Loading...
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#include <sound/ump.h>
25
26MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
27MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
28MODULE_LICENSE("GPL");
29
30#ifdef CONFIG_SND_OSSEMUL
31static int midi_map[SNDRV_CARDS];
32static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
33module_param_array(midi_map, int, NULL, 0444);
34MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
35module_param_array(amidi_map, int, NULL, 0444);
36MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
37#endif /* CONFIG_SND_OSSEMUL */
38
39static int snd_rawmidi_dev_free(struct snd_device *device);
40static int snd_rawmidi_dev_register(struct snd_device *device);
41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
42
43static LIST_HEAD(snd_rawmidi_devices);
44static DEFINE_MUTEX(register_mutex);
45
46#define rmidi_err(rmidi, fmt, args...) \
47 dev_err((rmidi)->dev, fmt, ##args)
48#define rmidi_warn(rmidi, fmt, args...) \
49 dev_warn((rmidi)->dev, fmt, ##args)
50#define rmidi_dbg(rmidi, fmt, args...) \
51 dev_dbg((rmidi)->dev, fmt, ##args)
52
53struct snd_rawmidi_status32 {
54 s32 stream;
55 s32 tstamp_sec; /* Timestamp */
56 s32 tstamp_nsec;
57 u32 avail; /* available bytes */
58 u32 xruns; /* count of overruns since last status (in bytes) */
59 unsigned char reserved[16]; /* reserved for future use */
60};
61
62#define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32)
63
64struct snd_rawmidi_status64 {
65 int stream;
66 u8 rsvd[4]; /* alignment */
67 s64 tstamp_sec; /* Timestamp */
68 s64 tstamp_nsec;
69 size_t avail; /* available bytes */
70 size_t xruns; /* count of overruns since last status (in bytes) */
71 unsigned char reserved[16]; /* reserved for future use */
72};
73
74#define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64)
75
76#define rawmidi_is_ump(rmidi) \
77 (IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP))
78
79static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
80{
81 struct snd_rawmidi *rawmidi;
82
83 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
84 if (rawmidi->card == card && rawmidi->device == device)
85 return rawmidi;
86 return NULL;
87}
88
89static inline unsigned short snd_rawmidi_file_flags(struct file *file)
90{
91 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
92 case FMODE_WRITE:
93 return SNDRV_RAWMIDI_LFLG_OUTPUT;
94 case FMODE_READ:
95 return SNDRV_RAWMIDI_LFLG_INPUT;
96 default:
97 return SNDRV_RAWMIDI_LFLG_OPEN;
98 }
99}
100
101static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
102{
103 return runtime->avail >= runtime->avail_min;
104}
105
106static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
107{
108 unsigned long flags;
109 bool ready;
110
111 spin_lock_irqsave(&substream->lock, flags);
112 ready = __snd_rawmidi_ready(substream->runtime);
113 spin_unlock_irqrestore(&substream->lock, flags);
114 return ready;
115}
116
117static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
118 size_t count)
119{
120 struct snd_rawmidi_runtime *runtime = substream->runtime;
121
122 return runtime->avail >= runtime->avail_min &&
123 (!substream->append || runtime->avail >= count);
124}
125
126static void snd_rawmidi_input_event_work(struct work_struct *work)
127{
128 struct snd_rawmidi_runtime *runtime =
129 container_of(work, struct snd_rawmidi_runtime, event_work);
130
131 if (runtime->event)
132 runtime->event(runtime->substream);
133}
134
135/* buffer refcount management: call with substream->lock held */
136static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
137{
138 runtime->buffer_ref++;
139}
140
141static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
142{
143 runtime->buffer_ref--;
144}
145
146static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
147{
148 int loop = HZ;
149
150 spin_lock_irq(&substream->lock);
151 while (substream->runtime->buffer_ref) {
152 spin_unlock_irq(&substream->lock);
153 if (!--loop) {
154 rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
155 return;
156 }
157 schedule_timeout_uninterruptible(1);
158 spin_lock_irq(&substream->lock);
159 }
160 spin_unlock_irq(&substream->lock);
161}
162
163static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
164{
165 struct snd_rawmidi_runtime *runtime;
166
167 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
168 if (!runtime)
169 return -ENOMEM;
170 runtime->substream = substream;
171 init_waitqueue_head(&runtime->sleep);
172 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
173 runtime->event = NULL;
174 runtime->buffer_size = PAGE_SIZE;
175 runtime->avail_min = 1;
176 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
177 runtime->avail = 0;
178 else
179 runtime->avail = runtime->buffer_size;
180 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
181 if (!runtime->buffer) {
182 kfree(runtime);
183 return -ENOMEM;
184 }
185 runtime->appl_ptr = runtime->hw_ptr = 0;
186 substream->runtime = runtime;
187 if (rawmidi_is_ump(substream->rmidi))
188 runtime->align = 3;
189 return 0;
190}
191
192/* get the current alignment (either 0 or 3) */
193static inline int get_align(struct snd_rawmidi_runtime *runtime)
194{
195 if (IS_ENABLED(CONFIG_SND_UMP))
196 return runtime->align;
197 else
198 return 0;
199}
200
201/* get the trimmed size with the current alignment */
202#define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))
203
204static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
205{
206 struct snd_rawmidi_runtime *runtime = substream->runtime;
207
208 kvfree(runtime->buffer);
209 kfree(runtime);
210 substream->runtime = NULL;
211 return 0;
212}
213
214static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
215{
216 if (!substream->opened)
217 return;
218 substream->ops->trigger(substream, up);
219}
220
221static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
222{
223 if (!substream->opened)
224 return;
225 substream->ops->trigger(substream, up);
226 if (!up)
227 cancel_work_sync(&substream->runtime->event_work);
228}
229
230static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
231 bool is_input)
232{
233 runtime->drain = 0;
234 runtime->appl_ptr = runtime->hw_ptr = 0;
235 runtime->avail = is_input ? 0 : runtime->buffer_size;
236}
237
238static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
239 bool is_input)
240{
241 unsigned long flags;
242
243 spin_lock_irqsave(&substream->lock, flags);
244 if (substream->opened && substream->runtime)
245 __reset_runtime_ptrs(substream->runtime, is_input);
246 spin_unlock_irqrestore(&substream->lock, flags);
247}
248
249int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
250{
251 snd_rawmidi_output_trigger(substream, 0);
252 reset_runtime_ptrs(substream, false);
253 return 0;
254}
255EXPORT_SYMBOL(snd_rawmidi_drop_output);
256
257int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
258{
259 int err = 0;
260 long timeout;
261 struct snd_rawmidi_runtime *runtime;
262
263 spin_lock_irq(&substream->lock);
264 runtime = substream->runtime;
265 if (!substream->opened || !runtime || !runtime->buffer) {
266 err = -EINVAL;
267 } else {
268 snd_rawmidi_buffer_ref(runtime);
269 runtime->drain = 1;
270 }
271 spin_unlock_irq(&substream->lock);
272 if (err < 0)
273 return err;
274
275 timeout = wait_event_interruptible_timeout(runtime->sleep,
276 (runtime->avail >= runtime->buffer_size),
277 10*HZ);
278
279 spin_lock_irq(&substream->lock);
280 if (signal_pending(current))
281 err = -ERESTARTSYS;
282 if (runtime->avail < runtime->buffer_size && !timeout) {
283 rmidi_warn(substream->rmidi,
284 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
285 (long)runtime->avail, (long)runtime->buffer_size);
286 err = -EIO;
287 }
288 runtime->drain = 0;
289 spin_unlock_irq(&substream->lock);
290
291 if (err != -ERESTARTSYS) {
292 /* we need wait a while to make sure that Tx FIFOs are empty */
293 if (substream->ops->drain)
294 substream->ops->drain(substream);
295 else
296 msleep(50);
297 snd_rawmidi_drop_output(substream);
298 }
299
300 spin_lock_irq(&substream->lock);
301 snd_rawmidi_buffer_unref(runtime);
302 spin_unlock_irq(&substream->lock);
303
304 return err;
305}
306EXPORT_SYMBOL(snd_rawmidi_drain_output);
307
308int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
309{
310 snd_rawmidi_input_trigger(substream, 0);
311 reset_runtime_ptrs(substream, true);
312 return 0;
313}
314EXPORT_SYMBOL(snd_rawmidi_drain_input);
315
316/* look for an available substream for the given stream direction;
317 * if a specific subdevice is given, try to assign it
318 */
319static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
320 int stream, int mode,
321 struct snd_rawmidi_substream **sub_ret)
322{
323 struct snd_rawmidi_substream *substream;
324 struct snd_rawmidi_str *s = &rmidi->streams[stream];
325 static const unsigned int info_flags[2] = {
326 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
327 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
328 };
329
330 if (!(rmidi->info_flags & info_flags[stream]))
331 return -ENXIO;
332 if (subdevice >= 0 && subdevice >= s->substream_count)
333 return -ENODEV;
334
335 list_for_each_entry(substream, &s->substreams, list) {
336 if (substream->opened) {
337 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
338 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
339 !substream->append)
340 continue;
341 }
342 if (subdevice < 0 || subdevice == substream->number) {
343 *sub_ret = substream;
344 return 0;
345 }
346 }
347 return -EAGAIN;
348}
349
350/* open and do ref-counting for the given substream */
351static int open_substream(struct snd_rawmidi *rmidi,
352 struct snd_rawmidi_substream *substream,
353 int mode)
354{
355 int err;
356
357 if (substream->use_count == 0) {
358 err = snd_rawmidi_runtime_create(substream);
359 if (err < 0)
360 return err;
361 err = substream->ops->open(substream);
362 if (err < 0) {
363 snd_rawmidi_runtime_free(substream);
364 return err;
365 }
366 spin_lock_irq(&substream->lock);
367 substream->opened = 1;
368 substream->active_sensing = 0;
369 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
370 substream->append = 1;
371 substream->pid = get_pid(task_pid(current));
372 rmidi->streams[substream->stream].substream_opened++;
373 spin_unlock_irq(&substream->lock);
374 }
375 substream->use_count++;
376 return 0;
377}
378
379static void close_substream(struct snd_rawmidi *rmidi,
380 struct snd_rawmidi_substream *substream,
381 int cleanup);
382
383static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
384 struct snd_rawmidi_file *rfile)
385{
386 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
387 int err;
388
389 rfile->input = rfile->output = NULL;
390 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
391 err = assign_substream(rmidi, subdevice,
392 SNDRV_RAWMIDI_STREAM_INPUT,
393 mode, &sinput);
394 if (err < 0)
395 return err;
396 }
397 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
398 err = assign_substream(rmidi, subdevice,
399 SNDRV_RAWMIDI_STREAM_OUTPUT,
400 mode, &soutput);
401 if (err < 0)
402 return err;
403 }
404
405 if (sinput) {
406 err = open_substream(rmidi, sinput, mode);
407 if (err < 0)
408 return err;
409 }
410 if (soutput) {
411 err = open_substream(rmidi, soutput, mode);
412 if (err < 0) {
413 if (sinput)
414 close_substream(rmidi, sinput, 0);
415 return err;
416 }
417 }
418
419 rfile->rmidi = rmidi;
420 rfile->input = sinput;
421 rfile->output = soutput;
422 return 0;
423}
424
425/* called from sound/core/seq/seq_midi.c */
426int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
427 int mode, struct snd_rawmidi_file *rfile)
428{
429 int err;
430
431 if (snd_BUG_ON(!rfile))
432 return -EINVAL;
433 if (!try_module_get(rmidi->card->module))
434 return -ENXIO;
435
436 mutex_lock(&rmidi->open_mutex);
437 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
438 mutex_unlock(&rmidi->open_mutex);
439 if (err < 0)
440 module_put(rmidi->card->module);
441 return err;
442}
443EXPORT_SYMBOL(snd_rawmidi_kernel_open);
444
445static int snd_rawmidi_open(struct inode *inode, struct file *file)
446{
447 int maj = imajor(inode);
448 struct snd_card *card;
449 int subdevice;
450 unsigned short fflags;
451 int err;
452 struct snd_rawmidi *rmidi;
453 struct snd_rawmidi_file *rawmidi_file = NULL;
454 wait_queue_entry_t wait;
455
456 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
457 return -EINVAL; /* invalid combination */
458
459 err = stream_open(inode, file);
460 if (err < 0)
461 return err;
462
463 if (maj == snd_major) {
464 rmidi = snd_lookup_minor_data(iminor(inode),
465 SNDRV_DEVICE_TYPE_RAWMIDI);
466#ifdef CONFIG_SND_OSSEMUL
467 } else if (maj == SOUND_MAJOR) {
468 rmidi = snd_lookup_oss_minor_data(iminor(inode),
469 SNDRV_OSS_DEVICE_TYPE_MIDI);
470#endif
471 } else
472 return -ENXIO;
473
474 if (rmidi == NULL)
475 return -ENODEV;
476
477 if (!try_module_get(rmidi->card->module)) {
478 snd_card_unref(rmidi->card);
479 return -ENXIO;
480 }
481
482 mutex_lock(&rmidi->open_mutex);
483 card = rmidi->card;
484 err = snd_card_file_add(card, file);
485 if (err < 0)
486 goto __error_card;
487 fflags = snd_rawmidi_file_flags(file);
488 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
489 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
490 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
491 if (rawmidi_file == NULL) {
492 err = -ENOMEM;
493 goto __error;
494 }
495 rawmidi_file->user_pversion = 0;
496 init_waitqueue_entry(&wait, current);
497 add_wait_queue(&rmidi->open_wait, &wait);
498 while (1) {
499 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
500 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
501 if (err >= 0)
502 break;
503 if (err == -EAGAIN) {
504 if (file->f_flags & O_NONBLOCK) {
505 err = -EBUSY;
506 break;
507 }
508 } else
509 break;
510 set_current_state(TASK_INTERRUPTIBLE);
511 mutex_unlock(&rmidi->open_mutex);
512 schedule();
513 mutex_lock(&rmidi->open_mutex);
514 if (rmidi->card->shutdown) {
515 err = -ENODEV;
516 break;
517 }
518 if (signal_pending(current)) {
519 err = -ERESTARTSYS;
520 break;
521 }
522 }
523 remove_wait_queue(&rmidi->open_wait, &wait);
524 if (err < 0) {
525 kfree(rawmidi_file);
526 goto __error;
527 }
528#ifdef CONFIG_SND_OSSEMUL
529 if (rawmidi_file->input && rawmidi_file->input->runtime)
530 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
531 if (rawmidi_file->output && rawmidi_file->output->runtime)
532 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
533#endif
534 file->private_data = rawmidi_file;
535 mutex_unlock(&rmidi->open_mutex);
536 snd_card_unref(rmidi->card);
537 return 0;
538
539 __error:
540 snd_card_file_remove(card, file);
541 __error_card:
542 mutex_unlock(&rmidi->open_mutex);
543 module_put(rmidi->card->module);
544 snd_card_unref(rmidi->card);
545 return err;
546}
547
548static void close_substream(struct snd_rawmidi *rmidi,
549 struct snd_rawmidi_substream *substream,
550 int cleanup)
551{
552 if (--substream->use_count)
553 return;
554
555 if (cleanup) {
556 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
557 snd_rawmidi_input_trigger(substream, 0);
558 else {
559 if (substream->active_sensing) {
560 unsigned char buf = 0xfe;
561 /* sending single active sensing message
562 * to shut the device up
563 */
564 snd_rawmidi_kernel_write(substream, &buf, 1);
565 }
566 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
567 snd_rawmidi_output_trigger(substream, 0);
568 }
569 snd_rawmidi_buffer_ref_sync(substream);
570 }
571 spin_lock_irq(&substream->lock);
572 substream->opened = 0;
573 substream->append = 0;
574 spin_unlock_irq(&substream->lock);
575 substream->ops->close(substream);
576 if (substream->runtime->private_free)
577 substream->runtime->private_free(substream);
578 snd_rawmidi_runtime_free(substream);
579 put_pid(substream->pid);
580 substream->pid = NULL;
581 rmidi->streams[substream->stream].substream_opened--;
582}
583
584static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
585{
586 struct snd_rawmidi *rmidi;
587
588 rmidi = rfile->rmidi;
589 mutex_lock(&rmidi->open_mutex);
590 if (rfile->input) {
591 close_substream(rmidi, rfile->input, 1);
592 rfile->input = NULL;
593 }
594 if (rfile->output) {
595 close_substream(rmidi, rfile->output, 1);
596 rfile->output = NULL;
597 }
598 rfile->rmidi = NULL;
599 mutex_unlock(&rmidi->open_mutex);
600 wake_up(&rmidi->open_wait);
601}
602
603/* called from sound/core/seq/seq_midi.c */
604int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
605{
606 struct snd_rawmidi *rmidi;
607
608 if (snd_BUG_ON(!rfile))
609 return -ENXIO;
610
611 rmidi = rfile->rmidi;
612 rawmidi_release_priv(rfile);
613 module_put(rmidi->card->module);
614 return 0;
615}
616EXPORT_SYMBOL(snd_rawmidi_kernel_release);
617
618static int snd_rawmidi_release(struct inode *inode, struct file *file)
619{
620 struct snd_rawmidi_file *rfile;
621 struct snd_rawmidi *rmidi;
622 struct module *module;
623
624 rfile = file->private_data;
625 rmidi = rfile->rmidi;
626 rawmidi_release_priv(rfile);
627 kfree(rfile);
628 module = rmidi->card->module;
629 snd_card_file_remove(rmidi->card, file);
630 module_put(module);
631 return 0;
632}
633
634static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
635 struct snd_rawmidi_info *info)
636{
637 struct snd_rawmidi *rmidi;
638
639 if (substream == NULL)
640 return -ENODEV;
641 rmidi = substream->rmidi;
642 memset(info, 0, sizeof(*info));
643 info->card = rmidi->card->number;
644 info->device = rmidi->device;
645 info->subdevice = substream->number;
646 info->stream = substream->stream;
647 info->flags = rmidi->info_flags;
648 strcpy(info->id, rmidi->id);
649 strcpy(info->name, rmidi->name);
650 strcpy(info->subname, substream->name);
651 info->subdevices_count = substream->pstr->substream_count;
652 info->subdevices_avail = (substream->pstr->substream_count -
653 substream->pstr->substream_opened);
654 return 0;
655}
656
657static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
658 struct snd_rawmidi_info __user *_info)
659{
660 struct snd_rawmidi_info info;
661 int err;
662
663 err = snd_rawmidi_info(substream, &info);
664 if (err < 0)
665 return err;
666 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
667 return -EFAULT;
668 return 0;
669}
670
671static int __snd_rawmidi_info_select(struct snd_card *card,
672 struct snd_rawmidi_info *info)
673{
674 struct snd_rawmidi *rmidi;
675 struct snd_rawmidi_str *pstr;
676 struct snd_rawmidi_substream *substream;
677
678 rmidi = snd_rawmidi_search(card, info->device);
679 if (!rmidi)
680 return -ENXIO;
681 if (info->stream < 0 || info->stream > 1)
682 return -EINVAL;
683 info->stream = array_index_nospec(info->stream, 2);
684 pstr = &rmidi->streams[info->stream];
685 if (pstr->substream_count == 0)
686 return -ENOENT;
687 if (info->subdevice >= pstr->substream_count)
688 return -ENXIO;
689 list_for_each_entry(substream, &pstr->substreams, list) {
690 if ((unsigned int)substream->number == info->subdevice)
691 return snd_rawmidi_info(substream, info);
692 }
693 return -ENXIO;
694}
695
696int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
697{
698 int ret;
699
700 mutex_lock(®ister_mutex);
701 ret = __snd_rawmidi_info_select(card, info);
702 mutex_unlock(®ister_mutex);
703 return ret;
704}
705EXPORT_SYMBOL(snd_rawmidi_info_select);
706
707static int snd_rawmidi_info_select_user(struct snd_card *card,
708 struct snd_rawmidi_info __user *_info)
709{
710 int err;
711 struct snd_rawmidi_info info;
712
713 if (get_user(info.device, &_info->device))
714 return -EFAULT;
715 if (get_user(info.stream, &_info->stream))
716 return -EFAULT;
717 if (get_user(info.subdevice, &_info->subdevice))
718 return -EFAULT;
719 err = snd_rawmidi_info_select(card, &info);
720 if (err < 0)
721 return err;
722 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
723 return -EFAULT;
724 return 0;
725}
726
727static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
728 struct snd_rawmidi_params *params,
729 bool is_input)
730{
731 struct snd_rawmidi_runtime *runtime = substream->runtime;
732 char *newbuf, *oldbuf;
733 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
734
735 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
736 return -EINVAL;
737 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
738 return -EINVAL;
739 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
740 return -EINVAL;
741 if (params->buffer_size & get_align(runtime))
742 return -EINVAL;
743 if (params->buffer_size != runtime->buffer_size) {
744 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
745 if (!newbuf)
746 return -ENOMEM;
747 spin_lock_irq(&substream->lock);
748 if (runtime->buffer_ref) {
749 spin_unlock_irq(&substream->lock);
750 kvfree(newbuf);
751 return -EBUSY;
752 }
753 oldbuf = runtime->buffer;
754 runtime->buffer = newbuf;
755 runtime->buffer_size = params->buffer_size;
756 __reset_runtime_ptrs(runtime, is_input);
757 spin_unlock_irq(&substream->lock);
758 kvfree(oldbuf);
759 }
760 runtime->avail_min = params->avail_min;
761 return 0;
762}
763
764int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
765 struct snd_rawmidi_params *params)
766{
767 int err;
768
769 snd_rawmidi_drain_output(substream);
770 mutex_lock(&substream->rmidi->open_mutex);
771 if (substream->append && substream->use_count > 1)
772 err = -EBUSY;
773 else
774 err = resize_runtime_buffer(substream, params, false);
775
776 if (!err)
777 substream->active_sensing = !params->no_active_sensing;
778 mutex_unlock(&substream->rmidi->open_mutex);
779 return err;
780}
781EXPORT_SYMBOL(snd_rawmidi_output_params);
782
783int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
784 struct snd_rawmidi_params *params)
785{
786 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
787 unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
788 int err;
789
790 snd_rawmidi_drain_input(substream);
791 mutex_lock(&substream->rmidi->open_mutex);
792 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
793 err = -EINVAL;
794 else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
795 err = -EINVAL;
796 else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
797 err = -EINVAL;
798 else
799 err = resize_runtime_buffer(substream, params, true);
800
801 if (!err) {
802 substream->framing = framing;
803 substream->clock_type = clock_type;
804 }
805 mutex_unlock(&substream->rmidi->open_mutex);
806 return 0;
807}
808EXPORT_SYMBOL(snd_rawmidi_input_params);
809
810static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
811 struct snd_rawmidi_status64 *status)
812{
813 struct snd_rawmidi_runtime *runtime = substream->runtime;
814
815 memset(status, 0, sizeof(*status));
816 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
817 spin_lock_irq(&substream->lock);
818 status->avail = runtime->avail;
819 spin_unlock_irq(&substream->lock);
820 return 0;
821}
822
823static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
824 struct snd_rawmidi_status64 *status)
825{
826 struct snd_rawmidi_runtime *runtime = substream->runtime;
827
828 memset(status, 0, sizeof(*status));
829 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
830 spin_lock_irq(&substream->lock);
831 status->avail = runtime->avail;
832 status->xruns = runtime->xruns;
833 runtime->xruns = 0;
834 spin_unlock_irq(&substream->lock);
835 return 0;
836}
837
838static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
839 struct snd_rawmidi_status32 __user *argp)
840{
841 int err = 0;
842 struct snd_rawmidi_status32 __user *status = argp;
843 struct snd_rawmidi_status32 status32;
844 struct snd_rawmidi_status64 status64;
845
846 if (copy_from_user(&status32, argp,
847 sizeof(struct snd_rawmidi_status32)))
848 return -EFAULT;
849
850 switch (status32.stream) {
851 case SNDRV_RAWMIDI_STREAM_OUTPUT:
852 if (rfile->output == NULL)
853 return -EINVAL;
854 err = snd_rawmidi_output_status(rfile->output, &status64);
855 break;
856 case SNDRV_RAWMIDI_STREAM_INPUT:
857 if (rfile->input == NULL)
858 return -EINVAL;
859 err = snd_rawmidi_input_status(rfile->input, &status64);
860 break;
861 default:
862 return -EINVAL;
863 }
864 if (err < 0)
865 return err;
866
867 status32 = (struct snd_rawmidi_status32) {
868 .stream = status64.stream,
869 .tstamp_sec = status64.tstamp_sec,
870 .tstamp_nsec = status64.tstamp_nsec,
871 .avail = status64.avail,
872 .xruns = status64.xruns,
873 };
874
875 if (copy_to_user(status, &status32, sizeof(*status)))
876 return -EFAULT;
877
878 return 0;
879}
880
881static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
882 struct snd_rawmidi_status64 __user *argp)
883{
884 int err = 0;
885 struct snd_rawmidi_status64 status;
886
887 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
888 return -EFAULT;
889
890 switch (status.stream) {
891 case SNDRV_RAWMIDI_STREAM_OUTPUT:
892 if (rfile->output == NULL)
893 return -EINVAL;
894 err = snd_rawmidi_output_status(rfile->output, &status);
895 break;
896 case SNDRV_RAWMIDI_STREAM_INPUT:
897 if (rfile->input == NULL)
898 return -EINVAL;
899 err = snd_rawmidi_input_status(rfile->input, &status);
900 break;
901 default:
902 return -EINVAL;
903 }
904 if (err < 0)
905 return err;
906 if (copy_to_user(argp, &status,
907 sizeof(struct snd_rawmidi_status64)))
908 return -EFAULT;
909 return 0;
910}
911
912static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
913{
914 struct snd_rawmidi_file *rfile;
915 struct snd_rawmidi *rmidi;
916 void __user *argp = (void __user *)arg;
917
918 rfile = file->private_data;
919 if (((cmd >> 8) & 0xff) != 'W')
920 return -ENOTTY;
921 switch (cmd) {
922 case SNDRV_RAWMIDI_IOCTL_PVERSION:
923 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
924 case SNDRV_RAWMIDI_IOCTL_INFO:
925 {
926 int stream;
927 struct snd_rawmidi_info __user *info = argp;
928
929 if (get_user(stream, &info->stream))
930 return -EFAULT;
931 switch (stream) {
932 case SNDRV_RAWMIDI_STREAM_INPUT:
933 return snd_rawmidi_info_user(rfile->input, info);
934 case SNDRV_RAWMIDI_STREAM_OUTPUT:
935 return snd_rawmidi_info_user(rfile->output, info);
936 default:
937 return -EINVAL;
938 }
939 }
940 case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
941 if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
942 return -EFAULT;
943 return 0;
944
945 case SNDRV_RAWMIDI_IOCTL_PARAMS:
946 {
947 struct snd_rawmidi_params params;
948
949 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
950 return -EFAULT;
951 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
952 params.mode = 0;
953 memset(params.reserved, 0, sizeof(params.reserved));
954 }
955 switch (params.stream) {
956 case SNDRV_RAWMIDI_STREAM_OUTPUT:
957 if (rfile->output == NULL)
958 return -EINVAL;
959 return snd_rawmidi_output_params(rfile->output, ¶ms);
960 case SNDRV_RAWMIDI_STREAM_INPUT:
961 if (rfile->input == NULL)
962 return -EINVAL;
963 return snd_rawmidi_input_params(rfile->input, ¶ms);
964 default:
965 return -EINVAL;
966 }
967 }
968 case SNDRV_RAWMIDI_IOCTL_STATUS32:
969 return snd_rawmidi_ioctl_status32(rfile, argp);
970 case SNDRV_RAWMIDI_IOCTL_STATUS64:
971 return snd_rawmidi_ioctl_status64(rfile, argp);
972 case SNDRV_RAWMIDI_IOCTL_DROP:
973 {
974 int val;
975
976 if (get_user(val, (int __user *) argp))
977 return -EFAULT;
978 switch (val) {
979 case SNDRV_RAWMIDI_STREAM_OUTPUT:
980 if (rfile->output == NULL)
981 return -EINVAL;
982 return snd_rawmidi_drop_output(rfile->output);
983 default:
984 return -EINVAL;
985 }
986 }
987 case SNDRV_RAWMIDI_IOCTL_DRAIN:
988 {
989 int val;
990
991 if (get_user(val, (int __user *) argp))
992 return -EFAULT;
993 switch (val) {
994 case SNDRV_RAWMIDI_STREAM_OUTPUT:
995 if (rfile->output == NULL)
996 return -EINVAL;
997 return snd_rawmidi_drain_output(rfile->output);
998 case SNDRV_RAWMIDI_STREAM_INPUT:
999 if (rfile->input == NULL)
1000 return -EINVAL;
1001 return snd_rawmidi_drain_input(rfile->input);
1002 default:
1003 return -EINVAL;
1004 }
1005 }
1006 default:
1007 rmidi = rfile->rmidi;
1008 if (rmidi->ops && rmidi->ops->ioctl)
1009 return rmidi->ops->ioctl(rmidi, cmd, argp);
1010 rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
1011 }
1012 return -ENOTTY;
1013}
1014
1015/* ioctl to find the next device; either legacy or UMP depending on @find_ump */
1016static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
1017 bool find_ump)
1018
1019{
1020 struct snd_rawmidi *rmidi;
1021 int device;
1022 bool is_ump;
1023
1024 if (get_user(device, argp))
1025 return -EFAULT;
1026 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1027 device = SNDRV_RAWMIDI_DEVICES - 1;
1028 mutex_lock(®ister_mutex);
1029 device = device < 0 ? 0 : device + 1;
1030 for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
1031 rmidi = snd_rawmidi_search(card, device);
1032 if (!rmidi)
1033 continue;
1034 is_ump = rawmidi_is_ump(rmidi);
1035 if (find_ump == is_ump)
1036 break;
1037 }
1038 if (device == SNDRV_RAWMIDI_DEVICES)
1039 device = -1;
1040 mutex_unlock(®ister_mutex);
1041 if (put_user(device, argp))
1042 return -EFAULT;
1043 return 0;
1044}
1045
1046#if IS_ENABLED(CONFIG_SND_UMP)
1047/* inquiry of UMP endpoint and block info via control API */
1048static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
1049 void __user *argp)
1050{
1051 struct snd_ump_endpoint_info __user *info = argp;
1052 struct snd_rawmidi *rmidi;
1053 int device, ret;
1054
1055 if (get_user(device, &info->device))
1056 return -EFAULT;
1057 mutex_lock(®ister_mutex);
1058 rmidi = snd_rawmidi_search(card, device);
1059 if (rmidi && rmidi->ops && rmidi->ops->ioctl)
1060 ret = rmidi->ops->ioctl(rmidi, cmd, argp);
1061 else
1062 ret = -ENXIO;
1063 mutex_unlock(®ister_mutex);
1064 return ret;
1065}
1066#endif
1067
1068static int snd_rawmidi_control_ioctl(struct snd_card *card,
1069 struct snd_ctl_file *control,
1070 unsigned int cmd,
1071 unsigned long arg)
1072{
1073 void __user *argp = (void __user *)arg;
1074
1075 switch (cmd) {
1076 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1077 return snd_rawmidi_next_device(card, argp, false);
1078#if IS_ENABLED(CONFIG_SND_UMP)
1079 case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
1080 return snd_rawmidi_next_device(card, argp, true);
1081 case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
1082 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
1083 case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
1084 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
1085#endif
1086 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1087 {
1088 int val;
1089
1090 if (get_user(val, (int __user *)argp))
1091 return -EFAULT;
1092 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1093 return 0;
1094 }
1095 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1096 return snd_rawmidi_info_select_user(card, argp);
1097 }
1098 return -ENOIOCTLCMD;
1099}
1100
1101static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1102 const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1103{
1104 struct snd_rawmidi_runtime *runtime = substream->runtime;
1105 struct snd_rawmidi_framing_tstamp *dest_ptr;
1106 struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1107 int orig_count = src_count;
1108 int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1109 int align = get_align(runtime);
1110
1111 BUILD_BUG_ON(frame_size != 0x20);
1112 if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1113 return -EINVAL;
1114
1115 while (src_count > align) {
1116 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1117 runtime->xruns += src_count;
1118 break;
1119 }
1120 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1121 frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1122 else {
1123 frame.length = get_aligned_size(runtime, src_count);
1124 if (!frame.length)
1125 break;
1126 memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1127 }
1128 memcpy(frame.data, buffer, frame.length);
1129 buffer += frame.length;
1130 src_count -= frame.length;
1131 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1132 *dest_ptr = frame;
1133 runtime->avail += frame_size;
1134 runtime->hw_ptr += frame_size;
1135 runtime->hw_ptr %= runtime->buffer_size;
1136 }
1137 return orig_count - src_count;
1138}
1139
1140static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1141{
1142 struct timespec64 ts64 = {0, 0};
1143
1144 switch (substream->clock_type) {
1145 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1146 ktime_get_raw_ts64(&ts64);
1147 break;
1148 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1149 ktime_get_ts64(&ts64);
1150 break;
1151 case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1152 ktime_get_real_ts64(&ts64);
1153 break;
1154 }
1155 return ts64;
1156}
1157
1158/**
1159 * snd_rawmidi_receive - receive the input data from the device
1160 * @substream: the rawmidi substream
1161 * @buffer: the buffer pointer
1162 * @count: the data size to read
1163 *
1164 * Reads the data from the internal buffer.
1165 *
1166 * Return: The size of read data, or a negative error code on failure.
1167 */
1168int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1169 const unsigned char *buffer, int count)
1170{
1171 unsigned long flags;
1172 struct timespec64 ts64 = get_framing_tstamp(substream);
1173 int result = 0, count1;
1174 struct snd_rawmidi_runtime *runtime;
1175
1176 spin_lock_irqsave(&substream->lock, flags);
1177 if (!substream->opened) {
1178 result = -EBADFD;
1179 goto unlock;
1180 }
1181 runtime = substream->runtime;
1182 if (!runtime || !runtime->buffer) {
1183 rmidi_dbg(substream->rmidi,
1184 "snd_rawmidi_receive: input is not active!!!\n");
1185 result = -EINVAL;
1186 goto unlock;
1187 }
1188
1189 count = get_aligned_size(runtime, count);
1190 if (!count)
1191 goto unlock;
1192
1193 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1194 result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1195 } else if (count == 1) { /* special case, faster code */
1196 substream->bytes++;
1197 if (runtime->avail < runtime->buffer_size) {
1198 runtime->buffer[runtime->hw_ptr++] = buffer[0];
1199 runtime->hw_ptr %= runtime->buffer_size;
1200 runtime->avail++;
1201 result++;
1202 } else {
1203 runtime->xruns++;
1204 }
1205 } else {
1206 substream->bytes += count;
1207 count1 = runtime->buffer_size - runtime->hw_ptr;
1208 if (count1 > count)
1209 count1 = count;
1210 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1211 count1 = runtime->buffer_size - runtime->avail;
1212 count1 = get_aligned_size(runtime, count1);
1213 if (!count1)
1214 goto unlock;
1215 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1216 runtime->hw_ptr += count1;
1217 runtime->hw_ptr %= runtime->buffer_size;
1218 runtime->avail += count1;
1219 count -= count1;
1220 result += count1;
1221 if (count > 0) {
1222 buffer += count1;
1223 count1 = count;
1224 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1225 count1 = runtime->buffer_size - runtime->avail;
1226 runtime->xruns += count - count1;
1227 }
1228 if (count1 > 0) {
1229 memcpy(runtime->buffer, buffer, count1);
1230 runtime->hw_ptr = count1;
1231 runtime->avail += count1;
1232 result += count1;
1233 }
1234 }
1235 }
1236 if (result > 0) {
1237 if (runtime->event)
1238 schedule_work(&runtime->event_work);
1239 else if (__snd_rawmidi_ready(runtime))
1240 wake_up(&runtime->sleep);
1241 }
1242 unlock:
1243 spin_unlock_irqrestore(&substream->lock, flags);
1244 return result;
1245}
1246EXPORT_SYMBOL(snd_rawmidi_receive);
1247
1248static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1249 unsigned char __user *userbuf,
1250 unsigned char *kernelbuf, long count)
1251{
1252 unsigned long flags;
1253 long result = 0, count1;
1254 struct snd_rawmidi_runtime *runtime = substream->runtime;
1255 unsigned long appl_ptr;
1256 int err = 0;
1257
1258 spin_lock_irqsave(&substream->lock, flags);
1259 snd_rawmidi_buffer_ref(runtime);
1260 while (count > 0 && runtime->avail) {
1261 count1 = runtime->buffer_size - runtime->appl_ptr;
1262 if (count1 > count)
1263 count1 = count;
1264 if (count1 > (int)runtime->avail)
1265 count1 = runtime->avail;
1266
1267 /* update runtime->appl_ptr before unlocking for userbuf */
1268 appl_ptr = runtime->appl_ptr;
1269 runtime->appl_ptr += count1;
1270 runtime->appl_ptr %= runtime->buffer_size;
1271 runtime->avail -= count1;
1272
1273 if (kernelbuf)
1274 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1275 if (userbuf) {
1276 spin_unlock_irqrestore(&substream->lock, flags);
1277 if (copy_to_user(userbuf + result,
1278 runtime->buffer + appl_ptr, count1))
1279 err = -EFAULT;
1280 spin_lock_irqsave(&substream->lock, flags);
1281 if (err)
1282 goto out;
1283 }
1284 result += count1;
1285 count -= count1;
1286 }
1287 out:
1288 snd_rawmidi_buffer_unref(runtime);
1289 spin_unlock_irqrestore(&substream->lock, flags);
1290 return result > 0 ? result : err;
1291}
1292
1293long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1294 unsigned char *buf, long count)
1295{
1296 snd_rawmidi_input_trigger(substream, 1);
1297 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1298}
1299EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1300
1301static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1302 loff_t *offset)
1303{
1304 long result;
1305 int count1;
1306 struct snd_rawmidi_file *rfile;
1307 struct snd_rawmidi_substream *substream;
1308 struct snd_rawmidi_runtime *runtime;
1309
1310 rfile = file->private_data;
1311 substream = rfile->input;
1312 if (substream == NULL)
1313 return -EIO;
1314 runtime = substream->runtime;
1315 snd_rawmidi_input_trigger(substream, 1);
1316 result = 0;
1317 while (count > 0) {
1318 spin_lock_irq(&substream->lock);
1319 while (!__snd_rawmidi_ready(runtime)) {
1320 wait_queue_entry_t wait;
1321
1322 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1323 spin_unlock_irq(&substream->lock);
1324 return result > 0 ? result : -EAGAIN;
1325 }
1326 init_waitqueue_entry(&wait, current);
1327 add_wait_queue(&runtime->sleep, &wait);
1328 set_current_state(TASK_INTERRUPTIBLE);
1329 spin_unlock_irq(&substream->lock);
1330 schedule();
1331 remove_wait_queue(&runtime->sleep, &wait);
1332 if (rfile->rmidi->card->shutdown)
1333 return -ENODEV;
1334 if (signal_pending(current))
1335 return result > 0 ? result : -ERESTARTSYS;
1336 spin_lock_irq(&substream->lock);
1337 if (!runtime->avail) {
1338 spin_unlock_irq(&substream->lock);
1339 return result > 0 ? result : -EIO;
1340 }
1341 }
1342 spin_unlock_irq(&substream->lock);
1343 count1 = snd_rawmidi_kernel_read1(substream,
1344 (unsigned char __user *)buf,
1345 NULL/*kernelbuf*/,
1346 count);
1347 if (count1 < 0)
1348 return result > 0 ? result : count1;
1349 result += count1;
1350 buf += count1;
1351 count -= count1;
1352 }
1353 return result;
1354}
1355
1356/**
1357 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1358 * @substream: the rawmidi substream
1359 *
1360 * Return: 1 if the internal output buffer is empty, 0 if not.
1361 */
1362int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1363{
1364 struct snd_rawmidi_runtime *runtime;
1365 int result;
1366 unsigned long flags;
1367
1368 spin_lock_irqsave(&substream->lock, flags);
1369 runtime = substream->runtime;
1370 if (!substream->opened || !runtime || !runtime->buffer) {
1371 rmidi_dbg(substream->rmidi,
1372 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1373 result = 1;
1374 } else {
1375 result = runtime->avail >= runtime->buffer_size;
1376 }
1377 spin_unlock_irqrestore(&substream->lock, flags);
1378 return result;
1379}
1380EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1381
1382/*
1383 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1384 * @substream: the rawmidi substream
1385 * @buffer: the buffer pointer
1386 * @count: data size to transfer
1387 *
1388 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1389 */
1390static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1391 unsigned char *buffer, int count)
1392{
1393 int result, count1;
1394 struct snd_rawmidi_runtime *runtime = substream->runtime;
1395
1396 if (runtime->buffer == NULL) {
1397 rmidi_dbg(substream->rmidi,
1398 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1399 return -EINVAL;
1400 }
1401 result = 0;
1402 if (runtime->avail >= runtime->buffer_size) {
1403 /* warning: lowlevel layer MUST trigger down the hardware */
1404 goto __skip;
1405 }
1406 if (count == 1) { /* special case, faster code */
1407 *buffer = runtime->buffer[runtime->hw_ptr];
1408 result++;
1409 } else {
1410 count1 = runtime->buffer_size - runtime->hw_ptr;
1411 if (count1 > count)
1412 count1 = count;
1413 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1414 count1 = runtime->buffer_size - runtime->avail;
1415 count1 = get_aligned_size(runtime, count1);
1416 if (!count1)
1417 goto __skip;
1418 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1419 count -= count1;
1420 result += count1;
1421 if (count > 0) {
1422 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1423 count = runtime->buffer_size - runtime->avail - count1;
1424 count = get_aligned_size(runtime, count);
1425 if (!count)
1426 goto __skip;
1427 memcpy(buffer + count1, runtime->buffer, count);
1428 result += count;
1429 }
1430 }
1431 __skip:
1432 return result;
1433}
1434
1435/**
1436 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1437 * @substream: the rawmidi substream
1438 * @buffer: the buffer pointer
1439 * @count: data size to transfer
1440 *
1441 * Copies data from the internal output buffer to the given buffer.
1442 *
1443 * Call this in the interrupt handler when the midi output is ready,
1444 * and call snd_rawmidi_transmit_ack() after the transmission is
1445 * finished.
1446 *
1447 * Return: The size of copied data, or a negative error code on failure.
1448 */
1449int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1450 unsigned char *buffer, int count)
1451{
1452 int result;
1453 unsigned long flags;
1454
1455 spin_lock_irqsave(&substream->lock, flags);
1456 if (!substream->opened || !substream->runtime)
1457 result = -EBADFD;
1458 else
1459 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1460 spin_unlock_irqrestore(&substream->lock, flags);
1461 return result;
1462}
1463EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1464
1465/*
1466 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1467 * @substream: the rawmidi substream
1468 * @count: the transferred count
1469 *
1470 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1471 */
1472static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1473 int count)
1474{
1475 struct snd_rawmidi_runtime *runtime = substream->runtime;
1476
1477 if (runtime->buffer == NULL) {
1478 rmidi_dbg(substream->rmidi,
1479 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1480 return -EINVAL;
1481 }
1482 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1483 count = get_aligned_size(runtime, count);
1484 runtime->hw_ptr += count;
1485 runtime->hw_ptr %= runtime->buffer_size;
1486 runtime->avail += count;
1487 substream->bytes += count;
1488 if (count > 0) {
1489 if (runtime->drain || __snd_rawmidi_ready(runtime))
1490 wake_up(&runtime->sleep);
1491 }
1492 return count;
1493}
1494
1495/**
1496 * snd_rawmidi_transmit_ack - acknowledge the transmission
1497 * @substream: the rawmidi substream
1498 * @count: the transferred count
1499 *
1500 * Advances the hardware pointer for the internal output buffer with
1501 * the given size and updates the condition.
1502 * Call after the transmission is finished.
1503 *
1504 * Return: The advanced size if successful, or a negative error code on failure.
1505 */
1506int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1507{
1508 int result;
1509 unsigned long flags;
1510
1511 spin_lock_irqsave(&substream->lock, flags);
1512 if (!substream->opened || !substream->runtime)
1513 result = -EBADFD;
1514 else
1515 result = __snd_rawmidi_transmit_ack(substream, count);
1516 spin_unlock_irqrestore(&substream->lock, flags);
1517 return result;
1518}
1519EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1520
1521/**
1522 * snd_rawmidi_transmit - copy from the buffer to the device
1523 * @substream: the rawmidi substream
1524 * @buffer: the buffer pointer
1525 * @count: the data size to transfer
1526 *
1527 * Copies data from the buffer to the device and advances the pointer.
1528 *
1529 * Return: The copied size if successful, or a negative error code on failure.
1530 */
1531int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1532 unsigned char *buffer, int count)
1533{
1534 int result;
1535 unsigned long flags;
1536
1537 spin_lock_irqsave(&substream->lock, flags);
1538 if (!substream->opened)
1539 result = -EBADFD;
1540 else {
1541 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1542 if (count <= 0)
1543 result = count;
1544 else
1545 result = __snd_rawmidi_transmit_ack(substream, count);
1546 }
1547 spin_unlock_irqrestore(&substream->lock, flags);
1548 return result;
1549}
1550EXPORT_SYMBOL(snd_rawmidi_transmit);
1551
1552/**
1553 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1554 * @substream: rawmidi substream
1555 *
1556 * Return: the number of discarded bytes
1557 */
1558int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1559{
1560 struct snd_rawmidi_runtime *runtime;
1561 unsigned long flags;
1562 int count = 0;
1563
1564 spin_lock_irqsave(&substream->lock, flags);
1565 runtime = substream->runtime;
1566 if (substream->opened && runtime &&
1567 runtime->avail < runtime->buffer_size) {
1568 count = runtime->buffer_size - runtime->avail;
1569 __snd_rawmidi_transmit_ack(substream, count);
1570 }
1571 spin_unlock_irqrestore(&substream->lock, flags);
1572 return count;
1573}
1574EXPORT_SYMBOL(snd_rawmidi_proceed);
1575
1576static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1577 const unsigned char __user *userbuf,
1578 const unsigned char *kernelbuf,
1579 long count)
1580{
1581 unsigned long flags;
1582 long count1, result;
1583 struct snd_rawmidi_runtime *runtime = substream->runtime;
1584 unsigned long appl_ptr;
1585
1586 if (!kernelbuf && !userbuf)
1587 return -EINVAL;
1588 if (snd_BUG_ON(!runtime->buffer))
1589 return -EINVAL;
1590
1591 result = 0;
1592 spin_lock_irqsave(&substream->lock, flags);
1593 if (substream->append) {
1594 if ((long)runtime->avail < count) {
1595 spin_unlock_irqrestore(&substream->lock, flags);
1596 return -EAGAIN;
1597 }
1598 }
1599 snd_rawmidi_buffer_ref(runtime);
1600 while (count > 0 && runtime->avail > 0) {
1601 count1 = runtime->buffer_size - runtime->appl_ptr;
1602 if (count1 > count)
1603 count1 = count;
1604 if (count1 > (long)runtime->avail)
1605 count1 = runtime->avail;
1606
1607 /* update runtime->appl_ptr before unlocking for userbuf */
1608 appl_ptr = runtime->appl_ptr;
1609 runtime->appl_ptr += count1;
1610 runtime->appl_ptr %= runtime->buffer_size;
1611 runtime->avail -= count1;
1612
1613 if (kernelbuf)
1614 memcpy(runtime->buffer + appl_ptr,
1615 kernelbuf + result, count1);
1616 else if (userbuf) {
1617 spin_unlock_irqrestore(&substream->lock, flags);
1618 if (copy_from_user(runtime->buffer + appl_ptr,
1619 userbuf + result, count1)) {
1620 spin_lock_irqsave(&substream->lock, flags);
1621 result = result > 0 ? result : -EFAULT;
1622 goto __end;
1623 }
1624 spin_lock_irqsave(&substream->lock, flags);
1625 }
1626 result += count1;
1627 count -= count1;
1628 }
1629 __end:
1630 count1 = runtime->avail < runtime->buffer_size;
1631 snd_rawmidi_buffer_unref(runtime);
1632 spin_unlock_irqrestore(&substream->lock, flags);
1633 if (count1)
1634 snd_rawmidi_output_trigger(substream, 1);
1635 return result;
1636}
1637
1638long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1639 const unsigned char *buf, long count)
1640{
1641 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1642}
1643EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1644
1645static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1646 size_t count, loff_t *offset)
1647{
1648 long result, timeout;
1649 int count1;
1650 struct snd_rawmidi_file *rfile;
1651 struct snd_rawmidi_runtime *runtime;
1652 struct snd_rawmidi_substream *substream;
1653
1654 rfile = file->private_data;
1655 substream = rfile->output;
1656 runtime = substream->runtime;
1657 /* we cannot put an atomic message to our buffer */
1658 if (substream->append && count > runtime->buffer_size)
1659 return -EIO;
1660 result = 0;
1661 while (count > 0) {
1662 spin_lock_irq(&substream->lock);
1663 while (!snd_rawmidi_ready_append(substream, count)) {
1664 wait_queue_entry_t wait;
1665
1666 if (file->f_flags & O_NONBLOCK) {
1667 spin_unlock_irq(&substream->lock);
1668 return result > 0 ? result : -EAGAIN;
1669 }
1670 init_waitqueue_entry(&wait, current);
1671 add_wait_queue(&runtime->sleep, &wait);
1672 set_current_state(TASK_INTERRUPTIBLE);
1673 spin_unlock_irq(&substream->lock);
1674 timeout = schedule_timeout(30 * HZ);
1675 remove_wait_queue(&runtime->sleep, &wait);
1676 if (rfile->rmidi->card->shutdown)
1677 return -ENODEV;
1678 if (signal_pending(current))
1679 return result > 0 ? result : -ERESTARTSYS;
1680 spin_lock_irq(&substream->lock);
1681 if (!runtime->avail && !timeout) {
1682 spin_unlock_irq(&substream->lock);
1683 return result > 0 ? result : -EIO;
1684 }
1685 }
1686 spin_unlock_irq(&substream->lock);
1687 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1688 if (count1 < 0)
1689 return result > 0 ? result : count1;
1690 result += count1;
1691 buf += count1;
1692 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1693 break;
1694 count -= count1;
1695 }
1696 if (file->f_flags & O_DSYNC) {
1697 spin_lock_irq(&substream->lock);
1698 while (runtime->avail != runtime->buffer_size) {
1699 wait_queue_entry_t wait;
1700 unsigned int last_avail = runtime->avail;
1701
1702 init_waitqueue_entry(&wait, current);
1703 add_wait_queue(&runtime->sleep, &wait);
1704 set_current_state(TASK_INTERRUPTIBLE);
1705 spin_unlock_irq(&substream->lock);
1706 timeout = schedule_timeout(30 * HZ);
1707 remove_wait_queue(&runtime->sleep, &wait);
1708 if (signal_pending(current))
1709 return result > 0 ? result : -ERESTARTSYS;
1710 if (runtime->avail == last_avail && !timeout)
1711 return result > 0 ? result : -EIO;
1712 spin_lock_irq(&substream->lock);
1713 }
1714 spin_unlock_irq(&substream->lock);
1715 }
1716 return result;
1717}
1718
1719static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1720{
1721 struct snd_rawmidi_file *rfile;
1722 struct snd_rawmidi_runtime *runtime;
1723 __poll_t mask;
1724
1725 rfile = file->private_data;
1726 if (rfile->input != NULL) {
1727 runtime = rfile->input->runtime;
1728 snd_rawmidi_input_trigger(rfile->input, 1);
1729 poll_wait(file, &runtime->sleep, wait);
1730 }
1731 if (rfile->output != NULL) {
1732 runtime = rfile->output->runtime;
1733 poll_wait(file, &runtime->sleep, wait);
1734 }
1735 mask = 0;
1736 if (rfile->input != NULL) {
1737 if (snd_rawmidi_ready(rfile->input))
1738 mask |= EPOLLIN | EPOLLRDNORM;
1739 }
1740 if (rfile->output != NULL) {
1741 if (snd_rawmidi_ready(rfile->output))
1742 mask |= EPOLLOUT | EPOLLWRNORM;
1743 }
1744 return mask;
1745}
1746
1747/*
1748 */
1749#ifdef CONFIG_COMPAT
1750#include "rawmidi_compat.c"
1751#else
1752#define snd_rawmidi_ioctl_compat NULL
1753#endif
1754
1755/*
1756 */
1757
1758static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1759 struct snd_info_buffer *buffer)
1760{
1761 struct snd_rawmidi *rmidi;
1762 struct snd_rawmidi_substream *substream;
1763 struct snd_rawmidi_runtime *runtime;
1764 unsigned long buffer_size, avail, xruns;
1765 unsigned int clock_type;
1766 static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1767
1768 rmidi = entry->private_data;
1769 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1770 if (IS_ENABLED(CONFIG_SND_UMP))
1771 snd_iprintf(buffer, "Type: %s\n",
1772 rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
1773 if (rmidi->ops && rmidi->ops->proc_read)
1774 rmidi->ops->proc_read(entry, buffer);
1775 mutex_lock(&rmidi->open_mutex);
1776 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1777 list_for_each_entry(substream,
1778 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1779 list) {
1780 snd_iprintf(buffer,
1781 "Output %d\n"
1782 " Tx bytes : %lu\n",
1783 substream->number,
1784 (unsigned long) substream->bytes);
1785 if (substream->opened) {
1786 snd_iprintf(buffer,
1787 " Owner PID : %d\n",
1788 pid_vnr(substream->pid));
1789 runtime = substream->runtime;
1790 spin_lock_irq(&substream->lock);
1791 buffer_size = runtime->buffer_size;
1792 avail = runtime->avail;
1793 spin_unlock_irq(&substream->lock);
1794 snd_iprintf(buffer,
1795 " Mode : %s\n"
1796 " Buffer size : %lu\n"
1797 " Avail : %lu\n",
1798 runtime->oss ? "OSS compatible" : "native",
1799 buffer_size, avail);
1800 }
1801 }
1802 }
1803 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1804 list_for_each_entry(substream,
1805 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1806 list) {
1807 snd_iprintf(buffer,
1808 "Input %d\n"
1809 " Rx bytes : %lu\n",
1810 substream->number,
1811 (unsigned long) substream->bytes);
1812 if (substream->opened) {
1813 snd_iprintf(buffer,
1814 " Owner PID : %d\n",
1815 pid_vnr(substream->pid));
1816 runtime = substream->runtime;
1817 spin_lock_irq(&substream->lock);
1818 buffer_size = runtime->buffer_size;
1819 avail = runtime->avail;
1820 xruns = runtime->xruns;
1821 spin_unlock_irq(&substream->lock);
1822 snd_iprintf(buffer,
1823 " Buffer size : %lu\n"
1824 " Avail : %lu\n"
1825 " Overruns : %lu\n",
1826 buffer_size, avail, xruns);
1827 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1828 clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1829 if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1830 snd_iprintf(buffer,
1831 " Framing : tstamp\n"
1832 " Clock type : %s\n",
1833 clock_names[clock_type]);
1834 }
1835 }
1836 }
1837 }
1838 mutex_unlock(&rmidi->open_mutex);
1839}
1840
1841/*
1842 * Register functions
1843 */
1844
1845static const struct file_operations snd_rawmidi_f_ops = {
1846 .owner = THIS_MODULE,
1847 .read = snd_rawmidi_read,
1848 .write = snd_rawmidi_write,
1849 .open = snd_rawmidi_open,
1850 .release = snd_rawmidi_release,
1851 .llseek = no_llseek,
1852 .poll = snd_rawmidi_poll,
1853 .unlocked_ioctl = snd_rawmidi_ioctl,
1854 .compat_ioctl = snd_rawmidi_ioctl_compat,
1855};
1856
1857static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1858 struct snd_rawmidi_str *stream,
1859 int direction,
1860 int count)
1861{
1862 struct snd_rawmidi_substream *substream;
1863 int idx;
1864
1865 for (idx = 0; idx < count; idx++) {
1866 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1867 if (!substream)
1868 return -ENOMEM;
1869 substream->stream = direction;
1870 substream->number = idx;
1871 substream->rmidi = rmidi;
1872 substream->pstr = stream;
1873 spin_lock_init(&substream->lock);
1874 list_add_tail(&substream->list, &stream->substreams);
1875 stream->substream_count++;
1876 }
1877 return 0;
1878}
1879
1880/* used for both rawmidi and ump */
1881int snd_rawmidi_init(struct snd_rawmidi *rmidi,
1882 struct snd_card *card, char *id, int device,
1883 int output_count, int input_count,
1884 unsigned int info_flags)
1885{
1886 int err;
1887 static const struct snd_device_ops ops = {
1888 .dev_free = snd_rawmidi_dev_free,
1889 .dev_register = snd_rawmidi_dev_register,
1890 .dev_disconnect = snd_rawmidi_dev_disconnect,
1891 };
1892
1893 rmidi->card = card;
1894 rmidi->device = device;
1895 mutex_init(&rmidi->open_mutex);
1896 init_waitqueue_head(&rmidi->open_wait);
1897 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1898 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1899 rmidi->info_flags = info_flags;
1900
1901 if (id != NULL)
1902 strscpy(rmidi->id, id, sizeof(rmidi->id));
1903
1904 err = snd_device_alloc(&rmidi->dev, card);
1905 if (err < 0)
1906 return err;
1907 if (rawmidi_is_ump(rmidi))
1908 dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);
1909 else
1910 dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);
1911
1912 err = snd_rawmidi_alloc_substreams(rmidi,
1913 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1914 SNDRV_RAWMIDI_STREAM_INPUT,
1915 input_count);
1916 if (err < 0)
1917 return err;
1918 err = snd_rawmidi_alloc_substreams(rmidi,
1919 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1920 SNDRV_RAWMIDI_STREAM_OUTPUT,
1921 output_count);
1922 if (err < 0)
1923 return err;
1924 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1925 if (err < 0)
1926 return err;
1927 return 0;
1928}
1929EXPORT_SYMBOL_GPL(snd_rawmidi_init);
1930
1931/**
1932 * snd_rawmidi_new - create a rawmidi instance
1933 * @card: the card instance
1934 * @id: the id string
1935 * @device: the device index
1936 * @output_count: the number of output streams
1937 * @input_count: the number of input streams
1938 * @rrawmidi: the pointer to store the new rawmidi instance
1939 *
1940 * Creates a new rawmidi instance.
1941 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1942 *
1943 * Return: Zero if successful, or a negative error code on failure.
1944 */
1945int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1946 int output_count, int input_count,
1947 struct snd_rawmidi **rrawmidi)
1948{
1949 struct snd_rawmidi *rmidi;
1950 int err;
1951
1952 if (rrawmidi)
1953 *rrawmidi = NULL;
1954 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1955 if (!rmidi)
1956 return -ENOMEM;
1957 err = snd_rawmidi_init(rmidi, card, id, device,
1958 output_count, input_count, 0);
1959 if (err < 0) {
1960 snd_rawmidi_free(rmidi);
1961 return err;
1962 }
1963 if (rrawmidi)
1964 *rrawmidi = rmidi;
1965 return 0;
1966}
1967EXPORT_SYMBOL(snd_rawmidi_new);
1968
1969static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1970{
1971 struct snd_rawmidi_substream *substream;
1972
1973 while (!list_empty(&stream->substreams)) {
1974 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1975 list_del(&substream->list);
1976 kfree(substream);
1977 }
1978}
1979
1980/* called from ump.c, too */
1981int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1982{
1983 if (!rmidi)
1984 return 0;
1985
1986 snd_info_free_entry(rmidi->proc_entry);
1987 rmidi->proc_entry = NULL;
1988 if (rmidi->ops && rmidi->ops->dev_unregister)
1989 rmidi->ops->dev_unregister(rmidi);
1990
1991 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1992 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1993 if (rmidi->private_free)
1994 rmidi->private_free(rmidi);
1995 put_device(rmidi->dev);
1996 kfree(rmidi);
1997 return 0;
1998}
1999EXPORT_SYMBOL_GPL(snd_rawmidi_free);
2000
2001static int snd_rawmidi_dev_free(struct snd_device *device)
2002{
2003 struct snd_rawmidi *rmidi = device->device_data;
2004
2005 return snd_rawmidi_free(rmidi);
2006}
2007
2008#if IS_ENABLED(CONFIG_SND_SEQUENCER)
2009static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
2010{
2011 struct snd_rawmidi *rmidi = device->private_data;
2012
2013 rmidi->seq_dev = NULL;
2014}
2015#endif
2016
2017static int snd_rawmidi_dev_register(struct snd_device *device)
2018{
2019 int err;
2020 struct snd_info_entry *entry;
2021 char name[16];
2022 struct snd_rawmidi *rmidi = device->device_data;
2023
2024 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
2025 return -ENOMEM;
2026 err = 0;
2027 mutex_lock(®ister_mutex);
2028 if (snd_rawmidi_search(rmidi->card, rmidi->device))
2029 err = -EBUSY;
2030 else
2031 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
2032 mutex_unlock(®ister_mutex);
2033 if (err < 0)
2034 return err;
2035
2036 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
2037 rmidi->card, rmidi->device,
2038 &snd_rawmidi_f_ops, rmidi, rmidi->dev);
2039 if (err < 0) {
2040 rmidi_err(rmidi, "unable to register\n");
2041 goto error;
2042 }
2043 if (rmidi->ops && rmidi->ops->dev_register) {
2044 err = rmidi->ops->dev_register(rmidi);
2045 if (err < 0)
2046 goto error_unregister;
2047 }
2048#ifdef CONFIG_SND_OSSEMUL
2049 rmidi->ossreg = 0;
2050 if (!rawmidi_is_ump(rmidi) &&
2051 (int)rmidi->device == midi_map[rmidi->card->number]) {
2052 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2053 rmidi->card, 0, &snd_rawmidi_f_ops,
2054 rmidi) < 0) {
2055 rmidi_err(rmidi,
2056 "unable to register OSS rawmidi device %i:%i\n",
2057 rmidi->card->number, 0);
2058 } else {
2059 rmidi->ossreg++;
2060#ifdef SNDRV_OSS_INFO_DEV_MIDI
2061 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
2062#endif
2063 }
2064 }
2065 if (!rawmidi_is_ump(rmidi) &&
2066 (int)rmidi->device == amidi_map[rmidi->card->number]) {
2067 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2068 rmidi->card, 1, &snd_rawmidi_f_ops,
2069 rmidi) < 0) {
2070 rmidi_err(rmidi,
2071 "unable to register OSS rawmidi device %i:%i\n",
2072 rmidi->card->number, 1);
2073 } else {
2074 rmidi->ossreg++;
2075 }
2076 }
2077#endif /* CONFIG_SND_OSSEMUL */
2078 sprintf(name, "midi%d", rmidi->device);
2079 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
2080 if (entry) {
2081 entry->private_data = rmidi;
2082 entry->c.text.read = snd_rawmidi_proc_info_read;
2083 if (snd_info_register(entry) < 0) {
2084 snd_info_free_entry(entry);
2085 entry = NULL;
2086 }
2087 }
2088 rmidi->proc_entry = entry;
2089#if IS_ENABLED(CONFIG_SND_SEQUENCER)
2090 /* no own registration mechanism? */
2091 if (!rmidi->ops || !rmidi->ops->dev_register) {
2092 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2093 rmidi->seq_dev->private_data = rmidi;
2094 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2095 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2096 snd_device_register(rmidi->card, rmidi->seq_dev);
2097 }
2098 }
2099#endif
2100 return 0;
2101
2102 error_unregister:
2103 snd_unregister_device(rmidi->dev);
2104 error:
2105 mutex_lock(®ister_mutex);
2106 list_del(&rmidi->list);
2107 mutex_unlock(®ister_mutex);
2108 return err;
2109}
2110
2111static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2112{
2113 struct snd_rawmidi *rmidi = device->device_data;
2114 int dir;
2115
2116 mutex_lock(®ister_mutex);
2117 mutex_lock(&rmidi->open_mutex);
2118 wake_up(&rmidi->open_wait);
2119 list_del_init(&rmidi->list);
2120 for (dir = 0; dir < 2; dir++) {
2121 struct snd_rawmidi_substream *s;
2122
2123 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2124 if (s->runtime)
2125 wake_up(&s->runtime->sleep);
2126 }
2127 }
2128
2129#ifdef CONFIG_SND_OSSEMUL
2130 if (rmidi->ossreg) {
2131 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2132 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2133#ifdef SNDRV_OSS_INFO_DEV_MIDI
2134 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2135#endif
2136 }
2137 if ((int)rmidi->device == amidi_map[rmidi->card->number])
2138 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2139 rmidi->ossreg = 0;
2140 }
2141#endif /* CONFIG_SND_OSSEMUL */
2142 snd_unregister_device(rmidi->dev);
2143 mutex_unlock(&rmidi->open_mutex);
2144 mutex_unlock(®ister_mutex);
2145 return 0;
2146}
2147
2148/**
2149 * snd_rawmidi_set_ops - set the rawmidi operators
2150 * @rmidi: the rawmidi instance
2151 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2152 * @ops: the operator table
2153 *
2154 * Sets the rawmidi operators for the given stream direction.
2155 */
2156void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2157 const struct snd_rawmidi_ops *ops)
2158{
2159 struct snd_rawmidi_substream *substream;
2160
2161 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2162 substream->ops = ops;
2163}
2164EXPORT_SYMBOL(snd_rawmidi_set_ops);
2165
2166/*
2167 * ENTRY functions
2168 */
2169
2170static int __init alsa_rawmidi_init(void)
2171{
2172
2173 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2174 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2175#ifdef CONFIG_SND_OSSEMUL
2176 { int i;
2177 /* check device map table */
2178 for (i = 0; i < SNDRV_CARDS; i++) {
2179 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2180 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2181 i, midi_map[i]);
2182 midi_map[i] = 0;
2183 }
2184 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2185 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2186 i, amidi_map[i]);
2187 amidi_map[i] = 1;
2188 }
2189 }
2190 }
2191#endif /* CONFIG_SND_OSSEMUL */
2192 return 0;
2193}
2194
2195static void __exit alsa_rawmidi_exit(void)
2196{
2197 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2198 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2199}
2200
2201module_init(alsa_rawmidi_init)
2202module_exit(alsa_rawmidi_exit)