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/signal.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_entry_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
 582static int __snd_rawmidi_info_select(struct snd_card *card,
 583				     struct snd_rawmidi_info *info)
 584{
 585	struct snd_rawmidi *rmidi;
 586	struct snd_rawmidi_str *pstr;
 587	struct snd_rawmidi_substream *substream;
 588
 589	rmidi = snd_rawmidi_search(card, info->device);
 590	if (!rmidi)
 591		return -ENXIO;
 592	if (info->stream < 0 || info->stream > 1)
 593		return -EINVAL;
 
 594	pstr = &rmidi->streams[info->stream];
 595	if (pstr->substream_count == 0)
 596		return -ENOENT;
 597	if (info->subdevice >= pstr->substream_count)
 598		return -ENXIO;
 599	list_for_each_entry(substream, &pstr->substreams, list) {
 600		if ((unsigned int)substream->number == info->subdevice)
 601			return snd_rawmidi_info(substream, info);
 602	}
 603	return -ENXIO;
 604}
 605
 606int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 607{
 608	int ret;
 609
 610	mutex_lock(&register_mutex);
 611	ret = __snd_rawmidi_info_select(card, info);
 612	mutex_unlock(&register_mutex);
 613	return ret;
 614}
 615EXPORT_SYMBOL(snd_rawmidi_info_select);
 616
 617static int snd_rawmidi_info_select_user(struct snd_card *card,
 618					struct snd_rawmidi_info __user *_info)
 619{
 620	int err;
 621	struct snd_rawmidi_info info;
 
 622	if (get_user(info.device, &_info->device))
 623		return -EFAULT;
 624	if (get_user(info.stream, &_info->stream))
 625		return -EFAULT;
 626	if (get_user(info.subdevice, &_info->subdevice))
 627		return -EFAULT;
 628	if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 
 629		return err;
 630	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 631		return -EFAULT;
 632	return 0;
 633}
 634
 635int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 636			      struct snd_rawmidi_params * params)
 
 637{
 638	char *newbuf;
 639	struct snd_rawmidi_runtime *runtime = substream->runtime;
 640	
 641	if (substream->append && substream->use_count > 1)
 642		return -EBUSY;
 643	snd_rawmidi_drain_output(substream);
 644	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 645		return -EINVAL;
 646	}
 647	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 
 648		return -EINVAL;
 649	}
 650	if (params->buffer_size != runtime->buffer_size) {
 651		newbuf = krealloc(runtime->buffer, params->buffer_size,
 652				  GFP_KERNEL);
 653		if (!newbuf)
 654			return -ENOMEM;
 
 
 
 
 
 
 
 655		runtime->buffer = newbuf;
 656		runtime->buffer_size = params->buffer_size;
 657		runtime->avail = runtime->buffer_size;
 
 
 658	}
 659	runtime->avail_min = params->avail_min;
 660	substream->active_sensing = !params->no_active_sensing;
 661	return 0;
 662}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 663EXPORT_SYMBOL(snd_rawmidi_output_params);
 664
 665int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 666			     struct snd_rawmidi_params * params)
 667{
 668	char *newbuf;
 669	struct snd_rawmidi_runtime *runtime = substream->runtime;
 
 670
 671	snd_rawmidi_drain_input(substream);
 672	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 673		return -EINVAL;
 674	}
 675	if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 676		return -EINVAL;
 677	}
 678	if (params->buffer_size != runtime->buffer_size) {
 679		newbuf = krealloc(runtime->buffer, params->buffer_size,
 680				  GFP_KERNEL);
 681		if (!newbuf)
 682			return -ENOMEM;
 683		runtime->buffer = newbuf;
 684		runtime->buffer_size = params->buffer_size;
 685	}
 686	runtime->avail_min = params->avail_min;
 687	return 0;
 688}
 689EXPORT_SYMBOL(snd_rawmidi_input_params);
 690
 691static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 692				     struct snd_rawmidi_status * status)
 693{
 694	struct snd_rawmidi_runtime *runtime = substream->runtime;
 695
 696	memset(status, 0, sizeof(*status));
 697	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 698	spin_lock_irq(&runtime->lock);
 699	status->avail = runtime->avail;
 700	spin_unlock_irq(&runtime->lock);
 701	return 0;
 702}
 703
 704static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 705				    struct snd_rawmidi_status * status)
 706{
 707	struct snd_rawmidi_runtime *runtime = substream->runtime;
 708
 709	memset(status, 0, sizeof(*status));
 710	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 711	spin_lock_irq(&runtime->lock);
 712	status->avail = runtime->avail;
 713	status->xruns = runtime->xruns;
 714	runtime->xruns = 0;
 715	spin_unlock_irq(&runtime->lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 716	return 0;
 717}
 718
 719static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 720{
 721	struct snd_rawmidi_file *rfile;
 722	void __user *argp = (void __user *)arg;
 723
 724	rfile = file->private_data;
 725	if (((cmd >> 8) & 0xff) != 'W')
 726		return -ENOTTY;
 727	switch (cmd) {
 728	case SNDRV_RAWMIDI_IOCTL_PVERSION:
 729		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 730	case SNDRV_RAWMIDI_IOCTL_INFO:
 731	{
 732		int stream;
 733		struct snd_rawmidi_info __user *info = argp;
 
 734		if (get_user(stream, &info->stream))
 735			return -EFAULT;
 736		switch (stream) {
 737		case SNDRV_RAWMIDI_STREAM_INPUT:
 738			return snd_rawmidi_info_user(rfile->input, info);
 739		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 740			return snd_rawmidi_info_user(rfile->output, info);
 741		default:
 742			return -EINVAL;
 743		}
 744	}
 
 
 
 
 
 745	case SNDRV_RAWMIDI_IOCTL_PARAMS:
 746	{
 747		struct snd_rawmidi_params params;
 
 748		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 749			return -EFAULT;
 
 
 
 
 750		switch (params.stream) {
 751		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 752			if (rfile->output == NULL)
 753				return -EINVAL;
 754			return snd_rawmidi_output_params(rfile->output, &params);
 755		case SNDRV_RAWMIDI_STREAM_INPUT:
 756			if (rfile->input == NULL)
 757				return -EINVAL;
 758			return snd_rawmidi_input_params(rfile->input, &params);
 759		default:
 760			return -EINVAL;
 761		}
 762	}
 763	case SNDRV_RAWMIDI_IOCTL_STATUS:
 764	{
 765		int err = 0;
 766		struct snd_rawmidi_status status;
 767		if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 768			return -EFAULT;
 769		switch (status.stream) {
 770		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 771			if (rfile->output == NULL)
 772				return -EINVAL;
 773			err = snd_rawmidi_output_status(rfile->output, &status);
 774			break;
 775		case SNDRV_RAWMIDI_STREAM_INPUT:
 776			if (rfile->input == NULL)
 777				return -EINVAL;
 778			err = snd_rawmidi_input_status(rfile->input, &status);
 779			break;
 780		default:
 781			return -EINVAL;
 782		}
 783		if (err < 0)
 784			return err;
 785		if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 786			return -EFAULT;
 787		return 0;
 788	}
 789	case SNDRV_RAWMIDI_IOCTL_DROP:
 790	{
 791		int val;
 
 792		if (get_user(val, (int __user *) argp))
 793			return -EFAULT;
 794		switch (val) {
 795		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 796			if (rfile->output == NULL)
 797				return -EINVAL;
 798			return snd_rawmidi_drop_output(rfile->output);
 799		default:
 800			return -EINVAL;
 801		}
 802	}
 803	case SNDRV_RAWMIDI_IOCTL_DRAIN:
 804	{
 805		int val;
 
 806		if (get_user(val, (int __user *) argp))
 807			return -EFAULT;
 808		switch (val) {
 809		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 810			if (rfile->output == NULL)
 811				return -EINVAL;
 812			return snd_rawmidi_drain_output(rfile->output);
 813		case SNDRV_RAWMIDI_STREAM_INPUT:
 814			if (rfile->input == NULL)
 815				return -EINVAL;
 816			return snd_rawmidi_drain_input(rfile->input);
 817		default:
 818			return -EINVAL;
 819		}
 820	}
 821	default:
 822		rmidi_dbg(rfile->rmidi,
 823			  "rawmidi: unknown command = 0x%x\n", cmd);
 824	}
 825	return -ENOTTY;
 826}
 827
 828static int snd_rawmidi_control_ioctl(struct snd_card *card,
 829				     struct snd_ctl_file *control,
 830				     unsigned int cmd,
 831				     unsigned long arg)
 832{
 833	void __user *argp = (void __user *)arg;
 834
 835	switch (cmd) {
 836	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 837	{
 838		int device;
 839		
 840		if (get_user(device, (int __user *)argp))
 841			return -EFAULT;
 842		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 843			device = SNDRV_RAWMIDI_DEVICES - 1;
 844		mutex_lock(&register_mutex);
 845		device = device < 0 ? 0 : device + 1;
 846		while (device < SNDRV_RAWMIDI_DEVICES) {
 847			if (snd_rawmidi_search(card, device))
 848				break;
 849			device++;
 850		}
 851		if (device == SNDRV_RAWMIDI_DEVICES)
 852			device = -1;
 853		mutex_unlock(&register_mutex);
 854		if (put_user(device, (int __user *)argp))
 855			return -EFAULT;
 856		return 0;
 857	}
 858	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 859	{
 860		int val;
 861		
 862		if (get_user(val, (int __user *)argp))
 863			return -EFAULT;
 864		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 865		return 0;
 866	}
 867	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 868		return snd_rawmidi_info_select_user(card, argp);
 869	}
 870	return -ENOIOCTLCMD;
 871}
 872
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 873/**
 874 * snd_rawmidi_receive - receive the input data from the device
 875 * @substream: the rawmidi substream
 876 * @buffer: the buffer pointer
 877 * @count: the data size to read
 878 *
 879 * Reads the data from the internal buffer.
 880 *
 881 * Return: The size of read data, or a negative error code on failure.
 882 */
 883int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 884			const unsigned char *buffer, int count)
 885{
 886	unsigned long flags;
 
 887	int result = 0, count1;
 888	struct snd_rawmidi_runtime *runtime = substream->runtime;
 889
 890	if (!substream->opened)
 891		return -EBADFD;
 892	if (runtime->buffer == NULL) {
 
 
 
 
 893		rmidi_dbg(substream->rmidi,
 894			  "snd_rawmidi_receive: input is not active!!!\n");
 895		return -EINVAL;
 
 896	}
 897	spin_lock_irqsave(&runtime->lock, flags);
 898	if (count == 1) {	/* special case, faster code */
 
 
 899		substream->bytes++;
 900		if (runtime->avail < runtime->buffer_size) {
 901			runtime->buffer[runtime->hw_ptr++] = buffer[0];
 902			runtime->hw_ptr %= runtime->buffer_size;
 903			runtime->avail++;
 904			result++;
 905		} else {
 906			runtime->xruns++;
 907		}
 908	} else {
 909		substream->bytes += count;
 910		count1 = runtime->buffer_size - runtime->hw_ptr;
 911		if (count1 > count)
 912			count1 = count;
 913		if (count1 > (int)(runtime->buffer_size - runtime->avail))
 914			count1 = runtime->buffer_size - runtime->avail;
 915		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 916		runtime->hw_ptr += count1;
 917		runtime->hw_ptr %= runtime->buffer_size;
 918		runtime->avail += count1;
 919		count -= count1;
 920		result += count1;
 921		if (count > 0) {
 922			buffer += count1;
 923			count1 = count;
 924			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 925				count1 = runtime->buffer_size - runtime->avail;
 926				runtime->xruns += count - count1;
 927			}
 928			if (count1 > 0) {
 929				memcpy(runtime->buffer, buffer, count1);
 930				runtime->hw_ptr = count1;
 931				runtime->avail += count1;
 932				result += count1;
 933			}
 934		}
 935	}
 936	if (result > 0) {
 937		if (runtime->event)
 938			schedule_work(&runtime->event_work);
 939		else if (snd_rawmidi_ready(substream))
 940			wake_up(&runtime->sleep);
 941	}
 942	spin_unlock_irqrestore(&runtime->lock, flags);
 
 943	return result;
 944}
 945EXPORT_SYMBOL(snd_rawmidi_receive);
 946
 947static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 948				     unsigned char __user *userbuf,
 949				     unsigned char *kernelbuf, long count)
 950{
 951	unsigned long flags;
 952	long result = 0, count1;
 953	struct snd_rawmidi_runtime *runtime = substream->runtime;
 954	unsigned long appl_ptr;
 
 955
 956	spin_lock_irqsave(&runtime->lock, flags);
 
 957	while (count > 0 && runtime->avail) {
 958		count1 = runtime->buffer_size - runtime->appl_ptr;
 959		if (count1 > count)
 960			count1 = count;
 961		if (count1 > (int)runtime->avail)
 962			count1 = runtime->avail;
 963
 964		/* update runtime->appl_ptr before unlocking for userbuf */
 965		appl_ptr = runtime->appl_ptr;
 966		runtime->appl_ptr += count1;
 967		runtime->appl_ptr %= runtime->buffer_size;
 968		runtime->avail -= count1;
 969
 970		if (kernelbuf)
 971			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
 972		if (userbuf) {
 973			spin_unlock_irqrestore(&runtime->lock, flags);
 974			if (copy_to_user(userbuf + result,
 975					 runtime->buffer + appl_ptr, count1)) {
 976				return result > 0 ? result : -EFAULT;
 977			}
 978			spin_lock_irqsave(&runtime->lock, flags);
 
 979		}
 980		result += count1;
 981		count -= count1;
 982	}
 983	spin_unlock_irqrestore(&runtime->lock, flags);
 984	return result;
 
 
 985}
 986
 987long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 988			     unsigned char *buf, long count)
 989{
 990	snd_rawmidi_input_trigger(substream, 1);
 991	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 992}
 993EXPORT_SYMBOL(snd_rawmidi_kernel_read);
 994
 995static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 996				loff_t *offset)
 997{
 998	long result;
 999	int count1;
1000	struct snd_rawmidi_file *rfile;
1001	struct snd_rawmidi_substream *substream;
1002	struct snd_rawmidi_runtime *runtime;
1003
1004	rfile = file->private_data;
1005	substream = rfile->input;
1006	if (substream == NULL)
1007		return -EIO;
1008	runtime = substream->runtime;
1009	snd_rawmidi_input_trigger(substream, 1);
1010	result = 0;
1011	while (count > 0) {
1012		spin_lock_irq(&runtime->lock);
1013		while (!snd_rawmidi_ready(substream)) {
1014			wait_queue_entry_t wait;
 
1015			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1016				spin_unlock_irq(&runtime->lock);
1017				return result > 0 ? result : -EAGAIN;
1018			}
1019			init_waitqueue_entry(&wait, current);
1020			add_wait_queue(&runtime->sleep, &wait);
1021			set_current_state(TASK_INTERRUPTIBLE);
1022			spin_unlock_irq(&runtime->lock);
1023			schedule();
1024			remove_wait_queue(&runtime->sleep, &wait);
1025			if (rfile->rmidi->card->shutdown)
1026				return -ENODEV;
1027			if (signal_pending(current))
1028				return result > 0 ? result : -ERESTARTSYS;
1029			if (!runtime->avail)
 
 
1030				return result > 0 ? result : -EIO;
1031			spin_lock_irq(&runtime->lock);
1032		}
1033		spin_unlock_irq(&runtime->lock);
1034		count1 = snd_rawmidi_kernel_read1(substream,
1035						  (unsigned char __user *)buf,
1036						  NULL/*kernelbuf*/,
1037						  count);
1038		if (count1 < 0)
1039			return result > 0 ? result : count1;
1040		result += count1;
1041		buf += count1;
1042		count -= count1;
1043	}
1044	return result;
1045}
1046
1047/**
1048 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1049 * @substream: the rawmidi substream
1050 *
1051 * Return: 1 if the internal output buffer is empty, 0 if not.
1052 */
1053int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1054{
1055	struct snd_rawmidi_runtime *runtime = substream->runtime;
1056	int result;
1057	unsigned long flags;
1058
1059	if (runtime->buffer == NULL) {
 
 
1060		rmidi_dbg(substream->rmidi,
1061			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1062		return 1;
 
 
1063	}
1064	spin_lock_irqsave(&runtime->lock, flags);
1065	result = runtime->avail >= runtime->buffer_size;
1066	spin_unlock_irqrestore(&runtime->lock, flags);
1067	return result;		
1068}
1069EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1070
1071/**
1072 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1073 * @substream: the rawmidi substream
1074 * @buffer: the buffer pointer
1075 * @count: data size to transfer
1076 *
1077 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1078 */
1079int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1080			      unsigned char *buffer, int count)
1081{
1082	int result, count1;
1083	struct snd_rawmidi_runtime *runtime = substream->runtime;
1084
1085	if (runtime->buffer == NULL) {
1086		rmidi_dbg(substream->rmidi,
1087			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1088		return -EINVAL;
1089	}
1090	result = 0;
1091	if (runtime->avail >= runtime->buffer_size) {
1092		/* warning: lowlevel layer MUST trigger down the hardware */
1093		goto __skip;
1094	}
1095	if (count == 1) {	/* special case, faster code */
1096		*buffer = runtime->buffer[runtime->hw_ptr];
1097		result++;
1098	} else {
1099		count1 = runtime->buffer_size - runtime->hw_ptr;
1100		if (count1 > count)
1101			count1 = count;
1102		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1103			count1 = runtime->buffer_size - runtime->avail;
1104		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1105		count -= count1;
1106		result += count1;
1107		if (count > 0) {
1108			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1109				count = runtime->buffer_size - runtime->avail - count1;
1110			memcpy(buffer + count1, runtime->buffer, count);
1111			result += count;
1112		}
1113	}
1114      __skip:
1115	return result;
1116}
1117EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1118
1119/**
1120 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1121 * @substream: the rawmidi substream
1122 * @buffer: the buffer pointer
1123 * @count: data size to transfer
1124 *
1125 * Copies data from the internal output buffer to the given buffer.
1126 *
1127 * Call this in the interrupt handler when the midi output is ready,
1128 * and call snd_rawmidi_transmit_ack() after the transmission is
1129 * finished.
1130 *
1131 * Return: The size of copied data, or a negative error code on failure.
1132 */
1133int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1134			      unsigned char *buffer, int count)
1135{
1136	struct snd_rawmidi_runtime *runtime = substream->runtime;
1137	int result;
1138	unsigned long flags;
1139
1140	spin_lock_irqsave(&runtime->lock, flags);
1141	result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1142	spin_unlock_irqrestore(&runtime->lock, flags);
 
 
 
1143	return result;
1144}
1145EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1146
1147/**
1148 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1149 * @substream: the rawmidi substream
1150 * @count: the transferred count
1151 *
1152 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1153 */
1154int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
 
1155{
1156	struct snd_rawmidi_runtime *runtime = substream->runtime;
1157
1158	if (runtime->buffer == NULL) {
1159		rmidi_dbg(substream->rmidi,
1160			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1161		return -EINVAL;
1162	}
1163	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1164	runtime->hw_ptr += count;
1165	runtime->hw_ptr %= runtime->buffer_size;
1166	runtime->avail += count;
1167	substream->bytes += count;
1168	if (count > 0) {
1169		if (runtime->drain || snd_rawmidi_ready(substream))
1170			wake_up(&runtime->sleep);
1171	}
1172	return count;
1173}
1174EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1175
1176/**
1177 * snd_rawmidi_transmit_ack - acknowledge the transmission
1178 * @substream: the rawmidi substream
1179 * @count: the transferred count
1180 *
1181 * Advances the hardware pointer for the internal output buffer with
1182 * the given size and updates the condition.
1183 * Call after the transmission is finished.
1184 *
1185 * Return: The advanced size if successful, or a negative error code on failure.
1186 */
1187int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1188{
1189	struct snd_rawmidi_runtime *runtime = substream->runtime;
1190	int result;
1191	unsigned long flags;
1192
1193	spin_lock_irqsave(&runtime->lock, flags);
1194	result = __snd_rawmidi_transmit_ack(substream, count);
1195	spin_unlock_irqrestore(&runtime->lock, flags);
 
 
 
1196	return result;
1197}
1198EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1199
1200/**
1201 * snd_rawmidi_transmit - copy from the buffer to the device
1202 * @substream: the rawmidi substream
1203 * @buffer: the buffer pointer
1204 * @count: the data size to transfer
1205 * 
1206 * Copies data from the buffer to the device and advances the pointer.
1207 *
1208 * Return: The copied size if successful, or a negative error code on failure.
1209 */
1210int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1211			 unsigned char *buffer, int count)
1212{
1213	struct snd_rawmidi_runtime *runtime = substream->runtime;
1214	int result;
1215	unsigned long flags;
1216
1217	spin_lock_irqsave(&runtime->lock, flags);
1218	if (!substream->opened)
1219		result = -EBADFD;
1220	else {
1221		count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1222		if (count <= 0)
1223			result = count;
1224		else
1225			result = __snd_rawmidi_transmit_ack(substream, count);
1226	}
1227	spin_unlock_irqrestore(&runtime->lock, flags);
1228	return result;
1229}
1230EXPORT_SYMBOL(snd_rawmidi_transmit);
1231
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1232static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1233				      const unsigned char __user *userbuf,
1234				      const unsigned char *kernelbuf,
1235				      long count)
1236{
1237	unsigned long flags;
1238	long count1, result;
1239	struct snd_rawmidi_runtime *runtime = substream->runtime;
1240	unsigned long appl_ptr;
1241
1242	if (!kernelbuf && !userbuf)
1243		return -EINVAL;
1244	if (snd_BUG_ON(!runtime->buffer))
1245		return -EINVAL;
1246
1247	result = 0;
1248	spin_lock_irqsave(&runtime->lock, flags);
1249	if (substream->append) {
1250		if ((long)runtime->avail < count) {
1251			spin_unlock_irqrestore(&runtime->lock, flags);
1252			return -EAGAIN;
1253		}
1254	}
 
1255	while (count > 0 && runtime->avail > 0) {
1256		count1 = runtime->buffer_size - runtime->appl_ptr;
1257		if (count1 > count)
1258			count1 = count;
1259		if (count1 > (long)runtime->avail)
1260			count1 = runtime->avail;
1261
1262		/* update runtime->appl_ptr before unlocking for userbuf */
1263		appl_ptr = runtime->appl_ptr;
1264		runtime->appl_ptr += count1;
1265		runtime->appl_ptr %= runtime->buffer_size;
1266		runtime->avail -= count1;
1267
1268		if (kernelbuf)
1269			memcpy(runtime->buffer + appl_ptr,
1270			       kernelbuf + result, count1);
1271		else if (userbuf) {
1272			spin_unlock_irqrestore(&runtime->lock, flags);
1273			if (copy_from_user(runtime->buffer + appl_ptr,
1274					   userbuf + result, count1)) {
1275				spin_lock_irqsave(&runtime->lock, flags);
1276				result = result > 0 ? result : -EFAULT;
1277				goto __end;
1278			}
1279			spin_lock_irqsave(&runtime->lock, flags);
1280		}
1281		result += count1;
1282		count -= count1;
1283	}
1284      __end:
1285	count1 = runtime->avail < runtime->buffer_size;
1286	spin_unlock_irqrestore(&runtime->lock, flags);
 
1287	if (count1)
1288		snd_rawmidi_output_trigger(substream, 1);
1289	return result;
1290}
1291
1292long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1293			      const unsigned char *buf, long count)
1294{
1295	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1296}
1297EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1298
1299static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1300				 size_t count, loff_t *offset)
1301{
1302	long result, timeout;
1303	int count1;
1304	struct snd_rawmidi_file *rfile;
1305	struct snd_rawmidi_runtime *runtime;
1306	struct snd_rawmidi_substream *substream;
1307
1308	rfile = file->private_data;
1309	substream = rfile->output;
1310	runtime = substream->runtime;
1311	/* we cannot put an atomic message to our buffer */
1312	if (substream->append && count > runtime->buffer_size)
1313		return -EIO;
1314	result = 0;
1315	while (count > 0) {
1316		spin_lock_irq(&runtime->lock);
1317		while (!snd_rawmidi_ready_append(substream, count)) {
1318			wait_queue_entry_t wait;
 
1319			if (file->f_flags & O_NONBLOCK) {
1320				spin_unlock_irq(&runtime->lock);
1321				return result > 0 ? result : -EAGAIN;
1322			}
1323			init_waitqueue_entry(&wait, current);
1324			add_wait_queue(&runtime->sleep, &wait);
1325			set_current_state(TASK_INTERRUPTIBLE);
1326			spin_unlock_irq(&runtime->lock);
1327			timeout = schedule_timeout(30 * HZ);
1328			remove_wait_queue(&runtime->sleep, &wait);
1329			if (rfile->rmidi->card->shutdown)
1330				return -ENODEV;
1331			if (signal_pending(current))
1332				return result > 0 ? result : -ERESTARTSYS;
1333			if (!runtime->avail && !timeout)
 
 
1334				return result > 0 ? result : -EIO;
1335			spin_lock_irq(&runtime->lock);
1336		}
1337		spin_unlock_irq(&runtime->lock);
1338		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1339		if (count1 < 0)
1340			return result > 0 ? result : count1;
1341		result += count1;
1342		buf += count1;
1343		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1344			break;
1345		count -= count1;
1346	}
1347	if (file->f_flags & O_DSYNC) {
1348		spin_lock_irq(&runtime->lock);
1349		while (runtime->avail != runtime->buffer_size) {
1350			wait_queue_entry_t wait;
1351			unsigned int last_avail = runtime->avail;
 
1352			init_waitqueue_entry(&wait, current);
1353			add_wait_queue(&runtime->sleep, &wait);
1354			set_current_state(TASK_INTERRUPTIBLE);
1355			spin_unlock_irq(&runtime->lock);
1356			timeout = schedule_timeout(30 * HZ);
1357			remove_wait_queue(&runtime->sleep, &wait);
1358			if (signal_pending(current))
1359				return result > 0 ? result : -ERESTARTSYS;
1360			if (runtime->avail == last_avail && !timeout)
1361				return result > 0 ? result : -EIO;
1362			spin_lock_irq(&runtime->lock);
1363		}
1364		spin_unlock_irq(&runtime->lock);
1365	}
1366	return result;
1367}
1368
1369static __poll_t snd_rawmidi_poll(struct file *file, poll_table * wait)
1370{
1371	struct snd_rawmidi_file *rfile;
1372	struct snd_rawmidi_runtime *runtime;
1373	__poll_t mask;
1374
1375	rfile = file->private_data;
1376	if (rfile->input != NULL) {
1377		runtime = rfile->input->runtime;
1378		snd_rawmidi_input_trigger(rfile->input, 1);
1379		poll_wait(file, &runtime->sleep, wait);
1380	}
1381	if (rfile->output != NULL) {
1382		runtime = rfile->output->runtime;
1383		poll_wait(file, &runtime->sleep, wait);
1384	}
1385	mask = 0;
1386	if (rfile->input != NULL) {
1387		if (snd_rawmidi_ready(rfile->input))
1388			mask |= EPOLLIN | EPOLLRDNORM;
1389	}
1390	if (rfile->output != NULL) {
1391		if (snd_rawmidi_ready(rfile->output))
1392			mask |= EPOLLOUT | EPOLLWRNORM;
1393	}
1394	return mask;
1395}
1396
1397/*
1398 */
1399#ifdef CONFIG_COMPAT
1400#include "rawmidi_compat.c"
1401#else
1402#define snd_rawmidi_ioctl_compat	NULL
1403#endif
1404
1405/*
1406
1407 */
1408
1409static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1410				       struct snd_info_buffer *buffer)
1411{
1412	struct snd_rawmidi *rmidi;
1413	struct snd_rawmidi_substream *substream;
1414	struct snd_rawmidi_runtime *runtime;
 
 
 
1415
1416	rmidi = entry->private_data;
1417	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1418	mutex_lock(&rmidi->open_mutex);
1419	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1420		list_for_each_entry(substream,
1421				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1422				    list) {
1423			snd_iprintf(buffer,
1424				    "Output %d\n"
1425				    "  Tx bytes     : %lu\n",
1426				    substream->number,
1427				    (unsigned long) substream->bytes);
1428			if (substream->opened) {
1429				snd_iprintf(buffer,
1430				    "  Owner PID    : %d\n",
1431				    pid_vnr(substream->pid));
1432				runtime = substream->runtime;
 
 
 
 
1433				snd_iprintf(buffer,
1434				    "  Mode         : %s\n"
1435				    "  Buffer size  : %lu\n"
1436				    "  Avail        : %lu\n",
1437				    runtime->oss ? "OSS compatible" : "native",
1438				    (unsigned long) runtime->buffer_size,
1439				    (unsigned long) runtime->avail);
1440			}
1441		}
1442	}
1443	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1444		list_for_each_entry(substream,
1445				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1446				    list) {
1447			snd_iprintf(buffer,
1448				    "Input %d\n"
1449				    "  Rx bytes     : %lu\n",
1450				    substream->number,
1451				    (unsigned long) substream->bytes);
1452			if (substream->opened) {
1453				snd_iprintf(buffer,
1454					    "  Owner PID    : %d\n",
1455					    pid_vnr(substream->pid));
1456				runtime = substream->runtime;
 
 
 
 
 
1457				snd_iprintf(buffer,
1458					    "  Buffer size  : %lu\n"
1459					    "  Avail        : %lu\n"
1460					    "  Overruns     : %lu\n",
1461					    (unsigned long) runtime->buffer_size,
1462					    (unsigned long) runtime->avail,
1463					    (unsigned long) runtime->xruns);
 
 
 
 
 
 
1464			}
1465		}
1466	}
1467	mutex_unlock(&rmidi->open_mutex);
1468}
1469
1470/*
1471 *  Register functions
1472 */
1473
1474static const struct file_operations snd_rawmidi_f_ops =
1475{
1476	.owner =	THIS_MODULE,
1477	.read =		snd_rawmidi_read,
1478	.write =	snd_rawmidi_write,
1479	.open =		snd_rawmidi_open,
1480	.release =	snd_rawmidi_release,
1481	.llseek =	no_llseek,
1482	.poll =		snd_rawmidi_poll,
1483	.unlocked_ioctl =	snd_rawmidi_ioctl,
1484	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1485};
1486
1487static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1488					struct snd_rawmidi_str *stream,
1489					int direction,
1490					int count)
1491{
1492	struct snd_rawmidi_substream *substream;
1493	int idx;
1494
1495	for (idx = 0; idx < count; idx++) {
1496		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1497		if (!substream)
1498			return -ENOMEM;
1499		substream->stream = direction;
1500		substream->number = idx;
1501		substream->rmidi = rmidi;
1502		substream->pstr = stream;
 
1503		list_add_tail(&substream->list, &stream->substreams);
1504		stream->substream_count++;
1505	}
1506	return 0;
1507}
1508
1509static void release_rawmidi_device(struct device *dev)
1510{
1511	kfree(container_of(dev, struct snd_rawmidi, dev));
1512}
1513
1514/**
1515 * snd_rawmidi_new - create a rawmidi instance
1516 * @card: the card instance
1517 * @id: the id string
1518 * @device: the device index
1519 * @output_count: the number of output streams
1520 * @input_count: the number of input streams
1521 * @rrawmidi: the pointer to store the new rawmidi instance
1522 *
1523 * Creates a new rawmidi instance.
1524 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1525 *
1526 * Return: Zero if successful, or a negative error code on failure.
1527 */
1528int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1529		    int output_count, int input_count,
1530		    struct snd_rawmidi ** rrawmidi)
1531{
1532	struct snd_rawmidi *rmidi;
1533	int err;
1534	static struct snd_device_ops ops = {
1535		.dev_free = snd_rawmidi_dev_free,
1536		.dev_register = snd_rawmidi_dev_register,
1537		.dev_disconnect = snd_rawmidi_dev_disconnect,
1538	};
1539
1540	if (snd_BUG_ON(!card))
1541		return -ENXIO;
1542	if (rrawmidi)
1543		*rrawmidi = NULL;
1544	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1545	if (!rmidi)
1546		return -ENOMEM;
1547	rmidi->card = card;
1548	rmidi->device = device;
1549	mutex_init(&rmidi->open_mutex);
1550	init_waitqueue_head(&rmidi->open_wait);
1551	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1552	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1553
1554	if (id != NULL)
1555		strlcpy(rmidi->id, id, sizeof(rmidi->id));
1556
1557	snd_device_initialize(&rmidi->dev, card);
1558	rmidi->dev.release = release_rawmidi_device;
1559	dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1560
1561	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1562						&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1563						SNDRV_RAWMIDI_STREAM_INPUT,
1564						input_count)) < 0) {
1565		snd_rawmidi_free(rmidi);
1566		return err;
1567	}
1568	if ((err = snd_rawmidi_alloc_substreams(rmidi,
1569						&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1570						SNDRV_RAWMIDI_STREAM_OUTPUT,
1571						output_count)) < 0) {
1572		snd_rawmidi_free(rmidi);
1573		return err;
1574	}
1575	if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1576		snd_rawmidi_free(rmidi);
1577		return err;
1578	}
1579	if (rrawmidi)
1580		*rrawmidi = rmidi;
1581	return 0;
 
 
 
 
1582}
1583EXPORT_SYMBOL(snd_rawmidi_new);
1584
1585static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1586{
1587	struct snd_rawmidi_substream *substream;
1588
1589	while (!list_empty(&stream->substreams)) {
1590		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1591		list_del(&substream->list);
1592		kfree(substream);
1593	}
1594}
1595
1596static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1597{
1598	if (!rmidi)
1599		return 0;
1600
1601	snd_info_free_entry(rmidi->proc_entry);
1602	rmidi->proc_entry = NULL;
1603	mutex_lock(&register_mutex);
1604	if (rmidi->ops && rmidi->ops->dev_unregister)
1605		rmidi->ops->dev_unregister(rmidi);
1606	mutex_unlock(&register_mutex);
1607
1608	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1609	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1610	if (rmidi->private_free)
1611		rmidi->private_free(rmidi);
1612	put_device(&rmidi->dev);
1613	return 0;
1614}
1615
1616static int snd_rawmidi_dev_free(struct snd_device *device)
1617{
1618	struct snd_rawmidi *rmidi = device->device_data;
 
1619	return snd_rawmidi_free(rmidi);
1620}
1621
1622#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1623static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1624{
1625	struct snd_rawmidi *rmidi = device->private_data;
 
1626	rmidi->seq_dev = NULL;
1627}
1628#endif
1629
1630static int snd_rawmidi_dev_register(struct snd_device *device)
1631{
1632	int err;
1633	struct snd_info_entry *entry;
1634	char name[16];
1635	struct snd_rawmidi *rmidi = device->device_data;
1636
1637	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1638		return -ENOMEM;
 
1639	mutex_lock(&register_mutex);
1640	if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1641		mutex_unlock(&register_mutex);
1642		return -EBUSY;
1643	}
1644	list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1645	mutex_unlock(&register_mutex);
 
 
 
1646	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1647				  rmidi->card, rmidi->device,
1648				  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1649	if (err < 0) {
1650		rmidi_err(rmidi, "unable to register\n");
1651		mutex_lock(&register_mutex);
1652		list_del(&rmidi->list);
1653		mutex_unlock(&register_mutex);
1654		return err;
1655	}
1656	if (rmidi->ops && rmidi->ops->dev_register &&
1657	    (err = rmidi->ops->dev_register(rmidi)) < 0) {
1658		snd_unregister_device(&rmidi->dev);
1659		mutex_lock(&register_mutex);
1660		list_del(&rmidi->list);
1661		mutex_unlock(&register_mutex);
1662		return err;
1663	}
1664#ifdef CONFIG_SND_OSSEMUL
1665	rmidi->ossreg = 0;
1666	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1667		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1668					    rmidi->card, 0, &snd_rawmidi_f_ops,
1669					    rmidi) < 0) {
1670			rmidi_err(rmidi,
1671				  "unable to register OSS rawmidi device %i:%i\n",
1672				  rmidi->card->number, 0);
1673		} else {
1674			rmidi->ossreg++;
1675#ifdef SNDRV_OSS_INFO_DEV_MIDI
1676			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1677#endif
1678		}
1679	}
1680	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1681		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1682					    rmidi->card, 1, &snd_rawmidi_f_ops,
1683					    rmidi) < 0) {
1684			rmidi_err(rmidi,
1685				  "unable to register OSS rawmidi device %i:%i\n",
1686				  rmidi->card->number, 1);
1687		} else {
1688			rmidi->ossreg++;
1689		}
1690	}
1691#endif /* CONFIG_SND_OSSEMUL */
1692	sprintf(name, "midi%d", rmidi->device);
1693	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1694	if (entry) {
1695		entry->private_data = rmidi;
1696		entry->c.text.read = snd_rawmidi_proc_info_read;
1697		if (snd_info_register(entry) < 0) {
1698			snd_info_free_entry(entry);
1699			entry = NULL;
1700		}
1701	}
1702	rmidi->proc_entry = entry;
1703#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1704	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1705		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1706			rmidi->seq_dev->private_data = rmidi;
1707			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1708			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1709			snd_device_register(rmidi->card, rmidi->seq_dev);
1710		}
1711	}
1712#endif
1713	return 0;
 
 
 
 
 
 
 
 
1714}
1715
1716static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1717{
1718	struct snd_rawmidi *rmidi = device->device_data;
1719	int dir;
1720
1721	mutex_lock(&register_mutex);
1722	mutex_lock(&rmidi->open_mutex);
1723	wake_up(&rmidi->open_wait);
1724	list_del_init(&rmidi->list);
1725	for (dir = 0; dir < 2; dir++) {
1726		struct snd_rawmidi_substream *s;
 
1727		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1728			if (s->runtime)
1729				wake_up(&s->runtime->sleep);
1730		}
1731	}
1732
1733#ifdef CONFIG_SND_OSSEMUL
1734	if (rmidi->ossreg) {
1735		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1736			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1737#ifdef SNDRV_OSS_INFO_DEV_MIDI
1738			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1739#endif
1740		}
1741		if ((int)rmidi->device == amidi_map[rmidi->card->number])
1742			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1743		rmidi->ossreg = 0;
1744	}
1745#endif /* CONFIG_SND_OSSEMUL */
1746	snd_unregister_device(&rmidi->dev);
1747	mutex_unlock(&rmidi->open_mutex);
1748	mutex_unlock(&register_mutex);
1749	return 0;
1750}
1751
1752/**
1753 * snd_rawmidi_set_ops - set the rawmidi operators
1754 * @rmidi: the rawmidi instance
1755 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1756 * @ops: the operator table
1757 *
1758 * Sets the rawmidi operators for the given stream direction.
1759 */
1760void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1761			 const struct snd_rawmidi_ops *ops)
1762{
1763	struct snd_rawmidi_substream *substream;
1764	
1765	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1766		substream->ops = ops;
1767}
1768EXPORT_SYMBOL(snd_rawmidi_set_ops);
1769
1770/*
1771 *  ENTRY functions
1772 */
1773
1774static int __init alsa_rawmidi_init(void)
1775{
1776
1777	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1778	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1779#ifdef CONFIG_SND_OSSEMUL
1780	{ int i;
1781	/* check device map table */
1782	for (i = 0; i < SNDRV_CARDS; i++) {
1783		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1784			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1785			       i, midi_map[i]);
1786			midi_map[i] = 0;
1787		}
1788		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1789			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1790			       i, amidi_map[i]);
1791			amidi_map[i] = 1;
1792		}
1793	}
1794	}
1795#endif /* CONFIG_SND_OSSEMUL */
1796	return 0;
1797}
1798
1799static void __exit alsa_rawmidi_exit(void)
1800{
1801	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1802	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1803}
1804
1805module_init(alsa_rawmidi_init)
1806module_exit(alsa_rawmidi_exit)