[GitHub/mt8127/android_kernel_alcatel_ttab.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/init.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 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			0x0f
#define RELEASE_THRESHOLD		0x0a
/* 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		key_val;
	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[] __devinitconst = {
	{ 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 int key_num, key_val, pressed;
	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 */
	key_num = ffs(reg ^ mpr121->statusbits) - 1;
	pressed = reg & (1 << key_num);
	mpr121->statusbits = reg;

	key_val = mpr121->keycodes[key_num];

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

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

out:
	return IRQ_HANDLED;
}

static int __devinit 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;
	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);
	ret |= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
					 mpr121->keycount);
	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 __devinit mpr_touchkey_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	const struct mpr121_platform_data *pdata = client->dev.platform_data;
	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 = kzalloc(sizeof(struct mpr121_touchkey), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!mpr121 || !input_dev) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	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_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");
		goto err_free_mem;
	}

	error = request_threaded_irq(client->irq, NULL,
				     mpr_touchkey_interrupt,
				     IRQF_TRIGGER_FALLING,
				     client->dev.driver->name, mpr121);
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_mem;
	}

	error = input_register_device(input_dev);
	if (error)
		goto err_free_irq;

	i2c_set_clientdata(client, mpr121);
	device_init_wakeup(&client->dev, pdata->wakeup);

	return 0;

err_free_irq:
	free_irq(client->irq, mpr121);
err_free_mem:
	input_free_device(input_dev);
	kfree(mpr121);
	return error;
}

static int __devexit mpr_touchkey_remove(struct i2c_client *client)
{
	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);

	free_irq(client->irq, mpr121);
	input_unregister_device(mpr121->input_dev);
	kfree(mpr121);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int 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 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;
}
#endif

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",
		.owner	= THIS_MODULE,
		.pm	= &mpr121_touchkey_pm_ops,
	},
	.id_table	= mpr121_id,
	.probe		= mpr_touchkey_probe,
	.remove		= __devexit_p(mpr_touchkey_remove),
};

static int __init mpr_touchkey_init(void)
{
	return i2c_add_driver(&mpr_touchkey_driver);
}
module_init(mpr_touchkey_init);

static void __exit mpr_touchkey_exit(void)
{
	i2c_del_driver(&mpr_touchkey_driver);
}
module_exit(mpr_touchkey_exit);

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>
	16	#include <linux/init.h>
	17	#include <linux/input.h>
	18	#include <linux/i2c.h>
	19	#include <linux/slab.h>
	20	#include <linux/delay.h>
	21	#include <linux/bitops.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/i2c/mpr121_touchkey.h>
	24
	25	/* Register definitions */
	26	#define ELE_TOUCH_STATUS_0_ADDR 0x0
	27	#define ELE_TOUCH_STATUS_1_ADDR 0X1
	28	#define MHD_RISING_ADDR 0x2b
	29	#define NHD_RISING_ADDR 0x2c
	30	#define NCL_RISING_ADDR 0x2d
	31	#define FDL_RISING_ADDR 0x2e
	32	#define MHD_FALLING_ADDR 0x2f
	33	#define NHD_FALLING_ADDR 0x30
	34	#define NCL_FALLING_ADDR 0x31
	35	#define FDL_FALLING_ADDR 0x32
	36	#define ELE0_TOUCH_THRESHOLD_ADDR 0x41
	37	#define ELE0_RELEASE_THRESHOLD_ADDR 0x42
	38	#define AFE_CONF_ADDR 0x5c
	39	#define FILTER_CONF_ADDR 0x5d
	40
	41	/*
	42	* ELECTRODE_CONF_ADDR: This register configures the number of
	43	* enabled capacitance sensing inputs and its run/suspend mode.
	44	*/
	45	#define ELECTRODE_CONF_ADDR 0x5e
	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 */
	52	#define TOUCH_THRESHOLD 0x0f
	53	#define RELEASE_THRESHOLD 0x0a
	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;
	62	unsigned int key_val;
	63	unsigned int statusbits;
	64	unsigned int keycount;
65	u16 keycodes[MPR121_MAX_KEY_COUNT];
66	};
67
68	struct mpr121_init_register {
69	int addr;
70	u8 val;
71	};
72
73	static const struct mpr121_init_register init_reg_table[] __devinitconst = {
74	{ MHD_RISING_ADDR, 0x1 },
75	{ NHD_RISING_ADDR, 0x1 },
76	{ MHD_FALLING_ADDR, 0x1 },
77	{ NHD_FALLING_ADDR, 0x1 },
78	{ NCL_FALLING_ADDR, 0xff },
79	{ FDL_FALLING_ADDR, 0x02 },
80	{ FILTER_CONF_ADDR, 0x04 },
81	{ AFE_CONF_ADDR, 0x0b },
82	{ AUTO_CONFIG_CTRL_ADDR, 0x0b },
83	};
84
85	static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id)
86	{
87	struct mpr121_touchkey *mpr121 = dev_id;
88	struct i2c_client *client = mpr121->client;
89	struct input_dev *input = mpr121->input_dev;
90	unsigned int key_num, key_val, pressed;
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 */
108	key_num = ffs(reg ^ mpr121->statusbits) - 1;
109	pressed = reg & (1 << key_num);
110	mpr121->statusbits = reg;
111
112	key_val = mpr121->keycodes[key_num];
113
114	input_event(input, EV_MSC, MSC_SCAN, key_num);
115	input_report_key(input, key_val, pressed);
116	input_sync(input);
117
118	dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val,
119	pressed ? "pressed" : "released");
120
121	out:
122	return IRQ_HANDLED;
123	}
124
125	static int __devinit mpr121_phys_init(const struct mpr121_platform_data *pdata,
126	struct mpr121_touchkey *mpr121,
127	struct i2c_client *client)
128	{
129	const struct mpr121_init_register *reg;
130	unsigned char usl, lsl, tl;
131	int i, t, vdd, ret;
132
133	/* Set up touch/release threshold for ele0-ele11 */
134	for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) {
135	t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2);
136	ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD);
137	if (ret < 0)
138	goto err_i2c_write;
139	ret = i2c_smbus_write_byte_data(client, t + 1,
140	RELEASE_THRESHOLD);
141	if (ret < 0)
142	goto err_i2c_write;
143	}
144
145	/* Set up init register */
146	for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) {
147	reg = &init_reg_table[i];
148	ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val);
149	if (ret < 0)
150	goto err_i2c_write;
151	}
152
153
154	/*
155	* Capacitance on sensing input varies and needs to be compensated.
156	* The internal MPR121-auto-configuration can do this if it's
157	* registers are set properly (based on pdata->vdd_uv).
158	*/
159	vdd = pdata->vdd_uv / 1000;
160	usl = ((vdd - 700) * 256) / vdd;
161	lsl = (usl * 65) / 100;
162	tl = (usl * 90) / 100;
163	ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl);
164	ret \|= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl);
165	ret \|= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl);
166	ret \|= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
167	mpr121->keycount);
168	if (ret != 0)
169	goto err_i2c_write;
170
171	dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount);
172
173	return 0;
174
175	err_i2c_write:
176	dev_err(&client->dev, "i2c write error: %d\n", ret);
177	return ret;
178	}
179
180	static int __devinit mpr_touchkey_probe(struct i2c_client *client,
181	const struct i2c_device_id *id)
182	{
183	const struct mpr121_platform_data *pdata = client->dev.platform_data;
184	struct mpr121_touchkey *mpr121;
185	struct input_dev *input_dev;
186	int error;
187	int i;
188
189	if (!pdata) {
190	dev_err(&client->dev, "no platform data defined\n");
191	return -EINVAL;
192	}
193
194	if (!pdata->keymap \|\| !pdata->keymap_size) {
195	dev_err(&client->dev, "missing keymap data\n");
196	return -EINVAL;
197	}
198
199	if (pdata->keymap_size > MPR121_MAX_KEY_COUNT) {
200	dev_err(&client->dev, "too many keys defined\n");
201	return -EINVAL;
202	}
203
204	if (!client->irq) {
205	dev_err(&client->dev, "irq number should not be zero\n");
206	return -EINVAL;
207	}
208
209	mpr121 = kzalloc(sizeof(struct mpr121_touchkey), GFP_KERNEL);
210	input_dev = input_allocate_device();
211	if (!mpr121 \|\| !input_dev) {
212	dev_err(&client->dev, "Failed to allocate memory\n");
213	error = -ENOMEM;
214	goto err_free_mem;
215	}
216
217	mpr121->client = client;
218	mpr121->input_dev = input_dev;
219	mpr121->keycount = pdata->keymap_size;
220
221	input_dev->name = "Freescale MPR121 Touchkey";
222	input_dev->id.bustype = BUS_I2C;
223	input_dev->dev.parent = &client->dev;
224	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REP);
225
226	input_dev->keycode = mpr121->keycodes;
227	input_dev->keycodesize = sizeof(mpr121->keycodes[0]);
228	input_dev->keycodemax = mpr121->keycount;
229
230	for (i = 0; i < pdata->keymap_size; i++) {
231	input_set_capability(input_dev, EV_KEY, pdata->keymap[i]);
232	mpr121->keycodes[i] = pdata->keymap[i];
233	}
234
235	error = mpr121_phys_init(pdata, mpr121, client);
236	if (error) {
237	dev_err(&client->dev, "Failed to init register\n");
238	goto err_free_mem;
239	}
240
241	error = request_threaded_irq(client->irq, NULL,
242	mpr_touchkey_interrupt,
243	IRQF_TRIGGER_FALLING,
244	client->dev.driver->name, mpr121);
245	if (error) {
246	dev_err(&client->dev, "Failed to register interrupt\n");
247	goto err_free_mem;
248	}
249
250	error = input_register_device(input_dev);
251	if (error)
252	goto err_free_irq;
253
254	i2c_set_clientdata(client, mpr121);
255	device_init_wakeup(&client->dev, pdata->wakeup);
256
257	return 0;
258
259	err_free_irq:
260	free_irq(client->irq, mpr121);
261	err_free_mem:
262	input_free_device(input_dev);
263	kfree(mpr121);
264	return error;
265	}
266
267	static int __devexit mpr_touchkey_remove(struct i2c_client *client)
268	{
269	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
270
271	free_irq(client->irq, mpr121);
272	input_unregister_device(mpr121->input_dev);
273	kfree(mpr121);
274
275	return 0;
276	}
277
278	#ifdef CONFIG_PM_SLEEP
279	static int mpr_suspend(struct device *dev)
280	{
281	struct i2c_client *client = to_i2c_client(dev);
282
283	if (device_may_wakeup(&client->dev))
284	enable_irq_wake(client->irq);
285
286	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00);
287
288	return 0;
289	}
290
291	static int mpr_resume(struct device *dev)
292	{
293	struct i2c_client *client = to_i2c_client(dev);
294	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
295
296	if (device_may_wakeup(&client->dev))
297	disable_irq_wake(client->irq);
298
299	i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
300	mpr121->keycount);
301
302	return 0;
303	}
304	#endif
305
306	static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);
307
308	static const struct i2c_device_id mpr121_id[] = {
309	{ "mpr121_touchkey", 0 },
310	{ }
311	};
312	MODULE_DEVICE_TABLE(i2c, mpr121_id);
313
314	static struct i2c_driver mpr_touchkey_driver = {
315	.driver = {
316	.name = "mpr121",
317	.owner = THIS_MODULE,
318	.pm = &mpr121_touchkey_pm_ops,
319	},
320	.id_table = mpr121_id,
321	.probe = mpr_touchkey_probe,
322	.remove = __devexit_p(mpr_touchkey_remove),
323	};
324
325	static int __init mpr_touchkey_init(void)
326	{
327	return i2c_add_driver(&mpr_touchkey_driver);
328	}
329	module_init(mpr_touchkey_init);
330
331	static void __exit mpr_touchkey_exit(void)
332	{
333	i2c_del_driver(&mpr_touchkey_driver);
334	}
335	module_exit(mpr_touchkey_exit);
336
337	MODULE_LICENSE("GPL");
338	MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>");
339	MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip");