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[thirdparty/linux.git] / sound / core / rawmidi.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Abstract layer for MIDI v1.0 stream
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7 #include <sound/core.h>
8 #include <linux/major.h>
9 #include <linux/init.h>
10 #include <linux/sched/signal.h>
11 #include <linux/slab.h>
12 #include <linux/time.h>
13 #include <linux/wait.h>
14 #include <linux/mutex.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/mm.h>
18 #include <linux/nospec.h>
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
25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
26 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
27 MODULE_LICENSE("GPL");
28
29 #ifdef CONFIG_SND_OSSEMUL
30 static int midi_map[SNDRV_CARDS];
31 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
32 module_param_array(midi_map, int, NULL, 0444);
33 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
34 module_param_array(amidi_map, int, NULL, 0444);
35 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
36 #endif /* CONFIG_SND_OSSEMUL */
37
38 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
39 static int snd_rawmidi_dev_free(struct snd_device *device);
40 static int snd_rawmidi_dev_register(struct snd_device *device);
41 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
42
43 static LIST_HEAD(snd_rawmidi_devices);
44 static DEFINE_MUTEX(register_mutex);
45
46 #define rmidi_err(rmidi, fmt, args...) \
47 dev_err(&(rmidi)->dev, fmt, ##args)
48 #define rmidi_warn(rmidi, fmt, args...) \
49 dev_warn(&(rmidi)->dev, fmt, ##args)
50 #define rmidi_dbg(rmidi, fmt, args...) \
51 dev_dbg(&(rmidi)->dev, fmt, ##args)
52
53 struct snd_rawmidi_status32 {
54 s32 stream;
55 s32 tstamp_sec; /* Timestamp */
56 s32 tstamp_nsec;
57 u32 avail; /* available bytes */
58 u32 xruns; /* count of overruns since last status (in bytes) */
59 unsigned char reserved[16]; /* reserved for future use */
60 };
61
62 #define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32)
63
64 struct snd_rawmidi_status64 {
65 int stream;
66 u8 rsvd[4]; /* alignment */
67 s64 tstamp_sec; /* Timestamp */
68 s64 tstamp_nsec;
69 size_t avail; /* available bytes */
70 size_t xruns; /* count of overruns since last status (in bytes) */
71 unsigned char reserved[16]; /* reserved for future use */
72 };
73
74 #define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64)
75
76 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
77 {
78 struct snd_rawmidi *rawmidi;
79
80 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
81 if (rawmidi->card == card && rawmidi->device == device)
82 return rawmidi;
83 return NULL;
84 }
85
86 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
87 {
88 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
89 case FMODE_WRITE:
90 return SNDRV_RAWMIDI_LFLG_OUTPUT;
91 case FMODE_READ:
92 return SNDRV_RAWMIDI_LFLG_INPUT;
93 default:
94 return SNDRV_RAWMIDI_LFLG_OPEN;
95 }
96 }
97
98 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
99 {
100 struct snd_rawmidi_runtime *runtime = substream->runtime;
101
102 return runtime->avail >= runtime->avail_min;
103 }
104
105 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
106 size_t count)
107 {
108 struct snd_rawmidi_runtime *runtime = substream->runtime;
109
110 return runtime->avail >= runtime->avail_min &&
111 (!substream->append || runtime->avail >= count);
112 }
113
114 static void snd_rawmidi_input_event_work(struct work_struct *work)
115 {
116 struct snd_rawmidi_runtime *runtime =
117 container_of(work, struct snd_rawmidi_runtime, event_work);
118
119 if (runtime->event)
120 runtime->event(runtime->substream);
121 }
122
123 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
124 {
125 struct snd_rawmidi_runtime *runtime;
126
127 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
128 if (!runtime)
129 return -ENOMEM;
130 runtime->substream = substream;
131 spin_lock_init(&runtime->lock);
132 init_waitqueue_head(&runtime->sleep);
133 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
134 runtime->event = NULL;
135 runtime->buffer_size = PAGE_SIZE;
136 runtime->avail_min = 1;
137 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
138 runtime->avail = 0;
139 else
140 runtime->avail = runtime->buffer_size;
141 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
142 if (!runtime->buffer) {
143 kfree(runtime);
144 return -ENOMEM;
145 }
146 runtime->appl_ptr = runtime->hw_ptr = 0;
147 substream->runtime = runtime;
148 return 0;
149 }
150
151 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
152 {
153 struct snd_rawmidi_runtime *runtime = substream->runtime;
154
155 kvfree(runtime->buffer);
156 kfree(runtime);
157 substream->runtime = NULL;
158 return 0;
159 }
160
161 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
162 {
163 if (!substream->opened)
164 return;
165 substream->ops->trigger(substream, up);
166 }
167
168 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
169 {
170 if (!substream->opened)
171 return;
172 substream->ops->trigger(substream, up);
173 if (!up)
174 cancel_work_sync(&substream->runtime->event_work);
175 }
176
177 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
178 bool is_input)
179 {
180 runtime->drain = 0;
181 runtime->appl_ptr = runtime->hw_ptr = 0;
182 runtime->avail = is_input ? 0 : runtime->buffer_size;
183 }
184
185 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
186 bool is_input)
187 {
188 unsigned long flags;
189
190 spin_lock_irqsave(&runtime->lock, flags);
191 __reset_runtime_ptrs(runtime, is_input);
192 spin_unlock_irqrestore(&runtime->lock, flags);
193 }
194
195 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
196 {
197 snd_rawmidi_output_trigger(substream, 0);
198 reset_runtime_ptrs(substream->runtime, false);
199 return 0;
200 }
201 EXPORT_SYMBOL(snd_rawmidi_drop_output);
202
203 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
204 {
205 int err;
206 long timeout;
207 struct snd_rawmidi_runtime *runtime = substream->runtime;
208
209 err = 0;
210 runtime->drain = 1;
211 timeout = wait_event_interruptible_timeout(runtime->sleep,
212 (runtime->avail >= runtime->buffer_size),
213 10*HZ);
214 if (signal_pending(current))
215 err = -ERESTARTSYS;
216 if (runtime->avail < runtime->buffer_size && !timeout) {
217 rmidi_warn(substream->rmidi,
218 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
219 (long)runtime->avail, (long)runtime->buffer_size);
220 err = -EIO;
221 }
222 runtime->drain = 0;
223 if (err != -ERESTARTSYS) {
224 /* we need wait a while to make sure that Tx FIFOs are empty */
225 if (substream->ops->drain)
226 substream->ops->drain(substream);
227 else
228 msleep(50);
229 snd_rawmidi_drop_output(substream);
230 }
231 return err;
232 }
233 EXPORT_SYMBOL(snd_rawmidi_drain_output);
234
235 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
236 {
237 snd_rawmidi_input_trigger(substream, 0);
238 reset_runtime_ptrs(substream->runtime, true);
239 return 0;
240 }
241 EXPORT_SYMBOL(snd_rawmidi_drain_input);
242
243 /* look for an available substream for the given stream direction;
244 * if a specific subdevice is given, try to assign it
245 */
246 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
247 int stream, int mode,
248 struct snd_rawmidi_substream **sub_ret)
249 {
250 struct snd_rawmidi_substream *substream;
251 struct snd_rawmidi_str *s = &rmidi->streams[stream];
252 static const unsigned int info_flags[2] = {
253 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
254 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
255 };
256
257 if (!(rmidi->info_flags & info_flags[stream]))
258 return -ENXIO;
259 if (subdevice >= 0 && subdevice >= s->substream_count)
260 return -ENODEV;
261
262 list_for_each_entry(substream, &s->substreams, list) {
263 if (substream->opened) {
264 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
265 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
266 !substream->append)
267 continue;
268 }
269 if (subdevice < 0 || subdevice == substream->number) {
270 *sub_ret = substream;
271 return 0;
272 }
273 }
274 return -EAGAIN;
275 }
276
277 /* open and do ref-counting for the given substream */
278 static int open_substream(struct snd_rawmidi *rmidi,
279 struct snd_rawmidi_substream *substream,
280 int mode)
281 {
282 int err;
283
284 if (substream->use_count == 0) {
285 err = snd_rawmidi_runtime_create(substream);
286 if (err < 0)
287 return err;
288 err = substream->ops->open(substream);
289 if (err < 0) {
290 snd_rawmidi_runtime_free(substream);
291 return err;
292 }
293 substream->opened = 1;
294 substream->active_sensing = 0;
295 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
296 substream->append = 1;
297 substream->pid = get_pid(task_pid(current));
298 rmidi->streams[substream->stream].substream_opened++;
299 }
300 substream->use_count++;
301 return 0;
302 }
303
304 static void close_substream(struct snd_rawmidi *rmidi,
305 struct snd_rawmidi_substream *substream,
306 int cleanup);
307
308 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
309 struct snd_rawmidi_file *rfile)
310 {
311 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
312 int err;
313
314 rfile->input = rfile->output = NULL;
315 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
316 err = assign_substream(rmidi, subdevice,
317 SNDRV_RAWMIDI_STREAM_INPUT,
318 mode, &sinput);
319 if (err < 0)
320 return err;
321 }
322 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
323 err = assign_substream(rmidi, subdevice,
324 SNDRV_RAWMIDI_STREAM_OUTPUT,
325 mode, &soutput);
326 if (err < 0)
327 return err;
328 }
329
330 if (sinput) {
331 err = open_substream(rmidi, sinput, mode);
332 if (err < 0)
333 return err;
334 }
335 if (soutput) {
336 err = open_substream(rmidi, soutput, mode);
337 if (err < 0) {
338 if (sinput)
339 close_substream(rmidi, sinput, 0);
340 return err;
341 }
342 }
343
344 rfile->rmidi = rmidi;
345 rfile->input = sinput;
346 rfile->output = soutput;
347 return 0;
348 }
349
350 /* called from sound/core/seq/seq_midi.c */
351 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
352 int mode, struct snd_rawmidi_file *rfile)
353 {
354 struct snd_rawmidi *rmidi;
355 int err = 0;
356
357 if (snd_BUG_ON(!rfile))
358 return -EINVAL;
359
360 mutex_lock(&register_mutex);
361 rmidi = snd_rawmidi_search(card, device);
362 if (!rmidi)
363 err = -ENODEV;
364 else if (!try_module_get(rmidi->card->module))
365 err = -ENXIO;
366 mutex_unlock(&register_mutex);
367 if (err < 0)
368 return err;
369
370 mutex_lock(&rmidi->open_mutex);
371 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
372 mutex_unlock(&rmidi->open_mutex);
373 if (err < 0)
374 module_put(rmidi->card->module);
375 return err;
376 }
377 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
378
379 static int snd_rawmidi_open(struct inode *inode, struct file *file)
380 {
381 int maj = imajor(inode);
382 struct snd_card *card;
383 int subdevice;
384 unsigned short fflags;
385 int err;
386 struct snd_rawmidi *rmidi;
387 struct snd_rawmidi_file *rawmidi_file = NULL;
388 wait_queue_entry_t wait;
389
390 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
391 return -EINVAL; /* invalid combination */
392
393 err = stream_open(inode, file);
394 if (err < 0)
395 return err;
396
397 if (maj == snd_major) {
398 rmidi = snd_lookup_minor_data(iminor(inode),
399 SNDRV_DEVICE_TYPE_RAWMIDI);
400 #ifdef CONFIG_SND_OSSEMUL
401 } else if (maj == SOUND_MAJOR) {
402 rmidi = snd_lookup_oss_minor_data(iminor(inode),
403 SNDRV_OSS_DEVICE_TYPE_MIDI);
404 #endif
405 } else
406 return -ENXIO;
407
408 if (rmidi == NULL)
409 return -ENODEV;
410
411 if (!try_module_get(rmidi->card->module)) {
412 snd_card_unref(rmidi->card);
413 return -ENXIO;
414 }
415
416 mutex_lock(&rmidi->open_mutex);
417 card = rmidi->card;
418 err = snd_card_file_add(card, file);
419 if (err < 0)
420 goto __error_card;
421 fflags = snd_rawmidi_file_flags(file);
422 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
423 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
424 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
425 if (rawmidi_file == NULL) {
426 err = -ENOMEM;
427 goto __error;
428 }
429 init_waitqueue_entry(&wait, current);
430 add_wait_queue(&rmidi->open_wait, &wait);
431 while (1) {
432 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
433 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
434 if (err >= 0)
435 break;
436 if (err == -EAGAIN) {
437 if (file->f_flags & O_NONBLOCK) {
438 err = -EBUSY;
439 break;
440 }
441 } else
442 break;
443 set_current_state(TASK_INTERRUPTIBLE);
444 mutex_unlock(&rmidi->open_mutex);
445 schedule();
446 mutex_lock(&rmidi->open_mutex);
447 if (rmidi->card->shutdown) {
448 err = -ENODEV;
449 break;
450 }
451 if (signal_pending(current)) {
452 err = -ERESTARTSYS;
453 break;
454 }
455 }
456 remove_wait_queue(&rmidi->open_wait, &wait);
457 if (err < 0) {
458 kfree(rawmidi_file);
459 goto __error;
460 }
461 #ifdef CONFIG_SND_OSSEMUL
462 if (rawmidi_file->input && rawmidi_file->input->runtime)
463 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
464 if (rawmidi_file->output && rawmidi_file->output->runtime)
465 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
466 #endif
467 file->private_data = rawmidi_file;
468 mutex_unlock(&rmidi->open_mutex);
469 snd_card_unref(rmidi->card);
470 return 0;
471
472 __error:
473 snd_card_file_remove(card, file);
474 __error_card:
475 mutex_unlock(&rmidi->open_mutex);
476 module_put(rmidi->card->module);
477 snd_card_unref(rmidi->card);
478 return err;
479 }
480
481 static void close_substream(struct snd_rawmidi *rmidi,
482 struct snd_rawmidi_substream *substream,
483 int cleanup)
484 {
485 if (--substream->use_count)
486 return;
487
488 if (cleanup) {
489 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
490 snd_rawmidi_input_trigger(substream, 0);
491 else {
492 if (substream->active_sensing) {
493 unsigned char buf = 0xfe;
494 /* sending single active sensing message
495 * to shut the device up
496 */
497 snd_rawmidi_kernel_write(substream, &buf, 1);
498 }
499 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
500 snd_rawmidi_output_trigger(substream, 0);
501 }
502 }
503 substream->ops->close(substream);
504 if (substream->runtime->private_free)
505 substream->runtime->private_free(substream);
506 snd_rawmidi_runtime_free(substream);
507 substream->opened = 0;
508 substream->append = 0;
509 put_pid(substream->pid);
510 substream->pid = NULL;
511 rmidi->streams[substream->stream].substream_opened--;
512 }
513
514 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
515 {
516 struct snd_rawmidi *rmidi;
517
518 rmidi = rfile->rmidi;
519 mutex_lock(&rmidi->open_mutex);
520 if (rfile->input) {
521 close_substream(rmidi, rfile->input, 1);
522 rfile->input = NULL;
523 }
524 if (rfile->output) {
525 close_substream(rmidi, rfile->output, 1);
526 rfile->output = NULL;
527 }
528 rfile->rmidi = NULL;
529 mutex_unlock(&rmidi->open_mutex);
530 wake_up(&rmidi->open_wait);
531 }
532
533 /* called from sound/core/seq/seq_midi.c */
534 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
535 {
536 struct snd_rawmidi *rmidi;
537
538 if (snd_BUG_ON(!rfile))
539 return -ENXIO;
540
541 rmidi = rfile->rmidi;
542 rawmidi_release_priv(rfile);
543 module_put(rmidi->card->module);
544 return 0;
545 }
546 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
547
548 static int snd_rawmidi_release(struct inode *inode, struct file *file)
549 {
550 struct snd_rawmidi_file *rfile;
551 struct snd_rawmidi *rmidi;
552 struct module *module;
553
554 rfile = file->private_data;
555 rmidi = rfile->rmidi;
556 rawmidi_release_priv(rfile);
557 kfree(rfile);
558 module = rmidi->card->module;
559 snd_card_file_remove(rmidi->card, file);
560 module_put(module);
561 return 0;
562 }
563
564 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
565 struct snd_rawmidi_info *info)
566 {
567 struct snd_rawmidi *rmidi;
568
569 if (substream == NULL)
570 return -ENODEV;
571 rmidi = substream->rmidi;
572 memset(info, 0, sizeof(*info));
573 info->card = rmidi->card->number;
574 info->device = rmidi->device;
575 info->subdevice = substream->number;
576 info->stream = substream->stream;
577 info->flags = rmidi->info_flags;
578 strcpy(info->id, rmidi->id);
579 strcpy(info->name, rmidi->name);
580 strcpy(info->subname, substream->name);
581 info->subdevices_count = substream->pstr->substream_count;
582 info->subdevices_avail = (substream->pstr->substream_count -
583 substream->pstr->substream_opened);
584 return 0;
585 }
586
587 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
588 struct snd_rawmidi_info __user *_info)
589 {
590 struct snd_rawmidi_info info;
591 int err;
592
593 err = snd_rawmidi_info(substream, &info);
594 if (err < 0)
595 return err;
596 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
597 return -EFAULT;
598 return 0;
599 }
600
601 static int __snd_rawmidi_info_select(struct snd_card *card,
602 struct snd_rawmidi_info *info)
603 {
604 struct snd_rawmidi *rmidi;
605 struct snd_rawmidi_str *pstr;
606 struct snd_rawmidi_substream *substream;
607
608 rmidi = snd_rawmidi_search(card, info->device);
609 if (!rmidi)
610 return -ENXIO;
611 if (info->stream < 0 || info->stream > 1)
612 return -EINVAL;
613 info->stream = array_index_nospec(info->stream, 2);
614 pstr = &rmidi->streams[info->stream];
615 if (pstr->substream_count == 0)
616 return -ENOENT;
617 if (info->subdevice >= pstr->substream_count)
618 return -ENXIO;
619 list_for_each_entry(substream, &pstr->substreams, list) {
620 if ((unsigned int)substream->number == info->subdevice)
621 return snd_rawmidi_info(substream, info);
622 }
623 return -ENXIO;
624 }
625
626 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
627 {
628 int ret;
629
630 mutex_lock(&register_mutex);
631 ret = __snd_rawmidi_info_select(card, info);
632 mutex_unlock(&register_mutex);
633 return ret;
634 }
635 EXPORT_SYMBOL(snd_rawmidi_info_select);
636
637 static int snd_rawmidi_info_select_user(struct snd_card *card,
638 struct snd_rawmidi_info __user *_info)
639 {
640 int err;
641 struct snd_rawmidi_info info;
642
643 if (get_user(info.device, &_info->device))
644 return -EFAULT;
645 if (get_user(info.stream, &_info->stream))
646 return -EFAULT;
647 if (get_user(info.subdevice, &_info->subdevice))
648 return -EFAULT;
649 err = snd_rawmidi_info_select(card, &info);
650 if (err < 0)
651 return err;
652 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
653 return -EFAULT;
654 return 0;
655 }
656
657 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
658 struct snd_rawmidi_params *params,
659 bool is_input)
660 {
661 char *newbuf, *oldbuf;
662
663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
664 return -EINVAL;
665 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
666 return -EINVAL;
667 if (params->buffer_size != runtime->buffer_size) {
668 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
669 if (!newbuf)
670 return -ENOMEM;
671 spin_lock_irq(&runtime->lock);
672 oldbuf = runtime->buffer;
673 runtime->buffer = newbuf;
674 runtime->buffer_size = params->buffer_size;
675 __reset_runtime_ptrs(runtime, is_input);
676 spin_unlock_irq(&runtime->lock);
677 kvfree(oldbuf);
678 }
679 runtime->avail_min = params->avail_min;
680 return 0;
681 }
682
683 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
684 struct snd_rawmidi_params *params)
685 {
686 if (substream->append && substream->use_count > 1)
687 return -EBUSY;
688 snd_rawmidi_drain_output(substream);
689 substream->active_sensing = !params->no_active_sensing;
690 return resize_runtime_buffer(substream->runtime, params, false);
691 }
692 EXPORT_SYMBOL(snd_rawmidi_output_params);
693
694 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
695 struct snd_rawmidi_params *params)
696 {
697 snd_rawmidi_drain_input(substream);
698 return resize_runtime_buffer(substream->runtime, params, true);
699 }
700 EXPORT_SYMBOL(snd_rawmidi_input_params);
701
702 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
703 struct snd_rawmidi_status64 *status)
704 {
705 struct snd_rawmidi_runtime *runtime = substream->runtime;
706
707 memset(status, 0, sizeof(*status));
708 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
709 spin_lock_irq(&runtime->lock);
710 status->avail = runtime->avail;
711 spin_unlock_irq(&runtime->lock);
712 return 0;
713 }
714
715 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
716 struct snd_rawmidi_status64 *status)
717 {
718 struct snd_rawmidi_runtime *runtime = substream->runtime;
719
720 memset(status, 0, sizeof(*status));
721 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
722 spin_lock_irq(&runtime->lock);
723 status->avail = runtime->avail;
724 status->xruns = runtime->xruns;
725 runtime->xruns = 0;
726 spin_unlock_irq(&runtime->lock);
727 return 0;
728 }
729
730 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
731 struct snd_rawmidi_status32 __user *argp)
732 {
733 int err = 0;
734 struct snd_rawmidi_status32 __user *status = argp;
735 struct snd_rawmidi_status32 status32;
736 struct snd_rawmidi_status64 status64;
737
738 if (copy_from_user(&status32, argp,
739 sizeof(struct snd_rawmidi_status32)))
740 return -EFAULT;
741
742 switch (status32.stream) {
743 case SNDRV_RAWMIDI_STREAM_OUTPUT:
744 if (rfile->output == NULL)
745 return -EINVAL;
746 err = snd_rawmidi_output_status(rfile->output, &status64);
747 break;
748 case SNDRV_RAWMIDI_STREAM_INPUT:
749 if (rfile->input == NULL)
750 return -EINVAL;
751 err = snd_rawmidi_input_status(rfile->input, &status64);
752 break;
753 default:
754 return -EINVAL;
755 }
756 if (err < 0)
757 return err;
758
759 status32 = (struct snd_rawmidi_status32) {
760 .stream = status64.stream,
761 .tstamp_sec = status64.tstamp_sec,
762 .tstamp_nsec = status64.tstamp_nsec,
763 .avail = status64.avail,
764 .xruns = status64.xruns,
765 };
766
767 if (copy_to_user(status, &status32, sizeof(*status)))
768 return -EFAULT;
769
770 return 0;
771 }
772
773 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
774 struct snd_rawmidi_status64 __user *argp)
775 {
776 int err = 0;
777 struct snd_rawmidi_status64 status;
778
779 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
780 return -EFAULT;
781
782 switch (status.stream) {
783 case SNDRV_RAWMIDI_STREAM_OUTPUT:
784 if (rfile->output == NULL)
785 return -EINVAL;
786 err = snd_rawmidi_output_status(rfile->output, &status);
787 break;
788 case SNDRV_RAWMIDI_STREAM_INPUT:
789 if (rfile->input == NULL)
790 return -EINVAL;
791 err = snd_rawmidi_input_status(rfile->input, &status);
792 break;
793 default:
794 return -EINVAL;
795 }
796 if (err < 0)
797 return err;
798 if (copy_to_user(argp, &status,
799 sizeof(struct snd_rawmidi_status64)))
800 return -EFAULT;
801 return 0;
802 }
803
804 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
805 {
806 struct snd_rawmidi_file *rfile;
807 void __user *argp = (void __user *)arg;
808
809 rfile = file->private_data;
810 if (((cmd >> 8) & 0xff) != 'W')
811 return -ENOTTY;
812 switch (cmd) {
813 case SNDRV_RAWMIDI_IOCTL_PVERSION:
814 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
815 case SNDRV_RAWMIDI_IOCTL_INFO:
816 {
817 int stream;
818 struct snd_rawmidi_info __user *info = argp;
819
820 if (get_user(stream, &info->stream))
821 return -EFAULT;
822 switch (stream) {
823 case SNDRV_RAWMIDI_STREAM_INPUT:
824 return snd_rawmidi_info_user(rfile->input, info);
825 case SNDRV_RAWMIDI_STREAM_OUTPUT:
826 return snd_rawmidi_info_user(rfile->output, info);
827 default:
828 return -EINVAL;
829 }
830 }
831 case SNDRV_RAWMIDI_IOCTL_PARAMS:
832 {
833 struct snd_rawmidi_params params;
834
835 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
836 return -EFAULT;
837 switch (params.stream) {
838 case SNDRV_RAWMIDI_STREAM_OUTPUT:
839 if (rfile->output == NULL)
840 return -EINVAL;
841 return snd_rawmidi_output_params(rfile->output, &params);
842 case SNDRV_RAWMIDI_STREAM_INPUT:
843 if (rfile->input == NULL)
844 return -EINVAL;
845 return snd_rawmidi_input_params(rfile->input, &params);
846 default:
847 return -EINVAL;
848 }
849 }
850 case SNDRV_RAWMIDI_IOCTL_STATUS32:
851 return snd_rawmidi_ioctl_status32(rfile, argp);
852 case SNDRV_RAWMIDI_IOCTL_STATUS64:
853 return snd_rawmidi_ioctl_status64(rfile, argp);
854 case SNDRV_RAWMIDI_IOCTL_DROP:
855 {
856 int val;
857
858 if (get_user(val, (int __user *) argp))
859 return -EFAULT;
860 switch (val) {
861 case SNDRV_RAWMIDI_STREAM_OUTPUT:
862 if (rfile->output == NULL)
863 return -EINVAL;
864 return snd_rawmidi_drop_output(rfile->output);
865 default:
866 return -EINVAL;
867 }
868 }
869 case SNDRV_RAWMIDI_IOCTL_DRAIN:
870 {
871 int val;
872
873 if (get_user(val, (int __user *) argp))
874 return -EFAULT;
875 switch (val) {
876 case SNDRV_RAWMIDI_STREAM_OUTPUT:
877 if (rfile->output == NULL)
878 return -EINVAL;
879 return snd_rawmidi_drain_output(rfile->output);
880 case SNDRV_RAWMIDI_STREAM_INPUT:
881 if (rfile->input == NULL)
882 return -EINVAL;
883 return snd_rawmidi_drain_input(rfile->input);
884 default:
885 return -EINVAL;
886 }
887 }
888 default:
889 rmidi_dbg(rfile->rmidi,
890 "rawmidi: unknown command = 0x%x\n", cmd);
891 }
892 return -ENOTTY;
893 }
894
895 static int snd_rawmidi_control_ioctl(struct snd_card *card,
896 struct snd_ctl_file *control,
897 unsigned int cmd,
898 unsigned long arg)
899 {
900 void __user *argp = (void __user *)arg;
901
902 switch (cmd) {
903 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
904 {
905 int device;
906
907 if (get_user(device, (int __user *)argp))
908 return -EFAULT;
909 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
910 device = SNDRV_RAWMIDI_DEVICES - 1;
911 mutex_lock(&register_mutex);
912 device = device < 0 ? 0 : device + 1;
913 while (device < SNDRV_RAWMIDI_DEVICES) {
914 if (snd_rawmidi_search(card, device))
915 break;
916 device++;
917 }
918 if (device == SNDRV_RAWMIDI_DEVICES)
919 device = -1;
920 mutex_unlock(&register_mutex);
921 if (put_user(device, (int __user *)argp))
922 return -EFAULT;
923 return 0;
924 }
925 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
926 {
927 int val;
928
929 if (get_user(val, (int __user *)argp))
930 return -EFAULT;
931 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
932 return 0;
933 }
934 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
935 return snd_rawmidi_info_select_user(card, argp);
936 }
937 return -ENOIOCTLCMD;
938 }
939
940 /**
941 * snd_rawmidi_receive - receive the input data from the device
942 * @substream: the rawmidi substream
943 * @buffer: the buffer pointer
944 * @count: the data size to read
945 *
946 * Reads the data from the internal buffer.
947 *
948 * Return: The size of read data, or a negative error code on failure.
949 */
950 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
951 const unsigned char *buffer, int count)
952 {
953 unsigned long flags;
954 int result = 0, count1;
955 struct snd_rawmidi_runtime *runtime = substream->runtime;
956
957 if (!substream->opened)
958 return -EBADFD;
959 if (runtime->buffer == NULL) {
960 rmidi_dbg(substream->rmidi,
961 "snd_rawmidi_receive: input is not active!!!\n");
962 return -EINVAL;
963 }
964 spin_lock_irqsave(&runtime->lock, flags);
965 if (count == 1) { /* special case, faster code */
966 substream->bytes++;
967 if (runtime->avail < runtime->buffer_size) {
968 runtime->buffer[runtime->hw_ptr++] = buffer[0];
969 runtime->hw_ptr %= runtime->buffer_size;
970 runtime->avail++;
971 result++;
972 } else {
973 runtime->xruns++;
974 }
975 } else {
976 substream->bytes += count;
977 count1 = runtime->buffer_size - runtime->hw_ptr;
978 if (count1 > count)
979 count1 = count;
980 if (count1 > (int)(runtime->buffer_size - runtime->avail))
981 count1 = runtime->buffer_size - runtime->avail;
982 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
983 runtime->hw_ptr += count1;
984 runtime->hw_ptr %= runtime->buffer_size;
985 runtime->avail += count1;
986 count -= count1;
987 result += count1;
988 if (count > 0) {
989 buffer += count1;
990 count1 = count;
991 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
992 count1 = runtime->buffer_size - runtime->avail;
993 runtime->xruns += count - count1;
994 }
995 if (count1 > 0) {
996 memcpy(runtime->buffer, buffer, count1);
997 runtime->hw_ptr = count1;
998 runtime->avail += count1;
999 result += count1;
1000 }
1001 }
1002 }
1003 if (result > 0) {
1004 if (runtime->event)
1005 schedule_work(&runtime->event_work);
1006 else if (snd_rawmidi_ready(substream))
1007 wake_up(&runtime->sleep);
1008 }
1009 spin_unlock_irqrestore(&runtime->lock, flags);
1010 return result;
1011 }
1012 EXPORT_SYMBOL(snd_rawmidi_receive);
1013
1014 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1015 unsigned char __user *userbuf,
1016 unsigned char *kernelbuf, long count)
1017 {
1018 unsigned long flags;
1019 long result = 0, count1;
1020 struct snd_rawmidi_runtime *runtime = substream->runtime;
1021 unsigned long appl_ptr;
1022
1023 spin_lock_irqsave(&runtime->lock, flags);
1024 while (count > 0 && runtime->avail) {
1025 count1 = runtime->buffer_size - runtime->appl_ptr;
1026 if (count1 > count)
1027 count1 = count;
1028 if (count1 > (int)runtime->avail)
1029 count1 = runtime->avail;
1030
1031 /* update runtime->appl_ptr before unlocking for userbuf */
1032 appl_ptr = runtime->appl_ptr;
1033 runtime->appl_ptr += count1;
1034 runtime->appl_ptr %= runtime->buffer_size;
1035 runtime->avail -= count1;
1036
1037 if (kernelbuf)
1038 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1039 if (userbuf) {
1040 spin_unlock_irqrestore(&runtime->lock, flags);
1041 if (copy_to_user(userbuf + result,
1042 runtime->buffer + appl_ptr, count1)) {
1043 return result > 0 ? result : -EFAULT;
1044 }
1045 spin_lock_irqsave(&runtime->lock, flags);
1046 }
1047 result += count1;
1048 count -= count1;
1049 }
1050 spin_unlock_irqrestore(&runtime->lock, flags);
1051 return result;
1052 }
1053
1054 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1055 unsigned char *buf, long count)
1056 {
1057 snd_rawmidi_input_trigger(substream, 1);
1058 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1059 }
1060 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1061
1062 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1063 loff_t *offset)
1064 {
1065 long result;
1066 int count1;
1067 struct snd_rawmidi_file *rfile;
1068 struct snd_rawmidi_substream *substream;
1069 struct snd_rawmidi_runtime *runtime;
1070
1071 rfile = file->private_data;
1072 substream = rfile->input;
1073 if (substream == NULL)
1074 return -EIO;
1075 runtime = substream->runtime;
1076 snd_rawmidi_input_trigger(substream, 1);
1077 result = 0;
1078 while (count > 0) {
1079 spin_lock_irq(&runtime->lock);
1080 while (!snd_rawmidi_ready(substream)) {
1081 wait_queue_entry_t wait;
1082
1083 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1084 spin_unlock_irq(&runtime->lock);
1085 return result > 0 ? result : -EAGAIN;
1086 }
1087 init_waitqueue_entry(&wait, current);
1088 add_wait_queue(&runtime->sleep, &wait);
1089 set_current_state(TASK_INTERRUPTIBLE);
1090 spin_unlock_irq(&runtime->lock);
1091 schedule();
1092 remove_wait_queue(&runtime->sleep, &wait);
1093 if (rfile->rmidi->card->shutdown)
1094 return -ENODEV;
1095 if (signal_pending(current))
1096 return result > 0 ? result : -ERESTARTSYS;
1097 if (!runtime->avail)
1098 return result > 0 ? result : -EIO;
1099 spin_lock_irq(&runtime->lock);
1100 }
1101 spin_unlock_irq(&runtime->lock);
1102 count1 = snd_rawmidi_kernel_read1(substream,
1103 (unsigned char __user *)buf,
1104 NULL/*kernelbuf*/,
1105 count);
1106 if (count1 < 0)
1107 return result > 0 ? result : count1;
1108 result += count1;
1109 buf += count1;
1110 count -= count1;
1111 }
1112 return result;
1113 }
1114
1115 /**
1116 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1117 * @substream: the rawmidi substream
1118 *
1119 * Return: 1 if the internal output buffer is empty, 0 if not.
1120 */
1121 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1122 {
1123 struct snd_rawmidi_runtime *runtime = substream->runtime;
1124 int result;
1125 unsigned long flags;
1126
1127 if (runtime->buffer == NULL) {
1128 rmidi_dbg(substream->rmidi,
1129 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1130 return 1;
1131 }
1132 spin_lock_irqsave(&runtime->lock, flags);
1133 result = runtime->avail >= runtime->buffer_size;
1134 spin_unlock_irqrestore(&runtime->lock, flags);
1135 return result;
1136 }
1137 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1138
1139 /**
1140 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1141 * @substream: the rawmidi substream
1142 * @buffer: the buffer pointer
1143 * @count: data size to transfer
1144 *
1145 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1146 */
1147 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1148 unsigned char *buffer, int count)
1149 {
1150 int result, count1;
1151 struct snd_rawmidi_runtime *runtime = substream->runtime;
1152
1153 if (runtime->buffer == NULL) {
1154 rmidi_dbg(substream->rmidi,
1155 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1156 return -EINVAL;
1157 }
1158 result = 0;
1159 if (runtime->avail >= runtime->buffer_size) {
1160 /* warning: lowlevel layer MUST trigger down the hardware */
1161 goto __skip;
1162 }
1163 if (count == 1) { /* special case, faster code */
1164 *buffer = runtime->buffer[runtime->hw_ptr];
1165 result++;
1166 } else {
1167 count1 = runtime->buffer_size - runtime->hw_ptr;
1168 if (count1 > count)
1169 count1 = count;
1170 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1171 count1 = runtime->buffer_size - runtime->avail;
1172 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1173 count -= count1;
1174 result += count1;
1175 if (count > 0) {
1176 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1177 count = runtime->buffer_size - runtime->avail - count1;
1178 memcpy(buffer + count1, runtime->buffer, count);
1179 result += count;
1180 }
1181 }
1182 __skip:
1183 return result;
1184 }
1185 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1186
1187 /**
1188 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1189 * @substream: the rawmidi substream
1190 * @buffer: the buffer pointer
1191 * @count: data size to transfer
1192 *
1193 * Copies data from the internal output buffer to the given buffer.
1194 *
1195 * Call this in the interrupt handler when the midi output is ready,
1196 * and call snd_rawmidi_transmit_ack() after the transmission is
1197 * finished.
1198 *
1199 * Return: The size of copied data, or a negative error code on failure.
1200 */
1201 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1202 unsigned char *buffer, int count)
1203 {
1204 struct snd_rawmidi_runtime *runtime = substream->runtime;
1205 int result;
1206 unsigned long flags;
1207
1208 spin_lock_irqsave(&runtime->lock, flags);
1209 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1210 spin_unlock_irqrestore(&runtime->lock, flags);
1211 return result;
1212 }
1213 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1214
1215 /**
1216 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1217 * @substream: the rawmidi substream
1218 * @count: the transferred count
1219 *
1220 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1221 */
1222 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1223 {
1224 struct snd_rawmidi_runtime *runtime = substream->runtime;
1225
1226 if (runtime->buffer == NULL) {
1227 rmidi_dbg(substream->rmidi,
1228 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1229 return -EINVAL;
1230 }
1231 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1232 runtime->hw_ptr += count;
1233 runtime->hw_ptr %= runtime->buffer_size;
1234 runtime->avail += count;
1235 substream->bytes += count;
1236 if (count > 0) {
1237 if (runtime->drain || snd_rawmidi_ready(substream))
1238 wake_up(&runtime->sleep);
1239 }
1240 return count;
1241 }
1242 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1243
1244 /**
1245 * snd_rawmidi_transmit_ack - acknowledge the transmission
1246 * @substream: the rawmidi substream
1247 * @count: the transferred count
1248 *
1249 * Advances the hardware pointer for the internal output buffer with
1250 * the given size and updates the condition.
1251 * Call after the transmission is finished.
1252 *
1253 * Return: The advanced size if successful, or a negative error code on failure.
1254 */
1255 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1256 {
1257 struct snd_rawmidi_runtime *runtime = substream->runtime;
1258 int result;
1259 unsigned long flags;
1260
1261 spin_lock_irqsave(&runtime->lock, flags);
1262 result = __snd_rawmidi_transmit_ack(substream, count);
1263 spin_unlock_irqrestore(&runtime->lock, flags);
1264 return result;
1265 }
1266 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1267
1268 /**
1269 * snd_rawmidi_transmit - copy from the buffer to the device
1270 * @substream: the rawmidi substream
1271 * @buffer: the buffer pointer
1272 * @count: the data size to transfer
1273 *
1274 * Copies data from the buffer to the device and advances the pointer.
1275 *
1276 * Return: The copied size if successful, or a negative error code on failure.
1277 */
1278 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1279 unsigned char *buffer, int count)
1280 {
1281 struct snd_rawmidi_runtime *runtime = substream->runtime;
1282 int result;
1283 unsigned long flags;
1284
1285 spin_lock_irqsave(&runtime->lock, flags);
1286 if (!substream->opened)
1287 result = -EBADFD;
1288 else {
1289 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1290 if (count <= 0)
1291 result = count;
1292 else
1293 result = __snd_rawmidi_transmit_ack(substream, count);
1294 }
1295 spin_unlock_irqrestore(&runtime->lock, flags);
1296 return result;
1297 }
1298 EXPORT_SYMBOL(snd_rawmidi_transmit);
1299
1300 /**
1301 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1302 * @substream: rawmidi substream
1303 *
1304 * Return: the number of discarded bytes
1305 */
1306 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1307 {
1308 struct snd_rawmidi_runtime *runtime = substream->runtime;
1309 unsigned long flags;
1310 int count = 0;
1311
1312 spin_lock_irqsave(&runtime->lock, flags);
1313 if (runtime->avail < runtime->buffer_size) {
1314 count = runtime->buffer_size - runtime->avail;
1315 __snd_rawmidi_transmit_ack(substream, count);
1316 }
1317 spin_unlock_irqrestore(&runtime->lock, flags);
1318 return count;
1319 }
1320 EXPORT_SYMBOL(snd_rawmidi_proceed);
1321
1322 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1323 const unsigned char __user *userbuf,
1324 const unsigned char *kernelbuf,
1325 long count)
1326 {
1327 unsigned long flags;
1328 long count1, result;
1329 struct snd_rawmidi_runtime *runtime = substream->runtime;
1330 unsigned long appl_ptr;
1331
1332 if (!kernelbuf && !userbuf)
1333 return -EINVAL;
1334 if (snd_BUG_ON(!runtime->buffer))
1335 return -EINVAL;
1336
1337 result = 0;
1338 spin_lock_irqsave(&runtime->lock, flags);
1339 if (substream->append) {
1340 if ((long)runtime->avail < count) {
1341 spin_unlock_irqrestore(&runtime->lock, flags);
1342 return -EAGAIN;
1343 }
1344 }
1345 while (count > 0 && runtime->avail > 0) {
1346 count1 = runtime->buffer_size - runtime->appl_ptr;
1347 if (count1 > count)
1348 count1 = count;
1349 if (count1 > (long)runtime->avail)
1350 count1 = runtime->avail;
1351
1352 /* update runtime->appl_ptr before unlocking for userbuf */
1353 appl_ptr = runtime->appl_ptr;
1354 runtime->appl_ptr += count1;
1355 runtime->appl_ptr %= runtime->buffer_size;
1356 runtime->avail -= count1;
1357
1358 if (kernelbuf)
1359 memcpy(runtime->buffer + appl_ptr,
1360 kernelbuf + result, count1);
1361 else if (userbuf) {
1362 spin_unlock_irqrestore(&runtime->lock, flags);
1363 if (copy_from_user(runtime->buffer + appl_ptr,
1364 userbuf + result, count1)) {
1365 spin_lock_irqsave(&runtime->lock, flags);
1366 result = result > 0 ? result : -EFAULT;
1367 goto __end;
1368 }
1369 spin_lock_irqsave(&runtime->lock, flags);
1370 }
1371 result += count1;
1372 count -= count1;
1373 }
1374 __end:
1375 count1 = runtime->avail < runtime->buffer_size;
1376 spin_unlock_irqrestore(&runtime->lock, flags);
1377 if (count1)
1378 snd_rawmidi_output_trigger(substream, 1);
1379 return result;
1380 }
1381
1382 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1383 const unsigned char *buf, long count)
1384 {
1385 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1386 }
1387 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1388
1389 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1390 size_t count, loff_t *offset)
1391 {
1392 long result, timeout;
1393 int count1;
1394 struct snd_rawmidi_file *rfile;
1395 struct snd_rawmidi_runtime *runtime;
1396 struct snd_rawmidi_substream *substream;
1397
1398 rfile = file->private_data;
1399 substream = rfile->output;
1400 runtime = substream->runtime;
1401 /* we cannot put an atomic message to our buffer */
1402 if (substream->append && count > runtime->buffer_size)
1403 return -EIO;
1404 result = 0;
1405 while (count > 0) {
1406 spin_lock_irq(&runtime->lock);
1407 while (!snd_rawmidi_ready_append(substream, count)) {
1408 wait_queue_entry_t wait;
1409
1410 if (file->f_flags & O_NONBLOCK) {
1411 spin_unlock_irq(&runtime->lock);
1412 return result > 0 ? result : -EAGAIN;
1413 }
1414 init_waitqueue_entry(&wait, current);
1415 add_wait_queue(&runtime->sleep, &wait);
1416 set_current_state(TASK_INTERRUPTIBLE);
1417 spin_unlock_irq(&runtime->lock);
1418 timeout = schedule_timeout(30 * HZ);
1419 remove_wait_queue(&runtime->sleep, &wait);
1420 if (rfile->rmidi->card->shutdown)
1421 return -ENODEV;
1422 if (signal_pending(current))
1423 return result > 0 ? result : -ERESTARTSYS;
1424 if (!runtime->avail && !timeout)
1425 return result > 0 ? result : -EIO;
1426 spin_lock_irq(&runtime->lock);
1427 }
1428 spin_unlock_irq(&runtime->lock);
1429 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1430 if (count1 < 0)
1431 return result > 0 ? result : count1;
1432 result += count1;
1433 buf += count1;
1434 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1435 break;
1436 count -= count1;
1437 }
1438 if (file->f_flags & O_DSYNC) {
1439 spin_lock_irq(&runtime->lock);
1440 while (runtime->avail != runtime->buffer_size) {
1441 wait_queue_entry_t wait;
1442 unsigned int last_avail = runtime->avail;
1443
1444 init_waitqueue_entry(&wait, current);
1445 add_wait_queue(&runtime->sleep, &wait);
1446 set_current_state(TASK_INTERRUPTIBLE);
1447 spin_unlock_irq(&runtime->lock);
1448 timeout = schedule_timeout(30 * HZ);
1449 remove_wait_queue(&runtime->sleep, &wait);
1450 if (signal_pending(current))
1451 return result > 0 ? result : -ERESTARTSYS;
1452 if (runtime->avail == last_avail && !timeout)
1453 return result > 0 ? result : -EIO;
1454 spin_lock_irq(&runtime->lock);
1455 }
1456 spin_unlock_irq(&runtime->lock);
1457 }
1458 return result;
1459 }
1460
1461 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1462 {
1463 struct snd_rawmidi_file *rfile;
1464 struct snd_rawmidi_runtime *runtime;
1465 __poll_t mask;
1466
1467 rfile = file->private_data;
1468 if (rfile->input != NULL) {
1469 runtime = rfile->input->runtime;
1470 snd_rawmidi_input_trigger(rfile->input, 1);
1471 poll_wait(file, &runtime->sleep, wait);
1472 }
1473 if (rfile->output != NULL) {
1474 runtime = rfile->output->runtime;
1475 poll_wait(file, &runtime->sleep, wait);
1476 }
1477 mask = 0;
1478 if (rfile->input != NULL) {
1479 if (snd_rawmidi_ready(rfile->input))
1480 mask |= EPOLLIN | EPOLLRDNORM;
1481 }
1482 if (rfile->output != NULL) {
1483 if (snd_rawmidi_ready(rfile->output))
1484 mask |= EPOLLOUT | EPOLLWRNORM;
1485 }
1486 return mask;
1487 }
1488
1489 /*
1490 */
1491 #ifdef CONFIG_COMPAT
1492 #include "rawmidi_compat.c"
1493 #else
1494 #define snd_rawmidi_ioctl_compat NULL
1495 #endif
1496
1497 /*
1498 */
1499
1500 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1501 struct snd_info_buffer *buffer)
1502 {
1503 struct snd_rawmidi *rmidi;
1504 struct snd_rawmidi_substream *substream;
1505 struct snd_rawmidi_runtime *runtime;
1506
1507 rmidi = entry->private_data;
1508 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1509 mutex_lock(&rmidi->open_mutex);
1510 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1511 list_for_each_entry(substream,
1512 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1513 list) {
1514 snd_iprintf(buffer,
1515 "Output %d\n"
1516 " Tx bytes : %lu\n",
1517 substream->number,
1518 (unsigned long) substream->bytes);
1519 if (substream->opened) {
1520 snd_iprintf(buffer,
1521 " Owner PID : %d\n",
1522 pid_vnr(substream->pid));
1523 runtime = substream->runtime;
1524 snd_iprintf(buffer,
1525 " Mode : %s\n"
1526 " Buffer size : %lu\n"
1527 " Avail : %lu\n",
1528 runtime->oss ? "OSS compatible" : "native",
1529 (unsigned long) runtime->buffer_size,
1530 (unsigned long) runtime->avail);
1531 }
1532 }
1533 }
1534 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1535 list_for_each_entry(substream,
1536 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1537 list) {
1538 snd_iprintf(buffer,
1539 "Input %d\n"
1540 " Rx bytes : %lu\n",
1541 substream->number,
1542 (unsigned long) substream->bytes);
1543 if (substream->opened) {
1544 snd_iprintf(buffer,
1545 " Owner PID : %d\n",
1546 pid_vnr(substream->pid));
1547 runtime = substream->runtime;
1548 snd_iprintf(buffer,
1549 " Buffer size : %lu\n"
1550 " Avail : %lu\n"
1551 " Overruns : %lu\n",
1552 (unsigned long) runtime->buffer_size,
1553 (unsigned long) runtime->avail,
1554 (unsigned long) runtime->xruns);
1555 }
1556 }
1557 }
1558 mutex_unlock(&rmidi->open_mutex);
1559 }
1560
1561 /*
1562 * Register functions
1563 */
1564
1565 static const struct file_operations snd_rawmidi_f_ops = {
1566 .owner = THIS_MODULE,
1567 .read = snd_rawmidi_read,
1568 .write = snd_rawmidi_write,
1569 .open = snd_rawmidi_open,
1570 .release = snd_rawmidi_release,
1571 .llseek = no_llseek,
1572 .poll = snd_rawmidi_poll,
1573 .unlocked_ioctl = snd_rawmidi_ioctl,
1574 .compat_ioctl = snd_rawmidi_ioctl_compat,
1575 };
1576
1577 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1578 struct snd_rawmidi_str *stream,
1579 int direction,
1580 int count)
1581 {
1582 struct snd_rawmidi_substream *substream;
1583 int idx;
1584
1585 for (idx = 0; idx < count; idx++) {
1586 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1587 if (!substream)
1588 return -ENOMEM;
1589 substream->stream = direction;
1590 substream->number = idx;
1591 substream->rmidi = rmidi;
1592 substream->pstr = stream;
1593 list_add_tail(&substream->list, &stream->substreams);
1594 stream->substream_count++;
1595 }
1596 return 0;
1597 }
1598
1599 static void release_rawmidi_device(struct device *dev)
1600 {
1601 kfree(container_of(dev, struct snd_rawmidi, dev));
1602 }
1603
1604 /**
1605 * snd_rawmidi_new - create a rawmidi instance
1606 * @card: the card instance
1607 * @id: the id string
1608 * @device: the device index
1609 * @output_count: the number of output streams
1610 * @input_count: the number of input streams
1611 * @rrawmidi: the pointer to store the new rawmidi instance
1612 *
1613 * Creates a new rawmidi instance.
1614 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1615 *
1616 * Return: Zero if successful, or a negative error code on failure.
1617 */
1618 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1619 int output_count, int input_count,
1620 struct snd_rawmidi **rrawmidi)
1621 {
1622 struct snd_rawmidi *rmidi;
1623 int err;
1624 static const struct snd_device_ops ops = {
1625 .dev_free = snd_rawmidi_dev_free,
1626 .dev_register = snd_rawmidi_dev_register,
1627 .dev_disconnect = snd_rawmidi_dev_disconnect,
1628 };
1629
1630 if (snd_BUG_ON(!card))
1631 return -ENXIO;
1632 if (rrawmidi)
1633 *rrawmidi = NULL;
1634 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1635 if (!rmidi)
1636 return -ENOMEM;
1637 rmidi->card = card;
1638 rmidi->device = device;
1639 mutex_init(&rmidi->open_mutex);
1640 init_waitqueue_head(&rmidi->open_wait);
1641 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1642 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1643
1644 if (id != NULL)
1645 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1646
1647 snd_device_initialize(&rmidi->dev, card);
1648 rmidi->dev.release = release_rawmidi_device;
1649 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1650
1651 err = snd_rawmidi_alloc_substreams(rmidi,
1652 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1653 SNDRV_RAWMIDI_STREAM_INPUT,
1654 input_count);
1655 if (err < 0)
1656 goto error;
1657 err = snd_rawmidi_alloc_substreams(rmidi,
1658 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1659 SNDRV_RAWMIDI_STREAM_OUTPUT,
1660 output_count);
1661 if (err < 0)
1662 goto error;
1663 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1664 if (err < 0)
1665 goto error;
1666
1667 if (rrawmidi)
1668 *rrawmidi = rmidi;
1669 return 0;
1670
1671 error:
1672 snd_rawmidi_free(rmidi);
1673 return err;
1674 }
1675 EXPORT_SYMBOL(snd_rawmidi_new);
1676
1677 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1678 {
1679 struct snd_rawmidi_substream *substream;
1680
1681 while (!list_empty(&stream->substreams)) {
1682 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1683 list_del(&substream->list);
1684 kfree(substream);
1685 }
1686 }
1687
1688 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1689 {
1690 if (!rmidi)
1691 return 0;
1692
1693 snd_info_free_entry(rmidi->proc_entry);
1694 rmidi->proc_entry = NULL;
1695 mutex_lock(&register_mutex);
1696 if (rmidi->ops && rmidi->ops->dev_unregister)
1697 rmidi->ops->dev_unregister(rmidi);
1698 mutex_unlock(&register_mutex);
1699
1700 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1701 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1702 if (rmidi->private_free)
1703 rmidi->private_free(rmidi);
1704 put_device(&rmidi->dev);
1705 return 0;
1706 }
1707
1708 static int snd_rawmidi_dev_free(struct snd_device *device)
1709 {
1710 struct snd_rawmidi *rmidi = device->device_data;
1711
1712 return snd_rawmidi_free(rmidi);
1713 }
1714
1715 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1716 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1717 {
1718 struct snd_rawmidi *rmidi = device->private_data;
1719
1720 rmidi->seq_dev = NULL;
1721 }
1722 #endif
1723
1724 static int snd_rawmidi_dev_register(struct snd_device *device)
1725 {
1726 int err;
1727 struct snd_info_entry *entry;
1728 char name[16];
1729 struct snd_rawmidi *rmidi = device->device_data;
1730
1731 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1732 return -ENOMEM;
1733 err = 0;
1734 mutex_lock(&register_mutex);
1735 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1736 err = -EBUSY;
1737 else
1738 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1739 mutex_unlock(&register_mutex);
1740 if (err < 0)
1741 return err;
1742
1743 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1744 rmidi->card, rmidi->device,
1745 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1746 if (err < 0) {
1747 rmidi_err(rmidi, "unable to register\n");
1748 goto error;
1749 }
1750 if (rmidi->ops && rmidi->ops->dev_register) {
1751 err = rmidi->ops->dev_register(rmidi);
1752 if (err < 0)
1753 goto error_unregister;
1754 }
1755 #ifdef CONFIG_SND_OSSEMUL
1756 rmidi->ossreg = 0;
1757 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1758 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1759 rmidi->card, 0, &snd_rawmidi_f_ops,
1760 rmidi) < 0) {
1761 rmidi_err(rmidi,
1762 "unable to register OSS rawmidi device %i:%i\n",
1763 rmidi->card->number, 0);
1764 } else {
1765 rmidi->ossreg++;
1766 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1767 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1768 #endif
1769 }
1770 }
1771 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1772 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1773 rmidi->card, 1, &snd_rawmidi_f_ops,
1774 rmidi) < 0) {
1775 rmidi_err(rmidi,
1776 "unable to register OSS rawmidi device %i:%i\n",
1777 rmidi->card->number, 1);
1778 } else {
1779 rmidi->ossreg++;
1780 }
1781 }
1782 #endif /* CONFIG_SND_OSSEMUL */
1783 sprintf(name, "midi%d", rmidi->device);
1784 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1785 if (entry) {
1786 entry->private_data = rmidi;
1787 entry->c.text.read = snd_rawmidi_proc_info_read;
1788 if (snd_info_register(entry) < 0) {
1789 snd_info_free_entry(entry);
1790 entry = NULL;
1791 }
1792 }
1793 rmidi->proc_entry = entry;
1794 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1795 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1796 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1797 rmidi->seq_dev->private_data = rmidi;
1798 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1799 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1800 snd_device_register(rmidi->card, rmidi->seq_dev);
1801 }
1802 }
1803 #endif
1804 return 0;
1805
1806 error_unregister:
1807 snd_unregister_device(&rmidi->dev);
1808 error:
1809 mutex_lock(&register_mutex);
1810 list_del(&rmidi->list);
1811 mutex_unlock(&register_mutex);
1812 return err;
1813 }
1814
1815 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1816 {
1817 struct snd_rawmidi *rmidi = device->device_data;
1818 int dir;
1819
1820 mutex_lock(&register_mutex);
1821 mutex_lock(&rmidi->open_mutex);
1822 wake_up(&rmidi->open_wait);
1823 list_del_init(&rmidi->list);
1824 for (dir = 0; dir < 2; dir++) {
1825 struct snd_rawmidi_substream *s;
1826
1827 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1828 if (s->runtime)
1829 wake_up(&s->runtime->sleep);
1830 }
1831 }
1832
1833 #ifdef CONFIG_SND_OSSEMUL
1834 if (rmidi->ossreg) {
1835 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1836 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1837 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1838 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1839 #endif
1840 }
1841 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1842 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1843 rmidi->ossreg = 0;
1844 }
1845 #endif /* CONFIG_SND_OSSEMUL */
1846 snd_unregister_device(&rmidi->dev);
1847 mutex_unlock(&rmidi->open_mutex);
1848 mutex_unlock(&register_mutex);
1849 return 0;
1850 }
1851
1852 /**
1853 * snd_rawmidi_set_ops - set the rawmidi operators
1854 * @rmidi: the rawmidi instance
1855 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1856 * @ops: the operator table
1857 *
1858 * Sets the rawmidi operators for the given stream direction.
1859 */
1860 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1861 const struct snd_rawmidi_ops *ops)
1862 {
1863 struct snd_rawmidi_substream *substream;
1864
1865 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1866 substream->ops = ops;
1867 }
1868 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1869
1870 /*
1871 * ENTRY functions
1872 */
1873
1874 static int __init alsa_rawmidi_init(void)
1875 {
1876
1877 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1878 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1879 #ifdef CONFIG_SND_OSSEMUL
1880 { int i;
1881 /* check device map table */
1882 for (i = 0; i < SNDRV_CARDS; i++) {
1883 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1884 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1885 i, midi_map[i]);
1886 midi_map[i] = 0;
1887 }
1888 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1889 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1890 i, amidi_map[i]);
1891 amidi_map[i] = 1;
1892 }
1893 }
1894 }
1895 #endif /* CONFIG_SND_OSSEMUL */
1896 return 0;
1897 }
1898
1899 static void __exit alsa_rawmidi_exit(void)
1900 {
1901 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1902 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1903 }
1904
1905 module_init(alsa_rawmidi_init)
1906 module_exit(alsa_rawmidi_exit)
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