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