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Linux 4.16.11
[linux/fpc-iii.git] / sound / core / rawmidi.c
blob69616d00481c2cdff6331d8406bb18550db7824d
1 /*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/core.h>
23 #include <linux/major.h>
24 #include <linux/init.h>
25 #include <linux/sched/signal.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/mutex.h>
30 #include <linux/module.h>
31 #include <linux/delay.h>
32 #include <sound/rawmidi.h>
33 #include <sound/info.h>
34 #include <sound/control.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40 MODULE_LICENSE("GPL");
41
42 #ifdef CONFIG_SND_OSSEMUL
43 static int midi_map[SNDRV_CARDS];
44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45 module_param_array(midi_map, int, NULL, 0444);
46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47 module_param_array(amidi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49 #endif /* CONFIG_SND_OSSEMUL */
50
51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52 static int snd_rawmidi_dev_free(struct snd_device *device);
53 static int snd_rawmidi_dev_register(struct snd_device *device);
54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56 static LIST_HEAD(snd_rawmidi_devices);
57 static DEFINE_MUTEX(register_mutex);
58
59 #define rmidi_err(rmidi, fmt, args...) \
60 dev_err(&(rmidi)->dev, fmt, ##args)
61 #define rmidi_warn(rmidi, fmt, args...) \
62 dev_warn(&(rmidi)->dev, fmt, ##args)
63 #define rmidi_dbg(rmidi, fmt, args...) \
64 dev_dbg(&(rmidi)->dev, fmt, ##args)
65
66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
67 {
68 struct snd_rawmidi *rawmidi;
69
70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
71 if (rawmidi->card == card && rawmidi->device == device)
72 return rawmidi;
73 return NULL;
74 }
75
76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
77 {
78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
79 case FMODE_WRITE:
80 return SNDRV_RAWMIDI_LFLG_OUTPUT;
81 case FMODE_READ:
82 return SNDRV_RAWMIDI_LFLG_INPUT;
83 default:
84 return SNDRV_RAWMIDI_LFLG_OPEN;
85 }
86 }
87
88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
89 {
90 struct snd_rawmidi_runtime *runtime = substream->runtime;
91 return runtime->avail >= runtime->avail_min;
92 }
93
94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
95 size_t count)
96 {
97 struct snd_rawmidi_runtime *runtime = substream->runtime;
98 return runtime->avail >= runtime->avail_min &&
99 (!substream->append || runtime->avail >= count);
100 }
101
102 static void snd_rawmidi_input_event_work(struct work_struct *work)
103 {
104 struct snd_rawmidi_runtime *runtime =
105 container_of(work, struct snd_rawmidi_runtime, event_work);
106 if (runtime->event)
107 runtime->event(runtime->substream);
108 }
109
110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
111 {
112 struct snd_rawmidi_runtime *runtime;
113
114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
115 return -ENOMEM;
116 runtime->substream = substream;
117 spin_lock_init(&runtime->lock);
118 init_waitqueue_head(&runtime->sleep);
119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
120 runtime->event = NULL;
121 runtime->buffer_size = PAGE_SIZE;
122 runtime->avail_min = 1;
123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
124 runtime->avail = 0;
125 else
126 runtime->avail = runtime->buffer_size;
127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
128 kfree(runtime);
129 return -ENOMEM;
130 }
131 runtime->appl_ptr = runtime->hw_ptr = 0;
132 substream->runtime = runtime;
133 return 0;
134 }
135
136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
137 {
138 struct snd_rawmidi_runtime *runtime = substream->runtime;
139
140 kfree(runtime->buffer);
141 kfree(runtime);
142 substream->runtime = NULL;
143 return 0;
144 }
145
146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
147 {
148 if (!substream->opened)
149 return;
150 substream->ops->trigger(substream, up);
151 }
152
153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155 if (!substream->opened)
156 return;
157 substream->ops->trigger(substream, up);
158 if (!up)
159 cancel_work_sync(&substream->runtime->event_work);
160 }
161
162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
163 {
164 unsigned long flags;
165 struct snd_rawmidi_runtime *runtime = substream->runtime;
166
167 snd_rawmidi_output_trigger(substream, 0);
168 runtime->drain = 0;
169 spin_lock_irqsave(&runtime->lock, flags);
170 runtime->appl_ptr = runtime->hw_ptr = 0;
171 runtime->avail = runtime->buffer_size;
172 spin_unlock_irqrestore(&runtime->lock, flags);
173 return 0;
174 }
175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
178 {
179 int err;
180 long timeout;
181 struct snd_rawmidi_runtime *runtime = substream->runtime;
182
183 err = 0;
184 runtime->drain = 1;
185 timeout = wait_event_interruptible_timeout(runtime->sleep,
186 (runtime->avail >= runtime->buffer_size),
187 10*HZ);
188 if (signal_pending(current))
189 err = -ERESTARTSYS;
190 if (runtime->avail < runtime->buffer_size && !timeout) {
191 rmidi_warn(substream->rmidi,
192 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
193 (long)runtime->avail, (long)runtime->buffer_size);
194 err = -EIO;
195 }
196 runtime->drain = 0;
197 if (err != -ERESTARTSYS) {
198 /* we need wait a while to make sure that Tx FIFOs are empty */
199 if (substream->ops->drain)
200 substream->ops->drain(substream);
201 else
202 msleep(50);
203 snd_rawmidi_drop_output(substream);
204 }
205 return err;
206 }
207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210 {
211 unsigned long flags;
212 struct snd_rawmidi_runtime *runtime = substream->runtime;
213
214 snd_rawmidi_input_trigger(substream, 0);
215 runtime->drain = 0;
216 spin_lock_irqsave(&runtime->lock, flags);
217 runtime->appl_ptr = runtime->hw_ptr = 0;
218 runtime->avail = 0;
219 spin_unlock_irqrestore(&runtime->lock, flags);
220 return 0;
221 }
222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
223
224 /* look for an available substream for the given stream direction;
225 * if a specific subdevice is given, try to assign it
226 */
227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
228 int stream, int mode,
229 struct snd_rawmidi_substream **sub_ret)
230 {
231 struct snd_rawmidi_substream *substream;
232 struct snd_rawmidi_str *s = &rmidi->streams[stream];
233 static unsigned int info_flags[2] = {
234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
236 };
237
238 if (!(rmidi->info_flags & info_flags[stream]))
239 return -ENXIO;
240 if (subdevice >= 0 && subdevice >= s->substream_count)
241 return -ENODEV;
242
243 list_for_each_entry(substream, &s->substreams, list) {
244 if (substream->opened) {
245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
247 !substream->append)
248 continue;
249 }
250 if (subdevice < 0 || subdevice == substream->number) {
251 *sub_ret = substream;
252 return 0;
253 }
254 }
255 return -EAGAIN;
256 }
257
258 /* open and do ref-counting for the given substream */
259 static int open_substream(struct snd_rawmidi *rmidi,
260 struct snd_rawmidi_substream *substream,
261 int mode)
262 {
263 int err;
264
265 if (substream->use_count == 0) {
266 err = snd_rawmidi_runtime_create(substream);
267 if (err < 0)
268 return err;
269 err = substream->ops->open(substream);
270 if (err < 0) {
271 snd_rawmidi_runtime_free(substream);
272 return err;
273 }
274 substream->opened = 1;
275 substream->active_sensing = 0;
276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
277 substream->append = 1;
278 substream->pid = get_pid(task_pid(current));
279 rmidi->streams[substream->stream].substream_opened++;
280 }
281 substream->use_count++;
282 return 0;
283 }
284
285 static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
290 struct snd_rawmidi_file *rfile)
291 {
292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
293 int err;
294
295 rfile->input = rfile->output = NULL;
296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
297 err = assign_substream(rmidi, subdevice,
298 SNDRV_RAWMIDI_STREAM_INPUT,
299 mode, &sinput);
300 if (err < 0)
301 return err;
302 }
303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
304 err = assign_substream(rmidi, subdevice,
305 SNDRV_RAWMIDI_STREAM_OUTPUT,
306 mode, &soutput);
307 if (err < 0)
308 return err;
309 }
310
311 if (sinput) {
312 err = open_substream(rmidi, sinput, mode);
313 if (err < 0)
314 return err;
315 }
316 if (soutput) {
317 err = open_substream(rmidi, soutput, mode);
318 if (err < 0) {
319 if (sinput)
320 close_substream(rmidi, sinput, 0);
321 return err;
322 }
323 }
324
325 rfile->rmidi = rmidi;
326 rfile->input = sinput;
327 rfile->output = soutput;
328 return 0;
329 }
330
331 /* called from sound/core/seq/seq_midi.c */
332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
333 int mode, struct snd_rawmidi_file * rfile)
334 {
335 struct snd_rawmidi *rmidi;
336 int err;
337
338 if (snd_BUG_ON(!rfile))
339 return -EINVAL;
340
341 mutex_lock(&register_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(&register_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(&register_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(&register_mutex);
352
353 mutex_lock(&rmidi->open_mutex);
354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
355 mutex_unlock(&rmidi->open_mutex);
356 if (err < 0)
357 module_put(rmidi->card->module);
358 return err;
359 }
360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
363 {
364 int maj = imajor(inode);
365 struct snd_card *card;
366 int subdevice;
367 unsigned short fflags;
368 int err;
369 struct snd_rawmidi *rmidi;
370 struct snd_rawmidi_file *rawmidi_file = NULL;
371 wait_queue_entry_t wait;
372
373 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
374 return -EINVAL; /* invalid combination */
375
376 err = nonseekable_open(inode, file);
377 if (err < 0)
378 return err;
379
380 if (maj == snd_major) {
381 rmidi = snd_lookup_minor_data(iminor(inode),
382 SNDRV_DEVICE_TYPE_RAWMIDI);
383 #ifdef CONFIG_SND_OSSEMUL
384 } else if (maj == SOUND_MAJOR) {
385 rmidi = snd_lookup_oss_minor_data(iminor(inode),
386 SNDRV_OSS_DEVICE_TYPE_MIDI);
387 #endif
388 } else
389 return -ENXIO;
390
391 if (rmidi == NULL)
392 return -ENODEV;
393
394 if (!try_module_get(rmidi->card->module)) {
395 snd_card_unref(rmidi->card);
396 return -ENXIO;
397 }
398
399 mutex_lock(&rmidi->open_mutex);
400 card = rmidi->card;
401 err = snd_card_file_add(card, file);
402 if (err < 0)
403 goto __error_card;
404 fflags = snd_rawmidi_file_flags(file);
405 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
406 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
407 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
408 if (rawmidi_file == NULL) {
409 err = -ENOMEM;
410 goto __error;
411 }
412 init_waitqueue_entry(&wait, current);
413 add_wait_queue(&rmidi->open_wait, &wait);
414 while (1) {
415 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
416 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
417 if (err >= 0)
418 break;
419 if (err == -EAGAIN) {
420 if (file->f_flags & O_NONBLOCK) {
421 err = -EBUSY;
422 break;
423 }
424 } else
425 break;
426 set_current_state(TASK_INTERRUPTIBLE);
427 mutex_unlock(&rmidi->open_mutex);
428 schedule();
429 mutex_lock(&rmidi->open_mutex);
430 if (rmidi->card->shutdown) {
431 err = -ENODEV;
432 break;
433 }
434 if (signal_pending(current)) {
435 err = -ERESTARTSYS;
436 break;
437 }
438 }
439 remove_wait_queue(&rmidi->open_wait, &wait);
440 if (err < 0) {
441 kfree(rawmidi_file);
442 goto __error;
443 }
444 #ifdef CONFIG_SND_OSSEMUL
445 if (rawmidi_file->input && rawmidi_file->input->runtime)
446 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
447 if (rawmidi_file->output && rawmidi_file->output->runtime)
448 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
449 #endif
450 file->private_data = rawmidi_file;
451 mutex_unlock(&rmidi->open_mutex);
452 snd_card_unref(rmidi->card);
453 return 0;
454
455 __error:
456 snd_card_file_remove(card, file);
457 __error_card:
458 mutex_unlock(&rmidi->open_mutex);
459 module_put(rmidi->card->module);
460 snd_card_unref(rmidi->card);
461 return err;
462 }
463
464 static void close_substream(struct snd_rawmidi *rmidi,
465 struct snd_rawmidi_substream *substream,
466 int cleanup)
467 {
468 if (--substream->use_count)
469 return;
470
471 if (cleanup) {
472 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
473 snd_rawmidi_input_trigger(substream, 0);
474 else {
475 if (substream->active_sensing) {
476 unsigned char buf = 0xfe;
477 /* sending single active sensing message
478 * to shut the device up
479 */
480 snd_rawmidi_kernel_write(substream, &buf, 1);
481 }
482 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
483 snd_rawmidi_output_trigger(substream, 0);
484 }
485 }
486 substream->ops->close(substream);
487 if (substream->runtime->private_free)
488 substream->runtime->private_free(substream);
489 snd_rawmidi_runtime_free(substream);
490 substream->opened = 0;
491 substream->append = 0;
492 put_pid(substream->pid);
493 substream->pid = NULL;
494 rmidi->streams[substream->stream].substream_opened--;
495 }
496
497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
498 {
499 struct snd_rawmidi *rmidi;
500
501 rmidi = rfile->rmidi;
502 mutex_lock(&rmidi->open_mutex);
503 if (rfile->input) {
504 close_substream(rmidi, rfile->input, 1);
505 rfile->input = NULL;
506 }
507 if (rfile->output) {
508 close_substream(rmidi, rfile->output, 1);
509 rfile->output = NULL;
510 }
511 rfile->rmidi = NULL;
512 mutex_unlock(&rmidi->open_mutex);
513 wake_up(&rmidi->open_wait);
514 }
515
516 /* called from sound/core/seq/seq_midi.c */
517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
518 {
519 struct snd_rawmidi *rmidi;
520
521 if (snd_BUG_ON(!rfile))
522 return -ENXIO;
523
524 rmidi = rfile->rmidi;
525 rawmidi_release_priv(rfile);
526 module_put(rmidi->card->module);
527 return 0;
528 }
529 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
530
531 static int snd_rawmidi_release(struct inode *inode, struct file *file)
532 {
533 struct snd_rawmidi_file *rfile;
534 struct snd_rawmidi *rmidi;
535 struct module *module;
536
537 rfile = file->private_data;
538 rmidi = rfile->rmidi;
539 rawmidi_release_priv(rfile);
540 kfree(rfile);
541 module = rmidi->card->module;
542 snd_card_file_remove(rmidi->card, file);
543 module_put(module);
544 return 0;
545 }
546
547 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
548 struct snd_rawmidi_info *info)
549 {
550 struct snd_rawmidi *rmidi;
551
552 if (substream == NULL)
553 return -ENODEV;
554 rmidi = substream->rmidi;
555 memset(info, 0, sizeof(*info));
556 info->card = rmidi->card->number;
557 info->device = rmidi->device;
558 info->subdevice = substream->number;
559 info->stream = substream->stream;
560 info->flags = rmidi->info_flags;
561 strcpy(info->id, rmidi->id);
562 strcpy(info->name, rmidi->name);
563 strcpy(info->subname, substream->name);
564 info->subdevices_count = substream->pstr->substream_count;
565 info->subdevices_avail = (substream->pstr->substream_count -
566 substream->pstr->substream_opened);
567 return 0;
568 }
569
570 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
571 struct snd_rawmidi_info __user * _info)
572 {
573 struct snd_rawmidi_info info;
574 int err;
575 if ((err = snd_rawmidi_info(substream, &info)) < 0)
576 return err;
577 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
578 return -EFAULT;
579 return 0;
580 }
581
582 static int __snd_rawmidi_info_select(struct snd_card *card,
583 struct snd_rawmidi_info *info)
584 {
585 struct snd_rawmidi *rmidi;
586 struct snd_rawmidi_str *pstr;
587 struct snd_rawmidi_substream *substream;
588
589 rmidi = snd_rawmidi_search(card, info->device);
590 if (!rmidi)
591 return -ENXIO;
592 if (info->stream < 0 || info->stream > 1)
593 return -EINVAL;
594 pstr = &rmidi->streams[info->stream];
595 if (pstr->substream_count == 0)
596 return -ENOENT;
597 if (info->subdevice >= pstr->substream_count)
598 return -ENXIO;
599 list_for_each_entry(substream, &pstr->substreams, list) {
600 if ((unsigned int)substream->number == info->subdevice)
601 return snd_rawmidi_info(substream, info);
602 }
603 return -ENXIO;
604 }
605
606 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
607 {
608 int ret;
609
610 mutex_lock(&register_mutex);
611 ret = __snd_rawmidi_info_select(card, info);
612 mutex_unlock(&register_mutex);
613 return ret;
614 }
615 EXPORT_SYMBOL(snd_rawmidi_info_select);
616
617 static int snd_rawmidi_info_select_user(struct snd_card *card,
618 struct snd_rawmidi_info __user *_info)
619 {
620 int err;
621 struct snd_rawmidi_info info;
622 if (get_user(info.device, &_info->device))
623 return -EFAULT;
624 if (get_user(info.stream, &_info->stream))
625 return -EFAULT;
626 if (get_user(info.subdevice, &_info->subdevice))
627 return -EFAULT;
628 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
629 return err;
630 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
631 return -EFAULT;
632 return 0;
633 }
634
635 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
636 struct snd_rawmidi_params * params)
637 {
638 char *newbuf;
639 struct snd_rawmidi_runtime *runtime = substream->runtime;
640
641 if (substream->append && substream->use_count > 1)
642 return -EBUSY;
643 snd_rawmidi_drain_output(substream);
644 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
645 return -EINVAL;
646 }
647 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
648 return -EINVAL;
649 }
650 if (params->buffer_size != runtime->buffer_size) {
651 newbuf = krealloc(runtime->buffer, params->buffer_size,
652 GFP_KERNEL);
653 if (!newbuf)
654 return -ENOMEM;
655 runtime->buffer = newbuf;
656 runtime->buffer_size = params->buffer_size;
657 runtime->avail = runtime->buffer_size;
658 }
659 runtime->avail_min = params->avail_min;
660 substream->active_sensing = !params->no_active_sensing;
661 return 0;
662 }
663 EXPORT_SYMBOL(snd_rawmidi_output_params);
664
665 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
666 struct snd_rawmidi_params * params)
667 {
668 char *newbuf;
669 struct snd_rawmidi_runtime *runtime = substream->runtime;
670
671 snd_rawmidi_drain_input(substream);
672 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
673 return -EINVAL;
674 }
675 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
676 return -EINVAL;
677 }
678 if (params->buffer_size != runtime->buffer_size) {
679 newbuf = krealloc(runtime->buffer, params->buffer_size,
680 GFP_KERNEL);
681 if (!newbuf)
682 return -ENOMEM;
683 runtime->buffer = newbuf;
684 runtime->buffer_size = params->buffer_size;
685 }
686 runtime->avail_min = params->avail_min;
687 return 0;
688 }
689 EXPORT_SYMBOL(snd_rawmidi_input_params);
690
691 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
692 struct snd_rawmidi_status * status)
693 {
694 struct snd_rawmidi_runtime *runtime = substream->runtime;
695
696 memset(status, 0, sizeof(*status));
697 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
698 spin_lock_irq(&runtime->lock);
699 status->avail = runtime->avail;
700 spin_unlock_irq(&runtime->lock);
701 return 0;
702 }
703
704 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
705 struct snd_rawmidi_status * status)
706 {
707 struct snd_rawmidi_runtime *runtime = substream->runtime;
708
709 memset(status, 0, sizeof(*status));
710 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
711 spin_lock_irq(&runtime->lock);
712 status->avail = runtime->avail;
713 status->xruns = runtime->xruns;
714 runtime->xruns = 0;
715 spin_unlock_irq(&runtime->lock);
716 return 0;
717 }
718
719 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
720 {
721 struct snd_rawmidi_file *rfile;
722 void __user *argp = (void __user *)arg;
723
724 rfile = file->private_data;
725 if (((cmd >> 8) & 0xff) != 'W')
726 return -ENOTTY;
727 switch (cmd) {
728 case SNDRV_RAWMIDI_IOCTL_PVERSION:
729 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
730 case SNDRV_RAWMIDI_IOCTL_INFO:
731 {
732 int stream;
733 struct snd_rawmidi_info __user *info = argp;
734 if (get_user(stream, &info->stream))
735 return -EFAULT;
736 switch (stream) {
737 case SNDRV_RAWMIDI_STREAM_INPUT:
738 return snd_rawmidi_info_user(rfile->input, info);
739 case SNDRV_RAWMIDI_STREAM_OUTPUT:
740 return snd_rawmidi_info_user(rfile->output, info);
741 default:
742 return -EINVAL;
743 }
744 }
745 case SNDRV_RAWMIDI_IOCTL_PARAMS:
746 {
747 struct snd_rawmidi_params params;
748 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
749 return -EFAULT;
750 switch (params.stream) {
751 case SNDRV_RAWMIDI_STREAM_OUTPUT:
752 if (rfile->output == NULL)
753 return -EINVAL;
754 return snd_rawmidi_output_params(rfile->output, &params);
755 case SNDRV_RAWMIDI_STREAM_INPUT:
756 if (rfile->input == NULL)
757 return -EINVAL;
758 return snd_rawmidi_input_params(rfile->input, &params);
759 default:
760 return -EINVAL;
761 }
762 }
763 case SNDRV_RAWMIDI_IOCTL_STATUS:
764 {
765 int err = 0;
766 struct snd_rawmidi_status status;
767 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
768 return -EFAULT;
769 switch (status.stream) {
770 case SNDRV_RAWMIDI_STREAM_OUTPUT:
771 if (rfile->output == NULL)
772 return -EINVAL;
773 err = snd_rawmidi_output_status(rfile->output, &status);
774 break;
775 case SNDRV_RAWMIDI_STREAM_INPUT:
776 if (rfile->input == NULL)
777 return -EINVAL;
778 err = snd_rawmidi_input_status(rfile->input, &status);
779 break;
780 default:
781 return -EINVAL;
782 }
783 if (err < 0)
784 return err;
785 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
786 return -EFAULT;
787 return 0;
788 }
789 case SNDRV_RAWMIDI_IOCTL_DROP:
790 {
791 int val;
792 if (get_user(val, (int __user *) argp))
793 return -EFAULT;
794 switch (val) {
795 case SNDRV_RAWMIDI_STREAM_OUTPUT:
796 if (rfile->output == NULL)
797 return -EINVAL;
798 return snd_rawmidi_drop_output(rfile->output);
799 default:
800 return -EINVAL;
801 }
802 }
803 case SNDRV_RAWMIDI_IOCTL_DRAIN:
804 {
805 int val;
806 if (get_user(val, (int __user *) argp))
807 return -EFAULT;
808 switch (val) {
809 case SNDRV_RAWMIDI_STREAM_OUTPUT:
810 if (rfile->output == NULL)
811 return -EINVAL;
812 return snd_rawmidi_drain_output(rfile->output);
813 case SNDRV_RAWMIDI_STREAM_INPUT:
814 if (rfile->input == NULL)
815 return -EINVAL;
816 return snd_rawmidi_drain_input(rfile->input);
817 default:
818 return -EINVAL;
819 }
820 }
821 default:
822 rmidi_dbg(rfile->rmidi,
823 "rawmidi: unknown command = 0x%x\n", cmd);
824 }
825 return -ENOTTY;
826 }
827
828 static int snd_rawmidi_control_ioctl(struct snd_card *card,
829 struct snd_ctl_file *control,
830 unsigned int cmd,
831 unsigned long arg)
832 {
833 void __user *argp = (void __user *)arg;
834
835 switch (cmd) {
836 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
837 {
838 int device;
839
840 if (get_user(device, (int __user *)argp))
841 return -EFAULT;
842 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
843 device = SNDRV_RAWMIDI_DEVICES - 1;
844 mutex_lock(&register_mutex);
845 device = device < 0 ? 0 : device + 1;
846 while (device < SNDRV_RAWMIDI_DEVICES) {
847 if (snd_rawmidi_search(card, device))
848 break;
849 device++;
850 }
851 if (device == SNDRV_RAWMIDI_DEVICES)
852 device = -1;
853 mutex_unlock(&register_mutex);
854 if (put_user(device, (int __user *)argp))
855 return -EFAULT;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
859 {
860 int val;
861
862 if (get_user(val, (int __user *)argp))
863 return -EFAULT;
864 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
865 return 0;
866 }
867 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
868 return snd_rawmidi_info_select_user(card, argp);
869 }
870 return -ENOIOCTLCMD;
871 }
872
873 /**
874 * snd_rawmidi_receive - receive the input data from the device
875 * @substream: the rawmidi substream
876 * @buffer: the buffer pointer
877 * @count: the data size to read
878 *
879 * Reads the data from the internal buffer.
880 *
881 * Return: The size of read data, or a negative error code on failure.
882 */
883 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
884 const unsigned char *buffer, int count)
885 {
886 unsigned long flags;
887 int result = 0, count1;
888 struct snd_rawmidi_runtime *runtime = substream->runtime;
889
890 if (!substream->opened)
891 return -EBADFD;
892 if (runtime->buffer == NULL) {
893 rmidi_dbg(substream->rmidi,
894 "snd_rawmidi_receive: input is not active!!!\n");
895 return -EINVAL;
896 }
897 spin_lock_irqsave(&runtime->lock, flags);
898 if (count == 1) { /* special case, faster code */
899 substream->bytes++;
900 if (runtime->avail < runtime->buffer_size) {
901 runtime->buffer[runtime->hw_ptr++] = buffer[0];
902 runtime->hw_ptr %= runtime->buffer_size;
903 runtime->avail++;
904 result++;
905 } else {
906 runtime->xruns++;
907 }
908 } else {
909 substream->bytes += count;
910 count1 = runtime->buffer_size - runtime->hw_ptr;
911 if (count1 > count)
912 count1 = count;
913 if (count1 > (int)(runtime->buffer_size - runtime->avail))
914 count1 = runtime->buffer_size - runtime->avail;
915 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
916 runtime->hw_ptr += count1;
917 runtime->hw_ptr %= runtime->buffer_size;
918 runtime->avail += count1;
919 count -= count1;
920 result += count1;
921 if (count > 0) {
922 buffer += count1;
923 count1 = count;
924 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
925 count1 = runtime->buffer_size - runtime->avail;
926 runtime->xruns += count - count1;
927 }
928 if (count1 > 0) {
929 memcpy(runtime->buffer, buffer, count1);
930 runtime->hw_ptr = count1;
931 runtime->avail += count1;
932 result += count1;
933 }
934 }
935 }
936 if (result > 0) {
937 if (runtime->event)
938 schedule_work(&runtime->event_work);
939 else if (snd_rawmidi_ready(substream))
940 wake_up(&runtime->sleep);
941 }
942 spin_unlock_irqrestore(&runtime->lock, flags);
943 return result;
944 }
945 EXPORT_SYMBOL(snd_rawmidi_receive);
946
947 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
948 unsigned char __user *userbuf,
949 unsigned char *kernelbuf, long count)
950 {
951 unsigned long flags;
952 long result = 0, count1;
953 struct snd_rawmidi_runtime *runtime = substream->runtime;
954 unsigned long appl_ptr;
955
956 spin_lock_irqsave(&runtime->lock, flags);
957 while (count > 0 && runtime->avail) {
958 count1 = runtime->buffer_size - runtime->appl_ptr;
959 if (count1 > count)
960 count1 = count;
961 if (count1 > (int)runtime->avail)
962 count1 = runtime->avail;
963
964 /* update runtime->appl_ptr before unlocking for userbuf */
965 appl_ptr = runtime->appl_ptr;
966 runtime->appl_ptr += count1;
967 runtime->appl_ptr %= runtime->buffer_size;
968 runtime->avail -= count1;
969
970 if (kernelbuf)
971 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
972 if (userbuf) {
973 spin_unlock_irqrestore(&runtime->lock, flags);
974 if (copy_to_user(userbuf + result,
975 runtime->buffer + appl_ptr, count1)) {
976 return result > 0 ? result : -EFAULT;
977 }
978 spin_lock_irqsave(&runtime->lock, flags);
979 }
980 result += count1;
981 count -= count1;
982 }
983 spin_unlock_irqrestore(&runtime->lock, flags);
984 return result;
985 }
986
987 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
988 unsigned char *buf, long count)
989 {
990 snd_rawmidi_input_trigger(substream, 1);
991 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
992 }
993 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
994
995 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
996 loff_t *offset)
997 {
998 long result;
999 int count1;
1000 struct snd_rawmidi_file *rfile;
1001 struct snd_rawmidi_substream *substream;
1002 struct snd_rawmidi_runtime *runtime;
1003
1004 rfile = file->private_data;
1005 substream = rfile->input;
1006 if (substream == NULL)
1007 return -EIO;
1008 runtime = substream->runtime;
1009 snd_rawmidi_input_trigger(substream, 1);
1010 result = 0;
1011 while (count > 0) {
1012 spin_lock_irq(&runtime->lock);
1013 while (!snd_rawmidi_ready(substream)) {
1014 wait_queue_entry_t wait;
1015 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1016 spin_unlock_irq(&runtime->lock);
1017 return result > 0 ? result : -EAGAIN;
1018 }
1019 init_waitqueue_entry(&wait, current);
1020 add_wait_queue(&runtime->sleep, &wait);
1021 set_current_state(TASK_INTERRUPTIBLE);
1022 spin_unlock_irq(&runtime->lock);
1023 schedule();
1024 remove_wait_queue(&runtime->sleep, &wait);
1025 if (rfile->rmidi->card->shutdown)
1026 return -ENODEV;
1027 if (signal_pending(current))
1028 return result > 0 ? result : -ERESTARTSYS;
1029 if (!runtime->avail)
1030 return result > 0 ? result : -EIO;
1031 spin_lock_irq(&runtime->lock);
1032 }
1033 spin_unlock_irq(&runtime->lock);
1034 count1 = snd_rawmidi_kernel_read1(substream,
1035 (unsigned char __user *)buf,
1036 NULL/*kernelbuf*/,
1037 count);
1038 if (count1 < 0)
1039 return result > 0 ? result : count1;
1040 result += count1;
1041 buf += count1;
1042 count -= count1;
1043 }
1044 return result;
1045 }
1046
1047 /**
1048 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1049 * @substream: the rawmidi substream
1050 *
1051 * Return: 1 if the internal output buffer is empty, 0 if not.
1052 */
1053 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1054 {
1055 struct snd_rawmidi_runtime *runtime = substream->runtime;
1056 int result;
1057 unsigned long flags;
1058
1059 if (runtime->buffer == NULL) {
1060 rmidi_dbg(substream->rmidi,
1061 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1062 return 1;
1063 }
1064 spin_lock_irqsave(&runtime->lock, flags);
1065 result = runtime->avail >= runtime->buffer_size;
1066 spin_unlock_irqrestore(&runtime->lock, flags);
1067 return result;
1068 }
1069 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1070
1071 /**
1072 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1073 * @substream: the rawmidi substream
1074 * @buffer: the buffer pointer
1075 * @count: data size to transfer
1076 *
1077 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1078 */
1079 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1080 unsigned char *buffer, int count)
1081 {
1082 int result, count1;
1083 struct snd_rawmidi_runtime *runtime = substream->runtime;
1084
1085 if (runtime->buffer == NULL) {
1086 rmidi_dbg(substream->rmidi,
1087 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1088 return -EINVAL;
1089 }
1090 result = 0;
1091 if (runtime->avail >= runtime->buffer_size) {
1092 /* warning: lowlevel layer MUST trigger down the hardware */
1093 goto __skip;
1094 }
1095 if (count == 1) { /* special case, faster code */
1096 *buffer = runtime->buffer[runtime->hw_ptr];
1097 result++;
1098 } else {
1099 count1 = runtime->buffer_size - runtime->hw_ptr;
1100 if (count1 > count)
1101 count1 = count;
1102 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1103 count1 = runtime->buffer_size - runtime->avail;
1104 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1105 count -= count1;
1106 result += count1;
1107 if (count > 0) {
1108 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1109 count = runtime->buffer_size - runtime->avail - count1;
1110 memcpy(buffer + count1, runtime->buffer, count);
1111 result += count;
1112 }
1113 }
1114 __skip:
1115 return result;
1116 }
1117 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1118
1119 /**
1120 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1121 * @substream: the rawmidi substream
1122 * @buffer: the buffer pointer
1123 * @count: data size to transfer
1124 *
1125 * Copies data from the internal output buffer to the given buffer.
1126 *
1127 * Call this in the interrupt handler when the midi output is ready,
1128 * and call snd_rawmidi_transmit_ack() after the transmission is
1129 * finished.
1130 *
1131 * Return: The size of copied data, or a negative error code on failure.
1132 */
1133 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1134 unsigned char *buffer, int count)
1135 {
1136 struct snd_rawmidi_runtime *runtime = substream->runtime;
1137 int result;
1138 unsigned long flags;
1139
1140 spin_lock_irqsave(&runtime->lock, flags);
1141 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1142 spin_unlock_irqrestore(&runtime->lock, flags);
1143 return result;
1144 }
1145 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1146
1147 /**
1148 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1149 * @substream: the rawmidi substream
1150 * @count: the transferred count
1151 *
1152 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1153 */
1154 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1155 {
1156 struct snd_rawmidi_runtime *runtime = substream->runtime;
1157
1158 if (runtime->buffer == NULL) {
1159 rmidi_dbg(substream->rmidi,
1160 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1161 return -EINVAL;
1162 }
1163 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1164 runtime->hw_ptr += count;
1165 runtime->hw_ptr %= runtime->buffer_size;
1166 runtime->avail += count;
1167 substream->bytes += count;
1168 if (count > 0) {
1169 if (runtime->drain || snd_rawmidi_ready(substream))
1170 wake_up(&runtime->sleep);
1171 }
1172 return count;
1173 }
1174 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1175
1176 /**
1177 * snd_rawmidi_transmit_ack - acknowledge the transmission
1178 * @substream: the rawmidi substream
1179 * @count: the transferred count
1180 *
1181 * Advances the hardware pointer for the internal output buffer with
1182 * the given size and updates the condition.
1183 * Call after the transmission is finished.
1184 *
1185 * Return: The advanced size if successful, or a negative error code on failure.
1186 */
1187 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1188 {
1189 struct snd_rawmidi_runtime *runtime = substream->runtime;
1190 int result;
1191 unsigned long flags;
1192
1193 spin_lock_irqsave(&runtime->lock, flags);
1194 result = __snd_rawmidi_transmit_ack(substream, count);
1195 spin_unlock_irqrestore(&runtime->lock, flags);
1196 return result;
1197 }
1198 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1199
1200 /**
1201 * snd_rawmidi_transmit - copy from the buffer to the device
1202 * @substream: the rawmidi substream
1203 * @buffer: the buffer pointer
1204 * @count: the data size to transfer
1205 *
1206 * Copies data from the buffer to the device and advances the pointer.
1207 *
1208 * Return: The copied size if successful, or a negative error code on failure.
1209 */
1210 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1211 unsigned char *buffer, int count)
1212 {
1213 struct snd_rawmidi_runtime *runtime = substream->runtime;
1214 int result;
1215 unsigned long flags;
1216
1217 spin_lock_irqsave(&runtime->lock, flags);
1218 if (!substream->opened)
1219 result = -EBADFD;
1220 else {
1221 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1222 if (count <= 0)
1223 result = count;
1224 else
1225 result = __snd_rawmidi_transmit_ack(substream, count);
1226 }
1227 spin_unlock_irqrestore(&runtime->lock, flags);
1228 return result;
1229 }
1230 EXPORT_SYMBOL(snd_rawmidi_transmit);
1231
1232 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1233 const unsigned char __user *userbuf,
1234 const unsigned char *kernelbuf,
1235 long count)
1236 {
1237 unsigned long flags;
1238 long count1, result;
1239 struct snd_rawmidi_runtime *runtime = substream->runtime;
1240 unsigned long appl_ptr;
1241
1242 if (!kernelbuf && !userbuf)
1243 return -EINVAL;
1244 if (snd_BUG_ON(!runtime->buffer))
1245 return -EINVAL;
1246
1247 result = 0;
1248 spin_lock_irqsave(&runtime->lock, flags);
1249 if (substream->append) {
1250 if ((long)runtime->avail < count) {
1251 spin_unlock_irqrestore(&runtime->lock, flags);
1252 return -EAGAIN;
1253 }
1254 }
1255 while (count > 0 && runtime->avail > 0) {
1256 count1 = runtime->buffer_size - runtime->appl_ptr;
1257 if (count1 > count)
1258 count1 = count;
1259 if (count1 > (long)runtime->avail)
1260 count1 = runtime->avail;
1261
1262 /* update runtime->appl_ptr before unlocking for userbuf */
1263 appl_ptr = runtime->appl_ptr;
1264 runtime->appl_ptr += count1;
1265 runtime->appl_ptr %= runtime->buffer_size;
1266 runtime->avail -= count1;
1267
1268 if (kernelbuf)
1269 memcpy(runtime->buffer + appl_ptr,
1270 kernelbuf + result, count1);
1271 else if (userbuf) {
1272 spin_unlock_irqrestore(&runtime->lock, flags);
1273 if (copy_from_user(runtime->buffer + appl_ptr,
1274 userbuf + result, count1)) {
1275 spin_lock_irqsave(&runtime->lock, flags);
1276 result = result > 0 ? result : -EFAULT;
1277 goto __end;
1278 }
1279 spin_lock_irqsave(&runtime->lock, flags);
1280 }
1281 result += count1;
1282 count -= count1;
1283 }
1284 __end:
1285 count1 = runtime->avail < runtime->buffer_size;
1286 spin_unlock_irqrestore(&runtime->lock, flags);
1287 if (count1)
1288 snd_rawmidi_output_trigger(substream, 1);
1289 return result;
1290 }
1291
1292 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1293 const unsigned char *buf, long count)
1294 {
1295 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1296 }
1297 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1298
1299 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1300 size_t count, loff_t *offset)
1301 {
1302 long result, timeout;
1303 int count1;
1304 struct snd_rawmidi_file *rfile;
1305 struct snd_rawmidi_runtime *runtime;
1306 struct snd_rawmidi_substream *substream;
1307
1308 rfile = file->private_data;
1309 substream = rfile->output;
1310 runtime = substream->runtime;
1311 /* we cannot put an atomic message to our buffer */
1312 if (substream->append && count > runtime->buffer_size)
1313 return -EIO;
1314 result = 0;
1315 while (count > 0) {
1316 spin_lock_irq(&runtime->lock);
1317 while (!snd_rawmidi_ready_append(substream, count)) {
1318 wait_queue_entry_t wait;
1319 if (file->f_flags & O_NONBLOCK) {
1320 spin_unlock_irq(&runtime->lock);
1321 return result > 0 ? result : -EAGAIN;
1322 }
1323 init_waitqueue_entry(&wait, current);
1324 add_wait_queue(&runtime->sleep, &wait);
1325 set_current_state(TASK_INTERRUPTIBLE);
1326 spin_unlock_irq(&runtime->lock);
1327 timeout = schedule_timeout(30 * HZ);
1328 remove_wait_queue(&runtime->sleep, &wait);
1329 if (rfile->rmidi->card->shutdown)
1330 return -ENODEV;
1331 if (signal_pending(current))
1332 return result > 0 ? result : -ERESTARTSYS;
1333 if (!runtime->avail && !timeout)
1334 return result > 0 ? result : -EIO;
1335 spin_lock_irq(&runtime->lock);
1336 }
1337 spin_unlock_irq(&runtime->lock);
1338 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1339 if (count1 < 0)
1340 return result > 0 ? result : count1;
1341 result += count1;
1342 buf += count1;
1343 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1344 break;
1345 count -= count1;
1346 }
1347 if (file->f_flags & O_DSYNC) {
1348 spin_lock_irq(&runtime->lock);
1349 while (runtime->avail != runtime->buffer_size) {
1350 wait_queue_entry_t wait;
1351 unsigned int last_avail = runtime->avail;
1352 init_waitqueue_entry(&wait, current);
1353 add_wait_queue(&runtime->sleep, &wait);
1354 set_current_state(TASK_INTERRUPTIBLE);
1355 spin_unlock_irq(&runtime->lock);
1356 timeout = schedule_timeout(30 * HZ);
1357 remove_wait_queue(&runtime->sleep, &wait);
1358 if (signal_pending(current))
1359 return result > 0 ? result : -ERESTARTSYS;
1360 if (runtime->avail == last_avail && !timeout)
1361 return result > 0 ? result : -EIO;
1362 spin_lock_irq(&runtime->lock);
1363 }
1364 spin_unlock_irq(&runtime->lock);
1365 }
1366 return result;
1367 }
1368
1369 static __poll_t snd_rawmidi_poll(struct file *file, poll_table * wait)
1370 {
1371 struct snd_rawmidi_file *rfile;
1372 struct snd_rawmidi_runtime *runtime;
1373 __poll_t mask;
1374
1375 rfile = file->private_data;
1376 if (rfile->input != NULL) {
1377 runtime = rfile->input->runtime;
1378 snd_rawmidi_input_trigger(rfile->input, 1);
1379 poll_wait(file, &runtime->sleep, wait);
1380 }
1381 if (rfile->output != NULL) {
1382 runtime = rfile->output->runtime;
1383 poll_wait(file, &runtime->sleep, wait);
1384 }
1385 mask = 0;
1386 if (rfile->input != NULL) {
1387 if (snd_rawmidi_ready(rfile->input))
1388 mask |= EPOLLIN | EPOLLRDNORM;
1389 }
1390 if (rfile->output != NULL) {
1391 if (snd_rawmidi_ready(rfile->output))
1392 mask |= EPOLLOUT | EPOLLWRNORM;
1393 }
1394 return mask;
1395 }
1396
1397 /*
1398 */
1399 #ifdef CONFIG_COMPAT
1400 #include "rawmidi_compat.c"
1401 #else
1402 #define snd_rawmidi_ioctl_compat NULL
1403 #endif
1404
1405 /*
1406
1407 */
1408
1409 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1410 struct snd_info_buffer *buffer)
1411 {
1412 struct snd_rawmidi *rmidi;
1413 struct snd_rawmidi_substream *substream;
1414 struct snd_rawmidi_runtime *runtime;
1415
1416 rmidi = entry->private_data;
1417 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1418 mutex_lock(&rmidi->open_mutex);
1419 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1420 list_for_each_entry(substream,
1421 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1422 list) {
1423 snd_iprintf(buffer,
1424 "Output %d\n"
1425 " Tx bytes : %lu\n",
1426 substream->number,
1427 (unsigned long) substream->bytes);
1428 if (substream->opened) {
1429 snd_iprintf(buffer,
1430 " Owner PID : %d\n",
1431 pid_vnr(substream->pid));
1432 runtime = substream->runtime;
1433 snd_iprintf(buffer,
1434 " Mode : %s\n"
1435 " Buffer size : %lu\n"
1436 " Avail : %lu\n",
1437 runtime->oss ? "OSS compatible" : "native",
1438 (unsigned long) runtime->buffer_size,
1439 (unsigned long) runtime->avail);
1440 }
1441 }
1442 }
1443 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1444 list_for_each_entry(substream,
1445 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1446 list) {
1447 snd_iprintf(buffer,
1448 "Input %d\n"
1449 " Rx bytes : %lu\n",
1450 substream->number,
1451 (unsigned long) substream->bytes);
1452 if (substream->opened) {
1453 snd_iprintf(buffer,
1454 " Owner PID : %d\n",
1455 pid_vnr(substream->pid));
1456 runtime = substream->runtime;
1457 snd_iprintf(buffer,
1458 " Buffer size : %lu\n"
1459 " Avail : %lu\n"
1460 " Overruns : %lu\n",
1461 (unsigned long) runtime->buffer_size,
1462 (unsigned long) runtime->avail,
1463 (unsigned long) runtime->xruns);
1464 }
1465 }
1466 }
1467 mutex_unlock(&rmidi->open_mutex);
1468 }
1469
1470 /*
1471 * Register functions
1472 */
1473
1474 static const struct file_operations snd_rawmidi_f_ops =
1475 {
1476 .owner = THIS_MODULE,
1477 .read = snd_rawmidi_read,
1478 .write = snd_rawmidi_write,
1479 .open = snd_rawmidi_open,
1480 .release = snd_rawmidi_release,
1481 .llseek = no_llseek,
1482 .poll = snd_rawmidi_poll,
1483 .unlocked_ioctl = snd_rawmidi_ioctl,
1484 .compat_ioctl = snd_rawmidi_ioctl_compat,
1485 };
1486
1487 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1488 struct snd_rawmidi_str *stream,
1489 int direction,
1490 int count)
1491 {
1492 struct snd_rawmidi_substream *substream;
1493 int idx;
1494
1495 for (idx = 0; idx < count; idx++) {
1496 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1497 if (!substream)
1498 return -ENOMEM;
1499 substream->stream = direction;
1500 substream->number = idx;
1501 substream->rmidi = rmidi;
1502 substream->pstr = stream;
1503 list_add_tail(&substream->list, &stream->substreams);
1504 stream->substream_count++;
1505 }
1506 return 0;
1507 }
1508
1509 static void release_rawmidi_device(struct device *dev)
1510 {
1511 kfree(container_of(dev, struct snd_rawmidi, dev));
1512 }
1513
1514 /**
1515 * snd_rawmidi_new - create a rawmidi instance
1516 * @card: the card instance
1517 * @id: the id string
1518 * @device: the device index
1519 * @output_count: the number of output streams
1520 * @input_count: the number of input streams
1521 * @rrawmidi: the pointer to store the new rawmidi instance
1522 *
1523 * Creates a new rawmidi instance.
1524 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1525 *
1526 * Return: Zero if successful, or a negative error code on failure.
1527 */
1528 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1529 int output_count, int input_count,
1530 struct snd_rawmidi ** rrawmidi)
1531 {
1532 struct snd_rawmidi *rmidi;
1533 int err;
1534 static struct snd_device_ops ops = {
1535 .dev_free = snd_rawmidi_dev_free,
1536 .dev_register = snd_rawmidi_dev_register,
1537 .dev_disconnect = snd_rawmidi_dev_disconnect,
1538 };
1539
1540 if (snd_BUG_ON(!card))
1541 return -ENXIO;
1542 if (rrawmidi)
1543 *rrawmidi = NULL;
1544 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1545 if (!rmidi)
1546 return -ENOMEM;
1547 rmidi->card = card;
1548 rmidi->device = device;
1549 mutex_init(&rmidi->open_mutex);
1550 init_waitqueue_head(&rmidi->open_wait);
1551 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1552 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1553
1554 if (id != NULL)
1555 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1556
1557 snd_device_initialize(&rmidi->dev, card);
1558 rmidi->dev.release = release_rawmidi_device;
1559 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1560
1561 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1562 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1563 SNDRV_RAWMIDI_STREAM_INPUT,
1564 input_count)) < 0) {
1565 snd_rawmidi_free(rmidi);
1566 return err;
1567 }
1568 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1569 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1570 SNDRV_RAWMIDI_STREAM_OUTPUT,
1571 output_count)) < 0) {
1572 snd_rawmidi_free(rmidi);
1573 return err;
1574 }
1575 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1576 snd_rawmidi_free(rmidi);
1577 return err;
1578 }
1579 if (rrawmidi)
1580 *rrawmidi = rmidi;
1581 return 0;
1582 }
1583 EXPORT_SYMBOL(snd_rawmidi_new);
1584
1585 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1586 {
1587 struct snd_rawmidi_substream *substream;
1588
1589 while (!list_empty(&stream->substreams)) {
1590 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1591 list_del(&substream->list);
1592 kfree(substream);
1593 }
1594 }
1595
1596 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1597 {
1598 if (!rmidi)
1599 return 0;
1600
1601 snd_info_free_entry(rmidi->proc_entry);
1602 rmidi->proc_entry = NULL;
1603 mutex_lock(&register_mutex);
1604 if (rmidi->ops && rmidi->ops->dev_unregister)
1605 rmidi->ops->dev_unregister(rmidi);
1606 mutex_unlock(&register_mutex);
1607
1608 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1609 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1610 if (rmidi->private_free)
1611 rmidi->private_free(rmidi);
1612 put_device(&rmidi->dev);
1613 return 0;
1614 }
1615
1616 static int snd_rawmidi_dev_free(struct snd_device *device)
1617 {
1618 struct snd_rawmidi *rmidi = device->device_data;
1619 return snd_rawmidi_free(rmidi);
1620 }
1621
1622 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1623 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1624 {
1625 struct snd_rawmidi *rmidi = device->private_data;
1626 rmidi->seq_dev = NULL;
1627 }
1628 #endif
1629
1630 static int snd_rawmidi_dev_register(struct snd_device *device)
1631 {
1632 int err;
1633 struct snd_info_entry *entry;
1634 char name[16];
1635 struct snd_rawmidi *rmidi = device->device_data;
1636
1637 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1638 return -ENOMEM;
1639 mutex_lock(&register_mutex);
1640 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1641 mutex_unlock(&register_mutex);
1642 return -EBUSY;
1643 }
1644 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1645 mutex_unlock(&register_mutex);
1646 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1647 rmidi->card, rmidi->device,
1648 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1649 if (err < 0) {
1650 rmidi_err(rmidi, "unable to register\n");
1651 mutex_lock(&register_mutex);
1652 list_del(&rmidi->list);
1653 mutex_unlock(&register_mutex);
1654 return err;
1655 }
1656 if (rmidi->ops && rmidi->ops->dev_register &&
1657 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1658 snd_unregister_device(&rmidi->dev);
1659 mutex_lock(&register_mutex);
1660 list_del(&rmidi->list);
1661 mutex_unlock(&register_mutex);
1662 return err;
1663 }
1664 #ifdef CONFIG_SND_OSSEMUL
1665 rmidi->ossreg = 0;
1666 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1667 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1668 rmidi->card, 0, &snd_rawmidi_f_ops,
1669 rmidi) < 0) {
1670 rmidi_err(rmidi,
1671 "unable to register OSS rawmidi device %i:%i\n",
1672 rmidi->card->number, 0);
1673 } else {
1674 rmidi->ossreg++;
1675 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1676 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1677 #endif
1678 }
1679 }
1680 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1681 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1682 rmidi->card, 1, &snd_rawmidi_f_ops,
1683 rmidi) < 0) {
1684 rmidi_err(rmidi,
1685 "unable to register OSS rawmidi device %i:%i\n",
1686 rmidi->card->number, 1);
1687 } else {
1688 rmidi->ossreg++;
1689 }
1690 }
1691 #endif /* CONFIG_SND_OSSEMUL */
1692 sprintf(name, "midi%d", rmidi->device);
1693 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1694 if (entry) {
1695 entry->private_data = rmidi;
1696 entry->c.text.read = snd_rawmidi_proc_info_read;
1697 if (snd_info_register(entry) < 0) {
1698 snd_info_free_entry(entry);
1699 entry = NULL;
1700 }
1701 }
1702 rmidi->proc_entry = entry;
1703 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1704 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1705 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1706 rmidi->seq_dev->private_data = rmidi;
1707 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1708 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1709 snd_device_register(rmidi->card, rmidi->seq_dev);
1710 }
1711 }
1712 #endif
1713 return 0;
1714 }
1715
1716 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1717 {
1718 struct snd_rawmidi *rmidi = device->device_data;
1719 int dir;
1720
1721 mutex_lock(&register_mutex);
1722 mutex_lock(&rmidi->open_mutex);
1723 wake_up(&rmidi->open_wait);
1724 list_del_init(&rmidi->list);
1725 for (dir = 0; dir < 2; dir++) {
1726 struct snd_rawmidi_substream *s;
1727 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1728 if (s->runtime)
1729 wake_up(&s->runtime->sleep);
1730 }
1731 }
1732
1733 #ifdef CONFIG_SND_OSSEMUL
1734 if (rmidi->ossreg) {
1735 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1736 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1737 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1738 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1739 #endif
1740 }
1741 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1742 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1743 rmidi->ossreg = 0;
1744 }
1745 #endif /* CONFIG_SND_OSSEMUL */
1746 snd_unregister_device(&rmidi->dev);
1747 mutex_unlock(&rmidi->open_mutex);
1748 mutex_unlock(&register_mutex);
1749 return 0;
1750 }
1751
1752 /**
1753 * snd_rawmidi_set_ops - set the rawmidi operators
1754 * @rmidi: the rawmidi instance
1755 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1756 * @ops: the operator table
1757 *
1758 * Sets the rawmidi operators for the given stream direction.
1759 */
1760 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1761 const struct snd_rawmidi_ops *ops)
1762 {
1763 struct snd_rawmidi_substream *substream;
1764
1765 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1766 substream->ops = ops;
1767 }
1768 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1769
1770 /*
1771 * ENTRY functions
1772 */
1773
1774 static int __init alsa_rawmidi_init(void)
1775 {
1776
1777 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1778 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1779 #ifdef CONFIG_SND_OSSEMUL
1780 { int i;
1781 /* check device map table */
1782 for (i = 0; i < SNDRV_CARDS; i++) {
1783 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1784 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1785 i, midi_map[i]);
1786 midi_map[i] = 0;
1787 }
1788 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1789 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1790 i, amidi_map[i]);
1791 amidi_map[i] = 1;
1792 }
1793 }
1794 }
1795 #endif /* CONFIG_SND_OSSEMUL */
1796 return 0;
1797 }
1798
1799 static void __exit alsa_rawmidi_exit(void)
1800 {
1801 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1802 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1803 }
1804
1805 module_init(alsa_rawmidi_init)
1806 module_exit(alsa_rawmidi_exit)
Linux with added FPC-III support