1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Abstract layer for MIDI v1.0 stream
   4 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5 */
   6
   7#include <sound/core.h>
   8#include <linux/major.h>
   9#include <linux/init.h>
  10#include <linux/sched/signal.h>
  11#include <linux/slab.h>
  12#include <linux/time.h>
  13#include <linux/wait.h>
  14#include <linux/mutex.h>
  15#include <linux/module.h>
  16#include <linux/delay.h>
  17#include <linux/mm.h>
  18#include <linux/nospec.h>
  19#include <sound/rawmidi.h>
  20#include <sound/info.h>
  21#include <sound/control.h>
  22#include <sound/minors.h>
  23#include <sound/initval.h>
  24#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_OSSEMUL
  31static 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	else
 174		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	else
 193		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		else
 284			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 it
 305 */
 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_OSSEMUL
 452	} else if (maj == SOUND_MAJOR) {
 453		rmidi = snd_lookup_oss_minor_data(iminor(inode),
 454						  SNDRV_OSS_DEVICE_TYPE_MIDI);
 455#endif
 456	} else
 457		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		} else
 494			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_OSSEMUL
 514	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#endif
 519	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 message
 547				 * to shut the device up
 548				 */
 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)(&register_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		spin_lock_irq(&substream->lock);
 728		if (runtime->buffer_ref) {
 729			spin_unlock_irq(&substream->lock);
 730			kvfree(newbuf);
 731			return -EBUSY;
 732		}
 733		oldbuf = runtime->buffer;
 734		runtime->buffer = newbuf;
 735		runtime->buffer_size = params->buffer_size;
 736		__reset_runtime_ptrs(runtime, is_input);
 737		spin_unlock_irq(&substream->lock);
 738		kvfree(oldbuf);
 739	}
 740	runtime->avail_min = params->avail_min;
 741	return 0;
 742}
 743
 744int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 745			      struct snd_rawmidi_params *params)
 746{
 747	int err;
 748
 749	snd_rawmidi_drain_output(substream);
 750	guard(mutex)(&substream->rmidi->open_mutex);
 751	if (substream->append && substream->use_count > 1)
 752		return -EBUSY;
 753	err = resize_runtime_buffer(substream, params, false);
 
 
 754	if (!err)
 755		substream->active_sensing = !params->no_active_sensing;
 
 756	return err;
 757}
 758EXPORT_SYMBOL(snd_rawmidi_output_params);
 759
 760int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 761			     struct snd_rawmidi_params *params)
 762{
 763	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 764	unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
 765	int err;
 766
 767	snd_rawmidi_drain_input(substream);
 768	guard(mutex)(&substream->rmidi->open_mutex);
 769	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
 770		err = -EINVAL;
 771	else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
 772		err = -EINVAL;
 773	else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
 774		err = -EINVAL;
 775	else
 776		err = resize_runtime_buffer(substream, params, true);
 777
 778	if (!err) {
 779		substream->framing = framing;
 780		substream->clock_type = clock_type;
 781	}
 
 782	return 0;
 783}
 784EXPORT_SYMBOL(snd_rawmidi_input_params);
 785
 786static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 787				     struct snd_rawmidi_status64 *status)
 788{
 789	struct snd_rawmidi_runtime *runtime = substream->runtime;
 790
 791	memset(status, 0, sizeof(*status));
 792	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 793	guard(spinlock_irq)(&substream->lock);
 794	status->avail = runtime->avail;
 
 795	return 0;
 796}
 797
 798static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 799				    struct snd_rawmidi_status64 *status)
 800{
 801	struct snd_rawmidi_runtime *runtime = substream->runtime;
 802
 803	memset(status, 0, sizeof(*status));
 804	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 805	guard(spinlock_irq)(&substream->lock);
 806	status->avail = runtime->avail;
 807	status->xruns = runtime->xruns;
 808	runtime->xruns = 0;
 
 809	return 0;
 810}
 811
 812static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 813				      struct snd_rawmidi_status32 __user *argp)
 814{
 815	int err = 0;
 816	struct snd_rawmidi_status32 __user *status = argp;
 817	struct snd_rawmidi_status32 status32;
 818	struct snd_rawmidi_status64 status64;
 819
 820	if (copy_from_user(&status32, argp,
 821			   sizeof(struct snd_rawmidi_status32)))
 822		return -EFAULT;
 823
 824	switch (status32.stream) {
 825	case SNDRV_RAWMIDI_STREAM_OUTPUT:
 826		if (rfile->output == NULL)
 827			return -EINVAL;
 828		err = snd_rawmidi_output_status(rfile->output, &status64);
 829		break;
 830	case SNDRV_RAWMIDI_STREAM_INPUT:
 831		if (rfile->input == NULL)
 832			return -EINVAL;
 833		err = snd_rawmidi_input_status(rfile->input, &status64);
 834		break;
 835	default:
 836		return -EINVAL;
 837	}
 838	if (err < 0)
 839		return err;
 840
 841	status32 = (struct snd_rawmidi_status32) {
 842		.stream = status64.stream,
 843		.tstamp_sec = status64.tstamp_sec,
 844		.tstamp_nsec = status64.tstamp_nsec,
 845		.avail = status64.avail,
 846		.xruns = status64.xruns,
 847	};
 848
 849	if (copy_to_user(status, &status32, sizeof(*status)))
 850		return -EFAULT;
 851
 852	return 0;
 853}
 854
 855static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 856				      struct snd_rawmidi_status64 __user *argp)
 857{
 858	int err = 0;
 859	struct snd_rawmidi_status64 status;
 860
 861	if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 862		return -EFAULT;
 863
 864	switch (status.stream) {
 865	case SNDRV_RAWMIDI_STREAM_OUTPUT:
 866		if (rfile->output == NULL)
 867			return -EINVAL;
 868		err = snd_rawmidi_output_status(rfile->output, &status);
 869		break;
 870	case SNDRV_RAWMIDI_STREAM_INPUT:
 871		if (rfile->input == NULL)
 872			return -EINVAL;
 873		err = snd_rawmidi_input_status(rfile->input, &status);
 874		break;
 875	default:
 876		return -EINVAL;
 877	}
 878	if (err < 0)
 879		return err;
 880	if (copy_to_user(argp, &status,
 881			 sizeof(struct snd_rawmidi_status64)))
 882		return -EFAULT;
 883	return 0;
 884}
 885
 886static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 887{
 888	struct snd_rawmidi_file *rfile;
 889	struct snd_rawmidi *rmidi;
 890	void __user *argp = (void __user *)arg;
 891
 892	rfile = file->private_data;
 893	if (((cmd >> 8) & 0xff) != 'W')
 894		return -ENOTTY;
 895	switch (cmd) {
 896	case SNDRV_RAWMIDI_IOCTL_PVERSION:
 897		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 898	case SNDRV_RAWMIDI_IOCTL_INFO:
 899	{
 900		int stream;
 901		struct snd_rawmidi_info __user *info = argp;
 902
 903		if (get_user(stream, &info->stream))
 904			return -EFAULT;
 905		switch (stream) {
 906		case SNDRV_RAWMIDI_STREAM_INPUT:
 907			return snd_rawmidi_info_user(rfile->input, info);
 908		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 909			return snd_rawmidi_info_user(rfile->output, info);
 910		default:
 911			return -EINVAL;
 912		}
 913	}
 914	case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
 915		if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
 916			return -EFAULT;
 917		return 0;
 918
 919	case SNDRV_RAWMIDI_IOCTL_PARAMS:
 920	{
 921		struct snd_rawmidi_params params;
 922
 923		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 924			return -EFAULT;
 925		if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
 926			params.mode = 0;
 927			memset(params.reserved, 0, sizeof(params.reserved));
 928		}
 929		switch (params.stream) {
 930		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 931			if (rfile->output == NULL)
 932				return -EINVAL;
 933			return snd_rawmidi_output_params(rfile->output, &params);
 934		case SNDRV_RAWMIDI_STREAM_INPUT:
 935			if (rfile->input == NULL)
 936				return -EINVAL;
 937			return snd_rawmidi_input_params(rfile->input, &params);
 938		default:
 939			return -EINVAL;
 940		}
 941	}
 942	case SNDRV_RAWMIDI_IOCTL_STATUS32:
 943		return snd_rawmidi_ioctl_status32(rfile, argp);
 944	case SNDRV_RAWMIDI_IOCTL_STATUS64:
 945		return snd_rawmidi_ioctl_status64(rfile, argp);
 946	case SNDRV_RAWMIDI_IOCTL_DROP:
 947	{
 948		int val;
 949
 950		if (get_user(val, (int __user *) argp))
 951			return -EFAULT;
 952		switch (val) {
 953		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 954			if (rfile->output == NULL)
 955				return -EINVAL;
 956			return snd_rawmidi_drop_output(rfile->output);
 957		default:
 958			return -EINVAL;
 959		}
 960	}
 961	case SNDRV_RAWMIDI_IOCTL_DRAIN:
 962	{
 963		int val;
 964
 965		if (get_user(val, (int __user *) argp))
 966			return -EFAULT;
 967		switch (val) {
 968		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 969			if (rfile->output == NULL)
 970				return -EINVAL;
 971			return snd_rawmidi_drain_output(rfile->output);
 972		case SNDRV_RAWMIDI_STREAM_INPUT:
 973			if (rfile->input == NULL)
 974				return -EINVAL;
 975			return snd_rawmidi_drain_input(rfile->input);
 976		default:
 977			return -EINVAL;
 978		}
 979	}
 980	default:
 981		rmidi = rfile->rmidi;
 982		if (rmidi->ops && rmidi->ops->ioctl)
 983			return rmidi->ops->ioctl(rmidi, cmd, argp);
 984		rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
 985	}
 986	return -ENOTTY;
 987}
 988
 989/* ioctl to find the next device; either legacy or UMP depending on @find_ump */
 990static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
 991				   bool find_ump)
 992
 993{
 994	struct snd_rawmidi *rmidi;
 995	int device;
 996	bool is_ump;
 997
 998	if (get_user(device, argp))
 999		return -EFAULT;
1000	if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1001		device = SNDRV_RAWMIDI_DEVICES - 1;
1002	scoped_guard(mutex, &register_mutex) {
1003		device = device < 0 ? 0 : device + 1;
1004		for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
1005			rmidi = snd_rawmidi_search(card, device);
1006			if (!rmidi)
1007				continue;
1008			is_ump = rawmidi_is_ump(rmidi);
1009			if (find_ump == is_ump)
1010				break;
1011		}
1012		if (device == SNDRV_RAWMIDI_DEVICES)
1013			device = -1;
1014	}
1015	if (put_user(device, argp))
1016		return -EFAULT;
1017	return 0;
1018}
1019
1020#if IS_ENABLED(CONFIG_SND_UMP)
1021/* inquiry of UMP endpoint and block info via control API */
1022static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
1023				      void __user *argp)
1024{
1025	struct snd_ump_endpoint_info __user *info = argp;
1026	struct snd_rawmidi *rmidi;
1027	int device;
1028
1029	if (get_user(device, &info->device))
1030		return -EFAULT;
1031	guard(mutex)(&register_mutex);
1032	rmidi = snd_rawmidi_search(card, device);
1033	if (rmidi && rmidi->ops && rmidi->ops->ioctl)
1034		return rmidi->ops->ioctl(rmidi, cmd, argp);
1035	else
1036		return -ENXIO;
1037}
1038#endif
1039
1040static int snd_rawmidi_control_ioctl(struct snd_card *card,
1041				     struct snd_ctl_file *control,
1042				     unsigned int cmd,
1043				     unsigned long arg)
1044{
1045	void __user *argp = (void __user *)arg;
1046
1047	switch (cmd) {
1048	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1049		return snd_rawmidi_next_device(card, argp, false);
1050#if IS_ENABLED(CONFIG_SND_UMP)
1051	case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
1052		return snd_rawmidi_next_device(card, argp, true);
1053	case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
1054		return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
1055	case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
1056		return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
1057#endif
 
 
 
 
 
 
 
 
 
 
 
 
1058	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1059	{
1060		int val;
1061
1062		if (get_user(val, (int __user *)argp))
1063			return -EFAULT;
1064		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1065		return 0;
1066	}
1067	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1068		return snd_rawmidi_info_select_user(card, argp);
1069	}
1070	return -ENOIOCTLCMD;
1071}
1072
1073static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1074			const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1075{
1076	struct snd_rawmidi_runtime *runtime = substream->runtime;
1077	struct snd_rawmidi_framing_tstamp *dest_ptr;
1078	struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1079	int orig_count = src_count;
1080	int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1081	int align = get_align(runtime);
1082
1083	BUILD_BUG_ON(frame_size != 0x20);
1084	if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1085		return -EINVAL;
1086
1087	while (src_count > align) {
1088		if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1089			runtime->xruns += src_count;
1090			break;
1091		}
1092		if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1093			frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1094		else {
1095			frame.length = get_aligned_size(runtime, src_count);
1096			if (!frame.length)
1097				break;
1098			memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1099		}
1100		memcpy(frame.data, buffer, frame.length);
1101		buffer += frame.length;
1102		src_count -= frame.length;
1103		dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1104		*dest_ptr = frame;
1105		runtime->avail += frame_size;
1106		runtime->hw_ptr += frame_size;
1107		runtime->hw_ptr %= runtime->buffer_size;
1108	}
1109	return orig_count - src_count;
1110}
1111
1112static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1113{
1114	struct timespec64 ts64 = {0, 0};
1115
1116	switch (substream->clock_type) {
1117	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1118		ktime_get_raw_ts64(&ts64);
1119		break;
1120	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1121		ktime_get_ts64(&ts64);
1122		break;
1123	case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1124		ktime_get_real_ts64(&ts64);
1125		break;
1126	}
1127	return ts64;
1128}
1129
1130/**
1131 * snd_rawmidi_receive - receive the input data from the device
1132 * @substream: the rawmidi substream
1133 * @buffer: the buffer pointer
1134 * @count: the data size to read
1135 *
1136 * Reads the data from the internal buffer.
1137 *
1138 * Return: The size of read data, or a negative error code on failure.
1139 */
1140int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1141			const unsigned char *buffer, int count)
1142{
 
1143	struct timespec64 ts64 = get_framing_tstamp(substream);
1144	int result = 0, count1;
1145	struct snd_rawmidi_runtime *runtime;
1146
1147	guard(spinlock_irqsave)(&substream->lock);
1148	if (!substream->opened)
1149		return -EBADFD;
 
 
1150	runtime = substream->runtime;
1151	if (!runtime || !runtime->buffer) {
1152		rmidi_dbg(substream->rmidi,
1153			  "snd_rawmidi_receive: input is not active!!!\n");
1154		return -EINVAL;
 
1155	}
1156
1157	count = get_aligned_size(runtime, count);
1158	if (!count)
1159		return result;
1160
1161	if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1162		result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1163	} else if (count == 1) {	/* special case, faster code */
1164		substream->bytes++;
1165		if (runtime->avail < runtime->buffer_size) {
1166			runtime->buffer[runtime->hw_ptr++] = buffer[0];
1167			runtime->hw_ptr %= runtime->buffer_size;
1168			runtime->avail++;
1169			result++;
1170		} else {
1171			runtime->xruns++;
1172		}
1173	} else {
1174		substream->bytes += count;
1175		count1 = runtime->buffer_size - runtime->hw_ptr;
1176		if (count1 > count)
1177			count1 = count;
1178		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1179			count1 = runtime->buffer_size - runtime->avail;
1180		count1 = get_aligned_size(runtime, count1);
1181		if (!count1)
1182			return result;
1183		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1184		runtime->hw_ptr += count1;
1185		runtime->hw_ptr %= runtime->buffer_size;
1186		runtime->avail += count1;
1187		count -= count1;
1188		result += count1;
1189		if (count > 0) {
1190			buffer += count1;
1191			count1 = count;
1192			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1193				count1 = runtime->buffer_size - runtime->avail;
1194				runtime->xruns += count - count1;
1195			}
1196			if (count1 > 0) {
1197				memcpy(runtime->buffer, buffer, count1);
1198				runtime->hw_ptr = count1;
1199				runtime->avail += count1;
1200				result += count1;
1201			}
1202		}
1203	}
1204	if (result > 0) {
1205		if (runtime->event)
1206			schedule_work(&runtime->event_work);
1207		else if (__snd_rawmidi_ready(runtime))
1208			wake_up(&runtime->sleep);
1209	}
 
 
1210	return result;
1211}
1212EXPORT_SYMBOL(snd_rawmidi_receive);
1213
1214static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1215				     unsigned char __user *userbuf,
1216				     unsigned char *kernelbuf, long count)
1217{
1218	unsigned long flags;
1219	long result = 0, count1;
1220	struct snd_rawmidi_runtime *runtime = substream->runtime;
1221	unsigned long appl_ptr;
1222	int err = 0;
1223
1224	spin_lock_irqsave(&substream->lock, flags);
1225	snd_rawmidi_buffer_ref(runtime);
1226	while (count > 0 && runtime->avail) {
1227		count1 = runtime->buffer_size - runtime->appl_ptr;
1228		if (count1 > count)
1229			count1 = count;
1230		if (count1 > (int)runtime->avail)
1231			count1 = runtime->avail;
1232
1233		/* update runtime->appl_ptr before unlocking for userbuf */
1234		appl_ptr = runtime->appl_ptr;
1235		runtime->appl_ptr += count1;
1236		runtime->appl_ptr %= runtime->buffer_size;
1237		runtime->avail -= count1;
1238
1239		if (kernelbuf)
1240			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1241		if (userbuf) {
1242			spin_unlock_irqrestore(&substream->lock, flags);
1243			if (copy_to_user(userbuf + result,
1244					 runtime->buffer + appl_ptr, count1))
1245				err = -EFAULT;
1246			spin_lock_irqsave(&substream->lock, flags);
1247			if (err)
1248				goto out;
1249		}
1250		result += count1;
1251		count -= count1;
1252	}
1253 out:
1254	snd_rawmidi_buffer_unref(runtime);
1255	spin_unlock_irqrestore(&substream->lock, flags);
1256	return result > 0 ? result : err;
1257}
1258
1259long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1260			     unsigned char *buf, long count)
1261{
1262	snd_rawmidi_input_trigger(substream, 1);
1263	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1264}
1265EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1266
1267static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1268				loff_t *offset)
1269{
1270	long result;
1271	int count1;
1272	struct snd_rawmidi_file *rfile;
1273	struct snd_rawmidi_substream *substream;
1274	struct snd_rawmidi_runtime *runtime;
1275
1276	rfile = file->private_data;
1277	substream = rfile->input;
1278	if (substream == NULL)
1279		return -EIO;
1280	runtime = substream->runtime;
1281	snd_rawmidi_input_trigger(substream, 1);
1282	result = 0;
1283	while (count > 0) {
1284		spin_lock_irq(&substream->lock);
1285		while (!__snd_rawmidi_ready(runtime)) {
1286			wait_queue_entry_t wait;
1287
1288			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1289				spin_unlock_irq(&substream->lock);
1290				return result > 0 ? result : -EAGAIN;
1291			}
1292			init_waitqueue_entry(&wait, current);
1293			add_wait_queue(&runtime->sleep, &wait);
1294			set_current_state(TASK_INTERRUPTIBLE);
1295			spin_unlock_irq(&substream->lock);
1296			schedule();
1297			remove_wait_queue(&runtime->sleep, &wait);
1298			if (rfile->rmidi->card->shutdown)
1299				return -ENODEV;
1300			if (signal_pending(current))
1301				return result > 0 ? result : -ERESTARTSYS;
1302			spin_lock_irq(&substream->lock);
1303			if (!runtime->avail) {
1304				spin_unlock_irq(&substream->lock);
1305				return result > 0 ? result : -EIO;
1306			}
1307		}
1308		spin_unlock_irq(&substream->lock);
1309		count1 = snd_rawmidi_kernel_read1(substream,
1310						  (unsigned char __user *)buf,
1311						  NULL/*kernelbuf*/,
1312						  count);
1313		if (count1 < 0)
1314			return result > 0 ? result : count1;
1315		result += count1;
1316		buf += count1;
1317		count -= count1;
1318	}
1319	return result;
1320}
1321
1322/**
1323 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1324 * @substream: the rawmidi substream
1325 *
1326 * Return: 1 if the internal output buffer is empty, 0 if not.
1327 */
1328int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1329{
1330	struct snd_rawmidi_runtime *runtime;
 
 
1331
1332	guard(spinlock_irqsave)(&substream->lock);
1333	runtime = substream->runtime;
1334	if (!substream->opened || !runtime || !runtime->buffer) {
1335		rmidi_dbg(substream->rmidi,
1336			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1337		return 1;
 
 
1338	}
1339	return (runtime->avail >= runtime->buffer_size);
 
1340}
1341EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1342
1343/*
1344 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1345 * @substream: the rawmidi substream
1346 * @buffer: the buffer pointer
1347 * @count: data size to transfer
1348 *
1349 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1350 */
1351static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1352				       unsigned char *buffer, int count)
1353{
1354	int result, count1;
1355	struct snd_rawmidi_runtime *runtime = substream->runtime;
1356
1357	if (runtime->buffer == NULL) {
1358		rmidi_dbg(substream->rmidi,
1359			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1360		return -EINVAL;
1361	}
1362	result = 0;
1363	if (runtime->avail >= runtime->buffer_size) {
1364		/* warning: lowlevel layer MUST trigger down the hardware */
1365		goto __skip;
1366	}
1367	if (count == 1) {	/* special case, faster code */
1368		*buffer = runtime->buffer[runtime->hw_ptr];
1369		result++;
1370	} else {
1371		count1 = runtime->buffer_size - runtime->hw_ptr;
1372		if (count1 > count)
1373			count1 = count;
1374		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1375			count1 = runtime->buffer_size - runtime->avail;
1376		count1 = get_aligned_size(runtime, count1);
1377		if (!count1)
1378			goto __skip;
1379		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1380		count -= count1;
1381		result += count1;
1382		if (count > 0) {
1383			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1384				count = runtime->buffer_size - runtime->avail - count1;
1385			count = get_aligned_size(runtime, count);
1386			if (!count)
1387				goto __skip;
1388			memcpy(buffer + count1, runtime->buffer, count);
1389			result += count;
1390		}
1391	}
1392      __skip:
1393	return result;
1394}
1395
1396/**
1397 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1398 * @substream: the rawmidi substream
1399 * @buffer: the buffer pointer
1400 * @count: data size to transfer
1401 *
1402 * Copies data from the internal output buffer to the given buffer.
1403 *
1404 * Call this in the interrupt handler when the midi output is ready,
1405 * and call snd_rawmidi_transmit_ack() after the transmission is
1406 * finished.
1407 *
1408 * Return: The size of copied data, or a negative error code on failure.
1409 */
1410int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1411			      unsigned char *buffer, int count)
1412{
1413	guard(spinlock_irqsave)(&substream->lock);
 
 
 
1414	if (!substream->opened || !substream->runtime)
1415		return -EBADFD;
1416	return __snd_rawmidi_transmit_peek(substream, buffer, count);
 
 
 
1417}
1418EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1419
1420/*
1421 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1422 * @substream: the rawmidi substream
1423 * @count: the transferred count
1424 *
1425 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1426 */
1427static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1428				      int count)
1429{
1430	struct snd_rawmidi_runtime *runtime = substream->runtime;
1431
1432	if (runtime->buffer == NULL) {
1433		rmidi_dbg(substream->rmidi,
1434			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1435		return -EINVAL;
1436	}
1437	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1438	count = get_aligned_size(runtime, count);
1439	runtime->hw_ptr += count;
1440	runtime->hw_ptr %= runtime->buffer_size;
1441	runtime->avail += count;
1442	substream->bytes += count;
1443	if (count > 0) {
1444		if (runtime->drain || __snd_rawmidi_ready(runtime))
1445			wake_up(&runtime->sleep);
1446	}
1447	return count;
1448}
1449
1450/**
1451 * snd_rawmidi_transmit_ack - acknowledge the transmission
1452 * @substream: the rawmidi substream
1453 * @count: the transferred count
1454 *
1455 * Advances the hardware pointer for the internal output buffer with
1456 * the given size and updates the condition.
1457 * Call after the transmission is finished.
1458 *
1459 * Return: The advanced size if successful, or a negative error code on failure.
1460 */
1461int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1462{
1463	guard(spinlock_irqsave)(&substream->lock);
 
 
 
1464	if (!substream->opened || !substream->runtime)
1465		return -EBADFD;
1466	return __snd_rawmidi_transmit_ack(substream, count);
 
 
 
1467}
1468EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1469
1470/**
1471 * snd_rawmidi_transmit - copy from the buffer to the device
1472 * @substream: the rawmidi substream
1473 * @buffer: the buffer pointer
1474 * @count: the data size to transfer
1475 *
1476 * Copies data from the buffer to the device and advances the pointer.
1477 *
1478 * Return: The copied size if successful, or a negative error code on failure.
1479 */
1480int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1481			 unsigned char *buffer, int count)
1482{
1483	guard(spinlock_irqsave)(&substream->lock);
 
 
 
1484	if (!substream->opened)
1485		return -EBADFD;
1486	count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1487	if (count <= 0)
1488		return count;
1489	return __snd_rawmidi_transmit_ack(substream, count);
 
 
 
 
 
1490}
1491EXPORT_SYMBOL(snd_rawmidi_transmit);
1492
1493/**
1494 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1495 * @substream: rawmidi substream
1496 *
1497 * Return: the number of discarded bytes
1498 */
1499int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1500{
1501	struct snd_rawmidi_runtime *runtime;
 
1502	int count = 0;
1503
1504	guard(spinlock_irqsave)(&substream->lock);
1505	runtime = substream->runtime;
1506	if (substream->opened && runtime &&
1507	    runtime->avail < runtime->buffer_size) {
1508		count = runtime->buffer_size - runtime->avail;
1509		__snd_rawmidi_transmit_ack(substream, count);
1510	}
 
1511	return count;
1512}
1513EXPORT_SYMBOL(snd_rawmidi_proceed);
1514
1515static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1516				      const unsigned char __user *userbuf,
1517				      const unsigned char *kernelbuf,
1518				      long count)
1519{
1520	unsigned long flags;
1521	long count1, result;
1522	struct snd_rawmidi_runtime *runtime = substream->runtime;
1523	unsigned long appl_ptr;
1524
1525	if (!kernelbuf && !userbuf)
1526		return -EINVAL;
1527	if (snd_BUG_ON(!runtime->buffer))
1528		return -EINVAL;
1529
1530	result = 0;
1531	spin_lock_irqsave(&substream->lock, flags);
1532	if (substream->append) {
1533		if ((long)runtime->avail < count) {
1534			spin_unlock_irqrestore(&substream->lock, flags);
1535			return -EAGAIN;
1536		}
1537	}
1538	snd_rawmidi_buffer_ref(runtime);
1539	while (count > 0 && runtime->avail > 0) {
1540		count1 = runtime->buffer_size - runtime->appl_ptr;
1541		if (count1 > count)
1542			count1 = count;
1543		if (count1 > (long)runtime->avail)
1544			count1 = runtime->avail;
1545
1546		/* update runtime->appl_ptr before unlocking for userbuf */
1547		appl_ptr = runtime->appl_ptr;
1548		runtime->appl_ptr += count1;
1549		runtime->appl_ptr %= runtime->buffer_size;
1550		runtime->avail -= count1;
1551
1552		if (kernelbuf)
1553			memcpy(runtime->buffer + appl_ptr,
1554			       kernelbuf + result, count1);
1555		else if (userbuf) {
1556			spin_unlock_irqrestore(&substream->lock, flags);
1557			if (copy_from_user(runtime->buffer + appl_ptr,
1558					   userbuf + result, count1)) {
1559				spin_lock_irqsave(&substream->lock, flags);
1560				result = result > 0 ? result : -EFAULT;
1561				goto __end;
1562			}
1563			spin_lock_irqsave(&substream->lock, flags);
1564		}
1565		result += count1;
1566		count -= count1;
1567	}
1568      __end:
1569	count1 = runtime->avail < runtime->buffer_size;
1570	snd_rawmidi_buffer_unref(runtime);
1571	spin_unlock_irqrestore(&substream->lock, flags);
1572	if (count1)
1573		snd_rawmidi_output_trigger(substream, 1);
1574	return result;
1575}
1576
1577long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1578			      const unsigned char *buf, long count)
1579{
1580	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1581}
1582EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1583
1584static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1585				 size_t count, loff_t *offset)
1586{
1587	long result, timeout;
1588	int count1;
1589	struct snd_rawmidi_file *rfile;
1590	struct snd_rawmidi_runtime *runtime;
1591	struct snd_rawmidi_substream *substream;
1592
1593	rfile = file->private_data;
1594	substream = rfile->output;
1595	runtime = substream->runtime;
1596	/* we cannot put an atomic message to our buffer */
1597	if (substream->append && count > runtime->buffer_size)
1598		return -EIO;
1599	result = 0;
1600	while (count > 0) {
1601		spin_lock_irq(&substream->lock);
1602		while (!snd_rawmidi_ready_append(substream, count)) {
1603			wait_queue_entry_t wait;
1604
1605			if (file->f_flags & O_NONBLOCK) {
1606				spin_unlock_irq(&substream->lock);
1607				return result > 0 ? result : -EAGAIN;
1608			}
1609			init_waitqueue_entry(&wait, current);
1610			add_wait_queue(&runtime->sleep, &wait);
1611			set_current_state(TASK_INTERRUPTIBLE);
1612			spin_unlock_irq(&substream->lock);
1613			timeout = schedule_timeout(30 * HZ);
1614			remove_wait_queue(&runtime->sleep, &wait);
1615			if (rfile->rmidi->card->shutdown)
1616				return -ENODEV;
1617			if (signal_pending(current))
1618				return result > 0 ? result : -ERESTARTSYS;
1619			spin_lock_irq(&substream->lock);
1620			if (!runtime->avail && !timeout) {
1621				spin_unlock_irq(&substream->lock);
1622				return result > 0 ? result : -EIO;
1623			}
1624		}
1625		spin_unlock_irq(&substream->lock);
1626		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1627		if (count1 < 0)
1628			return result > 0 ? result : count1;
1629		result += count1;
1630		buf += count1;
1631		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1632			break;
1633		count -= count1;
1634	}
1635	if (file->f_flags & O_DSYNC) {
1636		spin_lock_irq(&substream->lock);
1637		while (runtime->avail != runtime->buffer_size) {
1638			wait_queue_entry_t wait;
1639			unsigned int last_avail = runtime->avail;
1640
1641			init_waitqueue_entry(&wait, current);
1642			add_wait_queue(&runtime->sleep, &wait);
1643			set_current_state(TASK_INTERRUPTIBLE);
1644			spin_unlock_irq(&substream->lock);
1645			timeout = schedule_timeout(30 * HZ);
1646			remove_wait_queue(&runtime->sleep, &wait);
1647			if (signal_pending(current))
1648				return result > 0 ? result : -ERESTARTSYS;
1649			if (runtime->avail == last_avail && !timeout)
1650				return result > 0 ? result : -EIO;
1651			spin_lock_irq(&substream->lock);
1652		}
1653		spin_unlock_irq(&substream->lock);
1654	}
1655	return result;
1656}
1657
1658static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1659{
1660	struct snd_rawmidi_file *rfile;
1661	struct snd_rawmidi_runtime *runtime;
1662	__poll_t mask;
1663
1664	rfile = file->private_data;
1665	if (rfile->input != NULL) {
1666		runtime = rfile->input->runtime;
1667		snd_rawmidi_input_trigger(rfile->input, 1);
1668		poll_wait(file, &runtime->sleep, wait);
1669	}
1670	if (rfile->output != NULL) {
1671		runtime = rfile->output->runtime;
1672		poll_wait(file, &runtime->sleep, wait);
1673	}
1674	mask = 0;
1675	if (rfile->input != NULL) {
1676		if (snd_rawmidi_ready(rfile->input))
1677			mask |= EPOLLIN | EPOLLRDNORM;
1678	}
1679	if (rfile->output != NULL) {
1680		if (snd_rawmidi_ready(rfile->output))
1681			mask |= EPOLLOUT | EPOLLWRNORM;
1682	}
1683	return mask;
1684}
1685
1686/*
1687 */
1688#ifdef CONFIG_COMPAT
1689#include "rawmidi_compat.c"
1690#else
1691#define snd_rawmidi_ioctl_compat	NULL
1692#endif
1693
1694/*
1695 */
1696
1697static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1698				       struct snd_info_buffer *buffer)
1699{
1700	struct snd_rawmidi *rmidi;
1701	struct snd_rawmidi_substream *substream;
1702	struct snd_rawmidi_runtime *runtime;
1703	unsigned long buffer_size, avail, xruns;
1704	unsigned int clock_type;
1705	static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1706
1707	rmidi = entry->private_data;
1708	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1709	if (IS_ENABLED(CONFIG_SND_UMP))
1710		snd_iprintf(buffer, "Type: %s\n",
1711			    rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
1712	if (rmidi->ops && rmidi->ops->proc_read)
1713		rmidi->ops->proc_read(entry, buffer);
1714	guard(mutex)(&rmidi->open_mutex);
1715	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1716		list_for_each_entry(substream,
1717				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1718				    list) {
1719			snd_iprintf(buffer,
1720				    "Output %d\n"
1721				    "  Tx bytes     : %lu\n",
1722				    substream->number,
1723				    (unsigned long) substream->bytes);
1724			if (substream->opened) {
1725				snd_iprintf(buffer,
1726				    "  Owner PID    : %d\n",
1727				    pid_vnr(substream->pid));
1728				runtime = substream->runtime;
1729				scoped_guard(spinlock_irq, &substream->lock) {
1730					buffer_size = runtime->buffer_size;
1731					avail = runtime->avail;
1732				}
1733				snd_iprintf(buffer,
1734				    "  Mode         : %s\n"
1735				    "  Buffer size  : %lu\n"
1736				    "  Avail        : %lu\n",
1737				    runtime->oss ? "OSS compatible" : "native",
1738				    buffer_size, avail);
1739			}
1740		}
1741	}
1742	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1743		list_for_each_entry(substream,
1744				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1745				    list) {
1746			snd_iprintf(buffer,
1747				    "Input %d\n"
1748				    "  Rx bytes     : %lu\n",
1749				    substream->number,
1750				    (unsigned long) substream->bytes);
1751			if (substream->opened) {
1752				snd_iprintf(buffer,
1753					    "  Owner PID    : %d\n",
1754					    pid_vnr(substream->pid));
1755				runtime = substream->runtime;
1756				scoped_guard(spinlock_irq, &substream->lock) {
1757					buffer_size = runtime->buffer_size;
1758					avail = runtime->avail;
1759					xruns = runtime->xruns;
1760				}
1761				snd_iprintf(buffer,
1762					    "  Buffer size  : %lu\n"
1763					    "  Avail        : %lu\n"
1764					    "  Overruns     : %lu\n",
1765					    buffer_size, avail, xruns);
1766				if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1767					clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1768					if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1769						snd_iprintf(buffer,
1770							    "  Framing      : tstamp\n"
1771							    "  Clock type   : %s\n",
1772							    clock_names[clock_type]);
1773				}
1774			}
1775		}
1776	}
 
1777}
1778
1779/*
1780 *  Register functions
1781 */
1782
1783static const struct file_operations snd_rawmidi_f_ops = {
1784	.owner =	THIS_MODULE,
1785	.read =		snd_rawmidi_read,
1786	.write =	snd_rawmidi_write,
1787	.open =		snd_rawmidi_open,
1788	.release =	snd_rawmidi_release,
 
1789	.poll =		snd_rawmidi_poll,
1790	.unlocked_ioctl =	snd_rawmidi_ioctl,
1791	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1792};
1793
1794static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1795					struct snd_rawmidi_str *stream,
1796					int direction,
1797					int count)
1798{
1799	struct snd_rawmidi_substream *substream;
1800	int idx;
1801
1802	for (idx = 0; idx < count; idx++) {
1803		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1804		if (!substream)
1805			return -ENOMEM;
1806		substream->stream = direction;
1807		substream->number = idx;
1808		substream->rmidi = rmidi;
1809		substream->pstr = stream;
1810		spin_lock_init(&substream->lock);
1811		list_add_tail(&substream->list, &stream->substreams);
1812		stream->substream_count++;
1813	}
1814	return 0;
1815}
1816
1817/* used for both rawmidi and ump */
1818int snd_rawmidi_init(struct snd_rawmidi *rmidi,
1819		     struct snd_card *card, char *id, int device,
1820		     int output_count, int input_count,
1821		     unsigned int info_flags)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1822{
 
1823	int err;
1824	static const struct snd_device_ops ops = {
1825		.dev_free = snd_rawmidi_dev_free,
1826		.dev_register = snd_rawmidi_dev_register,
1827		.dev_disconnect = snd_rawmidi_dev_disconnect,
1828	};
1829
 
 
 
 
 
 
 
1830	rmidi->card = card;
1831	rmidi->device = device;
1832	mutex_init(&rmidi->open_mutex);
1833	init_waitqueue_head(&rmidi->open_wait);
1834	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1835	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1836	rmidi->info_flags = info_flags;
1837
1838	if (id != NULL)
1839		strscpy(rmidi->id, id, sizeof(rmidi->id));
1840
1841	err = snd_device_alloc(&rmidi->dev, card);
1842	if (err < 0)
1843		return err;
1844	if (rawmidi_is_ump(rmidi))
1845		dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);
1846	else
1847		dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);
1848
1849	err = snd_rawmidi_alloc_substreams(rmidi,
1850					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1851					   SNDRV_RAWMIDI_STREAM_INPUT,
1852					   input_count);
1853	if (err < 0)
1854		return err;
1855	err = snd_rawmidi_alloc_substreams(rmidi,
1856					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1857					   SNDRV_RAWMIDI_STREAM_OUTPUT,
1858					   output_count);
1859	if (err < 0)
1860		return err;
1861	err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1862	if (err < 0)
1863		return err;
1864	return 0;
1865}
1866EXPORT_SYMBOL_GPL(snd_rawmidi_init);
1867
1868/**
1869 * snd_rawmidi_new - create a rawmidi instance
1870 * @card: the card instance
1871 * @id: the id string
1872 * @device: the device index
1873 * @output_count: the number of output streams
1874 * @input_count: the number of input streams
1875 * @rrawmidi: the pointer to store the new rawmidi instance
1876 *
1877 * Creates a new rawmidi instance.
1878 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1879 *
1880 * Return: Zero if successful, or a negative error code on failure.
1881 */
1882int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1883		    int output_count, int input_count,
1884		    struct snd_rawmidi **rrawmidi)
1885{
1886	struct snd_rawmidi *rmidi;
1887	int err;
1888
1889	if (rrawmidi)
1890		*rrawmidi = NULL;
1891	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1892	if (!rmidi)
1893		return -ENOMEM;
1894	err = snd_rawmidi_init(rmidi, card, id, device,
1895			       output_count, input_count, 0);
1896	if (err < 0) {
1897		snd_rawmidi_free(rmidi);
1898		return err;
1899	}
1900	if (rrawmidi)
1901		*rrawmidi = rmidi;
1902	return 0;
 
 
 
 
1903}
1904EXPORT_SYMBOL(snd_rawmidi_new);
1905
1906static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1907{
1908	struct snd_rawmidi_substream *substream;
1909
1910	while (!list_empty(&stream->substreams)) {
1911		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1912		list_del(&substream->list);
1913		kfree(substream);
1914	}
1915}
1916
1917/* called from ump.c, too */
1918int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1919{
1920	if (!rmidi)
1921		return 0;
1922
1923	snd_info_free_entry(rmidi->proc_entry);
1924	rmidi->proc_entry = NULL;
1925	if (rmidi->ops && rmidi->ops->dev_unregister)
1926		rmidi->ops->dev_unregister(rmidi);
1927
1928	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1929	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1930	if (rmidi->private_free)
1931		rmidi->private_free(rmidi);
1932	put_device(rmidi->dev);
1933	kfree(rmidi);
1934	return 0;
1935}
1936EXPORT_SYMBOL_GPL(snd_rawmidi_free);
1937
1938static int snd_rawmidi_dev_free(struct snd_device *device)
1939{
1940	struct snd_rawmidi *rmidi = device->device_data;
1941
1942	return snd_rawmidi_free(rmidi);
1943}
1944
1945#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1946static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1947{
1948	struct snd_rawmidi *rmidi = device->private_data;
1949
1950	rmidi->seq_dev = NULL;
1951}
1952#endif
1953
1954static int snd_rawmidi_dev_register(struct snd_device *device)
1955{
1956	int err;
1957	struct snd_info_entry *entry;
1958	char name[16];
1959	struct snd_rawmidi *rmidi = device->device_data;
1960
1961	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1962		return -ENOMEM;
1963	err = 0;
1964	scoped_guard(mutex, &register_mutex) {
1965		if (snd_rawmidi_search(rmidi->card, rmidi->device))
1966			err = -EBUSY;
1967		else
1968			list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1969	}
1970	if (err < 0)
1971		return err;
1972
1973	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1974				  rmidi->card, rmidi->device,
1975				  &snd_rawmidi_f_ops, rmidi, rmidi->dev);
1976	if (err < 0) {
1977		rmidi_err(rmidi, "unable to register\n");
1978		goto error;
1979	}
1980	if (rmidi->ops && rmidi->ops->dev_register) {
1981		err = rmidi->ops->dev_register(rmidi);
1982		if (err < 0)
1983			goto error_unregister;
1984	}
1985#ifdef CONFIG_SND_OSSEMUL
1986	rmidi->ossreg = 0;
1987	if (!rawmidi_is_ump(rmidi) &&
1988	    (int)rmidi->device == midi_map[rmidi->card->number]) {
1989		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1990					    rmidi->card, 0, &snd_rawmidi_f_ops,
1991					    rmidi) < 0) {
1992			rmidi_err(rmidi,
1993				  "unable to register OSS rawmidi device %i:%i\n",
1994				  rmidi->card->number, 0);
1995		} else {
1996			rmidi->ossreg++;
1997#ifdef SNDRV_OSS_INFO_DEV_MIDI
1998			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1999#endif
2000		}
2001	}
2002	if (!rawmidi_is_ump(rmidi) &&
2003	    (int)rmidi->device == amidi_map[rmidi->card->number]) {
2004		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2005					    rmidi->card, 1, &snd_rawmidi_f_ops,
2006					    rmidi) < 0) {
2007			rmidi_err(rmidi,
2008				  "unable to register OSS rawmidi device %i:%i\n",
2009				  rmidi->card->number, 1);
2010		} else {
2011			rmidi->ossreg++;
2012		}
2013	}
2014#endif /* CONFIG_SND_OSSEMUL */
2015	sprintf(name, "midi%d", rmidi->device);
2016	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
2017	if (entry) {
2018		entry->private_data = rmidi;
2019		entry->c.text.read = snd_rawmidi_proc_info_read;
2020		if (snd_info_register(entry) < 0) {
2021			snd_info_free_entry(entry);
2022			entry = NULL;
2023		}
2024	}
2025	rmidi->proc_entry = entry;
2026#if IS_ENABLED(CONFIG_SND_SEQUENCER)
2027	/* no own registration mechanism? */
2028	if (!rmidi->ops || !rmidi->ops->dev_register) {
2029		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2030			rmidi->seq_dev->private_data = rmidi;
2031			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2032			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2033			snd_device_register(rmidi->card, rmidi->seq_dev);
2034		}
2035	}
2036#endif
2037	return 0;
2038
2039 error_unregister:
2040	snd_unregister_device(rmidi->dev);
2041 error:
2042	scoped_guard(mutex, &register_mutex)
2043		list_del(&rmidi->list);
 
2044	return err;
2045}
2046
2047static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2048{
2049	struct snd_rawmidi *rmidi = device->device_data;
2050	int dir;
2051
2052	guard(mutex)(&register_mutex);
2053	guard(mutex)(&rmidi->open_mutex);
2054	wake_up(&rmidi->open_wait);
2055	list_del_init(&rmidi->list);
2056	for (dir = 0; dir < 2; dir++) {
2057		struct snd_rawmidi_substream *s;
2058
2059		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2060			if (s->runtime)
2061				wake_up(&s->runtime->sleep);
2062		}
2063	}
2064
2065#ifdef CONFIG_SND_OSSEMUL
2066	if (rmidi->ossreg) {
2067		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2068			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2069#ifdef SNDRV_OSS_INFO_DEV_MIDI
2070			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2071#endif
2072		}
2073		if ((int)rmidi->device == amidi_map[rmidi->card->number])
2074			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2075		rmidi->ossreg = 0;
2076	}
2077#endif /* CONFIG_SND_OSSEMUL */
2078	snd_unregister_device(rmidi->dev);
 
 
2079	return 0;
2080}
2081
2082/**
2083 * snd_rawmidi_set_ops - set the rawmidi operators
2084 * @rmidi: the rawmidi instance
2085 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2086 * @ops: the operator table
2087 *
2088 * Sets the rawmidi operators for the given stream direction.
2089 */
2090void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2091			 const struct snd_rawmidi_ops *ops)
2092{
2093	struct snd_rawmidi_substream *substream;
2094
2095	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2096		substream->ops = ops;
2097}
2098EXPORT_SYMBOL(snd_rawmidi_set_ops);
2099
2100/*
2101 *  ENTRY functions
2102 */
2103
2104static int __init alsa_rawmidi_init(void)
2105{
2106
2107	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2108	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2109#ifdef CONFIG_SND_OSSEMUL
2110	{ int i;
2111	/* check device map table */
2112	for (i = 0; i < SNDRV_CARDS; i++) {
2113		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2114			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2115			       i, midi_map[i]);
2116			midi_map[i] = 0;
2117		}
2118		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2119			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2120			       i, amidi_map[i]);
2121			amidi_map[i] = 1;
2122		}
2123	}
2124	}
2125#endif /* CONFIG_SND_OSSEMUL */
2126	return 0;
2127}
2128
2129static void __exit alsa_rawmidi_exit(void)
2130{
2131	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2132	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2133}
2134
2135module_init(alsa_rawmidi_init)
2136module_exit(alsa_rawmidi_exit)