1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Abstract layer for MIDI v1.0 stream
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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>
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>
25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
26 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
27 MODULE_LICENSE("GPL");
29 #ifdef CONFIG_SND_OSSEMUL
30 static int midi_map[SNDRV_CARDS];
31 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
32 module_param_array(midi_map, int, NULL, 0444);
33 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
34 module_param_array(amidi_map, int, NULL, 0444);
35 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
36 #endif /* CONFIG_SND_OSSEMUL */
38 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
39 static int snd_rawmidi_dev_free(struct snd_device *device);
40 static int snd_rawmidi_dev_register(struct snd_device *device);
41 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
43 static LIST_HEAD(snd_rawmidi_devices);
44 static DEFINE_MUTEX(register_mutex);
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)
53 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
55 struct snd_rawmidi *rawmidi;
57 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
58 if (rawmidi->card == card && rawmidi->device == device)
63 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
65 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
67 return SNDRV_RAWMIDI_LFLG_OUTPUT;
69 return SNDRV_RAWMIDI_LFLG_INPUT;
71 return SNDRV_RAWMIDI_LFLG_OPEN;
75 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
77 struct snd_rawmidi_runtime *runtime = substream->runtime;
79 return runtime->avail >= runtime->avail_min;
82 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
85 struct snd_rawmidi_runtime *runtime = substream->runtime;
87 return runtime->avail >= runtime->avail_min &&
88 (!substream->append || runtime->avail >= count);
91 static void snd_rawmidi_input_event_work(struct work_struct *work)
93 struct snd_rawmidi_runtime *runtime =
94 container_of(work, struct snd_rawmidi_runtime, event_work);
97 runtime->event(runtime->substream);
100 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
102 struct snd_rawmidi_runtime *runtime;
104 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
107 runtime->substream = substream;
108 spin_lock_init(&runtime->lock);
109 init_waitqueue_head(&runtime->sleep);
110 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
111 runtime->event = NULL;
112 runtime->buffer_size = PAGE_SIZE;
113 runtime->avail_min = 1;
114 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
117 runtime->avail = runtime->buffer_size;
118 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
119 if (!runtime->buffer) {
123 runtime->appl_ptr = runtime->hw_ptr = 0;
124 substream->runtime = runtime;
128 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
130 struct snd_rawmidi_runtime *runtime = substream->runtime;
132 kvfree(runtime->buffer);
134 substream->runtime = NULL;
138 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
140 if (!substream->opened)
142 substream->ops->trigger(substream, up);
145 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
147 if (!substream->opened)
149 substream->ops->trigger(substream, up);
151 cancel_work_sync(&substream->runtime->event_work);
154 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
158 runtime->appl_ptr = runtime->hw_ptr = 0;
159 runtime->avail = is_input ? 0 : runtime->buffer_size;
162 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
167 spin_lock_irqsave(&runtime->lock, flags);
168 __reset_runtime_ptrs(runtime, is_input);
169 spin_unlock_irqrestore(&runtime->lock, flags);
172 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
174 snd_rawmidi_output_trigger(substream, 0);
175 reset_runtime_ptrs(substream->runtime, false);
178 EXPORT_SYMBOL(snd_rawmidi_drop_output);
180 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
184 struct snd_rawmidi_runtime *runtime = substream->runtime;
188 timeout = wait_event_interruptible_timeout(runtime->sleep,
189 (runtime->avail >= runtime->buffer_size),
191 if (signal_pending(current))
193 if (runtime->avail < runtime->buffer_size && !timeout) {
194 rmidi_warn(substream->rmidi,
195 "rawmidi drain error (avail = %li, buffer_size = %li)\n",
196 (long)runtime->avail, (long)runtime->buffer_size);
200 if (err != -ERESTARTSYS) {
201 /* we need wait a while to make sure that Tx FIFOs are empty */
202 if (substream->ops->drain)
203 substream->ops->drain(substream);
206 snd_rawmidi_drop_output(substream);
210 EXPORT_SYMBOL(snd_rawmidi_drain_output);
212 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
214 snd_rawmidi_input_trigger(substream, 0);
215 reset_runtime_ptrs(substream->runtime, true);
218 EXPORT_SYMBOL(snd_rawmidi_drain_input);
220 /* look for an available substream for the given stream direction;
221 * if a specific subdevice is given, try to assign it
223 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
224 int stream, int mode,
225 struct snd_rawmidi_substream **sub_ret)
227 struct snd_rawmidi_substream *substream;
228 struct snd_rawmidi_str *s = &rmidi->streams[stream];
229 static unsigned int info_flags[2] = {
230 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
231 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
234 if (!(rmidi->info_flags & info_flags[stream]))
236 if (subdevice >= 0 && subdevice >= s->substream_count)
239 list_for_each_entry(substream, &s->substreams, list) {
240 if (substream->opened) {
241 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
242 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
246 if (subdevice < 0 || subdevice == substream->number) {
247 *sub_ret = substream;
254 /* open and do ref-counting for the given substream */
255 static int open_substream(struct snd_rawmidi *rmidi,
256 struct snd_rawmidi_substream *substream,
261 if (substream->use_count == 0) {
262 err = snd_rawmidi_runtime_create(substream);
265 err = substream->ops->open(substream);
267 snd_rawmidi_runtime_free(substream);
270 substream->opened = 1;
271 substream->active_sensing = 0;
272 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
273 substream->append = 1;
274 substream->pid = get_pid(task_pid(current));
275 rmidi->streams[substream->stream].substream_opened++;
277 substream->use_count++;
281 static void close_substream(struct snd_rawmidi *rmidi,
282 struct snd_rawmidi_substream *substream,
285 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
286 struct snd_rawmidi_file *rfile)
288 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
291 rfile->input = rfile->output = NULL;
292 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
293 err = assign_substream(rmidi, subdevice,
294 SNDRV_RAWMIDI_STREAM_INPUT,
299 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
300 err = assign_substream(rmidi, subdevice,
301 SNDRV_RAWMIDI_STREAM_OUTPUT,
308 err = open_substream(rmidi, sinput, mode);
313 err = open_substream(rmidi, soutput, mode);
316 close_substream(rmidi, sinput, 0);
321 rfile->rmidi = rmidi;
322 rfile->input = sinput;
323 rfile->output = soutput;
327 /* called from sound/core/seq/seq_midi.c */
328 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
329 int mode, struct snd_rawmidi_file *rfile)
331 struct snd_rawmidi *rmidi;
334 if (snd_BUG_ON(!rfile))
337 mutex_lock(®ister_mutex);
338 rmidi = snd_rawmidi_search(card, device);
341 else if (!try_module_get(rmidi->card->module))
343 mutex_unlock(®ister_mutex);
347 mutex_lock(&rmidi->open_mutex);
348 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
349 mutex_unlock(&rmidi->open_mutex);
351 module_put(rmidi->card->module);
354 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
356 static int snd_rawmidi_open(struct inode *inode, struct file *file)
358 int maj = imajor(inode);
359 struct snd_card *card;
361 unsigned short fflags;
363 struct snd_rawmidi *rmidi;
364 struct snd_rawmidi_file *rawmidi_file = NULL;
365 wait_queue_entry_t wait;
367 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
368 return -EINVAL; /* invalid combination */
370 err = stream_open(inode, file);
374 if (maj == snd_major) {
375 rmidi = snd_lookup_minor_data(iminor(inode),
376 SNDRV_DEVICE_TYPE_RAWMIDI);
377 #ifdef CONFIG_SND_OSSEMUL
378 } else if (maj == SOUND_MAJOR) {
379 rmidi = snd_lookup_oss_minor_data(iminor(inode),
380 SNDRV_OSS_DEVICE_TYPE_MIDI);
388 if (!try_module_get(rmidi->card->module)) {
389 snd_card_unref(rmidi->card);
393 mutex_lock(&rmidi->open_mutex);
395 err = snd_card_file_add(card, file);
398 fflags = snd_rawmidi_file_flags(file);
399 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
400 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
401 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
402 if (rawmidi_file == NULL) {
406 init_waitqueue_entry(&wait, current);
407 add_wait_queue(&rmidi->open_wait, &wait);
409 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
410 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
413 if (err == -EAGAIN) {
414 if (file->f_flags & O_NONBLOCK) {
420 set_current_state(TASK_INTERRUPTIBLE);
421 mutex_unlock(&rmidi->open_mutex);
423 mutex_lock(&rmidi->open_mutex);
424 if (rmidi->card->shutdown) {
428 if (signal_pending(current)) {
433 remove_wait_queue(&rmidi->open_wait, &wait);
438 #ifdef CONFIG_SND_OSSEMUL
439 if (rawmidi_file->input && rawmidi_file->input->runtime)
440 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
441 if (rawmidi_file->output && rawmidi_file->output->runtime)
442 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
444 file->private_data = rawmidi_file;
445 mutex_unlock(&rmidi->open_mutex);
446 snd_card_unref(rmidi->card);
450 snd_card_file_remove(card, file);
452 mutex_unlock(&rmidi->open_mutex);
453 module_put(rmidi->card->module);
454 snd_card_unref(rmidi->card);
458 static void close_substream(struct snd_rawmidi *rmidi,
459 struct snd_rawmidi_substream *substream,
462 if (--substream->use_count)
466 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
467 snd_rawmidi_input_trigger(substream, 0);
469 if (substream->active_sensing) {
470 unsigned char buf = 0xfe;
471 /* sending single active sensing message
472 * to shut the device up
474 snd_rawmidi_kernel_write(substream, &buf, 1);
476 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
477 snd_rawmidi_output_trigger(substream, 0);
480 substream->ops->close(substream);
481 if (substream->runtime->private_free)
482 substream->runtime->private_free(substream);
483 snd_rawmidi_runtime_free(substream);
484 substream->opened = 0;
485 substream->append = 0;
486 put_pid(substream->pid);
487 substream->pid = NULL;
488 rmidi->streams[substream->stream].substream_opened--;
491 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
493 struct snd_rawmidi *rmidi;
495 rmidi = rfile->rmidi;
496 mutex_lock(&rmidi->open_mutex);
498 close_substream(rmidi, rfile->input, 1);
502 close_substream(rmidi, rfile->output, 1);
503 rfile->output = NULL;
506 mutex_unlock(&rmidi->open_mutex);
507 wake_up(&rmidi->open_wait);
510 /* called from sound/core/seq/seq_midi.c */
511 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
513 struct snd_rawmidi *rmidi;
515 if (snd_BUG_ON(!rfile))
518 rmidi = rfile->rmidi;
519 rawmidi_release_priv(rfile);
520 module_put(rmidi->card->module);
523 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
525 static int snd_rawmidi_release(struct inode *inode, struct file *file)
527 struct snd_rawmidi_file *rfile;
528 struct snd_rawmidi *rmidi;
529 struct module *module;
531 rfile = file->private_data;
532 rmidi = rfile->rmidi;
533 rawmidi_release_priv(rfile);
535 module = rmidi->card->module;
536 snd_card_file_remove(rmidi->card, file);
541 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
542 struct snd_rawmidi_info *info)
544 struct snd_rawmidi *rmidi;
546 if (substream == NULL)
548 rmidi = substream->rmidi;
549 memset(info, 0, sizeof(*info));
550 info->card = rmidi->card->number;
551 info->device = rmidi->device;
552 info->subdevice = substream->number;
553 info->stream = substream->stream;
554 info->flags = rmidi->info_flags;
555 strcpy(info->id, rmidi->id);
556 strcpy(info->name, rmidi->name);
557 strcpy(info->subname, substream->name);
558 info->subdevices_count = substream->pstr->substream_count;
559 info->subdevices_avail = (substream->pstr->substream_count -
560 substream->pstr->substream_opened);
564 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
565 struct snd_rawmidi_info __user *_info)
567 struct snd_rawmidi_info info;
570 err = snd_rawmidi_info(substream, &info);
573 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
578 static int __snd_rawmidi_info_select(struct snd_card *card,
579 struct snd_rawmidi_info *info)
581 struct snd_rawmidi *rmidi;
582 struct snd_rawmidi_str *pstr;
583 struct snd_rawmidi_substream *substream;
585 rmidi = snd_rawmidi_search(card, info->device);
588 if (info->stream < 0 || info->stream > 1)
590 info->stream = array_index_nospec(info->stream, 2);
591 pstr = &rmidi->streams[info->stream];
592 if (pstr->substream_count == 0)
594 if (info->subdevice >= pstr->substream_count)
596 list_for_each_entry(substream, &pstr->substreams, list) {
597 if ((unsigned int)substream->number == info->subdevice)
598 return snd_rawmidi_info(substream, info);
603 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
607 mutex_lock(®ister_mutex);
608 ret = __snd_rawmidi_info_select(card, info);
609 mutex_unlock(®ister_mutex);
612 EXPORT_SYMBOL(snd_rawmidi_info_select);
614 static int snd_rawmidi_info_select_user(struct snd_card *card,
615 struct snd_rawmidi_info __user *_info)
618 struct snd_rawmidi_info info;
620 if (get_user(info.device, &_info->device))
622 if (get_user(info.stream, &_info->stream))
624 if (get_user(info.subdevice, &_info->subdevice))
626 err = snd_rawmidi_info_select(card, &info);
629 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
634 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
635 struct snd_rawmidi_params *params,
638 char *newbuf, *oldbuf;
640 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
642 if (params->avail_min < 1 || params->avail_min > params->buffer_size)
644 if (params->buffer_size != runtime->buffer_size) {
645 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
648 spin_lock_irq(&runtime->lock);
649 oldbuf = runtime->buffer;
650 runtime->buffer = newbuf;
651 runtime->buffer_size = params->buffer_size;
652 __reset_runtime_ptrs(runtime, is_input);
653 spin_unlock_irq(&runtime->lock);
656 runtime->avail_min = params->avail_min;
660 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
661 struct snd_rawmidi_params *params)
663 if (substream->append && substream->use_count > 1)
665 snd_rawmidi_drain_output(substream);
666 substream->active_sensing = !params->no_active_sensing;
667 return resize_runtime_buffer(substream->runtime, params, false);
669 EXPORT_SYMBOL(snd_rawmidi_output_params);
671 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
672 struct snd_rawmidi_params *params)
674 snd_rawmidi_drain_input(substream);
675 return resize_runtime_buffer(substream->runtime, params, true);
677 EXPORT_SYMBOL(snd_rawmidi_input_params);
679 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
680 struct snd_rawmidi_status *status)
682 struct snd_rawmidi_runtime *runtime = substream->runtime;
684 memset(status, 0, sizeof(*status));
685 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
686 spin_lock_irq(&runtime->lock);
687 status->avail = runtime->avail;
688 spin_unlock_irq(&runtime->lock);
692 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
693 struct snd_rawmidi_status *status)
695 struct snd_rawmidi_runtime *runtime = substream->runtime;
697 memset(status, 0, sizeof(*status));
698 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
699 spin_lock_irq(&runtime->lock);
700 status->avail = runtime->avail;
701 status->xruns = runtime->xruns;
703 spin_unlock_irq(&runtime->lock);
707 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
709 struct snd_rawmidi_file *rfile;
710 void __user *argp = (void __user *)arg;
712 rfile = file->private_data;
713 if (((cmd >> 8) & 0xff) != 'W')
716 case SNDRV_RAWMIDI_IOCTL_PVERSION:
717 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
718 case SNDRV_RAWMIDI_IOCTL_INFO:
721 struct snd_rawmidi_info __user *info = argp;
723 if (get_user(stream, &info->stream))
726 case SNDRV_RAWMIDI_STREAM_INPUT:
727 return snd_rawmidi_info_user(rfile->input, info);
728 case SNDRV_RAWMIDI_STREAM_OUTPUT:
729 return snd_rawmidi_info_user(rfile->output, info);
734 case SNDRV_RAWMIDI_IOCTL_PARAMS:
736 struct snd_rawmidi_params params;
738 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
740 switch (params.stream) {
741 case SNDRV_RAWMIDI_STREAM_OUTPUT:
742 if (rfile->output == NULL)
744 return snd_rawmidi_output_params(rfile->output, ¶ms);
745 case SNDRV_RAWMIDI_STREAM_INPUT:
746 if (rfile->input == NULL)
748 return snd_rawmidi_input_params(rfile->input, ¶ms);
753 case SNDRV_RAWMIDI_IOCTL_STATUS:
756 struct snd_rawmidi_status status;
758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
760 switch (status.stream) {
761 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762 if (rfile->output == NULL)
764 err = snd_rawmidi_output_status(rfile->output, &status);
766 case SNDRV_RAWMIDI_STREAM_INPUT:
767 if (rfile->input == NULL)
769 err = snd_rawmidi_input_status(rfile->input, &status);
776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
780 case SNDRV_RAWMIDI_IOCTL_DROP:
784 if (get_user(val, (int __user *) argp))
787 case SNDRV_RAWMIDI_STREAM_OUTPUT:
788 if (rfile->output == NULL)
790 return snd_rawmidi_drop_output(rfile->output);
795 case SNDRV_RAWMIDI_IOCTL_DRAIN:
799 if (get_user(val, (int __user *) argp))
802 case SNDRV_RAWMIDI_STREAM_OUTPUT:
803 if (rfile->output == NULL)
805 return snd_rawmidi_drain_output(rfile->output);
806 case SNDRV_RAWMIDI_STREAM_INPUT:
807 if (rfile->input == NULL)
809 return snd_rawmidi_drain_input(rfile->input);
815 rmidi_dbg(rfile->rmidi,
816 "rawmidi: unknown command = 0x%x\n", cmd);
821 static int snd_rawmidi_control_ioctl(struct snd_card *card,
822 struct snd_ctl_file *control,
826 void __user *argp = (void __user *)arg;
829 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
833 if (get_user(device, (int __user *)argp))
835 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
836 device = SNDRV_RAWMIDI_DEVICES - 1;
837 mutex_lock(®ister_mutex);
838 device = device < 0 ? 0 : device + 1;
839 while (device < SNDRV_RAWMIDI_DEVICES) {
840 if (snd_rawmidi_search(card, device))
844 if (device == SNDRV_RAWMIDI_DEVICES)
846 mutex_unlock(®ister_mutex);
847 if (put_user(device, (int __user *)argp))
851 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
855 if (get_user(val, (int __user *)argp))
857 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
860 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
861 return snd_rawmidi_info_select_user(card, argp);
867 * snd_rawmidi_receive - receive the input data from the device
868 * @substream: the rawmidi substream
869 * @buffer: the buffer pointer
870 * @count: the data size to read
872 * Reads the data from the internal buffer.
874 * Return: The size of read data, or a negative error code on failure.
876 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
877 const unsigned char *buffer, int count)
880 int result = 0, count1;
881 struct snd_rawmidi_runtime *runtime = substream->runtime;
883 if (!substream->opened)
885 if (runtime->buffer == NULL) {
886 rmidi_dbg(substream->rmidi,
887 "snd_rawmidi_receive: input is not active!!!\n");
890 spin_lock_irqsave(&runtime->lock, flags);
891 if (count == 1) { /* special case, faster code */
893 if (runtime->avail < runtime->buffer_size) {
894 runtime->buffer[runtime->hw_ptr++] = buffer[0];
895 runtime->hw_ptr %= runtime->buffer_size;
902 substream->bytes += count;
903 count1 = runtime->buffer_size - runtime->hw_ptr;
906 if (count1 > (int)(runtime->buffer_size - runtime->avail))
907 count1 = runtime->buffer_size - runtime->avail;
908 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
909 runtime->hw_ptr += count1;
910 runtime->hw_ptr %= runtime->buffer_size;
911 runtime->avail += count1;
917 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
918 count1 = runtime->buffer_size - runtime->avail;
919 runtime->xruns += count - count1;
922 memcpy(runtime->buffer, buffer, count1);
923 runtime->hw_ptr = count1;
924 runtime->avail += count1;
931 schedule_work(&runtime->event_work);
932 else if (snd_rawmidi_ready(substream))
933 wake_up(&runtime->sleep);
935 spin_unlock_irqrestore(&runtime->lock, flags);
938 EXPORT_SYMBOL(snd_rawmidi_receive);
940 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
941 unsigned char __user *userbuf,
942 unsigned char *kernelbuf, long count)
945 long result = 0, count1;
946 struct snd_rawmidi_runtime *runtime = substream->runtime;
947 unsigned long appl_ptr;
949 spin_lock_irqsave(&runtime->lock, flags);
950 while (count > 0 && runtime->avail) {
951 count1 = runtime->buffer_size - runtime->appl_ptr;
954 if (count1 > (int)runtime->avail)
955 count1 = runtime->avail;
957 /* update runtime->appl_ptr before unlocking for userbuf */
958 appl_ptr = runtime->appl_ptr;
959 runtime->appl_ptr += count1;
960 runtime->appl_ptr %= runtime->buffer_size;
961 runtime->avail -= count1;
964 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
966 spin_unlock_irqrestore(&runtime->lock, flags);
967 if (copy_to_user(userbuf + result,
968 runtime->buffer + appl_ptr, count1)) {
969 return result > 0 ? result : -EFAULT;
971 spin_lock_irqsave(&runtime->lock, flags);
976 spin_unlock_irqrestore(&runtime->lock, flags);
980 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
981 unsigned char *buf, long count)
983 snd_rawmidi_input_trigger(substream, 1);
984 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
986 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
988 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
993 struct snd_rawmidi_file *rfile;
994 struct snd_rawmidi_substream *substream;
995 struct snd_rawmidi_runtime *runtime;
997 rfile = file->private_data;
998 substream = rfile->input;
999 if (substream == NULL)
1001 runtime = substream->runtime;
1002 snd_rawmidi_input_trigger(substream, 1);
1005 spin_lock_irq(&runtime->lock);
1006 while (!snd_rawmidi_ready(substream)) {
1007 wait_queue_entry_t wait;
1009 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1010 spin_unlock_irq(&runtime->lock);
1011 return result > 0 ? result : -EAGAIN;
1013 init_waitqueue_entry(&wait, current);
1014 add_wait_queue(&runtime->sleep, &wait);
1015 set_current_state(TASK_INTERRUPTIBLE);
1016 spin_unlock_irq(&runtime->lock);
1018 remove_wait_queue(&runtime->sleep, &wait);
1019 if (rfile->rmidi->card->shutdown)
1021 if (signal_pending(current))
1022 return result > 0 ? result : -ERESTARTSYS;
1023 if (!runtime->avail)
1024 return result > 0 ? result : -EIO;
1025 spin_lock_irq(&runtime->lock);
1027 spin_unlock_irq(&runtime->lock);
1028 count1 = snd_rawmidi_kernel_read1(substream,
1029 (unsigned char __user *)buf,
1033 return result > 0 ? result : count1;
1042 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1043 * @substream: the rawmidi substream
1045 * Return: 1 if the internal output buffer is empty, 0 if not.
1047 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1049 struct snd_rawmidi_runtime *runtime = substream->runtime;
1051 unsigned long flags;
1053 if (runtime->buffer == NULL) {
1054 rmidi_dbg(substream->rmidi,
1055 "snd_rawmidi_transmit_empty: output is not active!!!\n");
1058 spin_lock_irqsave(&runtime->lock, flags);
1059 result = runtime->avail >= runtime->buffer_size;
1060 spin_unlock_irqrestore(&runtime->lock, flags);
1063 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1066 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1067 * @substream: the rawmidi substream
1068 * @buffer: the buffer pointer
1069 * @count: data size to transfer
1071 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1073 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1074 unsigned char *buffer, int count)
1077 struct snd_rawmidi_runtime *runtime = substream->runtime;
1079 if (runtime->buffer == NULL) {
1080 rmidi_dbg(substream->rmidi,
1081 "snd_rawmidi_transmit_peek: output is not active!!!\n");
1085 if (runtime->avail >= runtime->buffer_size) {
1086 /* warning: lowlevel layer MUST trigger down the hardware */
1089 if (count == 1) { /* special case, faster code */
1090 *buffer = runtime->buffer[runtime->hw_ptr];
1093 count1 = runtime->buffer_size - runtime->hw_ptr;
1096 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1097 count1 = runtime->buffer_size - runtime->avail;
1098 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1102 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1103 count = runtime->buffer_size - runtime->avail - count1;
1104 memcpy(buffer + count1, runtime->buffer, count);
1111 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1114 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1115 * @substream: the rawmidi substream
1116 * @buffer: the buffer pointer
1117 * @count: data size to transfer
1119 * Copies data from the internal output buffer to the given buffer.
1121 * Call this in the interrupt handler when the midi output is ready,
1122 * and call snd_rawmidi_transmit_ack() after the transmission is
1125 * Return: The size of copied data, or a negative error code on failure.
1127 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1128 unsigned char *buffer, int count)
1130 struct snd_rawmidi_runtime *runtime = substream->runtime;
1132 unsigned long flags;
1134 spin_lock_irqsave(&runtime->lock, flags);
1135 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1136 spin_unlock_irqrestore(&runtime->lock, flags);
1139 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1142 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1143 * @substream: the rawmidi substream
1144 * @count: the transferred count
1146 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1148 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1150 struct snd_rawmidi_runtime *runtime = substream->runtime;
1152 if (runtime->buffer == NULL) {
1153 rmidi_dbg(substream->rmidi,
1154 "snd_rawmidi_transmit_ack: output is not active!!!\n");
1157 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1158 runtime->hw_ptr += count;
1159 runtime->hw_ptr %= runtime->buffer_size;
1160 runtime->avail += count;
1161 substream->bytes += count;
1163 if (runtime->drain || snd_rawmidi_ready(substream))
1164 wake_up(&runtime->sleep);
1168 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1171 * snd_rawmidi_transmit_ack - acknowledge the transmission
1172 * @substream: the rawmidi substream
1173 * @count: the transferred count
1175 * Advances the hardware pointer for the internal output buffer with
1176 * the given size and updates the condition.
1177 * Call after the transmission is finished.
1179 * Return: The advanced size if successful, or a negative error code on failure.
1181 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1183 struct snd_rawmidi_runtime *runtime = substream->runtime;
1185 unsigned long flags;
1187 spin_lock_irqsave(&runtime->lock, flags);
1188 result = __snd_rawmidi_transmit_ack(substream, count);
1189 spin_unlock_irqrestore(&runtime->lock, flags);
1192 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1195 * snd_rawmidi_transmit - copy from the buffer to the device
1196 * @substream: the rawmidi substream
1197 * @buffer: the buffer pointer
1198 * @count: the data size to transfer
1200 * Copies data from the buffer to the device and advances the pointer.
1202 * Return: The copied size if successful, or a negative error code on failure.
1204 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1205 unsigned char *buffer, int count)
1207 struct snd_rawmidi_runtime *runtime = substream->runtime;
1209 unsigned long flags;
1211 spin_lock_irqsave(&runtime->lock, flags);
1212 if (!substream->opened)
1215 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1219 result = __snd_rawmidi_transmit_ack(substream, count);
1221 spin_unlock_irqrestore(&runtime->lock, flags);
1224 EXPORT_SYMBOL(snd_rawmidi_transmit);
1227 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1228 * @substream: rawmidi substream
1230 * Return: the number of discarded bytes
1232 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1234 struct snd_rawmidi_runtime *runtime = substream->runtime;
1235 unsigned long flags;
1238 spin_lock_irqsave(&runtime->lock, flags);
1239 if (runtime->avail < runtime->buffer_size) {
1240 count = runtime->buffer_size - runtime->avail;
1241 __snd_rawmidi_transmit_ack(substream, count);
1243 spin_unlock_irqrestore(&runtime->lock, flags);
1246 EXPORT_SYMBOL(snd_rawmidi_proceed);
1248 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1249 const unsigned char __user *userbuf,
1250 const unsigned char *kernelbuf,
1253 unsigned long flags;
1254 long count1, result;
1255 struct snd_rawmidi_runtime *runtime = substream->runtime;
1256 unsigned long appl_ptr;
1258 if (!kernelbuf && !userbuf)
1260 if (snd_BUG_ON(!runtime->buffer))
1264 spin_lock_irqsave(&runtime->lock, flags);
1265 if (substream->append) {
1266 if ((long)runtime->avail < count) {
1267 spin_unlock_irqrestore(&runtime->lock, flags);
1271 while (count > 0 && runtime->avail > 0) {
1272 count1 = runtime->buffer_size - runtime->appl_ptr;
1275 if (count1 > (long)runtime->avail)
1276 count1 = runtime->avail;
1278 /* update runtime->appl_ptr before unlocking for userbuf */
1279 appl_ptr = runtime->appl_ptr;
1280 runtime->appl_ptr += count1;
1281 runtime->appl_ptr %= runtime->buffer_size;
1282 runtime->avail -= count1;
1285 memcpy(runtime->buffer + appl_ptr,
1286 kernelbuf + result, count1);
1288 spin_unlock_irqrestore(&runtime->lock, flags);
1289 if (copy_from_user(runtime->buffer + appl_ptr,
1290 userbuf + result, count1)) {
1291 spin_lock_irqsave(&runtime->lock, flags);
1292 result = result > 0 ? result : -EFAULT;
1295 spin_lock_irqsave(&runtime->lock, flags);
1301 count1 = runtime->avail < runtime->buffer_size;
1302 spin_unlock_irqrestore(&runtime->lock, flags);
1304 snd_rawmidi_output_trigger(substream, 1);
1308 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1309 const unsigned char *buf, long count)
1311 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1313 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1315 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1316 size_t count, loff_t *offset)
1318 long result, timeout;
1320 struct snd_rawmidi_file *rfile;
1321 struct snd_rawmidi_runtime *runtime;
1322 struct snd_rawmidi_substream *substream;
1324 rfile = file->private_data;
1325 substream = rfile->output;
1326 runtime = substream->runtime;
1327 /* we cannot put an atomic message to our buffer */
1328 if (substream->append && count > runtime->buffer_size)
1332 spin_lock_irq(&runtime->lock);
1333 while (!snd_rawmidi_ready_append(substream, count)) {
1334 wait_queue_entry_t wait;
1336 if (file->f_flags & O_NONBLOCK) {
1337 spin_unlock_irq(&runtime->lock);
1338 return result > 0 ? result : -EAGAIN;
1340 init_waitqueue_entry(&wait, current);
1341 add_wait_queue(&runtime->sleep, &wait);
1342 set_current_state(TASK_INTERRUPTIBLE);
1343 spin_unlock_irq(&runtime->lock);
1344 timeout = schedule_timeout(30 * HZ);
1345 remove_wait_queue(&runtime->sleep, &wait);
1346 if (rfile->rmidi->card->shutdown)
1348 if (signal_pending(current))
1349 return result > 0 ? result : -ERESTARTSYS;
1350 if (!runtime->avail && !timeout)
1351 return result > 0 ? result : -EIO;
1352 spin_lock_irq(&runtime->lock);
1354 spin_unlock_irq(&runtime->lock);
1355 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1357 return result > 0 ? result : count1;
1360 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1364 if (file->f_flags & O_DSYNC) {
1365 spin_lock_irq(&runtime->lock);
1366 while (runtime->avail != runtime->buffer_size) {
1367 wait_queue_entry_t wait;
1368 unsigned int last_avail = runtime->avail;
1370 init_waitqueue_entry(&wait, current);
1371 add_wait_queue(&runtime->sleep, &wait);
1372 set_current_state(TASK_INTERRUPTIBLE);
1373 spin_unlock_irq(&runtime->lock);
1374 timeout = schedule_timeout(30 * HZ);
1375 remove_wait_queue(&runtime->sleep, &wait);
1376 if (signal_pending(current))
1377 return result > 0 ? result : -ERESTARTSYS;
1378 if (runtime->avail == last_avail && !timeout)
1379 return result > 0 ? result : -EIO;
1380 spin_lock_irq(&runtime->lock);
1382 spin_unlock_irq(&runtime->lock);
1387 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1389 struct snd_rawmidi_file *rfile;
1390 struct snd_rawmidi_runtime *runtime;
1393 rfile = file->private_data;
1394 if (rfile->input != NULL) {
1395 runtime = rfile->input->runtime;
1396 snd_rawmidi_input_trigger(rfile->input, 1);
1397 poll_wait(file, &runtime->sleep, wait);
1399 if (rfile->output != NULL) {
1400 runtime = rfile->output->runtime;
1401 poll_wait(file, &runtime->sleep, wait);
1404 if (rfile->input != NULL) {
1405 if (snd_rawmidi_ready(rfile->input))
1406 mask |= EPOLLIN | EPOLLRDNORM;
1408 if (rfile->output != NULL) {
1409 if (snd_rawmidi_ready(rfile->output))
1410 mask |= EPOLLOUT | EPOLLWRNORM;
1417 #ifdef CONFIG_COMPAT
1418 #include "rawmidi_compat.c"
1420 #define snd_rawmidi_ioctl_compat NULL
1426 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1427 struct snd_info_buffer *buffer)
1429 struct snd_rawmidi *rmidi;
1430 struct snd_rawmidi_substream *substream;
1431 struct snd_rawmidi_runtime *runtime;
1433 rmidi = entry->private_data;
1434 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1435 mutex_lock(&rmidi->open_mutex);
1436 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1437 list_for_each_entry(substream,
1438 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1442 " Tx bytes : %lu\n",
1444 (unsigned long) substream->bytes);
1445 if (substream->opened) {
1447 " Owner PID : %d\n",
1448 pid_vnr(substream->pid));
1449 runtime = substream->runtime;
1452 " Buffer size : %lu\n"
1454 runtime->oss ? "OSS compatible" : "native",
1455 (unsigned long) runtime->buffer_size,
1456 (unsigned long) runtime->avail);
1460 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1461 list_for_each_entry(substream,
1462 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1466 " Rx bytes : %lu\n",
1468 (unsigned long) substream->bytes);
1469 if (substream->opened) {
1471 " Owner PID : %d\n",
1472 pid_vnr(substream->pid));
1473 runtime = substream->runtime;
1475 " Buffer size : %lu\n"
1477 " Overruns : %lu\n",
1478 (unsigned long) runtime->buffer_size,
1479 (unsigned long) runtime->avail,
1480 (unsigned long) runtime->xruns);
1484 mutex_unlock(&rmidi->open_mutex);
1488 * Register functions
1491 static const struct file_operations snd_rawmidi_f_ops = {
1492 .owner = THIS_MODULE,
1493 .read = snd_rawmidi_read,
1494 .write = snd_rawmidi_write,
1495 .open = snd_rawmidi_open,
1496 .release = snd_rawmidi_release,
1497 .llseek = no_llseek,
1498 .poll = snd_rawmidi_poll,
1499 .unlocked_ioctl = snd_rawmidi_ioctl,
1500 .compat_ioctl = snd_rawmidi_ioctl_compat,
1503 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1504 struct snd_rawmidi_str *stream,
1508 struct snd_rawmidi_substream *substream;
1511 for (idx = 0; idx < count; idx++) {
1512 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1515 substream->stream = direction;
1516 substream->number = idx;
1517 substream->rmidi = rmidi;
1518 substream->pstr = stream;
1519 list_add_tail(&substream->list, &stream->substreams);
1520 stream->substream_count++;
1525 static void release_rawmidi_device(struct device *dev)
1527 kfree(container_of(dev, struct snd_rawmidi, dev));
1531 * snd_rawmidi_new - create a rawmidi instance
1532 * @card: the card instance
1533 * @id: the id string
1534 * @device: the device index
1535 * @output_count: the number of output streams
1536 * @input_count: the number of input streams
1537 * @rrawmidi: the pointer to store the new rawmidi instance
1539 * Creates a new rawmidi instance.
1540 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1542 * Return: Zero if successful, or a negative error code on failure.
1544 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1545 int output_count, int input_count,
1546 struct snd_rawmidi **rrawmidi)
1548 struct snd_rawmidi *rmidi;
1550 static struct snd_device_ops ops = {
1551 .dev_free = snd_rawmidi_dev_free,
1552 .dev_register = snd_rawmidi_dev_register,
1553 .dev_disconnect = snd_rawmidi_dev_disconnect,
1556 if (snd_BUG_ON(!card))
1560 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1564 rmidi->device = device;
1565 mutex_init(&rmidi->open_mutex);
1566 init_waitqueue_head(&rmidi->open_wait);
1567 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1568 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1571 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1573 snd_device_initialize(&rmidi->dev, card);
1574 rmidi->dev.release = release_rawmidi_device;
1575 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1577 err = snd_rawmidi_alloc_substreams(rmidi,
1578 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1579 SNDRV_RAWMIDI_STREAM_INPUT,
1583 err = snd_rawmidi_alloc_substreams(rmidi,
1584 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1585 SNDRV_RAWMIDI_STREAM_OUTPUT,
1589 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1598 snd_rawmidi_free(rmidi);
1601 EXPORT_SYMBOL(snd_rawmidi_new);
1603 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1605 struct snd_rawmidi_substream *substream;
1607 while (!list_empty(&stream->substreams)) {
1608 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1609 list_del(&substream->list);
1614 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1619 snd_info_free_entry(rmidi->proc_entry);
1620 rmidi->proc_entry = NULL;
1621 mutex_lock(®ister_mutex);
1622 if (rmidi->ops && rmidi->ops->dev_unregister)
1623 rmidi->ops->dev_unregister(rmidi);
1624 mutex_unlock(®ister_mutex);
1626 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1627 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1628 if (rmidi->private_free)
1629 rmidi->private_free(rmidi);
1630 put_device(&rmidi->dev);
1634 static int snd_rawmidi_dev_free(struct snd_device *device)
1636 struct snd_rawmidi *rmidi = device->device_data;
1638 return snd_rawmidi_free(rmidi);
1641 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1642 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1644 struct snd_rawmidi *rmidi = device->private_data;
1646 rmidi->seq_dev = NULL;
1650 static int snd_rawmidi_dev_register(struct snd_device *device)
1653 struct snd_info_entry *entry;
1655 struct snd_rawmidi *rmidi = device->device_data;
1657 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1660 mutex_lock(®ister_mutex);
1661 if (snd_rawmidi_search(rmidi->card, rmidi->device))
1664 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1665 mutex_unlock(®ister_mutex);
1669 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1670 rmidi->card, rmidi->device,
1671 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1673 rmidi_err(rmidi, "unable to register\n");
1676 if (rmidi->ops && rmidi->ops->dev_register) {
1677 err = rmidi->ops->dev_register(rmidi);
1679 goto error_unregister;
1681 #ifdef CONFIG_SND_OSSEMUL
1683 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1684 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1685 rmidi->card, 0, &snd_rawmidi_f_ops,
1688 "unable to register OSS rawmidi device %i:%i\n",
1689 rmidi->card->number, 0);
1692 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1693 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1697 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1698 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1699 rmidi->card, 1, &snd_rawmidi_f_ops,
1702 "unable to register OSS rawmidi device %i:%i\n",
1703 rmidi->card->number, 1);
1708 #endif /* CONFIG_SND_OSSEMUL */
1709 sprintf(name, "midi%d", rmidi->device);
1710 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1712 entry->private_data = rmidi;
1713 entry->c.text.read = snd_rawmidi_proc_info_read;
1714 if (snd_info_register(entry) < 0) {
1715 snd_info_free_entry(entry);
1719 rmidi->proc_entry = entry;
1720 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1721 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1722 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1723 rmidi->seq_dev->private_data = rmidi;
1724 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1725 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1726 snd_device_register(rmidi->card, rmidi->seq_dev);
1733 snd_unregister_device(&rmidi->dev);
1735 mutex_lock(®ister_mutex);
1736 list_del(&rmidi->list);
1737 mutex_unlock(®ister_mutex);
1741 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1743 struct snd_rawmidi *rmidi = device->device_data;
1746 mutex_lock(®ister_mutex);
1747 mutex_lock(&rmidi->open_mutex);
1748 wake_up(&rmidi->open_wait);
1749 list_del_init(&rmidi->list);
1750 for (dir = 0; dir < 2; dir++) {
1751 struct snd_rawmidi_substream *s;
1753 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1755 wake_up(&s->runtime->sleep);
1759 #ifdef CONFIG_SND_OSSEMUL
1760 if (rmidi->ossreg) {
1761 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1762 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1763 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1764 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1767 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1768 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1771 #endif /* CONFIG_SND_OSSEMUL */
1772 snd_unregister_device(&rmidi->dev);
1773 mutex_unlock(&rmidi->open_mutex);
1774 mutex_unlock(®ister_mutex);
1779 * snd_rawmidi_set_ops - set the rawmidi operators
1780 * @rmidi: the rawmidi instance
1781 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1782 * @ops: the operator table
1784 * Sets the rawmidi operators for the given stream direction.
1786 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1787 const struct snd_rawmidi_ops *ops)
1789 struct snd_rawmidi_substream *substream;
1791 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1792 substream->ops = ops;
1794 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1800 static int __init alsa_rawmidi_init(void)
1803 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1804 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1805 #ifdef CONFIG_SND_OSSEMUL
1807 /* check device map table */
1808 for (i = 0; i < SNDRV_CARDS; i++) {
1809 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1810 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1814 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1815 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1821 #endif /* CONFIG_SND_OSSEMUL */
1825 static void __exit alsa_rawmidi_exit(void)
1827 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1828 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1831 module_init(alsa_rawmidi_init)
1832 module_exit(alsa_rawmidi_exit)