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KEYS: add missing permission check for request_key() destination
[linux/fpc-iii.git] / sound / core / rawmidi.c
blobb5c88e08f3feadcc85f122f889167e0b06ac372d
1 /*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/core.h>
23 #include <linux/major.h>
24 #include <linux/init.h>
25 #include <linux/sched.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/mutex.h>
30 #include <linux/module.h>
31 #include <linux/delay.h>
32 #include <sound/rawmidi.h>
33 #include <sound/info.h>
34 #include <sound/control.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40 MODULE_LICENSE("GPL");
41
42 #ifdef CONFIG_SND_OSSEMUL
43 static int midi_map[SNDRV_CARDS];
44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45 module_param_array(midi_map, int, NULL, 0444);
46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47 module_param_array(amidi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49 #endif /* CONFIG_SND_OSSEMUL */
50
51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52 static int snd_rawmidi_dev_free(struct snd_device *device);
53 static int snd_rawmidi_dev_register(struct snd_device *device);
54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56 static LIST_HEAD(snd_rawmidi_devices);
57 static DEFINE_MUTEX(register_mutex);
58
59 #define rmidi_err(rmidi, fmt, args...) \
60 dev_err((rmidi)->card->dev, fmt, ##args)
61 #define rmidi_warn(rmidi, fmt, args...) \
62 dev_warn((rmidi)->card->dev, fmt, ##args)
63 #define rmidi_dbg(rmidi, fmt, args...) \
64 dev_dbg((rmidi)->card->dev, fmt, ##args)
65
66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
67 {
68 struct snd_rawmidi *rawmidi;
69
70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
71 if (rawmidi->card == card && rawmidi->device == device)
72 return rawmidi;
73 return NULL;
74 }
75
76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
77 {
78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
79 case FMODE_WRITE:
80 return SNDRV_RAWMIDI_LFLG_OUTPUT;
81 case FMODE_READ:
82 return SNDRV_RAWMIDI_LFLG_INPUT;
83 default:
84 return SNDRV_RAWMIDI_LFLG_OPEN;
85 }
86 }
87
88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
89 {
90 struct snd_rawmidi_runtime *runtime = substream->runtime;
91 return runtime->avail >= runtime->avail_min;
92 }
93
94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
95 size_t count)
96 {
97 struct snd_rawmidi_runtime *runtime = substream->runtime;
98 return runtime->avail >= runtime->avail_min &&
99 (!substream->append || runtime->avail >= count);
100 }
101
102 static void snd_rawmidi_input_event_work(struct work_struct *work)
103 {
104 struct snd_rawmidi_runtime *runtime =
105 container_of(work, struct snd_rawmidi_runtime, event_work);
106 if (runtime->event)
107 runtime->event(runtime->substream);
108 }
109
110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
111 {
112 struct snd_rawmidi_runtime *runtime;
113
114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
115 return -ENOMEM;
116 runtime->substream = substream;
117 spin_lock_init(&runtime->lock);
118 init_waitqueue_head(&runtime->sleep);
119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
120 runtime->event = NULL;
121 runtime->buffer_size = PAGE_SIZE;
122 runtime->avail_min = 1;
123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
124 runtime->avail = 0;
125 else
126 runtime->avail = runtime->buffer_size;
127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
128 kfree(runtime);
129 return -ENOMEM;
130 }
131 runtime->appl_ptr = runtime->hw_ptr = 0;
132 substream->runtime = runtime;
133 return 0;
134 }
135
136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
137 {
138 struct snd_rawmidi_runtime *runtime = substream->runtime;
139
140 kfree(runtime->buffer);
141 kfree(runtime);
142 substream->runtime = NULL;
143 return 0;
144 }
145
146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
147 {
148 if (!substream->opened)
149 return;
150 substream->ops->trigger(substream, up);
151 }
152
153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155 if (!substream->opened)
156 return;
157 substream->ops->trigger(substream, up);
158 if (!up)
159 cancel_work_sync(&substream->runtime->event_work);
160 }
161
162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
163 {
164 unsigned long flags;
165 struct snd_rawmidi_runtime *runtime = substream->runtime;
166
167 snd_rawmidi_output_trigger(substream, 0);
168 runtime->drain = 0;
169 spin_lock_irqsave(&runtime->lock, flags);
170 runtime->appl_ptr = runtime->hw_ptr = 0;
171 runtime->avail = runtime->buffer_size;
172 spin_unlock_irqrestore(&runtime->lock, flags);
173 return 0;
174 }
175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
178 {
179 int err;
180 long timeout;
181 struct snd_rawmidi_runtime *runtime = substream->runtime;
182
183 err = 0;
184 runtime->drain = 1;
185 timeout = wait_event_interruptible_timeout(runtime->sleep,
186 (runtime->avail >= runtime->buffer_size),
187 10*HZ);
188 if (signal_pending(current))
189 err = -ERESTARTSYS;
190 if (runtime->avail < runtime->buffer_size && !timeout) {
191 rmidi_warn(substream->rmidi,
192 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
193 (long)runtime->avail, (long)runtime->buffer_size);
194 err = -EIO;
195 }
196 runtime->drain = 0;
197 if (err != -ERESTARTSYS) {
198 /* we need wait a while to make sure that Tx FIFOs are empty */
199 if (substream->ops->drain)
200 substream->ops->drain(substream);
201 else
202 msleep(50);
203 snd_rawmidi_drop_output(substream);
204 }
205 return err;
206 }
207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210 {
211 unsigned long flags;
212 struct snd_rawmidi_runtime *runtime = substream->runtime;
213
214 snd_rawmidi_input_trigger(substream, 0);
215 runtime->drain = 0;
216 spin_lock_irqsave(&runtime->lock, flags);
217 runtime->appl_ptr = runtime->hw_ptr = 0;
218 runtime->avail = 0;
219 spin_unlock_irqrestore(&runtime->lock, flags);
220 return 0;
221 }
222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
223
224 /* look for an available substream for the given stream direction;
225 * if a specific subdevice is given, try to assign it
226 */
227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
228 int stream, int mode,
229 struct snd_rawmidi_substream **sub_ret)
230 {
231 struct snd_rawmidi_substream *substream;
232 struct snd_rawmidi_str *s = &rmidi->streams[stream];
233 static unsigned int info_flags[2] = {
234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
236 };
237
238 if (!(rmidi->info_flags & info_flags[stream]))
239 return -ENXIO;
240 if (subdevice >= 0 && subdevice >= s->substream_count)
241 return -ENODEV;
242
243 list_for_each_entry(substream, &s->substreams, list) {
244 if (substream->opened) {
245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
247 !substream->append)
248 continue;
249 }
250 if (subdevice < 0 || subdevice == substream->number) {
251 *sub_ret = substream;
252 return 0;
253 }
254 }
255 return -EAGAIN;
256 }
257
258 /* open and do ref-counting for the given substream */
259 static int open_substream(struct snd_rawmidi *rmidi,
260 struct snd_rawmidi_substream *substream,
261 int mode)
262 {
263 int err;
264
265 if (substream->use_count == 0) {
266 err = snd_rawmidi_runtime_create(substream);
267 if (err < 0)
268 return err;
269 err = substream->ops->open(substream);
270 if (err < 0) {
271 snd_rawmidi_runtime_free(substream);
272 return err;
273 }
274 substream->opened = 1;
275 substream->active_sensing = 0;
276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
277 substream->append = 1;
278 substream->pid = get_pid(task_pid(current));
279 rmidi->streams[substream->stream].substream_opened++;
280 }
281 substream->use_count++;
282 return 0;
283 }
284
285 static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
290 struct snd_rawmidi_file *rfile)
291 {
292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
293 int err;
294
295 rfile->input = rfile->output = NULL;
296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
297 err = assign_substream(rmidi, subdevice,
298 SNDRV_RAWMIDI_STREAM_INPUT,
299 mode, &sinput);
300 if (err < 0)
301 return err;
302 }
303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
304 err = assign_substream(rmidi, subdevice,
305 SNDRV_RAWMIDI_STREAM_OUTPUT,
306 mode, &soutput);
307 if (err < 0)
308 return err;
309 }
310
311 if (sinput) {
312 err = open_substream(rmidi, sinput, mode);
313 if (err < 0)
314 return err;
315 }
316 if (soutput) {
317 err = open_substream(rmidi, soutput, mode);
318 if (err < 0) {
319 if (sinput)
320 close_substream(rmidi, sinput, 0);
321 return err;
322 }
323 }
324
325 rfile->rmidi = rmidi;
326 rfile->input = sinput;
327 rfile->output = soutput;
328 return 0;
329 }
330
331 /* called from sound/core/seq/seq_midi.c */
332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
333 int mode, struct snd_rawmidi_file * rfile)
334 {
335 struct snd_rawmidi *rmidi;
336 int err;
337
338 if (snd_BUG_ON(!rfile))
339 return -EINVAL;
340
341 mutex_lock(&register_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(&register_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(&register_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(&register_mutex);
352
353 mutex_lock(&rmidi->open_mutex);
354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
355 mutex_unlock(&rmidi->open_mutex);
356 if (err < 0)
357 module_put(rmidi->card->module);
358 return err;
359 }
360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
363 {
364 int maj = imajor(inode);
365 struct snd_card *card;
366 int subdevice;
367 unsigned short fflags;
368 int err;
369 struct snd_rawmidi *rmidi;
370 struct snd_rawmidi_file *rawmidi_file = NULL;
371 wait_queue_t wait;
372 struct snd_ctl_file *kctl;
373
374 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
375 return -EINVAL; /* invalid combination */
376
377 err = nonseekable_open(inode, file);
378 if (err < 0)
379 return err;
380
381 if (maj == snd_major) {
382 rmidi = snd_lookup_minor_data(iminor(inode),
383 SNDRV_DEVICE_TYPE_RAWMIDI);
384 #ifdef CONFIG_SND_OSSEMUL
385 } else if (maj == SOUND_MAJOR) {
386 rmidi = snd_lookup_oss_minor_data(iminor(inode),
387 SNDRV_OSS_DEVICE_TYPE_MIDI);
388 #endif
389 } else
390 return -ENXIO;
391
392 if (rmidi == NULL)
393 return -ENODEV;
394
395 if (!try_module_get(rmidi->card->module)) {
396 snd_card_unref(rmidi->card);
397 return -ENXIO;
398 }
399
400 mutex_lock(&rmidi->open_mutex);
401 card = rmidi->card;
402 err = snd_card_file_add(card, file);
403 if (err < 0)
404 goto __error_card;
405 fflags = snd_rawmidi_file_flags(file);
406 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
407 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
408 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
409 if (rawmidi_file == NULL) {
410 err = -ENOMEM;
411 goto __error;
412 }
413 init_waitqueue_entry(&wait, current);
414 add_wait_queue(&rmidi->open_wait, &wait);
415 while (1) {
416 subdevice = -1;
417 read_lock(&card->ctl_files_rwlock);
418 list_for_each_entry(kctl, &card->ctl_files, list) {
419 if (kctl->pid == task_pid(current)) {
420 subdevice = kctl->prefer_rawmidi_subdevice;
421 if (subdevice != -1)
422 break;
423 }
424 }
425 read_unlock(&card->ctl_files_rwlock);
426 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
427 if (err >= 0)
428 break;
429 if (err == -EAGAIN) {
430 if (file->f_flags & O_NONBLOCK) {
431 err = -EBUSY;
432 break;
433 }
434 } else
435 break;
436 set_current_state(TASK_INTERRUPTIBLE);
437 mutex_unlock(&rmidi->open_mutex);
438 schedule();
439 mutex_lock(&rmidi->open_mutex);
440 if (rmidi->card->shutdown) {
441 err = -ENODEV;
442 break;
443 }
444 if (signal_pending(current)) {
445 err = -ERESTARTSYS;
446 break;
447 }
448 }
449 remove_wait_queue(&rmidi->open_wait, &wait);
450 if (err < 0) {
451 kfree(rawmidi_file);
452 goto __error;
453 }
454 #ifdef CONFIG_SND_OSSEMUL
455 if (rawmidi_file->input && rawmidi_file->input->runtime)
456 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
457 if (rawmidi_file->output && rawmidi_file->output->runtime)
458 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
459 #endif
460 file->private_data = rawmidi_file;
461 mutex_unlock(&rmidi->open_mutex);
462 snd_card_unref(rmidi->card);
463 return 0;
464
465 __error:
466 snd_card_file_remove(card, file);
467 __error_card:
468 mutex_unlock(&rmidi->open_mutex);
469 module_put(rmidi->card->module);
470 snd_card_unref(rmidi->card);
471 return err;
472 }
473
474 static void close_substream(struct snd_rawmidi *rmidi,
475 struct snd_rawmidi_substream *substream,
476 int cleanup)
477 {
478 if (--substream->use_count)
479 return;
480
481 if (cleanup) {
482 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
483 snd_rawmidi_input_trigger(substream, 0);
484 else {
485 if (substream->active_sensing) {
486 unsigned char buf = 0xfe;
487 /* sending single active sensing message
488 * to shut the device up
489 */
490 snd_rawmidi_kernel_write(substream, &buf, 1);
491 }
492 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
493 snd_rawmidi_output_trigger(substream, 0);
494 }
495 }
496 substream->ops->close(substream);
497 if (substream->runtime->private_free)
498 substream->runtime->private_free(substream);
499 snd_rawmidi_runtime_free(substream);
500 substream->opened = 0;
501 substream->append = 0;
502 put_pid(substream->pid);
503 substream->pid = NULL;
504 rmidi->streams[substream->stream].substream_opened--;
505 }
506
507 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
508 {
509 struct snd_rawmidi *rmidi;
510
511 rmidi = rfile->rmidi;
512 mutex_lock(&rmidi->open_mutex);
513 if (rfile->input) {
514 close_substream(rmidi, rfile->input, 1);
515 rfile->input = NULL;
516 }
517 if (rfile->output) {
518 close_substream(rmidi, rfile->output, 1);
519 rfile->output = NULL;
520 }
521 rfile->rmidi = NULL;
522 mutex_unlock(&rmidi->open_mutex);
523 wake_up(&rmidi->open_wait);
524 }
525
526 /* called from sound/core/seq/seq_midi.c */
527 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
528 {
529 struct snd_rawmidi *rmidi;
530
531 if (snd_BUG_ON(!rfile))
532 return -ENXIO;
533
534 rmidi = rfile->rmidi;
535 rawmidi_release_priv(rfile);
536 module_put(rmidi->card->module);
537 return 0;
538 }
539 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
540
541 static int snd_rawmidi_release(struct inode *inode, struct file *file)
542 {
543 struct snd_rawmidi_file *rfile;
544 struct snd_rawmidi *rmidi;
545 struct module *module;
546
547 rfile = file->private_data;
548 rmidi = rfile->rmidi;
549 rawmidi_release_priv(rfile);
550 kfree(rfile);
551 module = rmidi->card->module;
552 snd_card_file_remove(rmidi->card, file);
553 module_put(module);
554 return 0;
555 }
556
557 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
558 struct snd_rawmidi_info *info)
559 {
560 struct snd_rawmidi *rmidi;
561
562 if (substream == NULL)
563 return -ENODEV;
564 rmidi = substream->rmidi;
565 memset(info, 0, sizeof(*info));
566 info->card = rmidi->card->number;
567 info->device = rmidi->device;
568 info->subdevice = substream->number;
569 info->stream = substream->stream;
570 info->flags = rmidi->info_flags;
571 strcpy(info->id, rmidi->id);
572 strcpy(info->name, rmidi->name);
573 strcpy(info->subname, substream->name);
574 info->subdevices_count = substream->pstr->substream_count;
575 info->subdevices_avail = (substream->pstr->substream_count -
576 substream->pstr->substream_opened);
577 return 0;
578 }
579
580 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
581 struct snd_rawmidi_info __user * _info)
582 {
583 struct snd_rawmidi_info info;
584 int err;
585 if ((err = snd_rawmidi_info(substream, &info)) < 0)
586 return err;
587 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
588 return -EFAULT;
589 return 0;
590 }
591
592 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
593 {
594 struct snd_rawmidi *rmidi;
595 struct snd_rawmidi_str *pstr;
596 struct snd_rawmidi_substream *substream;
597
598 mutex_lock(&register_mutex);
599 rmidi = snd_rawmidi_search(card, info->device);
600 mutex_unlock(&register_mutex);
601 if (!rmidi)
602 return -ENXIO;
603 if (info->stream < 0 || info->stream > 1)
604 return -EINVAL;
605 pstr = &rmidi->streams[info->stream];
606 if (pstr->substream_count == 0)
607 return -ENOENT;
608 if (info->subdevice >= pstr->substream_count)
609 return -ENXIO;
610 list_for_each_entry(substream, &pstr->substreams, list) {
611 if ((unsigned int)substream->number == info->subdevice)
612 return snd_rawmidi_info(substream, info);
613 }
614 return -ENXIO;
615 }
616 EXPORT_SYMBOL(snd_rawmidi_info_select);
617
618 static int snd_rawmidi_info_select_user(struct snd_card *card,
619 struct snd_rawmidi_info __user *_info)
620 {
621 int err;
622 struct snd_rawmidi_info info;
623 if (get_user(info.device, &_info->device))
624 return -EFAULT;
625 if (get_user(info.stream, &_info->stream))
626 return -EFAULT;
627 if (get_user(info.subdevice, &_info->subdevice))
628 return -EFAULT;
629 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
630 return err;
631 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
632 return -EFAULT;
633 return 0;
634 }
635
636 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
637 struct snd_rawmidi_params * params)
638 {
639 char *newbuf;
640 struct snd_rawmidi_runtime *runtime = substream->runtime;
641
642 if (substream->append && substream->use_count > 1)
643 return -EBUSY;
644 snd_rawmidi_drain_output(substream);
645 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
646 return -EINVAL;
647 }
648 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
649 return -EINVAL;
650 }
651 if (params->buffer_size != runtime->buffer_size) {
652 newbuf = krealloc(runtime->buffer, params->buffer_size,
653 GFP_KERNEL);
654 if (!newbuf)
655 return -ENOMEM;
656 runtime->buffer = newbuf;
657 runtime->buffer_size = params->buffer_size;
658 runtime->avail = runtime->buffer_size;
659 }
660 runtime->avail_min = params->avail_min;
661 substream->active_sensing = !params->no_active_sensing;
662 return 0;
663 }
664 EXPORT_SYMBOL(snd_rawmidi_output_params);
665
666 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
667 struct snd_rawmidi_params * params)
668 {
669 char *newbuf;
670 struct snd_rawmidi_runtime *runtime = substream->runtime;
671
672 snd_rawmidi_drain_input(substream);
673 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
674 return -EINVAL;
675 }
676 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
677 return -EINVAL;
678 }
679 if (params->buffer_size != runtime->buffer_size) {
680 newbuf = krealloc(runtime->buffer, params->buffer_size,
681 GFP_KERNEL);
682 if (!newbuf)
683 return -ENOMEM;
684 runtime->buffer = newbuf;
685 runtime->buffer_size = params->buffer_size;
686 }
687 runtime->avail_min = params->avail_min;
688 return 0;
689 }
690 EXPORT_SYMBOL(snd_rawmidi_input_params);
691
692 static int snd_rawmidi_output_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_OUTPUT;
699 spin_lock_irq(&runtime->lock);
700 status->avail = runtime->avail;
701 spin_unlock_irq(&runtime->lock);
702 return 0;
703 }
704
705 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
706 struct snd_rawmidi_status * status)
707 {
708 struct snd_rawmidi_runtime *runtime = substream->runtime;
709
710 memset(status, 0, sizeof(*status));
711 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
712 spin_lock_irq(&runtime->lock);
713 status->avail = runtime->avail;
714 status->xruns = runtime->xruns;
715 runtime->xruns = 0;
716 spin_unlock_irq(&runtime->lock);
717 return 0;
718 }
719
720 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
721 {
722 struct snd_rawmidi_file *rfile;
723 void __user *argp = (void __user *)arg;
724
725 rfile = file->private_data;
726 if (((cmd >> 8) & 0xff) != 'W')
727 return -ENOTTY;
728 switch (cmd) {
729 case SNDRV_RAWMIDI_IOCTL_PVERSION:
730 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
731 case SNDRV_RAWMIDI_IOCTL_INFO:
732 {
733 int stream;
734 struct snd_rawmidi_info __user *info = argp;
735 if (get_user(stream, &info->stream))
736 return -EFAULT;
737 switch (stream) {
738 case SNDRV_RAWMIDI_STREAM_INPUT:
739 return snd_rawmidi_info_user(rfile->input, info);
740 case SNDRV_RAWMIDI_STREAM_OUTPUT:
741 return snd_rawmidi_info_user(rfile->output, info);
742 default:
743 return -EINVAL;
744 }
745 }
746 case SNDRV_RAWMIDI_IOCTL_PARAMS:
747 {
748 struct snd_rawmidi_params params;
749 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
750 return -EFAULT;
751 switch (params.stream) {
752 case SNDRV_RAWMIDI_STREAM_OUTPUT:
753 if (rfile->output == NULL)
754 return -EINVAL;
755 return snd_rawmidi_output_params(rfile->output, &params);
756 case SNDRV_RAWMIDI_STREAM_INPUT:
757 if (rfile->input == NULL)
758 return -EINVAL;
759 return snd_rawmidi_input_params(rfile->input, &params);
760 default:
761 return -EINVAL;
762 }
763 }
764 case SNDRV_RAWMIDI_IOCTL_STATUS:
765 {
766 int err = 0;
767 struct snd_rawmidi_status status;
768 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
769 return -EFAULT;
770 switch (status.stream) {
771 case SNDRV_RAWMIDI_STREAM_OUTPUT:
772 if (rfile->output == NULL)
773 return -EINVAL;
774 err = snd_rawmidi_output_status(rfile->output, &status);
775 break;
776 case SNDRV_RAWMIDI_STREAM_INPUT:
777 if (rfile->input == NULL)
778 return -EINVAL;
779 err = snd_rawmidi_input_status(rfile->input, &status);
780 break;
781 default:
782 return -EINVAL;
783 }
784 if (err < 0)
785 return err;
786 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
787 return -EFAULT;
788 return 0;
789 }
790 case SNDRV_RAWMIDI_IOCTL_DROP:
791 {
792 int val;
793 if (get_user(val, (int __user *) argp))
794 return -EFAULT;
795 switch (val) {
796 case SNDRV_RAWMIDI_STREAM_OUTPUT:
797 if (rfile->output == NULL)
798 return -EINVAL;
799 return snd_rawmidi_drop_output(rfile->output);
800 default:
801 return -EINVAL;
802 }
803 }
804 case SNDRV_RAWMIDI_IOCTL_DRAIN:
805 {
806 int val;
807 if (get_user(val, (int __user *) argp))
808 return -EFAULT;
809 switch (val) {
810 case SNDRV_RAWMIDI_STREAM_OUTPUT:
811 if (rfile->output == NULL)
812 return -EINVAL;
813 return snd_rawmidi_drain_output(rfile->output);
814 case SNDRV_RAWMIDI_STREAM_INPUT:
815 if (rfile->input == NULL)
816 return -EINVAL;
817 return snd_rawmidi_drain_input(rfile->input);
818 default:
819 return -EINVAL;
820 }
821 }
822 default:
823 rmidi_dbg(rfile->rmidi,
824 "rawmidi: unknown command = 0x%x\n", cmd);
825 }
826 return -ENOTTY;
827 }
828
829 static int snd_rawmidi_control_ioctl(struct snd_card *card,
830 struct snd_ctl_file *control,
831 unsigned int cmd,
832 unsigned long arg)
833 {
834 void __user *argp = (void __user *)arg;
835
836 switch (cmd) {
837 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
838 {
839 int device;
840
841 if (get_user(device, (int __user *)argp))
842 return -EFAULT;
843 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
844 device = SNDRV_RAWMIDI_DEVICES - 1;
845 mutex_lock(&register_mutex);
846 device = device < 0 ? 0 : device + 1;
847 while (device < SNDRV_RAWMIDI_DEVICES) {
848 if (snd_rawmidi_search(card, device))
849 break;
850 device++;
851 }
852 if (device == SNDRV_RAWMIDI_DEVICES)
853 device = -1;
854 mutex_unlock(&register_mutex);
855 if (put_user(device, (int __user *)argp))
856 return -EFAULT;
857 return 0;
858 }
859 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
860 {
861 int val;
862
863 if (get_user(val, (int __user *)argp))
864 return -EFAULT;
865 control->prefer_rawmidi_subdevice = val;
866 return 0;
867 }
868 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
869 return snd_rawmidi_info_select_user(card, argp);
870 }
871 return -ENOIOCTLCMD;
872 }
873
874 /**
875 * snd_rawmidi_receive - receive the input data from the device
876 * @substream: the rawmidi substream
877 * @buffer: the buffer pointer
878 * @count: the data size to read
879 *
880 * Reads the data from the internal buffer.
881 *
882 * Return: The size of read data, or a negative error code on failure.
883 */
884 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
885 const unsigned char *buffer, int count)
886 {
887 unsigned long flags;
888 int result = 0, count1;
889 struct snd_rawmidi_runtime *runtime = substream->runtime;
890
891 if (!substream->opened)
892 return -EBADFD;
893 if (runtime->buffer == NULL) {
894 rmidi_dbg(substream->rmidi,
895 "snd_rawmidi_receive: input is not active!!!\n");
896 return -EINVAL;
897 }
898 spin_lock_irqsave(&runtime->lock, flags);
899 if (count == 1) { /* special case, faster code */
900 substream->bytes++;
901 if (runtime->avail < runtime->buffer_size) {
902 runtime->buffer[runtime->hw_ptr++] = buffer[0];
903 runtime->hw_ptr %= runtime->buffer_size;
904 runtime->avail++;
905 result++;
906 } else {
907 runtime->xruns++;
908 }
909 } else {
910 substream->bytes += count;
911 count1 = runtime->buffer_size - runtime->hw_ptr;
912 if (count1 > count)
913 count1 = count;
914 if (count1 > (int)(runtime->buffer_size - runtime->avail))
915 count1 = runtime->buffer_size - runtime->avail;
916 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
917 runtime->hw_ptr += count1;
918 runtime->hw_ptr %= runtime->buffer_size;
919 runtime->avail += count1;
920 count -= count1;
921 result += count1;
922 if (count > 0) {
923 buffer += count1;
924 count1 = count;
925 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
926 count1 = runtime->buffer_size - runtime->avail;
927 runtime->xruns += count - count1;
928 }
929 if (count1 > 0) {
930 memcpy(runtime->buffer, buffer, count1);
931 runtime->hw_ptr = count1;
932 runtime->avail += count1;
933 result += count1;
934 }
935 }
936 }
937 if (result > 0) {
938 if (runtime->event)
939 schedule_work(&runtime->event_work);
940 else if (snd_rawmidi_ready(substream))
941 wake_up(&runtime->sleep);
942 }
943 spin_unlock_irqrestore(&runtime->lock, flags);
944 return result;
945 }
946 EXPORT_SYMBOL(snd_rawmidi_receive);
947
948 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
949 unsigned char __user *userbuf,
950 unsigned char *kernelbuf, long count)
951 {
952 unsigned long flags;
953 long result = 0, count1;
954 struct snd_rawmidi_runtime *runtime = substream->runtime;
955 unsigned long appl_ptr;
956
957 spin_lock_irqsave(&runtime->lock, flags);
958 while (count > 0 && runtime->avail) {
959 count1 = runtime->buffer_size - runtime->appl_ptr;
960 if (count1 > count)
961 count1 = count;
962 if (count1 > (int)runtime->avail)
963 count1 = runtime->avail;
964
965 /* update runtime->appl_ptr before unlocking for userbuf */
966 appl_ptr = runtime->appl_ptr;
967 runtime->appl_ptr += count1;
968 runtime->appl_ptr %= runtime->buffer_size;
969 runtime->avail -= count1;
970
971 if (kernelbuf)
972 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
973 if (userbuf) {
974 spin_unlock_irqrestore(&runtime->lock, flags);
975 if (copy_to_user(userbuf + result,
976 runtime->buffer + appl_ptr, count1)) {
977 return result > 0 ? result : -EFAULT;
978 }
979 spin_lock_irqsave(&runtime->lock, flags);
980 }
981 result += count1;
982 count -= count1;
983 }
984 spin_unlock_irqrestore(&runtime->lock, flags);
985 return result;
986 }
987
988 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
989 unsigned char *buf, long count)
990 {
991 snd_rawmidi_input_trigger(substream, 1);
992 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
993 }
994 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
995
996 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
997 loff_t *offset)
998 {
999 long result;
1000 int count1;
1001 struct snd_rawmidi_file *rfile;
1002 struct snd_rawmidi_substream *substream;
1003 struct snd_rawmidi_runtime *runtime;
1004
1005 rfile = file->private_data;
1006 substream = rfile->input;
1007 if (substream == NULL)
1008 return -EIO;
1009 runtime = substream->runtime;
1010 snd_rawmidi_input_trigger(substream, 1);
1011 result = 0;
1012 while (count > 0) {
1013 spin_lock_irq(&runtime->lock);
1014 while (!snd_rawmidi_ready(substream)) {
1015 wait_queue_t wait;
1016 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1017 spin_unlock_irq(&runtime->lock);
1018 return result > 0 ? result : -EAGAIN;
1019 }
1020 init_waitqueue_entry(&wait, current);
1021 add_wait_queue(&runtime->sleep, &wait);
1022 set_current_state(TASK_INTERRUPTIBLE);
1023 spin_unlock_irq(&runtime->lock);
1024 schedule();
1025 remove_wait_queue(&runtime->sleep, &wait);
1026 if (rfile->rmidi->card->shutdown)
1027 return -ENODEV;
1028 if (signal_pending(current))
1029 return result > 0 ? result : -ERESTARTSYS;
1030 if (!runtime->avail)
1031 return result > 0 ? result : -EIO;
1032 spin_lock_irq(&runtime->lock);
1033 }
1034 spin_unlock_irq(&runtime->lock);
1035 count1 = snd_rawmidi_kernel_read1(substream,
1036 (unsigned char __user *)buf,
1037 NULL/*kernelbuf*/,
1038 count);
1039 if (count1 < 0)
1040 return result > 0 ? result : count1;
1041 result += count1;
1042 buf += count1;
1043 count -= count1;
1044 }
1045 return result;
1046 }
1047
1048 /**
1049 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1050 * @substream: the rawmidi substream
1051 *
1052 * Return: 1 if the internal output buffer is empty, 0 if not.
1053 */
1054 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1055 {
1056 struct snd_rawmidi_runtime *runtime = substream->runtime;
1057 int result;
1058 unsigned long flags;
1059
1060 if (runtime->buffer == NULL) {
1061 rmidi_dbg(substream->rmidi,
1062 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1063 return 1;
1064 }
1065 spin_lock_irqsave(&runtime->lock, flags);
1066 result = runtime->avail >= runtime->buffer_size;
1067 spin_unlock_irqrestore(&runtime->lock, flags);
1068 return result;
1069 }
1070 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1071
1072 /**
1073 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1074 * @substream: the rawmidi substream
1075 * @buffer: the buffer pointer
1076 * @count: data size to transfer
1077 *
1078 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1079 */
1080 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1081 unsigned char *buffer, int count)
1082 {
1083 int result, count1;
1084 struct snd_rawmidi_runtime *runtime = substream->runtime;
1085
1086 if (runtime->buffer == NULL) {
1087 rmidi_dbg(substream->rmidi,
1088 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1089 return -EINVAL;
1090 }
1091 result = 0;
1092 if (runtime->avail >= runtime->buffer_size) {
1093 /* warning: lowlevel layer MUST trigger down the hardware */
1094 goto __skip;
1095 }
1096 if (count == 1) { /* special case, faster code */
1097 *buffer = runtime->buffer[runtime->hw_ptr];
1098 result++;
1099 } else {
1100 count1 = runtime->buffer_size - runtime->hw_ptr;
1101 if (count1 > count)
1102 count1 = count;
1103 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1104 count1 = runtime->buffer_size - runtime->avail;
1105 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1106 count -= count1;
1107 result += count1;
1108 if (count > 0) {
1109 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1110 count = runtime->buffer_size - runtime->avail - count1;
1111 memcpy(buffer + count1, runtime->buffer, count);
1112 result += count;
1113 }
1114 }
1115 __skip:
1116 return result;
1117 }
1118 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1119
1120 /**
1121 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1122 * @substream: the rawmidi substream
1123 * @buffer: the buffer pointer
1124 * @count: data size to transfer
1125 *
1126 * Copies data from the internal output buffer to the given buffer.
1127 *
1128 * Call this in the interrupt handler when the midi output is ready,
1129 * and call snd_rawmidi_transmit_ack() after the transmission is
1130 * finished.
1131 *
1132 * Return: The size of copied data, or a negative error code on failure.
1133 */
1134 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1135 unsigned char *buffer, int count)
1136 {
1137 struct snd_rawmidi_runtime *runtime = substream->runtime;
1138 int result;
1139 unsigned long flags;
1140
1141 spin_lock_irqsave(&runtime->lock, flags);
1142 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1143 spin_unlock_irqrestore(&runtime->lock, flags);
1144 return result;
1145 }
1146 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1147
1148 /**
1149 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1150 * @substream: the rawmidi substream
1151 * @count: the transferred count
1152 *
1153 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1154 */
1155 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1156 {
1157 struct snd_rawmidi_runtime *runtime = substream->runtime;
1158
1159 if (runtime->buffer == NULL) {
1160 rmidi_dbg(substream->rmidi,
1161 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1162 return -EINVAL;
1163 }
1164 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1165 runtime->hw_ptr += count;
1166 runtime->hw_ptr %= runtime->buffer_size;
1167 runtime->avail += count;
1168 substream->bytes += count;
1169 if (count > 0) {
1170 if (runtime->drain || snd_rawmidi_ready(substream))
1171 wake_up(&runtime->sleep);
1172 }
1173 return count;
1174 }
1175 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1176
1177 /**
1178 * snd_rawmidi_transmit_ack - acknowledge the transmission
1179 * @substream: the rawmidi substream
1180 * @count: the transferred count
1181 *
1182 * Advances the hardware pointer for the internal output buffer with
1183 * the given size and updates the condition.
1184 * Call after the transmission is finished.
1185 *
1186 * Return: The advanced size if successful, or a negative error code on failure.
1187 */
1188 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1189 {
1190 struct snd_rawmidi_runtime *runtime = substream->runtime;
1191 int result;
1192 unsigned long flags;
1193
1194 spin_lock_irqsave(&runtime->lock, flags);
1195 result = __snd_rawmidi_transmit_ack(substream, count);
1196 spin_unlock_irqrestore(&runtime->lock, flags);
1197 return result;
1198 }
1199 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1200
1201 /**
1202 * snd_rawmidi_transmit - copy from the buffer to the device
1203 * @substream: the rawmidi substream
1204 * @buffer: the buffer pointer
1205 * @count: the data size to transfer
1206 *
1207 * Copies data from the buffer to the device and advances the pointer.
1208 *
1209 * Return: The copied size if successful, or a negative error code on failure.
1210 */
1211 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1212 unsigned char *buffer, int count)
1213 {
1214 struct snd_rawmidi_runtime *runtime = substream->runtime;
1215 int result;
1216 unsigned long flags;
1217
1218 spin_lock_irqsave(&runtime->lock, flags);
1219 if (!substream->opened)
1220 result = -EBADFD;
1221 else {
1222 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1223 if (count <= 0)
1224 result = count;
1225 else
1226 result = __snd_rawmidi_transmit_ack(substream, count);
1227 }
1228 spin_unlock_irqrestore(&runtime->lock, flags);
1229 return result;
1230 }
1231 EXPORT_SYMBOL(snd_rawmidi_transmit);
1232
1233 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1234 const unsigned char __user *userbuf,
1235 const unsigned char *kernelbuf,
1236 long count)
1237 {
1238 unsigned long flags;
1239 long count1, result;
1240 struct snd_rawmidi_runtime *runtime = substream->runtime;
1241 unsigned long appl_ptr;
1242
1243 if (!kernelbuf && !userbuf)
1244 return -EINVAL;
1245 if (snd_BUG_ON(!runtime->buffer))
1246 return -EINVAL;
1247
1248 result = 0;
1249 spin_lock_irqsave(&runtime->lock, flags);
1250 if (substream->append) {
1251 if ((long)runtime->avail < count) {
1252 spin_unlock_irqrestore(&runtime->lock, flags);
1253 return -EAGAIN;
1254 }
1255 }
1256 while (count > 0 && runtime->avail > 0) {
1257 count1 = runtime->buffer_size - runtime->appl_ptr;
1258 if (count1 > count)
1259 count1 = count;
1260 if (count1 > (long)runtime->avail)
1261 count1 = runtime->avail;
1262
1263 /* update runtime->appl_ptr before unlocking for userbuf */
1264 appl_ptr = runtime->appl_ptr;
1265 runtime->appl_ptr += count1;
1266 runtime->appl_ptr %= runtime->buffer_size;
1267 runtime->avail -= count1;
1268
1269 if (kernelbuf)
1270 memcpy(runtime->buffer + appl_ptr,
1271 kernelbuf + result, count1);
1272 else if (userbuf) {
1273 spin_unlock_irqrestore(&runtime->lock, flags);
1274 if (copy_from_user(runtime->buffer + appl_ptr,
1275 userbuf + result, count1)) {
1276 spin_lock_irqsave(&runtime->lock, flags);
1277 result = result > 0 ? result : -EFAULT;
1278 goto __end;
1279 }
1280 spin_lock_irqsave(&runtime->lock, flags);
1281 }
1282 result += count1;
1283 count -= count1;
1284 }
1285 __end:
1286 count1 = runtime->avail < runtime->buffer_size;
1287 spin_unlock_irqrestore(&runtime->lock, flags);
1288 if (count1)
1289 snd_rawmidi_output_trigger(substream, 1);
1290 return result;
1291 }
1292
1293 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1294 const unsigned char *buf, long count)
1295 {
1296 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1297 }
1298 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1299
1300 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1301 size_t count, loff_t *offset)
1302 {
1303 long result, timeout;
1304 int count1;
1305 struct snd_rawmidi_file *rfile;
1306 struct snd_rawmidi_runtime *runtime;
1307 struct snd_rawmidi_substream *substream;
1308
1309 rfile = file->private_data;
1310 substream = rfile->output;
1311 runtime = substream->runtime;
1312 /* we cannot put an atomic message to our buffer */
1313 if (substream->append && count > runtime->buffer_size)
1314 return -EIO;
1315 result = 0;
1316 while (count > 0) {
1317 spin_lock_irq(&runtime->lock);
1318 while (!snd_rawmidi_ready_append(substream, count)) {
1319 wait_queue_t wait;
1320 if (file->f_flags & O_NONBLOCK) {
1321 spin_unlock_irq(&runtime->lock);
1322 return result > 0 ? result : -EAGAIN;
1323 }
1324 init_waitqueue_entry(&wait, current);
1325 add_wait_queue(&runtime->sleep, &wait);
1326 set_current_state(TASK_INTERRUPTIBLE);
1327 spin_unlock_irq(&runtime->lock);
1328 timeout = schedule_timeout(30 * HZ);
1329 remove_wait_queue(&runtime->sleep, &wait);
1330 if (rfile->rmidi->card->shutdown)
1331 return -ENODEV;
1332 if (signal_pending(current))
1333 return result > 0 ? result : -ERESTARTSYS;
1334 if (!runtime->avail && !timeout)
1335 return result > 0 ? result : -EIO;
1336 spin_lock_irq(&runtime->lock);
1337 }
1338 spin_unlock_irq(&runtime->lock);
1339 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1340 if (count1 < 0)
1341 return result > 0 ? result : count1;
1342 result += count1;
1343 buf += count1;
1344 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1345 break;
1346 count -= count1;
1347 }
1348 if (file->f_flags & O_DSYNC) {
1349 spin_lock_irq(&runtime->lock);
1350 while (runtime->avail != runtime->buffer_size) {
1351 wait_queue_t wait;
1352 unsigned int last_avail = runtime->avail;
1353 init_waitqueue_entry(&wait, current);
1354 add_wait_queue(&runtime->sleep, &wait);
1355 set_current_state(TASK_INTERRUPTIBLE);
1356 spin_unlock_irq(&runtime->lock);
1357 timeout = schedule_timeout(30 * HZ);
1358 remove_wait_queue(&runtime->sleep, &wait);
1359 if (signal_pending(current))
1360 return result > 0 ? result : -ERESTARTSYS;
1361 if (runtime->avail == last_avail && !timeout)
1362 return result > 0 ? result : -EIO;
1363 spin_lock_irq(&runtime->lock);
1364 }
1365 spin_unlock_irq(&runtime->lock);
1366 }
1367 return result;
1368 }
1369
1370 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1371 {
1372 struct snd_rawmidi_file *rfile;
1373 struct snd_rawmidi_runtime *runtime;
1374 unsigned int mask;
1375
1376 rfile = file->private_data;
1377 if (rfile->input != NULL) {
1378 runtime = rfile->input->runtime;
1379 snd_rawmidi_input_trigger(rfile->input, 1);
1380 poll_wait(file, &runtime->sleep, wait);
1381 }
1382 if (rfile->output != NULL) {
1383 runtime = rfile->output->runtime;
1384 poll_wait(file, &runtime->sleep, wait);
1385 }
1386 mask = 0;
1387 if (rfile->input != NULL) {
1388 if (snd_rawmidi_ready(rfile->input))
1389 mask |= POLLIN | POLLRDNORM;
1390 }
1391 if (rfile->output != NULL) {
1392 if (snd_rawmidi_ready(rfile->output))
1393 mask |= POLLOUT | POLLWRNORM;
1394 }
1395 return mask;
1396 }
1397
1398 /*
1399 */
1400 #ifdef CONFIG_COMPAT
1401 #include "rawmidi_compat.c"
1402 #else
1403 #define snd_rawmidi_ioctl_compat NULL
1404 #endif
1405
1406 /*
1407
1408 */
1409
1410 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1411 struct snd_info_buffer *buffer)
1412 {
1413 struct snd_rawmidi *rmidi;
1414 struct snd_rawmidi_substream *substream;
1415 struct snd_rawmidi_runtime *runtime;
1416
1417 rmidi = entry->private_data;
1418 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1419 mutex_lock(&rmidi->open_mutex);
1420 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1421 list_for_each_entry(substream,
1422 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1423 list) {
1424 snd_iprintf(buffer,
1425 "Output %d\n"
1426 " Tx bytes : %lu\n",
1427 substream->number,
1428 (unsigned long) substream->bytes);
1429 if (substream->opened) {
1430 snd_iprintf(buffer,
1431 " Owner PID : %d\n",
1432 pid_vnr(substream->pid));
1433 runtime = substream->runtime;
1434 snd_iprintf(buffer,
1435 " Mode : %s\n"
1436 " Buffer size : %lu\n"
1437 " Avail : %lu\n",
1438 runtime->oss ? "OSS compatible" : "native",
1439 (unsigned long) runtime->buffer_size,
1440 (unsigned long) runtime->avail);
1441 }
1442 }
1443 }
1444 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1445 list_for_each_entry(substream,
1446 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1447 list) {
1448 snd_iprintf(buffer,
1449 "Input %d\n"
1450 " Rx bytes : %lu\n",
1451 substream->number,
1452 (unsigned long) substream->bytes);
1453 if (substream->opened) {
1454 snd_iprintf(buffer,
1455 " Owner PID : %d\n",
1456 pid_vnr(substream->pid));
1457 runtime = substream->runtime;
1458 snd_iprintf(buffer,
1459 " Buffer size : %lu\n"
1460 " Avail : %lu\n"
1461 " Overruns : %lu\n",
1462 (unsigned long) runtime->buffer_size,
1463 (unsigned long) runtime->avail,
1464 (unsigned long) runtime->xruns);
1465 }
1466 }
1467 }
1468 mutex_unlock(&rmidi->open_mutex);
1469 }
1470
1471 /*
1472 * Register functions
1473 */
1474
1475 static const struct file_operations snd_rawmidi_f_ops =
1476 {
1477 .owner = THIS_MODULE,
1478 .read = snd_rawmidi_read,
1479 .write = snd_rawmidi_write,
1480 .open = snd_rawmidi_open,
1481 .release = snd_rawmidi_release,
1482 .llseek = no_llseek,
1483 .poll = snd_rawmidi_poll,
1484 .unlocked_ioctl = snd_rawmidi_ioctl,
1485 .compat_ioctl = snd_rawmidi_ioctl_compat,
1486 };
1487
1488 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1489 struct snd_rawmidi_str *stream,
1490 int direction,
1491 int count)
1492 {
1493 struct snd_rawmidi_substream *substream;
1494 int idx;
1495
1496 for (idx = 0; idx < count; idx++) {
1497 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1498 if (substream == NULL) {
1499 rmidi_err(rmidi, "rawmidi: cannot allocate substream\n");
1500 return -ENOMEM;
1501 }
1502 substream->stream = direction;
1503 substream->number = idx;
1504 substream->rmidi = rmidi;
1505 substream->pstr = stream;
1506 list_add_tail(&substream->list, &stream->substreams);
1507 stream->substream_count++;
1508 }
1509 return 0;
1510 }
1511
1512 /**
1513 * snd_rawmidi_new - create a rawmidi instance
1514 * @card: the card instance
1515 * @id: the id string
1516 * @device: the device index
1517 * @output_count: the number of output streams
1518 * @input_count: the number of input streams
1519 * @rrawmidi: the pointer to store the new rawmidi instance
1520 *
1521 * Creates a new rawmidi instance.
1522 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1523 *
1524 * Return: Zero if successful, or a negative error code on failure.
1525 */
1526 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1527 int output_count, int input_count,
1528 struct snd_rawmidi ** rrawmidi)
1529 {
1530 struct snd_rawmidi *rmidi;
1531 int err;
1532 static struct snd_device_ops ops = {
1533 .dev_free = snd_rawmidi_dev_free,
1534 .dev_register = snd_rawmidi_dev_register,
1535 .dev_disconnect = snd_rawmidi_dev_disconnect,
1536 };
1537
1538 if (snd_BUG_ON(!card))
1539 return -ENXIO;
1540 if (rrawmidi)
1541 *rrawmidi = NULL;
1542 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1543 if (rmidi == NULL) {
1544 dev_err(card->dev, "rawmidi: cannot allocate\n");
1545 return -ENOMEM;
1546 }
1547 rmidi->card = card;
1548 rmidi->device = device;
1549 mutex_init(&rmidi->open_mutex);
1550 init_waitqueue_head(&rmidi->open_wait);
1551 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1552 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1553
1554 if (id != NULL)
1555 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1556 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1557 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1558 SNDRV_RAWMIDI_STREAM_INPUT,
1559 input_count)) < 0) {
1560 snd_rawmidi_free(rmidi);
1561 return err;
1562 }
1563 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1564 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1565 SNDRV_RAWMIDI_STREAM_OUTPUT,
1566 output_count)) < 0) {
1567 snd_rawmidi_free(rmidi);
1568 return err;
1569 }
1570 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1571 snd_rawmidi_free(rmidi);
1572 return err;
1573 }
1574 if (rrawmidi)
1575 *rrawmidi = rmidi;
1576 return 0;
1577 }
1578 EXPORT_SYMBOL(snd_rawmidi_new);
1579
1580 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1581 {
1582 struct snd_rawmidi_substream *substream;
1583
1584 while (!list_empty(&stream->substreams)) {
1585 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1586 list_del(&substream->list);
1587 kfree(substream);
1588 }
1589 }
1590
1591 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1592 {
1593 if (!rmidi)
1594 return 0;
1595
1596 snd_info_free_entry(rmidi->proc_entry);
1597 rmidi->proc_entry = NULL;
1598 mutex_lock(&register_mutex);
1599 if (rmidi->ops && rmidi->ops->dev_unregister)
1600 rmidi->ops->dev_unregister(rmidi);
1601 mutex_unlock(&register_mutex);
1602
1603 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1604 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1605 if (rmidi->private_free)
1606 rmidi->private_free(rmidi);
1607 kfree(rmidi);
1608 return 0;
1609 }
1610
1611 static int snd_rawmidi_dev_free(struct snd_device *device)
1612 {
1613 struct snd_rawmidi *rmidi = device->device_data;
1614 return snd_rawmidi_free(rmidi);
1615 }
1616
1617 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1618 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1619 {
1620 struct snd_rawmidi *rmidi = device->private_data;
1621 rmidi->seq_dev = NULL;
1622 }
1623 #endif
1624
1625 static int snd_rawmidi_dev_register(struct snd_device *device)
1626 {
1627 int err;
1628 struct snd_info_entry *entry;
1629 char name[16];
1630 struct snd_rawmidi *rmidi = device->device_data;
1631
1632 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1633 return -ENOMEM;
1634 mutex_lock(&register_mutex);
1635 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1636 mutex_unlock(&register_mutex);
1637 return -EBUSY;
1638 }
1639 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1640 mutex_unlock(&register_mutex);
1641 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1642 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1643 rmidi->card, rmidi->device,
1644 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1645 rmidi_err(rmidi, "unable to register rawmidi device %i:%i\n",
1646 rmidi->card->number, rmidi->device);
1647 mutex_lock(&register_mutex);
1648 list_del(&rmidi->list);
1649 mutex_unlock(&register_mutex);
1650 return err;
1651 }
1652 if (rmidi->ops && rmidi->ops->dev_register &&
1653 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1654 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1655 mutex_lock(&register_mutex);
1656 list_del(&rmidi->list);
1657 mutex_unlock(&register_mutex);
1658 return err;
1659 }
1660 #ifdef CONFIG_SND_OSSEMUL
1661 rmidi->ossreg = 0;
1662 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1663 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1664 rmidi->card, 0, &snd_rawmidi_f_ops,
1665 rmidi) < 0) {
1666 rmidi_err(rmidi,
1667 "unable to register OSS rawmidi device %i:%i\n",
1668 rmidi->card->number, 0);
1669 } else {
1670 rmidi->ossreg++;
1671 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1672 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1673 #endif
1674 }
1675 }
1676 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1677 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1678 rmidi->card, 1, &snd_rawmidi_f_ops,
1679 rmidi) < 0) {
1680 rmidi_err(rmidi,
1681 "unable to register OSS rawmidi device %i:%i\n",
1682 rmidi->card->number, 1);
1683 } else {
1684 rmidi->ossreg++;
1685 }
1686 }
1687 #endif /* CONFIG_SND_OSSEMUL */
1688 sprintf(name, "midi%d", rmidi->device);
1689 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1690 if (entry) {
1691 entry->private_data = rmidi;
1692 entry->c.text.read = snd_rawmidi_proc_info_read;
1693 if (snd_info_register(entry) < 0) {
1694 snd_info_free_entry(entry);
1695 entry = NULL;
1696 }
1697 }
1698 rmidi->proc_entry = entry;
1699 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1700 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1701 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1702 rmidi->seq_dev->private_data = rmidi;
1703 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1704 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1705 snd_device_register(rmidi->card, rmidi->seq_dev);
1706 }
1707 }
1708 #endif
1709 return 0;
1710 }
1711
1712 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1713 {
1714 struct snd_rawmidi *rmidi = device->device_data;
1715 int dir;
1716
1717 mutex_lock(&register_mutex);
1718 mutex_lock(&rmidi->open_mutex);
1719 wake_up(&rmidi->open_wait);
1720 list_del_init(&rmidi->list);
1721 for (dir = 0; dir < 2; dir++) {
1722 struct snd_rawmidi_substream *s;
1723 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1724 if (s->runtime)
1725 wake_up(&s->runtime->sleep);
1726 }
1727 }
1728
1729 #ifdef CONFIG_SND_OSSEMUL
1730 if (rmidi->ossreg) {
1731 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1732 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1733 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1734 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1735 #endif
1736 }
1737 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1738 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1739 rmidi->ossreg = 0;
1740 }
1741 #endif /* CONFIG_SND_OSSEMUL */
1742 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1743 mutex_unlock(&rmidi->open_mutex);
1744 mutex_unlock(&register_mutex);
1745 return 0;
1746 }
1747
1748 /**
1749 * snd_rawmidi_set_ops - set the rawmidi operators
1750 * @rmidi: the rawmidi instance
1751 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1752 * @ops: the operator table
1753 *
1754 * Sets the rawmidi operators for the given stream direction.
1755 */
1756 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1757 struct snd_rawmidi_ops *ops)
1758 {
1759 struct snd_rawmidi_substream *substream;
1760
1761 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1762 substream->ops = ops;
1763 }
1764 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1765
1766 /*
1767 * ENTRY functions
1768 */
1769
1770 static int __init alsa_rawmidi_init(void)
1771 {
1772
1773 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1774 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1775 #ifdef CONFIG_SND_OSSEMUL
1776 { int i;
1777 /* check device map table */
1778 for (i = 0; i < SNDRV_CARDS; i++) {
1779 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1780 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1781 i, midi_map[i]);
1782 midi_map[i] = 0;
1783 }
1784 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1785 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1786 i, amidi_map[i]);
1787 amidi_map[i] = 1;
1788 }
1789 }
1790 }
1791 #endif /* CONFIG_SND_OSSEMUL */
1792 return 0;
1793 }
1794
1795 static void __exit alsa_rawmidi_exit(void)
1796 {
1797 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1798 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1799 }
1800
1801 module_init(alsa_rawmidi_init)
1802 module_exit(alsa_rawmidi_exit)
Linux with added FPC-III support