?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[NET] sem2mutex: net/
[linux-2.6/kvm.git] / sound / core / rawmidi.c
blobd4d124e21924835ee6f10b3cc34afec7d8a6632c
1 /*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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/driver.h>
23 #include <sound/core.h>
24 #include <linux/major.h>
25 #include <linux/init.h>
26 #include <linux/smp_lock.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/time.h>
30 #include <linux/wait.h>
31 #include <linux/moduleparam.h>
32 #include <linux/delay.h>
33 #include <linux/wait.h>
34 #include <sound/rawmidi.h>
35 #include <sound/info.h>
36 #include <sound/control.h>
37 #include <sound/minors.h>
38 #include <sound/initval.h>
39
40 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
42 MODULE_LICENSE("GPL");
43
44 #ifdef CONFIG_SND_OSSEMUL
45 static int midi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 0};
46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
47 module_param_array(midi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
49 module_param_array(amidi_map, int, NULL, 0444);
50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
51 #endif /* CONFIG_SND_OSSEMUL */
52
53 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
54 static int snd_rawmidi_dev_free(struct snd_device *device);
55 static int snd_rawmidi_dev_register(struct snd_device *device);
56 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
57 static int snd_rawmidi_dev_unregister(struct snd_device *device);
58
59 static LIST_HEAD(snd_rawmidi_devices);
60 static DECLARE_MUTEX(register_mutex);
61
62 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
63 {
64 struct list_head *p;
65 struct snd_rawmidi *rawmidi;
66
67 list_for_each(p, &snd_rawmidi_devices) {
68 rawmidi = list_entry(p, struct snd_rawmidi, list);
69 if (rawmidi->card == card && rawmidi->device == device)
70 return rawmidi;
71 }
72 return NULL;
73 }
74
75 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
76 {
77 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
78 case FMODE_WRITE:
79 return SNDRV_RAWMIDI_LFLG_OUTPUT;
80 case FMODE_READ:
81 return SNDRV_RAWMIDI_LFLG_INPUT;
82 default:
83 return SNDRV_RAWMIDI_LFLG_OPEN;
84 }
85 }
86
87 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
88 {
89 struct snd_rawmidi_runtime *runtime = substream->runtime;
90 return runtime->avail >= runtime->avail_min;
91 }
92
93 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
94 size_t count)
95 {
96 struct snd_rawmidi_runtime *runtime = substream->runtime;
97 return runtime->avail >= runtime->avail_min &&
98 (!substream->append || runtime->avail >= count);
99 }
100
101 static void snd_rawmidi_input_event_tasklet(unsigned long data)
102 {
103 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
104 substream->runtime->event(substream);
105 }
106
107 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
108 {
109 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
110 substream->ops->trigger(substream, 1);
111 }
112
113 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
114 {
115 struct snd_rawmidi_runtime *runtime;
116
117 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
118 return -ENOMEM;
119 spin_lock_init(&runtime->lock);
120 init_waitqueue_head(&runtime->sleep);
121 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
122 tasklet_init(&runtime->tasklet,
123 snd_rawmidi_input_event_tasklet,
124 (unsigned long)substream);
125 else
126 tasklet_init(&runtime->tasklet,
127 snd_rawmidi_output_trigger_tasklet,
128 (unsigned long)substream);
129 runtime->event = NULL;
130 runtime->buffer_size = PAGE_SIZE;
131 runtime->avail_min = 1;
132 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
133 runtime->avail = 0;
134 else
135 runtime->avail = runtime->buffer_size;
136 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
137 kfree(runtime);
138 return -ENOMEM;
139 }
140 runtime->appl_ptr = runtime->hw_ptr = 0;
141 substream->runtime = runtime;
142 return 0;
143 }
144
145 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
146 {
147 struct snd_rawmidi_runtime *runtime = substream->runtime;
148
149 kfree(runtime->buffer);
150 kfree(runtime);
151 substream->runtime = NULL;
152 return 0;
153 }
154
155 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
156 {
157 if (up) {
158 tasklet_hi_schedule(&substream->runtime->tasklet);
159 } else {
160 tasklet_kill(&substream->runtime->tasklet);
161 substream->ops->trigger(substream, 0);
162 }
163 }
164
165 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
166 {
167 substream->ops->trigger(substream, up);
168 if (!up && substream->runtime->event)
169 tasklet_kill(&substream->runtime->tasklet);
170 }
171
172 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
173 {
174 unsigned long flags;
175 struct snd_rawmidi_runtime *runtime = substream->runtime;
176
177 snd_rawmidi_output_trigger(substream, 0);
178 runtime->drain = 0;
179 spin_lock_irqsave(&runtime->lock, flags);
180 runtime->appl_ptr = runtime->hw_ptr = 0;
181 runtime->avail = runtime->buffer_size;
182 spin_unlock_irqrestore(&runtime->lock, flags);
183 return 0;
184 }
185
186 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
187 {
188 int err;
189 long timeout;
190 struct snd_rawmidi_runtime *runtime = substream->runtime;
191
192 err = 0;
193 runtime->drain = 1;
194 timeout = wait_event_interruptible_timeout(runtime->sleep,
195 (runtime->avail >= runtime->buffer_size),
196 10*HZ);
197 if (signal_pending(current))
198 err = -ERESTARTSYS;
199 if (runtime->avail < runtime->buffer_size && !timeout) {
200 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
201 err = -EIO;
202 }
203 runtime->drain = 0;
204 if (err != -ERESTARTSYS) {
205 /* we need wait a while to make sure that Tx FIFOs are empty */
206 if (substream->ops->drain)
207 substream->ops->drain(substream);
208 else
209 msleep(50);
210 snd_rawmidi_drop_output(substream);
211 }
212 return err;
213 }
214
215 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
216 {
217 unsigned long flags;
218 struct snd_rawmidi_runtime *runtime = substream->runtime;
219
220 snd_rawmidi_input_trigger(substream, 0);
221 runtime->drain = 0;
222 spin_lock_irqsave(&runtime->lock, flags);
223 runtime->appl_ptr = runtime->hw_ptr = 0;
224 runtime->avail = 0;
225 spin_unlock_irqrestore(&runtime->lock, flags);
226 return 0;
227 }
228
229 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
230 int mode, struct snd_rawmidi_file * rfile)
231 {
232 struct snd_rawmidi *rmidi;
233 struct list_head *list1, *list2;
234 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
235 struct snd_rawmidi_runtime *input = NULL, *output = NULL;
236 int err;
237
238 if (rfile)
239 rfile->input = rfile->output = NULL;
240 down(&register_mutex);
241 rmidi = snd_rawmidi_search(card, device);
242 up(&register_mutex);
243 if (rmidi == NULL) {
244 err = -ENODEV;
245 goto __error1;
246 }
247 if (!try_module_get(rmidi->card->module)) {
248 err = -EFAULT;
249 goto __error1;
250 }
251 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
252 down(&rmidi->open_mutex);
253 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
254 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
255 err = -ENXIO;
256 goto __error;
257 }
258 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
259 err = -ENODEV;
260 goto __error;
261 }
262 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
263 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
264 err = -EAGAIN;
265 goto __error;
266 }
267 }
268 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
269 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
270 err = -ENXIO;
271 goto __error;
272 }
273 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
274 err = -ENODEV;
275 goto __error;
276 }
277 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
278 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
279 err = -EAGAIN;
280 goto __error;
281 }
282 }
283 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
284 while (1) {
285 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
286 sinput = NULL;
287 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
288 err = -EAGAIN;
289 goto __error;
290 }
291 break;
292 }
293 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
294 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
295 goto __nexti;
296 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
297 break;
298 __nexti:
299 list1 = list1->next;
300 }
301 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
302 while (1) {
303 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
304 soutput = NULL;
305 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
306 err = -EAGAIN;
307 goto __error;
308 }
309 break;
310 }
311 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
312 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
313 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
314 if (soutput->opened && !soutput->append)
315 goto __nexto;
316 } else {
317 if (soutput->opened)
318 goto __nexto;
319 }
320 }
321 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
322 break;
323 __nexto:
324 list2 = list2->next;
325 }
326 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
327 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
328 goto __error;
329 input = sinput->runtime;
330 if ((err = sinput->ops->open(sinput)) < 0)
331 goto __error;
332 sinput->opened = 1;
333 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
334 } else {
335 sinput = NULL;
336 }
337 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
338 if (soutput->opened)
339 goto __skip_output;
340 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
341 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
342 sinput->ops->close(sinput);
343 goto __error;
344 }
345 output = soutput->runtime;
346 if ((err = soutput->ops->open(soutput)) < 0) {
347 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
348 sinput->ops->close(sinput);
349 goto __error;
350 }
351 __skip_output:
352 soutput->opened = 1;
353 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
354 soutput->append = 1;
355 if (soutput->use_count++ == 0)
356 soutput->active_sensing = 1;
357 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
358 } else {
359 soutput = NULL;
360 }
361 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
362 up(&rmidi->open_mutex);
363 if (rfile) {
364 rfile->rmidi = rmidi;
365 rfile->input = sinput;
366 rfile->output = soutput;
367 }
368 return 0;
369
370 __error:
371 if (input != NULL)
372 snd_rawmidi_runtime_free(sinput);
373 if (output != NULL)
374 snd_rawmidi_runtime_free(soutput);
375 module_put(rmidi->card->module);
376 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
377 up(&rmidi->open_mutex);
378 __error1:
379 return err;
380 }
381
382 static int snd_rawmidi_open(struct inode *inode, struct file *file)
383 {
384 int maj = imajor(inode);
385 struct snd_card *card;
386 int subdevice;
387 unsigned short fflags;
388 int err;
389 struct snd_rawmidi *rmidi;
390 struct snd_rawmidi_file *rawmidi_file;
391 wait_queue_t wait;
392 struct list_head *list;
393 struct snd_ctl_file *kctl;
394
395 if (maj == snd_major) {
396 rmidi = snd_lookup_minor_data(iminor(inode),
397 SNDRV_DEVICE_TYPE_RAWMIDI);
398 #ifdef CONFIG_SND_OSSEMUL
399 } else if (maj == SOUND_MAJOR) {
400 rmidi = snd_lookup_oss_minor_data(iminor(inode),
401 SNDRV_OSS_DEVICE_TYPE_MIDI);
402 #endif
403 } else
404 return -ENXIO;
405
406 if (rmidi == NULL)
407 return -ENODEV;
408 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
409 return -EINVAL; /* invalid combination */
410 card = rmidi->card;
411 err = snd_card_file_add(card, file);
412 if (err < 0)
413 return -ENODEV;
414 fflags = snd_rawmidi_file_flags(file);
415 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
416 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
417 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
418 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
419 if (rawmidi_file == NULL) {
420 snd_card_file_remove(card, file);
421 return -ENOMEM;
422 }
423 init_waitqueue_entry(&wait, current);
424 add_wait_queue(&rmidi->open_wait, &wait);
425 down(&rmidi->open_mutex);
426 while (1) {
427 subdevice = -1;
428 down_read(&card->controls_rwsem);
429 list_for_each(list, &card->ctl_files) {
430 kctl = snd_ctl_file(list);
431 if (kctl->pid == current->pid) {
432 subdevice = kctl->prefer_rawmidi_subdevice;
433 break;
434 }
435 }
436 up_read(&card->controls_rwsem);
437 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
438 subdevice, fflags, rawmidi_file);
439 if (err >= 0)
440 break;
441 if (err == -EAGAIN) {
442 if (file->f_flags & O_NONBLOCK) {
443 err = -EBUSY;
444 break;
445 }
446 } else
447 break;
448 set_current_state(TASK_INTERRUPTIBLE);
449 up(&rmidi->open_mutex);
450 schedule();
451 down(&rmidi->open_mutex);
452 if (signal_pending(current)) {
453 err = -ERESTARTSYS;
454 break;
455 }
456 }
457 #ifdef CONFIG_SND_OSSEMUL
458 if (rawmidi_file->input && rawmidi_file->input->runtime)
459 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
460 if (rawmidi_file->output && rawmidi_file->output->runtime)
461 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
462 #endif
463 remove_wait_queue(&rmidi->open_wait, &wait);
464 if (err >= 0) {
465 file->private_data = rawmidi_file;
466 } else {
467 snd_card_file_remove(card, file);
468 kfree(rawmidi_file);
469 }
470 up(&rmidi->open_mutex);
471 return err;
472 }
473
474 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
475 {
476 struct snd_rawmidi *rmidi;
477 struct snd_rawmidi_substream *substream;
478 struct snd_rawmidi_runtime *runtime;
479
480 snd_assert(rfile != NULL, return -ENXIO);
481 snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
482 rmidi = rfile->rmidi;
483 down(&rmidi->open_mutex);
484 if (rfile->input != NULL) {
485 substream = rfile->input;
486 rfile->input = NULL;
487 runtime = substream->runtime;
488 snd_rawmidi_input_trigger(substream, 0);
489 substream->ops->close(substream);
490 if (runtime->private_free != NULL)
491 runtime->private_free(substream);
492 snd_rawmidi_runtime_free(substream);
493 substream->opened = 0;
494 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
495 }
496 if (rfile->output != NULL) {
497 substream = rfile->output;
498 rfile->output = NULL;
499 if (--substream->use_count == 0) {
500 runtime = substream->runtime;
501 if (substream->active_sensing) {
502 unsigned char buf = 0xfe;
503 /* sending single active sensing message to shut the device up */
504 snd_rawmidi_kernel_write(substream, &buf, 1);
505 }
506 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
507 snd_rawmidi_output_trigger(substream, 0);
508 substream->ops->close(substream);
509 if (runtime->private_free != NULL)
510 runtime->private_free(substream);
511 snd_rawmidi_runtime_free(substream);
512 substream->opened = 0;
513 substream->append = 0;
514 }
515 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
516 }
517 up(&rmidi->open_mutex);
518 module_put(rmidi->card->module);
519 return 0;
520 }
521
522 static int snd_rawmidi_release(struct inode *inode, struct file *file)
523 {
524 struct snd_rawmidi_file *rfile;
525 struct snd_rawmidi *rmidi;
526 int err;
527
528 rfile = file->private_data;
529 err = snd_rawmidi_kernel_release(rfile);
530 rmidi = rfile->rmidi;
531 wake_up(&rmidi->open_wait);
532 kfree(rfile);
533 snd_card_file_remove(rmidi->card, file);
534 return err;
535 }
536
537 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
538 struct snd_rawmidi_info *info)
539 {
540 struct snd_rawmidi *rmidi;
541
542 if (substream == NULL)
543 return -ENODEV;
544 rmidi = substream->rmidi;
545 memset(info, 0, sizeof(*info));
546 info->card = rmidi->card->number;
547 info->device = rmidi->device;
548 info->subdevice = substream->number;
549 info->stream = substream->stream;
550 info->flags = rmidi->info_flags;
551 strcpy(info->id, rmidi->id);
552 strcpy(info->name, rmidi->name);
553 strcpy(info->subname, substream->name);
554 info->subdevices_count = substream->pstr->substream_count;
555 info->subdevices_avail = (substream->pstr->substream_count -
556 substream->pstr->substream_opened);
557 return 0;
558 }
559
560 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
561 struct snd_rawmidi_info __user * _info)
562 {
563 struct snd_rawmidi_info info;
564 int err;
565 if ((err = snd_rawmidi_info(substream, &info)) < 0)
566 return err;
567 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
568 return -EFAULT;
569 return 0;
570 }
571
572 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
573 {
574 struct snd_rawmidi *rmidi;
575 struct snd_rawmidi_str *pstr;
576 struct snd_rawmidi_substream *substream;
577 struct list_head *list;
578
579 down(&register_mutex);
580 rmidi = snd_rawmidi_search(card, info->device);
581 up(&register_mutex);
582 if (!rmidi)
583 return -ENXIO;
584 if (info->stream < 0 || info->stream > 1)
585 return -EINVAL;
586 pstr = &rmidi->streams[info->stream];
587 if (pstr->substream_count == 0)
588 return -ENOENT;
589 if (info->subdevice >= pstr->substream_count)
590 return -ENXIO;
591 list_for_each(list, &pstr->substreams) {
592 substream = list_entry(list, struct snd_rawmidi_substream, list);
593 if ((unsigned int)substream->number == info->subdevice)
594 return snd_rawmidi_info(substream, info);
595 }
596 return -ENXIO;
597 }
598
599 static int snd_rawmidi_info_select_user(struct snd_card *card,
600 struct snd_rawmidi_info __user *_info)
601 {
602 int err;
603 struct snd_rawmidi_info info;
604 if (get_user(info.device, &_info->device))
605 return -EFAULT;
606 if (get_user(info.stream, &_info->stream))
607 return -EFAULT;
608 if (get_user(info.subdevice, &_info->subdevice))
609 return -EFAULT;
610 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
611 return err;
612 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
613 return -EFAULT;
614 return 0;
615 }
616
617 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
618 struct snd_rawmidi_params * params)
619 {
620 char *newbuf;
621 struct snd_rawmidi_runtime *runtime = substream->runtime;
622
623 if (substream->append && substream->use_count > 1)
624 return -EBUSY;
625 snd_rawmidi_drain_output(substream);
626 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
627 return -EINVAL;
628 }
629 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
630 return -EINVAL;
631 }
632 if (params->buffer_size != runtime->buffer_size) {
633 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
634 return -ENOMEM;
635 kfree(runtime->buffer);
636 runtime->buffer = newbuf;
637 runtime->buffer_size = params->buffer_size;
638 runtime->avail = runtime->buffer_size;
639 }
640 runtime->avail_min = params->avail_min;
641 substream->active_sensing = !params->no_active_sensing;
642 return 0;
643 }
644
645 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
646 struct snd_rawmidi_params * params)
647 {
648 char *newbuf;
649 struct snd_rawmidi_runtime *runtime = substream->runtime;
650
651 snd_rawmidi_drain_input(substream);
652 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
653 return -EINVAL;
654 }
655 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
656 return -EINVAL;
657 }
658 if (params->buffer_size != runtime->buffer_size) {
659 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
660 return -ENOMEM;
661 kfree(runtime->buffer);
662 runtime->buffer = newbuf;
663 runtime->buffer_size = params->buffer_size;
664 }
665 runtime->avail_min = params->avail_min;
666 return 0;
667 }
668
669 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
670 struct snd_rawmidi_status * status)
671 {
672 struct snd_rawmidi_runtime *runtime = substream->runtime;
673
674 memset(status, 0, sizeof(*status));
675 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
676 spin_lock_irq(&runtime->lock);
677 status->avail = runtime->avail;
678 spin_unlock_irq(&runtime->lock);
679 return 0;
680 }
681
682 static int snd_rawmidi_input_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_INPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 status->xruns = runtime->xruns;
692 runtime->xruns = 0;
693 spin_unlock_irq(&runtime->lock);
694 return 0;
695 }
696
697 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
698 {
699 struct snd_rawmidi_file *rfile;
700 void __user *argp = (void __user *)arg;
701
702 rfile = file->private_data;
703 if (((cmd >> 8) & 0xff) != 'W')
704 return -ENOTTY;
705 switch (cmd) {
706 case SNDRV_RAWMIDI_IOCTL_PVERSION:
707 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
708 case SNDRV_RAWMIDI_IOCTL_INFO:
709 {
710 int stream;
711 struct snd_rawmidi_info __user *info = argp;
712 if (get_user(stream, &info->stream))
713 return -EFAULT;
714 switch (stream) {
715 case SNDRV_RAWMIDI_STREAM_INPUT:
716 return snd_rawmidi_info_user(rfile->input, info);
717 case SNDRV_RAWMIDI_STREAM_OUTPUT:
718 return snd_rawmidi_info_user(rfile->output, info);
719 default:
720 return -EINVAL;
721 }
722 }
723 case SNDRV_RAWMIDI_IOCTL_PARAMS:
724 {
725 struct snd_rawmidi_params params;
726 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
727 return -EFAULT;
728 switch (params.stream) {
729 case SNDRV_RAWMIDI_STREAM_OUTPUT:
730 if (rfile->output == NULL)
731 return -EINVAL;
732 return snd_rawmidi_output_params(rfile->output, &params);
733 case SNDRV_RAWMIDI_STREAM_INPUT:
734 if (rfile->input == NULL)
735 return -EINVAL;
736 return snd_rawmidi_input_params(rfile->input, &params);
737 default:
738 return -EINVAL;
739 }
740 }
741 case SNDRV_RAWMIDI_IOCTL_STATUS:
742 {
743 int err = 0;
744 struct snd_rawmidi_status status;
745 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
746 return -EFAULT;
747 switch (status.stream) {
748 case SNDRV_RAWMIDI_STREAM_OUTPUT:
749 if (rfile->output == NULL)
750 return -EINVAL;
751 err = snd_rawmidi_output_status(rfile->output, &status);
752 break;
753 case SNDRV_RAWMIDI_STREAM_INPUT:
754 if (rfile->input == NULL)
755 return -EINVAL;
756 err = snd_rawmidi_input_status(rfile->input, &status);
757 break;
758 default:
759 return -EINVAL;
760 }
761 if (err < 0)
762 return err;
763 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
764 return -EFAULT;
765 return 0;
766 }
767 case SNDRV_RAWMIDI_IOCTL_DROP:
768 {
769 int val;
770 if (get_user(val, (int __user *) argp))
771 return -EFAULT;
772 switch (val) {
773 case SNDRV_RAWMIDI_STREAM_OUTPUT:
774 if (rfile->output == NULL)
775 return -EINVAL;
776 return snd_rawmidi_drop_output(rfile->output);
777 default:
778 return -EINVAL;
779 }
780 }
781 case SNDRV_RAWMIDI_IOCTL_DRAIN:
782 {
783 int val;
784 if (get_user(val, (int __user *) argp))
785 return -EFAULT;
786 switch (val) {
787 case SNDRV_RAWMIDI_STREAM_OUTPUT:
788 if (rfile->output == NULL)
789 return -EINVAL;
790 return snd_rawmidi_drain_output(rfile->output);
791 case SNDRV_RAWMIDI_STREAM_INPUT:
792 if (rfile->input == NULL)
793 return -EINVAL;
794 return snd_rawmidi_drain_input(rfile->input);
795 default:
796 return -EINVAL;
797 }
798 }
799 #ifdef CONFIG_SND_DEBUG
800 default:
801 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
802 #endif
803 }
804 return -ENOTTY;
805 }
806
807 static int snd_rawmidi_control_ioctl(struct snd_card *card,
808 struct snd_ctl_file *control,
809 unsigned int cmd,
810 unsigned long arg)
811 {
812 void __user *argp = (void __user *)arg;
813
814 switch (cmd) {
815 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
816 {
817 int device;
818
819 if (get_user(device, (int __user *)argp))
820 return -EFAULT;
821 down(&register_mutex);
822 device = device < 0 ? 0 : device + 1;
823 while (device < SNDRV_RAWMIDI_DEVICES) {
824 if (snd_rawmidi_search(card, device))
825 break;
826 device++;
827 }
828 if (device == SNDRV_RAWMIDI_DEVICES)
829 device = -1;
830 up(&register_mutex);
831 if (put_user(device, (int __user *)argp))
832 return -EFAULT;
833 return 0;
834 }
835 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
836 {
837 int val;
838
839 if (get_user(val, (int __user *)argp))
840 return -EFAULT;
841 control->prefer_rawmidi_subdevice = val;
842 return 0;
843 }
844 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
845 return snd_rawmidi_info_select_user(card, argp);
846 }
847 return -ENOIOCTLCMD;
848 }
849
850 /**
851 * snd_rawmidi_receive - receive the input data from the device
852 * @substream: the rawmidi substream
853 * @buffer: the buffer pointer
854 * @count: the data size to read
855 *
856 * Reads the data from the internal buffer.
857 *
858 * Returns the size of read data, or a negative error code on failure.
859 */
860 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
861 const unsigned char *buffer, int count)
862 {
863 unsigned long flags;
864 int result = 0, count1;
865 struct snd_rawmidi_runtime *runtime = substream->runtime;
866
867 if (runtime->buffer == NULL) {
868 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
869 return -EINVAL;
870 }
871 spin_lock_irqsave(&runtime->lock, flags);
872 if (count == 1) { /* special case, faster code */
873 substream->bytes++;
874 if (runtime->avail < runtime->buffer_size) {
875 runtime->buffer[runtime->hw_ptr++] = buffer[0];
876 runtime->hw_ptr %= runtime->buffer_size;
877 runtime->avail++;
878 result++;
879 } else {
880 runtime->xruns++;
881 }
882 } else {
883 substream->bytes += count;
884 count1 = runtime->buffer_size - runtime->hw_ptr;
885 if (count1 > count)
886 count1 = count;
887 if (count1 > (int)(runtime->buffer_size - runtime->avail))
888 count1 = runtime->buffer_size - runtime->avail;
889 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
890 runtime->hw_ptr += count1;
891 runtime->hw_ptr %= runtime->buffer_size;
892 runtime->avail += count1;
893 count -= count1;
894 result += count1;
895 if (count > 0) {
896 buffer += count1;
897 count1 = count;
898 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
899 count1 = runtime->buffer_size - runtime->avail;
900 runtime->xruns += count - count1;
901 }
902 if (count1 > 0) {
903 memcpy(runtime->buffer, buffer, count1);
904 runtime->hw_ptr = count1;
905 runtime->avail += count1;
906 result += count1;
907 }
908 }
909 }
910 if (result > 0) {
911 if (runtime->event)
912 tasklet_hi_schedule(&runtime->tasklet);
913 else if (snd_rawmidi_ready(substream))
914 wake_up(&runtime->sleep);
915 }
916 spin_unlock_irqrestore(&runtime->lock, flags);
917 return result;
918 }
919
920 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
921 unsigned char *buf, long count, int kernel)
922 {
923 unsigned long flags;
924 long result = 0, count1;
925 struct snd_rawmidi_runtime *runtime = substream->runtime;
926
927 while (count > 0 && runtime->avail) {
928 count1 = runtime->buffer_size - runtime->appl_ptr;
929 if (count1 > count)
930 count1 = count;
931 spin_lock_irqsave(&runtime->lock, flags);
932 if (count1 > (int)runtime->avail)
933 count1 = runtime->avail;
934 if (kernel) {
935 memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
936 } else {
937 spin_unlock_irqrestore(&runtime->lock, flags);
938 if (copy_to_user((char __user *)buf + result,
939 runtime->buffer + runtime->appl_ptr, count1)) {
940 return result > 0 ? result : -EFAULT;
941 }
942 spin_lock_irqsave(&runtime->lock, flags);
943 }
944 runtime->appl_ptr += count1;
945 runtime->appl_ptr %= runtime->buffer_size;
946 runtime->avail -= count1;
947 spin_unlock_irqrestore(&runtime->lock, flags);
948 result += count1;
949 count -= count1;
950 }
951 return result;
952 }
953
954 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
955 unsigned char *buf, long count)
956 {
957 snd_rawmidi_input_trigger(substream, 1);
958 return snd_rawmidi_kernel_read1(substream, buf, count, 1);
959 }
960
961 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
962 loff_t *offset)
963 {
964 long result;
965 int count1;
966 struct snd_rawmidi_file *rfile;
967 struct snd_rawmidi_substream *substream;
968 struct snd_rawmidi_runtime *runtime;
969
970 rfile = file->private_data;
971 substream = rfile->input;
972 if (substream == NULL)
973 return -EIO;
974 runtime = substream->runtime;
975 snd_rawmidi_input_trigger(substream, 1);
976 result = 0;
977 while (count > 0) {
978 spin_lock_irq(&runtime->lock);
979 while (!snd_rawmidi_ready(substream)) {
980 wait_queue_t wait;
981 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
982 spin_unlock_irq(&runtime->lock);
983 return result > 0 ? result : -EAGAIN;
984 }
985 init_waitqueue_entry(&wait, current);
986 add_wait_queue(&runtime->sleep, &wait);
987 set_current_state(TASK_INTERRUPTIBLE);
988 spin_unlock_irq(&runtime->lock);
989 schedule();
990 remove_wait_queue(&runtime->sleep, &wait);
991 if (signal_pending(current))
992 return result > 0 ? result : -ERESTARTSYS;
993 if (!runtime->avail)
994 return result > 0 ? result : -EIO;
995 spin_lock_irq(&runtime->lock);
996 }
997 spin_unlock_irq(&runtime->lock);
998 count1 = snd_rawmidi_kernel_read1(substream,
999 (unsigned char __force *)buf,
1000 count, 0);
1001 if (count1 < 0)
1002 return result > 0 ? result : count1;
1003 result += count1;
1004 buf += count1;
1005 count -= count1;
1006 }
1007 return result;
1008 }
1009
1010 /**
1011 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1012 * @substream: the rawmidi substream
1013 *
1014 * Returns 1 if the internal output buffer is empty, 0 if not.
1015 */
1016 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1017 {
1018 struct snd_rawmidi_runtime *runtime = substream->runtime;
1019 int result;
1020 unsigned long flags;
1021
1022 if (runtime->buffer == NULL) {
1023 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1024 return 1;
1025 }
1026 spin_lock_irqsave(&runtime->lock, flags);
1027 result = runtime->avail >= runtime->buffer_size;
1028 spin_unlock_irqrestore(&runtime->lock, flags);
1029 return result;
1030 }
1031
1032 /**
1033 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1034 * @substream: the rawmidi substream
1035 * @buffer: the buffer pointer
1036 * @count: data size to transfer
1037 *
1038 * Copies data from the internal output buffer to the given buffer.
1039 *
1040 * Call this in the interrupt handler when the midi output is ready,
1041 * and call snd_rawmidi_transmit_ack() after the transmission is
1042 * finished.
1043 *
1044 * Returns the size of copied data, or a negative error code on failure.
1045 */
1046 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1047 unsigned char *buffer, int count)
1048 {
1049 unsigned long flags;
1050 int result, count1;
1051 struct snd_rawmidi_runtime *runtime = substream->runtime;
1052
1053 if (runtime->buffer == NULL) {
1054 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1055 return -EINVAL;
1056 }
1057 result = 0;
1058 spin_lock_irqsave(&runtime->lock, flags);
1059 if (runtime->avail >= runtime->buffer_size) {
1060 /* warning: lowlevel layer MUST trigger down the hardware */
1061 goto __skip;
1062 }
1063 if (count == 1) { /* special case, faster code */
1064 *buffer = runtime->buffer[runtime->hw_ptr];
1065 result++;
1066 } else {
1067 count1 = runtime->buffer_size - runtime->hw_ptr;
1068 if (count1 > count)
1069 count1 = count;
1070 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1071 count1 = runtime->buffer_size - runtime->avail;
1072 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1073 count -= count1;
1074 result += count1;
1075 if (count > 0) {
1076 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1077 count = runtime->buffer_size - runtime->avail - count1;
1078 memcpy(buffer + count1, runtime->buffer, count);
1079 result += count;
1080 }
1081 }
1082 __skip:
1083 spin_unlock_irqrestore(&runtime->lock, flags);
1084 return result;
1085 }
1086
1087 /**
1088 * snd_rawmidi_transmit_ack - acknowledge the transmission
1089 * @substream: the rawmidi substream
1090 * @count: the tranferred count
1091 *
1092 * Advances the hardware pointer for the internal output buffer with
1093 * the given size and updates the condition.
1094 * Call after the transmission is finished.
1095 *
1096 * Returns the advanced size if successful, or a negative error code on failure.
1097 */
1098 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1099 {
1100 unsigned long flags;
1101 struct snd_rawmidi_runtime *runtime = substream->runtime;
1102
1103 if (runtime->buffer == NULL) {
1104 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1105 return -EINVAL;
1106 }
1107 spin_lock_irqsave(&runtime->lock, flags);
1108 snd_assert(runtime->avail + count <= runtime->buffer_size, );
1109 runtime->hw_ptr += count;
1110 runtime->hw_ptr %= runtime->buffer_size;
1111 runtime->avail += count;
1112 substream->bytes += count;
1113 if (count > 0) {
1114 if (runtime->drain || snd_rawmidi_ready(substream))
1115 wake_up(&runtime->sleep);
1116 }
1117 spin_unlock_irqrestore(&runtime->lock, flags);
1118 return count;
1119 }
1120
1121 /**
1122 * snd_rawmidi_transmit - copy from the buffer to the device
1123 * @substream: the rawmidi substream
1124 * @buffer: the buffer pointer
1125 * @count: the data size to transfer
1126 *
1127 * Copies data from the buffer to the device and advances the pointer.
1128 *
1129 * Returns the copied size if successful, or a negative error code on failure.
1130 */
1131 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1132 unsigned char *buffer, int count)
1133 {
1134 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1135 if (count < 0)
1136 return count;
1137 return snd_rawmidi_transmit_ack(substream, count);
1138 }
1139
1140 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1141 const unsigned char *buf, long count, int kernel)
1142 {
1143 unsigned long flags;
1144 long count1, result;
1145 struct snd_rawmidi_runtime *runtime = substream->runtime;
1146
1147 snd_assert(buf != NULL, return -EINVAL);
1148 snd_assert(runtime->buffer != NULL, return -EINVAL);
1149
1150 result = 0;
1151 spin_lock_irqsave(&runtime->lock, flags);
1152 if (substream->append) {
1153 if ((long)runtime->avail < count) {
1154 spin_unlock_irqrestore(&runtime->lock, flags);
1155 return -EAGAIN;
1156 }
1157 }
1158 while (count > 0 && runtime->avail > 0) {
1159 count1 = runtime->buffer_size - runtime->appl_ptr;
1160 if (count1 > count)
1161 count1 = count;
1162 if (count1 > (long)runtime->avail)
1163 count1 = runtime->avail;
1164 if (kernel) {
1165 memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1166 } else {
1167 spin_unlock_irqrestore(&runtime->lock, flags);
1168 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1169 (char __user *)buf, count1)) {
1170 spin_lock_irqsave(&runtime->lock, flags);
1171 result = result > 0 ? result : -EFAULT;
1172 goto __end;
1173 }
1174 spin_lock_irqsave(&runtime->lock, flags);
1175 }
1176 runtime->appl_ptr += count1;
1177 runtime->appl_ptr %= runtime->buffer_size;
1178 runtime->avail -= count1;
1179 result += count1;
1180 buf += count1;
1181 count -= count1;
1182 }
1183 __end:
1184 count1 = runtime->avail < runtime->buffer_size;
1185 spin_unlock_irqrestore(&runtime->lock, flags);
1186 if (count1)
1187 snd_rawmidi_output_trigger(substream, 1);
1188 return result;
1189 }
1190
1191 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1192 const unsigned char *buf, long count)
1193 {
1194 return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1195 }
1196
1197 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1198 size_t count, loff_t *offset)
1199 {
1200 long result, timeout;
1201 int count1;
1202 struct snd_rawmidi_file *rfile;
1203 struct snd_rawmidi_runtime *runtime;
1204 struct snd_rawmidi_substream *substream;
1205
1206 rfile = file->private_data;
1207 substream = rfile->output;
1208 runtime = substream->runtime;
1209 /* we cannot put an atomic message to our buffer */
1210 if (substream->append && count > runtime->buffer_size)
1211 return -EIO;
1212 result = 0;
1213 while (count > 0) {
1214 spin_lock_irq(&runtime->lock);
1215 while (!snd_rawmidi_ready_append(substream, count)) {
1216 wait_queue_t wait;
1217 if (file->f_flags & O_NONBLOCK) {
1218 spin_unlock_irq(&runtime->lock);
1219 return result > 0 ? result : -EAGAIN;
1220 }
1221 init_waitqueue_entry(&wait, current);
1222 add_wait_queue(&runtime->sleep, &wait);
1223 set_current_state(TASK_INTERRUPTIBLE);
1224 spin_unlock_irq(&runtime->lock);
1225 timeout = schedule_timeout(30 * HZ);
1226 remove_wait_queue(&runtime->sleep, &wait);
1227 if (signal_pending(current))
1228 return result > 0 ? result : -ERESTARTSYS;
1229 if (!runtime->avail && !timeout)
1230 return result > 0 ? result : -EIO;
1231 spin_lock_irq(&runtime->lock);
1232 }
1233 spin_unlock_irq(&runtime->lock);
1234 count1 = snd_rawmidi_kernel_write1(substream,
1235 (unsigned char __force *)buf,
1236 count, 0);
1237 if (count1 < 0)
1238 return result > 0 ? result : count1;
1239 result += count1;
1240 buf += count1;
1241 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1242 break;
1243 count -= count1;
1244 }
1245 if (file->f_flags & O_SYNC) {
1246 spin_lock_irq(&runtime->lock);
1247 while (runtime->avail != runtime->buffer_size) {
1248 wait_queue_t wait;
1249 unsigned int last_avail = runtime->avail;
1250 init_waitqueue_entry(&wait, current);
1251 add_wait_queue(&runtime->sleep, &wait);
1252 set_current_state(TASK_INTERRUPTIBLE);
1253 spin_unlock_irq(&runtime->lock);
1254 timeout = schedule_timeout(30 * HZ);
1255 remove_wait_queue(&runtime->sleep, &wait);
1256 if (signal_pending(current))
1257 return result > 0 ? result : -ERESTARTSYS;
1258 if (runtime->avail == last_avail && !timeout)
1259 return result > 0 ? result : -EIO;
1260 spin_lock_irq(&runtime->lock);
1261 }
1262 spin_unlock_irq(&runtime->lock);
1263 }
1264 return result;
1265 }
1266
1267 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1268 {
1269 struct snd_rawmidi_file *rfile;
1270 struct snd_rawmidi_runtime *runtime;
1271 unsigned int mask;
1272
1273 rfile = file->private_data;
1274 if (rfile->input != NULL) {
1275 runtime = rfile->input->runtime;
1276 snd_rawmidi_input_trigger(rfile->input, 1);
1277 poll_wait(file, &runtime->sleep, wait);
1278 }
1279 if (rfile->output != NULL) {
1280 runtime = rfile->output->runtime;
1281 poll_wait(file, &runtime->sleep, wait);
1282 }
1283 mask = 0;
1284 if (rfile->input != NULL) {
1285 if (snd_rawmidi_ready(rfile->input))
1286 mask |= POLLIN | POLLRDNORM;
1287 }
1288 if (rfile->output != NULL) {
1289 if (snd_rawmidi_ready(rfile->output))
1290 mask |= POLLOUT | POLLWRNORM;
1291 }
1292 return mask;
1293 }
1294
1295 /*
1296 */
1297 #ifdef CONFIG_COMPAT
1298 #include "rawmidi_compat.c"
1299 #else
1300 #define snd_rawmidi_ioctl_compat NULL
1301 #endif
1302
1303 /*
1304
1305 */
1306
1307 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1308 struct snd_info_buffer *buffer)
1309 {
1310 struct snd_rawmidi *rmidi;
1311 struct snd_rawmidi_substream *substream;
1312 struct snd_rawmidi_runtime *runtime;
1313 struct list_head *list;
1314
1315 rmidi = entry->private_data;
1316 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1317 down(&rmidi->open_mutex);
1318 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1319 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1320 substream = list_entry(list, struct snd_rawmidi_substream, list);
1321 snd_iprintf(buffer,
1322 "Output %d\n"
1323 " Tx bytes : %lu\n",
1324 substream->number,
1325 (unsigned long) substream->bytes);
1326 if (substream->opened) {
1327 runtime = substream->runtime;
1328 snd_iprintf(buffer,
1329 " Mode : %s\n"
1330 " Buffer size : %lu\n"
1331 " Avail : %lu\n",
1332 runtime->oss ? "OSS compatible" : "native",
1333 (unsigned long) runtime->buffer_size,
1334 (unsigned long) runtime->avail);
1335 }
1336 }
1337 }
1338 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1339 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1340 substream = list_entry(list, struct snd_rawmidi_substream, list);
1341 snd_iprintf(buffer,
1342 "Input %d\n"
1343 " Rx bytes : %lu\n",
1344 substream->number,
1345 (unsigned long) substream->bytes);
1346 if (substream->opened) {
1347 runtime = substream->runtime;
1348 snd_iprintf(buffer,
1349 " Buffer size : %lu\n"
1350 " Avail : %lu\n"
1351 " Overruns : %lu\n",
1352 (unsigned long) runtime->buffer_size,
1353 (unsigned long) runtime->avail,
1354 (unsigned long) runtime->xruns);
1355 }
1356 }
1357 }
1358 up(&rmidi->open_mutex);
1359 }
1360
1361 /*
1362 * Register functions
1363 */
1364
1365 static struct file_operations snd_rawmidi_f_ops =
1366 {
1367 .owner = THIS_MODULE,
1368 .read = snd_rawmidi_read,
1369 .write = snd_rawmidi_write,
1370 .open = snd_rawmidi_open,
1371 .release = snd_rawmidi_release,
1372 .poll = snd_rawmidi_poll,
1373 .unlocked_ioctl = snd_rawmidi_ioctl,
1374 .compat_ioctl = snd_rawmidi_ioctl_compat,
1375 };
1376
1377 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1378 struct snd_rawmidi_str *stream,
1379 int direction,
1380 int count)
1381 {
1382 struct snd_rawmidi_substream *substream;
1383 int idx;
1384
1385 INIT_LIST_HEAD(&stream->substreams);
1386 for (idx = 0; idx < count; idx++) {
1387 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1388 if (substream == NULL) {
1389 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1390 return -ENOMEM;
1391 }
1392 substream->stream = direction;
1393 substream->number = idx;
1394 substream->rmidi = rmidi;
1395 substream->pstr = stream;
1396 list_add_tail(&substream->list, &stream->substreams);
1397 stream->substream_count++;
1398 }
1399 return 0;
1400 }
1401
1402 /**
1403 * snd_rawmidi_new - create a rawmidi instance
1404 * @card: the card instance
1405 * @id: the id string
1406 * @device: the device index
1407 * @output_count: the number of output streams
1408 * @input_count: the number of input streams
1409 * @rrawmidi: the pointer to store the new rawmidi instance
1410 *
1411 * Creates a new rawmidi instance.
1412 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1413 *
1414 * Returns zero if successful, or a negative error code on failure.
1415 */
1416 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1417 int output_count, int input_count,
1418 struct snd_rawmidi ** rrawmidi)
1419 {
1420 struct snd_rawmidi *rmidi;
1421 int err;
1422 static struct snd_device_ops ops = {
1423 .dev_free = snd_rawmidi_dev_free,
1424 .dev_register = snd_rawmidi_dev_register,
1425 .dev_disconnect = snd_rawmidi_dev_disconnect,
1426 .dev_unregister = snd_rawmidi_dev_unregister
1427 };
1428
1429 snd_assert(rrawmidi != NULL, return -EINVAL);
1430 *rrawmidi = NULL;
1431 snd_assert(card != NULL, return -ENXIO);
1432 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1433 if (rmidi == NULL) {
1434 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1435 return -ENOMEM;
1436 }
1437 rmidi->card = card;
1438 rmidi->device = device;
1439 init_MUTEX(&rmidi->open_mutex);
1440 init_waitqueue_head(&rmidi->open_wait);
1441 if (id != NULL)
1442 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1443 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1444 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1445 SNDRV_RAWMIDI_STREAM_INPUT,
1446 input_count)) < 0) {
1447 snd_rawmidi_free(rmidi);
1448 return err;
1449 }
1450 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1451 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1452 SNDRV_RAWMIDI_STREAM_OUTPUT,
1453 output_count)) < 0) {
1454 snd_rawmidi_free(rmidi);
1455 return err;
1456 }
1457 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1458 snd_rawmidi_free(rmidi);
1459 return err;
1460 }
1461 *rrawmidi = rmidi;
1462 return 0;
1463 }
1464
1465 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1466 {
1467 struct snd_rawmidi_substream *substream;
1468
1469 while (!list_empty(&stream->substreams)) {
1470 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1471 list_del(&substream->list);
1472 kfree(substream);
1473 }
1474 }
1475
1476 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1477 {
1478 snd_assert(rmidi != NULL, return -ENXIO);
1479 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1480 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1481 if (rmidi->private_free)
1482 rmidi->private_free(rmidi);
1483 kfree(rmidi);
1484 return 0;
1485 }
1486
1487 static int snd_rawmidi_dev_free(struct snd_device *device)
1488 {
1489 struct snd_rawmidi *rmidi = device->device_data;
1490 return snd_rawmidi_free(rmidi);
1491 }
1492
1493 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1494 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1495 {
1496 struct snd_rawmidi *rmidi = device->private_data;
1497 rmidi->seq_dev = NULL;
1498 }
1499 #endif
1500
1501 static int snd_rawmidi_dev_register(struct snd_device *device)
1502 {
1503 int err;
1504 struct snd_info_entry *entry;
1505 char name[16];
1506 struct snd_rawmidi *rmidi = device->device_data;
1507
1508 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1509 return -ENOMEM;
1510 down(&register_mutex);
1511 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1512 up(&register_mutex);
1513 return -EBUSY;
1514 }
1515 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1516 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1517 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1518 rmidi->card, rmidi->device,
1519 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1520 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1521 list_del(&rmidi->list);
1522 up(&register_mutex);
1523 return err;
1524 }
1525 if (rmidi->ops && rmidi->ops->dev_register &&
1526 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1527 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1528 list_del(&rmidi->list);
1529 up(&register_mutex);
1530 return err;
1531 }
1532 #ifdef CONFIG_SND_OSSEMUL
1533 rmidi->ossreg = 0;
1534 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1535 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1536 rmidi->card, 0, &snd_rawmidi_f_ops,
1537 rmidi, name) < 0) {
1538 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1539 } else {
1540 rmidi->ossreg++;
1541 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1542 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1543 #endif
1544 }
1545 }
1546 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1547 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1548 rmidi->card, 1, &snd_rawmidi_f_ops,
1549 rmidi, name) < 0) {
1550 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1551 } else {
1552 rmidi->ossreg++;
1553 }
1554 }
1555 #endif /* CONFIG_SND_OSSEMUL */
1556 up(&register_mutex);
1557 sprintf(name, "midi%d", rmidi->device);
1558 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1559 if (entry) {
1560 entry->private_data = rmidi;
1561 entry->c.text.read_size = 1024;
1562 entry->c.text.read = snd_rawmidi_proc_info_read;
1563 if (snd_info_register(entry) < 0) {
1564 snd_info_free_entry(entry);
1565 entry = NULL;
1566 }
1567 }
1568 rmidi->proc_entry = entry;
1569 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1570 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1571 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1572 rmidi->seq_dev->private_data = rmidi;
1573 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1574 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1575 snd_device_register(rmidi->card, rmidi->seq_dev);
1576 }
1577 }
1578 #endif
1579 return 0;
1580 }
1581
1582 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1583 {
1584 struct snd_rawmidi *rmidi = device->device_data;
1585
1586 down(&register_mutex);
1587 list_del_init(&rmidi->list);
1588 up(&register_mutex);
1589 return 0;
1590 }
1591
1592 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1593 {
1594 struct snd_rawmidi *rmidi = device->device_data;
1595
1596 snd_assert(rmidi != NULL, return -ENXIO);
1597 down(&register_mutex);
1598 list_del(&rmidi->list);
1599 if (rmidi->proc_entry) {
1600 snd_info_unregister(rmidi->proc_entry);
1601 rmidi->proc_entry = NULL;
1602 }
1603 #ifdef CONFIG_SND_OSSEMUL
1604 if (rmidi->ossreg) {
1605 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1606 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1607 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1608 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1609 #endif
1610 }
1611 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1612 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1613 rmidi->ossreg = 0;
1614 }
1615 #endif /* CONFIG_SND_OSSEMUL */
1616 if (rmidi->ops && rmidi->ops->dev_unregister)
1617 rmidi->ops->dev_unregister(rmidi);
1618 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1619 up(&register_mutex);
1620 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1621 if (rmidi->seq_dev) {
1622 snd_device_free(rmidi->card, rmidi->seq_dev);
1623 rmidi->seq_dev = NULL;
1624 }
1625 #endif
1626 return snd_rawmidi_free(rmidi);
1627 }
1628
1629 /**
1630 * snd_rawmidi_set_ops - set the rawmidi operators
1631 * @rmidi: the rawmidi instance
1632 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1633 * @ops: the operator table
1634 *
1635 * Sets the rawmidi operators for the given stream direction.
1636 */
1637 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1638 struct snd_rawmidi_ops *ops)
1639 {
1640 struct list_head *list;
1641 struct snd_rawmidi_substream *substream;
1642
1643 list_for_each(list, &rmidi->streams[stream].substreams) {
1644 substream = list_entry(list, struct snd_rawmidi_substream, list);
1645 substream->ops = ops;
1646 }
1647 }
1648
1649 /*
1650 * ENTRY functions
1651 */
1652
1653 static int __init alsa_rawmidi_init(void)
1654 {
1655
1656 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1657 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1658 #ifdef CONFIG_SND_OSSEMUL
1659 { int i;
1660 /* check device map table */
1661 for (i = 0; i < SNDRV_CARDS; i++) {
1662 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1663 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1664 midi_map[i] = 0;
1665 }
1666 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1667 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1668 amidi_map[i] = 1;
1669 }
1670 }
1671 }
1672 #endif /* CONFIG_SND_OSSEMUL */
1673 return 0;
1674 }
1675
1676 static void __exit alsa_rawmidi_exit(void)
1677 {
1678 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1679 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1680 }
1681
1682 module_init(alsa_rawmidi_init)
1683 module_exit(alsa_rawmidi_exit)
1684
1685 EXPORT_SYMBOL(snd_rawmidi_output_params);
1686 EXPORT_SYMBOL(snd_rawmidi_input_params);
1687 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1688 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1689 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1690 EXPORT_SYMBOL(snd_rawmidi_receive);
1691 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1692 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit);
1695 EXPORT_SYMBOL(snd_rawmidi_new);
1696 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1697 EXPORT_SYMBOL(snd_rawmidi_info_select);
1698 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1699 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1700 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
kernel-based virtual machine