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Merge tag 'iommu-fixes-v5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / sound / core / rawmidi.c
CommitLineData
1da177e4
LT		 1/*
2 * Abstract layer for MIDI v1.0 stream
c1017a4c 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 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
1da177e4
LT		 22#include <sound/core.h>
23#include <linux/major.h>
24#include <linux/init.h>
174cd4b1 25#include <linux/sched/signal.h>
1da177e4
LT		 26#include <linux/slab.h>
27#include <linux/time.h>
28#include <linux/wait.h>
1a60d4c5 29#include <linux/mutex.h>
65a77217 30#include <linux/module.h>
1da177e4 31#include <linux/delay.h>
ef4db239 32#include <linux/mm.h>
2b1d9c8f 33#include <linux/nospec.h>
1da177e4
LT		 34#include <sound/rawmidi.h>
35#include <sound/info.h>
36#include <sound/control.h>
37#include <sound/minors.h>
38#include <sound/initval.h>
39
c1017a4c 40MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4
LT		 41MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
42MODULE_LICENSE("GPL");
43
44#ifdef CONFIG_SND_OSSEMUL
6581f4e7 45static int midi_map[SNDRV_CARDS];
1da177e4
LT		 46static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
47module_param_array(midi_map, int, NULL, 0444);
48MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
49module_param_array(amidi_map, int, NULL, 0444);
50MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
51#endif /* CONFIG_SND_OSSEMUL */
52
48c9d417
TI		 53static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
54static int snd_rawmidi_dev_free(struct snd_device *device);
55static int snd_rawmidi_dev_register(struct snd_device *device);
56static int snd_rawmidi_dev_disconnect(struct snd_device *device);
1da177e4 57
f87135f5 58static LIST_HEAD(snd_rawmidi_devices);
1a60d4c5 59static DEFINE_MUTEX(register_mutex);
1da177e4 60
ca20d292 61#define rmidi_err(rmidi, fmt, args...) \
07cc3e8b 62 dev_err(&(rmidi)->dev, fmt, ##args)
ca20d292 63#define rmidi_warn(rmidi, fmt, args...) \
07cc3e8b 64 dev_warn(&(rmidi)->dev, fmt, ##args)
ca20d292 65#define rmidi_dbg(rmidi, fmt, args...) \
07cc3e8b 66 dev_dbg(&(rmidi)->dev, fmt, ##args)
ca20d292 67
f87135f5
CL		 68static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
69{
f87135f5
CL		 70 struct snd_rawmidi *rawmidi;
71
9244b2c3 72 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
f87135f5
CL		 73 if (rawmidi->card == card && rawmidi->device == device)
74 return rawmidi;
f87135f5
CL		 75 return NULL;
76}
77
1da177e4
LT		 78static inline unsigned short snd_rawmidi_file_flags(struct file *file)
79{
80 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
81 case FMODE_WRITE:
82 return SNDRV_RAWMIDI_LFLG_OUTPUT;
83 case FMODE_READ:
84 return SNDRV_RAWMIDI_LFLG_INPUT;
85 default:
86 return SNDRV_RAWMIDI_LFLG_OPEN;
87 }
88}
89
48c9d417 90static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
1da177e4 91{
48c9d417 92 struct snd_rawmidi_runtime *runtime = substream->runtime;
5bed9139 93
1da177e4
LT		 94 return runtime->avail >= runtime->avail_min;
95}
96
48c9d417
TI		 97static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
98 size_t count)
1da177e4 99{
48c9d417 100 struct snd_rawmidi_runtime *runtime = substream->runtime;
5bed9139 101
1da177e4
LT		 102 return runtime->avail >= runtime->avail_min &&
103 (!substream->append || runtime->avail >= count);
104}
105
b3c705aa 106static void snd_rawmidi_input_event_work(struct work_struct *work)
1da177e4 107{
b3c705aa
TI		 108 struct snd_rawmidi_runtime *runtime =
109 container_of(work, struct snd_rawmidi_runtime, event_work);
5bed9139 110
b3c705aa
TI		 111 if (runtime->event)
112 runtime->event(runtime->substream);
1da177e4
LT		 113}
114
48c9d417 115static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
1da177e4 116{
48c9d417 117 struct snd_rawmidi_runtime *runtime;
1da177e4 118
5bed9139
TI		 119 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
120 if (!runtime)
1da177e4 121 return -ENOMEM;
b3c705aa 122 runtime->substream = substream;
1da177e4
LT		 123 spin_lock_init(&runtime->lock);
124 init_waitqueue_head(&runtime->sleep);
b3c705aa 125 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
1da177e4
LT		 126 runtime->event = NULL;
127 runtime->buffer_size = PAGE_SIZE;
128 runtime->avail_min = 1;
129 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
130 runtime->avail = 0;
131 else
132 runtime->avail = runtime->buffer_size;
5a7b44a8 133 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
5bed9139 134 if (!runtime->buffer) {
1da177e4
LT		 135 kfree(runtime);
136 return -ENOMEM;
137 }
138 runtime->appl_ptr = runtime->hw_ptr = 0;
139 substream->runtime = runtime;
140 return 0;
141}
142
48c9d417 143static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
1da177e4 144{
48c9d417 145 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4 146
ef4db239 147 kvfree(runtime->buffer);
1da177e4
LT		 148 kfree(runtime);
149 substream->runtime = NULL;
150 return 0;
151}
152
5bed9139 153static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 154{
219df32f
TI		 155 if (!substream->opened)
156 return;
b3c705aa 157 substream->ops->trigger(substream, up);
1da177e4
LT		 158}
159
48c9d417 160static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 161{
219df32f
TI		 162 if (!substream->opened)
163 return;
1da177e4 164 substream->ops->trigger(substream, up);
b3c705aa
TI		 165 if (!up)
166 cancel_work_sync(&substream->runtime->event_work);
1da177e4
LT		 167}
168
f5beb598
TI		 169static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
170 bool is_input)
171{
172 runtime->drain = 0;
173 runtime->appl_ptr = runtime->hw_ptr = 0;
174 runtime->avail = is_input ? 0 : runtime->buffer_size;
175}
176
177static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
178 bool is_input)
1da177e4
LT		 179{
180 unsigned long flags;
1da177e4 181
1da177e4 182 spin_lock_irqsave(&runtime->lock, flags);
f5beb598 183 __reset_runtime_ptrs(runtime, is_input);
1da177e4 184 spin_unlock_irqrestore(&runtime->lock, flags);
f5beb598
TI		 185}
186
187int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
188{
189 snd_rawmidi_output_trigger(substream, 0);
190 reset_runtime_ptrs(substream->runtime, false);
1da177e4
LT		 191 return 0;
192}
6776a5d7 193EXPORT_SYMBOL(snd_rawmidi_drop_output);
1da177e4 194
48c9d417 195int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
1da177e4
LT		 196{
197 int err;
198 long timeout;
48c9d417 199 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 200
201 err = 0;
202 runtime->drain = 1;
203 timeout = wait_event_interruptible_timeout(runtime->sleep,
204 (runtime->avail >= runtime->buffer_size),
205 10*HZ);
206 if (signal_pending(current))
207 err = -ERESTARTSYS;
208 if (runtime->avail < runtime->buffer_size && !timeout) {
ca20d292
TI		 209 rmidi_warn(substream->rmidi,
210 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
211 (long)runtime->avail, (long)runtime->buffer_size);
1da177e4
LT		 212 err = -EIO;
213 }
214 runtime->drain = 0;
215 if (err != -ERESTARTSYS) {
216 /* we need wait a while to make sure that Tx FIFOs are empty */
217 if (substream->ops->drain)
218 substream->ops->drain(substream);
219 else
220 msleep(50);
221 snd_rawmidi_drop_output(substream);
222 }
223 return err;
224}
6776a5d7 225EXPORT_SYMBOL(snd_rawmidi_drain_output);
1da177e4 226
48c9d417 227int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
1da177e4 228{
1da177e4 229 snd_rawmidi_input_trigger(substream, 0);
f5beb598 230 reset_runtime_ptrs(substream->runtime, true);
1da177e4
LT		 231 return 0;
232}
6776a5d7 233EXPORT_SYMBOL(snd_rawmidi_drain_input);
1da177e4 234
9a1b64ca
TI		 235/* look for an available substream for the given stream direction;
236 * if a specific subdevice is given, try to assign it
237 */
238static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
239 int stream, int mode,
240 struct snd_rawmidi_substream **sub_ret)
1da177e4 241{
9a1b64ca
TI		 242 struct snd_rawmidi_substream *substream;
243 struct snd_rawmidi_str *s = &rmidi->streams[stream];
244 static unsigned int info_flags[2] = {
245 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
246 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
247 };
1da177e4 248
9a1b64ca 249 if (!(rmidi->info_flags & info_flags[stream]))
f9d20283 250 return -ENXIO;
9a1b64ca
TI		 251 if (subdevice >= 0 && subdevice >= s->substream_count)
252 return -ENODEV;
9a1b64ca
TI		 253
254 list_for_each_entry(substream, &s->substreams, list) {
255 if (substream->opened) {
256 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
16fb1096
CL		 257 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
258 !substream->append)
9a1b64ca
TI		 259 continue;
260 }
261 if (subdevice < 0 || subdevice == substream->number) {
262 *sub_ret = substream;
263 return 0;
264 }
1da177e4 265 }
9a1b64ca
TI		 266 return -EAGAIN;
267}
f9d20283 268
9a1b64ca
TI		 269/* open and do ref-counting for the given substream */
270static int open_substream(struct snd_rawmidi *rmidi,
271 struct snd_rawmidi_substream *substream,
272 int mode)
273{
274 int err;
275
8579d2d7
CL		 276 if (substream->use_count == 0) {
277 err = snd_rawmidi_runtime_create(substream);
278 if (err < 0)
279 return err;
280 err = substream->ops->open(substream);
b7fe750f
CL		 281 if (err < 0) {
282 snd_rawmidi_runtime_free(substream);
8579d2d7 283 return err;
b7fe750f 284 }
8579d2d7 285 substream->opened = 1;
2d4b8420 286 substream->active_sensing = 0;
8579d2d7
CL		 287 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
288 substream->append = 1;
7584af10 289 substream->pid = get_pid(task_pid(current));
91d12c48 290 rmidi->streams[substream->stream].substream_opened++;
8579d2d7
CL		 291 }
292 substream->use_count++;
9a1b64ca
TI		 293 return 0;
294}
295
296static void close_substream(struct snd_rawmidi *rmidi,
297 struct snd_rawmidi_substream *substream,
298 int cleanup);
299
300static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
301 struct snd_rawmidi_file *rfile)
302{
303 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
304 int err;
305
306 rfile->input = rfile->output = NULL;
1da177e4 307 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
9a1b64ca
TI		 308 err = assign_substream(rmidi, subdevice,
309 SNDRV_RAWMIDI_STREAM_INPUT,
310 mode, &sinput);
311 if (err < 0)
b7fe750f 312 return err;
1da177e4
LT		 313 }
314 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
9a1b64ca
TI		 315 err = assign_substream(rmidi, subdevice,
316 SNDRV_RAWMIDI_STREAM_OUTPUT,
317 mode, &soutput);
318 if (err < 0)
b7fe750f 319 return err;
1da177e4 320 }
9a1b64ca
TI		 321
322 if (sinput) {
323 err = open_substream(rmidi, sinput, mode);
324 if (err < 0)
b7fe750f 325 return err;
1da177e4 326 }
9a1b64ca
TI		 327 if (soutput) {
328 err = open_substream(rmidi, soutput, mode);
329 if (err < 0) {
330 if (sinput)
331 close_substream(rmidi, sinput, 0);
b7fe750f 332 return err;
1da177e4 333 }
1da177e4 334 }
9a1b64ca
TI		 335
336 rfile->rmidi = rmidi;
337 rfile->input = sinput;
338 rfile->output = soutput;
1da177e4 339 return 0;
9a1b64ca
TI		 340}
341
342/* called from sound/core/seq/seq_midi.c */
343int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
5bed9139 344 int mode, struct snd_rawmidi_file *rfile)
9a1b64ca
TI		 345{
346 struct snd_rawmidi *rmidi;
7fdc9b08 347 int err = 0;
9a1b64ca
TI		 348
349 if (snd_BUG_ON(!rfile))
350 return -EINVAL;
351
352 mutex_lock(&register_mutex);
353 rmidi = snd_rawmidi_search(card, device);
7fdc9b08
TI		 354 if (!rmidi)
355 err = -ENODEV;
356 else if (!try_module_get(rmidi->card->module))
357 err = -ENXIO;
9a1b64ca 358 mutex_unlock(&register_mutex);
7fdc9b08
TI		 359 if (err < 0)
360 return err;
9a1b64ca
TI		 361
362 mutex_lock(&rmidi->open_mutex);
363 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
364 mutex_unlock(&rmidi->open_mutex);
365 if (err < 0)
366 module_put(rmidi->card->module);
1da177e4
LT		 367 return err;
368}
6776a5d7 369EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1da177e4
LT		 370
371static int snd_rawmidi_open(struct inode *inode, struct file *file)
372{
373 int maj = imajor(inode);
48c9d417 374 struct snd_card *card;
f87135f5 375 int subdevice;
1da177e4
LT		 376 unsigned short fflags;
377 int err;
48c9d417 378 struct snd_rawmidi *rmidi;
9a1b64ca 379 struct snd_rawmidi_file *rawmidi_file = NULL;
ac6424b9 380 wait_queue_entry_t wait;
1da177e4 381
5bed9139 382 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
9a1b64ca
TI		 383 return -EINVAL; /* invalid combination */
384
02f4865f
TI		 385 err = nonseekable_open(inode, file);
386 if (err < 0)
387 return err;
388
f1902860 389 if (maj == snd_major) {
f87135f5
CL		 390 rmidi = snd_lookup_minor_data(iminor(inode),
391 SNDRV_DEVICE_TYPE_RAWMIDI);
1da177e4 392#ifdef CONFIG_SND_OSSEMUL
f1902860 393 } else if (maj == SOUND_MAJOR) {
f87135f5
CL		 394 rmidi = snd_lookup_oss_minor_data(iminor(inode),
395 SNDRV_OSS_DEVICE_TYPE_MIDI);
1da177e4 396#endif
f1902860 397 } else
1da177e4 398 return -ENXIO;
1da177e4 399
1da177e4
LT		 400 if (rmidi == NULL)
401 return -ENODEV;
9a1b64ca 402
a0830dbd
TI		 403 if (!try_module_get(rmidi->card->module)) {
404 snd_card_unref(rmidi->card);
9a1b64ca 405 return -ENXIO;
a0830dbd 406 }
9a1b64ca
TI		 407
408 mutex_lock(&rmidi->open_mutex);
1da177e4
LT		 409 card = rmidi->card;
410 err = snd_card_file_add(card, file);
411 if (err < 0)
9a1b64ca 412 goto __error_card;
1da177e4 413 fflags = snd_rawmidi_file_flags(file);
f1902860 414 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
1da177e4 415 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
1da177e4
LT		 416 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
417 if (rawmidi_file == NULL) {
9a1b64ca
TI		 418 err = -ENOMEM;
419 goto __error;
1da177e4
LT		 420 }
421 init_waitqueue_entry(&wait, current);
422 add_wait_queue(&rmidi->open_wait, &wait);
1da177e4 423 while (1) {
23c18d4b 424 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
9a1b64ca 425 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
1da177e4
LT		 426 if (err >= 0)
427 break;
428 if (err == -EAGAIN) {
429 if (file->f_flags & O_NONBLOCK) {
430 err = -EBUSY;
431 break;
432 }
433 } else
434 break;
435 set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5 436 mutex_unlock(&rmidi->open_mutex);
1da177e4 437 schedule();
1a60d4c5 438 mutex_lock(&rmidi->open_mutex);
0914f796
TI		 439 if (rmidi->card->shutdown) {
440 err = -ENODEV;
441 break;
442 }
1da177e4
LT		 443 if (signal_pending(current)) {
444 err = -ERESTARTSYS;
445 break;
446 }
447 }
9a1b64ca
TI		 448 remove_wait_queue(&rmidi->open_wait, &wait);
449 if (err < 0) {
450 kfree(rawmidi_file);
451 goto __error;
452 }
1da177e4
LT		 453#ifdef CONFIG_SND_OSSEMUL
454 if (rawmidi_file->input && rawmidi_file->input->runtime)
455 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
456 if (rawmidi_file->output && rawmidi_file->output->runtime)
457 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
458#endif
9a1b64ca
TI		 459 file->private_data = rawmidi_file;
460 mutex_unlock(&rmidi->open_mutex);
a0830dbd 461 snd_card_unref(rmidi->card);
9a1b64ca
TI		 462 return 0;
463
464 __error:
465 snd_card_file_remove(card, file);
466 __error_card:
1a60d4c5 467 mutex_unlock(&rmidi->open_mutex);
9a1b64ca 468 module_put(rmidi->card->module);
a0830dbd 469 snd_card_unref(rmidi->card);
1da177e4
LT		 470 return err;
471}
472
9a1b64ca
TI		 473static void close_substream(struct snd_rawmidi *rmidi,
474 struct snd_rawmidi_substream *substream,
475 int cleanup)
1da177e4 476{
9a1b64ca
TI		 477 if (--substream->use_count)
478 return;
1da177e4 479
9a1b64ca
TI		 480 if (cleanup) {
481 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
482 snd_rawmidi_input_trigger(substream, 0);
483 else {
1da177e4
LT		 484 if (substream->active_sensing) {
485 unsigned char buf = 0xfe;
9a1b64ca
TI		 486 /* sending single active sensing message
487 * to shut the device up
488 */
1da177e4
LT		 489 snd_rawmidi_kernel_write(substream, &buf, 1);
490 }
491 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
492 snd_rawmidi_output_trigger(substream, 0);
1da177e4 493 }
1da177e4 494 }
9a1b64ca
TI		 495 substream->ops->close(substream);
496 if (substream->runtime->private_free)
497 substream->runtime->private_free(substream);
498 snd_rawmidi_runtime_free(substream);
499 substream->opened = 0;
500 substream->append = 0;
7584af10
CL		 501 put_pid(substream->pid);
502 substream->pid = NULL;
91d12c48 503 rmidi->streams[substream->stream].substream_opened--;
9a1b64ca
TI		 504}
505
506static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
507{
508 struct snd_rawmidi *rmidi;
509
510 rmidi = rfile->rmidi;
511 mutex_lock(&rmidi->open_mutex);
512 if (rfile->input) {
513 close_substream(rmidi, rfile->input, 1);
514 rfile->input = NULL;
515 }
516 if (rfile->output) {
517 close_substream(rmidi, rfile->output, 1);
518 rfile->output = NULL;
519 }
520 rfile->rmidi = NULL;
1a60d4c5 521 mutex_unlock(&rmidi->open_mutex);
9a1b64ca
TI		 522 wake_up(&rmidi->open_wait);
523}
524
525/* called from sound/core/seq/seq_midi.c */
526int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
527{
528 struct snd_rawmidi *rmidi;
529
530 if (snd_BUG_ON(!rfile))
531 return -ENXIO;
5bed9139 532
9a1b64ca
TI		 533 rmidi = rfile->rmidi;
534 rawmidi_release_priv(rfile);
1da177e4
LT		 535 module_put(rmidi->card->module);
536 return 0;
537}
6776a5d7 538EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1da177e4
LT		 539
540static int snd_rawmidi_release(struct inode *inode, struct file *file)
541{
48c9d417
TI		 542 struct snd_rawmidi_file *rfile;
543 struct snd_rawmidi *rmidi;
aa73aec6 544 struct module *module;
1da177e4
LT		 545
546 rfile = file->private_data;
1da177e4 547 rmidi = rfile->rmidi;
9a1b64ca 548 rawmidi_release_priv(rfile);
1da177e4 549 kfree(rfile);
aa73aec6 550 module = rmidi->card->module;
1da177e4 551 snd_card_file_remove(rmidi->card, file);
aa73aec6 552 module_put(module);
9a1b64ca 553 return 0;
1da177e4
LT		 554}
555
18612048
AB		 556static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
557 struct snd_rawmidi_info *info)
1da177e4 558{
48c9d417 559 struct snd_rawmidi *rmidi;
5bed9139 560
1da177e4
LT		 561 if (substream == NULL)
562 return -ENODEV;
563 rmidi = substream->rmidi;
564 memset(info, 0, sizeof(*info));
565 info->card = rmidi->card->number;
566 info->device = rmidi->device;
567 info->subdevice = substream->number;
568 info->stream = substream->stream;
569 info->flags = rmidi->info_flags;
570 strcpy(info->id, rmidi->id);
571 strcpy(info->name, rmidi->name);
572 strcpy(info->subname, substream->name);
573 info->subdevices_count = substream->pstr->substream_count;
574 info->subdevices_avail = (substream->pstr->substream_count -
575 substream->pstr->substream_opened);
576 return 0;
577}
578
48c9d417 579static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
5bed9139 580 struct snd_rawmidi_info __user *_info)
1da177e4 581{
48c9d417 582 struct snd_rawmidi_info info;
1da177e4 583 int err;
5bed9139
TI		 584
585 err = snd_rawmidi_info(substream, &info);
586 if (err < 0)
1da177e4 587 return err;
48c9d417 588 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
1da177e4
LT		 589 return -EFAULT;
590 return 0;
591}
592
c1cfd902
TI		 593static int __snd_rawmidi_info_select(struct snd_card *card,
594 struct snd_rawmidi_info *info)
1da177e4 595{
48c9d417
TI		 596 struct snd_rawmidi *rmidi;
597 struct snd_rawmidi_str *pstr;
598 struct snd_rawmidi_substream *substream;
f87135f5 599
f87135f5 600 rmidi = snd_rawmidi_search(card, info->device);
a106cd3d
CL		 601 if (!rmidi)
602 return -ENXIO;
1da177e4
LT		 603 if (info->stream < 0 || info->stream > 1)
604 return -EINVAL;
2b1d9c8f 605 info->stream = array_index_nospec(info->stream, 2);
1da177e4
LT		 606 pstr = &rmidi->streams[info->stream];
607 if (pstr->substream_count == 0)
608 return -ENOENT;
609 if (info->subdevice >= pstr->substream_count)
610 return -ENXIO;
9244b2c3 611 list_for_each_entry(substream, &pstr->substreams, list) {
1da177e4
LT		 612 if ((unsigned int)substream->number == info->subdevice)
613 return snd_rawmidi_info(substream, info);
614 }
615 return -ENXIO;
616}
c1cfd902
TI		 617
618int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
619{
620 int ret;
621
622 mutex_lock(&register_mutex);
623 ret = __snd_rawmidi_info_select(card, info);
624 mutex_unlock(&register_mutex);
625 return ret;
626}
6776a5d7 627EXPORT_SYMBOL(snd_rawmidi_info_select);
1da177e4 628
48c9d417
TI		 629static int snd_rawmidi_info_select_user(struct snd_card *card,
630 struct snd_rawmidi_info __user *_info)
1da177e4
LT		 631{
632 int err;
48c9d417 633 struct snd_rawmidi_info info;
5bed9139 634
1da177e4
LT		 635 if (get_user(info.device, &_info->device))
636 return -EFAULT;
637 if (get_user(info.stream, &_info->stream))
638 return -EFAULT;
639 if (get_user(info.subdevice, &_info->subdevice))
640 return -EFAULT;
5bed9139
TI		 641 err = snd_rawmidi_info_select(card, &info);
642 if (err < 0)
1da177e4 643 return err;
48c9d417 644 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
1da177e4
LT		 645 return -EFAULT;
646 return 0;
647}
648
f5beb598
TI		 649static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
650 struct snd_rawmidi_params *params,
651 bool is_input)
1da177e4 652{
39675f7a 653 char *newbuf, *oldbuf;
5bed9139 654
5bed9139 655 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
1da177e4 656 return -EINVAL;
5bed9139 657 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
1da177e4 658 return -EINVAL;
1da177e4 659 if (params->buffer_size != runtime->buffer_size) {
5a7b44a8 660 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
4fa95ef6 661 if (!newbuf)
1da177e4 662 return -ENOMEM;
39675f7a
TI		 663 spin_lock_irq(&runtime->lock);
664 oldbuf = runtime->buffer;
1da177e4
LT		 665 runtime->buffer = newbuf;
666 runtime->buffer_size = params->buffer_size;
f5beb598 667 __reset_runtime_ptrs(runtime, is_input);
39675f7a 668 spin_unlock_irq(&runtime->lock);
ef4db239 669 kvfree(oldbuf);
1da177e4
LT		 670 }
671 runtime->avail_min = params->avail_min;
1da177e4
LT		 672 return 0;
673}
f5beb598
TI		 674
675int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
676 struct snd_rawmidi_params *params)
677{
678 if (substream->append && substream->use_count > 1)
679 return -EBUSY;
680 snd_rawmidi_drain_output(substream);
681 substream->active_sensing = !params->no_active_sensing;
682 return resize_runtime_buffer(substream->runtime, params, false);
683}
6776a5d7 684EXPORT_SYMBOL(snd_rawmidi_output_params);
1da177e4 685
48c9d417 686int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
5bed9139 687 struct snd_rawmidi_params *params)
1da177e4 688{
1da177e4 689 snd_rawmidi_drain_input(substream);
f5beb598 690 return resize_runtime_buffer(substream->runtime, params, true);
1da177e4 691}
6776a5d7 692EXPORT_SYMBOL(snd_rawmidi_input_params);
1da177e4 693
48c9d417 694static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
5bed9139 695 struct snd_rawmidi_status *status)
1da177e4 696{
48c9d417 697 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 698
699 memset(status, 0, sizeof(*status));
700 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
701 spin_lock_irq(&runtime->lock);
702 status->avail = runtime->avail;
703 spin_unlock_irq(&runtime->lock);
704 return 0;
705}
706
48c9d417 707static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
5bed9139 708 struct snd_rawmidi_status *status)
1da177e4 709{
48c9d417 710 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 711
712 memset(status, 0, sizeof(*status));
713 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
714 spin_lock_irq(&runtime->lock);
715 status->avail = runtime->avail;
716 status->xruns = runtime->xruns;
717 runtime->xruns = 0;
718 spin_unlock_irq(&runtime->lock);
719 return 0;
720}
721
722static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
723{
48c9d417 724 struct snd_rawmidi_file *rfile;
1da177e4
LT		 725 void __user *argp = (void __user *)arg;
726
727 rfile = file->private_data;
728 if (((cmd >> 8) & 0xff) != 'W')
729 return -ENOTTY;
730 switch (cmd) {
731 case SNDRV_RAWMIDI_IOCTL_PVERSION:
732 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
733 case SNDRV_RAWMIDI_IOCTL_INFO:
734 {
48c9d417
TI		 735 int stream;
736 struct snd_rawmidi_info __user *info = argp;
5bed9139 737
1da177e4
LT		 738 if (get_user(stream, &info->stream))
739 return -EFAULT;
740 switch (stream) {
741 case SNDRV_RAWMIDI_STREAM_INPUT:
742 return snd_rawmidi_info_user(rfile->input, info);
743 case SNDRV_RAWMIDI_STREAM_OUTPUT:
744 return snd_rawmidi_info_user(rfile->output, info);
745 default:
746 return -EINVAL;
747 }
748 }
749 case SNDRV_RAWMIDI_IOCTL_PARAMS:
750 {
48c9d417 751 struct snd_rawmidi_params params;
5bed9139 752
48c9d417 753 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
1da177e4
LT		 754 return -EFAULT;
755 switch (params.stream) {
756 case SNDRV_RAWMIDI_STREAM_OUTPUT:
757 if (rfile->output == NULL)
758 return -EINVAL;
759 return snd_rawmidi_output_params(rfile->output, &params);
760 case SNDRV_RAWMIDI_STREAM_INPUT:
761 if (rfile->input == NULL)
762 return -EINVAL;
763 return snd_rawmidi_input_params(rfile->input, &params);
764 default:
765 return -EINVAL;
766 }
767 }
768 case SNDRV_RAWMIDI_IOCTL_STATUS:
769 {
770 int err = 0;
48c9d417 771 struct snd_rawmidi_status status;
5bed9139 772
48c9d417 773 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
1da177e4
LT		 774 return -EFAULT;
775 switch (status.stream) {
776 case SNDRV_RAWMIDI_STREAM_OUTPUT:
777 if (rfile->output == NULL)
778 return -EINVAL;
779 err = snd_rawmidi_output_status(rfile->output, &status);
780 break;
781 case SNDRV_RAWMIDI_STREAM_INPUT:
782 if (rfile->input == NULL)
783 return -EINVAL;
784 err = snd_rawmidi_input_status(rfile->input, &status);
785 break;
786 default:
787 return -EINVAL;
788 }
789 if (err < 0)
790 return err;
48c9d417 791 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
1da177e4
LT		 792 return -EFAULT;
793 return 0;
794 }
795 case SNDRV_RAWMIDI_IOCTL_DROP:
796 {
797 int val;
5bed9139 798
1da177e4
LT		 799 if (get_user(val, (int __user *) argp))
800 return -EFAULT;
801 switch (val) {
802 case SNDRV_RAWMIDI_STREAM_OUTPUT:
803 if (rfile->output == NULL)
804 return -EINVAL;
805 return snd_rawmidi_drop_output(rfile->output);
806 default:
807 return -EINVAL;
808 }
809 }
810 case SNDRV_RAWMIDI_IOCTL_DRAIN:
811 {
812 int val;
5bed9139 813
1da177e4
LT		 814 if (get_user(val, (int __user *) argp))
815 return -EFAULT;
816 switch (val) {
817 case SNDRV_RAWMIDI_STREAM_OUTPUT:
818 if (rfile->output == NULL)
819 return -EINVAL;
820 return snd_rawmidi_drain_output(rfile->output);
821 case SNDRV_RAWMIDI_STREAM_INPUT:
822 if (rfile->input == NULL)
823 return -EINVAL;
824 return snd_rawmidi_drain_input(rfile->input);
825 default:
826 return -EINVAL;
827 }
828 }
1da177e4 829 default:
ca20d292
TI		 830 rmidi_dbg(rfile->rmidi,
831 "rawmidi: unknown command = 0x%x\n", cmd);
1da177e4
LT		 832 }
833 return -ENOTTY;
834}
835
48c9d417
TI		 836static int snd_rawmidi_control_ioctl(struct snd_card *card,
837 struct snd_ctl_file *control,
1da177e4
LT		 838 unsigned int cmd,
839 unsigned long arg)
840{
841 void __user *argp = (void __user *)arg;
1da177e4 842
1da177e4
LT		 843 switch (cmd) {
844 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
845 {
846 int device;
5bed9139 847
1da177e4
LT		 848 if (get_user(device, (int __user *)argp))
849 return -EFAULT;
a7a13d06
DC		 850 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
851 device = SNDRV_RAWMIDI_DEVICES - 1;
1a60d4c5 852 mutex_lock(&register_mutex);
1da177e4
LT		 853 device = device < 0 ? 0 : device + 1;
854 while (device < SNDRV_RAWMIDI_DEVICES) {
f87135f5 855 if (snd_rawmidi_search(card, device))
1da177e4
LT		 856 break;
857 device++;
858 }
859 if (device == SNDRV_RAWMIDI_DEVICES)
860 device = -1;
1a60d4c5 861 mutex_unlock(&register_mutex);
1da177e4
LT		 862 if (put_user(device, (int __user *)argp))
863 return -EFAULT;
864 return 0;
865 }
866 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
867 {
868 int val;
5bed9139 869
1da177e4
LT		 870 if (get_user(val, (int __user *)argp))
871 return -EFAULT;
23c18d4b 872 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1da177e4
LT		 873 return 0;
874 }
875 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
876 return snd_rawmidi_info_select_user(card, argp);
877 }
878 return -ENOIOCTLCMD;
879}
880
881/**
882 * snd_rawmidi_receive - receive the input data from the device
883 * @substream: the rawmidi substream
884 * @buffer: the buffer pointer
885 * @count: the data size to read
886 *
887 * Reads the data from the internal buffer.
888 *
eb7c06e8 889 * Return: The size of read data, or a negative error code on failure.
1da177e4 890 */
48c9d417
TI		 891int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
892 const unsigned char *buffer, int count)
1da177e4
LT		 893{
894 unsigned long flags;
895 int result = 0, count1;
48c9d417 896 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4 897
219df32f
TI		 898 if (!substream->opened)
899 return -EBADFD;
1da177e4 900 if (runtime->buffer == NULL) {
ca20d292
TI		 901 rmidi_dbg(substream->rmidi,
902 "snd_rawmidi_receive: input is not active!!!\n");
1da177e4
LT		 903 return -EINVAL;
904 }
905 spin_lock_irqsave(&runtime->lock, flags);
906 if (count == 1) { /* special case, faster code */
907 substream->bytes++;
908 if (runtime->avail < runtime->buffer_size) {
909 runtime->buffer[runtime->hw_ptr++] = buffer[0];
910 runtime->hw_ptr %= runtime->buffer_size;
911 runtime->avail++;
912 result++;
913 } else {
914 runtime->xruns++;
915 }
916 } else {
917 substream->bytes += count;
918 count1 = runtime->buffer_size - runtime->hw_ptr;
919 if (count1 > count)
920 count1 = count;
921 if (count1 > (int)(runtime->buffer_size - runtime->avail))
922 count1 = runtime->buffer_size - runtime->avail;
923 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
924 runtime->hw_ptr += count1;
925 runtime->hw_ptr %= runtime->buffer_size;
926 runtime->avail += count1;
927 count -= count1;
928 result += count1;
929 if (count > 0) {
930 buffer += count1;
931 count1 = count;
932 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
933 count1 = runtime->buffer_size - runtime->avail;
934 runtime->xruns += count - count1;
935 }
936 if (count1 > 0) {
937 memcpy(runtime->buffer, buffer, count1);
938 runtime->hw_ptr = count1;
939 runtime->avail += count1;
940 result += count1;
941 }
942 }
943 }
944 if (result > 0) {
945 if (runtime->event)
b3c705aa 946 schedule_work(&runtime->event_work);
1da177e4
LT		 947 else if (snd_rawmidi_ready(substream))
948 wake_up(&runtime->sleep);
949 }
950 spin_unlock_irqrestore(&runtime->lock, flags);
951 return result;
952}
6776a5d7 953EXPORT_SYMBOL(snd_rawmidi_receive);
1da177e4 954
48c9d417 955static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
17596a80
MŚ		 956 unsigned char __user *userbuf,
957 unsigned char *kernelbuf, long count)
1da177e4
LT		 958{
959 unsigned long flags;
960 long result = 0, count1;
48c9d417 961 struct snd_rawmidi_runtime *runtime = substream->runtime;
81f57754 962 unsigned long appl_ptr;
1da177e4 963
81f57754 964 spin_lock_irqsave(&runtime->lock, flags);
1da177e4
LT		 965 while (count > 0 && runtime->avail) {
966 count1 = runtime->buffer_size - runtime->appl_ptr;
967 if (count1 > count)
968 count1 = count;
1da177e4
LT		 969 if (count1 > (int)runtime->avail)
970 count1 = runtime->avail;
81f57754
TI		 971
972 /* update runtime->appl_ptr before unlocking for userbuf */
973 appl_ptr = runtime->appl_ptr;
974 runtime->appl_ptr += count1;
975 runtime->appl_ptr %= runtime->buffer_size;
976 runtime->avail -= count1;
977
17596a80 978 if (kernelbuf)
81f57754 979 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
17596a80 980 if (userbuf) {
1da177e4 981 spin_unlock_irqrestore(&runtime->lock, flags);
17596a80 982 if (copy_to_user(userbuf + result,
81f57754 983 runtime->buffer + appl_ptr, count1)) {
1da177e4
LT		 984 return result > 0 ? result : -EFAULT;
985 }
986 spin_lock_irqsave(&runtime->lock, flags);
987 }
1da177e4
LT		 988 result += count1;
989 count -= count1;
990 }
81f57754 991 spin_unlock_irqrestore(&runtime->lock, flags);
1da177e4
LT		 992 return result;
993}
994
48c9d417
TI		 995long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
996 unsigned char *buf, long count)
1da177e4
LT		 997{
998 snd_rawmidi_input_trigger(substream, 1);
17596a80 999 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1da177e4 1000}
6776a5d7 1001EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1da177e4 1002
48c9d417
TI		 1003static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1004 loff_t *offset)
1da177e4
LT		 1005{
1006 long result;
1007 int count1;
48c9d417
TI		 1008 struct snd_rawmidi_file *rfile;
1009 struct snd_rawmidi_substream *substream;
1010 struct snd_rawmidi_runtime *runtime;
1da177e4
LT		 1011
1012 rfile = file->private_data;
1013 substream = rfile->input;
1014 if (substream == NULL)
1015 return -EIO;
1016 runtime = substream->runtime;
1017 snd_rawmidi_input_trigger(substream, 1);
1018 result = 0;
1019 while (count > 0) {
1020 spin_lock_irq(&runtime->lock);
1021 while (!snd_rawmidi_ready(substream)) {
ac6424b9 1022 wait_queue_entry_t wait;
5bed9139 1023
1da177e4
LT		 1024 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1025 spin_unlock_irq(&runtime->lock);
1026 return result > 0 ? result : -EAGAIN;
1027 }
1028 init_waitqueue_entry(&wait, current);
1029 add_wait_queue(&runtime->sleep, &wait);
1030 set_current_state(TASK_INTERRUPTIBLE);
1031 spin_unlock_irq(&runtime->lock);
1032 schedule();
1033 remove_wait_queue(&runtime->sleep, &wait);
0914f796
TI		 1034 if (rfile->rmidi->card->shutdown)
1035 return -ENODEV;
1da177e4
LT		 1036 if (signal_pending(current))
1037 return result > 0 ? result : -ERESTARTSYS;
1038 if (!runtime->avail)
1039 return result > 0 ? result : -EIO;
1040 spin_lock_irq(&runtime->lock);
1041 }
1042 spin_unlock_irq(&runtime->lock);
4d23359b 1043 count1 = snd_rawmidi_kernel_read1(substream,
17596a80
MŚ		 1044 (unsigned char __user *)buf,
1045 NULL/*kernelbuf*/,
1046 count);
1da177e4
LT		 1047 if (count1 < 0)
1048 return result > 0 ? result : count1;
1049 result += count1;
1050 buf += count1;
1051 count -= count1;
1052 }
1053 return result;
1054}
1055
1056/**
1057 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1058 * @substream: the rawmidi substream
eb7c06e8
YB		 1059 *
1060 * Return: 1 if the internal output buffer is empty, 0 if not.
1da177e4 1061 */
48c9d417 1062int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1da177e4 1063{
48c9d417 1064 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 1065 int result;
1066 unsigned long flags;
1067
1068 if (runtime->buffer == NULL) {
ca20d292
TI		 1069 rmidi_dbg(substream->rmidi,
1070 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1da177e4
LT		 1071 return 1;
1072 }
1073 spin_lock_irqsave(&runtime->lock, flags);
1074 result = runtime->avail >= runtime->buffer_size;
1075 spin_unlock_irqrestore(&runtime->lock, flags);
5bed9139 1076 return result;
1da177e4 1077}
6776a5d7 1078EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1da177e4
LT		 1079
1080/**
06ab3003 1081 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1da177e4
LT		 1082 * @substream: the rawmidi substream
1083 * @buffer: the buffer pointer
1084 * @count: data size to transfer
1085 *
06ab3003 1086 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1da177e4 1087 */
06ab3003 1088int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
48c9d417 1089 unsigned char *buffer, int count)
1da177e4 1090{
1da177e4 1091 int result, count1;
48c9d417 1092 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 1093
1094 if (runtime->buffer == NULL) {
ca20d292
TI		 1095 rmidi_dbg(substream->rmidi,
1096 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1da177e4
LT		 1097 return -EINVAL;
1098 }
1099 result = 0;
1da177e4
LT		 1100 if (runtime->avail >= runtime->buffer_size) {
1101 /* warning: lowlevel layer MUST trigger down the hardware */
1102 goto __skip;
1103 }
1104 if (count == 1) { /* special case, faster code */
1105 *buffer = runtime->buffer[runtime->hw_ptr];
1106 result++;
1107 } else {
1108 count1 = runtime->buffer_size - runtime->hw_ptr;
1109 if (count1 > count)
1110 count1 = count;
1111 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1112 count1 = runtime->buffer_size - runtime->avail;
1113 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1114 count -= count1;
1115 result += count1;
1116 if (count > 0) {
1117 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1118 count = runtime->buffer_size - runtime->avail - count1;
1119 memcpy(buffer + count1, runtime->buffer, count);
1120 result += count;
1121 }
1122 }
1123 __skip:
06ab3003
TI		 1124 return result;
1125}
1126EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1127
1128/**
1129 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1130 * @substream: the rawmidi substream
1131 * @buffer: the buffer pointer
1132 * @count: data size to transfer
1133 *
1134 * Copies data from the internal output buffer to the given buffer.
1135 *
1136 * Call this in the interrupt handler when the midi output is ready,
1137 * and call snd_rawmidi_transmit_ack() after the transmission is
1138 * finished.
1139 *
1140 * Return: The size of copied data, or a negative error code on failure.
1141 */
1142int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1143 unsigned char *buffer, int count)
1144{
1145 struct snd_rawmidi_runtime *runtime = substream->runtime;
1146 int result;
1147 unsigned long flags;
1148
1149 spin_lock_irqsave(&runtime->lock, flags);
1150 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1da177e4
LT		 1151 spin_unlock_irqrestore(&runtime->lock, flags);
1152 return result;
1153}
6776a5d7 1154EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1da177e4
LT		 1155
1156/**
06ab3003 1157 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1da177e4 1158 * @substream: the rawmidi substream
0a11458c 1159 * @count: the transferred count
1da177e4 1160 *
06ab3003 1161 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1da177e4 1162 */
06ab3003 1163int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1da177e4 1164{
48c9d417 1165 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 1166
1167 if (runtime->buffer == NULL) {
ca20d292
TI		 1168 rmidi_dbg(substream->rmidi,
1169 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1da177e4
LT		 1170 return -EINVAL;
1171 }
7eaa943c 1172 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1da177e4
LT		 1173 runtime->hw_ptr += count;
1174 runtime->hw_ptr %= runtime->buffer_size;
1175 runtime->avail += count;
1176 substream->bytes += count;
1177 if (count > 0) {
1178 if (runtime->drain || snd_rawmidi_ready(substream))
1179 wake_up(&runtime->sleep);
1180 }
1da177e4
LT		 1181 return count;
1182}
06ab3003
TI		 1183EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1184
1185/**
1186 * snd_rawmidi_transmit_ack - acknowledge the transmission
1187 * @substream: the rawmidi substream
1188 * @count: the transferred count
1189 *
1190 * Advances the hardware pointer for the internal output buffer with
1191 * the given size and updates the condition.
1192 * Call after the transmission is finished.
1193 *
1194 * Return: The advanced size if successful, or a negative error code on failure.
1195 */
1196int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1197{
1198 struct snd_rawmidi_runtime *runtime = substream->runtime;
1199 int result;
1200 unsigned long flags;
1201
1202 spin_lock_irqsave(&runtime->lock, flags);
1203 result = __snd_rawmidi_transmit_ack(substream, count);
1204 spin_unlock_irqrestore(&runtime->lock, flags);
1205 return result;
1206}
6776a5d7 1207EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1da177e4
LT		 1208
1209/**
1210 * snd_rawmidi_transmit - copy from the buffer to the device
1211 * @substream: the rawmidi substream
df8db936 1212 * @buffer: the buffer pointer
1da177e4 1213 * @count: the data size to transfer
5bed9139 1214 *
1da177e4
LT		 1215 * Copies data from the buffer to the device and advances the pointer.
1216 *
eb7c06e8 1217 * Return: The copied size if successful, or a negative error code on failure.
1da177e4 1218 */
48c9d417
TI		 1219int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1220 unsigned char *buffer, int count)
1da177e4 1221{
06ab3003
TI		 1222 struct snd_rawmidi_runtime *runtime = substream->runtime;
1223 int result;
1224 unsigned long flags;
1225
1226 spin_lock_irqsave(&runtime->lock, flags);
219df32f 1227 if (!substream->opened)
06ab3003
TI		 1228 result = -EBADFD;
1229 else {
1230 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1231 if (count <= 0)
1232 result = count;
1233 else
1234 result = __snd_rawmidi_transmit_ack(substream, count);
1235 }
1236 spin_unlock_irqrestore(&runtime->lock, flags);
1237 return result;
1da177e4 1238}
6776a5d7 1239EXPORT_SYMBOL(snd_rawmidi_transmit);
1da177e4 1240
6aea5702
TI		 1241/**
1242 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1243 * @substream: rawmidi substream
1244 *
1245 * Return: the number of discarded bytes
1246 */
1247int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1248{
1249 struct snd_rawmidi_runtime *runtime = substream->runtime;
1250 unsigned long flags;
1251 int count = 0;
1252
1253 spin_lock_irqsave(&runtime->lock, flags);
1254 if (runtime->avail < runtime->buffer_size) {
1255 count = runtime->buffer_size - runtime->avail;
1256 __snd_rawmidi_transmit_ack(substream, count);
1257 }
1258 spin_unlock_irqrestore(&runtime->lock, flags);
1259 return count;
1260}
1261EXPORT_SYMBOL(snd_rawmidi_proceed);
1262
48c9d417 1263static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
17596a80
MŚ		 1264 const unsigned char __user *userbuf,
1265 const unsigned char *kernelbuf,
1266 long count)
1da177e4
LT		 1267{
1268 unsigned long flags;
1269 long count1, result;
48c9d417 1270 struct snd_rawmidi_runtime *runtime = substream->runtime;
81f57754 1271 unsigned long appl_ptr;
1da177e4 1272
cc85f7a6 1273 if (!kernelbuf && !userbuf)
7eaa943c
TI		 1274 return -EINVAL;
1275 if (snd_BUG_ON(!runtime->buffer))
1276 return -EINVAL;
1da177e4
LT		 1277
1278 result = 0;
1279 spin_lock_irqsave(&runtime->lock, flags);
1280 if (substream->append) {
1281 if ((long)runtime->avail < count) {
1282 spin_unlock_irqrestore(&runtime->lock, flags);
1283 return -EAGAIN;
1284 }
1285 }
1286 while (count > 0 && runtime->avail > 0) {
1287 count1 = runtime->buffer_size - runtime->appl_ptr;
1288 if (count1 > count)
1289 count1 = count;
1290 if (count1 > (long)runtime->avail)
1291 count1 = runtime->avail;
81f57754
TI		 1292
1293 /* update runtime->appl_ptr before unlocking for userbuf */
1294 appl_ptr = runtime->appl_ptr;
1295 runtime->appl_ptr += count1;
1296 runtime->appl_ptr %= runtime->buffer_size;
1297 runtime->avail -= count1;
1298
17596a80 1299 if (kernelbuf)
81f57754 1300 memcpy(runtime->buffer + appl_ptr,
17596a80
MŚ		 1301 kernelbuf + result, count1);
1302 else if (userbuf) {
1da177e4 1303 spin_unlock_irqrestore(&runtime->lock, flags);
81f57754 1304 if (copy_from_user(runtime->buffer + appl_ptr,
17596a80 1305 userbuf + result, count1)) {
1da177e4
LT		 1306 spin_lock_irqsave(&runtime->lock, flags);
1307 result = result > 0 ? result : -EFAULT;
1308 goto __end;
1309 }
1310 spin_lock_irqsave(&runtime->lock, flags);
1311 }
1da177e4 1312 result += count1;
1da177e4
LT		 1313 count -= count1;
1314 }
1315 __end:
1316 count1 = runtime->avail < runtime->buffer_size;
1317 spin_unlock_irqrestore(&runtime->lock, flags);
1318 if (count1)
1319 snd_rawmidi_output_trigger(substream, 1);
1320 return result;
1321}
1322
48c9d417
TI		 1323long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1324 const unsigned char *buf, long count)
1da177e4 1325{
17596a80 1326 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1da177e4 1327}
6776a5d7 1328EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1da177e4 1329
48c9d417
TI		 1330static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1331 size_t count, loff_t *offset)
1da177e4
LT		 1332{
1333 long result, timeout;
1334 int count1;
48c9d417
TI		 1335 struct snd_rawmidi_file *rfile;
1336 struct snd_rawmidi_runtime *runtime;
1337 struct snd_rawmidi_substream *substream;
1da177e4
LT		 1338
1339 rfile = file->private_data;
1340 substream = rfile->output;
1341 runtime = substream->runtime;
1342 /* we cannot put an atomic message to our buffer */
1343 if (substream->append && count > runtime->buffer_size)
1344 return -EIO;
1345 result = 0;
1346 while (count > 0) {
1347 spin_lock_irq(&runtime->lock);
1348 while (!snd_rawmidi_ready_append(substream, count)) {
ac6424b9 1349 wait_queue_entry_t wait;
5bed9139 1350
1da177e4
LT		 1351 if (file->f_flags & O_NONBLOCK) {
1352 spin_unlock_irq(&runtime->lock);
1353 return result > 0 ? result : -EAGAIN;
1354 }
1355 init_waitqueue_entry(&wait, current);
1356 add_wait_queue(&runtime->sleep, &wait);
1357 set_current_state(TASK_INTERRUPTIBLE);
1358 spin_unlock_irq(&runtime->lock);
1359 timeout = schedule_timeout(30 * HZ);
1360 remove_wait_queue(&runtime->sleep, &wait);
0914f796
TI		 1361 if (rfile->rmidi->card->shutdown)
1362 return -ENODEV;
1da177e4
LT		 1363 if (signal_pending(current))
1364 return result > 0 ? result : -ERESTARTSYS;
1365 if (!runtime->avail && !timeout)
1366 return result > 0 ? result : -EIO;
1367 spin_lock_irq(&runtime->lock);
1368 }
1369 spin_unlock_irq(&runtime->lock);
17596a80 1370 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1da177e4
LT		 1371 if (count1 < 0)
1372 return result > 0 ? result : count1;
1373 result += count1;
1374 buf += count1;
1375 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1376 break;
1377 count -= count1;
1378 }
6b2f3d1f 1379 if (file->f_flags & O_DSYNC) {
1da177e4
LT		 1380 spin_lock_irq(&runtime->lock);
1381 while (runtime->avail != runtime->buffer_size) {
ac6424b9 1382 wait_queue_entry_t wait;
1da177e4 1383 unsigned int last_avail = runtime->avail;
5bed9139 1384
1da177e4
LT		 1385 init_waitqueue_entry(&wait, current);
1386 add_wait_queue(&runtime->sleep, &wait);
1387 set_current_state(TASK_INTERRUPTIBLE);
1388 spin_unlock_irq(&runtime->lock);
1389 timeout = schedule_timeout(30 * HZ);
1390 remove_wait_queue(&runtime->sleep, &wait);
1391 if (signal_pending(current))
1392 return result > 0 ? result : -ERESTARTSYS;
1393 if (runtime->avail == last_avail && !timeout)
1394 return result > 0 ? result : -EIO;
1395 spin_lock_irq(&runtime->lock);
1396 }
1397 spin_unlock_irq(&runtime->lock);
1398 }
1399 return result;
1400}
1401
5bed9139 1402static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1da177e4 1403{
48c9d417
TI		 1404 struct snd_rawmidi_file *rfile;
1405 struct snd_rawmidi_runtime *runtime;
680ef72a 1406 __poll_t mask;
1da177e4
LT		 1407
1408 rfile = file->private_data;
1409 if (rfile->input != NULL) {
1410 runtime = rfile->input->runtime;
1411 snd_rawmidi_input_trigger(rfile->input, 1);
1412 poll_wait(file, &runtime->sleep, wait);
1413 }
1414 if (rfile->output != NULL) {
1415 runtime = rfile->output->runtime;
1416 poll_wait(file, &runtime->sleep, wait);
1417 }
1418 mask = 0;
1419 if (rfile->input != NULL) {
1420 if (snd_rawmidi_ready(rfile->input))
a9a08845 1421 mask |= EPOLLIN | EPOLLRDNORM;
1da177e4
LT		 1422 }
1423 if (rfile->output != NULL) {
1424 if (snd_rawmidi_ready(rfile->output))
a9a08845 1425 mask |= EPOLLOUT | EPOLLWRNORM;
1da177e4
LT		 1426 }
1427 return mask;
1428}
1429
1430/*
1431 */
1432#ifdef CONFIG_COMPAT
1433#include "rawmidi_compat.c"
1434#else
1435#define snd_rawmidi_ioctl_compat NULL
1436#endif
1437
1438/*
1da177e4
LT		 1439 */
1440
48c9d417
TI		 1441static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1442 struct snd_info_buffer *buffer)
1da177e4 1443{
48c9d417
TI		 1444 struct snd_rawmidi *rmidi;
1445 struct snd_rawmidi_substream *substream;
1446 struct snd_rawmidi_runtime *runtime;
1da177e4
LT		 1447
1448 rmidi = entry->private_data;
1449 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1a60d4c5 1450 mutex_lock(&rmidi->open_mutex);
1da177e4 1451 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
9244b2c3
JB		 1452 list_for_each_entry(substream,
1453 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1454 list) {
1da177e4
LT		 1455 snd_iprintf(buffer,
1456 "Output %d\n"
1457 " Tx bytes : %lu\n",
1458 substream->number,
1459 (unsigned long) substream->bytes);
1460 if (substream->opened) {
7584af10
CL		 1461 snd_iprintf(buffer,
1462 " Owner PID : %d\n",
1463 pid_vnr(substream->pid));
1da177e4
LT		 1464 runtime = substream->runtime;
1465 snd_iprintf(buffer,
1466 " Mode : %s\n"
1467 " Buffer size : %lu\n"
1468 " Avail : %lu\n",
1469 runtime->oss ? "OSS compatible" : "native",
1470 (unsigned long) runtime->buffer_size,
1471 (unsigned long) runtime->avail);
1472 }
1473 }
1474 }
1475 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
9244b2c3
JB		 1476 list_for_each_entry(substream,
1477 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1478 list) {
1da177e4
LT		 1479 snd_iprintf(buffer,
1480 "Input %d\n"
1481 " Rx bytes : %lu\n",
1482 substream->number,
1483 (unsigned long) substream->bytes);
1484 if (substream->opened) {
7584af10
CL		 1485 snd_iprintf(buffer,
1486 " Owner PID : %d\n",
1487 pid_vnr(substream->pid));
1da177e4
LT		 1488 runtime = substream->runtime;
1489 snd_iprintf(buffer,
1490 " Buffer size : %lu\n"
1491 " Avail : %lu\n"
1492 " Overruns : %lu\n",
1493 (unsigned long) runtime->buffer_size,
1494 (unsigned long) runtime->avail,
1495 (unsigned long) runtime->xruns);
1496 }
1497 }
1498 }
1a60d4c5 1499 mutex_unlock(&rmidi->open_mutex);
1da177e4
LT		 1500}
1501
1502/*
1503 * Register functions
1504 */
1505
5bed9139 1506static const struct file_operations snd_rawmidi_f_ops = {
1da177e4
LT		 1507 .owner = THIS_MODULE,
1508 .read = snd_rawmidi_read,
1509 .write = snd_rawmidi_write,
1510 .open = snd_rawmidi_open,
1511 .release = snd_rawmidi_release,
02f4865f 1512 .llseek = no_llseek,
1da177e4
LT		 1513 .poll = snd_rawmidi_poll,
1514 .unlocked_ioctl = snd_rawmidi_ioctl,
1515 .compat_ioctl = snd_rawmidi_ioctl_compat,
1516};
1517
48c9d417
TI		 1518static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1519 struct snd_rawmidi_str *stream,
1da177e4
LT		 1520 int direction,
1521 int count)
1522{
48c9d417 1523 struct snd_rawmidi_substream *substream;
1da177e4
LT		 1524 int idx;
1525
1da177e4 1526 for (idx = 0; idx < count; idx++) {
ca2c0966 1527 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
ec0e9937 1528 if (!substream)
1da177e4
LT		 1529 return -ENOMEM;
1530 substream->stream = direction;
1531 substream->number = idx;
1532 substream->rmidi = rmidi;
1533 substream->pstr = stream;
1534 list_add_tail(&substream->list, &stream->substreams);
1535 stream->substream_count++;
1536 }
1537 return 0;
1538}
1539
aee5012f
TI		 1540static void release_rawmidi_device(struct device *dev)
1541{
1542 kfree(container_of(dev, struct snd_rawmidi, dev));
1543}
1544
1da177e4
LT		 1545/**
1546 * snd_rawmidi_new - create a rawmidi instance
1547 * @card: the card instance
1548 * @id: the id string
1549 * @device: the device index
1550 * @output_count: the number of output streams
1551 * @input_count: the number of input streams
1552 * @rrawmidi: the pointer to store the new rawmidi instance
1553 *
1554 * Creates a new rawmidi instance.
1555 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1556 *
eb7c06e8 1557 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1558 */
48c9d417 1559int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1da177e4 1560 int output_count, int input_count,
5bed9139 1561 struct snd_rawmidi **rrawmidi)
1da177e4 1562{
48c9d417 1563 struct snd_rawmidi *rmidi;
1da177e4 1564 int err;
48c9d417 1565 static struct snd_device_ops ops = {
1da177e4
LT		 1566 .dev_free = snd_rawmidi_dev_free,
1567 .dev_register = snd_rawmidi_dev_register,
1568 .dev_disconnect = snd_rawmidi_dev_disconnect,
1da177e4
LT		 1569 };
1570
7eaa943c
TI		 1571 if (snd_BUG_ON(!card))
1572 return -ENXIO;
1573 if (rrawmidi)
1574 *rrawmidi = NULL;
ca2c0966 1575 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
ec0e9937 1576 if (!rmidi)
1da177e4
LT		 1577 return -ENOMEM;
1578 rmidi->card = card;
1579 rmidi->device = device;
1a60d4c5 1580 mutex_init(&rmidi->open_mutex);
1da177e4 1581 init_waitqueue_head(&rmidi->open_wait);
c13893d7
AM		 1582 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1583 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1584
1da177e4
LT		 1585 if (id != NULL)
1586 strlcpy(rmidi->id, id, sizeof(rmidi->id));
aee5012f
TI		 1587
1588 snd_device_initialize(&rmidi->dev, card);
1589 rmidi->dev.release = release_rawmidi_device;
1590 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1591
5bed9139
TI		 1592 err = snd_rawmidi_alloc_substreams(rmidi,
1593 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1594 SNDRV_RAWMIDI_STREAM_INPUT,
1595 input_count);
7fdc9b08
TI		 1596 if (err < 0)
1597 goto error;
5bed9139
TI		 1598 err = snd_rawmidi_alloc_substreams(rmidi,
1599 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1600 SNDRV_RAWMIDI_STREAM_OUTPUT,
1601 output_count);
7fdc9b08
TI		 1602 if (err < 0)
1603 goto error;
5bed9139 1604 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
7fdc9b08
TI		 1605 if (err < 0)
1606 goto error;
1607
7eaa943c
TI		 1608 if (rrawmidi)
1609 *rrawmidi = rmidi;
1da177e4 1610 return 0;
7fdc9b08
TI		 1611
1612 error:
1613 snd_rawmidi_free(rmidi);
1614 return err;
1da177e4 1615}
6776a5d7 1616EXPORT_SYMBOL(snd_rawmidi_new);
1da177e4 1617
48c9d417 1618static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1da177e4 1619{
48c9d417 1620 struct snd_rawmidi_substream *substream;
1da177e4
LT		 1621
1622 while (!list_empty(&stream->substreams)) {
48c9d417 1623 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1da177e4
LT		 1624 list_del(&substream->list);
1625 kfree(substream);
1626 }
1627}
1628
48c9d417 1629static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1da177e4 1630{
7eaa943c
TI		 1631 if (!rmidi)
1632 return 0;
c461482c
TI		 1633
1634 snd_info_free_entry(rmidi->proc_entry);
1635 rmidi->proc_entry = NULL;
1636 mutex_lock(&register_mutex);
1637 if (rmidi->ops && rmidi->ops->dev_unregister)
1638 rmidi->ops->dev_unregister(rmidi);
1639 mutex_unlock(&register_mutex);
1640
1da177e4
LT		 1641 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1642 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1643 if (rmidi->private_free)
1644 rmidi->private_free(rmidi);
aee5012f 1645 put_device(&rmidi->dev);
1da177e4
LT		 1646 return 0;
1647}
1648
48c9d417 1649static int snd_rawmidi_dev_free(struct snd_device *device)
1da177e4 1650{
48c9d417 1651 struct snd_rawmidi *rmidi = device->device_data;
5bed9139 1652
1da177e4
LT		 1653 return snd_rawmidi_free(rmidi);
1654}
1655
111b0cdb 1656#if IS_ENABLED(CONFIG_SND_SEQUENCER)
48c9d417 1657static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1da177e4 1658{
48c9d417 1659 struct snd_rawmidi *rmidi = device->private_data;
5bed9139 1660
1da177e4
LT		 1661 rmidi->seq_dev = NULL;
1662}
1663#endif
1664
48c9d417 1665static int snd_rawmidi_dev_register(struct snd_device *device)
1da177e4 1666{
f87135f5 1667 int err;
48c9d417 1668 struct snd_info_entry *entry;
1da177e4 1669 char name[16];
48c9d417 1670 struct snd_rawmidi *rmidi = device->device_data;
1da177e4
LT		 1671
1672 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1673 return -ENOMEM;
7fdc9b08 1674 err = 0;
1a60d4c5 1675 mutex_lock(&register_mutex);
7fdc9b08
TI		 1676 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1677 err = -EBUSY;
1678 else
1679 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
816f318b 1680 mutex_unlock(&register_mutex);
7fdc9b08
TI		 1681 if (err < 0)
1682 return err;
1683
40a4b263
TI		 1684 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1685 rmidi->card, rmidi->device,
1686 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
aee5012f
TI		 1687 if (err < 0) {
1688 rmidi_err(rmidi, "unable to register\n");
7fdc9b08 1689 goto error;
1da177e4 1690 }
7fdc9b08
TI		 1691 if (rmidi->ops && rmidi->ops->dev_register) {
1692 err = rmidi->ops->dev_register(rmidi);
1693 if (err < 0)
1694 goto error_unregister;
1da177e4
LT		 1695 }
1696#ifdef CONFIG_SND_OSSEMUL
1697 rmidi->ossreg = 0;
1698 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1699 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
f87135f5 1700 rmidi->card, 0, &snd_rawmidi_f_ops,
80d7d771 1701 rmidi) < 0) {
ca20d292
TI		 1702 rmidi_err(rmidi,
1703 "unable to register OSS rawmidi device %i:%i\n",
1704 rmidi->card->number, 0);
1da177e4
LT		 1705 } else {
1706 rmidi->ossreg++;
1707#ifdef SNDRV_OSS_INFO_DEV_MIDI
1708 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1709#endif
1710 }
1711 }
1712 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1713 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
f87135f5 1714 rmidi->card, 1, &snd_rawmidi_f_ops,
80d7d771 1715 rmidi) < 0) {
ca20d292
TI		 1716 rmidi_err(rmidi,
1717 "unable to register OSS rawmidi device %i:%i\n",
1718 rmidi->card->number, 1);
1da177e4
LT		 1719 } else {
1720 rmidi->ossreg++;
1721 }
1722 }
1723#endif /* CONFIG_SND_OSSEMUL */
1da177e4
LT		 1724 sprintf(name, "midi%d", rmidi->device);
1725 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1726 if (entry) {
1727 entry->private_data = rmidi;
1da177e4
LT		 1728 entry->c.text.read = snd_rawmidi_proc_info_read;
1729 if (snd_info_register(entry) < 0) {
1730 snd_info_free_entry(entry);
1731 entry = NULL;
1732 }
1733 }
1734 rmidi->proc_entry = entry;
111b0cdb 1735#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1da177e4
LT		 1736 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1737 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1738 rmidi->seq_dev->private_data = rmidi;
1739 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1740 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1741 snd_device_register(rmidi->card, rmidi->seq_dev);
1742 }
1743 }
1744#endif
1745 return 0;
7fdc9b08
TI		 1746
1747 error_unregister:
1748 snd_unregister_device(&rmidi->dev);
1749 error:
1750 mutex_lock(&register_mutex);
1751 list_del(&rmidi->list);
1752 mutex_unlock(&register_mutex);
1753 return err;
1da177e4
LT		 1754}
1755
48c9d417 1756static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1da177e4 1757{
48c9d417 1758 struct snd_rawmidi *rmidi = device->device_data;
0914f796 1759 int dir;
1da177e4 1760
1a60d4c5 1761 mutex_lock(&register_mutex);
0914f796
TI		 1762 mutex_lock(&rmidi->open_mutex);
1763 wake_up(&rmidi->open_wait);
f87135f5 1764 list_del_init(&rmidi->list);
0914f796
TI		 1765 for (dir = 0; dir < 2; dir++) {
1766 struct snd_rawmidi_substream *s;
5bed9139 1767
0914f796
TI		 1768 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1769 if (s->runtime)
1770 wake_up(&s->runtime->sleep);
1771 }
1772 }
1773
1da177e4
LT		 1774#ifdef CONFIG_SND_OSSEMUL
1775 if (rmidi->ossreg) {
1776 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1777 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1778#ifdef SNDRV_OSS_INFO_DEV_MIDI
1779 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1780#endif
1781 }
1782 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1783 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1784 rmidi->ossreg = 0;
1785 }
1786#endif /* CONFIG_SND_OSSEMUL */
40a4b263 1787 snd_unregister_device(&rmidi->dev);
0914f796 1788 mutex_unlock(&rmidi->open_mutex);
1a60d4c5 1789 mutex_unlock(&register_mutex);
c461482c 1790 return 0;
1da177e4
LT		 1791}
1792
1793/**
1794 * snd_rawmidi_set_ops - set the rawmidi operators
1795 * @rmidi: the rawmidi instance
1796 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1797 * @ops: the operator table
1798 *
1799 * Sets the rawmidi operators for the given stream direction.
1800 */
48c9d417 1801void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
6ba79b85 1802 const struct snd_rawmidi_ops *ops)
1da177e4 1803{
48c9d417 1804 struct snd_rawmidi_substream *substream;
5bed9139 1805
9244b2c3 1806 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1da177e4 1807 substream->ops = ops;
1da177e4 1808}
6776a5d7 1809EXPORT_SYMBOL(snd_rawmidi_set_ops);
1da177e4
LT		 1810
1811/*
1812 * ENTRY functions
1813 */
1814
1815static int __init alsa_rawmidi_init(void)
1816{
1817
1818 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1819 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1820#ifdef CONFIG_SND_OSSEMUL
1821 { int i;
1822 /* check device map table */
1823 for (i = 0; i < SNDRV_CARDS; i++) {
1824 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
ca20d292
TI		 1825 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1826 i, midi_map[i]);
1da177e4
LT		 1827 midi_map[i] = 0;
1828 }
1829 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
ca20d292
TI		 1830 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1831 i, amidi_map[i]);
1da177e4
LT		 1832 amidi_map[i] = 1;
1833 }
1834 }
1835 }
1836#endif /* CONFIG_SND_OSSEMUL */
1837 return 0;
1838}
1839
1840static void __exit alsa_rawmidi_exit(void)
1841{
1842 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1843 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1844}
1845
1846module_init(alsa_rawmidi_init)
1847module_exit(alsa_rawmidi_exit)
Linux 6.x block layer and io_uring tree(s)