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ALSA: pcm: Unexport snd_pcm_sgbuf_ops_page
[linux-2.6-block.git] / sound / core / rawmidi.c
CommitLineData
1a59d1b8 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Abstract layer for MIDI v1.0 stream
c1017a4c 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 5 */
6
1da177e4
LT		 7#include <sound/core.h>
8#include <linux/major.h>
9#include <linux/init.h>
174cd4b1 10#include <linux/sched/signal.h>
1da177e4
LT		 11#include <linux/slab.h>
12#include <linux/time.h>
13#include <linux/wait.h>
1a60d4c5 14#include <linux/mutex.h>
65a77217 15#include <linux/module.h>
1da177e4 16#include <linux/delay.h>
ef4db239 17#include <linux/mm.h>
2b1d9c8f 18#include <linux/nospec.h>
1da177e4
LT		 19#include <sound/rawmidi.h>
20#include <sound/info.h>
21#include <sound/control.h>
22#include <sound/minors.h>
23#include <sound/initval.h>
24
c1017a4c 25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4
LT		 26MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
27MODULE_LICENSE("GPL");
28
29#ifdef CONFIG_SND_OSSEMUL
6581f4e7 30static int midi_map[SNDRV_CARDS];
1da177e4
LT		 31static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
32module_param_array(midi_map, int, NULL, 0444);
33MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
34module_param_array(amidi_map, int, NULL, 0444);
35MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
36#endif /* CONFIG_SND_OSSEMUL */
37
48c9d417
TI		 38static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
39static int snd_rawmidi_dev_free(struct snd_device *device);
40static int snd_rawmidi_dev_register(struct snd_device *device);
41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
1da177e4 42
f87135f5 43static LIST_HEAD(snd_rawmidi_devices);
1a60d4c5 44static DEFINE_MUTEX(register_mutex);
1da177e4 45
ca20d292 46#define rmidi_err(rmidi, fmt, args...) \
07cc3e8b 47 dev_err(&(rmidi)->dev, fmt, ##args)
ca20d292 48#define rmidi_warn(rmidi, fmt, args...) \
07cc3e8b 49 dev_warn(&(rmidi)->dev, fmt, ##args)
ca20d292 50#define rmidi_dbg(rmidi, fmt, args...) \
07cc3e8b 51 dev_dbg(&(rmidi)->dev, fmt, ##args)
ca20d292 52
f87135f5
CL		 53static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
54{
f87135f5
CL		 55 struct snd_rawmidi *rawmidi;
56
9244b2c3 57 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
f87135f5
CL		 58 if (rawmidi->card == card && rawmidi->device == device)
59 return rawmidi;
f87135f5
CL		 60 return NULL;
61}
62
1da177e4
LT		 63static inline unsigned short snd_rawmidi_file_flags(struct file *file)
64{
65 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
66 case FMODE_WRITE:
67 return SNDRV_RAWMIDI_LFLG_OUTPUT;
68 case FMODE_READ:
69 return SNDRV_RAWMIDI_LFLG_INPUT;
70 default:
71 return SNDRV_RAWMIDI_LFLG_OPEN;
72 }
73}
74
48c9d417 75static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
1da177e4 76{
48c9d417 77 struct snd_rawmidi_runtime *runtime = substream->runtime;
5bed9139 78
1da177e4
LT		 79 return runtime->avail >= runtime->avail_min;
80}
81
48c9d417
TI		 82static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
83 size_t count)
1da177e4 84{
48c9d417 85 struct snd_rawmidi_runtime *runtime = substream->runtime;
5bed9139 86
1da177e4
LT		 87 return runtime->avail >= runtime->avail_min &&
88 (!substream->append || runtime->avail >= count);
89}
90
b3c705aa 91static void snd_rawmidi_input_event_work(struct work_struct *work)
1da177e4 92{
b3c705aa
TI		 93 struct snd_rawmidi_runtime *runtime =
94 container_of(work, struct snd_rawmidi_runtime, event_work);
5bed9139 95
b3c705aa
TI		 96 if (runtime->event)
97 runtime->event(runtime->substream);
1da177e4
LT		 98}
99
48c9d417 100static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
1da177e4 101{
48c9d417 102 struct snd_rawmidi_runtime *runtime;
1da177e4 103
5bed9139
TI		 104 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
105 if (!runtime)
1da177e4 106 return -ENOMEM;
b3c705aa 107 runtime->substream = substream;
1da177e4
LT		 108 spin_lock_init(&runtime->lock);
109 init_waitqueue_head(&runtime->sleep);
b3c705aa 110 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
1da177e4
LT		 111 runtime->event = NULL;
112 runtime->buffer_size = PAGE_SIZE;
113 runtime->avail_min = 1;
114 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
115 runtime->avail = 0;
116 else
117 runtime->avail = runtime->buffer_size;
5a7b44a8 118 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
5bed9139 119 if (!runtime->buffer) {
1da177e4
LT		 120 kfree(runtime);
121 return -ENOMEM;
122 }
123 runtime->appl_ptr = runtime->hw_ptr = 0;
124 substream->runtime = runtime;
125 return 0;
126}
127
48c9d417 128static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
1da177e4 129{
48c9d417 130 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4 131
ef4db239 132 kvfree(runtime->buffer);
1da177e4
LT		 133 kfree(runtime);
134 substream->runtime = NULL;
135 return 0;
136}
137
5bed9139 138static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 139{
219df32f
TI		 140 if (!substream->opened)
141 return;
b3c705aa 142 substream->ops->trigger(substream, up);
1da177e4
LT		 143}
144
48c9d417 145static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 146{
219df32f
TI		 147 if (!substream->opened)
148 return;
1da177e4 149 substream->ops->trigger(substream, up);
b3c705aa
TI		 150 if (!up)
151 cancel_work_sync(&substream->runtime->event_work);
1da177e4
LT		 152}
153
f5beb598
TI		 154static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
155 bool is_input)
156{
157 runtime->drain = 0;
158 runtime->appl_ptr = runtime->hw_ptr = 0;
159 runtime->avail = is_input ? 0 : runtime->buffer_size;
160}
161
162static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
163 bool is_input)
1da177e4
LT		 164{
165 unsigned long flags;
1da177e4 166
1da177e4 167 spin_lock_irqsave(&runtime->lock, flags);
f5beb598 168 __reset_runtime_ptrs(runtime, is_input);
1da177e4 169 spin_unlock_irqrestore(&runtime->lock, flags);
f5beb598
TI		 170}
171
172int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
173{
174 snd_rawmidi_output_trigger(substream, 0);
175 reset_runtime_ptrs(substream->runtime, false);
1da177e4
LT		 176 return 0;
177}
6776a5d7 178EXPORT_SYMBOL(snd_rawmidi_drop_output);
1da177e4 179
48c9d417 180int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
1da177e4
LT		 181{
182 int err;
183 long timeout;
48c9d417 184 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 185
186 err = 0;
187 runtime->drain = 1;
188 timeout = wait_event_interruptible_timeout(runtime->sleep,
189 (runtime->avail >= runtime->buffer_size),
190 10*HZ);
191 if (signal_pending(current))
192 err = -ERESTARTSYS;
193 if (runtime->avail < runtime->buffer_size && !timeout) {
ca20d292
TI		 194 rmidi_warn(substream->rmidi,
195 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
196 (long)runtime->avail, (long)runtime->buffer_size);
1da177e4
LT		 197 err = -EIO;
198 }
199 runtime->drain = 0;
200 if (err != -ERESTARTSYS) {
201 /* we need wait a while to make sure that Tx FIFOs are empty */
202 if (substream->ops->drain)
203 substream->ops->drain(substream);
204 else
205 msleep(50);
206 snd_rawmidi_drop_output(substream);
207 }
208 return err;
209}
6776a5d7 210EXPORT_SYMBOL(snd_rawmidi_drain_output);
1da177e4 211
48c9d417 212int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
1da177e4 213{
1da177e4 214 snd_rawmidi_input_trigger(substream, 0);
f5beb598 215 reset_runtime_ptrs(substream->runtime, true);
1da177e4
LT		 216 return 0;
217}
6776a5d7 218EXPORT_SYMBOL(snd_rawmidi_drain_input);
1da177e4 219
9a1b64ca
TI		 220/* look for an available substream for the given stream direction;
221 * if a specific subdevice is given, try to assign it
222 */
223static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
224 int stream, int mode,
225 struct snd_rawmidi_substream **sub_ret)
1da177e4 226{
9a1b64ca
TI		 227 struct snd_rawmidi_substream *substream;
228 struct snd_rawmidi_str *s = &rmidi->streams[stream];
229 static unsigned int info_flags[2] = {
230 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
231 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
232 };
1da177e4 233
9a1b64ca 234 if (!(rmidi->info_flags & info_flags[stream]))
f9d20283 235 return -ENXIO;
9a1b64ca
TI		 236 if (subdevice >= 0 && subdevice >= s->substream_count)
237 return -ENODEV;
9a1b64ca
TI		 238
239 list_for_each_entry(substream, &s->substreams, list) {
240 if (substream->opened) {
241 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
16fb1096
CL		 242 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
243 !substream->append)
9a1b64ca
TI		 244 continue;
245 }
246 if (subdevice < 0 || subdevice == substream->number) {
247 *sub_ret = substream;
248 return 0;
249 }
1da177e4 250 }
9a1b64ca
TI		 251 return -EAGAIN;
252}
f9d20283 253
9a1b64ca
TI		 254/* open and do ref-counting for the given substream */
255static int open_substream(struct snd_rawmidi *rmidi,
256 struct snd_rawmidi_substream *substream,
257 int mode)
258{
259 int err;
260
8579d2d7
CL		 261 if (substream->use_count == 0) {
262 err = snd_rawmidi_runtime_create(substream);
263 if (err < 0)
264 return err;
265 err = substream->ops->open(substream);
b7fe750f
CL		 266 if (err < 0) {
267 snd_rawmidi_runtime_free(substream);
8579d2d7 268 return err;
b7fe750f 269 }
8579d2d7 270 substream->opened = 1;
2d4b8420 271 substream->active_sensing = 0;
8579d2d7
CL		 272 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
273 substream->append = 1;
7584af10 274 substream->pid = get_pid(task_pid(current));
91d12c48 275 rmidi->streams[substream->stream].substream_opened++;
8579d2d7
CL		 276 }
277 substream->use_count++;
9a1b64ca
TI		 278 return 0;
279}
280
281static void close_substream(struct snd_rawmidi *rmidi,
282 struct snd_rawmidi_substream *substream,
283 int cleanup);
284
285static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
286 struct snd_rawmidi_file *rfile)
287{
288 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
289 int err;
290
291 rfile->input = rfile->output = NULL;
1da177e4 292 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
9a1b64ca
TI		 293 err = assign_substream(rmidi, subdevice,
294 SNDRV_RAWMIDI_STREAM_INPUT,
295 mode, &sinput);
296 if (err < 0)
b7fe750f 297 return err;
1da177e4
LT		 298 }
299 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
9a1b64ca
TI		 300 err = assign_substream(rmidi, subdevice,
301 SNDRV_RAWMIDI_STREAM_OUTPUT,
302 mode, &soutput);
303 if (err < 0)
b7fe750f 304 return err;
1da177e4 305 }
9a1b64ca
TI		 306
307 if (sinput) {
308 err = open_substream(rmidi, sinput, mode);
309 if (err < 0)
b7fe750f 310 return err;
1da177e4 311 }
9a1b64ca
TI		 312 if (soutput) {
313 err = open_substream(rmidi, soutput, mode);
314 if (err < 0) {
315 if (sinput)
316 close_substream(rmidi, sinput, 0);
b7fe750f 317 return err;
1da177e4 318 }
1da177e4 319 }
9a1b64ca
TI		 320
321 rfile->rmidi = rmidi;
322 rfile->input = sinput;
323 rfile->output = soutput;
1da177e4 324 return 0;
9a1b64ca
TI		 325}
326
327/* called from sound/core/seq/seq_midi.c */
328int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
5bed9139 329 int mode, struct snd_rawmidi_file *rfile)
9a1b64ca
TI		 330{
331 struct snd_rawmidi *rmidi;
7fdc9b08 332 int err = 0;
9a1b64ca
TI		 333
334 if (snd_BUG_ON(!rfile))
335 return -EINVAL;
336
337 mutex_lock(&register_mutex);
338 rmidi = snd_rawmidi_search(card, device);
7fdc9b08
TI		 339 if (!rmidi)
340 err = -ENODEV;
341 else if (!try_module_get(rmidi->card->module))
342 err = -ENXIO;
9a1b64ca 343 mutex_unlock(&register_mutex);
7fdc9b08
TI		 344 if (err < 0)
345 return err;
9a1b64ca
TI		 346
347 mutex_lock(&rmidi->open_mutex);
348 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
349 mutex_unlock(&rmidi->open_mutex);
350 if (err < 0)
351 module_put(rmidi->card->module);
1da177e4
LT		 352 return err;
353}
6776a5d7 354EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1da177e4
LT		 355
356static int snd_rawmidi_open(struct inode *inode, struct file *file)
357{
358 int maj = imajor(inode);
48c9d417 359 struct snd_card *card;
f87135f5 360 int subdevice;
1da177e4
LT		 361 unsigned short fflags;
362 int err;
48c9d417 363 struct snd_rawmidi *rmidi;
9a1b64ca 364 struct snd_rawmidi_file *rawmidi_file = NULL;
ac6424b9 365 wait_queue_entry_t wait;
1da177e4 366
5bed9139 367 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
9a1b64ca
TI		 368 return -EINVAL; /* invalid combination */
369
c5bf68fe 370 err = stream_open(inode, file);
02f4865f
TI		 371 if (err < 0)
372 return err;
373
f1902860 374 if (maj == snd_major) {
f87135f5
CL		 375 rmidi = snd_lookup_minor_data(iminor(inode),
376 SNDRV_DEVICE_TYPE_RAWMIDI);
1da177e4 377#ifdef CONFIG_SND_OSSEMUL
f1902860 378 } else if (maj == SOUND_MAJOR) {
f87135f5
CL		 379 rmidi = snd_lookup_oss_minor_data(iminor(inode),
380 SNDRV_OSS_DEVICE_TYPE_MIDI);
1da177e4 381#endif
f1902860 382 } else
1da177e4 383 return -ENXIO;
1da177e4 384
1da177e4
LT		 385 if (rmidi == NULL)
386 return -ENODEV;
9a1b64ca 387
a0830dbd
TI		 388 if (!try_module_get(rmidi->card->module)) {
389 snd_card_unref(rmidi->card);
9a1b64ca 390 return -ENXIO;
a0830dbd 391 }
9a1b64ca
TI		 392
393 mutex_lock(&rmidi->open_mutex);
1da177e4
LT		 394 card = rmidi->card;
395 err = snd_card_file_add(card, file);
396 if (err < 0)
9a1b64ca 397 goto __error_card;
1da177e4 398 fflags = snd_rawmidi_file_flags(file);
f1902860 399 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
1da177e4 400 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
1da177e4
LT		 401 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
402 if (rawmidi_file == NULL) {
9a1b64ca
TI		 403 err = -ENOMEM;
404 goto __error;
1da177e4
LT		 405 }
406 init_waitqueue_entry(&wait, current);
407 add_wait_queue(&rmidi->open_wait, &wait);
1da177e4 408 while (1) {
23c18d4b 409 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
9a1b64ca 410 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
1da177e4
LT		 411 if (err >= 0)
412 break;
413 if (err == -EAGAIN) {
414 if (file->f_flags & O_NONBLOCK) {
415 err = -EBUSY;
416 break;
417 }
418 } else
419 break;
420 set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5 421 mutex_unlock(&rmidi->open_mutex);
1da177e4 422 schedule();
1a60d4c5 423 mutex_lock(&rmidi->open_mutex);
0914f796
TI		 424 if (rmidi->card->shutdown) {
425 err = -ENODEV;
426 break;
427 }
1da177e4
LT		 428 if (signal_pending(current)) {
429 err = -ERESTARTSYS;
430 break;
431 }
432 }
9a1b64ca
TI		 433 remove_wait_queue(&rmidi->open_wait, &wait);
434 if (err < 0) {
435 kfree(rawmidi_file);
436 goto __error;
437 }
1da177e4
LT		 438#ifdef CONFIG_SND_OSSEMUL
439 if (rawmidi_file->input && rawmidi_file->input->runtime)
440 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
441 if (rawmidi_file->output && rawmidi_file->output->runtime)
442 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
443#endif
9a1b64ca
TI		 444 file->private_data = rawmidi_file;
445 mutex_unlock(&rmidi->open_mutex);
a0830dbd 446 snd_card_unref(rmidi->card);
9a1b64ca
TI		 447 return 0;
448
449 __error:
450 snd_card_file_remove(card, file);
451 __error_card:
1a60d4c5 452 mutex_unlock(&rmidi->open_mutex);
9a1b64ca 453 module_put(rmidi->card->module);
a0830dbd 454 snd_card_unref(rmidi->card);
1da177e4
LT		 455 return err;
456}
457
9a1b64ca
TI		 458static void close_substream(struct snd_rawmidi *rmidi,
459 struct snd_rawmidi_substream *substream,
460 int cleanup)
1da177e4 461{
9a1b64ca
TI		 462 if (--substream->use_count)
463 return;
1da177e4 464
9a1b64ca
TI		 465 if (cleanup) {
466 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
467 snd_rawmidi_input_trigger(substream, 0);
468 else {
1da177e4
LT		 469 if (substream->active_sensing) {
470 unsigned char buf = 0xfe;
9a1b64ca
TI		 471 /* sending single active sensing message
472 * to shut the device up
473 */
1da177e4
LT		 474 snd_rawmidi_kernel_write(substream, &buf, 1);
475 }
476 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
477 snd_rawmidi_output_trigger(substream, 0);
1da177e4 478 }
1da177e4 479 }
9a1b64ca
TI		 480 substream->ops->close(substream);
481 if (substream->runtime->private_free)
482 substream->runtime->private_free(substream);
483 snd_rawmidi_runtime_free(substream);
484 substream->opened = 0;
485 substream->append = 0;
7584af10
CL		 486 put_pid(substream->pid);
487 substream->pid = NULL;
91d12c48 488 rmidi->streams[substream->stream].substream_opened--;
9a1b64ca
TI		 489}
490
491static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
492{
493 struct snd_rawmidi *rmidi;
494
495 rmidi = rfile->rmidi;
496 mutex_lock(&rmidi->open_mutex);
497 if (rfile->input) {
498 close_substream(rmidi, rfile->input, 1);
499 rfile->input = NULL;
500 }
501 if (rfile->output) {
502 close_substream(rmidi, rfile->output, 1);
503 rfile->output = NULL;
504 }
505 rfile->rmidi = NULL;
1a60d4c5 506 mutex_unlock(&rmidi->open_mutex);
9a1b64ca
TI		 507 wake_up(&rmidi->open_wait);
508}
509
510/* called from sound/core/seq/seq_midi.c */
511int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
512{
513 struct snd_rawmidi *rmidi;
514
515 if (snd_BUG_ON(!rfile))
516 return -ENXIO;
5bed9139 517
9a1b64ca
TI		 518 rmidi = rfile->rmidi;
519 rawmidi_release_priv(rfile);
1da177e4
LT		 520 module_put(rmidi->card->module);
521 return 0;
522}
6776a5d7 523EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1da177e4
LT		 524
525static int snd_rawmidi_release(struct inode *inode, struct file *file)
526{
48c9d417
TI		 527 struct snd_rawmidi_file *rfile;
528 struct snd_rawmidi *rmidi;
aa73aec6 529 struct module *module;
1da177e4
LT		 530
531 rfile = file->private_data;
1da177e4 532 rmidi = rfile->rmidi;
9a1b64ca 533 rawmidi_release_priv(rfile);
1da177e4 534 kfree(rfile);
aa73aec6 535 module = rmidi->card->module;
1da177e4 536 snd_card_file_remove(rmidi->card, file);
aa73aec6 537 module_put(module);
9a1b64ca 538 return 0;
1da177e4
LT		 539}
540
18612048
AB		 541static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
542 struct snd_rawmidi_info *info)
1da177e4 543{
48c9d417 544 struct snd_rawmidi *rmidi;
5bed9139 545
1da177e4
LT		 546 if (substream == NULL)
547 return -ENODEV;
548 rmidi = substream->rmidi;
549 memset(info, 0, sizeof(*info));
550 info->card = rmidi->card->number;
551 info->device = rmidi->device;
552 info->subdevice = substream->number;
553 info->stream = substream->stream;
554 info->flags = rmidi->info_flags;
555 strcpy(info->id, rmidi->id);
556 strcpy(info->name, rmidi->name);
557 strcpy(info->subname, substream->name);
558 info->subdevices_count = substream->pstr->substream_count;
559 info->subdevices_avail = (substream->pstr->substream_count -
560 substream->pstr->substream_opened);
561 return 0;
562}
563
48c9d417 564static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
5bed9139 565 struct snd_rawmidi_info __user *_info)
1da177e4 566{
48c9d417 567 struct snd_rawmidi_info info;
1da177e4 568 int err;
5bed9139
TI		 569
570 err = snd_rawmidi_info(substream, &info);
571 if (err < 0)
1da177e4 572 return err;
48c9d417 573 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
1da177e4
LT		 574 return -EFAULT;
575 return 0;
576}
577
c1cfd902
TI		 578static int __snd_rawmidi_info_select(struct snd_card *card,
579 struct snd_rawmidi_info *info)
1da177e4 580{
48c9d417
TI		 581 struct snd_rawmidi *rmidi;
582 struct snd_rawmidi_str *pstr;
583 struct snd_rawmidi_substream *substream;
f87135f5 584
f87135f5 585 rmidi = snd_rawmidi_search(card, info->device);
a106cd3d
CL		 586 if (!rmidi)
587 return -ENXIO;
1da177e4
LT		 588 if (info->stream < 0 || info->stream > 1)
589 return -EINVAL;
2b1d9c8f 590 info->stream = array_index_nospec(info->stream, 2);
1da177e4
LT		 591 pstr = &rmidi->streams[info->stream];
592 if (pstr->substream_count == 0)
593 return -ENOENT;
594 if (info->subdevice >= pstr->substream_count)
595 return -ENXIO;
9244b2c3 596 list_for_each_entry(substream, &pstr->substreams, list) {
1da177e4
LT		 597 if ((unsigned int)substream->number == info->subdevice)
598 return snd_rawmidi_info(substream, info);
599 }
600 return -ENXIO;
601}
c1cfd902
TI		 602
603int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
604{
605 int ret;
606
607 mutex_lock(&register_mutex);
608 ret = __snd_rawmidi_info_select(card, info);
609 mutex_unlock(&register_mutex);
610 return ret;
611}
6776a5d7 612EXPORT_SYMBOL(snd_rawmidi_info_select);
1da177e4 613
48c9d417
TI		 614static int snd_rawmidi_info_select_user(struct snd_card *card,
615 struct snd_rawmidi_info __user *_info)
1da177e4
LT		 616{
617 int err;
48c9d417 618 struct snd_rawmidi_info info;
5bed9139 619
1da177e4
LT		 620 if (get_user(info.device, &_info->device))
621 return -EFAULT;
622 if (get_user(info.stream, &_info->stream))
623 return -EFAULT;
624 if (get_user(info.subdevice, &_info->subdevice))
625 return -EFAULT;
5bed9139
TI		 626 err = snd_rawmidi_info_select(card, &info);
627 if (err < 0)
1da177e4 628 return err;
48c9d417 629 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
1da177e4
LT		 630 return -EFAULT;
631 return 0;
632}
633
f5beb598
TI		 634static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
635 struct snd_rawmidi_params *params,
636 bool is_input)
1da177e4 637{
39675f7a 638 char *newbuf, *oldbuf;
5bed9139 639
5bed9139 640 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
1da177e4 641 return -EINVAL;
5bed9139 642 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
1da177e4 643 return -EINVAL;
1da177e4 644 if (params->buffer_size != runtime->buffer_size) {
5a7b44a8 645 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
4fa95ef6 646 if (!newbuf)
1da177e4 647 return -ENOMEM;
39675f7a
TI		 648 spin_lock_irq(&runtime->lock);
649 oldbuf = runtime->buffer;
1da177e4
LT		 650 runtime->buffer = newbuf;
651 runtime->buffer_size = params->buffer_size;
f5beb598 652 __reset_runtime_ptrs(runtime, is_input);
39675f7a 653 spin_unlock_irq(&runtime->lock);
ef4db239 654 kvfree(oldbuf);
1da177e4
LT		 655 }
656 runtime->avail_min = params->avail_min;
1da177e4
LT		 657 return 0;
658}
f5beb598
TI		 659
660int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
661 struct snd_rawmidi_params *params)
662{
663 if (substream->append && substream->use_count > 1)
664 return -EBUSY;
665 snd_rawmidi_drain_output(substream);
666 substream->active_sensing = !params->no_active_sensing;
667 return resize_runtime_buffer(substream->runtime, params, false);
668}
6776a5d7 669EXPORT_SYMBOL(snd_rawmidi_output_params);
1da177e4 670
48c9d417 671int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
5bed9139 672 struct snd_rawmidi_params *params)
1da177e4 673{
1da177e4 674 snd_rawmidi_drain_input(substream);
f5beb598 675 return resize_runtime_buffer(substream->runtime, params, true);
1da177e4 676}
6776a5d7 677EXPORT_SYMBOL(snd_rawmidi_input_params);
1da177e4 678
48c9d417 679static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
5bed9139 680 struct snd_rawmidi_status *status)
1da177e4 681{
48c9d417 682 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 683
684 memset(status, 0, sizeof(*status));
685 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
686 spin_lock_irq(&runtime->lock);
687 status->avail = runtime->avail;
688 spin_unlock_irq(&runtime->lock);
689 return 0;
690}
691
48c9d417 692static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
5bed9139 693 struct snd_rawmidi_status *status)
1da177e4 694{
48c9d417 695 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 696
697 memset(status, 0, sizeof(*status));
698 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
699 spin_lock_irq(&runtime->lock);
700 status->avail = runtime->avail;
701 status->xruns = runtime->xruns;
702 runtime->xruns = 0;
703 spin_unlock_irq(&runtime->lock);
704 return 0;
705}
706
707static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
708{
48c9d417 709 struct snd_rawmidi_file *rfile;
1da177e4
LT		 710 void __user *argp = (void __user *)arg;
711
712 rfile = file->private_data;
713 if (((cmd >> 8) & 0xff) != 'W')
714 return -ENOTTY;
715 switch (cmd) {
716 case SNDRV_RAWMIDI_IOCTL_PVERSION:
717 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
718 case SNDRV_RAWMIDI_IOCTL_INFO:
719 {
48c9d417
TI		 720 int stream;
721 struct snd_rawmidi_info __user *info = argp;
5bed9139 722
1da177e4
LT		 723 if (get_user(stream, &info->stream))
724 return -EFAULT;
725 switch (stream) {
726 case SNDRV_RAWMIDI_STREAM_INPUT:
727 return snd_rawmidi_info_user(rfile->input, info);
728 case SNDRV_RAWMIDI_STREAM_OUTPUT:
729 return snd_rawmidi_info_user(rfile->output, info);
730 default:
731 return -EINVAL;
732 }
733 }
734 case SNDRV_RAWMIDI_IOCTL_PARAMS:
735 {
48c9d417 736 struct snd_rawmidi_params params;
5bed9139 737
48c9d417 738 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
1da177e4
LT		 739 return -EFAULT;
740 switch (params.stream) {
741 case SNDRV_RAWMIDI_STREAM_OUTPUT:
742 if (rfile->output == NULL)
743 return -EINVAL;
744 return snd_rawmidi_output_params(rfile->output, &params);
745 case SNDRV_RAWMIDI_STREAM_INPUT:
746 if (rfile->input == NULL)
747 return -EINVAL;
748 return snd_rawmidi_input_params(rfile->input, &params);
749 default:
750 return -EINVAL;
751 }
752 }
753 case SNDRV_RAWMIDI_IOCTL_STATUS:
754 {
755 int err = 0;
48c9d417 756 struct snd_rawmidi_status status;
5bed9139 757
48c9d417 758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
1da177e4
LT		 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;
48c9d417 776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
1da177e4
LT		 777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
5bed9139 783
1da177e4
LT		 784 if (get_user(val, (int __user *) argp))
785 return -EFAULT;
786 switch (val) {
787 case SNDRV_RAWMIDI_STREAM_OUTPUT:
788 if (rfile->output == NULL)
789 return -EINVAL;
790 return snd_rawmidi_drop_output(rfile->output);
791 default:
792 return -EINVAL;
793 }
794 }
795 case SNDRV_RAWMIDI_IOCTL_DRAIN:
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_drain_output(rfile->output);
806 case SNDRV_RAWMIDI_STREAM_INPUT:
807 if (rfile->input == NULL)
808 return -EINVAL;
809 return snd_rawmidi_drain_input(rfile->input);
810 default:
811 return -EINVAL;
812 }
813 }
1da177e4 814 default:
ca20d292
TI		 815 rmidi_dbg(rfile->rmidi,
816 "rawmidi: unknown command = 0x%x\n", cmd);
1da177e4
LT		 817 }
818 return -ENOTTY;
819}
820
48c9d417
TI		 821static int snd_rawmidi_control_ioctl(struct snd_card *card,
822 struct snd_ctl_file *control,
1da177e4
LT		 823 unsigned int cmd,
824 unsigned long arg)
825{
826 void __user *argp = (void __user *)arg;
1da177e4 827
1da177e4
LT		 828 switch (cmd) {
829 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
830 {
831 int device;
5bed9139 832
1da177e4
LT		 833 if (get_user(device, (int __user *)argp))
834 return -EFAULT;
a7a13d06
DC		 835 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
836 device = SNDRV_RAWMIDI_DEVICES - 1;
1a60d4c5 837 mutex_lock(&register_mutex);
1da177e4
LT		 838 device = device < 0 ? 0 : device + 1;
839 while (device < SNDRV_RAWMIDI_DEVICES) {
f87135f5 840 if (snd_rawmidi_search(card, device))
1da177e4
LT		 841 break;
842 device++;
843 }
844 if (device == SNDRV_RAWMIDI_DEVICES)
845 device = -1;
1a60d4c5 846 mutex_unlock(&register_mutex);
1da177e4
LT		 847 if (put_user(device, (int __user *)argp))
848 return -EFAULT;
849 return 0;
850 }
851 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
852 {
853 int val;
5bed9139 854
1da177e4
LT		 855 if (get_user(val, (int __user *)argp))
856 return -EFAULT;
23c18d4b 857 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1da177e4
LT		 858 return 0;
859 }
860 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
861 return snd_rawmidi_info_select_user(card, argp);
862 }
863 return -ENOIOCTLCMD;
864}
865
866/**
867 * snd_rawmidi_receive - receive the input data from the device
868 * @substream: the rawmidi substream
869 * @buffer: the buffer pointer
870 * @count: the data size to read
871 *
872 * Reads the data from the internal buffer.
873 *
eb7c06e8 874 * Return: The size of read data, or a negative error code on failure.
1da177e4 875 */
48c9d417
TI		 876int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
877 const unsigned char *buffer, int count)
1da177e4
LT		 878{
879 unsigned long flags;
880 int result = 0, count1;
48c9d417 881 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4 882
219df32f
TI		 883 if (!substream->opened)
884 return -EBADFD;
1da177e4 885 if (runtime->buffer == NULL) {
ca20d292
TI		 886 rmidi_dbg(substream->rmidi,
887 "snd_rawmidi_receive: input is not active!!!\n");
1da177e4
LT		 888 return -EINVAL;
889 }
890 spin_lock_irqsave(&runtime->lock, flags);
891 if (count == 1) { /* special case, faster code */
892 substream->bytes++;
893 if (runtime->avail < runtime->buffer_size) {
894 runtime->buffer[runtime->hw_ptr++] = buffer[0];
895 runtime->hw_ptr %= runtime->buffer_size;
896 runtime->avail++;
897 result++;
898 } else {
899 runtime->xruns++;
900 }
901 } else {
902 substream->bytes += count;
903 count1 = runtime->buffer_size - runtime->hw_ptr;
904 if (count1 > count)
905 count1 = count;
906 if (count1 > (int)(runtime->buffer_size - runtime->avail))
907 count1 = runtime->buffer_size - runtime->avail;
908 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
909 runtime->hw_ptr += count1;
910 runtime->hw_ptr %= runtime->buffer_size;
911 runtime->avail += count1;
912 count -= count1;
913 result += count1;
914 if (count > 0) {
915 buffer += count1;
916 count1 = count;
917 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
918 count1 = runtime->buffer_size - runtime->avail;
919 runtime->xruns += count - count1;
920 }
921 if (count1 > 0) {
922 memcpy(runtime->buffer, buffer, count1);
923 runtime->hw_ptr = count1;
924 runtime->avail += count1;
925 result += count1;
926 }
927 }
928 }
929 if (result > 0) {
930 if (runtime->event)
b3c705aa 931 schedule_work(&runtime->event_work);
1da177e4
LT		 932 else if (snd_rawmidi_ready(substream))
933 wake_up(&runtime->sleep);
934 }
935 spin_unlock_irqrestore(&runtime->lock, flags);
936 return result;
937}
6776a5d7 938EXPORT_SYMBOL(snd_rawmidi_receive);
1da177e4 939
48c9d417 940static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
17596a80
MŚ		 941 unsigned char __user *userbuf,
942 unsigned char *kernelbuf, long count)
1da177e4
LT		 943{
944 unsigned long flags;
945 long result = 0, count1;
48c9d417 946 struct snd_rawmidi_runtime *runtime = substream->runtime;
81f57754 947 unsigned long appl_ptr;
1da177e4 948
81f57754 949 spin_lock_irqsave(&runtime->lock, flags);
1da177e4
LT		 950 while (count > 0 && runtime->avail) {
951 count1 = runtime->buffer_size - runtime->appl_ptr;
952 if (count1 > count)
953 count1 = count;
1da177e4
LT		 954 if (count1 > (int)runtime->avail)
955 count1 = runtime->avail;
81f57754
TI		 956
957 /* update runtime->appl_ptr before unlocking for userbuf */
958 appl_ptr = runtime->appl_ptr;
959 runtime->appl_ptr += count1;
960 runtime->appl_ptr %= runtime->buffer_size;
961 runtime->avail -= count1;
962
17596a80 963 if (kernelbuf)
81f57754 964 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
17596a80 965 if (userbuf) {
1da177e4 966 spin_unlock_irqrestore(&runtime->lock, flags);
17596a80 967 if (copy_to_user(userbuf + result,
81f57754 968 runtime->buffer + appl_ptr, count1)) {
1da177e4
LT		 969 return result > 0 ? result : -EFAULT;
970 }
971 spin_lock_irqsave(&runtime->lock, flags);
972 }
1da177e4
LT		 973 result += count1;
974 count -= count1;
975 }
81f57754 976 spin_unlock_irqrestore(&runtime->lock, flags);
1da177e4
LT		 977 return result;
978}
979
48c9d417
TI		 980long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
981 unsigned char *buf, long count)
1da177e4
LT		 982{
983 snd_rawmidi_input_trigger(substream, 1);
17596a80 984 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1da177e4 985}
6776a5d7 986EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1da177e4 987
48c9d417
TI		 988static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
989 loff_t *offset)
1da177e4
LT		 990{
991 long result;
992 int count1;
48c9d417
TI		 993 struct snd_rawmidi_file *rfile;
994 struct snd_rawmidi_substream *substream;
995 struct snd_rawmidi_runtime *runtime;
1da177e4
LT		 996
997 rfile = file->private_data;
998 substream = rfile->input;
999 if (substream == NULL)
1000 return -EIO;
1001 runtime = substream->runtime;
1002 snd_rawmidi_input_trigger(substream, 1);
1003 result = 0;
1004 while (count > 0) {
1005 spin_lock_irq(&runtime->lock);
1006 while (!snd_rawmidi_ready(substream)) {
ac6424b9 1007 wait_queue_entry_t wait;
5bed9139 1008
1da177e4
LT		 1009 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1010 spin_unlock_irq(&runtime->lock);
1011 return result > 0 ? result : -EAGAIN;
1012 }
1013 init_waitqueue_entry(&wait, current);
1014 add_wait_queue(&runtime->sleep, &wait);
1015 set_current_state(TASK_INTERRUPTIBLE);
1016 spin_unlock_irq(&runtime->lock);
1017 schedule();
1018 remove_wait_queue(&runtime->sleep, &wait);
0914f796
TI		 1019 if (rfile->rmidi->card->shutdown)
1020 return -ENODEV;
1da177e4
LT		 1021 if (signal_pending(current))
1022 return result > 0 ? result : -ERESTARTSYS;
1023 if (!runtime->avail)
1024 return result > 0 ? result : -EIO;
1025 spin_lock_irq(&runtime->lock);
1026 }
1027 spin_unlock_irq(&runtime->lock);
4d23359b 1028 count1 = snd_rawmidi_kernel_read1(substream,
17596a80
MŚ		 1029 (unsigned char __user *)buf,
1030 NULL/*kernelbuf*/,
1031 count);
1da177e4
LT		 1032 if (count1 < 0)
1033 return result > 0 ? result : count1;
1034 result += count1;
1035 buf += count1;
1036 count -= count1;
1037 }
1038 return result;
1039}
1040
1041/**
1042 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1043 * @substream: the rawmidi substream
eb7c06e8
YB		 1044 *
1045 * Return: 1 if the internal output buffer is empty, 0 if not.
1da177e4 1046 */
48c9d417 1047int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1da177e4 1048{
48c9d417 1049 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 1050 int result;
1051 unsigned long flags;
1052
1053 if (runtime->buffer == NULL) {
ca20d292
TI		 1054 rmidi_dbg(substream->rmidi,
1055 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1da177e4
LT		 1056 return 1;
1057 }
1058 spin_lock_irqsave(&runtime->lock, flags);
1059 result = runtime->avail >= runtime->buffer_size;
1060 spin_unlock_irqrestore(&runtime->lock, flags);
5bed9139 1061 return result;
1da177e4 1062}
6776a5d7 1063EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1da177e4
LT		 1064
1065/**
06ab3003 1066 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1da177e4
LT		 1067 * @substream: the rawmidi substream
1068 * @buffer: the buffer pointer
1069 * @count: data size to transfer
1070 *
06ab3003 1071 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1da177e4 1072 */
06ab3003 1073int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
48c9d417 1074 unsigned char *buffer, int count)
1da177e4 1075{
1da177e4 1076 int result, count1;
48c9d417 1077 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 1078
1079 if (runtime->buffer == NULL) {
ca20d292
TI		 1080 rmidi_dbg(substream->rmidi,
1081 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1da177e4
LT		 1082 return -EINVAL;
1083 }
1084 result = 0;
1da177e4
LT		 1085 if (runtime->avail >= runtime->buffer_size) {
1086 /* warning: lowlevel layer MUST trigger down the hardware */
1087 goto __skip;
1088 }
1089 if (count == 1) { /* special case, faster code */
1090 *buffer = runtime->buffer[runtime->hw_ptr];
1091 result++;
1092 } else {
1093 count1 = runtime->buffer_size - runtime->hw_ptr;
1094 if (count1 > count)
1095 count1 = count;
1096 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1097 count1 = runtime->buffer_size - runtime->avail;
1098 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1099 count -= count1;
1100 result += count1;
1101 if (count > 0) {
1102 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1103 count = runtime->buffer_size - runtime->avail - count1;
1104 memcpy(buffer + count1, runtime->buffer, count);
1105 result += count;
1106 }
1107 }
1108 __skip:
06ab3003
TI		 1109 return result;
1110}
1111EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1112
1113/**
1114 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1115 * @substream: the rawmidi substream
1116 * @buffer: the buffer pointer
1117 * @count: data size to transfer
1118 *
1119 * Copies data from the internal output buffer to the given buffer.
1120 *
1121 * Call this in the interrupt handler when the midi output is ready,
1122 * and call snd_rawmidi_transmit_ack() after the transmission is
1123 * finished.
1124 *
1125 * Return: The size of copied data, or a negative error code on failure.
1126 */
1127int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1128 unsigned char *buffer, int count)
1129{
1130 struct snd_rawmidi_runtime *runtime = substream->runtime;
1131 int result;
1132 unsigned long flags;
1133
1134 spin_lock_irqsave(&runtime->lock, flags);
1135 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1da177e4
LT		 1136 spin_unlock_irqrestore(&runtime->lock, flags);
1137 return result;
1138}
6776a5d7 1139EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1da177e4
LT		 1140
1141/**
06ab3003 1142 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1da177e4 1143 * @substream: the rawmidi substream
0a11458c 1144 * @count: the transferred count
1da177e4 1145 *
06ab3003 1146 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1da177e4 1147 */
06ab3003 1148int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1da177e4 1149{
48c9d417 1150 struct snd_rawmidi_runtime *runtime = substream->runtime;
1da177e4
LT		 1151
1152 if (runtime->buffer == NULL) {
ca20d292
TI		 1153 rmidi_dbg(substream->rmidi,
1154 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1da177e4
LT		 1155 return -EINVAL;
1156 }
7eaa943c 1157 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1da177e4
LT		 1158 runtime->hw_ptr += count;
1159 runtime->hw_ptr %= runtime->buffer_size;
1160 runtime->avail += count;
1161 substream->bytes += count;
1162 if (count > 0) {
1163 if (runtime->drain || snd_rawmidi_ready(substream))
1164 wake_up(&runtime->sleep);
1165 }
1da177e4
LT		 1166 return count;
1167}
06ab3003
TI		 1168EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1169
1170/**
1171 * snd_rawmidi_transmit_ack - acknowledge the transmission
1172 * @substream: the rawmidi substream
1173 * @count: the transferred count
1174 *
1175 * Advances the hardware pointer for the internal output buffer with
1176 * the given size and updates the condition.
1177 * Call after the transmission is finished.
1178 *
1179 * Return: The advanced size if successful, or a negative error code on failure.
1180 */
1181int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1182{
1183 struct snd_rawmidi_runtime *runtime = substream->runtime;
1184 int result;
1185 unsigned long flags;
1186
1187 spin_lock_irqsave(&runtime->lock, flags);
1188 result = __snd_rawmidi_transmit_ack(substream, count);
1189 spin_unlock_irqrestore(&runtime->lock, flags);
1190 return result;
1191}
6776a5d7 1192EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1da177e4
LT		 1193
1194/**
1195 * snd_rawmidi_transmit - copy from the buffer to the device
1196 * @substream: the rawmidi substream
df8db936 1197 * @buffer: the buffer pointer
1da177e4 1198 * @count: the data size to transfer
5bed9139 1199 *
1da177e4
LT		 1200 * Copies data from the buffer to the device and advances the pointer.
1201 *
eb7c06e8 1202 * Return: The copied size if successful, or a negative error code on failure.
1da177e4 1203 */
48c9d417
TI		 1204int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1205 unsigned char *buffer, int count)
1da177e4 1206{
06ab3003
TI		 1207 struct snd_rawmidi_runtime *runtime = substream->runtime;
1208 int result;
1209 unsigned long flags;
1210
1211 spin_lock_irqsave(&runtime->lock, flags);
219df32f 1212 if (!substream->opened)
06ab3003
TI		 1213 result = -EBADFD;
1214 else {
1215 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1216 if (count <= 0)
1217 result = count;
1218 else
1219 result = __snd_rawmidi_transmit_ack(substream, count);
1220 }
1221 spin_unlock_irqrestore(&runtime->lock, flags);
1222 return result;
1da177e4 1223}
6776a5d7 1224EXPORT_SYMBOL(snd_rawmidi_transmit);
1da177e4 1225
6aea5702
TI		 1226/**
1227 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1228 * @substream: rawmidi substream
1229 *
1230 * Return: the number of discarded bytes
1231 */
1232int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1233{
1234 struct snd_rawmidi_runtime *runtime = substream->runtime;
1235 unsigned long flags;
1236 int count = 0;
1237
1238 spin_lock_irqsave(&runtime->lock, flags);
1239 if (runtime->avail < runtime->buffer_size) {
1240 count = runtime->buffer_size - runtime->avail;
1241 __snd_rawmidi_transmit_ack(substream, count);
1242 }
1243 spin_unlock_irqrestore(&runtime->lock, flags);
1244 return count;
1245}
1246EXPORT_SYMBOL(snd_rawmidi_proceed);
1247
48c9d417 1248static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
17596a80
MŚ		 1249 const unsigned char __user *userbuf,
1250 const unsigned char *kernelbuf,
1251 long count)
1da177e4
LT		 1252{
1253 unsigned long flags;
1254 long count1, result;
48c9d417 1255 struct snd_rawmidi_runtime *runtime = substream->runtime;
81f57754 1256 unsigned long appl_ptr;
1da177e4 1257
cc85f7a6 1258 if (!kernelbuf && !userbuf)
7eaa943c
TI		 1259 return -EINVAL;
1260 if (snd_BUG_ON(!runtime->buffer))
1261 return -EINVAL;
1da177e4
LT		 1262
1263 result = 0;
1264 spin_lock_irqsave(&runtime->lock, flags);
1265 if (substream->append) {
1266 if ((long)runtime->avail < count) {
1267 spin_unlock_irqrestore(&runtime->lock, flags);
1268 return -EAGAIN;
1269 }
1270 }
1271 while (count > 0 && runtime->avail > 0) {
1272 count1 = runtime->buffer_size - runtime->appl_ptr;
1273 if (count1 > count)
1274 count1 = count;
1275 if (count1 > (long)runtime->avail)
1276 count1 = runtime->avail;
81f57754
TI		 1277
1278 /* update runtime->appl_ptr before unlocking for userbuf */
1279 appl_ptr = runtime->appl_ptr;
1280 runtime->appl_ptr += count1;
1281 runtime->appl_ptr %= runtime->buffer_size;
1282 runtime->avail -= count1;
1283
17596a80 1284 if (kernelbuf)
81f57754 1285 memcpy(runtime->buffer + appl_ptr,
17596a80
MŚ		 1286 kernelbuf + result, count1);
1287 else if (userbuf) {
1da177e4 1288 spin_unlock_irqrestore(&runtime->lock, flags);
81f57754 1289 if (copy_from_user(runtime->buffer + appl_ptr,
17596a80 1290 userbuf + result, count1)) {
1da177e4
LT		 1291 spin_lock_irqsave(&runtime->lock, flags);
1292 result = result > 0 ? result : -EFAULT;
1293 goto __end;
1294 }
1295 spin_lock_irqsave(&runtime->lock, flags);
1296 }
1da177e4 1297 result += count1;
1da177e4
LT		 1298 count -= count1;
1299 }
1300 __end:
1301 count1 = runtime->avail < runtime->buffer_size;
1302 spin_unlock_irqrestore(&runtime->lock, flags);
1303 if (count1)
1304 snd_rawmidi_output_trigger(substream, 1);
1305 return result;
1306}
1307
48c9d417
TI		 1308long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1309 const unsigned char *buf, long count)
1da177e4 1310{
17596a80 1311 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1da177e4 1312}
6776a5d7 1313EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1da177e4 1314
48c9d417
TI		 1315static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1316 size_t count, loff_t *offset)
1da177e4
LT		 1317{
1318 long result, timeout;
1319 int count1;
48c9d417
TI		 1320 struct snd_rawmidi_file *rfile;
1321 struct snd_rawmidi_runtime *runtime;
1322 struct snd_rawmidi_substream *substream;
1da177e4
LT		 1323
1324 rfile = file->private_data;
1325 substream = rfile->output;
1326 runtime = substream->runtime;
1327 /* we cannot put an atomic message to our buffer */
1328 if (substream->append && count > runtime->buffer_size)
1329 return -EIO;
1330 result = 0;
1331 while (count > 0) {
1332 spin_lock_irq(&runtime->lock);
1333 while (!snd_rawmidi_ready_append(substream, count)) {
ac6424b9 1334 wait_queue_entry_t wait;
5bed9139 1335
1da177e4
LT		 1336 if (file->f_flags & O_NONBLOCK) {
1337 spin_unlock_irq(&runtime->lock);
1338 return result > 0 ? result : -EAGAIN;
1339 }
1340 init_waitqueue_entry(&wait, current);
1341 add_wait_queue(&runtime->sleep, &wait);
1342 set_current_state(TASK_INTERRUPTIBLE);
1343 spin_unlock_irq(&runtime->lock);
1344 timeout = schedule_timeout(30 * HZ);
1345 remove_wait_queue(&runtime->sleep, &wait);
0914f796
TI		 1346 if (rfile->rmidi->card->shutdown)
1347 return -ENODEV;
1da177e4
LT		 1348 if (signal_pending(current))
1349 return result > 0 ? result : -ERESTARTSYS;
1350 if (!runtime->avail && !timeout)
1351 return result > 0 ? result : -EIO;
1352 spin_lock_irq(&runtime->lock);
1353 }
1354 spin_unlock_irq(&runtime->lock);
17596a80 1355 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1da177e4
LT		 1356 if (count1 < 0)
1357 return result > 0 ? result : count1;
1358 result += count1;
1359 buf += count1;
1360 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1361 break;
1362 count -= count1;
1363 }
6b2f3d1f 1364 if (file->f_flags & O_DSYNC) {
1da177e4
LT		 1365 spin_lock_irq(&runtime->lock);
1366 while (runtime->avail != runtime->buffer_size) {
ac6424b9 1367 wait_queue_entry_t wait;
1da177e4 1368 unsigned int last_avail = runtime->avail;
5bed9139 1369
1da177e4
LT		 1370 init_waitqueue_entry(&wait, current);
1371 add_wait_queue(&runtime->sleep, &wait);
1372 set_current_state(TASK_INTERRUPTIBLE);
1373 spin_unlock_irq(&runtime->lock);
1374 timeout = schedule_timeout(30 * HZ);
1375 remove_wait_queue(&runtime->sleep, &wait);
1376 if (signal_pending(current))
1377 return result > 0 ? result : -ERESTARTSYS;
1378 if (runtime->avail == last_avail && !timeout)
1379 return result > 0 ? result : -EIO;
1380 spin_lock_irq(&runtime->lock);
1381 }
1382 spin_unlock_irq(&runtime->lock);
1383 }
1384 return result;
1385}
1386
5bed9139 1387static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1da177e4 1388{
48c9d417
TI		 1389 struct snd_rawmidi_file *rfile;
1390 struct snd_rawmidi_runtime *runtime;
680ef72a 1391 __poll_t mask;
1da177e4
LT		 1392
1393 rfile = file->private_data;
1394 if (rfile->input != NULL) {
1395 runtime = rfile->input->runtime;
1396 snd_rawmidi_input_trigger(rfile->input, 1);
1397 poll_wait(file, &runtime->sleep, wait);
1398 }
1399 if (rfile->output != NULL) {
1400 runtime = rfile->output->runtime;
1401 poll_wait(file, &runtime->sleep, wait);
1402 }
1403 mask = 0;
1404 if (rfile->input != NULL) {
1405 if (snd_rawmidi_ready(rfile->input))
a9a08845 1406 mask |= EPOLLIN | EPOLLRDNORM;
1da177e4
LT		 1407 }
1408 if (rfile->output != NULL) {
1409 if (snd_rawmidi_ready(rfile->output))
a9a08845 1410 mask |= EPOLLOUT | EPOLLWRNORM;
1da177e4
LT		 1411 }
1412 return mask;
1413}
1414
1415/*
1416 */
1417#ifdef CONFIG_COMPAT
1418#include "rawmidi_compat.c"
1419#else
1420#define snd_rawmidi_ioctl_compat NULL
1421#endif
1422
1423/*
1da177e4
LT		 1424 */
1425
48c9d417
TI		 1426static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1427 struct snd_info_buffer *buffer)
1da177e4 1428{
48c9d417
TI		 1429 struct snd_rawmidi *rmidi;
1430 struct snd_rawmidi_substream *substream;
1431 struct snd_rawmidi_runtime *runtime;
1da177e4
LT		 1432
1433 rmidi = entry->private_data;
1434 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1a60d4c5 1435 mutex_lock(&rmidi->open_mutex);
1da177e4 1436 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
9244b2c3
JB		 1437 list_for_each_entry(substream,
1438 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1439 list) {
1da177e4
LT		 1440 snd_iprintf(buffer,
1441 "Output %d\n"
1442 " Tx bytes : %lu\n",
1443 substream->number,
1444 (unsigned long) substream->bytes);
1445 if (substream->opened) {
7584af10
CL		 1446 snd_iprintf(buffer,
1447 " Owner PID : %d\n",
1448 pid_vnr(substream->pid));
1da177e4
LT		 1449 runtime = substream->runtime;
1450 snd_iprintf(buffer,
1451 " Mode : %s\n"
1452 " Buffer size : %lu\n"
1453 " Avail : %lu\n",
1454 runtime->oss ? "OSS compatible" : "native",
1455 (unsigned long) runtime->buffer_size,
1456 (unsigned long) runtime->avail);
1457 }
1458 }
1459 }
1460 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
9244b2c3
JB		 1461 list_for_each_entry(substream,
1462 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1463 list) {
1da177e4
LT		 1464 snd_iprintf(buffer,
1465 "Input %d\n"
1466 " Rx bytes : %lu\n",
1467 substream->number,
1468 (unsigned long) substream->bytes);
1469 if (substream->opened) {
7584af10
CL		 1470 snd_iprintf(buffer,
1471 " Owner PID : %d\n",
1472 pid_vnr(substream->pid));
1da177e4
LT		 1473 runtime = substream->runtime;
1474 snd_iprintf(buffer,
1475 " Buffer size : %lu\n"
1476 " Avail : %lu\n"
1477 " Overruns : %lu\n",
1478 (unsigned long) runtime->buffer_size,
1479 (unsigned long) runtime->avail,
1480 (unsigned long) runtime->xruns);
1481 }
1482 }
1483 }
1a60d4c5 1484 mutex_unlock(&rmidi->open_mutex);
1da177e4
LT		 1485}
1486
1487/*
1488 * Register functions
1489 */
1490
5bed9139 1491static const struct file_operations snd_rawmidi_f_ops = {
1da177e4
LT		 1492 .owner = THIS_MODULE,
1493 .read = snd_rawmidi_read,
1494 .write = snd_rawmidi_write,
1495 .open = snd_rawmidi_open,
1496 .release = snd_rawmidi_release,
02f4865f 1497 .llseek = no_llseek,
1da177e4
LT		 1498 .poll = snd_rawmidi_poll,
1499 .unlocked_ioctl = snd_rawmidi_ioctl,
1500 .compat_ioctl = snd_rawmidi_ioctl_compat,
1501};
1502
48c9d417
TI		 1503static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1504 struct snd_rawmidi_str *stream,
1da177e4
LT		 1505 int direction,
1506 int count)
1507{
48c9d417 1508 struct snd_rawmidi_substream *substream;
1da177e4
LT		 1509 int idx;
1510
1da177e4 1511 for (idx = 0; idx < count; idx++) {
ca2c0966 1512 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
ec0e9937 1513 if (!substream)
1da177e4
LT		 1514 return -ENOMEM;
1515 substream->stream = direction;
1516 substream->number = idx;
1517 substream->rmidi = rmidi;
1518 substream->pstr = stream;
1519 list_add_tail(&substream->list, &stream->substreams);
1520 stream->substream_count++;
1521 }
1522 return 0;
1523}
1524
aee5012f
TI		 1525static void release_rawmidi_device(struct device *dev)
1526{
1527 kfree(container_of(dev, struct snd_rawmidi, dev));
1528}
1529
1da177e4
LT		 1530/**
1531 * snd_rawmidi_new - create a rawmidi instance
1532 * @card: the card instance
1533 * @id: the id string
1534 * @device: the device index
1535 * @output_count: the number of output streams
1536 * @input_count: the number of input streams
1537 * @rrawmidi: the pointer to store the new rawmidi instance
1538 *
1539 * Creates a new rawmidi instance.
1540 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1541 *
eb7c06e8 1542 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1543 */
48c9d417 1544int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1da177e4 1545 int output_count, int input_count,
5bed9139 1546 struct snd_rawmidi **rrawmidi)
1da177e4 1547{
48c9d417 1548 struct snd_rawmidi *rmidi;
1da177e4 1549 int err;
48c9d417 1550 static struct snd_device_ops ops = {
1da177e4
LT		 1551 .dev_free = snd_rawmidi_dev_free,
1552 .dev_register = snd_rawmidi_dev_register,
1553 .dev_disconnect = snd_rawmidi_dev_disconnect,
1da177e4
LT		 1554 };
1555
7eaa943c
TI		 1556 if (snd_BUG_ON(!card))
1557 return -ENXIO;
1558 if (rrawmidi)
1559 *rrawmidi = NULL;
ca2c0966 1560 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
ec0e9937 1561 if (!rmidi)
1da177e4
LT		 1562 return -ENOMEM;
1563 rmidi->card = card;
1564 rmidi->device = device;
1a60d4c5 1565 mutex_init(&rmidi->open_mutex);
1da177e4 1566 init_waitqueue_head(&rmidi->open_wait);
c13893d7
AM		 1567 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1568 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1569
1da177e4
LT		 1570 if (id != NULL)
1571 strlcpy(rmidi->id, id, sizeof(rmidi->id));
aee5012f
TI		 1572
1573 snd_device_initialize(&rmidi->dev, card);
1574 rmidi->dev.release = release_rawmidi_device;
1575 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1576
5bed9139
TI		 1577 err = snd_rawmidi_alloc_substreams(rmidi,
1578 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1579 SNDRV_RAWMIDI_STREAM_INPUT,
1580 input_count);
7fdc9b08
TI		 1581 if (err < 0)
1582 goto error;
5bed9139
TI		 1583 err = snd_rawmidi_alloc_substreams(rmidi,
1584 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1585 SNDRV_RAWMIDI_STREAM_OUTPUT,
1586 output_count);
7fdc9b08
TI		 1587 if (err < 0)
1588 goto error;
5bed9139 1589 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
7fdc9b08
TI		 1590 if (err < 0)
1591 goto error;
1592
7eaa943c
TI		 1593 if (rrawmidi)
1594 *rrawmidi = rmidi;
1da177e4 1595 return 0;
7fdc9b08
TI		 1596
1597 error:
1598 snd_rawmidi_free(rmidi);
1599 return err;
1da177e4 1600}
6776a5d7 1601EXPORT_SYMBOL(snd_rawmidi_new);
1da177e4 1602
48c9d417 1603static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1da177e4 1604{
48c9d417 1605 struct snd_rawmidi_substream *substream;
1da177e4
LT		 1606
1607 while (!list_empty(&stream->substreams)) {
48c9d417 1608 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1da177e4
LT		 1609 list_del(&substream->list);
1610 kfree(substream);
1611 }
1612}
1613
48c9d417 1614static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1da177e4 1615{
7eaa943c
TI		 1616 if (!rmidi)
1617 return 0;
c461482c
TI		 1618
1619 snd_info_free_entry(rmidi->proc_entry);
1620 rmidi->proc_entry = NULL;
1621 mutex_lock(&register_mutex);
1622 if (rmidi->ops && rmidi->ops->dev_unregister)
1623 rmidi->ops->dev_unregister(rmidi);
1624 mutex_unlock(&register_mutex);
1625
1da177e4
LT		 1626 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1627 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1628 if (rmidi->private_free)
1629 rmidi->private_free(rmidi);
aee5012f 1630 put_device(&rmidi->dev);
1da177e4
LT		 1631 return 0;
1632}
1633
48c9d417 1634static int snd_rawmidi_dev_free(struct snd_device *device)
1da177e4 1635{
48c9d417 1636 struct snd_rawmidi *rmidi = device->device_data;
5bed9139 1637
1da177e4
LT		 1638 return snd_rawmidi_free(rmidi);
1639}
1640
111b0cdb 1641#if IS_ENABLED(CONFIG_SND_SEQUENCER)
48c9d417 1642static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1da177e4 1643{
48c9d417 1644 struct snd_rawmidi *rmidi = device->private_data;
5bed9139 1645
1da177e4
LT		 1646 rmidi->seq_dev = NULL;
1647}
1648#endif
1649
48c9d417 1650static int snd_rawmidi_dev_register(struct snd_device *device)
1da177e4 1651{
f87135f5 1652 int err;
48c9d417 1653 struct snd_info_entry *entry;
1da177e4 1654 char name[16];
48c9d417 1655 struct snd_rawmidi *rmidi = device->device_data;
1da177e4
LT		 1656
1657 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1658 return -ENOMEM;
7fdc9b08 1659 err = 0;
1a60d4c5 1660 mutex_lock(&register_mutex);
7fdc9b08
TI		 1661 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1662 err = -EBUSY;
1663 else
1664 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
816f318b 1665 mutex_unlock(&register_mutex);
7fdc9b08
TI		 1666 if (err < 0)
1667 return err;
1668
40a4b263
TI		 1669 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1670 rmidi->card, rmidi->device,
1671 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
aee5012f
TI		 1672 if (err < 0) {
1673 rmidi_err(rmidi, "unable to register\n");
7fdc9b08 1674 goto error;
1da177e4 1675 }
7fdc9b08
TI		 1676 if (rmidi->ops && rmidi->ops->dev_register) {
1677 err = rmidi->ops->dev_register(rmidi);
1678 if (err < 0)
1679 goto error_unregister;
1da177e4
LT		 1680 }
1681#ifdef CONFIG_SND_OSSEMUL
1682 rmidi->ossreg = 0;
1683 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1684 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
f87135f5 1685 rmidi->card, 0, &snd_rawmidi_f_ops,
80d7d771 1686 rmidi) < 0) {
ca20d292
TI		 1687 rmidi_err(rmidi,
1688 "unable to register OSS rawmidi device %i:%i\n",
1689 rmidi->card->number, 0);
1da177e4
LT		 1690 } else {
1691 rmidi->ossreg++;
1692#ifdef SNDRV_OSS_INFO_DEV_MIDI
1693 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1694#endif
1695 }
1696 }
1697 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1698 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
f87135f5 1699 rmidi->card, 1, &snd_rawmidi_f_ops,
80d7d771 1700 rmidi) < 0) {
ca20d292
TI		 1701 rmidi_err(rmidi,
1702 "unable to register OSS rawmidi device %i:%i\n",
1703 rmidi->card->number, 1);
1da177e4
LT		 1704 } else {
1705 rmidi->ossreg++;
1706 }
1707 }
1708#endif /* CONFIG_SND_OSSEMUL */
1da177e4
LT		 1709 sprintf(name, "midi%d", rmidi->device);
1710 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1711 if (entry) {
1712 entry->private_data = rmidi;
1da177e4
LT		 1713 entry->c.text.read = snd_rawmidi_proc_info_read;
1714 if (snd_info_register(entry) < 0) {
1715 snd_info_free_entry(entry);
1716 entry = NULL;
1717 }
1718 }
1719 rmidi->proc_entry = entry;
111b0cdb 1720#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1da177e4
LT		 1721 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1722 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1723 rmidi->seq_dev->private_data = rmidi;
1724 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1725 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1726 snd_device_register(rmidi->card, rmidi->seq_dev);
1727 }
1728 }
1729#endif
1730 return 0;
7fdc9b08
TI		 1731
1732 error_unregister:
1733 snd_unregister_device(&rmidi->dev);
1734 error:
1735 mutex_lock(&register_mutex);
1736 list_del(&rmidi->list);
1737 mutex_unlock(&register_mutex);
1738 return err;
1da177e4
LT		 1739}
1740
48c9d417 1741static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1da177e4 1742{
48c9d417 1743 struct snd_rawmidi *rmidi = device->device_data;
0914f796 1744 int dir;
1da177e4 1745
1a60d4c5 1746 mutex_lock(&register_mutex);
0914f796
TI		 1747 mutex_lock(&rmidi->open_mutex);
1748 wake_up(&rmidi->open_wait);
f87135f5 1749 list_del_init(&rmidi->list);
0914f796
TI		 1750 for (dir = 0; dir < 2; dir++) {
1751 struct snd_rawmidi_substream *s;
5bed9139 1752
0914f796
TI		 1753 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1754 if (s->runtime)
1755 wake_up(&s->runtime->sleep);
1756 }
1757 }
1758
1da177e4
LT		 1759#ifdef CONFIG_SND_OSSEMUL
1760 if (rmidi->ossreg) {
1761 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1762 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1763#ifdef SNDRV_OSS_INFO_DEV_MIDI
1764 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1765#endif
1766 }
1767 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1768 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1769 rmidi->ossreg = 0;
1770 }
1771#endif /* CONFIG_SND_OSSEMUL */
40a4b263 1772 snd_unregister_device(&rmidi->dev);
0914f796 1773 mutex_unlock(&rmidi->open_mutex);
1a60d4c5 1774 mutex_unlock(&register_mutex);
c461482c 1775 return 0;
1da177e4
LT		 1776}
1777
1778/**
1779 * snd_rawmidi_set_ops - set the rawmidi operators
1780 * @rmidi: the rawmidi instance
1781 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1782 * @ops: the operator table
1783 *
1784 * Sets the rawmidi operators for the given stream direction.
1785 */
48c9d417 1786void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
6ba79b85 1787 const struct snd_rawmidi_ops *ops)
1da177e4 1788{
48c9d417 1789 struct snd_rawmidi_substream *substream;
5bed9139 1790
9244b2c3 1791 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1da177e4 1792 substream->ops = ops;
1da177e4 1793}
6776a5d7 1794EXPORT_SYMBOL(snd_rawmidi_set_ops);
1da177e4
LT		 1795
1796/*
1797 * ENTRY functions
1798 */
1799
1800static int __init alsa_rawmidi_init(void)
1801{
1802
1803 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1804 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1805#ifdef CONFIG_SND_OSSEMUL
1806 { int i;
1807 /* check device map table */
1808 for (i = 0; i < SNDRV_CARDS; i++) {
1809 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
ca20d292
TI		 1810 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1811 i, midi_map[i]);
1da177e4
LT		 1812 midi_map[i] = 0;
1813 }
1814 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
ca20d292
TI		 1815 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1816 i, amidi_map[i]);
1da177e4
LT		 1817 amidi_map[i] = 1;
1818 }
1819 }
1820 }
1821#endif /* CONFIG_SND_OSSEMUL */
1822 return 0;
1823}
1824
1825static void __exit alsa_rawmidi_exit(void)
1826{
1827 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1828 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1829}
1830
1831module_init(alsa_rawmidi_init)
1832module_exit(alsa_rawmidi_exit)
Linux 6.x block layer and io_uring tree(s)