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[POWERPC] Fix kernel stack allocation alignment
[linux-2.6/zen-sources.git] / sound / core / rawmidi.c
blobf7ea7287c59cd7edfcf75bc5795efce07d512d79
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 (up) {
152 tasklet_hi_schedule(&substream->runtime->tasklet);
153 } else {
154 tasklet_kill(&substream->runtime->tasklet);
155 substream->ops->trigger(substream, 0);
156 }
157 }
158
159 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
160 {
161 substream->ops->trigger(substream, up);
162 if (!up && substream->runtime->event)
163 tasklet_kill(&substream->runtime->tasklet);
164 }
165
166 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
167 {
168 unsigned long flags;
169 struct snd_rawmidi_runtime *runtime = substream->runtime;
170
171 snd_rawmidi_output_trigger(substream, 0);
172 runtime->drain = 0;
173 spin_lock_irqsave(&runtime->lock, flags);
174 runtime->appl_ptr = runtime->hw_ptr = 0;
175 runtime->avail = runtime->buffer_size;
176 spin_unlock_irqrestore(&runtime->lock, flags);
177 return 0;
178 }
179
180 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
181 {
182 int err;
183 long timeout;
184 struct snd_rawmidi_runtime *runtime = substream->runtime;
185
186 err = 0;
187 runtime->drain = 1;
188 timeout = wait_event_interruptible_timeout(runtime->sleep,
189 (runtime->avail >= runtime->buffer_size),
190 10*HZ);
191 if (signal_pending(current))
192 err = -ERESTARTSYS;
193 if (runtime->avail < runtime->buffer_size && !timeout) {
194 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
195 err = -EIO;
196 }
197 runtime->drain = 0;
198 if (err != -ERESTARTSYS) {
199 /* we need wait a while to make sure that Tx FIFOs are empty */
200 if (substream->ops->drain)
201 substream->ops->drain(substream);
202 else
203 msleep(50);
204 snd_rawmidi_drop_output(substream);
205 }
206 return err;
207 }
208
209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210 {
211 unsigned long flags;
212 struct snd_rawmidi_runtime *runtime = substream->runtime;
213
214 snd_rawmidi_input_trigger(substream, 0);
215 runtime->drain = 0;
216 spin_lock_irqsave(&runtime->lock, flags);
217 runtime->appl_ptr = runtime->hw_ptr = 0;
218 runtime->avail = 0;
219 spin_unlock_irqrestore(&runtime->lock, flags);
220 return 0;
221 }
222
223 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
224 int mode, struct snd_rawmidi_file * rfile)
225 {
226 struct snd_rawmidi *rmidi;
227 struct list_head *list1, *list2;
228 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
229 struct snd_rawmidi_runtime *input = NULL, *output = NULL;
230 int err;
231
232 if (rfile)
233 rfile->input = rfile->output = NULL;
234 mutex_lock(&register_mutex);
235 rmidi = snd_rawmidi_search(card, device);
236 mutex_unlock(&register_mutex);
237 if (rmidi == NULL) {
238 err = -ENODEV;
239 goto __error1;
240 }
241 if (!try_module_get(rmidi->card->module)) {
242 err = -EFAULT;
243 goto __error1;
244 }
245 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
246 mutex_lock(&rmidi->open_mutex);
247 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
248 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
249 err = -ENXIO;
250 goto __error;
251 }
252 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
253 err = -ENODEV;
254 goto __error;
255 }
256 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
257 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
258 err = -EAGAIN;
259 goto __error;
260 }
261 }
262 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
263 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
264 err = -ENXIO;
265 goto __error;
266 }
267 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
268 err = -ENODEV;
269 goto __error;
270 }
271 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
272 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
273 err = -EAGAIN;
274 goto __error;
275 }
276 }
277 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
278 while (1) {
279 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
280 sinput = NULL;
281 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
282 err = -EAGAIN;
283 goto __error;
284 }
285 break;
286 }
287 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
288 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
289 goto __nexti;
290 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
291 break;
292 __nexti:
293 list1 = list1->next;
294 }
295 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
296 while (1) {
297 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
298 soutput = NULL;
299 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
300 err = -EAGAIN;
301 goto __error;
302 }
303 break;
304 }
305 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
306 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
307 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
308 if (soutput->opened && !soutput->append)
309 goto __nexto;
310 } else {
311 if (soutput->opened)
312 goto __nexto;
313 }
314 }
315 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
316 break;
317 __nexto:
318 list2 = list2->next;
319 }
320 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
321 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
322 goto __error;
323 input = sinput->runtime;
324 if ((err = sinput->ops->open(sinput)) < 0)
325 goto __error;
326 sinput->opened = 1;
327 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
328 } else {
329 sinput = NULL;
330 }
331 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
332 if (soutput->opened)
333 goto __skip_output;
334 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
335 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
336 sinput->ops->close(sinput);
337 goto __error;
338 }
339 output = soutput->runtime;
340 if ((err = soutput->ops->open(soutput)) < 0) {
341 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
342 sinput->ops->close(sinput);
343 goto __error;
344 }
345 __skip_output:
346 soutput->opened = 1;
347 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
348 soutput->append = 1;
349 if (soutput->use_count++ == 0)
350 soutput->active_sensing = 1;
351 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
352 } else {
353 soutput = NULL;
354 }
355 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
356 mutex_unlock(&rmidi->open_mutex);
357 if (rfile) {
358 rfile->rmidi = rmidi;
359 rfile->input = sinput;
360 rfile->output = soutput;
361 }
362 return 0;
363
364 __error:
365 if (input != NULL)
366 snd_rawmidi_runtime_free(sinput);
367 if (output != NULL)
368 snd_rawmidi_runtime_free(soutput);
369 module_put(rmidi->card->module);
370 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
371 mutex_unlock(&rmidi->open_mutex);
372 __error1:
373 return err;
374 }
375
376 static int snd_rawmidi_open(struct inode *inode, struct file *file)
377 {
378 int maj = imajor(inode);
379 struct snd_card *card;
380 int subdevice;
381 unsigned short fflags;
382 int err;
383 struct snd_rawmidi *rmidi;
384 struct snd_rawmidi_file *rawmidi_file;
385 wait_queue_t wait;
386 struct snd_ctl_file *kctl;
387
388 if (maj == snd_major) {
389 rmidi = snd_lookup_minor_data(iminor(inode),
390 SNDRV_DEVICE_TYPE_RAWMIDI);
391 #ifdef CONFIG_SND_OSSEMUL
392 } else if (maj == SOUND_MAJOR) {
393 rmidi = snd_lookup_oss_minor_data(iminor(inode),
394 SNDRV_OSS_DEVICE_TYPE_MIDI);
395 #endif
396 } else
397 return -ENXIO;
398
399 if (rmidi == NULL)
400 return -ENODEV;
401 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
402 return -EINVAL; /* invalid combination */
403 card = rmidi->card;
404 err = snd_card_file_add(card, file);
405 if (err < 0)
406 return -ENODEV;
407 fflags = snd_rawmidi_file_flags(file);
408 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
409 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
410 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
411 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
412 if (rawmidi_file == NULL) {
413 snd_card_file_remove(card, file);
414 return -ENOMEM;
415 }
416 init_waitqueue_entry(&wait, current);
417 add_wait_queue(&rmidi->open_wait, &wait);
418 mutex_lock(&rmidi->open_mutex);
419 while (1) {
420 subdevice = -1;
421 down_read(&card->controls_rwsem);
422 list_for_each_entry(kctl, &card->ctl_files, list) {
423 if (kctl->pid == current->pid) {
424 subdevice = kctl->prefer_rawmidi_subdevice;
425 if (subdevice != -1)
426 break;
427 }
428 }
429 up_read(&card->controls_rwsem);
430 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
431 subdevice, fflags, rawmidi_file);
432 if (err >= 0)
433 break;
434 if (err == -EAGAIN) {
435 if (file->f_flags & O_NONBLOCK) {
436 err = -EBUSY;
437 break;
438 }
439 } else
440 break;
441 set_current_state(TASK_INTERRUPTIBLE);
442 mutex_unlock(&rmidi->open_mutex);
443 schedule();
444 mutex_lock(&rmidi->open_mutex);
445 if (signal_pending(current)) {
446 err = -ERESTARTSYS;
447 break;
448 }
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 remove_wait_queue(&rmidi->open_wait, &wait);
457 if (err >= 0) {
458 file->private_data = rawmidi_file;
459 } else {
460 snd_card_file_remove(card, file);
461 kfree(rawmidi_file);
462 }
463 mutex_unlock(&rmidi->open_mutex);
464 return err;
465 }
466
467 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
468 {
469 struct snd_rawmidi *rmidi;
470 struct snd_rawmidi_substream *substream;
471 struct snd_rawmidi_runtime *runtime;
472
473 snd_assert(rfile != NULL, return -ENXIO);
474 snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
475 rmidi = rfile->rmidi;
476 mutex_lock(&rmidi->open_mutex);
477 if (rfile->input != NULL) {
478 substream = rfile->input;
479 rfile->input = NULL;
480 runtime = substream->runtime;
481 snd_rawmidi_input_trigger(substream, 0);
482 substream->ops->close(substream);
483 if (runtime->private_free != NULL)
484 runtime->private_free(substream);
485 snd_rawmidi_runtime_free(substream);
486 substream->opened = 0;
487 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
488 }
489 if (rfile->output != NULL) {
490 substream = rfile->output;
491 rfile->output = NULL;
492 if (--substream->use_count == 0) {
493 runtime = substream->runtime;
494 if (substream->active_sensing) {
495 unsigned char buf = 0xfe;
496 /* sending single active sensing message to shut the device up */
497 snd_rawmidi_kernel_write(substream, &buf, 1);
498 }
499 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
500 snd_rawmidi_output_trigger(substream, 0);
501 substream->ops->close(substream);
502 if (runtime->private_free != NULL)
503 runtime->private_free(substream);
504 snd_rawmidi_runtime_free(substream);
505 substream->opened = 0;
506 substream->append = 0;
507 }
508 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
509 }
510 mutex_unlock(&rmidi->open_mutex);
511 module_put(rmidi->card->module);
512 return 0;
513 }
514
515 static int snd_rawmidi_release(struct inode *inode, struct file *file)
516 {
517 struct snd_rawmidi_file *rfile;
518 struct snd_rawmidi *rmidi;
519 int err;
520
521 rfile = file->private_data;
522 err = snd_rawmidi_kernel_release(rfile);
523 rmidi = rfile->rmidi;
524 wake_up(&rmidi->open_wait);
525 kfree(rfile);
526 snd_card_file_remove(rmidi->card, file);
527 return err;
528 }
529
530 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
531 struct snd_rawmidi_info *info)
532 {
533 struct snd_rawmidi *rmidi;
534
535 if (substream == NULL)
536 return -ENODEV;
537 rmidi = substream->rmidi;
538 memset(info, 0, sizeof(*info));
539 info->card = rmidi->card->number;
540 info->device = rmidi->device;
541 info->subdevice = substream->number;
542 info->stream = substream->stream;
543 info->flags = rmidi->info_flags;
544 strcpy(info->id, rmidi->id);
545 strcpy(info->name, rmidi->name);
546 strcpy(info->subname, substream->name);
547 info->subdevices_count = substream->pstr->substream_count;
548 info->subdevices_avail = (substream->pstr->substream_count -
549 substream->pstr->substream_opened);
550 return 0;
551 }
552
553 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
554 struct snd_rawmidi_info __user * _info)
555 {
556 struct snd_rawmidi_info info;
557 int err;
558 if ((err = snd_rawmidi_info(substream, &info)) < 0)
559 return err;
560 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
561 return -EFAULT;
562 return 0;
563 }
564
565 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
566 {
567 struct snd_rawmidi *rmidi;
568 struct snd_rawmidi_str *pstr;
569 struct snd_rawmidi_substream *substream;
570
571 mutex_lock(&register_mutex);
572 rmidi = snd_rawmidi_search(card, info->device);
573 mutex_unlock(&register_mutex);
574 if (!rmidi)
575 return -ENXIO;
576 if (info->stream < 0 || info->stream > 1)
577 return -EINVAL;
578 pstr = &rmidi->streams[info->stream];
579 if (pstr->substream_count == 0)
580 return -ENOENT;
581 if (info->subdevice >= pstr->substream_count)
582 return -ENXIO;
583 list_for_each_entry(substream, &pstr->substreams, list) {
584 if ((unsigned int)substream->number == info->subdevice)
585 return snd_rawmidi_info(substream, info);
586 }
587 return -ENXIO;
588 }
589
590 static int snd_rawmidi_info_select_user(struct snd_card *card,
591 struct snd_rawmidi_info __user *_info)
592 {
593 int err;
594 struct snd_rawmidi_info info;
595 if (get_user(info.device, &_info->device))
596 return -EFAULT;
597 if (get_user(info.stream, &_info->stream))
598 return -EFAULT;
599 if (get_user(info.subdevice, &_info->subdevice))
600 return -EFAULT;
601 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
602 return err;
603 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
604 return -EFAULT;
605 return 0;
606 }
607
608 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
609 struct snd_rawmidi_params * params)
610 {
611 char *newbuf;
612 struct snd_rawmidi_runtime *runtime = substream->runtime;
613
614 if (substream->append && substream->use_count > 1)
615 return -EBUSY;
616 snd_rawmidi_drain_output(substream);
617 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
618 return -EINVAL;
619 }
620 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
621 return -EINVAL;
622 }
623 if (params->buffer_size != runtime->buffer_size) {
624 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
625 if (!newbuf)
626 return -ENOMEM;
627 kfree(runtime->buffer);
628 runtime->buffer = newbuf;
629 runtime->buffer_size = params->buffer_size;
630 runtime->avail = runtime->buffer_size;
631 }
632 runtime->avail_min = params->avail_min;
633 substream->active_sensing = !params->no_active_sensing;
634 return 0;
635 }
636
637 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
638 struct snd_rawmidi_params * params)
639 {
640 char *newbuf;
641 struct snd_rawmidi_runtime *runtime = substream->runtime;
642
643 snd_rawmidi_drain_input(substream);
644 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
645 return -EINVAL;
646 }
647 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
648 return -EINVAL;
649 }
650 if (params->buffer_size != runtime->buffer_size) {
651 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
652 if (!newbuf)
653 return -ENOMEM;
654 kfree(runtime->buffer);
655 runtime->buffer = newbuf;
656 runtime->buffer_size = params->buffer_size;
657 }
658 runtime->avail_min = params->avail_min;
659 return 0;
660 }
661
662 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
663 struct snd_rawmidi_status * status)
664 {
665 struct snd_rawmidi_runtime *runtime = substream->runtime;
666
667 memset(status, 0, sizeof(*status));
668 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
669 spin_lock_irq(&runtime->lock);
670 status->avail = runtime->avail;
671 spin_unlock_irq(&runtime->lock);
672 return 0;
673 }
674
675 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
676 struct snd_rawmidi_status * status)
677 {
678 struct snd_rawmidi_runtime *runtime = substream->runtime;
679
680 memset(status, 0, sizeof(*status));
681 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
682 spin_lock_irq(&runtime->lock);
683 status->avail = runtime->avail;
684 status->xruns = runtime->xruns;
685 runtime->xruns = 0;
686 spin_unlock_irq(&runtime->lock);
687 return 0;
688 }
689
690 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
691 {
692 struct snd_rawmidi_file *rfile;
693 void __user *argp = (void __user *)arg;
694
695 rfile = file->private_data;
696 if (((cmd >> 8) & 0xff) != 'W')
697 return -ENOTTY;
698 switch (cmd) {
699 case SNDRV_RAWMIDI_IOCTL_PVERSION:
700 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
701 case SNDRV_RAWMIDI_IOCTL_INFO:
702 {
703 int stream;
704 struct snd_rawmidi_info __user *info = argp;
705 if (get_user(stream, &info->stream))
706 return -EFAULT;
707 switch (stream) {
708 case SNDRV_RAWMIDI_STREAM_INPUT:
709 return snd_rawmidi_info_user(rfile->input, info);
710 case SNDRV_RAWMIDI_STREAM_OUTPUT:
711 return snd_rawmidi_info_user(rfile->output, info);
712 default:
713 return -EINVAL;
714 }
715 }
716 case SNDRV_RAWMIDI_IOCTL_PARAMS:
717 {
718 struct snd_rawmidi_params params;
719 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
720 return -EFAULT;
721 switch (params.stream) {
722 case SNDRV_RAWMIDI_STREAM_OUTPUT:
723 if (rfile->output == NULL)
724 return -EINVAL;
725 return snd_rawmidi_output_params(rfile->output, &params);
726 case SNDRV_RAWMIDI_STREAM_INPUT:
727 if (rfile->input == NULL)
728 return -EINVAL;
729 return snd_rawmidi_input_params(rfile->input, &params);
730 default:
731 return -EINVAL;
732 }
733 }
734 case SNDRV_RAWMIDI_IOCTL_STATUS:
735 {
736 int err = 0;
737 struct snd_rawmidi_status status;
738 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
739 return -EFAULT;
740 switch (status.stream) {
741 case SNDRV_RAWMIDI_STREAM_OUTPUT:
742 if (rfile->output == NULL)
743 return -EINVAL;
744 err = snd_rawmidi_output_status(rfile->output, &status);
745 break;
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 err = snd_rawmidi_input_status(rfile->input, &status);
750 break;
751 default:
752 return -EINVAL;
753 }
754 if (err < 0)
755 return err;
756 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
757 return -EFAULT;
758 return 0;
759 }
760 case SNDRV_RAWMIDI_IOCTL_DROP:
761 {
762 int val;
763 if (get_user(val, (int __user *) argp))
764 return -EFAULT;
765 switch (val) {
766 case SNDRV_RAWMIDI_STREAM_OUTPUT:
767 if (rfile->output == NULL)
768 return -EINVAL;
769 return snd_rawmidi_drop_output(rfile->output);
770 default:
771 return -EINVAL;
772 }
773 }
774 case SNDRV_RAWMIDI_IOCTL_DRAIN:
775 {
776 int val;
777 if (get_user(val, (int __user *) argp))
778 return -EFAULT;
779 switch (val) {
780 case SNDRV_RAWMIDI_STREAM_OUTPUT:
781 if (rfile->output == NULL)
782 return -EINVAL;
783 return snd_rawmidi_drain_output(rfile->output);
784 case SNDRV_RAWMIDI_STREAM_INPUT:
785 if (rfile->input == NULL)
786 return -EINVAL;
787 return snd_rawmidi_drain_input(rfile->input);
788 default:
789 return -EINVAL;
790 }
791 }
792 #ifdef CONFIG_SND_DEBUG
793 default:
794 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
795 #endif
796 }
797 return -ENOTTY;
798 }
799
800 static int snd_rawmidi_control_ioctl(struct snd_card *card,
801 struct snd_ctl_file *control,
802 unsigned int cmd,
803 unsigned long arg)
804 {
805 void __user *argp = (void __user *)arg;
806
807 switch (cmd) {
808 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
809 {
810 int device;
811
812 if (get_user(device, (int __user *)argp))
813 return -EFAULT;
814 mutex_lock(&register_mutex);
815 device = device < 0 ? 0 : device + 1;
816 while (device < SNDRV_RAWMIDI_DEVICES) {
817 if (snd_rawmidi_search(card, device))
818 break;
819 device++;
820 }
821 if (device == SNDRV_RAWMIDI_DEVICES)
822 device = -1;
823 mutex_unlock(&register_mutex);
824 if (put_user(device, (int __user *)argp))
825 return -EFAULT;
826 return 0;
827 }
828 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
829 {
830 int val;
831
832 if (get_user(val, (int __user *)argp))
833 return -EFAULT;
834 control->prefer_rawmidi_subdevice = val;
835 return 0;
836 }
837 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
838 return snd_rawmidi_info_select_user(card, argp);
839 }
840 return -ENOIOCTLCMD;
841 }
842
843 /**
844 * snd_rawmidi_receive - receive the input data from the device
845 * @substream: the rawmidi substream
846 * @buffer: the buffer pointer
847 * @count: the data size to read
848 *
849 * Reads the data from the internal buffer.
850 *
851 * Returns the size of read data, or a negative error code on failure.
852 */
853 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
854 const unsigned char *buffer, int count)
855 {
856 unsigned long flags;
857 int result = 0, count1;
858 struct snd_rawmidi_runtime *runtime = substream->runtime;
859
860 if (runtime->buffer == NULL) {
861 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
862 return -EINVAL;
863 }
864 spin_lock_irqsave(&runtime->lock, flags);
865 if (count == 1) { /* special case, faster code */
866 substream->bytes++;
867 if (runtime->avail < runtime->buffer_size) {
868 runtime->buffer[runtime->hw_ptr++] = buffer[0];
869 runtime->hw_ptr %= runtime->buffer_size;
870 runtime->avail++;
871 result++;
872 } else {
873 runtime->xruns++;
874 }
875 } else {
876 substream->bytes += count;
877 count1 = runtime->buffer_size - runtime->hw_ptr;
878 if (count1 > count)
879 count1 = count;
880 if (count1 > (int)(runtime->buffer_size - runtime->avail))
881 count1 = runtime->buffer_size - runtime->avail;
882 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
883 runtime->hw_ptr += count1;
884 runtime->hw_ptr %= runtime->buffer_size;
885 runtime->avail += count1;
886 count -= count1;
887 result += count1;
888 if (count > 0) {
889 buffer += count1;
890 count1 = count;
891 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
892 count1 = runtime->buffer_size - runtime->avail;
893 runtime->xruns += count - count1;
894 }
895 if (count1 > 0) {
896 memcpy(runtime->buffer, buffer, count1);
897 runtime->hw_ptr = count1;
898 runtime->avail += count1;
899 result += count1;
900 }
901 }
902 }
903 if (result > 0) {
904 if (runtime->event)
905 tasklet_hi_schedule(&runtime->tasklet);
906 else if (snd_rawmidi_ready(substream))
907 wake_up(&runtime->sleep);
908 }
909 spin_unlock_irqrestore(&runtime->lock, flags);
910 return result;
911 }
912
913 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
914 unsigned char __user *userbuf,
915 unsigned char *kernelbuf, long count)
916 {
917 unsigned long flags;
918 long result = 0, count1;
919 struct snd_rawmidi_runtime *runtime = substream->runtime;
920
921 while (count > 0 && runtime->avail) {
922 count1 = runtime->buffer_size - runtime->appl_ptr;
923 if (count1 > count)
924 count1 = count;
925 spin_lock_irqsave(&runtime->lock, flags);
926 if (count1 > (int)runtime->avail)
927 count1 = runtime->avail;
928 if (kernelbuf)
929 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
930 if (userbuf) {
931 spin_unlock_irqrestore(&runtime->lock, flags);
932 if (copy_to_user(userbuf + result,
933 runtime->buffer + runtime->appl_ptr, count1)) {
934 return result > 0 ? result : -EFAULT;
935 }
936 spin_lock_irqsave(&runtime->lock, flags);
937 }
938 runtime->appl_ptr += count1;
939 runtime->appl_ptr %= runtime->buffer_size;
940 runtime->avail -= count1;
941 spin_unlock_irqrestore(&runtime->lock, flags);
942 result += count1;
943 count -= count1;
944 }
945 return result;
946 }
947
948 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
949 unsigned char *buf, long count)
950 {
951 snd_rawmidi_input_trigger(substream, 1);
952 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
953 }
954
955 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
956 loff_t *offset)
957 {
958 long result;
959 int count1;
960 struct snd_rawmidi_file *rfile;
961 struct snd_rawmidi_substream *substream;
962 struct snd_rawmidi_runtime *runtime;
963
964 rfile = file->private_data;
965 substream = rfile->input;
966 if (substream == NULL)
967 return -EIO;
968 runtime = substream->runtime;
969 snd_rawmidi_input_trigger(substream, 1);
970 result = 0;
971 while (count > 0) {
972 spin_lock_irq(&runtime->lock);
973 while (!snd_rawmidi_ready(substream)) {
974 wait_queue_t wait;
975 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
976 spin_unlock_irq(&runtime->lock);
977 return result > 0 ? result : -EAGAIN;
978 }
979 init_waitqueue_entry(&wait, current);
980 add_wait_queue(&runtime->sleep, &wait);
981 set_current_state(TASK_INTERRUPTIBLE);
982 spin_unlock_irq(&runtime->lock);
983 schedule();
984 remove_wait_queue(&runtime->sleep, &wait);
985 if (signal_pending(current))
986 return result > 0 ? result : -ERESTARTSYS;
987 if (!runtime->avail)
988 return result > 0 ? result : -EIO;
989 spin_lock_irq(&runtime->lock);
990 }
991 spin_unlock_irq(&runtime->lock);
992 count1 = snd_rawmidi_kernel_read1(substream,
993 (unsigned char __user *)buf,
994 NULL/*kernelbuf*/,
995 count);
996 if (count1 < 0)
997 return result > 0 ? result : count1;
998 result += count1;
999 buf += count1;
1000 count -= count1;
1001 }
1002 return result;
1003 }
1004
1005 /**
1006 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1007 * @substream: the rawmidi substream
1008 *
1009 * Returns 1 if the internal output buffer is empty, 0 if not.
1010 */
1011 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1012 {
1013 struct snd_rawmidi_runtime *runtime = substream->runtime;
1014 int result;
1015 unsigned long flags;
1016
1017 if (runtime->buffer == NULL) {
1018 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1019 return 1;
1020 }
1021 spin_lock_irqsave(&runtime->lock, flags);
1022 result = runtime->avail >= runtime->buffer_size;
1023 spin_unlock_irqrestore(&runtime->lock, flags);
1024 return result;
1025 }
1026
1027 /**
1028 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1029 * @substream: the rawmidi substream
1030 * @buffer: the buffer pointer
1031 * @count: data size to transfer
1032 *
1033 * Copies data from the internal output buffer to the given buffer.
1034 *
1035 * Call this in the interrupt handler when the midi output is ready,
1036 * and call snd_rawmidi_transmit_ack() after the transmission is
1037 * finished.
1038 *
1039 * Returns the size of copied data, or a negative error code on failure.
1040 */
1041 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1042 unsigned char *buffer, int count)
1043 {
1044 unsigned long flags;
1045 int result, count1;
1046 struct snd_rawmidi_runtime *runtime = substream->runtime;
1047
1048 if (runtime->buffer == NULL) {
1049 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1050 return -EINVAL;
1051 }
1052 result = 0;
1053 spin_lock_irqsave(&runtime->lock, flags);
1054 if (runtime->avail >= runtime->buffer_size) {
1055 /* warning: lowlevel layer MUST trigger down the hardware */
1056 goto __skip;
1057 }
1058 if (count == 1) { /* special case, faster code */
1059 *buffer = runtime->buffer[runtime->hw_ptr];
1060 result++;
1061 } else {
1062 count1 = runtime->buffer_size - runtime->hw_ptr;
1063 if (count1 > count)
1064 count1 = count;
1065 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1066 count1 = runtime->buffer_size - runtime->avail;
1067 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1068 count -= count1;
1069 result += count1;
1070 if (count > 0) {
1071 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1072 count = runtime->buffer_size - runtime->avail - count1;
1073 memcpy(buffer + count1, runtime->buffer, count);
1074 result += count;
1075 }
1076 }
1077 __skip:
1078 spin_unlock_irqrestore(&runtime->lock, flags);
1079 return result;
1080 }
1081
1082 /**
1083 * snd_rawmidi_transmit_ack - acknowledge the transmission
1084 * @substream: the rawmidi substream
1085 * @count: the tranferred count
1086 *
1087 * Advances the hardware pointer for the internal output buffer with
1088 * the given size and updates the condition.
1089 * Call after the transmission is finished.
1090 *
1091 * Returns the advanced size if successful, or a negative error code on failure.
1092 */
1093 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1094 {
1095 unsigned long flags;
1096 struct snd_rawmidi_runtime *runtime = substream->runtime;
1097
1098 if (runtime->buffer == NULL) {
1099 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1100 return -EINVAL;
1101 }
1102 spin_lock_irqsave(&runtime->lock, flags);
1103 snd_assert(runtime->avail + count <= runtime->buffer_size, );
1104 runtime->hw_ptr += count;
1105 runtime->hw_ptr %= runtime->buffer_size;
1106 runtime->avail += count;
1107 substream->bytes += count;
1108 if (count > 0) {
1109 if (runtime->drain || snd_rawmidi_ready(substream))
1110 wake_up(&runtime->sleep);
1111 }
1112 spin_unlock_irqrestore(&runtime->lock, flags);
1113 return count;
1114 }
1115
1116 /**
1117 * snd_rawmidi_transmit - copy from the buffer to the device
1118 * @substream: the rawmidi substream
1119 * @buffer: the buffer pointer
1120 * @count: the data size to transfer
1121 *
1122 * Copies data from the buffer to the device and advances the pointer.
1123 *
1124 * Returns the copied size if successful, or a negative error code on failure.
1125 */
1126 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1127 unsigned char *buffer, int count)
1128 {
1129 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1130 if (count < 0)
1131 return count;
1132 return snd_rawmidi_transmit_ack(substream, count);
1133 }
1134
1135 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1136 const unsigned char __user *userbuf,
1137 const unsigned char *kernelbuf,
1138 long count)
1139 {
1140 unsigned long flags;
1141 long count1, result;
1142 struct snd_rawmidi_runtime *runtime = substream->runtime;
1143
1144 snd_assert(kernelbuf != NULL || userbuf != NULL, return -EINVAL);
1145 snd_assert(runtime->buffer != NULL, return -EINVAL);
1146
1147 result = 0;
1148 spin_lock_irqsave(&runtime->lock, flags);
1149 if (substream->append) {
1150 if ((long)runtime->avail < count) {
1151 spin_unlock_irqrestore(&runtime->lock, flags);
1152 return -EAGAIN;
1153 }
1154 }
1155 while (count > 0 && runtime->avail > 0) {
1156 count1 = runtime->buffer_size - runtime->appl_ptr;
1157 if (count1 > count)
1158 count1 = count;
1159 if (count1 > (long)runtime->avail)
1160 count1 = runtime->avail;
1161 if (kernelbuf)
1162 memcpy(runtime->buffer + runtime->appl_ptr,
1163 kernelbuf + result, count1);
1164 else if (userbuf) {
1165 spin_unlock_irqrestore(&runtime->lock, flags);
1166 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1167 userbuf + result, count1)) {
1168 spin_lock_irqsave(&runtime->lock, flags);
1169 result = result > 0 ? result : -EFAULT;
1170 goto __end;
1171 }
1172 spin_lock_irqsave(&runtime->lock, flags);
1173 }
1174 runtime->appl_ptr += count1;
1175 runtime->appl_ptr %= runtime->buffer_size;
1176 runtime->avail -= count1;
1177 result += count1;
1178 count -= count1;
1179 }
1180 __end:
1181 count1 = runtime->avail < runtime->buffer_size;
1182 spin_unlock_irqrestore(&runtime->lock, flags);
1183 if (count1)
1184 snd_rawmidi_output_trigger(substream, 1);
1185 return result;
1186 }
1187
1188 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1189 const unsigned char *buf, long count)
1190 {
1191 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1192 }
1193
1194 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1195 size_t count, loff_t *offset)
1196 {
1197 long result, timeout;
1198 int count1;
1199 struct snd_rawmidi_file *rfile;
1200 struct snd_rawmidi_runtime *runtime;
1201 struct snd_rawmidi_substream *substream;
1202
1203 rfile = file->private_data;
1204 substream = rfile->output;
1205 runtime = substream->runtime;
1206 /* we cannot put an atomic message to our buffer */
1207 if (substream->append && count > runtime->buffer_size)
1208 return -EIO;
1209 result = 0;
1210 while (count > 0) {
1211 spin_lock_irq(&runtime->lock);
1212 while (!snd_rawmidi_ready_append(substream, count)) {
1213 wait_queue_t wait;
1214 if (file->f_flags & O_NONBLOCK) {
1215 spin_unlock_irq(&runtime->lock);
1216 return result > 0 ? result : -EAGAIN;
1217 }
1218 init_waitqueue_entry(&wait, current);
1219 add_wait_queue(&runtime->sleep, &wait);
1220 set_current_state(TASK_INTERRUPTIBLE);
1221 spin_unlock_irq(&runtime->lock);
1222 timeout = schedule_timeout(30 * HZ);
1223 remove_wait_queue(&runtime->sleep, &wait);
1224 if (signal_pending(current))
1225 return result > 0 ? result : -ERESTARTSYS;
1226 if (!runtime->avail && !timeout)
1227 return result > 0 ? result : -EIO;
1228 spin_lock_irq(&runtime->lock);
1229 }
1230 spin_unlock_irq(&runtime->lock);
1231 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1232 if (count1 < 0)
1233 return result > 0 ? result : count1;
1234 result += count1;
1235 buf += count1;
1236 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1237 break;
1238 count -= count1;
1239 }
1240 if (file->f_flags & O_SYNC) {
1241 spin_lock_irq(&runtime->lock);
1242 while (runtime->avail != runtime->buffer_size) {
1243 wait_queue_t wait;
1244 unsigned int last_avail = runtime->avail;
1245 init_waitqueue_entry(&wait, current);
1246 add_wait_queue(&runtime->sleep, &wait);
1247 set_current_state(TASK_INTERRUPTIBLE);
1248 spin_unlock_irq(&runtime->lock);
1249 timeout = schedule_timeout(30 * HZ);
1250 remove_wait_queue(&runtime->sleep, &wait);
1251 if (signal_pending(current))
1252 return result > 0 ? result : -ERESTARTSYS;
1253 if (runtime->avail == last_avail && !timeout)
1254 return result > 0 ? result : -EIO;
1255 spin_lock_irq(&runtime->lock);
1256 }
1257 spin_unlock_irq(&runtime->lock);
1258 }
1259 return result;
1260 }
1261
1262 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1263 {
1264 struct snd_rawmidi_file *rfile;
1265 struct snd_rawmidi_runtime *runtime;
1266 unsigned int mask;
1267
1268 rfile = file->private_data;
1269 if (rfile->input != NULL) {
1270 runtime = rfile->input->runtime;
1271 snd_rawmidi_input_trigger(rfile->input, 1);
1272 poll_wait(file, &runtime->sleep, wait);
1273 }
1274 if (rfile->output != NULL) {
1275 runtime = rfile->output->runtime;
1276 poll_wait(file, &runtime->sleep, wait);
1277 }
1278 mask = 0;
1279 if (rfile->input != NULL) {
1280 if (snd_rawmidi_ready(rfile->input))
1281 mask |= POLLIN | POLLRDNORM;
1282 }
1283 if (rfile->output != NULL) {
1284 if (snd_rawmidi_ready(rfile->output))
1285 mask |= POLLOUT | POLLWRNORM;
1286 }
1287 return mask;
1288 }
1289
1290 /*
1291 */
1292 #ifdef CONFIG_COMPAT
1293 #include "rawmidi_compat.c"
1294 #else
1295 #define snd_rawmidi_ioctl_compat NULL
1296 #endif
1297
1298 /*
1299
1300 */
1301
1302 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1303 struct snd_info_buffer *buffer)
1304 {
1305 struct snd_rawmidi *rmidi;
1306 struct snd_rawmidi_substream *substream;
1307 struct snd_rawmidi_runtime *runtime;
1308
1309 rmidi = entry->private_data;
1310 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1311 mutex_lock(&rmidi->open_mutex);
1312 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1313 list_for_each_entry(substream,
1314 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1315 list) {
1316 snd_iprintf(buffer,
1317 "Output %d\n"
1318 " Tx bytes : %lu\n",
1319 substream->number,
1320 (unsigned long) substream->bytes);
1321 if (substream->opened) {
1322 runtime = substream->runtime;
1323 snd_iprintf(buffer,
1324 " Mode : %s\n"
1325 " Buffer size : %lu\n"
1326 " Avail : %lu\n",
1327 runtime->oss ? "OSS compatible" : "native",
1328 (unsigned long) runtime->buffer_size,
1329 (unsigned long) runtime->avail);
1330 }
1331 }
1332 }
1333 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1334 list_for_each_entry(substream,
1335 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1336 list) {
1337 snd_iprintf(buffer,
1338 "Input %d\n"
1339 " Rx bytes : %lu\n",
1340 substream->number,
1341 (unsigned long) substream->bytes);
1342 if (substream->opened) {
1343 runtime = substream->runtime;
1344 snd_iprintf(buffer,
1345 " Buffer size : %lu\n"
1346 " Avail : %lu\n"
1347 " Overruns : %lu\n",
1348 (unsigned long) runtime->buffer_size,
1349 (unsigned long) runtime->avail,
1350 (unsigned long) runtime->xruns);
1351 }
1352 }
1353 }
1354 mutex_unlock(&rmidi->open_mutex);
1355 }
1356
1357 /*
1358 * Register functions
1359 */
1360
1361 static const struct file_operations snd_rawmidi_f_ops =
1362 {
1363 .owner = THIS_MODULE,
1364 .read = snd_rawmidi_read,
1365 .write = snd_rawmidi_write,
1366 .open = snd_rawmidi_open,
1367 .release = snd_rawmidi_release,
1368 .poll = snd_rawmidi_poll,
1369 .unlocked_ioctl = snd_rawmidi_ioctl,
1370 .compat_ioctl = snd_rawmidi_ioctl_compat,
1371 };
1372
1373 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1374 struct snd_rawmidi_str *stream,
1375 int direction,
1376 int count)
1377 {
1378 struct snd_rawmidi_substream *substream;
1379 int idx;
1380
1381 for (idx = 0; idx < count; idx++) {
1382 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1383 if (substream == NULL) {
1384 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1385 return -ENOMEM;
1386 }
1387 substream->stream = direction;
1388 substream->number = idx;
1389 substream->rmidi = rmidi;
1390 substream->pstr = stream;
1391 list_add_tail(&substream->list, &stream->substreams);
1392 stream->substream_count++;
1393 }
1394 return 0;
1395 }
1396
1397 /**
1398 * snd_rawmidi_new - create a rawmidi instance
1399 * @card: the card instance
1400 * @id: the id string
1401 * @device: the device index
1402 * @output_count: the number of output streams
1403 * @input_count: the number of input streams
1404 * @rrawmidi: the pointer to store the new rawmidi instance
1405 *
1406 * Creates a new rawmidi instance.
1407 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1408 *
1409 * Returns zero if successful, or a negative error code on failure.
1410 */
1411 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1412 int output_count, int input_count,
1413 struct snd_rawmidi ** rrawmidi)
1414 {
1415 struct snd_rawmidi *rmidi;
1416 int err;
1417 static struct snd_device_ops ops = {
1418 .dev_free = snd_rawmidi_dev_free,
1419 .dev_register = snd_rawmidi_dev_register,
1420 .dev_disconnect = snd_rawmidi_dev_disconnect,
1421 };
1422
1423 snd_assert(rrawmidi != NULL, return -EINVAL);
1424 *rrawmidi = NULL;
1425 snd_assert(card != NULL, return -ENXIO);
1426 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1427 if (rmidi == NULL) {
1428 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1429 return -ENOMEM;
1430 }
1431 rmidi->card = card;
1432 rmidi->device = device;
1433 mutex_init(&rmidi->open_mutex);
1434 init_waitqueue_head(&rmidi->open_wait);
1435 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1436 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1437
1438 if (id != NULL)
1439 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1440 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1441 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1442 SNDRV_RAWMIDI_STREAM_INPUT,
1443 input_count)) < 0) {
1444 snd_rawmidi_free(rmidi);
1445 return err;
1446 }
1447 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1448 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1449 SNDRV_RAWMIDI_STREAM_OUTPUT,
1450 output_count)) < 0) {
1451 snd_rawmidi_free(rmidi);
1452 return err;
1453 }
1454 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1455 snd_rawmidi_free(rmidi);
1456 return err;
1457 }
1458 *rrawmidi = rmidi;
1459 return 0;
1460 }
1461
1462 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1463 {
1464 struct snd_rawmidi_substream *substream;
1465
1466 while (!list_empty(&stream->substreams)) {
1467 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1468 list_del(&substream->list);
1469 kfree(substream);
1470 }
1471 }
1472
1473 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1474 {
1475 snd_assert(rmidi != NULL, return -ENXIO);
1476
1477 snd_info_free_entry(rmidi->proc_entry);
1478 rmidi->proc_entry = NULL;
1479 mutex_lock(&register_mutex);
1480 if (rmidi->ops && rmidi->ops->dev_unregister)
1481 rmidi->ops->dev_unregister(rmidi);
1482 mutex_unlock(&register_mutex);
1483
1484 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1485 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1486 if (rmidi->private_free)
1487 rmidi->private_free(rmidi);
1488 kfree(rmidi);
1489 return 0;
1490 }
1491
1492 static int snd_rawmidi_dev_free(struct snd_device *device)
1493 {
1494 struct snd_rawmidi *rmidi = device->device_data;
1495 return snd_rawmidi_free(rmidi);
1496 }
1497
1498 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1499 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1500 {
1501 struct snd_rawmidi *rmidi = device->private_data;
1502 rmidi->seq_dev = NULL;
1503 }
1504 #endif
1505
1506 static int snd_rawmidi_dev_register(struct snd_device *device)
1507 {
1508 int err;
1509 struct snd_info_entry *entry;
1510 char name[16];
1511 struct snd_rawmidi *rmidi = device->device_data;
1512
1513 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1514 return -ENOMEM;
1515 mutex_lock(&register_mutex);
1516 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1517 mutex_unlock(&register_mutex);
1518 return -EBUSY;
1519 }
1520 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1521 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1522 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1523 rmidi->card, rmidi->device,
1524 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1525 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1526 list_del(&rmidi->list);
1527 mutex_unlock(&register_mutex);
1528 return err;
1529 }
1530 if (rmidi->ops && rmidi->ops->dev_register &&
1531 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1532 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1533 list_del(&rmidi->list);
1534 mutex_unlock(&register_mutex);
1535 return err;
1536 }
1537 #ifdef CONFIG_SND_OSSEMUL
1538 rmidi->ossreg = 0;
1539 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1540 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1541 rmidi->card, 0, &snd_rawmidi_f_ops,
1542 rmidi, name) < 0) {
1543 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1544 } else {
1545 rmidi->ossreg++;
1546 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1547 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1548 #endif
1549 }
1550 }
1551 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1552 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1553 rmidi->card, 1, &snd_rawmidi_f_ops,
1554 rmidi, name) < 0) {
1555 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1556 } else {
1557 rmidi->ossreg++;
1558 }
1559 }
1560 #endif /* CONFIG_SND_OSSEMUL */
1561 mutex_unlock(&register_mutex);
1562 sprintf(name, "midi%d", rmidi->device);
1563 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1564 if (entry) {
1565 entry->private_data = rmidi;
1566 entry->c.text.read = snd_rawmidi_proc_info_read;
1567 if (snd_info_register(entry) < 0) {
1568 snd_info_free_entry(entry);
1569 entry = NULL;
1570 }
1571 }
1572 rmidi->proc_entry = entry;
1573 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1574 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1575 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1576 rmidi->seq_dev->private_data = rmidi;
1577 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1578 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1579 snd_device_register(rmidi->card, rmidi->seq_dev);
1580 }
1581 }
1582 #endif
1583 return 0;
1584 }
1585
1586 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1587 {
1588 struct snd_rawmidi *rmidi = device->device_data;
1589
1590 mutex_lock(&register_mutex);
1591 list_del_init(&rmidi->list);
1592 #ifdef CONFIG_SND_OSSEMUL
1593 if (rmidi->ossreg) {
1594 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1595 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1596 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1597 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1598 #endif
1599 }
1600 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1601 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1602 rmidi->ossreg = 0;
1603 }
1604 #endif /* CONFIG_SND_OSSEMUL */
1605 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1606 mutex_unlock(&register_mutex);
1607 return 0;
1608 }
1609
1610 /**
1611 * snd_rawmidi_set_ops - set the rawmidi operators
1612 * @rmidi: the rawmidi instance
1613 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1614 * @ops: the operator table
1615 *
1616 * Sets the rawmidi operators for the given stream direction.
1617 */
1618 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1619 struct snd_rawmidi_ops *ops)
1620 {
1621 struct snd_rawmidi_substream *substream;
1622
1623 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1624 substream->ops = ops;
1625 }
1626
1627 /*
1628 * ENTRY functions
1629 */
1630
1631 static int __init alsa_rawmidi_init(void)
1632 {
1633
1634 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1635 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1636 #ifdef CONFIG_SND_OSSEMUL
1637 { int i;
1638 /* check device map table */
1639 for (i = 0; i < SNDRV_CARDS; i++) {
1640 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1641 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1642 midi_map[i] = 0;
1643 }
1644 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1645 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1646 amidi_map[i] = 1;
1647 }
1648 }
1649 }
1650 #endif /* CONFIG_SND_OSSEMUL */
1651 return 0;
1652 }
1653
1654 static void __exit alsa_rawmidi_exit(void)
1655 {
1656 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1657 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1658 }
1659
1660 module_init(alsa_rawmidi_init)
1661 module_exit(alsa_rawmidi_exit)
1662
1663 EXPORT_SYMBOL(snd_rawmidi_output_params);
1664 EXPORT_SYMBOL(snd_rawmidi_input_params);
1665 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1666 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1667 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1668 EXPORT_SYMBOL(snd_rawmidi_receive);
1669 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1670 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1671 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1672 EXPORT_SYMBOL(snd_rawmidi_transmit);
1673 EXPORT_SYMBOL(snd_rawmidi_new);
1674 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1675 EXPORT_SYMBOL(snd_rawmidi_info_select);
1676 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1677 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1678 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1679 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
Stable & featurefull patchset based on Linus's git branch