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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Abstract layer for MIDI v1.0 stream
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <sound/core.h>
8#include <linux/major.h>
9#include <linux/init.h>
10#include <linux/sched/signal.h>
11#include <linux/slab.h>
12#include <linux/time.h>
13#include <linux/wait.h>
14#include <linux/mutex.h>
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/mm.h>
18#include <linux/nospec.h>
19#include <sound/rawmidi.h>
20#include <sound/info.h>
21#include <sound/control.h>
22#include <sound/minors.h>
23#include <sound/initval.h>
24
25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
26MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
27MODULE_LICENSE("GPL");
28
29#ifdef CONFIG_SND_OSSEMUL
30static int midi_map[SNDRV_CARDS];
31static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
32module_param_array(midi_map, int, NULL, 0444);
33MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
34module_param_array(amidi_map, int, NULL, 0444);
35MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
36#endif /* CONFIG_SND_OSSEMUL */
37
38static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
39static int snd_rawmidi_dev_free(struct snd_device *device);
40static int snd_rawmidi_dev_register(struct snd_device *device);
41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
42
43static LIST_HEAD(snd_rawmidi_devices);
44static DEFINE_MUTEX(register_mutex);
45
46#define rmidi_err(rmidi, fmt, args...) \
47 dev_err(&(rmidi)->dev, fmt, ##args)
48#define rmidi_warn(rmidi, fmt, args...) \
49 dev_warn(&(rmidi)->dev, fmt, ##args)
50#define rmidi_dbg(rmidi, fmt, args...) \
51 dev_dbg(&(rmidi)->dev, fmt, ##args)
52
53static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
54{
55 struct snd_rawmidi *rawmidi;
56
57 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
58 if (rawmidi->card == card && rawmidi->device == device)
59 return rawmidi;
60 return NULL;
61}
62
63static inline unsigned short snd_rawmidi_file_flags(struct file *file)
64{
65 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
66 case FMODE_WRITE:
67 return SNDRV_RAWMIDI_LFLG_OUTPUT;
68 case FMODE_READ:
69 return SNDRV_RAWMIDI_LFLG_INPUT;
70 default:
71 return SNDRV_RAWMIDI_LFLG_OPEN;
72 }
73}
74
75static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
76{
77 struct snd_rawmidi_runtime *runtime = substream->runtime;
78
79 return runtime->avail >= runtime->avail_min;
80}
81
82static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
83 size_t count)
84{
85 struct snd_rawmidi_runtime *runtime = substream->runtime;
86
87 return runtime->avail >= runtime->avail_min &&
88 (!substream->append || runtime->avail >= count);
89}
90
91static void snd_rawmidi_input_event_work(struct work_struct *work)
92{
93 struct snd_rawmidi_runtime *runtime =
94 container_of(work, struct snd_rawmidi_runtime, event_work);
95
96 if (runtime->event)
97 runtime->event(runtime->substream);
98}
99
100static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
101{
102 struct snd_rawmidi_runtime *runtime;
103
104 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
105 if (!runtime)
106 return -ENOMEM;
107 runtime->substream = substream;
108 spin_lock_init(&runtime->lock);
109 init_waitqueue_head(&runtime->sleep);
110 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
111 runtime->event = NULL;
112 runtime->buffer_size = PAGE_SIZE;
113 runtime->avail_min = 1;
114 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
115 runtime->avail = 0;
116 else
117 runtime->avail = runtime->buffer_size;
118 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
119 if (!runtime->buffer) {
120 kfree(runtime);
121 return -ENOMEM;
122 }
123 runtime->appl_ptr = runtime->hw_ptr = 0;
124 substream->runtime = runtime;
125 return 0;
126}
127
128static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
129{
130 struct snd_rawmidi_runtime *runtime = substream->runtime;
131
132 kvfree(runtime->buffer);
133 kfree(runtime);
134 substream->runtime = NULL;
135 return 0;
136}
137
138static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
139{
140 if (!substream->opened)
141 return;
142 substream->ops->trigger(substream, up);
143}
144
145static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
146{
147 if (!substream->opened)
148 return;
149 substream->ops->trigger(substream, up);
150 if (!up)
151 cancel_work_sync(&substream->runtime->event_work);
152}
153
154static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
155 bool is_input)
156{
157 runtime->drain = 0;
158 runtime->appl_ptr = runtime->hw_ptr = 0;
159 runtime->avail = is_input ? 0 : runtime->buffer_size;
160}
161
162static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
163 bool is_input)
164{
165 unsigned long flags;
166
167 spin_lock_irqsave(&runtime->lock, flags);
168 __reset_runtime_ptrs(runtime, is_input);
169 spin_unlock_irqrestore(&runtime->lock, flags);
170}
171
172int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
173{
174 snd_rawmidi_output_trigger(substream, 0);
175 reset_runtime_ptrs(substream->runtime, false);
176 return 0;
177}
178EXPORT_SYMBOL(snd_rawmidi_drop_output);
179
180int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
181{
182 int err;
183 long timeout;
184 struct snd_rawmidi_runtime *runtime = substream->runtime;
185
186 err = 0;
187 runtime->drain = 1;
188 timeout = wait_event_interruptible_timeout(runtime->sleep,
189 (runtime->avail >= runtime->buffer_size),
190 10*HZ);
191 if (signal_pending(current))
192 err = -ERESTARTSYS;
193 if (runtime->avail < runtime->buffer_size && !timeout) {
194 rmidi_warn(substream->rmidi,
195 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
196 (long)runtime->avail, (long)runtime->buffer_size);
197 err = -EIO;
198 }
199 runtime->drain = 0;
200 if (err != -ERESTARTSYS) {
201 /* we need wait a while to make sure that Tx FIFOs are empty */
202 if (substream->ops->drain)
203 substream->ops->drain(substream);
204 else
205 msleep(50);
206 snd_rawmidi_drop_output(substream);
207 }
208 return err;
209}
210EXPORT_SYMBOL(snd_rawmidi_drain_output);
211
212int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
213{
214 snd_rawmidi_input_trigger(substream, 0);
215 reset_runtime_ptrs(substream->runtime, true);
216 return 0;
217}
218EXPORT_SYMBOL(snd_rawmidi_drain_input);
219
220/* look for an available substream for the given stream direction;
221 * if a specific subdevice is given, try to assign it
222 */
223static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
224 int stream, int mode,
225 struct snd_rawmidi_substream **sub_ret)
226{
227 struct snd_rawmidi_substream *substream;
228 struct snd_rawmidi_str *s = &rmidi->streams[stream];
229 static unsigned int info_flags[2] = {
230 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
231 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
232 };
233
234 if (!(rmidi->info_flags & info_flags[stream]))
235 return -ENXIO;
236 if (subdevice >= 0 && subdevice >= s->substream_count)
237 return -ENODEV;
238
239 list_for_each_entry(substream, &s->substreams, list) {
240 if (substream->opened) {
241 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
242 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
243 !substream->append)
244 continue;
245 }
246 if (subdevice < 0 || subdevice == substream->number) {
247 *sub_ret = substream;
248 return 0;
249 }
250 }
251 return -EAGAIN;
252}
253
254/* open and do ref-counting for the given substream */
255static int open_substream(struct snd_rawmidi *rmidi,
256 struct snd_rawmidi_substream *substream,
257 int mode)
258{
259 int err;
260
261 if (substream->use_count == 0) {
262 err = snd_rawmidi_runtime_create(substream);
263 if (err < 0)
264 return err;
265 err = substream->ops->open(substream);
266 if (err < 0) {
267 snd_rawmidi_runtime_free(substream);
268 return err;
269 }
270 substream->opened = 1;
271 substream->active_sensing = 0;
272 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
273 substream->append = 1;
274 substream->pid = get_pid(task_pid(current));
275 rmidi->streams[substream->stream].substream_opened++;
276 }
277 substream->use_count++;
278 return 0;
279}
280
281static void close_substream(struct snd_rawmidi *rmidi,
282 struct snd_rawmidi_substream *substream,
283 int cleanup);
284
285static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
286 struct snd_rawmidi_file *rfile)
287{
288 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
289 int err;
290
291 rfile->input = rfile->output = NULL;
292 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
293 err = assign_substream(rmidi, subdevice,
294 SNDRV_RAWMIDI_STREAM_INPUT,
295 mode, &sinput);
296 if (err < 0)
297 return err;
298 }
299 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
300 err = assign_substream(rmidi, subdevice,
301 SNDRV_RAWMIDI_STREAM_OUTPUT,
302 mode, &soutput);
303 if (err < 0)
304 return err;
305 }
306
307 if (sinput) {
308 err = open_substream(rmidi, sinput, mode);
309 if (err < 0)
310 return err;
311 }
312 if (soutput) {
313 err = open_substream(rmidi, soutput, mode);
314 if (err < 0) {
315 if (sinput)
316 close_substream(rmidi, sinput, 0);
317 return err;
318 }
319 }
320
321 rfile->rmidi = rmidi;
322 rfile->input = sinput;
323 rfile->output = soutput;
324 return 0;
325}
326
327/* called from sound/core/seq/seq_midi.c */
328int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
329 int mode, struct snd_rawmidi_file *rfile)
330{
331 struct snd_rawmidi *rmidi;
332 int err = 0;
333
334 if (snd_BUG_ON(!rfile))
335 return -EINVAL;
336
337 mutex_lock(®ister_mutex);
338 rmidi = snd_rawmidi_search(card, device);
339 if (!rmidi)
340 err = -ENODEV;
341 else if (!try_module_get(rmidi->card->module))
342 err = -ENXIO;
343 mutex_unlock(®ister_mutex);
344 if (err < 0)
345 return err;
346
347 mutex_lock(&rmidi->open_mutex);
348 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
349 mutex_unlock(&rmidi->open_mutex);
350 if (err < 0)
351 module_put(rmidi->card->module);
352 return err;
353}
354EXPORT_SYMBOL(snd_rawmidi_kernel_open);
355
356static int snd_rawmidi_open(struct inode *inode, struct file *file)
357{
358 int maj = imajor(inode);
359 struct snd_card *card;
360 int subdevice;
361 unsigned short fflags;
362 int err;
363 struct snd_rawmidi *rmidi;
364 struct snd_rawmidi_file *rawmidi_file = NULL;
365 wait_queue_entry_t wait;
366
367 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
368 return -EINVAL; /* invalid combination */
369
370 err = stream_open(inode, file);
371 if (err < 0)
372 return err;
373
374 if (maj == snd_major) {
375 rmidi = snd_lookup_minor_data(iminor(inode),
376 SNDRV_DEVICE_TYPE_RAWMIDI);
377#ifdef CONFIG_SND_OSSEMUL
378 } else if (maj == SOUND_MAJOR) {
379 rmidi = snd_lookup_oss_minor_data(iminor(inode),
380 SNDRV_OSS_DEVICE_TYPE_MIDI);
381#endif
382 } else
383 return -ENXIO;
384
385 if (rmidi == NULL)
386 return -ENODEV;
387
388 if (!try_module_get(rmidi->card->module)) {
389 snd_card_unref(rmidi->card);
390 return -ENXIO;
391 }
392
393 mutex_lock(&rmidi->open_mutex);
394 card = rmidi->card;
395 err = snd_card_file_add(card, file);
396 if (err < 0)
397 goto __error_card;
398 fflags = snd_rawmidi_file_flags(file);
399 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
400 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
401 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
402 if (rawmidi_file == NULL) {
403 err = -ENOMEM;
404 goto __error;
405 }
406 init_waitqueue_entry(&wait, current);
407 add_wait_queue(&rmidi->open_wait, &wait);
408 while (1) {
409 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
410 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
411 if (err >= 0)
412 break;
413 if (err == -EAGAIN) {
414 if (file->f_flags & O_NONBLOCK) {
415 err = -EBUSY;
416 break;
417 }
418 } else
419 break;
420 set_current_state(TASK_INTERRUPTIBLE);
421 mutex_unlock(&rmidi->open_mutex);
422 schedule();
423 mutex_lock(&rmidi->open_mutex);
424 if (rmidi->card->shutdown) {
425 err = -ENODEV;
426 break;
427 }
428 if (signal_pending(current)) {
429 err = -ERESTARTSYS;
430 break;
431 }
432 }
433 remove_wait_queue(&rmidi->open_wait, &wait);
434 if (err < 0) {
435 kfree(rawmidi_file);
436 goto __error;
437 }
438#ifdef CONFIG_SND_OSSEMUL
439 if (rawmidi_file->input && rawmidi_file->input->runtime)
440 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
441 if (rawmidi_file->output && rawmidi_file->output->runtime)
442 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
443#endif
444 file->private_data = rawmidi_file;
445 mutex_unlock(&rmidi->open_mutex);
446 snd_card_unref(rmidi->card);
447 return 0;
448
449 __error:
450 snd_card_file_remove(card, file);
451 __error_card:
452 mutex_unlock(&rmidi->open_mutex);
453 module_put(rmidi->card->module);
454 snd_card_unref(rmidi->card);
455 return err;
456}
457
458static void close_substream(struct snd_rawmidi *rmidi,
459 struct snd_rawmidi_substream *substream,
460 int cleanup)
461{
462 if (--substream->use_count)
463 return;
464
465 if (cleanup) {
466 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
467 snd_rawmidi_input_trigger(substream, 0);
468 else {
469 if (substream->active_sensing) {
470 unsigned char buf = 0xfe;
471 /* sending single active sensing message
472 * to shut the device up
473 */
474 snd_rawmidi_kernel_write(substream, &buf, 1);
475 }
476 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
477 snd_rawmidi_output_trigger(substream, 0);
478 }
479 }
480 substream->ops->close(substream);
481 if (substream->runtime->private_free)
482 substream->runtime->private_free(substream);
483 snd_rawmidi_runtime_free(substream);
484 substream->opened = 0;
485 substream->append = 0;
486 put_pid(substream->pid);
487 substream->pid = NULL;
488 rmidi->streams[substream->stream].substream_opened--;
489}
490
491static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
492{
493 struct snd_rawmidi *rmidi;
494
495 rmidi = rfile->rmidi;
496 mutex_lock(&rmidi->open_mutex);
497 if (rfile->input) {
498 close_substream(rmidi, rfile->input, 1);
499 rfile->input = NULL;
500 }
501 if (rfile->output) {
502 close_substream(rmidi, rfile->output, 1);
503 rfile->output = NULL;
504 }
505 rfile->rmidi = NULL;
506 mutex_unlock(&rmidi->open_mutex);
507 wake_up(&rmidi->open_wait);
508}
509
510/* called from sound/core/seq/seq_midi.c */
511int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
512{
513 struct snd_rawmidi *rmidi;
514
515 if (snd_BUG_ON(!rfile))
516 return -ENXIO;
517
518 rmidi = rfile->rmidi;
519 rawmidi_release_priv(rfile);
520 module_put(rmidi->card->module);
521 return 0;
522}
523EXPORT_SYMBOL(snd_rawmidi_kernel_release);
524
525static int snd_rawmidi_release(struct inode *inode, struct file *file)
526{
527 struct snd_rawmidi_file *rfile;
528 struct snd_rawmidi *rmidi;
529 struct module *module;
530
531 rfile = file->private_data;
532 rmidi = rfile->rmidi;
533 rawmidi_release_priv(rfile);
534 kfree(rfile);
535 module = rmidi->card->module;
536 snd_card_file_remove(rmidi->card, file);
537 module_put(module);
538 return 0;
539}
540
541static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
542 struct snd_rawmidi_info *info)
543{
544 struct snd_rawmidi *rmidi;
545
546 if (substream == NULL)
547 return -ENODEV;
548 rmidi = substream->rmidi;
549 memset(info, 0, sizeof(*info));
550 info->card = rmidi->card->number;
551 info->device = rmidi->device;
552 info->subdevice = substream->number;
553 info->stream = substream->stream;
554 info->flags = rmidi->info_flags;
555 strcpy(info->id, rmidi->id);
556 strcpy(info->name, rmidi->name);
557 strcpy(info->subname, substream->name);
558 info->subdevices_count = substream->pstr->substream_count;
559 info->subdevices_avail = (substream->pstr->substream_count -
560 substream->pstr->substream_opened);
561 return 0;
562}
563
564static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
565 struct snd_rawmidi_info __user *_info)
566{
567 struct snd_rawmidi_info info;
568 int err;
569
570 err = snd_rawmidi_info(substream, &info);
571 if (err < 0)
572 return err;
573 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
574 return -EFAULT;
575 return 0;
576}
577
578static int __snd_rawmidi_info_select(struct snd_card *card,
579 struct snd_rawmidi_info *info)
580{
581 struct snd_rawmidi *rmidi;
582 struct snd_rawmidi_str *pstr;
583 struct snd_rawmidi_substream *substream;
584
585 rmidi = snd_rawmidi_search(card, info->device);
586 if (!rmidi)
587 return -ENXIO;
588 if (info->stream < 0 || info->stream > 1)
589 return -EINVAL;
590 info->stream = array_index_nospec(info->stream, 2);
591 pstr = &rmidi->streams[info->stream];
592 if (pstr->substream_count == 0)
593 return -ENOENT;
594 if (info->subdevice >= pstr->substream_count)
595 return -ENXIO;
596 list_for_each_entry(substream, &pstr->substreams, list) {
597 if ((unsigned int)substream->number == info->subdevice)
598 return snd_rawmidi_info(substream, info);
599 }
600 return -ENXIO;
601}
602
603int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
604{
605 int ret;
606
607 mutex_lock(®ister_mutex);
608 ret = __snd_rawmidi_info_select(card, info);
609 mutex_unlock(®ister_mutex);
610 return ret;
611}
612EXPORT_SYMBOL(snd_rawmidi_info_select);
613
614static int snd_rawmidi_info_select_user(struct snd_card *card,
615 struct snd_rawmidi_info __user *_info)
616{
617 int err;
618 struct snd_rawmidi_info info;
619
620 if (get_user(info.device, &_info->device))
621 return -EFAULT;
622 if (get_user(info.stream, &_info->stream))
623 return -EFAULT;
624 if (get_user(info.subdevice, &_info->subdevice))
625 return -EFAULT;
626 err = snd_rawmidi_info_select(card, &info);
627 if (err < 0)
628 return err;
629 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
630 return -EFAULT;
631 return 0;
632}
633
634static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
635 struct snd_rawmidi_params *params,
636 bool is_input)
637{
638 char *newbuf, *oldbuf;
639
640 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
641 return -EINVAL;
642 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
643 return -EINVAL;
644 if (params->buffer_size != runtime->buffer_size) {
645 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
646 if (!newbuf)
647 return -ENOMEM;
648 spin_lock_irq(&runtime->lock);
649 oldbuf = runtime->buffer;
650 runtime->buffer = newbuf;
651 runtime->buffer_size = params->buffer_size;
652 __reset_runtime_ptrs(runtime, is_input);
653 spin_unlock_irq(&runtime->lock);
654 kvfree(oldbuf);
655 }
656 runtime->avail_min = params->avail_min;
657 return 0;
658}
659
660int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
661 struct snd_rawmidi_params *params)
662{
663 if (substream->append && substream->use_count > 1)
664 return -EBUSY;
665 snd_rawmidi_drain_output(substream);
666 substream->active_sensing = !params->no_active_sensing;
667 return resize_runtime_buffer(substream->runtime, params, false);
668}
669EXPORT_SYMBOL(snd_rawmidi_output_params);
670
671int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
672 struct snd_rawmidi_params *params)
673{
674 snd_rawmidi_drain_input(substream);
675 return resize_runtime_buffer(substream->runtime, params, true);
676}
677EXPORT_SYMBOL(snd_rawmidi_input_params);
678
679static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
680 struct snd_rawmidi_status *status)
681{
682 struct snd_rawmidi_runtime *runtime = substream->runtime;
683
684 memset(status, 0, sizeof(*status));
685 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
686 spin_lock_irq(&runtime->lock);
687 status->avail = runtime->avail;
688 spin_unlock_irq(&runtime->lock);
689 return 0;
690}
691
692static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
693 struct snd_rawmidi_status *status)
694{
695 struct snd_rawmidi_runtime *runtime = substream->runtime;
696
697 memset(status, 0, sizeof(*status));
698 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
699 spin_lock_irq(&runtime->lock);
700 status->avail = runtime->avail;
701 status->xruns = runtime->xruns;
702 runtime->xruns = 0;
703 spin_unlock_irq(&runtime->lock);
704 return 0;
705}
706
707static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
708{
709 struct snd_rawmidi_file *rfile;
710 void __user *argp = (void __user *)arg;
711
712 rfile = file->private_data;
713 if (((cmd >> 8) & 0xff) != 'W')
714 return -ENOTTY;
715 switch (cmd) {
716 case SNDRV_RAWMIDI_IOCTL_PVERSION:
717 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
718 case SNDRV_RAWMIDI_IOCTL_INFO:
719 {
720 int stream;
721 struct snd_rawmidi_info __user *info = argp;
722
723 if (get_user(stream, &info->stream))
724 return -EFAULT;
725 switch (stream) {
726 case SNDRV_RAWMIDI_STREAM_INPUT:
727 return snd_rawmidi_info_user(rfile->input, info);
728 case SNDRV_RAWMIDI_STREAM_OUTPUT:
729 return snd_rawmidi_info_user(rfile->output, info);
730 default:
731 return -EINVAL;
732 }
733 }
734 case SNDRV_RAWMIDI_IOCTL_PARAMS:
735 {
736 struct snd_rawmidi_params params;
737
738 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
739 return -EFAULT;
740 switch (params.stream) {
741 case SNDRV_RAWMIDI_STREAM_OUTPUT:
742 if (rfile->output == NULL)
743 return -EINVAL;
744 return snd_rawmidi_output_params(rfile->output, ¶ms);
745 case SNDRV_RAWMIDI_STREAM_INPUT:
746 if (rfile->input == NULL)
747 return -EINVAL;
748 return snd_rawmidi_input_params(rfile->input, ¶ms);
749 default:
750 return -EINVAL;
751 }
752 }
753 case SNDRV_RAWMIDI_IOCTL_STATUS:
754 {
755 int err = 0;
756 struct snd_rawmidi_status status;
757
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759 return -EFAULT;
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
763 return -EINVAL;
764 err = snd_rawmidi_output_status(rfile->output, &status);
765 break;
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
768 return -EINVAL;
769 err = snd_rawmidi_input_status(rfile->input, &status);
770 break;
771 default:
772 return -EINVAL;
773 }
774 if (err < 0)
775 return err;
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
783
784 if (get_user(val, (int __user *) argp))
785 return -EFAULT;
786 switch (val) {
787 case SNDRV_RAWMIDI_STREAM_OUTPUT:
788 if (rfile->output == NULL)
789 return -EINVAL;
790 return snd_rawmidi_drop_output(rfile->output);
791 default:
792 return -EINVAL;
793 }
794 }
795 case SNDRV_RAWMIDI_IOCTL_DRAIN:
796 {
797 int val;
798
799 if (get_user(val, (int __user *) argp))
800 return -EFAULT;
801 switch (val) {
802 case SNDRV_RAWMIDI_STREAM_OUTPUT:
803 if (rfile->output == NULL)
804 return -EINVAL;
805 return snd_rawmidi_drain_output(rfile->output);
806 case SNDRV_RAWMIDI_STREAM_INPUT:
807 if (rfile->input == NULL)
808 return -EINVAL;
809 return snd_rawmidi_drain_input(rfile->input);
810 default:
811 return -EINVAL;
812 }
813 }
814 default:
815 rmidi_dbg(rfile->rmidi,
816 "rawmidi: unknown command = 0x%x\n", cmd);
817 }
818 return -ENOTTY;
819}
820
821static int snd_rawmidi_control_ioctl(struct snd_card *card,
822 struct snd_ctl_file *control,
823 unsigned int cmd,
824 unsigned long arg)
825{
826 void __user *argp = (void __user *)arg;
827
828 switch (cmd) {
829 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
830 {
831 int device;
832
833 if (get_user(device, (int __user *)argp))
834 return -EFAULT;
835 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
836 device = SNDRV_RAWMIDI_DEVICES - 1;
837 mutex_lock(®ister_mutex);
838 device = device < 0 ? 0 : device + 1;
839 while (device < SNDRV_RAWMIDI_DEVICES) {
840 if (snd_rawmidi_search(card, device))
841 break;
842 device++;
843 }
844 if (device == SNDRV_RAWMIDI_DEVICES)
845 device = -1;
846 mutex_unlock(®ister_mutex);
847 if (put_user(device, (int __user *)argp))
848 return -EFAULT;
849 return 0;
850 }
851 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
852 {
853 int val;
854
855 if (get_user(val, (int __user *)argp))
856 return -EFAULT;
857 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
858 return 0;
859 }
860 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
861 return snd_rawmidi_info_select_user(card, argp);
862 }
863 return -ENOIOCTLCMD;
864}
865
866/**
867 * snd_rawmidi_receive - receive the input data from the device
868 * @substream: the rawmidi substream
869 * @buffer: the buffer pointer
870 * @count: the data size to read
871 *
872 * Reads the data from the internal buffer.
873 *
874 * Return: The size of read data, or a negative error code on failure.
875 */
876int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
877 const unsigned char *buffer, int count)
878{
879 unsigned long flags;
880 int result = 0, count1;
881 struct snd_rawmidi_runtime *runtime = substream->runtime;
882
883 if (!substream->opened)
884 return -EBADFD;
885 if (runtime->buffer == NULL) {
886 rmidi_dbg(substream->rmidi,
887 "snd_rawmidi_receive: input is not active!!!\n");
888 return -EINVAL;
889 }
890 spin_lock_irqsave(&runtime->lock, flags);
891 if (count == 1) { /* special case, faster code */
892 substream->bytes++;
893 if (runtime->avail < runtime->buffer_size) {
894 runtime->buffer[runtime->hw_ptr++] = buffer[0];
895 runtime->hw_ptr %= runtime->buffer_size;
896 runtime->avail++;
897 result++;
898 } else {
899 runtime->xruns++;
900 }
901 } else {
902 substream->bytes += count;
903 count1 = runtime->buffer_size - runtime->hw_ptr;
904 if (count1 > count)
905 count1 = count;
906 if (count1 > (int)(runtime->buffer_size - runtime->avail))
907 count1 = runtime->buffer_size - runtime->avail;
908 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
909 runtime->hw_ptr += count1;
910 runtime->hw_ptr %= runtime->buffer_size;
911 runtime->avail += count1;
912 count -= count1;
913 result += count1;
914 if (count > 0) {
915 buffer += count1;
916 count1 = count;
917 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
918 count1 = runtime->buffer_size - runtime->avail;
919 runtime->xruns += count - count1;
920 }
921 if (count1 > 0) {
922 memcpy(runtime->buffer, buffer, count1);
923 runtime->hw_ptr = count1;
924 runtime->avail += count1;
925 result += count1;
926 }
927 }
928 }
929 if (result > 0) {
930 if (runtime->event)
931 schedule_work(&runtime->event_work);
932 else if (snd_rawmidi_ready(substream))
933 wake_up(&runtime->sleep);
934 }
935 spin_unlock_irqrestore(&runtime->lock, flags);
936 return result;
937}
938EXPORT_SYMBOL(snd_rawmidi_receive);
939
940static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
941 unsigned char __user *userbuf,
942 unsigned char *kernelbuf, long count)
943{
944 unsigned long flags;
945 long result = 0, count1;
946 struct snd_rawmidi_runtime *runtime = substream->runtime;
947 unsigned long appl_ptr;
948
949 spin_lock_irqsave(&runtime->lock, flags);
950 while (count > 0 && runtime->avail) {
951 count1 = runtime->buffer_size - runtime->appl_ptr;
952 if (count1 > count)
953 count1 = count;
954 if (count1 > (int)runtime->avail)
955 count1 = runtime->avail;
956
957 /* update runtime->appl_ptr before unlocking for userbuf */
958 appl_ptr = runtime->appl_ptr;
959 runtime->appl_ptr += count1;
960 runtime->appl_ptr %= runtime->buffer_size;
961 runtime->avail -= count1;
962
963 if (kernelbuf)
964 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
965 if (userbuf) {
966 spin_unlock_irqrestore(&runtime->lock, flags);
967 if (copy_to_user(userbuf + result,
968 runtime->buffer + appl_ptr, count1)) {
969 return result > 0 ? result : -EFAULT;
970 }
971 spin_lock_irqsave(&runtime->lock, flags);
972 }
973 result += count1;
974 count -= count1;
975 }
976 spin_unlock_irqrestore(&runtime->lock, flags);
977 return result;
978}
979
980long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
981 unsigned char *buf, long count)
982{
983 snd_rawmidi_input_trigger(substream, 1);
984 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
985}
986EXPORT_SYMBOL(snd_rawmidi_kernel_read);
987
988static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
989 loff_t *offset)
990{
991 long result;
992 int count1;
993 struct snd_rawmidi_file *rfile;
994 struct snd_rawmidi_substream *substream;
995 struct snd_rawmidi_runtime *runtime;
996
997 rfile = file->private_data;
998 substream = rfile->input;
999 if (substream == NULL)
1000 return -EIO;
1001 runtime = substream->runtime;
1002 snd_rawmidi_input_trigger(substream, 1);
1003 result = 0;
1004 while (count > 0) {
1005 spin_lock_irq(&runtime->lock);
1006 while (!snd_rawmidi_ready(substream)) {
1007 wait_queue_entry_t wait;
1008
1009 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1010 spin_unlock_irq(&runtime->lock);
1011 return result > 0 ? result : -EAGAIN;
1012 }
1013 init_waitqueue_entry(&wait, current);
1014 add_wait_queue(&runtime->sleep, &wait);
1015 set_current_state(TASK_INTERRUPTIBLE);
1016 spin_unlock_irq(&runtime->lock);
1017 schedule();
1018 remove_wait_queue(&runtime->sleep, &wait);
1019 if (rfile->rmidi->card->shutdown)
1020 return -ENODEV;
1021 if (signal_pending(current))
1022 return result > 0 ? result : -ERESTARTSYS;
1023 if (!runtime->avail)
1024 return result > 0 ? result : -EIO;
1025 spin_lock_irq(&runtime->lock);
1026 }
1027 spin_unlock_irq(&runtime->lock);
1028 count1 = snd_rawmidi_kernel_read1(substream,
1029 (unsigned char __user *)buf,
1030 NULL/*kernelbuf*/,
1031 count);
1032 if (count1 < 0)
1033 return result > 0 ? result : count1;
1034 result += count1;
1035 buf += count1;
1036 count -= count1;
1037 }
1038 return result;
1039}
1040
1041/**
1042 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1043 * @substream: the rawmidi substream
1044 *
1045 * Return: 1 if the internal output buffer is empty, 0 if not.
1046 */
1047int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1048{
1049 struct snd_rawmidi_runtime *runtime = substream->runtime;
1050 int result;
1051 unsigned long flags;
1052
1053 if (runtime->buffer == NULL) {
1054 rmidi_dbg(substream->rmidi,
1055 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1056 return 1;
1057 }
1058 spin_lock_irqsave(&runtime->lock, flags);
1059 result = runtime->avail >= runtime->buffer_size;
1060 spin_unlock_irqrestore(&runtime->lock, flags);
1061 return result;
1062}
1063EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1064
1065/**
1066 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1067 * @substream: the rawmidi substream
1068 * @buffer: the buffer pointer
1069 * @count: data size to transfer
1070 *
1071 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1072 */
1073int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1074 unsigned char *buffer, int count)
1075{
1076 int result, count1;
1077 struct snd_rawmidi_runtime *runtime = substream->runtime;
1078
1079 if (runtime->buffer == NULL) {
1080 rmidi_dbg(substream->rmidi,
1081 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1082 return -EINVAL;
1083 }
1084 result = 0;
1085 if (runtime->avail >= runtime->buffer_size) {
1086 /* warning: lowlevel layer MUST trigger down the hardware */
1087 goto __skip;
1088 }
1089 if (count == 1) { /* special case, faster code */
1090 *buffer = runtime->buffer[runtime->hw_ptr];
1091 result++;
1092 } else {
1093 count1 = runtime->buffer_size - runtime->hw_ptr;
1094 if (count1 > count)
1095 count1 = count;
1096 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1097 count1 = runtime->buffer_size - runtime->avail;
1098 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1099 count -= count1;
1100 result += count1;
1101 if (count > 0) {
1102 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1103 count = runtime->buffer_size - runtime->avail - count1;
1104 memcpy(buffer + count1, runtime->buffer, count);
1105 result += count;
1106 }
1107 }
1108 __skip:
1109 return result;
1110}
1111EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1112
1113/**
1114 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1115 * @substream: the rawmidi substream
1116 * @buffer: the buffer pointer
1117 * @count: data size to transfer
1118 *
1119 * Copies data from the internal output buffer to the given buffer.
1120 *
1121 * Call this in the interrupt handler when the midi output is ready,
1122 * and call snd_rawmidi_transmit_ack() after the transmission is
1123 * finished.
1124 *
1125 * Return: The size of copied data, or a negative error code on failure.
1126 */
1127int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1128 unsigned char *buffer, int count)
1129{
1130 struct snd_rawmidi_runtime *runtime = substream->runtime;
1131 int result;
1132 unsigned long flags;
1133
1134 spin_lock_irqsave(&runtime->lock, flags);
1135 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1136 spin_unlock_irqrestore(&runtime->lock, flags);
1137 return result;
1138}
1139EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1140
1141/**
1142 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1143 * @substream: the rawmidi substream
1144 * @count: the transferred count
1145 *
1146 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1147 */
1148int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1149{
1150 struct snd_rawmidi_runtime *runtime = substream->runtime;
1151
1152 if (runtime->buffer == NULL) {
1153 rmidi_dbg(substream->rmidi,
1154 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1155 return -EINVAL;
1156 }
1157 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1158 runtime->hw_ptr += count;
1159 runtime->hw_ptr %= runtime->buffer_size;
1160 runtime->avail += count;
1161 substream->bytes += count;
1162 if (count > 0) {
1163 if (runtime->drain || snd_rawmidi_ready(substream))
1164 wake_up(&runtime->sleep);
1165 }
1166 return count;
1167}
1168EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1169
1170/**
1171 * snd_rawmidi_transmit_ack - acknowledge the transmission
1172 * @substream: the rawmidi substream
1173 * @count: the transferred count
1174 *
1175 * Advances the hardware pointer for the internal output buffer with
1176 * the given size and updates the condition.
1177 * Call after the transmission is finished.
1178 *
1179 * Return: The advanced size if successful, or a negative error code on failure.
1180 */
1181int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1182{
1183 struct snd_rawmidi_runtime *runtime = substream->runtime;
1184 int result;
1185 unsigned long flags;
1186
1187 spin_lock_irqsave(&runtime->lock, flags);
1188 result = __snd_rawmidi_transmit_ack(substream, count);
1189 spin_unlock_irqrestore(&runtime->lock, flags);
1190 return result;
1191}
1192EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1193
1194/**
1195 * snd_rawmidi_transmit - copy from the buffer to the device
1196 * @substream: the rawmidi substream
1197 * @buffer: the buffer pointer
1198 * @count: the data size to transfer
1199 *
1200 * Copies data from the buffer to the device and advances the pointer.
1201 *
1202 * Return: The copied size if successful, or a negative error code on failure.
1203 */
1204int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1205 unsigned char *buffer, int count)
1206{
1207 struct snd_rawmidi_runtime *runtime = substream->runtime;
1208 int result;
1209 unsigned long flags;
1210
1211 spin_lock_irqsave(&runtime->lock, flags);
1212 if (!substream->opened)
1213 result = -EBADFD;
1214 else {
1215 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1216 if (count <= 0)
1217 result = count;
1218 else
1219 result = __snd_rawmidi_transmit_ack(substream, count);
1220 }
1221 spin_unlock_irqrestore(&runtime->lock, flags);
1222 return result;
1223}
1224EXPORT_SYMBOL(snd_rawmidi_transmit);
1225
1226/**
1227 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1228 * @substream: rawmidi substream
1229 *
1230 * Return: the number of discarded bytes
1231 */
1232int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1233{
1234 struct snd_rawmidi_runtime *runtime = substream->runtime;
1235 unsigned long flags;
1236 int count = 0;
1237
1238 spin_lock_irqsave(&runtime->lock, flags);
1239 if (runtime->avail < runtime->buffer_size) {
1240 count = runtime->buffer_size - runtime->avail;
1241 __snd_rawmidi_transmit_ack(substream, count);
1242 }
1243 spin_unlock_irqrestore(&runtime->lock, flags);
1244 return count;
1245}
1246EXPORT_SYMBOL(snd_rawmidi_proceed);
1247
1248static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1249 const unsigned char __user *userbuf,
1250 const unsigned char *kernelbuf,
1251 long count)
1252{
1253 unsigned long flags;
1254 long count1, result;
1255 struct snd_rawmidi_runtime *runtime = substream->runtime;
1256 unsigned long appl_ptr;
1257
1258 if (!kernelbuf && !userbuf)
1259 return -EINVAL;
1260 if (snd_BUG_ON(!runtime->buffer))
1261 return -EINVAL;
1262
1263 result = 0;
1264 spin_lock_irqsave(&runtime->lock, flags);
1265 if (substream->append) {
1266 if ((long)runtime->avail < count) {
1267 spin_unlock_irqrestore(&runtime->lock, flags);
1268 return -EAGAIN;
1269 }
1270 }
1271 while (count > 0 && runtime->avail > 0) {
1272 count1 = runtime->buffer_size - runtime->appl_ptr;
1273 if (count1 > count)
1274 count1 = count;
1275 if (count1 > (long)runtime->avail)
1276 count1 = runtime->avail;
1277
1278 /* update runtime->appl_ptr before unlocking for userbuf */
1279 appl_ptr = runtime->appl_ptr;
1280 runtime->appl_ptr += count1;
1281 runtime->appl_ptr %= runtime->buffer_size;
1282 runtime->avail -= count1;
1283
1284 if (kernelbuf)
1285 memcpy(runtime->buffer + appl_ptr,
1286 kernelbuf + result, count1);
1287 else if (userbuf) {
1288 spin_unlock_irqrestore(&runtime->lock, flags);
1289 if (copy_from_user(runtime->buffer + appl_ptr,
1290 userbuf + result, count1)) {
1291 spin_lock_irqsave(&runtime->lock, flags);
1292 result = result > 0 ? result : -EFAULT;
1293 goto __end;
1294 }
1295 spin_lock_irqsave(&runtime->lock, flags);
1296 }
1297 result += count1;
1298 count -= count1;
1299 }
1300 __end:
1301 count1 = runtime->avail < runtime->buffer_size;
1302 spin_unlock_irqrestore(&runtime->lock, flags);
1303 if (count1)
1304 snd_rawmidi_output_trigger(substream, 1);
1305 return result;
1306}
1307
1308long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1309 const unsigned char *buf, long count)
1310{
1311 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1312}
1313EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1314
1315static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1316 size_t count, loff_t *offset)
1317{
1318 long result, timeout;
1319 int count1;
1320 struct snd_rawmidi_file *rfile;
1321 struct snd_rawmidi_runtime *runtime;
1322 struct snd_rawmidi_substream *substream;
1323
1324 rfile = file->private_data;
1325 substream = rfile->output;
1326 runtime = substream->runtime;
1327 /* we cannot put an atomic message to our buffer */
1328 if (substream->append && count > runtime->buffer_size)
1329 return -EIO;
1330 result = 0;
1331 while (count > 0) {
1332 spin_lock_irq(&runtime->lock);
1333 while (!snd_rawmidi_ready_append(substream, count)) {
1334 wait_queue_entry_t wait;
1335
1336 if (file->f_flags & O_NONBLOCK) {
1337 spin_unlock_irq(&runtime->lock);
1338 return result > 0 ? result : -EAGAIN;
1339 }
1340 init_waitqueue_entry(&wait, current);
1341 add_wait_queue(&runtime->sleep, &wait);
1342 set_current_state(TASK_INTERRUPTIBLE);
1343 spin_unlock_irq(&runtime->lock);
1344 timeout = schedule_timeout(30 * HZ);
1345 remove_wait_queue(&runtime->sleep, &wait);
1346 if (rfile->rmidi->card->shutdown)
1347 return -ENODEV;
1348 if (signal_pending(current))
1349 return result > 0 ? result : -ERESTARTSYS;
1350 if (!runtime->avail && !timeout)
1351 return result > 0 ? result : -EIO;
1352 spin_lock_irq(&runtime->lock);
1353 }
1354 spin_unlock_irq(&runtime->lock);
1355 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1356 if (count1 < 0)
1357 return result > 0 ? result : count1;
1358 result += count1;
1359 buf += count1;
1360 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1361 break;
1362 count -= count1;
1363 }
1364 if (file->f_flags & O_DSYNC) {
1365 spin_lock_irq(&runtime->lock);
1366 while (runtime->avail != runtime->buffer_size) {
1367 wait_queue_entry_t wait;
1368 unsigned int last_avail = runtime->avail;
1369
1370 init_waitqueue_entry(&wait, current);
1371 add_wait_queue(&runtime->sleep, &wait);
1372 set_current_state(TASK_INTERRUPTIBLE);
1373 spin_unlock_irq(&runtime->lock);
1374 timeout = schedule_timeout(30 * HZ);
1375 remove_wait_queue(&runtime->sleep, &wait);
1376 if (signal_pending(current))
1377 return result > 0 ? result : -ERESTARTSYS;
1378 if (runtime->avail == last_avail && !timeout)
1379 return result > 0 ? result : -EIO;
1380 spin_lock_irq(&runtime->lock);
1381 }
1382 spin_unlock_irq(&runtime->lock);
1383 }
1384 return result;
1385}
1386
1387static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1388{
1389 struct snd_rawmidi_file *rfile;
1390 struct snd_rawmidi_runtime *runtime;
1391 __poll_t mask;
1392
1393 rfile = file->private_data;
1394 if (rfile->input != NULL) {
1395 runtime = rfile->input->runtime;
1396 snd_rawmidi_input_trigger(rfile->input, 1);
1397 poll_wait(file, &runtime->sleep, wait);
1398 }
1399 if (rfile->output != NULL) {
1400 runtime = rfile->output->runtime;
1401 poll_wait(file, &runtime->sleep, wait);
1402 }
1403 mask = 0;
1404 if (rfile->input != NULL) {
1405 if (snd_rawmidi_ready(rfile->input))
1406 mask |= EPOLLIN | EPOLLRDNORM;
1407 }
1408 if (rfile->output != NULL) {
1409 if (snd_rawmidi_ready(rfile->output))
1410 mask |= EPOLLOUT | EPOLLWRNORM;
1411 }
1412 return mask;
1413}
1414
1415/*
1416 */
1417#ifdef CONFIG_COMPAT
1418#include "rawmidi_compat.c"
1419#else
1420#define snd_rawmidi_ioctl_compat NULL
1421#endif
1422
1423/*
1424 */
1425
1426static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1427 struct snd_info_buffer *buffer)
1428{
1429 struct snd_rawmidi *rmidi;
1430 struct snd_rawmidi_substream *substream;
1431 struct snd_rawmidi_runtime *runtime;
1432
1433 rmidi = entry->private_data;
1434 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1435 mutex_lock(&rmidi->open_mutex);
1436 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1437 list_for_each_entry(substream,
1438 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1439 list) {
1440 snd_iprintf(buffer,
1441 "Output %d\n"
1442 " Tx bytes : %lu\n",
1443 substream->number,
1444 (unsigned long) substream->bytes);
1445 if (substream->opened) {
1446 snd_iprintf(buffer,
1447 " Owner PID : %d\n",
1448 pid_vnr(substream->pid));
1449 runtime = substream->runtime;
1450 snd_iprintf(buffer,
1451 " Mode : %s\n"
1452 " Buffer size : %lu\n"
1453 " Avail : %lu\n",
1454 runtime->oss ? "OSS compatible" : "native",
1455 (unsigned long) runtime->buffer_size,
1456 (unsigned long) runtime->avail);
1457 }
1458 }
1459 }
1460 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1461 list_for_each_entry(substream,
1462 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1463 list) {
1464 snd_iprintf(buffer,
1465 "Input %d\n"
1466 " Rx bytes : %lu\n",
1467 substream->number,
1468 (unsigned long) substream->bytes);
1469 if (substream->opened) {
1470 snd_iprintf(buffer,
1471 " Owner PID : %d\n",
1472 pid_vnr(substream->pid));
1473 runtime = substream->runtime;
1474 snd_iprintf(buffer,
1475 " Buffer size : %lu\n"
1476 " Avail : %lu\n"
1477 " Overruns : %lu\n",
1478 (unsigned long) runtime->buffer_size,
1479 (unsigned long) runtime->avail,
1480 (unsigned long) runtime->xruns);
1481 }
1482 }
1483 }
1484 mutex_unlock(&rmidi->open_mutex);
1485}
1486
1487/*
1488 * Register functions
1489 */
1490
1491static const struct file_operations snd_rawmidi_f_ops = {
1492 .owner = THIS_MODULE,
1493 .read = snd_rawmidi_read,
1494 .write = snd_rawmidi_write,
1495 .open = snd_rawmidi_open,
1496 .release = snd_rawmidi_release,
1497 .llseek = no_llseek,
1498 .poll = snd_rawmidi_poll,
1499 .unlocked_ioctl = snd_rawmidi_ioctl,
1500 .compat_ioctl = snd_rawmidi_ioctl_compat,
1501};
1502
1503static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1504 struct snd_rawmidi_str *stream,
1505 int direction,
1506 int count)
1507{
1508 struct snd_rawmidi_substream *substream;
1509 int idx;
1510
1511 for (idx = 0; idx < count; idx++) {
1512 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1513 if (!substream)
1514 return -ENOMEM;
1515 substream->stream = direction;
1516 substream->number = idx;
1517 substream->rmidi = rmidi;
1518 substream->pstr = stream;
1519 list_add_tail(&substream->list, &stream->substreams);
1520 stream->substream_count++;
1521 }
1522 return 0;
1523}
1524
1525static void release_rawmidi_device(struct device *dev)
1526{
1527 kfree(container_of(dev, struct snd_rawmidi, dev));
1528}
1529
1530/**
1531 * snd_rawmidi_new - create a rawmidi instance
1532 * @card: the card instance
1533 * @id: the id string
1534 * @device: the device index
1535 * @output_count: the number of output streams
1536 * @input_count: the number of input streams
1537 * @rrawmidi: the pointer to store the new rawmidi instance
1538 *
1539 * Creates a new rawmidi instance.
1540 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1541 *
1542 * Return: Zero if successful, or a negative error code on failure.
1543 */
1544int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1545 int output_count, int input_count,
1546 struct snd_rawmidi **rrawmidi)
1547{
1548 struct snd_rawmidi *rmidi;
1549 int err;
1550 static struct snd_device_ops ops = {
1551 .dev_free = snd_rawmidi_dev_free,
1552 .dev_register = snd_rawmidi_dev_register,
1553 .dev_disconnect = snd_rawmidi_dev_disconnect,
1554 };
1555
1556 if (snd_BUG_ON(!card))
1557 return -ENXIO;
1558 if (rrawmidi)
1559 *rrawmidi = NULL;
1560 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1561 if (!rmidi)
1562 return -ENOMEM;
1563 rmidi->card = card;
1564 rmidi->device = device;
1565 mutex_init(&rmidi->open_mutex);
1566 init_waitqueue_head(&rmidi->open_wait);
1567 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1568 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1569
1570 if (id != NULL)
1571 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1572
1573 snd_device_initialize(&rmidi->dev, card);
1574 rmidi->dev.release = release_rawmidi_device;
1575 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1576
1577 err = snd_rawmidi_alloc_substreams(rmidi,
1578 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1579 SNDRV_RAWMIDI_STREAM_INPUT,
1580 input_count);
1581 if (err < 0)
1582 goto error;
1583 err = snd_rawmidi_alloc_substreams(rmidi,
1584 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1585 SNDRV_RAWMIDI_STREAM_OUTPUT,
1586 output_count);
1587 if (err < 0)
1588 goto error;
1589 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1590 if (err < 0)
1591 goto error;
1592
1593 if (rrawmidi)
1594 *rrawmidi = rmidi;
1595 return 0;
1596
1597 error:
1598 snd_rawmidi_free(rmidi);
1599 return err;
1600}
1601EXPORT_SYMBOL(snd_rawmidi_new);
1602
1603static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1604{
1605 struct snd_rawmidi_substream *substream;
1606
1607 while (!list_empty(&stream->substreams)) {
1608 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1609 list_del(&substream->list);
1610 kfree(substream);
1611 }
1612}
1613
1614static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1615{
1616 if (!rmidi)
1617 return 0;
1618
1619 snd_info_free_entry(rmidi->proc_entry);
1620 rmidi->proc_entry = NULL;
1621 mutex_lock(®ister_mutex);
1622 if (rmidi->ops && rmidi->ops->dev_unregister)
1623 rmidi->ops->dev_unregister(rmidi);
1624 mutex_unlock(®ister_mutex);
1625
1626 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1627 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1628 if (rmidi->private_free)
1629 rmidi->private_free(rmidi);
1630 put_device(&rmidi->dev);
1631 return 0;
1632}
1633
1634static int snd_rawmidi_dev_free(struct snd_device *device)
1635{
1636 struct snd_rawmidi *rmidi = device->device_data;
1637
1638 return snd_rawmidi_free(rmidi);
1639}
1640
1641#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1642static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1643{
1644 struct snd_rawmidi *rmidi = device->private_data;
1645
1646 rmidi->seq_dev = NULL;
1647}
1648#endif
1649
1650static int snd_rawmidi_dev_register(struct snd_device *device)
1651{
1652 int err;
1653 struct snd_info_entry *entry;
1654 char name[16];
1655 struct snd_rawmidi *rmidi = device->device_data;
1656
1657 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1658 return -ENOMEM;
1659 err = 0;
1660 mutex_lock(®ister_mutex);
1661 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1662 err = -EBUSY;
1663 else
1664 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1665 mutex_unlock(®ister_mutex);
1666 if (err < 0)
1667 return err;
1668
1669 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1670 rmidi->card, rmidi->device,
1671 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1672 if (err < 0) {
1673 rmidi_err(rmidi, "unable to register\n");
1674 goto error;
1675 }
1676 if (rmidi->ops && rmidi->ops->dev_register) {
1677 err = rmidi->ops->dev_register(rmidi);
1678 if (err < 0)
1679 goto error_unregister;
1680 }
1681#ifdef CONFIG_SND_OSSEMUL
1682 rmidi->ossreg = 0;
1683 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1684 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1685 rmidi->card, 0, &snd_rawmidi_f_ops,
1686 rmidi) < 0) {
1687 rmidi_err(rmidi,
1688 "unable to register OSS rawmidi device %i:%i\n",
1689 rmidi->card->number, 0);
1690 } else {
1691 rmidi->ossreg++;
1692#ifdef SNDRV_OSS_INFO_DEV_MIDI
1693 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1694#endif
1695 }
1696 }
1697 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1698 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1699 rmidi->card, 1, &snd_rawmidi_f_ops,
1700 rmidi) < 0) {
1701 rmidi_err(rmidi,
1702 "unable to register OSS rawmidi device %i:%i\n",
1703 rmidi->card->number, 1);
1704 } else {
1705 rmidi->ossreg++;
1706 }
1707 }
1708#endif /* CONFIG_SND_OSSEMUL */
1709 sprintf(name, "midi%d", rmidi->device);
1710 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1711 if (entry) {
1712 entry->private_data = rmidi;
1713 entry->c.text.read = snd_rawmidi_proc_info_read;
1714 if (snd_info_register(entry) < 0) {
1715 snd_info_free_entry(entry);
1716 entry = NULL;
1717 }
1718 }
1719 rmidi->proc_entry = entry;
1720#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1721 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1722 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1723 rmidi->seq_dev->private_data = rmidi;
1724 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1725 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1726 snd_device_register(rmidi->card, rmidi->seq_dev);
1727 }
1728 }
1729#endif
1730 return 0;
1731
1732 error_unregister:
1733 snd_unregister_device(&rmidi->dev);
1734 error:
1735 mutex_lock(®ister_mutex);
1736 list_del(&rmidi->list);
1737 mutex_unlock(®ister_mutex);
1738 return err;
1739}
1740
1741static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1742{
1743 struct snd_rawmidi *rmidi = device->device_data;
1744 int dir;
1745
1746 mutex_lock(®ister_mutex);
1747 mutex_lock(&rmidi->open_mutex);
1748 wake_up(&rmidi->open_wait);
1749 list_del_init(&rmidi->list);
1750 for (dir = 0; dir < 2; dir++) {
1751 struct snd_rawmidi_substream *s;
1752
1753 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1754 if (s->runtime)
1755 wake_up(&s->runtime->sleep);
1756 }
1757 }
1758
1759#ifdef CONFIG_SND_OSSEMUL
1760 if (rmidi->ossreg) {
1761 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1762 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1763#ifdef SNDRV_OSS_INFO_DEV_MIDI
1764 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1765#endif
1766 }
1767 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1768 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1769 rmidi->ossreg = 0;
1770 }
1771#endif /* CONFIG_SND_OSSEMUL */
1772 snd_unregister_device(&rmidi->dev);
1773 mutex_unlock(&rmidi->open_mutex);
1774 mutex_unlock(®ister_mutex);
1775 return 0;
1776}
1777
1778/**
1779 * snd_rawmidi_set_ops - set the rawmidi operators
1780 * @rmidi: the rawmidi instance
1781 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1782 * @ops: the operator table
1783 *
1784 * Sets the rawmidi operators for the given stream direction.
1785 */
1786void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1787 const struct snd_rawmidi_ops *ops)
1788{
1789 struct snd_rawmidi_substream *substream;
1790
1791 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1792 substream->ops = ops;
1793}
1794EXPORT_SYMBOL(snd_rawmidi_set_ops);
1795
1796/*
1797 * ENTRY functions
1798 */
1799
1800static int __init alsa_rawmidi_init(void)
1801{
1802
1803 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1804 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1805#ifdef CONFIG_SND_OSSEMUL
1806 { int i;
1807 /* check device map table */
1808 for (i = 0; i < SNDRV_CARDS; i++) {
1809 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1810 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1811 i, midi_map[i]);
1812 midi_map[i] = 0;
1813 }
1814 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1815 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1816 i, amidi_map[i]);
1817 amidi_map[i] = 1;
1818 }
1819 }
1820 }
1821#endif /* CONFIG_SND_OSSEMUL */
1822 return 0;
1823}
1824
1825static void __exit alsa_rawmidi_exit(void)
1826{
1827 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1828 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1829}
1830
1831module_init(alsa_rawmidi_init)
1832module_exit(alsa_rawmidi_exit)
1/*
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
38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40MODULE_LICENSE("GPL");
41
42#ifdef CONFIG_SND_OSSEMUL
43static int midi_map[SNDRV_CARDS];
44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45module_param_array(midi_map, int, NULL, 0444);
46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47module_param_array(amidi_map, int, NULL, 0444);
48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49#endif /* CONFIG_SND_OSSEMUL */
50
51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52static int snd_rawmidi_dev_free(struct snd_device *device);
53static int snd_rawmidi_dev_register(struct snd_device *device);
54static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56static LIST_HEAD(snd_rawmidi_devices);
57static 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
66static 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
76static 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
88static 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
94static 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
102static 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
110static 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
136static 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
146static 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
153static 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
162int 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}
175EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177int 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}
207EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209int 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}
222EXPORT_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 */
227static 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 */
259static 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
285static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289static 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 */
332int 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(®ister_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(®ister_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(®ister_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(®ister_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}
360EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362static 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
464static 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
497static 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 */
517int 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}
529EXPORT_SYMBOL(snd_rawmidi_kernel_release);
530
531static 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
547static 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
570static 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
582static 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
606int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
607{
608 int ret;
609
610 mutex_lock(®ister_mutex);
611 ret = __snd_rawmidi_info_select(card, info);
612 mutex_unlock(®ister_mutex);
613 return ret;
614}
615EXPORT_SYMBOL(snd_rawmidi_info_select);
616
617static 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
635int 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}
663EXPORT_SYMBOL(snd_rawmidi_output_params);
664
665int 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}
689EXPORT_SYMBOL(snd_rawmidi_input_params);
690
691static 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
704static 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
719static 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(¶ms, 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, ¶ms);
755 case SNDRV_RAWMIDI_STREAM_INPUT:
756 if (rfile->input == NULL)
757 return -EINVAL;
758 return snd_rawmidi_input_params(rfile->input, ¶ms);
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
828static 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(®ister_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(®ister_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 */
883int 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}
945EXPORT_SYMBOL(snd_rawmidi_receive);
946
947static 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
987long 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}
993EXPORT_SYMBOL(snd_rawmidi_kernel_read);
994
995static 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 */
1053int 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}
1069EXPORT_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 */
1079int __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}
1117EXPORT_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 */
1133int 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}
1145EXPORT_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 */
1154int __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}
1174EXPORT_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 */
1187int 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}
1198EXPORT_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 */
1210int 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}
1230EXPORT_SYMBOL(snd_rawmidi_transmit);
1231
1232static 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
1292long 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}
1297EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1298
1299static 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
1369static __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
1409static 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
1474static 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
1487static 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
1509static 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 */
1528int 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}
1583EXPORT_SYMBOL(snd_rawmidi_new);
1584
1585static 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
1596static 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(®ister_mutex);
1604 if (rmidi->ops && rmidi->ops->dev_unregister)
1605 rmidi->ops->dev_unregister(rmidi);
1606 mutex_unlock(®ister_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
1616static 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)
1623static 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
1630static 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(®ister_mutex);
1640 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1641 mutex_unlock(®ister_mutex);
1642 return -EBUSY;
1643 }
1644 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1645 mutex_unlock(®ister_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(®ister_mutex);
1652 list_del(&rmidi->list);
1653 mutex_unlock(®ister_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(®ister_mutex);
1660 list_del(&rmidi->list);
1661 mutex_unlock(®ister_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
1716static 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(®ister_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(®ister_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 */
1760void 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}
1768EXPORT_SYMBOL(snd_rawmidi_set_ops);
1769
1770/*
1771 * ENTRY functions
1772 */
1773
1774static 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
1799static 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
1805module_init(alsa_rawmidi_init)
1806module_exit(alsa_rawmidi_exit)