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