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net: cpu offline cause napi stall
[linux/fpc-iii.git] / sound / core / rawmidi.c
blobcbbed0db9e560315ae0559c7e5e97786387a5371
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
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 static 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
69 static 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
81 static 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
87 static 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
95 static void snd_rawmidi_input_event_tasklet(unsigned long data)
96 {
97 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
98 substream->runtime->event(substream);
99 }
100
101 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
102 {
103 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
104 substream->ops->trigger(substream, 1);
105 }
106
107 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
108 {
109 struct snd_rawmidi_runtime *runtime;
110
111 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
112 return -ENOMEM;
113 spin_lock_init(&runtime->lock);
114 init_waitqueue_head(&runtime->sleep);
115 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
116 tasklet_init(&runtime->tasklet,
117 snd_rawmidi_input_event_tasklet,
118 (unsigned long)substream);
119 else
120 tasklet_init(&runtime->tasklet,
121 snd_rawmidi_output_trigger_tasklet,
122 (unsigned long)substream);
123 runtime->event = NULL;
124 runtime->buffer_size = PAGE_SIZE;
125 runtime->avail_min = 1;
126 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
127 runtime->avail = 0;
128 else
129 runtime->avail = runtime->buffer_size;
130 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
131 kfree(runtime);
132 return -ENOMEM;
133 }
134 runtime->appl_ptr = runtime->hw_ptr = 0;
135 substream->runtime = runtime;
136 return 0;
137 }
138
139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
140 {
141 struct snd_rawmidi_runtime *runtime = substream->runtime;
142
143 kfree(runtime->buffer);
144 kfree(runtime);
145 substream->runtime = NULL;
146 return 0;
147 }
148
149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
150 {
151 if (!substream->opened)
152 return;
153 if (up) {
154 tasklet_schedule(&substream->runtime->tasklet);
155 } else {
156 tasklet_kill(&substream->runtime->tasklet);
157 substream->ops->trigger(substream, 0);
158 }
159 }
160
161 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
162 {
163 if (!substream->opened)
164 return;
165 substream->ops->trigger(substream, up);
166 if (!up && substream->runtime->event)
167 tasklet_kill(&substream->runtime->tasklet);
168 }
169
170 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
171 {
172 unsigned long flags;
173 struct snd_rawmidi_runtime *runtime = substream->runtime;
174
175 snd_rawmidi_output_trigger(substream, 0);
176 runtime->drain = 0;
177 spin_lock_irqsave(&runtime->lock, flags);
178 runtime->appl_ptr = runtime->hw_ptr = 0;
179 runtime->avail = runtime->buffer_size;
180 spin_unlock_irqrestore(&runtime->lock, flags);
181 return 0;
182 }
183
184 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
185 {
186 int err;
187 long timeout;
188 struct snd_rawmidi_runtime *runtime = substream->runtime;
189
190 err = 0;
191 runtime->drain = 1;
192 timeout = wait_event_interruptible_timeout(runtime->sleep,
193 (runtime->avail >= runtime->buffer_size),
194 10*HZ);
195 if (signal_pending(current))
196 err = -ERESTARTSYS;
197 if (runtime->avail < runtime->buffer_size && !timeout) {
198 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
199 err = -EIO;
200 }
201 runtime->drain = 0;
202 if (err != -ERESTARTSYS) {
203 /* we need wait a while to make sure that Tx FIFOs are empty */
204 if (substream->ops->drain)
205 substream->ops->drain(substream);
206 else
207 msleep(50);
208 snd_rawmidi_drop_output(substream);
209 }
210 return err;
211 }
212
213 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
214 {
215 unsigned long flags;
216 struct snd_rawmidi_runtime *runtime = substream->runtime;
217
218 snd_rawmidi_input_trigger(substream, 0);
219 runtime->drain = 0;
220 spin_lock_irqsave(&runtime->lock, flags);
221 runtime->appl_ptr = runtime->hw_ptr = 0;
222 runtime->avail = 0;
223 spin_unlock_irqrestore(&runtime->lock, flags);
224 return 0;
225 }
226
227 /* look for an available substream for the given stream direction;
228 * if a specific subdevice is given, try to assign it
229 */
230 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
231 int stream, int mode,
232 struct snd_rawmidi_substream **sub_ret)
233 {
234 struct snd_rawmidi_substream *substream;
235 struct snd_rawmidi_str *s = &rmidi->streams[stream];
236 static unsigned int info_flags[2] = {
237 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
238 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
239 };
240
241 if (!(rmidi->info_flags & info_flags[stream]))
242 return -ENXIO;
243 if (subdevice >= 0 && subdevice >= s->substream_count)
244 return -ENODEV;
245
246 list_for_each_entry(substream, &s->substreams, list) {
247 if (substream->opened) {
248 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
249 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
250 !substream->append)
251 continue;
252 }
253 if (subdevice < 0 || subdevice == substream->number) {
254 *sub_ret = substream;
255 return 0;
256 }
257 }
258 return -EAGAIN;
259 }
260
261 /* open and do ref-counting for the given substream */
262 static int open_substream(struct snd_rawmidi *rmidi,
263 struct snd_rawmidi_substream *substream,
264 int mode)
265 {
266 int err;
267
268 if (substream->use_count == 0) {
269 err = snd_rawmidi_runtime_create(substream);
270 if (err < 0)
271 return err;
272 err = substream->ops->open(substream);
273 if (err < 0) {
274 snd_rawmidi_runtime_free(substream);
275 return err;
276 }
277 substream->opened = 1;
278 substream->active_sensing = 0;
279 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
280 substream->append = 1;
281 substream->pid = get_pid(task_pid(current));
282 rmidi->streams[substream->stream].substream_opened++;
283 }
284 substream->use_count++;
285 return 0;
286 }
287
288 static void close_substream(struct snd_rawmidi *rmidi,
289 struct snd_rawmidi_substream *substream,
290 int cleanup);
291
292 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
293 struct snd_rawmidi_file *rfile)
294 {
295 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
296 int err;
297
298 rfile->input = rfile->output = NULL;
299 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
300 err = assign_substream(rmidi, subdevice,
301 SNDRV_RAWMIDI_STREAM_INPUT,
302 mode, &sinput);
303 if (err < 0)
304 return err;
305 }
306 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
307 err = assign_substream(rmidi, subdevice,
308 SNDRV_RAWMIDI_STREAM_OUTPUT,
309 mode, &soutput);
310 if (err < 0)
311 return err;
312 }
313
314 if (sinput) {
315 err = open_substream(rmidi, sinput, mode);
316 if (err < 0)
317 return err;
318 }
319 if (soutput) {
320 err = open_substream(rmidi, soutput, mode);
321 if (err < 0) {
322 if (sinput)
323 close_substream(rmidi, sinput, 0);
324 return err;
325 }
326 }
327
328 rfile->rmidi = rmidi;
329 rfile->input = sinput;
330 rfile->output = soutput;
331 return 0;
332 }
333
334 /* called from sound/core/seq/seq_midi.c */
335 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
336 int mode, struct snd_rawmidi_file * rfile)
337 {
338 struct snd_rawmidi *rmidi;
339 int err;
340
341 if (snd_BUG_ON(!rfile))
342 return -EINVAL;
343
344 mutex_lock(&register_mutex);
345 rmidi = snd_rawmidi_search(card, device);
346 if (rmidi == NULL) {
347 mutex_unlock(&register_mutex);
348 return -ENODEV;
349 }
350 if (!try_module_get(rmidi->card->module)) {
351 mutex_unlock(&register_mutex);
352 return -ENXIO;
353 }
354 mutex_unlock(&register_mutex);
355
356 mutex_lock(&rmidi->open_mutex);
357 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
358 mutex_unlock(&rmidi->open_mutex);
359 if (err < 0)
360 module_put(rmidi->card->module);
361 return err;
362 }
363
364 static int snd_rawmidi_open(struct inode *inode, struct file *file)
365 {
366 int maj = imajor(inode);
367 struct snd_card *card;
368 int subdevice;
369 unsigned short fflags;
370 int err;
371 struct snd_rawmidi *rmidi;
372 struct snd_rawmidi_file *rawmidi_file = NULL;
373 wait_queue_t wait;
374 struct snd_ctl_file *kctl;
375
376 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
377 return -EINVAL; /* invalid combination */
378
379 err = nonseekable_open(inode, file);
380 if (err < 0)
381 return err;
382
383 if (maj == snd_major) {
384 rmidi = snd_lookup_minor_data(iminor(inode),
385 SNDRV_DEVICE_TYPE_RAWMIDI);
386 #ifdef CONFIG_SND_OSSEMUL
387 } else if (maj == SOUND_MAJOR) {
388 rmidi = snd_lookup_oss_minor_data(iminor(inode),
389 SNDRV_OSS_DEVICE_TYPE_MIDI);
390 #endif
391 } else
392 return -ENXIO;
393
394 if (rmidi == NULL)
395 return -ENODEV;
396
397 if (!try_module_get(rmidi->card->module))
398 return -ENXIO;
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 (signal_pending(current)) {
441 err = -ERESTARTSYS;
442 break;
443 }
444 }
445 remove_wait_queue(&rmidi->open_wait, &wait);
446 if (err < 0) {
447 kfree(rawmidi_file);
448 goto __error;
449 }
450 #ifdef CONFIG_SND_OSSEMUL
451 if (rawmidi_file->input && rawmidi_file->input->runtime)
452 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
453 if (rawmidi_file->output && rawmidi_file->output->runtime)
454 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
455 #endif
456 file->private_data = rawmidi_file;
457 mutex_unlock(&rmidi->open_mutex);
458 return 0;
459
460 __error:
461 snd_card_file_remove(card, file);
462 __error_card:
463 mutex_unlock(&rmidi->open_mutex);
464 module_put(rmidi->card->module);
465 return err;
466 }
467
468 static void close_substream(struct snd_rawmidi *rmidi,
469 struct snd_rawmidi_substream *substream,
470 int cleanup)
471 {
472 if (--substream->use_count)
473 return;
474
475 if (cleanup) {
476 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
477 snd_rawmidi_input_trigger(substream, 0);
478 else {
479 if (substream->active_sensing) {
480 unsigned char buf = 0xfe;
481 /* sending single active sensing message
482 * to shut the device up
483 */
484 snd_rawmidi_kernel_write(substream, &buf, 1);
485 }
486 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
487 snd_rawmidi_output_trigger(substream, 0);
488 }
489 }
490 substream->ops->close(substream);
491 if (substream->runtime->private_free)
492 substream->runtime->private_free(substream);
493 snd_rawmidi_runtime_free(substream);
494 substream->opened = 0;
495 substream->append = 0;
496 put_pid(substream->pid);
497 substream->pid = NULL;
498 rmidi->streams[substream->stream].substream_opened--;
499 }
500
501 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
502 {
503 struct snd_rawmidi *rmidi;
504
505 rmidi = rfile->rmidi;
506 mutex_lock(&rmidi->open_mutex);
507 if (rfile->input) {
508 close_substream(rmidi, rfile->input, 1);
509 rfile->input = NULL;
510 }
511 if (rfile->output) {
512 close_substream(rmidi, rfile->output, 1);
513 rfile->output = NULL;
514 }
515 rfile->rmidi = NULL;
516 mutex_unlock(&rmidi->open_mutex);
517 wake_up(&rmidi->open_wait);
518 }
519
520 /* called from sound/core/seq/seq_midi.c */
521 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
522 {
523 struct snd_rawmidi *rmidi;
524
525 if (snd_BUG_ON(!rfile))
526 return -ENXIO;
527
528 rmidi = rfile->rmidi;
529 rawmidi_release_priv(rfile);
530 module_put(rmidi->card->module);
531 return 0;
532 }
533
534 static int snd_rawmidi_release(struct inode *inode, struct file *file)
535 {
536 struct snd_rawmidi_file *rfile;
537 struct snd_rawmidi *rmidi;
538 struct module *module;
539
540 rfile = file->private_data;
541 rmidi = rfile->rmidi;
542 rawmidi_release_priv(rfile);
543 kfree(rfile);
544 module = rmidi->card->module;
545 snd_card_file_remove(rmidi->card, file);
546 module_put(module);
547 return 0;
548 }
549
550 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
551 struct snd_rawmidi_info *info)
552 {
553 struct snd_rawmidi *rmidi;
554
555 if (substream == NULL)
556 return -ENODEV;
557 rmidi = substream->rmidi;
558 memset(info, 0, sizeof(*info));
559 info->card = rmidi->card->number;
560 info->device = rmidi->device;
561 info->subdevice = substream->number;
562 info->stream = substream->stream;
563 info->flags = rmidi->info_flags;
564 strcpy(info->id, rmidi->id);
565 strcpy(info->name, rmidi->name);
566 strcpy(info->subname, substream->name);
567 info->subdevices_count = substream->pstr->substream_count;
568 info->subdevices_avail = (substream->pstr->substream_count -
569 substream->pstr->substream_opened);
570 return 0;
571 }
572
573 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
574 struct snd_rawmidi_info __user * _info)
575 {
576 struct snd_rawmidi_info info;
577 int err;
578 if ((err = snd_rawmidi_info(substream, &info)) < 0)
579 return err;
580 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
581 return -EFAULT;
582 return 0;
583 }
584
585 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
586 {
587 struct snd_rawmidi *rmidi;
588 struct snd_rawmidi_str *pstr;
589 struct snd_rawmidi_substream *substream;
590
591 mutex_lock(&register_mutex);
592 rmidi = snd_rawmidi_search(card, info->device);
593 mutex_unlock(&register_mutex);
594 if (!rmidi)
595 return -ENXIO;
596 if (info->stream < 0 || info->stream > 1)
597 return -EINVAL;
598 pstr = &rmidi->streams[info->stream];
599 if (pstr->substream_count == 0)
600 return -ENOENT;
601 if (info->subdevice >= pstr->substream_count)
602 return -ENXIO;
603 list_for_each_entry(substream, &pstr->substreams, list) {
604 if ((unsigned int)substream->number == info->subdevice)
605 return snd_rawmidi_info(substream, info);
606 }
607 return -ENXIO;
608 }
609
610 static int snd_rawmidi_info_select_user(struct snd_card *card,
611 struct snd_rawmidi_info __user *_info)
612 {
613 int err;
614 struct snd_rawmidi_info info;
615 if (get_user(info.device, &_info->device))
616 return -EFAULT;
617 if (get_user(info.stream, &_info->stream))
618 return -EFAULT;
619 if (get_user(info.subdevice, &_info->subdevice))
620 return -EFAULT;
621 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
622 return err;
623 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
624 return -EFAULT;
625 return 0;
626 }
627
628 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
629 struct snd_rawmidi_params * params)
630 {
631 char *newbuf;
632 struct snd_rawmidi_runtime *runtime = substream->runtime;
633
634 if (substream->append && substream->use_count > 1)
635 return -EBUSY;
636 snd_rawmidi_drain_output(substream);
637 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
638 return -EINVAL;
639 }
640 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
641 return -EINVAL;
642 }
643 if (params->buffer_size != runtime->buffer_size) {
644 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
645 if (!newbuf)
646 return -ENOMEM;
647 kfree(runtime->buffer);
648 runtime->buffer = newbuf;
649 runtime->buffer_size = params->buffer_size;
650 runtime->avail = runtime->buffer_size;
651 }
652 runtime->avail_min = params->avail_min;
653 substream->active_sensing = !params->no_active_sensing;
654 return 0;
655 }
656
657 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
658 struct snd_rawmidi_params * params)
659 {
660 char *newbuf;
661 struct snd_rawmidi_runtime *runtime = substream->runtime;
662
663 snd_rawmidi_drain_input(substream);
664 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
665 return -EINVAL;
666 }
667 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
668 return -EINVAL;
669 }
670 if (params->buffer_size != runtime->buffer_size) {
671 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
672 if (!newbuf)
673 return -ENOMEM;
674 kfree(runtime->buffer);
675 runtime->buffer = newbuf;
676 runtime->buffer_size = params->buffer_size;
677 }
678 runtime->avail_min = params->avail_min;
679 return 0;
680 }
681
682 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683 struct snd_rawmidi_status * status)
684 {
685 struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687 memset(status, 0, sizeof(*status));
688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693 }
694
695 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696 struct snd_rawmidi_status * status)
697 {
698 struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700 memset(status, 0, sizeof(*status));
701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702 spin_lock_irq(&runtime->lock);
703 status->avail = runtime->avail;
704 status->xruns = runtime->xruns;
705 runtime->xruns = 0;
706 spin_unlock_irq(&runtime->lock);
707 return 0;
708 }
709
710 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711 {
712 struct snd_rawmidi_file *rfile;
713 void __user *argp = (void __user *)arg;
714
715 rfile = file->private_data;
716 if (((cmd >> 8) & 0xff) != 'W')
717 return -ENOTTY;
718 switch (cmd) {
719 case SNDRV_RAWMIDI_IOCTL_PVERSION:
720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721 case SNDRV_RAWMIDI_IOCTL_INFO:
722 {
723 int stream;
724 struct snd_rawmidi_info __user *info = argp;
725 if (get_user(stream, &info->stream))
726 return -EFAULT;
727 switch (stream) {
728 case SNDRV_RAWMIDI_STREAM_INPUT:
729 return snd_rawmidi_info_user(rfile->input, info);
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 return snd_rawmidi_info_user(rfile->output, info);
732 default:
733 return -EINVAL;
734 }
735 }
736 case SNDRV_RAWMIDI_IOCTL_PARAMS:
737 {
738 struct snd_rawmidi_params params;
739 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
740 return -EFAULT;
741 switch (params.stream) {
742 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743 if (rfile->output == NULL)
744 return -EINVAL;
745 return snd_rawmidi_output_params(rfile->output, &params);
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 return snd_rawmidi_input_params(rfile->input, &params);
750 default:
751 return -EINVAL;
752 }
753 }
754 case SNDRV_RAWMIDI_IOCTL_STATUS:
755 {
756 int err = 0;
757 struct snd_rawmidi_status status;
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759 return -EFAULT;
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
763 return -EINVAL;
764 err = snd_rawmidi_output_status(rfile->output, &status);
765 break;
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
768 return -EINVAL;
769 err = snd_rawmidi_input_status(rfile->input, &status);
770 break;
771 default:
772 return -EINVAL;
773 }
774 if (err < 0)
775 return err;
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
783 if (get_user(val, (int __user *) argp))
784 return -EFAULT;
785 switch (val) {
786 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787 if (rfile->output == NULL)
788 return -EINVAL;
789 return snd_rawmidi_drop_output(rfile->output);
790 default:
791 return -EINVAL;
792 }
793 }
794 case SNDRV_RAWMIDI_IOCTL_DRAIN:
795 {
796 int val;
797 if (get_user(val, (int __user *) argp))
798 return -EFAULT;
799 switch (val) {
800 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801 if (rfile->output == NULL)
802 return -EINVAL;
803 return snd_rawmidi_drain_output(rfile->output);
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 return snd_rawmidi_drain_input(rfile->input);
808 default:
809 return -EINVAL;
810 }
811 }
812 #ifdef CONFIG_SND_DEBUG
813 default:
814 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
815 #endif
816 }
817 return -ENOTTY;
818 }
819
820 static int snd_rawmidi_control_ioctl(struct snd_card *card,
821 struct snd_ctl_file *control,
822 unsigned int cmd,
823 unsigned long arg)
824 {
825 void __user *argp = (void __user *)arg;
826
827 switch (cmd) {
828 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
829 {
830 int device;
831
832 if (get_user(device, (int __user *)argp))
833 return -EFAULT;
834 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
835 device = SNDRV_RAWMIDI_DEVICES - 1;
836 mutex_lock(&register_mutex);
837 device = device < 0 ? 0 : device + 1;
838 while (device < SNDRV_RAWMIDI_DEVICES) {
839 if (snd_rawmidi_search(card, device))
840 break;
841 device++;
842 }
843 if (device == SNDRV_RAWMIDI_DEVICES)
844 device = -1;
845 mutex_unlock(&register_mutex);
846 if (put_user(device, (int __user *)argp))
847 return -EFAULT;
848 return 0;
849 }
850 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
851 {
852 int val;
853
854 if (get_user(val, (int __user *)argp))
855 return -EFAULT;
856 control->prefer_rawmidi_subdevice = val;
857 return 0;
858 }
859 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
860 return snd_rawmidi_info_select_user(card, argp);
861 }
862 return -ENOIOCTLCMD;
863 }
864
865 /**
866 * snd_rawmidi_receive - receive the input data from the device
867 * @substream: the rawmidi substream
868 * @buffer: the buffer pointer
869 * @count: the data size to read
870 *
871 * Reads the data from the internal buffer.
872 *
873 * Returns the size of read data, or a negative error code on failure.
874 */
875 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
876 const unsigned char *buffer, int count)
877 {
878 unsigned long flags;
879 int result = 0, count1;
880 struct snd_rawmidi_runtime *runtime = substream->runtime;
881
882 if (!substream->opened)
883 return -EBADFD;
884 if (runtime->buffer == NULL) {
885 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
886 return -EINVAL;
887 }
888 spin_lock_irqsave(&runtime->lock, flags);
889 if (count == 1) { /* special case, faster code */
890 substream->bytes++;
891 if (runtime->avail < runtime->buffer_size) {
892 runtime->buffer[runtime->hw_ptr++] = buffer[0];
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail++;
895 result++;
896 } else {
897 runtime->xruns++;
898 }
899 } else {
900 substream->bytes += count;
901 count1 = runtime->buffer_size - runtime->hw_ptr;
902 if (count1 > count)
903 count1 = count;
904 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905 count1 = runtime->buffer_size - runtime->avail;
906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907 runtime->hw_ptr += count1;
908 runtime->hw_ptr %= runtime->buffer_size;
909 runtime->avail += count1;
910 count -= count1;
911 result += count1;
912 if (count > 0) {
913 buffer += count1;
914 count1 = count;
915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916 count1 = runtime->buffer_size - runtime->avail;
917 runtime->xruns += count - count1;
918 }
919 if (count1 > 0) {
920 memcpy(runtime->buffer, buffer, count1);
921 runtime->hw_ptr = count1;
922 runtime->avail += count1;
923 result += count1;
924 }
925 }
926 }
927 if (result > 0) {
928 if (runtime->event)
929 tasklet_schedule(&runtime->tasklet);
930 else if (snd_rawmidi_ready(substream))
931 wake_up(&runtime->sleep);
932 }
933 spin_unlock_irqrestore(&runtime->lock, flags);
934 return result;
935 }
936
937 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
938 unsigned char __user *userbuf,
939 unsigned char *kernelbuf, long count)
940 {
941 unsigned long flags;
942 long result = 0, count1;
943 struct snd_rawmidi_runtime *runtime = substream->runtime;
944
945 while (count > 0 && runtime->avail) {
946 count1 = runtime->buffer_size - runtime->appl_ptr;
947 if (count1 > count)
948 count1 = count;
949 spin_lock_irqsave(&runtime->lock, flags);
950 if (count1 > (int)runtime->avail)
951 count1 = runtime->avail;
952 if (kernelbuf)
953 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
954 if (userbuf) {
955 spin_unlock_irqrestore(&runtime->lock, flags);
956 if (copy_to_user(userbuf + result,
957 runtime->buffer + runtime->appl_ptr, count1)) {
958 return result > 0 ? result : -EFAULT;
959 }
960 spin_lock_irqsave(&runtime->lock, flags);
961 }
962 runtime->appl_ptr += count1;
963 runtime->appl_ptr %= runtime->buffer_size;
964 runtime->avail -= count1;
965 spin_unlock_irqrestore(&runtime->lock, flags);
966 result += count1;
967 count -= count1;
968 }
969 return result;
970 }
971
972 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
973 unsigned char *buf, long count)
974 {
975 snd_rawmidi_input_trigger(substream, 1);
976 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
977 }
978
979 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
980 loff_t *offset)
981 {
982 long result;
983 int count1;
984 struct snd_rawmidi_file *rfile;
985 struct snd_rawmidi_substream *substream;
986 struct snd_rawmidi_runtime *runtime;
987
988 rfile = file->private_data;
989 substream = rfile->input;
990 if (substream == NULL)
991 return -EIO;
992 runtime = substream->runtime;
993 snd_rawmidi_input_trigger(substream, 1);
994 result = 0;
995 while (count > 0) {
996 spin_lock_irq(&runtime->lock);
997 while (!snd_rawmidi_ready(substream)) {
998 wait_queue_t wait;
999 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1000 spin_unlock_irq(&runtime->lock);
1001 return result > 0 ? result : -EAGAIN;
1002 }
1003 init_waitqueue_entry(&wait, current);
1004 add_wait_queue(&runtime->sleep, &wait);
1005 set_current_state(TASK_INTERRUPTIBLE);
1006 spin_unlock_irq(&runtime->lock);
1007 schedule();
1008 remove_wait_queue(&runtime->sleep, &wait);
1009 if (signal_pending(current))
1010 return result > 0 ? result : -ERESTARTSYS;
1011 if (!runtime->avail)
1012 return result > 0 ? result : -EIO;
1013 spin_lock_irq(&runtime->lock);
1014 }
1015 spin_unlock_irq(&runtime->lock);
1016 count1 = snd_rawmidi_kernel_read1(substream,
1017 (unsigned char __user *)buf,
1018 NULL/*kernelbuf*/,
1019 count);
1020 if (count1 < 0)
1021 return result > 0 ? result : count1;
1022 result += count1;
1023 buf += count1;
1024 count -= count1;
1025 }
1026 return result;
1027 }
1028
1029 /**
1030 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1031 * @substream: the rawmidi substream
1032 *
1033 * Returns 1 if the internal output buffer is empty, 0 if not.
1034 */
1035 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1036 {
1037 struct snd_rawmidi_runtime *runtime = substream->runtime;
1038 int result;
1039 unsigned long flags;
1040
1041 if (runtime->buffer == NULL) {
1042 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1043 return 1;
1044 }
1045 spin_lock_irqsave(&runtime->lock, flags);
1046 result = runtime->avail >= runtime->buffer_size;
1047 spin_unlock_irqrestore(&runtime->lock, flags);
1048 return result;
1049 }
1050
1051 /**
1052 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1053 * @substream: the rawmidi substream
1054 * @buffer: the buffer pointer
1055 * @count: data size to transfer
1056 *
1057 * Copies data from the internal output buffer to the given buffer.
1058 *
1059 * Call this in the interrupt handler when the midi output is ready,
1060 * and call snd_rawmidi_transmit_ack() after the transmission is
1061 * finished.
1062 *
1063 * Returns the size of copied data, or a negative error code on failure.
1064 */
1065 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1066 unsigned char *buffer, int count)
1067 {
1068 unsigned long flags;
1069 int result, count1;
1070 struct snd_rawmidi_runtime *runtime = substream->runtime;
1071
1072 if (runtime->buffer == NULL) {
1073 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1074 return -EINVAL;
1075 }
1076 result = 0;
1077 spin_lock_irqsave(&runtime->lock, flags);
1078 if (runtime->avail >= runtime->buffer_size) {
1079 /* warning: lowlevel layer MUST trigger down the hardware */
1080 goto __skip;
1081 }
1082 if (count == 1) { /* special case, faster code */
1083 *buffer = runtime->buffer[runtime->hw_ptr];
1084 result++;
1085 } else {
1086 count1 = runtime->buffer_size - runtime->hw_ptr;
1087 if (count1 > count)
1088 count1 = count;
1089 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1090 count1 = runtime->buffer_size - runtime->avail;
1091 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1092 count -= count1;
1093 result += count1;
1094 if (count > 0) {
1095 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1096 count = runtime->buffer_size - runtime->avail - count1;
1097 memcpy(buffer + count1, runtime->buffer, count);
1098 result += count;
1099 }
1100 }
1101 __skip:
1102 spin_unlock_irqrestore(&runtime->lock, flags);
1103 return result;
1104 }
1105
1106 /**
1107 * snd_rawmidi_transmit_ack - acknowledge the transmission
1108 * @substream: the rawmidi substream
1109 * @count: the tranferred count
1110 *
1111 * Advances the hardware pointer for the internal output buffer with
1112 * the given size and updates the condition.
1113 * Call after the transmission is finished.
1114 *
1115 * Returns the advanced size if successful, or a negative error code on failure.
1116 */
1117 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1118 {
1119 unsigned long flags;
1120 struct snd_rawmidi_runtime *runtime = substream->runtime;
1121
1122 if (runtime->buffer == NULL) {
1123 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1124 return -EINVAL;
1125 }
1126 spin_lock_irqsave(&runtime->lock, flags);
1127 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1128 runtime->hw_ptr += count;
1129 runtime->hw_ptr %= runtime->buffer_size;
1130 runtime->avail += count;
1131 substream->bytes += count;
1132 if (count > 0) {
1133 if (runtime->drain || snd_rawmidi_ready(substream))
1134 wake_up(&runtime->sleep);
1135 }
1136 spin_unlock_irqrestore(&runtime->lock, flags);
1137 return count;
1138 }
1139
1140 /**
1141 * snd_rawmidi_transmit - copy from the buffer to the device
1142 * @substream: the rawmidi substream
1143 * @buffer: the buffer pointer
1144 * @count: the data size to transfer
1145 *
1146 * Copies data from the buffer to the device and advances the pointer.
1147 *
1148 * Returns the copied size if successful, or a negative error code on failure.
1149 */
1150 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1151 unsigned char *buffer, int count)
1152 {
1153 if (!substream->opened)
1154 return -EBADFD;
1155 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1156 if (count < 0)
1157 return count;
1158 return snd_rawmidi_transmit_ack(substream, count);
1159 }
1160
1161 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1162 const unsigned char __user *userbuf,
1163 const unsigned char *kernelbuf,
1164 long count)
1165 {
1166 unsigned long flags;
1167 long count1, result;
1168 struct snd_rawmidi_runtime *runtime = substream->runtime;
1169
1170 if (snd_BUG_ON(!kernelbuf && !userbuf))
1171 return -EINVAL;
1172 if (snd_BUG_ON(!runtime->buffer))
1173 return -EINVAL;
1174
1175 result = 0;
1176 spin_lock_irqsave(&runtime->lock, flags);
1177 if (substream->append) {
1178 if ((long)runtime->avail < count) {
1179 spin_unlock_irqrestore(&runtime->lock, flags);
1180 return -EAGAIN;
1181 }
1182 }
1183 while (count > 0 && runtime->avail > 0) {
1184 count1 = runtime->buffer_size - runtime->appl_ptr;
1185 if (count1 > count)
1186 count1 = count;
1187 if (count1 > (long)runtime->avail)
1188 count1 = runtime->avail;
1189 if (kernelbuf)
1190 memcpy(runtime->buffer + runtime->appl_ptr,
1191 kernelbuf + result, count1);
1192 else if (userbuf) {
1193 spin_unlock_irqrestore(&runtime->lock, flags);
1194 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1195 userbuf + result, count1)) {
1196 spin_lock_irqsave(&runtime->lock, flags);
1197 result = result > 0 ? result : -EFAULT;
1198 goto __end;
1199 }
1200 spin_lock_irqsave(&runtime->lock, flags);
1201 }
1202 runtime->appl_ptr += count1;
1203 runtime->appl_ptr %= runtime->buffer_size;
1204 runtime->avail -= count1;
1205 result += count1;
1206 count -= count1;
1207 }
1208 __end:
1209 count1 = runtime->avail < runtime->buffer_size;
1210 spin_unlock_irqrestore(&runtime->lock, flags);
1211 if (count1)
1212 snd_rawmidi_output_trigger(substream, 1);
1213 return result;
1214 }
1215
1216 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1217 const unsigned char *buf, long count)
1218 {
1219 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1220 }
1221
1222 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1223 size_t count, loff_t *offset)
1224 {
1225 long result, timeout;
1226 int count1;
1227 struct snd_rawmidi_file *rfile;
1228 struct snd_rawmidi_runtime *runtime;
1229 struct snd_rawmidi_substream *substream;
1230
1231 rfile = file->private_data;
1232 substream = rfile->output;
1233 runtime = substream->runtime;
1234 /* we cannot put an atomic message to our buffer */
1235 if (substream->append && count > runtime->buffer_size)
1236 return -EIO;
1237 result = 0;
1238 while (count > 0) {
1239 spin_lock_irq(&runtime->lock);
1240 while (!snd_rawmidi_ready_append(substream, count)) {
1241 wait_queue_t wait;
1242 if (file->f_flags & O_NONBLOCK) {
1243 spin_unlock_irq(&runtime->lock);
1244 return result > 0 ? result : -EAGAIN;
1245 }
1246 init_waitqueue_entry(&wait, current);
1247 add_wait_queue(&runtime->sleep, &wait);
1248 set_current_state(TASK_INTERRUPTIBLE);
1249 spin_unlock_irq(&runtime->lock);
1250 timeout = schedule_timeout(30 * HZ);
1251 remove_wait_queue(&runtime->sleep, &wait);
1252 if (signal_pending(current))
1253 return result > 0 ? result : -ERESTARTSYS;
1254 if (!runtime->avail && !timeout)
1255 return result > 0 ? result : -EIO;
1256 spin_lock_irq(&runtime->lock);
1257 }
1258 spin_unlock_irq(&runtime->lock);
1259 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1260 if (count1 < 0)
1261 return result > 0 ? result : count1;
1262 result += count1;
1263 buf += count1;
1264 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1265 break;
1266 count -= count1;
1267 }
1268 if (file->f_flags & O_DSYNC) {
1269 spin_lock_irq(&runtime->lock);
1270 while (runtime->avail != runtime->buffer_size) {
1271 wait_queue_t wait;
1272 unsigned int last_avail = runtime->avail;
1273 init_waitqueue_entry(&wait, current);
1274 add_wait_queue(&runtime->sleep, &wait);
1275 set_current_state(TASK_INTERRUPTIBLE);
1276 spin_unlock_irq(&runtime->lock);
1277 timeout = schedule_timeout(30 * HZ);
1278 remove_wait_queue(&runtime->sleep, &wait);
1279 if (signal_pending(current))
1280 return result > 0 ? result : -ERESTARTSYS;
1281 if (runtime->avail == last_avail && !timeout)
1282 return result > 0 ? result : -EIO;
1283 spin_lock_irq(&runtime->lock);
1284 }
1285 spin_unlock_irq(&runtime->lock);
1286 }
1287 return result;
1288 }
1289
1290 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1291 {
1292 struct snd_rawmidi_file *rfile;
1293 struct snd_rawmidi_runtime *runtime;
1294 unsigned int mask;
1295
1296 rfile = file->private_data;
1297 if (rfile->input != NULL) {
1298 runtime = rfile->input->runtime;
1299 snd_rawmidi_input_trigger(rfile->input, 1);
1300 poll_wait(file, &runtime->sleep, wait);
1301 }
1302 if (rfile->output != NULL) {
1303 runtime = rfile->output->runtime;
1304 poll_wait(file, &runtime->sleep, wait);
1305 }
1306 mask = 0;
1307 if (rfile->input != NULL) {
1308 if (snd_rawmidi_ready(rfile->input))
1309 mask |= POLLIN | POLLRDNORM;
1310 }
1311 if (rfile->output != NULL) {
1312 if (snd_rawmidi_ready(rfile->output))
1313 mask |= POLLOUT | POLLWRNORM;
1314 }
1315 return mask;
1316 }
1317
1318 /*
1319 */
1320 #ifdef CONFIG_COMPAT
1321 #include "rawmidi_compat.c"
1322 #else
1323 #define snd_rawmidi_ioctl_compat NULL
1324 #endif
1325
1326 /*
1327
1328 */
1329
1330 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1331 struct snd_info_buffer *buffer)
1332 {
1333 struct snd_rawmidi *rmidi;
1334 struct snd_rawmidi_substream *substream;
1335 struct snd_rawmidi_runtime *runtime;
1336
1337 rmidi = entry->private_data;
1338 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1339 mutex_lock(&rmidi->open_mutex);
1340 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1341 list_for_each_entry(substream,
1342 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1343 list) {
1344 snd_iprintf(buffer,
1345 "Output %d\n"
1346 " Tx bytes : %lu\n",
1347 substream->number,
1348 (unsigned long) substream->bytes);
1349 if (substream->opened) {
1350 snd_iprintf(buffer,
1351 " Owner PID : %d\n",
1352 pid_vnr(substream->pid));
1353 runtime = substream->runtime;
1354 snd_iprintf(buffer,
1355 " Mode : %s\n"
1356 " Buffer size : %lu\n"
1357 " Avail : %lu\n",
1358 runtime->oss ? "OSS compatible" : "native",
1359 (unsigned long) runtime->buffer_size,
1360 (unsigned long) runtime->avail);
1361 }
1362 }
1363 }
1364 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1365 list_for_each_entry(substream,
1366 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1367 list) {
1368 snd_iprintf(buffer,
1369 "Input %d\n"
1370 " Rx bytes : %lu\n",
1371 substream->number,
1372 (unsigned long) substream->bytes);
1373 if (substream->opened) {
1374 snd_iprintf(buffer,
1375 " Owner PID : %d\n",
1376 pid_vnr(substream->pid));
1377 runtime = substream->runtime;
1378 snd_iprintf(buffer,
1379 " Buffer size : %lu\n"
1380 " Avail : %lu\n"
1381 " Overruns : %lu\n",
1382 (unsigned long) runtime->buffer_size,
1383 (unsigned long) runtime->avail,
1384 (unsigned long) runtime->xruns);
1385 }
1386 }
1387 }
1388 mutex_unlock(&rmidi->open_mutex);
1389 }
1390
1391 /*
1392 * Register functions
1393 */
1394
1395 static const struct file_operations snd_rawmidi_f_ops =
1396 {
1397 .owner = THIS_MODULE,
1398 .read = snd_rawmidi_read,
1399 .write = snd_rawmidi_write,
1400 .open = snd_rawmidi_open,
1401 .release = snd_rawmidi_release,
1402 .llseek = no_llseek,
1403 .poll = snd_rawmidi_poll,
1404 .unlocked_ioctl = snd_rawmidi_ioctl,
1405 .compat_ioctl = snd_rawmidi_ioctl_compat,
1406 };
1407
1408 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1409 struct snd_rawmidi_str *stream,
1410 int direction,
1411 int count)
1412 {
1413 struct snd_rawmidi_substream *substream;
1414 int idx;
1415
1416 for (idx = 0; idx < count; idx++) {
1417 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1418 if (substream == NULL) {
1419 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1420 return -ENOMEM;
1421 }
1422 substream->stream = direction;
1423 substream->number = idx;
1424 substream->rmidi = rmidi;
1425 substream->pstr = stream;
1426 list_add_tail(&substream->list, &stream->substreams);
1427 stream->substream_count++;
1428 }
1429 return 0;
1430 }
1431
1432 /**
1433 * snd_rawmidi_new - create a rawmidi instance
1434 * @card: the card instance
1435 * @id: the id string
1436 * @device: the device index
1437 * @output_count: the number of output streams
1438 * @input_count: the number of input streams
1439 * @rrawmidi: the pointer to store the new rawmidi instance
1440 *
1441 * Creates a new rawmidi instance.
1442 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1443 *
1444 * Returns zero if successful, or a negative error code on failure.
1445 */
1446 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1447 int output_count, int input_count,
1448 struct snd_rawmidi ** rrawmidi)
1449 {
1450 struct snd_rawmidi *rmidi;
1451 int err;
1452 static struct snd_device_ops ops = {
1453 .dev_free = snd_rawmidi_dev_free,
1454 .dev_register = snd_rawmidi_dev_register,
1455 .dev_disconnect = snd_rawmidi_dev_disconnect,
1456 };
1457
1458 if (snd_BUG_ON(!card))
1459 return -ENXIO;
1460 if (rrawmidi)
1461 *rrawmidi = NULL;
1462 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1463 if (rmidi == NULL) {
1464 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1465 return -ENOMEM;
1466 }
1467 rmidi->card = card;
1468 rmidi->device = device;
1469 mutex_init(&rmidi->open_mutex);
1470 init_waitqueue_head(&rmidi->open_wait);
1471 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1472 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1473
1474 if (id != NULL)
1475 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1476 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1477 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1478 SNDRV_RAWMIDI_STREAM_INPUT,
1479 input_count)) < 0) {
1480 snd_rawmidi_free(rmidi);
1481 return err;
1482 }
1483 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1484 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1485 SNDRV_RAWMIDI_STREAM_OUTPUT,
1486 output_count)) < 0) {
1487 snd_rawmidi_free(rmidi);
1488 return err;
1489 }
1490 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1491 snd_rawmidi_free(rmidi);
1492 return err;
1493 }
1494 if (rrawmidi)
1495 *rrawmidi = rmidi;
1496 return 0;
1497 }
1498
1499 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1500 {
1501 struct snd_rawmidi_substream *substream;
1502
1503 while (!list_empty(&stream->substreams)) {
1504 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1505 list_del(&substream->list);
1506 kfree(substream);
1507 }
1508 }
1509
1510 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1511 {
1512 if (!rmidi)
1513 return 0;
1514
1515 snd_info_free_entry(rmidi->proc_entry);
1516 rmidi->proc_entry = NULL;
1517 mutex_lock(&register_mutex);
1518 if (rmidi->ops && rmidi->ops->dev_unregister)
1519 rmidi->ops->dev_unregister(rmidi);
1520 mutex_unlock(&register_mutex);
1521
1522 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1523 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1524 if (rmidi->private_free)
1525 rmidi->private_free(rmidi);
1526 kfree(rmidi);
1527 return 0;
1528 }
1529
1530 static int snd_rawmidi_dev_free(struct snd_device *device)
1531 {
1532 struct snd_rawmidi *rmidi = device->device_data;
1533 return snd_rawmidi_free(rmidi);
1534 }
1535
1536 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1537 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1538 {
1539 struct snd_rawmidi *rmidi = device->private_data;
1540 rmidi->seq_dev = NULL;
1541 }
1542 #endif
1543
1544 static int snd_rawmidi_dev_register(struct snd_device *device)
1545 {
1546 int err;
1547 struct snd_info_entry *entry;
1548 char name[16];
1549 struct snd_rawmidi *rmidi = device->device_data;
1550
1551 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1552 return -ENOMEM;
1553 mutex_lock(&register_mutex);
1554 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1555 mutex_unlock(&register_mutex);
1556 return -EBUSY;
1557 }
1558 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1559 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1560 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1561 rmidi->card, rmidi->device,
1562 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1563 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1564 list_del(&rmidi->list);
1565 mutex_unlock(&register_mutex);
1566 return err;
1567 }
1568 if (rmidi->ops && rmidi->ops->dev_register &&
1569 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1570 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1571 list_del(&rmidi->list);
1572 mutex_unlock(&register_mutex);
1573 return err;
1574 }
1575 #ifdef CONFIG_SND_OSSEMUL
1576 rmidi->ossreg = 0;
1577 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1578 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1579 rmidi->card, 0, &snd_rawmidi_f_ops,
1580 rmidi, name) < 0) {
1581 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1582 } else {
1583 rmidi->ossreg++;
1584 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1585 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1586 #endif
1587 }
1588 }
1589 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1590 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1591 rmidi->card, 1, &snd_rawmidi_f_ops,
1592 rmidi, name) < 0) {
1593 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1594 } else {
1595 rmidi->ossreg++;
1596 }
1597 }
1598 #endif /* CONFIG_SND_OSSEMUL */
1599 mutex_unlock(&register_mutex);
1600 sprintf(name, "midi%d", rmidi->device);
1601 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1602 if (entry) {
1603 entry->private_data = rmidi;
1604 entry->c.text.read = snd_rawmidi_proc_info_read;
1605 if (snd_info_register(entry) < 0) {
1606 snd_info_free_entry(entry);
1607 entry = NULL;
1608 }
1609 }
1610 rmidi->proc_entry = entry;
1611 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1612 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1613 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1614 rmidi->seq_dev->private_data = rmidi;
1615 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1616 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1617 snd_device_register(rmidi->card, rmidi->seq_dev);
1618 }
1619 }
1620 #endif
1621 return 0;
1622 }
1623
1624 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1625 {
1626 struct snd_rawmidi *rmidi = device->device_data;
1627
1628 mutex_lock(&register_mutex);
1629 list_del_init(&rmidi->list);
1630 #ifdef CONFIG_SND_OSSEMUL
1631 if (rmidi->ossreg) {
1632 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1633 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1634 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1635 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1636 #endif
1637 }
1638 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1639 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1640 rmidi->ossreg = 0;
1641 }
1642 #endif /* CONFIG_SND_OSSEMUL */
1643 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1644 mutex_unlock(&register_mutex);
1645 return 0;
1646 }
1647
1648 /**
1649 * snd_rawmidi_set_ops - set the rawmidi operators
1650 * @rmidi: the rawmidi instance
1651 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1652 * @ops: the operator table
1653 *
1654 * Sets the rawmidi operators for the given stream direction.
1655 */
1656 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1657 struct snd_rawmidi_ops *ops)
1658 {
1659 struct snd_rawmidi_substream *substream;
1660
1661 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1662 substream->ops = ops;
1663 }
1664
1665 /*
1666 * ENTRY functions
1667 */
1668
1669 static int __init alsa_rawmidi_init(void)
1670 {
1671
1672 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1673 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1674 #ifdef CONFIG_SND_OSSEMUL
1675 { int i;
1676 /* check device map table */
1677 for (i = 0; i < SNDRV_CARDS; i++) {
1678 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1679 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1680 midi_map[i] = 0;
1681 }
1682 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1683 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1684 amidi_map[i] = 1;
1685 }
1686 }
1687 }
1688 #endif /* CONFIG_SND_OSSEMUL */
1689 return 0;
1690 }
1691
1692 static void __exit alsa_rawmidi_exit(void)
1693 {
1694 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1695 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1696 }
1697
1698 module_init(alsa_rawmidi_init)
1699 module_exit(alsa_rawmidi_exit)
1700
1701 EXPORT_SYMBOL(snd_rawmidi_output_params);
1702 EXPORT_SYMBOL(snd_rawmidi_input_params);
1703 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1704 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1705 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1706 EXPORT_SYMBOL(snd_rawmidi_receive);
1707 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1708 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1709 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1710 EXPORT_SYMBOL(snd_rawmidi_transmit);
1711 EXPORT_SYMBOL(snd_rawmidi_new);
1712 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1713 EXPORT_SYMBOL(snd_rawmidi_info_select);
1714 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1715 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1716 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1717 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
Linux with added FPC-III support