[mirror_ubuntu-bionic-kernel.git] / drivers / input / keyboard / mpr121_touchkey.c

/*
 * Touchkey driver for Freescale MPR121 Controllor
 *
 * Copyright (C) 2011 Freescale Semiconductor, Inc.
 * Author: Zhang Jiejing <jiejing.zhang@freescale.com>
 *
 * Based on mcs_touchkey.c
 *
 * 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/bitops.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

/* Register definitions */
#define ELE_TOUCH_STATUS_0_ADDR	0x0
#define ELE_TOUCH_STATUS_1_ADDR	0X1
#define MHD_RISING_ADDR		0x2b
#define NHD_RISING_ADDR		0x2c
#define NCL_RISING_ADDR		0x2d
#define FDL_RISING_ADDR		0x2e
#define MHD_FALLING_ADDR	0x2f
#define NHD_FALLING_ADDR	0x30
#define NCL_FALLING_ADDR	0x31
#define FDL_FALLING_ADDR	0x32
#define ELE0_TOUCH_THRESHOLD_ADDR	0x41
#define ELE0_RELEASE_THRESHOLD_ADDR	0x42
#define AFE_CONF_ADDR			0x5c
#define FILTER_CONF_ADDR		0x5d

/*
 * ELECTRODE_CONF_ADDR: This register configures the number of
 * enabled capacitance sensing inputs and its run/suspend mode.
 */
#define ELECTRODE_CONF_ADDR		0x5e
#define ELECTRODE_CONF_QUICK_CHARGE	0x80
#define AUTO_CONFIG_CTRL_ADDR		0x7b
#define AUTO_CONFIG_USL_ADDR		0x7d
#define AUTO_CONFIG_LSL_ADDR		0x7e
#define AUTO_CONFIG_TL_ADDR		0x7f

/* Threshold of touch/release trigger */
#define TOUCH_THRESHOLD			0x08
#define RELEASE_THRESHOLD		0x05
/* Masks for touch and release triggers */
#define TOUCH_STATUS_MASK		0xfff
/* MPR121 has 12 keys */
#define MPR121_MAX_KEY_COUNT		12

struct mpr121_touchkey {
	struct i2c_client	*client;
	struct input_dev	*input_dev;
	unsigned int		statusbits;
	unsigned int		keycount;
	u32			keycodes[MPR121_MAX_KEY_COUNT];
};

struct mpr121_init_register {
	int addr;
	u8 val;
};

static const struct mpr121_init_register init_reg_table[] = {
	{ MHD_RISING_ADDR,	0x1 },
	{ NHD_RISING_ADDR,	0x1 },
	{ MHD_FALLING_ADDR,	0x1 },
	{ NHD_FALLING_ADDR,	0x1 },
	{ NCL_FALLING_ADDR,	0xff },
	{ FDL_FALLING_ADDR,	0x02 },
	{ FILTER_CONF_ADDR,	0x04 },
	{ AFE_CONF_ADDR,	0x0b },
	{ AUTO_CONFIG_CTRL_ADDR, 0x0b },
};

static void mpr121_vdd_supply_disable(void *data)
{
	struct regulator *vdd_supply = data;

	regulator_disable(vdd_supply);
}

static struct regulator *mpr121_vdd_supply_init(struct device *dev)
{
	struct regulator *vdd_supply;
	int err;

	vdd_supply = devm_regulator_get(dev, "vdd");
	if (IS_ERR(vdd_supply)) {
		dev_err(dev, "failed to get vdd regulator: %ld\n",
			PTR_ERR(vdd_supply));
		return vdd_supply;
	}

	err = regulator_enable(vdd_supply);
	if (err) {
		dev_err(dev, "failed to enable vdd regulator: %d\n", err);
		return ERR_PTR(err);
	}

	err = devm_add_action(dev, mpr121_vdd_supply_disable, vdd_supply);
	if (err) {
		regulator_disable(vdd_supply);
		dev_err(dev, "failed to add disable regulator action: %d\n",
			err);
		return ERR_PTR(err);
	}

	return vdd_supply;
}

static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id)
{
	struct mpr121_touchkey *mpr121 = dev_id;
	struct i2c_client *client = mpr121->client;
	struct input_dev *input = mpr121->input_dev;
	unsigned long bit_changed;
	unsigned int key_num;
	int reg;

	reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR);
	if (reg < 0) {
		dev_err(&client->dev, "i2c read error [%d]\n", reg);
		goto out;
	}

	reg <<= 8;
	reg |= i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_0_ADDR);
	if (reg < 0) {
		dev_err(&client->dev, "i2c read error [%d]\n", reg);
		goto out;
	}

	reg &= TOUCH_STATUS_MASK;
	/* use old press bit to figure out which bit changed */
	bit_changed = reg ^ mpr121->statusbits;
	mpr121->statusbits = reg;
	for_each_set_bit(key_num, &bit_changed, mpr121->keycount) {
		unsigned int key_val, pressed;

		pressed = reg & BIT(key_num);
		key_val = mpr121->keycodes[key_num];

		input_event(input, EV_MSC, MSC_SCAN, key_num);
		input_report_key(input, key_val, pressed);

		dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val,
			pressed ? "pressed" : "released");

	}
	input_sync(input);

out:
	return IRQ_HANDLED;
}

static int mpr121_phys_init(struct mpr121_touchkey *mpr121,
			    struct i2c_client *client, int vdd_uv)
{
	const struct mpr121_init_register *reg;
	unsigned char usl, lsl, tl, eleconf;
	int i, t, vdd, ret;

	/* Set up touch/release threshold for ele0-ele11 */
	for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) {
		t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2);
		ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD);
		if (ret < 0)
			goto err_i2c_write;
		ret = i2c_smbus_write_byte_data(client, t + 1,
						RELEASE_THRESHOLD);
		if (ret < 0)
			goto err_i2c_write;
	}

	/* Set up init register */
	for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) {
		reg = &init_reg_table[i];
		ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val);
		if (ret < 0)
			goto err_i2c_write;
	}


	/*
	 * Capacitance on sensing input varies and needs to be compensated.
	 * The internal MPR121-auto-configuration can do this if it's
	 * registers are set properly (based on vdd_uv).
	 */
	vdd = vdd_uv / 1000;
	usl = ((vdd - 700) * 256) / vdd;
	lsl = (usl * 65) / 100;
	tl = (usl * 90) / 100;
	ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl);
	ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl);
	ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl);

	/*
	 * Quick charge bit will let the capacitive charge to ready
	 * state quickly, or the buttons may not function after system
	 * boot.
	 */
	eleconf = mpr121->keycount | ELECTRODE_CONF_QUICK_CHARGE;
	ret |= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
					 eleconf);
	if (ret != 0)
		goto err_i2c_write;

	dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount);

	return 0;

err_i2c_write:
	dev_err(&client->dev, "i2c write error: %d\n", ret);
	return ret;
}

static int mpr_touchkey_probe(struct i2c_client *client,
			      const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct regulator *vdd_supply;
	int vdd_uv;
	struct mpr121_touchkey *mpr121;
	struct input_dev *input_dev;
	int error;
	int i;

	if (!client->irq) {
		dev_err(dev, "irq number should not be zero\n");
		return -EINVAL;
	}

	vdd_supply = mpr121_vdd_supply_init(dev);
	if (IS_ERR(vdd_supply))
		return PTR_ERR(vdd_supply);

	vdd_uv = regulator_get_voltage(vdd_supply);

	mpr121 = devm_kzalloc(dev, sizeof(*mpr121), GFP_KERNEL);
	if (!mpr121)
		return -ENOMEM;

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

	mpr121->client = client;
	mpr121->input_dev = input_dev;
	mpr121->keycount = device_property_read_u32_array(dev, "linux,keycodes",
							  NULL, 0);
	if (mpr121->keycount > MPR121_MAX_KEY_COUNT) {
		dev_err(dev, "too many keys defined (%d)\n", mpr121->keycount);
		return -EINVAL;
	}

	error = device_property_read_u32_array(dev, "linux,keycodes",
					       mpr121->keycodes,
					       mpr121->keycount);
	if (error) {
		dev_err(dev,
			"failed to read linux,keycode property: %d\n", error);
		return error;
	}

	input_dev->name = "Freescale MPR121 Touchkey";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = dev;
	if (device_property_read_bool(dev, "autorepeat"))
		__set_bit(EV_REP, input_dev->evbit);
	input_set_capability(input_dev, EV_MSC, MSC_SCAN);

	input_dev->keycode = mpr121->keycodes;
	input_dev->keycodesize = sizeof(mpr121->keycodes[0]);
	input_dev->keycodemax = mpr121->keycount;

	for (i = 0; i < mpr121->keycount; i++)
		input_set_capability(input_dev, EV_KEY, mpr121->keycodes[i]);

	error = mpr121_phys_init(mpr121, client, vdd_uv);
	if (error) {
		dev_err(dev, "Failed to init register\n");
		return error;
	}

	error = devm_request_threaded_irq(dev, client->irq, NULL,
					  mpr_touchkey_interrupt,
					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					  dev->driver->name, mpr121);
	if (error) {
		dev_err(dev, "Failed to register interrupt\n");
		return error;
	}

	error = input_register_device(input_dev);
	if (error)
		return error;

	i2c_set_clientdata(client, mpr121);
	device_init_wakeup(dev,
			device_property_read_bool(dev, "wakeup-source"));

	return 0;
}

static int __maybe_unused mpr_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);

	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00);

	return 0;
}

static int __maybe_unused mpr_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);

	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
				  mpr121->keycount);

	return 0;
}

static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);

static const struct i2c_device_id mpr121_id[] = {
	{ "mpr121_touchkey", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mpr121_id);

#ifdef CONFIG_OF
static const struct of_device_id mpr121_touchkey_dt_match_table[] = {
	{ .compatible = "fsl,mpr121-touchkey" },
	{ },
};
MODULE_DEVICE_TABLE(of, mpr121_touchkey_dt_match_table);
#endif

static struct i2c_driver mpr_touchkey_driver = {
	.driver = {
		.name	= "mpr121",
		.pm	= &mpr121_touchkey_pm_ops,
		.of_match_table = of_match_ptr(mpr121_touchkey_dt_match_table),
	},
	.id_table	= mpr121_id,
	.probe		= mpr_touchkey_probe,
};

module_i2c_driver(mpr_touchkey_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>");
MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip");
Commit	Line	Data
36682b81 ZJ	1	/*
	2	* Touchkey driver for Freescale MPR121 Controllor
	3	*
	4	* Copyright (C) 2011 Freescale Semiconductor, Inc.
	5	* Author: Zhang Jiejing <jiejing.zhang@freescale.com>
	6	*
	7	* Based on mcs_touchkey.c
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	*/
	14
36682b81	15	#include <linux/bitops.h>
de901cc3 AM	16	#include <linux/delay.h>
	17	#include <linux/i2c.h>
	18	#include <linux/input.h>
36682b81	19	#include <linux/interrupt.h>
de901cc3 AM	20	#include <linux/module.h>
	21	#include <linux/of.h>
	22	#include <linux/property.h>
	23	#include <linux/regulator/consumer.h>
	24	#include <linux/slab.h>
36682b81 ZJ	25
	26	/* Register definitions */
	27	#define ELE_TOUCH_STATUS_0_ADDR 0x0
	28	#define ELE_TOUCH_STATUS_1_ADDR 0X1
	29	#define MHD_RISING_ADDR 0x2b
	30	#define NHD_RISING_ADDR 0x2c
	31	#define NCL_RISING_ADDR 0x2d
	32	#define FDL_RISING_ADDR 0x2e
	33	#define MHD_FALLING_ADDR 0x2f
	34	#define NHD_FALLING_ADDR 0x30
	35	#define NCL_FALLING_ADDR 0x31
	36	#define FDL_FALLING_ADDR 0x32
	37	#define ELE0_TOUCH_THRESHOLD_ADDR 0x41
	38	#define ELE0_RELEASE_THRESHOLD_ADDR 0x42
	39	#define AFE_CONF_ADDR 0x5c
	40	#define FILTER_CONF_ADDR 0x5d
	41
	42	/*
	43	* ELECTRODE_CONF_ADDR: This register configures the number of
	44	* enabled capacitance sensing inputs and its run/suspend mode.
	45	*/
	46	#define ELECTRODE_CONF_ADDR 0x5e
c7b4a5d5	47	#define ELECTRODE_CONF_QUICK_CHARGE 0x80
36682b81 ZJ	48	#define AUTO_CONFIG_CTRL_ADDR 0x7b
	49	#define AUTO_CONFIG_USL_ADDR 0x7d
	50	#define AUTO_CONFIG_LSL_ADDR 0x7e
	51	#define AUTO_CONFIG_TL_ADDR 0x7f
	52
	53	/* Threshold of touch/release trigger */
c7b4a5d5 JZ	54	#define TOUCH_THRESHOLD 0x08
c7b4a5d5 JZ	55	#define RELEASE_THRESHOLD 0x05
36682b81 ZJ	56	/* Masks for touch and release triggers */
	57	#define TOUCH_STATUS_MASK 0xfff
	58	/* MPR121 has 12 keys */
	59	#define MPR121_MAX_KEY_COUNT 12
	60
	61	struct mpr121_touchkey {
	62	struct i2c_client *client;
	63	struct input_dev *input_dev;
36682b81 ZJ	64	unsigned int statusbits;
36682b81 ZJ	65	unsigned int keycount;
de901cc3	66	u32 keycodes[MPR121_MAX_KEY_COUNT];
36682b81 ZJ	67	};
	68
	69	struct mpr121_init_register {
	70	int addr;
	71	u8 val;
	72	};
	73
78f50c24	74	static const struct mpr121_init_register init_reg_table[] = {
36682b81 ZJ	75	{ MHD_RISING_ADDR, 0x1 },
	76	{ NHD_RISING_ADDR, 0x1 },
	77	{ MHD_FALLING_ADDR, 0x1 },
	78	{ NHD_FALLING_ADDR, 0x1 },
	79	{ NCL_FALLING_ADDR, 0xff },
	80	{ FDL_FALLING_ADDR, 0x02 },
	81	{ FILTER_CONF_ADDR, 0x04 },
	82	{ AFE_CONF_ADDR, 0x0b },
	83	{ AUTO_CONFIG_CTRL_ADDR, 0x0b },
	84	};
	85
de901cc3 AM	86	static void mpr121_vdd_supply_disable(void *data)
	87	{
	88	struct regulator *vdd_supply = data;
	89
	90	regulator_disable(vdd_supply);
	91	}
	92
	93	static struct regulator mpr121_vdd_supply_init(struct device dev)
	94	{
	95	struct regulator *vdd_supply;
	96	int err;
	97
	98	vdd_supply = devm_regulator_get(dev, "vdd");
	99	if (IS_ERR(vdd_supply)) {
	100	dev_err(dev, "failed to get vdd regulator: %ld\n",
	101	PTR_ERR(vdd_supply));
	102	return vdd_supply;
	103	}
	104
	105	err = regulator_enable(vdd_supply);
	106	if (err) {
	107	dev_err(dev, "failed to enable vdd regulator: %d\n", err);
	108	return ERR_PTR(err);
	109	}
	110
	111	err = devm_add_action(dev, mpr121_vdd_supply_disable, vdd_supply);
	112	if (err) {
	113	regulator_disable(vdd_supply);
	114	dev_err(dev, "failed to add disable regulator action: %d\n",
	115	err);
	116	return ERR_PTR(err);
	117	}
	118
	119	return vdd_supply;
	120	}
	121
36682b81 ZJ	122	static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id)
	123	{
	124	struct mpr121_touchkey *mpr121 = dev_id;
	125	struct i2c_client *client = mpr121->client;
	126	struct input_dev *input = mpr121->input_dev;
08fea55e AM	127	unsigned long bit_changed;
08fea55e AM	128	unsigned int key_num;
36682b81 ZJ	129	int reg;
	130
	131	reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR);
	132	if (reg < 0) {
	133	dev_err(&client->dev, "i2c read error [%d]\n", reg);
	134	goto out;
	135	}
	136
	137	reg <<= 8;
	138	reg \|= i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_0_ADDR);
	139	if (reg < 0) {
	140	dev_err(&client->dev, "i2c read error [%d]\n", reg);
	141	goto out;
	142	}
	143
	144	reg &= TOUCH_STATUS_MASK;
	145	/* use old press bit to figure out which bit changed */
08fea55e	146	bit_changed = reg ^ mpr121->statusbits;
36682b81	147	mpr121->statusbits = reg;
08fea55e AM	148	for_each_set_bit(key_num, &bit_changed, mpr121->keycount) {
08fea55e AM	149	unsigned int key_val, pressed;
36682b81	150
08fea55e AM	151	pressed = reg & BIT(key_num);
08fea55e AM	152	key_val = mpr121->keycodes[key_num];
36682b81	153
08fea55e AM	154	input_event(input, EV_MSC, MSC_SCAN, key_num);
	155	input_report_key(input, key_val, pressed);
	156
	157	dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val,
	158	pressed ? "pressed" : "released");
36682b81	159
08fea55e AM	160	}
08fea55e AM	161	input_sync(input);
36682b81 ZJ	162
	163	out:
	164	return IRQ_HANDLED;
	165	}
	166
de901cc3 AM	167	static int mpr121_phys_init(struct mpr121_touchkey *mpr121,
de901cc3 AM	168	struct i2c_client *client, int vdd_uv)
36682b81 ZJ	169	{
36682b81 ZJ	170	const struct mpr121_init_register *reg;
c7b4a5d5	171	unsigned char usl, lsl, tl, eleconf;
36682b81 ZJ	172	int i, t, vdd, ret;
	173
	174	/* Set up touch/release threshold for ele0-ele11 */
	175	for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) {
	176	t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2);
	177	ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD);
	178	if (ret < 0)
	179	goto err_i2c_write;
	180	ret = i2c_smbus_write_byte_data(client, t + 1,
	181	RELEASE_THRESHOLD);
	182	if (ret < 0)
	183	goto err_i2c_write;
	184	}
	185
	186	/* Set up init register */
	187	for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) {
	188	reg = &init_reg_table[i];
	189	ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val);
	190	if (ret < 0)
	191	goto err_i2c_write;
	192	}
	193
	194
	195	/*
	196	* Capacitance on sensing input varies and needs to be compensated.
	197	* The internal MPR121-auto-configuration can do this if it's
de901cc3	198	* registers are set properly (based on vdd_uv).
36682b81	199	*/
de901cc3	200	vdd = vdd_uv / 1000;
36682b81 ZJ	201	usl = ((vdd - 700) * 256) / vdd;
	202	lsl = (usl * 65) / 100;
	203	tl = (usl * 90) / 100;
	204	ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl);
	205	ret \|= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl);
	206	ret \|= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl);
c7b4a5d5 JZ	207
	208	/*
	209	* Quick charge bit will let the capacitive charge to ready
	210	* state quickly, or the buttons may not function after system
	211	* boot.
	212	*/
	213	eleconf = mpr121->keycount \| ELECTRODE_CONF_QUICK_CHARGE;
36682b81	214	ret \|= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
c7b4a5d5	215	eleconf);
36682b81 ZJ	216	if (ret != 0)
	217	goto err_i2c_write;
	218
	219	dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount);
	220
	221	return 0;
	222
	223	err_i2c_write:
	224	dev_err(&client->dev, "i2c write error: %d\n", ret);
	225	return ret;
	226	}
	227
5298cc4c BP	228	static int mpr_touchkey_probe(struct i2c_client *client,
5298cc4c BP	229	const struct i2c_device_id *id)
36682b81	230	{
de901cc3 AM	231	struct device *dev = &client->dev;
	232	struct regulator *vdd_supply;
	233	int vdd_uv;
36682b81 ZJ	234	struct mpr121_touchkey *mpr121;
	235	struct input_dev *input_dev;
	236	int error;
	237	int i;
	238
36682b81	239	if (!client->irq) {
b4e66e7d	240	dev_err(dev, "irq number should not be zero\n");
36682b81 ZJ	241	return -EINVAL;
	242	}
	243
de901cc3 AM	244	vdd_supply = mpr121_vdd_supply_init(dev);
	245	if (IS_ERR(vdd_supply))
	246	return PTR_ERR(vdd_supply);
	247
	248	vdd_uv = regulator_get_voltage(vdd_supply);
	249
b4e66e7d	250	mpr121 = devm_kzalloc(dev, sizeof(*mpr121), GFP_KERNEL);
254af0a3 PG	251	if (!mpr121)
	252	return -ENOMEM;
	253
b4e66e7d	254	input_dev = devm_input_allocate_device(dev);
254af0a3 PG	255	if (!input_dev)
254af0a3 PG	256	return -ENOMEM;
36682b81 ZJ	257
	258	mpr121->client = client;
	259	mpr121->input_dev = input_dev;
de901cc3 AM	260	mpr121->keycount = device_property_read_u32_array(dev, "linux,keycodes",
	261	NULL, 0);
	262	if (mpr121->keycount > MPR121_MAX_KEY_COUNT) {
	263	dev_err(dev, "too many keys defined (%d)\n", mpr121->keycount);
	264	return -EINVAL;
	265	}
	266
	267	error = device_property_read_u32_array(dev, "linux,keycodes",
	268	mpr121->keycodes,
	269	mpr121->keycount);
	270	if (error) {
	271	dev_err(dev,
	272	"failed to read linux,keycode property: %d\n", error);
	273	return error;
	274	}
36682b81 ZJ	275
	276	input_dev->name = "Freescale MPR121 Touchkey";
	277	input_dev->id.bustype = BUS_I2C;
b4e66e7d	278	input_dev->dev.parent = dev;
de901cc3 AM	279	if (device_property_read_bool(dev, "autorepeat"))
de901cc3 AM	280	__set_bit(EV_REP, input_dev->evbit);
9723ddc8	281	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
36682b81 ZJ	282
	283	input_dev->keycode = mpr121->keycodes;
	284	input_dev->keycodesize = sizeof(mpr121->keycodes[0]);
	285	input_dev->keycodemax = mpr121->keycount;
	286
de901cc3 AM	287	for (i = 0; i < mpr121->keycount; i++)
de901cc3 AM	288	input_set_capability(input_dev, EV_KEY, mpr121->keycodes[i]);
36682b81	289
de901cc3	290	error = mpr121_phys_init(mpr121, client, vdd_uv);
36682b81	291	if (error) {
b4e66e7d	292	dev_err(dev, "Failed to init register\n");
254af0a3	293	return error;
36682b81 ZJ	294	}
36682b81 ZJ	295
b4e66e7d GR	296	error = devm_request_threaded_irq(dev, client->irq, NULL,
b4e66e7d GR	297	mpr_touchkey_interrupt,
de901cc3	298	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
b4e66e7d	299	dev->driver->name, mpr121);
36682b81	300	if (error) {
b4e66e7d	301	dev_err(dev, "Failed to register interrupt\n");
254af0a3	302	return error;
36682b81 ZJ	303	}
	304
	305	error = input_register_device(input_dev);
	306	if (error)
254af0a3	307	return error;
36682b81 ZJ	308
36682b81 ZJ	309	i2c_set_clientdata(client, mpr121);
de901cc3 AM	310	device_init_wakeup(dev,
de901cc3 AM	311	device_property_read_bool(dev, "wakeup-source"));
36682b81	312
36682b81 ZJ	313	return 0;
	314	}
	315
890fa167	316	static int __maybe_unused mpr_suspend(struct device *dev)
36682b81 ZJ	317	{
	318	struct i2c_client *client = to_i2c_client(dev);
	319
	320	if (device_may_wakeup(&client->dev))
	321	enable_irq_wake(client->irq);
	322
	323	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00);
	324
	325	return 0;
	326	}
	327
890fa167	328	static int __maybe_unused mpr_resume(struct device *dev)
36682b81 ZJ	329	{
	330	struct i2c_client *client = to_i2c_client(dev);
	331	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
	332
	333	if (device_may_wakeup(&client->dev))
	334	disable_irq_wake(client->irq);
	335
	336	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
	337	mpr121->keycount);
	338
	339	return 0;
	340	}
36682b81 ZJ	341
	342	static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);
	343
	344	static const struct i2c_device_id mpr121_id[] = {
	345	{ "mpr121_touchkey", 0 },
	346	{ }
	347	};
	348	MODULE_DEVICE_TABLE(i2c, mpr121_id);
	349
de901cc3 AM	350	#ifdef CONFIG_OF
	351	static const struct of_device_id mpr121_touchkey_dt_match_table[] = {
	352	{ .compatible = "fsl,mpr121-touchkey" },
	353	{ },
	354	};
	355	MODULE_DEVICE_TABLE(of, mpr121_touchkey_dt_match_table);
	356	#endif
	357
36682b81 ZJ	358	static struct i2c_driver mpr_touchkey_driver = {
	359	.driver = {
	360	.name = "mpr121",
36682b81	361	.pm = &mpr121_touchkey_pm_ops,
de901cc3	362	.of_match_table = of_match_ptr(mpr121_touchkey_dt_match_table),
36682b81 ZJ	363	},
	364	.id_table = mpr121_id,
	365	.probe = mpr_touchkey_probe,
36682b81 ZJ	366	};
36682b81 ZJ	367
1b92c1cf	368	module_i2c_driver(mpr_touchkey_driver);
36682b81 ZJ	369
	370	MODULE_LICENSE("GPL");
	371	MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>");
	372	MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip");