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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Abstract layer for MIDI v1.0 stream4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>5 */6 7#include <sound/core.h>8#include <linux/major.h>9#include <linux/init.h>10#include <linux/sched/signal.h>11#include <linux/slab.h>12#include <linux/time.h>13#include <linux/wait.h>14#include <linux/mutex.h>15#include <linux/module.h>16#include <linux/delay.h>17#include <linux/mm.h>18#include <linux/nospec.h>19#include <sound/rawmidi.h>20#include <sound/info.h>21#include <sound/control.h>22#include <sound/minors.h>23#include <sound/initval.h>24#include <sound/ump.h>25 26MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");27MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");28MODULE_LICENSE("GPL");29 30#ifdef CONFIG_SND_OSSEMUL31static int midi_map[SNDRV_CARDS];32static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};33module_param_array(midi_map, int, NULL, 0444);34MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");35module_param_array(amidi_map, int, NULL, 0444);36MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");37#endif /* CONFIG_SND_OSSEMUL */38 39static int snd_rawmidi_dev_free(struct snd_device *device);40static int snd_rawmidi_dev_register(struct snd_device *device);41static int snd_rawmidi_dev_disconnect(struct snd_device *device);42 43static LIST_HEAD(snd_rawmidi_devices);44static DEFINE_MUTEX(register_mutex);45 46#define rmidi_err(rmidi, fmt, args...) \47 dev_err((rmidi)->dev, fmt, ##args)48#define rmidi_warn(rmidi, fmt, args...) \49 dev_warn((rmidi)->dev, fmt, ##args)50#define rmidi_dbg(rmidi, fmt, args...) \51 dev_dbg((rmidi)->dev, fmt, ##args)52 53struct snd_rawmidi_status32 {54 s32 stream;55 s32 tstamp_sec; /* Timestamp */56 s32 tstamp_nsec;57 u32 avail; /* available bytes */58 u32 xruns; /* count of overruns since last status (in bytes) */59 unsigned char reserved[16]; /* reserved for future use */60};61 62#define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32)63 64struct snd_rawmidi_status64 {65 int stream;66 u8 rsvd[4]; /* alignment */67 s64 tstamp_sec; /* Timestamp */68 s64 tstamp_nsec;69 size_t avail; /* available bytes */70 size_t xruns; /* count of overruns since last status (in bytes) */71 unsigned char reserved[16]; /* reserved for future use */72};73 74#define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64)75 76#define rawmidi_is_ump(rmidi) \77 (IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP))78 79static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)80{81 struct snd_rawmidi *rawmidi;82 83 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)84 if (rawmidi->card == card && rawmidi->device == device)85 return rawmidi;86 return NULL;87}88 89static inline unsigned short snd_rawmidi_file_flags(struct file *file)90{91 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {92 case FMODE_WRITE:93 return SNDRV_RAWMIDI_LFLG_OUTPUT;94 case FMODE_READ:95 return SNDRV_RAWMIDI_LFLG_INPUT;96 default:97 return SNDRV_RAWMIDI_LFLG_OPEN;98 }99}100 101static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)102{103 return runtime->avail >= runtime->avail_min;104}105 106static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)107{108 guard(spinlock_irqsave)(&substream->lock);109 return __snd_rawmidi_ready(substream->runtime);110}111 112static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,113 size_t count)114{115 struct snd_rawmidi_runtime *runtime = substream->runtime;116 117 return runtime->avail >= runtime->avail_min &&118 (!substream->append || runtime->avail >= count);119}120 121static void snd_rawmidi_input_event_work(struct work_struct *work)122{123 struct snd_rawmidi_runtime *runtime =124 container_of(work, struct snd_rawmidi_runtime, event_work);125 126 if (runtime->event)127 runtime->event(runtime->substream);128}129 130/* buffer refcount management: call with substream->lock held */131static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)132{133 runtime->buffer_ref++;134}135 136static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)137{138 runtime->buffer_ref--;139}140 141static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)142{143 int loop = HZ;144 145 spin_lock_irq(&substream->lock);146 while (substream->runtime->buffer_ref) {147 spin_unlock_irq(&substream->lock);148 if (!--loop) {149 rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");150 return;151 }152 schedule_timeout_uninterruptible(1);153 spin_lock_irq(&substream->lock);154 }155 spin_unlock_irq(&substream->lock);156}157 158static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)159{160 struct snd_rawmidi_runtime *runtime;161 162 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);163 if (!runtime)164 return -ENOMEM;165 runtime->substream = substream;166 init_waitqueue_head(&runtime->sleep);167 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);168 runtime->event = NULL;169 runtime->buffer_size = PAGE_SIZE;170 runtime->avail_min = 1;171 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)172 runtime->avail = 0;173 else174 runtime->avail = runtime->buffer_size;175 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);176 if (!runtime->buffer) {177 kfree(runtime);178 return -ENOMEM;179 }180 runtime->appl_ptr = runtime->hw_ptr = 0;181 substream->runtime = runtime;182 if (rawmidi_is_ump(substream->rmidi))183 runtime->align = 3;184 return 0;185}186 187/* get the current alignment (either 0 or 3) */188static inline int get_align(struct snd_rawmidi_runtime *runtime)189{190 if (IS_ENABLED(CONFIG_SND_UMP))191 return runtime->align;192 else193 return 0;194}195 196/* get the trimmed size with the current alignment */197#define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))198 199static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)200{201 struct snd_rawmidi_runtime *runtime = substream->runtime;202 203 kvfree(runtime->buffer);204 kfree(runtime);205 substream->runtime = NULL;206 return 0;207}208 209static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)210{211 if (!substream->opened)212 return;213 substream->ops->trigger(substream, up);214}215 216static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)217{218 if (!substream->opened)219 return;220 substream->ops->trigger(substream, up);221 if (!up)222 cancel_work_sync(&substream->runtime->event_work);223}224 225static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,226 bool is_input)227{228 runtime->drain = 0;229 runtime->appl_ptr = runtime->hw_ptr = 0;230 runtime->avail = is_input ? 0 : runtime->buffer_size;231}232 233static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,234 bool is_input)235{236 guard(spinlock_irqsave)(&substream->lock);237 if (substream->opened && substream->runtime)238 __reset_runtime_ptrs(substream->runtime, is_input);239}240 241int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)242{243 snd_rawmidi_output_trigger(substream, 0);244 reset_runtime_ptrs(substream, false);245 return 0;246}247EXPORT_SYMBOL(snd_rawmidi_drop_output);248 249int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)250{251 int err = 0;252 long timeout;253 struct snd_rawmidi_runtime *runtime;254 255 scoped_guard(spinlock_irq, &substream->lock) {256 runtime = substream->runtime;257 if (!substream->opened || !runtime || !runtime->buffer)258 return -EINVAL;259 snd_rawmidi_buffer_ref(runtime);260 runtime->drain = 1;261 }262 263 timeout = wait_event_interruptible_timeout(runtime->sleep,264 (runtime->avail >= runtime->buffer_size),265 10*HZ);266 267 scoped_guard(spinlock_irq, &substream->lock) {268 if (signal_pending(current))269 err = -ERESTARTSYS;270 if (runtime->avail < runtime->buffer_size && !timeout) {271 rmidi_warn(substream->rmidi,272 "rawmidi drain error (avail = %li, buffer_size = %li)\n",273 (long)runtime->avail, (long)runtime->buffer_size);274 err = -EIO;275 }276 runtime->drain = 0;277 }278 279 if (err != -ERESTARTSYS) {280 /* we need wait a while to make sure that Tx FIFOs are empty */281 if (substream->ops->drain)282 substream->ops->drain(substream);283 else284 msleep(50);285 snd_rawmidi_drop_output(substream);286 }287 288 scoped_guard(spinlock_irq, &substream->lock)289 snd_rawmidi_buffer_unref(runtime);290 291 return err;292}293EXPORT_SYMBOL(snd_rawmidi_drain_output);294 295int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)296{297 snd_rawmidi_input_trigger(substream, 0);298 reset_runtime_ptrs(substream, true);299 return 0;300}301EXPORT_SYMBOL(snd_rawmidi_drain_input);302 303/* look for an available substream for the given stream direction;304 * if a specific subdevice is given, try to assign it305 */306static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,307 int stream, int mode,308 struct snd_rawmidi_substream **sub_ret)309{310 struct snd_rawmidi_substream *substream;311 struct snd_rawmidi_str *s = &rmidi->streams[stream];312 static const unsigned int info_flags[2] = {313 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,314 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,315 };316 317 if (!(rmidi->info_flags & info_flags[stream]))318 return -ENXIO;319 if (subdevice >= 0 && subdevice >= s->substream_count)320 return -ENODEV;321 322 list_for_each_entry(substream, &s->substreams, list) {323 if (substream->opened) {324 if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||325 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||326 !substream->append)327 continue;328 }329 if (subdevice < 0 || subdevice == substream->number) {330 *sub_ret = substream;331 return 0;332 }333 }334 return -EAGAIN;335}336 337/* open and do ref-counting for the given substream */338static int open_substream(struct snd_rawmidi *rmidi,339 struct snd_rawmidi_substream *substream,340 int mode)341{342 int err;343 344 if (substream->use_count == 0) {345 err = snd_rawmidi_runtime_create(substream);346 if (err < 0)347 return err;348 err = substream->ops->open(substream);349 if (err < 0) {350 snd_rawmidi_runtime_free(substream);351 return err;352 }353 guard(spinlock_irq)(&substream->lock);354 substream->opened = 1;355 substream->active_sensing = 0;356 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)357 substream->append = 1;358 substream->pid = get_pid(task_pid(current));359 rmidi->streams[substream->stream].substream_opened++;360 }361 substream->use_count++;362 return 0;363}364 365static void close_substream(struct snd_rawmidi *rmidi,366 struct snd_rawmidi_substream *substream,367 int cleanup);368 369static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,370 struct snd_rawmidi_file *rfile)371{372 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;373 int err;374 375 rfile->input = rfile->output = NULL;376 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {377 err = assign_substream(rmidi, subdevice,378 SNDRV_RAWMIDI_STREAM_INPUT,379 mode, &sinput);380 if (err < 0)381 return err;382 }383 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {384 err = assign_substream(rmidi, subdevice,385 SNDRV_RAWMIDI_STREAM_OUTPUT,386 mode, &soutput);387 if (err < 0)388 return err;389 }390 391 if (sinput) {392 err = open_substream(rmidi, sinput, mode);393 if (err < 0)394 return err;395 }396 if (soutput) {397 err = open_substream(rmidi, soutput, mode);398 if (err < 0) {399 if (sinput)400 close_substream(rmidi, sinput, 0);401 return err;402 }403 }404 405 rfile->rmidi = rmidi;406 rfile->input = sinput;407 rfile->output = soutput;408 return 0;409}410 411/* called from sound/core/seq/seq_midi.c */412int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,413 int mode, struct snd_rawmidi_file *rfile)414{415 int err;416 417 if (snd_BUG_ON(!rfile))418 return -EINVAL;419 if (!try_module_get(rmidi->card->module))420 return -ENXIO;421 422 guard(mutex)(&rmidi->open_mutex);423 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);424 if (err < 0)425 module_put(rmidi->card->module);426 return err;427}428EXPORT_SYMBOL(snd_rawmidi_kernel_open);429 430static int snd_rawmidi_open(struct inode *inode, struct file *file)431{432 int maj = imajor(inode);433 struct snd_card *card;434 int subdevice;435 unsigned short fflags;436 int err;437 struct snd_rawmidi *rmidi;438 struct snd_rawmidi_file *rawmidi_file = NULL;439 wait_queue_entry_t wait;440 441 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))442 return -EINVAL; /* invalid combination */443 444 err = stream_open(inode, file);445 if (err < 0)446 return err;447 448 if (maj == snd_major) {449 rmidi = snd_lookup_minor_data(iminor(inode),450 SNDRV_DEVICE_TYPE_RAWMIDI);451#ifdef CONFIG_SND_OSSEMUL452 } else if (maj == SOUND_MAJOR) {453 rmidi = snd_lookup_oss_minor_data(iminor(inode),454 SNDRV_OSS_DEVICE_TYPE_MIDI);455#endif456 } else457 return -ENXIO;458 459 if (rmidi == NULL)460 return -ENODEV;461 462 if (!try_module_get(rmidi->card->module)) {463 snd_card_unref(rmidi->card);464 return -ENXIO;465 }466 467 mutex_lock(&rmidi->open_mutex);468 card = rmidi->card;469 err = snd_card_file_add(card, file);470 if (err < 0)471 goto __error_card;472 fflags = snd_rawmidi_file_flags(file);473 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */474 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;475 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);476 if (rawmidi_file == NULL) {477 err = -ENOMEM;478 goto __error;479 }480 rawmidi_file->user_pversion = 0;481 init_waitqueue_entry(&wait, current);482 add_wait_queue(&rmidi->open_wait, &wait);483 while (1) {484 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);485 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);486 if (err >= 0)487 break;488 if (err == -EAGAIN) {489 if (file->f_flags & O_NONBLOCK) {490 err = -EBUSY;491 break;492 }493 } else494 break;495 set_current_state(TASK_INTERRUPTIBLE);496 mutex_unlock(&rmidi->open_mutex);497 schedule();498 mutex_lock(&rmidi->open_mutex);499 if (rmidi->card->shutdown) {500 err = -ENODEV;501 break;502 }503 if (signal_pending(current)) {504 err = -ERESTARTSYS;505 break;506 }507 }508 remove_wait_queue(&rmidi->open_wait, &wait);509 if (err < 0) {510 kfree(rawmidi_file);511 goto __error;512 }513#ifdef CONFIG_SND_OSSEMUL514 if (rawmidi_file->input && rawmidi_file->input->runtime)515 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);516 if (rawmidi_file->output && rawmidi_file->output->runtime)517 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);518#endif519 file->private_data = rawmidi_file;520 mutex_unlock(&rmidi->open_mutex);521 snd_card_unref(rmidi->card);522 return 0;523 524 __error:525 snd_card_file_remove(card, file);526 __error_card:527 mutex_unlock(&rmidi->open_mutex);528 module_put(rmidi->card->module);529 snd_card_unref(rmidi->card);530 return err;531}532 533static void close_substream(struct snd_rawmidi *rmidi,534 struct snd_rawmidi_substream *substream,535 int cleanup)536{537 if (--substream->use_count)538 return;539 540 if (cleanup) {541 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)542 snd_rawmidi_input_trigger(substream, 0);543 else {544 if (substream->active_sensing) {545 unsigned char buf = 0xfe;546 /* sending single active sensing message547 * to shut the device up548 */549 snd_rawmidi_kernel_write(substream, &buf, 1);550 }551 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)552 snd_rawmidi_output_trigger(substream, 0);553 }554 snd_rawmidi_buffer_ref_sync(substream);555 }556 scoped_guard(spinlock_irq, &substream->lock) {557 substream->opened = 0;558 substream->append = 0;559 }560 substream->ops->close(substream);561 if (substream->runtime->private_free)562 substream->runtime->private_free(substream);563 snd_rawmidi_runtime_free(substream);564 put_pid(substream->pid);565 substream->pid = NULL;566 rmidi->streams[substream->stream].substream_opened--;567}568 569static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)570{571 struct snd_rawmidi *rmidi;572 573 rmidi = rfile->rmidi;574 guard(mutex)(&rmidi->open_mutex);575 if (rfile->input) {576 close_substream(rmidi, rfile->input, 1);577 rfile->input = NULL;578 }579 if (rfile->output) {580 close_substream(rmidi, rfile->output, 1);581 rfile->output = NULL;582 }583 rfile->rmidi = NULL;584 wake_up(&rmidi->open_wait);585}586 587/* called from sound/core/seq/seq_midi.c */588int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)589{590 struct snd_rawmidi *rmidi;591 592 if (snd_BUG_ON(!rfile))593 return -ENXIO;594 595 rmidi = rfile->rmidi;596 rawmidi_release_priv(rfile);597 module_put(rmidi->card->module);598 return 0;599}600EXPORT_SYMBOL(snd_rawmidi_kernel_release);601 602static int snd_rawmidi_release(struct inode *inode, struct file *file)603{604 struct snd_rawmidi_file *rfile;605 struct snd_rawmidi *rmidi;606 struct module *module;607 608 rfile = file->private_data;609 rmidi = rfile->rmidi;610 rawmidi_release_priv(rfile);611 kfree(rfile);612 module = rmidi->card->module;613 snd_card_file_remove(rmidi->card, file);614 module_put(module);615 return 0;616}617 618static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,619 struct snd_rawmidi_info *info)620{621 struct snd_rawmidi *rmidi;622 623 if (substream == NULL)624 return -ENODEV;625 rmidi = substream->rmidi;626 memset(info, 0, sizeof(*info));627 info->card = rmidi->card->number;628 info->device = rmidi->device;629 info->subdevice = substream->number;630 info->stream = substream->stream;631 info->flags = rmidi->info_flags;632 strcpy(info->id, rmidi->id);633 strcpy(info->name, rmidi->name);634 strcpy(info->subname, substream->name);635 info->subdevices_count = substream->pstr->substream_count;636 info->subdevices_avail = (substream->pstr->substream_count -637 substream->pstr->substream_opened);638 return 0;639}640 641static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,642 struct snd_rawmidi_info __user *_info)643{644 struct snd_rawmidi_info info;645 int err;646 647 err = snd_rawmidi_info(substream, &info);648 if (err < 0)649 return err;650 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))651 return -EFAULT;652 return 0;653}654 655static int __snd_rawmidi_info_select(struct snd_card *card,656 struct snd_rawmidi_info *info)657{658 struct snd_rawmidi *rmidi;659 struct snd_rawmidi_str *pstr;660 struct snd_rawmidi_substream *substream;661 662 rmidi = snd_rawmidi_search(card, info->device);663 if (!rmidi)664 return -ENXIO;665 if (info->stream < 0 || info->stream > 1)666 return -EINVAL;667 info->stream = array_index_nospec(info->stream, 2);668 pstr = &rmidi->streams[info->stream];669 if (pstr->substream_count == 0)670 return -ENOENT;671 if (info->subdevice >= pstr->substream_count)672 return -ENXIO;673 list_for_each_entry(substream, &pstr->substreams, list) {674 if ((unsigned int)substream->number == info->subdevice)675 return snd_rawmidi_info(substream, info);676 }677 return -ENXIO;678}679 680int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)681{682 guard(mutex)(®ister_mutex);683 return __snd_rawmidi_info_select(card, info);684}685EXPORT_SYMBOL(snd_rawmidi_info_select);686 687static int snd_rawmidi_info_select_user(struct snd_card *card,688 struct snd_rawmidi_info __user *_info)689{690 int err;691 struct snd_rawmidi_info info;692 693 if (get_user(info.device, &_info->device))694 return -EFAULT;695 if (get_user(info.stream, &_info->stream))696 return -EFAULT;697 if (get_user(info.subdevice, &_info->subdevice))698 return -EFAULT;699 err = snd_rawmidi_info_select(card, &info);700 if (err < 0)701 return err;702 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))703 return -EFAULT;704 return 0;705}706 707static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,708 struct snd_rawmidi_params *params,709 bool is_input)710{711 struct snd_rawmidi_runtime *runtime = substream->runtime;712 char *newbuf, *oldbuf;713 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;714 715 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)716 return -EINVAL;717 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)718 return -EINVAL;719 if (params->avail_min < 1 || params->avail_min > params->buffer_size)720 return -EINVAL;721 if (params->buffer_size & get_align(runtime))722 return -EINVAL;723 if (params->buffer_size != runtime->buffer_size) {724 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);725 if (!newbuf)726 return -ENOMEM;727 guard(spinlock_irq)(&substream->lock);728 if (runtime->buffer_ref) {729 kvfree(newbuf);730 return -EBUSY;731 }732 oldbuf = runtime->buffer;733 runtime->buffer = newbuf;734 runtime->buffer_size = params->buffer_size;735 __reset_runtime_ptrs(runtime, is_input);736 kvfree(oldbuf);737 }738 runtime->avail_min = params->avail_min;739 return 0;740}741 742int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,743 struct snd_rawmidi_params *params)744{745 int err;746 747 snd_rawmidi_drain_output(substream);748 guard(mutex)(&substream->rmidi->open_mutex);749 if (substream->append && substream->use_count > 1)750 return -EBUSY;751 err = resize_runtime_buffer(substream, params, false);752 if (!err)753 substream->active_sensing = !params->no_active_sensing;754 return err;755}756EXPORT_SYMBOL(snd_rawmidi_output_params);757 758int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,759 struct snd_rawmidi_params *params)760{761 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;762 unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;763 int err;764 765 snd_rawmidi_drain_input(substream);766 guard(mutex)(&substream->rmidi->open_mutex);767 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)768 err = -EINVAL;769 else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)770 err = -EINVAL;771 else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)772 err = -EINVAL;773 else774 err = resize_runtime_buffer(substream, params, true);775 776 if (!err) {777 substream->framing = framing;778 substream->clock_type = clock_type;779 }780 return 0;781}782EXPORT_SYMBOL(snd_rawmidi_input_params);783 784static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,785 struct snd_rawmidi_status64 *status)786{787 struct snd_rawmidi_runtime *runtime = substream->runtime;788 789 memset(status, 0, sizeof(*status));790 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;791 guard(spinlock_irq)(&substream->lock);792 status->avail = runtime->avail;793 return 0;794}795 796static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,797 struct snd_rawmidi_status64 *status)798{799 struct snd_rawmidi_runtime *runtime = substream->runtime;800 801 memset(status, 0, sizeof(*status));802 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;803 guard(spinlock_irq)(&substream->lock);804 status->avail = runtime->avail;805 status->xruns = runtime->xruns;806 runtime->xruns = 0;807 return 0;808}809 810static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,811 struct snd_rawmidi_status32 __user *argp)812{813 int err = 0;814 struct snd_rawmidi_status32 __user *status = argp;815 struct snd_rawmidi_status32 status32;816 struct snd_rawmidi_status64 status64;817 818 if (copy_from_user(&status32, argp,819 sizeof(struct snd_rawmidi_status32)))820 return -EFAULT;821 822 switch (status32.stream) {823 case SNDRV_RAWMIDI_STREAM_OUTPUT:824 if (rfile->output == NULL)825 return -EINVAL;826 err = snd_rawmidi_output_status(rfile->output, &status64);827 break;828 case SNDRV_RAWMIDI_STREAM_INPUT:829 if (rfile->input == NULL)830 return -EINVAL;831 err = snd_rawmidi_input_status(rfile->input, &status64);832 break;833 default:834 return -EINVAL;835 }836 if (err < 0)837 return err;838 839 status32 = (struct snd_rawmidi_status32) {840 .stream = status64.stream,841 .tstamp_sec = status64.tstamp_sec,842 .tstamp_nsec = status64.tstamp_nsec,843 .avail = status64.avail,844 .xruns = status64.xruns,845 };846 847 if (copy_to_user(status, &status32, sizeof(*status)))848 return -EFAULT;849 850 return 0;851}852 853static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,854 struct snd_rawmidi_status64 __user *argp)855{856 int err = 0;857 struct snd_rawmidi_status64 status;858 859 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))860 return -EFAULT;861 862 switch (status.stream) {863 case SNDRV_RAWMIDI_STREAM_OUTPUT:864 if (rfile->output == NULL)865 return -EINVAL;866 err = snd_rawmidi_output_status(rfile->output, &status);867 break;868 case SNDRV_RAWMIDI_STREAM_INPUT:869 if (rfile->input == NULL)870 return -EINVAL;871 err = snd_rawmidi_input_status(rfile->input, &status);872 break;873 default:874 return -EINVAL;875 }876 if (err < 0)877 return err;878 if (copy_to_user(argp, &status,879 sizeof(struct snd_rawmidi_status64)))880 return -EFAULT;881 return 0;882}883 884static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)885{886 struct snd_rawmidi_file *rfile;887 struct snd_rawmidi *rmidi;888 void __user *argp = (void __user *)arg;889 890 rfile = file->private_data;891 if (((cmd >> 8) & 0xff) != 'W')892 return -ENOTTY;893 switch (cmd) {894 case SNDRV_RAWMIDI_IOCTL_PVERSION:895 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;896 case SNDRV_RAWMIDI_IOCTL_INFO:897 {898 int stream;899 struct snd_rawmidi_info __user *info = argp;900 901 if (get_user(stream, &info->stream))902 return -EFAULT;903 switch (stream) {904 case SNDRV_RAWMIDI_STREAM_INPUT:905 return snd_rawmidi_info_user(rfile->input, info);906 case SNDRV_RAWMIDI_STREAM_OUTPUT:907 return snd_rawmidi_info_user(rfile->output, info);908 default:909 return -EINVAL;910 }911 }912 case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:913 if (get_user(rfile->user_pversion, (unsigned int __user *)arg))914 return -EFAULT;915 return 0;916 917 case SNDRV_RAWMIDI_IOCTL_PARAMS:918 {919 struct snd_rawmidi_params params;920 921 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))922 return -EFAULT;923 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {924 params.mode = 0;925 memset(params.reserved, 0, sizeof(params.reserved));926 }927 switch (params.stream) {928 case SNDRV_RAWMIDI_STREAM_OUTPUT:929 if (rfile->output == NULL)930 return -EINVAL;931 return snd_rawmidi_output_params(rfile->output, ¶ms);932 case SNDRV_RAWMIDI_STREAM_INPUT:933 if (rfile->input == NULL)934 return -EINVAL;935 return snd_rawmidi_input_params(rfile->input, ¶ms);936 default:937 return -EINVAL;938 }939 }940 case SNDRV_RAWMIDI_IOCTL_STATUS32:941 return snd_rawmidi_ioctl_status32(rfile, argp);942 case SNDRV_RAWMIDI_IOCTL_STATUS64:943 return snd_rawmidi_ioctl_status64(rfile, argp);944 case SNDRV_RAWMIDI_IOCTL_DROP:945 {946 int val;947 948 if (get_user(val, (int __user *) argp))949 return -EFAULT;950 switch (val) {951 case SNDRV_RAWMIDI_STREAM_OUTPUT:952 if (rfile->output == NULL)953 return -EINVAL;954 return snd_rawmidi_drop_output(rfile->output);955 default:956 return -EINVAL;957 }958 }959 case SNDRV_RAWMIDI_IOCTL_DRAIN:960 {961 int val;962 963 if (get_user(val, (int __user *) argp))964 return -EFAULT;965 switch (val) {966 case SNDRV_RAWMIDI_STREAM_OUTPUT:967 if (rfile->output == NULL)968 return -EINVAL;969 return snd_rawmidi_drain_output(rfile->output);970 case SNDRV_RAWMIDI_STREAM_INPUT:971 if (rfile->input == NULL)972 return -EINVAL;973 return snd_rawmidi_drain_input(rfile->input);974 default:975 return -EINVAL;976 }977 }978 default:979 rmidi = rfile->rmidi;980 if (rmidi->ops && rmidi->ops->ioctl)981 return rmidi->ops->ioctl(rmidi, cmd, argp);982 rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);983 }984 return -ENOTTY;985}986 987/* ioctl to find the next device; either legacy or UMP depending on @find_ump */988static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,989 bool find_ump)990 991{992 struct snd_rawmidi *rmidi;993 int device;994 bool is_ump;995 996 if (get_user(device, argp))997 return -EFAULT;998 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */999 device = SNDRV_RAWMIDI_DEVICES - 1;1000 scoped_guard(mutex, ®ister_mutex) {1001 device = device < 0 ? 0 : device + 1;1002 for (; device < SNDRV_RAWMIDI_DEVICES; device++) {1003 rmidi = snd_rawmidi_search(card, device);1004 if (!rmidi)1005 continue;1006 is_ump = rawmidi_is_ump(rmidi);1007 if (find_ump == is_ump)1008 break;1009 }1010 if (device == SNDRV_RAWMIDI_DEVICES)1011 device = -1;1012 }1013 if (put_user(device, argp))1014 return -EFAULT;1015 return 0;1016}1017 1018#if IS_ENABLED(CONFIG_SND_UMP)1019/* inquiry of UMP endpoint and block info via control API */1020static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,1021 void __user *argp)1022{1023 struct snd_ump_endpoint_info __user *info = argp;1024 struct snd_rawmidi *rmidi;1025 int device;1026 1027 if (get_user(device, &info->device))1028 return -EFAULT;1029 guard(mutex)(®ister_mutex);1030 rmidi = snd_rawmidi_search(card, device);1031 if (rmidi && rmidi->ops && rmidi->ops->ioctl)1032 return rmidi->ops->ioctl(rmidi, cmd, argp);1033 else1034 return -ENXIO;1035}1036#endif1037 1038static int snd_rawmidi_control_ioctl(struct snd_card *card,1039 struct snd_ctl_file *control,1040 unsigned int cmd,1041 unsigned long arg)1042{1043 void __user *argp = (void __user *)arg;1044 1045 switch (cmd) {1046 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:1047 return snd_rawmidi_next_device(card, argp, false);1048#if IS_ENABLED(CONFIG_SND_UMP)1049 case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:1050 return snd_rawmidi_next_device(card, argp, true);1051 case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:1052 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);1053 case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:1054 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);1055#endif1056 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:1057 {1058 int val;1059 1060 if (get_user(val, (int __user *)argp))1061 return -EFAULT;1062 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;1063 return 0;1064 }1065 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:1066 return snd_rawmidi_info_select_user(card, argp);1067 }1068 return -ENOIOCTLCMD;1069}1070 1071static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,1072 const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)1073{1074 struct snd_rawmidi_runtime *runtime = substream->runtime;1075 struct snd_rawmidi_framing_tstamp *dest_ptr;1076 struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };1077 int orig_count = src_count;1078 int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);1079 int align = get_align(runtime);1080 1081 BUILD_BUG_ON(frame_size != 0x20);1082 if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))1083 return -EINVAL;1084 1085 while (src_count > align) {1086 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {1087 runtime->xruns += src_count;1088 break;1089 }1090 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)1091 frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;1092 else {1093 frame.length = get_aligned_size(runtime, src_count);1094 if (!frame.length)1095 break;1096 memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);1097 }1098 memcpy(frame.data, buffer, frame.length);1099 buffer += frame.length;1100 src_count -= frame.length;1101 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);1102 *dest_ptr = frame;1103 runtime->avail += frame_size;1104 runtime->hw_ptr += frame_size;1105 runtime->hw_ptr %= runtime->buffer_size;1106 }1107 return orig_count - src_count;1108}1109 1110static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)1111{1112 struct timespec64 ts64 = {0, 0};1113 1114 switch (substream->clock_type) {1115 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:1116 ktime_get_raw_ts64(&ts64);1117 break;1118 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:1119 ktime_get_ts64(&ts64);1120 break;1121 case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:1122 ktime_get_real_ts64(&ts64);1123 break;1124 }1125 return ts64;1126}1127 1128/**1129 * snd_rawmidi_receive - receive the input data from the device1130 * @substream: the rawmidi substream1131 * @buffer: the buffer pointer1132 * @count: the data size to read1133 *1134 * Reads the data from the internal buffer.1135 *1136 * Return: The size of read data, or a negative error code on failure.1137 */1138int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,1139 const unsigned char *buffer, int count)1140{1141 struct timespec64 ts64 = get_framing_tstamp(substream);1142 int result = 0, count1;1143 struct snd_rawmidi_runtime *runtime;1144 1145 guard(spinlock_irqsave)(&substream->lock);1146 if (!substream->opened)1147 return -EBADFD;1148 runtime = substream->runtime;1149 if (!runtime || !runtime->buffer) {1150 rmidi_dbg(substream->rmidi,1151 "snd_rawmidi_receive: input is not active!!!\n");1152 return -EINVAL;1153 }1154 1155 count = get_aligned_size(runtime, count);1156 if (!count)1157 return result;1158 1159 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {1160 result = receive_with_tstamp_framing(substream, buffer, count, &ts64);1161 } else if (count == 1) { /* special case, faster code */1162 substream->bytes++;1163 if (runtime->avail < runtime->buffer_size) {1164 runtime->buffer[runtime->hw_ptr++] = buffer[0];1165 runtime->hw_ptr %= runtime->buffer_size;1166 runtime->avail++;1167 result++;1168 } else {1169 runtime->xruns++;1170 }1171 } else {1172 substream->bytes += count;1173 count1 = runtime->buffer_size - runtime->hw_ptr;1174 if (count1 > count)1175 count1 = count;1176 if (count1 > (int)(runtime->buffer_size - runtime->avail))1177 count1 = runtime->buffer_size - runtime->avail;1178 count1 = get_aligned_size(runtime, count1);1179 if (!count1)1180 return result;1181 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);1182 runtime->hw_ptr += count1;1183 runtime->hw_ptr %= runtime->buffer_size;1184 runtime->avail += count1;1185 count -= count1;1186 result += count1;1187 if (count > 0) {1188 buffer += count1;1189 count1 = count;1190 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {1191 count1 = runtime->buffer_size - runtime->avail;1192 runtime->xruns += count - count1;1193 }1194 if (count1 > 0) {1195 memcpy(runtime->buffer, buffer, count1);1196 runtime->hw_ptr = count1;1197 runtime->avail += count1;1198 result += count1;1199 }1200 }1201 }1202 if (result > 0) {1203 if (runtime->event)1204 schedule_work(&runtime->event_work);1205 else if (__snd_rawmidi_ready(runtime))1206 wake_up(&runtime->sleep);1207 }1208 return result;1209}1210EXPORT_SYMBOL(snd_rawmidi_receive);1211 1212static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,1213 unsigned char __user *userbuf,1214 unsigned char *kernelbuf, long count)1215{1216 unsigned long flags;1217 long result = 0, count1;1218 struct snd_rawmidi_runtime *runtime = substream->runtime;1219 unsigned long appl_ptr;1220 int err = 0;1221 1222 spin_lock_irqsave(&substream->lock, flags);1223 snd_rawmidi_buffer_ref(runtime);1224 while (count > 0 && runtime->avail) {1225 count1 = runtime->buffer_size - runtime->appl_ptr;1226 if (count1 > count)1227 count1 = count;1228 if (count1 > (int)runtime->avail)1229 count1 = runtime->avail;1230 1231 /* update runtime->appl_ptr before unlocking for userbuf */1232 appl_ptr = runtime->appl_ptr;1233 runtime->appl_ptr += count1;1234 runtime->appl_ptr %= runtime->buffer_size;1235 runtime->avail -= count1;1236 1237 if (kernelbuf)1238 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);1239 if (userbuf) {1240 spin_unlock_irqrestore(&substream->lock, flags);1241 if (copy_to_user(userbuf + result,1242 runtime->buffer + appl_ptr, count1))1243 err = -EFAULT;1244 spin_lock_irqsave(&substream->lock, flags);1245 if (err)1246 goto out;1247 }1248 result += count1;1249 count -= count1;1250 }1251 out:1252 snd_rawmidi_buffer_unref(runtime);1253 spin_unlock_irqrestore(&substream->lock, flags);1254 return result > 0 ? result : err;1255}1256 1257long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,1258 unsigned char *buf, long count)1259{1260 snd_rawmidi_input_trigger(substream, 1);1261 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);1262}1263EXPORT_SYMBOL(snd_rawmidi_kernel_read);1264 1265static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,1266 loff_t *offset)1267{1268 long result;1269 int count1;1270 struct snd_rawmidi_file *rfile;1271 struct snd_rawmidi_substream *substream;1272 struct snd_rawmidi_runtime *runtime;1273 1274 rfile = file->private_data;1275 substream = rfile->input;1276 if (substream == NULL)1277 return -EIO;1278 runtime = substream->runtime;1279 snd_rawmidi_input_trigger(substream, 1);1280 result = 0;1281 while (count > 0) {1282 spin_lock_irq(&substream->lock);1283 while (!__snd_rawmidi_ready(runtime)) {1284 wait_queue_entry_t wait;1285 1286 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {1287 spin_unlock_irq(&substream->lock);1288 return result > 0 ? result : -EAGAIN;1289 }1290 init_waitqueue_entry(&wait, current);1291 add_wait_queue(&runtime->sleep, &wait);1292 set_current_state(TASK_INTERRUPTIBLE);1293 spin_unlock_irq(&substream->lock);1294 schedule();1295 remove_wait_queue(&runtime->sleep, &wait);1296 if (rfile->rmidi->card->shutdown)1297 return -ENODEV;1298 if (signal_pending(current))1299 return result > 0 ? result : -ERESTARTSYS;1300 spin_lock_irq(&substream->lock);1301 if (!runtime->avail) {1302 spin_unlock_irq(&substream->lock);1303 return result > 0 ? result : -EIO;1304 }1305 }1306 spin_unlock_irq(&substream->lock);1307 count1 = snd_rawmidi_kernel_read1(substream,1308 (unsigned char __user *)buf,1309 NULL/*kernelbuf*/,1310 count);1311 if (count1 < 0)1312 return result > 0 ? result : count1;1313 result += count1;1314 buf += count1;1315 count -= count1;1316 }1317 return result;1318}1319 1320/**1321 * snd_rawmidi_transmit_empty - check whether the output buffer is empty1322 * @substream: the rawmidi substream1323 *1324 * Return: 1 if the internal output buffer is empty, 0 if not.1325 */1326int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)1327{1328 struct snd_rawmidi_runtime *runtime;1329 1330 guard(spinlock_irqsave)(&substream->lock);1331 runtime = substream->runtime;1332 if (!substream->opened || !runtime || !runtime->buffer) {1333 rmidi_dbg(substream->rmidi,1334 "snd_rawmidi_transmit_empty: output is not active!!!\n");1335 return 1;1336 }1337 return (runtime->avail >= runtime->buffer_size);1338}1339EXPORT_SYMBOL(snd_rawmidi_transmit_empty);1340 1341/*1342 * __snd_rawmidi_transmit_peek - copy data from the internal buffer1343 * @substream: the rawmidi substream1344 * @buffer: the buffer pointer1345 * @count: data size to transfer1346 *1347 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.1348 */1349static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,1350 unsigned char *buffer, int count)1351{1352 int result, count1;1353 struct snd_rawmidi_runtime *runtime = substream->runtime;1354 1355 if (runtime->buffer == NULL) {1356 rmidi_dbg(substream->rmidi,1357 "snd_rawmidi_transmit_peek: output is not active!!!\n");1358 return -EINVAL;1359 }1360 result = 0;1361 if (runtime->avail >= runtime->buffer_size) {1362 /* warning: lowlevel layer MUST trigger down the hardware */1363 goto __skip;1364 }1365 if (count == 1) { /* special case, faster code */1366 *buffer = runtime->buffer[runtime->hw_ptr];1367 result++;1368 } else {1369 count1 = runtime->buffer_size - runtime->hw_ptr;1370 if (count1 > count)1371 count1 = count;1372 if (count1 > (int)(runtime->buffer_size - runtime->avail))1373 count1 = runtime->buffer_size - runtime->avail;1374 count1 = get_aligned_size(runtime, count1);1375 if (!count1)1376 goto __skip;1377 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);1378 count -= count1;1379 result += count1;1380 if (count > 0) {1381 if (count > (int)(runtime->buffer_size - runtime->avail - count1))1382 count = runtime->buffer_size - runtime->avail - count1;1383 count = get_aligned_size(runtime, count);1384 if (!count)1385 goto __skip;1386 memcpy(buffer + count1, runtime->buffer, count);1387 result += count;1388 }1389 }1390 __skip:1391 return result;1392}1393 1394/**1395 * snd_rawmidi_transmit_peek - copy data from the internal buffer1396 * @substream: the rawmidi substream1397 * @buffer: the buffer pointer1398 * @count: data size to transfer1399 *1400 * Copies data from the internal output buffer to the given buffer.1401 *1402 * Call this in the interrupt handler when the midi output is ready,1403 * and call snd_rawmidi_transmit_ack() after the transmission is1404 * finished.1405 *1406 * Return: The size of copied data, or a negative error code on failure.1407 */1408int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,1409 unsigned char *buffer, int count)1410{1411 guard(spinlock_irqsave)(&substream->lock);1412 if (!substream->opened || !substream->runtime)1413 return -EBADFD;1414 return __snd_rawmidi_transmit_peek(substream, buffer, count);1415}1416EXPORT_SYMBOL(snd_rawmidi_transmit_peek);1417 1418/*1419 * __snd_rawmidi_transmit_ack - acknowledge the transmission1420 * @substream: the rawmidi substream1421 * @count: the transferred count1422 *1423 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.1424 */1425static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,1426 int count)1427{1428 struct snd_rawmidi_runtime *runtime = substream->runtime;1429 1430 if (runtime->buffer == NULL) {1431 rmidi_dbg(substream->rmidi,1432 "snd_rawmidi_transmit_ack: output is not active!!!\n");1433 return -EINVAL;1434 }1435 snd_BUG_ON(runtime->avail + count > runtime->buffer_size);1436 count = get_aligned_size(runtime, count);1437 runtime->hw_ptr += count;1438 runtime->hw_ptr %= runtime->buffer_size;1439 runtime->avail += count;1440 substream->bytes += count;1441 if (count > 0) {1442 if (runtime->drain || __snd_rawmidi_ready(runtime))1443 wake_up(&runtime->sleep);1444 }1445 return count;1446}1447 1448/**1449 * snd_rawmidi_transmit_ack - acknowledge the transmission1450 * @substream: the rawmidi substream1451 * @count: the transferred count1452 *1453 * Advances the hardware pointer for the internal output buffer with1454 * the given size and updates the condition.1455 * Call after the transmission is finished.1456 *1457 * Return: The advanced size if successful, or a negative error code on failure.1458 */1459int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)1460{1461 guard(spinlock_irqsave)(&substream->lock);1462 if (!substream->opened || !substream->runtime)1463 return -EBADFD;1464 return __snd_rawmidi_transmit_ack(substream, count);1465}1466EXPORT_SYMBOL(snd_rawmidi_transmit_ack);1467 1468/**1469 * snd_rawmidi_transmit - copy from the buffer to the device1470 * @substream: the rawmidi substream1471 * @buffer: the buffer pointer1472 * @count: the data size to transfer1473 *1474 * Copies data from the buffer to the device and advances the pointer.1475 *1476 * Return: The copied size if successful, or a negative error code on failure.1477 */1478int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,1479 unsigned char *buffer, int count)1480{1481 guard(spinlock_irqsave)(&substream->lock);1482 if (!substream->opened)1483 return -EBADFD;1484 count = __snd_rawmidi_transmit_peek(substream, buffer, count);1485 if (count <= 0)1486 return count;1487 return __snd_rawmidi_transmit_ack(substream, count);1488}1489EXPORT_SYMBOL(snd_rawmidi_transmit);1490 1491/**1492 * snd_rawmidi_proceed - Discard the all pending bytes and proceed1493 * @substream: rawmidi substream1494 *1495 * Return: the number of discarded bytes1496 */1497int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)1498{1499 struct snd_rawmidi_runtime *runtime;1500 int count = 0;1501 1502 guard(spinlock_irqsave)(&substream->lock);1503 runtime = substream->runtime;1504 if (substream->opened && runtime &&1505 runtime->avail < runtime->buffer_size) {1506 count = runtime->buffer_size - runtime->avail;1507 __snd_rawmidi_transmit_ack(substream, count);1508 }1509 return count;1510}1511EXPORT_SYMBOL(snd_rawmidi_proceed);1512 1513static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,1514 const unsigned char __user *userbuf,1515 const unsigned char *kernelbuf,1516 long count)1517{1518 unsigned long flags;1519 long count1, result;1520 struct snd_rawmidi_runtime *runtime = substream->runtime;1521 unsigned long appl_ptr;1522 1523 if (!kernelbuf && !userbuf)1524 return -EINVAL;1525 if (snd_BUG_ON(!runtime->buffer))1526 return -EINVAL;1527 1528 result = 0;1529 spin_lock_irqsave(&substream->lock, flags);1530 if (substream->append) {1531 if ((long)runtime->avail < count) {1532 spin_unlock_irqrestore(&substream->lock, flags);1533 return -EAGAIN;1534 }1535 }1536 snd_rawmidi_buffer_ref(runtime);1537 while (count > 0 && runtime->avail > 0) {1538 count1 = runtime->buffer_size - runtime->appl_ptr;1539 if (count1 > count)1540 count1 = count;1541 if (count1 > (long)runtime->avail)1542 count1 = runtime->avail;1543 1544 /* update runtime->appl_ptr before unlocking for userbuf */1545 appl_ptr = runtime->appl_ptr;1546 runtime->appl_ptr += count1;1547 runtime->appl_ptr %= runtime->buffer_size;1548 runtime->avail -= count1;1549 1550 if (kernelbuf)1551 memcpy(runtime->buffer + appl_ptr,1552 kernelbuf + result, count1);1553 else if (userbuf) {1554 spin_unlock_irqrestore(&substream->lock, flags);1555 if (copy_from_user(runtime->buffer + appl_ptr,1556 userbuf + result, count1)) {1557 spin_lock_irqsave(&substream->lock, flags);1558 result = result > 0 ? result : -EFAULT;1559 goto __end;1560 }1561 spin_lock_irqsave(&substream->lock, flags);1562 }1563 result += count1;1564 count -= count1;1565 }1566 __end:1567 count1 = runtime->avail < runtime->buffer_size;1568 snd_rawmidi_buffer_unref(runtime);1569 spin_unlock_irqrestore(&substream->lock, flags);1570 if (count1)1571 snd_rawmidi_output_trigger(substream, 1);1572 return result;1573}1574 1575long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,1576 const unsigned char *buf, long count)1577{1578 return snd_rawmidi_kernel_write1(substream, NULL, buf, count);1579}1580EXPORT_SYMBOL(snd_rawmidi_kernel_write);1581 1582static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,1583 size_t count, loff_t *offset)1584{1585 long result, timeout;1586 int count1;1587 struct snd_rawmidi_file *rfile;1588 struct snd_rawmidi_runtime *runtime;1589 struct snd_rawmidi_substream *substream;1590 1591 rfile = file->private_data;1592 substream = rfile->output;1593 runtime = substream->runtime;1594 /* we cannot put an atomic message to our buffer */1595 if (substream->append && count > runtime->buffer_size)1596 return -EIO;1597 result = 0;1598 while (count > 0) {1599 spin_lock_irq(&substream->lock);1600 while (!snd_rawmidi_ready_append(substream, count)) {1601 wait_queue_entry_t wait;1602 1603 if (file->f_flags & O_NONBLOCK) {1604 spin_unlock_irq(&substream->lock);1605 return result > 0 ? result : -EAGAIN;1606 }1607 init_waitqueue_entry(&wait, current);1608 add_wait_queue(&runtime->sleep, &wait);1609 set_current_state(TASK_INTERRUPTIBLE);1610 spin_unlock_irq(&substream->lock);1611 timeout = schedule_timeout(30 * HZ);1612 remove_wait_queue(&runtime->sleep, &wait);1613 if (rfile->rmidi->card->shutdown)1614 return -ENODEV;1615 if (signal_pending(current))1616 return result > 0 ? result : -ERESTARTSYS;1617 spin_lock_irq(&substream->lock);1618 if (!runtime->avail && !timeout) {1619 spin_unlock_irq(&substream->lock);1620 return result > 0 ? result : -EIO;1621 }1622 }1623 spin_unlock_irq(&substream->lock);1624 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);1625 if (count1 < 0)1626 return result > 0 ? result : count1;1627 result += count1;1628 buf += count1;1629 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))1630 break;1631 count -= count1;1632 }1633 if (file->f_flags & O_DSYNC) {1634 spin_lock_irq(&substream->lock);1635 while (runtime->avail != runtime->buffer_size) {1636 wait_queue_entry_t wait;1637 unsigned int last_avail = runtime->avail;1638 1639 init_waitqueue_entry(&wait, current);1640 add_wait_queue(&runtime->sleep, &wait);1641 set_current_state(TASK_INTERRUPTIBLE);1642 spin_unlock_irq(&substream->lock);1643 timeout = schedule_timeout(30 * HZ);1644 remove_wait_queue(&runtime->sleep, &wait);1645 if (signal_pending(current))1646 return result > 0 ? result : -ERESTARTSYS;1647 if (runtime->avail == last_avail && !timeout)1648 return result > 0 ? result : -EIO;1649 spin_lock_irq(&substream->lock);1650 }1651 spin_unlock_irq(&substream->lock);1652 }1653 return result;1654}1655 1656static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)1657{1658 struct snd_rawmidi_file *rfile;1659 struct snd_rawmidi_runtime *runtime;1660 __poll_t mask;1661 1662 rfile = file->private_data;1663 if (rfile->input != NULL) {1664 runtime = rfile->input->runtime;1665 snd_rawmidi_input_trigger(rfile->input, 1);1666 poll_wait(file, &runtime->sleep, wait);1667 }1668 if (rfile->output != NULL) {1669 runtime = rfile->output->runtime;1670 poll_wait(file, &runtime->sleep, wait);1671 }1672 mask = 0;1673 if (rfile->input != NULL) {1674 if (snd_rawmidi_ready(rfile->input))1675 mask |= EPOLLIN | EPOLLRDNORM;1676 }1677 if (rfile->output != NULL) {1678 if (snd_rawmidi_ready(rfile->output))1679 mask |= EPOLLOUT | EPOLLWRNORM;1680 }1681 return mask;1682}1683 1684/*1685 */1686#ifdef CONFIG_COMPAT1687#include "rawmidi_compat.c"1688#else1689#define snd_rawmidi_ioctl_compat NULL1690#endif1691 1692/*1693 */1694 1695static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,1696 struct snd_info_buffer *buffer)1697{1698 struct snd_rawmidi *rmidi;1699 struct snd_rawmidi_substream *substream;1700 struct snd_rawmidi_runtime *runtime;1701 unsigned long buffer_size, avail, xruns;1702 unsigned int clock_type;1703 static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };1704 1705 rmidi = entry->private_data;1706 snd_iprintf(buffer, "%s\n\n", rmidi->name);1707 if (IS_ENABLED(CONFIG_SND_UMP))1708 snd_iprintf(buffer, "Type: %s\n",1709 rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");1710 if (rmidi->ops && rmidi->ops->proc_read)1711 rmidi->ops->proc_read(entry, buffer);1712 guard(mutex)(&rmidi->open_mutex);1713 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {1714 list_for_each_entry(substream,1715 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,1716 list) {1717 snd_iprintf(buffer,1718 "Output %d\n"1719 " Tx bytes : %lu\n",1720 substream->number,1721 (unsigned long) substream->bytes);1722 if (substream->opened) {1723 snd_iprintf(buffer,1724 " Owner PID : %d\n",1725 pid_vnr(substream->pid));1726 runtime = substream->runtime;1727 scoped_guard(spinlock_irq, &substream->lock) {1728 buffer_size = runtime->buffer_size;1729 avail = runtime->avail;1730 }1731 snd_iprintf(buffer,1732 " Mode : %s\n"1733 " Buffer size : %lu\n"1734 " Avail : %lu\n",1735 runtime->oss ? "OSS compatible" : "native",1736 buffer_size, avail);1737 }1738 }1739 }1740 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {1741 list_for_each_entry(substream,1742 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,1743 list) {1744 snd_iprintf(buffer,1745 "Input %d\n"1746 " Rx bytes : %lu\n",1747 substream->number,1748 (unsigned long) substream->bytes);1749 if (substream->opened) {1750 snd_iprintf(buffer,1751 " Owner PID : %d\n",1752 pid_vnr(substream->pid));1753 runtime = substream->runtime;1754 scoped_guard(spinlock_irq, &substream->lock) {1755 buffer_size = runtime->buffer_size;1756 avail = runtime->avail;1757 xruns = runtime->xruns;1758 }1759 snd_iprintf(buffer,1760 " Buffer size : %lu\n"1761 " Avail : %lu\n"1762 " Overruns : %lu\n",1763 buffer_size, avail, xruns);1764 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {1765 clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;1766 if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))1767 snd_iprintf(buffer,1768 " Framing : tstamp\n"1769 " Clock type : %s\n",1770 clock_names[clock_type]);1771 }1772 }1773 }1774 }1775}1776 1777/*1778 * Register functions1779 */1780 1781static const struct file_operations snd_rawmidi_f_ops = {1782 .owner = THIS_MODULE,1783 .read = snd_rawmidi_read,1784 .write = snd_rawmidi_write,1785 .open = snd_rawmidi_open,1786 .release = snd_rawmidi_release,1787 .poll = snd_rawmidi_poll,1788 .unlocked_ioctl = snd_rawmidi_ioctl,1789 .compat_ioctl = snd_rawmidi_ioctl_compat,1790};1791 1792static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,1793 struct snd_rawmidi_str *stream,1794 int direction,1795 int count)1796{1797 struct snd_rawmidi_substream *substream;1798 int idx;1799 1800 for (idx = 0; idx < count; idx++) {1801 substream = kzalloc(sizeof(*substream), GFP_KERNEL);1802 if (!substream)1803 return -ENOMEM;1804 substream->stream = direction;1805 substream->number = idx;1806 substream->rmidi = rmidi;1807 substream->pstr = stream;1808 spin_lock_init(&substream->lock);1809 list_add_tail(&substream->list, &stream->substreams);1810 stream->substream_count++;1811 }1812 return 0;1813}1814 1815/* used for both rawmidi and ump */1816int snd_rawmidi_init(struct snd_rawmidi *rmidi,1817 struct snd_card *card, char *id, int device,1818 int output_count, int input_count,1819 unsigned int info_flags)1820{1821 int err;1822 static const struct snd_device_ops ops = {1823 .dev_free = snd_rawmidi_dev_free,1824 .dev_register = snd_rawmidi_dev_register,1825 .dev_disconnect = snd_rawmidi_dev_disconnect,1826 };1827 1828 rmidi->card = card;1829 rmidi->device = device;1830 mutex_init(&rmidi->open_mutex);1831 init_waitqueue_head(&rmidi->open_wait);1832 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);1833 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);1834 rmidi->info_flags = info_flags;1835 1836 if (id != NULL)1837 strscpy(rmidi->id, id, sizeof(rmidi->id));1838 1839 err = snd_device_alloc(&rmidi->dev, card);1840 if (err < 0)1841 return err;1842 if (rawmidi_is_ump(rmidi))1843 dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);1844 else1845 dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);1846 1847 err = snd_rawmidi_alloc_substreams(rmidi,1848 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],1849 SNDRV_RAWMIDI_STREAM_INPUT,1850 input_count);1851 if (err < 0)1852 return err;1853 err = snd_rawmidi_alloc_substreams(rmidi,1854 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],1855 SNDRV_RAWMIDI_STREAM_OUTPUT,1856 output_count);1857 if (err < 0)1858 return err;1859 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);1860 if (err < 0)1861 return err;1862 return 0;1863}1864EXPORT_SYMBOL_GPL(snd_rawmidi_init);1865 1866/**1867 * snd_rawmidi_new - create a rawmidi instance1868 * @card: the card instance1869 * @id: the id string1870 * @device: the device index1871 * @output_count: the number of output streams1872 * @input_count: the number of input streams1873 * @rrawmidi: the pointer to store the new rawmidi instance1874 *1875 * Creates a new rawmidi instance.1876 * Use snd_rawmidi_set_ops() to set the operators to the new instance.1877 *1878 * Return: Zero if successful, or a negative error code on failure.1879 */1880int snd_rawmidi_new(struct snd_card *card, char *id, int device,1881 int output_count, int input_count,1882 struct snd_rawmidi **rrawmidi)1883{1884 struct snd_rawmidi *rmidi;1885 int err;1886 1887 if (rrawmidi)1888 *rrawmidi = NULL;1889 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);1890 if (!rmidi)1891 return -ENOMEM;1892 err = snd_rawmidi_init(rmidi, card, id, device,1893 output_count, input_count, 0);1894 if (err < 0) {1895 snd_rawmidi_free(rmidi);1896 return err;1897 }1898 if (rrawmidi)1899 *rrawmidi = rmidi;1900 return 0;1901}1902EXPORT_SYMBOL(snd_rawmidi_new);1903 1904static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)1905{1906 struct snd_rawmidi_substream *substream;1907 1908 while (!list_empty(&stream->substreams)) {1909 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);1910 list_del(&substream->list);1911 kfree(substream);1912 }1913}1914 1915/* called from ump.c, too */1916int snd_rawmidi_free(struct snd_rawmidi *rmidi)1917{1918 if (!rmidi)1919 return 0;1920 1921 snd_info_free_entry(rmidi->proc_entry);1922 rmidi->proc_entry = NULL;1923 if (rmidi->ops && rmidi->ops->dev_unregister)1924 rmidi->ops->dev_unregister(rmidi);1925 1926 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);1927 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);1928 if (rmidi->private_free)1929 rmidi->private_free(rmidi);1930 put_device(rmidi->dev);1931 kfree(rmidi);1932 return 0;1933}1934EXPORT_SYMBOL_GPL(snd_rawmidi_free);1935 1936static int snd_rawmidi_dev_free(struct snd_device *device)1937{1938 struct snd_rawmidi *rmidi = device->device_data;1939 1940 return snd_rawmidi_free(rmidi);1941}1942 1943#if IS_ENABLED(CONFIG_SND_SEQUENCER)1944static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)1945{1946 struct snd_rawmidi *rmidi = device->private_data;1947 1948 rmidi->seq_dev = NULL;1949}1950#endif1951 1952static int snd_rawmidi_dev_register(struct snd_device *device)1953{1954 int err;1955 struct snd_info_entry *entry;1956 char name[16];1957 struct snd_rawmidi *rmidi = device->device_data;1958 1959 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)1960 return -ENOMEM;1961 err = 0;1962 scoped_guard(mutex, ®ister_mutex) {1963 if (snd_rawmidi_search(rmidi->card, rmidi->device))1964 err = -EBUSY;1965 else1966 list_add_tail(&rmidi->list, &snd_rawmidi_devices);1967 }1968 if (err < 0)1969 return err;1970 1971 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,1972 rmidi->card, rmidi->device,1973 &snd_rawmidi_f_ops, rmidi, rmidi->dev);1974 if (err < 0) {1975 rmidi_err(rmidi, "unable to register\n");1976 goto error;1977 }1978 if (rmidi->ops && rmidi->ops->dev_register) {1979 err = rmidi->ops->dev_register(rmidi);1980 if (err < 0)1981 goto error_unregister;1982 }1983#ifdef CONFIG_SND_OSSEMUL1984 rmidi->ossreg = 0;1985 if (!rawmidi_is_ump(rmidi) &&1986 (int)rmidi->device == midi_map[rmidi->card->number]) {1987 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,1988 rmidi->card, 0, &snd_rawmidi_f_ops,1989 rmidi) < 0) {1990 rmidi_err(rmidi,1991 "unable to register OSS rawmidi device %i:%i\n",1992 rmidi->card->number, 0);1993 } else {1994 rmidi->ossreg++;1995#ifdef SNDRV_OSS_INFO_DEV_MIDI1996 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);1997#endif1998 }1999 }2000 if (!rawmidi_is_ump(rmidi) &&2001 (int)rmidi->device == amidi_map[rmidi->card->number]) {2002 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,2003 rmidi->card, 1, &snd_rawmidi_f_ops,2004 rmidi) < 0) {2005 rmidi_err(rmidi,2006 "unable to register OSS rawmidi device %i:%i\n",2007 rmidi->card->number, 1);2008 } else {2009 rmidi->ossreg++;2010 }2011 }2012#endif /* CONFIG_SND_OSSEMUL */2013 sprintf(name, "midi%d", rmidi->device);2014 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);2015 if (entry) {2016 entry->private_data = rmidi;2017 entry->c.text.read = snd_rawmidi_proc_info_read;2018 if (snd_info_register(entry) < 0) {2019 snd_info_free_entry(entry);2020 entry = NULL;2021 }2022 }2023 rmidi->proc_entry = entry;2024#if IS_ENABLED(CONFIG_SND_SEQUENCER)2025 /* no own registration mechanism? */2026 if (!rmidi->ops || !rmidi->ops->dev_register) {2027 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {2028 rmidi->seq_dev->private_data = rmidi;2029 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;2030 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);2031 snd_device_register(rmidi->card, rmidi->seq_dev);2032 }2033 }2034#endif2035 return 0;2036 2037 error_unregister:2038 snd_unregister_device(rmidi->dev);2039 error:2040 scoped_guard(mutex, ®ister_mutex)2041 list_del(&rmidi->list);2042 return err;2043}2044 2045static int snd_rawmidi_dev_disconnect(struct snd_device *device)2046{2047 struct snd_rawmidi *rmidi = device->device_data;2048 int dir;2049 2050 guard(mutex)(®ister_mutex);2051 guard(mutex)(&rmidi->open_mutex);2052 wake_up(&rmidi->open_wait);2053 list_del_init(&rmidi->list);2054 for (dir = 0; dir < 2; dir++) {2055 struct snd_rawmidi_substream *s;2056 2057 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {2058 if (s->runtime)2059 wake_up(&s->runtime->sleep);2060 }2061 }2062 2063#ifdef CONFIG_SND_OSSEMUL2064 if (rmidi->ossreg) {2065 if ((int)rmidi->device == midi_map[rmidi->card->number]) {2066 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);2067#ifdef SNDRV_OSS_INFO_DEV_MIDI2068 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);2069#endif2070 }2071 if ((int)rmidi->device == amidi_map[rmidi->card->number])2072 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);2073 rmidi->ossreg = 0;2074 }2075#endif /* CONFIG_SND_OSSEMUL */2076 snd_unregister_device(rmidi->dev);2077 return 0;2078}2079 2080/**2081 * snd_rawmidi_set_ops - set the rawmidi operators2082 * @rmidi: the rawmidi instance2083 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX2084 * @ops: the operator table2085 *2086 * Sets the rawmidi operators for the given stream direction.2087 */2088void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,2089 const struct snd_rawmidi_ops *ops)2090{2091 struct snd_rawmidi_substream *substream;2092 2093 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)2094 substream->ops = ops;2095}2096EXPORT_SYMBOL(snd_rawmidi_set_ops);2097 2098/*2099 * ENTRY functions2100 */2101 2102static int __init alsa_rawmidi_init(void)2103{2104 2105 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);2106 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);2107#ifdef CONFIG_SND_OSSEMUL2108 { int i;2109 /* check device map table */2110 for (i = 0; i < SNDRV_CARDS; i++) {2111 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {2112 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",2113 i, midi_map[i]);2114 midi_map[i] = 0;2115 }2116 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {2117 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",2118 i, amidi_map[i]);2119 amidi_map[i] = 1;2120 }2121 }2122 }2123#endif /* CONFIG_SND_OSSEMUL */2124 return 0;2125}2126 2127static void __exit alsa_rawmidi_exit(void)2128{2129 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);2130 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);2131}2132 2133module_init(alsa_rawmidi_init)2134module_exit(alsa_rawmidi_exit)2135