buffer_unref(runtime);
1571 spin_unlock_irqrestore(&substream->lock, flags);
1572 if (count1)
1573 snd_rawmidi_output_trigger(substream, 1);
1574 return result;
1575}
1576
1577long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1578 const unsigned char *buf, long count)
1579{
1580 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1581}
1582EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1583
1584static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1585 size_t count, loff_t *offset)
1586{
1587 long result, timeout;
1588 int count1;
1589 struct snd_rawmidi_file *rfile;
1590 struct snd_rawmidi_runtime *runtime;
1591 struct snd_rawmidi_substream *substream;
1592
1593 rfile = file->private_data;
1594 substream = rfile->output;
1595 runtime = substream->runtime;
1596 /* we cannot put an atomic message to our buffer */
1597 if (substream->append && count > runtime->buffer_size)
1598 return -EIO;
1599 result = 0;
1600 while (count > 0) {
1601 spin_lock_irq(&substream->lock);
1602 while (!snd_rawmidi_ready_append(substream, count)) {
1603 wait_queue_entry_t wait;
1604
1605 if (file->f_flags & O_NONBLOCK) {
1606 spin_unlock_irq(&substream->lock);
1607 return result > 0 ? result : -EAGAIN;
1608 }
1609 init_waitqueue_entry(&wait, current);
1610 add_wait_queue(&runtime->sleep, &wait);
1611 set_current_state(TASK_INTERRUPTIBLE);
1612 spin_unlock_irq(&substream->lock);
1613 timeout = schedule_timeout(30 * HZ);
1614 remove_wait_queue(&runtime->sleep, &wait);
1615 if (rfile->rmidi->card->shutdown)
1616 return -ENODEV;
1617 if (signal_pending(current))
1618 return result > 0 ? result : -ERESTARTSYS;
1619 spin_lock_irq(&substream->lock);
1620 if (!runtime->avail && !timeout) {
1621 spin_unlock_irq(&substream->lock);
1622 return result > 0 ? result : -EIO;
1623 }
1624 }
1625 spin_unlock_irq(&substream->lock);
1626 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1627 if (count1 < 0)
1628 return result > 0 ? result : count1;
1629 result += count1;
1630 buf += count1;
1631 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1632 break;
1633 count -= count1;
1634 }
1635 if (file->f_flags & O_DSYNC) {
1636 spin_lock_irq(&substream->lock);
1637 while (runtime->avail != runtime->buffer_size) {
1638 wait_queue_entry_t wait;
1639 unsigned int last_avail = runtime->avail;
1640
1641 init_waitqueue_entry(&wait, current);
1642 add_wait_queue(&runtime->sleep, &wait);
1643 set_current_state(TASK_INTERRUPTIBLE);
1644 spin_unlock_irq(&substream->lock);
1645 timeout = schedule_timeout(30 * HZ);
1646 remove_wait_queue(&runtime->sleep, &wait);
1647 if (signal_pending(current))
1648 return result > 0 ? result : -ERESTARTSYS;
1649 if (runtime->avail == last_avail && !timeout)
1650 return result > 0 ? result : -EIO;
1651 spin_lock_irq(&substream->lock);
1652 }
1653 spin_unlock_irq(&substream->lock);
1654 }
1655 return result;
1656}
1657
1658static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1659{
1660 struct snd_rawmidi_file *rfile;
1661 struct snd_rawmidi_runtime *runtime;
1662 __poll_t mask;
1663
1664 rfile = file->private_data;
1665 if (rfile->input != NULL) {
1666 runtime = rfile->input->runtime;
1667 snd_rawmidi_input_trigger(rfile->input, 1);
1668 poll_wait(file, &runtime->sleep, wait);
1669 }
1670 if (rfile->output != NULL) {
1671 runtime = rfile->output->runtime;
1672 poll_wait(file, &runtime->sleep, wait);
1673 }
1674 mask = 0;
1675 if (rfile->input != NULL) {
1676 if (snd_rawmidi_ready(rfile->input))
1677 mask |= EPOLLIN | EPOLLRDNORM;
1678 }
1679 if (rfile->output != NULL) {
1680 if (snd_rawmidi_ready(rfile->output))
1681 mask |= EPOLLOUT | EPOLLWRNORM;
1682 }
1683 return mask;
1684}
1685
1686/*
1687 */
1688#ifdef CONFIG_COMPAT
1689#include "rawmidi_compat.c"
1690#else
1691#define snd_rawmidi_ioctl_compat NULL
1692#endif
1693
1694/*
1695 */
1696
1697static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1698 struct snd_info_buffer *buffer)
1699{
1700 struct snd_rawmidi *rmidi;
1701 struct snd_rawmidi_substream *substream;
1702 struct snd_rawmidi_runtime *runtime;
1703 unsigned long buffer_size, avail, xruns;
1704 unsigned int clock_type;
1705 static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1706
1707 rmidi = entry->private_data;
1708 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1709 if (IS_ENABLED(CONFIG_SND_UMP))
1710 snd_iprintf(buffer, "Type: %s\n",
1711 rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
1712 if (rmidi->ops && rmidi->ops->proc_read)
1713 rmidi->ops->proc_read(entry, buffer);
1714 guard(mutex)(&rmidi->open_mutex);
1715 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1716 list_for_each_entry(substream,
1717 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1718 list) {
1719 snd_iprintf(buffer,
1720 "Output %d\n"
1721 " Tx bytes : %lu\n",
1722 substream->number,
1723 (unsigned long) substream->bytes);
1724 if (substream->opened) {
1725 snd_iprintf(buffer,
1726 " Owner PID : %d\n",
1727 pid_vnr(substream->pid));
1728 runtime = substream->runtime;
1729 scoped_guard(spinlock_irq, &substream->lock) {
1730 buffer_size = runtime->buffer_size;
1731 avail = runtime->avail;
1732 }
1733 snd_iprintf(buffer,
1734 " Mode : %s\n"
1735 " Buffer size : %lu\n"
1736 " Avail : %lu\n",
1737 runtime->oss ? "OSS compatible" : "native",
1738 buffer_size, avail);
1739 }
1740 }
1741 }
1742 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1743 list_for_each_entry(substream,
1744 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1745 list) {
1746 snd_iprintf(buffer,
1747 "Input %d\n"
1748 " Rx bytes : %lu\n",
1749 substream->number,
1750 (unsigned long) substream->bytes);
1751 if (substream->opened) {
1752 snd_iprintf(buffer,
1753 " Owner PID : %d\n",
1754 pid_vnr(substream->pid));
1755 runtime = substream->runtime;
1756 scoped_guard(spinlock_irq, &substream->lock) {
1757 buffer_size = runtime->buffer_size;
1758 avail = runtime->avail;
1759 xruns = runtime->xruns;
1760 }
1761 snd_iprintf(buffer,
1762 " Buffer size : %lu\n"
1763 " Avail : %lu\n"
1764 " Overruns : %lu\n",
1765 buffer_size, avail, xruns);
1766 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1767 clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1768 if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1769 snd_iprintf(buffer,
1770 " Framing : tstamp\n"
1771 " Clock type : %s\n",
1772 clock_names[clock_type]);
1773 }
1774 }
1775 }
1776 }
1777}
1778
1779/*
1780 * Register functions
1781 */
1782
1783static const struct file_operations snd_rawmidi_f_ops = {
1784 .owner = THIS_MODULE,
1785 .read = snd_rawmidi_read,
1786 .write = snd_rawmidi_write,
1787 .open = snd_rawmidi_open,
1788 .release = snd_rawmidi_release,
1789 .poll = snd_rawmidi_poll,
1790 .unlocked_ioctl = snd_rawmidi_ioctl,
1791 .compat_ioctl = snd_rawmidi_ioctl_compat,
1792};
1793
1794static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1795 struct snd_rawmidi_str *stream,
1796 int direction,
1797 int count)
1798{
1799 struct snd_rawmidi_substream *substream;
1800 int idx;
1801
1802 for (idx = 0; idx < count; idx++) {
1803 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1804 if (!substream)
1805 return -ENOMEM;
1806 substream->stream = direction;
1807 substream->number = idx;
1808 substream->rmidi = rmidi;
1809 substream->pstr = stream;
1810 spin_lock_init(&substream->lock);
1811 list_add_tail(&substream->list, &stream->substreams);
1812 stream->substream_count++;
1813 }
1814 return 0;
1815}
1816
1817/* used for both rawmidi and ump */
1818int snd_rawmidi_init(struct snd_rawmidi *rmidi,
1819 struct snd_card *card, char *id, int device,
1820 int output_count, int input_count,
1821 unsigned int info_flags)
1822{
1823 int err;
1824 static const struct snd_device_ops ops = {
1825 .dev_free = snd_rawmidi_dev_free,
1826 .dev_register = snd_rawmidi_dev_register,
1827 .dev_disconnect = snd_rawmidi_dev_disconnect,
1828 };
1829
1830 rmidi->card = card;
1831 rmidi->device = device;
1832 mutex_init(&rmidi->open_mutex);
1833 init_waitqueue_head(&rmidi->open_wait);
1834 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1835 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1836 rmidi->info_flags = info_flags;
1837
1838 if (id != NULL)
1839 strscpy(rmidi->id, id, sizeof(rmidi->id));
1840
1841 err = snd_device_alloc(&rmidi->dev, card);
1842 if (err < 0)
1843 return err;
1844 if (rawmidi_is_ump(rmidi))
1845 dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);
1846 else
1847 dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);
1848
1849 err = snd_rawmidi_alloc_substreams(rmidi,
1850 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1851 SNDRV_RAWMIDI_STREAM_INPUT,
1852 input_count);
1853 if (err < 0)
1854 return err;
1855 err = snd_rawmidi_alloc_substreams(rmidi,
1856 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1857 SNDRV_RAWMIDI_STREAM_OUTPUT,
1858 output_count);
1859 if (err < 0)
1860 return err;
1861 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1862 if (err < 0)
1863 return err;
1864 return 0;
1865}
1866EXPORT_SYMBOL_GPL(snd_rawmidi_init);
1867
1868/**
1869 * snd_rawmidi_new - create a rawmidi instance
1870 * @card: the card instance
1871 * @id: the id string
1872 * @device: the device index
1873 * @output_count: the number of output streams
1874 * @input_count: the number of input streams
1875 * @rrawmidi: the pointer to store the new rawmidi instance
1876 *
1877 * Creates a new rawmidi instance.
1878 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1879 *
1880 * Return: Zero if successful, or a negative error code on failure.
1881 */
1882int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1883 int output_count, int input_count,
1884 struct snd_rawmidi **rrawmidi)
1885{
1886 struct snd_rawmidi *rmidi;
1887 int err;
1888
1889 if (rrawmidi)
1890 *rrawmidi = NULL;
1891 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1892 if (!rmidi)
1893 return -ENOMEM;
1894 err = snd_rawmidi_init(rmidi, card, id, device,
1895 output_count, input_count, 0);
1896 if (err < 0) {
1897 snd_rawmidi_free(rmidi);
1898 return err;
1899 }
1900 if (rrawmidi)
1901 *rrawmidi = rmidi;
1902 return 0;
1903}
1904EXPORT_SYMBOL(snd_rawmidi_new);
1905
1906static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1907{
1908 struct snd_rawmidi_substream *substream;
1909
1910 while (!list_empty(&stream->substreams)) {
1911 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1912 list_del(&substream->list);
1913 kfree(substream);
1914 }
1915}
1916
1917/* called from ump.c, too */
1918int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1919{
1920 if (!rmidi)
1921 return 0;
1922
1923 snd_info_free_entry(rmidi->proc_entry);
1924 rmidi->proc_entry = NULL;
1925 if (rmidi->ops && rmidi->ops->dev_unregister)
1926 rmidi->ops->dev_unregister(rmidi);
1927
1928 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1929 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1930 if (rmidi->private_free)
1931 rmidi->private_free(rmidi);
1932 put_device(rmidi->dev);
1933 kfree(rmidi);
1934 return 0;
1935}
1936EXPORT_SYMBOL_GPL(snd_rawmidi_free);
1937
1938static int snd_rawmidi_dev_free(struct snd_device *device)
1939{
1940 struct snd_rawmidi *rmidi = device->device_data;
1941
1942 return snd_rawmidi_free(rmidi);
1943}
1944
1945#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1946static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1947{
1948 struct snd_rawmidi *rmidi = device->private_data;
1949
1950 rmidi->seq_dev = NULL;
1951}
1952#endif
1953
1954static int snd_rawmidi_dev_register(struct snd_device *device)
1955{
1956 int err;
1957 struct snd_info_entry *entry;
1958 char name[16];
1959 struct snd_rawmidi *rmidi = device->device_data;
1960
1961 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1962 return -ENOMEM;
1963 err = 0;
1964 scoped_guard(mutex, ®ister_mutex) {
1965 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1966 err = -EBUSY;
1967 else
1968 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1969 }
1970 if (err < 0)
1971 return err;
1972
1973 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1974 rmidi->card, rmidi->device,
1975 &snd_rawmidi_f_ops, rmidi, rmidi->dev);
1976 if (err < 0) {
1977 rmidi_err(rmidi, "unable to register\n");
1978 goto error;
1979 }
1980 if (rmidi->ops && rmidi->ops->dev_register) {
1981 err = rmidi->ops->dev_register(rmidi);
1982 if (err < 0)
1983 goto error_unregister;
1984 }
1985#ifdef CONFIG_SND_OSSEMUL
1986 rmidi->ossreg = 0;
1987 if (!rawmidi_is_ump(rmidi) &&
1988 (int)rmidi->device == midi_map[rmidi->card->number]) {
1989 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1990 rmidi->card, 0, &snd_rawmidi_f_ops,
1991 rmidi) < 0) {
1992 rmidi_err(rmidi,
1993 "unable to register OSS rawmidi device %i:%i\n",
1994 rmidi->card->number, 0);
1995 } else {
1996 rmidi->ossreg++;
1997#ifdef SNDRV_OSS_INFO_DEV_MIDI
1998 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1999#endif
2000 }
2001 }
2002 if (!rawmidi_is_ump(rmidi) &&
2003 (int)rmidi->device == amidi_map[rmidi->card->number]) {
2004 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2005 rmidi->card, 1, &snd_rawmidi_f_ops,
2006 rmidi) < 0) {
2007 rmidi_err(rmidi,
2008 "unable to register OSS rawmidi device %i:%i\n",
2009 rmidi->card->number, 1);
2010 } else {
2011 rmidi->ossreg++;
2012 }
2013 }
2014#endif /* CONFIG_SND_OSSEMUL */
2015 sprintf(name, "midi%d", rmidi->device);
2016 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
2017 if (entry) {
2018 entry->private_data = rmidi;
2019 entry->c.text.read = snd_rawmidi_proc_info_read;
2020 if (snd_info_register(entry) < 0) {
2021 snd_info_free_entry(entry);
2022 entry = NULL;
2023 }
2024 }
2025 rmidi->proc_entry = entry;
2026#if IS_ENABLED(CONFIG_SND_SEQUENCER)
2027 /* no own registration mechanism? */
2028 if (!rmidi->ops || !rmidi->ops->dev_register) {
2029 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2030 rmidi->seq_dev->private_data = rmidi;
2031 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2032 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2033 snd_device_register(rmidi->card, rmidi->seq_dev);
2034 }
2035 }
2036#endif
2037 return 0;
2038
2039 error_unregister:
2040 snd_unregister_device(rmidi->dev);
2041 error:
2042 scoped_guard(mutex, ®ister_mutex)
2043 list_del(&rmidi->list);
2044 return err;
2045}
2046
2047static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2048{
2049 struct snd_rawmidi *rmidi = device->device_data;
2050 int dir;
2051
2052 guard(mutex)(®ister_mutex);
2053 guard(mutex)(&rmidi->open_mutex);
2054 wake_up(&rmidi->open_wait);
2055 list_del_init(&rmidi->list);
2056 for (dir = 0; dir < 2; dir++) {
2057 struct snd_rawmidi_substream *s;
2058
2059 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2060 if (s->runtime)
2061 wake_up(&s->runtime->sleep);
2062 }
2063 }
2064
2065#ifdef CONFIG_SND_OSSEMUL
2066 if (rmidi->ossreg) {
2067 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2068 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2069#ifdef SNDRV_OSS_INFO_DEV_MIDI
2070 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2071#endif
2072 }
2073 if ((int)rmidi->device == amidi_map[rmidi->card->number])
2074 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2075 rmidi->ossreg = 0;
2076 }
2077#endif /* CONFIG_SND_OSSEMUL */
2078 snd_unregister_device(rmidi->dev);
2079 return 0;
2080}
2081
2082/**
2083 * snd_rawmidi_set_ops - set the rawmidi operators
2084 * @rmidi: the rawmidi instance
2085 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2086 * @ops: the operator table
2087 *
2088 * Sets the rawmidi operators for the given stream direction.
2089 */
2090void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2091 const struct snd_rawmidi_ops *ops)
2092{
2093 struct snd_rawmidi_substream *substream;
2094
2095 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2096 substream->ops = ops;
2097}
2098EXPORT_SYMBOL(snd_rawmidi_set_ops);
2099
2100/*
2101 * ENTRY functions
2102 */
2103
2104static int __init alsa_rawmidi_init(void)
2105{
2106
2107 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2108 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2109#ifdef CONFIG_SND_OSSEMUL
2110 { int i;
2111 /* check device map table */
2112 for (i = 0; i < SNDRV_CARDS; i++) {
2113 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2114 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2115 i, midi_map[i]);
2116 midi_map[i] = 0;
2117 }
2118 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2119 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2120 i, amidi_map[i]);
2121 amidi_map[i] = 1;
2122 }
2123 }
2124 }
2125#endif /* CONFIG_SND_OSSEMUL */
2126 return 0;
2127}
2128
2129static void __exit alsa_rawmidi_exit(void)
2130{
2131 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2132 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2133}
2134
2135module_init(alsa_rawmidi_init)
2136module_exit(alsa_rawmidi_exit)