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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
37
38static int snd_rawmidi_free(struct snd_rawmidi *rmidi);
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;
56 s32 tstamp_nsec;
57 u32 avail;
58 u32 xruns;
59 unsigned char reserved[16];
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];
67 s64 tstamp_sec;
68 s64 tstamp_nsec;
69 size_t avail;
70 size_t xruns;
71 unsigned char reserved[16];
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 bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
99{
100 return runtime->avail >= runtime->avail_min;
101}
102
103static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
104{
105 struct snd_rawmidi_runtime *runtime = substream->runtime;
106 unsigned long flags;
107 bool ready;
108
109 spin_lock_irqsave(&runtime->lock, flags);
110 ready = __snd_rawmidi_ready(runtime);
111 spin_unlock_irqrestore(&runtime->lock, flags);
112 return ready;
113}
114
115static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
116 size_t count)
117{
118 struct snd_rawmidi_runtime *runtime = substream->runtime;
119
120 return runtime->avail >= runtime->avail_min &&
121 (!substream->append || runtime->avail >= count);
122}
123
124static void snd_rawmidi_input_event_work(struct work_struct *work)
125{
126 struct snd_rawmidi_runtime *runtime =
127 container_of(work, struct snd_rawmidi_runtime, event_work);
128
129 if (runtime->event)
130 runtime->event(runtime->substream);
131}
132
133
134static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
135{
136 runtime->buffer_ref++;
137}
138
139static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
140{
141 runtime->buffer_ref--;
142}
143
144static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
145{
146 struct snd_rawmidi_runtime *runtime;
147
148 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
149 if (!runtime)
150 return -ENOMEM;
151 runtime->substream = substream;
152 spin_lock_init(&runtime->lock);
153 init_waitqueue_head(&runtime->sleep);
154 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
155 runtime->event = NULL;
156 runtime->buffer_size = PAGE_SIZE;
157 runtime->avail_min = 1;
158 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
159 runtime->avail = 0;
160 else
161 runtime->avail = runtime->buffer_size;
162 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
163 if (!runtime->buffer) {
164 kfree(runtime);
165 return -ENOMEM;
166 }
167 runtime->appl_ptr = runtime->hw_ptr = 0;
168 substream->runtime = runtime;
169 return 0;
170}
171
172static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
173{
174 struct snd_rawmidi_runtime *runtime = substream->runtime;
175
176 kvfree(runtime->buffer);
177 kfree(runtime);
178 substream->runtime = NULL;
179 return 0;
180}
181
182static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
183{
184 if (!substream->opened)
185 return;
186 substream->ops->trigger(substream, up);
187}
188
189static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
190{
191 if (!substream->opened)
192 return;
193 substream->ops->trigger(substream, up);
194 if (!up)
195 cancel_work_sync(&substream->runtime->event_work);
196}
197
198static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
199 bool is_input)
200{
201 runtime->drain = 0;
202 runtime->appl_ptr = runtime->hw_ptr = 0;
203 runtime->avail = is_input ? 0 : runtime->buffer_size;
204}
205
206static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
207 bool is_input)
208{
209 unsigned long flags;
210
211 spin_lock_irqsave(&runtime->lock, flags);
212 __reset_runtime_ptrs(runtime, is_input);
213 spin_unlock_irqrestore(&runtime->lock, flags);
214}
215
216int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
217{
218 snd_rawmidi_output_trigger(substream, 0);
219 reset_runtime_ptrs(substream->runtime, false);
220 return 0;
221}
222EXPORT_SYMBOL(snd_rawmidi_drop_output);
223
224int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
225{
226 int err;
227 long timeout;
228 struct snd_rawmidi_runtime *runtime = substream->runtime;
229
230 err = 0;
231 runtime->drain = 1;
232 timeout = wait_event_interruptible_timeout(runtime->sleep,
233 (runtime->avail >= runtime->buffer_size),
234 10*HZ);
235 if (signal_pending(current))
236 err = -ERESTARTSYS;
237 if (runtime->avail < runtime->buffer_size && !timeout) {
238 rmidi_warn(substream->rmidi,
239 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
240 (long)runtime->avail, (long)runtime->buffer_size);
241 err = -EIO;
242 }
243 runtime->drain = 0;
244 if (err != -ERESTARTSYS) {
245
246 if (substream->ops->drain)
247 substream->ops->drain(substream);
248 else
249 msleep(50);
250 snd_rawmidi_drop_output(substream);
251 }
252 return err;
253}
254EXPORT_SYMBOL(snd_rawmidi_drain_output);
255
256int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
257{
258 snd_rawmidi_input_trigger(substream, 0);
259 reset_runtime_ptrs(substream->runtime, true);
260 return 0;
261}
262EXPORT_SYMBOL(snd_rawmidi_drain_input);
263
264
265
266
267static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
268 int stream, int mode,
269 struct snd_rawmidi_substream **sub_ret)
270{
271 struct snd_rawmidi_substream *substream;
272 struct snd_rawmidi_str *s = &rmidi->streams[stream];
273 static const unsigned int info_flags[2] = {
274 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
275 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
276 };
277
278 if (!(rmidi->info_flags & info_flags[stream]))
279 return -ENXIO;
280 if (subdevice >= 0 && subdevice >= s->substream_count)
281 return -ENODEV;
282
283 list_for_each_entry(substream, &s->substreams, list) {
284 if (substream->opened) {
285 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
286 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
287 !substream->append)
288 continue;
289 }
290 if (subdevice < 0 || subdevice == substream->number) {
291 *sub_ret = substream;
292 return 0;
293 }
294 }
295 return -EAGAIN;
296}
297
298
299static int open_substream(struct snd_rawmidi *rmidi,
300 struct snd_rawmidi_substream *substream,
301 int mode)
302{
303 int err;
304
305 if (substream->use_count == 0) {
306 err = snd_rawmidi_runtime_create(substream);
307 if (err < 0)
308 return err;
309 err = substream->ops->open(substream);
310 if (err < 0) {
311 snd_rawmidi_runtime_free(substream);
312 return err;
313 }
314 substream->opened = 1;
315 substream->active_sensing = 0;
316 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
317 substream->append = 1;
318 substream->pid = get_pid(task_pid(current));
319 rmidi->streams[substream->stream].substream_opened++;
320 }
321 substream->use_count++;
322 return 0;
323}
324
325static void close_substream(struct snd_rawmidi *rmidi,
326 struct snd_rawmidi_substream *substream,
327 int cleanup);
328
329static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
330 struct snd_rawmidi_file *rfile)
331{
332 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
333 int err;
334
335 rfile->input = rfile->output = NULL;
336 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
337 err = assign_substream(rmidi, subdevice,
338 SNDRV_RAWMIDI_STREAM_INPUT,
339 mode, &sinput);
340 if (err < 0)
341 return err;
342 }
343 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
344 err = assign_substream(rmidi, subdevice,
345 SNDRV_RAWMIDI_STREAM_OUTPUT,
346 mode, &soutput);
347 if (err < 0)
348 return err;
349 }
350
351 if (sinput) {
352 err = open_substream(rmidi, sinput, mode);
353 if (err < 0)
354 return err;
355 }
356 if (soutput) {
357 err = open_substream(rmidi, soutput, mode);
358 if (err < 0) {
359 if (sinput)
360 close_substream(rmidi, sinput, 0);
361 return err;
362 }
363 }
364
365 rfile->rmidi = rmidi;
366 rfile->input = sinput;
367 rfile->output = soutput;
368 return 0;
369}
370
371
372int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
373 int mode, struct snd_rawmidi_file *rfile)
374{
375 struct snd_rawmidi *rmidi;
376 int err = 0;
377
378 if (snd_BUG_ON(!rfile))
379 return -EINVAL;
380
381 mutex_lock(®ister_mutex);
382 rmidi = snd_rawmidi_search(card, device);
383 if (!rmidi)
384 err = -ENODEV;
385 else if (!try_module_get(rmidi->card->module))
386 err = -ENXIO;
387 mutex_unlock(®ister_mutex);
388 if (err < 0)
389 return err;
390
391 mutex_lock(&rmidi->open_mutex);
392 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
393 mutex_unlock(&rmidi->open_mutex);
394 if (err < 0)
395 module_put(rmidi->card->module);
396 return err;
397}
398EXPORT_SYMBOL(snd_rawmidi_kernel_open);
399
400static int snd_rawmidi_open(struct inode *inode, struct file *file)
401{
402 int maj = imajor(inode);
403 struct snd_card *card;
404 int subdevice;
405 unsigned short fflags;
406 int err;
407 struct snd_rawmidi *rmidi;
408 struct snd_rawmidi_file *rawmidi_file = NULL;
409 wait_queue_entry_t wait;
410
411 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
412 return -EINVAL;
413
414 err = stream_open(inode, file);
415 if (err < 0)
416 return err;
417
418 if (maj == snd_major) {
419 rmidi = snd_lookup_minor_data(iminor(inode),
420 SNDRV_DEVICE_TYPE_RAWMIDI);
421#ifdef CONFIG_SND_OSSEMUL
422 } else if (maj == SOUND_MAJOR) {
423 rmidi = snd_lookup_oss_minor_data(iminor(inode),
424 SNDRV_OSS_DEVICE_TYPE_MIDI);
425#endif
426 } else
427 return -ENXIO;
428
429 if (rmidi == NULL)
430 return -ENODEV;
431
432 if (!try_module_get(rmidi->card->module)) {
433 snd_card_unref(rmidi->card);
434 return -ENXIO;
435 }
436
437 mutex_lock(&rmidi->open_mutex);
438 card = rmidi->card;
439 err = snd_card_file_add(card, file);
440 if (err < 0)
441 goto __error_card;
442 fflags = snd_rawmidi_file_flags(file);
443 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR)
444 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
445 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
446 if (rawmidi_file == NULL) {
447 err = -ENOMEM;
448 goto __error;
449 }
450 init_waitqueue_entry(&wait, current);
451 add_wait_queue(&rmidi->open_wait, &wait);
452 while (1) {
453 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
454 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
455 if (err >= 0)
456 break;
457 if (err == -EAGAIN) {
458 if (file->f_flags & O_NONBLOCK) {
459 err = -EBUSY;
460 break;
461 }
462 } else
463 break;
464 set_current_state(TASK_INTERRUPTIBLE);
465 mutex_unlock(&rmidi->open_mutex);
466 schedule();
467 mutex_lock(&rmidi->open_mutex);
468 if (rmidi->card->shutdown) {
469 err = -ENODEV;
470 break;
471 }
472 if (signal_pending(current)) {
473 err = -ERESTARTSYS;
474 break;
475 }
476 }
477 remove_wait_queue(&rmidi->open_wait, &wait);
478 if (err < 0) {
479 kfree(rawmidi_file);
480 goto __error;
481 }
482#ifdef CONFIG_SND_OSSEMUL
483 if (rawmidi_file->input && rawmidi_file->input->runtime)
484 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
485 if (rawmidi_file->output && rawmidi_file->output->runtime)
486 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
487#endif
488 file->private_data = rawmidi_file;
489 mutex_unlock(&rmidi->open_mutex);
490 snd_card_unref(rmidi->card);
491 return 0;
492
493 __error:
494 snd_card_file_remove(card, file);
495 __error_card:
496 mutex_unlock(&rmidi->open_mutex);
497 module_put(rmidi->card->module);
498 snd_card_unref(rmidi->card);
499 return err;
500}
501
502static void close_substream(struct snd_rawmidi *rmidi,
503 struct snd_rawmidi_substream *substream,
504 int cleanup)
505{
506 if (--substream->use_count)
507 return;
508
509 if (cleanup) {
510 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
511 snd_rawmidi_input_trigger(substream, 0);
512 else {
513 if (substream->active_sensing) {
514 unsigned char buf = 0xfe;
515
516
517
518 snd_rawmidi_kernel_write(substream, &buf, 1);
519 }
520 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
521 snd_rawmidi_output_trigger(substream, 0);
522 }
523 }
524 substream->ops->close(substream);
525 if (substream->runtime->private_free)
526 substream->runtime->private_free(substream);
527 snd_rawmidi_runtime_free(substream);
528 substream->opened = 0;
529 substream->append = 0;
530 put_pid(substream->pid);
531 substream->pid = NULL;
532 rmidi->streams[substream->stream].substream_opened--;
533}
534
535static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
536{
537 struct snd_rawmidi *rmidi;
538
539 rmidi = rfile->rmidi;
540 mutex_lock(&rmidi->open_mutex);
541 if (rfile->input) {
542 close_substream(rmidi, rfile->input, 1);
543 rfile->input = NULL;
544 }
545 if (rfile->output) {
546 close_substream(rmidi, rfile->output, 1);
547 rfile->output = NULL;
548 }
549 rfile->rmidi = NULL;
550 mutex_unlock(&rmidi->open_mutex);
551 wake_up(&rmidi->open_wait);
552}
553
554
555int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
556{
557 struct snd_rawmidi *rmidi;
558
559 if (snd_BUG_ON(!rfile))
560 return -ENXIO;
561
562 rmidi = rfile->rmidi;
563 rawmidi_release_priv(rfile);
564 module_put(rmidi->card->module);
565 return 0;
566}
567EXPORT_SYMBOL(snd_rawmidi_kernel_release);
568
569static int snd_rawmidi_release(struct inode *inode, struct file *file)
570{
571 struct snd_rawmidi_file *rfile;
572 struct snd_rawmidi *rmidi;
573 struct module *module;
574
575 rfile = file->private_data;
576 rmidi = rfile->rmidi;
577 rawmidi_release_priv(rfile);
578 kfree(rfile);
579 module = rmidi->card->module;
580 snd_card_file_remove(rmidi->card, file);
581 module_put(module);
582 return 0;
583}
584
585static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
586 struct snd_rawmidi_info *info)
587{
588 struct snd_rawmidi *rmidi;
589
590 if (substream == NULL)
591 return -ENODEV;
592 rmidi = substream->rmidi;
593 memset(info, 0, sizeof(*info));
594 info->card = rmidi->card->number;
595 info->device = rmidi->device;
596 info->subdevice = substream->number;
597 info->stream = substream->stream;
598 info->flags = rmidi->info_flags;
599 strcpy(info->id, rmidi->id);
600 strcpy(info->name, rmidi->name);
601 strcpy(info->subname, substream->name);
602 info->subdevices_count = substream->pstr->substream_count;
603 info->subdevices_avail = (substream->pstr->substream_count -
604 substream->pstr->substream_opened);
605 return 0;
606}
607
608static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
609 struct snd_rawmidi_info __user *_info)
610{
611 struct snd_rawmidi_info info;
612 int err;
613
614 err = snd_rawmidi_info(substream, &info);
615 if (err < 0)
616 return err;
617 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
618 return -EFAULT;
619 return 0;
620}
621
622static int __snd_rawmidi_info_select(struct snd_card *card,
623 struct snd_rawmidi_info *info)
624{
625 struct snd_rawmidi *rmidi;
626 struct snd_rawmidi_str *pstr;
627 struct snd_rawmidi_substream *substream;
628
629 rmidi = snd_rawmidi_search(card, info->device);
630 if (!rmidi)
631 return -ENXIO;
632 if (info->stream < 0 || info->stream > 1)
633 return -EINVAL;
634 info->stream = array_index_nospec(info->stream, 2);
635 pstr = &rmidi->streams[info->stream];
636 if (pstr->substream_count == 0)
637 return -ENOENT;
638 if (info->subdevice >= pstr->substream_count)
639 return -ENXIO;
640 list_for_each_entry(substream, &pstr->substreams, list) {
641 if ((unsigned int)substream->number == info->subdevice)
642 return snd_rawmidi_info(substream, info);
643 }
644 return -ENXIO;
645}
646
647int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
648{
649 int ret;
650
651 mutex_lock(®ister_mutex);
652 ret = __snd_rawmidi_info_select(card, info);
653 mutex_unlock(®ister_mutex);
654 return ret;
655}
656EXPORT_SYMBOL(snd_rawmidi_info_select);
657
658static int snd_rawmidi_info_select_user(struct snd_card *card,
659 struct snd_rawmidi_info __user *_info)
660{
661 int err;
662 struct snd_rawmidi_info info;
663
664 if (get_user(info.device, &_info->device))
665 return -EFAULT;
666 if (get_user(info.stream, &_info->stream))
667 return -EFAULT;
668 if (get_user(info.subdevice, &_info->subdevice))
669 return -EFAULT;
670 err = snd_rawmidi_info_select(card, &info);
671 if (err < 0)
672 return err;
673 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
674 return -EFAULT;
675 return 0;
676}
677
678static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
679 struct snd_rawmidi_params *params,
680 bool is_input)
681{
682 char *newbuf, *oldbuf;
683
684 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
685 return -EINVAL;
686 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
687 return -EINVAL;
688 if (params->buffer_size != runtime->buffer_size) {
689 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
690 if (!newbuf)
691 return -ENOMEM;
692 spin_lock_irq(&runtime->lock);
693 if (runtime->buffer_ref) {
694 spin_unlock_irq(&runtime->lock);
695 kvfree(newbuf);
696 return -EBUSY;
697 }
698 oldbuf = runtime->buffer;
699 runtime->buffer = newbuf;
700 runtime->buffer_size = params->buffer_size;
701 __reset_runtime_ptrs(runtime, is_input);
702 spin_unlock_irq(&runtime->lock);
703 kvfree(oldbuf);
704 }
705 runtime->avail_min = params->avail_min;
706 return 0;
707}
708
709int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
710 struct snd_rawmidi_params *params)
711{
712 if (substream->append && substream->use_count > 1)
713 return -EBUSY;
714 snd_rawmidi_drain_output(substream);
715 substream->active_sensing = !params->no_active_sensing;
716 return resize_runtime_buffer(substream->runtime, params, false);
717}
718EXPORT_SYMBOL(snd_rawmidi_output_params);
719
720int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
721 struct snd_rawmidi_params *params)
722{
723 snd_rawmidi_drain_input(substream);
724 return resize_runtime_buffer(substream->runtime, params, true);
725}
726EXPORT_SYMBOL(snd_rawmidi_input_params);
727
728static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
729 struct snd_rawmidi_status64 *status)
730{
731 struct snd_rawmidi_runtime *runtime = substream->runtime;
732
733 memset(status, 0, sizeof(*status));
734 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
735 spin_lock_irq(&runtime->lock);
736 status->avail = runtime->avail;
737 spin_unlock_irq(&runtime->lock);
738 return 0;
739}
740
741static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
742 struct snd_rawmidi_status64 *status)
743{
744 struct snd_rawmidi_runtime *runtime = substream->runtime;
745
746 memset(status, 0, sizeof(*status));
747 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
748 spin_lock_irq(&runtime->lock);
749 status->avail = runtime->avail;
750 status->xruns = runtime->xruns;
751 runtime->xruns = 0;
752 spin_unlock_irq(&runtime->lock);
753 return 0;
754}
755
756static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
757 struct snd_rawmidi_status32 __user *argp)
758{
759 int err = 0;
760 struct snd_rawmidi_status32 __user *status = argp;
761 struct snd_rawmidi_status32 status32;
762 struct snd_rawmidi_status64 status64;
763
764 if (copy_from_user(&status32, argp,
765 sizeof(struct snd_rawmidi_status32)))
766 return -EFAULT;
767
768 switch (status32.stream) {
769 case SNDRV_RAWMIDI_STREAM_OUTPUT:
770 if (rfile->output == NULL)
771 return -EINVAL;
772 err = snd_rawmidi_output_status(rfile->output, &status64);
773 break;
774 case SNDRV_RAWMIDI_STREAM_INPUT:
775 if (rfile->input == NULL)
776 return -EINVAL;
777 err = snd_rawmidi_input_status(rfile->input, &status64);
778 break;
779 default:
780 return -EINVAL;
781 }
782 if (err < 0)
783 return err;
784
785 status32 = (struct snd_rawmidi_status32) {
786 .stream = status64.stream,
787 .tstamp_sec = status64.tstamp_sec,
788 .tstamp_nsec = status64.tstamp_nsec,
789 .avail = status64.avail,
790 .xruns = status64.xruns,
791 };
792
793 if (copy_to_user(status, &status32, sizeof(*status)))
794 return -EFAULT;
795
796 return 0;
797}
798
799static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
800 struct snd_rawmidi_status64 __user *argp)
801{
802 int err = 0;
803 struct snd_rawmidi_status64 status;
804
805 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
806 return -EFAULT;
807
808 switch (status.stream) {
809 case SNDRV_RAWMIDI_STREAM_OUTPUT:
810 if (rfile->output == NULL)
811 return -EINVAL;
812 err = snd_rawmidi_output_status(rfile->output, &status);
813 break;
814 case SNDRV_RAWMIDI_STREAM_INPUT:
815 if (rfile->input == NULL)
816 return -EINVAL;
817 err = snd_rawmidi_input_status(rfile->input, &status);
818 break;
819 default:
820 return -EINVAL;
821 }
822 if (err < 0)
823 return err;
824 if (copy_to_user(argp, &status,
825 sizeof(struct snd_rawmidi_status64)))
826 return -EFAULT;
827 return 0;
828}
829
830static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
831{
832 struct snd_rawmidi_file *rfile;
833 void __user *argp = (void __user *)arg;
834
835 rfile = file->private_data;
836 if (((cmd >> 8) & 0xff) != 'W')
837 return -ENOTTY;
838 switch (cmd) {
839 case SNDRV_RAWMIDI_IOCTL_PVERSION:
840 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
841 case SNDRV_RAWMIDI_IOCTL_INFO:
842 {
843 int stream;
844 struct snd_rawmidi_info __user *info = argp;
845
846 if (get_user(stream, &info->stream))
847 return -EFAULT;
848 switch (stream) {
849 case SNDRV_RAWMIDI_STREAM_INPUT:
850 return snd_rawmidi_info_user(rfile->input, info);
851 case SNDRV_RAWMIDI_STREAM_OUTPUT:
852 return snd_rawmidi_info_user(rfile->output, info);
853 default:
854 return -EINVAL;
855 }
856 }
857 case SNDRV_RAWMIDI_IOCTL_PARAMS:
858 {
859 struct snd_rawmidi_params params;
860
861 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
862 return -EFAULT;
863 switch (params.stream) {
864 case SNDRV_RAWMIDI_STREAM_OUTPUT:
865 if (rfile->output == NULL)
866 return -EINVAL;
867 return snd_rawmidi_output_params(rfile->output, ¶ms);
868 case SNDRV_RAWMIDI_STREAM_INPUT:
869 if (rfile->input == NULL)
870 return -EINVAL;
871 return snd_rawmidi_input_params(rfile->input, ¶ms);
872 default:
873 return -EINVAL;
874 }
875 }
876 case SNDRV_RAWMIDI_IOCTL_STATUS32:
877 return snd_rawmidi_ioctl_status32(rfile, argp);
878 case SNDRV_RAWMIDI_IOCTL_STATUS64:
879 return snd_rawmidi_ioctl_status64(rfile, argp);
880 case SNDRV_RAWMIDI_IOCTL_DROP:
881 {
882 int val;
883
884 if (get_user(val, (int __user *) argp))
885 return -EFAULT;
886 switch (val) {
887 case SNDRV_RAWMIDI_STREAM_OUTPUT:
888 if (rfile->output == NULL)
889 return -EINVAL;
890 return snd_rawmidi_drop_output(rfile->output);
891 default:
892 return -EINVAL;
893 }
894 }
895 case SNDRV_RAWMIDI_IOCTL_DRAIN:
896 {
897 int val;
898
899 if (get_user(val, (int __user *) argp))
900 return -EFAULT;
901 switch (val) {
902 case SNDRV_RAWMIDI_STREAM_OUTPUT:
903 if (rfile->output == NULL)
904 return -EINVAL;
905 return snd_rawmidi_drain_output(rfile->output);
906 case SNDRV_RAWMIDI_STREAM_INPUT:
907 if (rfile->input == NULL)
908 return -EINVAL;
909 return snd_rawmidi_drain_input(rfile->input);
910 default:
911 return -EINVAL;
912 }
913 }
914 default:
915 rmidi_dbg(rfile->rmidi,
916 "rawmidi: unknown command = 0x%x\n", cmd);
917 }
918 return -ENOTTY;
919}
920
921static int snd_rawmidi_control_ioctl(struct snd_card *card,
922 struct snd_ctl_file *control,
923 unsigned int cmd,
924 unsigned long arg)
925{
926 void __user *argp = (void __user *)arg;
927
928 switch (cmd) {
929 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
930 {
931 int device;
932
933 if (get_user(device, (int __user *)argp))
934 return -EFAULT;
935 if (device >= SNDRV_RAWMIDI_DEVICES)
936 device = SNDRV_RAWMIDI_DEVICES - 1;
937 mutex_lock(®ister_mutex);
938 device = device < 0 ? 0 : device + 1;
939 while (device < SNDRV_RAWMIDI_DEVICES) {
940 if (snd_rawmidi_search(card, device))
941 break;
942 device++;
943 }
944 if (device == SNDRV_RAWMIDI_DEVICES)
945 device = -1;
946 mutex_unlock(®ister_mutex);
947 if (put_user(device, (int __user *)argp))
948 return -EFAULT;
949 return 0;
950 }
951 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
952 {
953 int val;
954
955 if (get_user(val, (int __user *)argp))
956 return -EFAULT;
957 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
958 return 0;
959 }
960 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
961 return snd_rawmidi_info_select_user(card, argp);
962 }
963 return -ENOIOCTLCMD;
964}
965
966
967
968
969
970
971
972
973
974
975
976int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
977 const unsigned char *buffer, int count)
978{
979 unsigned long flags;
980 int result = 0, count1;
981 struct snd_rawmidi_runtime *runtime = substream->runtime;
982
983 if (!substream->opened)
984 return -EBADFD;
985 if (runtime->buffer == NULL) {
986 rmidi_dbg(substream->rmidi,
987 "snd_rawmidi_receive: input is not active!!!\n");
988 return -EINVAL;
989 }
990 spin_lock_irqsave(&runtime->lock, flags);
991 if (count == 1) {
992 substream->bytes++;
993 if (runtime->avail < runtime->buffer_size) {
994 runtime->buffer[runtime->hw_ptr++] = buffer[0];
995 runtime->hw_ptr %= runtime->buffer_size;
996 runtime->avail++;
997 result++;
998 } else {
999 runtime->xruns++;
1000 }
1001 } else {
1002 substream->bytes += count;
1003 count1 = runtime->buffer_size - runtime->hw_ptr;
1004 if (count1 > count)
1005 count1 = count;
1006 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1007 count1 = runtime->buffer_size - runtime->avail;
1008 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1009 runtime->hw_ptr += count1;
1010 runtime->hw_ptr %= runtime->buffer_size;
1011 runtime->avail += count1;
1012 count -= count1;
1013 result += count1;
1014 if (count > 0) {
1015 buffer += count1;
1016 count1 = count;
1017 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1018 count1 = runtime->buffer_size - runtime->avail;
1019 runtime->xruns += count - count1;
1020 }
1021 if (count1 > 0) {
1022 memcpy(runtime->buffer, buffer, count1);
1023 runtime->hw_ptr = count1;
1024 runtime->avail += count1;
1025 result += count1;
1026 }
1027 }
1028 }
1029 if (result > 0) {
1030 if (runtime->event)
1031 schedule_work(&runtime->event_work);
1032 else if (__snd_rawmidi_ready(runtime))
1033 wake_up(&runtime->sleep);
1034 }
1035 spin_unlock_irqrestore(&runtime->lock, flags);
1036 return result;
1037}
1038EXPORT_SYMBOL(snd_rawmidi_receive);
1039
1040static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1041 unsigned char __user *userbuf,
1042 unsigned char *kernelbuf, long count)
1043{
1044 unsigned long flags;
1045 long result = 0, count1;
1046 struct snd_rawmidi_runtime *runtime = substream->runtime;
1047 unsigned long appl_ptr;
1048 int err = 0;
1049
1050 spin_lock_irqsave(&runtime->lock, flags);
1051 snd_rawmidi_buffer_ref(runtime);
1052 while (count > 0 && runtime->avail) {
1053 count1 = runtime->buffer_size - runtime->appl_ptr;
1054 if (count1 > count)
1055 count1 = count;
1056 if (count1 > (int)runtime->avail)
1057 count1 = runtime->avail;
1058
1059
1060 appl_ptr = runtime->appl_ptr;
1061 runtime->appl_ptr += count1;
1062 runtime->appl_ptr %= runtime->buffer_size;
1063 runtime->avail -= count1;
1064
1065 if (kernelbuf)
1066 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1067 if (userbuf) {
1068 spin_unlock_irqrestore(&runtime->lock, flags);
1069 if (copy_to_user(userbuf + result,
1070 runtime->buffer + appl_ptr, count1))
1071 err = -EFAULT;
1072 spin_lock_irqsave(&runtime->lock, flags);
1073 if (err)
1074 goto out;
1075 }
1076 result += count1;
1077 count -= count1;
1078 }
1079 out:
1080 snd_rawmidi_buffer_unref(runtime);
1081 spin_unlock_irqrestore(&runtime->lock, flags);
1082 return result > 0 ? result : err;
1083}
1084
1085long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1086 unsigned char *buf, long count)
1087{
1088 snd_rawmidi_input_trigger(substream, 1);
1089 return snd_rawmidi_kernel_read1(substream, NULL, buf, count);
1090}
1091EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1092
1093static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1094 loff_t *offset)
1095{
1096 long result;
1097 int count1;
1098 struct snd_rawmidi_file *rfile;
1099 struct snd_rawmidi_substream *substream;
1100 struct snd_rawmidi_runtime *runtime;
1101
1102 rfile = file->private_data;
1103 substream = rfile->input;
1104 if (substream == NULL)
1105 return -EIO;
1106 runtime = substream->runtime;
1107 snd_rawmidi_input_trigger(substream, 1);
1108 result = 0;
1109 while (count > 0) {
1110 spin_lock_irq(&runtime->lock);
1111 while (!__snd_rawmidi_ready(runtime)) {
1112 wait_queue_entry_t wait;
1113
1114 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1115 spin_unlock_irq(&runtime->lock);
1116 return result > 0 ? result : -EAGAIN;
1117 }
1118 init_waitqueue_entry(&wait, current);
1119 add_wait_queue(&runtime->sleep, &wait);
1120 set_current_state(TASK_INTERRUPTIBLE);
1121 spin_unlock_irq(&runtime->lock);
1122 schedule();
1123 remove_wait_queue(&runtime->sleep, &wait);
1124 if (rfile->rmidi->card->shutdown)
1125 return -ENODEV;
1126 if (signal_pending(current))
1127 return result > 0 ? result : -ERESTARTSYS;
1128 spin_lock_irq(&runtime->lock);
1129 if (!runtime->avail) {
1130 spin_unlock_irq(&runtime->lock);
1131 return result > 0 ? result : -EIO;
1132 }
1133 }
1134 spin_unlock_irq(&runtime->lock);
1135 count1 = snd_rawmidi_kernel_read1(substream,
1136 (unsigned char __user *)buf,
1137 NULL,
1138 count);
1139 if (count1 < 0)
1140 return result > 0 ? result : count1;
1141 result += count1;
1142 buf += count1;
1143 count -= count1;
1144 }
1145 return result;
1146}
1147
1148
1149
1150
1151
1152
1153
1154int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1155{
1156 struct snd_rawmidi_runtime *runtime = substream->runtime;
1157 int result;
1158 unsigned long flags;
1159
1160 if (runtime->buffer == NULL) {
1161 rmidi_dbg(substream->rmidi,
1162 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1163 return 1;
1164 }
1165 spin_lock_irqsave(&runtime->lock, flags);
1166 result = runtime->avail >= runtime->buffer_size;
1167 spin_unlock_irqrestore(&runtime->lock, flags);
1168 return result;
1169}
1170EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1181 unsigned char *buffer, int count)
1182{
1183 int result, count1;
1184 struct snd_rawmidi_runtime *runtime = substream->runtime;
1185
1186 if (runtime->buffer == NULL) {
1187 rmidi_dbg(substream->rmidi,
1188 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1189 return -EINVAL;
1190 }
1191 result = 0;
1192 if (runtime->avail >= runtime->buffer_size) {
1193
1194 goto __skip;
1195 }
1196 if (count == 1) {
1197 *buffer = runtime->buffer[runtime->hw_ptr];
1198 result++;
1199 } else {
1200 count1 = runtime->buffer_size - runtime->hw_ptr;
1201 if (count1 > count)
1202 count1 = count;
1203 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1204 count1 = runtime->buffer_size - runtime->avail;
1205 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1206 count -= count1;
1207 result += count1;
1208 if (count > 0) {
1209 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1210 count = runtime->buffer_size - runtime->avail - count1;
1211 memcpy(buffer + count1, runtime->buffer, count);
1212 result += count;
1213 }
1214 }
1215 __skip:
1216 return result;
1217}
1218EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1235 unsigned char *buffer, int count)
1236{
1237 struct snd_rawmidi_runtime *runtime = substream->runtime;
1238 int result;
1239 unsigned long flags;
1240
1241 spin_lock_irqsave(&runtime->lock, flags);
1242 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1243 spin_unlock_irqrestore(&runtime->lock, flags);
1244 return result;
1245}
1246EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1247
1248
1249
1250
1251
1252
1253
1254
1255int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1256{
1257 struct snd_rawmidi_runtime *runtime = substream->runtime;
1258
1259 if (runtime->buffer == NULL) {
1260 rmidi_dbg(substream->rmidi,
1261 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1262 return -EINVAL;
1263 }
1264 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1265 runtime->hw_ptr += count;
1266 runtime->hw_ptr %= runtime->buffer_size;
1267 runtime->avail += count;
1268 substream->bytes += count;
1269 if (count > 0) {
1270 if (runtime->drain || __snd_rawmidi_ready(runtime))
1271 wake_up(&runtime->sleep);
1272 }
1273 return count;
1274}
1275EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1289{
1290 struct snd_rawmidi_runtime *runtime = substream->runtime;
1291 int result;
1292 unsigned long flags;
1293
1294 spin_lock_irqsave(&runtime->lock, flags);
1295 result = __snd_rawmidi_transmit_ack(substream, count);
1296 spin_unlock_irqrestore(&runtime->lock, flags);
1297 return result;
1298}
1299EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1312 unsigned char *buffer, int count)
1313{
1314 struct snd_rawmidi_runtime *runtime = substream->runtime;
1315 int result;
1316 unsigned long flags;
1317
1318 spin_lock_irqsave(&runtime->lock, flags);
1319 if (!substream->opened)
1320 result = -EBADFD;
1321 else {
1322 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1323 if (count <= 0)
1324 result = count;
1325 else
1326 result = __snd_rawmidi_transmit_ack(substream, count);
1327 }
1328 spin_unlock_irqrestore(&runtime->lock, flags);
1329 return result;
1330}
1331EXPORT_SYMBOL(snd_rawmidi_transmit);
1332
1333
1334
1335
1336
1337
1338
1339int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1340{
1341 struct snd_rawmidi_runtime *runtime = substream->runtime;
1342 unsigned long flags;
1343 int count = 0;
1344
1345 spin_lock_irqsave(&runtime->lock, flags);
1346 if (runtime->avail < runtime->buffer_size) {
1347 count = runtime->buffer_size - runtime->avail;
1348 __snd_rawmidi_transmit_ack(substream, count);
1349 }
1350 spin_unlock_irqrestore(&runtime->lock, flags);
1351 return count;
1352}
1353EXPORT_SYMBOL(snd_rawmidi_proceed);
1354
1355static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1356 const unsigned char __user *userbuf,
1357 const unsigned char *kernelbuf,
1358 long count)
1359{
1360 unsigned long flags;
1361 long count1, result;
1362 struct snd_rawmidi_runtime *runtime = substream->runtime;
1363 unsigned long appl_ptr;
1364
1365 if (!kernelbuf && !userbuf)
1366 return -EINVAL;
1367 if (snd_BUG_ON(!runtime->buffer))
1368 return -EINVAL;
1369
1370 result = 0;
1371 spin_lock_irqsave(&runtime->lock, flags);
1372 if (substream->append) {
1373 if ((long)runtime->avail < count) {
1374 spin_unlock_irqrestore(&runtime->lock, flags);
1375 return -EAGAIN;
1376 }
1377 }
1378 snd_rawmidi_buffer_ref(runtime);
1379 while (count > 0 && runtime->avail > 0) {
1380 count1 = runtime->buffer_size - runtime->appl_ptr;
1381 if (count1 > count)
1382 count1 = count;
1383 if (count1 > (long)runtime->avail)
1384 count1 = runtime->avail;
1385
1386
1387 appl_ptr = runtime->appl_ptr;
1388 runtime->appl_ptr += count1;
1389 runtime->appl_ptr %= runtime->buffer_size;
1390 runtime->avail -= count1;
1391
1392 if (kernelbuf)
1393 memcpy(runtime->buffer + appl_ptr,
1394 kernelbuf + result, count1);
1395 else if (userbuf) {
1396 spin_unlock_irqrestore(&runtime->lock, flags);
1397 if (copy_from_user(runtime->buffer + appl_ptr,
1398 userbuf + result, count1)) {
1399 spin_lock_irqsave(&runtime->lock, flags);
1400 result = result > 0 ? result : -EFAULT;
1401 goto __end;
1402 }
1403 spin_lock_irqsave(&runtime->lock, flags);
1404 }
1405 result += count1;
1406 count -= count1;
1407 }
1408 __end:
1409 count1 = runtime->avail < runtime->buffer_size;
1410 snd_rawmidi_buffer_unref(runtime);
1411 spin_unlock_irqrestore(&runtime->lock, flags);
1412 if (count1)
1413 snd_rawmidi_output_trigger(substream, 1);
1414 return result;
1415}
1416
1417long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1418 const unsigned char *buf, long count)
1419{
1420 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1421}
1422EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1423
1424static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1425 size_t count, loff_t *offset)
1426{
1427 long result, timeout;
1428 int count1;
1429 struct snd_rawmidi_file *rfile;
1430 struct snd_rawmidi_runtime *runtime;
1431 struct snd_rawmidi_substream *substream;
1432
1433 rfile = file->private_data;
1434 substream = rfile->output;
1435 runtime = substream->runtime;
1436
1437 if (substream->append && count > runtime->buffer_size)
1438 return -EIO;
1439 result = 0;
1440 while (count > 0) {
1441 spin_lock_irq(&runtime->lock);
1442 while (!snd_rawmidi_ready_append(substream, count)) {
1443 wait_queue_entry_t wait;
1444
1445 if (file->f_flags & O_NONBLOCK) {
1446 spin_unlock_irq(&runtime->lock);
1447 return result > 0 ? result : -EAGAIN;
1448 }
1449 init_waitqueue_entry(&wait, current);
1450 add_wait_queue(&runtime->sleep, &wait);
1451 set_current_state(TASK_INTERRUPTIBLE);
1452 spin_unlock_irq(&runtime->lock);
1453 timeout = schedule_timeout(30 * HZ);
1454 remove_wait_queue(&runtime->sleep, &wait);
1455 if (rfile->rmidi->card->shutdown)
1456 return -ENODEV;
1457 if (signal_pending(current))
1458 return result > 0 ? result : -ERESTARTSYS;
1459 spin_lock_irq(&runtime->lock);
1460 if (!runtime->avail && !timeout) {
1461 spin_unlock_irq(&runtime->lock);
1462 return result > 0 ? result : -EIO;
1463 }
1464 }
1465 spin_unlock_irq(&runtime->lock);
1466 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1467 if (count1 < 0)
1468 return result > 0 ? result : count1;
1469 result += count1;
1470 buf += count1;
1471 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1472 break;
1473 count -= count1;
1474 }
1475 if (file->f_flags & O_DSYNC) {
1476 spin_lock_irq(&runtime->lock);
1477 while (runtime->avail != runtime->buffer_size) {
1478 wait_queue_entry_t wait;
1479 unsigned int last_avail = runtime->avail;
1480
1481 init_waitqueue_entry(&wait, current);
1482 add_wait_queue(&runtime->sleep, &wait);
1483 set_current_state(TASK_INTERRUPTIBLE);
1484 spin_unlock_irq(&runtime->lock);
1485 timeout = schedule_timeout(30 * HZ);
1486 remove_wait_queue(&runtime->sleep, &wait);
1487 if (signal_pending(current))
1488 return result > 0 ? result : -ERESTARTSYS;
1489 if (runtime->avail == last_avail && !timeout)
1490 return result > 0 ? result : -EIO;
1491 spin_lock_irq(&runtime->lock);
1492 }
1493 spin_unlock_irq(&runtime->lock);
1494 }
1495 return result;
1496}
1497
1498static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1499{
1500 struct snd_rawmidi_file *rfile;
1501 struct snd_rawmidi_runtime *runtime;
1502 __poll_t mask;
1503
1504 rfile = file->private_data;
1505 if (rfile->input != NULL) {
1506 runtime = rfile->input->runtime;
1507 snd_rawmidi_input_trigger(rfile->input, 1);
1508 poll_wait(file, &runtime->sleep, wait);
1509 }
1510 if (rfile->output != NULL) {
1511 runtime = rfile->output->runtime;
1512 poll_wait(file, &runtime->sleep, wait);
1513 }
1514 mask = 0;
1515 if (rfile->input != NULL) {
1516 if (snd_rawmidi_ready(rfile->input))
1517 mask |= EPOLLIN | EPOLLRDNORM;
1518 }
1519 if (rfile->output != NULL) {
1520 if (snd_rawmidi_ready(rfile->output))
1521 mask |= EPOLLOUT | EPOLLWRNORM;
1522 }
1523 return mask;
1524}
1525
1526
1527
1528#ifdef CONFIG_COMPAT
1529#include "rawmidi_compat.c"
1530#else
1531#define snd_rawmidi_ioctl_compat NULL
1532#endif
1533
1534
1535
1536
1537static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1538 struct snd_info_buffer *buffer)
1539{
1540 struct snd_rawmidi *rmidi;
1541 struct snd_rawmidi_substream *substream;
1542 struct snd_rawmidi_runtime *runtime;
1543 unsigned long buffer_size, avail, xruns;
1544
1545 rmidi = entry->private_data;
1546 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1547 mutex_lock(&rmidi->open_mutex);
1548 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1549 list_for_each_entry(substream,
1550 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1551 list) {
1552 snd_iprintf(buffer,
1553 "Output %d\n"
1554 " Tx bytes : %lu\n",
1555 substream->number,
1556 (unsigned long) substream->bytes);
1557 if (substream->opened) {
1558 snd_iprintf(buffer,
1559 " Owner PID : %d\n",
1560 pid_vnr(substream->pid));
1561 runtime = substream->runtime;
1562 spin_lock_irq(&runtime->lock);
1563 buffer_size = runtime->buffer_size;
1564 avail = runtime->avail;
1565 spin_unlock_irq(&runtime->lock);
1566 snd_iprintf(buffer,
1567 " Mode : %s\n"
1568 " Buffer size : %lu\n"
1569 " Avail : %lu\n",
1570 runtime->oss ? "OSS compatible" : "native",
1571 buffer_size, avail);
1572 }
1573 }
1574 }
1575 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1576 list_for_each_entry(substream,
1577 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1578 list) {
1579 snd_iprintf(buffer,
1580 "Input %d\n"
1581 " Rx bytes : %lu\n",
1582 substream->number,
1583 (unsigned long) substream->bytes);
1584 if (substream->opened) {
1585 snd_iprintf(buffer,
1586 " Owner PID : %d\n",
1587 pid_vnr(substream->pid));
1588 runtime = substream->runtime;
1589 spin_lock_irq(&runtime->lock);
1590 buffer_size = runtime->buffer_size;
1591 avail = runtime->avail;
1592 xruns = runtime->xruns;
1593 spin_unlock_irq(&runtime->lock);
1594 snd_iprintf(buffer,
1595 " Buffer size : %lu\n"
1596 " Avail : %lu\n"
1597 " Overruns : %lu\n",
1598 buffer_size, avail, xruns);
1599 }
1600 }
1601 }
1602 mutex_unlock(&rmidi->open_mutex);
1603}
1604
1605
1606
1607
1608
1609static const struct file_operations snd_rawmidi_f_ops = {
1610 .owner = THIS_MODULE,
1611 .read = snd_rawmidi_read,
1612 .write = snd_rawmidi_write,
1613 .open = snd_rawmidi_open,
1614 .release = snd_rawmidi_release,
1615 .llseek = no_llseek,
1616 .poll = snd_rawmidi_poll,
1617 .unlocked_ioctl = snd_rawmidi_ioctl,
1618 .compat_ioctl = snd_rawmidi_ioctl_compat,
1619};
1620
1621static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1622 struct snd_rawmidi_str *stream,
1623 int direction,
1624 int count)
1625{
1626 struct snd_rawmidi_substream *substream;
1627 int idx;
1628
1629 for (idx = 0; idx < count; idx++) {
1630 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1631 if (!substream)
1632 return -ENOMEM;
1633 substream->stream = direction;
1634 substream->number = idx;
1635 substream->rmidi = rmidi;
1636 substream->pstr = stream;
1637 list_add_tail(&substream->list, &stream->substreams);
1638 stream->substream_count++;
1639 }
1640 return 0;
1641}
1642
1643static void release_rawmidi_device(struct device *dev)
1644{
1645 kfree(container_of(dev, struct snd_rawmidi, dev));
1646}
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1663 int output_count, int input_count,
1664 struct snd_rawmidi **rrawmidi)
1665{
1666 struct snd_rawmidi *rmidi;
1667 int err;
1668 static const struct snd_device_ops ops = {
1669 .dev_free = snd_rawmidi_dev_free,
1670 .dev_register = snd_rawmidi_dev_register,
1671 .dev_disconnect = snd_rawmidi_dev_disconnect,
1672 };
1673
1674 if (snd_BUG_ON(!card))
1675 return -ENXIO;
1676 if (rrawmidi)
1677 *rrawmidi = NULL;
1678 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1679 if (!rmidi)
1680 return -ENOMEM;
1681 rmidi->card = card;
1682 rmidi->device = device;
1683 mutex_init(&rmidi->open_mutex);
1684 init_waitqueue_head(&rmidi->open_wait);
1685 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1686 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1687
1688 if (id != NULL)
1689 strscpy(rmidi->id, id, sizeof(rmidi->id));
1690
1691 snd_device_initialize(&rmidi->dev, card);
1692 rmidi->dev.release = release_rawmidi_device;
1693 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1694
1695 err = snd_rawmidi_alloc_substreams(rmidi,
1696 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1697 SNDRV_RAWMIDI_STREAM_INPUT,
1698 input_count);
1699 if (err < 0)
1700 goto error;
1701 err = snd_rawmidi_alloc_substreams(rmidi,
1702 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1703 SNDRV_RAWMIDI_STREAM_OUTPUT,
1704 output_count);
1705 if (err < 0)
1706 goto error;
1707 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1708 if (err < 0)
1709 goto error;
1710
1711 if (rrawmidi)
1712 *rrawmidi = rmidi;
1713 return 0;
1714
1715 error:
1716 snd_rawmidi_free(rmidi);
1717 return err;
1718}
1719EXPORT_SYMBOL(snd_rawmidi_new);
1720
1721static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1722{
1723 struct snd_rawmidi_substream *substream;
1724
1725 while (!list_empty(&stream->substreams)) {
1726 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1727 list_del(&substream->list);
1728 kfree(substream);
1729 }
1730}
1731
1732static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1733{
1734 if (!rmidi)
1735 return 0;
1736
1737 snd_info_free_entry(rmidi->proc_entry);
1738 rmidi->proc_entry = NULL;
1739 mutex_lock(®ister_mutex);
1740 if (rmidi->ops && rmidi->ops->dev_unregister)
1741 rmidi->ops->dev_unregister(rmidi);
1742 mutex_unlock(®ister_mutex);
1743
1744 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1745 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1746 if (rmidi->private_free)
1747 rmidi->private_free(rmidi);
1748 put_device(&rmidi->dev);
1749 return 0;
1750}
1751
1752static int snd_rawmidi_dev_free(struct snd_device *device)
1753{
1754 struct snd_rawmidi *rmidi = device->device_data;
1755
1756 return snd_rawmidi_free(rmidi);
1757}
1758
1759#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1760static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1761{
1762 struct snd_rawmidi *rmidi = device->private_data;
1763
1764 rmidi->seq_dev = NULL;
1765}
1766#endif
1767
1768static int snd_rawmidi_dev_register(struct snd_device *device)
1769{
1770 int err;
1771 struct snd_info_entry *entry;
1772 char name[16];
1773 struct snd_rawmidi *rmidi = device->device_data;
1774
1775 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1776 return -ENOMEM;
1777 err = 0;
1778 mutex_lock(®ister_mutex);
1779 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1780 err = -EBUSY;
1781 else
1782 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1783 mutex_unlock(®ister_mutex);
1784 if (err < 0)
1785 return err;
1786
1787 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1788 rmidi->card, rmidi->device,
1789 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1790 if (err < 0) {
1791 rmidi_err(rmidi, "unable to register\n");
1792 goto error;
1793 }
1794 if (rmidi->ops && rmidi->ops->dev_register) {
1795 err = rmidi->ops->dev_register(rmidi);
1796 if (err < 0)
1797 goto error_unregister;
1798 }
1799#ifdef CONFIG_SND_OSSEMUL
1800 rmidi->ossreg = 0;
1801 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1802 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1803 rmidi->card, 0, &snd_rawmidi_f_ops,
1804 rmidi) < 0) {
1805 rmidi_err(rmidi,
1806 "unable to register OSS rawmidi device %i:%i\n",
1807 rmidi->card->number, 0);
1808 } else {
1809 rmidi->ossreg++;
1810#ifdef SNDRV_OSS_INFO_DEV_MIDI
1811 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1812#endif
1813 }
1814 }
1815 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1816 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1817 rmidi->card, 1, &snd_rawmidi_f_ops,
1818 rmidi) < 0) {
1819 rmidi_err(rmidi,
1820 "unable to register OSS rawmidi device %i:%i\n",
1821 rmidi->card->number, 1);
1822 } else {
1823 rmidi->ossreg++;
1824 }
1825 }
1826#endif
1827 sprintf(name, "midi%d", rmidi->device);
1828 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1829 if (entry) {
1830 entry->private_data = rmidi;
1831 entry->c.text.read = snd_rawmidi_proc_info_read;
1832 if (snd_info_register(entry) < 0) {
1833 snd_info_free_entry(entry);
1834 entry = NULL;
1835 }
1836 }
1837 rmidi->proc_entry = entry;
1838#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1839 if (!rmidi->ops || !rmidi->ops->dev_register) {
1840 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1841 rmidi->seq_dev->private_data = rmidi;
1842 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1843 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1844 snd_device_register(rmidi->card, rmidi->seq_dev);
1845 }
1846 }
1847#endif
1848 return 0;
1849
1850 error_unregister:
1851 snd_unregister_device(&rmidi->dev);
1852 error:
1853 mutex_lock(®ister_mutex);
1854 list_del(&rmidi->list);
1855 mutex_unlock(®ister_mutex);
1856 return err;
1857}
1858
1859static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1860{
1861 struct snd_rawmidi *rmidi = device->device_data;
1862 int dir;
1863
1864 mutex_lock(®ister_mutex);
1865 mutex_lock(&rmidi->open_mutex);
1866 wake_up(&rmidi->open_wait);
1867 list_del_init(&rmidi->list);
1868 for (dir = 0; dir < 2; dir++) {
1869 struct snd_rawmidi_substream *s;
1870
1871 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1872 if (s->runtime)
1873 wake_up(&s->runtime->sleep);
1874 }
1875 }
1876
1877#ifdef CONFIG_SND_OSSEMUL
1878 if (rmidi->ossreg) {
1879 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1880 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1881#ifdef SNDRV_OSS_INFO_DEV_MIDI
1882 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1883#endif
1884 }
1885 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1886 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1887 rmidi->ossreg = 0;
1888 }
1889#endif
1890 snd_unregister_device(&rmidi->dev);
1891 mutex_unlock(&rmidi->open_mutex);
1892 mutex_unlock(®ister_mutex);
1893 return 0;
1894}
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1905 const struct snd_rawmidi_ops *ops)
1906{
1907 struct snd_rawmidi_substream *substream;
1908
1909 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1910 substream->ops = ops;
1911}
1912EXPORT_SYMBOL(snd_rawmidi_set_ops);
1913
1914
1915
1916
1917
1918static int __init alsa_rawmidi_init(void)
1919{
1920
1921 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1922 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1923#ifdef CONFIG_SND_OSSEMUL
1924 { int i;
1925
1926 for (i = 0; i < SNDRV_CARDS; i++) {
1927 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1928 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1929 i, midi_map[i]);
1930 midi_map[i] = 0;
1931 }
1932 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1933 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1934 i, amidi_map[i]);
1935 amidi_map[i] = 1;
1936 }
1937 }
1938 }
1939#endif
1940 return 0;
1941}
1942
1943static void __exit alsa_rawmidi_exit(void)
1944{
1945 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1946 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1947}
1948
1949module_init(alsa_rawmidi_init)
1950module_exit(alsa_rawmidi_exit)
1951
