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