[thirdparty/kernel/stable.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/module.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/i2c/mpr121_touchkey.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;
	u16			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 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(const struct mpr121_platform_data *pdata,
				      struct mpr121_touchkey *mpr121,
				      struct i2c_client *client)
{
	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 pdata->vdd_uv).
	 */
	vdd = pdata->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)
{
	const struct mpr121_platform_data *pdata =
			dev_get_platdata(&client->dev);
	struct mpr121_touchkey *mpr121;
	struct input_dev *input_dev;
	int error;
	int i;

	if (!pdata) {
		dev_err(&client->dev, "no platform data defined\n");
		return -EINVAL;
	}

	if (!pdata->keymap || !pdata->keymap_size) {
		dev_err(&client->dev, "missing keymap data\n");
		return -EINVAL;
	}

	if (pdata->keymap_size > MPR121_MAX_KEY_COUNT) {
		dev_err(&client->dev, "too many keys defined\n");
		return -EINVAL;
	}

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

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

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

	mpr121->client = client;
	mpr121->input_dev = input_dev;
	mpr121->keycount = pdata->keymap_size;

	input_dev->name = "Freescale MPR121 Touchkey";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;
	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
	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 < pdata->keymap_size; i++) {
		input_set_capability(input_dev, EV_KEY, pdata->keymap[i]);
		mpr121->keycodes[i] = pdata->keymap[i];
	}

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

	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
				     mpr_touchkey_interrupt,
				     IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				     client->dev.driver->name, mpr121);
	if (error) {
		dev_err(&client->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(&client->dev, pdata->wakeup);

	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);

static struct i2c_driver mpr_touchkey_driver = {
	.driver = {
		.name	= "mpr121",
		.pm	= &mpr121_touchkey_pm_ops,
	},
	.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
	15	#include <linux/module.h>
36682b81 ZJ	16	#include <linux/input.h>
	17	#include <linux/i2c.h>
	18	#include <linux/slab.h>
	19	#include <linux/delay.h>
	20	#include <linux/bitops.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/i2c/mpr121_touchkey.h>
	23
	24	/* Register definitions */
	25	#define ELE_TOUCH_STATUS_0_ADDR 0x0
	26	#define ELE_TOUCH_STATUS_1_ADDR 0X1
	27	#define MHD_RISING_ADDR 0x2b
	28	#define NHD_RISING_ADDR 0x2c
	29	#define NCL_RISING_ADDR 0x2d
	30	#define FDL_RISING_ADDR 0x2e
	31	#define MHD_FALLING_ADDR 0x2f
	32	#define NHD_FALLING_ADDR 0x30
	33	#define NCL_FALLING_ADDR 0x31
	34	#define FDL_FALLING_ADDR 0x32
	35	#define ELE0_TOUCH_THRESHOLD_ADDR 0x41
	36	#define ELE0_RELEASE_THRESHOLD_ADDR 0x42
	37	#define AFE_CONF_ADDR 0x5c
	38	#define FILTER_CONF_ADDR 0x5d
	39
	40	/*
	41	* ELECTRODE_CONF_ADDR: This register configures the number of
	42	* enabled capacitance sensing inputs and its run/suspend mode.
	43	*/
	44	#define ELECTRODE_CONF_ADDR 0x5e
c7b4a5d5	45	#define ELECTRODE_CONF_QUICK_CHARGE 0x80
36682b81 ZJ	46	#define AUTO_CONFIG_CTRL_ADDR 0x7b
	47	#define AUTO_CONFIG_USL_ADDR 0x7d
	48	#define AUTO_CONFIG_LSL_ADDR 0x7e
	49	#define AUTO_CONFIG_TL_ADDR 0x7f
	50
	51	/* Threshold of touch/release trigger */
c7b4a5d5 JZ	52	#define TOUCH_THRESHOLD 0x08
c7b4a5d5 JZ	53	#define RELEASE_THRESHOLD 0x05
36682b81 ZJ	54	/* Masks for touch and release triggers */
	55	#define TOUCH_STATUS_MASK 0xfff
	56	/* MPR121 has 12 keys */
	57	#define MPR121_MAX_KEY_COUNT 12
	58
	59	struct mpr121_touchkey {
	60	struct i2c_client *client;
	61	struct input_dev *input_dev;
36682b81 ZJ	62	unsigned int statusbits;
	63	unsigned int keycount;
	64	u16 keycodes[MPR121_MAX_KEY_COUNT];
	65	};
	66
	67	struct mpr121_init_register {
	68	int addr;
	69	u8 val;
	70	};
	71
78f50c24	72	static const struct mpr121_init_register init_reg_table[] = {
36682b81 ZJ	73	{ MHD_RISING_ADDR, 0x1 },
	74	{ NHD_RISING_ADDR, 0x1 },
	75	{ MHD_FALLING_ADDR, 0x1 },
	76	{ NHD_FALLING_ADDR, 0x1 },
	77	{ NCL_FALLING_ADDR, 0xff },
	78	{ FDL_FALLING_ADDR, 0x02 },
	79	{ FILTER_CONF_ADDR, 0x04 },
	80	{ AFE_CONF_ADDR, 0x0b },
	81	{ AUTO_CONFIG_CTRL_ADDR, 0x0b },
	82	};
	83
	84	static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id)
	85	{
	86	struct mpr121_touchkey *mpr121 = dev_id;
	87	struct i2c_client *client = mpr121->client;
	88	struct input_dev *input = mpr121->input_dev;
08fea55e AM	89	unsigned long bit_changed;
08fea55e AM	90	unsigned int key_num;
36682b81 ZJ	91	int reg;
	92
	93	reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR);
	94	if (reg < 0) {
	95	dev_err(&client->dev, "i2c read error [%d]\n", reg);
	96	goto out;
	97	}
	98
	99	reg <<= 8;
	100	reg \|= i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_0_ADDR);
	101	if (reg < 0) {
	102	dev_err(&client->dev, "i2c read error [%d]\n", reg);
	103	goto out;
	104	}
	105
	106	reg &= TOUCH_STATUS_MASK;
	107	/* use old press bit to figure out which bit changed */
08fea55e	108	bit_changed = reg ^ mpr121->statusbits;
36682b81	109	mpr121->statusbits = reg;
08fea55e AM	110	for_each_set_bit(key_num, &bit_changed, mpr121->keycount) {
08fea55e AM	111	unsigned int key_val, pressed;
36682b81	112
08fea55e AM	113	pressed = reg & BIT(key_num);
08fea55e AM	114	key_val = mpr121->keycodes[key_num];
36682b81	115
08fea55e AM	116	input_event(input, EV_MSC, MSC_SCAN, key_num);
	117	input_report_key(input, key_val, pressed);
	118
	119	dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val,
	120	pressed ? "pressed" : "released");
36682b81	121
08fea55e AM	122	}
08fea55e AM	123	input_sync(input);
36682b81 ZJ	124
	125	out:
	126	return IRQ_HANDLED;
	127	}
	128
5298cc4c	129	static int mpr121_phys_init(const struct mpr121_platform_data *pdata,
36682b81 ZJ	130	struct mpr121_touchkey *mpr121,
	131	struct i2c_client *client)
	132	{
	133	const struct mpr121_init_register *reg;
c7b4a5d5	134	unsigned char usl, lsl, tl, eleconf;
36682b81 ZJ	135	int i, t, vdd, ret;
	136
	137	/* Set up touch/release threshold for ele0-ele11 */
	138	for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) {
	139	t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2);
	140	ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD);
	141	if (ret < 0)
	142	goto err_i2c_write;
	143	ret = i2c_smbus_write_byte_data(client, t + 1,
	144	RELEASE_THRESHOLD);
	145	if (ret < 0)
	146	goto err_i2c_write;
	147	}
	148
	149	/* Set up init register */
	150	for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) {
	151	reg = &init_reg_table[i];
	152	ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val);
	153	if (ret < 0)
	154	goto err_i2c_write;
	155	}
	156
	157
	158	/*
	159	* Capacitance on sensing input varies and needs to be compensated.
	160	* The internal MPR121-auto-configuration can do this if it's
	161	* registers are set properly (based on pdata->vdd_uv).
	162	*/
	163	vdd = pdata->vdd_uv / 1000;
	164	usl = ((vdd - 700) * 256) / vdd;
	165	lsl = (usl * 65) / 100;
	166	tl = (usl * 90) / 100;
	167	ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl);
	168	ret \|= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl);
	169	ret \|= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl);
c7b4a5d5 JZ	170
	171	/*
	172	* Quick charge bit will let the capacitive charge to ready
	173	* state quickly, or the buttons may not function after system
	174	* boot.
	175	*/
	176	eleconf = mpr121->keycount \| ELECTRODE_CONF_QUICK_CHARGE;
36682b81	177	ret \|= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
c7b4a5d5	178	eleconf);
36682b81 ZJ	179	if (ret != 0)
	180	goto err_i2c_write;
	181
	182	dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount);
	183
	184	return 0;
	185
	186	err_i2c_write:
	187	dev_err(&client->dev, "i2c write error: %d\n", ret);
	188	return ret;
	189	}
	190
5298cc4c BP	191	static int mpr_touchkey_probe(struct i2c_client *client,
5298cc4c BP	192	const struct i2c_device_id *id)
36682b81	193	{
c838cb3d JH	194	const struct mpr121_platform_data *pdata =
c838cb3d JH	195	dev_get_platdata(&client->dev);
36682b81 ZJ	196	struct mpr121_touchkey *mpr121;
	197	struct input_dev *input_dev;
	198	int error;
	199	int i;
	200
	201	if (!pdata) {
	202	dev_err(&client->dev, "no platform data defined\n");
	203	return -EINVAL;
	204	}
	205
	206	if (!pdata->keymap \|\| !pdata->keymap_size) {
	207	dev_err(&client->dev, "missing keymap data\n");
	208	return -EINVAL;
	209	}
	210
	211	if (pdata->keymap_size > MPR121_MAX_KEY_COUNT) {
	212	dev_err(&client->dev, "too many keys defined\n");
	213	return -EINVAL;
	214	}
	215
	216	if (!client->irq) {
	217	dev_err(&client->dev, "irq number should not be zero\n");
	218	return -EINVAL;
	219	}
	220
254af0a3 PG	221	mpr121 = devm_kzalloc(&client->dev, sizeof(*mpr121),
	222	GFP_KERNEL);
	223	if (!mpr121)
	224	return -ENOMEM;
	225
	226	input_dev = devm_input_allocate_device(&client->dev);
	227	if (!input_dev)
	228	return -ENOMEM;
36682b81 ZJ	229
	230	mpr121->client = client;
	231	mpr121->input_dev = input_dev;
	232	mpr121->keycount = pdata->keymap_size;
	233
	234	input_dev->name = "Freescale MPR121 Touchkey";
	235	input_dev->id.bustype = BUS_I2C;
	236	input_dev->dev.parent = &client->dev;
	237	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REP);
9723ddc8	238	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
36682b81 ZJ	239
	240	input_dev->keycode = mpr121->keycodes;
	241	input_dev->keycodesize = sizeof(mpr121->keycodes[0]);
	242	input_dev->keycodemax = mpr121->keycount;
	243
	244	for (i = 0; i < pdata->keymap_size; i++) {
	245	input_set_capability(input_dev, EV_KEY, pdata->keymap[i]);
	246	mpr121->keycodes[i] = pdata->keymap[i];
	247	}
	248
	249	error = mpr121_phys_init(pdata, mpr121, client);
	250	if (error) {
	251	dev_err(&client->dev, "Failed to init register\n");
254af0a3	252	return error;
36682b81 ZJ	253	}
36682b81 ZJ	254
254af0a3	255	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
36682b81	256	mpr_touchkey_interrupt,
9b7e31bb	257	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
36682b81 ZJ	258	client->dev.driver->name, mpr121);
	259	if (error) {
	260	dev_err(&client->dev, "Failed to register interrupt\n");
254af0a3	261	return error;
36682b81 ZJ	262	}
	263
	264	error = input_register_device(input_dev);
	265	if (error)
254af0a3	266	return error;
36682b81 ZJ	267
	268	i2c_set_clientdata(client, mpr121);
	269	device_init_wakeup(&client->dev, pdata->wakeup);
	270
36682b81 ZJ	271	return 0;
	272	}
	273
890fa167	274	static int __maybe_unused mpr_suspend(struct device *dev)
36682b81 ZJ	275	{
	276	struct i2c_client *client = to_i2c_client(dev);
	277
	278	if (device_may_wakeup(&client->dev))
	279	enable_irq_wake(client->irq);
	280
	281	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00);
	282
	283	return 0;
	284	}
	285
890fa167	286	static int __maybe_unused mpr_resume(struct device *dev)
36682b81 ZJ	287	{
	288	struct i2c_client *client = to_i2c_client(dev);
	289	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
	290
	291	if (device_may_wakeup(&client->dev))
	292	disable_irq_wake(client->irq);
	293
	294	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
	295	mpr121->keycount);
	296
	297	return 0;
	298	}
36682b81 ZJ	299
	300	static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);
	301
	302	static const struct i2c_device_id mpr121_id[] = {
	303	{ "mpr121_touchkey", 0 },
	304	{ }
	305	};
	306	MODULE_DEVICE_TABLE(i2c, mpr121_id);
	307
	308	static struct i2c_driver mpr_touchkey_driver = {
	309	.driver = {
	310	.name = "mpr121",
36682b81 ZJ	311	.pm = &mpr121_touchkey_pm_ops,
	312	},
	313	.id_table = mpr121_id,
	314	.probe = mpr_touchkey_probe,
36682b81 ZJ	315	};
36682b81 ZJ	316
1b92c1cf	317	module_i2c_driver(mpr_touchkey_driver);
36682b81 ZJ	318
	319	MODULE_LICENSE("GPL");
	320	MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>");
	321	MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip");