xref: /linux/sound/core/rawmidi.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /*
2  *  Abstract layer for MIDI v1.0 stream
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21 
22 #include <sound/core.h>
23 #include <linux/major.h>
24 #include <linux/init.h>
25 #include <linux/sched.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/mutex.h>
30 #include <linux/module.h>
31 #include <linux/delay.h>
32 #include <sound/rawmidi.h>
33 #include <sound/info.h>
34 #include <sound/control.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40 MODULE_LICENSE("GPL");
41 
42 #ifdef CONFIG_SND_OSSEMUL
43 static int midi_map[SNDRV_CARDS];
44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45 module_param_array(midi_map, int, NULL, 0444);
46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47 module_param_array(amidi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49 #endif /* CONFIG_SND_OSSEMUL */
50 
51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52 static int snd_rawmidi_dev_free(struct snd_device *device);
53 static int snd_rawmidi_dev_register(struct snd_device *device);
54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55 
56 static LIST_HEAD(snd_rawmidi_devices);
57 static DEFINE_MUTEX(register_mutex);
58 
59 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_work(struct work_struct *work)
96 {
97 	struct snd_rawmidi_runtime *runtime =
98 		container_of(work, struct snd_rawmidi_runtime, event_work);
99 	if (runtime->event)
100 		runtime->event(runtime->substream);
101 }
102 
103 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
104 {
105 	struct snd_rawmidi_runtime *runtime;
106 
107 	if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
108 		return -ENOMEM;
109 	runtime->substream = substream;
110 	spin_lock_init(&runtime->lock);
111 	init_waitqueue_head(&runtime->sleep);
112 	INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
113 	runtime->event = NULL;
114 	runtime->buffer_size = PAGE_SIZE;
115 	runtime->avail_min = 1;
116 	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
117 		runtime->avail = 0;
118 	else
119 		runtime->avail = runtime->buffer_size;
120 	if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
121 		kfree(runtime);
122 		return -ENOMEM;
123 	}
124 	runtime->appl_ptr = runtime->hw_ptr = 0;
125 	substream->runtime = runtime;
126 	return 0;
127 }
128 
129 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
130 {
131 	struct snd_rawmidi_runtime *runtime = substream->runtime;
132 
133 	kfree(runtime->buffer);
134 	kfree(runtime);
135 	substream->runtime = NULL;
136 	return 0;
137 }
138 
139 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
140 {
141 	if (!substream->opened)
142 		return;
143 	substream->ops->trigger(substream, up);
144 }
145 
146 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
147 {
148 	if (!substream->opened)
149 		return;
150 	substream->ops->trigger(substream, up);
151 	if (!up)
152 		cancel_work_sync(&substream->runtime->event_work);
153 }
154 
155 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
156 {
157 	unsigned long flags;
158 	struct snd_rawmidi_runtime *runtime = substream->runtime;
159 
160 	snd_rawmidi_output_trigger(substream, 0);
161 	runtime->drain = 0;
162 	spin_lock_irqsave(&runtime->lock, flags);
163 	runtime->appl_ptr = runtime->hw_ptr = 0;
164 	runtime->avail = runtime->buffer_size;
165 	spin_unlock_irqrestore(&runtime->lock, flags);
166 	return 0;
167 }
168 
169 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
170 {
171 	int err;
172 	long timeout;
173 	struct snd_rawmidi_runtime *runtime = substream->runtime;
174 
175 	err = 0;
176 	runtime->drain = 1;
177 	timeout = wait_event_interruptible_timeout(runtime->sleep,
178 				(runtime->avail >= runtime->buffer_size),
179 				10*HZ);
180 	if (signal_pending(current))
181 		err = -ERESTARTSYS;
182 	if (runtime->avail < runtime->buffer_size && !timeout) {
183 		snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
184 		err = -EIO;
185 	}
186 	runtime->drain = 0;
187 	if (err != -ERESTARTSYS) {
188 		/* we need wait a while to make sure that Tx FIFOs are empty */
189 		if (substream->ops->drain)
190 			substream->ops->drain(substream);
191 		else
192 			msleep(50);
193 		snd_rawmidi_drop_output(substream);
194 	}
195 	return err;
196 }
197 
198 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
199 {
200 	unsigned long flags;
201 	struct snd_rawmidi_runtime *runtime = substream->runtime;
202 
203 	snd_rawmidi_input_trigger(substream, 0);
204 	runtime->drain = 0;
205 	spin_lock_irqsave(&runtime->lock, flags);
206 	runtime->appl_ptr = runtime->hw_ptr = 0;
207 	runtime->avail = 0;
208 	spin_unlock_irqrestore(&runtime->lock, flags);
209 	return 0;
210 }
211 
212 /* look for an available substream for the given stream direction;
213  * if a specific subdevice is given, try to assign it
214  */
215 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
216 			    int stream, int mode,
217 			    struct snd_rawmidi_substream **sub_ret)
218 {
219 	struct snd_rawmidi_substream *substream;
220 	struct snd_rawmidi_str *s = &rmidi->streams[stream];
221 	static unsigned int info_flags[2] = {
222 		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
223 		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
224 	};
225 
226 	if (!(rmidi->info_flags & info_flags[stream]))
227 		return -ENXIO;
228 	if (subdevice >= 0 && subdevice >= s->substream_count)
229 		return -ENODEV;
230 
231 	list_for_each_entry(substream, &s->substreams, list) {
232 		if (substream->opened) {
233 			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
234 			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
235 			    !substream->append)
236 				continue;
237 		}
238 		if (subdevice < 0 || subdevice == substream->number) {
239 			*sub_ret = substream;
240 			return 0;
241 		}
242 	}
243 	return -EAGAIN;
244 }
245 
246 /* open and do ref-counting for the given substream */
247 static int open_substream(struct snd_rawmidi *rmidi,
248 			  struct snd_rawmidi_substream *substream,
249 			  int mode)
250 {
251 	int err;
252 
253 	if (substream->use_count == 0) {
254 		err = snd_rawmidi_runtime_create(substream);
255 		if (err < 0)
256 			return err;
257 		err = substream->ops->open(substream);
258 		if (err < 0) {
259 			snd_rawmidi_runtime_free(substream);
260 			return err;
261 		}
262 		substream->opened = 1;
263 		substream->active_sensing = 0;
264 		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
265 			substream->append = 1;
266 		substream->pid = get_pid(task_pid(current));
267 		rmidi->streams[substream->stream].substream_opened++;
268 	}
269 	substream->use_count++;
270 	return 0;
271 }
272 
273 static void close_substream(struct snd_rawmidi *rmidi,
274 			    struct snd_rawmidi_substream *substream,
275 			    int cleanup);
276 
277 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
278 			     struct snd_rawmidi_file *rfile)
279 {
280 	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
281 	int err;
282 
283 	rfile->input = rfile->output = NULL;
284 	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
285 		err = assign_substream(rmidi, subdevice,
286 				       SNDRV_RAWMIDI_STREAM_INPUT,
287 				       mode, &sinput);
288 		if (err < 0)
289 			return err;
290 	}
291 	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
292 		err = assign_substream(rmidi, subdevice,
293 				       SNDRV_RAWMIDI_STREAM_OUTPUT,
294 				       mode, &soutput);
295 		if (err < 0)
296 			return err;
297 	}
298 
299 	if (sinput) {
300 		err = open_substream(rmidi, sinput, mode);
301 		if (err < 0)
302 			return err;
303 	}
304 	if (soutput) {
305 		err = open_substream(rmidi, soutput, mode);
306 		if (err < 0) {
307 			if (sinput)
308 				close_substream(rmidi, sinput, 0);
309 			return err;
310 		}
311 	}
312 
313 	rfile->rmidi = rmidi;
314 	rfile->input = sinput;
315 	rfile->output = soutput;
316 	return 0;
317 }
318 
319 /* called from sound/core/seq/seq_midi.c */
320 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
321 			    int mode, struct snd_rawmidi_file * rfile)
322 {
323 	struct snd_rawmidi *rmidi;
324 	int err;
325 
326 	if (snd_BUG_ON(!rfile))
327 		return -EINVAL;
328 
329 	mutex_lock(&register_mutex);
330 	rmidi = snd_rawmidi_search(card, device);
331 	if (rmidi == NULL) {
332 		mutex_unlock(&register_mutex);
333 		return -ENODEV;
334 	}
335 	if (!try_module_get(rmidi->card->module)) {
336 		mutex_unlock(&register_mutex);
337 		return -ENXIO;
338 	}
339 	mutex_unlock(&register_mutex);
340 
341 	mutex_lock(&rmidi->open_mutex);
342 	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
343 	mutex_unlock(&rmidi->open_mutex);
344 	if (err < 0)
345 		module_put(rmidi->card->module);
346 	return err;
347 }
348 
349 static int snd_rawmidi_open(struct inode *inode, struct file *file)
350 {
351 	int maj = imajor(inode);
352 	struct snd_card *card;
353 	int subdevice;
354 	unsigned short fflags;
355 	int err;
356 	struct snd_rawmidi *rmidi;
357 	struct snd_rawmidi_file *rawmidi_file = NULL;
358 	wait_queue_t wait;
359 	struct snd_ctl_file *kctl;
360 
361 	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
362 		return -EINVAL;		/* invalid combination */
363 
364 	err = nonseekable_open(inode, file);
365 	if (err < 0)
366 		return err;
367 
368 	if (maj == snd_major) {
369 		rmidi = snd_lookup_minor_data(iminor(inode),
370 					      SNDRV_DEVICE_TYPE_RAWMIDI);
371 #ifdef CONFIG_SND_OSSEMUL
372 	} else if (maj == SOUND_MAJOR) {
373 		rmidi = snd_lookup_oss_minor_data(iminor(inode),
374 						  SNDRV_OSS_DEVICE_TYPE_MIDI);
375 #endif
376 	} else
377 		return -ENXIO;
378 
379 	if (rmidi == NULL)
380 		return -ENODEV;
381 
382 	if (!try_module_get(rmidi->card->module))
383 		return -ENXIO;
384 
385 	mutex_lock(&rmidi->open_mutex);
386 	card = rmidi->card;
387 	err = snd_card_file_add(card, file);
388 	if (err < 0)
389 		goto __error_card;
390 	fflags = snd_rawmidi_file_flags(file);
391 	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
392 		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
393 	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
394 	if (rawmidi_file == NULL) {
395 		err = -ENOMEM;
396 		goto __error;
397 	}
398 	init_waitqueue_entry(&wait, current);
399 	add_wait_queue(&rmidi->open_wait, &wait);
400 	while (1) {
401 		subdevice = -1;
402 		read_lock(&card->ctl_files_rwlock);
403 		list_for_each_entry(kctl, &card->ctl_files, list) {
404 			if (kctl->pid == task_pid(current)) {
405 				subdevice = kctl->prefer_rawmidi_subdevice;
406 				if (subdevice != -1)
407 					break;
408 			}
409 		}
410 		read_unlock(&card->ctl_files_rwlock);
411 		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
412 		if (err >= 0)
413 			break;
414 		if (err == -EAGAIN) {
415 			if (file->f_flags & O_NONBLOCK) {
416 				err = -EBUSY;
417 				break;
418 			}
419 		} else
420 			break;
421 		set_current_state(TASK_INTERRUPTIBLE);
422 		mutex_unlock(&rmidi->open_mutex);
423 		schedule();
424 		mutex_lock(&rmidi->open_mutex);
425 		if (signal_pending(current)) {
426 			err = -ERESTARTSYS;
427 			break;
428 		}
429 	}
430 	remove_wait_queue(&rmidi->open_wait, &wait);
431 	if (err < 0) {
432 		kfree(rawmidi_file);
433 		goto __error;
434 	}
435 #ifdef CONFIG_SND_OSSEMUL
436 	if (rawmidi_file->input && rawmidi_file->input->runtime)
437 		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
438 	if (rawmidi_file->output && rawmidi_file->output->runtime)
439 		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
440 #endif
441 	file->private_data = rawmidi_file;
442 	mutex_unlock(&rmidi->open_mutex);
443 	return 0;
444 
445  __error:
446 	snd_card_file_remove(card, file);
447  __error_card:
448 	mutex_unlock(&rmidi->open_mutex);
449 	module_put(rmidi->card->module);
450 	return err;
451 }
452 
453 static void close_substream(struct snd_rawmidi *rmidi,
454 			    struct snd_rawmidi_substream *substream,
455 			    int cleanup)
456 {
457 	if (--substream->use_count)
458 		return;
459 
460 	if (cleanup) {
461 		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
462 			snd_rawmidi_input_trigger(substream, 0);
463 		else {
464 			if (substream->active_sensing) {
465 				unsigned char buf = 0xfe;
466 				/* sending single active sensing message
467 				 * to shut the device up
468 				 */
469 				snd_rawmidi_kernel_write(substream, &buf, 1);
470 			}
471 			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
472 				snd_rawmidi_output_trigger(substream, 0);
473 		}
474 	}
475 	substream->ops->close(substream);
476 	if (substream->runtime->private_free)
477 		substream->runtime->private_free(substream);
478 	snd_rawmidi_runtime_free(substream);
479 	substream->opened = 0;
480 	substream->append = 0;
481 	put_pid(substream->pid);
482 	substream->pid = NULL;
483 	rmidi->streams[substream->stream].substream_opened--;
484 }
485 
486 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
487 {
488 	struct snd_rawmidi *rmidi;
489 
490 	rmidi = rfile->rmidi;
491 	mutex_lock(&rmidi->open_mutex);
492 	if (rfile->input) {
493 		close_substream(rmidi, rfile->input, 1);
494 		rfile->input = NULL;
495 	}
496 	if (rfile->output) {
497 		close_substream(rmidi, rfile->output, 1);
498 		rfile->output = NULL;
499 	}
500 	rfile->rmidi = NULL;
501 	mutex_unlock(&rmidi->open_mutex);
502 	wake_up(&rmidi->open_wait);
503 }
504 
505 /* called from sound/core/seq/seq_midi.c */
506 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
507 {
508 	struct snd_rawmidi *rmidi;
509 
510 	if (snd_BUG_ON(!rfile))
511 		return -ENXIO;
512 
513 	rmidi = rfile->rmidi;
514 	rawmidi_release_priv(rfile);
515 	module_put(rmidi->card->module);
516 	return 0;
517 }
518 
519 static int snd_rawmidi_release(struct inode *inode, struct file *file)
520 {
521 	struct snd_rawmidi_file *rfile;
522 	struct snd_rawmidi *rmidi;
523 	struct module *module;
524 
525 	rfile = file->private_data;
526 	rmidi = rfile->rmidi;
527 	rawmidi_release_priv(rfile);
528 	kfree(rfile);
529 	module = rmidi->card->module;
530 	snd_card_file_remove(rmidi->card, file);
531 	module_put(module);
532 	return 0;
533 }
534 
535 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
536 			    struct snd_rawmidi_info *info)
537 {
538 	struct snd_rawmidi *rmidi;
539 
540 	if (substream == NULL)
541 		return -ENODEV;
542 	rmidi = substream->rmidi;
543 	memset(info, 0, sizeof(*info));
544 	info->card = rmidi->card->number;
545 	info->device = rmidi->device;
546 	info->subdevice = substream->number;
547 	info->stream = substream->stream;
548 	info->flags = rmidi->info_flags;
549 	strcpy(info->id, rmidi->id);
550 	strcpy(info->name, rmidi->name);
551 	strcpy(info->subname, substream->name);
552 	info->subdevices_count = substream->pstr->substream_count;
553 	info->subdevices_avail = (substream->pstr->substream_count -
554 				  substream->pstr->substream_opened);
555 	return 0;
556 }
557 
558 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
559 				 struct snd_rawmidi_info __user * _info)
560 {
561 	struct snd_rawmidi_info info;
562 	int err;
563 	if ((err = snd_rawmidi_info(substream, &info)) < 0)
564 		return err;
565 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
566 		return -EFAULT;
567 	return 0;
568 }
569 
570 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
571 {
572 	struct snd_rawmidi *rmidi;
573 	struct snd_rawmidi_str *pstr;
574 	struct snd_rawmidi_substream *substream;
575 
576 	mutex_lock(&register_mutex);
577 	rmidi = snd_rawmidi_search(card, info->device);
578 	mutex_unlock(&register_mutex);
579 	if (!rmidi)
580 		return -ENXIO;
581 	if (info->stream < 0 || info->stream > 1)
582 		return -EINVAL;
583 	pstr = &rmidi->streams[info->stream];
584 	if (pstr->substream_count == 0)
585 		return -ENOENT;
586 	if (info->subdevice >= pstr->substream_count)
587 		return -ENXIO;
588 	list_for_each_entry(substream, &pstr->substreams, list) {
589 		if ((unsigned int)substream->number == info->subdevice)
590 			return snd_rawmidi_info(substream, info);
591 	}
592 	return -ENXIO;
593 }
594 
595 static int snd_rawmidi_info_select_user(struct snd_card *card,
596 					struct snd_rawmidi_info __user *_info)
597 {
598 	int err;
599 	struct snd_rawmidi_info info;
600 	if (get_user(info.device, &_info->device))
601 		return -EFAULT;
602 	if (get_user(info.stream, &_info->stream))
603 		return -EFAULT;
604 	if (get_user(info.subdevice, &_info->subdevice))
605 		return -EFAULT;
606 	if ((err = snd_rawmidi_info_select(card, &info)) < 0)
607 		return err;
608 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
609 		return -EFAULT;
610 	return 0;
611 }
612 
613 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
614 			      struct snd_rawmidi_params * params)
615 {
616 	char *newbuf;
617 	struct snd_rawmidi_runtime *runtime = substream->runtime;
618 
619 	if (substream->append && substream->use_count > 1)
620 		return -EBUSY;
621 	snd_rawmidi_drain_output(substream);
622 	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
623 		return -EINVAL;
624 	}
625 	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
626 		return -EINVAL;
627 	}
628 	if (params->buffer_size != runtime->buffer_size) {
629 		newbuf = krealloc(runtime->buffer, params->buffer_size,
630 				  GFP_KERNEL);
631 		if (!newbuf)
632 			return -ENOMEM;
633 		runtime->buffer = newbuf;
634 		runtime->buffer_size = params->buffer_size;
635 		runtime->avail = runtime->buffer_size;
636 	}
637 	runtime->avail_min = params->avail_min;
638 	substream->active_sensing = !params->no_active_sensing;
639 	return 0;
640 }
641 
642 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
643 			     struct snd_rawmidi_params * params)
644 {
645 	char *newbuf;
646 	struct snd_rawmidi_runtime *runtime = substream->runtime;
647 
648 	snd_rawmidi_drain_input(substream);
649 	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
650 		return -EINVAL;
651 	}
652 	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
653 		return -EINVAL;
654 	}
655 	if (params->buffer_size != runtime->buffer_size) {
656 		newbuf = krealloc(runtime->buffer, params->buffer_size,
657 				  GFP_KERNEL);
658 		if (!newbuf)
659 			return -ENOMEM;
660 		runtime->buffer = newbuf;
661 		runtime->buffer_size = params->buffer_size;
662 	}
663 	runtime->avail_min = params->avail_min;
664 	return 0;
665 }
666 
667 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
668 				     struct snd_rawmidi_status * status)
669 {
670 	struct snd_rawmidi_runtime *runtime = substream->runtime;
671 
672 	memset(status, 0, sizeof(*status));
673 	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
674 	spin_lock_irq(&runtime->lock);
675 	status->avail = runtime->avail;
676 	spin_unlock_irq(&runtime->lock);
677 	return 0;
678 }
679 
680 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
681 				    struct snd_rawmidi_status * status)
682 {
683 	struct snd_rawmidi_runtime *runtime = substream->runtime;
684 
685 	memset(status, 0, sizeof(*status));
686 	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
687 	spin_lock_irq(&runtime->lock);
688 	status->avail = runtime->avail;
689 	status->xruns = runtime->xruns;
690 	runtime->xruns = 0;
691 	spin_unlock_irq(&runtime->lock);
692 	return 0;
693 }
694 
695 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
696 {
697 	struct snd_rawmidi_file *rfile;
698 	void __user *argp = (void __user *)arg;
699 
700 	rfile = file->private_data;
701 	if (((cmd >> 8) & 0xff) != 'W')
702 		return -ENOTTY;
703 	switch (cmd) {
704 	case SNDRV_RAWMIDI_IOCTL_PVERSION:
705 		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
706 	case SNDRV_RAWMIDI_IOCTL_INFO:
707 	{
708 		int stream;
709 		struct snd_rawmidi_info __user *info = argp;
710 		if (get_user(stream, &info->stream))
711 			return -EFAULT;
712 		switch (stream) {
713 		case SNDRV_RAWMIDI_STREAM_INPUT:
714 			return snd_rawmidi_info_user(rfile->input, info);
715 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
716 			return snd_rawmidi_info_user(rfile->output, info);
717 		default:
718 			return -EINVAL;
719 		}
720 	}
721 	case SNDRV_RAWMIDI_IOCTL_PARAMS:
722 	{
723 		struct snd_rawmidi_params params;
724 		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
725 			return -EFAULT;
726 		switch (params.stream) {
727 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
728 			if (rfile->output == NULL)
729 				return -EINVAL;
730 			return snd_rawmidi_output_params(rfile->output, &params);
731 		case SNDRV_RAWMIDI_STREAM_INPUT:
732 			if (rfile->input == NULL)
733 				return -EINVAL;
734 			return snd_rawmidi_input_params(rfile->input, &params);
735 		default:
736 			return -EINVAL;
737 		}
738 	}
739 	case SNDRV_RAWMIDI_IOCTL_STATUS:
740 	{
741 		int err = 0;
742 		struct snd_rawmidi_status status;
743 		if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
744 			return -EFAULT;
745 		switch (status.stream) {
746 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
747 			if (rfile->output == NULL)
748 				return -EINVAL;
749 			err = snd_rawmidi_output_status(rfile->output, &status);
750 			break;
751 		case SNDRV_RAWMIDI_STREAM_INPUT:
752 			if (rfile->input == NULL)
753 				return -EINVAL;
754 			err = snd_rawmidi_input_status(rfile->input, &status);
755 			break;
756 		default:
757 			return -EINVAL;
758 		}
759 		if (err < 0)
760 			return err;
761 		if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
762 			return -EFAULT;
763 		return 0;
764 	}
765 	case SNDRV_RAWMIDI_IOCTL_DROP:
766 	{
767 		int val;
768 		if (get_user(val, (int __user *) argp))
769 			return -EFAULT;
770 		switch (val) {
771 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
772 			if (rfile->output == NULL)
773 				return -EINVAL;
774 			return snd_rawmidi_drop_output(rfile->output);
775 		default:
776 			return -EINVAL;
777 		}
778 	}
779 	case SNDRV_RAWMIDI_IOCTL_DRAIN:
780 	{
781 		int val;
782 		if (get_user(val, (int __user *) argp))
783 			return -EFAULT;
784 		switch (val) {
785 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
786 			if (rfile->output == NULL)
787 				return -EINVAL;
788 			return snd_rawmidi_drain_output(rfile->output);
789 		case SNDRV_RAWMIDI_STREAM_INPUT:
790 			if (rfile->input == NULL)
791 				return -EINVAL;
792 			return snd_rawmidi_drain_input(rfile->input);
793 		default:
794 			return -EINVAL;
795 		}
796 	}
797 #ifdef CONFIG_SND_DEBUG
798 	default:
799 		snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
800 #endif
801 	}
802 	return -ENOTTY;
803 }
804 
805 static int snd_rawmidi_control_ioctl(struct snd_card *card,
806 				     struct snd_ctl_file *control,
807 				     unsigned int cmd,
808 				     unsigned long arg)
809 {
810 	void __user *argp = (void __user *)arg;
811 
812 	switch (cmd) {
813 	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
814 	{
815 		int device;
816 
817 		if (get_user(device, (int __user *)argp))
818 			return -EFAULT;
819 		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
820 			device = SNDRV_RAWMIDI_DEVICES - 1;
821 		mutex_lock(&register_mutex);
822 		device = device < 0 ? 0 : device + 1;
823 		while (device < SNDRV_RAWMIDI_DEVICES) {
824 			if (snd_rawmidi_search(card, device))
825 				break;
826 			device++;
827 		}
828 		if (device == SNDRV_RAWMIDI_DEVICES)
829 			device = -1;
830 		mutex_unlock(&register_mutex);
831 		if (put_user(device, (int __user *)argp))
832 			return -EFAULT;
833 		return 0;
834 	}
835 	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
836 	{
837 		int val;
838 
839 		if (get_user(val, (int __user *)argp))
840 			return -EFAULT;
841 		control->prefer_rawmidi_subdevice = val;
842 		return 0;
843 	}
844 	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
845 		return snd_rawmidi_info_select_user(card, argp);
846 	}
847 	return -ENOIOCTLCMD;
848 }
849 
850 /**
851  * snd_rawmidi_receive - receive the input data from the device
852  * @substream: the rawmidi substream
853  * @buffer: the buffer pointer
854  * @count: the data size to read
855  *
856  * Reads the data from the internal buffer.
857  *
858  * Returns the size of read data, or a negative error code on failure.
859  */
860 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
861 			const unsigned char *buffer, int count)
862 {
863 	unsigned long flags;
864 	int result = 0, count1;
865 	struct snd_rawmidi_runtime *runtime = substream->runtime;
866 
867 	if (!substream->opened)
868 		return -EBADFD;
869 	if (runtime->buffer == NULL) {
870 		snd_printd("snd_rawmidi_receive: input is not active!!!\n");
871 		return -EINVAL;
872 	}
873 	spin_lock_irqsave(&runtime->lock, flags);
874 	if (count == 1) {	/* special case, faster code */
875 		substream->bytes++;
876 		if (runtime->avail < runtime->buffer_size) {
877 			runtime->buffer[runtime->hw_ptr++] = buffer[0];
878 			runtime->hw_ptr %= runtime->buffer_size;
879 			runtime->avail++;
880 			result++;
881 		} else {
882 			runtime->xruns++;
883 		}
884 	} else {
885 		substream->bytes += count;
886 		count1 = runtime->buffer_size - runtime->hw_ptr;
887 		if (count1 > count)
888 			count1 = count;
889 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
890 			count1 = runtime->buffer_size - runtime->avail;
891 		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
892 		runtime->hw_ptr += count1;
893 		runtime->hw_ptr %= runtime->buffer_size;
894 		runtime->avail += count1;
895 		count -= count1;
896 		result += count1;
897 		if (count > 0) {
898 			buffer += count1;
899 			count1 = count;
900 			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
901 				count1 = runtime->buffer_size - runtime->avail;
902 				runtime->xruns += count - count1;
903 			}
904 			if (count1 > 0) {
905 				memcpy(runtime->buffer, buffer, count1);
906 				runtime->hw_ptr = count1;
907 				runtime->avail += count1;
908 				result += count1;
909 			}
910 		}
911 	}
912 	if (result > 0) {
913 		if (runtime->event)
914 			schedule_work(&runtime->event_work);
915 		else if (snd_rawmidi_ready(substream))
916 			wake_up(&runtime->sleep);
917 	}
918 	spin_unlock_irqrestore(&runtime->lock, flags);
919 	return result;
920 }
921 
922 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
923 				     unsigned char __user *userbuf,
924 				     unsigned char *kernelbuf, long count)
925 {
926 	unsigned long flags;
927 	long result = 0, count1;
928 	struct snd_rawmidi_runtime *runtime = substream->runtime;
929 
930 	while (count > 0 && runtime->avail) {
931 		count1 = runtime->buffer_size - runtime->appl_ptr;
932 		if (count1 > count)
933 			count1 = count;
934 		spin_lock_irqsave(&runtime->lock, flags);
935 		if (count1 > (int)runtime->avail)
936 			count1 = runtime->avail;
937 		if (kernelbuf)
938 			memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
939 		if (userbuf) {
940 			spin_unlock_irqrestore(&runtime->lock, flags);
941 			if (copy_to_user(userbuf + result,
942 					 runtime->buffer + runtime->appl_ptr, count1)) {
943 				return result > 0 ? result : -EFAULT;
944 			}
945 			spin_lock_irqsave(&runtime->lock, flags);
946 		}
947 		runtime->appl_ptr += count1;
948 		runtime->appl_ptr %= runtime->buffer_size;
949 		runtime->avail -= count1;
950 		spin_unlock_irqrestore(&runtime->lock, flags);
951 		result += count1;
952 		count -= count1;
953 	}
954 	return result;
955 }
956 
957 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
958 			     unsigned char *buf, long count)
959 {
960 	snd_rawmidi_input_trigger(substream, 1);
961 	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
962 }
963 
964 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
965 				loff_t *offset)
966 {
967 	long result;
968 	int count1;
969 	struct snd_rawmidi_file *rfile;
970 	struct snd_rawmidi_substream *substream;
971 	struct snd_rawmidi_runtime *runtime;
972 
973 	rfile = file->private_data;
974 	substream = rfile->input;
975 	if (substream == NULL)
976 		return -EIO;
977 	runtime = substream->runtime;
978 	snd_rawmidi_input_trigger(substream, 1);
979 	result = 0;
980 	while (count > 0) {
981 		spin_lock_irq(&runtime->lock);
982 		while (!snd_rawmidi_ready(substream)) {
983 			wait_queue_t wait;
984 			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
985 				spin_unlock_irq(&runtime->lock);
986 				return result > 0 ? result : -EAGAIN;
987 			}
988 			init_waitqueue_entry(&wait, current);
989 			add_wait_queue(&runtime->sleep, &wait);
990 			set_current_state(TASK_INTERRUPTIBLE);
991 			spin_unlock_irq(&runtime->lock);
992 			schedule();
993 			remove_wait_queue(&runtime->sleep, &wait);
994 			if (signal_pending(current))
995 				return result > 0 ? result : -ERESTARTSYS;
996 			if (!runtime->avail)
997 				return result > 0 ? result : -EIO;
998 			spin_lock_irq(&runtime->lock);
999 		}
1000 		spin_unlock_irq(&runtime->lock);
1001 		count1 = snd_rawmidi_kernel_read1(substream,
1002 						  (unsigned char __user *)buf,
1003 						  NULL/*kernelbuf*/,
1004 						  count);
1005 		if (count1 < 0)
1006 			return result > 0 ? result : count1;
1007 		result += count1;
1008 		buf += count1;
1009 		count -= count1;
1010 	}
1011 	return result;
1012 }
1013 
1014 /**
1015  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1016  * @substream: the rawmidi substream
1017  *
1018  * Returns 1 if the internal output buffer is empty, 0 if not.
1019  */
1020 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1021 {
1022 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1023 	int result;
1024 	unsigned long flags;
1025 
1026 	if (runtime->buffer == NULL) {
1027 		snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1028 		return 1;
1029 	}
1030 	spin_lock_irqsave(&runtime->lock, flags);
1031 	result = runtime->avail >= runtime->buffer_size;
1032 	spin_unlock_irqrestore(&runtime->lock, flags);
1033 	return result;
1034 }
1035 
1036 /**
1037  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1038  * @substream: the rawmidi substream
1039  * @buffer: the buffer pointer
1040  * @count: data size to transfer
1041  *
1042  * Copies data from the internal output buffer to the given buffer.
1043  *
1044  * Call this in the interrupt handler when the midi output is ready,
1045  * and call snd_rawmidi_transmit_ack() after the transmission is
1046  * finished.
1047  *
1048  * Returns the size of copied data, or a negative error code on failure.
1049  */
1050 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1051 			      unsigned char *buffer, int count)
1052 {
1053 	unsigned long flags;
1054 	int result, count1;
1055 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1056 
1057 	if (runtime->buffer == NULL) {
1058 		snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1059 		return -EINVAL;
1060 	}
1061 	result = 0;
1062 	spin_lock_irqsave(&runtime->lock, flags);
1063 	if (runtime->avail >= runtime->buffer_size) {
1064 		/* warning: lowlevel layer MUST trigger down the hardware */
1065 		goto __skip;
1066 	}
1067 	if (count == 1) {	/* special case, faster code */
1068 		*buffer = runtime->buffer[runtime->hw_ptr];
1069 		result++;
1070 	} else {
1071 		count1 = runtime->buffer_size - runtime->hw_ptr;
1072 		if (count1 > count)
1073 			count1 = count;
1074 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1075 			count1 = runtime->buffer_size - runtime->avail;
1076 		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1077 		count -= count1;
1078 		result += count1;
1079 		if (count > 0) {
1080 			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1081 				count = runtime->buffer_size - runtime->avail - count1;
1082 			memcpy(buffer + count1, runtime->buffer, count);
1083 			result += count;
1084 		}
1085 	}
1086       __skip:
1087 	spin_unlock_irqrestore(&runtime->lock, flags);
1088 	return result;
1089 }
1090 
1091 /**
1092  * snd_rawmidi_transmit_ack - acknowledge the transmission
1093  * @substream: the rawmidi substream
1094  * @count: the tranferred count
1095  *
1096  * Advances the hardware pointer for the internal output buffer with
1097  * the given size and updates the condition.
1098  * Call after the transmission is finished.
1099  *
1100  * Returns the advanced size if successful, or a negative error code on failure.
1101  */
1102 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1103 {
1104 	unsigned long flags;
1105 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1106 
1107 	if (runtime->buffer == NULL) {
1108 		snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1109 		return -EINVAL;
1110 	}
1111 	spin_lock_irqsave(&runtime->lock, flags);
1112 	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1113 	runtime->hw_ptr += count;
1114 	runtime->hw_ptr %= runtime->buffer_size;
1115 	runtime->avail += count;
1116 	substream->bytes += count;
1117 	if (count > 0) {
1118 		if (runtime->drain || snd_rawmidi_ready(substream))
1119 			wake_up(&runtime->sleep);
1120 	}
1121 	spin_unlock_irqrestore(&runtime->lock, flags);
1122 	return count;
1123 }
1124 
1125 /**
1126  * snd_rawmidi_transmit - copy from the buffer to the device
1127  * @substream: the rawmidi substream
1128  * @buffer: the buffer pointer
1129  * @count: the data size to transfer
1130  *
1131  * Copies data from the buffer to the device and advances the pointer.
1132  *
1133  * Returns the copied size if successful, or a negative error code on failure.
1134  */
1135 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1136 			 unsigned char *buffer, int count)
1137 {
1138 	if (!substream->opened)
1139 		return -EBADFD;
1140 	count = snd_rawmidi_transmit_peek(substream, buffer, count);
1141 	if (count < 0)
1142 		return count;
1143 	return snd_rawmidi_transmit_ack(substream, count);
1144 }
1145 
1146 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1147 				      const unsigned char __user *userbuf,
1148 				      const unsigned char *kernelbuf,
1149 				      long count)
1150 {
1151 	unsigned long flags;
1152 	long count1, result;
1153 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1154 
1155 	if (snd_BUG_ON(!kernelbuf && !userbuf))
1156 		return -EINVAL;
1157 	if (snd_BUG_ON(!runtime->buffer))
1158 		return -EINVAL;
1159 
1160 	result = 0;
1161 	spin_lock_irqsave(&runtime->lock, flags);
1162 	if (substream->append) {
1163 		if ((long)runtime->avail < count) {
1164 			spin_unlock_irqrestore(&runtime->lock, flags);
1165 			return -EAGAIN;
1166 		}
1167 	}
1168 	while (count > 0 && runtime->avail > 0) {
1169 		count1 = runtime->buffer_size - runtime->appl_ptr;
1170 		if (count1 > count)
1171 			count1 = count;
1172 		if (count1 > (long)runtime->avail)
1173 			count1 = runtime->avail;
1174 		if (kernelbuf)
1175 			memcpy(runtime->buffer + runtime->appl_ptr,
1176 			       kernelbuf + result, count1);
1177 		else if (userbuf) {
1178 			spin_unlock_irqrestore(&runtime->lock, flags);
1179 			if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1180 					   userbuf + result, count1)) {
1181 				spin_lock_irqsave(&runtime->lock, flags);
1182 				result = result > 0 ? result : -EFAULT;
1183 				goto __end;
1184 			}
1185 			spin_lock_irqsave(&runtime->lock, flags);
1186 		}
1187 		runtime->appl_ptr += count1;
1188 		runtime->appl_ptr %= runtime->buffer_size;
1189 		runtime->avail -= count1;
1190 		result += count1;
1191 		count -= count1;
1192 	}
1193       __end:
1194 	count1 = runtime->avail < runtime->buffer_size;
1195 	spin_unlock_irqrestore(&runtime->lock, flags);
1196 	if (count1)
1197 		snd_rawmidi_output_trigger(substream, 1);
1198 	return result;
1199 }
1200 
1201 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1202 			      const unsigned char *buf, long count)
1203 {
1204 	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1205 }
1206 
1207 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1208 				 size_t count, loff_t *offset)
1209 {
1210 	long result, timeout;
1211 	int count1;
1212 	struct snd_rawmidi_file *rfile;
1213 	struct snd_rawmidi_runtime *runtime;
1214 	struct snd_rawmidi_substream *substream;
1215 
1216 	rfile = file->private_data;
1217 	substream = rfile->output;
1218 	runtime = substream->runtime;
1219 	/* we cannot put an atomic message to our buffer */
1220 	if (substream->append && count > runtime->buffer_size)
1221 		return -EIO;
1222 	result = 0;
1223 	while (count > 0) {
1224 		spin_lock_irq(&runtime->lock);
1225 		while (!snd_rawmidi_ready_append(substream, count)) {
1226 			wait_queue_t wait;
1227 			if (file->f_flags & O_NONBLOCK) {
1228 				spin_unlock_irq(&runtime->lock);
1229 				return result > 0 ? result : -EAGAIN;
1230 			}
1231 			init_waitqueue_entry(&wait, current);
1232 			add_wait_queue(&runtime->sleep, &wait);
1233 			set_current_state(TASK_INTERRUPTIBLE);
1234 			spin_unlock_irq(&runtime->lock);
1235 			timeout = schedule_timeout(30 * HZ);
1236 			remove_wait_queue(&runtime->sleep, &wait);
1237 			if (signal_pending(current))
1238 				return result > 0 ? result : -ERESTARTSYS;
1239 			if (!runtime->avail && !timeout)
1240 				return result > 0 ? result : -EIO;
1241 			spin_lock_irq(&runtime->lock);
1242 		}
1243 		spin_unlock_irq(&runtime->lock);
1244 		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1245 		if (count1 < 0)
1246 			return result > 0 ? result : count1;
1247 		result += count1;
1248 		buf += count1;
1249 		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1250 			break;
1251 		count -= count1;
1252 	}
1253 	if (file->f_flags & O_DSYNC) {
1254 		spin_lock_irq(&runtime->lock);
1255 		while (runtime->avail != runtime->buffer_size) {
1256 			wait_queue_t wait;
1257 			unsigned int last_avail = runtime->avail;
1258 			init_waitqueue_entry(&wait, current);
1259 			add_wait_queue(&runtime->sleep, &wait);
1260 			set_current_state(TASK_INTERRUPTIBLE);
1261 			spin_unlock_irq(&runtime->lock);
1262 			timeout = schedule_timeout(30 * HZ);
1263 			remove_wait_queue(&runtime->sleep, &wait);
1264 			if (signal_pending(current))
1265 				return result > 0 ? result : -ERESTARTSYS;
1266 			if (runtime->avail == last_avail && !timeout)
1267 				return result > 0 ? result : -EIO;
1268 			spin_lock_irq(&runtime->lock);
1269 		}
1270 		spin_unlock_irq(&runtime->lock);
1271 	}
1272 	return result;
1273 }
1274 
1275 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1276 {
1277 	struct snd_rawmidi_file *rfile;
1278 	struct snd_rawmidi_runtime *runtime;
1279 	unsigned int mask;
1280 
1281 	rfile = file->private_data;
1282 	if (rfile->input != NULL) {
1283 		runtime = rfile->input->runtime;
1284 		snd_rawmidi_input_trigger(rfile->input, 1);
1285 		poll_wait(file, &runtime->sleep, wait);
1286 	}
1287 	if (rfile->output != NULL) {
1288 		runtime = rfile->output->runtime;
1289 		poll_wait(file, &runtime->sleep, wait);
1290 	}
1291 	mask = 0;
1292 	if (rfile->input != NULL) {
1293 		if (snd_rawmidi_ready(rfile->input))
1294 			mask |= POLLIN | POLLRDNORM;
1295 	}
1296 	if (rfile->output != NULL) {
1297 		if (snd_rawmidi_ready(rfile->output))
1298 			mask |= POLLOUT | POLLWRNORM;
1299 	}
1300 	return mask;
1301 }
1302 
1303 /*
1304  */
1305 #ifdef CONFIG_COMPAT
1306 #include "rawmidi_compat.c"
1307 #else
1308 #define snd_rawmidi_ioctl_compat	NULL
1309 #endif
1310 
1311 /*
1312 
1313  */
1314 
1315 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1316 				       struct snd_info_buffer *buffer)
1317 {
1318 	struct snd_rawmidi *rmidi;
1319 	struct snd_rawmidi_substream *substream;
1320 	struct snd_rawmidi_runtime *runtime;
1321 
1322 	rmidi = entry->private_data;
1323 	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1324 	mutex_lock(&rmidi->open_mutex);
1325 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1326 		list_for_each_entry(substream,
1327 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1328 				    list) {
1329 			snd_iprintf(buffer,
1330 				    "Output %d\n"
1331 				    "  Tx bytes     : %lu\n",
1332 				    substream->number,
1333 				    (unsigned long) substream->bytes);
1334 			if (substream->opened) {
1335 				snd_iprintf(buffer,
1336 				    "  Owner PID    : %d\n",
1337 				    pid_vnr(substream->pid));
1338 				runtime = substream->runtime;
1339 				snd_iprintf(buffer,
1340 				    "  Mode         : %s\n"
1341 				    "  Buffer size  : %lu\n"
1342 				    "  Avail        : %lu\n",
1343 				    runtime->oss ? "OSS compatible" : "native",
1344 				    (unsigned long) runtime->buffer_size,
1345 				    (unsigned long) runtime->avail);
1346 			}
1347 		}
1348 	}
1349 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1350 		list_for_each_entry(substream,
1351 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1352 				    list) {
1353 			snd_iprintf(buffer,
1354 				    "Input %d\n"
1355 				    "  Rx bytes     : %lu\n",
1356 				    substream->number,
1357 				    (unsigned long) substream->bytes);
1358 			if (substream->opened) {
1359 				snd_iprintf(buffer,
1360 					    "  Owner PID    : %d\n",
1361 					    pid_vnr(substream->pid));
1362 				runtime = substream->runtime;
1363 				snd_iprintf(buffer,
1364 					    "  Buffer size  : %lu\n"
1365 					    "  Avail        : %lu\n"
1366 					    "  Overruns     : %lu\n",
1367 					    (unsigned long) runtime->buffer_size,
1368 					    (unsigned long) runtime->avail,
1369 					    (unsigned long) runtime->xruns);
1370 			}
1371 		}
1372 	}
1373 	mutex_unlock(&rmidi->open_mutex);
1374 }
1375 
1376 /*
1377  *  Register functions
1378  */
1379 
1380 static const struct file_operations snd_rawmidi_f_ops =
1381 {
1382 	.owner =	THIS_MODULE,
1383 	.read =		snd_rawmidi_read,
1384 	.write =	snd_rawmidi_write,
1385 	.open =		snd_rawmidi_open,
1386 	.release =	snd_rawmidi_release,
1387 	.llseek =	no_llseek,
1388 	.poll =		snd_rawmidi_poll,
1389 	.unlocked_ioctl =	snd_rawmidi_ioctl,
1390 	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1391 };
1392 
1393 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1394 					struct snd_rawmidi_str *stream,
1395 					int direction,
1396 					int count)
1397 {
1398 	struct snd_rawmidi_substream *substream;
1399 	int idx;
1400 
1401 	for (idx = 0; idx < count; idx++) {
1402 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1403 		if (substream == NULL) {
1404 			snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1405 			return -ENOMEM;
1406 		}
1407 		substream->stream = direction;
1408 		substream->number = idx;
1409 		substream->rmidi = rmidi;
1410 		substream->pstr = stream;
1411 		list_add_tail(&substream->list, &stream->substreams);
1412 		stream->substream_count++;
1413 	}
1414 	return 0;
1415 }
1416 
1417 /**
1418  * snd_rawmidi_new - create a rawmidi instance
1419  * @card: the card instance
1420  * @id: the id string
1421  * @device: the device index
1422  * @output_count: the number of output streams
1423  * @input_count: the number of input streams
1424  * @rrawmidi: the pointer to store the new rawmidi instance
1425  *
1426  * Creates a new rawmidi instance.
1427  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1428  *
1429  * Returns zero if successful, or a negative error code on failure.
1430  */
1431 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1432 		    int output_count, int input_count,
1433 		    struct snd_rawmidi ** rrawmidi)
1434 {
1435 	struct snd_rawmidi *rmidi;
1436 	int err;
1437 	static struct snd_device_ops ops = {
1438 		.dev_free = snd_rawmidi_dev_free,
1439 		.dev_register = snd_rawmidi_dev_register,
1440 		.dev_disconnect = snd_rawmidi_dev_disconnect,
1441 	};
1442 
1443 	if (snd_BUG_ON(!card))
1444 		return -ENXIO;
1445 	if (rrawmidi)
1446 		*rrawmidi = NULL;
1447 	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1448 	if (rmidi == NULL) {
1449 		snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1450 		return -ENOMEM;
1451 	}
1452 	rmidi->card = card;
1453 	rmidi->device = device;
1454 	mutex_init(&rmidi->open_mutex);
1455 	init_waitqueue_head(&rmidi->open_wait);
1456 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1457 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1458 
1459 	if (id != NULL)
1460 		strlcpy(rmidi->id, id, sizeof(rmidi->id));
1461 	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1462 						&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1463 						SNDRV_RAWMIDI_STREAM_INPUT,
1464 						input_count)) < 0) {
1465 		snd_rawmidi_free(rmidi);
1466 		return err;
1467 	}
1468 	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1469 						&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1470 						SNDRV_RAWMIDI_STREAM_OUTPUT,
1471 						output_count)) < 0) {
1472 		snd_rawmidi_free(rmidi);
1473 		return err;
1474 	}
1475 	if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1476 		snd_rawmidi_free(rmidi);
1477 		return err;
1478 	}
1479 	if (rrawmidi)
1480 		*rrawmidi = rmidi;
1481 	return 0;
1482 }
1483 
1484 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1485 {
1486 	struct snd_rawmidi_substream *substream;
1487 
1488 	while (!list_empty(&stream->substreams)) {
1489 		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1490 		list_del(&substream->list);
1491 		kfree(substream);
1492 	}
1493 }
1494 
1495 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1496 {
1497 	if (!rmidi)
1498 		return 0;
1499 
1500 	snd_info_free_entry(rmidi->proc_entry);
1501 	rmidi->proc_entry = NULL;
1502 	mutex_lock(&register_mutex);
1503 	if (rmidi->ops && rmidi->ops->dev_unregister)
1504 		rmidi->ops->dev_unregister(rmidi);
1505 	mutex_unlock(&register_mutex);
1506 
1507 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1508 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1509 	if (rmidi->private_free)
1510 		rmidi->private_free(rmidi);
1511 	kfree(rmidi);
1512 	return 0;
1513 }
1514 
1515 static int snd_rawmidi_dev_free(struct snd_device *device)
1516 {
1517 	struct snd_rawmidi *rmidi = device->device_data;
1518 	return snd_rawmidi_free(rmidi);
1519 }
1520 
1521 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1522 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1523 {
1524 	struct snd_rawmidi *rmidi = device->private_data;
1525 	rmidi->seq_dev = NULL;
1526 }
1527 #endif
1528 
1529 static int snd_rawmidi_dev_register(struct snd_device *device)
1530 {
1531 	int err;
1532 	struct snd_info_entry *entry;
1533 	char name[16];
1534 	struct snd_rawmidi *rmidi = device->device_data;
1535 
1536 	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1537 		return -ENOMEM;
1538 	mutex_lock(&register_mutex);
1539 	if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1540 		mutex_unlock(&register_mutex);
1541 		return -EBUSY;
1542 	}
1543 	list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1544 	sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1545 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1546 				       rmidi->card, rmidi->device,
1547 				       &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1548 		snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1549 		list_del(&rmidi->list);
1550 		mutex_unlock(&register_mutex);
1551 		return err;
1552 	}
1553 	if (rmidi->ops && rmidi->ops->dev_register &&
1554 	    (err = rmidi->ops->dev_register(rmidi)) < 0) {
1555 		snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1556 		list_del(&rmidi->list);
1557 		mutex_unlock(&register_mutex);
1558 		return err;
1559 	}
1560 #ifdef CONFIG_SND_OSSEMUL
1561 	rmidi->ossreg = 0;
1562 	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1563 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1564 					    rmidi->card, 0, &snd_rawmidi_f_ops,
1565 					    rmidi, name) < 0) {
1566 			snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1567 		} else {
1568 			rmidi->ossreg++;
1569 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1570 			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1571 #endif
1572 		}
1573 	}
1574 	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1575 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1576 					    rmidi->card, 1, &snd_rawmidi_f_ops,
1577 					    rmidi, name) < 0) {
1578 			snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1579 		} else {
1580 			rmidi->ossreg++;
1581 		}
1582 	}
1583 #endif /* CONFIG_SND_OSSEMUL */
1584 	mutex_unlock(&register_mutex);
1585 	sprintf(name, "midi%d", rmidi->device);
1586 	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1587 	if (entry) {
1588 		entry->private_data = rmidi;
1589 		entry->c.text.read = snd_rawmidi_proc_info_read;
1590 		if (snd_info_register(entry) < 0) {
1591 			snd_info_free_entry(entry);
1592 			entry = NULL;
1593 		}
1594 	}
1595 	rmidi->proc_entry = entry;
1596 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1597 	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1598 		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1599 			rmidi->seq_dev->private_data = rmidi;
1600 			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1601 			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1602 			snd_device_register(rmidi->card, rmidi->seq_dev);
1603 		}
1604 	}
1605 #endif
1606 	return 0;
1607 }
1608 
1609 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1610 {
1611 	struct snd_rawmidi *rmidi = device->device_data;
1612 
1613 	mutex_lock(&register_mutex);
1614 	list_del_init(&rmidi->list);
1615 #ifdef CONFIG_SND_OSSEMUL
1616 	if (rmidi->ossreg) {
1617 		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1618 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1619 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1620 			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1621 #endif
1622 		}
1623 		if ((int)rmidi->device == amidi_map[rmidi->card->number])
1624 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1625 		rmidi->ossreg = 0;
1626 	}
1627 #endif /* CONFIG_SND_OSSEMUL */
1628 	snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1629 	mutex_unlock(&register_mutex);
1630 	return 0;
1631 }
1632 
1633 /**
1634  * snd_rawmidi_set_ops - set the rawmidi operators
1635  * @rmidi: the rawmidi instance
1636  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1637  * @ops: the operator table
1638  *
1639  * Sets the rawmidi operators for the given stream direction.
1640  */
1641 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1642 			 struct snd_rawmidi_ops *ops)
1643 {
1644 	struct snd_rawmidi_substream *substream;
1645 
1646 	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1647 		substream->ops = ops;
1648 }
1649 
1650 /*
1651  *  ENTRY functions
1652  */
1653 
1654 static int __init alsa_rawmidi_init(void)
1655 {
1656 
1657 	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1658 	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1659 #ifdef CONFIG_SND_OSSEMUL
1660 	{ int i;
1661 	/* check device map table */
1662 	for (i = 0; i < SNDRV_CARDS; i++) {
1663 		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1664 			snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1665 			midi_map[i] = 0;
1666 		}
1667 		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1668 			snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1669 			amidi_map[i] = 1;
1670 		}
1671 	}
1672 	}
1673 #endif /* CONFIG_SND_OSSEMUL */
1674 	return 0;
1675 }
1676 
1677 static void __exit alsa_rawmidi_exit(void)
1678 {
1679 	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1680 	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1681 }
1682 
1683 module_init(alsa_rawmidi_init)
1684 module_exit(alsa_rawmidi_exit)
1685 
1686 EXPORT_SYMBOL(snd_rawmidi_output_params);
1687 EXPORT_SYMBOL(snd_rawmidi_input_params);
1688 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1689 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1690 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1691 EXPORT_SYMBOL(snd_rawmidi_receive);
1692 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1695 EXPORT_SYMBOL(snd_rawmidi_transmit);
1696 EXPORT_SYMBOL(snd_rawmidi_new);
1697 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1698 EXPORT_SYMBOL(snd_rawmidi_info_select);
1699 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1700 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1702 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1703