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