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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/signal.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_entry_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
582static int __snd_rawmidi_info_select(struct snd_card *card,
583 struct snd_rawmidi_info *info)
584{
585 struct snd_rawmidi *rmidi;
586 struct snd_rawmidi_str *pstr;
587 struct snd_rawmidi_substream *substream;
588
589 rmidi = snd_rawmidi_search(card, info->device);
590 if (!rmidi)
591 return -ENXIO;
592 if (info->stream < 0 || info->stream > 1)
593 return -EINVAL;
594 pstr = &rmidi->streams[info->stream];
595 if (pstr->substream_count == 0)
596 return -ENOENT;
597 if (info->subdevice >= pstr->substream_count)
598 return -ENXIO;
599 list_for_each_entry(substream, &pstr->substreams, list) {
600 if ((unsigned int)substream->number == info->subdevice)
601 return snd_rawmidi_info(substream, info);
602 }
603 return -ENXIO;
604}
605
606int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
607{
608 int ret;
609
610 mutex_lock(®ister_mutex);
611 ret = __snd_rawmidi_info_select(card, info);
612 mutex_unlock(®ister_mutex);
613 return ret;
614}
615EXPORT_SYMBOL(snd_rawmidi_info_select);
616
617static int snd_rawmidi_info_select_user(struct snd_card *card,
618 struct snd_rawmidi_info __user *_info)
619{
620 int err;
621 struct snd_rawmidi_info info;
622 if (get_user(info.device, &_info->device))
623 return -EFAULT;
624 if (get_user(info.stream, &_info->stream))
625 return -EFAULT;
626 if (get_user(info.subdevice, &_info->subdevice))
627 return -EFAULT;
628 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
629 return err;
630 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
631 return -EFAULT;
632 return 0;
633}
634
635int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
636 struct snd_rawmidi_params * params)
637{
638 char *newbuf;
639 struct snd_rawmidi_runtime *runtime = substream->runtime;
640
641 if (substream->append && substream->use_count > 1)
642 return -EBUSY;
643 snd_rawmidi_drain_output(substream);
644 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
645 return -EINVAL;
646 }
647 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
648 return -EINVAL;
649 }
650 if (params->buffer_size != runtime->buffer_size) {
651 newbuf = krealloc(runtime->buffer, params->buffer_size,
652 GFP_KERNEL);
653 if (!newbuf)
654 return -ENOMEM;
655 runtime->buffer = newbuf;
656 runtime->buffer_size = params->buffer_size;
657 runtime->avail = runtime->buffer_size;
658 }
659 runtime->avail_min = params->avail_min;
660 substream->active_sensing = !params->no_active_sensing;
661 return 0;
662}
663EXPORT_SYMBOL(snd_rawmidi_output_params);
664
665int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
666 struct snd_rawmidi_params * params)
667{
668 char *newbuf;
669 struct snd_rawmidi_runtime *runtime = substream->runtime;
670
671 snd_rawmidi_drain_input(substream);
672 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
673 return -EINVAL;
674 }
675 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
676 return -EINVAL;
677 }
678 if (params->buffer_size != runtime->buffer_size) {
679 newbuf = krealloc(runtime->buffer, params->buffer_size,
680 GFP_KERNEL);
681 if (!newbuf)
682 return -ENOMEM;
683 runtime->buffer = newbuf;
684 runtime->buffer_size = params->buffer_size;
685 }
686 runtime->avail_min = params->avail_min;
687 return 0;
688}
689EXPORT_SYMBOL(snd_rawmidi_input_params);
690
691static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
692 struct snd_rawmidi_status * status)
693{
694 struct snd_rawmidi_runtime *runtime = substream->runtime;
695
696 memset(status, 0, sizeof(*status));
697 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
698 spin_lock_irq(&runtime->lock);
699 status->avail = runtime->avail;
700 spin_unlock_irq(&runtime->lock);
701 return 0;
702}
703
704static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
705 struct snd_rawmidi_status * status)
706{
707 struct snd_rawmidi_runtime *runtime = substream->runtime;
708
709 memset(status, 0, sizeof(*status));
710 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
711 spin_lock_irq(&runtime->lock);
712 status->avail = runtime->avail;
713 status->xruns = runtime->xruns;
714 runtime->xruns = 0;
715 spin_unlock_irq(&runtime->lock);
716 return 0;
717}
718
719static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
720{
721 struct snd_rawmidi_file *rfile;
722 void __user *argp = (void __user *)arg;
723
724 rfile = file->private_data;
725 if (((cmd >> 8) & 0xff) != 'W')
726 return -ENOTTY;
727 switch (cmd) {
728 case SNDRV_RAWMIDI_IOCTL_PVERSION:
729 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
730 case SNDRV_RAWMIDI_IOCTL_INFO:
731 {
732 int stream;
733 struct snd_rawmidi_info __user *info = argp;
734 if (get_user(stream, &info->stream))
735 return -EFAULT;
736 switch (stream) {
737 case SNDRV_RAWMIDI_STREAM_INPUT:
738 return snd_rawmidi_info_user(rfile->input, info);
739 case SNDRV_RAWMIDI_STREAM_OUTPUT:
740 return snd_rawmidi_info_user(rfile->output, info);
741 default:
742 return -EINVAL;
743 }
744 }
745 case SNDRV_RAWMIDI_IOCTL_PARAMS:
746 {
747 struct snd_rawmidi_params params;
748 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
749 return -EFAULT;
750 switch (params.stream) {
751 case SNDRV_RAWMIDI_STREAM_OUTPUT:
752 if (rfile->output == NULL)
753 return -EINVAL;
754 return snd_rawmidi_output_params(rfile->output, ¶ms);
755 case SNDRV_RAWMIDI_STREAM_INPUT:
756 if (rfile->input == NULL)
757 return -EINVAL;
758 return snd_rawmidi_input_params(rfile->input, ¶ms);
759 default:
760 return -EINVAL;
761 }
762 }
763 case SNDRV_RAWMIDI_IOCTL_STATUS:
764 {
765 int err = 0;
766 struct snd_rawmidi_status status;
767 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
768 return -EFAULT;
769 switch (status.stream) {
770 case SNDRV_RAWMIDI_STREAM_OUTPUT:
771 if (rfile->output == NULL)
772 return -EINVAL;
773 err = snd_rawmidi_output_status(rfile->output, &status);
774 break;
775 case SNDRV_RAWMIDI_STREAM_INPUT:
776 if (rfile->input == NULL)
777 return -EINVAL;
778 err = snd_rawmidi_input_status(rfile->input, &status);
779 break;
780 default:
781 return -EINVAL;
782 }
783 if (err < 0)
784 return err;
785 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
786 return -EFAULT;
787 return 0;
788 }
789 case SNDRV_RAWMIDI_IOCTL_DROP:
790 {
791 int val;
792 if (get_user(val, (int __user *) argp))
793 return -EFAULT;
794 switch (val) {
795 case SNDRV_RAWMIDI_STREAM_OUTPUT:
796 if (rfile->output == NULL)
797 return -EINVAL;
798 return snd_rawmidi_drop_output(rfile->output);
799 default:
800 return -EINVAL;
801 }
802 }
803 case SNDRV_RAWMIDI_IOCTL_DRAIN:
804 {
805 int val;
806 if (get_user(val, (int __user *) argp))
807 return -EFAULT;
808 switch (val) {
809 case SNDRV_RAWMIDI_STREAM_OUTPUT:
810 if (rfile->output == NULL)
811 return -EINVAL;
812 return snd_rawmidi_drain_output(rfile->output);
813 case SNDRV_RAWMIDI_STREAM_INPUT:
814 if (rfile->input == NULL)
815 return -EINVAL;
816 return snd_rawmidi_drain_input(rfile->input);
817 default:
818 return -EINVAL;
819 }
820 }
821 default:
822 rmidi_dbg(rfile->rmidi,
823 "rawmidi: unknown command = 0x%x\n", cmd);
824 }
825 return -ENOTTY;
826}
827
828static int snd_rawmidi_control_ioctl(struct snd_card *card,
829 struct snd_ctl_file *control,
830 unsigned int cmd,
831 unsigned long arg)
832{
833 void __user *argp = (void __user *)arg;
834
835 switch (cmd) {
836 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
837 {
838 int device;
839
840 if (get_user(device, (int __user *)argp))
841 return -EFAULT;
842 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
843 device = SNDRV_RAWMIDI_DEVICES - 1;
844 mutex_lock(®ister_mutex);
845 device = device < 0 ? 0 : device + 1;
846 while (device < SNDRV_RAWMIDI_DEVICES) {
847 if (snd_rawmidi_search(card, device))
848 break;
849 device++;
850 }
851 if (device == SNDRV_RAWMIDI_DEVICES)
852 device = -1;
853 mutex_unlock(®ister_mutex);
854 if (put_user(device, (int __user *)argp))
855 return -EFAULT;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
859 {
860 int val;
861
862 if (get_user(val, (int __user *)argp))
863 return -EFAULT;
864 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
865 return 0;
866 }
867 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
868 return snd_rawmidi_info_select_user(card, argp);
869 }
870 return -ENOIOCTLCMD;
871}
872
873/**
874 * snd_rawmidi_receive - receive the input data from the device
875 * @substream: the rawmidi substream
876 * @buffer: the buffer pointer
877 * @count: the data size to read
878 *
879 * Reads the data from the internal buffer.
880 *
881 * Return: The size of read data, or a negative error code on failure.
882 */
883int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
884 const unsigned char *buffer, int count)
885{
886 unsigned long flags;
887 int result = 0, count1;
888 struct snd_rawmidi_runtime *runtime = substream->runtime;
889
890 if (!substream->opened)
891 return -EBADFD;
892 if (runtime->buffer == NULL) {
893 rmidi_dbg(substream->rmidi,
894 "snd_rawmidi_receive: input is not active!!!\n");
895 return -EINVAL;
896 }
897 spin_lock_irqsave(&runtime->lock, flags);
898 if (count == 1) { /* special case, faster code */
899 substream->bytes++;
900 if (runtime->avail < runtime->buffer_size) {
901 runtime->buffer[runtime->hw_ptr++] = buffer[0];
902 runtime->hw_ptr %= runtime->buffer_size;
903 runtime->avail++;
904 result++;
905 } else {
906 runtime->xruns++;
907 }
908 } else {
909 substream->bytes += count;
910 count1 = runtime->buffer_size - runtime->hw_ptr;
911 if (count1 > count)
912 count1 = count;
913 if (count1 > (int)(runtime->buffer_size - runtime->avail))
914 count1 = runtime->buffer_size - runtime->avail;
915 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
916 runtime->hw_ptr += count1;
917 runtime->hw_ptr %= runtime->buffer_size;
918 runtime->avail += count1;
919 count -= count1;
920 result += count1;
921 if (count > 0) {
922 buffer += count1;
923 count1 = count;
924 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
925 count1 = runtime->buffer_size - runtime->avail;
926 runtime->xruns += count - count1;
927 }
928 if (count1 > 0) {
929 memcpy(runtime->buffer, buffer, count1);
930 runtime->hw_ptr = count1;
931 runtime->avail += count1;
932 result += count1;
933 }
934 }
935 }
936 if (result > 0) {
937 if (runtime->event)
938 schedule_work(&runtime->event_work);
939 else if (snd_rawmidi_ready(substream))
940 wake_up(&runtime->sleep);
941 }
942 spin_unlock_irqrestore(&runtime->lock, flags);
943 return result;
944}
945EXPORT_SYMBOL(snd_rawmidi_receive);
946
947static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
948 unsigned char __user *userbuf,
949 unsigned char *kernelbuf, long count)
950{
951 unsigned long flags;
952 long result = 0, count1;
953 struct snd_rawmidi_runtime *runtime = substream->runtime;
954 unsigned long appl_ptr;
955
956 spin_lock_irqsave(&runtime->lock, flags);
957 while (count > 0 && runtime->avail) {
958 count1 = runtime->buffer_size - runtime->appl_ptr;
959 if (count1 > count)
960 count1 = count;
961 if (count1 > (int)runtime->avail)
962 count1 = runtime->avail;
963
964 /* update runtime->appl_ptr before unlocking for userbuf */
965 appl_ptr = runtime->appl_ptr;
966 runtime->appl_ptr += count1;
967 runtime->appl_ptr %= runtime->buffer_size;
968 runtime->avail -= count1;
969
970 if (kernelbuf)
971 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
972 if (userbuf) {
973 spin_unlock_irqrestore(&runtime->lock, flags);
974 if (copy_to_user(userbuf + result,
975 runtime->buffer + appl_ptr, count1)) {
976 return result > 0 ? result : -EFAULT;
977 }
978 spin_lock_irqsave(&runtime->lock, flags);
979 }
980 result += count1;
981 count -= count1;
982 }
983 spin_unlock_irqrestore(&runtime->lock, flags);
984 return result;
985}
986
987long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
988 unsigned char *buf, long count)
989{
990 snd_rawmidi_input_trigger(substream, 1);
991 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
992}
993EXPORT_SYMBOL(snd_rawmidi_kernel_read);
994
995static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
996 loff_t *offset)
997{
998 long result;
999 int count1;
1000 struct snd_rawmidi_file *rfile;
1001 struct snd_rawmidi_substream *substream;
1002 struct snd_rawmidi_runtime *runtime;
1003
1004 rfile = file->private_data;
1005 substream = rfile->input;
1006 if (substream == NULL)
1007 return -EIO;
1008 runtime = substream->runtime;
1009 snd_rawmidi_input_trigger(substream, 1);
1010 result = 0;
1011 while (count > 0) {
1012 spin_lock_irq(&runtime->lock);
1013 while (!snd_rawmidi_ready(substream)) {
1014 wait_queue_entry_t wait;
1015 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1016 spin_unlock_irq(&runtime->lock);
1017 return result > 0 ? result : -EAGAIN;
1018 }
1019 init_waitqueue_entry(&wait, current);
1020 add_wait_queue(&runtime->sleep, &wait);
1021 set_current_state(TASK_INTERRUPTIBLE);
1022 spin_unlock_irq(&runtime->lock);
1023 schedule();
1024 remove_wait_queue(&runtime->sleep, &wait);
1025 if (rfile->rmidi->card->shutdown)
1026 return -ENODEV;
1027 if (signal_pending(current))
1028 return result > 0 ? result : -ERESTARTSYS;
1029 if (!runtime->avail)
1030 return result > 0 ? result : -EIO;
1031 spin_lock_irq(&runtime->lock);
1032 }
1033 spin_unlock_irq(&runtime->lock);
1034 count1 = snd_rawmidi_kernel_read1(substream,
1035 (unsigned char __user *)buf,
1036 NULL/*kernelbuf*/,
1037 count);
1038 if (count1 < 0)
1039 return result > 0 ? result : count1;
1040 result += count1;
1041 buf += count1;
1042 count -= count1;
1043 }
1044 return result;
1045}
1046
1047/**
1048 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1049 * @substream: the rawmidi substream
1050 *
1051 * Return: 1 if the internal output buffer is empty, 0 if not.
1052 */
1053int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1054{
1055 struct snd_rawmidi_runtime *runtime = substream->runtime;
1056 int result;
1057 unsigned long flags;
1058
1059 if (runtime->buffer == NULL) {
1060 rmidi_dbg(substream->rmidi,
1061 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1062 return 1;
1063 }
1064 spin_lock_irqsave(&runtime->lock, flags);
1065 result = runtime->avail >= runtime->buffer_size;
1066 spin_unlock_irqrestore(&runtime->lock, flags);
1067 return result;
1068}
1069EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1070
1071/**
1072 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1073 * @substream: the rawmidi substream
1074 * @buffer: the buffer pointer
1075 * @count: data size to transfer
1076 *
1077 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1078 */
1079int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1080 unsigned char *buffer, int count)
1081{
1082 int result, count1;
1083 struct snd_rawmidi_runtime *runtime = substream->runtime;
1084
1085 if (runtime->buffer == NULL) {
1086 rmidi_dbg(substream->rmidi,
1087 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1088 return -EINVAL;
1089 }
1090 result = 0;
1091 if (runtime->avail >= runtime->buffer_size) {
1092 /* warning: lowlevel layer MUST trigger down the hardware */
1093 goto __skip;
1094 }
1095 if (count == 1) { /* special case, faster code */
1096 *buffer = runtime->buffer[runtime->hw_ptr];
1097 result++;
1098 } else {
1099 count1 = runtime->buffer_size - runtime->hw_ptr;
1100 if (count1 > count)
1101 count1 = count;
1102 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1103 count1 = runtime->buffer_size - runtime->avail;
1104 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1105 count -= count1;
1106 result += count1;
1107 if (count > 0) {
1108 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1109 count = runtime->buffer_size - runtime->avail - count1;
1110 memcpy(buffer + count1, runtime->buffer, count);
1111 result += count;
1112 }
1113 }
1114 __skip:
1115 return result;
1116}
1117EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1118
1119/**
1120 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1121 * @substream: the rawmidi substream
1122 * @buffer: the buffer pointer
1123 * @count: data size to transfer
1124 *
1125 * Copies data from the internal output buffer to the given buffer.
1126 *
1127 * Call this in the interrupt handler when the midi output is ready,
1128 * and call snd_rawmidi_transmit_ack() after the transmission is
1129 * finished.
1130 *
1131 * Return: The size of copied data, or a negative error code on failure.
1132 */
1133int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1134 unsigned char *buffer, int count)
1135{
1136 struct snd_rawmidi_runtime *runtime = substream->runtime;
1137 int result;
1138 unsigned long flags;
1139
1140 spin_lock_irqsave(&runtime->lock, flags);
1141 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1142 spin_unlock_irqrestore(&runtime->lock, flags);
1143 return result;
1144}
1145EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1146
1147/**
1148 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1149 * @substream: the rawmidi substream
1150 * @count: the transferred count
1151 *
1152 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1153 */
1154int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1155{
1156 struct snd_rawmidi_runtime *runtime = substream->runtime;
1157
1158 if (runtime->buffer == NULL) {
1159 rmidi_dbg(substream->rmidi,
1160 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1161 return -EINVAL;
1162 }
1163 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1164 runtime->hw_ptr += count;
1165 runtime->hw_ptr %= runtime->buffer_size;
1166 runtime->avail += count;
1167 substream->bytes += count;
1168 if (count > 0) {
1169 if (runtime->drain || snd_rawmidi_ready(substream))
1170 wake_up(&runtime->sleep);
1171 }
1172 return count;
1173}
1174EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1175
1176/**
1177 * snd_rawmidi_transmit_ack - acknowledge the transmission
1178 * @substream: the rawmidi substream
1179 * @count: the transferred count
1180 *
1181 * Advances the hardware pointer for the internal output buffer with
1182 * the given size and updates the condition.
1183 * Call after the transmission is finished.
1184 *
1185 * Return: The advanced size if successful, or a negative error code on failure.
1186 */
1187int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1188{
1189 struct snd_rawmidi_runtime *runtime = substream->runtime;
1190 int result;
1191 unsigned long flags;
1192
1193 spin_lock_irqsave(&runtime->lock, flags);
1194 result = __snd_rawmidi_transmit_ack(substream, count);
1195 spin_unlock_irqrestore(&runtime->lock, flags);
1196 return result;
1197}
1198EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1199
1200/**
1201 * snd_rawmidi_transmit - copy from the buffer to the device
1202 * @substream: the rawmidi substream
1203 * @buffer: the buffer pointer
1204 * @count: the data size to transfer
1205 *
1206 * Copies data from the buffer to the device and advances the pointer.
1207 *
1208 * Return: The copied size if successful, or a negative error code on failure.
1209 */
1210int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1211 unsigned char *buffer, int count)
1212{
1213 struct snd_rawmidi_runtime *runtime = substream->runtime;
1214 int result;
1215 unsigned long flags;
1216
1217 spin_lock_irqsave(&runtime->lock, flags);
1218 if (!substream->opened)
1219 result = -EBADFD;
1220 else {
1221 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1222 if (count <= 0)
1223 result = count;
1224 else
1225 result = __snd_rawmidi_transmit_ack(substream, count);
1226 }
1227 spin_unlock_irqrestore(&runtime->lock, flags);
1228 return result;
1229}
1230EXPORT_SYMBOL(snd_rawmidi_transmit);
1231
1232static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1233 const unsigned char __user *userbuf,
1234 const unsigned char *kernelbuf,
1235 long count)
1236{
1237 unsigned long flags;
1238 long count1, result;
1239 struct snd_rawmidi_runtime *runtime = substream->runtime;
1240 unsigned long appl_ptr;
1241
1242 if (!kernelbuf && !userbuf)
1243 return -EINVAL;
1244 if (snd_BUG_ON(!runtime->buffer))
1245 return -EINVAL;
1246
1247 result = 0;
1248 spin_lock_irqsave(&runtime->lock, flags);
1249 if (substream->append) {
1250 if ((long)runtime->avail < count) {
1251 spin_unlock_irqrestore(&runtime->lock, flags);
1252 return -EAGAIN;
1253 }
1254 }
1255 while (count > 0 && runtime->avail > 0) {
1256 count1 = runtime->buffer_size - runtime->appl_ptr;
1257 if (count1 > count)
1258 count1 = count;
1259 if (count1 > (long)runtime->avail)
1260 count1 = runtime->avail;
1261
1262 /* update runtime->appl_ptr before unlocking for userbuf */
1263 appl_ptr = runtime->appl_ptr;
1264 runtime->appl_ptr += count1;
1265 runtime->appl_ptr %= runtime->buffer_size;
1266 runtime->avail -= count1;
1267
1268 if (kernelbuf)
1269 memcpy(runtime->buffer + appl_ptr,
1270 kernelbuf + result, count1);
1271 else if (userbuf) {
1272 spin_unlock_irqrestore(&runtime->lock, flags);
1273 if (copy_from_user(runtime->buffer + appl_ptr,
1274 userbuf + result, count1)) {
1275 spin_lock_irqsave(&runtime->lock, flags);
1276 result = result > 0 ? result : -EFAULT;
1277 goto __end;
1278 }
1279 spin_lock_irqsave(&runtime->lock, flags);
1280 }
1281 result += count1;
1282 count -= count1;
1283 }
1284 __end:
1285 count1 = runtime->avail < runtime->buffer_size;
1286 spin_unlock_irqrestore(&runtime->lock, flags);
1287 if (count1)
1288 snd_rawmidi_output_trigger(substream, 1);
1289 return result;
1290}
1291
1292long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1293 const unsigned char *buf, long count)
1294{
1295 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1296}
1297EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1298
1299static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1300 size_t count, loff_t *offset)
1301{
1302 long result, timeout;
1303 int count1;
1304 struct snd_rawmidi_file *rfile;
1305 struct snd_rawmidi_runtime *runtime;
1306 struct snd_rawmidi_substream *substream;
1307
1308 rfile = file->private_data;
1309 substream = rfile->output;
1310 runtime = substream->runtime;
1311 /* we cannot put an atomic message to our buffer */
1312 if (substream->append && count > runtime->buffer_size)
1313 return -EIO;
1314 result = 0;
1315 while (count > 0) {
1316 spin_lock_irq(&runtime->lock);
1317 while (!snd_rawmidi_ready_append(substream, count)) {
1318 wait_queue_entry_t wait;
1319 if (file->f_flags & O_NONBLOCK) {
1320 spin_unlock_irq(&runtime->lock);
1321 return result > 0 ? result : -EAGAIN;
1322 }
1323 init_waitqueue_entry(&wait, current);
1324 add_wait_queue(&runtime->sleep, &wait);
1325 set_current_state(TASK_INTERRUPTIBLE);
1326 spin_unlock_irq(&runtime->lock);
1327 timeout = schedule_timeout(30 * HZ);
1328 remove_wait_queue(&runtime->sleep, &wait);
1329 if (rfile->rmidi->card->shutdown)
1330 return -ENODEV;
1331 if (signal_pending(current))
1332 return result > 0 ? result : -ERESTARTSYS;
1333 if (!runtime->avail && !timeout)
1334 return result > 0 ? result : -EIO;
1335 spin_lock_irq(&runtime->lock);
1336 }
1337 spin_unlock_irq(&runtime->lock);
1338 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1339 if (count1 < 0)
1340 return result > 0 ? result : count1;
1341 result += count1;
1342 buf += count1;
1343 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1344 break;
1345 count -= count1;
1346 }
1347 if (file->f_flags & O_DSYNC) {
1348 spin_lock_irq(&runtime->lock);
1349 while (runtime->avail != runtime->buffer_size) {
1350 wait_queue_entry_t wait;
1351 unsigned int last_avail = runtime->avail;
1352 init_waitqueue_entry(&wait, current);
1353 add_wait_queue(&runtime->sleep, &wait);
1354 set_current_state(TASK_INTERRUPTIBLE);
1355 spin_unlock_irq(&runtime->lock);
1356 timeout = schedule_timeout(30 * HZ);
1357 remove_wait_queue(&runtime->sleep, &wait);
1358 if (signal_pending(current))
1359 return result > 0 ? result : -ERESTARTSYS;
1360 if (runtime->avail == last_avail && !timeout)
1361 return result > 0 ? result : -EIO;
1362 spin_lock_irq(&runtime->lock);
1363 }
1364 spin_unlock_irq(&runtime->lock);
1365 }
1366 return result;
1367}
1368
1369static __poll_t snd_rawmidi_poll(struct file *file, poll_table * wait)
1370{
1371 struct snd_rawmidi_file *rfile;
1372 struct snd_rawmidi_runtime *runtime;
1373 __poll_t mask;
1374
1375 rfile = file->private_data;
1376 if (rfile->input != NULL) {
1377 runtime = rfile->input->runtime;
1378 snd_rawmidi_input_trigger(rfile->input, 1);
1379 poll_wait(file, &runtime->sleep, wait);
1380 }
1381 if (rfile->output != NULL) {
1382 runtime = rfile->output->runtime;
1383 poll_wait(file, &runtime->sleep, wait);
1384 }
1385 mask = 0;
1386 if (rfile->input != NULL) {
1387 if (snd_rawmidi_ready(rfile->input))
1388 mask |= EPOLLIN | EPOLLRDNORM;
1389 }
1390 if (rfile->output != NULL) {
1391 if (snd_rawmidi_ready(rfile->output))
1392 mask |= EPOLLOUT | EPOLLWRNORM;
1393 }
1394 return mask;
1395}
1396
1397/*
1398 */
1399#ifdef CONFIG_COMPAT
1400#include "rawmidi_compat.c"
1401#else
1402#define snd_rawmidi_ioctl_compat NULL
1403#endif
1404
1405/*
1406
1407 */
1408
1409static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1410 struct snd_info_buffer *buffer)
1411{
1412 struct snd_rawmidi *rmidi;
1413 struct snd_rawmidi_substream *substream;
1414 struct snd_rawmidi_runtime *runtime;
1415
1416 rmidi = entry->private_data;
1417 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1418 mutex_lock(&rmidi->open_mutex);
1419 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1420 list_for_each_entry(substream,
1421 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1422 list) {
1423 snd_iprintf(buffer,
1424 "Output %d\n"
1425 " Tx bytes : %lu\n",
1426 substream->number,
1427 (unsigned long) substream->bytes);
1428 if (substream->opened) {
1429 snd_iprintf(buffer,
1430 " Owner PID : %d\n",
1431 pid_vnr(substream->pid));
1432 runtime = substream->runtime;
1433 snd_iprintf(buffer,
1434 " Mode : %s\n"
1435 " Buffer size : %lu\n"
1436 " Avail : %lu\n",
1437 runtime->oss ? "OSS compatible" : "native",
1438 (unsigned long) runtime->buffer_size,
1439 (unsigned long) runtime->avail);
1440 }
1441 }
1442 }
1443 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1444 list_for_each_entry(substream,
1445 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1446 list) {
1447 snd_iprintf(buffer,
1448 "Input %d\n"
1449 " Rx bytes : %lu\n",
1450 substream->number,
1451 (unsigned long) substream->bytes);
1452 if (substream->opened) {
1453 snd_iprintf(buffer,
1454 " Owner PID : %d\n",
1455 pid_vnr(substream->pid));
1456 runtime = substream->runtime;
1457 snd_iprintf(buffer,
1458 " Buffer size : %lu\n"
1459 " Avail : %lu\n"
1460 " Overruns : %lu\n",
1461 (unsigned long) runtime->buffer_size,
1462 (unsigned long) runtime->avail,
1463 (unsigned long) runtime->xruns);
1464 }
1465 }
1466 }
1467 mutex_unlock(&rmidi->open_mutex);
1468}
1469
1470/*
1471 * Register functions
1472 */
1473
1474static const struct file_operations snd_rawmidi_f_ops =
1475{
1476 .owner = THIS_MODULE,
1477 .read = snd_rawmidi_read,
1478 .write = snd_rawmidi_write,
1479 .open = snd_rawmidi_open,
1480 .release = snd_rawmidi_release,
1481 .llseek = no_llseek,
1482 .poll = snd_rawmidi_poll,
1483 .unlocked_ioctl = snd_rawmidi_ioctl,
1484 .compat_ioctl = snd_rawmidi_ioctl_compat,
1485};
1486
1487static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1488 struct snd_rawmidi_str *stream,
1489 int direction,
1490 int count)
1491{
1492 struct snd_rawmidi_substream *substream;
1493 int idx;
1494
1495 for (idx = 0; idx < count; idx++) {
1496 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1497 if (!substream)
1498 return -ENOMEM;
1499 substream->stream = direction;
1500 substream->number = idx;
1501 substream->rmidi = rmidi;
1502 substream->pstr = stream;
1503 list_add_tail(&substream->list, &stream->substreams);
1504 stream->substream_count++;
1505 }
1506 return 0;
1507}
1508
1509static void release_rawmidi_device(struct device *dev)
1510{
1511 kfree(container_of(dev, struct snd_rawmidi, dev));
1512}
1513
1514/**
1515 * snd_rawmidi_new - create a rawmidi instance
1516 * @card: the card instance
1517 * @id: the id string
1518 * @device: the device index
1519 * @output_count: the number of output streams
1520 * @input_count: the number of input streams
1521 * @rrawmidi: the pointer to store the new rawmidi instance
1522 *
1523 * Creates a new rawmidi instance.
1524 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1525 *
1526 * Return: Zero if successful, or a negative error code on failure.
1527 */
1528int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1529 int output_count, int input_count,
1530 struct snd_rawmidi ** rrawmidi)
1531{
1532 struct snd_rawmidi *rmidi;
1533 int err;
1534 static struct snd_device_ops ops = {
1535 .dev_free = snd_rawmidi_dev_free,
1536 .dev_register = snd_rawmidi_dev_register,
1537 .dev_disconnect = snd_rawmidi_dev_disconnect,
1538 };
1539
1540 if (snd_BUG_ON(!card))
1541 return -ENXIO;
1542 if (rrawmidi)
1543 *rrawmidi = NULL;
1544 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1545 if (!rmidi)
1546 return -ENOMEM;
1547 rmidi->card = card;
1548 rmidi->device = device;
1549 mutex_init(&rmidi->open_mutex);
1550 init_waitqueue_head(&rmidi->open_wait);
1551 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1552 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1553
1554 if (id != NULL)
1555 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1556
1557 snd_device_initialize(&rmidi->dev, card);
1558 rmidi->dev.release = release_rawmidi_device;
1559 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1560
1561 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1562 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1563 SNDRV_RAWMIDI_STREAM_INPUT,
1564 input_count)) < 0) {
1565 snd_rawmidi_free(rmidi);
1566 return err;
1567 }
1568 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1569 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1570 SNDRV_RAWMIDI_STREAM_OUTPUT,
1571 output_count)) < 0) {
1572 snd_rawmidi_free(rmidi);
1573 return err;
1574 }
1575 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1576 snd_rawmidi_free(rmidi);
1577 return err;
1578 }
1579 if (rrawmidi)
1580 *rrawmidi = rmidi;
1581 return 0;
1582}
1583EXPORT_SYMBOL(snd_rawmidi_new);
1584
1585static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1586{
1587 struct snd_rawmidi_substream *substream;
1588
1589 while (!list_empty(&stream->substreams)) {
1590 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1591 list_del(&substream->list);
1592 kfree(substream);
1593 }
1594}
1595
1596static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1597{
1598 if (!rmidi)
1599 return 0;
1600
1601 snd_info_free_entry(rmidi->proc_entry);
1602 rmidi->proc_entry = NULL;
1603 mutex_lock(®ister_mutex);
1604 if (rmidi->ops && rmidi->ops->dev_unregister)
1605 rmidi->ops->dev_unregister(rmidi);
1606 mutex_unlock(®ister_mutex);
1607
1608 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1609 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1610 if (rmidi->private_free)
1611 rmidi->private_free(rmidi);
1612 put_device(&rmidi->dev);
1613 return 0;
1614}
1615
1616static int snd_rawmidi_dev_free(struct snd_device *device)
1617{
1618 struct snd_rawmidi *rmidi = device->device_data;
1619 return snd_rawmidi_free(rmidi);
1620}
1621
1622#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1623static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1624{
1625 struct snd_rawmidi *rmidi = device->private_data;
1626 rmidi->seq_dev = NULL;
1627}
1628#endif
1629
1630static int snd_rawmidi_dev_register(struct snd_device *device)
1631{
1632 int err;
1633 struct snd_info_entry *entry;
1634 char name[16];
1635 struct snd_rawmidi *rmidi = device->device_data;
1636
1637 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1638 return -ENOMEM;
1639 mutex_lock(®ister_mutex);
1640 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1641 mutex_unlock(®ister_mutex);
1642 return -EBUSY;
1643 }
1644 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1645 mutex_unlock(®ister_mutex);
1646 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1647 rmidi->card, rmidi->device,
1648 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1649 if (err < 0) {
1650 rmidi_err(rmidi, "unable to register\n");
1651 mutex_lock(®ister_mutex);
1652 list_del(&rmidi->list);
1653 mutex_unlock(®ister_mutex);
1654 return err;
1655 }
1656 if (rmidi->ops && rmidi->ops->dev_register &&
1657 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1658 snd_unregister_device(&rmidi->dev);
1659 mutex_lock(®ister_mutex);
1660 list_del(&rmidi->list);
1661 mutex_unlock(®ister_mutex);
1662 return err;
1663 }
1664#ifdef CONFIG_SND_OSSEMUL
1665 rmidi->ossreg = 0;
1666 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1667 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1668 rmidi->card, 0, &snd_rawmidi_f_ops,
1669 rmidi) < 0) {
1670 rmidi_err(rmidi,
1671 "unable to register OSS rawmidi device %i:%i\n",
1672 rmidi->card->number, 0);
1673 } else {
1674 rmidi->ossreg++;
1675#ifdef SNDRV_OSS_INFO_DEV_MIDI
1676 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1677#endif
1678 }
1679 }
1680 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1681 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1682 rmidi->card, 1, &snd_rawmidi_f_ops,
1683 rmidi) < 0) {
1684 rmidi_err(rmidi,
1685 "unable to register OSS rawmidi device %i:%i\n",
1686 rmidi->card->number, 1);
1687 } else {
1688 rmidi->ossreg++;
1689 }
1690 }
1691#endif /* CONFIG_SND_OSSEMUL */
1692 sprintf(name, "midi%d", rmidi->device);
1693 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1694 if (entry) {
1695 entry->private_data = rmidi;
1696 entry->c.text.read = snd_rawmidi_proc_info_read;
1697 if (snd_info_register(entry) < 0) {
1698 snd_info_free_entry(entry);
1699 entry = NULL;
1700 }
1701 }
1702 rmidi->proc_entry = entry;
1703#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1704 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1705 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1706 rmidi->seq_dev->private_data = rmidi;
1707 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1708 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1709 snd_device_register(rmidi->card, rmidi->seq_dev);
1710 }
1711 }
1712#endif
1713 return 0;
1714}
1715
1716static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1717{
1718 struct snd_rawmidi *rmidi = device->device_data;
1719 int dir;
1720
1721 mutex_lock(®ister_mutex);
1722 mutex_lock(&rmidi->open_mutex);
1723 wake_up(&rmidi->open_wait);
1724 list_del_init(&rmidi->list);
1725 for (dir = 0; dir < 2; dir++) {
1726 struct snd_rawmidi_substream *s;
1727 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1728 if (s->runtime)
1729 wake_up(&s->runtime->sleep);
1730 }
1731 }
1732
1733#ifdef CONFIG_SND_OSSEMUL
1734 if (rmidi->ossreg) {
1735 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1736 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1737#ifdef SNDRV_OSS_INFO_DEV_MIDI
1738 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1739#endif
1740 }
1741 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1742 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1743 rmidi->ossreg = 0;
1744 }
1745#endif /* CONFIG_SND_OSSEMUL */
1746 snd_unregister_device(&rmidi->dev);
1747 mutex_unlock(&rmidi->open_mutex);
1748 mutex_unlock(®ister_mutex);
1749 return 0;
1750}
1751
1752/**
1753 * snd_rawmidi_set_ops - set the rawmidi operators
1754 * @rmidi: the rawmidi instance
1755 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1756 * @ops: the operator table
1757 *
1758 * Sets the rawmidi operators for the given stream direction.
1759 */
1760void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1761 const struct snd_rawmidi_ops *ops)
1762{
1763 struct snd_rawmidi_substream *substream;
1764
1765 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1766 substream->ops = ops;
1767}
1768EXPORT_SYMBOL(snd_rawmidi_set_ops);
1769
1770/*
1771 * ENTRY functions
1772 */
1773
1774static int __init alsa_rawmidi_init(void)
1775{
1776
1777 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1778 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1779#ifdef CONFIG_SND_OSSEMUL
1780 { int i;
1781 /* check device map table */
1782 for (i = 0; i < SNDRV_CARDS; i++) {
1783 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1784 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1785 i, midi_map[i]);
1786 midi_map[i] = 0;
1787 }
1788 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1789 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1790 i, amidi_map[i]);
1791 amidi_map[i] = 1;
1792 }
1793 }
1794 }
1795#endif /* CONFIG_SND_OSSEMUL */
1796 return 0;
1797}
1798
1799static void __exit alsa_rawmidi_exit(void)
1800{
1801 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1802 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1803}
1804
1805module_init(alsa_rawmidi_init)
1806module_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 unsigned long flags;
109 bool ready;
110
111 spin_lock_irqsave(&substream->lock, flags);
112 ready = __snd_rawmidi_ready(substream->runtime);
113 spin_unlock_irqrestore(&substream->lock, flags);
114 return ready;
115}
116
117static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
118 size_t count)
119{
120 struct snd_rawmidi_runtime *runtime = substream->runtime;
121
122 return runtime->avail >= runtime->avail_min &&
123 (!substream->append || runtime->avail >= count);
124}
125
126static void snd_rawmidi_input_event_work(struct work_struct *work)
127{
128 struct snd_rawmidi_runtime *runtime =
129 container_of(work, struct snd_rawmidi_runtime, event_work);
130
131 if (runtime->event)
132 runtime->event(runtime->substream);
133}
134
135/* buffer refcount management: call with substream->lock held */
136static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
137{
138 runtime->buffer_ref++;
139}
140
141static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
142{
143 runtime->buffer_ref--;
144}
145
146static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
147{
148 int loop = HZ;
149
150 spin_lock_irq(&substream->lock);
151 while (substream->runtime->buffer_ref) {
152 spin_unlock_irq(&substream->lock);
153 if (!--loop) {
154 rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
155 return;
156 }
157 schedule_timeout_uninterruptible(1);
158 spin_lock_irq(&substream->lock);
159 }
160 spin_unlock_irq(&substream->lock);
161}
162
163static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
164{
165 struct snd_rawmidi_runtime *runtime;
166
167 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
168 if (!runtime)
169 return -ENOMEM;
170 runtime->substream = substream;
171 init_waitqueue_head(&runtime->sleep);
172 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
173 runtime->event = NULL;
174 runtime->buffer_size = PAGE_SIZE;
175 runtime->avail_min = 1;
176 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
177 runtime->avail = 0;
178 else
179 runtime->avail = runtime->buffer_size;
180 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
181 if (!runtime->buffer) {
182 kfree(runtime);
183 return -ENOMEM;
184 }
185 runtime->appl_ptr = runtime->hw_ptr = 0;
186 substream->runtime = runtime;
187 if (rawmidi_is_ump(substream->rmidi))
188 runtime->align = 3;
189 return 0;
190}
191
192/* get the current alignment (either 0 or 3) */
193static inline int get_align(struct snd_rawmidi_runtime *runtime)
194{
195 if (IS_ENABLED(CONFIG_SND_UMP))
196 return runtime->align;
197 else
198 return 0;
199}
200
201/* get the trimmed size with the current alignment */
202#define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))
203
204static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
205{
206 struct snd_rawmidi_runtime *runtime = substream->runtime;
207
208 kvfree(runtime->buffer);
209 kfree(runtime);
210 substream->runtime = NULL;
211 return 0;
212}
213
214static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
215{
216 if (!substream->opened)
217 return;
218 substream->ops->trigger(substream, up);
219}
220
221static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
222{
223 if (!substream->opened)
224 return;
225 substream->ops->trigger(substream, up);
226 if (!up)
227 cancel_work_sync(&substream->runtime->event_work);
228}
229
230static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
231 bool is_input)
232{
233 runtime->drain = 0;
234 runtime->appl_ptr = runtime->hw_ptr = 0;
235 runtime->avail = is_input ? 0 : runtime->buffer_size;
236}
237
238static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
239 bool is_input)
240{
241 unsigned long flags;
242
243 spin_lock_irqsave(&substream->lock, flags);
244 if (substream->opened && substream->runtime)
245 __reset_runtime_ptrs(substream->runtime, is_input);
246 spin_unlock_irqrestore(&substream->lock, flags);
247}
248
249int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
250{
251 snd_rawmidi_output_trigger(substream, 0);
252 reset_runtime_ptrs(substream, false);
253 return 0;
254}
255EXPORT_SYMBOL(snd_rawmidi_drop_output);
256
257int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
258{
259 int err = 0;
260 long timeout;
261 struct snd_rawmidi_runtime *runtime;
262
263 spin_lock_irq(&substream->lock);
264 runtime = substream->runtime;
265 if (!substream->opened || !runtime || !runtime->buffer) {
266 err = -EINVAL;
267 } else {
268 snd_rawmidi_buffer_ref(runtime);
269 runtime->drain = 1;
270 }
271 spin_unlock_irq(&substream->lock);
272 if (err < 0)
273 return err;
274
275 timeout = wait_event_interruptible_timeout(runtime->sleep,
276 (runtime->avail >= runtime->buffer_size),
277 10*HZ);
278
279 spin_lock_irq(&substream->lock);
280 if (signal_pending(current))
281 err = -ERESTARTSYS;
282 if (runtime->avail < runtime->buffer_size && !timeout) {
283 rmidi_warn(substream->rmidi,
284 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
285 (long)runtime->avail, (long)runtime->buffer_size);
286 err = -EIO;
287 }
288 runtime->drain = 0;
289 spin_unlock_irq(&substream->lock);
290
291 if (err != -ERESTARTSYS) {
292 /* we need wait a while to make sure that Tx FIFOs are empty */
293 if (substream->ops->drain)
294 substream->ops->drain(substream);
295 else
296 msleep(50);
297 snd_rawmidi_drop_output(substream);
298 }
299
300 spin_lock_irq(&substream->lock);
301 snd_rawmidi_buffer_unref(runtime);
302 spin_unlock_irq(&substream->lock);
303
304 return err;
305}
306EXPORT_SYMBOL(snd_rawmidi_drain_output);
307
308int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
309{
310 snd_rawmidi_input_trigger(substream, 0);
311 reset_runtime_ptrs(substream, true);
312 return 0;
313}
314EXPORT_SYMBOL(snd_rawmidi_drain_input);
315
316/* look for an available substream for the given stream direction;
317 * if a specific subdevice is given, try to assign it
318 */
319static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
320 int stream, int mode,
321 struct snd_rawmidi_substream **sub_ret)
322{
323 struct snd_rawmidi_substream *substream;
324 struct snd_rawmidi_str *s = &rmidi->streams[stream];
325 static const unsigned int info_flags[2] = {
326 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
327 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
328 };
329
330 if (!(rmidi->info_flags & info_flags[stream]))
331 return -ENXIO;
332 if (subdevice >= 0 && subdevice >= s->substream_count)
333 return -ENODEV;
334
335 list_for_each_entry(substream, &s->substreams, list) {
336 if (substream->opened) {
337 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
338 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
339 !substream->append)
340 continue;
341 }
342 if (subdevice < 0 || subdevice == substream->number) {
343 *sub_ret = substream;
344 return 0;
345 }
346 }
347 return -EAGAIN;
348}
349
350/* open and do ref-counting for the given substream */
351static int open_substream(struct snd_rawmidi *rmidi,
352 struct snd_rawmidi_substream *substream,
353 int mode)
354{
355 int err;
356
357 if (substream->use_count == 0) {
358 err = snd_rawmidi_runtime_create(substream);
359 if (err < 0)
360 return err;
361 err = substream->ops->open(substream);
362 if (err < 0) {
363 snd_rawmidi_runtime_free(substream);
364 return err;
365 }
366 spin_lock_irq(&substream->lock);
367 substream->opened = 1;
368 substream->active_sensing = 0;
369 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
370 substream->append = 1;
371 substream->pid = get_pid(task_pid(current));
372 rmidi->streams[substream->stream].substream_opened++;
373 spin_unlock_irq(&substream->lock);
374 }
375 substream->use_count++;
376 return 0;
377}
378
379static void close_substream(struct snd_rawmidi *rmidi,
380 struct snd_rawmidi_substream *substream,
381 int cleanup);
382
383static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
384 struct snd_rawmidi_file *rfile)
385{
386 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
387 int err;
388
389 rfile->input = rfile->output = NULL;
390 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
391 err = assign_substream(rmidi, subdevice,
392 SNDRV_RAWMIDI_STREAM_INPUT,
393 mode, &sinput);
394 if (err < 0)
395 return err;
396 }
397 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
398 err = assign_substream(rmidi, subdevice,
399 SNDRV_RAWMIDI_STREAM_OUTPUT,
400 mode, &soutput);
401 if (err < 0)
402 return err;
403 }
404
405 if (sinput) {
406 err = open_substream(rmidi, sinput, mode);
407 if (err < 0)
408 return err;
409 }
410 if (soutput) {
411 err = open_substream(rmidi, soutput, mode);
412 if (err < 0) {
413 if (sinput)
414 close_substream(rmidi, sinput, 0);
415 return err;
416 }
417 }
418
419 rfile->rmidi = rmidi;
420 rfile->input = sinput;
421 rfile->output = soutput;
422 return 0;
423}
424
425/* called from sound/core/seq/seq_midi.c */
426int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
427 int mode, struct snd_rawmidi_file *rfile)
428{
429 int err;
430
431 if (snd_BUG_ON(!rfile))
432 return -EINVAL;
433 if (!try_module_get(rmidi->card->module))
434 return -ENXIO;
435
436 mutex_lock(&rmidi->open_mutex);
437 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
438 mutex_unlock(&rmidi->open_mutex);
439 if (err < 0)
440 module_put(rmidi->card->module);
441 return err;
442}
443EXPORT_SYMBOL(snd_rawmidi_kernel_open);
444
445static int snd_rawmidi_open(struct inode *inode, struct file *file)
446{
447 int maj = imajor(inode);
448 struct snd_card *card;
449 int subdevice;
450 unsigned short fflags;
451 int err;
452 struct snd_rawmidi *rmidi;
453 struct snd_rawmidi_file *rawmidi_file = NULL;
454 wait_queue_entry_t wait;
455
456 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
457 return -EINVAL; /* invalid combination */
458
459 err = stream_open(inode, file);
460 if (err < 0)
461 return err;
462
463 if (maj == snd_major) {
464 rmidi = snd_lookup_minor_data(iminor(inode),
465 SNDRV_DEVICE_TYPE_RAWMIDI);
466#ifdef CONFIG_SND_OSSEMUL
467 } else if (maj == SOUND_MAJOR) {
468 rmidi = snd_lookup_oss_minor_data(iminor(inode),
469 SNDRV_OSS_DEVICE_TYPE_MIDI);
470#endif
471 } else
472 return -ENXIO;
473
474 if (rmidi == NULL)
475 return -ENODEV;
476
477 if (!try_module_get(rmidi->card->module)) {
478 snd_card_unref(rmidi->card);
479 return -ENXIO;
480 }
481
482 mutex_lock(&rmidi->open_mutex);
483 card = rmidi->card;
484 err = snd_card_file_add(card, file);
485 if (err < 0)
486 goto __error_card;
487 fflags = snd_rawmidi_file_flags(file);
488 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
489 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
490 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
491 if (rawmidi_file == NULL) {
492 err = -ENOMEM;
493 goto __error;
494 }
495 rawmidi_file->user_pversion = 0;
496 init_waitqueue_entry(&wait, current);
497 add_wait_queue(&rmidi->open_wait, &wait);
498 while (1) {
499 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
500 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
501 if (err >= 0)
502 break;
503 if (err == -EAGAIN) {
504 if (file->f_flags & O_NONBLOCK) {
505 err = -EBUSY;
506 break;
507 }
508 } else
509 break;
510 set_current_state(TASK_INTERRUPTIBLE);
511 mutex_unlock(&rmidi->open_mutex);
512 schedule();
513 mutex_lock(&rmidi->open_mutex);
514 if (rmidi->card->shutdown) {
515 err = -ENODEV;
516 break;
517 }
518 if (signal_pending(current)) {
519 err = -ERESTARTSYS;
520 break;
521 }
522 }
523 remove_wait_queue(&rmidi->open_wait, &wait);
524 if (err < 0) {
525 kfree(rawmidi_file);
526 goto __error;
527 }
528#ifdef CONFIG_SND_OSSEMUL
529 if (rawmidi_file->input && rawmidi_file->input->runtime)
530 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
531 if (rawmidi_file->output && rawmidi_file->output->runtime)
532 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
533#endif
534 file->private_data = rawmidi_file;
535 mutex_unlock(&rmidi->open_mutex);
536 snd_card_unref(rmidi->card);
537 return 0;
538
539 __error:
540 snd_card_file_remove(card, file);
541 __error_card:
542 mutex_unlock(&rmidi->open_mutex);
543 module_put(rmidi->card->module);
544 snd_card_unref(rmidi->card);
545 return err;
546}
547
548static void close_substream(struct snd_rawmidi *rmidi,
549 struct snd_rawmidi_substream *substream,
550 int cleanup)
551{
552 if (--substream->use_count)
553 return;
554
555 if (cleanup) {
556 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
557 snd_rawmidi_input_trigger(substream, 0);
558 else {
559 if (substream->active_sensing) {
560 unsigned char buf = 0xfe;
561 /* sending single active sensing message
562 * to shut the device up
563 */
564 snd_rawmidi_kernel_write(substream, &buf, 1);
565 }
566 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
567 snd_rawmidi_output_trigger(substream, 0);
568 }
569 snd_rawmidi_buffer_ref_sync(substream);
570 }
571 spin_lock_irq(&substream->lock);
572 substream->opened = 0;
573 substream->append = 0;
574 spin_unlock_irq(&substream->lock);
575 substream->ops->close(substream);
576 if (substream->runtime->private_free)
577 substream->runtime->private_free(substream);
578 snd_rawmidi_runtime_free(substream);
579 put_pid(substream->pid);
580 substream->pid = NULL;
581 rmidi->streams[substream->stream].substream_opened--;
582}
583
584static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
585{
586 struct snd_rawmidi *rmidi;
587
588 rmidi = rfile->rmidi;
589 mutex_lock(&rmidi->open_mutex);
590 if (rfile->input) {
591 close_substream(rmidi, rfile->input, 1);
592 rfile->input = NULL;
593 }
594 if (rfile->output) {
595 close_substream(rmidi, rfile->output, 1);
596 rfile->output = NULL;
597 }
598 rfile->rmidi = NULL;
599 mutex_unlock(&rmidi->open_mutex);
600 wake_up(&rmidi->open_wait);
601}
602
603/* called from sound/core/seq/seq_midi.c */
604int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
605{
606 struct snd_rawmidi *rmidi;
607
608 if (snd_BUG_ON(!rfile))
609 return -ENXIO;
610
611 rmidi = rfile->rmidi;
612 rawmidi_release_priv(rfile);
613 module_put(rmidi->card->module);
614 return 0;
615}
616EXPORT_SYMBOL(snd_rawmidi_kernel_release);
617
618static int snd_rawmidi_release(struct inode *inode, struct file *file)
619{
620 struct snd_rawmidi_file *rfile;
621 struct snd_rawmidi *rmidi;
622 struct module *module;
623
624 rfile = file->private_data;
625 rmidi = rfile->rmidi;
626 rawmidi_release_priv(rfile);
627 kfree(rfile);
628 module = rmidi->card->module;
629 snd_card_file_remove(rmidi->card, file);
630 module_put(module);
631 return 0;
632}
633
634static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
635 struct snd_rawmidi_info *info)
636{
637 struct snd_rawmidi *rmidi;
638
639 if (substream == NULL)
640 return -ENODEV;
641 rmidi = substream->rmidi;
642 memset(info, 0, sizeof(*info));
643 info->card = rmidi->card->number;
644 info->device = rmidi->device;
645 info->subdevice = substream->number;
646 info->stream = substream->stream;
647 info->flags = rmidi->info_flags;
648 strcpy(info->id, rmidi->id);
649 strcpy(info->name, rmidi->name);
650 strcpy(info->subname, substream->name);
651 info->subdevices_count = substream->pstr->substream_count;
652 info->subdevices_avail = (substream->pstr->substream_count -
653 substream->pstr->substream_opened);
654 return 0;
655}
656
657static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
658 struct snd_rawmidi_info __user *_info)
659{
660 struct snd_rawmidi_info info;
661 int err;
662
663 err = snd_rawmidi_info(substream, &info);
664 if (err < 0)
665 return err;
666 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
667 return -EFAULT;
668 return 0;
669}
670
671static int __snd_rawmidi_info_select(struct snd_card *card,
672 struct snd_rawmidi_info *info)
673{
674 struct snd_rawmidi *rmidi;
675 struct snd_rawmidi_str *pstr;
676 struct snd_rawmidi_substream *substream;
677
678 rmidi = snd_rawmidi_search(card, info->device);
679 if (!rmidi)
680 return -ENXIO;
681 if (info->stream < 0 || info->stream > 1)
682 return -EINVAL;
683 info->stream = array_index_nospec(info->stream, 2);
684 pstr = &rmidi->streams[info->stream];
685 if (pstr->substream_count == 0)
686 return -ENOENT;
687 if (info->subdevice >= pstr->substream_count)
688 return -ENXIO;
689 list_for_each_entry(substream, &pstr->substreams, list) {
690 if ((unsigned int)substream->number == info->subdevice)
691 return snd_rawmidi_info(substream, info);
692 }
693 return -ENXIO;
694}
695
696int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
697{
698 int ret;
699
700 mutex_lock(®ister_mutex);
701 ret = __snd_rawmidi_info_select(card, info);
702 mutex_unlock(®ister_mutex);
703 return ret;
704}
705EXPORT_SYMBOL(snd_rawmidi_info_select);
706
707static int snd_rawmidi_info_select_user(struct snd_card *card,
708 struct snd_rawmidi_info __user *_info)
709{
710 int err;
711 struct snd_rawmidi_info info;
712
713 if (get_user(info.device, &_info->device))
714 return -EFAULT;
715 if (get_user(info.stream, &_info->stream))
716 return -EFAULT;
717 if (get_user(info.subdevice, &_info->subdevice))
718 return -EFAULT;
719 err = snd_rawmidi_info_select(card, &info);
720 if (err < 0)
721 return err;
722 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
723 return -EFAULT;
724 return 0;
725}
726
727static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
728 struct snd_rawmidi_params *params,
729 bool is_input)
730{
731 struct snd_rawmidi_runtime *runtime = substream->runtime;
732 char *newbuf, *oldbuf;
733 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
734
735 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
736 return -EINVAL;
737 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
738 return -EINVAL;
739 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
740 return -EINVAL;
741 if (params->buffer_size & get_align(runtime))
742 return -EINVAL;
743 if (params->buffer_size != runtime->buffer_size) {
744 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
745 if (!newbuf)
746 return -ENOMEM;
747 spin_lock_irq(&substream->lock);
748 if (runtime->buffer_ref) {
749 spin_unlock_irq(&substream->lock);
750 kvfree(newbuf);
751 return -EBUSY;
752 }
753 oldbuf = runtime->buffer;
754 runtime->buffer = newbuf;
755 runtime->buffer_size = params->buffer_size;
756 __reset_runtime_ptrs(runtime, is_input);
757 spin_unlock_irq(&substream->lock);
758 kvfree(oldbuf);
759 }
760 runtime->avail_min = params->avail_min;
761 return 0;
762}
763
764int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
765 struct snd_rawmidi_params *params)
766{
767 int err;
768
769 snd_rawmidi_drain_output(substream);
770 mutex_lock(&substream->rmidi->open_mutex);
771 if (substream->append && substream->use_count > 1)
772 err = -EBUSY;
773 else
774 err = resize_runtime_buffer(substream, params, false);
775
776 if (!err)
777 substream->active_sensing = !params->no_active_sensing;
778 mutex_unlock(&substream->rmidi->open_mutex);
779 return err;
780}
781EXPORT_SYMBOL(snd_rawmidi_output_params);
782
783int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
784 struct snd_rawmidi_params *params)
785{
786 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
787 unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
788 int err;
789
790 snd_rawmidi_drain_input(substream);
791 mutex_lock(&substream->rmidi->open_mutex);
792 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
793 err = -EINVAL;
794 else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
795 err = -EINVAL;
796 else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
797 err = -EINVAL;
798 else
799 err = resize_runtime_buffer(substream, params, true);
800
801 if (!err) {
802 substream->framing = framing;
803 substream->clock_type = clock_type;
804 }
805 mutex_unlock(&substream->rmidi->open_mutex);
806 return 0;
807}
808EXPORT_SYMBOL(snd_rawmidi_input_params);
809
810static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
811 struct snd_rawmidi_status64 *status)
812{
813 struct snd_rawmidi_runtime *runtime = substream->runtime;
814
815 memset(status, 0, sizeof(*status));
816 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
817 spin_lock_irq(&substream->lock);
818 status->avail = runtime->avail;
819 spin_unlock_irq(&substream->lock);
820 return 0;
821}
822
823static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
824 struct snd_rawmidi_status64 *status)
825{
826 struct snd_rawmidi_runtime *runtime = substream->runtime;
827
828 memset(status, 0, sizeof(*status));
829 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
830 spin_lock_irq(&substream->lock);
831 status->avail = runtime->avail;
832 status->xruns = runtime->xruns;
833 runtime->xruns = 0;
834 spin_unlock_irq(&substream->lock);
835 return 0;
836}
837
838static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
839 struct snd_rawmidi_status32 __user *argp)
840{
841 int err = 0;
842 struct snd_rawmidi_status32 __user *status = argp;
843 struct snd_rawmidi_status32 status32;
844 struct snd_rawmidi_status64 status64;
845
846 if (copy_from_user(&status32, argp,
847 sizeof(struct snd_rawmidi_status32)))
848 return -EFAULT;
849
850 switch (status32.stream) {
851 case SNDRV_RAWMIDI_STREAM_OUTPUT:
852 if (rfile->output == NULL)
853 return -EINVAL;
854 err = snd_rawmidi_output_status(rfile->output, &status64);
855 break;
856 case SNDRV_RAWMIDI_STREAM_INPUT:
857 if (rfile->input == NULL)
858 return -EINVAL;
859 err = snd_rawmidi_input_status(rfile->input, &status64);
860 break;
861 default:
862 return -EINVAL;
863 }
864 if (err < 0)
865 return err;
866
867 status32 = (struct snd_rawmidi_status32) {
868 .stream = status64.stream,
869 .tstamp_sec = status64.tstamp_sec,
870 .tstamp_nsec = status64.tstamp_nsec,
871 .avail = status64.avail,
872 .xruns = status64.xruns,
873 };
874
875 if (copy_to_user(status, &status32, sizeof(*status)))
876 return -EFAULT;
877
878 return 0;
879}
880
881static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
882 struct snd_rawmidi_status64 __user *argp)
883{
884 int err = 0;
885 struct snd_rawmidi_status64 status;
886
887 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
888 return -EFAULT;
889
890 switch (status.stream) {
891 case SNDRV_RAWMIDI_STREAM_OUTPUT:
892 if (rfile->output == NULL)
893 return -EINVAL;
894 err = snd_rawmidi_output_status(rfile->output, &status);
895 break;
896 case SNDRV_RAWMIDI_STREAM_INPUT:
897 if (rfile->input == NULL)
898 return -EINVAL;
899 err = snd_rawmidi_input_status(rfile->input, &status);
900 break;
901 default:
902 return -EINVAL;
903 }
904 if (err < 0)
905 return err;
906 if (copy_to_user(argp, &status,
907 sizeof(struct snd_rawmidi_status64)))
908 return -EFAULT;
909 return 0;
910}
911
912static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
913{
914 struct snd_rawmidi_file *rfile;
915 struct snd_rawmidi *rmidi;
916 void __user *argp = (void __user *)arg;
917
918 rfile = file->private_data;
919 if (((cmd >> 8) & 0xff) != 'W')
920 return -ENOTTY;
921 switch (cmd) {
922 case SNDRV_RAWMIDI_IOCTL_PVERSION:
923 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
924 case SNDRV_RAWMIDI_IOCTL_INFO:
925 {
926 int stream;
927 struct snd_rawmidi_info __user *info = argp;
928
929 if (get_user(stream, &info->stream))
930 return -EFAULT;
931 switch (stream) {
932 case SNDRV_RAWMIDI_STREAM_INPUT:
933 return snd_rawmidi_info_user(rfile->input, info);
934 case SNDRV_RAWMIDI_STREAM_OUTPUT:
935 return snd_rawmidi_info_user(rfile->output, info);
936 default:
937 return -EINVAL;
938 }
939 }
940 case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
941 if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
942 return -EFAULT;
943 return 0;
944
945 case SNDRV_RAWMIDI_IOCTL_PARAMS:
946 {
947 struct snd_rawmidi_params params;
948
949 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
950 return -EFAULT;
951 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
952 params.mode = 0;
953 memset(params.reserved, 0, sizeof(params.reserved));
954 }
955 switch (params.stream) {
956 case SNDRV_RAWMIDI_STREAM_OUTPUT:
957 if (rfile->output == NULL)
958 return -EINVAL;
959 return snd_rawmidi_output_params(rfile->output, ¶ms);
960 case SNDRV_RAWMIDI_STREAM_INPUT:
961 if (rfile->input == NULL)
962 return -EINVAL;
963 return snd_rawmidi_input_params(rfile->input, ¶ms);
964 default:
965 return -EINVAL;
966 }
967 }
968 case SNDRV_RAWMIDI_IOCTL_STATUS32:
969 return snd_rawmidi_ioctl_status32(rfile, argp);
970 case SNDRV_RAWMIDI_IOCTL_STATUS64:
971 return snd_rawmidi_ioctl_status64(rfile, argp);
972 case SNDRV_RAWMIDI_IOCTL_DROP:
973 {
974 int val;
975
976 if (get_user(val, (int __user *) argp))
977 return -EFAULT;
978 switch (val) {
979 case SNDRV_RAWMIDI_STREAM_OUTPUT:
980 if (rfile->output == NULL)
981 return -EINVAL;
982 return snd_rawmidi_drop_output(rfile->output);
983 default:
984 return -EINVAL;
985 }
986 }
987 case SNDRV_RAWMIDI_IOCTL_DRAIN:
988 {
989 int val;
990
991 if (get_user(val, (int __user *) argp))
992 return -EFAULT;
993 switch (val) {
994 case SNDRV_RAWMIDI_STREAM_OUTPUT:
995 if (rfile->output == NULL)
996 return -EINVAL;
997 return snd_rawmidi_drain_output(rfile->output);
998 case SNDRV_RAWMIDI_STREAM_INPUT:
999 if (rfile->input == NULL)
1000 return -EINVAL;
1001 return snd_rawmidi_drain_input(rfile->input);
1002 default:
1003 return -EINVAL;
1004 }
1005 }
1006 default:
1007 rmidi = rfile->rmidi;
1008 if (rmidi->ops && rmidi->ops->ioctl)
1009 return rmidi->ops->ioctl(rmidi, cmd, argp);
1010 rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
1011 }
1012 return -ENOTTY;
1013}
1014
1015/* ioctl to find the next device; either legacy or UMP depending on @find_ump */
1016static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
1017 bool find_ump)
1018
1019{
1020 struct snd_rawmidi *rmidi;
1021 int device;
1022 bool is_ump;
1023
1024 if (get_user(device, argp))
1025 return -EFAULT;
1026 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1027 device = SNDRV_RAWMIDI_DEVICES - 1;
1028 mutex_lock(®ister_mutex);
1029 device = device < 0 ? 0 : device + 1;
1030 for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
1031 rmidi = snd_rawmidi_search(card, device);
1032 if (!rmidi)
1033 continue;
1034 is_ump = rawmidi_is_ump(rmidi);
1035 if (find_ump == is_ump)
1036 break;
1037 }
1038 if (device == SNDRV_RAWMIDI_DEVICES)
1039 device = -1;
1040 mutex_unlock(®ister_mutex);
1041 if (put_user(device, argp))
1042 return -EFAULT;
1043 return 0;
1044}
1045
1046#if IS_ENABLED(CONFIG_SND_UMP)
1047/* inquiry of UMP endpoint and block info via control API */
1048static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
1049 void __user *argp)
1050{
1051 struct snd_ump_endpoint_info __user *info = argp;
1052 struct snd_rawmidi *rmidi;
1053 int device, ret;
1054
1055 if (get_user(device, &info->device))
1056 return -EFAULT;
1057 mutex_lock(®ister_mutex);
1058 rmidi = snd_rawmidi_search(card, device);
1059 if (rmidi && rmidi->ops && rmidi->ops->ioctl)
1060 ret = rmidi->ops->ioctl(rmidi, cmd, argp);
1061 else
1062 ret = -ENXIO;
1063 mutex_unlock(®ister_mutex);
1064 return ret;
1065}
1066#endif
1067
1068static int snd_rawmidi_control_ioctl(struct snd_card *card,
1069 struct snd_ctl_file *control,
1070 unsigned int cmd,
1071 unsigned long arg)
1072{
1073 void __user *argp = (void __user *)arg;
1074
1075 switch (cmd) {
1076 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1077 return snd_rawmidi_next_device(card, argp, false);
1078#if IS_ENABLED(CONFIG_SND_UMP)
1079 case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
1080 return snd_rawmidi_next_device(card, argp, true);
1081 case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
1082 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
1083 case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
1084 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
1085#endif
1086 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1087 {
1088 int val;
1089
1090 if (get_user(val, (int __user *)argp))
1091 return -EFAULT;
1092 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1093 return 0;
1094 }
1095 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1096 return snd_rawmidi_info_select_user(card, argp);
1097 }
1098 return -ENOIOCTLCMD;
1099}
1100
1101static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1102 const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1103{
1104 struct snd_rawmidi_runtime *runtime = substream->runtime;
1105 struct snd_rawmidi_framing_tstamp *dest_ptr;
1106 struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1107 int orig_count = src_count;
1108 int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1109 int align = get_align(runtime);
1110
1111 BUILD_BUG_ON(frame_size != 0x20);
1112 if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1113 return -EINVAL;
1114
1115 while (src_count > align) {
1116 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1117 runtime->xruns += src_count;
1118 break;
1119 }
1120 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1121 frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1122 else {
1123 frame.length = get_aligned_size(runtime, src_count);
1124 if (!frame.length)
1125 break;
1126 memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1127 }
1128 memcpy(frame.data, buffer, frame.length);
1129 buffer += frame.length;
1130 src_count -= frame.length;
1131 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1132 *dest_ptr = frame;
1133 runtime->avail += frame_size;
1134 runtime->hw_ptr += frame_size;
1135 runtime->hw_ptr %= runtime->buffer_size;
1136 }
1137 return orig_count - src_count;
1138}
1139
1140static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1141{
1142 struct timespec64 ts64 = {0, 0};
1143
1144 switch (substream->clock_type) {
1145 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1146 ktime_get_raw_ts64(&ts64);
1147 break;
1148 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1149 ktime_get_ts64(&ts64);
1150 break;
1151 case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1152 ktime_get_real_ts64(&ts64);
1153 break;
1154 }
1155 return ts64;
1156}
1157
1158/**
1159 * snd_rawmidi_receive - receive the input data from the device
1160 * @substream: the rawmidi substream
1161 * @buffer: the buffer pointer
1162 * @count: the data size to read
1163 *
1164 * Reads the data from the internal buffer.
1165 *
1166 * Return: The size of read data, or a negative error code on failure.
1167 */
1168int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1169 const unsigned char *buffer, int count)
1170{
1171 unsigned long flags;
1172 struct timespec64 ts64 = get_framing_tstamp(substream);
1173 int result = 0, count1;
1174 struct snd_rawmidi_runtime *runtime;
1175
1176 spin_lock_irqsave(&substream->lock, flags);
1177 if (!substream->opened) {
1178 result = -EBADFD;
1179 goto unlock;
1180 }
1181 runtime = substream->runtime;
1182 if (!runtime || !runtime->buffer) {
1183 rmidi_dbg(substream->rmidi,
1184 "snd_rawmidi_receive: input is not active!!!\n");
1185 result = -EINVAL;
1186 goto unlock;
1187 }
1188
1189 count = get_aligned_size(runtime, count);
1190 if (!count)
1191 goto unlock;
1192
1193 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1194 result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1195 } else if (count == 1) { /* special case, faster code */
1196 substream->bytes++;
1197 if (runtime->avail < runtime->buffer_size) {
1198 runtime->buffer[runtime->hw_ptr++] = buffer[0];
1199 runtime->hw_ptr %= runtime->buffer_size;
1200 runtime->avail++;
1201 result++;
1202 } else {
1203 runtime->xruns++;
1204 }
1205 } else {
1206 substream->bytes += count;
1207 count1 = runtime->buffer_size - runtime->hw_ptr;
1208 if (count1 > count)
1209 count1 = count;
1210 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1211 count1 = runtime->buffer_size - runtime->avail;
1212 count1 = get_aligned_size(runtime, count1);
1213 if (!count1)
1214 goto unlock;
1215 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1216 runtime->hw_ptr += count1;
1217 runtime->hw_ptr %= runtime->buffer_size;
1218 runtime->avail += count1;
1219 count -= count1;
1220 result += count1;
1221 if (count > 0) {
1222 buffer += count1;
1223 count1 = count;
1224 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1225 count1 = runtime->buffer_size - runtime->avail;
1226 runtime->xruns += count - count1;
1227 }
1228 if (count1 > 0) {
1229 memcpy(runtime->buffer, buffer, count1);
1230 runtime->hw_ptr = count1;
1231 runtime->avail += count1;
1232 result += count1;
1233 }
1234 }
1235 }
1236 if (result > 0) {
1237 if (runtime->event)
1238 schedule_work(&runtime->event_work);
1239 else if (__snd_rawmidi_ready(runtime))
1240 wake_up(&runtime->sleep);
1241 }
1242 unlock:
1243 spin_unlock_irqrestore(&substream->lock, flags);
1244 return result;
1245}
1246EXPORT_SYMBOL(snd_rawmidi_receive);
1247
1248static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1249 unsigned char __user *userbuf,
1250 unsigned char *kernelbuf, long count)
1251{
1252 unsigned long flags;
1253 long result = 0, count1;
1254 struct snd_rawmidi_runtime *runtime = substream->runtime;
1255 unsigned long appl_ptr;
1256 int err = 0;
1257
1258 spin_lock_irqsave(&substream->lock, flags);
1259 snd_rawmidi_buffer_ref(runtime);
1260 while (count > 0 && runtime->avail) {
1261 count1 = runtime->buffer_size - runtime->appl_ptr;
1262 if (count1 > count)
1263 count1 = count;
1264 if (count1 > (int)runtime->avail)
1265 count1 = runtime->avail;
1266
1267 /* update runtime->appl_ptr before unlocking for userbuf */
1268 appl_ptr = runtime->appl_ptr;
1269 runtime->appl_ptr += count1;
1270 runtime->appl_ptr %= runtime->buffer_size;
1271 runtime->avail -= count1;
1272
1273 if (kernelbuf)
1274 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1275 if (userbuf) {
1276 spin_unlock_irqrestore(&substream->lock, flags);
1277 if (copy_to_user(userbuf + result,
1278 runtime->buffer + appl_ptr, count1))
1279 err = -EFAULT;
1280 spin_lock_irqsave(&substream->lock, flags);
1281 if (err)
1282 goto out;
1283 }
1284 result += count1;
1285 count -= count1;
1286 }
1287 out:
1288 snd_rawmidi_buffer_unref(runtime);
1289 spin_unlock_irqrestore(&substream->lock, flags);
1290 return result > 0 ? result : err;
1291}
1292
1293long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1294 unsigned char *buf, long count)
1295{
1296 snd_rawmidi_input_trigger(substream, 1);
1297 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1298}
1299EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1300
1301static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1302 loff_t *offset)
1303{
1304 long result;
1305 int count1;
1306 struct snd_rawmidi_file *rfile;
1307 struct snd_rawmidi_substream *substream;
1308 struct snd_rawmidi_runtime *runtime;
1309
1310 rfile = file->private_data;
1311 substream = rfile->input;
1312 if (substream == NULL)
1313 return -EIO;
1314 runtime = substream->runtime;
1315 snd_rawmidi_input_trigger(substream, 1);
1316 result = 0;
1317 while (count > 0) {
1318 spin_lock_irq(&substream->lock);
1319 while (!__snd_rawmidi_ready(runtime)) {
1320 wait_queue_entry_t wait;
1321
1322 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1323 spin_unlock_irq(&substream->lock);
1324 return result > 0 ? result : -EAGAIN;
1325 }
1326 init_waitqueue_entry(&wait, current);
1327 add_wait_queue(&runtime->sleep, &wait);
1328 set_current_state(TASK_INTERRUPTIBLE);
1329 spin_unlock_irq(&substream->lock);
1330 schedule();
1331 remove_wait_queue(&runtime->sleep, &wait);
1332 if (rfile->rmidi->card->shutdown)
1333 return -ENODEV;
1334 if (signal_pending(current))
1335 return result > 0 ? result : -ERESTARTSYS;
1336 spin_lock_irq(&substream->lock);
1337 if (!runtime->avail) {
1338 spin_unlock_irq(&substream->lock);
1339 return result > 0 ? result : -EIO;
1340 }
1341 }
1342 spin_unlock_irq(&substream->lock);
1343 count1 = snd_rawmidi_kernel_read1(substream,
1344 (unsigned char __user *)buf,
1345 NULL/*kernelbuf*/,
1346 count);
1347 if (count1 < 0)
1348 return result > 0 ? result : count1;
1349 result += count1;
1350 buf += count1;
1351 count -= count1;
1352 }
1353 return result;
1354}
1355
1356/**
1357 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1358 * @substream: the rawmidi substream
1359 *
1360 * Return: 1 if the internal output buffer is empty, 0 if not.
1361 */
1362int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1363{
1364 struct snd_rawmidi_runtime *runtime;
1365 int result;
1366 unsigned long flags;
1367
1368 spin_lock_irqsave(&substream->lock, flags);
1369 runtime = substream->runtime;
1370 if (!substream->opened || !runtime || !runtime->buffer) {
1371 rmidi_dbg(substream->rmidi,
1372 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1373 result = 1;
1374 } else {
1375 result = runtime->avail >= runtime->buffer_size;
1376 }
1377 spin_unlock_irqrestore(&substream->lock, flags);
1378 return result;
1379}
1380EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1381
1382/*
1383 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1384 * @substream: the rawmidi substream
1385 * @buffer: the buffer pointer
1386 * @count: data size to transfer
1387 *
1388 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1389 */
1390static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1391 unsigned char *buffer, int count)
1392{
1393 int result, count1;
1394 struct snd_rawmidi_runtime *runtime = substream->runtime;
1395
1396 if (runtime->buffer == NULL) {
1397 rmidi_dbg(substream->rmidi,
1398 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1399 return -EINVAL;
1400 }
1401 result = 0;
1402 if (runtime->avail >= runtime->buffer_size) {
1403 /* warning: lowlevel layer MUST trigger down the hardware */
1404 goto __skip;
1405 }
1406 if (count == 1) { /* special case, faster code */
1407 *buffer = runtime->buffer[runtime->hw_ptr];
1408 result++;
1409 } else {
1410 count1 = runtime->buffer_size - runtime->hw_ptr;
1411 if (count1 > count)
1412 count1 = count;
1413 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1414 count1 = runtime->buffer_size - runtime->avail;
1415 count1 = get_aligned_size(runtime, count1);
1416 if (!count1)
1417 goto __skip;
1418 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1419 count -= count1;
1420 result += count1;
1421 if (count > 0) {
1422 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1423 count = runtime->buffer_size - runtime->avail - count1;
1424 count = get_aligned_size(runtime, count);
1425 if (!count)
1426 goto __skip;
1427 memcpy(buffer + count1, runtime->buffer, count);
1428 result += count;
1429 }
1430 }
1431 __skip:
1432 return result;
1433}
1434
1435/**
1436 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1437 * @substream: the rawmidi substream
1438 * @buffer: the buffer pointer
1439 * @count: data size to transfer
1440 *
1441 * Copies data from the internal output buffer to the given buffer.
1442 *
1443 * Call this in the interrupt handler when the midi output is ready,
1444 * and call snd_rawmidi_transmit_ack() after the transmission is
1445 * finished.
1446 *
1447 * Return: The size of copied data, or a negative error code on failure.
1448 */
1449int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1450 unsigned char *buffer, int count)
1451{
1452 int result;
1453 unsigned long flags;
1454
1455 spin_lock_irqsave(&substream->lock, flags);
1456 if (!substream->opened || !substream->runtime)
1457 result = -EBADFD;
1458 else
1459 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1460 spin_unlock_irqrestore(&substream->lock, flags);
1461 return result;
1462}
1463EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1464
1465/*
1466 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1467 * @substream: the rawmidi substream
1468 * @count: the transferred count
1469 *
1470 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1471 */
1472static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1473 int count)
1474{
1475 struct snd_rawmidi_runtime *runtime = substream->runtime;
1476
1477 if (runtime->buffer == NULL) {
1478 rmidi_dbg(substream->rmidi,
1479 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1480 return -EINVAL;
1481 }
1482 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1483 count = get_aligned_size(runtime, count);
1484 runtime->hw_ptr += count;
1485 runtime->hw_ptr %= runtime->buffer_size;
1486 runtime->avail += count;
1487 substream->bytes += count;
1488 if (count > 0) {
1489 if (runtime->drain || __snd_rawmidi_ready(runtime))
1490 wake_up(&runtime->sleep);
1491 }
1492 return count;
1493}
1494
1495/**
1496 * snd_rawmidi_transmit_ack - acknowledge the transmission
1497 * @substream: the rawmidi substream
1498 * @count: the transferred count
1499 *
1500 * Advances the hardware pointer for the internal output buffer with
1501 * the given size and updates the condition.
1502 * Call after the transmission is finished.
1503 *
1504 * Return: The advanced size if successful, or a negative error code on failure.
1505 */
1506int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1507{
1508 int result;
1509 unsigned long flags;
1510
1511 spin_lock_irqsave(&substream->lock, flags);
1512 if (!substream->opened || !substream->runtime)
1513 result = -EBADFD;
1514 else
1515 result = __snd_rawmidi_transmit_ack(substream, count);
1516 spin_unlock_irqrestore(&substream->lock, flags);
1517 return result;
1518}
1519EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1520
1521/**
1522 * snd_rawmidi_transmit - copy from the buffer to the device
1523 * @substream: the rawmidi substream
1524 * @buffer: the buffer pointer
1525 * @count: the data size to transfer
1526 *
1527 * Copies data from the buffer to the device and advances the pointer.
1528 *
1529 * Return: The copied size if successful, or a negative error code on failure.
1530 */
1531int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1532 unsigned char *buffer, int count)
1533{
1534 int result;
1535 unsigned long flags;
1536
1537 spin_lock_irqsave(&substream->lock, flags);
1538 if (!substream->opened)
1539 result = -EBADFD;
1540 else {
1541 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1542 if (count <= 0)
1543 result = count;
1544 else
1545 result = __snd_rawmidi_transmit_ack(substream, count);
1546 }
1547 spin_unlock_irqrestore(&substream->lock, flags);
1548 return result;
1549}
1550EXPORT_SYMBOL(snd_rawmidi_transmit);
1551
1552/**
1553 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1554 * @substream: rawmidi substream
1555 *
1556 * Return: the number of discarded bytes
1557 */
1558int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1559{
1560 struct snd_rawmidi_runtime *runtime;
1561 unsigned long flags;
1562 int count = 0;
1563
1564 spin_lock_irqsave(&substream->lock, flags);
1565 runtime = substream->runtime;
1566 if (substream->opened && runtime &&
1567 runtime->avail < runtime->buffer_size) {
1568 count = runtime->buffer_size - runtime->avail;
1569 __snd_rawmidi_transmit_ack(substream, count);
1570 }
1571 spin_unlock_irqrestore(&substream->lock, flags);
1572 return count;
1573}
1574EXPORT_SYMBOL(snd_rawmidi_proceed);
1575
1576static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1577 const unsigned char __user *userbuf,
1578 const unsigned char *kernelbuf,
1579 long count)
1580{
1581 unsigned long flags;
1582 long count1, result;
1583 struct snd_rawmidi_runtime *runtime = substream->runtime;
1584 unsigned long appl_ptr;
1585
1586 if (!kernelbuf && !userbuf)
1587 return -EINVAL;
1588 if (snd_BUG_ON(!runtime->buffer))
1589 return -EINVAL;
1590
1591 result = 0;
1592 spin_lock_irqsave(&substream->lock, flags);
1593 if (substream->append) {
1594 if ((long)runtime->avail < count) {
1595 spin_unlock_irqrestore(&substream->lock, flags);
1596 return -EAGAIN;
1597 }
1598 }
1599 snd_rawmidi_buffer_ref(runtime);
1600 while (count > 0 && runtime->avail > 0) {
1601 count1 = runtime->buffer_size - runtime->appl_ptr;
1602 if (count1 > count)
1603 count1 = count;
1604 if (count1 > (long)runtime->avail)
1605 count1 = runtime->avail;
1606
1607 /* update runtime->appl_ptr before unlocking for userbuf */
1608 appl_ptr = runtime->appl_ptr;
1609 runtime->appl_ptr += count1;
1610 runtime->appl_ptr %= runtime->buffer_size;
1611 runtime->avail -= count1;
1612
1613 if (kernelbuf)
1614 memcpy(runtime->buffer + appl_ptr,
1615 kernelbuf + result, count1);
1616 else if (userbuf) {
1617 spin_unlock_irqrestore(&substream->lock, flags);
1618 if (copy_from_user(runtime->buffer + appl_ptr,
1619 userbuf + result, count1)) {
1620 spin_lock_irqsave(&substream->lock, flags);
1621 result = result > 0 ? result : -EFAULT;
1622 goto __end;
1623 }
1624 spin_lock_irqsave(&substream->lock, flags);
1625 }
1626 result += count1;
1627 count -= count1;
1628 }
1629 __end:
1630 count1 = runtime->avail < runtime->buffer_size;
1631 snd_rawmidi_buffer_unref(runtime);
1632 spin_unlock_irqrestore(&substream->lock, flags);
1633 if (count1)
1634 snd_rawmidi_output_trigger(substream, 1);
1635 return result;
1636}
1637
1638long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1639 const unsigned char *buf, long count)
1640{
1641 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1642}
1643EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1644
1645static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1646 size_t count, loff_t *offset)
1647{
1648 long result, timeout;
1649 int count1;
1650 struct snd_rawmidi_file *rfile;
1651 struct snd_rawmidi_runtime *runtime;
1652 struct snd_rawmidi_substream *substream;
1653
1654 rfile = file->private_data;
1655 substream = rfile->output;
1656 runtime = substream->runtime;
1657 /* we cannot put an atomic message to our buffer */
1658 if (substream->append && count > runtime->buffer_size)
1659 return -EIO;
1660 result = 0;
1661 while (count > 0) {
1662 spin_lock_irq(&substream->lock);
1663 while (!snd_rawmidi_ready_append(substream, count)) {
1664 wait_queue_entry_t wait;
1665
1666 if (file->f_flags & O_NONBLOCK) {
1667 spin_unlock_irq(&substream->lock);
1668 return result > 0 ? result : -EAGAIN;
1669 }
1670 init_waitqueue_entry(&wait, current);
1671 add_wait_queue(&runtime->sleep, &wait);
1672 set_current_state(TASK_INTERRUPTIBLE);
1673 spin_unlock_irq(&substream->lock);
1674 timeout = schedule_timeout(30 * HZ);
1675 remove_wait_queue(&runtime->sleep, &wait);
1676 if (rfile->rmidi->card->shutdown)
1677 return -ENODEV;
1678 if (signal_pending(current))
1679 return result > 0 ? result : -ERESTARTSYS;
1680 spin_lock_irq(&substream->lock);
1681 if (!runtime->avail && !timeout) {
1682 spin_unlock_irq(&substream->lock);
1683 return result > 0 ? result : -EIO;
1684 }
1685 }
1686 spin_unlock_irq(&substream->lock);
1687 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1688 if (count1 < 0)
1689 return result > 0 ? result : count1;
1690 result += count1;
1691 buf += count1;
1692 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1693 break;
1694 count -= count1;
1695 }
1696 if (file->f_flags & O_DSYNC) {
1697 spin_lock_irq(&substream->lock);
1698 while (runtime->avail != runtime->buffer_size) {
1699 wait_queue_entry_t wait;
1700 unsigned int last_avail = runtime->avail;
1701
1702 init_waitqueue_entry(&wait, current);
1703 add_wait_queue(&runtime->sleep, &wait);
1704 set_current_state(TASK_INTERRUPTIBLE);
1705 spin_unlock_irq(&substream->lock);
1706 timeout = schedule_timeout(30 * HZ);
1707 remove_wait_queue(&runtime->sleep, &wait);
1708 if (signal_pending(current))
1709 return result > 0 ? result : -ERESTARTSYS;
1710 if (runtime->avail == last_avail && !timeout)
1711 return result > 0 ? result : -EIO;
1712 spin_lock_irq(&substream->lock);
1713 }
1714 spin_unlock_irq(&substream->lock);
1715 }
1716 return result;
1717}
1718
1719static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1720{
1721 struct snd_rawmidi_file *rfile;
1722 struct snd_rawmidi_runtime *runtime;
1723 __poll_t mask;
1724
1725 rfile = file->private_data;
1726 if (rfile->input != NULL) {
1727 runtime = rfile->input->runtime;
1728 snd_rawmidi_input_trigger(rfile->input, 1);
1729 poll_wait(file, &runtime->sleep, wait);
1730 }
1731 if (rfile->output != NULL) {
1732 runtime = rfile->output->runtime;
1733 poll_wait(file, &runtime->sleep, wait);
1734 }
1735 mask = 0;
1736 if (rfile->input != NULL) {
1737 if (snd_rawmidi_ready(rfile->input))
1738 mask |= EPOLLIN | EPOLLRDNORM;
1739 }
1740 if (rfile->output != NULL) {
1741 if (snd_rawmidi_ready(rfile->output))
1742 mask |= EPOLLOUT | EPOLLWRNORM;
1743 }
1744 return mask;
1745}
1746
1747/*
1748 */
1749#ifdef CONFIG_COMPAT
1750#include "rawmidi_compat.c"
1751#else
1752#define snd_rawmidi_ioctl_compat NULL
1753#endif
1754
1755/*
1756 */
1757
1758static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1759 struct snd_info_buffer *buffer)
1760{
1761 struct snd_rawmidi *rmidi;
1762 struct snd_rawmidi_substream *substream;
1763 struct snd_rawmidi_runtime *runtime;
1764 unsigned long buffer_size, avail, xruns;
1765 unsigned int clock_type;
1766 static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1767
1768 rmidi = entry->private_data;
1769 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1770 if (IS_ENABLED(CONFIG_SND_UMP))
1771 snd_iprintf(buffer, "Type: %s\n",
1772 rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
1773 if (rmidi->ops && rmidi->ops->proc_read)
1774 rmidi->ops->proc_read(entry, buffer);
1775 mutex_lock(&rmidi->open_mutex);
1776 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1777 list_for_each_entry(substream,
1778 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1779 list) {
1780 snd_iprintf(buffer,
1781 "Output %d\n"
1782 " Tx bytes : %lu\n",
1783 substream->number,
1784 (unsigned long) substream->bytes);
1785 if (substream->opened) {
1786 snd_iprintf(buffer,
1787 " Owner PID : %d\n",
1788 pid_vnr(substream->pid));
1789 runtime = substream->runtime;
1790 spin_lock_irq(&substream->lock);
1791 buffer_size = runtime->buffer_size;
1792 avail = runtime->avail;
1793 spin_unlock_irq(&substream->lock);
1794 snd_iprintf(buffer,
1795 " Mode : %s\n"
1796 " Buffer size : %lu\n"
1797 " Avail : %lu\n",
1798 runtime->oss ? "OSS compatible" : "native",
1799 buffer_size, avail);
1800 }
1801 }
1802 }
1803 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1804 list_for_each_entry(substream,
1805 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1806 list) {
1807 snd_iprintf(buffer,
1808 "Input %d\n"
1809 " Rx bytes : %lu\n",
1810 substream->number,
1811 (unsigned long) substream->bytes);
1812 if (substream->opened) {
1813 snd_iprintf(buffer,
1814 " Owner PID : %d\n",
1815 pid_vnr(substream->pid));
1816 runtime = substream->runtime;
1817 spin_lock_irq(&substream->lock);
1818 buffer_size = runtime->buffer_size;
1819 avail = runtime->avail;
1820 xruns = runtime->xruns;
1821 spin_unlock_irq(&substream->lock);
1822 snd_iprintf(buffer,
1823 " Buffer size : %lu\n"
1824 " Avail : %lu\n"
1825 " Overruns : %lu\n",
1826 buffer_size, avail, xruns);
1827 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1828 clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1829 if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1830 snd_iprintf(buffer,
1831 " Framing : tstamp\n"
1832 " Clock type : %s\n",
1833 clock_names[clock_type]);
1834 }
1835 }
1836 }
1837 }
1838 mutex_unlock(&rmidi->open_mutex);
1839}
1840
1841/*
1842 * Register functions
1843 */
1844
1845static const struct file_operations snd_rawmidi_f_ops = {
1846 .owner = THIS_MODULE,
1847 .read = snd_rawmidi_read,
1848 .write = snd_rawmidi_write,
1849 .open = snd_rawmidi_open,
1850 .release = snd_rawmidi_release,
1851 .llseek = no_llseek,
1852 .poll = snd_rawmidi_poll,
1853 .unlocked_ioctl = snd_rawmidi_ioctl,
1854 .compat_ioctl = snd_rawmidi_ioctl_compat,
1855};
1856
1857static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1858 struct snd_rawmidi_str *stream,
1859 int direction,
1860 int count)
1861{
1862 struct snd_rawmidi_substream *substream;
1863 int idx;
1864
1865 for (idx = 0; idx < count; idx++) {
1866 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1867 if (!substream)
1868 return -ENOMEM;
1869 substream->stream = direction;
1870 substream->number = idx;
1871 substream->rmidi = rmidi;
1872 substream->pstr = stream;
1873 spin_lock_init(&substream->lock);
1874 list_add_tail(&substream->list, &stream->substreams);
1875 stream->substream_count++;
1876 }
1877 return 0;
1878}
1879
1880/* used for both rawmidi and ump */
1881int snd_rawmidi_init(struct snd_rawmidi *rmidi,
1882 struct snd_card *card, char *id, int device,
1883 int output_count, int input_count,
1884 unsigned int info_flags)
1885{
1886 int err;
1887 static const struct snd_device_ops ops = {
1888 .dev_free = snd_rawmidi_dev_free,
1889 .dev_register = snd_rawmidi_dev_register,
1890 .dev_disconnect = snd_rawmidi_dev_disconnect,
1891 };
1892
1893 rmidi->card = card;
1894 rmidi->device = device;
1895 mutex_init(&rmidi->open_mutex);
1896 init_waitqueue_head(&rmidi->open_wait);
1897 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1898 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1899 rmidi->info_flags = info_flags;
1900
1901 if (id != NULL)
1902 strscpy(rmidi->id, id, sizeof(rmidi->id));
1903
1904 err = snd_device_alloc(&rmidi->dev, card);
1905 if (err < 0)
1906 return err;
1907 if (rawmidi_is_ump(rmidi))
1908 dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);
1909 else
1910 dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);
1911
1912 err = snd_rawmidi_alloc_substreams(rmidi,
1913 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1914 SNDRV_RAWMIDI_STREAM_INPUT,
1915 input_count);
1916 if (err < 0)
1917 return err;
1918 err = snd_rawmidi_alloc_substreams(rmidi,
1919 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1920 SNDRV_RAWMIDI_STREAM_OUTPUT,
1921 output_count);
1922 if (err < 0)
1923 return err;
1924 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1925 if (err < 0)
1926 return err;
1927 return 0;
1928}
1929EXPORT_SYMBOL_GPL(snd_rawmidi_init);
1930
1931/**
1932 * snd_rawmidi_new - create a rawmidi instance
1933 * @card: the card instance
1934 * @id: the id string
1935 * @device: the device index
1936 * @output_count: the number of output streams
1937 * @input_count: the number of input streams
1938 * @rrawmidi: the pointer to store the new rawmidi instance
1939 *
1940 * Creates a new rawmidi instance.
1941 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1942 *
1943 * Return: Zero if successful, or a negative error code on failure.
1944 */
1945int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1946 int output_count, int input_count,
1947 struct snd_rawmidi **rrawmidi)
1948{
1949 struct snd_rawmidi *rmidi;
1950 int err;
1951
1952 if (rrawmidi)
1953 *rrawmidi = NULL;
1954 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1955 if (!rmidi)
1956 return -ENOMEM;
1957 err = snd_rawmidi_init(rmidi, card, id, device,
1958 output_count, input_count, 0);
1959 if (err < 0) {
1960 snd_rawmidi_free(rmidi);
1961 return err;
1962 }
1963 if (rrawmidi)
1964 *rrawmidi = rmidi;
1965 return 0;
1966}
1967EXPORT_SYMBOL(snd_rawmidi_new);
1968
1969static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1970{
1971 struct snd_rawmidi_substream *substream;
1972
1973 while (!list_empty(&stream->substreams)) {
1974 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1975 list_del(&substream->list);
1976 kfree(substream);
1977 }
1978}
1979
1980/* called from ump.c, too */
1981int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1982{
1983 if (!rmidi)
1984 return 0;
1985
1986 snd_info_free_entry(rmidi->proc_entry);
1987 rmidi->proc_entry = NULL;
1988 if (rmidi->ops && rmidi->ops->dev_unregister)
1989 rmidi->ops->dev_unregister(rmidi);
1990
1991 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1992 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1993 if (rmidi->private_free)
1994 rmidi->private_free(rmidi);
1995 put_device(rmidi->dev);
1996 kfree(rmidi);
1997 return 0;
1998}
1999EXPORT_SYMBOL_GPL(snd_rawmidi_free);
2000
2001static int snd_rawmidi_dev_free(struct snd_device *device)
2002{
2003 struct snd_rawmidi *rmidi = device->device_data;
2004
2005 return snd_rawmidi_free(rmidi);
2006}
2007
2008#if IS_ENABLED(CONFIG_SND_SEQUENCER)
2009static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
2010{
2011 struct snd_rawmidi *rmidi = device->private_data;
2012
2013 rmidi->seq_dev = NULL;
2014}
2015#endif
2016
2017static int snd_rawmidi_dev_register(struct snd_device *device)
2018{
2019 int err;
2020 struct snd_info_entry *entry;
2021 char name[16];
2022 struct snd_rawmidi *rmidi = device->device_data;
2023
2024 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
2025 return -ENOMEM;
2026 err = 0;
2027 mutex_lock(®ister_mutex);
2028 if (snd_rawmidi_search(rmidi->card, rmidi->device))
2029 err = -EBUSY;
2030 else
2031 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
2032 mutex_unlock(®ister_mutex);
2033 if (err < 0)
2034 return err;
2035
2036 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
2037 rmidi->card, rmidi->device,
2038 &snd_rawmidi_f_ops, rmidi, rmidi->dev);
2039 if (err < 0) {
2040 rmidi_err(rmidi, "unable to register\n");
2041 goto error;
2042 }
2043 if (rmidi->ops && rmidi->ops->dev_register) {
2044 err = rmidi->ops->dev_register(rmidi);
2045 if (err < 0)
2046 goto error_unregister;
2047 }
2048#ifdef CONFIG_SND_OSSEMUL
2049 rmidi->ossreg = 0;
2050 if (!rawmidi_is_ump(rmidi) &&
2051 (int)rmidi->device == midi_map[rmidi->card->number]) {
2052 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2053 rmidi->card, 0, &snd_rawmidi_f_ops,
2054 rmidi) < 0) {
2055 rmidi_err(rmidi,
2056 "unable to register OSS rawmidi device %i:%i\n",
2057 rmidi->card->number, 0);
2058 } else {
2059 rmidi->ossreg++;
2060#ifdef SNDRV_OSS_INFO_DEV_MIDI
2061 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
2062#endif
2063 }
2064 }
2065 if (!rawmidi_is_ump(rmidi) &&
2066 (int)rmidi->device == amidi_map[rmidi->card->number]) {
2067 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2068 rmidi->card, 1, &snd_rawmidi_f_ops,
2069 rmidi) < 0) {
2070 rmidi_err(rmidi,
2071 "unable to register OSS rawmidi device %i:%i\n",
2072 rmidi->card->number, 1);
2073 } else {
2074 rmidi->ossreg++;
2075 }
2076 }
2077#endif /* CONFIG_SND_OSSEMUL */
2078 sprintf(name, "midi%d", rmidi->device);
2079 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
2080 if (entry) {
2081 entry->private_data = rmidi;
2082 entry->c.text.read = snd_rawmidi_proc_info_read;
2083 if (snd_info_register(entry) < 0) {
2084 snd_info_free_entry(entry);
2085 entry = NULL;
2086 }
2087 }
2088 rmidi->proc_entry = entry;
2089#if IS_ENABLED(CONFIG_SND_SEQUENCER)
2090 /* no own registration mechanism? */
2091 if (!rmidi->ops || !rmidi->ops->dev_register) {
2092 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2093 rmidi->seq_dev->private_data = rmidi;
2094 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2095 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2096 snd_device_register(rmidi->card, rmidi->seq_dev);
2097 }
2098 }
2099#endif
2100 return 0;
2101
2102 error_unregister:
2103 snd_unregister_device(rmidi->dev);
2104 error:
2105 mutex_lock(®ister_mutex);
2106 list_del(&rmidi->list);
2107 mutex_unlock(®ister_mutex);
2108 return err;
2109}
2110
2111static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2112{
2113 struct snd_rawmidi *rmidi = device->device_data;
2114 int dir;
2115
2116 mutex_lock(®ister_mutex);
2117 mutex_lock(&rmidi->open_mutex);
2118 wake_up(&rmidi->open_wait);
2119 list_del_init(&rmidi->list);
2120 for (dir = 0; dir < 2; dir++) {
2121 struct snd_rawmidi_substream *s;
2122
2123 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2124 if (s->runtime)
2125 wake_up(&s->runtime->sleep);
2126 }
2127 }
2128
2129#ifdef CONFIG_SND_OSSEMUL
2130 if (rmidi->ossreg) {
2131 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2132 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2133#ifdef SNDRV_OSS_INFO_DEV_MIDI
2134 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2135#endif
2136 }
2137 if ((int)rmidi->device == amidi_map[rmidi->card->number])
2138 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2139 rmidi->ossreg = 0;
2140 }
2141#endif /* CONFIG_SND_OSSEMUL */
2142 snd_unregister_device(rmidi->dev);
2143 mutex_unlock(&rmidi->open_mutex);
2144 mutex_unlock(®ister_mutex);
2145 return 0;
2146}
2147
2148/**
2149 * snd_rawmidi_set_ops - set the rawmidi operators
2150 * @rmidi: the rawmidi instance
2151 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2152 * @ops: the operator table
2153 *
2154 * Sets the rawmidi operators for the given stream direction.
2155 */
2156void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2157 const struct snd_rawmidi_ops *ops)
2158{
2159 struct snd_rawmidi_substream *substream;
2160
2161 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2162 substream->ops = ops;
2163}
2164EXPORT_SYMBOL(snd_rawmidi_set_ops);
2165
2166/*
2167 * ENTRY functions
2168 */
2169
2170static int __init alsa_rawmidi_init(void)
2171{
2172
2173 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2174 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2175#ifdef CONFIG_SND_OSSEMUL
2176 { int i;
2177 /* check device map table */
2178 for (i = 0; i < SNDRV_CARDS; i++) {
2179 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2180 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2181 i, midi_map[i]);
2182 midi_map[i] = 0;
2183 }
2184 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2185 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2186 i, amidi_map[i]);
2187 amidi_map[i] = 1;
2188 }
2189 }
2190 }
2191#endif /* CONFIG_SND_OSSEMUL */
2192 return 0;
2193}
2194
2195static void __exit alsa_rawmidi_exit(void)
2196{
2197 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2198 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2199}
2200
2201module_init(alsa_rawmidi_init)
2202module_exit(alsa_rawmidi_exit)