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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
25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
26MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
27MODULE_LICENSE("GPL");
28
29#ifdef CONFIG_SND_OSSEMUL
30static int midi_map[SNDRV_CARDS];
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
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);
42
43static LIST_HEAD(snd_rawmidi_devices);
44static 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
53struct 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
64struct 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
76static 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
86static 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
98static 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
105static 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
114static 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/* buffer refcount management: call with runtime->lock held */
124static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
125{
126 runtime->buffer_ref++;
127}
128
129static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
130{
131 runtime->buffer_ref--;
132}
133
134static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
135{
136 struct snd_rawmidi_runtime *runtime;
137
138 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
139 if (!runtime)
140 return -ENOMEM;
141 runtime->substream = substream;
142 spin_lock_init(&runtime->lock);
143 init_waitqueue_head(&runtime->sleep);
144 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
145 runtime->event = NULL;
146 runtime->buffer_size = PAGE_SIZE;
147 runtime->avail_min = 1;
148 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
149 runtime->avail = 0;
150 else
151 runtime->avail = runtime->buffer_size;
152 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
153 if (!runtime->buffer) {
154 kfree(runtime);
155 return -ENOMEM;
156 }
157 runtime->appl_ptr = runtime->hw_ptr = 0;
158 substream->runtime = runtime;
159 return 0;
160}
161
162static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
163{
164 struct snd_rawmidi_runtime *runtime = substream->runtime;
165
166 kvfree(runtime->buffer);
167 kfree(runtime);
168 substream->runtime = NULL;
169 return 0;
170}
171
172static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
173{
174 if (!substream->opened)
175 return;
176 substream->ops->trigger(substream, up);
177}
178
179static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
180{
181 if (!substream->opened)
182 return;
183 substream->ops->trigger(substream, up);
184 if (!up)
185 cancel_work_sync(&substream->runtime->event_work);
186}
187
188static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
189 bool is_input)
190{
191 runtime->drain = 0;
192 runtime->appl_ptr = runtime->hw_ptr = 0;
193 runtime->avail = is_input ? 0 : runtime->buffer_size;
194}
195
196static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
197 bool is_input)
198{
199 unsigned long flags;
200
201 spin_lock_irqsave(&runtime->lock, flags);
202 __reset_runtime_ptrs(runtime, is_input);
203 spin_unlock_irqrestore(&runtime->lock, flags);
204}
205
206int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
207{
208 snd_rawmidi_output_trigger(substream, 0);
209 reset_runtime_ptrs(substream->runtime, false);
210 return 0;
211}
212EXPORT_SYMBOL(snd_rawmidi_drop_output);
213
214int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
215{
216 int err;
217 long timeout;
218 struct snd_rawmidi_runtime *runtime = substream->runtime;
219
220 err = 0;
221 runtime->drain = 1;
222 timeout = wait_event_interruptible_timeout(runtime->sleep,
223 (runtime->avail >= runtime->buffer_size),
224 10*HZ);
225 if (signal_pending(current))
226 err = -ERESTARTSYS;
227 if (runtime->avail < runtime->buffer_size && !timeout) {
228 rmidi_warn(substream->rmidi,
229 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
230 (long)runtime->avail, (long)runtime->buffer_size);
231 err = -EIO;
232 }
233 runtime->drain = 0;
234 if (err != -ERESTARTSYS) {
235 /* we need wait a while to make sure that Tx FIFOs are empty */
236 if (substream->ops->drain)
237 substream->ops->drain(substream);
238 else
239 msleep(50);
240 snd_rawmidi_drop_output(substream);
241 }
242 return err;
243}
244EXPORT_SYMBOL(snd_rawmidi_drain_output);
245
246int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
247{
248 snd_rawmidi_input_trigger(substream, 0);
249 reset_runtime_ptrs(substream->runtime, true);
250 return 0;
251}
252EXPORT_SYMBOL(snd_rawmidi_drain_input);
253
254/* look for an available substream for the given stream direction;
255 * if a specific subdevice is given, try to assign it
256 */
257static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
258 int stream, int mode,
259 struct snd_rawmidi_substream **sub_ret)
260{
261 struct snd_rawmidi_substream *substream;
262 struct snd_rawmidi_str *s = &rmidi->streams[stream];
263 static const unsigned int info_flags[2] = {
264 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
265 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
266 };
267
268 if (!(rmidi->info_flags & info_flags[stream]))
269 return -ENXIO;
270 if (subdevice >= 0 && subdevice >= s->substream_count)
271 return -ENODEV;
272
273 list_for_each_entry(substream, &s->substreams, list) {
274 if (substream->opened) {
275 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
276 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
277 !substream->append)
278 continue;
279 }
280 if (subdevice < 0 || subdevice == substream->number) {
281 *sub_ret = substream;
282 return 0;
283 }
284 }
285 return -EAGAIN;
286}
287
288/* open and do ref-counting for the given substream */
289static int open_substream(struct snd_rawmidi *rmidi,
290 struct snd_rawmidi_substream *substream,
291 int mode)
292{
293 int err;
294
295 if (substream->use_count == 0) {
296 err = snd_rawmidi_runtime_create(substream);
297 if (err < 0)
298 return err;
299 err = substream->ops->open(substream);
300 if (err < 0) {
301 snd_rawmidi_runtime_free(substream);
302 return err;
303 }
304 substream->opened = 1;
305 substream->active_sensing = 0;
306 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
307 substream->append = 1;
308 substream->pid = get_pid(task_pid(current));
309 rmidi->streams[substream->stream].substream_opened++;
310 }
311 substream->use_count++;
312 return 0;
313}
314
315static void close_substream(struct snd_rawmidi *rmidi,
316 struct snd_rawmidi_substream *substream,
317 int cleanup);
318
319static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
320 struct snd_rawmidi_file *rfile)
321{
322 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
323 int err;
324
325 rfile->input = rfile->output = NULL;
326 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
327 err = assign_substream(rmidi, subdevice,
328 SNDRV_RAWMIDI_STREAM_INPUT,
329 mode, &sinput);
330 if (err < 0)
331 return err;
332 }
333 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
334 err = assign_substream(rmidi, subdevice,
335 SNDRV_RAWMIDI_STREAM_OUTPUT,
336 mode, &soutput);
337 if (err < 0)
338 return err;
339 }
340
341 if (sinput) {
342 err = open_substream(rmidi, sinput, mode);
343 if (err < 0)
344 return err;
345 }
346 if (soutput) {
347 err = open_substream(rmidi, soutput, mode);
348 if (err < 0) {
349 if (sinput)
350 close_substream(rmidi, sinput, 0);
351 return err;
352 }
353 }
354
355 rfile->rmidi = rmidi;
356 rfile->input = sinput;
357 rfile->output = soutput;
358 return 0;
359}
360
361/* called from sound/core/seq/seq_midi.c */
362int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
363 int mode, struct snd_rawmidi_file *rfile)
364{
365 struct snd_rawmidi *rmidi;
366 int err = 0;
367
368 if (snd_BUG_ON(!rfile))
369 return -EINVAL;
370
371 mutex_lock(®ister_mutex);
372 rmidi = snd_rawmidi_search(card, device);
373 if (!rmidi)
374 err = -ENODEV;
375 else if (!try_module_get(rmidi->card->module))
376 err = -ENXIO;
377 mutex_unlock(®ister_mutex);
378 if (err < 0)
379 return err;
380
381 mutex_lock(&rmidi->open_mutex);
382 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
383 mutex_unlock(&rmidi->open_mutex);
384 if (err < 0)
385 module_put(rmidi->card->module);
386 return err;
387}
388EXPORT_SYMBOL(snd_rawmidi_kernel_open);
389
390static int snd_rawmidi_open(struct inode *inode, struct file *file)
391{
392 int maj = imajor(inode);
393 struct snd_card *card;
394 int subdevice;
395 unsigned short fflags;
396 int err;
397 struct snd_rawmidi *rmidi;
398 struct snd_rawmidi_file *rawmidi_file = NULL;
399 wait_queue_entry_t wait;
400
401 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
402 return -EINVAL; /* invalid combination */
403
404 err = stream_open(inode, file);
405 if (err < 0)
406 return err;
407
408 if (maj == snd_major) {
409 rmidi = snd_lookup_minor_data(iminor(inode),
410 SNDRV_DEVICE_TYPE_RAWMIDI);
411#ifdef CONFIG_SND_OSSEMUL
412 } else if (maj == SOUND_MAJOR) {
413 rmidi = snd_lookup_oss_minor_data(iminor(inode),
414 SNDRV_OSS_DEVICE_TYPE_MIDI);
415#endif
416 } else
417 return -ENXIO;
418
419 if (rmidi == NULL)
420 return -ENODEV;
421
422 if (!try_module_get(rmidi->card->module)) {
423 snd_card_unref(rmidi->card);
424 return -ENXIO;
425 }
426
427 mutex_lock(&rmidi->open_mutex);
428 card = rmidi->card;
429 err = snd_card_file_add(card, file);
430 if (err < 0)
431 goto __error_card;
432 fflags = snd_rawmidi_file_flags(file);
433 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
434 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
435 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
436 if (rawmidi_file == NULL) {
437 err = -ENOMEM;
438 goto __error;
439 }
440 init_waitqueue_entry(&wait, current);
441 add_wait_queue(&rmidi->open_wait, &wait);
442 while (1) {
443 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
444 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
445 if (err >= 0)
446 break;
447 if (err == -EAGAIN) {
448 if (file->f_flags & O_NONBLOCK) {
449 err = -EBUSY;
450 break;
451 }
452 } else
453 break;
454 set_current_state(TASK_INTERRUPTIBLE);
455 mutex_unlock(&rmidi->open_mutex);
456 schedule();
457 mutex_lock(&rmidi->open_mutex);
458 if (rmidi->card->shutdown) {
459 err = -ENODEV;
460 break;
461 }
462 if (signal_pending(current)) {
463 err = -ERESTARTSYS;
464 break;
465 }
466 }
467 remove_wait_queue(&rmidi->open_wait, &wait);
468 if (err < 0) {
469 kfree(rawmidi_file);
470 goto __error;
471 }
472#ifdef CONFIG_SND_OSSEMUL
473 if (rawmidi_file->input && rawmidi_file->input->runtime)
474 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
475 if (rawmidi_file->output && rawmidi_file->output->runtime)
476 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
477#endif
478 file->private_data = rawmidi_file;
479 mutex_unlock(&rmidi->open_mutex);
480 snd_card_unref(rmidi->card);
481 return 0;
482
483 __error:
484 snd_card_file_remove(card, file);
485 __error_card:
486 mutex_unlock(&rmidi->open_mutex);
487 module_put(rmidi->card->module);
488 snd_card_unref(rmidi->card);
489 return err;
490}
491
492static void close_substream(struct snd_rawmidi *rmidi,
493 struct snd_rawmidi_substream *substream,
494 int cleanup)
495{
496 if (--substream->use_count)
497 return;
498
499 if (cleanup) {
500 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
501 snd_rawmidi_input_trigger(substream, 0);
502 else {
503 if (substream->active_sensing) {
504 unsigned char buf = 0xfe;
505 /* sending single active sensing message
506 * to shut the device up
507 */
508 snd_rawmidi_kernel_write(substream, &buf, 1);
509 }
510 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
511 snd_rawmidi_output_trigger(substream, 0);
512 }
513 }
514 substream->ops->close(substream);
515 if (substream->runtime->private_free)
516 substream->runtime->private_free(substream);
517 snd_rawmidi_runtime_free(substream);
518 substream->opened = 0;
519 substream->append = 0;
520 put_pid(substream->pid);
521 substream->pid = NULL;
522 rmidi->streams[substream->stream].substream_opened--;
523}
524
525static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
526{
527 struct snd_rawmidi *rmidi;
528
529 rmidi = rfile->rmidi;
530 mutex_lock(&rmidi->open_mutex);
531 if (rfile->input) {
532 close_substream(rmidi, rfile->input, 1);
533 rfile->input = NULL;
534 }
535 if (rfile->output) {
536 close_substream(rmidi, rfile->output, 1);
537 rfile->output = NULL;
538 }
539 rfile->rmidi = NULL;
540 mutex_unlock(&rmidi->open_mutex);
541 wake_up(&rmidi->open_wait);
542}
543
544/* called from sound/core/seq/seq_midi.c */
545int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
546{
547 struct snd_rawmidi *rmidi;
548
549 if (snd_BUG_ON(!rfile))
550 return -ENXIO;
551
552 rmidi = rfile->rmidi;
553 rawmidi_release_priv(rfile);
554 module_put(rmidi->card->module);
555 return 0;
556}
557EXPORT_SYMBOL(snd_rawmidi_kernel_release);
558
559static int snd_rawmidi_release(struct inode *inode, struct file *file)
560{
561 struct snd_rawmidi_file *rfile;
562 struct snd_rawmidi *rmidi;
563 struct module *module;
564
565 rfile = file->private_data;
566 rmidi = rfile->rmidi;
567 rawmidi_release_priv(rfile);
568 kfree(rfile);
569 module = rmidi->card->module;
570 snd_card_file_remove(rmidi->card, file);
571 module_put(module);
572 return 0;
573}
574
575static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
576 struct snd_rawmidi_info *info)
577{
578 struct snd_rawmidi *rmidi;
579
580 if (substream == NULL)
581 return -ENODEV;
582 rmidi = substream->rmidi;
583 memset(info, 0, sizeof(*info));
584 info->card = rmidi->card->number;
585 info->device = rmidi->device;
586 info->subdevice = substream->number;
587 info->stream = substream->stream;
588 info->flags = rmidi->info_flags;
589 strcpy(info->id, rmidi->id);
590 strcpy(info->name, rmidi->name);
591 strcpy(info->subname, substream->name);
592 info->subdevices_count = substream->pstr->substream_count;
593 info->subdevices_avail = (substream->pstr->substream_count -
594 substream->pstr->substream_opened);
595 return 0;
596}
597
598static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
599 struct snd_rawmidi_info __user *_info)
600{
601 struct snd_rawmidi_info info;
602 int err;
603
604 err = snd_rawmidi_info(substream, &info);
605 if (err < 0)
606 return err;
607 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
608 return -EFAULT;
609 return 0;
610}
611
612static int __snd_rawmidi_info_select(struct snd_card *card,
613 struct snd_rawmidi_info *info)
614{
615 struct snd_rawmidi *rmidi;
616 struct snd_rawmidi_str *pstr;
617 struct snd_rawmidi_substream *substream;
618
619 rmidi = snd_rawmidi_search(card, info->device);
620 if (!rmidi)
621 return -ENXIO;
622 if (info->stream < 0 || info->stream > 1)
623 return -EINVAL;
624 info->stream = array_index_nospec(info->stream, 2);
625 pstr = &rmidi->streams[info->stream];
626 if (pstr->substream_count == 0)
627 return -ENOENT;
628 if (info->subdevice >= pstr->substream_count)
629 return -ENXIO;
630 list_for_each_entry(substream, &pstr->substreams, list) {
631 if ((unsigned int)substream->number == info->subdevice)
632 return snd_rawmidi_info(substream, info);
633 }
634 return -ENXIO;
635}
636
637int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
638{
639 int ret;
640
641 mutex_lock(®ister_mutex);
642 ret = __snd_rawmidi_info_select(card, info);
643 mutex_unlock(®ister_mutex);
644 return ret;
645}
646EXPORT_SYMBOL(snd_rawmidi_info_select);
647
648static int snd_rawmidi_info_select_user(struct snd_card *card,
649 struct snd_rawmidi_info __user *_info)
650{
651 int err;
652 struct snd_rawmidi_info info;
653
654 if (get_user(info.device, &_info->device))
655 return -EFAULT;
656 if (get_user(info.stream, &_info->stream))
657 return -EFAULT;
658 if (get_user(info.subdevice, &_info->subdevice))
659 return -EFAULT;
660 err = snd_rawmidi_info_select(card, &info);
661 if (err < 0)
662 return err;
663 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
664 return -EFAULT;
665 return 0;
666}
667
668static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
669 struct snd_rawmidi_params *params,
670 bool is_input)
671{
672 char *newbuf, *oldbuf;
673
674 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
675 return -EINVAL;
676 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
677 return -EINVAL;
678 if (params->buffer_size != runtime->buffer_size) {
679 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
680 if (!newbuf)
681 return -ENOMEM;
682 spin_lock_irq(&runtime->lock);
683 if (runtime->buffer_ref) {
684 spin_unlock_irq(&runtime->lock);
685 kvfree(newbuf);
686 return -EBUSY;
687 }
688 oldbuf = runtime->buffer;
689 runtime->buffer = newbuf;
690 runtime->buffer_size = params->buffer_size;
691 __reset_runtime_ptrs(runtime, is_input);
692 spin_unlock_irq(&runtime->lock);
693 kvfree(oldbuf);
694 }
695 runtime->avail_min = params->avail_min;
696 return 0;
697}
698
699int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
700 struct snd_rawmidi_params *params)
701{
702 if (substream->append && substream->use_count > 1)
703 return -EBUSY;
704 snd_rawmidi_drain_output(substream);
705 substream->active_sensing = !params->no_active_sensing;
706 return resize_runtime_buffer(substream->runtime, params, false);
707}
708EXPORT_SYMBOL(snd_rawmidi_output_params);
709
710int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
711 struct snd_rawmidi_params *params)
712{
713 snd_rawmidi_drain_input(substream);
714 return resize_runtime_buffer(substream->runtime, params, true);
715}
716EXPORT_SYMBOL(snd_rawmidi_input_params);
717
718static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
719 struct snd_rawmidi_status64 *status)
720{
721 struct snd_rawmidi_runtime *runtime = substream->runtime;
722
723 memset(status, 0, sizeof(*status));
724 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
725 spin_lock_irq(&runtime->lock);
726 status->avail = runtime->avail;
727 spin_unlock_irq(&runtime->lock);
728 return 0;
729}
730
731static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
732 struct snd_rawmidi_status64 *status)
733{
734 struct snd_rawmidi_runtime *runtime = substream->runtime;
735
736 memset(status, 0, sizeof(*status));
737 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
738 spin_lock_irq(&runtime->lock);
739 status->avail = runtime->avail;
740 status->xruns = runtime->xruns;
741 runtime->xruns = 0;
742 spin_unlock_irq(&runtime->lock);
743 return 0;
744}
745
746static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
747 struct snd_rawmidi_status32 __user *argp)
748{
749 int err = 0;
750 struct snd_rawmidi_status32 __user *status = argp;
751 struct snd_rawmidi_status32 status32;
752 struct snd_rawmidi_status64 status64;
753
754 if (copy_from_user(&status32, argp,
755 sizeof(struct snd_rawmidi_status32)))
756 return -EFAULT;
757
758 switch (status32.stream) {
759 case SNDRV_RAWMIDI_STREAM_OUTPUT:
760 if (rfile->output == NULL)
761 return -EINVAL;
762 err = snd_rawmidi_output_status(rfile->output, &status64);
763 break;
764 case SNDRV_RAWMIDI_STREAM_INPUT:
765 if (rfile->input == NULL)
766 return -EINVAL;
767 err = snd_rawmidi_input_status(rfile->input, &status64);
768 break;
769 default:
770 return -EINVAL;
771 }
772 if (err < 0)
773 return err;
774
775 status32 = (struct snd_rawmidi_status32) {
776 .stream = status64.stream,
777 .tstamp_sec = status64.tstamp_sec,
778 .tstamp_nsec = status64.tstamp_nsec,
779 .avail = status64.avail,
780 .xruns = status64.xruns,
781 };
782
783 if (copy_to_user(status, &status32, sizeof(*status)))
784 return -EFAULT;
785
786 return 0;
787}
788
789static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
790 struct snd_rawmidi_status64 __user *argp)
791{
792 int err = 0;
793 struct snd_rawmidi_status64 status;
794
795 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
796 return -EFAULT;
797
798 switch (status.stream) {
799 case SNDRV_RAWMIDI_STREAM_OUTPUT:
800 if (rfile->output == NULL)
801 return -EINVAL;
802 err = snd_rawmidi_output_status(rfile->output, &status);
803 break;
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 err = snd_rawmidi_input_status(rfile->input, &status);
808 break;
809 default:
810 return -EINVAL;
811 }
812 if (err < 0)
813 return err;
814 if (copy_to_user(argp, &status,
815 sizeof(struct snd_rawmidi_status64)))
816 return -EFAULT;
817 return 0;
818}
819
820static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
821{
822 struct snd_rawmidi_file *rfile;
823 void __user *argp = (void __user *)arg;
824
825 rfile = file->private_data;
826 if (((cmd >> 8) & 0xff) != 'W')
827 return -ENOTTY;
828 switch (cmd) {
829 case SNDRV_RAWMIDI_IOCTL_PVERSION:
830 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
831 case SNDRV_RAWMIDI_IOCTL_INFO:
832 {
833 int stream;
834 struct snd_rawmidi_info __user *info = argp;
835
836 if (get_user(stream, &info->stream))
837 return -EFAULT;
838 switch (stream) {
839 case SNDRV_RAWMIDI_STREAM_INPUT:
840 return snd_rawmidi_info_user(rfile->input, info);
841 case SNDRV_RAWMIDI_STREAM_OUTPUT:
842 return snd_rawmidi_info_user(rfile->output, info);
843 default:
844 return -EINVAL;
845 }
846 }
847 case SNDRV_RAWMIDI_IOCTL_PARAMS:
848 {
849 struct snd_rawmidi_params params;
850
851 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
852 return -EFAULT;
853 switch (params.stream) {
854 case SNDRV_RAWMIDI_STREAM_OUTPUT:
855 if (rfile->output == NULL)
856 return -EINVAL;
857 return snd_rawmidi_output_params(rfile->output, ¶ms);
858 case SNDRV_RAWMIDI_STREAM_INPUT:
859 if (rfile->input == NULL)
860 return -EINVAL;
861 return snd_rawmidi_input_params(rfile->input, ¶ms);
862 default:
863 return -EINVAL;
864 }
865 }
866 case SNDRV_RAWMIDI_IOCTL_STATUS32:
867 return snd_rawmidi_ioctl_status32(rfile, argp);
868 case SNDRV_RAWMIDI_IOCTL_STATUS64:
869 return snd_rawmidi_ioctl_status64(rfile, argp);
870 case SNDRV_RAWMIDI_IOCTL_DROP:
871 {
872 int val;
873
874 if (get_user(val, (int __user *) argp))
875 return -EFAULT;
876 switch (val) {
877 case SNDRV_RAWMIDI_STREAM_OUTPUT:
878 if (rfile->output == NULL)
879 return -EINVAL;
880 return snd_rawmidi_drop_output(rfile->output);
881 default:
882 return -EINVAL;
883 }
884 }
885 case SNDRV_RAWMIDI_IOCTL_DRAIN:
886 {
887 int val;
888
889 if (get_user(val, (int __user *) argp))
890 return -EFAULT;
891 switch (val) {
892 case SNDRV_RAWMIDI_STREAM_OUTPUT:
893 if (rfile->output == NULL)
894 return -EINVAL;
895 return snd_rawmidi_drain_output(rfile->output);
896 case SNDRV_RAWMIDI_STREAM_INPUT:
897 if (rfile->input == NULL)
898 return -EINVAL;
899 return snd_rawmidi_drain_input(rfile->input);
900 default:
901 return -EINVAL;
902 }
903 }
904 default:
905 rmidi_dbg(rfile->rmidi,
906 "rawmidi: unknown command = 0x%x\n", cmd);
907 }
908 return -ENOTTY;
909}
910
911static int snd_rawmidi_control_ioctl(struct snd_card *card,
912 struct snd_ctl_file *control,
913 unsigned int cmd,
914 unsigned long arg)
915{
916 void __user *argp = (void __user *)arg;
917
918 switch (cmd) {
919 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
920 {
921 int device;
922
923 if (get_user(device, (int __user *)argp))
924 return -EFAULT;
925 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
926 device = SNDRV_RAWMIDI_DEVICES - 1;
927 mutex_lock(®ister_mutex);
928 device = device < 0 ? 0 : device + 1;
929 while (device < SNDRV_RAWMIDI_DEVICES) {
930 if (snd_rawmidi_search(card, device))
931 break;
932 device++;
933 }
934 if (device == SNDRV_RAWMIDI_DEVICES)
935 device = -1;
936 mutex_unlock(®ister_mutex);
937 if (put_user(device, (int __user *)argp))
938 return -EFAULT;
939 return 0;
940 }
941 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
942 {
943 int val;
944
945 if (get_user(val, (int __user *)argp))
946 return -EFAULT;
947 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
948 return 0;
949 }
950 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
951 return snd_rawmidi_info_select_user(card, argp);
952 }
953 return -ENOIOCTLCMD;
954}
955
956/**
957 * snd_rawmidi_receive - receive the input data from the device
958 * @substream: the rawmidi substream
959 * @buffer: the buffer pointer
960 * @count: the data size to read
961 *
962 * Reads the data from the internal buffer.
963 *
964 * Return: The size of read data, or a negative error code on failure.
965 */
966int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
967 const unsigned char *buffer, int count)
968{
969 unsigned long flags;
970 int result = 0, count1;
971 struct snd_rawmidi_runtime *runtime = substream->runtime;
972
973 if (!substream->opened)
974 return -EBADFD;
975 if (runtime->buffer == NULL) {
976 rmidi_dbg(substream->rmidi,
977 "snd_rawmidi_receive: input is not active!!!\n");
978 return -EINVAL;
979 }
980 spin_lock_irqsave(&runtime->lock, flags);
981 if (count == 1) { /* special case, faster code */
982 substream->bytes++;
983 if (runtime->avail < runtime->buffer_size) {
984 runtime->buffer[runtime->hw_ptr++] = buffer[0];
985 runtime->hw_ptr %= runtime->buffer_size;
986 runtime->avail++;
987 result++;
988 } else {
989 runtime->xruns++;
990 }
991 } else {
992 substream->bytes += count;
993 count1 = runtime->buffer_size - runtime->hw_ptr;
994 if (count1 > count)
995 count1 = count;
996 if (count1 > (int)(runtime->buffer_size - runtime->avail))
997 count1 = runtime->buffer_size - runtime->avail;
998 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
999 runtime->hw_ptr += count1;
1000 runtime->hw_ptr %= runtime->buffer_size;
1001 runtime->avail += count1;
1002 count -= count1;
1003 result += count1;
1004 if (count > 0) {
1005 buffer += count1;
1006 count1 = count;
1007 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1008 count1 = runtime->buffer_size - runtime->avail;
1009 runtime->xruns += count - count1;
1010 }
1011 if (count1 > 0) {
1012 memcpy(runtime->buffer, buffer, count1);
1013 runtime->hw_ptr = count1;
1014 runtime->avail += count1;
1015 result += count1;
1016 }
1017 }
1018 }
1019 if (result > 0) {
1020 if (runtime->event)
1021 schedule_work(&runtime->event_work);
1022 else if (snd_rawmidi_ready(substream))
1023 wake_up(&runtime->sleep);
1024 }
1025 spin_unlock_irqrestore(&runtime->lock, flags);
1026 return result;
1027}
1028EXPORT_SYMBOL(snd_rawmidi_receive);
1029
1030static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1031 unsigned char __user *userbuf,
1032 unsigned char *kernelbuf, long count)
1033{
1034 unsigned long flags;
1035 long result = 0, count1;
1036 struct snd_rawmidi_runtime *runtime = substream->runtime;
1037 unsigned long appl_ptr;
1038 int err = 0;
1039
1040 spin_lock_irqsave(&runtime->lock, flags);
1041 snd_rawmidi_buffer_ref(runtime);
1042 while (count > 0 && runtime->avail) {
1043 count1 = runtime->buffer_size - runtime->appl_ptr;
1044 if (count1 > count)
1045 count1 = count;
1046 if (count1 > (int)runtime->avail)
1047 count1 = runtime->avail;
1048
1049 /* update runtime->appl_ptr before unlocking for userbuf */
1050 appl_ptr = runtime->appl_ptr;
1051 runtime->appl_ptr += count1;
1052 runtime->appl_ptr %= runtime->buffer_size;
1053 runtime->avail -= count1;
1054
1055 if (kernelbuf)
1056 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1057 if (userbuf) {
1058 spin_unlock_irqrestore(&runtime->lock, flags);
1059 if (copy_to_user(userbuf + result,
1060 runtime->buffer + appl_ptr, count1))
1061 err = -EFAULT;
1062 spin_lock_irqsave(&runtime->lock, flags);
1063 if (err)
1064 goto out;
1065 }
1066 result += count1;
1067 count -= count1;
1068 }
1069 out:
1070 snd_rawmidi_buffer_unref(runtime);
1071 spin_unlock_irqrestore(&runtime->lock, flags);
1072 return result > 0 ? result : err;
1073}
1074
1075long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1076 unsigned char *buf, long count)
1077{
1078 snd_rawmidi_input_trigger(substream, 1);
1079 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1080}
1081EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1082
1083static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1084 loff_t *offset)
1085{
1086 long result;
1087 int count1;
1088 struct snd_rawmidi_file *rfile;
1089 struct snd_rawmidi_substream *substream;
1090 struct snd_rawmidi_runtime *runtime;
1091
1092 rfile = file->private_data;
1093 substream = rfile->input;
1094 if (substream == NULL)
1095 return -EIO;
1096 runtime = substream->runtime;
1097 snd_rawmidi_input_trigger(substream, 1);
1098 result = 0;
1099 while (count > 0) {
1100 spin_lock_irq(&runtime->lock);
1101 while (!snd_rawmidi_ready(substream)) {
1102 wait_queue_entry_t wait;
1103
1104 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1105 spin_unlock_irq(&runtime->lock);
1106 return result > 0 ? result : -EAGAIN;
1107 }
1108 init_waitqueue_entry(&wait, current);
1109 add_wait_queue(&runtime->sleep, &wait);
1110 set_current_state(TASK_INTERRUPTIBLE);
1111 spin_unlock_irq(&runtime->lock);
1112 schedule();
1113 remove_wait_queue(&runtime->sleep, &wait);
1114 if (rfile->rmidi->card->shutdown)
1115 return -ENODEV;
1116 if (signal_pending(current))
1117 return result > 0 ? result : -ERESTARTSYS;
1118 if (!runtime->avail)
1119 return result > 0 ? result : -EIO;
1120 spin_lock_irq(&runtime->lock);
1121 }
1122 spin_unlock_irq(&runtime->lock);
1123 count1 = snd_rawmidi_kernel_read1(substream,
1124 (unsigned char __user *)buf,
1125 NULL/*kernelbuf*/,
1126 count);
1127 if (count1 < 0)
1128 return result > 0 ? result : count1;
1129 result += count1;
1130 buf += count1;
1131 count -= count1;
1132 }
1133 return result;
1134}
1135
1136/**
1137 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1138 * @substream: the rawmidi substream
1139 *
1140 * Return: 1 if the internal output buffer is empty, 0 if not.
1141 */
1142int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1143{
1144 struct snd_rawmidi_runtime *runtime = substream->runtime;
1145 int result;
1146 unsigned long flags;
1147
1148 if (runtime->buffer == NULL) {
1149 rmidi_dbg(substream->rmidi,
1150 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1151 return 1;
1152 }
1153 spin_lock_irqsave(&runtime->lock, flags);
1154 result = runtime->avail >= runtime->buffer_size;
1155 spin_unlock_irqrestore(&runtime->lock, flags);
1156 return result;
1157}
1158EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1159
1160/**
1161 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1162 * @substream: the rawmidi substream
1163 * @buffer: the buffer pointer
1164 * @count: data size to transfer
1165 *
1166 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1167 */
1168int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1169 unsigned char *buffer, int count)
1170{
1171 int result, count1;
1172 struct snd_rawmidi_runtime *runtime = substream->runtime;
1173
1174 if (runtime->buffer == NULL) {
1175 rmidi_dbg(substream->rmidi,
1176 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1177 return -EINVAL;
1178 }
1179 result = 0;
1180 if (runtime->avail >= runtime->buffer_size) {
1181 /* warning: lowlevel layer MUST trigger down the hardware */
1182 goto __skip;
1183 }
1184 if (count == 1) { /* special case, faster code */
1185 *buffer = runtime->buffer[runtime->hw_ptr];
1186 result++;
1187 } else {
1188 count1 = runtime->buffer_size - runtime->hw_ptr;
1189 if (count1 > count)
1190 count1 = count;
1191 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1192 count1 = runtime->buffer_size - runtime->avail;
1193 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1194 count -= count1;
1195 result += count1;
1196 if (count > 0) {
1197 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1198 count = runtime->buffer_size - runtime->avail - count1;
1199 memcpy(buffer + count1, runtime->buffer, count);
1200 result += count;
1201 }
1202 }
1203 __skip:
1204 return result;
1205}
1206EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1207
1208/**
1209 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1210 * @substream: the rawmidi substream
1211 * @buffer: the buffer pointer
1212 * @count: data size to transfer
1213 *
1214 * Copies data from the internal output buffer to the given buffer.
1215 *
1216 * Call this in the interrupt handler when the midi output is ready,
1217 * and call snd_rawmidi_transmit_ack() after the transmission is
1218 * finished.
1219 *
1220 * Return: The size of copied data, or a negative error code on failure.
1221 */
1222int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1223 unsigned char *buffer, int count)
1224{
1225 struct snd_rawmidi_runtime *runtime = substream->runtime;
1226 int result;
1227 unsigned long flags;
1228
1229 spin_lock_irqsave(&runtime->lock, flags);
1230 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1231 spin_unlock_irqrestore(&runtime->lock, flags);
1232 return result;
1233}
1234EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1235
1236/**
1237 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1238 * @substream: the rawmidi substream
1239 * @count: the transferred count
1240 *
1241 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1242 */
1243int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1244{
1245 struct snd_rawmidi_runtime *runtime = substream->runtime;
1246
1247 if (runtime->buffer == NULL) {
1248 rmidi_dbg(substream->rmidi,
1249 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1250 return -EINVAL;
1251 }
1252 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1253 runtime->hw_ptr += count;
1254 runtime->hw_ptr %= runtime->buffer_size;
1255 runtime->avail += count;
1256 substream->bytes += count;
1257 if (count > 0) {
1258 if (runtime->drain || snd_rawmidi_ready(substream))
1259 wake_up(&runtime->sleep);
1260 }
1261 return count;
1262}
1263EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1264
1265/**
1266 * snd_rawmidi_transmit_ack - acknowledge the transmission
1267 * @substream: the rawmidi substream
1268 * @count: the transferred count
1269 *
1270 * Advances the hardware pointer for the internal output buffer with
1271 * the given size and updates the condition.
1272 * Call after the transmission is finished.
1273 *
1274 * Return: The advanced size if successful, or a negative error code on failure.
1275 */
1276int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1277{
1278 struct snd_rawmidi_runtime *runtime = substream->runtime;
1279 int result;
1280 unsigned long flags;
1281
1282 spin_lock_irqsave(&runtime->lock, flags);
1283 result = __snd_rawmidi_transmit_ack(substream, count);
1284 spin_unlock_irqrestore(&runtime->lock, flags);
1285 return result;
1286}
1287EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1288
1289/**
1290 * snd_rawmidi_transmit - copy from the buffer to the device
1291 * @substream: the rawmidi substream
1292 * @buffer: the buffer pointer
1293 * @count: the data size to transfer
1294 *
1295 * Copies data from the buffer to the device and advances the pointer.
1296 *
1297 * Return: The copied size if successful, or a negative error code on failure.
1298 */
1299int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1300 unsigned char *buffer, int count)
1301{
1302 struct snd_rawmidi_runtime *runtime = substream->runtime;
1303 int result;
1304 unsigned long flags;
1305
1306 spin_lock_irqsave(&runtime->lock, flags);
1307 if (!substream->opened)
1308 result = -EBADFD;
1309 else {
1310 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1311 if (count <= 0)
1312 result = count;
1313 else
1314 result = __snd_rawmidi_transmit_ack(substream, count);
1315 }
1316 spin_unlock_irqrestore(&runtime->lock, flags);
1317 return result;
1318}
1319EXPORT_SYMBOL(snd_rawmidi_transmit);
1320
1321/**
1322 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1323 * @substream: rawmidi substream
1324 *
1325 * Return: the number of discarded bytes
1326 */
1327int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1328{
1329 struct snd_rawmidi_runtime *runtime = substream->runtime;
1330 unsigned long flags;
1331 int count = 0;
1332
1333 spin_lock_irqsave(&runtime->lock, flags);
1334 if (runtime->avail < runtime->buffer_size) {
1335 count = runtime->buffer_size - runtime->avail;
1336 __snd_rawmidi_transmit_ack(substream, count);
1337 }
1338 spin_unlock_irqrestore(&runtime->lock, flags);
1339 return count;
1340}
1341EXPORT_SYMBOL(snd_rawmidi_proceed);
1342
1343static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1344 const unsigned char __user *userbuf,
1345 const unsigned char *kernelbuf,
1346 long count)
1347{
1348 unsigned long flags;
1349 long count1, result;
1350 struct snd_rawmidi_runtime *runtime = substream->runtime;
1351 unsigned long appl_ptr;
1352
1353 if (!kernelbuf && !userbuf)
1354 return -EINVAL;
1355 if (snd_BUG_ON(!runtime->buffer))
1356 return -EINVAL;
1357
1358 result = 0;
1359 spin_lock_irqsave(&runtime->lock, flags);
1360 if (substream->append) {
1361 if ((long)runtime->avail < count) {
1362 spin_unlock_irqrestore(&runtime->lock, flags);
1363 return -EAGAIN;
1364 }
1365 }
1366 snd_rawmidi_buffer_ref(runtime);
1367 while (count > 0 && runtime->avail > 0) {
1368 count1 = runtime->buffer_size - runtime->appl_ptr;
1369 if (count1 > count)
1370 count1 = count;
1371 if (count1 > (long)runtime->avail)
1372 count1 = runtime->avail;
1373
1374 /* update runtime->appl_ptr before unlocking for userbuf */
1375 appl_ptr = runtime->appl_ptr;
1376 runtime->appl_ptr += count1;
1377 runtime->appl_ptr %= runtime->buffer_size;
1378 runtime->avail -= count1;
1379
1380 if (kernelbuf)
1381 memcpy(runtime->buffer + appl_ptr,
1382 kernelbuf + result, count1);
1383 else if (userbuf) {
1384 spin_unlock_irqrestore(&runtime->lock, flags);
1385 if (copy_from_user(runtime->buffer + appl_ptr,
1386 userbuf + result, count1)) {
1387 spin_lock_irqsave(&runtime->lock, flags);
1388 result = result > 0 ? result : -EFAULT;
1389 goto __end;
1390 }
1391 spin_lock_irqsave(&runtime->lock, flags);
1392 }
1393 result += count1;
1394 count -= count1;
1395 }
1396 __end:
1397 count1 = runtime->avail < runtime->buffer_size;
1398 snd_rawmidi_buffer_unref(runtime);
1399 spin_unlock_irqrestore(&runtime->lock, flags);
1400 if (count1)
1401 snd_rawmidi_output_trigger(substream, 1);
1402 return result;
1403}
1404
1405long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1406 const unsigned char *buf, long count)
1407{
1408 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1409}
1410EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1411
1412static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1413 size_t count, loff_t *offset)
1414{
1415 long result, timeout;
1416 int count1;
1417 struct snd_rawmidi_file *rfile;
1418 struct snd_rawmidi_runtime *runtime;
1419 struct snd_rawmidi_substream *substream;
1420
1421 rfile = file->private_data;
1422 substream = rfile->output;
1423 runtime = substream->runtime;
1424 /* we cannot put an atomic message to our buffer */
1425 if (substream->append && count > runtime->buffer_size)
1426 return -EIO;
1427 result = 0;
1428 while (count > 0) {
1429 spin_lock_irq(&runtime->lock);
1430 while (!snd_rawmidi_ready_append(substream, count)) {
1431 wait_queue_entry_t wait;
1432
1433 if (file->f_flags & O_NONBLOCK) {
1434 spin_unlock_irq(&runtime->lock);
1435 return result > 0 ? result : -EAGAIN;
1436 }
1437 init_waitqueue_entry(&wait, current);
1438 add_wait_queue(&runtime->sleep, &wait);
1439 set_current_state(TASK_INTERRUPTIBLE);
1440 spin_unlock_irq(&runtime->lock);
1441 timeout = schedule_timeout(30 * HZ);
1442 remove_wait_queue(&runtime->sleep, &wait);
1443 if (rfile->rmidi->card->shutdown)
1444 return -ENODEV;
1445 if (signal_pending(current))
1446 return result > 0 ? result : -ERESTARTSYS;
1447 if (!runtime->avail && !timeout)
1448 return result > 0 ? result : -EIO;
1449 spin_lock_irq(&runtime->lock);
1450 }
1451 spin_unlock_irq(&runtime->lock);
1452 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1453 if (count1 < 0)
1454 return result > 0 ? result : count1;
1455 result += count1;
1456 buf += count1;
1457 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1458 break;
1459 count -= count1;
1460 }
1461 if (file->f_flags & O_DSYNC) {
1462 spin_lock_irq(&runtime->lock);
1463 while (runtime->avail != runtime->buffer_size) {
1464 wait_queue_entry_t wait;
1465 unsigned int last_avail = runtime->avail;
1466
1467 init_waitqueue_entry(&wait, current);
1468 add_wait_queue(&runtime->sleep, &wait);
1469 set_current_state(TASK_INTERRUPTIBLE);
1470 spin_unlock_irq(&runtime->lock);
1471 timeout = schedule_timeout(30 * HZ);
1472 remove_wait_queue(&runtime->sleep, &wait);
1473 if (signal_pending(current))
1474 return result > 0 ? result : -ERESTARTSYS;
1475 if (runtime->avail == last_avail && !timeout)
1476 return result > 0 ? result : -EIO;
1477 spin_lock_irq(&runtime->lock);
1478 }
1479 spin_unlock_irq(&runtime->lock);
1480 }
1481 return result;
1482}
1483
1484static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1485{
1486 struct snd_rawmidi_file *rfile;
1487 struct snd_rawmidi_runtime *runtime;
1488 __poll_t mask;
1489
1490 rfile = file->private_data;
1491 if (rfile->input != NULL) {
1492 runtime = rfile->input->runtime;
1493 snd_rawmidi_input_trigger(rfile->input, 1);
1494 poll_wait(file, &runtime->sleep, wait);
1495 }
1496 if (rfile->output != NULL) {
1497 runtime = rfile->output->runtime;
1498 poll_wait(file, &runtime->sleep, wait);
1499 }
1500 mask = 0;
1501 if (rfile->input != NULL) {
1502 if (snd_rawmidi_ready(rfile->input))
1503 mask |= EPOLLIN | EPOLLRDNORM;
1504 }
1505 if (rfile->output != NULL) {
1506 if (snd_rawmidi_ready(rfile->output))
1507 mask |= EPOLLOUT | EPOLLWRNORM;
1508 }
1509 return mask;
1510}
1511
1512/*
1513 */
1514#ifdef CONFIG_COMPAT
1515#include "rawmidi_compat.c"
1516#else
1517#define snd_rawmidi_ioctl_compat NULL
1518#endif
1519
1520/*
1521 */
1522
1523static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1524 struct snd_info_buffer *buffer)
1525{
1526 struct snd_rawmidi *rmidi;
1527 struct snd_rawmidi_substream *substream;
1528 struct snd_rawmidi_runtime *runtime;
1529
1530 rmidi = entry->private_data;
1531 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1532 mutex_lock(&rmidi->open_mutex);
1533 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1534 list_for_each_entry(substream,
1535 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1536 list) {
1537 snd_iprintf(buffer,
1538 "Output %d\n"
1539 " Tx bytes : %lu\n",
1540 substream->number,
1541 (unsigned long) substream->bytes);
1542 if (substream->opened) {
1543 snd_iprintf(buffer,
1544 " Owner PID : %d\n",
1545 pid_vnr(substream->pid));
1546 runtime = substream->runtime;
1547 snd_iprintf(buffer,
1548 " Mode : %s\n"
1549 " Buffer size : %lu\n"
1550 " Avail : %lu\n",
1551 runtime->oss ? "OSS compatible" : "native",
1552 (unsigned long) runtime->buffer_size,
1553 (unsigned long) runtime->avail);
1554 }
1555 }
1556 }
1557 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1558 list_for_each_entry(substream,
1559 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1560 list) {
1561 snd_iprintf(buffer,
1562 "Input %d\n"
1563 " Rx bytes : %lu\n",
1564 substream->number,
1565 (unsigned long) substream->bytes);
1566 if (substream->opened) {
1567 snd_iprintf(buffer,
1568 " Owner PID : %d\n",
1569 pid_vnr(substream->pid));
1570 runtime = substream->runtime;
1571 snd_iprintf(buffer,
1572 " Buffer size : %lu\n"
1573 " Avail : %lu\n"
1574 " Overruns : %lu\n",
1575 (unsigned long) runtime->buffer_size,
1576 (unsigned long) runtime->avail,
1577 (unsigned long) runtime->xruns);
1578 }
1579 }
1580 }
1581 mutex_unlock(&rmidi->open_mutex);
1582}
1583
1584/*
1585 * Register functions
1586 */
1587
1588static const struct file_operations snd_rawmidi_f_ops = {
1589 .owner = THIS_MODULE,
1590 .read = snd_rawmidi_read,
1591 .write = snd_rawmidi_write,
1592 .open = snd_rawmidi_open,
1593 .release = snd_rawmidi_release,
1594 .llseek = no_llseek,
1595 .poll = snd_rawmidi_poll,
1596 .unlocked_ioctl = snd_rawmidi_ioctl,
1597 .compat_ioctl = snd_rawmidi_ioctl_compat,
1598};
1599
1600static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1601 struct snd_rawmidi_str *stream,
1602 int direction,
1603 int count)
1604{
1605 struct snd_rawmidi_substream *substream;
1606 int idx;
1607
1608 for (idx = 0; idx < count; idx++) {
1609 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1610 if (!substream)
1611 return -ENOMEM;
1612 substream->stream = direction;
1613 substream->number = idx;
1614 substream->rmidi = rmidi;
1615 substream->pstr = stream;
1616 list_add_tail(&substream->list, &stream->substreams);
1617 stream->substream_count++;
1618 }
1619 return 0;
1620}
1621
1622static void release_rawmidi_device(struct device *dev)
1623{
1624 kfree(container_of(dev, struct snd_rawmidi, dev));
1625}
1626
1627/**
1628 * snd_rawmidi_new - create a rawmidi instance
1629 * @card: the card instance
1630 * @id: the id string
1631 * @device: the device index
1632 * @output_count: the number of output streams
1633 * @input_count: the number of input streams
1634 * @rrawmidi: the pointer to store the new rawmidi instance
1635 *
1636 * Creates a new rawmidi instance.
1637 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1638 *
1639 * Return: Zero if successful, or a negative error code on failure.
1640 */
1641int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1642 int output_count, int input_count,
1643 struct snd_rawmidi **rrawmidi)
1644{
1645 struct snd_rawmidi *rmidi;
1646 int err;
1647 static const struct snd_device_ops ops = {
1648 .dev_free = snd_rawmidi_dev_free,
1649 .dev_register = snd_rawmidi_dev_register,
1650 .dev_disconnect = snd_rawmidi_dev_disconnect,
1651 };
1652
1653 if (snd_BUG_ON(!card))
1654 return -ENXIO;
1655 if (rrawmidi)
1656 *rrawmidi = NULL;
1657 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1658 if (!rmidi)
1659 return -ENOMEM;
1660 rmidi->card = card;
1661 rmidi->device = device;
1662 mutex_init(&rmidi->open_mutex);
1663 init_waitqueue_head(&rmidi->open_wait);
1664 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1665 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1666
1667 if (id != NULL)
1668 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1669
1670 snd_device_initialize(&rmidi->dev, card);
1671 rmidi->dev.release = release_rawmidi_device;
1672 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1673
1674 err = snd_rawmidi_alloc_substreams(rmidi,
1675 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1676 SNDRV_RAWMIDI_STREAM_INPUT,
1677 input_count);
1678 if (err < 0)
1679 goto error;
1680 err = snd_rawmidi_alloc_substreams(rmidi,
1681 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1682 SNDRV_RAWMIDI_STREAM_OUTPUT,
1683 output_count);
1684 if (err < 0)
1685 goto error;
1686 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1687 if (err < 0)
1688 goto error;
1689
1690 if (rrawmidi)
1691 *rrawmidi = rmidi;
1692 return 0;
1693
1694 error:
1695 snd_rawmidi_free(rmidi);
1696 return err;
1697}
1698EXPORT_SYMBOL(snd_rawmidi_new);
1699
1700static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1701{
1702 struct snd_rawmidi_substream *substream;
1703
1704 while (!list_empty(&stream->substreams)) {
1705 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1706 list_del(&substream->list);
1707 kfree(substream);
1708 }
1709}
1710
1711static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1712{
1713 if (!rmidi)
1714 return 0;
1715
1716 snd_info_free_entry(rmidi->proc_entry);
1717 rmidi->proc_entry = NULL;
1718 mutex_lock(®ister_mutex);
1719 if (rmidi->ops && rmidi->ops->dev_unregister)
1720 rmidi->ops->dev_unregister(rmidi);
1721 mutex_unlock(®ister_mutex);
1722
1723 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1724 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1725 if (rmidi->private_free)
1726 rmidi->private_free(rmidi);
1727 put_device(&rmidi->dev);
1728 return 0;
1729}
1730
1731static int snd_rawmidi_dev_free(struct snd_device *device)
1732{
1733 struct snd_rawmidi *rmidi = device->device_data;
1734
1735 return snd_rawmidi_free(rmidi);
1736}
1737
1738#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1739static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1740{
1741 struct snd_rawmidi *rmidi = device->private_data;
1742
1743 rmidi->seq_dev = NULL;
1744}
1745#endif
1746
1747static int snd_rawmidi_dev_register(struct snd_device *device)
1748{
1749 int err;
1750 struct snd_info_entry *entry;
1751 char name[16];
1752 struct snd_rawmidi *rmidi = device->device_data;
1753
1754 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1755 return -ENOMEM;
1756 err = 0;
1757 mutex_lock(®ister_mutex);
1758 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1759 err = -EBUSY;
1760 else
1761 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1762 mutex_unlock(®ister_mutex);
1763 if (err < 0)
1764 return err;
1765
1766 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1767 rmidi->card, rmidi->device,
1768 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1769 if (err < 0) {
1770 rmidi_err(rmidi, "unable to register\n");
1771 goto error;
1772 }
1773 if (rmidi->ops && rmidi->ops->dev_register) {
1774 err = rmidi->ops->dev_register(rmidi);
1775 if (err < 0)
1776 goto error_unregister;
1777 }
1778#ifdef CONFIG_SND_OSSEMUL
1779 rmidi->ossreg = 0;
1780 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1781 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1782 rmidi->card, 0, &snd_rawmidi_f_ops,
1783 rmidi) < 0) {
1784 rmidi_err(rmidi,
1785 "unable to register OSS rawmidi device %i:%i\n",
1786 rmidi->card->number, 0);
1787 } else {
1788 rmidi->ossreg++;
1789#ifdef SNDRV_OSS_INFO_DEV_MIDI
1790 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1791#endif
1792 }
1793 }
1794 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1795 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1796 rmidi->card, 1, &snd_rawmidi_f_ops,
1797 rmidi) < 0) {
1798 rmidi_err(rmidi,
1799 "unable to register OSS rawmidi device %i:%i\n",
1800 rmidi->card->number, 1);
1801 } else {
1802 rmidi->ossreg++;
1803 }
1804 }
1805#endif /* CONFIG_SND_OSSEMUL */
1806 sprintf(name, "midi%d", rmidi->device);
1807 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1808 if (entry) {
1809 entry->private_data = rmidi;
1810 entry->c.text.read = snd_rawmidi_proc_info_read;
1811 if (snd_info_register(entry) < 0) {
1812 snd_info_free_entry(entry);
1813 entry = NULL;
1814 }
1815 }
1816 rmidi->proc_entry = entry;
1817#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1818 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1819 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1820 rmidi->seq_dev->private_data = rmidi;
1821 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1822 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1823 snd_device_register(rmidi->card, rmidi->seq_dev);
1824 }
1825 }
1826#endif
1827 return 0;
1828
1829 error_unregister:
1830 snd_unregister_device(&rmidi->dev);
1831 error:
1832 mutex_lock(®ister_mutex);
1833 list_del(&rmidi->list);
1834 mutex_unlock(®ister_mutex);
1835 return err;
1836}
1837
1838static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1839{
1840 struct snd_rawmidi *rmidi = device->device_data;
1841 int dir;
1842
1843 mutex_lock(®ister_mutex);
1844 mutex_lock(&rmidi->open_mutex);
1845 wake_up(&rmidi->open_wait);
1846 list_del_init(&rmidi->list);
1847 for (dir = 0; dir < 2; dir++) {
1848 struct snd_rawmidi_substream *s;
1849
1850 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1851 if (s->runtime)
1852 wake_up(&s->runtime->sleep);
1853 }
1854 }
1855
1856#ifdef CONFIG_SND_OSSEMUL
1857 if (rmidi->ossreg) {
1858 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1859 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1860#ifdef SNDRV_OSS_INFO_DEV_MIDI
1861 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1862#endif
1863 }
1864 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1865 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1866 rmidi->ossreg = 0;
1867 }
1868#endif /* CONFIG_SND_OSSEMUL */
1869 snd_unregister_device(&rmidi->dev);
1870 mutex_unlock(&rmidi->open_mutex);
1871 mutex_unlock(®ister_mutex);
1872 return 0;
1873}
1874
1875/**
1876 * snd_rawmidi_set_ops - set the rawmidi operators
1877 * @rmidi: the rawmidi instance
1878 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1879 * @ops: the operator table
1880 *
1881 * Sets the rawmidi operators for the given stream direction.
1882 */
1883void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1884 const struct snd_rawmidi_ops *ops)
1885{
1886 struct snd_rawmidi_substream *substream;
1887
1888 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1889 substream->ops = ops;
1890}
1891EXPORT_SYMBOL(snd_rawmidi_set_ops);
1892
1893/*
1894 * ENTRY functions
1895 */
1896
1897static int __init alsa_rawmidi_init(void)
1898{
1899
1900 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1901 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1902#ifdef CONFIG_SND_OSSEMUL
1903 { int i;
1904 /* check device map table */
1905 for (i = 0; i < SNDRV_CARDS; i++) {
1906 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1907 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1908 i, midi_map[i]);
1909 midi_map[i] = 0;
1910 }
1911 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1912 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1913 i, amidi_map[i]);
1914 amidi_map[i] = 1;
1915 }
1916 }
1917 }
1918#endif /* CONFIG_SND_OSSEMUL */
1919 return 0;
1920}
1921
1922static void __exit alsa_rawmidi_exit(void)
1923{
1924 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1925 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1926}
1927
1928module_init(alsa_rawmidi_init)
1929module_exit(alsa_rawmidi_exit)
1/*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <sound/core.h>
23#include <linux/major.h>
24#include <linux/init.h>
25#include <linux/sched.h>
26#include <linux/slab.h>
27#include <linux/time.h>
28#include <linux/wait.h>
29#include <linux/mutex.h>
30#include <linux/module.h>
31#include <linux/delay.h>
32#include <sound/rawmidi.h>
33#include <sound/info.h>
34#include <sound/control.h>
35#include <sound/minors.h>
36#include <sound/initval.h>
37
38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40MODULE_LICENSE("GPL");
41
42#ifdef CONFIG_SND_OSSEMUL
43static int midi_map[SNDRV_CARDS];
44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45module_param_array(midi_map, int, NULL, 0444);
46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47module_param_array(amidi_map, int, NULL, 0444);
48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49#endif /* CONFIG_SND_OSSEMUL */
50
51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52static int snd_rawmidi_dev_free(struct snd_device *device);
53static int snd_rawmidi_dev_register(struct snd_device *device);
54static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56static LIST_HEAD(snd_rawmidi_devices);
57static DEFINE_MUTEX(register_mutex);
58
59#define rmidi_err(rmidi, fmt, args...) \
60 dev_err(&(rmidi)->dev, fmt, ##args)
61#define rmidi_warn(rmidi, fmt, args...) \
62 dev_warn(&(rmidi)->dev, fmt, ##args)
63#define rmidi_dbg(rmidi, fmt, args...) \
64 dev_dbg(&(rmidi)->dev, fmt, ##args)
65
66static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
67{
68 struct snd_rawmidi *rawmidi;
69
70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
71 if (rawmidi->card == card && rawmidi->device == device)
72 return rawmidi;
73 return NULL;
74}
75
76static inline unsigned short snd_rawmidi_file_flags(struct file *file)
77{
78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
79 case FMODE_WRITE:
80 return SNDRV_RAWMIDI_LFLG_OUTPUT;
81 case FMODE_READ:
82 return SNDRV_RAWMIDI_LFLG_INPUT;
83 default:
84 return SNDRV_RAWMIDI_LFLG_OPEN;
85 }
86}
87
88static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
89{
90 struct snd_rawmidi_runtime *runtime = substream->runtime;
91 return runtime->avail >= runtime->avail_min;
92}
93
94static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
95 size_t count)
96{
97 struct snd_rawmidi_runtime *runtime = substream->runtime;
98 return runtime->avail >= runtime->avail_min &&
99 (!substream->append || runtime->avail >= count);
100}
101
102static void snd_rawmidi_input_event_work(struct work_struct *work)
103{
104 struct snd_rawmidi_runtime *runtime =
105 container_of(work, struct snd_rawmidi_runtime, event_work);
106 if (runtime->event)
107 runtime->event(runtime->substream);
108}
109
110static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
111{
112 struct snd_rawmidi_runtime *runtime;
113
114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
115 return -ENOMEM;
116 runtime->substream = substream;
117 spin_lock_init(&runtime->lock);
118 init_waitqueue_head(&runtime->sleep);
119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
120 runtime->event = NULL;
121 runtime->buffer_size = PAGE_SIZE;
122 runtime->avail_min = 1;
123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
124 runtime->avail = 0;
125 else
126 runtime->avail = runtime->buffer_size;
127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
128 kfree(runtime);
129 return -ENOMEM;
130 }
131 runtime->appl_ptr = runtime->hw_ptr = 0;
132 substream->runtime = runtime;
133 return 0;
134}
135
136static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
137{
138 struct snd_rawmidi_runtime *runtime = substream->runtime;
139
140 kfree(runtime->buffer);
141 kfree(runtime);
142 substream->runtime = NULL;
143 return 0;
144}
145
146static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
147{
148 if (!substream->opened)
149 return;
150 substream->ops->trigger(substream, up);
151}
152
153static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154{
155 if (!substream->opened)
156 return;
157 substream->ops->trigger(substream, up);
158 if (!up)
159 cancel_work_sync(&substream->runtime->event_work);
160}
161
162int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
163{
164 unsigned long flags;
165 struct snd_rawmidi_runtime *runtime = substream->runtime;
166
167 snd_rawmidi_output_trigger(substream, 0);
168 runtime->drain = 0;
169 spin_lock_irqsave(&runtime->lock, flags);
170 runtime->appl_ptr = runtime->hw_ptr = 0;
171 runtime->avail = runtime->buffer_size;
172 spin_unlock_irqrestore(&runtime->lock, flags);
173 return 0;
174}
175EXPORT_SYMBOL(snd_rawmidi_drop_output);
176
177int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
178{
179 int err;
180 long timeout;
181 struct snd_rawmidi_runtime *runtime = substream->runtime;
182
183 err = 0;
184 runtime->drain = 1;
185 timeout = wait_event_interruptible_timeout(runtime->sleep,
186 (runtime->avail >= runtime->buffer_size),
187 10*HZ);
188 if (signal_pending(current))
189 err = -ERESTARTSYS;
190 if (runtime->avail < runtime->buffer_size && !timeout) {
191 rmidi_warn(substream->rmidi,
192 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
193 (long)runtime->avail, (long)runtime->buffer_size);
194 err = -EIO;
195 }
196 runtime->drain = 0;
197 if (err != -ERESTARTSYS) {
198 /* we need wait a while to make sure that Tx FIFOs are empty */
199 if (substream->ops->drain)
200 substream->ops->drain(substream);
201 else
202 msleep(50);
203 snd_rawmidi_drop_output(substream);
204 }
205 return err;
206}
207EXPORT_SYMBOL(snd_rawmidi_drain_output);
208
209int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210{
211 unsigned long flags;
212 struct snd_rawmidi_runtime *runtime = substream->runtime;
213
214 snd_rawmidi_input_trigger(substream, 0);
215 runtime->drain = 0;
216 spin_lock_irqsave(&runtime->lock, flags);
217 runtime->appl_ptr = runtime->hw_ptr = 0;
218 runtime->avail = 0;
219 spin_unlock_irqrestore(&runtime->lock, flags);
220 return 0;
221}
222EXPORT_SYMBOL(snd_rawmidi_drain_input);
223
224/* look for an available substream for the given stream direction;
225 * if a specific subdevice is given, try to assign it
226 */
227static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
228 int stream, int mode,
229 struct snd_rawmidi_substream **sub_ret)
230{
231 struct snd_rawmidi_substream *substream;
232 struct snd_rawmidi_str *s = &rmidi->streams[stream];
233 static unsigned int info_flags[2] = {
234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
236 };
237
238 if (!(rmidi->info_flags & info_flags[stream]))
239 return -ENXIO;
240 if (subdevice >= 0 && subdevice >= s->substream_count)
241 return -ENODEV;
242
243 list_for_each_entry(substream, &s->substreams, list) {
244 if (substream->opened) {
245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
247 !substream->append)
248 continue;
249 }
250 if (subdevice < 0 || subdevice == substream->number) {
251 *sub_ret = substream;
252 return 0;
253 }
254 }
255 return -EAGAIN;
256}
257
258/* open and do ref-counting for the given substream */
259static int open_substream(struct snd_rawmidi *rmidi,
260 struct snd_rawmidi_substream *substream,
261 int mode)
262{
263 int err;
264
265 if (substream->use_count == 0) {
266 err = snd_rawmidi_runtime_create(substream);
267 if (err < 0)
268 return err;
269 err = substream->ops->open(substream);
270 if (err < 0) {
271 snd_rawmidi_runtime_free(substream);
272 return err;
273 }
274 substream->opened = 1;
275 substream->active_sensing = 0;
276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
277 substream->append = 1;
278 substream->pid = get_pid(task_pid(current));
279 rmidi->streams[substream->stream].substream_opened++;
280 }
281 substream->use_count++;
282 return 0;
283}
284
285static void close_substream(struct snd_rawmidi *rmidi,
286 struct snd_rawmidi_substream *substream,
287 int cleanup);
288
289static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
290 struct snd_rawmidi_file *rfile)
291{
292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
293 int err;
294
295 rfile->input = rfile->output = NULL;
296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
297 err = assign_substream(rmidi, subdevice,
298 SNDRV_RAWMIDI_STREAM_INPUT,
299 mode, &sinput);
300 if (err < 0)
301 return err;
302 }
303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
304 err = assign_substream(rmidi, subdevice,
305 SNDRV_RAWMIDI_STREAM_OUTPUT,
306 mode, &soutput);
307 if (err < 0)
308 return err;
309 }
310
311 if (sinput) {
312 err = open_substream(rmidi, sinput, mode);
313 if (err < 0)
314 return err;
315 }
316 if (soutput) {
317 err = open_substream(rmidi, soutput, mode);
318 if (err < 0) {
319 if (sinput)
320 close_substream(rmidi, sinput, 0);
321 return err;
322 }
323 }
324
325 rfile->rmidi = rmidi;
326 rfile->input = sinput;
327 rfile->output = soutput;
328 return 0;
329}
330
331/* called from sound/core/seq/seq_midi.c */
332int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
333 int mode, struct snd_rawmidi_file * rfile)
334{
335 struct snd_rawmidi *rmidi;
336 int err;
337
338 if (snd_BUG_ON(!rfile))
339 return -EINVAL;
340
341 mutex_lock(®ister_mutex);
342 rmidi = snd_rawmidi_search(card, device);
343 if (rmidi == NULL) {
344 mutex_unlock(®ister_mutex);
345 return -ENODEV;
346 }
347 if (!try_module_get(rmidi->card->module)) {
348 mutex_unlock(®ister_mutex);
349 return -ENXIO;
350 }
351 mutex_unlock(®ister_mutex);
352
353 mutex_lock(&rmidi->open_mutex);
354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
355 mutex_unlock(&rmidi->open_mutex);
356 if (err < 0)
357 module_put(rmidi->card->module);
358 return err;
359}
360EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361
362static int snd_rawmidi_open(struct inode *inode, struct file *file)
363{
364 int maj = imajor(inode);
365 struct snd_card *card;
366 int subdevice;
367 unsigned short fflags;
368 int err;
369 struct snd_rawmidi *rmidi;
370 struct snd_rawmidi_file *rawmidi_file = NULL;
371 wait_queue_t wait;
372
373 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
374 return -EINVAL; /* invalid combination */
375
376 err = nonseekable_open(inode, file);
377 if (err < 0)
378 return err;
379
380 if (maj == snd_major) {
381 rmidi = snd_lookup_minor_data(iminor(inode),
382 SNDRV_DEVICE_TYPE_RAWMIDI);
383#ifdef CONFIG_SND_OSSEMUL
384 } else if (maj == SOUND_MAJOR) {
385 rmidi = snd_lookup_oss_minor_data(iminor(inode),
386 SNDRV_OSS_DEVICE_TYPE_MIDI);
387#endif
388 } else
389 return -ENXIO;
390
391 if (rmidi == NULL)
392 return -ENODEV;
393
394 if (!try_module_get(rmidi->card->module)) {
395 snd_card_unref(rmidi->card);
396 return -ENXIO;
397 }
398
399 mutex_lock(&rmidi->open_mutex);
400 card = rmidi->card;
401 err = snd_card_file_add(card, file);
402 if (err < 0)
403 goto __error_card;
404 fflags = snd_rawmidi_file_flags(file);
405 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
406 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
407 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
408 if (rawmidi_file == NULL) {
409 err = -ENOMEM;
410 goto __error;
411 }
412 init_waitqueue_entry(&wait, current);
413 add_wait_queue(&rmidi->open_wait, &wait);
414 while (1) {
415 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
416 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
417 if (err >= 0)
418 break;
419 if (err == -EAGAIN) {
420 if (file->f_flags & O_NONBLOCK) {
421 err = -EBUSY;
422 break;
423 }
424 } else
425 break;
426 set_current_state(TASK_INTERRUPTIBLE);
427 mutex_unlock(&rmidi->open_mutex);
428 schedule();
429 mutex_lock(&rmidi->open_mutex);
430 if (rmidi->card->shutdown) {
431 err = -ENODEV;
432 break;
433 }
434 if (signal_pending(current)) {
435 err = -ERESTARTSYS;
436 break;
437 }
438 }
439 remove_wait_queue(&rmidi->open_wait, &wait);
440 if (err < 0) {
441 kfree(rawmidi_file);
442 goto __error;
443 }
444#ifdef CONFIG_SND_OSSEMUL
445 if (rawmidi_file->input && rawmidi_file->input->runtime)
446 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
447 if (rawmidi_file->output && rawmidi_file->output->runtime)
448 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
449#endif
450 file->private_data = rawmidi_file;
451 mutex_unlock(&rmidi->open_mutex);
452 snd_card_unref(rmidi->card);
453 return 0;
454
455 __error:
456 snd_card_file_remove(card, file);
457 __error_card:
458 mutex_unlock(&rmidi->open_mutex);
459 module_put(rmidi->card->module);
460 snd_card_unref(rmidi->card);
461 return err;
462}
463
464static void close_substream(struct snd_rawmidi *rmidi,
465 struct snd_rawmidi_substream *substream,
466 int cleanup)
467{
468 if (--substream->use_count)
469 return;
470
471 if (cleanup) {
472 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
473 snd_rawmidi_input_trigger(substream, 0);
474 else {
475 if (substream->active_sensing) {
476 unsigned char buf = 0xfe;
477 /* sending single active sensing message
478 * to shut the device up
479 */
480 snd_rawmidi_kernel_write(substream, &buf, 1);
481 }
482 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
483 snd_rawmidi_output_trigger(substream, 0);
484 }
485 }
486 substream->ops->close(substream);
487 if (substream->runtime->private_free)
488 substream->runtime->private_free(substream);
489 snd_rawmidi_runtime_free(substream);
490 substream->opened = 0;
491 substream->append = 0;
492 put_pid(substream->pid);
493 substream->pid = NULL;
494 rmidi->streams[substream->stream].substream_opened--;
495}
496
497static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
498{
499 struct snd_rawmidi *rmidi;
500
501 rmidi = rfile->rmidi;
502 mutex_lock(&rmidi->open_mutex);
503 if (rfile->input) {
504 close_substream(rmidi, rfile->input, 1);
505 rfile->input = NULL;
506 }
507 if (rfile->output) {
508 close_substream(rmidi, rfile->output, 1);
509 rfile->output = NULL;
510 }
511 rfile->rmidi = NULL;
512 mutex_unlock(&rmidi->open_mutex);
513 wake_up(&rmidi->open_wait);
514}
515
516/* called from sound/core/seq/seq_midi.c */
517int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
518{
519 struct snd_rawmidi *rmidi;
520
521 if (snd_BUG_ON(!rfile))
522 return -ENXIO;
523
524 rmidi = rfile->rmidi;
525 rawmidi_release_priv(rfile);
526 module_put(rmidi->card->module);
527 return 0;
528}
529EXPORT_SYMBOL(snd_rawmidi_kernel_release);
530
531static int snd_rawmidi_release(struct inode *inode, struct file *file)
532{
533 struct snd_rawmidi_file *rfile;
534 struct snd_rawmidi *rmidi;
535 struct module *module;
536
537 rfile = file->private_data;
538 rmidi = rfile->rmidi;
539 rawmidi_release_priv(rfile);
540 kfree(rfile);
541 module = rmidi->card->module;
542 snd_card_file_remove(rmidi->card, file);
543 module_put(module);
544 return 0;
545}
546
547static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
548 struct snd_rawmidi_info *info)
549{
550 struct snd_rawmidi *rmidi;
551
552 if (substream == NULL)
553 return -ENODEV;
554 rmidi = substream->rmidi;
555 memset(info, 0, sizeof(*info));
556 info->card = rmidi->card->number;
557 info->device = rmidi->device;
558 info->subdevice = substream->number;
559 info->stream = substream->stream;
560 info->flags = rmidi->info_flags;
561 strcpy(info->id, rmidi->id);
562 strcpy(info->name, rmidi->name);
563 strcpy(info->subname, substream->name);
564 info->subdevices_count = substream->pstr->substream_count;
565 info->subdevices_avail = (substream->pstr->substream_count -
566 substream->pstr->substream_opened);
567 return 0;
568}
569
570static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
571 struct snd_rawmidi_info __user * _info)
572{
573 struct snd_rawmidi_info info;
574 int err;
575 if ((err = snd_rawmidi_info(substream, &info)) < 0)
576 return err;
577 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
578 return -EFAULT;
579 return 0;
580}
581
582int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
583{
584 struct snd_rawmidi *rmidi;
585 struct snd_rawmidi_str *pstr;
586 struct snd_rawmidi_substream *substream;
587
588 mutex_lock(®ister_mutex);
589 rmidi = snd_rawmidi_search(card, info->device);
590 mutex_unlock(®ister_mutex);
591 if (!rmidi)
592 return -ENXIO;
593 if (info->stream < 0 || info->stream > 1)
594 return -EINVAL;
595 pstr = &rmidi->streams[info->stream];
596 if (pstr->substream_count == 0)
597 return -ENOENT;
598 if (info->subdevice >= pstr->substream_count)
599 return -ENXIO;
600 list_for_each_entry(substream, &pstr->substreams, list) {
601 if ((unsigned int)substream->number == info->subdevice)
602 return snd_rawmidi_info(substream, info);
603 }
604 return -ENXIO;
605}
606EXPORT_SYMBOL(snd_rawmidi_info_select);
607
608static int snd_rawmidi_info_select_user(struct snd_card *card,
609 struct snd_rawmidi_info __user *_info)
610{
611 int err;
612 struct snd_rawmidi_info info;
613 if (get_user(info.device, &_info->device))
614 return -EFAULT;
615 if (get_user(info.stream, &_info->stream))
616 return -EFAULT;
617 if (get_user(info.subdevice, &_info->subdevice))
618 return -EFAULT;
619 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
620 return err;
621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
622 return -EFAULT;
623 return 0;
624}
625
626int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
627 struct snd_rawmidi_params * params)
628{
629 char *newbuf;
630 struct snd_rawmidi_runtime *runtime = substream->runtime;
631
632 if (substream->append && substream->use_count > 1)
633 return -EBUSY;
634 snd_rawmidi_drain_output(substream);
635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
636 return -EINVAL;
637 }
638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
639 return -EINVAL;
640 }
641 if (params->buffer_size != runtime->buffer_size) {
642 newbuf = krealloc(runtime->buffer, params->buffer_size,
643 GFP_KERNEL);
644 if (!newbuf)
645 return -ENOMEM;
646 runtime->buffer = newbuf;
647 runtime->buffer_size = params->buffer_size;
648 runtime->avail = runtime->buffer_size;
649 }
650 runtime->avail_min = params->avail_min;
651 substream->active_sensing = !params->no_active_sensing;
652 return 0;
653}
654EXPORT_SYMBOL(snd_rawmidi_output_params);
655
656int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
657 struct snd_rawmidi_params * params)
658{
659 char *newbuf;
660 struct snd_rawmidi_runtime *runtime = substream->runtime;
661
662 snd_rawmidi_drain_input(substream);
663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
664 return -EINVAL;
665 }
666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
667 return -EINVAL;
668 }
669 if (params->buffer_size != runtime->buffer_size) {
670 newbuf = krealloc(runtime->buffer, params->buffer_size,
671 GFP_KERNEL);
672 if (!newbuf)
673 return -ENOMEM;
674 runtime->buffer = newbuf;
675 runtime->buffer_size = params->buffer_size;
676 }
677 runtime->avail_min = params->avail_min;
678 return 0;
679}
680EXPORT_SYMBOL(snd_rawmidi_input_params);
681
682static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683 struct snd_rawmidi_status * status)
684{
685 struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687 memset(status, 0, sizeof(*status));
688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689 spin_lock_irq(&runtime->lock);
690 status->avail = runtime->avail;
691 spin_unlock_irq(&runtime->lock);
692 return 0;
693}
694
695static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696 struct snd_rawmidi_status * status)
697{
698 struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700 memset(status, 0, sizeof(*status));
701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702 spin_lock_irq(&runtime->lock);
703 status->avail = runtime->avail;
704 status->xruns = runtime->xruns;
705 runtime->xruns = 0;
706 spin_unlock_irq(&runtime->lock);
707 return 0;
708}
709
710static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711{
712 struct snd_rawmidi_file *rfile;
713 void __user *argp = (void __user *)arg;
714
715 rfile = file->private_data;
716 if (((cmd >> 8) & 0xff) != 'W')
717 return -ENOTTY;
718 switch (cmd) {
719 case SNDRV_RAWMIDI_IOCTL_PVERSION:
720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721 case SNDRV_RAWMIDI_IOCTL_INFO:
722 {
723 int stream;
724 struct snd_rawmidi_info __user *info = argp;
725 if (get_user(stream, &info->stream))
726 return -EFAULT;
727 switch (stream) {
728 case SNDRV_RAWMIDI_STREAM_INPUT:
729 return snd_rawmidi_info_user(rfile->input, info);
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 return snd_rawmidi_info_user(rfile->output, info);
732 default:
733 return -EINVAL;
734 }
735 }
736 case SNDRV_RAWMIDI_IOCTL_PARAMS:
737 {
738 struct snd_rawmidi_params params;
739 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
740 return -EFAULT;
741 switch (params.stream) {
742 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743 if (rfile->output == NULL)
744 return -EINVAL;
745 return snd_rawmidi_output_params(rfile->output, ¶ms);
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 return snd_rawmidi_input_params(rfile->input, ¶ms);
750 default:
751 return -EINVAL;
752 }
753 }
754 case SNDRV_RAWMIDI_IOCTL_STATUS:
755 {
756 int err = 0;
757 struct snd_rawmidi_status status;
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759 return -EFAULT;
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
763 return -EINVAL;
764 err = snd_rawmidi_output_status(rfile->output, &status);
765 break;
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
768 return -EINVAL;
769 err = snd_rawmidi_input_status(rfile->input, &status);
770 break;
771 default:
772 return -EINVAL;
773 }
774 if (err < 0)
775 return err;
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777 return -EFAULT;
778 return 0;
779 }
780 case SNDRV_RAWMIDI_IOCTL_DROP:
781 {
782 int val;
783 if (get_user(val, (int __user *) argp))
784 return -EFAULT;
785 switch (val) {
786 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787 if (rfile->output == NULL)
788 return -EINVAL;
789 return snd_rawmidi_drop_output(rfile->output);
790 default:
791 return -EINVAL;
792 }
793 }
794 case SNDRV_RAWMIDI_IOCTL_DRAIN:
795 {
796 int val;
797 if (get_user(val, (int __user *) argp))
798 return -EFAULT;
799 switch (val) {
800 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801 if (rfile->output == NULL)
802 return -EINVAL;
803 return snd_rawmidi_drain_output(rfile->output);
804 case SNDRV_RAWMIDI_STREAM_INPUT:
805 if (rfile->input == NULL)
806 return -EINVAL;
807 return snd_rawmidi_drain_input(rfile->input);
808 default:
809 return -EINVAL;
810 }
811 }
812 default:
813 rmidi_dbg(rfile->rmidi,
814 "rawmidi: unknown command = 0x%x\n", cmd);
815 }
816 return -ENOTTY;
817}
818
819static int snd_rawmidi_control_ioctl(struct snd_card *card,
820 struct snd_ctl_file *control,
821 unsigned int cmd,
822 unsigned long arg)
823{
824 void __user *argp = (void __user *)arg;
825
826 switch (cmd) {
827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
828 {
829 int device;
830
831 if (get_user(device, (int __user *)argp))
832 return -EFAULT;
833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
834 device = SNDRV_RAWMIDI_DEVICES - 1;
835 mutex_lock(®ister_mutex);
836 device = device < 0 ? 0 : device + 1;
837 while (device < SNDRV_RAWMIDI_DEVICES) {
838 if (snd_rawmidi_search(card, device))
839 break;
840 device++;
841 }
842 if (device == SNDRV_RAWMIDI_DEVICES)
843 device = -1;
844 mutex_unlock(®ister_mutex);
845 if (put_user(device, (int __user *)argp))
846 return -EFAULT;
847 return 0;
848 }
849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
850 {
851 int val;
852
853 if (get_user(val, (int __user *)argp))
854 return -EFAULT;
855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
856 return 0;
857 }
858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
859 return snd_rawmidi_info_select_user(card, argp);
860 }
861 return -ENOIOCTLCMD;
862}
863
864/**
865 * snd_rawmidi_receive - receive the input data from the device
866 * @substream: the rawmidi substream
867 * @buffer: the buffer pointer
868 * @count: the data size to read
869 *
870 * Reads the data from the internal buffer.
871 *
872 * Return: The size of read data, or a negative error code on failure.
873 */
874int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
875 const unsigned char *buffer, int count)
876{
877 unsigned long flags;
878 int result = 0, count1;
879 struct snd_rawmidi_runtime *runtime = substream->runtime;
880
881 if (!substream->opened)
882 return -EBADFD;
883 if (runtime->buffer == NULL) {
884 rmidi_dbg(substream->rmidi,
885 "snd_rawmidi_receive: input is not active!!!\n");
886 return -EINVAL;
887 }
888 spin_lock_irqsave(&runtime->lock, flags);
889 if (count == 1) { /* special case, faster code */
890 substream->bytes++;
891 if (runtime->avail < runtime->buffer_size) {
892 runtime->buffer[runtime->hw_ptr++] = buffer[0];
893 runtime->hw_ptr %= runtime->buffer_size;
894 runtime->avail++;
895 result++;
896 } else {
897 runtime->xruns++;
898 }
899 } else {
900 substream->bytes += count;
901 count1 = runtime->buffer_size - runtime->hw_ptr;
902 if (count1 > count)
903 count1 = count;
904 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905 count1 = runtime->buffer_size - runtime->avail;
906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907 runtime->hw_ptr += count1;
908 runtime->hw_ptr %= runtime->buffer_size;
909 runtime->avail += count1;
910 count -= count1;
911 result += count1;
912 if (count > 0) {
913 buffer += count1;
914 count1 = count;
915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916 count1 = runtime->buffer_size - runtime->avail;
917 runtime->xruns += count - count1;
918 }
919 if (count1 > 0) {
920 memcpy(runtime->buffer, buffer, count1);
921 runtime->hw_ptr = count1;
922 runtime->avail += count1;
923 result += count1;
924 }
925 }
926 }
927 if (result > 0) {
928 if (runtime->event)
929 schedule_work(&runtime->event_work);
930 else if (snd_rawmidi_ready(substream))
931 wake_up(&runtime->sleep);
932 }
933 spin_unlock_irqrestore(&runtime->lock, flags);
934 return result;
935}
936EXPORT_SYMBOL(snd_rawmidi_receive);
937
938static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
939 unsigned char __user *userbuf,
940 unsigned char *kernelbuf, long count)
941{
942 unsigned long flags;
943 long result = 0, count1;
944 struct snd_rawmidi_runtime *runtime = substream->runtime;
945 unsigned long appl_ptr;
946
947 spin_lock_irqsave(&runtime->lock, flags);
948 while (count > 0 && runtime->avail) {
949 count1 = runtime->buffer_size - runtime->appl_ptr;
950 if (count1 > count)
951 count1 = count;
952 if (count1 > (int)runtime->avail)
953 count1 = runtime->avail;
954
955 /* update runtime->appl_ptr before unlocking for userbuf */
956 appl_ptr = runtime->appl_ptr;
957 runtime->appl_ptr += count1;
958 runtime->appl_ptr %= runtime->buffer_size;
959 runtime->avail -= count1;
960
961 if (kernelbuf)
962 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
963 if (userbuf) {
964 spin_unlock_irqrestore(&runtime->lock, flags);
965 if (copy_to_user(userbuf + result,
966 runtime->buffer + appl_ptr, count1)) {
967 return result > 0 ? result : -EFAULT;
968 }
969 spin_lock_irqsave(&runtime->lock, flags);
970 }
971 result += count1;
972 count -= count1;
973 }
974 spin_unlock_irqrestore(&runtime->lock, flags);
975 return result;
976}
977
978long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
979 unsigned char *buf, long count)
980{
981 snd_rawmidi_input_trigger(substream, 1);
982 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
983}
984EXPORT_SYMBOL(snd_rawmidi_kernel_read);
985
986static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
987 loff_t *offset)
988{
989 long result;
990 int count1;
991 struct snd_rawmidi_file *rfile;
992 struct snd_rawmidi_substream *substream;
993 struct snd_rawmidi_runtime *runtime;
994
995 rfile = file->private_data;
996 substream = rfile->input;
997 if (substream == NULL)
998 return -EIO;
999 runtime = substream->runtime;
1000 snd_rawmidi_input_trigger(substream, 1);
1001 result = 0;
1002 while (count > 0) {
1003 spin_lock_irq(&runtime->lock);
1004 while (!snd_rawmidi_ready(substream)) {
1005 wait_queue_t wait;
1006 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1007 spin_unlock_irq(&runtime->lock);
1008 return result > 0 ? result : -EAGAIN;
1009 }
1010 init_waitqueue_entry(&wait, current);
1011 add_wait_queue(&runtime->sleep, &wait);
1012 set_current_state(TASK_INTERRUPTIBLE);
1013 spin_unlock_irq(&runtime->lock);
1014 schedule();
1015 remove_wait_queue(&runtime->sleep, &wait);
1016 if (rfile->rmidi->card->shutdown)
1017 return -ENODEV;
1018 if (signal_pending(current))
1019 return result > 0 ? result : -ERESTARTSYS;
1020 if (!runtime->avail)
1021 return result > 0 ? result : -EIO;
1022 spin_lock_irq(&runtime->lock);
1023 }
1024 spin_unlock_irq(&runtime->lock);
1025 count1 = snd_rawmidi_kernel_read1(substream,
1026 (unsigned char __user *)buf,
1027 NULL/*kernelbuf*/,
1028 count);
1029 if (count1 < 0)
1030 return result > 0 ? result : count1;
1031 result += count1;
1032 buf += count1;
1033 count -= count1;
1034 }
1035 return result;
1036}
1037
1038/**
1039 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1040 * @substream: the rawmidi substream
1041 *
1042 * Return: 1 if the internal output buffer is empty, 0 if not.
1043 */
1044int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1045{
1046 struct snd_rawmidi_runtime *runtime = substream->runtime;
1047 int result;
1048 unsigned long flags;
1049
1050 if (runtime->buffer == NULL) {
1051 rmidi_dbg(substream->rmidi,
1052 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1053 return 1;
1054 }
1055 spin_lock_irqsave(&runtime->lock, flags);
1056 result = runtime->avail >= runtime->buffer_size;
1057 spin_unlock_irqrestore(&runtime->lock, flags);
1058 return result;
1059}
1060EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1061
1062/**
1063 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1064 * @substream: the rawmidi substream
1065 * @buffer: the buffer pointer
1066 * @count: data size to transfer
1067 *
1068 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1069 */
1070int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071 unsigned char *buffer, int count)
1072{
1073 int result, count1;
1074 struct snd_rawmidi_runtime *runtime = substream->runtime;
1075
1076 if (runtime->buffer == NULL) {
1077 rmidi_dbg(substream->rmidi,
1078 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1079 return -EINVAL;
1080 }
1081 result = 0;
1082 if (runtime->avail >= runtime->buffer_size) {
1083 /* warning: lowlevel layer MUST trigger down the hardware */
1084 goto __skip;
1085 }
1086 if (count == 1) { /* special case, faster code */
1087 *buffer = runtime->buffer[runtime->hw_ptr];
1088 result++;
1089 } else {
1090 count1 = runtime->buffer_size - runtime->hw_ptr;
1091 if (count1 > count)
1092 count1 = count;
1093 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1094 count1 = runtime->buffer_size - runtime->avail;
1095 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1096 count -= count1;
1097 result += count1;
1098 if (count > 0) {
1099 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1100 count = runtime->buffer_size - runtime->avail - count1;
1101 memcpy(buffer + count1, runtime->buffer, count);
1102 result += count;
1103 }
1104 }
1105 __skip:
1106 return result;
1107}
1108EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1109
1110/**
1111 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1112 * @substream: the rawmidi substream
1113 * @buffer: the buffer pointer
1114 * @count: data size to transfer
1115 *
1116 * Copies data from the internal output buffer to the given buffer.
1117 *
1118 * Call this in the interrupt handler when the midi output is ready,
1119 * and call snd_rawmidi_transmit_ack() after the transmission is
1120 * finished.
1121 *
1122 * Return: The size of copied data, or a negative error code on failure.
1123 */
1124int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1125 unsigned char *buffer, int count)
1126{
1127 struct snd_rawmidi_runtime *runtime = substream->runtime;
1128 int result;
1129 unsigned long flags;
1130
1131 spin_lock_irqsave(&runtime->lock, flags);
1132 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1133 spin_unlock_irqrestore(&runtime->lock, flags);
1134 return result;
1135}
1136EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1137
1138/**
1139 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1140 * @substream: the rawmidi substream
1141 * @count: the transferred count
1142 *
1143 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1144 */
1145int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1146{
1147 struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149 if (runtime->buffer == NULL) {
1150 rmidi_dbg(substream->rmidi,
1151 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1152 return -EINVAL;
1153 }
1154 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1155 runtime->hw_ptr += count;
1156 runtime->hw_ptr %= runtime->buffer_size;
1157 runtime->avail += count;
1158 substream->bytes += count;
1159 if (count > 0) {
1160 if (runtime->drain || snd_rawmidi_ready(substream))
1161 wake_up(&runtime->sleep);
1162 }
1163 return count;
1164}
1165EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1166
1167/**
1168 * snd_rawmidi_transmit_ack - acknowledge the transmission
1169 * @substream: the rawmidi substream
1170 * @count: the transferred count
1171 *
1172 * Advances the hardware pointer for the internal output buffer with
1173 * the given size and updates the condition.
1174 * Call after the transmission is finished.
1175 *
1176 * Return: The advanced size if successful, or a negative error code on failure.
1177 */
1178int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1179{
1180 struct snd_rawmidi_runtime *runtime = substream->runtime;
1181 int result;
1182 unsigned long flags;
1183
1184 spin_lock_irqsave(&runtime->lock, flags);
1185 result = __snd_rawmidi_transmit_ack(substream, count);
1186 spin_unlock_irqrestore(&runtime->lock, flags);
1187 return result;
1188}
1189EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1190
1191/**
1192 * snd_rawmidi_transmit - copy from the buffer to the device
1193 * @substream: the rawmidi substream
1194 * @buffer: the buffer pointer
1195 * @count: the data size to transfer
1196 *
1197 * Copies data from the buffer to the device and advances the pointer.
1198 *
1199 * Return: The copied size if successful, or a negative error code on failure.
1200 */
1201int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1202 unsigned char *buffer, int count)
1203{
1204 struct snd_rawmidi_runtime *runtime = substream->runtime;
1205 int result;
1206 unsigned long flags;
1207
1208 spin_lock_irqsave(&runtime->lock, flags);
1209 if (!substream->opened)
1210 result = -EBADFD;
1211 else {
1212 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1213 if (count <= 0)
1214 result = count;
1215 else
1216 result = __snd_rawmidi_transmit_ack(substream, count);
1217 }
1218 spin_unlock_irqrestore(&runtime->lock, flags);
1219 return result;
1220}
1221EXPORT_SYMBOL(snd_rawmidi_transmit);
1222
1223static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1224 const unsigned char __user *userbuf,
1225 const unsigned char *kernelbuf,
1226 long count)
1227{
1228 unsigned long flags;
1229 long count1, result;
1230 struct snd_rawmidi_runtime *runtime = substream->runtime;
1231 unsigned long appl_ptr;
1232
1233 if (!kernelbuf && !userbuf)
1234 return -EINVAL;
1235 if (snd_BUG_ON(!runtime->buffer))
1236 return -EINVAL;
1237
1238 result = 0;
1239 spin_lock_irqsave(&runtime->lock, flags);
1240 if (substream->append) {
1241 if ((long)runtime->avail < count) {
1242 spin_unlock_irqrestore(&runtime->lock, flags);
1243 return -EAGAIN;
1244 }
1245 }
1246 while (count > 0 && runtime->avail > 0) {
1247 count1 = runtime->buffer_size - runtime->appl_ptr;
1248 if (count1 > count)
1249 count1 = count;
1250 if (count1 > (long)runtime->avail)
1251 count1 = runtime->avail;
1252
1253 /* update runtime->appl_ptr before unlocking for userbuf */
1254 appl_ptr = runtime->appl_ptr;
1255 runtime->appl_ptr += count1;
1256 runtime->appl_ptr %= runtime->buffer_size;
1257 runtime->avail -= count1;
1258
1259 if (kernelbuf)
1260 memcpy(runtime->buffer + appl_ptr,
1261 kernelbuf + result, count1);
1262 else if (userbuf) {
1263 spin_unlock_irqrestore(&runtime->lock, flags);
1264 if (copy_from_user(runtime->buffer + appl_ptr,
1265 userbuf + result, count1)) {
1266 spin_lock_irqsave(&runtime->lock, flags);
1267 result = result > 0 ? result : -EFAULT;
1268 goto __end;
1269 }
1270 spin_lock_irqsave(&runtime->lock, flags);
1271 }
1272 result += count1;
1273 count -= count1;
1274 }
1275 __end:
1276 count1 = runtime->avail < runtime->buffer_size;
1277 spin_unlock_irqrestore(&runtime->lock, flags);
1278 if (count1)
1279 snd_rawmidi_output_trigger(substream, 1);
1280 return result;
1281}
1282
1283long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1284 const unsigned char *buf, long count)
1285{
1286 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1287}
1288EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1289
1290static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1291 size_t count, loff_t *offset)
1292{
1293 long result, timeout;
1294 int count1;
1295 struct snd_rawmidi_file *rfile;
1296 struct snd_rawmidi_runtime *runtime;
1297 struct snd_rawmidi_substream *substream;
1298
1299 rfile = file->private_data;
1300 substream = rfile->output;
1301 runtime = substream->runtime;
1302 /* we cannot put an atomic message to our buffer */
1303 if (substream->append && count > runtime->buffer_size)
1304 return -EIO;
1305 result = 0;
1306 while (count > 0) {
1307 spin_lock_irq(&runtime->lock);
1308 while (!snd_rawmidi_ready_append(substream, count)) {
1309 wait_queue_t wait;
1310 if (file->f_flags & O_NONBLOCK) {
1311 spin_unlock_irq(&runtime->lock);
1312 return result > 0 ? result : -EAGAIN;
1313 }
1314 init_waitqueue_entry(&wait, current);
1315 add_wait_queue(&runtime->sleep, &wait);
1316 set_current_state(TASK_INTERRUPTIBLE);
1317 spin_unlock_irq(&runtime->lock);
1318 timeout = schedule_timeout(30 * HZ);
1319 remove_wait_queue(&runtime->sleep, &wait);
1320 if (rfile->rmidi->card->shutdown)
1321 return -ENODEV;
1322 if (signal_pending(current))
1323 return result > 0 ? result : -ERESTARTSYS;
1324 if (!runtime->avail && !timeout)
1325 return result > 0 ? result : -EIO;
1326 spin_lock_irq(&runtime->lock);
1327 }
1328 spin_unlock_irq(&runtime->lock);
1329 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1330 if (count1 < 0)
1331 return result > 0 ? result : count1;
1332 result += count1;
1333 buf += count1;
1334 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1335 break;
1336 count -= count1;
1337 }
1338 if (file->f_flags & O_DSYNC) {
1339 spin_lock_irq(&runtime->lock);
1340 while (runtime->avail != runtime->buffer_size) {
1341 wait_queue_t wait;
1342 unsigned int last_avail = runtime->avail;
1343 init_waitqueue_entry(&wait, current);
1344 add_wait_queue(&runtime->sleep, &wait);
1345 set_current_state(TASK_INTERRUPTIBLE);
1346 spin_unlock_irq(&runtime->lock);
1347 timeout = schedule_timeout(30 * HZ);
1348 remove_wait_queue(&runtime->sleep, &wait);
1349 if (signal_pending(current))
1350 return result > 0 ? result : -ERESTARTSYS;
1351 if (runtime->avail == last_avail && !timeout)
1352 return result > 0 ? result : -EIO;
1353 spin_lock_irq(&runtime->lock);
1354 }
1355 spin_unlock_irq(&runtime->lock);
1356 }
1357 return result;
1358}
1359
1360static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1361{
1362 struct snd_rawmidi_file *rfile;
1363 struct snd_rawmidi_runtime *runtime;
1364 unsigned int mask;
1365
1366 rfile = file->private_data;
1367 if (rfile->input != NULL) {
1368 runtime = rfile->input->runtime;
1369 snd_rawmidi_input_trigger(rfile->input, 1);
1370 poll_wait(file, &runtime->sleep, wait);
1371 }
1372 if (rfile->output != NULL) {
1373 runtime = rfile->output->runtime;
1374 poll_wait(file, &runtime->sleep, wait);
1375 }
1376 mask = 0;
1377 if (rfile->input != NULL) {
1378 if (snd_rawmidi_ready(rfile->input))
1379 mask |= POLLIN | POLLRDNORM;
1380 }
1381 if (rfile->output != NULL) {
1382 if (snd_rawmidi_ready(rfile->output))
1383 mask |= POLLOUT | POLLWRNORM;
1384 }
1385 return mask;
1386}
1387
1388/*
1389 */
1390#ifdef CONFIG_COMPAT
1391#include "rawmidi_compat.c"
1392#else
1393#define snd_rawmidi_ioctl_compat NULL
1394#endif
1395
1396/*
1397
1398 */
1399
1400static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1401 struct snd_info_buffer *buffer)
1402{
1403 struct snd_rawmidi *rmidi;
1404 struct snd_rawmidi_substream *substream;
1405 struct snd_rawmidi_runtime *runtime;
1406
1407 rmidi = entry->private_data;
1408 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1409 mutex_lock(&rmidi->open_mutex);
1410 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1411 list_for_each_entry(substream,
1412 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1413 list) {
1414 snd_iprintf(buffer,
1415 "Output %d\n"
1416 " Tx bytes : %lu\n",
1417 substream->number,
1418 (unsigned long) substream->bytes);
1419 if (substream->opened) {
1420 snd_iprintf(buffer,
1421 " Owner PID : %d\n",
1422 pid_vnr(substream->pid));
1423 runtime = substream->runtime;
1424 snd_iprintf(buffer,
1425 " Mode : %s\n"
1426 " Buffer size : %lu\n"
1427 " Avail : %lu\n",
1428 runtime->oss ? "OSS compatible" : "native",
1429 (unsigned long) runtime->buffer_size,
1430 (unsigned long) runtime->avail);
1431 }
1432 }
1433 }
1434 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1435 list_for_each_entry(substream,
1436 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1437 list) {
1438 snd_iprintf(buffer,
1439 "Input %d\n"
1440 " Rx bytes : %lu\n",
1441 substream->number,
1442 (unsigned long) substream->bytes);
1443 if (substream->opened) {
1444 snd_iprintf(buffer,
1445 " Owner PID : %d\n",
1446 pid_vnr(substream->pid));
1447 runtime = substream->runtime;
1448 snd_iprintf(buffer,
1449 " Buffer size : %lu\n"
1450 " Avail : %lu\n"
1451 " Overruns : %lu\n",
1452 (unsigned long) runtime->buffer_size,
1453 (unsigned long) runtime->avail,
1454 (unsigned long) runtime->xruns);
1455 }
1456 }
1457 }
1458 mutex_unlock(&rmidi->open_mutex);
1459}
1460
1461/*
1462 * Register functions
1463 */
1464
1465static const struct file_operations snd_rawmidi_f_ops =
1466{
1467 .owner = THIS_MODULE,
1468 .read = snd_rawmidi_read,
1469 .write = snd_rawmidi_write,
1470 .open = snd_rawmidi_open,
1471 .release = snd_rawmidi_release,
1472 .llseek = no_llseek,
1473 .poll = snd_rawmidi_poll,
1474 .unlocked_ioctl = snd_rawmidi_ioctl,
1475 .compat_ioctl = snd_rawmidi_ioctl_compat,
1476};
1477
1478static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1479 struct snd_rawmidi_str *stream,
1480 int direction,
1481 int count)
1482{
1483 struct snd_rawmidi_substream *substream;
1484 int idx;
1485
1486 for (idx = 0; idx < count; idx++) {
1487 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1488 if (!substream)
1489 return -ENOMEM;
1490 substream->stream = direction;
1491 substream->number = idx;
1492 substream->rmidi = rmidi;
1493 substream->pstr = stream;
1494 list_add_tail(&substream->list, &stream->substreams);
1495 stream->substream_count++;
1496 }
1497 return 0;
1498}
1499
1500static void release_rawmidi_device(struct device *dev)
1501{
1502 kfree(container_of(dev, struct snd_rawmidi, dev));
1503}
1504
1505/**
1506 * snd_rawmidi_new - create a rawmidi instance
1507 * @card: the card instance
1508 * @id: the id string
1509 * @device: the device index
1510 * @output_count: the number of output streams
1511 * @input_count: the number of input streams
1512 * @rrawmidi: the pointer to store the new rawmidi instance
1513 *
1514 * Creates a new rawmidi instance.
1515 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1516 *
1517 * Return: Zero if successful, or a negative error code on failure.
1518 */
1519int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1520 int output_count, int input_count,
1521 struct snd_rawmidi ** rrawmidi)
1522{
1523 struct snd_rawmidi *rmidi;
1524 int err;
1525 static struct snd_device_ops ops = {
1526 .dev_free = snd_rawmidi_dev_free,
1527 .dev_register = snd_rawmidi_dev_register,
1528 .dev_disconnect = snd_rawmidi_dev_disconnect,
1529 };
1530
1531 if (snd_BUG_ON(!card))
1532 return -ENXIO;
1533 if (rrawmidi)
1534 *rrawmidi = NULL;
1535 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1536 if (!rmidi)
1537 return -ENOMEM;
1538 rmidi->card = card;
1539 rmidi->device = device;
1540 mutex_init(&rmidi->open_mutex);
1541 init_waitqueue_head(&rmidi->open_wait);
1542 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1543 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1544
1545 if (id != NULL)
1546 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1547
1548 snd_device_initialize(&rmidi->dev, card);
1549 rmidi->dev.release = release_rawmidi_device;
1550 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1551
1552 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1553 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1554 SNDRV_RAWMIDI_STREAM_INPUT,
1555 input_count)) < 0) {
1556 snd_rawmidi_free(rmidi);
1557 return err;
1558 }
1559 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1560 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1561 SNDRV_RAWMIDI_STREAM_OUTPUT,
1562 output_count)) < 0) {
1563 snd_rawmidi_free(rmidi);
1564 return err;
1565 }
1566 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1567 snd_rawmidi_free(rmidi);
1568 return err;
1569 }
1570 if (rrawmidi)
1571 *rrawmidi = rmidi;
1572 return 0;
1573}
1574EXPORT_SYMBOL(snd_rawmidi_new);
1575
1576static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1577{
1578 struct snd_rawmidi_substream *substream;
1579
1580 while (!list_empty(&stream->substreams)) {
1581 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1582 list_del(&substream->list);
1583 kfree(substream);
1584 }
1585}
1586
1587static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1588{
1589 if (!rmidi)
1590 return 0;
1591
1592 snd_info_free_entry(rmidi->proc_entry);
1593 rmidi->proc_entry = NULL;
1594 mutex_lock(®ister_mutex);
1595 if (rmidi->ops && rmidi->ops->dev_unregister)
1596 rmidi->ops->dev_unregister(rmidi);
1597 mutex_unlock(®ister_mutex);
1598
1599 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1600 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1601 if (rmidi->private_free)
1602 rmidi->private_free(rmidi);
1603 put_device(&rmidi->dev);
1604 return 0;
1605}
1606
1607static int snd_rawmidi_dev_free(struct snd_device *device)
1608{
1609 struct snd_rawmidi *rmidi = device->device_data;
1610 return snd_rawmidi_free(rmidi);
1611}
1612
1613#if IS_REACHABLE(CONFIG_SND_SEQUENCER)
1614static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1615{
1616 struct snd_rawmidi *rmidi = device->private_data;
1617 rmidi->seq_dev = NULL;
1618}
1619#endif
1620
1621static int snd_rawmidi_dev_register(struct snd_device *device)
1622{
1623 int err;
1624 struct snd_info_entry *entry;
1625 char name[16];
1626 struct snd_rawmidi *rmidi = device->device_data;
1627
1628 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1629 return -ENOMEM;
1630 mutex_lock(®ister_mutex);
1631 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1632 mutex_unlock(®ister_mutex);
1633 return -EBUSY;
1634 }
1635 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1636 mutex_unlock(®ister_mutex);
1637 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1638 rmidi->card, rmidi->device,
1639 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1640 if (err < 0) {
1641 rmidi_err(rmidi, "unable to register\n");
1642 mutex_lock(®ister_mutex);
1643 list_del(&rmidi->list);
1644 mutex_unlock(®ister_mutex);
1645 return err;
1646 }
1647 if (rmidi->ops && rmidi->ops->dev_register &&
1648 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1649 snd_unregister_device(&rmidi->dev);
1650 mutex_lock(®ister_mutex);
1651 list_del(&rmidi->list);
1652 mutex_unlock(®ister_mutex);
1653 return err;
1654 }
1655#ifdef CONFIG_SND_OSSEMUL
1656 rmidi->ossreg = 0;
1657 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1658 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1659 rmidi->card, 0, &snd_rawmidi_f_ops,
1660 rmidi) < 0) {
1661 rmidi_err(rmidi,
1662 "unable to register OSS rawmidi device %i:%i\n",
1663 rmidi->card->number, 0);
1664 } else {
1665 rmidi->ossreg++;
1666#ifdef SNDRV_OSS_INFO_DEV_MIDI
1667 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1668#endif
1669 }
1670 }
1671 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1672 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1673 rmidi->card, 1, &snd_rawmidi_f_ops,
1674 rmidi) < 0) {
1675 rmidi_err(rmidi,
1676 "unable to register OSS rawmidi device %i:%i\n",
1677 rmidi->card->number, 1);
1678 } else {
1679 rmidi->ossreg++;
1680 }
1681 }
1682#endif /* CONFIG_SND_OSSEMUL */
1683 sprintf(name, "midi%d", rmidi->device);
1684 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1685 if (entry) {
1686 entry->private_data = rmidi;
1687 entry->c.text.read = snd_rawmidi_proc_info_read;
1688 if (snd_info_register(entry) < 0) {
1689 snd_info_free_entry(entry);
1690 entry = NULL;
1691 }
1692 }
1693 rmidi->proc_entry = entry;
1694#if IS_REACHABLE(CONFIG_SND_SEQUENCER)
1695 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1696 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1697 rmidi->seq_dev->private_data = rmidi;
1698 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1699 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1700 snd_device_register(rmidi->card, rmidi->seq_dev);
1701 }
1702 }
1703#endif
1704 return 0;
1705}
1706
1707static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1708{
1709 struct snd_rawmidi *rmidi = device->device_data;
1710 int dir;
1711
1712 mutex_lock(®ister_mutex);
1713 mutex_lock(&rmidi->open_mutex);
1714 wake_up(&rmidi->open_wait);
1715 list_del_init(&rmidi->list);
1716 for (dir = 0; dir < 2; dir++) {
1717 struct snd_rawmidi_substream *s;
1718 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1719 if (s->runtime)
1720 wake_up(&s->runtime->sleep);
1721 }
1722 }
1723
1724#ifdef CONFIG_SND_OSSEMUL
1725 if (rmidi->ossreg) {
1726 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1727 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1728#ifdef SNDRV_OSS_INFO_DEV_MIDI
1729 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1730#endif
1731 }
1732 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1733 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1734 rmidi->ossreg = 0;
1735 }
1736#endif /* CONFIG_SND_OSSEMUL */
1737 snd_unregister_device(&rmidi->dev);
1738 mutex_unlock(&rmidi->open_mutex);
1739 mutex_unlock(®ister_mutex);
1740 return 0;
1741}
1742
1743/**
1744 * snd_rawmidi_set_ops - set the rawmidi operators
1745 * @rmidi: the rawmidi instance
1746 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1747 * @ops: the operator table
1748 *
1749 * Sets the rawmidi operators for the given stream direction.
1750 */
1751void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1752 struct snd_rawmidi_ops *ops)
1753{
1754 struct snd_rawmidi_substream *substream;
1755
1756 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1757 substream->ops = ops;
1758}
1759EXPORT_SYMBOL(snd_rawmidi_set_ops);
1760
1761/*
1762 * ENTRY functions
1763 */
1764
1765static int __init alsa_rawmidi_init(void)
1766{
1767
1768 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1769 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1770#ifdef CONFIG_SND_OSSEMUL
1771 { int i;
1772 /* check device map table */
1773 for (i = 0; i < SNDRV_CARDS; i++) {
1774 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1775 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1776 i, midi_map[i]);
1777 midi_map[i] = 0;
1778 }
1779 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1780 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1781 i, amidi_map[i]);
1782 amidi_map[i] = 1;
1783 }
1784 }
1785 }
1786#endif /* CONFIG_SND_OSSEMUL */
1787 return 0;
1788}
1789
1790static void __exit alsa_rawmidi_exit(void)
1791{
1792 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1793 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1794}
1795
1796module_init(alsa_rawmidi_init)
1797module_exit(alsa_rawmidi_exit)