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[mirror_ubuntu-zesty-kernel.git] / sound / core / rawmidi.c
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.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_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 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
583 {
584 struct snd_rawmidi *rmidi;
585 struct snd_rawmidi_str *pstr;
586 struct snd_rawmidi_substream *substream;
587
588 mutex_lock(&register_mutex);
589 rmidi = snd_rawmidi_search(card, info->device);
590 mutex_unlock(&register_mutex);
591 if (!rmidi)
592 return -ENXIO;
593 if (info->stream < 0 || info->stream > 1)
594 return -EINVAL;
595 pstr = &rmidi->streams[info->stream];
596 if (pstr->substream_count == 0)
597 return -ENOENT;
598 if (info->subdevice >= pstr->substream_count)
599 return -ENXIO;
600 list_for_each_entry(substream, &pstr->substreams, list) {
601 if ((unsigned int)substream->number == info->subdevice)
602 return snd_rawmidi_info(substream, info);
603 }
604 return -ENXIO;
605 }
606 EXPORT_SYMBOL(snd_rawmidi_info_select);
607
608 static int snd_rawmidi_info_select_user(struct snd_card *card,
609 struct snd_rawmidi_info __user *_info)
610 {
611 int err;
612 struct snd_rawmidi_info info;
613 if (get_user(info.device, &_info->device))
614 return -EFAULT;
615 if (get_user(info.stream, &_info->stream))
616 return -EFAULT;
617 if (get_user(info.subdevice, &_info->subdevice))
618 return -EFAULT;
619 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
620 return err;
621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
622 return -EFAULT;
623 return 0;
624 }
625
626 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
627 struct snd_rawmidi_params * params)
628 {
629 char *newbuf;
630 struct snd_rawmidi_runtime *runtime = substream->runtime;
631
632 if (substream->append && substream->use_count > 1)
633 return -EBUSY;
634 snd_rawmidi_drain_output(substream);
635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
636 return -EINVAL;
637 }
638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
639 return -EINVAL;
640 }
641 if (params->buffer_size != runtime->buffer_size) {
642 newbuf = krealloc(runtime->buffer, params->buffer_size,
643 GFP_KERNEL);
644 if (!newbuf)
645 return -ENOMEM;
646 runtime->buffer = newbuf;
647 runtime->buffer_size = params->buffer_size;
648 runtime->avail = runtime->buffer_size;
649 }
650 runtime->avail_min = params->avail_min;
651 substream->active_sensing = !params->no_active_sensing;
652 return 0;
653 }
654 EXPORT_SYMBOL(snd_rawmidi_output_params);
655
656 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
657 struct snd_rawmidi_params * params)
658 {
659 char *newbuf;
660 struct snd_rawmidi_runtime *runtime = substream->runtime;
661
662 snd_rawmidi_drain_input(substream);
663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
664 return -EINVAL;
665 }
666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
667 return -EINVAL;
668 }
669 if (params->buffer_size != runtime->buffer_size) {
670 newbuf = krealloc(runtime->buffer, params->buffer_size,
671 GFP_KERNEL);
672 if (!newbuf)
673 return -ENOMEM;
674 runtime->buffer = newbuf;
675 runtime->buffer_size = params->buffer_size;
676 }
677 runtime->avail_min = params->avail_min;
678 return 0;
679 }
680 EXPORT_SYMBOL(snd_rawmidi_input_params);
681
682 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683 struct snd_rawmidi_status * status)
684 {
685 struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687 memset(status, 0, sizeof(*status));
688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693 }
694
695 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696 struct snd_rawmidi_status * status)
697 {
698 struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700 memset(status, 0, sizeof(*status));
701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702 spin_lock_irq(&runtime->lock);
703 status->avail = runtime->avail;
704 status->xruns = runtime->xruns;
705 runtime->xruns = 0;
706 spin_unlock_irq(&runtime->lock);
707 return 0;
708 }
709
710 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711 {
712 struct snd_rawmidi_file *rfile;
713 void __user *argp = (void __user *)arg;
714
715 rfile = file->private_data;
716 if (((cmd >> 8) & 0xff) != 'W')
717 return -ENOTTY;
718 switch (cmd) {
719 case SNDRV_RAWMIDI_IOCTL_PVERSION:
720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721 case SNDRV_RAWMIDI_IOCTL_INFO:
722 {
723 int stream;
724 struct snd_rawmidi_info __user *info = argp;
725 if (get_user(stream, &info->stream))
726 return -EFAULT;
727 switch (stream) {
728 case SNDRV_RAWMIDI_STREAM_INPUT:
729 return snd_rawmidi_info_user(rfile->input, info);
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 return snd_rawmidi_info_user(rfile->output, info);
732 default:
733 return -EINVAL;
734 }
735 }
736 case SNDRV_RAWMIDI_IOCTL_PARAMS:
737 {
738 struct snd_rawmidi_params params;
739 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
740 return -EFAULT;
741 switch (params.stream) {
742 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743 if (rfile->output == NULL)
744 return -EINVAL;
745 return snd_rawmidi_output_params(rfile->output, &params);
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 return snd_rawmidi_input_params(rfile->input, &params);
750 default:
751 return -EINVAL;
752 }
753 }
754 case SNDRV_RAWMIDI_IOCTL_STATUS:
755 {
756 int err = 0;
757 struct snd_rawmidi_status status;
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 if (get_user(val, (int __user *) argp))
784 return -EFAULT;
785 switch (val) {
786 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787 if (rfile->output == NULL)
788 return -EINVAL;
789 return snd_rawmidi_drop_output(rfile->output);
790 default:
791 return -EINVAL;
792 }
793 }
794 case SNDRV_RAWMIDI_IOCTL_DRAIN:
795 {
796 int val;
797 if (get_user(val, (int __user *) argp))
798 return -EFAULT;
799 switch (val) {
800 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801 if (rfile->output == NULL)
802 return -EINVAL;
803 return snd_rawmidi_drain_output(rfile->output);
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 return snd_rawmidi_drain_input(rfile->input);
808 default:
809 return -EINVAL;
810 }
811 }
812 default:
813 rmidi_dbg(rfile->rmidi,
814 "rawmidi: unknown command = 0x%x\n", cmd);
815 }
816 return -ENOTTY;
817 }
818
819 static int snd_rawmidi_control_ioctl(struct snd_card *card,
820 struct snd_ctl_file *control,
821 unsigned int cmd,
822 unsigned long arg)
823 {
824 void __user *argp = (void __user *)arg;
825
826 switch (cmd) {
827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
828 {
829 int device;
830
831 if (get_user(device, (int __user *)argp))
832 return -EFAULT;
833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
834 device = SNDRV_RAWMIDI_DEVICES - 1;
835 mutex_lock(&register_mutex);
836 device = device < 0 ? 0 : device + 1;
837 while (device < SNDRV_RAWMIDI_DEVICES) {
838 if (snd_rawmidi_search(card, device))
839 break;
840 device++;
841 }
842 if (device == SNDRV_RAWMIDI_DEVICES)
843 device = -1;
844 mutex_unlock(&register_mutex);
845 if (put_user(device, (int __user *)argp))
846 return -EFAULT;
847 return 0;
848 }
849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
850 {
851 int val;
852
853 if (get_user(val, (int __user *)argp))
854 return -EFAULT;
855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
859 return snd_rawmidi_info_select_user(card, argp);
860 }
861 return -ENOIOCTLCMD;
862 }
863
864 /**
865 * snd_rawmidi_receive - receive the input data from the device
866 * @substream: the rawmidi substream
867 * @buffer: the buffer pointer
868 * @count: the data size to read
869 *
870 * Reads the data from the internal buffer.
871 *
872 * Return: The size of read data, or a negative error code on failure.
873 */
874 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
875 const unsigned char *buffer, int count)
876 {
877 unsigned long flags;
878 int result = 0, count1;
879 struct snd_rawmidi_runtime *runtime = substream->runtime;
880
881 if (!substream->opened)
882 return -EBADFD;
883 if (runtime->buffer == NULL) {
884 rmidi_dbg(substream->rmidi,
885 "snd_rawmidi_receive: input is not active!!!\n");
886 return -EINVAL;
887 }
888 spin_lock_irqsave(&runtime->lock, flags);
889 if (count == 1) { /* special case, faster code */
890 substream->bytes++;
891 if (runtime->avail < runtime->buffer_size) {
892 runtime->buffer[runtime->hw_ptr++] = buffer[0];
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail++;
895 result++;
896 } else {
897 runtime->xruns++;
898 }
899 } else {
900 substream->bytes += count;
901 count1 = runtime->buffer_size - runtime->hw_ptr;
902 if (count1 > count)
903 count1 = count;
904 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905 count1 = runtime->buffer_size - runtime->avail;
906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907 runtime->hw_ptr += count1;
908 runtime->hw_ptr %= runtime->buffer_size;
909 runtime->avail += count1;
910 count -= count1;
911 result += count1;
912 if (count > 0) {
913 buffer += count1;
914 count1 = count;
915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916 count1 = runtime->buffer_size - runtime->avail;
917 runtime->xruns += count - count1;
918 }
919 if (count1 > 0) {
920 memcpy(runtime->buffer, buffer, count1);
921 runtime->hw_ptr = count1;
922 runtime->avail += count1;
923 result += count1;
924 }
925 }
926 }
927 if (result > 0) {
928 if (runtime->event)
929 schedule_work(&runtime->event_work);
930 else if (snd_rawmidi_ready(substream))
931 wake_up(&runtime->sleep);
932 }
933 spin_unlock_irqrestore(&runtime->lock, flags);
934 return result;
935 }
936 EXPORT_SYMBOL(snd_rawmidi_receive);
937
938 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
939 unsigned char __user *userbuf,
940 unsigned char *kernelbuf, long count)
941 {
942 unsigned long flags;
943 long result = 0, count1;
944 struct snd_rawmidi_runtime *runtime = substream->runtime;
945
946 while (count > 0 && runtime->avail) {
947 count1 = runtime->buffer_size - runtime->appl_ptr;
948 if (count1 > count)
949 count1 = count;
950 spin_lock_irqsave(&runtime->lock, flags);
951 if (count1 > (int)runtime->avail)
952 count1 = runtime->avail;
953 if (kernelbuf)
954 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
955 if (userbuf) {
956 spin_unlock_irqrestore(&runtime->lock, flags);
957 if (copy_to_user(userbuf + result,
958 runtime->buffer + runtime->appl_ptr, count1)) {
959 return result > 0 ? result : -EFAULT;
960 }
961 spin_lock_irqsave(&runtime->lock, flags);
962 }
963 runtime->appl_ptr += count1;
964 runtime->appl_ptr %= runtime->buffer_size;
965 runtime->avail -= count1;
966 spin_unlock_irqrestore(&runtime->lock, flags);
967 result += count1;
968 count -= count1;
969 }
970 return result;
971 }
972
973 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
974 unsigned char *buf, long count)
975 {
976 snd_rawmidi_input_trigger(substream, 1);
977 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
978 }
979 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
980
981 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
982 loff_t *offset)
983 {
984 long result;
985 int count1;
986 struct snd_rawmidi_file *rfile;
987 struct snd_rawmidi_substream *substream;
988 struct snd_rawmidi_runtime *runtime;
989
990 rfile = file->private_data;
991 substream = rfile->input;
992 if (substream == NULL)
993 return -EIO;
994 runtime = substream->runtime;
995 snd_rawmidi_input_trigger(substream, 1);
996 result = 0;
997 while (count > 0) {
998 spin_lock_irq(&runtime->lock);
999 while (!snd_rawmidi_ready(substream)) {
1000 wait_queue_t wait;
1001 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1002 spin_unlock_irq(&runtime->lock);
1003 return result > 0 ? result : -EAGAIN;
1004 }
1005 init_waitqueue_entry(&wait, current);
1006 add_wait_queue(&runtime->sleep, &wait);
1007 set_current_state(TASK_INTERRUPTIBLE);
1008 spin_unlock_irq(&runtime->lock);
1009 schedule();
1010 remove_wait_queue(&runtime->sleep, &wait);
1011 if (rfile->rmidi->card->shutdown)
1012 return -ENODEV;
1013 if (signal_pending(current))
1014 return result > 0 ? result : -ERESTARTSYS;
1015 if (!runtime->avail)
1016 return result > 0 ? result : -EIO;
1017 spin_lock_irq(&runtime->lock);
1018 }
1019 spin_unlock_irq(&runtime->lock);
1020 count1 = snd_rawmidi_kernel_read1(substream,
1021 (unsigned char __user *)buf,
1022 NULL/*kernelbuf*/,
1023 count);
1024 if (count1 < 0)
1025 return result > 0 ? result : count1;
1026 result += count1;
1027 buf += count1;
1028 count -= count1;
1029 }
1030 return result;
1031 }
1032
1033 /**
1034 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1035 * @substream: the rawmidi substream
1036 *
1037 * Return: 1 if the internal output buffer is empty, 0 if not.
1038 */
1039 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1040 {
1041 struct snd_rawmidi_runtime *runtime = substream->runtime;
1042 int result;
1043 unsigned long flags;
1044
1045 if (runtime->buffer == NULL) {
1046 rmidi_dbg(substream->rmidi,
1047 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1048 return 1;
1049 }
1050 spin_lock_irqsave(&runtime->lock, flags);
1051 result = runtime->avail >= runtime->buffer_size;
1052 spin_unlock_irqrestore(&runtime->lock, flags);
1053 return result;
1054 }
1055 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1056
1057 /**
1058 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1059 * @substream: the rawmidi substream
1060 * @buffer: the buffer pointer
1061 * @count: data size to transfer
1062 *
1063 * Copies data from the internal output buffer to the given buffer.
1064 *
1065 * Call this in the interrupt handler when the midi output is ready,
1066 * and call snd_rawmidi_transmit_ack() after the transmission is
1067 * finished.
1068 *
1069 * Return: The size of copied data, or a negative error code on failure.
1070 */
1071 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1072 unsigned char *buffer, int count)
1073 {
1074 unsigned long flags;
1075 int result, count1;
1076 struct snd_rawmidi_runtime *runtime = substream->runtime;
1077
1078 if (runtime->buffer == NULL) {
1079 rmidi_dbg(substream->rmidi,
1080 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1081 return -EINVAL;
1082 }
1083 result = 0;
1084 spin_lock_irqsave(&runtime->lock, flags);
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 spin_unlock_irqrestore(&runtime->lock, flags);
1110 return result;
1111 }
1112 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1113
1114 /**
1115 * snd_rawmidi_transmit_ack - acknowledge the transmission
1116 * @substream: the rawmidi substream
1117 * @count: the transferred count
1118 *
1119 * Advances the hardware pointer for the internal output buffer with
1120 * the given size and updates the condition.
1121 * Call after the transmission is finished.
1122 *
1123 * Return: The advanced size if successful, or a negative error code on failure.
1124 */
1125 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1126 {
1127 unsigned long flags;
1128 struct snd_rawmidi_runtime *runtime = substream->runtime;
1129
1130 if (runtime->buffer == NULL) {
1131 rmidi_dbg(substream->rmidi,
1132 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1133 return -EINVAL;
1134 }
1135 spin_lock_irqsave(&runtime->lock, flags);
1136 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1137 runtime->hw_ptr += count;
1138 runtime->hw_ptr %= runtime->buffer_size;
1139 runtime->avail += count;
1140 substream->bytes += count;
1141 if (count > 0) {
1142 if (runtime->drain || snd_rawmidi_ready(substream))
1143 wake_up(&runtime->sleep);
1144 }
1145 spin_unlock_irqrestore(&runtime->lock, flags);
1146 return count;
1147 }
1148 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1149
1150 /**
1151 * snd_rawmidi_transmit - copy from the buffer to the device
1152 * @substream: the rawmidi substream
1153 * @buffer: the buffer pointer
1154 * @count: the data size to transfer
1155 *
1156 * Copies data from the buffer to the device and advances the pointer.
1157 *
1158 * Return: The copied size if successful, or a negative error code on failure.
1159 */
1160 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1161 unsigned char *buffer, int count)
1162 {
1163 if (!substream->opened)
1164 return -EBADFD;
1165 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1166 if (count < 0)
1167 return count;
1168 return snd_rawmidi_transmit_ack(substream, count);
1169 }
1170 EXPORT_SYMBOL(snd_rawmidi_transmit);
1171
1172 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1173 const unsigned char __user *userbuf,
1174 const unsigned char *kernelbuf,
1175 long count)
1176 {
1177 unsigned long flags;
1178 long count1, result;
1179 struct snd_rawmidi_runtime *runtime = substream->runtime;
1180
1181 if (snd_BUG_ON(!kernelbuf && !userbuf))
1182 return -EINVAL;
1183 if (snd_BUG_ON(!runtime->buffer))
1184 return -EINVAL;
1185
1186 result = 0;
1187 spin_lock_irqsave(&runtime->lock, flags);
1188 if (substream->append) {
1189 if ((long)runtime->avail < count) {
1190 spin_unlock_irqrestore(&runtime->lock, flags);
1191 return -EAGAIN;
1192 }
1193 }
1194 while (count > 0 && runtime->avail > 0) {
1195 count1 = runtime->buffer_size - runtime->appl_ptr;
1196 if (count1 > count)
1197 count1 = count;
1198 if (count1 > (long)runtime->avail)
1199 count1 = runtime->avail;
1200 if (kernelbuf)
1201 memcpy(runtime->buffer + runtime->appl_ptr,
1202 kernelbuf + result, count1);
1203 else if (userbuf) {
1204 spin_unlock_irqrestore(&runtime->lock, flags);
1205 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1206 userbuf + result, count1)) {
1207 spin_lock_irqsave(&runtime->lock, flags);
1208 result = result > 0 ? result : -EFAULT;
1209 goto __end;
1210 }
1211 spin_lock_irqsave(&runtime->lock, flags);
1212 }
1213 runtime->appl_ptr += count1;
1214 runtime->appl_ptr %= runtime->buffer_size;
1215 runtime->avail -= count1;
1216 result += count1;
1217 count -= count1;
1218 }
1219 __end:
1220 count1 = runtime->avail < runtime->buffer_size;
1221 spin_unlock_irqrestore(&runtime->lock, flags);
1222 if (count1)
1223 snd_rawmidi_output_trigger(substream, 1);
1224 return result;
1225 }
1226
1227 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1228 const unsigned char *buf, long count)
1229 {
1230 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1231 }
1232 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1233
1234 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1235 size_t count, loff_t *offset)
1236 {
1237 long result, timeout;
1238 int count1;
1239 struct snd_rawmidi_file *rfile;
1240 struct snd_rawmidi_runtime *runtime;
1241 struct snd_rawmidi_substream *substream;
1242
1243 rfile = file->private_data;
1244 substream = rfile->output;
1245 runtime = substream->runtime;
1246 /* we cannot put an atomic message to our buffer */
1247 if (substream->append && count > runtime->buffer_size)
1248 return -EIO;
1249 result = 0;
1250 while (count > 0) {
1251 spin_lock_irq(&runtime->lock);
1252 while (!snd_rawmidi_ready_append(substream, count)) {
1253 wait_queue_t wait;
1254 if (file->f_flags & O_NONBLOCK) {
1255 spin_unlock_irq(&runtime->lock);
1256 return result > 0 ? result : -EAGAIN;
1257 }
1258 init_waitqueue_entry(&wait, current);
1259 add_wait_queue(&runtime->sleep, &wait);
1260 set_current_state(TASK_INTERRUPTIBLE);
1261 spin_unlock_irq(&runtime->lock);
1262 timeout = schedule_timeout(30 * HZ);
1263 remove_wait_queue(&runtime->sleep, &wait);
1264 if (rfile->rmidi->card->shutdown)
1265 return -ENODEV;
1266 if (signal_pending(current))
1267 return result > 0 ? result : -ERESTARTSYS;
1268 if (!runtime->avail && !timeout)
1269 return result > 0 ? result : -EIO;
1270 spin_lock_irq(&runtime->lock);
1271 }
1272 spin_unlock_irq(&runtime->lock);
1273 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1274 if (count1 < 0)
1275 return result > 0 ? result : count1;
1276 result += count1;
1277 buf += count1;
1278 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1279 break;
1280 count -= count1;
1281 }
1282 if (file->f_flags & O_DSYNC) {
1283 spin_lock_irq(&runtime->lock);
1284 while (runtime->avail != runtime->buffer_size) {
1285 wait_queue_t wait;
1286 unsigned int last_avail = runtime->avail;
1287 init_waitqueue_entry(&wait, current);
1288 add_wait_queue(&runtime->sleep, &wait);
1289 set_current_state(TASK_INTERRUPTIBLE);
1290 spin_unlock_irq(&runtime->lock);
1291 timeout = schedule_timeout(30 * HZ);
1292 remove_wait_queue(&runtime->sleep, &wait);
1293 if (signal_pending(current))
1294 return result > 0 ? result : -ERESTARTSYS;
1295 if (runtime->avail == last_avail && !timeout)
1296 return result > 0 ? result : -EIO;
1297 spin_lock_irq(&runtime->lock);
1298 }
1299 spin_unlock_irq(&runtime->lock);
1300 }
1301 return result;
1302 }
1303
1304 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1305 {
1306 struct snd_rawmidi_file *rfile;
1307 struct snd_rawmidi_runtime *runtime;
1308 unsigned int mask;
1309
1310 rfile = file->private_data;
1311 if (rfile->input != NULL) {
1312 runtime = rfile->input->runtime;
1313 snd_rawmidi_input_trigger(rfile->input, 1);
1314 poll_wait(file, &runtime->sleep, wait);
1315 }
1316 if (rfile->output != NULL) {
1317 runtime = rfile->output->runtime;
1318 poll_wait(file, &runtime->sleep, wait);
1319 }
1320 mask = 0;
1321 if (rfile->input != NULL) {
1322 if (snd_rawmidi_ready(rfile->input))
1323 mask |= POLLIN | POLLRDNORM;
1324 }
1325 if (rfile->output != NULL) {
1326 if (snd_rawmidi_ready(rfile->output))
1327 mask |= POLLOUT | POLLWRNORM;
1328 }
1329 return mask;
1330 }
1331
1332 /*
1333 */
1334 #ifdef CONFIG_COMPAT
1335 #include "rawmidi_compat.c"
1336 #else
1337 #define snd_rawmidi_ioctl_compat NULL
1338 #endif
1339
1340 /*
1341
1342 */
1343
1344 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1345 struct snd_info_buffer *buffer)
1346 {
1347 struct snd_rawmidi *rmidi;
1348 struct snd_rawmidi_substream *substream;
1349 struct snd_rawmidi_runtime *runtime;
1350
1351 rmidi = entry->private_data;
1352 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1353 mutex_lock(&rmidi->open_mutex);
1354 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1355 list_for_each_entry(substream,
1356 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1357 list) {
1358 snd_iprintf(buffer,
1359 "Output %d\n"
1360 " Tx bytes : %lu\n",
1361 substream->number,
1362 (unsigned long) substream->bytes);
1363 if (substream->opened) {
1364 snd_iprintf(buffer,
1365 " Owner PID : %d\n",
1366 pid_vnr(substream->pid));
1367 runtime = substream->runtime;
1368 snd_iprintf(buffer,
1369 " Mode : %s\n"
1370 " Buffer size : %lu\n"
1371 " Avail : %lu\n",
1372 runtime->oss ? "OSS compatible" : "native",
1373 (unsigned long) runtime->buffer_size,
1374 (unsigned long) runtime->avail);
1375 }
1376 }
1377 }
1378 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1379 list_for_each_entry(substream,
1380 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1381 list) {
1382 snd_iprintf(buffer,
1383 "Input %d\n"
1384 " Rx bytes : %lu\n",
1385 substream->number,
1386 (unsigned long) substream->bytes);
1387 if (substream->opened) {
1388 snd_iprintf(buffer,
1389 " Owner PID : %d\n",
1390 pid_vnr(substream->pid));
1391 runtime = substream->runtime;
1392 snd_iprintf(buffer,
1393 " Buffer size : %lu\n"
1394 " Avail : %lu\n"
1395 " Overruns : %lu\n",
1396 (unsigned long) runtime->buffer_size,
1397 (unsigned long) runtime->avail,
1398 (unsigned long) runtime->xruns);
1399 }
1400 }
1401 }
1402 mutex_unlock(&rmidi->open_mutex);
1403 }
1404
1405 /*
1406 * Register functions
1407 */
1408
1409 static const struct file_operations snd_rawmidi_f_ops =
1410 {
1411 .owner = THIS_MODULE,
1412 .read = snd_rawmidi_read,
1413 .write = snd_rawmidi_write,
1414 .open = snd_rawmidi_open,
1415 .release = snd_rawmidi_release,
1416 .llseek = no_llseek,
1417 .poll = snd_rawmidi_poll,
1418 .unlocked_ioctl = snd_rawmidi_ioctl,
1419 .compat_ioctl = snd_rawmidi_ioctl_compat,
1420 };
1421
1422 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1423 struct snd_rawmidi_str *stream,
1424 int direction,
1425 int count)
1426 {
1427 struct snd_rawmidi_substream *substream;
1428 int idx;
1429
1430 for (idx = 0; idx < count; idx++) {
1431 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1432 if (!substream)
1433 return -ENOMEM;
1434 substream->stream = direction;
1435 substream->number = idx;
1436 substream->rmidi = rmidi;
1437 substream->pstr = stream;
1438 list_add_tail(&substream->list, &stream->substreams);
1439 stream->substream_count++;
1440 }
1441 return 0;
1442 }
1443
1444 static void release_rawmidi_device(struct device *dev)
1445 {
1446 kfree(container_of(dev, struct snd_rawmidi, dev));
1447 }
1448
1449 /**
1450 * snd_rawmidi_new - create a rawmidi instance
1451 * @card: the card instance
1452 * @id: the id string
1453 * @device: the device index
1454 * @output_count: the number of output streams
1455 * @input_count: the number of input streams
1456 * @rrawmidi: the pointer to store the new rawmidi instance
1457 *
1458 * Creates a new rawmidi instance.
1459 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1460 *
1461 * Return: Zero if successful, or a negative error code on failure.
1462 */
1463 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1464 int output_count, int input_count,
1465 struct snd_rawmidi ** rrawmidi)
1466 {
1467 struct snd_rawmidi *rmidi;
1468 int err;
1469 static struct snd_device_ops ops = {
1470 .dev_free = snd_rawmidi_dev_free,
1471 .dev_register = snd_rawmidi_dev_register,
1472 .dev_disconnect = snd_rawmidi_dev_disconnect,
1473 };
1474
1475 if (snd_BUG_ON(!card))
1476 return -ENXIO;
1477 if (rrawmidi)
1478 *rrawmidi = NULL;
1479 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1480 if (!rmidi)
1481 return -ENOMEM;
1482 rmidi->card = card;
1483 rmidi->device = device;
1484 mutex_init(&rmidi->open_mutex);
1485 init_waitqueue_head(&rmidi->open_wait);
1486 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1487 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1488
1489 if (id != NULL)
1490 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1491
1492 snd_device_initialize(&rmidi->dev, card);
1493 rmidi->dev.release = release_rawmidi_device;
1494 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1495
1496 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1497 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1498 SNDRV_RAWMIDI_STREAM_INPUT,
1499 input_count)) < 0) {
1500 snd_rawmidi_free(rmidi);
1501 return err;
1502 }
1503 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1504 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1505 SNDRV_RAWMIDI_STREAM_OUTPUT,
1506 output_count)) < 0) {
1507 snd_rawmidi_free(rmidi);
1508 return err;
1509 }
1510 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1511 snd_rawmidi_free(rmidi);
1512 return err;
1513 }
1514 if (rrawmidi)
1515 *rrawmidi = rmidi;
1516 return 0;
1517 }
1518 EXPORT_SYMBOL(snd_rawmidi_new);
1519
1520 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1521 {
1522 struct snd_rawmidi_substream *substream;
1523
1524 while (!list_empty(&stream->substreams)) {
1525 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1526 list_del(&substream->list);
1527 kfree(substream);
1528 }
1529 }
1530
1531 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1532 {
1533 if (!rmidi)
1534 return 0;
1535
1536 snd_info_free_entry(rmidi->proc_entry);
1537 rmidi->proc_entry = NULL;
1538 mutex_lock(&register_mutex);
1539 if (rmidi->ops && rmidi->ops->dev_unregister)
1540 rmidi->ops->dev_unregister(rmidi);
1541 mutex_unlock(&register_mutex);
1542
1543 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1544 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1545 if (rmidi->private_free)
1546 rmidi->private_free(rmidi);
1547 put_device(&rmidi->dev);
1548 return 0;
1549 }
1550
1551 static int snd_rawmidi_dev_free(struct snd_device *device)
1552 {
1553 struct snd_rawmidi *rmidi = device->device_data;
1554 return snd_rawmidi_free(rmidi);
1555 }
1556
1557 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1558 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1559 {
1560 struct snd_rawmidi *rmidi = device->private_data;
1561 rmidi->seq_dev = NULL;
1562 }
1563 #endif
1564
1565 static int snd_rawmidi_dev_register(struct snd_device *device)
1566 {
1567 int err;
1568 struct snd_info_entry *entry;
1569 char name[16];
1570 struct snd_rawmidi *rmidi = device->device_data;
1571
1572 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1573 return -ENOMEM;
1574 mutex_lock(&register_mutex);
1575 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1576 mutex_unlock(&register_mutex);
1577 return -EBUSY;
1578 }
1579 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1580 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1581 rmidi->card, rmidi->device,
1582 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1583 if (err < 0) {
1584 rmidi_err(rmidi, "unable to register\n");
1585 list_del(&rmidi->list);
1586 mutex_unlock(&register_mutex);
1587 return err;
1588 }
1589 if (rmidi->ops && rmidi->ops->dev_register &&
1590 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1591 snd_unregister_device(&rmidi->dev);
1592 list_del(&rmidi->list);
1593 mutex_unlock(&register_mutex);
1594 return err;
1595 }
1596 #ifdef CONFIG_SND_OSSEMUL
1597 rmidi->ossreg = 0;
1598 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1599 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1600 rmidi->card, 0, &snd_rawmidi_f_ops,
1601 rmidi) < 0) {
1602 rmidi_err(rmidi,
1603 "unable to register OSS rawmidi device %i:%i\n",
1604 rmidi->card->number, 0);
1605 } else {
1606 rmidi->ossreg++;
1607 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1608 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1609 #endif
1610 }
1611 }
1612 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1613 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1614 rmidi->card, 1, &snd_rawmidi_f_ops,
1615 rmidi) < 0) {
1616 rmidi_err(rmidi,
1617 "unable to register OSS rawmidi device %i:%i\n",
1618 rmidi->card->number, 1);
1619 } else {
1620 rmidi->ossreg++;
1621 }
1622 }
1623 #endif /* CONFIG_SND_OSSEMUL */
1624 mutex_unlock(&register_mutex);
1625 sprintf(name, "midi%d", rmidi->device);
1626 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1627 if (entry) {
1628 entry->private_data = rmidi;
1629 entry->c.text.read = snd_rawmidi_proc_info_read;
1630 if (snd_info_register(entry) < 0) {
1631 snd_info_free_entry(entry);
1632 entry = NULL;
1633 }
1634 }
1635 rmidi->proc_entry = entry;
1636 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1637 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1638 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1639 rmidi->seq_dev->private_data = rmidi;
1640 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1641 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1642 snd_device_register(rmidi->card, rmidi->seq_dev);
1643 }
1644 }
1645 #endif
1646 return 0;
1647 }
1648
1649 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1650 {
1651 struct snd_rawmidi *rmidi = device->device_data;
1652 int dir;
1653
1654 mutex_lock(&register_mutex);
1655 mutex_lock(&rmidi->open_mutex);
1656 wake_up(&rmidi->open_wait);
1657 list_del_init(&rmidi->list);
1658 for (dir = 0; dir < 2; dir++) {
1659 struct snd_rawmidi_substream *s;
1660 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1661 if (s->runtime)
1662 wake_up(&s->runtime->sleep);
1663 }
1664 }
1665
1666 #ifdef CONFIG_SND_OSSEMUL
1667 if (rmidi->ossreg) {
1668 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1669 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1670 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1671 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1672 #endif
1673 }
1674 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1675 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1676 rmidi->ossreg = 0;
1677 }
1678 #endif /* CONFIG_SND_OSSEMUL */
1679 snd_unregister_device(&rmidi->dev);
1680 mutex_unlock(&rmidi->open_mutex);
1681 mutex_unlock(&register_mutex);
1682 return 0;
1683 }
1684
1685 /**
1686 * snd_rawmidi_set_ops - set the rawmidi operators
1687 * @rmidi: the rawmidi instance
1688 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1689 * @ops: the operator table
1690 *
1691 * Sets the rawmidi operators for the given stream direction.
1692 */
1693 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1694 struct snd_rawmidi_ops *ops)
1695 {
1696 struct snd_rawmidi_substream *substream;
1697
1698 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1699 substream->ops = ops;
1700 }
1701 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1702
1703 /*
1704 * ENTRY functions
1705 */
1706
1707 static int __init alsa_rawmidi_init(void)
1708 {
1709
1710 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1711 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1712 #ifdef CONFIG_SND_OSSEMUL
1713 { int i;
1714 /* check device map table */
1715 for (i = 0; i < SNDRV_CARDS; i++) {
1716 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1717 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1718 i, midi_map[i]);
1719 midi_map[i] = 0;
1720 }
1721 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1722 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1723 i, amidi_map[i]);
1724 amidi_map[i] = 1;
1725 }
1726 }
1727 }
1728 #endif /* CONFIG_SND_OSSEMUL */
1729 return 0;
1730 }
1731
1732 static void __exit alsa_rawmidi_exit(void)
1733 {
1734 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1735 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1736 }
1737
1738 module_init(alsa_rawmidi_init)
1739 module_exit(alsa_rawmidi_exit)
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