summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/cros_ec_keyb.c
blob: 1f0d61b3c21346e2bbc0fe110bf32f150c5d4650 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
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
94
95
96
97
98
99
100
101
102
103
104
105
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
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
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
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
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
// SPDX-License-Identifier: GPL-2.0
// ChromeOS EC keyboard driver
//
// Copyright (C) 2012 Google, Inc.
//
// This driver uses the ChromeOS EC byte-level message-based protocol for
// communicating the keyboard state (which keys are pressed) from a keyboard EC
// to the AP over some bus (such as i2c, lpc, spi).  The EC does debouncing,
// but everything else (including deghosting) is done here.  The main
// motivation for this is to keep the EC firmware as simple as possible, since
// it cannot be easily upgraded and EC flash/IRAM space is relatively
// expensive.

#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sysrq.h>
#include <linux/input/matrix_keypad.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>

#include <asm/unaligned.h>

/*
 * @rows: Number of rows in the keypad
 * @cols: Number of columns in the keypad
 * @row_shift: log2 or number of rows, rounded up
 * @keymap_data: Matrix keymap data used to convert to keyscan values
 * @ghost_filter: true to enable the matrix key-ghosting filter
 * @valid_keys: bitmap of existing keys for each matrix column
 * @old_kb_state: bitmap of keys pressed last scan
 * @dev: Device pointer
 * @ec: Top level ChromeOS device to use to talk to EC
 * @idev: The input device for the matrix keys.
 * @bs_idev: The input device for non-matrix buttons and switches (or NULL).
 * @notifier: interrupt event notifier for transport devices
 */
struct cros_ec_keyb {
	unsigned int rows;
	unsigned int cols;
	int row_shift;
	const struct matrix_keymap_data *keymap_data;
	bool ghost_filter;
	uint8_t *valid_keys;
	uint8_t *old_kb_state;

	struct device *dev;
	struct cros_ec_device *ec;

	struct input_dev *idev;
	struct input_dev *bs_idev;
	struct notifier_block notifier;
};


/**
 * cros_ec_bs_map - Struct mapping Linux keycodes to EC button/switch bitmap
 * #defines
 *
 * @ev_type: The type of the input event to generate (e.g., EV_KEY).
 * @code: A linux keycode
 * @bit: A #define like EC_MKBP_POWER_BUTTON or EC_MKBP_LID_OPEN
 * @inverted: If the #define and EV_SW have opposite meanings, this is true.
 *            Only applicable to switches.
 */
struct cros_ec_bs_map {
	unsigned int ev_type;
	unsigned int code;
	u8 bit;
	bool inverted;
};

/* cros_ec_keyb_bs - Map EC button/switch #defines into kernel ones */
static const struct cros_ec_bs_map cros_ec_keyb_bs[] = {
	/* Buttons */
	{
		.ev_type	= EV_KEY,
		.code		= KEY_POWER,
		.bit		= EC_MKBP_POWER_BUTTON,
	},
	{
		.ev_type	= EV_KEY,
		.code		= KEY_VOLUMEUP,
		.bit		= EC_MKBP_VOL_UP,
	},
	{
		.ev_type	= EV_KEY,
		.code		= KEY_VOLUMEDOWN,
		.bit		= EC_MKBP_VOL_DOWN,
	},

	/* Switches */
	{
		.ev_type	= EV_SW,
		.code		= SW_LID,
		.bit		= EC_MKBP_LID_OPEN,
		.inverted	= true,
	},
	{
		.ev_type	= EV_SW,
		.code		= SW_TABLET_MODE,
		.bit		= EC_MKBP_TABLET_MODE,
	},
};

/*
 * Returns true when there is at least one combination of pressed keys that
 * results in ghosting.
 */
static bool cros_ec_keyb_has_ghosting(struct cros_ec_keyb *ckdev, uint8_t *buf)
{
	int col1, col2, buf1, buf2;
	struct device *dev = ckdev->dev;
	uint8_t *valid_keys = ckdev->valid_keys;

	/*
	 * Ghosting happens if for any pressed key X there are other keys
	 * pressed both in the same row and column of X as, for instance,
	 * in the following diagram:
	 *
	 * . . Y . g .
	 * . . . . . .
	 * . . . . . .
	 * . . X . Z .
	 *
	 * In this case only X, Y, and Z are pressed, but g appears to be
	 * pressed too (see Wikipedia).
	 */
	for (col1 = 0; col1 < ckdev->cols; col1++) {
		buf1 = buf[col1] & valid_keys[col1];
		for (col2 = col1 + 1; col2 < ckdev->cols; col2++) {
			buf2 = buf[col2] & valid_keys[col2];
			if (hweight8(buf1 & buf2) > 1) {
				dev_dbg(dev, "ghost found at: B[%02d]:0x%02x & B[%02d]:0x%02x",
					col1, buf1, col2, buf2);
				return true;
			}
		}
	}

	return false;
}


/*
 * Compares the new keyboard state to the old one and produces key
 * press/release events accordingly.  The keyboard state is 13 bytes (one byte
 * per column)
 */
static void cros_ec_keyb_process(struct cros_ec_keyb *ckdev,
			 uint8_t *kb_state, int len)
{
	struct input_dev *idev = ckdev->idev;
	int col, row;
	int new_state;
	int old_state;

	if (ckdev->ghost_filter && cros_ec_keyb_has_ghosting(ckdev, kb_state)) {
		/*
		 * Simple-minded solution: ignore this state. The obvious
		 * improvement is to only ignore changes to keys involved in
		 * the ghosting, but process the other changes.
		 */
		dev_dbg(ckdev->dev, "ghosting found\n");
		return;
	}

	for (col = 0; col < ckdev->cols; col++) {
		for (row = 0; row < ckdev->rows; row++) {
			int pos = MATRIX_SCAN_CODE(row, col, ckdev->row_shift);
			const unsigned short *keycodes = idev->keycode;

			new_state = kb_state[col] & (1 << row);
			old_state = ckdev->old_kb_state[col] & (1 << row);
			if (new_state != old_state) {
				dev_dbg(ckdev->dev,
					"changed: [r%d c%d]: byte %02x\n",
					row, col, new_state);

				input_event(idev, EV_MSC, MSC_SCAN, pos);
				input_report_key(idev, keycodes[pos],
						 new_state);
			}
		}
		ckdev->old_kb_state[col] = kb_state[col];
	}
	input_sync(ckdev->idev);
}

/**
 * cros_ec_keyb_report_bs - Report non-matrixed buttons or switches
 *
 * This takes a bitmap of buttons or switches from the EC and reports events,
 * syncing at the end.
 *
 * @ckdev: The keyboard device.
 * @ev_type: The input event type (e.g., EV_KEY).
 * @mask: A bitmap of buttons from the EC.
 */
static void cros_ec_keyb_report_bs(struct cros_ec_keyb *ckdev,
				   unsigned int ev_type, u32 mask)

{
	struct input_dev *idev = ckdev->bs_idev;
	int i;

	for (i = 0; i < ARRAY_SIZE(cros_ec_keyb_bs); i++) {
		const struct cros_ec_bs_map *map = &cros_ec_keyb_bs[i];

		if (map->ev_type != ev_type)
			continue;

		input_event(idev, ev_type, map->code,
			    !!(mask & BIT(map->bit)) ^ map->inverted);
	}
	input_sync(idev);
}

static int cros_ec_keyb_work(struct notifier_block *nb,
			     unsigned long queued_during_suspend, void *_notify)
{
	struct cros_ec_keyb *ckdev = container_of(nb, struct cros_ec_keyb,
						  notifier);
	u32 val;
	unsigned int ev_type;

	/*
	 * If not wake enabled, discard key state changes during
	 * suspend. Switches will be re-checked in
	 * cros_ec_keyb_resume() to be sure nothing is lost.
	 */
	if (queued_during_suspend && !device_may_wakeup(ckdev->dev))
		return NOTIFY_OK;

	switch (ckdev->ec->event_data.event_type) {
	case EC_MKBP_EVENT_KEY_MATRIX:
		pm_wakeup_event(ckdev->dev, 0);

		if (ckdev->ec->event_size != ckdev->cols) {
			dev_err(ckdev->dev,
				"Discarded incomplete key matrix event.\n");
			return NOTIFY_OK;
		}

		cros_ec_keyb_process(ckdev,
				     ckdev->ec->event_data.data.key_matrix,
				     ckdev->ec->event_size);
		break;

	case EC_MKBP_EVENT_SYSRQ:
		pm_wakeup_event(ckdev->dev, 0);

		val = get_unaligned_le32(&ckdev->ec->event_data.data.sysrq);
		dev_dbg(ckdev->dev, "sysrq code from EC: %#x\n", val);
		handle_sysrq(val);
		break;

	case EC_MKBP_EVENT_BUTTON:
	case EC_MKBP_EVENT_SWITCH:
		pm_wakeup_event(ckdev->dev, 0);

		if (ckdev->ec->event_data.event_type == EC_MKBP_EVENT_BUTTON) {
			val = get_unaligned_le32(
					&ckdev->ec->event_data.data.buttons);
			ev_type = EV_KEY;
		} else {
			val = get_unaligned_le32(
					&ckdev->ec->event_data.data.switches);
			ev_type = EV_SW;
		}
		cros_ec_keyb_report_bs(ckdev, ev_type, val);
		break;

	default:
		return NOTIFY_DONE;
	}

	return NOTIFY_OK;
}

/*
 * Walks keycodes flipping bit in buffer COLUMNS deep where bit is ROW.  Used by
 * ghosting logic to ignore NULL or virtual keys.
 */
static void cros_ec_keyb_compute_valid_keys(struct cros_ec_keyb *ckdev)
{
	int row, col;
	int row_shift = ckdev->row_shift;
	unsigned short *keymap = ckdev->idev->keycode;
	unsigned short code;

	BUG_ON(ckdev->idev->keycodesize != sizeof(*keymap));

	for (col = 0; col < ckdev->cols; col++) {
		for (row = 0; row < ckdev->rows; row++) {
			code = keymap[MATRIX_SCAN_CODE(row, col, row_shift)];
			if (code && (code != KEY_BATTERY))
				ckdev->valid_keys[col] |= 1 << row;
		}
		dev_dbg(ckdev->dev, "valid_keys[%02d] = 0x%02x\n",
			col, ckdev->valid_keys[col]);
	}
}

/**
 * cros_ec_keyb_info - Wrap the EC command EC_CMD_MKBP_INFO
 *
 * This wraps the EC_CMD_MKBP_INFO, abstracting out all of the marshalling and
 * unmarshalling and different version nonsense into something simple.
 *
 * @ec_dev: The EC device
 * @info_type: Either EC_MKBP_INFO_SUPPORTED or EC_MKBP_INFO_CURRENT.
 * @event_type: Either EC_MKBP_EVENT_BUTTON or EC_MKBP_EVENT_SWITCH.  Actually
 *              in some cases this could be EC_MKBP_EVENT_KEY_MATRIX or
 *              EC_MKBP_EVENT_HOST_EVENT too but we don't use in this driver.
 * @result: Where we'll store the result; a union
 * @result_size: The size of the result.  Expected to be the size of one of
 *               the elements in the union.
 *
 * Returns 0 if no error or -error upon error.
 */
static int cros_ec_keyb_info(struct cros_ec_device *ec_dev,
			     enum ec_mkbp_info_type info_type,
			     enum ec_mkbp_event event_type,
			     union ec_response_get_next_data *result,
			     size_t result_size)
{
	struct ec_params_mkbp_info *params;
	struct cros_ec_command *msg;
	int ret;

	msg = kzalloc(sizeof(*msg) + max_t(size_t, result_size,
					   sizeof(*params)), GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	msg->command = EC_CMD_MKBP_INFO;
	msg->version = 1;
	msg->outsize = sizeof(*params);
	msg->insize = result_size;
	params = (struct ec_params_mkbp_info *)msg->data;
	params->info_type = info_type;
	params->event_type = event_type;

	ret = cros_ec_cmd_xfer_status(ec_dev, msg);
	if (ret == -ENOPROTOOPT) {
		/* With older ECs we just return 0 for everything */
		memset(result, 0, result_size);
		ret = 0;
	} else if (ret < 0) {
		dev_warn(ec_dev->dev, "Transfer error %d/%d: %d\n",
			 (int)info_type, (int)event_type, ret);
	} else if (ret != result_size) {
		dev_warn(ec_dev->dev, "Wrong size %d/%d: %d != %zu\n",
			 (int)info_type, (int)event_type,
			 ret, result_size);
		ret = -EPROTO;
	} else {
		memcpy(result, msg->data, result_size);
		ret = 0;
	}

	kfree(msg);

	return ret;
}

/**
 * cros_ec_keyb_query_switches - Query the state of switches and report
 *
 * This will ask the EC about the current state of switches and report to the
 * kernel.  Note that we don't query for buttons because they are more
 * transitory and we'll get an update on the next release / press.
 *
 * @ckdev: The keyboard device
 *
 * Returns 0 if no error or -error upon error.
 */
static int cros_ec_keyb_query_switches(struct cros_ec_keyb *ckdev)
{
	struct cros_ec_device *ec_dev = ckdev->ec;
	union ec_response_get_next_data event_data = {};
	int ret;

	ret = cros_ec_keyb_info(ec_dev, EC_MKBP_INFO_CURRENT,
				EC_MKBP_EVENT_SWITCH, &event_data,
				sizeof(event_data.switches));
	if (ret)
		return ret;

	cros_ec_keyb_report_bs(ckdev, EV_SW,
			       get_unaligned_le32(&event_data.switches));

	return 0;
}

/**
 * cros_ec_keyb_resume - Resume the keyboard
 *
 * We use the resume notification as a chance to query the EC for switches.
 *
 * @dev: The keyboard device
 *
 * Returns 0 if no error or -error upon error.
 */
static __maybe_unused int cros_ec_keyb_resume(struct device *dev)
{
	struct cros_ec_keyb *ckdev = dev_get_drvdata(dev);

	if (ckdev->bs_idev)
		return cros_ec_keyb_query_switches(ckdev);

	return 0;
}

/**
 * cros_ec_keyb_register_bs - Register non-matrix buttons/switches
 *
 * Handles all the bits of the keyboard driver related to non-matrix buttons
 * and switches, including asking the EC about which are present and telling
 * the kernel to expect them.
 *
 * If this device has no support for buttons and switches we'll return no error
 * but the ckdev->bs_idev will remain NULL when this function exits.
 *
 * @ckdev: The keyboard device
 *
 * Returns 0 if no error or -error upon error.
 */
static int cros_ec_keyb_register_bs(struct cros_ec_keyb *ckdev)
{
	struct cros_ec_device *ec_dev = ckdev->ec;
	struct device *dev = ckdev->dev;
	struct input_dev *idev;
	union ec_response_get_next_data event_data = {};
	const char *phys;
	u32 buttons;
	u32 switches;
	int ret;
	int i;

	ret = cros_ec_keyb_info(ec_dev, EC_MKBP_INFO_SUPPORTED,
				EC_MKBP_EVENT_BUTTON, &event_data,
				sizeof(event_data.buttons));
	if (ret)
		return ret;
	buttons = get_unaligned_le32(&event_data.buttons);

	ret = cros_ec_keyb_info(ec_dev, EC_MKBP_INFO_SUPPORTED,
				EC_MKBP_EVENT_SWITCH, &event_data,
				sizeof(event_data.switches));
	if (ret)
		return ret;
	switches = get_unaligned_le32(&event_data.switches);

	if (!buttons && !switches)
		return 0;

	/*
	 * We call the non-matrix buttons/switches 'input1', if present.
	 * Allocate phys before input dev, to ensure correct tear-down
	 * ordering.
	 */
	phys = devm_kasprintf(dev, GFP_KERNEL, "%s/input1", ec_dev->phys_name);
	if (!phys)
		return -ENOMEM;

	idev = devm_input_allocate_device(dev);
	if (!idev)
		return -ENOMEM;

	idev->name = "cros_ec_buttons";
	idev->phys = phys;
	__set_bit(EV_REP, idev->evbit);

	idev->id.bustype = BUS_VIRTUAL;
	idev->id.version = 1;
	idev->id.product = 0;
	idev->dev.parent = dev;

	input_set_drvdata(idev, ckdev);
	ckdev->bs_idev = idev;

	for (i = 0; i < ARRAY_SIZE(cros_ec_keyb_bs); i++) {
		const struct cros_ec_bs_map *map = &cros_ec_keyb_bs[i];

		if ((map->ev_type == EV_KEY && (buttons & BIT(map->bit))) ||
		    (map->ev_type == EV_SW && (switches & BIT(map->bit))))
			input_set_capability(idev, map->ev_type, map->code);
	}

	ret = cros_ec_keyb_query_switches(ckdev);
	if (ret) {
		dev_err(dev, "cannot query switches\n");
		return ret;
	}

	ret = input_register_device(ckdev->bs_idev);
	if (ret) {
		dev_err(dev, "cannot register input device\n");
		return ret;
	}

	return 0;
}

/**
 * cros_ec_keyb_register_bs - Register matrix keys
 *
 * Handles all the bits of the keyboard driver related to matrix keys.
 *
 * @ckdev: The keyboard device
 *
 * Returns 0 if no error or -error upon error.
 */
static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev)
{
	struct cros_ec_device *ec_dev = ckdev->ec;
	struct device *dev = ckdev->dev;
	struct input_dev *idev;
	const char *phys;
	int err;

	err = matrix_keypad_parse_properties(dev, &ckdev->rows, &ckdev->cols);
	if (err)
		return err;

	ckdev->valid_keys = devm_kzalloc(dev, ckdev->cols, GFP_KERNEL);
	if (!ckdev->valid_keys)
		return -ENOMEM;

	ckdev->old_kb_state = devm_kzalloc(dev, ckdev->cols, GFP_KERNEL);
	if (!ckdev->old_kb_state)
		return -ENOMEM;

	/*
	 * We call the keyboard matrix 'input0'. Allocate phys before input
	 * dev, to ensure correct tear-down ordering.
	 */
	phys = devm_kasprintf(dev, GFP_KERNEL, "%s/input0", ec_dev->phys_name);
	if (!phys)
		return -ENOMEM;

	idev = devm_input_allocate_device(dev);
	if (!idev)
		return -ENOMEM;

	idev->name = CROS_EC_DEV_NAME;
	idev->phys = phys;
	__set_bit(EV_REP, idev->evbit);

	idev->id.bustype = BUS_VIRTUAL;
	idev->id.version = 1;
	idev->id.product = 0;
	idev->dev.parent = dev;

	ckdev->ghost_filter = of_property_read_bool(dev->of_node,
					"google,needs-ghost-filter");

	err = matrix_keypad_build_keymap(NULL, NULL, ckdev->rows, ckdev->cols,
					 NULL, idev);
	if (err) {
		dev_err(dev, "cannot build key matrix\n");
		return err;
	}

	ckdev->row_shift = get_count_order(ckdev->cols);

	input_set_capability(idev, EV_MSC, MSC_SCAN);
	input_set_drvdata(idev, ckdev);
	ckdev->idev = idev;
	cros_ec_keyb_compute_valid_keys(ckdev);

	err = input_register_device(ckdev->idev);
	if (err) {
		dev_err(dev, "cannot register input device\n");
		return err;
	}

	return 0;
}

static int cros_ec_keyb_probe(struct platform_device *pdev)
{
	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
	struct device *dev = &pdev->dev;
	struct cros_ec_keyb *ckdev;
	int err;

	if (!dev->of_node)
		return -ENODEV;

	ckdev = devm_kzalloc(dev, sizeof(*ckdev), GFP_KERNEL);
	if (!ckdev)
		return -ENOMEM;

	ckdev->ec = ec;
	ckdev->dev = dev;
	dev_set_drvdata(dev, ckdev);

	err = cros_ec_keyb_register_matrix(ckdev);
	if (err) {
		dev_err(dev, "cannot register matrix inputs: %d\n", err);
		return err;
	}

	err = cros_ec_keyb_register_bs(ckdev);
	if (err) {
		dev_err(dev, "cannot register non-matrix inputs: %d\n", err);
		return err;
	}

	ckdev->notifier.notifier_call = cros_ec_keyb_work;
	err = blocking_notifier_chain_register(&ckdev->ec->event_notifier,
					       &ckdev->notifier);
	if (err) {
		dev_err(dev, "cannot register notifier: %d\n", err);
		return err;
	}

	device_init_wakeup(ckdev->dev, true);
	return 0;
}

static int cros_ec_keyb_remove(struct platform_device *pdev)
{
	struct cros_ec_keyb *ckdev = dev_get_drvdata(&pdev->dev);

	blocking_notifier_chain_unregister(&ckdev->ec->event_notifier,
					   &ckdev->notifier);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id cros_ec_keyb_of_match[] = {
	{ .compatible = "google,cros-ec-keyb" },
	{},
};
MODULE_DEVICE_TABLE(of, cros_ec_keyb_of_match);
#endif

static SIMPLE_DEV_PM_OPS(cros_ec_keyb_pm_ops, NULL, cros_ec_keyb_resume);

static struct platform_driver cros_ec_keyb_driver = {
	.probe = cros_ec_keyb_probe,
	.remove = cros_ec_keyb_remove,
	.driver = {
		.name = "cros-ec-keyb",
		.of_match_table = of_match_ptr(cros_ec_keyb_of_match),
		.pm = &cros_ec_keyb_pm_ops,
	},
};

module_platform_driver(cros_ec_keyb_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ChromeOS EC keyboard driver");
MODULE_ALIAS("platform:cros-ec-keyb");