1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Abstract layer for MIDI v1.0 stream
   4 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   5 */
   6
   7#include <sound/core.h>
   8#include <linux/major.h>
   9#include <linux/init.h>
  10#include <linux/sched/signal.h>
  11#include <linux/slab.h>
  12#include <linux/time.h>
  13#include <linux/wait.h>
  14#include <linux/mutex.h>
  15#include <linux/module.h>
  16#include <linux/delay.h>
  17#include <linux/mm.h>
  18#include <linux/nospec.h>
  19#include <sound/rawmidi.h>
  20#include <sound/info.h>
  21#include <sound/control.h>
  22#include <sound/minors.h>
  23#include <sound/initval.h>
  24
  25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  26MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  27MODULE_LICENSE("GPL");
  28
  29#ifdef CONFIG_SND_OSSEMUL
  30static int midi_map[SNDRV_CARDS];
  31static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  32module_param_array(midi_map, int, NULL, 0444);
  33MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  34module_param_array(amidi_map, int, NULL, 0444);
  35MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  36#endif /* CONFIG_SND_OSSEMUL */
  37
  38static int snd_rawmidi_free(struct snd_rawmidi *rmidi);
  39static int snd_rawmidi_dev_free(struct snd_device *device);
  40static int snd_rawmidi_dev_register(struct snd_device *device);
  41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  42
  43static LIST_HEAD(snd_rawmidi_devices);
  44static DEFINE_MUTEX(register_mutex);
  45
  46#define rmidi_err(rmidi, fmt, args...) \
  47	dev_err(&(rmidi)->dev, fmt, ##args)
  48#define rmidi_warn(rmidi, fmt, args...) \
  49	dev_warn(&(rmidi)->dev, fmt, ##args)
  50#define rmidi_dbg(rmidi, fmt, args...) \
  51	dev_dbg(&(rmidi)->dev, fmt, ##args)
  52
  53struct snd_rawmidi_status32 {
  54	s32 stream;
  55	s32 tstamp_sec;			/* Timestamp */
  56	s32 tstamp_nsec;
  57	u32 avail;			/* available bytes */
  58	u32 xruns;			/* count of overruns since last status (in bytes) */
  59	unsigned char reserved[16];	/* reserved for future use */
  60};
  61
  62#define SNDRV_RAWMIDI_IOCTL_STATUS32	_IOWR('W', 0x20, struct snd_rawmidi_status32)
  63
  64struct snd_rawmidi_status64 {
  65	int stream;
  66	u8 rsvd[4];			/* alignment */
  67	s64 tstamp_sec;			/* Timestamp */
  68	s64 tstamp_nsec;
  69	size_t avail;			/* available bytes */
  70	size_t xruns;			/* count of overruns since last status (in bytes) */
  71	unsigned char reserved[16];	/* reserved for future use */
  72};
  73
  74#define SNDRV_RAWMIDI_IOCTL_STATUS64	_IOWR('W', 0x20, struct snd_rawmidi_status64)
  75
  76static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  77{
  78	struct snd_rawmidi *rawmidi;
  79
  80	list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  81		if (rawmidi->card == card && rawmidi->device == device)
  82			return rawmidi;
  83	return NULL;
  84}
  85
  86static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  87{
  88	switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  89	case FMODE_WRITE:
  90		return SNDRV_RAWMIDI_LFLG_OUTPUT;
  91	case FMODE_READ:
  92		return SNDRV_RAWMIDI_LFLG_INPUT;
  93	default:
  94		return SNDRV_RAWMIDI_LFLG_OPEN;
  95	}
  96}
  97
  98static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
  99{
 
 100	return runtime->avail >= runtime->avail_min;
 101}
 102
 103static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
 104{
 105	unsigned long flags;
 106	bool ready;
 107
 108	spin_lock_irqsave(&substream->lock, flags);
 109	ready = __snd_rawmidi_ready(substream->runtime);
 110	spin_unlock_irqrestore(&substream->lock, flags);
 111	return ready;
 112}
 113
 114static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 115					   size_t count)
 116{
 117	struct snd_rawmidi_runtime *runtime = substream->runtime;
 118
 119	return runtime->avail >= runtime->avail_min &&
 120	       (!substream->append || runtime->avail >= count);
 121}
 122
 123static void snd_rawmidi_input_event_work(struct work_struct *work)
 124{
 125	struct snd_rawmidi_runtime *runtime =
 126		container_of(work, struct snd_rawmidi_runtime, event_work);
 127
 128	if (runtime->event)
 129		runtime->event(runtime->substream);
 130}
 131
 132/* buffer refcount management: call with substream->lock held */
 133static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 134{
 135	runtime->buffer_ref++;
 136}
 137
 138static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 139{
 140	runtime->buffer_ref--;
 141}
 142
 143static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
 144{
 145	int loop = HZ;
 146
 147	spin_lock_irq(&substream->lock);
 148	while (substream->runtime->buffer_ref) {
 149		spin_unlock_irq(&substream->lock);
 150		if (!--loop) {
 151			rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
 152			return;
 153		}
 154		schedule_timeout_uninterruptible(1);
 155		spin_lock_irq(&substream->lock);
 156	}
 157	spin_unlock_irq(&substream->lock);
 158}
 159
 160static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 161{
 162	struct snd_rawmidi_runtime *runtime;
 163
 164	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 165	if (!runtime)
 166		return -ENOMEM;
 167	runtime->substream = substream;
 
 168	init_waitqueue_head(&runtime->sleep);
 169	INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 170	runtime->event = NULL;
 171	runtime->buffer_size = PAGE_SIZE;
 172	runtime->avail_min = 1;
 173	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 174		runtime->avail = 0;
 175	else
 176		runtime->avail = runtime->buffer_size;
 177	runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 178	if (!runtime->buffer) {
 179		kfree(runtime);
 180		return -ENOMEM;
 181	}
 182	runtime->appl_ptr = runtime->hw_ptr = 0;
 183	substream->runtime = runtime;
 184	return 0;
 185}
 186
 187static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 188{
 189	struct snd_rawmidi_runtime *runtime = substream->runtime;
 190
 191	kvfree(runtime->buffer);
 192	kfree(runtime);
 193	substream->runtime = NULL;
 194	return 0;
 195}
 196
 197static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 198{
 199	if (!substream->opened)
 200		return;
 201	substream->ops->trigger(substream, up);
 202}
 203
 204static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 205{
 206	if (!substream->opened)
 207		return;
 208	substream->ops->trigger(substream, up);
 209	if (!up)
 210		cancel_work_sync(&substream->runtime->event_work);
 211}
 212
 213static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 214				 bool is_input)
 215{
 216	runtime->drain = 0;
 217	runtime->appl_ptr = runtime->hw_ptr = 0;
 218	runtime->avail = is_input ? 0 : runtime->buffer_size;
 219}
 220
 221static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
 222			       bool is_input)
 223{
 224	unsigned long flags;
 
 225
 226	spin_lock_irqsave(&substream->lock, flags);
 227	if (substream->opened && substream->runtime)
 228		__reset_runtime_ptrs(substream->runtime, is_input);
 229	spin_unlock_irqrestore(&substream->lock, flags);
 230}
 231
 232int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 233{
 234	snd_rawmidi_output_trigger(substream, 0);
 235	reset_runtime_ptrs(substream, false);
 
 
 
 
 236	return 0;
 237}
 238EXPORT_SYMBOL(snd_rawmidi_drop_output);
 239
 240int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 241{
 242	int err = 0;
 243	long timeout;
 244	struct snd_rawmidi_runtime *runtime;
 245
 246	spin_lock_irq(&substream->lock);
 247	runtime = substream->runtime;
 248	if (!substream->opened || !runtime || !runtime->buffer) {
 249		err = -EINVAL;
 250	} else {
 251		snd_rawmidi_buffer_ref(runtime);
 252		runtime->drain = 1;
 253	}
 254	spin_unlock_irq(&substream->lock);
 255	if (err < 0)
 256		return err;
 257
 
 
 258	timeout = wait_event_interruptible_timeout(runtime->sleep,
 259				(runtime->avail >= runtime->buffer_size),
 260				10*HZ);
 261
 262	spin_lock_irq(&substream->lock);
 263	if (signal_pending(current))
 264		err = -ERESTARTSYS;
 265	if (runtime->avail < runtime->buffer_size && !timeout) {
 266		rmidi_warn(substream->rmidi,
 267			   "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 268			   (long)runtime->avail, (long)runtime->buffer_size);
 269		err = -EIO;
 270	}
 271	runtime->drain = 0;
 272	spin_unlock_irq(&substream->lock);
 273
 274	if (err != -ERESTARTSYS) {
 275		/* we need wait a while to make sure that Tx FIFOs are empty */
 276		if (substream->ops->drain)
 277			substream->ops->drain(substream);
 278		else
 279			msleep(50);
 280		snd_rawmidi_drop_output(substream);
 281	}
 282
 283	spin_lock_irq(&substream->lock);
 284	snd_rawmidi_buffer_unref(runtime);
 285	spin_unlock_irq(&substream->lock);
 286
 287	return err;
 288}
 289EXPORT_SYMBOL(snd_rawmidi_drain_output);
 290
 291int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 292{
 
 
 
 293	snd_rawmidi_input_trigger(substream, 0);
 294	reset_runtime_ptrs(substream, true);
 
 
 
 
 295	return 0;
 296}
 297EXPORT_SYMBOL(snd_rawmidi_drain_input);
 298
 299/* look for an available substream for the given stream direction;
 300 * if a specific subdevice is given, try to assign it
 301 */
 302static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 303			    int stream, int mode,
 304			    struct snd_rawmidi_substream **sub_ret)
 305{
 306	struct snd_rawmidi_substream *substream;
 307	struct snd_rawmidi_str *s = &rmidi->streams[stream];
 308	static const unsigned int info_flags[2] = {
 309		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 310		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 311	};
 312
 313	if (!(rmidi->info_flags & info_flags[stream]))
 314		return -ENXIO;
 315	if (subdevice >= 0 && subdevice >= s->substream_count)
 316		return -ENODEV;
 317
 318	list_for_each_entry(substream, &s->substreams, list) {
 319		if (substream->opened) {
 320			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 321			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 322			    !substream->append)
 323				continue;
 324		}
 325		if (subdevice < 0 || subdevice == substream->number) {
 326			*sub_ret = substream;
 327			return 0;
 328		}
 329	}
 330	return -EAGAIN;
 331}
 332
 333/* open and do ref-counting for the given substream */
 334static int open_substream(struct snd_rawmidi *rmidi,
 335			  struct snd_rawmidi_substream *substream,
 336			  int mode)
 337{
 338	int err;
 339
 340	if (substream->use_count == 0) {
 341		err = snd_rawmidi_runtime_create(substream);
 342		if (err < 0)
 343			return err;
 344		err = substream->ops->open(substream);
 345		if (err < 0) {
 346			snd_rawmidi_runtime_free(substream);
 347			return err;
 348		}
 349		spin_lock_irq(&substream->lock);
 350		substream->opened = 1;
 351		substream->active_sensing = 0;
 352		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 353			substream->append = 1;
 354		substream->pid = get_pid(task_pid(current));
 355		rmidi->streams[substream->stream].substream_opened++;
 356		spin_unlock_irq(&substream->lock);
 357	}
 358	substream->use_count++;
 359	return 0;
 360}
 361
 362static void close_substream(struct snd_rawmidi *rmidi,
 363			    struct snd_rawmidi_substream *substream,
 364			    int cleanup);
 365
 366static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 367			     struct snd_rawmidi_file *rfile)
 368{
 369	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 370	int err;
 371
 372	rfile->input = rfile->output = NULL;
 373	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 374		err = assign_substream(rmidi, subdevice,
 375				       SNDRV_RAWMIDI_STREAM_INPUT,
 376				       mode, &sinput);
 377		if (err < 0)
 378			return err;
 379	}
 380	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 381		err = assign_substream(rmidi, subdevice,
 382				       SNDRV_RAWMIDI_STREAM_OUTPUT,
 383				       mode, &soutput);
 384		if (err < 0)
 385			return err;
 386	}
 387
 388	if (sinput) {
 389		err = open_substream(rmidi, sinput, mode);
 390		if (err < 0)
 391			return err;
 392	}
 393	if (soutput) {
 394		err = open_substream(rmidi, soutput, mode);
 395		if (err < 0) {
 396			if (sinput)
 397				close_substream(rmidi, sinput, 0);
 398			return err;
 399		}
 400	}
 401
 402	rfile->rmidi = rmidi;
 403	rfile->input = sinput;
 404	rfile->output = soutput;
 405	return 0;
 406}
 407
 408/* called from sound/core/seq/seq_midi.c */
 409int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 410			    int mode, struct snd_rawmidi_file *rfile)
 411{
 412	struct snd_rawmidi *rmidi;
 413	int err = 0;
 414
 415	if (snd_BUG_ON(!rfile))
 416		return -EINVAL;
 417
 418	mutex_lock(&register_mutex);
 419	rmidi = snd_rawmidi_search(card, device);
 420	if (!rmidi)
 421		err = -ENODEV;
 422	else if (!try_module_get(rmidi->card->module))
 423		err = -ENXIO;
 
 
 
 
 424	mutex_unlock(&register_mutex);
 425	if (err < 0)
 426		return err;
 427
 428	mutex_lock(&rmidi->open_mutex);
 429	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 430	mutex_unlock(&rmidi->open_mutex);
 431	if (err < 0)
 432		module_put(rmidi->card->module);
 433	return err;
 434}
 435EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 436
 437static int snd_rawmidi_open(struct inode *inode, struct file *file)
 438{
 439	int maj = imajor(inode);
 440	struct snd_card *card;
 441	int subdevice;
 442	unsigned short fflags;
 443	int err;
 444	struct snd_rawmidi *rmidi;
 445	struct snd_rawmidi_file *rawmidi_file = NULL;
 446	wait_queue_entry_t wait;
 447
 448	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 449		return -EINVAL;		/* invalid combination */
 450
 451	err = stream_open(inode, file);
 452	if (err < 0)
 453		return err;
 454
 455	if (maj == snd_major) {
 456		rmidi = snd_lookup_minor_data(iminor(inode),
 457					      SNDRV_DEVICE_TYPE_RAWMIDI);
 458#ifdef CONFIG_SND_OSSEMUL
 459	} else if (maj == SOUND_MAJOR) {
 460		rmidi = snd_lookup_oss_minor_data(iminor(inode),
 461						  SNDRV_OSS_DEVICE_TYPE_MIDI);
 462#endif
 463	} else
 464		return -ENXIO;
 465
 466	if (rmidi == NULL)
 467		return -ENODEV;
 468
 469	if (!try_module_get(rmidi->card->module)) {
 470		snd_card_unref(rmidi->card);
 471		return -ENXIO;
 472	}
 473
 474	mutex_lock(&rmidi->open_mutex);
 475	card = rmidi->card;
 476	err = snd_card_file_add(card, file);
 477	if (err < 0)
 478		goto __error_card;
 479	fflags = snd_rawmidi_file_flags(file);
 480	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 481		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 482	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 483	if (rawmidi_file == NULL) {
 484		err = -ENOMEM;
 485		goto __error;
 486	}
 487	rawmidi_file->user_pversion = 0;
 488	init_waitqueue_entry(&wait, current);
 489	add_wait_queue(&rmidi->open_wait, &wait);
 490	while (1) {
 491		subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 492		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 493		if (err >= 0)
 494			break;
 495		if (err == -EAGAIN) {
 496			if (file->f_flags & O_NONBLOCK) {
 497				err = -EBUSY;
 498				break;
 499			}
 500		} else
 501			break;
 502		set_current_state(TASK_INTERRUPTIBLE);
 503		mutex_unlock(&rmidi->open_mutex);
 504		schedule();
 505		mutex_lock(&rmidi->open_mutex);
 506		if (rmidi->card->shutdown) {
 507			err = -ENODEV;
 508			break;
 509		}
 510		if (signal_pending(current)) {
 511			err = -ERESTARTSYS;
 512			break;
 513		}
 514	}
 515	remove_wait_queue(&rmidi->open_wait, &wait);
 516	if (err < 0) {
 517		kfree(rawmidi_file);
 518		goto __error;
 519	}
 520#ifdef CONFIG_SND_OSSEMUL
 521	if (rawmidi_file->input && rawmidi_file->input->runtime)
 522		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 523	if (rawmidi_file->output && rawmidi_file->output->runtime)
 524		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 525#endif
 526	file->private_data = rawmidi_file;
 527	mutex_unlock(&rmidi->open_mutex);
 528	snd_card_unref(rmidi->card);
 529	return 0;
 530
 531 __error:
 532	snd_card_file_remove(card, file);
 533 __error_card:
 534	mutex_unlock(&rmidi->open_mutex);
 535	module_put(rmidi->card->module);
 536	snd_card_unref(rmidi->card);
 537	return err;
 538}
 539
 540static void close_substream(struct snd_rawmidi *rmidi,
 541			    struct snd_rawmidi_substream *substream,
 542			    int cleanup)
 543{
 544	if (--substream->use_count)
 545		return;
 546
 547	if (cleanup) {
 548		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 549			snd_rawmidi_input_trigger(substream, 0);
 550		else {
 551			if (substream->active_sensing) {
 552				unsigned char buf = 0xfe;
 553				/* sending single active sensing message
 554				 * to shut the device up
 555				 */
 556				snd_rawmidi_kernel_write(substream, &buf, 1);
 557			}
 558			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 559				snd_rawmidi_output_trigger(substream, 0);
 560		}
 561		snd_rawmidi_buffer_ref_sync(substream);
 562	}
 563	spin_lock_irq(&substream->lock);
 564	substream->opened = 0;
 565	substream->append = 0;
 566	spin_unlock_irq(&substream->lock);
 567	substream->ops->close(substream);
 568	if (substream->runtime->private_free)
 569		substream->runtime->private_free(substream);
 570	snd_rawmidi_runtime_free(substream);
 
 
 571	put_pid(substream->pid);
 572	substream->pid = NULL;
 573	rmidi->streams[substream->stream].substream_opened--;
 574}
 575
 576static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 577{
 578	struct snd_rawmidi *rmidi;
 579
 580	rmidi = rfile->rmidi;
 581	mutex_lock(&rmidi->open_mutex);
 582	if (rfile->input) {
 583		close_substream(rmidi, rfile->input, 1);
 584		rfile->input = NULL;
 585	}
 586	if (rfile->output) {
 587		close_substream(rmidi, rfile->output, 1);
 588		rfile->output = NULL;
 589	}
 590	rfile->rmidi = NULL;
 591	mutex_unlock(&rmidi->open_mutex);
 592	wake_up(&rmidi->open_wait);
 593}
 594
 595/* called from sound/core/seq/seq_midi.c */
 596int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 597{
 598	struct snd_rawmidi *rmidi;
 599
 600	if (snd_BUG_ON(!rfile))
 601		return -ENXIO;
 602
 603	rmidi = rfile->rmidi;
 604	rawmidi_release_priv(rfile);
 605	module_put(rmidi->card->module);
 606	return 0;
 607}
 608EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 609
 610static int snd_rawmidi_release(struct inode *inode, struct file *file)
 611{
 612	struct snd_rawmidi_file *rfile;
 613	struct snd_rawmidi *rmidi;
 614	struct module *module;
 615
 616	rfile = file->private_data;
 617	rmidi = rfile->rmidi;
 618	rawmidi_release_priv(rfile);
 619	kfree(rfile);
 620	module = rmidi->card->module;
 621	snd_card_file_remove(rmidi->card, file);
 622	module_put(module);
 623	return 0;
 624}
 625
 626static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 627			    struct snd_rawmidi_info *info)
 628{
 629	struct snd_rawmidi *rmidi;
 630
 631	if (substream == NULL)
 632		return -ENODEV;
 633	rmidi = substream->rmidi;
 634	memset(info, 0, sizeof(*info));
 635	info->card = rmidi->card->number;
 636	info->device = rmidi->device;
 637	info->subdevice = substream->number;
 638	info->stream = substream->stream;
 639	info->flags = rmidi->info_flags;
 640	strcpy(info->id, rmidi->id);
 641	strcpy(info->name, rmidi->name);
 642	strcpy(info->subname, substream->name);
 643	info->subdevices_count = substream->pstr->substream_count;
 644	info->subdevices_avail = (substream->pstr->substream_count -
 645				  substream->pstr->substream_opened);
 646	return 0;
 647}
 648
 649static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 650				 struct snd_rawmidi_info __user *_info)
 651{
 652	struct snd_rawmidi_info info;
 653	int err;
 654
 655	err = snd_rawmidi_info(substream, &info);
 656	if (err < 0)
 657		return err;
 658	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 659		return -EFAULT;
 660	return 0;
 661}
 662
 663static int __snd_rawmidi_info_select(struct snd_card *card,
 664				     struct snd_rawmidi_info *info)
 665{
 666	struct snd_rawmidi *rmidi;
 667	struct snd_rawmidi_str *pstr;
 668	struct snd_rawmidi_substream *substream;
 669
 
 670	rmidi = snd_rawmidi_search(card, info->device);
 
 671	if (!rmidi)
 672		return -ENXIO;
 673	if (info->stream < 0 || info->stream > 1)
 674		return -EINVAL;
 675	info->stream = array_index_nospec(info->stream, 2);
 676	pstr = &rmidi->streams[info->stream];
 677	if (pstr->substream_count == 0)
 678		return -ENOENT;
 679	if (info->subdevice >= pstr->substream_count)
 680		return -ENXIO;
 681	list_for_each_entry(substream, &pstr->substreams, list) {
 682		if ((unsigned int)substream->number == info->subdevice)
 683			return snd_rawmidi_info(substream, info);
 684	}
 685	return -ENXIO;
 686}
 687
 688int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 689{
 690	int ret;
 691
 692	mutex_lock(&register_mutex);
 693	ret = __snd_rawmidi_info_select(card, info);
 694	mutex_unlock(&register_mutex);
 695	return ret;
 696}
 697EXPORT_SYMBOL(snd_rawmidi_info_select);
 698
 699static int snd_rawmidi_info_select_user(struct snd_card *card,
 700					struct snd_rawmidi_info __user *_info)
 701{
 702	int err;
 703	struct snd_rawmidi_info info;
 704
 705	if (get_user(info.device, &_info->device))
 706		return -EFAULT;
 707	if (get_user(info.stream, &_info->stream))
 708		return -EFAULT;
 709	if (get_user(info.subdevice, &_info->subdevice))
 710		return -EFAULT;
 711	err = snd_rawmidi_info_select(card, &info);
 712	if (err < 0)
 713		return err;
 714	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 715		return -EFAULT;
 716	return 0;
 717}
 718
 719static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
 720				 struct snd_rawmidi_params *params,
 721				 bool is_input)
 722{
 
 723	struct snd_rawmidi_runtime *runtime = substream->runtime;
 724	char *newbuf, *oldbuf;
 725	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 726
 727	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 728		return -EINVAL;
 729	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
 730		return -EINVAL;
 731	if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 
 732		return -EINVAL;
 
 733	if (params->buffer_size != runtime->buffer_size) {
 734		newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 
 735		if (!newbuf)
 736			return -ENOMEM;
 737		spin_lock_irq(&substream->lock);
 738		if (runtime->buffer_ref) {
 739			spin_unlock_irq(&substream->lock);
 740			kvfree(newbuf);
 741			return -EBUSY;
 742		}
 743		oldbuf = runtime->buffer;
 744		runtime->buffer = newbuf;
 745		runtime->buffer_size = params->buffer_size;
 746		__reset_runtime_ptrs(runtime, is_input);
 747		spin_unlock_irq(&substream->lock);
 748		kvfree(oldbuf);
 749	}
 750	runtime->avail_min = params->avail_min;
 
 751	return 0;
 752}
 753
 754int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 755			      struct snd_rawmidi_params *params)
 756{
 757	int err;
 758
 759	snd_rawmidi_drain_output(substream);
 760	mutex_lock(&substream->rmidi->open_mutex);
 761	if (substream->append && substream->use_count > 1)
 762		err = -EBUSY;
 763	else
 764		err = resize_runtime_buffer(substream, params, false);
 765
 766	if (!err)
 767		substream->active_sensing = !params->no_active_sensing;
 768	mutex_unlock(&substream->rmidi->open_mutex);
 769	return err;
 770}
 771EXPORT_SYMBOL(snd_rawmidi_output_params);
 772
 773int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 774			     struct snd_rawmidi_params *params)
 775{
 776	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 777	unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
 778	int err;
 779
 780	snd_rawmidi_drain_input(substream);
 781	mutex_lock(&substream->rmidi->open_mutex);
 782	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
 783		err = -EINVAL;
 784	else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
 785		err = -EINVAL;
 786	else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
 787		err = -EINVAL;
 788	else
 789		err = resize_runtime_buffer(substream, params, true);
 790
 791	if (!err) {
 792		substream->framing = framing;
 793		substream->clock_type = clock_type;
 794	}
 795	mutex_unlock(&substream->rmidi->open_mutex);
 
 
 
 
 
 
 
 
 796	return 0;
 797}
 798EXPORT_SYMBOL(snd_rawmidi_input_params);
 799
 800static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 801				     struct snd_rawmidi_status64 *status)
 802{
 803	struct snd_rawmidi_runtime *runtime = substream->runtime;
 804
 805	memset(status, 0, sizeof(*status));
 806	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 807	spin_lock_irq(&substream->lock);
 808	status->avail = runtime->avail;
 809	spin_unlock_irq(&substream->lock);
 810	return 0;
 811}
 812
 813static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 814				    struct snd_rawmidi_status64 *status)
 815{
 816	struct snd_rawmidi_runtime *runtime = substream->runtime;
 817
 818	memset(status, 0, sizeof(*status));
 819	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 820	spin_lock_irq(&substream->lock);
 821	status->avail = runtime->avail;
 822	status->xruns = runtime->xruns;
 823	runtime->xruns = 0;
 824	spin_unlock_irq(&substream->lock);
 825	return 0;
 826}
 827
 828static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 829				      struct snd_rawmidi_status32 __user *argp)
 830{
 831	int err = 0;
 832	struct snd_rawmidi_status32 __user *status = argp;
 833	struct snd_rawmidi_status32 status32;
 834	struct snd_rawmidi_status64 status64;
 835
 836	if (copy_from_user(&status32, argp,
 837			   sizeof(struct snd_rawmidi_status32)))
 838		return -EFAULT;
 839
 840	switch (status32.stream) {
 841	case SNDRV_RAWMIDI_STREAM_OUTPUT:
 842		if (rfile->output == NULL)
 843			return -EINVAL;
 844		err = snd_rawmidi_output_status(rfile->output, &status64);
 845		break;
 846	case SNDRV_RAWMIDI_STREAM_INPUT:
 847		if (rfile->input == NULL)
 848			return -EINVAL;
 849		err = snd_rawmidi_input_status(rfile->input, &status64);
 850		break;
 851	default:
 852		return -EINVAL;
 853	}
 854	if (err < 0)
 855		return err;
 856
 857	status32 = (struct snd_rawmidi_status32) {
 858		.stream = status64.stream,
 859		.tstamp_sec = status64.tstamp_sec,
 860		.tstamp_nsec = status64.tstamp_nsec,
 861		.avail = status64.avail,
 862		.xruns = status64.xruns,
 863	};
 864
 865	if (copy_to_user(status, &status32, sizeof(*status)))
 866		return -EFAULT;
 867
 868	return 0;
 869}
 870
 871static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 872				      struct snd_rawmidi_status64 __user *argp)
 873{
 874	int err = 0;
 875	struct snd_rawmidi_status64 status;
 876
 877	if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 878		return -EFAULT;
 879
 880	switch (status.stream) {
 881	case SNDRV_RAWMIDI_STREAM_OUTPUT:
 882		if (rfile->output == NULL)
 883			return -EINVAL;
 884		err = snd_rawmidi_output_status(rfile->output, &status);
 885		break;
 886	case SNDRV_RAWMIDI_STREAM_INPUT:
 887		if (rfile->input == NULL)
 888			return -EINVAL;
 889		err = snd_rawmidi_input_status(rfile->input, &status);
 890		break;
 891	default:
 892		return -EINVAL;
 893	}
 894	if (err < 0)
 895		return err;
 896	if (copy_to_user(argp, &status,
 897			 sizeof(struct snd_rawmidi_status64)))
 898		return -EFAULT;
 899	return 0;
 900}
 901
 902static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 903{
 904	struct snd_rawmidi_file *rfile;
 905	void __user *argp = (void __user *)arg;
 906
 907	rfile = file->private_data;
 908	if (((cmd >> 8) & 0xff) != 'W')
 909		return -ENOTTY;
 910	switch (cmd) {
 911	case SNDRV_RAWMIDI_IOCTL_PVERSION:
 912		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 913	case SNDRV_RAWMIDI_IOCTL_INFO:
 914	{
 915		int stream;
 916		struct snd_rawmidi_info __user *info = argp;
 917
 918		if (get_user(stream, &info->stream))
 919			return -EFAULT;
 920		switch (stream) {
 921		case SNDRV_RAWMIDI_STREAM_INPUT:
 922			return snd_rawmidi_info_user(rfile->input, info);
 923		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 924			return snd_rawmidi_info_user(rfile->output, info);
 925		default:
 926			return -EINVAL;
 927		}
 928	}
 929	case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
 930		if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
 931			return -EFAULT;
 932		return 0;
 933
 934	case SNDRV_RAWMIDI_IOCTL_PARAMS:
 935	{
 936		struct snd_rawmidi_params params;
 937
 938		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 939			return -EFAULT;
 940		if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
 941			params.mode = 0;
 942			memset(params.reserved, 0, sizeof(params.reserved));
 943		}
 944		switch (params.stream) {
 945		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 946			if (rfile->output == NULL)
 947				return -EINVAL;
 948			return snd_rawmidi_output_params(rfile->output, &params);
 949		case SNDRV_RAWMIDI_STREAM_INPUT:
 950			if (rfile->input == NULL)
 951				return -EINVAL;
 952			return snd_rawmidi_input_params(rfile->input, &params);
 953		default:
 954			return -EINVAL;
 955		}
 956	}
 957	case SNDRV_RAWMIDI_IOCTL_STATUS32:
 958		return snd_rawmidi_ioctl_status32(rfile, argp);
 959	case SNDRV_RAWMIDI_IOCTL_STATUS64:
 960		return snd_rawmidi_ioctl_status64(rfile, argp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 961	case SNDRV_RAWMIDI_IOCTL_DROP:
 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_drop_output(rfile->output);
 972		default:
 973			return -EINVAL;
 974		}
 975	}
 976	case SNDRV_RAWMIDI_IOCTL_DRAIN:
 977	{
 978		int val;
 979
 980		if (get_user(val, (int __user *) argp))
 981			return -EFAULT;
 982		switch (val) {
 983		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 984			if (rfile->output == NULL)
 985				return -EINVAL;
 986			return snd_rawmidi_drain_output(rfile->output);
 987		case SNDRV_RAWMIDI_STREAM_INPUT:
 988			if (rfile->input == NULL)
 989				return -EINVAL;
 990			return snd_rawmidi_drain_input(rfile->input);
 991		default:
 992			return -EINVAL;
 993		}
 994	}
 995	default:
 996		rmidi_dbg(rfile->rmidi,
 997			  "rawmidi: unknown command = 0x%x\n", cmd);
 998	}
 999	return -ENOTTY;
1000}
1001
1002static int snd_rawmidi_control_ioctl(struct snd_card *card,
1003				     struct snd_ctl_file *control,
1004				     unsigned int cmd,
1005				     unsigned long arg)
1006{
1007	void __user *argp = (void __user *)arg;
1008
1009	switch (cmd) {
1010	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1011	{
1012		int device;
1013
1014		if (get_user(device, (int __user *)argp))
1015			return -EFAULT;
1016		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1017			device = SNDRV_RAWMIDI_DEVICES - 1;
1018		mutex_lock(&register_mutex);
1019		device = device < 0 ? 0 : device + 1;
1020		while (device < SNDRV_RAWMIDI_DEVICES) {
1021			if (snd_rawmidi_search(card, device))
1022				break;
1023			device++;
1024		}
1025		if (device == SNDRV_RAWMIDI_DEVICES)
1026			device = -1;
1027		mutex_unlock(&register_mutex);
1028		if (put_user(device, (int __user *)argp))
1029			return -EFAULT;
1030		return 0;
1031	}
1032	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1033	{
1034		int val;
1035
1036		if (get_user(val, (int __user *)argp))
1037			return -EFAULT;
1038		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1039		return 0;
1040	}
1041	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1042		return snd_rawmidi_info_select_user(card, argp);
1043	}
1044	return -ENOIOCTLCMD;
1045}
1046
1047static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1048			const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1049{
1050	struct snd_rawmidi_runtime *runtime = substream->runtime;
1051	struct snd_rawmidi_framing_tstamp *dest_ptr;
1052	struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1053	int orig_count = src_count;
1054	int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1055
1056	BUILD_BUG_ON(frame_size != 0x20);
1057	if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1058		return -EINVAL;
1059
1060	while (src_count > 0) {
1061		if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1062			runtime->xruns += src_count;
1063			break;
1064		}
1065		if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1066			frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1067		else {
1068			frame.length = src_count;
1069			memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1070		}
1071		memcpy(frame.data, buffer, frame.length);
1072		buffer += frame.length;
1073		src_count -= frame.length;
1074		dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1075		*dest_ptr = frame;
1076		runtime->avail += frame_size;
1077		runtime->hw_ptr += frame_size;
1078		runtime->hw_ptr %= runtime->buffer_size;
1079	}
1080	return orig_count - src_count;
1081}
1082
1083static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1084{
1085	struct timespec64 ts64 = {0, 0};
1086
1087	switch (substream->clock_type) {
1088	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1089		ktime_get_raw_ts64(&ts64);
1090		break;
1091	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1092		ktime_get_ts64(&ts64);
1093		break;
1094	case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1095		ktime_get_real_ts64(&ts64);
1096		break;
1097	}
1098	return ts64;
1099}
1100
1101/**
1102 * snd_rawmidi_receive - receive the input data from the device
1103 * @substream: the rawmidi substream
1104 * @buffer: the buffer pointer
1105 * @count: the data size to read
1106 *
1107 * Reads the data from the internal buffer.
1108 *
1109 * Return: The size of read data, or a negative error code on failure.
1110 */
1111int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1112			const unsigned char *buffer, int count)
1113{
1114	unsigned long flags;
1115	struct timespec64 ts64 = get_framing_tstamp(substream);
1116	int result = 0, count1;
1117	struct snd_rawmidi_runtime *runtime;
1118
1119	spin_lock_irqsave(&substream->lock, flags);
1120	if (!substream->opened) {
1121		result = -EBADFD;
1122		goto unlock;
1123	}
1124	runtime = substream->runtime;
1125	if (!runtime || !runtime->buffer) {
1126		rmidi_dbg(substream->rmidi,
1127			  "snd_rawmidi_receive: input is not active!!!\n");
1128		result = -EINVAL;
1129		goto unlock;
1130	}
1131
1132	if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1133		result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1134	} else if (count == 1) {	/* special case, faster code */
1135		substream->bytes++;
1136		if (runtime->avail < runtime->buffer_size) {
1137			runtime->buffer[runtime->hw_ptr++] = buffer[0];
1138			runtime->hw_ptr %= runtime->buffer_size;
1139			runtime->avail++;
1140			result++;
1141		} else {
1142			runtime->xruns++;
1143		}
1144	} else {
1145		substream->bytes += count;
1146		count1 = runtime->buffer_size - runtime->hw_ptr;
1147		if (count1 > count)
1148			count1 = count;
1149		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1150			count1 = runtime->buffer_size - runtime->avail;
1151		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1152		runtime->hw_ptr += count1;
1153		runtime->hw_ptr %= runtime->buffer_size;
1154		runtime->avail += count1;
1155		count -= count1;
1156		result += count1;
1157		if (count > 0) {
1158			buffer += count1;
1159			count1 = count;
1160			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1161				count1 = runtime->buffer_size - runtime->avail;
1162				runtime->xruns += count - count1;
1163			}
1164			if (count1 > 0) {
1165				memcpy(runtime->buffer, buffer, count1);
1166				runtime->hw_ptr = count1;
1167				runtime->avail += count1;
1168				result += count1;
1169			}
1170		}
1171	}
1172	if (result > 0) {
1173		if (runtime->event)
1174			schedule_work(&runtime->event_work);
1175		else if (__snd_rawmidi_ready(runtime))
1176			wake_up(&runtime->sleep);
1177	}
1178 unlock:
1179	spin_unlock_irqrestore(&substream->lock, flags);
1180	return result;
1181}
1182EXPORT_SYMBOL(snd_rawmidi_receive);
1183
1184static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1185				     unsigned char __user *userbuf,
1186				     unsigned char *kernelbuf, long count)
1187{
1188	unsigned long flags;
1189	long result = 0, count1;
1190	struct snd_rawmidi_runtime *runtime = substream->runtime;
1191	unsigned long appl_ptr;
1192	int err = 0;
1193
1194	spin_lock_irqsave(&substream->lock, flags);
1195	snd_rawmidi_buffer_ref(runtime);
1196	while (count > 0 && runtime->avail) {
1197		count1 = runtime->buffer_size - runtime->appl_ptr;
1198		if (count1 > count)
1199			count1 = count;
1200		if (count1 > (int)runtime->avail)
1201			count1 = runtime->avail;
1202
1203		/* update runtime->appl_ptr before unlocking for userbuf */
1204		appl_ptr = runtime->appl_ptr;
1205		runtime->appl_ptr += count1;
1206		runtime->appl_ptr %= runtime->buffer_size;
1207		runtime->avail -= count1;
1208
1209		if (kernelbuf)
1210			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1211		if (userbuf) {
1212			spin_unlock_irqrestore(&substream->lock, flags);
1213			if (copy_to_user(userbuf + result,
1214					 runtime->buffer + appl_ptr, count1))
1215				err = -EFAULT;
1216			spin_lock_irqsave(&substream->lock, flags);
1217			if (err)
1218				goto out;
1219		}
1220		result += count1;
1221		count -= count1;
1222	}
1223 out:
1224	snd_rawmidi_buffer_unref(runtime);
1225	spin_unlock_irqrestore(&substream->lock, flags);
1226	return result > 0 ? result : err;
1227}
1228
1229long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1230			     unsigned char *buf, long count)
1231{
1232	snd_rawmidi_input_trigger(substream, 1);
1233	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1234}
1235EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1236
1237static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1238				loff_t *offset)
1239{
1240	long result;
1241	int count1;
1242	struct snd_rawmidi_file *rfile;
1243	struct snd_rawmidi_substream *substream;
1244	struct snd_rawmidi_runtime *runtime;
1245
1246	rfile = file->private_data;
1247	substream = rfile->input;
1248	if (substream == NULL)
1249		return -EIO;
1250	runtime = substream->runtime;
1251	snd_rawmidi_input_trigger(substream, 1);
1252	result = 0;
1253	while (count > 0) {
1254		spin_lock_irq(&substream->lock);
1255		while (!__snd_rawmidi_ready(runtime)) {
1256			wait_queue_entry_t wait;
1257
1258			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1259				spin_unlock_irq(&substream->lock);
1260				return result > 0 ? result : -EAGAIN;
1261			}
1262			init_waitqueue_entry(&wait, current);
1263			add_wait_queue(&runtime->sleep, &wait);
1264			set_current_state(TASK_INTERRUPTIBLE);
1265			spin_unlock_irq(&substream->lock);
1266			schedule();
1267			remove_wait_queue(&runtime->sleep, &wait);
1268			if (rfile->rmidi->card->shutdown)
1269				return -ENODEV;
1270			if (signal_pending(current))
1271				return result > 0 ? result : -ERESTARTSYS;
1272			spin_lock_irq(&substream->lock);
1273			if (!runtime->avail) {
1274				spin_unlock_irq(&substream->lock);
1275				return result > 0 ? result : -EIO;
1276			}
1277		}
1278		spin_unlock_irq(&substream->lock);
1279		count1 = snd_rawmidi_kernel_read1(substream,
1280						  (unsigned char __user *)buf,
1281						  NULL/*kernelbuf*/,
1282						  count);
1283		if (count1 < 0)
1284			return result > 0 ? result : count1;
1285		result += count1;
1286		buf += count1;
1287		count -= count1;
1288	}
1289	return result;
1290}
1291
1292/**
1293 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1294 * @substream: the rawmidi substream
1295 *
1296 * Return: 1 if the internal output buffer is empty, 0 if not.
1297 */
1298int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1299{
1300	struct snd_rawmidi_runtime *runtime;
1301	int result;
1302	unsigned long flags;
1303
1304	spin_lock_irqsave(&substream->lock, flags);
1305	runtime = substream->runtime;
1306	if (!substream->opened || !runtime || !runtime->buffer) {
1307		rmidi_dbg(substream->rmidi,
1308			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1309		result = 1;
1310	} else {
1311		result = runtime->avail >= runtime->buffer_size;
1312	}
1313	spin_unlock_irqrestore(&substream->lock, flags);
1314	return result;
 
 
1315}
1316EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1317
1318/*
1319 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1320 * @substream: the rawmidi substream
1321 * @buffer: the buffer pointer
1322 * @count: data size to transfer
1323 *
1324 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1325 */
1326static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1327				       unsigned char *buffer, int count)
1328{
1329	int result, count1;
1330	struct snd_rawmidi_runtime *runtime = substream->runtime;
1331
1332	if (runtime->buffer == NULL) {
1333		rmidi_dbg(substream->rmidi,
1334			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1335		return -EINVAL;
1336	}
1337	result = 0;
1338	if (runtime->avail >= runtime->buffer_size) {
1339		/* warning: lowlevel layer MUST trigger down the hardware */
1340		goto __skip;
1341	}
1342	if (count == 1) {	/* special case, faster code */
1343		*buffer = runtime->buffer[runtime->hw_ptr];
1344		result++;
1345	} else {
1346		count1 = runtime->buffer_size - runtime->hw_ptr;
1347		if (count1 > count)
1348			count1 = count;
1349		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1350			count1 = runtime->buffer_size - runtime->avail;
1351		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1352		count -= count1;
1353		result += count1;
1354		if (count > 0) {
1355			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1356				count = runtime->buffer_size - runtime->avail - count1;
1357			memcpy(buffer + count1, runtime->buffer, count);
1358			result += count;
1359		}
1360	}
1361      __skip:
1362	return result;
1363}
 
1364
1365/**
1366 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1367 * @substream: the rawmidi substream
1368 * @buffer: the buffer pointer
1369 * @count: data size to transfer
1370 *
1371 * Copies data from the internal output buffer to the given buffer.
1372 *
1373 * Call this in the interrupt handler when the midi output is ready,
1374 * and call snd_rawmidi_transmit_ack() after the transmission is
1375 * finished.
1376 *
1377 * Return: The size of copied data, or a negative error code on failure.
1378 */
1379int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1380			      unsigned char *buffer, int count)
1381{
 
1382	int result;
1383	unsigned long flags;
1384
1385	spin_lock_irqsave(&substream->lock, flags);
1386	if (!substream->opened || !substream->runtime)
1387		result = -EBADFD;
1388	else
1389		result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1390	spin_unlock_irqrestore(&substream->lock, flags);
1391	return result;
1392}
1393EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1394
1395/*
1396 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1397 * @substream: the rawmidi substream
1398 * @count: the transferred count
1399 *
1400 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1401 */
1402static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1403				      int count)
1404{
1405	struct snd_rawmidi_runtime *runtime = substream->runtime;
1406
1407	if (runtime->buffer == NULL) {
1408		rmidi_dbg(substream->rmidi,
1409			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1410		return -EINVAL;
1411	}
1412	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1413	runtime->hw_ptr += count;
1414	runtime->hw_ptr %= runtime->buffer_size;
1415	runtime->avail += count;
1416	substream->bytes += count;
1417	if (count > 0) {
1418		if (runtime->drain || __snd_rawmidi_ready(runtime))
1419			wake_up(&runtime->sleep);
1420	}
1421	return count;
1422}
 
1423
1424/**
1425 * snd_rawmidi_transmit_ack - acknowledge the transmission
1426 * @substream: the rawmidi substream
1427 * @count: the transferred count
1428 *
1429 * Advances the hardware pointer for the internal output buffer with
1430 * the given size and updates the condition.
1431 * Call after the transmission is finished.
1432 *
1433 * Return: The advanced size if successful, or a negative error code on failure.
1434 */
1435int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1436{
 
1437	int result;
1438	unsigned long flags;
1439
1440	spin_lock_irqsave(&substream->lock, flags);
1441	if (!substream->opened || !substream->runtime)
1442		result = -EBADFD;
1443	else
1444		result = __snd_rawmidi_transmit_ack(substream, count);
1445	spin_unlock_irqrestore(&substream->lock, flags);
1446	return result;
1447}
1448EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1449
1450/**
1451 * snd_rawmidi_transmit - copy from the buffer to the device
1452 * @substream: the rawmidi substream
1453 * @buffer: the buffer pointer
1454 * @count: the data size to transfer
1455 *
1456 * Copies data from the buffer to the device and advances the pointer.
1457 *
1458 * Return: The copied size if successful, or a negative error code on failure.
1459 */
1460int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1461			 unsigned char *buffer, int count)
1462{
 
1463	int result;
1464	unsigned long flags;
1465
1466	spin_lock_irqsave(&substream->lock, flags);
1467	if (!substream->opened)
1468		result = -EBADFD;
1469	else {
1470		count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1471		if (count <= 0)
1472			result = count;
1473		else
1474			result = __snd_rawmidi_transmit_ack(substream, count);
1475	}
1476	spin_unlock_irqrestore(&substream->lock, flags);
1477	return result;
1478}
1479EXPORT_SYMBOL(snd_rawmidi_transmit);
1480
1481/**
1482 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1483 * @substream: rawmidi substream
1484 *
1485 * Return: the number of discarded bytes
1486 */
1487int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1488{
1489	struct snd_rawmidi_runtime *runtime;
1490	unsigned long flags;
1491	int count = 0;
1492
1493	spin_lock_irqsave(&substream->lock, flags);
1494	runtime = substream->runtime;
1495	if (substream->opened && runtime &&
1496	    runtime->avail < runtime->buffer_size) {
1497		count = runtime->buffer_size - runtime->avail;
1498		__snd_rawmidi_transmit_ack(substream, count);
1499	}
1500	spin_unlock_irqrestore(&substream->lock, flags);
1501	return count;
1502}
1503EXPORT_SYMBOL(snd_rawmidi_proceed);
1504
1505static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1506				      const unsigned char __user *userbuf,
1507				      const unsigned char *kernelbuf,
1508				      long count)
1509{
1510	unsigned long flags;
1511	long count1, result;
1512	struct snd_rawmidi_runtime *runtime = substream->runtime;
1513	unsigned long appl_ptr;
1514
1515	if (!kernelbuf && !userbuf)
1516		return -EINVAL;
1517	if (snd_BUG_ON(!runtime->buffer))
1518		return -EINVAL;
1519
1520	result = 0;
1521	spin_lock_irqsave(&substream->lock, flags);
1522	if (substream->append) {
1523		if ((long)runtime->avail < count) {
1524			spin_unlock_irqrestore(&substream->lock, flags);
1525			return -EAGAIN;
1526		}
1527	}
1528	snd_rawmidi_buffer_ref(runtime);
1529	while (count > 0 && runtime->avail > 0) {
1530		count1 = runtime->buffer_size - runtime->appl_ptr;
1531		if (count1 > count)
1532			count1 = count;
1533		if (count1 > (long)runtime->avail)
1534			count1 = runtime->avail;
1535
1536		/* update runtime->appl_ptr before unlocking for userbuf */
1537		appl_ptr = runtime->appl_ptr;
1538		runtime->appl_ptr += count1;
1539		runtime->appl_ptr %= runtime->buffer_size;
1540		runtime->avail -= count1;
1541
1542		if (kernelbuf)
1543			memcpy(runtime->buffer + appl_ptr,
1544			       kernelbuf + result, count1);
1545		else if (userbuf) {
1546			spin_unlock_irqrestore(&substream->lock, flags);
1547			if (copy_from_user(runtime->buffer + appl_ptr,
1548					   userbuf + result, count1)) {
1549				spin_lock_irqsave(&substream->lock, flags);
1550				result = result > 0 ? result : -EFAULT;
1551				goto __end;
1552			}
1553			spin_lock_irqsave(&substream->lock, flags);
1554		}
1555		result += count1;
1556		count -= count1;
1557	}
1558      __end:
1559	count1 = runtime->avail < runtime->buffer_size;
1560	snd_rawmidi_buffer_unref(runtime);
1561	spin_unlock_irqrestore(&substream->lock, flags);
1562	if (count1)
1563		snd_rawmidi_output_trigger(substream, 1);
1564	return result;
1565}
1566
1567long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1568			      const unsigned char *buf, long count)
1569{
1570	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1571}
1572EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1573
1574static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1575				 size_t count, loff_t *offset)
1576{
1577	long result, timeout;
1578	int count1;
1579	struct snd_rawmidi_file *rfile;
1580	struct snd_rawmidi_runtime *runtime;
1581	struct snd_rawmidi_substream *substream;
1582
1583	rfile = file->private_data;
1584	substream = rfile->output;
1585	runtime = substream->runtime;
1586	/* we cannot put an atomic message to our buffer */
1587	if (substream->append && count > runtime->buffer_size)
1588		return -EIO;
1589	result = 0;
1590	while (count > 0) {
1591		spin_lock_irq(&substream->lock);
1592		while (!snd_rawmidi_ready_append(substream, count)) {
1593			wait_queue_entry_t wait;
1594
1595			if (file->f_flags & O_NONBLOCK) {
1596				spin_unlock_irq(&substream->lock);
1597				return result > 0 ? result : -EAGAIN;
1598			}
1599			init_waitqueue_entry(&wait, current);
1600			add_wait_queue(&runtime->sleep, &wait);
1601			set_current_state(TASK_INTERRUPTIBLE);
1602			spin_unlock_irq(&substream->lock);
1603			timeout = schedule_timeout(30 * HZ);
1604			remove_wait_queue(&runtime->sleep, &wait);
1605			if (rfile->rmidi->card->shutdown)
1606				return -ENODEV;
1607			if (signal_pending(current))
1608				return result > 0 ? result : -ERESTARTSYS;
1609			spin_lock_irq(&substream->lock);
1610			if (!runtime->avail && !timeout) {
1611				spin_unlock_irq(&substream->lock);
1612				return result > 0 ? result : -EIO;
1613			}
1614		}
1615		spin_unlock_irq(&substream->lock);
1616		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1617		if (count1 < 0)
1618			return result > 0 ? result : count1;
1619		result += count1;
1620		buf += count1;
1621		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1622			break;
1623		count -= count1;
1624	}
1625	if (file->f_flags & O_DSYNC) {
1626		spin_lock_irq(&substream->lock);
1627		while (runtime->avail != runtime->buffer_size) {
1628			wait_queue_entry_t wait;
1629			unsigned int last_avail = runtime->avail;
1630
1631			init_waitqueue_entry(&wait, current);
1632			add_wait_queue(&runtime->sleep, &wait);
1633			set_current_state(TASK_INTERRUPTIBLE);
1634			spin_unlock_irq(&substream->lock);
1635			timeout = schedule_timeout(30 * HZ);
1636			remove_wait_queue(&runtime->sleep, &wait);
1637			if (signal_pending(current))
1638				return result > 0 ? result : -ERESTARTSYS;
1639			if (runtime->avail == last_avail && !timeout)
1640				return result > 0 ? result : -EIO;
1641			spin_lock_irq(&substream->lock);
1642		}
1643		spin_unlock_irq(&substream->lock);
1644	}
1645	return result;
1646}
1647
1648static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1649{
1650	struct snd_rawmidi_file *rfile;
1651	struct snd_rawmidi_runtime *runtime;
1652	__poll_t mask;
1653
1654	rfile = file->private_data;
1655	if (rfile->input != NULL) {
1656		runtime = rfile->input->runtime;
1657		snd_rawmidi_input_trigger(rfile->input, 1);
1658		poll_wait(file, &runtime->sleep, wait);
1659	}
1660	if (rfile->output != NULL) {
1661		runtime = rfile->output->runtime;
1662		poll_wait(file, &runtime->sleep, wait);
1663	}
1664	mask = 0;
1665	if (rfile->input != NULL) {
1666		if (snd_rawmidi_ready(rfile->input))
1667			mask |= EPOLLIN | EPOLLRDNORM;
1668	}
1669	if (rfile->output != NULL) {
1670		if (snd_rawmidi_ready(rfile->output))
1671			mask |= EPOLLOUT | EPOLLWRNORM;
1672	}
1673	return mask;
1674}
1675
1676/*
1677 */
1678#ifdef CONFIG_COMPAT
1679#include "rawmidi_compat.c"
1680#else
1681#define snd_rawmidi_ioctl_compat	NULL
1682#endif
1683
1684/*
 
1685 */
1686
1687static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1688				       struct snd_info_buffer *buffer)
1689{
1690	struct snd_rawmidi *rmidi;
1691	struct snd_rawmidi_substream *substream;
1692	struct snd_rawmidi_runtime *runtime;
1693	unsigned long buffer_size, avail, xruns;
1694	unsigned int clock_type;
1695	static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1696
1697	rmidi = entry->private_data;
1698	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1699	mutex_lock(&rmidi->open_mutex);
1700	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1701		list_for_each_entry(substream,
1702				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1703				    list) {
1704			snd_iprintf(buffer,
1705				    "Output %d\n"
1706				    "  Tx bytes     : %lu\n",
1707				    substream->number,
1708				    (unsigned long) substream->bytes);
1709			if (substream->opened) {
1710				snd_iprintf(buffer,
1711				    "  Owner PID    : %d\n",
1712				    pid_vnr(substream->pid));
1713				runtime = substream->runtime;
1714				spin_lock_irq(&substream->lock);
1715				buffer_size = runtime->buffer_size;
1716				avail = runtime->avail;
1717				spin_unlock_irq(&substream->lock);
1718				snd_iprintf(buffer,
1719				    "  Mode         : %s\n"
1720				    "  Buffer size  : %lu\n"
1721				    "  Avail        : %lu\n",
1722				    runtime->oss ? "OSS compatible" : "native",
1723				    buffer_size, avail);
 
1724			}
1725		}
1726	}
1727	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1728		list_for_each_entry(substream,
1729				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1730				    list) {
1731			snd_iprintf(buffer,
1732				    "Input %d\n"
1733				    "  Rx bytes     : %lu\n",
1734				    substream->number,
1735				    (unsigned long) substream->bytes);
1736			if (substream->opened) {
1737				snd_iprintf(buffer,
1738					    "  Owner PID    : %d\n",
1739					    pid_vnr(substream->pid));
1740				runtime = substream->runtime;
1741				spin_lock_irq(&substream->lock);
1742				buffer_size = runtime->buffer_size;
1743				avail = runtime->avail;
1744				xruns = runtime->xruns;
1745				spin_unlock_irq(&substream->lock);
1746				snd_iprintf(buffer,
1747					    "  Buffer size  : %lu\n"
1748					    "  Avail        : %lu\n"
1749					    "  Overruns     : %lu\n",
1750					    buffer_size, avail, xruns);
1751				if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1752					clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1753					if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1754						snd_iprintf(buffer,
1755							    "  Framing      : tstamp\n"
1756							    "  Clock type   : %s\n",
1757							    clock_names[clock_type]);
1758				}
1759			}
1760		}
1761	}
1762	mutex_unlock(&rmidi->open_mutex);
1763}
1764
1765/*
1766 *  Register functions
1767 */
1768
1769static const struct file_operations snd_rawmidi_f_ops = {
 
1770	.owner =	THIS_MODULE,
1771	.read =		snd_rawmidi_read,
1772	.write =	snd_rawmidi_write,
1773	.open =		snd_rawmidi_open,
1774	.release =	snd_rawmidi_release,
1775	.llseek =	no_llseek,
1776	.poll =		snd_rawmidi_poll,
1777	.unlocked_ioctl =	snd_rawmidi_ioctl,
1778	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1779};
1780
1781static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1782					struct snd_rawmidi_str *stream,
1783					int direction,
1784					int count)
1785{
1786	struct snd_rawmidi_substream *substream;
1787	int idx;
1788
1789	for (idx = 0; idx < count; idx++) {
1790		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1791		if (!substream)
1792			return -ENOMEM;
1793		substream->stream = direction;
1794		substream->number = idx;
1795		substream->rmidi = rmidi;
1796		substream->pstr = stream;
1797		spin_lock_init(&substream->lock);
1798		list_add_tail(&substream->list, &stream->substreams);
1799		stream->substream_count++;
1800	}
1801	return 0;
1802}
1803
1804static void release_rawmidi_device(struct device *dev)
1805{
1806	kfree(container_of(dev, struct snd_rawmidi, dev));
1807}
1808
1809/**
1810 * snd_rawmidi_new - create a rawmidi instance
1811 * @card: the card instance
1812 * @id: the id string
1813 * @device: the device index
1814 * @output_count: the number of output streams
1815 * @input_count: the number of input streams
1816 * @rrawmidi: the pointer to store the new rawmidi instance
1817 *
1818 * Creates a new rawmidi instance.
1819 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1820 *
1821 * Return: Zero if successful, or a negative error code on failure.
1822 */
1823int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1824		    int output_count, int input_count,
1825		    struct snd_rawmidi **rrawmidi)
1826{
1827	struct snd_rawmidi *rmidi;
1828	int err;
1829	static const struct snd_device_ops ops = {
1830		.dev_free = snd_rawmidi_dev_free,
1831		.dev_register = snd_rawmidi_dev_register,
1832		.dev_disconnect = snd_rawmidi_dev_disconnect,
1833	};
1834
1835	if (snd_BUG_ON(!card))
1836		return -ENXIO;
1837	if (rrawmidi)
1838		*rrawmidi = NULL;
1839	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1840	if (!rmidi)
1841		return -ENOMEM;
1842	rmidi->card = card;
1843	rmidi->device = device;
1844	mutex_init(&rmidi->open_mutex);
1845	init_waitqueue_head(&rmidi->open_wait);
1846	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1847	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1848
1849	if (id != NULL)
1850		strscpy(rmidi->id, id, sizeof(rmidi->id));
1851
1852	snd_device_initialize(&rmidi->dev, card);
1853	rmidi->dev.release = release_rawmidi_device;
1854	dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1855
1856	err = snd_rawmidi_alloc_substreams(rmidi,
1857					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1858					   SNDRV_RAWMIDI_STREAM_INPUT,
1859					   input_count);
1860	if (err < 0)
1861		goto error;
1862	err = snd_rawmidi_alloc_substreams(rmidi,
1863					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1864					   SNDRV_RAWMIDI_STREAM_OUTPUT,
1865					   output_count);
1866	if (err < 0)
1867		goto error;
1868	err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1869	if (err < 0)
1870		goto error;
1871
 
 
1872	if (rrawmidi)
1873		*rrawmidi = rmidi;
1874	return 0;
1875
1876 error:
1877	snd_rawmidi_free(rmidi);
1878	return err;
1879}
1880EXPORT_SYMBOL(snd_rawmidi_new);
1881
1882static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1883{
1884	struct snd_rawmidi_substream *substream;
1885
1886	while (!list_empty(&stream->substreams)) {
1887		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1888		list_del(&substream->list);
1889		kfree(substream);
1890	}
1891}
1892
1893static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1894{
1895	if (!rmidi)
1896		return 0;
1897
1898	snd_info_free_entry(rmidi->proc_entry);
1899	rmidi->proc_entry = NULL;
 
1900	if (rmidi->ops && rmidi->ops->dev_unregister)
1901		rmidi->ops->dev_unregister(rmidi);
 
1902
1903	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1904	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1905	if (rmidi->private_free)
1906		rmidi->private_free(rmidi);
1907	put_device(&rmidi->dev);
1908	return 0;
1909}
1910
1911static int snd_rawmidi_dev_free(struct snd_device *device)
1912{
1913	struct snd_rawmidi *rmidi = device->device_data;
1914
1915	return snd_rawmidi_free(rmidi);
1916}
1917
1918#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1919static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1920{
1921	struct snd_rawmidi *rmidi = device->private_data;
1922
1923	rmidi->seq_dev = NULL;
1924}
1925#endif
1926
1927static int snd_rawmidi_dev_register(struct snd_device *device)
1928{
1929	int err;
1930	struct snd_info_entry *entry;
1931	char name[16];
1932	struct snd_rawmidi *rmidi = device->device_data;
1933
1934	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1935		return -ENOMEM;
1936	err = 0;
1937	mutex_lock(&register_mutex);
1938	if (snd_rawmidi_search(rmidi->card, rmidi->device))
1939		err = -EBUSY;
1940	else
1941		list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1942	mutex_unlock(&register_mutex);
1943	if (err < 0)
1944		return err;
1945
1946	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1947				  rmidi->card, rmidi->device,
1948				  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1949	if (err < 0) {
1950		rmidi_err(rmidi, "unable to register\n");
1951		goto error;
 
 
1952	}
1953	if (rmidi->ops && rmidi->ops->dev_register) {
1954		err = rmidi->ops->dev_register(rmidi);
1955		if (err < 0)
1956			goto error_unregister;
 
 
1957	}
1958#ifdef CONFIG_SND_OSSEMUL
1959	rmidi->ossreg = 0;
1960	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1961		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1962					    rmidi->card, 0, &snd_rawmidi_f_ops,
1963					    rmidi) < 0) {
1964			rmidi_err(rmidi,
1965				  "unable to register OSS rawmidi device %i:%i\n",
1966				  rmidi->card->number, 0);
1967		} else {
1968			rmidi->ossreg++;
1969#ifdef SNDRV_OSS_INFO_DEV_MIDI
1970			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1971#endif
1972		}
1973	}
1974	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1975		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1976					    rmidi->card, 1, &snd_rawmidi_f_ops,
1977					    rmidi) < 0) {
1978			rmidi_err(rmidi,
1979				  "unable to register OSS rawmidi device %i:%i\n",
1980				  rmidi->card->number, 1);
1981		} else {
1982			rmidi->ossreg++;
1983		}
1984	}
1985#endif /* CONFIG_SND_OSSEMUL */
 
1986	sprintf(name, "midi%d", rmidi->device);
1987	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1988	if (entry) {
1989		entry->private_data = rmidi;
1990		entry->c.text.read = snd_rawmidi_proc_info_read;
1991		if (snd_info_register(entry) < 0) {
1992			snd_info_free_entry(entry);
1993			entry = NULL;
1994		}
1995	}
1996	rmidi->proc_entry = entry;
1997#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1998	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1999		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2000			rmidi->seq_dev->private_data = rmidi;
2001			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2002			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2003			snd_device_register(rmidi->card, rmidi->seq_dev);
2004		}
2005	}
2006#endif
2007	return 0;
2008
2009 error_unregister:
2010	snd_unregister_device(&rmidi->dev);
2011 error:
2012	mutex_lock(&register_mutex);
2013	list_del(&rmidi->list);
2014	mutex_unlock(&register_mutex);
2015	return err;
2016}
2017
2018static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2019{
2020	struct snd_rawmidi *rmidi = device->device_data;
2021	int dir;
2022
2023	mutex_lock(&register_mutex);
2024	mutex_lock(&rmidi->open_mutex);
2025	wake_up(&rmidi->open_wait);
2026	list_del_init(&rmidi->list);
2027	for (dir = 0; dir < 2; dir++) {
2028		struct snd_rawmidi_substream *s;
2029
2030		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2031			if (s->runtime)
2032				wake_up(&s->runtime->sleep);
2033		}
2034	}
2035
2036#ifdef CONFIG_SND_OSSEMUL
2037	if (rmidi->ossreg) {
2038		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2039			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2040#ifdef SNDRV_OSS_INFO_DEV_MIDI
2041			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2042#endif
2043		}
2044		if ((int)rmidi->device == amidi_map[rmidi->card->number])
2045			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2046		rmidi->ossreg = 0;
2047	}
2048#endif /* CONFIG_SND_OSSEMUL */
2049	snd_unregister_device(&rmidi->dev);
2050	mutex_unlock(&rmidi->open_mutex);
2051	mutex_unlock(&register_mutex);
2052	return 0;
2053}
2054
2055/**
2056 * snd_rawmidi_set_ops - set the rawmidi operators
2057 * @rmidi: the rawmidi instance
2058 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2059 * @ops: the operator table
2060 *
2061 * Sets the rawmidi operators for the given stream direction.
2062 */
2063void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2064			 const struct snd_rawmidi_ops *ops)
2065{
2066	struct snd_rawmidi_substream *substream;
2067
2068	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2069		substream->ops = ops;
2070}
2071EXPORT_SYMBOL(snd_rawmidi_set_ops);
2072
2073/*
2074 *  ENTRY functions
2075 */
2076
2077static int __init alsa_rawmidi_init(void)
2078{
2079
2080	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2081	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2082#ifdef CONFIG_SND_OSSEMUL
2083	{ int i;
2084	/* check device map table */
2085	for (i = 0; i < SNDRV_CARDS; i++) {
2086		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2087			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2088			       i, midi_map[i]);
2089			midi_map[i] = 0;
2090		}
2091		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2092			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2093			       i, amidi_map[i]);
2094			amidi_map[i] = 1;
2095		}
2096	}
2097	}
2098#endif /* CONFIG_SND_OSSEMUL */
2099	return 0;
2100}
2101
2102static void __exit alsa_rawmidi_exit(void)
2103{
2104	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2105	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2106}
2107
2108module_init(alsa_rawmidi_init)
2109module_exit(alsa_rawmidi_exit)