1/*
   2 *  Abstract layer for MIDI v1.0 stream
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 *
  20 */
  21
  22#include <sound/core.h>
  23#include <linux/major.h>
  24#include <linux/init.h>
  25#include <linux/sched.h>
  26#include <linux/slab.h>
  27#include <linux/time.h>
  28#include <linux/wait.h>
  29#include <linux/mutex.h>
  30#include <linux/module.h>
  31#include <linux/delay.h>
  32#include <sound/rawmidi.h>
  33#include <sound/info.h>
  34#include <sound/control.h>
  35#include <sound/minors.h>
  36#include <sound/initval.h>
  37
  38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  40MODULE_LICENSE("GPL");
  41
  42#ifdef CONFIG_SND_OSSEMUL
  43static int midi_map[SNDRV_CARDS];
  44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  45module_param_array(midi_map, int, NULL, 0444);
  46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  47module_param_array(amidi_map, int, NULL, 0444);
  48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  49#endif /* CONFIG_SND_OSSEMUL */
  50
  51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  52static int snd_rawmidi_dev_free(struct snd_device *device);
  53static int snd_rawmidi_dev_register(struct snd_device *device);
  54static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  55
  56static LIST_HEAD(snd_rawmidi_devices);
  57static DEFINE_MUTEX(register_mutex);
  58
  59#define rmidi_err(rmidi, fmt, args...) \
  60	dev_err(&(rmidi)->dev, fmt, ##args)
  61#define rmidi_warn(rmidi, fmt, args...) \
  62	dev_warn(&(rmidi)->dev, fmt, ##args)
  63#define rmidi_dbg(rmidi, fmt, args...) \
  64	dev_dbg(&(rmidi)->dev, fmt, ##args)
  65
  66static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  67{
  68	struct snd_rawmidi *rawmidi;
  69
  70	list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  71		if (rawmidi->card == card && rawmidi->device == device)
  72			return rawmidi;
  73	return NULL;
  74}
  75
  76static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  77{
  78	switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  79	case FMODE_WRITE:
  80		return SNDRV_RAWMIDI_LFLG_OUTPUT;
  81	case FMODE_READ:
  82		return SNDRV_RAWMIDI_LFLG_INPUT;
  83	default:
  84		return SNDRV_RAWMIDI_LFLG_OPEN;
  85	}
  86}
  87
  88static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  89{
  90	struct snd_rawmidi_runtime *runtime = substream->runtime;
  91	return runtime->avail >= runtime->avail_min;
  92}
  93
  94static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  95					   size_t count)
  96{
  97	struct snd_rawmidi_runtime *runtime = substream->runtime;
  98	return runtime->avail >= runtime->avail_min &&
  99	       (!substream->append || runtime->avail >= count);
 100}
 101
 102static void snd_rawmidi_input_event_work(struct work_struct *work)
 103{
 104	struct snd_rawmidi_runtime *runtime =
 105		container_of(work, struct snd_rawmidi_runtime, event_work);
 106	if (runtime->event)
 107		runtime->event(runtime->substream);
 108}
 109
 110static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 111{
 112	struct snd_rawmidi_runtime *runtime;
 113
 114	if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 115		return -ENOMEM;
 116	runtime->substream = substream;
 117	spin_lock_init(&runtime->lock);
 118	init_waitqueue_head(&runtime->sleep);
 119	INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 120	runtime->event = NULL;
 121	runtime->buffer_size = PAGE_SIZE;
 122	runtime->avail_min = 1;
 123	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 124		runtime->avail = 0;
 125	else
 126		runtime->avail = runtime->buffer_size;
 127	if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 128		kfree(runtime);
 129		return -ENOMEM;
 130	}
 131	runtime->appl_ptr = runtime->hw_ptr = 0;
 132	substream->runtime = runtime;
 133	return 0;
 134}
 135
 136static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 137{
 138	struct snd_rawmidi_runtime *runtime = substream->runtime;
 139
 140	kfree(runtime->buffer);
 141	kfree(runtime);
 142	substream->runtime = NULL;
 143	return 0;
 144}
 145
 146static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 147{
 148	if (!substream->opened)
 149		return;
 150	substream->ops->trigger(substream, up);
 151}
 152
 153static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 154{
 155	if (!substream->opened)
 156		return;
 157	substream->ops->trigger(substream, up);
 158	if (!up)
 159		cancel_work_sync(&substream->runtime->event_work);
 160}
 161
 162int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 163{
 164	unsigned long flags;
 165	struct snd_rawmidi_runtime *runtime = substream->runtime;
 166
 167	snd_rawmidi_output_trigger(substream, 0);
 168	runtime->drain = 0;
 169	spin_lock_irqsave(&runtime->lock, flags);
 170	runtime->appl_ptr = runtime->hw_ptr = 0;
 171	runtime->avail = runtime->buffer_size;
 172	spin_unlock_irqrestore(&runtime->lock, flags);
 173	return 0;
 174}
 175EXPORT_SYMBOL(snd_rawmidi_drop_output);
 176
 177int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 178{
 179	int err;
 180	long timeout;
 181	struct snd_rawmidi_runtime *runtime = substream->runtime;
 182
 183	err = 0;
 184	runtime->drain = 1;
 185	timeout = wait_event_interruptible_timeout(runtime->sleep,
 186				(runtime->avail >= runtime->buffer_size),
 187				10*HZ);
 188	if (signal_pending(current))
 189		err = -ERESTARTSYS;
 190	if (runtime->avail < runtime->buffer_size && !timeout) {
 191		rmidi_warn(substream->rmidi,
 192			   "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 193			   (long)runtime->avail, (long)runtime->buffer_size);
 194		err = -EIO;
 195	}
 196	runtime->drain = 0;
 197	if (err != -ERESTARTSYS) {
 198		/* we need wait a while to make sure that Tx FIFOs are empty */
 199		if (substream->ops->drain)
 200			substream->ops->drain(substream);
 201		else
 202			msleep(50);
 203		snd_rawmidi_drop_output(substream);
 204	}
 205	return err;
 206}
 207EXPORT_SYMBOL(snd_rawmidi_drain_output);
 208
 209int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 210{
 211	unsigned long flags;
 212	struct snd_rawmidi_runtime *runtime = substream->runtime;
 213
 214	snd_rawmidi_input_trigger(substream, 0);
 215	runtime->drain = 0;
 216	spin_lock_irqsave(&runtime->lock, flags);
 217	runtime->appl_ptr = runtime->hw_ptr = 0;
 218	runtime->avail = 0;
 219	spin_unlock_irqrestore(&runtime->lock, flags);
 220	return 0;
 221}
 222EXPORT_SYMBOL(snd_rawmidi_drain_input);
 223
 224/* look for an available substream for the given stream direction;
 225 * if a specific subdevice is given, try to assign it
 226 */
 227static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 228			    int stream, int mode,
 229			    struct snd_rawmidi_substream **sub_ret)
 230{
 231	struct snd_rawmidi_substream *substream;
 232	struct snd_rawmidi_str *s = &rmidi->streams[stream];
 233	static unsigned int info_flags[2] = {
 234		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 235		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 236	};
 237
 238	if (!(rmidi->info_flags & info_flags[stream]))
 239		return -ENXIO;
 240	if (subdevice >= 0 && subdevice >= s->substream_count)
 241		return -ENODEV;
 242
 243	list_for_each_entry(substream, &s->substreams, list) {
 244		if (substream->opened) {
 245			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 246			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 247			    !substream->append)
 248				continue;
 249		}
 250		if (subdevice < 0 || subdevice == substream->number) {
 251			*sub_ret = substream;
 252			return 0;
 253		}
 254	}
 255	return -EAGAIN;
 256}
 257
 258/* open and do ref-counting for the given substream */
 259static int open_substream(struct snd_rawmidi *rmidi,
 260			  struct snd_rawmidi_substream *substream,
 261			  int mode)
 262{
 263	int err;
 264
 265	if (substream->use_count == 0) {
 266		err = snd_rawmidi_runtime_create(substream);
 267		if (err < 0)
 268			return err;
 269		err = substream->ops->open(substream);
 270		if (err < 0) {
 271			snd_rawmidi_runtime_free(substream);
 272			return err;
 273		}
 274		substream->opened = 1;
 275		substream->active_sensing = 0;
 276		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 277			substream->append = 1;
 278		substream->pid = get_pid(task_pid(current));
 279		rmidi->streams[substream->stream].substream_opened++;
 280	}
 281	substream->use_count++;
 282	return 0;
 283}
 284
 285static void close_substream(struct snd_rawmidi *rmidi,
 286			    struct snd_rawmidi_substream *substream,
 287			    int cleanup);
 288
 289static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 290			     struct snd_rawmidi_file *rfile)
 291{
 292	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 293	int err;
 294
 295	rfile->input = rfile->output = NULL;
 296	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 297		err = assign_substream(rmidi, subdevice,
 298				       SNDRV_RAWMIDI_STREAM_INPUT,
 299				       mode, &sinput);
 300		if (err < 0)
 301			return err;
 302	}
 303	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 304		err = assign_substream(rmidi, subdevice,
 305				       SNDRV_RAWMIDI_STREAM_OUTPUT,
 306				       mode, &soutput);
 307		if (err < 0)
 308			return err;
 309	}
 310
 311	if (sinput) {
 312		err = open_substream(rmidi, sinput, mode);
 313		if (err < 0)
 314			return err;
 315	}
 316	if (soutput) {
 317		err = open_substream(rmidi, soutput, mode);
 318		if (err < 0) {
 319			if (sinput)
 320				close_substream(rmidi, sinput, 0);
 321			return err;
 322		}
 323	}
 324
 325	rfile->rmidi = rmidi;
 326	rfile->input = sinput;
 327	rfile->output = soutput;
 328	return 0;
 329}
 330
 331/* called from sound/core/seq/seq_midi.c */
 332int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 333			    int mode, struct snd_rawmidi_file * rfile)
 334{
 335	struct snd_rawmidi *rmidi;
 336	int err;
 337
 338	if (snd_BUG_ON(!rfile))
 339		return -EINVAL;
 340
 341	mutex_lock(&register_mutex);
 342	rmidi = snd_rawmidi_search(card, device);
 343	if (rmidi == NULL) {
 344		mutex_unlock(&register_mutex);
 345		return -ENODEV;
 346	}
 347	if (!try_module_get(rmidi->card->module)) {
 348		mutex_unlock(&register_mutex);
 349		return -ENXIO;
 350	}
 351	mutex_unlock(&register_mutex);
 352
 353	mutex_lock(&rmidi->open_mutex);
 354	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 355	mutex_unlock(&rmidi->open_mutex);
 356	if (err < 0)
 357		module_put(rmidi->card->module);
 358	return err;
 359}
 360EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 361
 362static int snd_rawmidi_open(struct inode *inode, struct file *file)
 363{
 364	int maj = imajor(inode);
 365	struct snd_card *card;
 366	int subdevice;
 367	unsigned short fflags;
 368	int err;
 369	struct snd_rawmidi *rmidi;
 370	struct snd_rawmidi_file *rawmidi_file = NULL;
 371	wait_queue_t wait;
 372
 373	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 
 374		return -EINVAL;		/* invalid combination */
 375
 376	err = nonseekable_open(inode, file);
 377	if (err < 0)
 378		return err;
 379
 380	if (maj == snd_major) {
 381		rmidi = snd_lookup_minor_data(iminor(inode),
 382					      SNDRV_DEVICE_TYPE_RAWMIDI);
 383#ifdef CONFIG_SND_OSSEMUL
 384	} else if (maj == SOUND_MAJOR) {
 385		rmidi = snd_lookup_oss_minor_data(iminor(inode),
 386						  SNDRV_OSS_DEVICE_TYPE_MIDI);
 387#endif
 388	} else
 389		return -ENXIO;
 390
 391	if (rmidi == NULL)
 392		return -ENODEV;
 393
 394	if (!try_module_get(rmidi->card->module)) {
 395		snd_card_unref(rmidi->card);
 396		return -ENXIO;
 397	}
 398
 399	mutex_lock(&rmidi->open_mutex);
 400	card = rmidi->card;
 401	err = snd_card_file_add(card, file);
 402	if (err < 0)
 403		goto __error_card;
 404	fflags = snd_rawmidi_file_flags(file);
 405	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 406		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 407	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 408	if (rawmidi_file == NULL) {
 409		err = -ENOMEM;
 410		goto __error;
 411	}
 412	init_waitqueue_entry(&wait, current);
 413	add_wait_queue(&rmidi->open_wait, &wait);
 414	while (1) {
 415		subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 416		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 417		if (err >= 0)
 418			break;
 419		if (err == -EAGAIN) {
 420			if (file->f_flags & O_NONBLOCK) {
 421				err = -EBUSY;
 422				break;
 423			}
 424		} else
 425			break;
 426		set_current_state(TASK_INTERRUPTIBLE);
 427		mutex_unlock(&rmidi->open_mutex);
 428		schedule();
 429		mutex_lock(&rmidi->open_mutex);
 430		if (rmidi->card->shutdown) {
 431			err = -ENODEV;
 432			break;
 433		}
 434		if (signal_pending(current)) {
 435			err = -ERESTARTSYS;
 436			break;
 437		}
 438	}
 439	remove_wait_queue(&rmidi->open_wait, &wait);
 440	if (err < 0) {
 441		kfree(rawmidi_file);
 442		goto __error;
 443	}
 444#ifdef CONFIG_SND_OSSEMUL
 445	if (rawmidi_file->input && rawmidi_file->input->runtime)
 446		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 447	if (rawmidi_file->output && rawmidi_file->output->runtime)
 448		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 449#endif
 450	file->private_data = rawmidi_file;
 451	mutex_unlock(&rmidi->open_mutex);
 452	snd_card_unref(rmidi->card);
 453	return 0;
 454
 455 __error:
 456	snd_card_file_remove(card, file);
 457 __error_card:
 458	mutex_unlock(&rmidi->open_mutex);
 459	module_put(rmidi->card->module);
 460	snd_card_unref(rmidi->card);
 461	return err;
 462}
 463
 464static void close_substream(struct snd_rawmidi *rmidi,
 465			    struct snd_rawmidi_substream *substream,
 466			    int cleanup)
 467{
 468	if (--substream->use_count)
 469		return;
 470
 471	if (cleanup) {
 472		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 473			snd_rawmidi_input_trigger(substream, 0);
 474		else {
 475			if (substream->active_sensing) {
 476				unsigned char buf = 0xfe;
 477				/* sending single active sensing message
 478				 * to shut the device up
 479				 */
 480				snd_rawmidi_kernel_write(substream, &buf, 1);
 481			}
 482			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 483				snd_rawmidi_output_trigger(substream, 0);
 484		}
 485	}
 486	substream->ops->close(substream);
 487	if (substream->runtime->private_free)
 488		substream->runtime->private_free(substream);
 489	snd_rawmidi_runtime_free(substream);
 490	substream->opened = 0;
 491	substream->append = 0;
 492	put_pid(substream->pid);
 493	substream->pid = NULL;
 494	rmidi->streams[substream->stream].substream_opened--;
 495}
 496
 497static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 498{
 499	struct snd_rawmidi *rmidi;
 500
 501	rmidi = rfile->rmidi;
 502	mutex_lock(&rmidi->open_mutex);
 503	if (rfile->input) {
 504		close_substream(rmidi, rfile->input, 1);
 505		rfile->input = NULL;
 506	}
 507	if (rfile->output) {
 508		close_substream(rmidi, rfile->output, 1);
 509		rfile->output = NULL;
 510	}
 511	rfile->rmidi = NULL;
 512	mutex_unlock(&rmidi->open_mutex);
 513	wake_up(&rmidi->open_wait);
 514}
 515
 516/* called from sound/core/seq/seq_midi.c */
 517int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 518{
 519	struct snd_rawmidi *rmidi;
 520
 521	if (snd_BUG_ON(!rfile))
 522		return -ENXIO;
 523	
 524	rmidi = rfile->rmidi;
 525	rawmidi_release_priv(rfile);
 526	module_put(rmidi->card->module);
 527	return 0;
 528}
 529EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 530
 531static int snd_rawmidi_release(struct inode *inode, struct file *file)
 532{
 533	struct snd_rawmidi_file *rfile;
 534	struct snd_rawmidi *rmidi;
 535	struct module *module;
 536
 537	rfile = file->private_data;
 538	rmidi = rfile->rmidi;
 539	rawmidi_release_priv(rfile);
 540	kfree(rfile);
 541	module = rmidi->card->module;
 542	snd_card_file_remove(rmidi->card, file);
 543	module_put(module);
 544	return 0;
 545}
 546
 547static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 548			    struct snd_rawmidi_info *info)
 549{
 550	struct snd_rawmidi *rmidi;
 551	
 552	if (substream == NULL)
 553		return -ENODEV;
 554	rmidi = substream->rmidi;
 555	memset(info, 0, sizeof(*info));
 556	info->card = rmidi->card->number;
 557	info->device = rmidi->device;
 558	info->subdevice = substream->number;
 559	info->stream = substream->stream;
 560	info->flags = rmidi->info_flags;
 561	strcpy(info->id, rmidi->id);
 562	strcpy(info->name, rmidi->name);
 563	strcpy(info->subname, substream->name);
 564	info->subdevices_count = substream->pstr->substream_count;
 565	info->subdevices_avail = (substream->pstr->substream_count -
 566				  substream->pstr->substream_opened);
 567	return 0;
 568}
 569
 570static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 571				 struct snd_rawmidi_info __user * _info)
 572{
 573	struct snd_rawmidi_info info;
 574	int err;
 575	if ((err = snd_rawmidi_info(substream, &info)) < 0)
 576		return err;
 577	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 578		return -EFAULT;
 579	return 0;
 580}
 581
 582int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 583{
 584	struct snd_rawmidi *rmidi;
 585	struct snd_rawmidi_str *pstr;
 586	struct snd_rawmidi_substream *substream;
 587
 588	mutex_lock(&register_mutex);
 589	rmidi = snd_rawmidi_search(card, info->device);
 590	mutex_unlock(&register_mutex);
 591	if (!rmidi)
 592		return -ENXIO;
 593	if (info->stream < 0 || info->stream > 1)
 594		return -EINVAL;
 595	pstr = &rmidi->streams[info->stream];
 596	if (pstr->substream_count == 0)
 597		return -ENOENT;
 598	if (info->subdevice >= pstr->substream_count)
 599		return -ENXIO;
 600	list_for_each_entry(substream, &pstr->substreams, list) {
 601		if ((unsigned int)substream->number == info->subdevice)
 602			return snd_rawmidi_info(substream, info);
 603	}
 604	return -ENXIO;
 605}
 606EXPORT_SYMBOL(snd_rawmidi_info_select);
 607
 608static int snd_rawmidi_info_select_user(struct snd_card *card,
 609					struct snd_rawmidi_info __user *_info)
 610{
 611	int err;
 612	struct snd_rawmidi_info info;
 613	if (get_user(info.device, &_info->device))
 614		return -EFAULT;
 615	if (get_user(info.stream, &_info->stream))
 616		return -EFAULT;
 617	if (get_user(info.subdevice, &_info->subdevice))
 618		return -EFAULT;
 619	if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 620		return err;
 621	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 622		return -EFAULT;
 623	return 0;
 624}
 625
 626int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 627			      struct snd_rawmidi_params * params)
 628{
 629	char *newbuf;
 630	struct snd_rawmidi_runtime *runtime = substream->runtime;
 631	
 632	if (substream->append && substream->use_count > 1)
 633		return -EBUSY;
 634	snd_rawmidi_drain_output(substream);
 635	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 636		return -EINVAL;
 637	}
 638	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 639		return -EINVAL;
 640	}
 641	if (params->buffer_size != runtime->buffer_size) {
 642		newbuf = krealloc(runtime->buffer, params->buffer_size,
 643				  GFP_KERNEL);
 644		if (!newbuf)
 645			return -ENOMEM;
 646		runtime->buffer = newbuf;
 647		runtime->buffer_size = params->buffer_size;
 648		runtime->avail = runtime->buffer_size;
 649	}
 650	runtime->avail_min = params->avail_min;
 651	substream->active_sensing = !params->no_active_sensing;
 652	return 0;
 653}
 654EXPORT_SYMBOL(snd_rawmidi_output_params);
 655
 656int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 657			     struct snd_rawmidi_params * params)
 658{
 659	char *newbuf;
 660	struct snd_rawmidi_runtime *runtime = substream->runtime;
 661
 662	snd_rawmidi_drain_input(substream);
 663	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 664		return -EINVAL;
 665	}
 666	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 667		return -EINVAL;
 668	}
 669	if (params->buffer_size != runtime->buffer_size) {
 670		newbuf = krealloc(runtime->buffer, params->buffer_size,
 671				  GFP_KERNEL);
 672		if (!newbuf)
 673			return -ENOMEM;
 674		runtime->buffer = newbuf;
 675		runtime->buffer_size = params->buffer_size;
 676	}
 677	runtime->avail_min = params->avail_min;
 678	return 0;
 679}
 680EXPORT_SYMBOL(snd_rawmidi_input_params);
 681
 682static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 683				     struct snd_rawmidi_status * status)
 684{
 685	struct snd_rawmidi_runtime *runtime = substream->runtime;
 686
 687	memset(status, 0, sizeof(*status));
 688	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 689	spin_lock_irq(&runtime->lock);
 690	status->avail = runtime->avail;
 691	spin_unlock_irq(&runtime->lock);
 692	return 0;
 693}
 694
 695static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 696				    struct snd_rawmidi_status * status)
 697{
 698	struct snd_rawmidi_runtime *runtime = substream->runtime;
 699
 700	memset(status, 0, sizeof(*status));
 701	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 702	spin_lock_irq(&runtime->lock);
 703	status->avail = runtime->avail;
 704	status->xruns = runtime->xruns;
 705	runtime->xruns = 0;
 706	spin_unlock_irq(&runtime->lock);
 707	return 0;
 708}
 709
 710static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 711{
 712	struct snd_rawmidi_file *rfile;
 713	void __user *argp = (void __user *)arg;
 714
 715	rfile = file->private_data;
 716	if (((cmd >> 8) & 0xff) != 'W')
 717		return -ENOTTY;
 718	switch (cmd) {
 719	case SNDRV_RAWMIDI_IOCTL_PVERSION:
 720		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 721	case SNDRV_RAWMIDI_IOCTL_INFO:
 722	{
 723		int stream;
 724		struct snd_rawmidi_info __user *info = argp;
 725		if (get_user(stream, &info->stream))
 726			return -EFAULT;
 727		switch (stream) {
 728		case SNDRV_RAWMIDI_STREAM_INPUT:
 729			return snd_rawmidi_info_user(rfile->input, info);
 730		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 731			return snd_rawmidi_info_user(rfile->output, info);
 732		default:
 733			return -EINVAL;
 734		}
 735	}
 736	case SNDRV_RAWMIDI_IOCTL_PARAMS:
 737	{
 738		struct snd_rawmidi_params params;
 739		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 740			return -EFAULT;
 741		switch (params.stream) {
 742		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 743			if (rfile->output == NULL)
 744				return -EINVAL;
 745			return snd_rawmidi_output_params(rfile->output, &params);
 746		case SNDRV_RAWMIDI_STREAM_INPUT:
 747			if (rfile->input == NULL)
 748				return -EINVAL;
 749			return snd_rawmidi_input_params(rfile->input, &params);
 750		default:
 751			return -EINVAL;
 752		}
 753	}
 754	case SNDRV_RAWMIDI_IOCTL_STATUS:
 755	{
 756		int err = 0;
 757		struct snd_rawmidi_status status;
 758		if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 759			return -EFAULT;
 760		switch (status.stream) {
 761		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 762			if (rfile->output == NULL)
 763				return -EINVAL;
 764			err = snd_rawmidi_output_status(rfile->output, &status);
 765			break;
 766		case SNDRV_RAWMIDI_STREAM_INPUT:
 767			if (rfile->input == NULL)
 768				return -EINVAL;
 769			err = snd_rawmidi_input_status(rfile->input, &status);
 770			break;
 771		default:
 772			return -EINVAL;
 773		}
 774		if (err < 0)
 775			return err;
 776		if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 777			return -EFAULT;
 778		return 0;
 779	}
 780	case SNDRV_RAWMIDI_IOCTL_DROP:
 781	{
 782		int val;
 783		if (get_user(val, (int __user *) argp))
 784			return -EFAULT;
 785		switch (val) {
 786		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 787			if (rfile->output == NULL)
 788				return -EINVAL;
 789			return snd_rawmidi_drop_output(rfile->output);
 790		default:
 791			return -EINVAL;
 792		}
 793	}
 794	case SNDRV_RAWMIDI_IOCTL_DRAIN:
 795	{
 796		int val;
 797		if (get_user(val, (int __user *) argp))
 798			return -EFAULT;
 799		switch (val) {
 800		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 801			if (rfile->output == NULL)
 802				return -EINVAL;
 803			return snd_rawmidi_drain_output(rfile->output);
 804		case SNDRV_RAWMIDI_STREAM_INPUT:
 805			if (rfile->input == NULL)
 806				return -EINVAL;
 807			return snd_rawmidi_drain_input(rfile->input);
 808		default:
 809			return -EINVAL;
 810		}
 811	}
 812	default:
 813		rmidi_dbg(rfile->rmidi,
 814			  "rawmidi: unknown command = 0x%x\n", cmd);
 815	}
 816	return -ENOTTY;
 817}
 818
 819static int snd_rawmidi_control_ioctl(struct snd_card *card,
 820				     struct snd_ctl_file *control,
 821				     unsigned int cmd,
 822				     unsigned long arg)
 823{
 824	void __user *argp = (void __user *)arg;
 825
 826	switch (cmd) {
 827	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 828	{
 829		int device;
 830		
 831		if (get_user(device, (int __user *)argp))
 832			return -EFAULT;
 833		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 834			device = SNDRV_RAWMIDI_DEVICES - 1;
 835		mutex_lock(&register_mutex);
 836		device = device < 0 ? 0 : device + 1;
 837		while (device < SNDRV_RAWMIDI_DEVICES) {
 838			if (snd_rawmidi_search(card, device))
 839				break;
 840			device++;
 841		}
 842		if (device == SNDRV_RAWMIDI_DEVICES)
 843			device = -1;
 844		mutex_unlock(&register_mutex);
 845		if (put_user(device, (int __user *)argp))
 846			return -EFAULT;
 847		return 0;
 848	}
 849	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 850	{
 851		int val;
 852		
 853		if (get_user(val, (int __user *)argp))
 854			return -EFAULT;
 855		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 856		return 0;
 857	}
 858	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 859		return snd_rawmidi_info_select_user(card, argp);
 860	}
 861	return -ENOIOCTLCMD;
 862}
 863
 864/**
 865 * snd_rawmidi_receive - receive the input data from the device
 866 * @substream: the rawmidi substream
 867 * @buffer: the buffer pointer
 868 * @count: the data size to read
 869 *
 870 * Reads the data from the internal buffer.
 871 *
 872 * Return: The size of read data, or a negative error code on failure.
 873 */
 874int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 875			const unsigned char *buffer, int count)
 876{
 877	unsigned long flags;
 878	int result = 0, count1;
 879	struct snd_rawmidi_runtime *runtime = substream->runtime;
 880
 881	if (!substream->opened)
 882		return -EBADFD;
 883	if (runtime->buffer == NULL) {
 884		rmidi_dbg(substream->rmidi,
 885			  "snd_rawmidi_receive: input is not active!!!\n");
 886		return -EINVAL;
 887	}
 888	spin_lock_irqsave(&runtime->lock, flags);
 889	if (count == 1) {	/* special case, faster code */
 890		substream->bytes++;
 891		if (runtime->avail < runtime->buffer_size) {
 892			runtime->buffer[runtime->hw_ptr++] = buffer[0];
 893			runtime->hw_ptr %= runtime->buffer_size;
 894			runtime->avail++;
 895			result++;
 896		} else {
 897			runtime->xruns++;
 898		}
 899	} else {
 900		substream->bytes += count;
 901		count1 = runtime->buffer_size - runtime->hw_ptr;
 902		if (count1 > count)
 903			count1 = count;
 904		if (count1 > (int)(runtime->buffer_size - runtime->avail))
 905			count1 = runtime->buffer_size - runtime->avail;
 906		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 907		runtime->hw_ptr += count1;
 908		runtime->hw_ptr %= runtime->buffer_size;
 909		runtime->avail += count1;
 910		count -= count1;
 911		result += count1;
 912		if (count > 0) {
 913			buffer += count1;
 914			count1 = count;
 915			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 916				count1 = runtime->buffer_size - runtime->avail;
 917				runtime->xruns += count - count1;
 918			}
 919			if (count1 > 0) {
 920				memcpy(runtime->buffer, buffer, count1);
 921				runtime->hw_ptr = count1;
 922				runtime->avail += count1;
 923				result += count1;
 924			}
 925		}
 926	}
 927	if (result > 0) {
 928		if (runtime->event)
 929			schedule_work(&runtime->event_work);
 930		else if (snd_rawmidi_ready(substream))
 931			wake_up(&runtime->sleep);
 932	}
 933	spin_unlock_irqrestore(&runtime->lock, flags);
 934	return result;
 935}
 936EXPORT_SYMBOL(snd_rawmidi_receive);
 937
 938static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 939				     unsigned char __user *userbuf,
 940				     unsigned char *kernelbuf, long count)
 941{
 942	unsigned long flags;
 943	long result = 0, count1;
 944	struct snd_rawmidi_runtime *runtime = substream->runtime;
 945	unsigned long appl_ptr;
 946
 947	spin_lock_irqsave(&runtime->lock, flags);
 948	while (count > 0 && runtime->avail) {
 949		count1 = runtime->buffer_size - runtime->appl_ptr;
 950		if (count1 > count)
 951			count1 = count;
 952		if (count1 > (int)runtime->avail)
 953			count1 = runtime->avail;
 954
 955		/* update runtime->appl_ptr before unlocking for userbuf */
 956		appl_ptr = runtime->appl_ptr;
 957		runtime->appl_ptr += count1;
 958		runtime->appl_ptr %= runtime->buffer_size;
 959		runtime->avail -= count1;
 960
 961		if (kernelbuf)
 962			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
 963		if (userbuf) {
 964			spin_unlock_irqrestore(&runtime->lock, flags);
 965			if (copy_to_user(userbuf + result,
 966					 runtime->buffer + appl_ptr, count1)) {
 967				return result > 0 ? result : -EFAULT;
 968			}
 969			spin_lock_irqsave(&runtime->lock, flags);
 970		}
 971		result += count1;
 972		count -= count1;
 973	}
 974	spin_unlock_irqrestore(&runtime->lock, flags);
 975	return result;
 976}
 977
 978long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 979			     unsigned char *buf, long count)
 980{
 981	snd_rawmidi_input_trigger(substream, 1);
 982	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 983}
 984EXPORT_SYMBOL(snd_rawmidi_kernel_read);
 985
 986static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 987				loff_t *offset)
 988{
 989	long result;
 990	int count1;
 991	struct snd_rawmidi_file *rfile;
 992	struct snd_rawmidi_substream *substream;
 993	struct snd_rawmidi_runtime *runtime;
 994
 995	rfile = file->private_data;
 996	substream = rfile->input;
 997	if (substream == NULL)
 998		return -EIO;
 999	runtime = substream->runtime;
1000	snd_rawmidi_input_trigger(substream, 1);
1001	result = 0;
1002	while (count > 0) {
1003		spin_lock_irq(&runtime->lock);
1004		while (!snd_rawmidi_ready(substream)) {
1005			wait_queue_t wait;
1006			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1007				spin_unlock_irq(&runtime->lock);
1008				return result > 0 ? result : -EAGAIN;
1009			}
1010			init_waitqueue_entry(&wait, current);
1011			add_wait_queue(&runtime->sleep, &wait);
1012			set_current_state(TASK_INTERRUPTIBLE);
1013			spin_unlock_irq(&runtime->lock);
1014			schedule();
1015			remove_wait_queue(&runtime->sleep, &wait);
1016			if (rfile->rmidi->card->shutdown)
1017				return -ENODEV;
1018			if (signal_pending(current))
1019				return result > 0 ? result : -ERESTARTSYS;
1020			if (!runtime->avail)
1021				return result > 0 ? result : -EIO;
1022			spin_lock_irq(&runtime->lock);
1023		}
1024		spin_unlock_irq(&runtime->lock);
1025		count1 = snd_rawmidi_kernel_read1(substream,
1026						  (unsigned char __user *)buf,
1027						  NULL/*kernelbuf*/,
1028						  count);
1029		if (count1 < 0)
1030			return result > 0 ? result : count1;
1031		result += count1;
1032		buf += count1;
1033		count -= count1;
1034	}
1035	return result;
1036}
1037
1038/**
1039 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1040 * @substream: the rawmidi substream
1041 *
1042 * Return: 1 if the internal output buffer is empty, 0 if not.
1043 */
1044int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1045{
1046	struct snd_rawmidi_runtime *runtime = substream->runtime;
1047	int result;
1048	unsigned long flags;
1049
1050	if (runtime->buffer == NULL) {
1051		rmidi_dbg(substream->rmidi,
1052			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1053		return 1;
1054	}
1055	spin_lock_irqsave(&runtime->lock, flags);
1056	result = runtime->avail >= runtime->buffer_size;
1057	spin_unlock_irqrestore(&runtime->lock, flags);
1058	return result;		
1059}
1060EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1061
1062/**
1063 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1064 * @substream: the rawmidi substream
1065 * @buffer: the buffer pointer
1066 * @count: data size to transfer
1067 *
1068 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1069 */
1070int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071			      unsigned char *buffer, int count)
1072{
1073	int result, count1;
1074	struct snd_rawmidi_runtime *runtime = substream->runtime;
1075
1076	if (runtime->buffer == NULL) {
1077		rmidi_dbg(substream->rmidi,
1078			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1079		return -EINVAL;
1080	}
1081	result = 0;
1082	if (runtime->avail >= runtime->buffer_size) {
1083		/* warning: lowlevel layer MUST trigger down the hardware */
1084		goto __skip;
1085	}
1086	if (count == 1) {	/* special case, faster code */
1087		*buffer = runtime->buffer[runtime->hw_ptr];
1088		result++;
1089	} else {
1090		count1 = runtime->buffer_size - runtime->hw_ptr;
1091		if (count1 > count)
1092			count1 = count;
1093		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1094			count1 = runtime->buffer_size - runtime->avail;
1095		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1096		count -= count1;
1097		result += count1;
1098		if (count > 0) {
1099			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1100				count = runtime->buffer_size - runtime->avail - count1;
1101			memcpy(buffer + count1, runtime->buffer, count);
1102			result += count;
1103		}
1104	}
1105      __skip:
1106	return result;
1107}
1108EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1109
1110/**
1111 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1112 * @substream: the rawmidi substream
1113 * @buffer: the buffer pointer
1114 * @count: data size to transfer
1115 *
1116 * Copies data from the internal output buffer to the given buffer.
1117 *
1118 * Call this in the interrupt handler when the midi output is ready,
1119 * and call snd_rawmidi_transmit_ack() after the transmission is
1120 * finished.
1121 *
1122 * Return: The size of copied data, or a negative error code on failure.
1123 */
1124int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1125			      unsigned char *buffer, int count)
1126{
1127	struct snd_rawmidi_runtime *runtime = substream->runtime;
1128	int result;
1129	unsigned long flags;
1130
1131	spin_lock_irqsave(&runtime->lock, flags);
1132	result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1133	spin_unlock_irqrestore(&runtime->lock, flags);
1134	return result;
1135}
1136EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1137
1138/**
1139 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1140 * @substream: the rawmidi substream
1141 * @count: the transferred count
1142 *
1143 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1144 */
1145int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1146{
1147	struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149	if (runtime->buffer == NULL) {
1150		rmidi_dbg(substream->rmidi,
1151			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1152		return -EINVAL;
1153	}
1154	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1155	runtime->hw_ptr += count;
1156	runtime->hw_ptr %= runtime->buffer_size;
1157	runtime->avail += count;
1158	substream->bytes += count;
1159	if (count > 0) {
1160		if (runtime->drain || snd_rawmidi_ready(substream))
1161			wake_up(&runtime->sleep);
1162	}
1163	return count;
1164}
1165EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1166
1167/**
1168 * snd_rawmidi_transmit_ack - acknowledge the transmission
1169 * @substream: the rawmidi substream
1170 * @count: the transferred count
1171 *
1172 * Advances the hardware pointer for the internal output buffer with
1173 * the given size and updates the condition.
1174 * Call after the transmission is finished.
1175 *
1176 * Return: The advanced size if successful, or a negative error code on failure.
1177 */
1178int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1179{
1180	struct snd_rawmidi_runtime *runtime = substream->runtime;
1181	int result;
1182	unsigned long flags;
1183
1184	spin_lock_irqsave(&runtime->lock, flags);
1185	result = __snd_rawmidi_transmit_ack(substream, count);
1186	spin_unlock_irqrestore(&runtime->lock, flags);
1187	return result;
1188}
1189EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1190
1191/**
1192 * snd_rawmidi_transmit - copy from the buffer to the device
1193 * @substream: the rawmidi substream
1194 * @buffer: the buffer pointer
1195 * @count: the data size to transfer
1196 * 
1197 * Copies data from the buffer to the device and advances the pointer.
1198 *
1199 * Return: The copied size if successful, or a negative error code on failure.
1200 */
1201int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1202			 unsigned char *buffer, int count)
1203{
1204	struct snd_rawmidi_runtime *runtime = substream->runtime;
1205	int result;
1206	unsigned long flags;
1207
1208	spin_lock_irqsave(&runtime->lock, flags);
1209	if (!substream->opened)
1210		result = -EBADFD;
1211	else {
1212		count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1213		if (count <= 0)
1214			result = count;
1215		else
1216			result = __snd_rawmidi_transmit_ack(substream, count);
1217	}
1218	spin_unlock_irqrestore(&runtime->lock, flags);
1219	return result;
1220}
1221EXPORT_SYMBOL(snd_rawmidi_transmit);
1222
1223static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1224				      const unsigned char __user *userbuf,
1225				      const unsigned char *kernelbuf,
1226				      long count)
1227{
1228	unsigned long flags;
1229	long count1, result;
1230	struct snd_rawmidi_runtime *runtime = substream->runtime;
1231	unsigned long appl_ptr;
1232
1233	if (!kernelbuf && !userbuf)
1234		return -EINVAL;
1235	if (snd_BUG_ON(!runtime->buffer))
1236		return -EINVAL;
1237
1238	result = 0;
1239	spin_lock_irqsave(&runtime->lock, flags);
1240	if (substream->append) {
1241		if ((long)runtime->avail < count) {
1242			spin_unlock_irqrestore(&runtime->lock, flags);
1243			return -EAGAIN;
1244		}
1245	}
1246	while (count > 0 && runtime->avail > 0) {
1247		count1 = runtime->buffer_size - runtime->appl_ptr;
1248		if (count1 > count)
1249			count1 = count;
1250		if (count1 > (long)runtime->avail)
1251			count1 = runtime->avail;
1252
1253		/* update runtime->appl_ptr before unlocking for userbuf */
1254		appl_ptr = runtime->appl_ptr;
1255		runtime->appl_ptr += count1;
1256		runtime->appl_ptr %= runtime->buffer_size;
1257		runtime->avail -= count1;
1258
1259		if (kernelbuf)
1260			memcpy(runtime->buffer + appl_ptr,
1261			       kernelbuf + result, count1);
1262		else if (userbuf) {
1263			spin_unlock_irqrestore(&runtime->lock, flags);
1264			if (copy_from_user(runtime->buffer + appl_ptr,
1265					   userbuf + result, count1)) {
1266				spin_lock_irqsave(&runtime->lock, flags);
1267				result = result > 0 ? result : -EFAULT;
1268				goto __end;
1269			}
1270			spin_lock_irqsave(&runtime->lock, flags);
1271		}
1272		result += count1;
1273		count -= count1;
1274	}
1275      __end:
1276	count1 = runtime->avail < runtime->buffer_size;
1277	spin_unlock_irqrestore(&runtime->lock, flags);
1278	if (count1)
1279		snd_rawmidi_output_trigger(substream, 1);
1280	return result;
1281}
1282
1283long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1284			      const unsigned char *buf, long count)
1285{
1286	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1287}
1288EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1289
1290static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1291				 size_t count, loff_t *offset)
1292{
1293	long result, timeout;
1294	int count1;
1295	struct snd_rawmidi_file *rfile;
1296	struct snd_rawmidi_runtime *runtime;
1297	struct snd_rawmidi_substream *substream;
1298
1299	rfile = file->private_data;
1300	substream = rfile->output;
1301	runtime = substream->runtime;
1302	/* we cannot put an atomic message to our buffer */
1303	if (substream->append && count > runtime->buffer_size)
1304		return -EIO;
1305	result = 0;
1306	while (count > 0) {
1307		spin_lock_irq(&runtime->lock);
1308		while (!snd_rawmidi_ready_append(substream, count)) {
1309			wait_queue_t wait;
1310			if (file->f_flags & O_NONBLOCK) {
1311				spin_unlock_irq(&runtime->lock);
1312				return result > 0 ? result : -EAGAIN;
1313			}
1314			init_waitqueue_entry(&wait, current);
1315			add_wait_queue(&runtime->sleep, &wait);
1316			set_current_state(TASK_INTERRUPTIBLE);
1317			spin_unlock_irq(&runtime->lock);
1318			timeout = schedule_timeout(30 * HZ);
1319			remove_wait_queue(&runtime->sleep, &wait);
1320			if (rfile->rmidi->card->shutdown)
1321				return -ENODEV;
1322			if (signal_pending(current))
1323				return result > 0 ? result : -ERESTARTSYS;
1324			if (!runtime->avail && !timeout)
1325				return result > 0 ? result : -EIO;
1326			spin_lock_irq(&runtime->lock);
1327		}
1328		spin_unlock_irq(&runtime->lock);
1329		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1330		if (count1 < 0)
1331			return result > 0 ? result : count1;
1332		result += count1;
1333		buf += count1;
1334		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1335			break;
1336		count -= count1;
1337	}
1338	if (file->f_flags & O_DSYNC) {
1339		spin_lock_irq(&runtime->lock);
1340		while (runtime->avail != runtime->buffer_size) {
1341			wait_queue_t wait;
1342			unsigned int last_avail = runtime->avail;
1343			init_waitqueue_entry(&wait, current);
1344			add_wait_queue(&runtime->sleep, &wait);
1345			set_current_state(TASK_INTERRUPTIBLE);
1346			spin_unlock_irq(&runtime->lock);
1347			timeout = schedule_timeout(30 * HZ);
1348			remove_wait_queue(&runtime->sleep, &wait);
1349			if (signal_pending(current))
1350				return result > 0 ? result : -ERESTARTSYS;
1351			if (runtime->avail == last_avail && !timeout)
1352				return result > 0 ? result : -EIO;
1353			spin_lock_irq(&runtime->lock);
1354		}
1355		spin_unlock_irq(&runtime->lock);
1356	}
1357	return result;
1358}
1359
1360static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1361{
1362	struct snd_rawmidi_file *rfile;
1363	struct snd_rawmidi_runtime *runtime;
1364	unsigned int mask;
1365
1366	rfile = file->private_data;
1367	if (rfile->input != NULL) {
1368		runtime = rfile->input->runtime;
1369		snd_rawmidi_input_trigger(rfile->input, 1);
1370		poll_wait(file, &runtime->sleep, wait);
1371	}
1372	if (rfile->output != NULL) {
1373		runtime = rfile->output->runtime;
1374		poll_wait(file, &runtime->sleep, wait);
1375	}
1376	mask = 0;
1377	if (rfile->input != NULL) {
1378		if (snd_rawmidi_ready(rfile->input))
1379			mask |= POLLIN | POLLRDNORM;
1380	}
1381	if (rfile->output != NULL) {
1382		if (snd_rawmidi_ready(rfile->output))
1383			mask |= POLLOUT | POLLWRNORM;
1384	}
1385	return mask;
1386}
1387
1388/*
1389 */
1390#ifdef CONFIG_COMPAT
1391#include "rawmidi_compat.c"
1392#else
1393#define snd_rawmidi_ioctl_compat	NULL
1394#endif
1395
1396/*
1397
1398 */
1399
1400static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1401				       struct snd_info_buffer *buffer)
1402{
1403	struct snd_rawmidi *rmidi;
1404	struct snd_rawmidi_substream *substream;
1405	struct snd_rawmidi_runtime *runtime;
1406
1407	rmidi = entry->private_data;
1408	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1409	mutex_lock(&rmidi->open_mutex);
1410	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1411		list_for_each_entry(substream,
1412				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1413				    list) {
1414			snd_iprintf(buffer,
1415				    "Output %d\n"
1416				    "  Tx bytes     : %lu\n",
1417				    substream->number,
1418				    (unsigned long) substream->bytes);
1419			if (substream->opened) {
1420				snd_iprintf(buffer,
1421				    "  Owner PID    : %d\n",
1422				    pid_vnr(substream->pid));
1423				runtime = substream->runtime;
1424				snd_iprintf(buffer,
1425				    "  Mode         : %s\n"
1426				    "  Buffer size  : %lu\n"
1427				    "  Avail        : %lu\n",
1428				    runtime->oss ? "OSS compatible" : "native",
1429				    (unsigned long) runtime->buffer_size,
1430				    (unsigned long) runtime->avail);
1431			}
1432		}
1433	}
1434	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1435		list_for_each_entry(substream,
1436				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1437				    list) {
1438			snd_iprintf(buffer,
1439				    "Input %d\n"
1440				    "  Rx bytes     : %lu\n",
1441				    substream->number,
1442				    (unsigned long) substream->bytes);
1443			if (substream->opened) {
1444				snd_iprintf(buffer,
1445					    "  Owner PID    : %d\n",
1446					    pid_vnr(substream->pid));
1447				runtime = substream->runtime;
1448				snd_iprintf(buffer,
1449					    "  Buffer size  : %lu\n"
1450					    "  Avail        : %lu\n"
1451					    "  Overruns     : %lu\n",
1452					    (unsigned long) runtime->buffer_size,
1453					    (unsigned long) runtime->avail,
1454					    (unsigned long) runtime->xruns);
1455			}
1456		}
1457	}
1458	mutex_unlock(&rmidi->open_mutex);
1459}
1460
1461/*
1462 *  Register functions
1463 */
1464
1465static const struct file_operations snd_rawmidi_f_ops =
1466{
1467	.owner =	THIS_MODULE,
1468	.read =		snd_rawmidi_read,
1469	.write =	snd_rawmidi_write,
1470	.open =		snd_rawmidi_open,
1471	.release =	snd_rawmidi_release,
1472	.llseek =	no_llseek,
1473	.poll =		snd_rawmidi_poll,
1474	.unlocked_ioctl =	snd_rawmidi_ioctl,
1475	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1476};
1477
1478static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1479					struct snd_rawmidi_str *stream,
1480					int direction,
1481					int count)
1482{
1483	struct snd_rawmidi_substream *substream;
1484	int idx;
1485
1486	for (idx = 0; idx < count; idx++) {
1487		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1488		if (!substream)
1489			return -ENOMEM;
1490		substream->stream = direction;
1491		substream->number = idx;
1492		substream->rmidi = rmidi;
1493		substream->pstr = stream;
1494		list_add_tail(&substream->list, &stream->substreams);
1495		stream->substream_count++;
1496	}
1497	return 0;
1498}
1499
1500static void release_rawmidi_device(struct device *dev)
1501{
1502	kfree(container_of(dev, struct snd_rawmidi, dev));
1503}
1504
1505/**
1506 * snd_rawmidi_new - create a rawmidi instance
1507 * @card: the card instance
1508 * @id: the id string
1509 * @device: the device index
1510 * @output_count: the number of output streams
1511 * @input_count: the number of input streams
1512 * @rrawmidi: the pointer to store the new rawmidi instance
1513 *
1514 * Creates a new rawmidi instance.
1515 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1516 *
1517 * Return: Zero if successful, or a negative error code on failure.
1518 */
1519int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1520		    int output_count, int input_count,
1521		    struct snd_rawmidi ** rrawmidi)
1522{
1523	struct snd_rawmidi *rmidi;
1524	int err;
1525	static struct snd_device_ops ops = {
1526		.dev_free = snd_rawmidi_dev_free,
1527		.dev_register = snd_rawmidi_dev_register,
1528		.dev_disconnect = snd_rawmidi_dev_disconnect,
1529	};
1530
1531	if (snd_BUG_ON(!card))
1532		return -ENXIO;
1533	if (rrawmidi)
1534		*rrawmidi = NULL;
1535	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1536	if (!rmidi)
1537		return -ENOMEM;
1538	rmidi->card = card;
1539	rmidi->device = device;
1540	mutex_init(&rmidi->open_mutex);
1541	init_waitqueue_head(&rmidi->open_wait);
1542	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1543	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1544
1545	if (id != NULL)
1546		strlcpy(rmidi->id, id, sizeof(rmidi->id));
1547
1548	snd_device_initialize(&rmidi->dev, card);
1549	rmidi->dev.release = release_rawmidi_device;
1550	dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1551
1552	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1553						&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1554						SNDRV_RAWMIDI_STREAM_INPUT,
1555						input_count)) < 0) {
1556		snd_rawmidi_free(rmidi);
1557		return err;
1558	}
1559	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1560						&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1561						SNDRV_RAWMIDI_STREAM_OUTPUT,
1562						output_count)) < 0) {
1563		snd_rawmidi_free(rmidi);
1564		return err;
1565	}
1566	if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1567		snd_rawmidi_free(rmidi);
1568		return err;
1569	}
1570	if (rrawmidi)
1571		*rrawmidi = rmidi;
1572	return 0;
1573}
1574EXPORT_SYMBOL(snd_rawmidi_new);
1575
1576static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1577{
1578	struct snd_rawmidi_substream *substream;
1579
1580	while (!list_empty(&stream->substreams)) {
1581		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1582		list_del(&substream->list);
1583		kfree(substream);
1584	}
1585}
1586
1587static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1588{
1589	if (!rmidi)
1590		return 0;
1591
1592	snd_info_free_entry(rmidi->proc_entry);
1593	rmidi->proc_entry = NULL;
1594	mutex_lock(&register_mutex);
1595	if (rmidi->ops && rmidi->ops->dev_unregister)
1596		rmidi->ops->dev_unregister(rmidi);
1597	mutex_unlock(&register_mutex);
1598
1599	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1600	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1601	if (rmidi->private_free)
1602		rmidi->private_free(rmidi);
1603	put_device(&rmidi->dev);
1604	return 0;
1605}
1606
1607static int snd_rawmidi_dev_free(struct snd_device *device)
1608{
1609	struct snd_rawmidi *rmidi = device->device_data;
1610	return snd_rawmidi_free(rmidi);
1611}
1612
1613#if IS_REACHABLE(CONFIG_SND_SEQUENCER)
1614static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1615{
1616	struct snd_rawmidi *rmidi = device->private_data;
1617	rmidi->seq_dev = NULL;
1618}
1619#endif
1620
1621static int snd_rawmidi_dev_register(struct snd_device *device)
1622{
1623	int err;
1624	struct snd_info_entry *entry;
1625	char name[16];
1626	struct snd_rawmidi *rmidi = device->device_data;
1627
1628	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1629		return -ENOMEM;
1630	mutex_lock(&register_mutex);
1631	if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1632		mutex_unlock(&register_mutex);
1633		return -EBUSY;
1634	}
1635	list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1636	mutex_unlock(&register_mutex);
1637	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1638				  rmidi->card, rmidi->device,
1639				  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1640	if (err < 0) {
1641		rmidi_err(rmidi, "unable to register\n");
1642		mutex_lock(&register_mutex);
1643		list_del(&rmidi->list);
1644		mutex_unlock(&register_mutex);
1645		return err;
1646	}
1647	if (rmidi->ops && rmidi->ops->dev_register &&
1648	    (err = rmidi->ops->dev_register(rmidi)) < 0) {
1649		snd_unregister_device(&rmidi->dev);
1650		mutex_lock(&register_mutex);
1651		list_del(&rmidi->list);
1652		mutex_unlock(&register_mutex);
1653		return err;
1654	}
1655#ifdef CONFIG_SND_OSSEMUL
1656	rmidi->ossreg = 0;
1657	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1658		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1659					    rmidi->card, 0, &snd_rawmidi_f_ops,
1660					    rmidi) < 0) {
1661			rmidi_err(rmidi,
1662				  "unable to register OSS rawmidi device %i:%i\n",
1663				  rmidi->card->number, 0);
1664		} else {
1665			rmidi->ossreg++;
1666#ifdef SNDRV_OSS_INFO_DEV_MIDI
1667			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1668#endif
1669		}
1670	}
1671	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1672		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1673					    rmidi->card, 1, &snd_rawmidi_f_ops,
1674					    rmidi) < 0) {
1675			rmidi_err(rmidi,
1676				  "unable to register OSS rawmidi device %i:%i\n",
1677				  rmidi->card->number, 1);
1678		} else {
1679			rmidi->ossreg++;
1680		}
1681	}
1682#endif /* CONFIG_SND_OSSEMUL */
 
1683	sprintf(name, "midi%d", rmidi->device);
1684	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1685	if (entry) {
1686		entry->private_data = rmidi;
1687		entry->c.text.read = snd_rawmidi_proc_info_read;
1688		if (snd_info_register(entry) < 0) {
1689			snd_info_free_entry(entry);
1690			entry = NULL;
1691		}
1692	}
1693	rmidi->proc_entry = entry;
1694#if IS_REACHABLE(CONFIG_SND_SEQUENCER)
1695	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1696		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1697			rmidi->seq_dev->private_data = rmidi;
1698			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1699			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1700			snd_device_register(rmidi->card, rmidi->seq_dev);
1701		}
1702	}
1703#endif
1704	return 0;
1705}
1706
1707static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1708{
1709	struct snd_rawmidi *rmidi = device->device_data;
1710	int dir;
1711
1712	mutex_lock(&register_mutex);
1713	mutex_lock(&rmidi->open_mutex);
1714	wake_up(&rmidi->open_wait);
1715	list_del_init(&rmidi->list);
1716	for (dir = 0; dir < 2; dir++) {
1717		struct snd_rawmidi_substream *s;
1718		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1719			if (s->runtime)
1720				wake_up(&s->runtime->sleep);
1721		}
1722	}
1723
1724#ifdef CONFIG_SND_OSSEMUL
1725	if (rmidi->ossreg) {
1726		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1727			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1728#ifdef SNDRV_OSS_INFO_DEV_MIDI
1729			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1730#endif
1731		}
1732		if ((int)rmidi->device == amidi_map[rmidi->card->number])
1733			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1734		rmidi->ossreg = 0;
1735	}
1736#endif /* CONFIG_SND_OSSEMUL */
1737	snd_unregister_device(&rmidi->dev);
1738	mutex_unlock(&rmidi->open_mutex);
1739	mutex_unlock(&register_mutex);
1740	return 0;
1741}
1742
1743/**
1744 * snd_rawmidi_set_ops - set the rawmidi operators
1745 * @rmidi: the rawmidi instance
1746 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1747 * @ops: the operator table
1748 *
1749 * Sets the rawmidi operators for the given stream direction.
1750 */
1751void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1752			 struct snd_rawmidi_ops *ops)
1753{
1754	struct snd_rawmidi_substream *substream;
1755	
1756	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1757		substream->ops = ops;
1758}
1759EXPORT_SYMBOL(snd_rawmidi_set_ops);
1760
1761/*
1762 *  ENTRY functions
1763 */
1764
1765static int __init alsa_rawmidi_init(void)
1766{
1767
1768	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1769	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1770#ifdef CONFIG_SND_OSSEMUL
1771	{ int i;
1772	/* check device map table */
1773	for (i = 0; i < SNDRV_CARDS; i++) {
1774		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1775			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1776			       i, midi_map[i]);
1777			midi_map[i] = 0;
1778		}
1779		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1780			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1781			       i, amidi_map[i]);
1782			amidi_map[i] = 1;
1783		}
1784	}
1785	}
1786#endif /* CONFIG_SND_OSSEMUL */
1787	return 0;
1788}
1789
1790static void __exit alsa_rawmidi_exit(void)
1791{
1792	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1793	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1794}
1795
1796module_init(alsa_rawmidi_init)
1797module_exit(alsa_rawmidi_exit)