[deliverable/linux.git] / drivers / input / misc / rotary_encoder.c

/*
 * rotary_encoder.c
 *
 * (c) 2009 Daniel Mack <daniel@caiaq.de>
 * Copyright (C) 2011 Johan Hovold <jhovold@gmail.com>
 *
 * state machine code inspired by code from Tim Ruetz
 *
 * A generic driver for rotary encoders connected to GPIO lines.
 * See file:Documentation/input/rotary-encoder.txt for more information
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/property.h>

#define DRV_NAME "rotary-encoder"

struct rotary_encoder {
	struct input_dev *input;

	struct mutex access_mutex;

	u32 steps;
	u32 axis;
	bool relative_axis;
	bool rollover;

	unsigned int pos;

	struct gpio_desc *gpio_a;
	struct gpio_desc *gpio_b;

	unsigned int irq_a;
	unsigned int irq_b;

	bool armed;
	unsigned char dir;	/* 0 - clockwise, 1 - CCW */

	char last_stable;
};

static int rotary_encoder_get_state(struct rotary_encoder *encoder)
{
	int a = !!gpiod_get_value_cansleep(encoder->gpio_a);
	int b = !!gpiod_get_value_cansleep(encoder->gpio_b);

	return ((a << 1) | b);
}

static void rotary_encoder_report_event(struct rotary_encoder *encoder)
{
	if (encoder->relative_axis) {
		input_report_rel(encoder->input,
				 encoder->axis, encoder->dir ? -1 : 1);
	} else {
		unsigned int pos = encoder->pos;

		if (encoder->dir) {
			/* turning counter-clockwise */
			if (encoder->rollover)
				pos += encoder->steps;
			if (pos)
				pos--;
		} else {
			/* turning clockwise */
			if (encoder->rollover || pos < encoder->steps)
				pos++;
		}

		if (encoder->rollover)
			pos %= encoder->steps;

		encoder->pos = pos;
		input_report_abs(encoder->input, encoder->axis, encoder->pos);
	}

	input_sync(encoder->input);
}

static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
{
	struct rotary_encoder *encoder = dev_id;
	int state;

	mutex_lock(&encoder->access_mutex);

	state = rotary_encoder_get_state(encoder);

	switch (state) {
	case 0x0:
		if (encoder->armed) {
			rotary_encoder_report_event(encoder);
			encoder->armed = false;
		}
		break;

	case 0x1:
	case 0x2:
		if (encoder->armed)
			encoder->dir = state - 1;
		break;

	case 0x3:
		encoder->armed = true;
		break;
	}

	mutex_unlock(&encoder->access_mutex);

	return IRQ_HANDLED;
}

static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
{
	struct rotary_encoder *encoder = dev_id;
	int state;

	mutex_lock(&encoder->access_mutex);

	state = rotary_encoder_get_state(encoder);

	switch (state) {
	case 0x00:
	case 0x03:
		if (state != encoder->last_stable) {
			rotary_encoder_report_event(encoder);
			encoder->last_stable = state;
		}
		break;

	case 0x01:
	case 0x02:
		encoder->dir = (encoder->last_stable + state) & 0x01;
		break;
	}

	mutex_unlock(&encoder->access_mutex);

	return IRQ_HANDLED;
}

static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id)
{
	struct rotary_encoder *encoder = dev_id;
	unsigned char sum;
	int state;

	mutex_lock(&encoder->access_mutex);

	state = rotary_encoder_get_state(encoder);

	/*
	 * We encode the previous and the current state using a byte.
	 * The previous state in the MSB nibble, the current state in the LSB
	 * nibble. Then use a table to decide the direction of the turn.
	 */
	sum = (encoder->last_stable << 4) + state;
	switch (sum) {
	case 0x31:
	case 0x10:
	case 0x02:
	case 0x23:
		encoder->dir = 0; /* clockwise */
		break;

	case 0x13:
	case 0x01:
	case 0x20:
	case 0x32:
		encoder->dir = 1; /* counter-clockwise */
		break;

	default:
		/*
		 * Ignore all other values. This covers the case when the
		 * state didn't change (a spurious interrupt) and the
		 * cases where the state changed by two steps, making it
		 * impossible to tell the direction.
		 *
		 * In either case, don't report any event and save the
		 * state for later.
		 */
		goto out;
	}

	rotary_encoder_report_event(encoder);

out:
	encoder->last_stable = state;
	mutex_unlock(&encoder->access_mutex);

	return IRQ_HANDLED;
}

static int rotary_encoder_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct rotary_encoder *encoder;
	struct input_dev *input;
	irq_handler_t handler;
	u32 steps_per_period;
	int err;

	encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL);
	if (!encoder)
		return -ENOMEM;

	mutex_init(&encoder->access_mutex);

	device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps);

	err = device_property_read_u32(dev, "rotary-encoder,steps-per-period",
				       &steps_per_period);
	if (err) {
		/*
		 * The 'half-period' property has been deprecated, you must
		 * use 'steps-per-period' and set an appropriate value, but
		 * we still need to parse it to maintain compatibility. If
		 * neither property is present we fall back to the one step
		 * per period behavior.
		 */
		steps_per_period = device_property_read_bool(dev,
					"rotary-encoder,half-period") ? 2 : 1;
	}

	encoder->rollover =
		device_property_read_bool(dev, "rotary-encoder,rollover");

	device_property_read_u32(dev, "linux,axis", &encoder->axis);
	encoder->relative_axis =
		device_property_read_bool(dev, "rotary-encoder,relative-axis");

	encoder->gpio_a = devm_gpiod_get_index(dev, NULL, 0, GPIOD_IN);
	if (IS_ERR(encoder->gpio_a)) {
		err = PTR_ERR(encoder->gpio_a);
		dev_err(dev, "unable to get GPIO at index 0: %d\n", err);
		return err;
	}

	encoder->irq_a = gpiod_to_irq(encoder->gpio_a);

	encoder->gpio_b = devm_gpiod_get_index(dev, NULL, 1, GPIOD_IN);
	if (IS_ERR(encoder->gpio_b)) {
		err = PTR_ERR(encoder->gpio_b);
		dev_err(dev, "unable to get GPIO at index 1: %d\n", err);
		return err;
	}

	encoder->irq_b = gpiod_to_irq(encoder->gpio_b);

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

	encoder->input = input;

	input->name = pdev->name;
	input->id.bustype = BUS_HOST;
	input->dev.parent = dev;

	if (encoder->relative_axis)
		input_set_capability(input, EV_REL, encoder->axis);
	else
		input_set_abs_params(input,
				     encoder->axis, 0, encoder->steps, 0, 1);

	switch (steps_per_period) {
	case 4:
		handler = &rotary_encoder_quarter_period_irq;
		encoder->last_stable = rotary_encoder_get_state(encoder);
		break;
	case 2:
		handler = &rotary_encoder_half_period_irq;
		encoder->last_stable = rotary_encoder_get_state(encoder);
		break;
	case 1:
		handler = &rotary_encoder_irq;
		break;
	default:
		dev_err(dev, "'%d' is not a valid steps-per-period value\n",
			steps_per_period);
		return -EINVAL;
	}

	err = devm_request_threaded_irq(dev, encoder->irq_a, NULL, handler,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
				IRQF_ONESHOT,
				DRV_NAME, encoder);
	if (err) {
		dev_err(dev, "unable to request IRQ %d\n", encoder->irq_a);
		return err;
	}

	err = devm_request_threaded_irq(dev, encoder->irq_b, NULL, handler,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
				IRQF_ONESHOT,
				DRV_NAME, encoder);
	if (err) {
		dev_err(dev, "unable to request IRQ %d\n", encoder->irq_b);
		return err;
	}

	err = input_register_device(input);
	if (err) {
		dev_err(dev, "failed to register input device\n");
		return err;
	}

	device_init_wakeup(dev,
			   device_property_read_bool(dev, "wakeup-source"));

	platform_set_drvdata(pdev, encoder);

	return 0;
}

static int __maybe_unused rotary_encoder_suspend(struct device *dev)
{
	struct rotary_encoder *encoder = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		enable_irq_wake(encoder->irq_a);
		enable_irq_wake(encoder->irq_b);
	}

	return 0;
}

static int __maybe_unused rotary_encoder_resume(struct device *dev)
{
	struct rotary_encoder *encoder = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		disable_irq_wake(encoder->irq_a);
		disable_irq_wake(encoder->irq_b);
	}

	return 0;
}

static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,
			 rotary_encoder_suspend, rotary_encoder_resume);

#ifdef CONFIG_OF
static const struct of_device_id rotary_encoder_of_match[] = {
	{ .compatible = "rotary-encoder", },
	{ },
};
MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);
#endif

static struct platform_driver rotary_encoder_driver = {
	.probe		= rotary_encoder_probe,
	.driver		= {
		.name	= DRV_NAME,
		.pm	= &rotary_encoder_pm_ops,
		.of_match_table = of_match_ptr(rotary_encoder_of_match),
	}
};
module_platform_driver(rotary_encoder_driver);

MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DESCRIPTION("GPIO rotary encoder driver");
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>, Johan Hovold");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
73969ff0 DM	1	/*
	2	* rotary_encoder.c
	3	*
	4	* (c) 2009 Daniel Mack <daniel@caiaq.de>
e70bdd41	5	* Copyright (C) 2011 Johan Hovold <jhovold@gmail.com>
73969ff0 DM	6	*
	7	* state machine code inspired by code from Tim Ruetz
	8	*
	9	* A generic driver for rotary encoders connected to GPIO lines.
395cf969	10	* See file:Documentation/input/rotary-encoder.txt for more information
73969ff0 DM	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
73969ff0 DM	19	#include <linux/interrupt.h>
	20	#include <linux/input.h>
	21	#include <linux/device.h>
	22	#include <linux/platform_device.h>
77a8f0ad	23	#include <linux/gpio/consumer.h>
5a0e3ad6	24	#include <linux/slab.h>
2e45e539	25	#include <linux/of.h>
47ec6e5a	26	#include <linux/pm.h>
a9e340dc	27	#include <linux/property.h>
73969ff0 DM	28
	29	#define DRV_NAME "rotary-encoder"
	30
	31	struct rotary_encoder {
73969ff0	32	struct input_dev *input;
a9e340dc	33
dee520e3	34	struct mutex access_mutex;
bd3ce655	35
a9e340dc DT	36	u32 steps;
	37	u32 axis;
	38	bool relative_axis;
	39	bool rollover;
	40
bd3ce655 HS	41	unsigned int pos;
bd3ce655 HS	42
77a8f0ad DT	43	struct gpio_desc *gpio_a;
	44	struct gpio_desc *gpio_b;
	45
bd3ce655 HS	46	unsigned int irq_a;
	47	unsigned int irq_b;
	48
	49	bool armed;
	50	unsigned char dir; /* 0 - clockwise, 1 - CCW */
e70bdd41 JH	51
e70bdd41 JH	52	char last_stable;
73969ff0 DM	53	};
73969ff0 DM	54
77a8f0ad	55	static int rotary_encoder_get_state(struct rotary_encoder *encoder)
73969ff0	56	{
77a8f0ad DT	57	int a = !!gpiod_get_value_cansleep(encoder->gpio_a);
77a8f0ad DT	58	int b = !!gpiod_get_value_cansleep(encoder->gpio_b);
73969ff0	59
521a8f5c JH	60	return ((a << 1) \| b);
521a8f5c JH	61	}
73969ff0	62
521a8f5c JH	63	static void rotary_encoder_report_event(struct rotary_encoder *encoder)
521a8f5c JH	64	{
a9e340dc	65	if (encoder->relative_axis) {
521a8f5c	66	input_report_rel(encoder->input,
a9e340dc	67	encoder->axis, encoder->dir ? -1 : 1);
521a8f5c JH	68	} else {
	69	unsigned int pos = encoder->pos;
	70
	71	if (encoder->dir) {
	72	/* turning counter-clockwise */
a9e340dc DT	73	if (encoder->rollover)
a9e340dc DT	74	pos += encoder->steps;
521a8f5c JH	75	if (pos)
	76	pos--;
	77	} else {
	78	/* turning clockwise */
a9e340dc	79	if (encoder->rollover \|\| pos < encoder->steps)
521a8f5c	80	pos++;
73969ff0	81	}
73969ff0	82
a9e340dc DT	83	if (encoder->rollover)
a9e340dc DT	84	pos %= encoder->steps;
521a8f5c JH	85
521a8f5c JH	86	encoder->pos = pos;
a9e340dc	87	input_report_abs(encoder->input, encoder->axis, encoder->pos);
521a8f5c JH	88	}
	89
	90	input_sync(encoder->input);
	91	}
	92
	93	static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
	94	{
	95	struct rotary_encoder *encoder = dev_id;
	96	int state;
	97
dee520e3 TT	98	mutex_lock(&encoder->access_mutex);
dee520e3 TT	99
77a8f0ad	100	state = rotary_encoder_get_state(encoder);
521a8f5c JH	101
	102	switch (state) {
	103	case 0x0:
	104	if (encoder->armed) {
	105	rotary_encoder_report_event(encoder);
	106	encoder->armed = false;
	107	}
73969ff0 DM	108	break;
	109
	110	case 0x1:
	111	case 0x2:
	112	if (encoder->armed)
	113	encoder->dir = state - 1;
	114	break;
	115
	116	case 0x3:
bd3ce655	117	encoder->armed = true;
73969ff0 DM	118	break;
	119	}
	120
dee520e3 TT	121	mutex_unlock(&encoder->access_mutex);
dee520e3 TT	122
73969ff0 DM	123	return IRQ_HANDLED;
	124	}
	125
e70bdd41 JH	126	static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
	127	{
	128	struct rotary_encoder *encoder = dev_id;
	129	int state;
	130
dee520e3 TT	131	mutex_lock(&encoder->access_mutex);
dee520e3 TT	132
77a8f0ad	133	state = rotary_encoder_get_state(encoder);
e70bdd41 JH	134
	135	switch (state) {
	136	case 0x00:
	137	case 0x03:
	138	if (state != encoder->last_stable) {
	139	rotary_encoder_report_event(encoder);
	140	encoder->last_stable = state;
	141	}
	142	break;
	143
	144	case 0x01:
	145	case 0x02:
	146	encoder->dir = (encoder->last_stable + state) & 0x01;
	147	break;
	148	}
	149
dee520e3 TT	150	mutex_unlock(&encoder->access_mutex);
dee520e3 TT	151
e70bdd41 JH	152	return IRQ_HANDLED;
	153	}
	154
3a341a4c EG	155	static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id)
	156	{
	157	struct rotary_encoder *encoder = dev_id;
	158	unsigned char sum;
	159	int state;
	160
dee520e3 TT	161	mutex_lock(&encoder->access_mutex);
dee520e3 TT	162
77a8f0ad	163	state = rotary_encoder_get_state(encoder);
3a341a4c EG	164
	165	/*
	166	* We encode the previous and the current state using a byte.
	167	* The previous state in the MSB nibble, the current state in the LSB
	168	* nibble. Then use a table to decide the direction of the turn.
	169	*/
	170	sum = (encoder->last_stable << 4) + state;
	171	switch (sum) {
	172	case 0x31:
	173	case 0x10:
	174	case 0x02:
	175	case 0x23:
	176	encoder->dir = 0; /* clockwise */
	177	break;
	178
	179	case 0x13:
	180	case 0x01:
	181	case 0x20:
	182	case 0x32:
	183	encoder->dir = 1; /* counter-clockwise */
	184	break;
	185
	186	default:
	187	/*
	188	* Ignore all other values. This covers the case when the
	189	* state didn't change (a spurious interrupt) and the
	190	* cases where the state changed by two steps, making it
	191	* impossible to tell the direction.
	192	*
	193	* In either case, don't report any event and save the
	194	* state for later.
	195	*/
	196	goto out;
	197	}
	198
	199	rotary_encoder_report_event(encoder);
	200
	201	out:
	202	encoder->last_stable = state;
dee520e3 TT	203	mutex_unlock(&encoder->access_mutex);
dee520e3 TT	204
3a341a4c EG	205	return IRQ_HANDLED;
	206	}
	207
5298cc4c	208	static int rotary_encoder_probe(struct platform_device *pdev)
73969ff0	209	{
ce919537	210	struct device *dev = &pdev->dev;
73969ff0 DM	211	struct rotary_encoder *encoder;
73969ff0 DM	212	struct input_dev *input;
e70bdd41	213	irq_handler_t handler;
a9e340dc	214	u32 steps_per_period;
73969ff0 DM	215	int err;
73969ff0 DM	216
d9202af2 TT	217	encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL);
	218	if (!encoder)
	219	return -ENOMEM;
	220
77a8f0ad	221	mutex_init(&encoder->access_mutex);
a9e340dc DT	222
	223	device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps);
	224
	225	err = device_property_read_u32(dev, "rotary-encoder,steps-per-period",
	226	&steps_per_period);
	227	if (err) {
	228	/*
	229	* The 'half-period' property has been deprecated, you must
	230	* use 'steps-per-period' and set an appropriate value, but
	231	* we still need to parse it to maintain compatibility. If
	232	* neither property is present we fall back to the one step
	233	* per period behavior.
	234	*/
	235	steps_per_period = device_property_read_bool(dev,
	236	"rotary-encoder,half-period") ? 2 : 1;
	237	}
	238
	239	encoder->rollover =
	240	device_property_read_bool(dev, "rotary-encoder,rollover");
	241
	242	device_property_read_u32(dev, "linux,axis", &encoder->axis);
	243	encoder->relative_axis =
	244	device_property_read_bool(dev, "rotary-encoder,relative-axis");
77a8f0ad DT	245
	246	encoder->gpio_a = devm_gpiod_get_index(dev, NULL, 0, GPIOD_IN);
	247	if (IS_ERR(encoder->gpio_a)) {
	248	err = PTR_ERR(encoder->gpio_a);
	249	dev_err(dev, "unable to get GPIO at index 0: %d\n", err);
	250	return err;
	251	}
	252
	253	encoder->irq_a = gpiod_to_irq(encoder->gpio_a);
	254
	255	encoder->gpio_b = devm_gpiod_get_index(dev, NULL, 1, GPIOD_IN);
	256	if (IS_ERR(encoder->gpio_b)) {
	257	err = PTR_ERR(encoder->gpio_b);
	258	dev_err(dev, "unable to get GPIO at index 1: %d\n", err);
	259	return err;
	260	}
	261
	262	encoder->irq_b = gpiod_to_irq(encoder->gpio_b);
	263
d9202af2 TT	264	input = devm_input_allocate_device(dev);
	265	if (!input)
	266	return -ENOMEM;
73969ff0 DM	267
73969ff0 DM	268	encoder->input = input;
73969ff0	269
73969ff0 DM	270	input->name = pdev->name;
73969ff0 DM	271	input->id.bustype = BUS_HOST;
80c99bcd	272	input->dev.parent = dev;
bd3ce655	273
a9e340dc DT	274	if (encoder->relative_axis)
a9e340dc DT	275	input_set_capability(input, EV_REL, encoder->axis);
8631580f	276	else
a9e340dc DT	277	input_set_abs_params(input,
a9e340dc DT	278	encoder->axis, 0, encoder->steps, 0, 1);
73969ff0	279
a9e340dc	280	switch (steps_per_period) {
3a341a4c EG	281	case 4:
3a341a4c EG	282	handler = &rotary_encoder_quarter_period_irq;
77a8f0ad	283	encoder->last_stable = rotary_encoder_get_state(encoder);
3a341a4c EG	284	break;
3a341a4c EG	285	case 2:
e70bdd41	286	handler = &rotary_encoder_half_period_irq;
77a8f0ad	287	encoder->last_stable = rotary_encoder_get_state(encoder);
3a341a4c EG	288	break;
3a341a4c EG	289	case 1:
e70bdd41	290	handler = &rotary_encoder_irq;
3a341a4c EG	291	break;
	292	default:
	293	dev_err(dev, "'%d' is not a valid steps-per-period value\n",
a9e340dc	294	steps_per_period);
d9202af2	295	return -EINVAL;
e70bdd41 JH	296	}
e70bdd41 JH	297
dee520e3 TT	298	err = devm_request_threaded_irq(dev, encoder->irq_a, NULL, handler,
	299	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \|
	300	IRQF_ONESHOT,
	301	DRV_NAME, encoder);
73969ff0	302	if (err) {
429a34d7	303	dev_err(dev, "unable to request IRQ %d\n", encoder->irq_a);
d9202af2	304	return err;
73969ff0 DM	305	}
73969ff0 DM	306
dee520e3 TT	307	err = devm_request_threaded_irq(dev, encoder->irq_b, NULL, handler,
	308	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \|
	309	IRQF_ONESHOT,
	310	DRV_NAME, encoder);
73969ff0	311	if (err) {
429a34d7	312	dev_err(dev, "unable to request IRQ %d\n", encoder->irq_b);
d9202af2	313	return err;
73969ff0 DM	314	}
73969ff0 DM	315
80c99bcd DM	316	err = input_register_device(input);
	317	if (err) {
	318	dev_err(dev, "failed to register input device\n");
d9202af2	319	return err;
80c99bcd DM	320	}
80c99bcd DM	321
a9e340dc DT	322	device_init_wakeup(dev,
a9e340dc DT	323	device_property_read_bool(dev, "wakeup-source"));
47ec6e5a	324
73969ff0 DM	325	platform_set_drvdata(pdev, encoder);
	326
	327	return 0;
73969ff0 DM	328	}
73969ff0 DM	329
6a6f70b3	330	static int __maybe_unused rotary_encoder_suspend(struct device *dev)
47ec6e5a SR	331	{
	332	struct rotary_encoder *encoder = dev_get_drvdata(dev);
	333
	334	if (device_may_wakeup(dev)) {
	335	enable_irq_wake(encoder->irq_a);
	336	enable_irq_wake(encoder->irq_b);
	337	}
	338
	339	return 0;
	340	}
	341
6a6f70b3	342	static int __maybe_unused rotary_encoder_resume(struct device *dev)
47ec6e5a SR	343	{
	344	struct rotary_encoder *encoder = dev_get_drvdata(dev);
	345
	346	if (device_may_wakeup(dev)) {
	347	disable_irq_wake(encoder->irq_a);
	348	disable_irq_wake(encoder->irq_b);
	349	}
	350
	351	return 0;
	352	}
47ec6e5a SR	353
47ec6e5a SR	354	static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,
6a6f70b3	355	rotary_encoder_suspend, rotary_encoder_resume);
47ec6e5a	356
a9e340dc DT	357	#ifdef CONFIG_OF
	358	static const struct of_device_id rotary_encoder_of_match[] = {
	359	{ .compatible = "rotary-encoder", },
	360	{ },
	361	};
	362	MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);
	363	#endif
	364
73969ff0 DM	365	static struct platform_driver rotary_encoder_driver = {
73969ff0 DM	366	.probe = rotary_encoder_probe,
73969ff0 DM	367	.driver = {
73969ff0 DM	368	.name = DRV_NAME,
47ec6e5a	369	.pm = &rotary_encoder_pm_ops,
80c99bcd	370	.of_match_table = of_match_ptr(rotary_encoder_of_match),
73969ff0 DM	371	}
73969ff0 DM	372	};
840a746b	373	module_platform_driver(rotary_encoder_driver);
73969ff0 DM	374
	375	MODULE_ALIAS("platform:" DRV_NAME);
	376	MODULE_DESCRIPTION("GPIO rotary encoder driver");
e70bdd41	377	MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>, Johan Hovold");
73969ff0	378	MODULE_LICENSE("GPL v2");