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x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / sound / core / rawmidi.c
blobab890336175fbc022b2c641a857c258096b6b0f8
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/signal.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 #define rmidi_err(rmidi, fmt, args...) \
60 dev_err(&(rmidi)->dev, fmt, ##args)
61 #define rmidi_warn(rmidi, fmt, args...) \
62 dev_warn(&(rmidi)->dev, fmt, ##args)
63 #define rmidi_dbg(rmidi, fmt, args...) \
64 dev_dbg(&(rmidi)->dev, fmt, ##args)
65
66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
67 {
68 struct snd_rawmidi *rawmidi;
69
70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
71 if (rawmidi->card == card && rawmidi->device == device)
72 return rawmidi;
73 return NULL;
74 }
75
76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
77 {
78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
79 case FMODE_WRITE:
80 return SNDRV_RAWMIDI_LFLG_OUTPUT;
81 case FMODE_READ:
82 return SNDRV_RAWMIDI_LFLG_INPUT;
83 default:
84 return SNDRV_RAWMIDI_LFLG_OPEN;
85 }
86 }
87
88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
89 {
90 struct snd_rawmidi_runtime *runtime = substream->runtime;
91 return runtime->avail >= runtime->avail_min;
92 }
93
94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
95 size_t count)
96 {
97 struct snd_rawmidi_runtime *runtime = substream->runtime;
98 return runtime->avail >= runtime->avail_min &&
99 (!substream->append || runtime->avail >= count);
100 }
101
102 static void snd_rawmidi_input_event_work(struct work_struct *work)
103 {
104 struct snd_rawmidi_runtime *runtime =
105 container_of(work, struct snd_rawmidi_runtime, event_work);
106 if (runtime->event)
107 runtime->event(runtime->substream);
108 }
109
110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
111 {
112 struct snd_rawmidi_runtime *runtime;
113
114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
115 return -ENOMEM;
116 runtime->substream = substream;
117 spin_lock_init(&runtime->lock);
118 init_waitqueue_head(&runtime->sleep);
119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
120 runtime->event = NULL;
121 runtime->buffer_size = PAGE_SIZE;
122 runtime->avail_min = 1;
123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
124 runtime->avail = 0;
125 else
126 runtime->avail = runtime->buffer_size;
127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
128 kfree(runtime);
129 return -ENOMEM;
130 }
131 runtime->appl_ptr = runtime->hw_ptr = 0;
132 substream->runtime = runtime;
133 return 0;
134 }
135
136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
137 {
138 struct snd_rawmidi_runtime *runtime = substream->runtime;
139
140 kfree(runtime->buffer);
141 kfree(runtime);
142 substream->runtime = NULL;
143 return 0;
144 }
145
146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
147 {
148 if (!substream->opened)
149 return;
150 substream->ops->trigger(substream, up);
151 }
152
153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155 if (!substream->opened)
156 return;
157 substream->ops->trigger(substream, up);
158 if (!up)
159 cancel_work_sync(&substream->runtime->event_work);
160 }
161
162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
163 {
164 unsigned long flags;
165 struct snd_rawmidi_runtime *runtime = substream->runtime;
166
167 snd_rawmidi_output_trigger(substream, 0);
168 runtime->drain = 0;
169 spin_lock_irqsave(&runtime->lock, flags);
170 runtime->appl_ptr = runtime->hw_ptr = 0;
171 runtime->avail = runtime->buffer_size;
172 spin_unlock_irqrestore(&runtime->lock, flags);
173 return 0;
174 }
175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
178 {
179 int err;
180 long timeout;
181 struct snd_rawmidi_runtime *runtime = substream->runtime;
182
183 err = 0;
184 runtime->drain = 1;
185 timeout = wait_event_interruptible_timeout(runtime->sleep,
186 (runtime->avail >= runtime->buffer_size),
187 10*HZ);
188 if (signal_pending(current))
189 err = -ERESTARTSYS;
190 if (runtime->avail < runtime->buffer_size && !timeout) {
191 rmidi_warn(substream->rmidi,
192 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
193 (long)runtime->avail, (long)runtime->buffer_size);
194 err = -EIO;
195 }
196 runtime->drain = 0;
197 if (err != -ERESTARTSYS) {
198 /* we need wait a while to make sure that Tx FIFOs are empty */
199 if (substream->ops->drain)
200 substream->ops->drain(substream);
201 else
202 msleep(50);
203 snd_rawmidi_drop_output(substream);
204 }
205 return err;
206 }
207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210 {
211 unsigned long flags;
212 struct snd_rawmidi_runtime *runtime = substream->runtime;
213
214 snd_rawmidi_input_trigger(substream, 0);
215 runtime->drain = 0;
216 spin_lock_irqsave(&runtime->lock, flags);
217 runtime->appl_ptr = runtime->hw_ptr = 0;
218 runtime->avail = 0;
219 spin_unlock_irqrestore(&runtime->lock, flags);
220 return 0;
221 }
222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
223
224 /* look for an available substream for the given stream direction;
225 * if a specific subdevice is given, try to assign it
226 */
227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
228 int stream, int mode,
229 struct snd_rawmidi_substream **sub_ret)
230 {
231 struct snd_rawmidi_substream *substream;
232 struct snd_rawmidi_str *s = &rmidi->streams[stream];
233 static unsigned int info_flags[2] = {
234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
236 };
237
238 if (!(rmidi->info_flags & info_flags[stream]))
239 return -ENXIO;
240 if (subdevice >= 0 && subdevice >= s->substream_count)
241 return -ENODEV;
242
243 list_for_each_entry(substream, &s->substreams, list) {
244 if (substream->opened) {
245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
247 !substream->append)
248 continue;
249 }
250 if (subdevice < 0 || subdevice == substream->number) {
251 *sub_ret = substream;
252 return 0;
253 }
254 }
255 return -EAGAIN;
256 }
257
258 /* open and do ref-counting for the given substream */
259 static int open_substream(struct snd_rawmidi *rmidi,
260 struct snd_rawmidi_substream *substream,
261 int mode)
262 {
263 int err;
264
265 if (substream->use_count == 0) {
266 err = snd_rawmidi_runtime_create(substream);
267 if (err < 0)
268 return err;
269 err = substream->ops->open(substream);
270 if (err < 0) {
271 snd_rawmidi_runtime_free(substream);
272 return err;
273 }
274 substream->opened = 1;
275 substream->active_sensing = 0;
276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
277 substream->append = 1;
278 substream->pid = get_pid(task_pid(current));
279 rmidi->streams[substream->stream].substream_opened++;
280 }
281 substream->use_count++;
282 return 0;
283 }
284
285 static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
290 struct snd_rawmidi_file *rfile)
291 {
292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
293 int err;
294
295 rfile->input = rfile->output = NULL;
296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
297 err = assign_substream(rmidi, subdevice,
298 SNDRV_RAWMIDI_STREAM_INPUT,
299 mode, &sinput);
300 if (err < 0)
301 return err;
302 }
303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
304 err = assign_substream(rmidi, subdevice,
305 SNDRV_RAWMIDI_STREAM_OUTPUT,
306 mode, &soutput);
307 if (err < 0)
308 return err;
309 }
310
311 if (sinput) {
312 err = open_substream(rmidi, sinput, mode);
313 if (err < 0)
314 return err;
315 }
316 if (soutput) {
317 err = open_substream(rmidi, soutput, mode);
318 if (err < 0) {
319 if (sinput)
320 close_substream(rmidi, sinput, 0);
321 return err;
322 }
323 }
324
325 rfile->rmidi = rmidi;
326 rfile->input = sinput;
327 rfile->output = soutput;
328 return 0;
329 }
330
331 /* called from sound/core/seq/seq_midi.c */
332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
333 int mode, struct snd_rawmidi_file * rfile)
334 {
335 struct snd_rawmidi *rmidi;
336 int err;
337
338 if (snd_BUG_ON(!rfile))
339 return -EINVAL;
340
341 mutex_lock(&register_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(&register_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(&register_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(&register_mutex);
352
353 mutex_lock(&rmidi->open_mutex);
354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
355 mutex_unlock(&rmidi->open_mutex);
356 if (err < 0)
357 module_put(rmidi->card->module);
358 return err;
359 }
360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
363 {
364 int maj = imajor(inode);
365 struct snd_card *card;
366 int subdevice;
367 unsigned short fflags;
368 int err;
369 struct snd_rawmidi *rmidi;
370 struct snd_rawmidi_file *rawmidi_file = NULL;
371 wait_queue_t wait;
372
373 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
374 return -EINVAL; /* invalid combination */
375
376 err = nonseekable_open(inode, file);
377 if (err < 0)
378 return err;
379
380 if (maj == snd_major) {
381 rmidi = snd_lookup_minor_data(iminor(inode),
382 SNDRV_DEVICE_TYPE_RAWMIDI);
383 #ifdef CONFIG_SND_OSSEMUL
384 } else if (maj == SOUND_MAJOR) {
385 rmidi = snd_lookup_oss_minor_data(iminor(inode),
386 SNDRV_OSS_DEVICE_TYPE_MIDI);
387 #endif
388 } else
389 return -ENXIO;
390
391 if (rmidi == NULL)
392 return -ENODEV;
393
394 if (!try_module_get(rmidi->card->module)) {
395 snd_card_unref(rmidi->card);
396 return -ENXIO;
397 }
398
399 mutex_lock(&rmidi->open_mutex);
400 card = rmidi->card;
401 err = snd_card_file_add(card, file);
402 if (err < 0)
403 goto __error_card;
404 fflags = snd_rawmidi_file_flags(file);
405 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
406 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
407 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
408 if (rawmidi_file == NULL) {
409 err = -ENOMEM;
410 goto __error;
411 }
412 init_waitqueue_entry(&wait, current);
413 add_wait_queue(&rmidi->open_wait, &wait);
414 while (1) {
415 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
416 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
417 if (err >= 0)
418 break;
419 if (err == -EAGAIN) {
420 if (file->f_flags & O_NONBLOCK) {
421 err = -EBUSY;
422 break;
423 }
424 } else
425 break;
426 set_current_state(TASK_INTERRUPTIBLE);
427 mutex_unlock(&rmidi->open_mutex);
428 schedule();
429 mutex_lock(&rmidi->open_mutex);
430 if (rmidi->card->shutdown) {
431 err = -ENODEV;
432 break;
433 }
434 if (signal_pending(current)) {
435 err = -ERESTARTSYS;
436 break;
437 }
438 }
439 remove_wait_queue(&rmidi->open_wait, &wait);
440 if (err < 0) {
441 kfree(rawmidi_file);
442 goto __error;
443 }
444 #ifdef CONFIG_SND_OSSEMUL
445 if (rawmidi_file->input && rawmidi_file->input->runtime)
446 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
447 if (rawmidi_file->output && rawmidi_file->output->runtime)
448 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
449 #endif
450 file->private_data = rawmidi_file;
451 mutex_unlock(&rmidi->open_mutex);
452 snd_card_unref(rmidi->card);
453 return 0;
454
455 __error:
456 snd_card_file_remove(card, file);
457 __error_card:
458 mutex_unlock(&rmidi->open_mutex);
459 module_put(rmidi->card->module);
460 snd_card_unref(rmidi->card);
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 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
530
531 static int snd_rawmidi_release(struct inode *inode, struct file *file)
532 {
533 struct snd_rawmidi_file *rfile;
534 struct snd_rawmidi *rmidi;
535 struct module *module;
536
537 rfile = file->private_data;
538 rmidi = rfile->rmidi;
539 rawmidi_release_priv(rfile);
540 kfree(rfile);
541 module = rmidi->card->module;
542 snd_card_file_remove(rmidi->card, file);
543 module_put(module);
544 return 0;
545 }
546
547 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
548 struct snd_rawmidi_info *info)
549 {
550 struct snd_rawmidi *rmidi;
551
552 if (substream == NULL)
553 return -ENODEV;
554 rmidi = substream->rmidi;
555 memset(info, 0, sizeof(*info));
556 info->card = rmidi->card->number;
557 info->device = rmidi->device;
558 info->subdevice = substream->number;
559 info->stream = substream->stream;
560 info->flags = rmidi->info_flags;
561 strcpy(info->id, rmidi->id);
562 strcpy(info->name, rmidi->name);
563 strcpy(info->subname, substream->name);
564 info->subdevices_count = substream->pstr->substream_count;
565 info->subdevices_avail = (substream->pstr->substream_count -
566 substream->pstr->substream_opened);
567 return 0;
568 }
569
570 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
571 struct snd_rawmidi_info __user * _info)
572 {
573 struct snd_rawmidi_info info;
574 int err;
575 if ((err = snd_rawmidi_info(substream, &info)) < 0)
576 return err;
577 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
578 return -EFAULT;
579 return 0;
580 }
581
582 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
583 {
584 struct snd_rawmidi *rmidi;
585 struct snd_rawmidi_str *pstr;
586 struct snd_rawmidi_substream *substream;
587
588 mutex_lock(&register_mutex);
589 rmidi = snd_rawmidi_search(card, info->device);
590 mutex_unlock(&register_mutex);
591 if (!rmidi)
592 return -ENXIO;
593 if (info->stream < 0 || info->stream > 1)
594 return -EINVAL;
595 pstr = &rmidi->streams[info->stream];
596 if (pstr->substream_count == 0)
597 return -ENOENT;
598 if (info->subdevice >= pstr->substream_count)
599 return -ENXIO;
600 list_for_each_entry(substream, &pstr->substreams, list) {
601 if ((unsigned int)substream->number == info->subdevice)
602 return snd_rawmidi_info(substream, info);
603 }
604 return -ENXIO;
605 }
606 EXPORT_SYMBOL(snd_rawmidi_info_select);
607
608 static int snd_rawmidi_info_select_user(struct snd_card *card,
609 struct snd_rawmidi_info __user *_info)
610 {
611 int err;
612 struct snd_rawmidi_info info;
613 if (get_user(info.device, &_info->device))
614 return -EFAULT;
615 if (get_user(info.stream, &_info->stream))
616 return -EFAULT;
617 if (get_user(info.subdevice, &_info->subdevice))
618 return -EFAULT;
619 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
620 return err;
621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
622 return -EFAULT;
623 return 0;
624 }
625
626 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
627 struct snd_rawmidi_params * params)
628 {
629 char *newbuf;
630 struct snd_rawmidi_runtime *runtime = substream->runtime;
631
632 if (substream->append && substream->use_count > 1)
633 return -EBUSY;
634 snd_rawmidi_drain_output(substream);
635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
636 return -EINVAL;
637 }
638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
639 return -EINVAL;
640 }
641 if (params->buffer_size != runtime->buffer_size) {
642 newbuf = krealloc(runtime->buffer, params->buffer_size,
643 GFP_KERNEL);
644 if (!newbuf)
645 return -ENOMEM;
646 runtime->buffer = newbuf;
647 runtime->buffer_size = params->buffer_size;
648 runtime->avail = runtime->buffer_size;
649 }
650 runtime->avail_min = params->avail_min;
651 substream->active_sensing = !params->no_active_sensing;
652 return 0;
653 }
654 EXPORT_SYMBOL(snd_rawmidi_output_params);
655
656 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
657 struct snd_rawmidi_params * params)
658 {
659 char *newbuf;
660 struct snd_rawmidi_runtime *runtime = substream->runtime;
661
662 snd_rawmidi_drain_input(substream);
663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
664 return -EINVAL;
665 }
666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
667 return -EINVAL;
668 }
669 if (params->buffer_size != runtime->buffer_size) {
670 newbuf = krealloc(runtime->buffer, params->buffer_size,
671 GFP_KERNEL);
672 if (!newbuf)
673 return -ENOMEM;
674 runtime->buffer = newbuf;
675 runtime->buffer_size = params->buffer_size;
676 }
677 runtime->avail_min = params->avail_min;
678 return 0;
679 }
680 EXPORT_SYMBOL(snd_rawmidi_input_params);
681
682 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683 struct snd_rawmidi_status * status)
684 {
685 struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687 memset(status, 0, sizeof(*status));
688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693 }
694
695 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696 struct snd_rawmidi_status * status)
697 {
698 struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700 memset(status, 0, sizeof(*status));
701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702 spin_lock_irq(&runtime->lock);
703 status->avail = runtime->avail;
704 status->xruns = runtime->xruns;
705 runtime->xruns = 0;
706 spin_unlock_irq(&runtime->lock);
707 return 0;
708 }
709
710 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711 {
712 struct snd_rawmidi_file *rfile;
713 void __user *argp = (void __user *)arg;
714
715 rfile = file->private_data;
716 if (((cmd >> 8) & 0xff) != 'W')
717 return -ENOTTY;
718 switch (cmd) {
719 case SNDRV_RAWMIDI_IOCTL_PVERSION:
720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721 case SNDRV_RAWMIDI_IOCTL_INFO:
722 {
723 int stream;
724 struct snd_rawmidi_info __user *info = argp;
725 if (get_user(stream, &info->stream))
726 return -EFAULT;
727 switch (stream) {
728 case SNDRV_RAWMIDI_STREAM_INPUT:
729 return snd_rawmidi_info_user(rfile->input, info);
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 return snd_rawmidi_info_user(rfile->output, info);
732 default:
733 return -EINVAL;
734 }
735 }
736 case SNDRV_RAWMIDI_IOCTL_PARAMS:
737 {
738 struct snd_rawmidi_params params;
739 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
740 return -EFAULT;
741 switch (params.stream) {
742 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743 if (rfile->output == NULL)
744 return -EINVAL;
745 return snd_rawmidi_output_params(rfile->output, &params);
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 return snd_rawmidi_input_params(rfile->input, &params);
750 default:
751 return -EINVAL;
752 }
753 }
754 case SNDRV_RAWMIDI_IOCTL_STATUS:
755 {
756 int err = 0;
757 struct snd_rawmidi_status status;
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759 return -EFAULT;
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
763 return -EINVAL;
764 err = snd_rawmidi_output_status(rfile->output, &status);
765 break;
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
768 return -EINVAL;
769 err = snd_rawmidi_input_status(rfile->input, &status);
770 break;
771 default:
772 return -EINVAL;
773 }
774 if (err < 0)
775 return err;
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
783 if (get_user(val, (int __user *) argp))
784 return -EFAULT;
785 switch (val) {
786 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787 if (rfile->output == NULL)
788 return -EINVAL;
789 return snd_rawmidi_drop_output(rfile->output);
790 default:
791 return -EINVAL;
792 }
793 }
794 case SNDRV_RAWMIDI_IOCTL_DRAIN:
795 {
796 int val;
797 if (get_user(val, (int __user *) argp))
798 return -EFAULT;
799 switch (val) {
800 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801 if (rfile->output == NULL)
802 return -EINVAL;
803 return snd_rawmidi_drain_output(rfile->output);
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 return snd_rawmidi_drain_input(rfile->input);
808 default:
809 return -EINVAL;
810 }
811 }
812 default:
813 rmidi_dbg(rfile->rmidi,
814 "rawmidi: unknown command = 0x%x\n", cmd);
815 }
816 return -ENOTTY;
817 }
818
819 static int snd_rawmidi_control_ioctl(struct snd_card *card,
820 struct snd_ctl_file *control,
821 unsigned int cmd,
822 unsigned long arg)
823 {
824 void __user *argp = (void __user *)arg;
825
826 switch (cmd) {
827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
828 {
829 int device;
830
831 if (get_user(device, (int __user *)argp))
832 return -EFAULT;
833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
834 device = SNDRV_RAWMIDI_DEVICES - 1;
835 mutex_lock(&register_mutex);
836 device = device < 0 ? 0 : device + 1;
837 while (device < SNDRV_RAWMIDI_DEVICES) {
838 if (snd_rawmidi_search(card, device))
839 break;
840 device++;
841 }
842 if (device == SNDRV_RAWMIDI_DEVICES)
843 device = -1;
844 mutex_unlock(&register_mutex);
845 if (put_user(device, (int __user *)argp))
846 return -EFAULT;
847 return 0;
848 }
849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
850 {
851 int val;
852
853 if (get_user(val, (int __user *)argp))
854 return -EFAULT;
855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
859 return snd_rawmidi_info_select_user(card, argp);
860 }
861 return -ENOIOCTLCMD;
862 }
863
864 /**
865 * snd_rawmidi_receive - receive the input data from the device
866 * @substream: the rawmidi substream
867 * @buffer: the buffer pointer
868 * @count: the data size to read
869 *
870 * Reads the data from the internal buffer.
871 *
872 * Return: The size of read data, or a negative error code on failure.
873 */
874 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
875 const unsigned char *buffer, int count)
876 {
877 unsigned long flags;
878 int result = 0, count1;
879 struct snd_rawmidi_runtime *runtime = substream->runtime;
880
881 if (!substream->opened)
882 return -EBADFD;
883 if (runtime->buffer == NULL) {
884 rmidi_dbg(substream->rmidi,
885 "snd_rawmidi_receive: input is not active!!!\n");
886 return -EINVAL;
887 }
888 spin_lock_irqsave(&runtime->lock, flags);
889 if (count == 1) { /* special case, faster code */
890 substream->bytes++;
891 if (runtime->avail < runtime->buffer_size) {
892 runtime->buffer[runtime->hw_ptr++] = buffer[0];
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail++;
895 result++;
896 } else {
897 runtime->xruns++;
898 }
899 } else {
900 substream->bytes += count;
901 count1 = runtime->buffer_size - runtime->hw_ptr;
902 if (count1 > count)
903 count1 = count;
904 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905 count1 = runtime->buffer_size - runtime->avail;
906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907 runtime->hw_ptr += count1;
908 runtime->hw_ptr %= runtime->buffer_size;
909 runtime->avail += count1;
910 count -= count1;
911 result += count1;
912 if (count > 0) {
913 buffer += count1;
914 count1 = count;
915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916 count1 = runtime->buffer_size - runtime->avail;
917 runtime->xruns += count - count1;
918 }
919 if (count1 > 0) {
920 memcpy(runtime->buffer, buffer, count1);
921 runtime->hw_ptr = count1;
922 runtime->avail += count1;
923 result += count1;
924 }
925 }
926 }
927 if (result > 0) {
928 if (runtime->event)
929 schedule_work(&runtime->event_work);
930 else if (snd_rawmidi_ready(substream))
931 wake_up(&runtime->sleep);
932 }
933 spin_unlock_irqrestore(&runtime->lock, flags);
934 return result;
935 }
936 EXPORT_SYMBOL(snd_rawmidi_receive);
937
938 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
939 unsigned char __user *userbuf,
940 unsigned char *kernelbuf, long count)
941 {
942 unsigned long flags;
943 long result = 0, count1;
944 struct snd_rawmidi_runtime *runtime = substream->runtime;
945 unsigned long appl_ptr;
946
947 spin_lock_irqsave(&runtime->lock, flags);
948 while (count > 0 && runtime->avail) {
949 count1 = runtime->buffer_size - runtime->appl_ptr;
950 if (count1 > count)
951 count1 = count;
952 if (count1 > (int)runtime->avail)
953 count1 = runtime->avail;
954
955 /* update runtime->appl_ptr before unlocking for userbuf */
956 appl_ptr = runtime->appl_ptr;
957 runtime->appl_ptr += count1;
958 runtime->appl_ptr %= runtime->buffer_size;
959 runtime->avail -= count1;
960
961 if (kernelbuf)
962 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
963 if (userbuf) {
964 spin_unlock_irqrestore(&runtime->lock, flags);
965 if (copy_to_user(userbuf + result,
966 runtime->buffer + appl_ptr, count1)) {
967 return result > 0 ? result : -EFAULT;
968 }
969 spin_lock_irqsave(&runtime->lock, flags);
970 }
971 result += count1;
972 count -= count1;
973 }
974 spin_unlock_irqrestore(&runtime->lock, flags);
975 return result;
976 }
977
978 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
979 unsigned char *buf, long count)
980 {
981 snd_rawmidi_input_trigger(substream, 1);
982 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
983 }
984 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
985
986 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
987 loff_t *offset)
988 {
989 long result;
990 int count1;
991 struct snd_rawmidi_file *rfile;
992 struct snd_rawmidi_substream *substream;
993 struct snd_rawmidi_runtime *runtime;
994
995 rfile = file->private_data;
996 substream = rfile->input;
997 if (substream == NULL)
998 return -EIO;
999 runtime = substream->runtime;
1000 snd_rawmidi_input_trigger(substream, 1);
1001 result = 0;
1002 while (count > 0) {
1003 spin_lock_irq(&runtime->lock);
1004 while (!snd_rawmidi_ready(substream)) {
1005 wait_queue_t wait;
1006 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1007 spin_unlock_irq(&runtime->lock);
1008 return result > 0 ? result : -EAGAIN;
1009 }
1010 init_waitqueue_entry(&wait, current);
1011 add_wait_queue(&runtime->sleep, &wait);
1012 set_current_state(TASK_INTERRUPTIBLE);
1013 spin_unlock_irq(&runtime->lock);
1014 schedule();
1015 remove_wait_queue(&runtime->sleep, &wait);
1016 if (rfile->rmidi->card->shutdown)
1017 return -ENODEV;
1018 if (signal_pending(current))
1019 return result > 0 ? result : -ERESTARTSYS;
1020 if (!runtime->avail)
1021 return result > 0 ? result : -EIO;
1022 spin_lock_irq(&runtime->lock);
1023 }
1024 spin_unlock_irq(&runtime->lock);
1025 count1 = snd_rawmidi_kernel_read1(substream,
1026 (unsigned char __user *)buf,
1027 NULL/*kernelbuf*/,
1028 count);
1029 if (count1 < 0)
1030 return result > 0 ? result : count1;
1031 result += count1;
1032 buf += count1;
1033 count -= count1;
1034 }
1035 return result;
1036 }
1037
1038 /**
1039 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1040 * @substream: the rawmidi substream
1041 *
1042 * Return: 1 if the internal output buffer is empty, 0 if not.
1043 */
1044 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1045 {
1046 struct snd_rawmidi_runtime *runtime = substream->runtime;
1047 int result;
1048 unsigned long flags;
1049
1050 if (runtime->buffer == NULL) {
1051 rmidi_dbg(substream->rmidi,
1052 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1053 return 1;
1054 }
1055 spin_lock_irqsave(&runtime->lock, flags);
1056 result = runtime->avail >= runtime->buffer_size;
1057 spin_unlock_irqrestore(&runtime->lock, flags);
1058 return result;
1059 }
1060 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1061
1062 /**
1063 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1064 * @substream: the rawmidi substream
1065 * @buffer: the buffer pointer
1066 * @count: data size to transfer
1067 *
1068 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1069 */
1070 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071 unsigned char *buffer, int count)
1072 {
1073 int result, count1;
1074 struct snd_rawmidi_runtime *runtime = substream->runtime;
1075
1076 if (runtime->buffer == NULL) {
1077 rmidi_dbg(substream->rmidi,
1078 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1079 return -EINVAL;
1080 }
1081 result = 0;
1082 if (runtime->avail >= runtime->buffer_size) {
1083 /* warning: lowlevel layer MUST trigger down the hardware */
1084 goto __skip;
1085 }
1086 if (count == 1) { /* special case, faster code */
1087 *buffer = runtime->buffer[runtime->hw_ptr];
1088 result++;
1089 } else {
1090 count1 = runtime->buffer_size - runtime->hw_ptr;
1091 if (count1 > count)
1092 count1 = count;
1093 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1094 count1 = runtime->buffer_size - runtime->avail;
1095 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1096 count -= count1;
1097 result += count1;
1098 if (count > 0) {
1099 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1100 count = runtime->buffer_size - runtime->avail - count1;
1101 memcpy(buffer + count1, runtime->buffer, count);
1102 result += count;
1103 }
1104 }
1105 __skip:
1106 return result;
1107 }
1108 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1109
1110 /**
1111 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1112 * @substream: the rawmidi substream
1113 * @buffer: the buffer pointer
1114 * @count: data size to transfer
1115 *
1116 * Copies data from the internal output buffer to the given buffer.
1117 *
1118 * Call this in the interrupt handler when the midi output is ready,
1119 * and call snd_rawmidi_transmit_ack() after the transmission is
1120 * finished.
1121 *
1122 * Return: The size of copied data, or a negative error code on failure.
1123 */
1124 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1125 unsigned char *buffer, int count)
1126 {
1127 struct snd_rawmidi_runtime *runtime = substream->runtime;
1128 int result;
1129 unsigned long flags;
1130
1131 spin_lock_irqsave(&runtime->lock, flags);
1132 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1133 spin_unlock_irqrestore(&runtime->lock, flags);
1134 return result;
1135 }
1136 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1137
1138 /**
1139 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1140 * @substream: the rawmidi substream
1141 * @count: the transferred count
1142 *
1143 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1144 */
1145 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1146 {
1147 struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149 if (runtime->buffer == NULL) {
1150 rmidi_dbg(substream->rmidi,
1151 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1152 return -EINVAL;
1153 }
1154 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1155 runtime->hw_ptr += count;
1156 runtime->hw_ptr %= runtime->buffer_size;
1157 runtime->avail += count;
1158 substream->bytes += count;
1159 if (count > 0) {
1160 if (runtime->drain || snd_rawmidi_ready(substream))
1161 wake_up(&runtime->sleep);
1162 }
1163 return count;
1164 }
1165 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1166
1167 /**
1168 * snd_rawmidi_transmit_ack - acknowledge the transmission
1169 * @substream: the rawmidi substream
1170 * @count: the transferred count
1171 *
1172 * Advances the hardware pointer for the internal output buffer with
1173 * the given size and updates the condition.
1174 * Call after the transmission is finished.
1175 *
1176 * Return: The advanced size if successful, or a negative error code on failure.
1177 */
1178 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1179 {
1180 struct snd_rawmidi_runtime *runtime = substream->runtime;
1181 int result;
1182 unsigned long flags;
1183
1184 spin_lock_irqsave(&runtime->lock, flags);
1185 result = __snd_rawmidi_transmit_ack(substream, count);
1186 spin_unlock_irqrestore(&runtime->lock, flags);
1187 return result;
1188 }
1189 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1190
1191 /**
1192 * snd_rawmidi_transmit - copy from the buffer to the device
1193 * @substream: the rawmidi substream
1194 * @buffer: the buffer pointer
1195 * @count: the data size to transfer
1196 *
1197 * Copies data from the buffer to the device and advances the pointer.
1198 *
1199 * Return: The copied size if successful, or a negative error code on failure.
1200 */
1201 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1202 unsigned char *buffer, int count)
1203 {
1204 struct snd_rawmidi_runtime *runtime = substream->runtime;
1205 int result;
1206 unsigned long flags;
1207
1208 spin_lock_irqsave(&runtime->lock, flags);
1209 if (!substream->opened)
1210 result = -EBADFD;
1211 else {
1212 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1213 if (count <= 0)
1214 result = count;
1215 else
1216 result = __snd_rawmidi_transmit_ack(substream, count);
1217 }
1218 spin_unlock_irqrestore(&runtime->lock, flags);
1219 return result;
1220 }
1221 EXPORT_SYMBOL(snd_rawmidi_transmit);
1222
1223 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1224 const unsigned char __user *userbuf,
1225 const unsigned char *kernelbuf,
1226 long count)
1227 {
1228 unsigned long flags;
1229 long count1, result;
1230 struct snd_rawmidi_runtime *runtime = substream->runtime;
1231 unsigned long appl_ptr;
1232
1233 if (!kernelbuf && !userbuf)
1234 return -EINVAL;
1235 if (snd_BUG_ON(!runtime->buffer))
1236 return -EINVAL;
1237
1238 result = 0;
1239 spin_lock_irqsave(&runtime->lock, flags);
1240 if (substream->append) {
1241 if ((long)runtime->avail < count) {
1242 spin_unlock_irqrestore(&runtime->lock, flags);
1243 return -EAGAIN;
1244 }
1245 }
1246 while (count > 0 && runtime->avail > 0) {
1247 count1 = runtime->buffer_size - runtime->appl_ptr;
1248 if (count1 > count)
1249 count1 = count;
1250 if (count1 > (long)runtime->avail)
1251 count1 = runtime->avail;
1252
1253 /* update runtime->appl_ptr before unlocking for userbuf */
1254 appl_ptr = runtime->appl_ptr;
1255 runtime->appl_ptr += count1;
1256 runtime->appl_ptr %= runtime->buffer_size;
1257 runtime->avail -= count1;
1258
1259 if (kernelbuf)
1260 memcpy(runtime->buffer + appl_ptr,
1261 kernelbuf + result, count1);
1262 else if (userbuf) {
1263 spin_unlock_irqrestore(&runtime->lock, flags);
1264 if (copy_from_user(runtime->buffer + appl_ptr,
1265 userbuf + result, count1)) {
1266 spin_lock_irqsave(&runtime->lock, flags);
1267 result = result > 0 ? result : -EFAULT;
1268 goto __end;
1269 }
1270 spin_lock_irqsave(&runtime->lock, flags);
1271 }
1272 result += count1;
1273 count -= count1;
1274 }
1275 __end:
1276 count1 = runtime->avail < runtime->buffer_size;
1277 spin_unlock_irqrestore(&runtime->lock, flags);
1278 if (count1)
1279 snd_rawmidi_output_trigger(substream, 1);
1280 return result;
1281 }
1282
1283 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1284 const unsigned char *buf, long count)
1285 {
1286 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1287 }
1288 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1289
1290 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1291 size_t count, loff_t *offset)
1292 {
1293 long result, timeout;
1294 int count1;
1295 struct snd_rawmidi_file *rfile;
1296 struct snd_rawmidi_runtime *runtime;
1297 struct snd_rawmidi_substream *substream;
1298
1299 rfile = file->private_data;
1300 substream = rfile->output;
1301 runtime = substream->runtime;
1302 /* we cannot put an atomic message to our buffer */
1303 if (substream->append && count > runtime->buffer_size)
1304 return -EIO;
1305 result = 0;
1306 while (count > 0) {
1307 spin_lock_irq(&runtime->lock);
1308 while (!snd_rawmidi_ready_append(substream, count)) {
1309 wait_queue_t wait;
1310 if (file->f_flags & O_NONBLOCK) {
1311 spin_unlock_irq(&runtime->lock);
1312 return result > 0 ? result : -EAGAIN;
1313 }
1314 init_waitqueue_entry(&wait, current);
1315 add_wait_queue(&runtime->sleep, &wait);
1316 set_current_state(TASK_INTERRUPTIBLE);
1317 spin_unlock_irq(&runtime->lock);
1318 timeout = schedule_timeout(30 * HZ);
1319 remove_wait_queue(&runtime->sleep, &wait);
1320 if (rfile->rmidi->card->shutdown)
1321 return -ENODEV;
1322 if (signal_pending(current))
1323 return result > 0 ? result : -ERESTARTSYS;
1324 if (!runtime->avail && !timeout)
1325 return result > 0 ? result : -EIO;
1326 spin_lock_irq(&runtime->lock);
1327 }
1328 spin_unlock_irq(&runtime->lock);
1329 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1330 if (count1 < 0)
1331 return result > 0 ? result : count1;
1332 result += count1;
1333 buf += count1;
1334 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1335 break;
1336 count -= count1;
1337 }
1338 if (file->f_flags & O_DSYNC) {
1339 spin_lock_irq(&runtime->lock);
1340 while (runtime->avail != runtime->buffer_size) {
1341 wait_queue_t wait;
1342 unsigned int last_avail = runtime->avail;
1343 init_waitqueue_entry(&wait, current);
1344 add_wait_queue(&runtime->sleep, &wait);
1345 set_current_state(TASK_INTERRUPTIBLE);
1346 spin_unlock_irq(&runtime->lock);
1347 timeout = schedule_timeout(30 * HZ);
1348 remove_wait_queue(&runtime->sleep, &wait);
1349 if (signal_pending(current))
1350 return result > 0 ? result : -ERESTARTSYS;
1351 if (runtime->avail == last_avail && !timeout)
1352 return result > 0 ? result : -EIO;
1353 spin_lock_irq(&runtime->lock);
1354 }
1355 spin_unlock_irq(&runtime->lock);
1356 }
1357 return result;
1358 }
1359
1360 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1361 {
1362 struct snd_rawmidi_file *rfile;
1363 struct snd_rawmidi_runtime *runtime;
1364 unsigned int mask;
1365
1366 rfile = file->private_data;
1367 if (rfile->input != NULL) {
1368 runtime = rfile->input->runtime;
1369 snd_rawmidi_input_trigger(rfile->input, 1);
1370 poll_wait(file, &runtime->sleep, wait);
1371 }
1372 if (rfile->output != NULL) {
1373 runtime = rfile->output->runtime;
1374 poll_wait(file, &runtime->sleep, wait);
1375 }
1376 mask = 0;
1377 if (rfile->input != NULL) {
1378 if (snd_rawmidi_ready(rfile->input))
1379 mask |= POLLIN | POLLRDNORM;
1380 }
1381 if (rfile->output != NULL) {
1382 if (snd_rawmidi_ready(rfile->output))
1383 mask |= POLLOUT | POLLWRNORM;
1384 }
1385 return mask;
1386 }
1387
1388 /*
1389 */
1390 #ifdef CONFIG_COMPAT
1391 #include "rawmidi_compat.c"
1392 #else
1393 #define snd_rawmidi_ioctl_compat NULL
1394 #endif
1395
1396 /*
1397
1398 */
1399
1400 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1401 struct snd_info_buffer *buffer)
1402 {
1403 struct snd_rawmidi *rmidi;
1404 struct snd_rawmidi_substream *substream;
1405 struct snd_rawmidi_runtime *runtime;
1406
1407 rmidi = entry->private_data;
1408 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1409 mutex_lock(&rmidi->open_mutex);
1410 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1411 list_for_each_entry(substream,
1412 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1413 list) {
1414 snd_iprintf(buffer,
1415 "Output %d\n"
1416 " Tx bytes : %lu\n",
1417 substream->number,
1418 (unsigned long) substream->bytes);
1419 if (substream->opened) {
1420 snd_iprintf(buffer,
1421 " Owner PID : %d\n",
1422 pid_vnr(substream->pid));
1423 runtime = substream->runtime;
1424 snd_iprintf(buffer,
1425 " Mode : %s\n"
1426 " Buffer size : %lu\n"
1427 " Avail : %lu\n",
1428 runtime->oss ? "OSS compatible" : "native",
1429 (unsigned long) runtime->buffer_size,
1430 (unsigned long) runtime->avail);
1431 }
1432 }
1433 }
1434 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1435 list_for_each_entry(substream,
1436 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1437 list) {
1438 snd_iprintf(buffer,
1439 "Input %d\n"
1440 " Rx bytes : %lu\n",
1441 substream->number,
1442 (unsigned long) substream->bytes);
1443 if (substream->opened) {
1444 snd_iprintf(buffer,
1445 " Owner PID : %d\n",
1446 pid_vnr(substream->pid));
1447 runtime = substream->runtime;
1448 snd_iprintf(buffer,
1449 " Buffer size : %lu\n"
1450 " Avail : %lu\n"
1451 " Overruns : %lu\n",
1452 (unsigned long) runtime->buffer_size,
1453 (unsigned long) runtime->avail,
1454 (unsigned long) runtime->xruns);
1455 }
1456 }
1457 }
1458 mutex_unlock(&rmidi->open_mutex);
1459 }
1460
1461 /*
1462 * Register functions
1463 */
1464
1465 static const struct file_operations snd_rawmidi_f_ops =
1466 {
1467 .owner = THIS_MODULE,
1468 .read = snd_rawmidi_read,
1469 .write = snd_rawmidi_write,
1470 .open = snd_rawmidi_open,
1471 .release = snd_rawmidi_release,
1472 .llseek = no_llseek,
1473 .poll = snd_rawmidi_poll,
1474 .unlocked_ioctl = snd_rawmidi_ioctl,
1475 .compat_ioctl = snd_rawmidi_ioctl_compat,
1476 };
1477
1478 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1479 struct snd_rawmidi_str *stream,
1480 int direction,
1481 int count)
1482 {
1483 struct snd_rawmidi_substream *substream;
1484 int idx;
1485
1486 for (idx = 0; idx < count; idx++) {
1487 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1488 if (!substream)
1489 return -ENOMEM;
1490 substream->stream = direction;
1491 substream->number = idx;
1492 substream->rmidi = rmidi;
1493 substream->pstr = stream;
1494 list_add_tail(&substream->list, &stream->substreams);
1495 stream->substream_count++;
1496 }
1497 return 0;
1498 }
1499
1500 static void release_rawmidi_device(struct device *dev)
1501 {
1502 kfree(container_of(dev, struct snd_rawmidi, dev));
1503 }
1504
1505 /**
1506 * snd_rawmidi_new - create a rawmidi instance
1507 * @card: the card instance
1508 * @id: the id string
1509 * @device: the device index
1510 * @output_count: the number of output streams
1511 * @input_count: the number of input streams
1512 * @rrawmidi: the pointer to store the new rawmidi instance
1513 *
1514 * Creates a new rawmidi instance.
1515 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1516 *
1517 * Return: Zero if successful, or a negative error code on failure.
1518 */
1519 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1520 int output_count, int input_count,
1521 struct snd_rawmidi ** rrawmidi)
1522 {
1523 struct snd_rawmidi *rmidi;
1524 int err;
1525 static struct snd_device_ops ops = {
1526 .dev_free = snd_rawmidi_dev_free,
1527 .dev_register = snd_rawmidi_dev_register,
1528 .dev_disconnect = snd_rawmidi_dev_disconnect,
1529 };
1530
1531 if (snd_BUG_ON(!card))
1532 return -ENXIO;
1533 if (rrawmidi)
1534 *rrawmidi = NULL;
1535 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1536 if (!rmidi)
1537 return -ENOMEM;
1538 rmidi->card = card;
1539 rmidi->device = device;
1540 mutex_init(&rmidi->open_mutex);
1541 init_waitqueue_head(&rmidi->open_wait);
1542 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1543 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1544
1545 if (id != NULL)
1546 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1547
1548 snd_device_initialize(&rmidi->dev, card);
1549 rmidi->dev.release = release_rawmidi_device;
1550 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1551
1552 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1553 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1554 SNDRV_RAWMIDI_STREAM_INPUT,
1555 input_count)) < 0) {
1556 snd_rawmidi_free(rmidi);
1557 return err;
1558 }
1559 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1560 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1561 SNDRV_RAWMIDI_STREAM_OUTPUT,
1562 output_count)) < 0) {
1563 snd_rawmidi_free(rmidi);
1564 return err;
1565 }
1566 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1567 snd_rawmidi_free(rmidi);
1568 return err;
1569 }
1570 if (rrawmidi)
1571 *rrawmidi = rmidi;
1572 return 0;
1573 }
1574 EXPORT_SYMBOL(snd_rawmidi_new);
1575
1576 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1577 {
1578 struct snd_rawmidi_substream *substream;
1579
1580 while (!list_empty(&stream->substreams)) {
1581 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1582 list_del(&substream->list);
1583 kfree(substream);
1584 }
1585 }
1586
1587 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1588 {
1589 if (!rmidi)
1590 return 0;
1591
1592 snd_info_free_entry(rmidi->proc_entry);
1593 rmidi->proc_entry = NULL;
1594 mutex_lock(&register_mutex);
1595 if (rmidi->ops && rmidi->ops->dev_unregister)
1596 rmidi->ops->dev_unregister(rmidi);
1597 mutex_unlock(&register_mutex);
1598
1599 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1600 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1601 if (rmidi->private_free)
1602 rmidi->private_free(rmidi);
1603 put_device(&rmidi->dev);
1604 return 0;
1605 }
1606
1607 static int snd_rawmidi_dev_free(struct snd_device *device)
1608 {
1609 struct snd_rawmidi *rmidi = device->device_data;
1610 return snd_rawmidi_free(rmidi);
1611 }
1612
1613 #if IS_REACHABLE(CONFIG_SND_SEQUENCER)
1614 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1615 {
1616 struct snd_rawmidi *rmidi = device->private_data;
1617 rmidi->seq_dev = NULL;
1618 }
1619 #endif
1620
1621 static int snd_rawmidi_dev_register(struct snd_device *device)
1622 {
1623 int err;
1624 struct snd_info_entry *entry;
1625 char name[16];
1626 struct snd_rawmidi *rmidi = device->device_data;
1627
1628 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1629 return -ENOMEM;
1630 mutex_lock(&register_mutex);
1631 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1632 mutex_unlock(&register_mutex);
1633 return -EBUSY;
1634 }
1635 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1636 mutex_unlock(&register_mutex);
1637 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1638 rmidi->card, rmidi->device,
1639 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1640 if (err < 0) {
1641 rmidi_err(rmidi, "unable to register\n");
1642 mutex_lock(&register_mutex);
1643 list_del(&rmidi->list);
1644 mutex_unlock(&register_mutex);
1645 return err;
1646 }
1647 if (rmidi->ops && rmidi->ops->dev_register &&
1648 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1649 snd_unregister_device(&rmidi->dev);
1650 mutex_lock(&register_mutex);
1651 list_del(&rmidi->list);
1652 mutex_unlock(&register_mutex);
1653 return err;
1654 }
1655 #ifdef CONFIG_SND_OSSEMUL
1656 rmidi->ossreg = 0;
1657 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1658 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1659 rmidi->card, 0, &snd_rawmidi_f_ops,
1660 rmidi) < 0) {
1661 rmidi_err(rmidi,
1662 "unable to register OSS rawmidi device %i:%i\n",
1663 rmidi->card->number, 0);
1664 } else {
1665 rmidi->ossreg++;
1666 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1667 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1668 #endif
1669 }
1670 }
1671 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1672 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1673 rmidi->card, 1, &snd_rawmidi_f_ops,
1674 rmidi) < 0) {
1675 rmidi_err(rmidi,
1676 "unable to register OSS rawmidi device %i:%i\n",
1677 rmidi->card->number, 1);
1678 } else {
1679 rmidi->ossreg++;
1680 }
1681 }
1682 #endif /* CONFIG_SND_OSSEMUL */
1683 sprintf(name, "midi%d", rmidi->device);
1684 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1685 if (entry) {
1686 entry->private_data = rmidi;
1687 entry->c.text.read = snd_rawmidi_proc_info_read;
1688 if (snd_info_register(entry) < 0) {
1689 snd_info_free_entry(entry);
1690 entry = NULL;
1691 }
1692 }
1693 rmidi->proc_entry = entry;
1694 #if IS_REACHABLE(CONFIG_SND_SEQUENCER)
1695 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1696 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1697 rmidi->seq_dev->private_data = rmidi;
1698 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1699 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1700 snd_device_register(rmidi->card, rmidi->seq_dev);
1701 }
1702 }
1703 #endif
1704 return 0;
1705 }
1706
1707 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1708 {
1709 struct snd_rawmidi *rmidi = device->device_data;
1710 int dir;
1711
1712 mutex_lock(&register_mutex);
1713 mutex_lock(&rmidi->open_mutex);
1714 wake_up(&rmidi->open_wait);
1715 list_del_init(&rmidi->list);
1716 for (dir = 0; dir < 2; dir++) {
1717 struct snd_rawmidi_substream *s;
1718 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1719 if (s->runtime)
1720 wake_up(&s->runtime->sleep);
1721 }
1722 }
1723
1724 #ifdef CONFIG_SND_OSSEMUL
1725 if (rmidi->ossreg) {
1726 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1727 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1728 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1729 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1730 #endif
1731 }
1732 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1733 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1734 rmidi->ossreg = 0;
1735 }
1736 #endif /* CONFIG_SND_OSSEMUL */
1737 snd_unregister_device(&rmidi->dev);
1738 mutex_unlock(&rmidi->open_mutex);
1739 mutex_unlock(&register_mutex);
1740 return 0;
1741 }
1742
1743 /**
1744 * snd_rawmidi_set_ops - set the rawmidi operators
1745 * @rmidi: the rawmidi instance
1746 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1747 * @ops: the operator table
1748 *
1749 * Sets the rawmidi operators for the given stream direction.
1750 */
1751 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1752 const struct snd_rawmidi_ops *ops)
1753 {
1754 struct snd_rawmidi_substream *substream;
1755
1756 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1757 substream->ops = ops;
1758 }
1759 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1760
1761 /*
1762 * ENTRY functions
1763 */
1764
1765 static int __init alsa_rawmidi_init(void)
1766 {
1767
1768 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1769 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1770 #ifdef CONFIG_SND_OSSEMUL
1771 { int i;
1772 /* check device map table */
1773 for (i = 0; i < SNDRV_CARDS; i++) {
1774 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1775 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1776 i, midi_map[i]);
1777 midi_map[i] = 0;
1778 }
1779 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1780 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1781 i, amidi_map[i]);
1782 amidi_map[i] = 1;
1783 }
1784 }
1785 }
1786 #endif /* CONFIG_SND_OSSEMUL */
1787 return 0;
1788 }
1789
1790 static void __exit alsa_rawmidi_exit(void)
1791 {
1792 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1793 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1794 }
1795
1796 module_init(alsa_rawmidi_init)
1797 module_exit(alsa_rawmidi_exit)
Linux with added FPC-III support