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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.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_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
582int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
583{
584 struct snd_rawmidi *rmidi;
585 struct snd_rawmidi_str *pstr;
586 struct snd_rawmidi_substream *substream;
587
588 mutex_lock(®ister_mutex);
589 rmidi = snd_rawmidi_search(card, info->device);
590 mutex_unlock(®ister_mutex);
591 if (!rmidi)
592 return -ENXIO;
593 if (info->stream < 0 || info->stream > 1)
594 return -EINVAL;
595 pstr = &rmidi->streams[info->stream];
596 if (pstr->substream_count == 0)
597 return -ENOENT;
598 if (info->subdevice >= pstr->substream_count)
599 return -ENXIO;
600 list_for_each_entry(substream, &pstr->substreams, list) {
601 if ((unsigned int)substream->number == info->subdevice)
602 return snd_rawmidi_info(substream, info);
603 }
604 return -ENXIO;
605}
606EXPORT_SYMBOL(snd_rawmidi_info_select);
607
608static int snd_rawmidi_info_select_user(struct snd_card *card,
609 struct snd_rawmidi_info __user *_info)
610{
611 int err;
612 struct snd_rawmidi_info info;
613 if (get_user(info.device, &_info->device))
614 return -EFAULT;
615 if (get_user(info.stream, &_info->stream))
616 return -EFAULT;
617 if (get_user(info.subdevice, &_info->subdevice))
618 return -EFAULT;
619 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
620 return err;
621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
622 return -EFAULT;
623 return 0;
624}
625
626int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
627 struct snd_rawmidi_params * params)
628{
629 char *newbuf;
630 struct snd_rawmidi_runtime *runtime = substream->runtime;
631
632 if (substream->append && substream->use_count > 1)
633 return -EBUSY;
634 snd_rawmidi_drain_output(substream);
635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
636 return -EINVAL;
637 }
638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
639 return -EINVAL;
640 }
641 if (params->buffer_size != runtime->buffer_size) {
642 newbuf = krealloc(runtime->buffer, params->buffer_size,
643 GFP_KERNEL);
644 if (!newbuf)
645 return -ENOMEM;
646 runtime->buffer = newbuf;
647 runtime->buffer_size = params->buffer_size;
648 runtime->avail = runtime->buffer_size;
649 }
650 runtime->avail_min = params->avail_min;
651 substream->active_sensing = !params->no_active_sensing;
652 return 0;
653}
654EXPORT_SYMBOL(snd_rawmidi_output_params);
655
656int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
657 struct snd_rawmidi_params * params)
658{
659 char *newbuf;
660 struct snd_rawmidi_runtime *runtime = substream->runtime;
661
662 snd_rawmidi_drain_input(substream);
663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
664 return -EINVAL;
665 }
666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
667 return -EINVAL;
668 }
669 if (params->buffer_size != runtime->buffer_size) {
670 newbuf = krealloc(runtime->buffer, params->buffer_size,
671 GFP_KERNEL);
672 if (!newbuf)
673 return -ENOMEM;
674 runtime->buffer = newbuf;
675 runtime->buffer_size = params->buffer_size;
676 }
677 runtime->avail_min = params->avail_min;
678 return 0;
679}
680EXPORT_SYMBOL(snd_rawmidi_input_params);
681
682static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683 struct snd_rawmidi_status * status)
684{
685 struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687 memset(status, 0, sizeof(*status));
688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693}
694
695static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696 struct snd_rawmidi_status * status)
697{
698 struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700 memset(status, 0, sizeof(*status));
701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702 spin_lock_irq(&runtime->lock);
703 status->avail = runtime->avail;
704 status->xruns = runtime->xruns;
705 runtime->xruns = 0;
706 spin_unlock_irq(&runtime->lock);
707 return 0;
708}
709
710static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711{
712 struct snd_rawmidi_file *rfile;
713 void __user *argp = (void __user *)arg;
714
715 rfile = file->private_data;
716 if (((cmd >> 8) & 0xff) != 'W')
717 return -ENOTTY;
718 switch (cmd) {
719 case SNDRV_RAWMIDI_IOCTL_PVERSION:
720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721 case SNDRV_RAWMIDI_IOCTL_INFO:
722 {
723 int stream;
724 struct snd_rawmidi_info __user *info = argp;
725 if (get_user(stream, &info->stream))
726 return -EFAULT;
727 switch (stream) {
728 case SNDRV_RAWMIDI_STREAM_INPUT:
729 return snd_rawmidi_info_user(rfile->input, info);
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 return snd_rawmidi_info_user(rfile->output, info);
732 default:
733 return -EINVAL;
734 }
735 }
736 case SNDRV_RAWMIDI_IOCTL_PARAMS:
737 {
738 struct snd_rawmidi_params params;
739 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
740 return -EFAULT;
741 switch (params.stream) {
742 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743 if (rfile->output == NULL)
744 return -EINVAL;
745 return snd_rawmidi_output_params(rfile->output, ¶ms);
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 return snd_rawmidi_input_params(rfile->input, ¶ms);
750 default:
751 return -EINVAL;
752 }
753 }
754 case SNDRV_RAWMIDI_IOCTL_STATUS:
755 {
756 int err = 0;
757 struct snd_rawmidi_status status;
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759 return -EFAULT;
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
763 return -EINVAL;
764 err = snd_rawmidi_output_status(rfile->output, &status);
765 break;
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
768 return -EINVAL;
769 err = snd_rawmidi_input_status(rfile->input, &status);
770 break;
771 default:
772 return -EINVAL;
773 }
774 if (err < 0)
775 return err;
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
783 if (get_user(val, (int __user *) argp))
784 return -EFAULT;
785 switch (val) {
786 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787 if (rfile->output == NULL)
788 return -EINVAL;
789 return snd_rawmidi_drop_output(rfile->output);
790 default:
791 return -EINVAL;
792 }
793 }
794 case SNDRV_RAWMIDI_IOCTL_DRAIN:
795 {
796 int val;
797 if (get_user(val, (int __user *) argp))
798 return -EFAULT;
799 switch (val) {
800 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801 if (rfile->output == NULL)
802 return -EINVAL;
803 return snd_rawmidi_drain_output(rfile->output);
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 return snd_rawmidi_drain_input(rfile->input);
808 default:
809 return -EINVAL;
810 }
811 }
812 default:
813 rmidi_dbg(rfile->rmidi,
814 "rawmidi: unknown command = 0x%x\n", cmd);
815 }
816 return -ENOTTY;
817}
818
819static int snd_rawmidi_control_ioctl(struct snd_card *card,
820 struct snd_ctl_file *control,
821 unsigned int cmd,
822 unsigned long arg)
823{
824 void __user *argp = (void __user *)arg;
825
826 switch (cmd) {
827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
828 {
829 int device;
830
831 if (get_user(device, (int __user *)argp))
832 return -EFAULT;
833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
834 device = SNDRV_RAWMIDI_DEVICES - 1;
835 mutex_lock(®ister_mutex);
836 device = device < 0 ? 0 : device + 1;
837 while (device < SNDRV_RAWMIDI_DEVICES) {
838 if (snd_rawmidi_search(card, device))
839 break;
840 device++;
841 }
842 if (device == SNDRV_RAWMIDI_DEVICES)
843 device = -1;
844 mutex_unlock(®ister_mutex);
845 if (put_user(device, (int __user *)argp))
846 return -EFAULT;
847 return 0;
848 }
849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
850 {
851 int val;
852
853 if (get_user(val, (int __user *)argp))
854 return -EFAULT;
855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
859 return snd_rawmidi_info_select_user(card, argp);
860 }
861 return -ENOIOCTLCMD;
862}
863
864/**
865 * snd_rawmidi_receive - receive the input data from the device
866 * @substream: the rawmidi substream
867 * @buffer: the buffer pointer
868 * @count: the data size to read
869 *
870 * Reads the data from the internal buffer.
871 *
872 * Return: The size of read data, or a negative error code on failure.
873 */
874int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
875 const unsigned char *buffer, int count)
876{
877 unsigned long flags;
878 int result = 0, count1;
879 struct snd_rawmidi_runtime *runtime = substream->runtime;
880
881 if (!substream->opened)
882 return -EBADFD;
883 if (runtime->buffer == NULL) {
884 rmidi_dbg(substream->rmidi,
885 "snd_rawmidi_receive: input is not active!!!\n");
886 return -EINVAL;
887 }
888 spin_lock_irqsave(&runtime->lock, flags);
889 if (count == 1) { /* special case, faster code */
890 substream->bytes++;
891 if (runtime->avail < runtime->buffer_size) {
892 runtime->buffer[runtime->hw_ptr++] = buffer[0];
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail++;
895 result++;
896 } else {
897 runtime->xruns++;
898 }
899 } else {
900 substream->bytes += count;
901 count1 = runtime->buffer_size - runtime->hw_ptr;
902 if (count1 > count)
903 count1 = count;
904 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905 count1 = runtime->buffer_size - runtime->avail;
906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907 runtime->hw_ptr += count1;
908 runtime->hw_ptr %= runtime->buffer_size;
909 runtime->avail += count1;
910 count -= count1;
911 result += count1;
912 if (count > 0) {
913 buffer += count1;
914 count1 = count;
915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916 count1 = runtime->buffer_size - runtime->avail;
917 runtime->xruns += count - count1;
918 }
919 if (count1 > 0) {
920 memcpy(runtime->buffer, buffer, count1);
921 runtime->hw_ptr = count1;
922 runtime->avail += count1;
923 result += count1;
924 }
925 }
926 }
927 if (result > 0) {
928 if (runtime->event)
929 schedule_work(&runtime->event_work);
930 else if (snd_rawmidi_ready(substream))
931 wake_up(&runtime->sleep);
932 }
933 spin_unlock_irqrestore(&runtime->lock, flags);
934 return result;
935}
936EXPORT_SYMBOL(snd_rawmidi_receive);
937
938static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
939 unsigned char __user *userbuf,
940 unsigned char *kernelbuf, long count)
941{
942 unsigned long flags;
943 long result = 0, count1;
944 struct snd_rawmidi_runtime *runtime = substream->runtime;
945 unsigned long appl_ptr;
946
947 spin_lock_irqsave(&runtime->lock, flags);
948 while (count > 0 && runtime->avail) {
949 count1 = runtime->buffer_size - runtime->appl_ptr;
950 if (count1 > count)
951 count1 = count;
952 if (count1 > (int)runtime->avail)
953 count1 = runtime->avail;
954
955 /* update runtime->appl_ptr before unlocking for userbuf */
956 appl_ptr = runtime->appl_ptr;
957 runtime->appl_ptr += count1;
958 runtime->appl_ptr %= runtime->buffer_size;
959 runtime->avail -= count1;
960
961 if (kernelbuf)
962 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
963 if (userbuf) {
964 spin_unlock_irqrestore(&runtime->lock, flags);
965 if (copy_to_user(userbuf + result,
966 runtime->buffer + appl_ptr, count1)) {
967 return result > 0 ? result : -EFAULT;
968 }
969 spin_lock_irqsave(&runtime->lock, flags);
970 }
971 result += count1;
972 count -= count1;
973 }
974 spin_unlock_irqrestore(&runtime->lock, flags);
975 return result;
976}
977
978long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
979 unsigned char *buf, long count)
980{
981 snd_rawmidi_input_trigger(substream, 1);
982 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
983}
984EXPORT_SYMBOL(snd_rawmidi_kernel_read);
985
986static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
987 loff_t *offset)
988{
989 long result;
990 int count1;
991 struct snd_rawmidi_file *rfile;
992 struct snd_rawmidi_substream *substream;
993 struct snd_rawmidi_runtime *runtime;
994
995 rfile = file->private_data;
996 substream = rfile->input;
997 if (substream == NULL)
998 return -EIO;
999 runtime = substream->runtime;
1000 snd_rawmidi_input_trigger(substream, 1);
1001 result = 0;
1002 while (count > 0) {
1003 spin_lock_irq(&runtime->lock);
1004 while (!snd_rawmidi_ready(substream)) {
1005 wait_queue_t wait;
1006 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1007 spin_unlock_irq(&runtime->lock);
1008 return result > 0 ? result : -EAGAIN;
1009 }
1010 init_waitqueue_entry(&wait, current);
1011 add_wait_queue(&runtime->sleep, &wait);
1012 set_current_state(TASK_INTERRUPTIBLE);
1013 spin_unlock_irq(&runtime->lock);
1014 schedule();
1015 remove_wait_queue(&runtime->sleep, &wait);
1016 if (rfile->rmidi->card->shutdown)
1017 return -ENODEV;
1018 if (signal_pending(current))
1019 return result > 0 ? result : -ERESTARTSYS;
1020 if (!runtime->avail)
1021 return result > 0 ? result : -EIO;
1022 spin_lock_irq(&runtime->lock);
1023 }
1024 spin_unlock_irq(&runtime->lock);
1025 count1 = snd_rawmidi_kernel_read1(substream,
1026 (unsigned char __user *)buf,
1027 NULL/*kernelbuf*/,
1028 count);
1029 if (count1 < 0)
1030 return result > 0 ? result : count1;
1031 result += count1;
1032 buf += count1;
1033 count -= count1;
1034 }
1035 return result;
1036}
1037
1038/**
1039 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1040 * @substream: the rawmidi substream
1041 *
1042 * Return: 1 if the internal output buffer is empty, 0 if not.
1043 */
1044int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1045{
1046 struct snd_rawmidi_runtime *runtime = substream->runtime;
1047 int result;
1048 unsigned long flags;
1049
1050 if (runtime->buffer == NULL) {
1051 rmidi_dbg(substream->rmidi,
1052 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1053 return 1;
1054 }
1055 spin_lock_irqsave(&runtime->lock, flags);
1056 result = runtime->avail >= runtime->buffer_size;
1057 spin_unlock_irqrestore(&runtime->lock, flags);
1058 return result;
1059}
1060EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1061
1062/**
1063 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1064 * @substream: the rawmidi substream
1065 * @buffer: the buffer pointer
1066 * @count: data size to transfer
1067 *
1068 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1069 */
1070int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071 unsigned char *buffer, int count)
1072{
1073 int result, count1;
1074 struct snd_rawmidi_runtime *runtime = substream->runtime;
1075
1076 if (runtime->buffer == NULL) {
1077 rmidi_dbg(substream->rmidi,
1078 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1079 return -EINVAL;
1080 }
1081 result = 0;
1082 if (runtime->avail >= runtime->buffer_size) {
1083 /* warning: lowlevel layer MUST trigger down the hardware */
1084 goto __skip;
1085 }
1086 if (count == 1) { /* special case, faster code */
1087 *buffer = runtime->buffer[runtime->hw_ptr];
1088 result++;
1089 } else {
1090 count1 = runtime->buffer_size - runtime->hw_ptr;
1091 if (count1 > count)
1092 count1 = count;
1093 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1094 count1 = runtime->buffer_size - runtime->avail;
1095 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1096 count -= count1;
1097 result += count1;
1098 if (count > 0) {
1099 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1100 count = runtime->buffer_size - runtime->avail - count1;
1101 memcpy(buffer + count1, runtime->buffer, count);
1102 result += count;
1103 }
1104 }
1105 __skip:
1106 return result;
1107}
1108EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1109
1110/**
1111 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1112 * @substream: the rawmidi substream
1113 * @buffer: the buffer pointer
1114 * @count: data size to transfer
1115 *
1116 * Copies data from the internal output buffer to the given buffer.
1117 *
1118 * Call this in the interrupt handler when the midi output is ready,
1119 * and call snd_rawmidi_transmit_ack() after the transmission is
1120 * finished.
1121 *
1122 * Return: The size of copied data, or a negative error code on failure.
1123 */
1124int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1125 unsigned char *buffer, int count)
1126{
1127 struct snd_rawmidi_runtime *runtime = substream->runtime;
1128 int result;
1129 unsigned long flags;
1130
1131 spin_lock_irqsave(&runtime->lock, flags);
1132 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1133 spin_unlock_irqrestore(&runtime->lock, flags);
1134 return result;
1135}
1136EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1137
1138/**
1139 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1140 * @substream: the rawmidi substream
1141 * @count: the transferred count
1142 *
1143 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1144 */
1145int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1146{
1147 struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149 if (runtime->buffer == NULL) {
1150 rmidi_dbg(substream->rmidi,
1151 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1152 return -EINVAL;
1153 }
1154 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1155 runtime->hw_ptr += count;
1156 runtime->hw_ptr %= runtime->buffer_size;
1157 runtime->avail += count;
1158 substream->bytes += count;
1159 if (count > 0) {
1160 if (runtime->drain || snd_rawmidi_ready(substream))
1161 wake_up(&runtime->sleep);
1162 }
1163 return count;
1164}
1165EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1166
1167/**
1168 * snd_rawmidi_transmit_ack - acknowledge the transmission
1169 * @substream: the rawmidi substream
1170 * @count: the transferred count
1171 *
1172 * Advances the hardware pointer for the internal output buffer with
1173 * the given size and updates the condition.
1174 * Call after the transmission is finished.
1175 *
1176 * Return: The advanced size if successful, or a negative error code on failure.
1177 */
1178int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1179{
1180 struct snd_rawmidi_runtime *runtime = substream->runtime;
1181 int result;
1182 unsigned long flags;
1183
1184 spin_lock_irqsave(&runtime->lock, flags);
1185 result = __snd_rawmidi_transmit_ack(substream, count);
1186 spin_unlock_irqrestore(&runtime->lock, flags);
1187 return result;
1188}
1189EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1190
1191/**
1192 * snd_rawmidi_transmit - copy from the buffer to the device
1193 * @substream: the rawmidi substream
1194 * @buffer: the buffer pointer
1195 * @count: the data size to transfer
1196 *
1197 * Copies data from the buffer to the device and advances the pointer.
1198 *
1199 * Return: The copied size if successful, or a negative error code on failure.
1200 */
1201int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1202 unsigned char *buffer, int count)
1203{
1204 struct snd_rawmidi_runtime *runtime = substream->runtime;
1205 int result;
1206 unsigned long flags;
1207
1208 spin_lock_irqsave(&runtime->lock, flags);
1209 if (!substream->opened)
1210 result = -EBADFD;
1211 else {
1212 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1213 if (count <= 0)
1214 result = count;
1215 else
1216 result = __snd_rawmidi_transmit_ack(substream, count);
1217 }
1218 spin_unlock_irqrestore(&runtime->lock, flags);
1219 return result;
1220}
1221EXPORT_SYMBOL(snd_rawmidi_transmit);
1222
1223static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1224 const unsigned char __user *userbuf,
1225 const unsigned char *kernelbuf,
1226 long count)
1227{
1228 unsigned long flags;
1229 long count1, result;
1230 struct snd_rawmidi_runtime *runtime = substream->runtime;
1231 unsigned long appl_ptr;
1232
1233 if (!kernelbuf && !userbuf)
1234 return -EINVAL;
1235 if (snd_BUG_ON(!runtime->buffer))
1236 return -EINVAL;
1237
1238 result = 0;
1239 spin_lock_irqsave(&runtime->lock, flags);
1240 if (substream->append) {
1241 if ((long)runtime->avail < count) {
1242 spin_unlock_irqrestore(&runtime->lock, flags);
1243 return -EAGAIN;
1244 }
1245 }
1246 while (count > 0 && runtime->avail > 0) {
1247 count1 = runtime->buffer_size - runtime->appl_ptr;
1248 if (count1 > count)
1249 count1 = count;
1250 if (count1 > (long)runtime->avail)
1251 count1 = runtime->avail;
1252
1253 /* update runtime->appl_ptr before unlocking for userbuf */
1254 appl_ptr = runtime->appl_ptr;
1255 runtime->appl_ptr += count1;
1256 runtime->appl_ptr %= runtime->buffer_size;
1257 runtime->avail -= count1;
1258
1259 if (kernelbuf)
1260 memcpy(runtime->buffer + appl_ptr,
1261 kernelbuf + result, count1);
1262 else if (userbuf) {
1263 spin_unlock_irqrestore(&runtime->lock, flags);
1264 if (copy_from_user(runtime->buffer + appl_ptr,
1265 userbuf + result, count1)) {
1266 spin_lock_irqsave(&runtime->lock, flags);
1267 result = result > 0 ? result : -EFAULT;
1268 goto __end;
1269 }
1270 spin_lock_irqsave(&runtime->lock, flags);
1271 }
1272 result += count1;
1273 count -= count1;
1274 }
1275 __end:
1276 count1 = runtime->avail < runtime->buffer_size;
1277 spin_unlock_irqrestore(&runtime->lock, flags);
1278 if (count1)
1279 snd_rawmidi_output_trigger(substream, 1);
1280 return result;
1281}
1282
1283long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1284 const unsigned char *buf, long count)
1285{
1286 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1287}
1288EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1289
1290static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1291 size_t count, loff_t *offset)
1292{
1293 long result, timeout;
1294 int count1;
1295 struct snd_rawmidi_file *rfile;
1296 struct snd_rawmidi_runtime *runtime;
1297 struct snd_rawmidi_substream *substream;
1298
1299 rfile = file->private_data;
1300 substream = rfile->output;
1301 runtime = substream->runtime;
1302 /* we cannot put an atomic message to our buffer */
1303 if (substream->append && count > runtime->buffer_size)
1304 return -EIO;
1305 result = 0;
1306 while (count > 0) {
1307 spin_lock_irq(&runtime->lock);
1308 while (!snd_rawmidi_ready_append(substream, count)) {
1309 wait_queue_t wait;
1310 if (file->f_flags & O_NONBLOCK) {
1311 spin_unlock_irq(&runtime->lock);
1312 return result > 0 ? result : -EAGAIN;
1313 }
1314 init_waitqueue_entry(&wait, current);
1315 add_wait_queue(&runtime->sleep, &wait);
1316 set_current_state(TASK_INTERRUPTIBLE);
1317 spin_unlock_irq(&runtime->lock);
1318 timeout = schedule_timeout(30 * HZ);
1319 remove_wait_queue(&runtime->sleep, &wait);
1320 if (rfile->rmidi->card->shutdown)
1321 return -ENODEV;
1322 if (signal_pending(current))
1323 return result > 0 ? result : -ERESTARTSYS;
1324 if (!runtime->avail && !timeout)
1325 return result > 0 ? result : -EIO;
1326 spin_lock_irq(&runtime->lock);
1327 }
1328 spin_unlock_irq(&runtime->lock);
1329 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1330 if (count1 < 0)
1331 return result > 0 ? result : count1;
1332 result += count1;
1333 buf += count1;
1334 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1335 break;
1336 count -= count1;
1337 }
1338 if (file->f_flags & O_DSYNC) {
1339 spin_lock_irq(&runtime->lock);
1340 while (runtime->avail != runtime->buffer_size) {
1341 wait_queue_t wait;
1342 unsigned int last_avail = runtime->avail;
1343 init_waitqueue_entry(&wait, current);
1344 add_wait_queue(&runtime->sleep, &wait);
1345 set_current_state(TASK_INTERRUPTIBLE);
1346 spin_unlock_irq(&runtime->lock);
1347 timeout = schedule_timeout(30 * HZ);
1348 remove_wait_queue(&runtime->sleep, &wait);
1349 if (signal_pending(current))
1350 return result > 0 ? result : -ERESTARTSYS;
1351 if (runtime->avail == last_avail && !timeout)
1352 return result > 0 ? result : -EIO;
1353 spin_lock_irq(&runtime->lock);
1354 }
1355 spin_unlock_irq(&runtime->lock);
1356 }
1357 return result;
1358}
1359
1360static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1361{
1362 struct snd_rawmidi_file *rfile;
1363 struct snd_rawmidi_runtime *runtime;
1364 unsigned int mask;
1365
1366 rfile = file->private_data;
1367 if (rfile->input != NULL) {
1368 runtime = rfile->input->runtime;
1369 snd_rawmidi_input_trigger(rfile->input, 1);
1370 poll_wait(file, &runtime->sleep, wait);
1371 }
1372 if (rfile->output != NULL) {
1373 runtime = rfile->output->runtime;
1374 poll_wait(file, &runtime->sleep, wait);
1375 }
1376 mask = 0;
1377 if (rfile->input != NULL) {
1378 if (snd_rawmidi_ready(rfile->input))
1379 mask |= POLLIN | POLLRDNORM;
1380 }
1381 if (rfile->output != NULL) {
1382 if (snd_rawmidi_ready(rfile->output))
1383 mask |= POLLOUT | POLLWRNORM;
1384 }
1385 return mask;
1386}
1387
1388/*
1389 */
1390#ifdef CONFIG_COMPAT
1391#include "rawmidi_compat.c"
1392#else
1393#define snd_rawmidi_ioctl_compat NULL
1394#endif
1395
1396/*
1397
1398 */
1399
1400static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1401 struct snd_info_buffer *buffer)
1402{
1403 struct snd_rawmidi *rmidi;
1404 struct snd_rawmidi_substream *substream;
1405 struct snd_rawmidi_runtime *runtime;
1406
1407 rmidi = entry->private_data;
1408 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1409 mutex_lock(&rmidi->open_mutex);
1410 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1411 list_for_each_entry(substream,
1412 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1413 list) {
1414 snd_iprintf(buffer,
1415 "Output %d\n"
1416 " Tx bytes : %lu\n",
1417 substream->number,
1418 (unsigned long) substream->bytes);
1419 if (substream->opened) {
1420 snd_iprintf(buffer,
1421 " Owner PID : %d\n",
1422 pid_vnr(substream->pid));
1423 runtime = substream->runtime;
1424 snd_iprintf(buffer,
1425 " Mode : %s\n"
1426 " Buffer size : %lu\n"
1427 " Avail : %lu\n",
1428 runtime->oss ? "OSS compatible" : "native",
1429 (unsigned long) runtime->buffer_size,
1430 (unsigned long) runtime->avail);
1431 }
1432 }
1433 }
1434 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1435 list_for_each_entry(substream,
1436 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1437 list) {
1438 snd_iprintf(buffer,
1439 "Input %d\n"
1440 " Rx bytes : %lu\n",
1441 substream->number,
1442 (unsigned long) substream->bytes);
1443 if (substream->opened) {
1444 snd_iprintf(buffer,
1445 " Owner PID : %d\n",
1446 pid_vnr(substream->pid));
1447 runtime = substream->runtime;
1448 snd_iprintf(buffer,
1449 " Buffer size : %lu\n"
1450 " Avail : %lu\n"
1451 " Overruns : %lu\n",
1452 (unsigned long) runtime->buffer_size,
1453 (unsigned long) runtime->avail,
1454 (unsigned long) runtime->xruns);
1455 }
1456 }
1457 }
1458 mutex_unlock(&rmidi->open_mutex);
1459}
1460
1461/*
1462 * Register functions
1463 */
1464
1465static const struct file_operations snd_rawmidi_f_ops =
1466{
1467 .owner = THIS_MODULE,
1468 .read = snd_rawmidi_read,
1469 .write = snd_rawmidi_write,
1470 .open = snd_rawmidi_open,
1471 .release = snd_rawmidi_release,
1472 .llseek = no_llseek,
1473 .poll = snd_rawmidi_poll,
1474 .unlocked_ioctl = snd_rawmidi_ioctl,
1475 .compat_ioctl = snd_rawmidi_ioctl_compat,
1476};
1477
1478static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1479 struct snd_rawmidi_str *stream,
1480 int direction,
1481 int count)
1482{
1483 struct snd_rawmidi_substream *substream;
1484 int idx;
1485
1486 for (idx = 0; idx < count; idx++) {
1487 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1488 if (!substream)
1489 return -ENOMEM;
1490 substream->stream = direction;
1491 substream->number = idx;
1492 substream->rmidi = rmidi;
1493 substream->pstr = stream;
1494 list_add_tail(&substream->list, &stream->substreams);
1495 stream->substream_count++;
1496 }
1497 return 0;
1498}
1499
1500static void release_rawmidi_device(struct device *dev)
1501{
1502 kfree(container_of(dev, struct snd_rawmidi, dev));
1503}
1504
1505/**
1506 * snd_rawmidi_new - create a rawmidi instance
1507 * @card: the card instance
1508 * @id: the id string
1509 * @device: the device index
1510 * @output_count: the number of output streams
1511 * @input_count: the number of input streams
1512 * @rrawmidi: the pointer to store the new rawmidi instance
1513 *
1514 * Creates a new rawmidi instance.
1515 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1516 *
1517 * Return: Zero if successful, or a negative error code on failure.
1518 */
1519int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1520 int output_count, int input_count,
1521 struct snd_rawmidi ** rrawmidi)
1522{
1523 struct snd_rawmidi *rmidi;
1524 int err;
1525 static struct snd_device_ops ops = {
1526 .dev_free = snd_rawmidi_dev_free,
1527 .dev_register = snd_rawmidi_dev_register,
1528 .dev_disconnect = snd_rawmidi_dev_disconnect,
1529 };
1530
1531 if (snd_BUG_ON(!card))
1532 return -ENXIO;
1533 if (rrawmidi)
1534 *rrawmidi = NULL;
1535 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1536 if (!rmidi)
1537 return -ENOMEM;
1538 rmidi->card = card;
1539 rmidi->device = device;
1540 mutex_init(&rmidi->open_mutex);
1541 init_waitqueue_head(&rmidi->open_wait);
1542 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1543 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1544
1545 if (id != NULL)
1546 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1547
1548 snd_device_initialize(&rmidi->dev, card);
1549 rmidi->dev.release = release_rawmidi_device;
1550 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1551
1552 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1553 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1554 SNDRV_RAWMIDI_STREAM_INPUT,
1555 input_count)) < 0) {
1556 snd_rawmidi_free(rmidi);
1557 return err;
1558 }
1559 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1560 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1561 SNDRV_RAWMIDI_STREAM_OUTPUT,
1562 output_count)) < 0) {
1563 snd_rawmidi_free(rmidi);
1564 return err;
1565 }
1566 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1567 snd_rawmidi_free(rmidi);
1568 return err;
1569 }
1570 if (rrawmidi)
1571 *rrawmidi = rmidi;
1572 return 0;
1573}
1574EXPORT_SYMBOL(snd_rawmidi_new);
1575
1576static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1577{
1578 struct snd_rawmidi_substream *substream;
1579
1580 while (!list_empty(&stream->substreams)) {
1581 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1582 list_del(&substream->list);
1583 kfree(substream);
1584 }
1585}
1586
1587static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1588{
1589 if (!rmidi)
1590 return 0;
1591
1592 snd_info_free_entry(rmidi->proc_entry);
1593 rmidi->proc_entry = NULL;
1594 mutex_lock(®ister_mutex);
1595 if (rmidi->ops && rmidi->ops->dev_unregister)
1596 rmidi->ops->dev_unregister(rmidi);
1597 mutex_unlock(®ister_mutex);
1598
1599 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1600 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1601 if (rmidi->private_free)
1602 rmidi->private_free(rmidi);
1603 put_device(&rmidi->dev);
1604 return 0;
1605}
1606
1607static int snd_rawmidi_dev_free(struct snd_device *device)
1608{
1609 struct snd_rawmidi *rmidi = device->device_data;
1610 return snd_rawmidi_free(rmidi);
1611}
1612
1613#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1614static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1615{
1616 struct snd_rawmidi *rmidi = device->private_data;
1617 rmidi->seq_dev = NULL;
1618}
1619#endif
1620
1621static int snd_rawmidi_dev_register(struct snd_device *device)
1622{
1623 int err;
1624 struct snd_info_entry *entry;
1625 char name[16];
1626 struct snd_rawmidi *rmidi = device->device_data;
1627
1628 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1629 return -ENOMEM;
1630 mutex_lock(®ister_mutex);
1631 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1632 mutex_unlock(®ister_mutex);
1633 return -EBUSY;
1634 }
1635 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1636 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1637 rmidi->card, rmidi->device,
1638 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1639 if (err < 0) {
1640 rmidi_err(rmidi, "unable to register\n");
1641 list_del(&rmidi->list);
1642 mutex_unlock(®ister_mutex);
1643 return err;
1644 }
1645 if (rmidi->ops && rmidi->ops->dev_register &&
1646 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1647 snd_unregister_device(&rmidi->dev);
1648 list_del(&rmidi->list);
1649 mutex_unlock(®ister_mutex);
1650 return err;
1651 }
1652#ifdef CONFIG_SND_OSSEMUL
1653 rmidi->ossreg = 0;
1654 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1655 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1656 rmidi->card, 0, &snd_rawmidi_f_ops,
1657 rmidi) < 0) {
1658 rmidi_err(rmidi,
1659 "unable to register OSS rawmidi device %i:%i\n",
1660 rmidi->card->number, 0);
1661 } else {
1662 rmidi->ossreg++;
1663#ifdef SNDRV_OSS_INFO_DEV_MIDI
1664 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1665#endif
1666 }
1667 }
1668 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1669 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1670 rmidi->card, 1, &snd_rawmidi_f_ops,
1671 rmidi) < 0) {
1672 rmidi_err(rmidi,
1673 "unable to register OSS rawmidi device %i:%i\n",
1674 rmidi->card->number, 1);
1675 } else {
1676 rmidi->ossreg++;
1677 }
1678 }
1679#endif /* CONFIG_SND_OSSEMUL */
1680 mutex_unlock(®ister_mutex);
1681 sprintf(name, "midi%d", rmidi->device);
1682 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1683 if (entry) {
1684 entry->private_data = rmidi;
1685 entry->c.text.read = snd_rawmidi_proc_info_read;
1686 if (snd_info_register(entry) < 0) {
1687 snd_info_free_entry(entry);
1688 entry = NULL;
1689 }
1690 }
1691 rmidi->proc_entry = entry;
1692#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1693 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1694 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1695 rmidi->seq_dev->private_data = rmidi;
1696 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1697 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1698 snd_device_register(rmidi->card, rmidi->seq_dev);
1699 }
1700 }
1701#endif
1702 return 0;
1703}
1704
1705static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1706{
1707 struct snd_rawmidi *rmidi = device->device_data;
1708 int dir;
1709
1710 mutex_lock(®ister_mutex);
1711 mutex_lock(&rmidi->open_mutex);
1712 wake_up(&rmidi->open_wait);
1713 list_del_init(&rmidi->list);
1714 for (dir = 0; dir < 2; dir++) {
1715 struct snd_rawmidi_substream *s;
1716 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1717 if (s->runtime)
1718 wake_up(&s->runtime->sleep);
1719 }
1720 }
1721
1722#ifdef CONFIG_SND_OSSEMUL
1723 if (rmidi->ossreg) {
1724 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1725 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1726#ifdef SNDRV_OSS_INFO_DEV_MIDI
1727 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1728#endif
1729 }
1730 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1731 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1732 rmidi->ossreg = 0;
1733 }
1734#endif /* CONFIG_SND_OSSEMUL */
1735 snd_unregister_device(&rmidi->dev);
1736 mutex_unlock(&rmidi->open_mutex);
1737 mutex_unlock(®ister_mutex);
1738 return 0;
1739}
1740
1741/**
1742 * snd_rawmidi_set_ops - set the rawmidi operators
1743 * @rmidi: the rawmidi instance
1744 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1745 * @ops: the operator table
1746 *
1747 * Sets the rawmidi operators for the given stream direction.
1748 */
1749void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1750 struct snd_rawmidi_ops *ops)
1751{
1752 struct snd_rawmidi_substream *substream;
1753
1754 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1755 substream->ops = ops;
1756}
1757EXPORT_SYMBOL(snd_rawmidi_set_ops);
1758
1759/*
1760 * ENTRY functions
1761 */
1762
1763static int __init alsa_rawmidi_init(void)
1764{
1765
1766 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1767 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1768#ifdef CONFIG_SND_OSSEMUL
1769 { int i;
1770 /* check device map table */
1771 for (i = 0; i < SNDRV_CARDS; i++) {
1772 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1773 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1774 i, midi_map[i]);
1775 midi_map[i] = 0;
1776 }
1777 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1778 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1779 i, amidi_map[i]);
1780 amidi_map[i] = 1;
1781 }
1782 }
1783 }
1784#endif /* CONFIG_SND_OSSEMUL */
1785 return 0;
1786}
1787
1788static void __exit alsa_rawmidi_exit(void)
1789{
1790 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1791 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1792}
1793
1794module_init(alsa_rawmidi_init)
1795module_exit(alsa_rawmidi_exit)