extcon.c 35.6 KB
Newer Older
1
/*
2
 * drivers/extcon/extcon.c - External Connector (extcon) framework.
3
 *
4 5 6
 * Copyright (C) 2015 Samsung Electronics
 * Author: Chanwoo Choi <cw00.choi@samsung.com>
 *
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
 * Copyright (C) 2012 Samsung Electronics
 * Author: Donggeun Kim <dg77.kim@samsung.com>
 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
 *
 * based on android/drivers/switch/switch_class.c
 * Copyright (C) 2008 Google, Inc.
 * Author: Mike Lockwood <lockwood@android.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
23
 */
24 25 26 27 28 29 30

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/err.h>
31
#include <linux/of.h>
32
#include <linux/slab.h>
33
#include <linux/sysfs.h>
34

35 36
#include "extcon.h"

37 38
#define SUPPORTED_CABLE_MAX	32

39
static const struct __extcon_info {
40 41 42 43 44 45 46 47 48 49
	unsigned int type;
	unsigned int id;
	const char *name;

} extcon_info[] = {
	[EXTCON_NONE] = {
		.type = EXTCON_TYPE_MISC,
		.id = EXTCON_NONE,
		.name = "NONE",
	},
50

51
	/* USB external connector */
52 53 54 55 56 57 58 59
	[EXTCON_USB] = {
		.type = EXTCON_TYPE_USB,
		.id = EXTCON_USB,
		.name = "USB",
	},
	[EXTCON_USB_HOST] = {
		.type = EXTCON_TYPE_USB,
		.id = EXTCON_USB_HOST,
60
		.name = "USB-HOST",
61
	},
62

63
	/* Charging external connector */
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
	[EXTCON_CHG_USB_SDP] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_SDP,
		.name = "SDP",
	},
	[EXTCON_CHG_USB_DCP] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_DCP,
		.name = "DCP",
	},
	[EXTCON_CHG_USB_CDP] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_CDP,
		.name = "CDP",
	},
	[EXTCON_CHG_USB_ACA] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_ACA,
		.name = "ACA",
	},
	[EXTCON_CHG_USB_FAST] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_FAST,
		.name = "FAST-CHARGER",
	},
	[EXTCON_CHG_USB_SLOW] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_SLOW,
		.name = "SLOW-CHARGER",
	},
94 95 96 97 98
	[EXTCON_CHG_WPT] = {
		.type = EXTCON_TYPE_CHG,
		.id = EXTCON_CHG_WPT,
		.name = "WPT",
	},
99 100 101 102 103
	[EXTCON_CHG_USB_PD] = {
		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
		.id = EXTCON_CHG_USB_PD,
		.name = "PD",
	},
104

105
	/* Jack external connector */
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145
	[EXTCON_JACK_MICROPHONE] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_MICROPHONE,
		.name = "MICROPHONE",
	},
	[EXTCON_JACK_HEADPHONE] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_HEADPHONE,
		.name = "HEADPHONE",
	},
	[EXTCON_JACK_LINE_IN] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_LINE_IN,
		.name = "LINE-IN",
	},
	[EXTCON_JACK_LINE_OUT] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_LINE_OUT,
		.name = "LINE-OUT",
	},
	[EXTCON_JACK_VIDEO_IN] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_VIDEO_IN,
		.name = "VIDEO-IN",
	},
	[EXTCON_JACK_VIDEO_OUT] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_VIDEO_OUT,
		.name = "VIDEO-OUT",
	},
	[EXTCON_JACK_SPDIF_IN] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_SPDIF_IN,
		.name = "SPDIF-IN",
	},
	[EXTCON_JACK_SPDIF_OUT] = {
		.type = EXTCON_TYPE_JACK,
		.id = EXTCON_JACK_SPDIF_OUT,
		.name = "SPDIF-OUT",
	},
146

147
	/* Display external connector */
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
	[EXTCON_DISP_HDMI] = {
		.type = EXTCON_TYPE_DISP,
		.id = EXTCON_DISP_HDMI,
		.name = "HDMI",
	},
	[EXTCON_DISP_MHL] = {
		.type = EXTCON_TYPE_DISP,
		.id = EXTCON_DISP_MHL,
		.name = "MHL",
	},
	[EXTCON_DISP_DVI] = {
		.type = EXTCON_TYPE_DISP,
		.id = EXTCON_DISP_DVI,
		.name = "DVI",
	},
	[EXTCON_DISP_VGA] = {
		.type = EXTCON_TYPE_DISP,
		.id = EXTCON_DISP_VGA,
		.name = "VGA",
	},
168 169 170 171 172
	[EXTCON_DISP_DP] = {
		.type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
		.id = EXTCON_DISP_DP,
		.name = "DP",
	},
173 174 175 176 177
	[EXTCON_DISP_HMD] = {
		.type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
		.id = EXTCON_DISP_HMD,
		.name = "HMD",
	},
178

179
	/* Miscellaneous external connector */
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196
	[EXTCON_DOCK] = {
		.type = EXTCON_TYPE_MISC,
		.id = EXTCON_DOCK,
		.name = "DOCK",
	},
	[EXTCON_JIG] = {
		.type = EXTCON_TYPE_MISC,
		.id = EXTCON_JIG,
		.name = "JIG",
	},
	[EXTCON_MECHANICAL] = {
		.type = EXTCON_TYPE_MISC,
		.id = EXTCON_MECHANICAL,
		.name = "MECHANICAL",
	},

	{ /* sentinel */ }
197 198
};

199
/**
200 201 202 203
 * struct extcon_cable - An internal data for an external connector.
 * @edev:		the extcon device
 * @cable_index:	the index of this cable in the edev
 * @attr_g:		the attribute group for the cable
204 205
 * @attr_name:		"name" sysfs entry
 * @attr_state:		"state" sysfs entry
206
 * @attrs:		the array pointing to attr_name and attr_state for attr_g
207 208 209 210 211 212 213 214 215 216
 */
struct extcon_cable {
	struct extcon_dev *edev;
	int cable_index;

	struct attribute_group attr_g;
	struct device_attribute attr_name;
	struct device_attribute attr_state;

	struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
217 218 219 220 221

	union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
	union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
	union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
	union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
222 223 224 225 226

	unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
	unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
	unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
	unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
227 228
};

Mark Brown's avatar
Mark Brown committed
229
static struct class *extcon_class;
230

231 232 233
static LIST_HEAD(extcon_dev_list);
static DEFINE_MUTEX(extcon_dev_list_lock);

234 235 236 237 238 239 240 241
static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
{
	int i = 0;

	if (!edev->mutually_exclusive)
		return 0;

	for (i = 0; edev->mutually_exclusive[i]; i++) {
242
		int weight;
243 244
		u32 correspondants = new_state & edev->mutually_exclusive[i];

245 246 247 248
		/* calculate the total number of bits set */
		weight = hweight32(correspondants);
		if (weight > 1)
			return i + 1;
249 250 251 252 253
	}

	return 0;
}

254
static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
255 256 257 258 259 260 261 262 263 264 265 266
{
	int i;

	/* Find the the index of extcon cable in edev->supported_cable */
	for (i = 0; i < edev->max_supported; i++) {
		if (edev->supported_cable[i] == id)
			return i;
	}

	return -EINVAL;
}

267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
static int get_extcon_type(unsigned int prop)
{
	switch (prop) {
	case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
		return EXTCON_TYPE_USB;
	case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
		return EXTCON_TYPE_CHG;
	case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
		return EXTCON_TYPE_JACK;
	case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
		return EXTCON_TYPE_DISP;
	default:
		return -EINVAL;
	}
}

static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
{
	return !!(edev->state & BIT(index));
}

288 289
static bool is_extcon_changed(struct extcon_dev *edev, int index,
				bool new_state)
290
{
291 292
	int state = !!(edev->state & BIT(index));
	return (state != new_state);
293 294
}

295 296 297 298 299 300 301 302 303 304 305 306 307
static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
{
	int type;

	/* Check whether the property is supported or not. */
	type = get_extcon_type(prop);
	if (type < 0)
		return false;

	/* Check whether a specific extcon id supports the property or not. */
	return !!(extcon_info[id].type & type);
}

308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340
static int is_extcon_property_capability(struct extcon_dev *edev,
				unsigned int id, int index,unsigned int prop)
{
	struct extcon_cable *cable;
	int type, ret;

	/* Check whether the property is supported or not. */
	type = get_extcon_type(prop);
	if (type < 0)
		return type;

	cable = &edev->cables[index];

	switch (type) {
	case EXTCON_TYPE_USB:
		ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
		break;
	case EXTCON_TYPE_CHG:
		ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
		break;
	case EXTCON_TYPE_JACK:
		ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
		break;
	case EXTCON_TYPE_DISP:
		ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

341 342 343 344 345 346 347 348 349 350 351 352 353 354 355
static void init_property(struct extcon_dev *edev, unsigned int id, int index)
{
	unsigned int type = extcon_info[id].type;
	struct extcon_cable *cable = &edev->cables[index];

	if (EXTCON_TYPE_USB & type)
		memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
	if (EXTCON_TYPE_CHG & type)
		memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
	if (EXTCON_TYPE_JACK & type)
		memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
	if (EXTCON_TYPE_DISP & type)
		memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
}

356 357 358
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
359
	int i, count = 0;
360
	struct extcon_dev *edev = dev_get_drvdata(dev);
361

362 363 364
	if (edev->max_supported == 0)
		return sprintf(buf, "%u\n", edev->state);

365
	for (i = 0; i < edev->max_supported; i++) {
366
		count += sprintf(buf + count, "%s=%d\n",
367
				extcon_info[edev->supported_cable[i]].name,
368
				 !!(edev->state & BIT(i)));
369 370 371 372
	}

	return count;
}
373
static DEVICE_ATTR_RO(state);
374 375 376 377

static ssize_t name_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
378
	struct extcon_dev *edev = dev_get_drvdata(dev);
379

380
	return sprintf(buf, "%s\n", edev->name);
381
}
382
static DEVICE_ATTR_RO(name);
383

384 385 386 387 388
static ssize_t cable_name_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct extcon_cable *cable = container_of(attr, struct extcon_cable,
						  attr_name);
389
	int i = cable->cable_index;
390 391

	return sprintf(buf, "%s\n",
392
			extcon_info[cable->edev->supported_cable[i]].name);
393 394 395 396 397 398 399 400
}

static ssize_t cable_state_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct extcon_cable *cable = container_of(attr, struct extcon_cable,
						  attr_state);

401 402
	int i = cable->cable_index;

403
	return sprintf(buf, "%d\n",
404
		extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
405 406
}

407
/**
408 409 410 411 412
 * extcon_sync() - Synchronize the state for an external connector.
 * @edev:	the extcon device
 *
 * Note that this function send a notification in order to synchronize
 * the state and property of an external connector.
413
 *
414
 * Returns 0 if success or error number if fail.
415
 */
416
int extcon_sync(struct extcon_dev *edev, unsigned int id)
417 418 419 420 421 422 423
{
	char name_buf[120];
	char state_buf[120];
	char *prop_buf;
	char *envp[3];
	int env_offset = 0;
	int length;
424
	int index;
425
	int state;
426
	unsigned long flags;
427

428 429 430
	if (!edev)
		return -EINVAL;

431 432 433 434
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

435
	spin_lock_irqsave(&edev->lock, flags);
436

437
	state = !!(edev->state & BIT(index));
438 439 440 441 442

	/*
	 * Call functions in a raw notifier chain for the specific one
	 * external connector.
	 */
443 444
	raw_notifier_call_chain(&edev->nh[index], state, edev);

445 446 447 448 449 450
	/*
	 * Call functions in a raw notifier chain for the all supported
	 * external connectors.
	 */
	raw_notifier_call_chain(&edev->nh_all, state, edev);

451 452 453 454
	/* This could be in interrupt handler */
	prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
	if (!prop_buf) {
		/* Unlock early before uevent */
455
		spin_unlock_irqrestore(&edev->lock, flags);
456 457 458 459

		dev_err(&edev->dev, "out of memory in extcon_set_state\n");
		kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);

460
		return -ENOMEM;
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
	}

	length = name_show(&edev->dev, NULL, prop_buf);
	if (length > 0) {
		if (prop_buf[length - 1] == '\n')
			prop_buf[length - 1] = 0;
		snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
		envp[env_offset++] = name_buf;
	}

	length = state_show(&edev->dev, NULL, prop_buf);
	if (length > 0) {
		if (prop_buf[length - 1] == '\n')
			prop_buf[length - 1] = 0;
		snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
		envp[env_offset++] = state_buf;
477
	}
478 479 480 481 482 483
	envp[env_offset] = NULL;

	/* Unlock early before uevent */
	spin_unlock_irqrestore(&edev->lock, flags);
	kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
	free_page((unsigned long)prop_buf);
484 485

	return 0;
486
}
487
EXPORT_SYMBOL_GPL(extcon_sync);
488

489
/**
490 491 492 493 494
 * extcon_get_state() - Get the state of an external connector.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 *
 * Returns 0 if success or error number if fail.
495
 */
496
int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
497
{
498 499
	int index, state;
	unsigned long flags;
500

501 502 503
	if (!edev)
		return -EINVAL;

504 505 506
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;
507

508 509 510
	spin_lock_irqsave(&edev->lock, flags);
	state = is_extcon_attached(edev, index);
	spin_unlock_irqrestore(&edev->lock, flags);
511

512
	return state;
513
}
514
EXPORT_SYMBOL_GPL(extcon_get_state);
515 516

/**
517 518 519 520 521 522 523 524 525
 * extcon_set_state() - Set the state of an external connector.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @state:	the new state of an external connector.
 *		the default semantics is true: attached / false: detached.
 *
 * Note that this function set the state of an external connector without
 * a notification. To synchronize the state of an external connector,
 * have to use extcon_set_state_sync() and extcon_sync().
526
 *
527
 * Returns 0 if success or error number if fail.
528
 */
529
int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
530
{
531 532
	unsigned long flags;
	int index, ret = 0;
533

534 535 536
	if (!edev)
		return -EINVAL;

537 538 539 540
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

541 542 543
	spin_lock_irqsave(&edev->lock, flags);

	/* Check whether the external connector's state is changed. */
544
	if (!is_extcon_changed(edev, index, state))
545 546 547
		goto out;

	if (check_mutually_exclusive(edev,
548
		(edev->state & ~BIT(index)) | (state & BIT(index)))) {
549 550 551 552
		ret = -EPERM;
		goto out;
	}

553 554 555 556
	/*
	 * Initialize the value of extcon property before setting
	 * the detached state for an external connector.
	 */
557
	if (!state)
558 559
		init_property(edev, id, index);

560 561
	/* Update the state for an external connector. */
	if (state)
562 563 564 565 566 567 568
		edev->state |= BIT(index);
	else
		edev->state &= ~(BIT(index));
out:
	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
569
}
570
EXPORT_SYMBOL_GPL(extcon_set_state);
571

572
/**
573 574 575 576 577 578 579 580
 * extcon_set_state_sync() - Set the state of an external connector with sync.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @state:	the new state of external connector.
 *		the default semantics is true: attached / false: detached.
 *
 * Note that this function set the state of external connector
 * and synchronize the state by sending a notification.
581
 *
582
 * Returns 0 if success or error number if fail.
583
 */
584
int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
585 586 587 588 589 590 591 592 593 594
{
	int ret, index;
	unsigned long flags;

	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	/* Check whether the external connector's state is changed. */
	spin_lock_irqsave(&edev->lock, flags);
595
	ret = is_extcon_changed(edev, index, state);
596 597 598 599
	spin_unlock_irqrestore(&edev->lock, flags);
	if (!ret)
		return 0;

600
	ret = extcon_set_state(edev, id, state);
601 602 603 604 605 606 607
	if (ret < 0)
		return ret;

	return extcon_sync(edev, id);
}
EXPORT_SYMBOL_GPL(extcon_set_state_sync);

608
/**
609 610 611 612 613
 * extcon_get_property() - Get the property value of an external connector.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @prop:	the property id indicating an extcon property
 * @prop_val:	the pointer which store the value of extcon property
614
 *
615 616 617 618
 * Note that when getting the property value of external connector,
 * the external connector should be attached. If detached state, function
 * return 0 without property value. Also, the each property should be
 * included in the list of supported properties according to extcon type.
619
 *
620
 * Returns 0 if success or error number if fail.
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
 */
int extcon_get_property(struct extcon_dev *edev, unsigned int id,
				unsigned int prop,
				union extcon_property_value *prop_val)
{
	struct extcon_cable *cable;
	unsigned long flags;
	int index, ret = 0;

	*prop_val = (union extcon_property_value)(0);

	if (!edev)
		return -EINVAL;

	/* Check whether the property is supported or not */
	if (!is_extcon_property_supported(id, prop))
		return -EINVAL;

	/* Find the cable index of external connector by using id */
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	spin_lock_irqsave(&edev->lock, flags);

646 647 648 649 650 651
	/* Check whether the property is available or not. */
	if (!is_extcon_property_capability(edev, id, index, prop)) {
		spin_unlock_irqrestore(&edev->lock, flags);
		return -EPERM;
	}

652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
	/*
	 * Check whether the external connector is attached.
	 * If external connector is detached, the user can not
	 * get the property value.
	 */
	if (!is_extcon_attached(edev, index)) {
		spin_unlock_irqrestore(&edev->lock, flags);
		return 0;
	}

	cable = &edev->cables[index];

	/* Get the property value according to extcon type */
	switch (prop) {
	case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
		*prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
		break;
	case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
		*prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
		break;
	case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
		*prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
		break;
	case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
		*prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
		break;
	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
}
EXPORT_SYMBOL_GPL(extcon_get_property);

/**
690 691 692 693 694
 * extcon_set_property() - Set the property value of an external connector.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @prop:	the property id indicating an extcon property
 * @prop_val:	the pointer including the new value of extcon property
695
 *
696 697
 * Note that each property should be included in the list of supported
 * properties according to the extcon type.
698
 *
699
 * Returns 0 if success or error number if fail.
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
 */
int extcon_set_property(struct extcon_dev *edev, unsigned int id,
				unsigned int prop,
				union extcon_property_value prop_val)
{
	struct extcon_cable *cable;
	unsigned long flags;
	int index, ret = 0;

	if (!edev)
		return -EINVAL;

	/* Check whether the property is supported or not */
	if (!is_extcon_property_supported(id, prop))
		return -EINVAL;

	/* Find the cable index of external connector by using id */
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	spin_lock_irqsave(&edev->lock, flags);

723 724 725 726 727 728
	/* Check whether the property is available or not. */
	if (!is_extcon_property_capability(edev, id, index, prop)) {
		spin_unlock_irqrestore(&edev->lock, flags);
		return -EPERM;
	}

729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
	cable = &edev->cables[index];

	/* Set the property value according to extcon type */
	switch (prop) {
	case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
		cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
		break;
	case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
		cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
		break;
	case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
		cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
		break;
	case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
		cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
}
EXPORT_SYMBOL_GPL(extcon_set_property);

756
/**
757 758
 * extcon_set_property_sync() - Set property of an external connector with sync.
 * @prop_val:	the pointer including the new value of extcon property
759
 *
760 761 762
 * Note that when setting the property value of external connector,
 * the external connector should be attached. The each property should
 * be included in the list of supported properties according to extcon type.
763
 *
764
 * Returns 0 if success or error number if fail.
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
 */
int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
				unsigned int prop,
				union extcon_property_value prop_val)
{
	int ret;

	ret = extcon_set_property(edev, id, prop, prop_val);
	if (ret < 0)
		return ret;

	return extcon_sync(edev, id);
}
EXPORT_SYMBOL_GPL(extcon_set_property_sync);

780
/**
781 782 783 784 785
 * extcon_get_property_capability() - Get the capability of the property
 *					for an external connector.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @prop:	the property id indicating an extcon property
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
 *
 * Returns 1 if the property is available or 0 if not available.
 */
int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
					unsigned int prop)
{
	int index;

	if (!edev)
		return -EINVAL;

	/* Check whether the property is supported or not */
	if (!is_extcon_property_supported(id, prop))
		return -EINVAL;

	/* Find the cable index of external connector by using id */
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	return is_extcon_property_capability(edev, id, index, prop);
}
EXPORT_SYMBOL_GPL(extcon_get_property_capability);

/**
811 812 813 814 815
 * extcon_set_property_capability() - Set the capability of the property
 *					for an external connector.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @prop:	the property id indicating an extcon property
816
 *
817 818 819
 * Note that this function set the capability of the property
 * for an external connector in order to mark the bit in capability
 * bitmap which mean the available state of the property.
820
 *
821
 * Returns 0 if success or error number if fail.
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
 */
int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
					unsigned int prop)
{
	struct extcon_cable *cable;
	int index, type, ret = 0;

	if (!edev)
		return -EINVAL;

	/* Check whether the property is supported or not. */
	if (!is_extcon_property_supported(id, prop))
		return -EINVAL;

	/* Find the cable index of external connector by using id. */
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	type = get_extcon_type(prop);
	if (type < 0)
		return type;

	cable = &edev->cables[index];

	switch (type) {
	case EXTCON_TYPE_USB:
		__set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
		break;
	case EXTCON_TYPE_CHG:
		__set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
		break;
	case EXTCON_TYPE_JACK:
		__set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
		break;
	case EXTCON_TYPE_DISP:
		__set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(extcon_set_property_capability);

868
/**
869 870 871 872
 * extcon_get_extcon_dev() - Get the extcon device instance from the name.
 * @extcon_name:	the extcon name provided with extcon_dev_register()
 *
 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
873 874 875 876 877
 */
struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
{
	struct extcon_dev *sd;

878 879 880
	if (!extcon_name)
		return ERR_PTR(-EINVAL);

881 882 883 884 885 886 887 888 889 890 891 892 893
	mutex_lock(&extcon_dev_list_lock);
	list_for_each_entry(sd, &extcon_dev_list, entry) {
		if (!strcmp(sd->name, extcon_name))
			goto out;
	}
	sd = NULL;
out:
	mutex_unlock(&extcon_dev_list_lock);
	return sd;
}
EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);

/**
894 895 896 897 898
 * extcon_register_notifier() - Register a notifier block to get notified by
 *				any state changes from the extcon.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @nb:		a notifier block to be registered
899 900
 *
 * Note that the second parameter given to the callback of nb (val) is
901 902 903 904
 * the current state of an external connector and the third pameter
 * is the pointer of extcon device.
 *
 * Returns 0 if success or error number if fail.
905
 */
906
int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
907
			     struct notifier_block *nb)
908
{
909
	unsigned long flags;
910
	int ret, idx = -EINVAL;
911

912
	if (!edev || !nb)
913 914
		return -EINVAL;

915 916 917
	idx = find_cable_index_by_id(edev, id);
	if (idx < 0)
		return idx;
918

919 920 921
	spin_lock_irqsave(&edev->lock, flags);
	ret = raw_notifier_chain_register(&edev->nh[idx], nb);
	spin_unlock_irqrestore(&edev->lock, flags);
922 923

	return ret;
924 925 926 927
}
EXPORT_SYMBOL_GPL(extcon_register_notifier);

/**
928 929 930 931 932 933
 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
 * @edev:	the extcon device
 * @id:		the unique id indicating an external connector
 * @nb:		a notifier block to be registered
 *
 * Returns 0 if success or error number if fail.
934
 */
935
int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
936
				struct notifier_block *nb)
937
{
938
	unsigned long flags;
939 940
	int ret, idx;

941 942 943
	if (!edev || !nb)
		return -EINVAL;

944
	idx = find_cable_index_by_id(edev, id);
945 946
	if (idx < 0)
		return idx;
947 948

	spin_lock_irqsave(&edev->lock, flags);
949
	ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
950 951 952
	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
953 954 955
}
EXPORT_SYMBOL_GPL(extcon_unregister_notifier);

956
/**
957 958 959
 * extcon_register_notifier_all() - Register a notifier block for all connectors.
 * @edev:	the extcon device
 * @nb:		a notifier block to be registered
960
 *
961 962
 * Note that this function registers a notifier block in order to receive
 * the state change of all supported external connectors from extcon device.
963
 * And the second parameter given to the callback of nb (val) is
964
 * the current state and the third pameter is the pointer of extcon device.
965
 *
966
 * Returns 0 if success or error number if fail.
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
 */
int extcon_register_notifier_all(struct extcon_dev *edev,
				struct notifier_block *nb)
{
	unsigned long flags;
	int ret;

	if (!edev || !nb)
		return -EINVAL;

	spin_lock_irqsave(&edev->lock, flags);
	ret = raw_notifier_chain_register(&edev->nh_all, nb);
	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
}
EXPORT_SYMBOL_GPL(extcon_register_notifier_all);

/**
 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
987 988
 * @edev:	the extcon device
 * @nb:		a notifier block to be registered
989
 *
990
 * Returns 0 if success or error number if fail.
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
 */
int extcon_unregister_notifier_all(struct extcon_dev *edev,
				struct notifier_block *nb)
{
	unsigned long flags;
	int ret;

	if (!edev || !nb)
		return -EINVAL;

	spin_lock_irqsave(&edev->lock, flags);
	ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
}
EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);

1009 1010 1011 1012
static struct attribute *extcon_attrs[] = {
	&dev_attr_state.attr,
	&dev_attr_name.attr,
	NULL,
1013
};
1014
ATTRIBUTE_GROUPS(extcon);
1015 1016 1017 1018 1019 1020 1021

static int create_extcon_class(void)
{
	if (!extcon_class) {
		extcon_class = class_create(THIS_MODULE, "extcon");
		if (IS_ERR(extcon_class))
			return PTR_ERR(extcon_class);
1022
		extcon_class->dev_groups = extcon_groups;
1023 1024 1025 1026 1027 1028 1029 1030 1031
	}

	return 0;
}

static void extcon_dev_release(struct device *dev)
{
}

1032
static const char *muex_name = "mutually_exclusive";
1033 1034 1035 1036
static void dummy_sysfs_dev_release(struct device *dev)
{
}

1037 1038
/*
 * extcon_dev_allocate() - Allocate the memory of extcon device.
1039 1040
 * @supported_cable:	the array of the supported external connectors
 *			ending with EXTCON_NONE.
1041
 *
1042 1043
 * Note that this function allocates the memory for extcon device 
 * and initialize default setting for the extcon device.
1044
 *
1045 1046
 * Returns the pointer memory of allocated extcon_dev if success
 * or ERR_PTR(err) if fail.
1047
 */
1048
struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1049 1050 1051
{
	struct extcon_dev *edev;

1052 1053 1054
	if (!supported_cable)
		return ERR_PTR(-EINVAL);

1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
	if (!edev)
		return ERR_PTR(-ENOMEM);

	edev->max_supported = 0;
	edev->supported_cable = supported_cable;

	return edev;
}

/*
 * extcon_dev_free() - Free the memory of extcon device.
1067
 * @edev:	the extcon device
1068 1069 1070 1071 1072 1073 1074
 */
void extcon_dev_free(struct extcon_dev *edev)
{
	kfree(edev);
}
EXPORT_SYMBOL_GPL(extcon_dev_free);

1075
/**
1076 1077
 * extcon_dev_register() - Register an new extcon device
 * @edev:	the extcon device to be registered
1078 1079 1080 1081
 *
 * Among the members of edev struct, please set the "user initializing data"
 * do not set the values of "internal data", which are initialized by
 * this function.
1082 1083 1084 1085 1086 1087
 *
 * Note that before calling this funciton, have to allocate the memory
 * of an extcon device by using the extcon_dev_allocate(). And the extcon
 * dev should include the supported_cable information.
 *
 * Returns 0 if success or error number if fail.
1088
 */
1089
int extcon_dev_register(struct extcon_dev *edev)
1090
{
1091
	int ret, index = 0;
1092
	static atomic_t edev_no = ATOMIC_INIT(-1);
1093 1094 1095 1096 1097 1098 1099

	if (!extcon_class) {
		ret = create_extcon_class();
		if (ret < 0)
			return ret;
	}

1100
	if (!edev || !edev->supported_cable)
1101 1102 1103
		return -EINVAL;

	for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1104

1105
	edev->max_supported = index;
1106
	if (index > SUPPORTED_CABLE_MAX) {
1107 1108
		dev_err(&edev->dev,
			"exceed the maximum number of supported cables\n");
1109 1110 1111
		return -EINVAL;
	}

1112 1113
	edev->dev.class = extcon_class;
	edev->dev.release = extcon_dev_release;
1114

1115
	edev->name = dev_name(edev->dev.parent);
1116 1117 1118 1119 1120
	if (IS_ERR_OR_NULL(edev->name)) {
		dev_err(&edev->dev,
			"extcon device name is null\n");
		return -EINVAL;
	}
1121 1122
	dev_set_name(&edev->dev, "extcon%lu",
			(unsigned long)atomic_inc_return(&edev_no));
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159

	if (edev->max_supported) {
		char buf[10];
		char *str;
		struct extcon_cable *cable;

		edev->cables = kzalloc(sizeof(struct extcon_cable) *
				       edev->max_supported, GFP_KERNEL);
		if (!edev->cables) {
			ret = -ENOMEM;
			goto err_sysfs_alloc;
		}
		for (index = 0; index < edev->max_supported; index++) {
			cable = &edev->cables[index];

			snprintf(buf, 10, "cable.%d", index);
			str = kzalloc(sizeof(char) * (strlen(buf) + 1),
				      GFP_KERNEL);
			if (!str) {
				for (index--; index >= 0; index--) {
					cable = &edev->cables[index];
					kfree(cable->attr_g.name);
				}
				ret = -ENOMEM;

				goto err_alloc_cables;
			}
			strcpy(str, buf);

			cable->edev = edev;
			cable->cable_index = index;
			cable->attrs[0] = &cable->attr_name.attr;
			cable->attrs[1] = &cable->attr_state.attr;
			cable->attrs[2] = NULL;
			cable->attr_g.name = str;
			cable->attr_g.attrs = cable->attrs;

1160
			sysfs_attr_init(&cable->attr_name.attr);
1161 1162 1163 1164
			cable->attr_name.attr.name = "name";
			cable->attr_name.attr.mode = 0444;
			cable->attr_name.show = cable_name_show;

1165
			sysfs_attr_init(&cable->attr_state.attr);
1166
			cable->attr_state.attr.name = "state";
1167
			cable->attr_state.attr.mode = 0444;
1168 1169 1170 1171
			cable->attr_state.show = cable_state_show;
		}
	}

1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
	if (edev->max_supported && edev->mutually_exclusive) {
		char buf[80];
		char *name;

		/* Count the size of mutually_exclusive array */
		for (index = 0; edev->mutually_exclusive[index]; index++)
			;

		edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
					   (index + 1), GFP_KERNEL);
		if (!edev->attrs_muex) {
			ret = -ENOMEM;
			goto err_muex;
		}

		edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
					     index, GFP_KERNEL);
		if (!edev->d_attrs_muex) {
			ret = -ENOMEM;
			kfree(edev->attrs_muex);
			goto err_muex;
		}

		for (index = 0; edev->mutually_exclusive[index]; index++) {
			sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
			name = kzalloc(sizeof(char) * (strlen(buf) + 1),
				       GFP_KERNEL);
			if (!name) {
				for (index--; index >= 0; index--) {
					kfree(edev->d_attrs_muex[index].attr.
					      name);
				}
				kfree(edev->d_attrs_muex);
				kfree(edev->attrs_muex);
				ret = -ENOMEM;
				goto err_muex;
			}
			strcpy(name, buf);
1210
			sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
			edev->d_attrs_muex[index].attr.name = name;
			edev->d_attrs_muex[index].attr.mode = 0000;
			edev->attrs_muex[index] = &edev->d_attrs_muex[index]
							.attr;
		}
		edev->attr_g_muex.name = muex_name;
		edev->attr_g_muex.attrs = edev->attrs_muex;

	}

1221 1222 1223
	if (edev->max_supported) {
		edev->extcon_dev_type.groups =
			kzalloc(sizeof(struct attribute_group *) *
1224
				(edev->max_supported + 2), GFP_KERNEL);
1225 1226 1227 1228 1229
		if (!edev->extcon_dev_type.groups) {
			ret = -ENOMEM;
			goto err_alloc_groups;
		}

1230
		edev->extcon_dev_type.name = dev_name(&edev->dev);
1231 1232 1233 1234 1235
		edev->extcon_dev_type.release = dummy_sysfs_dev_release;

		for (index = 0; index < edev->max_supported; index++)
			edev->extcon_dev_type.groups[index] =
				&edev->cables[index].attr_g;
1236 1237 1238
		if (edev->mutually_exclusive)
			edev->extcon_dev_type.groups[index] =
				&edev->attr_g_muex;
1239

1240
		edev->dev.type = &edev->extcon_dev_type;
1241 1242
	}

1243
	ret = device_register(&edev->dev);
1244
	if (ret) {
1245
		put_device(&edev->dev);
1246 1247 1248
		goto err_dev;
	}

1249
	spin_lock_init(&edev->lock);
1250 1251
	edev->nh = devm_kcalloc(&edev->dev, edev->max_supported,
				sizeof(*edev->nh), GFP_KERNEL);
1252 1253 1254 1255 1256 1257 1258
	if (!edev->nh) {
		ret = -ENOMEM;
		goto err_dev;
	}

	for (index = 0; index < edev->max_supported; index++)
		RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1259

1260 1261
	RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);

1262
	dev_set_drvdata(&edev->dev, edev);
1263
	edev->state = 0;
1264 1265 1266 1267 1268

	mutex_lock(&extcon_dev_list_lock);
	list_add(&edev->entry, &extcon_dev_list);
	mutex_unlock(&extcon_dev_list_lock);

1269 1270 1271
	return 0;

err_dev:
1272 1273 1274
	if (edev->max_supported)
		kfree(edev->extcon_dev_type.groups);
err_alloc_groups:
1275 1276 1277 1278 1279 1280 1281
	if (edev->max_supported && edev->mutually_exclusive) {
		for (index = 0; edev->mutually_exclusive[index]; index++)
			kfree(edev->d_attrs_muex[index].attr.name);
		kfree(edev->d_attrs_muex);
		kfree(edev->attrs_muex);
	}
err_muex:
1282 1283 1284 1285 1286 1287
	for (index = 0; index < edev->max_supported; index++)
		kfree(edev->cables[index].attr_g.name);
err_alloc_cables:
	if (edev->max_supported)
		kfree(edev->cables);
err_sysfs_alloc:
1288 1289 1290 1291 1292 1293
	return ret;
}
EXPORT_SYMBOL_GPL(extcon_dev_register);

/**
 * extcon_dev_unregister() - Unregister the extcon device.
1294
 * @edev:	the extcon device to be unregistered.
1295 1296 1297 1298 1299 1300
 *
 * Note that this does not call kfree(edev) because edev was not allocated
 * by this class.
 */
void extcon_dev_unregister(struct extcon_dev *edev)
{
1301 1302
	int index;

1303 1304 1305
	if (!edev)
		return;

1306 1307 1308 1309
	mutex_lock(&extcon_dev_list_lock);
	list_del(&edev->entry);
	mutex_unlock(&extcon_dev_list_lock);

1310 1311 1312
	if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
		dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
				dev_name(&edev->dev));
1313 1314 1315
		return;
	}

1316 1317
	device_unregister(&edev->dev);

1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
	if (edev->mutually_exclusive && edev->max_supported) {
		for (index = 0; edev->mutually_exclusive[index];
				index++)
			kfree(edev->d_attrs_muex[index].attr.name);
		kfree(edev->d_attrs_muex);
		kfree(edev->attrs_muex);
	}

	for (index = 0; index < edev->max_supported; index++)
		kfree(edev->cables[index].attr_g.name);

	if (edev->max_supported) {
		kfree(edev->extcon_dev_type.groups);
		kfree(edev->cables);
	}

1334
	put_device(&edev->dev);
1335 1336 1337
}
EXPORT_SYMBOL_GPL(extcon_dev_unregister);

1338 1339
#ifdef CONFIG_OF
/*
1340 1341 1342
 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
 * @dev		: the instance to the given device
 * @index	: the index into list of extcon_dev
1343
 *
1344
 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1345 1346 1347 1348 1349 1350
 */
struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
{
	struct device_node *node;
	struct extcon_dev *edev;

1351 1352 1353
	if (!dev)
		return ERR_PTR(-EINVAL);

1354
	if (!dev->of_node) {
1355
		dev_dbg(dev, "device does not have a device node entry\n");
1356 1357 1358 1359 1360
		return ERR_PTR(-EINVAL);
	}

	node = of_parse_phandle(dev->of_node, "extcon", index);
	if (!node) {
1361 1362
		dev_dbg(dev, "failed to get phandle in %pOF node\n",
			dev->of_node);
1363 1364 1365
		return ERR_PTR(-ENODEV);
	}

1366 1367 1368 1369
	mutex_lock(&extcon_dev_list_lock);
	list_for_each_entry(edev, &extcon_dev_list, entry) {
		if (edev->dev.parent && edev->dev.parent->of_node == node) {
			mutex_unlock(&extcon_dev_list_lock);
1370
			of_node_put(node);
1371 1372
			return edev;
		}
1373
	}
1374
	mutex_unlock(&extcon_dev_list_lock);
1375
	of_node_put(node);
1376

1377
	return ERR_PTR(-EPROBE_DEFER);
1378 1379 1380 1381 1382 1383 1384 1385 1386
}
#else
struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
{
	return ERR_PTR(-ENOSYS);
}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);

1387 1388 1389 1390 1391 1392 1393 1394 1395
/**
 * extcon_get_edev_name() - Get the name of the extcon device.
 * @edev:	the extcon device
 */
const char *extcon_get_edev_name(struct extcon_dev *edev)
{
	return !edev ? NULL : edev->name;
}

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
static int __init extcon_class_init(void)
{
	return create_extcon_class();
}
module_init(extcon_class_init);

static void __exit extcon_class_exit(void)
{
	class_destroy(extcon_class);
}
module_exit(extcon_class_exit);

1408
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1409
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1410 1411
MODULE_DESCRIPTION("External Connector (extcon) framework");
MODULE_LICENSE("GPL v2");