xref: /openbmc/linux/sound/core/rawmidi.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
1 /*
2  *  Abstract layer for MIDI v1.0 stream
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21 
22 #include <sound/core.h>
23 #include <linux/major.h>
24 #include <linux/init.h>
25 #include <linux/sched.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/mutex.h>
30 #include <linux/moduleparam.h>
31 #include <linux/delay.h>
32 #include <sound/rawmidi.h>
33 #include <sound/info.h>
34 #include <sound/control.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40 MODULE_LICENSE("GPL");
41 
42 #ifdef CONFIG_SND_OSSEMUL
43 static int midi_map[SNDRV_CARDS];
44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45 module_param_array(midi_map, int, NULL, 0444);
46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47 module_param_array(amidi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49 #endif /* CONFIG_SND_OSSEMUL */
50 
51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52 static int snd_rawmidi_dev_free(struct snd_device *device);
53 static int snd_rawmidi_dev_register(struct snd_device *device);
54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55 
56 static LIST_HEAD(snd_rawmidi_devices);
57 static DEFINE_MUTEX(register_mutex);
58 
59 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
60 {
61 	struct snd_rawmidi *rawmidi;
62 
63 	list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
64 		if (rawmidi->card == card && rawmidi->device == device)
65 			return rawmidi;
66 	return NULL;
67 }
68 
69 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
70 {
71 	switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
72 	case FMODE_WRITE:
73 		return SNDRV_RAWMIDI_LFLG_OUTPUT;
74 	case FMODE_READ:
75 		return SNDRV_RAWMIDI_LFLG_INPUT;
76 	default:
77 		return SNDRV_RAWMIDI_LFLG_OPEN;
78 	}
79 }
80 
81 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
82 {
83 	struct snd_rawmidi_runtime *runtime = substream->runtime;
84 	return runtime->avail >= runtime->avail_min;
85 }
86 
87 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
88 					   size_t count)
89 {
90 	struct snd_rawmidi_runtime *runtime = substream->runtime;
91 	return runtime->avail >= runtime->avail_min &&
92 	       (!substream->append || runtime->avail >= count);
93 }
94 
95 static void snd_rawmidi_input_event_tasklet(unsigned long data)
96 {
97 	struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
98 	substream->runtime->event(substream);
99 }
100 
101 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
102 {
103 	struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
104 	substream->ops->trigger(substream, 1);
105 }
106 
107 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
108 {
109 	struct snd_rawmidi_runtime *runtime;
110 
111 	if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
112 		return -ENOMEM;
113 	spin_lock_init(&runtime->lock);
114 	init_waitqueue_head(&runtime->sleep);
115 	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
116 		tasklet_init(&runtime->tasklet,
117 			     snd_rawmidi_input_event_tasklet,
118 			     (unsigned long)substream);
119 	else
120 		tasklet_init(&runtime->tasklet,
121 			     snd_rawmidi_output_trigger_tasklet,
122 			     (unsigned long)substream);
123 	runtime->event = NULL;
124 	runtime->buffer_size = PAGE_SIZE;
125 	runtime->avail_min = 1;
126 	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
127 		runtime->avail = 0;
128 	else
129 		runtime->avail = runtime->buffer_size;
130 	if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
131 		kfree(runtime);
132 		return -ENOMEM;
133 	}
134 	runtime->appl_ptr = runtime->hw_ptr = 0;
135 	substream->runtime = runtime;
136 	return 0;
137 }
138 
139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
140 {
141 	struct snd_rawmidi_runtime *runtime = substream->runtime;
142 
143 	kfree(runtime->buffer);
144 	kfree(runtime);
145 	substream->runtime = NULL;
146 	return 0;
147 }
148 
149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
150 {
151 	if (!substream->opened)
152 		return;
153 	if (up) {
154 		tasklet_schedule(&substream->runtime->tasklet);
155 	} else {
156 		tasklet_kill(&substream->runtime->tasklet);
157 		substream->ops->trigger(substream, 0);
158 	}
159 }
160 
161 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
162 {
163 	if (!substream->opened)
164 		return;
165 	substream->ops->trigger(substream, up);
166 	if (!up && substream->runtime->event)
167 		tasklet_kill(&substream->runtime->tasklet);
168 }
169 
170 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
171 {
172 	unsigned long flags;
173 	struct snd_rawmidi_runtime *runtime = substream->runtime;
174 
175 	snd_rawmidi_output_trigger(substream, 0);
176 	runtime->drain = 0;
177 	spin_lock_irqsave(&runtime->lock, flags);
178 	runtime->appl_ptr = runtime->hw_ptr = 0;
179 	runtime->avail = runtime->buffer_size;
180 	spin_unlock_irqrestore(&runtime->lock, flags);
181 	return 0;
182 }
183 
184 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
185 {
186 	int err;
187 	long timeout;
188 	struct snd_rawmidi_runtime *runtime = substream->runtime;
189 
190 	err = 0;
191 	runtime->drain = 1;
192 	timeout = wait_event_interruptible_timeout(runtime->sleep,
193 				(runtime->avail >= runtime->buffer_size),
194 				10*HZ);
195 	if (signal_pending(current))
196 		err = -ERESTARTSYS;
197 	if (runtime->avail < runtime->buffer_size && !timeout) {
198 		snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
199 		err = -EIO;
200 	}
201 	runtime->drain = 0;
202 	if (err != -ERESTARTSYS) {
203 		/* we need wait a while to make sure that Tx FIFOs are empty */
204 		if (substream->ops->drain)
205 			substream->ops->drain(substream);
206 		else
207 			msleep(50);
208 		snd_rawmidi_drop_output(substream);
209 	}
210 	return err;
211 }
212 
213 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
214 {
215 	unsigned long flags;
216 	struct snd_rawmidi_runtime *runtime = substream->runtime;
217 
218 	snd_rawmidi_input_trigger(substream, 0);
219 	runtime->drain = 0;
220 	spin_lock_irqsave(&runtime->lock, flags);
221 	runtime->appl_ptr = runtime->hw_ptr = 0;
222 	runtime->avail = 0;
223 	spin_unlock_irqrestore(&runtime->lock, flags);
224 	return 0;
225 }
226 
227 /* look for an available substream for the given stream direction;
228  * if a specific subdevice is given, try to assign it
229  */
230 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
231 			    int stream, int mode,
232 			    struct snd_rawmidi_substream **sub_ret)
233 {
234 	struct snd_rawmidi_substream *substream;
235 	struct snd_rawmidi_str *s = &rmidi->streams[stream];
236 	static unsigned int info_flags[2] = {
237 		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
238 		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
239 	};
240 
241 	if (!(rmidi->info_flags & info_flags[stream]))
242 		return -ENXIO;
243 	if (subdevice >= 0 && subdevice >= s->substream_count)
244 		return -ENODEV;
245 
246 	list_for_each_entry(substream, &s->substreams, list) {
247 		if (substream->opened) {
248 			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
249 			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
250 			    !substream->append)
251 				continue;
252 		}
253 		if (subdevice < 0 || subdevice == substream->number) {
254 			*sub_ret = substream;
255 			return 0;
256 		}
257 	}
258 	return -EAGAIN;
259 }
260 
261 /* open and do ref-counting for the given substream */
262 static int open_substream(struct snd_rawmidi *rmidi,
263 			  struct snd_rawmidi_substream *substream,
264 			  int mode)
265 {
266 	int err;
267 
268 	if (substream->use_count == 0) {
269 		err = snd_rawmidi_runtime_create(substream);
270 		if (err < 0)
271 			return err;
272 		err = substream->ops->open(substream);
273 		if (err < 0) {
274 			snd_rawmidi_runtime_free(substream);
275 			return err;
276 		}
277 		substream->opened = 1;
278 		substream->active_sensing = 0;
279 		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
280 			substream->append = 1;
281 		substream->pid = get_pid(task_pid(current));
282 		rmidi->streams[substream->stream].substream_opened++;
283 	}
284 	substream->use_count++;
285 	return 0;
286 }
287 
288 static void close_substream(struct snd_rawmidi *rmidi,
289 			    struct snd_rawmidi_substream *substream,
290 			    int cleanup);
291 
292 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
293 			     struct snd_rawmidi_file *rfile)
294 {
295 	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
296 	int err;
297 
298 	rfile->input = rfile->output = NULL;
299 	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
300 		err = assign_substream(rmidi, subdevice,
301 				       SNDRV_RAWMIDI_STREAM_INPUT,
302 				       mode, &sinput);
303 		if (err < 0)
304 			return err;
305 	}
306 	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
307 		err = assign_substream(rmidi, subdevice,
308 				       SNDRV_RAWMIDI_STREAM_OUTPUT,
309 				       mode, &soutput);
310 		if (err < 0)
311 			return err;
312 	}
313 
314 	if (sinput) {
315 		err = open_substream(rmidi, sinput, mode);
316 		if (err < 0)
317 			return err;
318 	}
319 	if (soutput) {
320 		err = open_substream(rmidi, soutput, mode);
321 		if (err < 0) {
322 			if (sinput)
323 				close_substream(rmidi, sinput, 0);
324 			return err;
325 		}
326 	}
327 
328 	rfile->rmidi = rmidi;
329 	rfile->input = sinput;
330 	rfile->output = soutput;
331 	return 0;
332 }
333 
334 /* called from sound/core/seq/seq_midi.c */
335 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
336 			    int mode, struct snd_rawmidi_file * rfile)
337 {
338 	struct snd_rawmidi *rmidi;
339 	int err;
340 
341 	if (snd_BUG_ON(!rfile))
342 		return -EINVAL;
343 
344 	mutex_lock(&register_mutex);
345 	rmidi = snd_rawmidi_search(card, device);
346 	if (rmidi == NULL) {
347 		mutex_unlock(&register_mutex);
348 		return -ENODEV;
349 	}
350 	if (!try_module_get(rmidi->card->module)) {
351 		mutex_unlock(&register_mutex);
352 		return -ENXIO;
353 	}
354 	mutex_unlock(&register_mutex);
355 
356 	mutex_lock(&rmidi->open_mutex);
357 	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
358 	mutex_unlock(&rmidi->open_mutex);
359 	if (err < 0)
360 		module_put(rmidi->card->module);
361 	return err;
362 }
363 
364 static int snd_rawmidi_open(struct inode *inode, struct file *file)
365 {
366 	int maj = imajor(inode);
367 	struct snd_card *card;
368 	int subdevice;
369 	unsigned short fflags;
370 	int err;
371 	struct snd_rawmidi *rmidi;
372 	struct snd_rawmidi_file *rawmidi_file = NULL;
373 	wait_queue_t wait;
374 	struct snd_ctl_file *kctl;
375 
376 	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
377 		return -EINVAL;		/* invalid combination */
378 
379 	if (maj == snd_major) {
380 		rmidi = snd_lookup_minor_data(iminor(inode),
381 					      SNDRV_DEVICE_TYPE_RAWMIDI);
382 #ifdef CONFIG_SND_OSSEMUL
383 	} else if (maj == SOUND_MAJOR) {
384 		rmidi = snd_lookup_oss_minor_data(iminor(inode),
385 						  SNDRV_OSS_DEVICE_TYPE_MIDI);
386 #endif
387 	} else
388 		return -ENXIO;
389 
390 	if (rmidi == NULL)
391 		return -ENODEV;
392 
393 	if (!try_module_get(rmidi->card->module))
394 		return -ENXIO;
395 
396 	mutex_lock(&rmidi->open_mutex);
397 	card = rmidi->card;
398 	err = snd_card_file_add(card, file);
399 	if (err < 0)
400 		goto __error_card;
401 	fflags = snd_rawmidi_file_flags(file);
402 	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
403 		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
404 	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
405 	if (rawmidi_file == NULL) {
406 		err = -ENOMEM;
407 		goto __error;
408 	}
409 	init_waitqueue_entry(&wait, current);
410 	add_wait_queue(&rmidi->open_wait, &wait);
411 	while (1) {
412 		subdevice = -1;
413 		read_lock(&card->ctl_files_rwlock);
414 		list_for_each_entry(kctl, &card->ctl_files, list) {
415 			if (kctl->pid == task_pid(current)) {
416 				subdevice = kctl->prefer_rawmidi_subdevice;
417 				if (subdevice != -1)
418 					break;
419 			}
420 		}
421 		read_unlock(&card->ctl_files_rwlock);
422 		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
423 		if (err >= 0)
424 			break;
425 		if (err == -EAGAIN) {
426 			if (file->f_flags & O_NONBLOCK) {
427 				err = -EBUSY;
428 				break;
429 			}
430 		} else
431 			break;
432 		set_current_state(TASK_INTERRUPTIBLE);
433 		mutex_unlock(&rmidi->open_mutex);
434 		schedule();
435 		mutex_lock(&rmidi->open_mutex);
436 		if (signal_pending(current)) {
437 			err = -ERESTARTSYS;
438 			break;
439 		}
440 	}
441 	remove_wait_queue(&rmidi->open_wait, &wait);
442 	if (err < 0) {
443 		kfree(rawmidi_file);
444 		goto __error;
445 	}
446 #ifdef CONFIG_SND_OSSEMUL
447 	if (rawmidi_file->input && rawmidi_file->input->runtime)
448 		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
449 	if (rawmidi_file->output && rawmidi_file->output->runtime)
450 		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
451 #endif
452 	file->private_data = rawmidi_file;
453 	mutex_unlock(&rmidi->open_mutex);
454 	return 0;
455 
456  __error:
457 	snd_card_file_remove(card, file);
458  __error_card:
459 	mutex_unlock(&rmidi->open_mutex);
460 	module_put(rmidi->card->module);
461 	return err;
462 }
463 
464 static void close_substream(struct snd_rawmidi *rmidi,
465 			    struct snd_rawmidi_substream *substream,
466 			    int cleanup)
467 {
468 	if (--substream->use_count)
469 		return;
470 
471 	if (cleanup) {
472 		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
473 			snd_rawmidi_input_trigger(substream, 0);
474 		else {
475 			if (substream->active_sensing) {
476 				unsigned char buf = 0xfe;
477 				/* sending single active sensing message
478 				 * to shut the device up
479 				 */
480 				snd_rawmidi_kernel_write(substream, &buf, 1);
481 			}
482 			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
483 				snd_rawmidi_output_trigger(substream, 0);
484 		}
485 	}
486 	substream->ops->close(substream);
487 	if (substream->runtime->private_free)
488 		substream->runtime->private_free(substream);
489 	snd_rawmidi_runtime_free(substream);
490 	substream->opened = 0;
491 	substream->append = 0;
492 	put_pid(substream->pid);
493 	substream->pid = NULL;
494 	rmidi->streams[substream->stream].substream_opened--;
495 }
496 
497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
498 {
499 	struct snd_rawmidi *rmidi;
500 
501 	rmidi = rfile->rmidi;
502 	mutex_lock(&rmidi->open_mutex);
503 	if (rfile->input) {
504 		close_substream(rmidi, rfile->input, 1);
505 		rfile->input = NULL;
506 	}
507 	if (rfile->output) {
508 		close_substream(rmidi, rfile->output, 1);
509 		rfile->output = NULL;
510 	}
511 	rfile->rmidi = NULL;
512 	mutex_unlock(&rmidi->open_mutex);
513 	wake_up(&rmidi->open_wait);
514 }
515 
516 /* called from sound/core/seq/seq_midi.c */
517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
518 {
519 	struct snd_rawmidi *rmidi;
520 
521 	if (snd_BUG_ON(!rfile))
522 		return -ENXIO;
523 
524 	rmidi = rfile->rmidi;
525 	rawmidi_release_priv(rfile);
526 	module_put(rmidi->card->module);
527 	return 0;
528 }
529 
530 static int snd_rawmidi_release(struct inode *inode, struct file *file)
531 {
532 	struct snd_rawmidi_file *rfile;
533 	struct snd_rawmidi *rmidi;
534 
535 	rfile = file->private_data;
536 	rmidi = rfile->rmidi;
537 	rawmidi_release_priv(rfile);
538 	kfree(rfile);
539 	snd_card_file_remove(rmidi->card, file);
540 	module_put(rmidi->card->module);
541 	return 0;
542 }
543 
544 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
545 			    struct snd_rawmidi_info *info)
546 {
547 	struct snd_rawmidi *rmidi;
548 
549 	if (substream == NULL)
550 		return -ENODEV;
551 	rmidi = substream->rmidi;
552 	memset(info, 0, sizeof(*info));
553 	info->card = rmidi->card->number;
554 	info->device = rmidi->device;
555 	info->subdevice = substream->number;
556 	info->stream = substream->stream;
557 	info->flags = rmidi->info_flags;
558 	strcpy(info->id, rmidi->id);
559 	strcpy(info->name, rmidi->name);
560 	strcpy(info->subname, substream->name);
561 	info->subdevices_count = substream->pstr->substream_count;
562 	info->subdevices_avail = (substream->pstr->substream_count -
563 				  substream->pstr->substream_opened);
564 	return 0;
565 }
566 
567 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
568 				 struct snd_rawmidi_info __user * _info)
569 {
570 	struct snd_rawmidi_info info;
571 	int err;
572 	if ((err = snd_rawmidi_info(substream, &info)) < 0)
573 		return err;
574 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
575 		return -EFAULT;
576 	return 0;
577 }
578 
579 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
580 {
581 	struct snd_rawmidi *rmidi;
582 	struct snd_rawmidi_str *pstr;
583 	struct snd_rawmidi_substream *substream;
584 
585 	mutex_lock(&register_mutex);
586 	rmidi = snd_rawmidi_search(card, info->device);
587 	mutex_unlock(&register_mutex);
588 	if (!rmidi)
589 		return -ENXIO;
590 	if (info->stream < 0 || info->stream > 1)
591 		return -EINVAL;
592 	pstr = &rmidi->streams[info->stream];
593 	if (pstr->substream_count == 0)
594 		return -ENOENT;
595 	if (info->subdevice >= pstr->substream_count)
596 		return -ENXIO;
597 	list_for_each_entry(substream, &pstr->substreams, list) {
598 		if ((unsigned int)substream->number == info->subdevice)
599 			return snd_rawmidi_info(substream, info);
600 	}
601 	return -ENXIO;
602 }
603 
604 static int snd_rawmidi_info_select_user(struct snd_card *card,
605 					struct snd_rawmidi_info __user *_info)
606 {
607 	int err;
608 	struct snd_rawmidi_info info;
609 	if (get_user(info.device, &_info->device))
610 		return -EFAULT;
611 	if (get_user(info.stream, &_info->stream))
612 		return -EFAULT;
613 	if (get_user(info.subdevice, &_info->subdevice))
614 		return -EFAULT;
615 	if ((err = snd_rawmidi_info_select(card, &info)) < 0)
616 		return err;
617 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
618 		return -EFAULT;
619 	return 0;
620 }
621 
622 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
623 			      struct snd_rawmidi_params * params)
624 {
625 	char *newbuf;
626 	struct snd_rawmidi_runtime *runtime = substream->runtime;
627 
628 	if (substream->append && substream->use_count > 1)
629 		return -EBUSY;
630 	snd_rawmidi_drain_output(substream);
631 	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
632 		return -EINVAL;
633 	}
634 	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
635 		return -EINVAL;
636 	}
637 	if (params->buffer_size != runtime->buffer_size) {
638 		newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
639 		if (!newbuf)
640 			return -ENOMEM;
641 		kfree(runtime->buffer);
642 		runtime->buffer = newbuf;
643 		runtime->buffer_size = params->buffer_size;
644 		runtime->avail = runtime->buffer_size;
645 	}
646 	runtime->avail_min = params->avail_min;
647 	substream->active_sensing = !params->no_active_sensing;
648 	return 0;
649 }
650 
651 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
652 			     struct snd_rawmidi_params * params)
653 {
654 	char *newbuf;
655 	struct snd_rawmidi_runtime *runtime = substream->runtime;
656 
657 	snd_rawmidi_drain_input(substream);
658 	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
659 		return -EINVAL;
660 	}
661 	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
662 		return -EINVAL;
663 	}
664 	if (params->buffer_size != runtime->buffer_size) {
665 		newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
666 		if (!newbuf)
667 			return -ENOMEM;
668 		kfree(runtime->buffer);
669 		runtime->buffer = newbuf;
670 		runtime->buffer_size = params->buffer_size;
671 	}
672 	runtime->avail_min = params->avail_min;
673 	return 0;
674 }
675 
676 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
677 				     struct snd_rawmidi_status * status)
678 {
679 	struct snd_rawmidi_runtime *runtime = substream->runtime;
680 
681 	memset(status, 0, sizeof(*status));
682 	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
683 	spin_lock_irq(&runtime->lock);
684 	status->avail = runtime->avail;
685 	spin_unlock_irq(&runtime->lock);
686 	return 0;
687 }
688 
689 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
690 				    struct snd_rawmidi_status * status)
691 {
692 	struct snd_rawmidi_runtime *runtime = substream->runtime;
693 
694 	memset(status, 0, sizeof(*status));
695 	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
696 	spin_lock_irq(&runtime->lock);
697 	status->avail = runtime->avail;
698 	status->xruns = runtime->xruns;
699 	runtime->xruns = 0;
700 	spin_unlock_irq(&runtime->lock);
701 	return 0;
702 }
703 
704 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
705 {
706 	struct snd_rawmidi_file *rfile;
707 	void __user *argp = (void __user *)arg;
708 
709 	rfile = file->private_data;
710 	if (((cmd >> 8) & 0xff) != 'W')
711 		return -ENOTTY;
712 	switch (cmd) {
713 	case SNDRV_RAWMIDI_IOCTL_PVERSION:
714 		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
715 	case SNDRV_RAWMIDI_IOCTL_INFO:
716 	{
717 		int stream;
718 		struct snd_rawmidi_info __user *info = argp;
719 		if (get_user(stream, &info->stream))
720 			return -EFAULT;
721 		switch (stream) {
722 		case SNDRV_RAWMIDI_STREAM_INPUT:
723 			return snd_rawmidi_info_user(rfile->input, info);
724 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
725 			return snd_rawmidi_info_user(rfile->output, info);
726 		default:
727 			return -EINVAL;
728 		}
729 	}
730 	case SNDRV_RAWMIDI_IOCTL_PARAMS:
731 	{
732 		struct snd_rawmidi_params params;
733 		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
734 			return -EFAULT;
735 		switch (params.stream) {
736 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
737 			if (rfile->output == NULL)
738 				return -EINVAL;
739 			return snd_rawmidi_output_params(rfile->output, &params);
740 		case SNDRV_RAWMIDI_STREAM_INPUT:
741 			if (rfile->input == NULL)
742 				return -EINVAL;
743 			return snd_rawmidi_input_params(rfile->input, &params);
744 		default:
745 			return -EINVAL;
746 		}
747 	}
748 	case SNDRV_RAWMIDI_IOCTL_STATUS:
749 	{
750 		int err = 0;
751 		struct snd_rawmidi_status status;
752 		if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
753 			return -EFAULT;
754 		switch (status.stream) {
755 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
756 			if (rfile->output == NULL)
757 				return -EINVAL;
758 			err = snd_rawmidi_output_status(rfile->output, &status);
759 			break;
760 		case SNDRV_RAWMIDI_STREAM_INPUT:
761 			if (rfile->input == NULL)
762 				return -EINVAL;
763 			err = snd_rawmidi_input_status(rfile->input, &status);
764 			break;
765 		default:
766 			return -EINVAL;
767 		}
768 		if (err < 0)
769 			return err;
770 		if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
771 			return -EFAULT;
772 		return 0;
773 	}
774 	case SNDRV_RAWMIDI_IOCTL_DROP:
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_drop_output(rfile->output);
784 		default:
785 			return -EINVAL;
786 		}
787 	}
788 	case SNDRV_RAWMIDI_IOCTL_DRAIN:
789 	{
790 		int val;
791 		if (get_user(val, (int __user *) argp))
792 			return -EFAULT;
793 		switch (val) {
794 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
795 			if (rfile->output == NULL)
796 				return -EINVAL;
797 			return snd_rawmidi_drain_output(rfile->output);
798 		case SNDRV_RAWMIDI_STREAM_INPUT:
799 			if (rfile->input == NULL)
800 				return -EINVAL;
801 			return snd_rawmidi_drain_input(rfile->input);
802 		default:
803 			return -EINVAL;
804 		}
805 	}
806 #ifdef CONFIG_SND_DEBUG
807 	default:
808 		snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
809 #endif
810 	}
811 	return -ENOTTY;
812 }
813 
814 static int snd_rawmidi_control_ioctl(struct snd_card *card,
815 				     struct snd_ctl_file *control,
816 				     unsigned int cmd,
817 				     unsigned long arg)
818 {
819 	void __user *argp = (void __user *)arg;
820 
821 	switch (cmd) {
822 	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
823 	{
824 		int device;
825 
826 		if (get_user(device, (int __user *)argp))
827 			return -EFAULT;
828 		mutex_lock(&register_mutex);
829 		device = device < 0 ? 0 : device + 1;
830 		while (device < SNDRV_RAWMIDI_DEVICES) {
831 			if (snd_rawmidi_search(card, device))
832 				break;
833 			device++;
834 		}
835 		if (device == SNDRV_RAWMIDI_DEVICES)
836 			device = -1;
837 		mutex_unlock(&register_mutex);
838 		if (put_user(device, (int __user *)argp))
839 			return -EFAULT;
840 		return 0;
841 	}
842 	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
843 	{
844 		int val;
845 
846 		if (get_user(val, (int __user *)argp))
847 			return -EFAULT;
848 		control->prefer_rawmidi_subdevice = val;
849 		return 0;
850 	}
851 	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
852 		return snd_rawmidi_info_select_user(card, argp);
853 	}
854 	return -ENOIOCTLCMD;
855 }
856 
857 /**
858  * snd_rawmidi_receive - receive the input data from the device
859  * @substream: the rawmidi substream
860  * @buffer: the buffer pointer
861  * @count: the data size to read
862  *
863  * Reads the data from the internal buffer.
864  *
865  * Returns the size of read data, or a negative error code on failure.
866  */
867 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
868 			const unsigned char *buffer, int count)
869 {
870 	unsigned long flags;
871 	int result = 0, count1;
872 	struct snd_rawmidi_runtime *runtime = substream->runtime;
873 
874 	if (!substream->opened)
875 		return -EBADFD;
876 	if (runtime->buffer == NULL) {
877 		snd_printd("snd_rawmidi_receive: input is not active!!!\n");
878 		return -EINVAL;
879 	}
880 	spin_lock_irqsave(&runtime->lock, flags);
881 	if (count == 1) {	/* special case, faster code */
882 		substream->bytes++;
883 		if (runtime->avail < runtime->buffer_size) {
884 			runtime->buffer[runtime->hw_ptr++] = buffer[0];
885 			runtime->hw_ptr %= runtime->buffer_size;
886 			runtime->avail++;
887 			result++;
888 		} else {
889 			runtime->xruns++;
890 		}
891 	} else {
892 		substream->bytes += count;
893 		count1 = runtime->buffer_size - runtime->hw_ptr;
894 		if (count1 > count)
895 			count1 = count;
896 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
897 			count1 = runtime->buffer_size - runtime->avail;
898 		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
899 		runtime->hw_ptr += count1;
900 		runtime->hw_ptr %= runtime->buffer_size;
901 		runtime->avail += count1;
902 		count -= count1;
903 		result += count1;
904 		if (count > 0) {
905 			buffer += count1;
906 			count1 = count;
907 			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
908 				count1 = runtime->buffer_size - runtime->avail;
909 				runtime->xruns += count - count1;
910 			}
911 			if (count1 > 0) {
912 				memcpy(runtime->buffer, buffer, count1);
913 				runtime->hw_ptr = count1;
914 				runtime->avail += count1;
915 				result += count1;
916 			}
917 		}
918 	}
919 	if (result > 0) {
920 		if (runtime->event)
921 			tasklet_schedule(&runtime->tasklet);
922 		else if (snd_rawmidi_ready(substream))
923 			wake_up(&runtime->sleep);
924 	}
925 	spin_unlock_irqrestore(&runtime->lock, flags);
926 	return result;
927 }
928 
929 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
930 				     unsigned char __user *userbuf,
931 				     unsigned char *kernelbuf, long count)
932 {
933 	unsigned long flags;
934 	long result = 0, count1;
935 	struct snd_rawmidi_runtime *runtime = substream->runtime;
936 
937 	while (count > 0 && runtime->avail) {
938 		count1 = runtime->buffer_size - runtime->appl_ptr;
939 		if (count1 > count)
940 			count1 = count;
941 		spin_lock_irqsave(&runtime->lock, flags);
942 		if (count1 > (int)runtime->avail)
943 			count1 = runtime->avail;
944 		if (kernelbuf)
945 			memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
946 		if (userbuf) {
947 			spin_unlock_irqrestore(&runtime->lock, flags);
948 			if (copy_to_user(userbuf + result,
949 					 runtime->buffer + runtime->appl_ptr, count1)) {
950 				return result > 0 ? result : -EFAULT;
951 			}
952 			spin_lock_irqsave(&runtime->lock, flags);
953 		}
954 		runtime->appl_ptr += count1;
955 		runtime->appl_ptr %= runtime->buffer_size;
956 		runtime->avail -= count1;
957 		spin_unlock_irqrestore(&runtime->lock, flags);
958 		result += count1;
959 		count -= count1;
960 	}
961 	return result;
962 }
963 
964 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
965 			     unsigned char *buf, long count)
966 {
967 	snd_rawmidi_input_trigger(substream, 1);
968 	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
969 }
970 
971 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
972 				loff_t *offset)
973 {
974 	long result;
975 	int count1;
976 	struct snd_rawmidi_file *rfile;
977 	struct snd_rawmidi_substream *substream;
978 	struct snd_rawmidi_runtime *runtime;
979 
980 	rfile = file->private_data;
981 	substream = rfile->input;
982 	if (substream == NULL)
983 		return -EIO;
984 	runtime = substream->runtime;
985 	snd_rawmidi_input_trigger(substream, 1);
986 	result = 0;
987 	while (count > 0) {
988 		spin_lock_irq(&runtime->lock);
989 		while (!snd_rawmidi_ready(substream)) {
990 			wait_queue_t wait;
991 			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
992 				spin_unlock_irq(&runtime->lock);
993 				return result > 0 ? result : -EAGAIN;
994 			}
995 			init_waitqueue_entry(&wait, current);
996 			add_wait_queue(&runtime->sleep, &wait);
997 			set_current_state(TASK_INTERRUPTIBLE);
998 			spin_unlock_irq(&runtime->lock);
999 			schedule();
1000 			remove_wait_queue(&runtime->sleep, &wait);
1001 			if (signal_pending(current))
1002 				return result > 0 ? result : -ERESTARTSYS;
1003 			if (!runtime->avail)
1004 				return result > 0 ? result : -EIO;
1005 			spin_lock_irq(&runtime->lock);
1006 		}
1007 		spin_unlock_irq(&runtime->lock);
1008 		count1 = snd_rawmidi_kernel_read1(substream,
1009 						  (unsigned char __user *)buf,
1010 						  NULL/*kernelbuf*/,
1011 						  count);
1012 		if (count1 < 0)
1013 			return result > 0 ? result : count1;
1014 		result += count1;
1015 		buf += count1;
1016 		count -= count1;
1017 	}
1018 	return result;
1019 }
1020 
1021 /**
1022  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1023  * @substream: the rawmidi substream
1024  *
1025  * Returns 1 if the internal output buffer is empty, 0 if not.
1026  */
1027 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1028 {
1029 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1030 	int result;
1031 	unsigned long flags;
1032 
1033 	if (runtime->buffer == NULL) {
1034 		snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1035 		return 1;
1036 	}
1037 	spin_lock_irqsave(&runtime->lock, flags);
1038 	result = runtime->avail >= runtime->buffer_size;
1039 	spin_unlock_irqrestore(&runtime->lock, flags);
1040 	return result;
1041 }
1042 
1043 /**
1044  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1045  * @substream: the rawmidi substream
1046  * @buffer: the buffer pointer
1047  * @count: data size to transfer
1048  *
1049  * Copies data from the internal output buffer to the given buffer.
1050  *
1051  * Call this in the interrupt handler when the midi output is ready,
1052  * and call snd_rawmidi_transmit_ack() after the transmission is
1053  * finished.
1054  *
1055  * Returns the size of copied data, or a negative error code on failure.
1056  */
1057 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1058 			      unsigned char *buffer, int count)
1059 {
1060 	unsigned long flags;
1061 	int result, count1;
1062 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1063 
1064 	if (runtime->buffer == NULL) {
1065 		snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1066 		return -EINVAL;
1067 	}
1068 	result = 0;
1069 	spin_lock_irqsave(&runtime->lock, flags);
1070 	if (runtime->avail >= runtime->buffer_size) {
1071 		/* warning: lowlevel layer MUST trigger down the hardware */
1072 		goto __skip;
1073 	}
1074 	if (count == 1) {	/* special case, faster code */
1075 		*buffer = runtime->buffer[runtime->hw_ptr];
1076 		result++;
1077 	} else {
1078 		count1 = runtime->buffer_size - runtime->hw_ptr;
1079 		if (count1 > count)
1080 			count1 = count;
1081 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1082 			count1 = runtime->buffer_size - runtime->avail;
1083 		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1084 		count -= count1;
1085 		result += count1;
1086 		if (count > 0) {
1087 			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1088 				count = runtime->buffer_size - runtime->avail - count1;
1089 			memcpy(buffer + count1, runtime->buffer, count);
1090 			result += count;
1091 		}
1092 	}
1093       __skip:
1094 	spin_unlock_irqrestore(&runtime->lock, flags);
1095 	return result;
1096 }
1097 
1098 /**
1099  * snd_rawmidi_transmit_ack - acknowledge the transmission
1100  * @substream: the rawmidi substream
1101  * @count: the tranferred count
1102  *
1103  * Advances the hardware pointer for the internal output buffer with
1104  * the given size and updates the condition.
1105  * Call after the transmission is finished.
1106  *
1107  * Returns the advanced size if successful, or a negative error code on failure.
1108  */
1109 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1110 {
1111 	unsigned long flags;
1112 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1113 
1114 	if (runtime->buffer == NULL) {
1115 		snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1116 		return -EINVAL;
1117 	}
1118 	spin_lock_irqsave(&runtime->lock, flags);
1119 	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1120 	runtime->hw_ptr += count;
1121 	runtime->hw_ptr %= runtime->buffer_size;
1122 	runtime->avail += count;
1123 	substream->bytes += count;
1124 	if (count > 0) {
1125 		if (runtime->drain || snd_rawmidi_ready(substream))
1126 			wake_up(&runtime->sleep);
1127 	}
1128 	spin_unlock_irqrestore(&runtime->lock, flags);
1129 	return count;
1130 }
1131 
1132 /**
1133  * snd_rawmidi_transmit - copy from the buffer to the device
1134  * @substream: the rawmidi substream
1135  * @buffer: the buffer pointer
1136  * @count: the data size to transfer
1137  *
1138  * Copies data from the buffer to the device and advances the pointer.
1139  *
1140  * Returns the copied size if successful, or a negative error code on failure.
1141  */
1142 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1143 			 unsigned char *buffer, int count)
1144 {
1145 	if (!substream->opened)
1146 		return -EBADFD;
1147 	count = snd_rawmidi_transmit_peek(substream, buffer, count);
1148 	if (count < 0)
1149 		return count;
1150 	return snd_rawmidi_transmit_ack(substream, count);
1151 }
1152 
1153 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1154 				      const unsigned char __user *userbuf,
1155 				      const unsigned char *kernelbuf,
1156 				      long count)
1157 {
1158 	unsigned long flags;
1159 	long count1, result;
1160 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1161 
1162 	if (snd_BUG_ON(!kernelbuf && !userbuf))
1163 		return -EINVAL;
1164 	if (snd_BUG_ON(!runtime->buffer))
1165 		return -EINVAL;
1166 
1167 	result = 0;
1168 	spin_lock_irqsave(&runtime->lock, flags);
1169 	if (substream->append) {
1170 		if ((long)runtime->avail < count) {
1171 			spin_unlock_irqrestore(&runtime->lock, flags);
1172 			return -EAGAIN;
1173 		}
1174 	}
1175 	while (count > 0 && runtime->avail > 0) {
1176 		count1 = runtime->buffer_size - runtime->appl_ptr;
1177 		if (count1 > count)
1178 			count1 = count;
1179 		if (count1 > (long)runtime->avail)
1180 			count1 = runtime->avail;
1181 		if (kernelbuf)
1182 			memcpy(runtime->buffer + runtime->appl_ptr,
1183 			       kernelbuf + result, count1);
1184 		else if (userbuf) {
1185 			spin_unlock_irqrestore(&runtime->lock, flags);
1186 			if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1187 					   userbuf + result, count1)) {
1188 				spin_lock_irqsave(&runtime->lock, flags);
1189 				result = result > 0 ? result : -EFAULT;
1190 				goto __end;
1191 			}
1192 			spin_lock_irqsave(&runtime->lock, flags);
1193 		}
1194 		runtime->appl_ptr += count1;
1195 		runtime->appl_ptr %= runtime->buffer_size;
1196 		runtime->avail -= count1;
1197 		result += count1;
1198 		count -= count1;
1199 	}
1200       __end:
1201 	count1 = runtime->avail < runtime->buffer_size;
1202 	spin_unlock_irqrestore(&runtime->lock, flags);
1203 	if (count1)
1204 		snd_rawmidi_output_trigger(substream, 1);
1205 	return result;
1206 }
1207 
1208 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1209 			      const unsigned char *buf, long count)
1210 {
1211 	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1212 }
1213 
1214 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1215 				 size_t count, loff_t *offset)
1216 {
1217 	long result, timeout;
1218 	int count1;
1219 	struct snd_rawmidi_file *rfile;
1220 	struct snd_rawmidi_runtime *runtime;
1221 	struct snd_rawmidi_substream *substream;
1222 
1223 	rfile = file->private_data;
1224 	substream = rfile->output;
1225 	runtime = substream->runtime;
1226 	/* we cannot put an atomic message to our buffer */
1227 	if (substream->append && count > runtime->buffer_size)
1228 		return -EIO;
1229 	result = 0;
1230 	while (count > 0) {
1231 		spin_lock_irq(&runtime->lock);
1232 		while (!snd_rawmidi_ready_append(substream, count)) {
1233 			wait_queue_t wait;
1234 			if (file->f_flags & O_NONBLOCK) {
1235 				spin_unlock_irq(&runtime->lock);
1236 				return result > 0 ? result : -EAGAIN;
1237 			}
1238 			init_waitqueue_entry(&wait, current);
1239 			add_wait_queue(&runtime->sleep, &wait);
1240 			set_current_state(TASK_INTERRUPTIBLE);
1241 			spin_unlock_irq(&runtime->lock);
1242 			timeout = schedule_timeout(30 * HZ);
1243 			remove_wait_queue(&runtime->sleep, &wait);
1244 			if (signal_pending(current))
1245 				return result > 0 ? result : -ERESTARTSYS;
1246 			if (!runtime->avail && !timeout)
1247 				return result > 0 ? result : -EIO;
1248 			spin_lock_irq(&runtime->lock);
1249 		}
1250 		spin_unlock_irq(&runtime->lock);
1251 		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1252 		if (count1 < 0)
1253 			return result > 0 ? result : count1;
1254 		result += count1;
1255 		buf += count1;
1256 		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1257 			break;
1258 		count -= count1;
1259 	}
1260 	if (file->f_flags & O_DSYNC) {
1261 		spin_lock_irq(&runtime->lock);
1262 		while (runtime->avail != runtime->buffer_size) {
1263 			wait_queue_t wait;
1264 			unsigned int last_avail = runtime->avail;
1265 			init_waitqueue_entry(&wait, current);
1266 			add_wait_queue(&runtime->sleep, &wait);
1267 			set_current_state(TASK_INTERRUPTIBLE);
1268 			spin_unlock_irq(&runtime->lock);
1269 			timeout = schedule_timeout(30 * HZ);
1270 			remove_wait_queue(&runtime->sleep, &wait);
1271 			if (signal_pending(current))
1272 				return result > 0 ? result : -ERESTARTSYS;
1273 			if (runtime->avail == last_avail && !timeout)
1274 				return result > 0 ? result : -EIO;
1275 			spin_lock_irq(&runtime->lock);
1276 		}
1277 		spin_unlock_irq(&runtime->lock);
1278 	}
1279 	return result;
1280 }
1281 
1282 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1283 {
1284 	struct snd_rawmidi_file *rfile;
1285 	struct snd_rawmidi_runtime *runtime;
1286 	unsigned int mask;
1287 
1288 	rfile = file->private_data;
1289 	if (rfile->input != NULL) {
1290 		runtime = rfile->input->runtime;
1291 		snd_rawmidi_input_trigger(rfile->input, 1);
1292 		poll_wait(file, &runtime->sleep, wait);
1293 	}
1294 	if (rfile->output != NULL) {
1295 		runtime = rfile->output->runtime;
1296 		poll_wait(file, &runtime->sleep, wait);
1297 	}
1298 	mask = 0;
1299 	if (rfile->input != NULL) {
1300 		if (snd_rawmidi_ready(rfile->input))
1301 			mask |= POLLIN | POLLRDNORM;
1302 	}
1303 	if (rfile->output != NULL) {
1304 		if (snd_rawmidi_ready(rfile->output))
1305 			mask |= POLLOUT | POLLWRNORM;
1306 	}
1307 	return mask;
1308 }
1309 
1310 /*
1311  */
1312 #ifdef CONFIG_COMPAT
1313 #include "rawmidi_compat.c"
1314 #else
1315 #define snd_rawmidi_ioctl_compat	NULL
1316 #endif
1317 
1318 /*
1319 
1320  */
1321 
1322 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1323 				       struct snd_info_buffer *buffer)
1324 {
1325 	struct snd_rawmidi *rmidi;
1326 	struct snd_rawmidi_substream *substream;
1327 	struct snd_rawmidi_runtime *runtime;
1328 
1329 	rmidi = entry->private_data;
1330 	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1331 	mutex_lock(&rmidi->open_mutex);
1332 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1333 		list_for_each_entry(substream,
1334 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1335 				    list) {
1336 			snd_iprintf(buffer,
1337 				    "Output %d\n"
1338 				    "  Tx bytes     : %lu\n",
1339 				    substream->number,
1340 				    (unsigned long) substream->bytes);
1341 			if (substream->opened) {
1342 				snd_iprintf(buffer,
1343 				    "  Owner PID    : %d\n",
1344 				    pid_vnr(substream->pid));
1345 				runtime = substream->runtime;
1346 				snd_iprintf(buffer,
1347 				    "  Mode         : %s\n"
1348 				    "  Buffer size  : %lu\n"
1349 				    "  Avail        : %lu\n",
1350 				    runtime->oss ? "OSS compatible" : "native",
1351 				    (unsigned long) runtime->buffer_size,
1352 				    (unsigned long) runtime->avail);
1353 			}
1354 		}
1355 	}
1356 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1357 		list_for_each_entry(substream,
1358 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1359 				    list) {
1360 			snd_iprintf(buffer,
1361 				    "Input %d\n"
1362 				    "  Rx bytes     : %lu\n",
1363 				    substream->number,
1364 				    (unsigned long) substream->bytes);
1365 			if (substream->opened) {
1366 				snd_iprintf(buffer,
1367 					    "  Owner PID    : %d\n",
1368 					    pid_vnr(substream->pid));
1369 				runtime = substream->runtime;
1370 				snd_iprintf(buffer,
1371 					    "  Buffer size  : %lu\n"
1372 					    "  Avail        : %lu\n"
1373 					    "  Overruns     : %lu\n",
1374 					    (unsigned long) runtime->buffer_size,
1375 					    (unsigned long) runtime->avail,
1376 					    (unsigned long) runtime->xruns);
1377 			}
1378 		}
1379 	}
1380 	mutex_unlock(&rmidi->open_mutex);
1381 }
1382 
1383 /*
1384  *  Register functions
1385  */
1386 
1387 static const struct file_operations snd_rawmidi_f_ops =
1388 {
1389 	.owner =	THIS_MODULE,
1390 	.read =		snd_rawmidi_read,
1391 	.write =	snd_rawmidi_write,
1392 	.open =		snd_rawmidi_open,
1393 	.release =	snd_rawmidi_release,
1394 	.poll =		snd_rawmidi_poll,
1395 	.unlocked_ioctl =	snd_rawmidi_ioctl,
1396 	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1397 };
1398 
1399 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1400 					struct snd_rawmidi_str *stream,
1401 					int direction,
1402 					int count)
1403 {
1404 	struct snd_rawmidi_substream *substream;
1405 	int idx;
1406 
1407 	for (idx = 0; idx < count; idx++) {
1408 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1409 		if (substream == NULL) {
1410 			snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1411 			return -ENOMEM;
1412 		}
1413 		substream->stream = direction;
1414 		substream->number = idx;
1415 		substream->rmidi = rmidi;
1416 		substream->pstr = stream;
1417 		list_add_tail(&substream->list, &stream->substreams);
1418 		stream->substream_count++;
1419 	}
1420 	return 0;
1421 }
1422 
1423 /**
1424  * snd_rawmidi_new - create a rawmidi instance
1425  * @card: the card instance
1426  * @id: the id string
1427  * @device: the device index
1428  * @output_count: the number of output streams
1429  * @input_count: the number of input streams
1430  * @rrawmidi: the pointer to store the new rawmidi instance
1431  *
1432  * Creates a new rawmidi instance.
1433  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1434  *
1435  * Returns zero if successful, or a negative error code on failure.
1436  */
1437 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1438 		    int output_count, int input_count,
1439 		    struct snd_rawmidi ** rrawmidi)
1440 {
1441 	struct snd_rawmidi *rmidi;
1442 	int err;
1443 	static struct snd_device_ops ops = {
1444 		.dev_free = snd_rawmidi_dev_free,
1445 		.dev_register = snd_rawmidi_dev_register,
1446 		.dev_disconnect = snd_rawmidi_dev_disconnect,
1447 	};
1448 
1449 	if (snd_BUG_ON(!card))
1450 		return -ENXIO;
1451 	if (rrawmidi)
1452 		*rrawmidi = NULL;
1453 	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1454 	if (rmidi == NULL) {
1455 		snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1456 		return -ENOMEM;
1457 	}
1458 	rmidi->card = card;
1459 	rmidi->device = device;
1460 	mutex_init(&rmidi->open_mutex);
1461 	init_waitqueue_head(&rmidi->open_wait);
1462 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1463 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1464 
1465 	if (id != NULL)
1466 		strlcpy(rmidi->id, id, sizeof(rmidi->id));
1467 	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1468 						&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1469 						SNDRV_RAWMIDI_STREAM_INPUT,
1470 						input_count)) < 0) {
1471 		snd_rawmidi_free(rmidi);
1472 		return err;
1473 	}
1474 	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1475 						&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1476 						SNDRV_RAWMIDI_STREAM_OUTPUT,
1477 						output_count)) < 0) {
1478 		snd_rawmidi_free(rmidi);
1479 		return err;
1480 	}
1481 	if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1482 		snd_rawmidi_free(rmidi);
1483 		return err;
1484 	}
1485 	if (rrawmidi)
1486 		*rrawmidi = rmidi;
1487 	return 0;
1488 }
1489 
1490 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1491 {
1492 	struct snd_rawmidi_substream *substream;
1493 
1494 	while (!list_empty(&stream->substreams)) {
1495 		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1496 		list_del(&substream->list);
1497 		kfree(substream);
1498 	}
1499 }
1500 
1501 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1502 {
1503 	if (!rmidi)
1504 		return 0;
1505 
1506 	snd_info_free_entry(rmidi->proc_entry);
1507 	rmidi->proc_entry = NULL;
1508 	mutex_lock(&register_mutex);
1509 	if (rmidi->ops && rmidi->ops->dev_unregister)
1510 		rmidi->ops->dev_unregister(rmidi);
1511 	mutex_unlock(&register_mutex);
1512 
1513 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1514 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1515 	if (rmidi->private_free)
1516 		rmidi->private_free(rmidi);
1517 	kfree(rmidi);
1518 	return 0;
1519 }
1520 
1521 static int snd_rawmidi_dev_free(struct snd_device *device)
1522 {
1523 	struct snd_rawmidi *rmidi = device->device_data;
1524 	return snd_rawmidi_free(rmidi);
1525 }
1526 
1527 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1528 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1529 {
1530 	struct snd_rawmidi *rmidi = device->private_data;
1531 	rmidi->seq_dev = NULL;
1532 }
1533 #endif
1534 
1535 static int snd_rawmidi_dev_register(struct snd_device *device)
1536 {
1537 	int err;
1538 	struct snd_info_entry *entry;
1539 	char name[16];
1540 	struct snd_rawmidi *rmidi = device->device_data;
1541 
1542 	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1543 		return -ENOMEM;
1544 	mutex_lock(&register_mutex);
1545 	if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1546 		mutex_unlock(&register_mutex);
1547 		return -EBUSY;
1548 	}
1549 	list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1550 	sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1551 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1552 				       rmidi->card, rmidi->device,
1553 				       &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1554 		snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1555 		list_del(&rmidi->list);
1556 		mutex_unlock(&register_mutex);
1557 		return err;
1558 	}
1559 	if (rmidi->ops && rmidi->ops->dev_register &&
1560 	    (err = rmidi->ops->dev_register(rmidi)) < 0) {
1561 		snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1562 		list_del(&rmidi->list);
1563 		mutex_unlock(&register_mutex);
1564 		return err;
1565 	}
1566 #ifdef CONFIG_SND_OSSEMUL
1567 	rmidi->ossreg = 0;
1568 	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1569 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1570 					    rmidi->card, 0, &snd_rawmidi_f_ops,
1571 					    rmidi, name) < 0) {
1572 			snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1573 		} else {
1574 			rmidi->ossreg++;
1575 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1576 			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1577 #endif
1578 		}
1579 	}
1580 	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1581 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1582 					    rmidi->card, 1, &snd_rawmidi_f_ops,
1583 					    rmidi, name) < 0) {
1584 			snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1585 		} else {
1586 			rmidi->ossreg++;
1587 		}
1588 	}
1589 #endif /* CONFIG_SND_OSSEMUL */
1590 	mutex_unlock(&register_mutex);
1591 	sprintf(name, "midi%d", rmidi->device);
1592 	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1593 	if (entry) {
1594 		entry->private_data = rmidi;
1595 		entry->c.text.read = snd_rawmidi_proc_info_read;
1596 		if (snd_info_register(entry) < 0) {
1597 			snd_info_free_entry(entry);
1598 			entry = NULL;
1599 		}
1600 	}
1601 	rmidi->proc_entry = entry;
1602 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1603 	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1604 		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1605 			rmidi->seq_dev->private_data = rmidi;
1606 			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1607 			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1608 			snd_device_register(rmidi->card, rmidi->seq_dev);
1609 		}
1610 	}
1611 #endif
1612 	return 0;
1613 }
1614 
1615 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1616 {
1617 	struct snd_rawmidi *rmidi = device->device_data;
1618 
1619 	mutex_lock(&register_mutex);
1620 	list_del_init(&rmidi->list);
1621 #ifdef CONFIG_SND_OSSEMUL
1622 	if (rmidi->ossreg) {
1623 		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1624 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1625 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1626 			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1627 #endif
1628 		}
1629 		if ((int)rmidi->device == amidi_map[rmidi->card->number])
1630 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1631 		rmidi->ossreg = 0;
1632 	}
1633 #endif /* CONFIG_SND_OSSEMUL */
1634 	snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1635 	mutex_unlock(&register_mutex);
1636 	return 0;
1637 }
1638 
1639 /**
1640  * snd_rawmidi_set_ops - set the rawmidi operators
1641  * @rmidi: the rawmidi instance
1642  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1643  * @ops: the operator table
1644  *
1645  * Sets the rawmidi operators for the given stream direction.
1646  */
1647 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1648 			 struct snd_rawmidi_ops *ops)
1649 {
1650 	struct snd_rawmidi_substream *substream;
1651 
1652 	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1653 		substream->ops = ops;
1654 }
1655 
1656 /*
1657  *  ENTRY functions
1658  */
1659 
1660 static int __init alsa_rawmidi_init(void)
1661 {
1662 
1663 	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1664 	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1665 #ifdef CONFIG_SND_OSSEMUL
1666 	{ int i;
1667 	/* check device map table */
1668 	for (i = 0; i < SNDRV_CARDS; i++) {
1669 		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1670 			snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1671 			midi_map[i] = 0;
1672 		}
1673 		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1674 			snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1675 			amidi_map[i] = 1;
1676 		}
1677 	}
1678 	}
1679 #endif /* CONFIG_SND_OSSEMUL */
1680 	return 0;
1681 }
1682 
1683 static void __exit alsa_rawmidi_exit(void)
1684 {
1685 	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1686 	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1687 }
1688 
1689 module_init(alsa_rawmidi_init)
1690 module_exit(alsa_rawmidi_exit)
1691 
1692 EXPORT_SYMBOL(snd_rawmidi_output_params);
1693 EXPORT_SYMBOL(snd_rawmidi_input_params);
1694 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1695 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1696 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1697 EXPORT_SYMBOL(snd_rawmidi_receive);
1698 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1699 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1700 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1701 EXPORT_SYMBOL(snd_rawmidi_transmit);
1702 EXPORT_SYMBOL(snd_rawmidi_new);
1703 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1704 EXPORT_SYMBOL(snd_rawmidi_info_select);
1705 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1706 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1707 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1708 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1709