drivers/input/keyboard/stmpe-keypad.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) ST-Ericsson SA 2010
  *
  * License Terms: GNU General Public License, version 2
  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/input/matrix_keypad.h>
 #include <linux/mfd/stmpe.h>

 /* These are at the same addresses in all STMPE variants */
 #define STMPE_KPC_COL			0x60
 #define STMPE_KPC_ROW_MSB		0x61
 #define STMPE_KPC_ROW_LSB		0x62
 #define STMPE_KPC_CTRL_MSB		0x63
 #define STMPE_KPC_CTRL_LSB		0x64
 #define STMPE_KPC_COMBI_KEY_0		0x65
 #define STMPE_KPC_COMBI_KEY_1		0x66
 #define STMPE_KPC_COMBI_KEY_2		0x67
 #define STMPE_KPC_DATA_BYTE0		0x68
 #define STMPE_KPC_DATA_BYTE1		0x69
 #define STMPE_KPC_DATA_BYTE2		0x6a
 #define STMPE_KPC_DATA_BYTE3		0x6b
 #define STMPE_KPC_DATA_BYTE4		0x6c

 #define STMPE_KPC_CTRL_LSB_SCAN		(0x1 << 0)
 #define STMPE_KPC_CTRL_LSB_DEBOUNCE	(0x7f << 1)
 #define STMPE_KPC_CTRL_MSB_SCAN_COUNT	(0xf << 4)

 #define STMPE_KPC_ROW_MSB_ROWS		0xff

 #define STMPE_KPC_DATA_UP		(0x1 << 7)
 #define STMPE_KPC_DATA_ROW		(0xf << 3)
 #define STMPE_KPC_DATA_COL		(0x7 << 0)
 #define STMPE_KPC_DATA_NOKEY_MASK	0x78

 #define STMPE_KEYPAD_MAX_DEBOUNCE	127
 #define STMPE_KEYPAD_MAX_SCAN_COUNT	15

 #define STMPE_KEYPAD_MAX_ROWS		8
 #define STMPE_KEYPAD_MAX_COLS		8
 #define STMPE_KEYPAD_ROW_SHIFT		3
 #define STMPE_KEYPAD_KEYMAP_SIZE	\
 	(STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)

 /**
  * struct stmpe_keypad_variant - model-specific attributes
  * @auto_increment: whether the KPC_DATA_BYTE register address
  *		    auto-increments on multiple read
  * @num_data: number of data bytes
  * @num_normal_data: number of normal keys' data bytes
  * @max_cols: maximum number of columns supported
  * @max_rows: maximum number of rows supported
  * @col_gpios: bitmask of gpios which can be used for columns
  * @row_gpios: bitmask of gpios which can be used for rows
  */
 struct stmpe_keypad_variant {
 	bool		auto_increment;
 	int		num_data;
 	int		num_normal_data;
 	int		max_cols;
 	int		max_rows;
 	unsigned int	col_gpios;
 	unsigned int	row_gpios;
 };

 static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
 	[STMPE1601] = {
 		.auto_increment		= true,
 		.num_data		= 5,
 		.num_normal_data	= 3,
 		.max_cols		= 8,
 		.max_rows		= 8,
 		.col_gpios		= 0x000ff,	/* GPIO 0 - 7 */
 		.row_gpios		= 0x0ff00,	/* GPIO 8 - 15 */
 	},
 	[STMPE2401] = {
 		.auto_increment		= false,
 		.num_data		= 3,
 		.num_normal_data	= 2,
 		.max_cols		= 8,
 		.max_rows		= 12,
 		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
 		.row_gpios		= 0x1fef00,	/* GPIO 8-14, 16-20 */
 	},
 	[STMPE2403] = {
 		.auto_increment		= true,
 		.num_data		= 5,
 		.num_normal_data	= 3,
 		.max_cols		= 8,
 		.max_rows		= 12,
 		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
 		.row_gpios		= 0x1fef00,	/* GPIO 8-14, 16-20 */
 	},
 };

 struct stmpe_keypad {
 	struct stmpe *stmpe;
 	struct input_dev *input;
 	const struct stmpe_keypad_variant *variant;
 	const struct stmpe_keypad_platform_data *plat;

 	unsigned int rows;
 	unsigned int cols;

 	unsigned short keymap[STMPE_KEYPAD_KEYMAP_SIZE];
 };

 static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
 {
 	const struct stmpe_keypad_variant *variant = keypad->variant;
 	struct stmpe *stmpe = keypad->stmpe;
 	int ret;
 	int i;

 	if (variant->auto_increment)
 		return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
 					variant->num_data, data);

 	for (i = 0; i < variant->num_data; i++) {
 		ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
 		if (ret < 0)
 			return ret;

 		data[i] = ret;
 	}

 	return 0;
 }

 static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
 {
 	struct stmpe_keypad *keypad = dev;
 	struct input_dev *input = keypad->input;
 	const struct stmpe_keypad_variant *variant = keypad->variant;
 	u8 fifo[variant->num_data];
 	int ret;
 	int i;

 	ret = stmpe_keypad_read_data(keypad, fifo);
 	if (ret < 0)
 		return IRQ_NONE;

 	for (i = 0; i < variant->num_normal_data; i++) {
 		u8 data = fifo[i];
 		int row = (data & STMPE_KPC_DATA_ROW) >> 3;
 		int col = data & STMPE_KPC_DATA_COL;
 		int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
 		bool up = data & STMPE_KPC_DATA_UP;

 		if ((data & STMPE_KPC_DATA_NOKEY_MASK)
 			== STMPE_KPC_DATA_NOKEY_MASK)
 			continue;

 		input_event(input, EV_MSC, MSC_SCAN, code);
 		input_report_key(input, keypad->keymap[code], !up);
 		input_sync(input);
 	}

 	return IRQ_HANDLED;
 }

 static int __devinit stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
 {
 	const struct stmpe_keypad_variant *variant = keypad->variant;
 	unsigned int col_gpios = variant->col_gpios;
 	unsigned int row_gpios = variant->row_gpios;
 	struct stmpe *stmpe = keypad->stmpe;
 	unsigned int pins = 0;
 	int i;

 	/*
 	 * Figure out which pins need to be set to the keypad alternate
 	 * function.
 	 *
 	 * {cols,rows}_gpios are bitmasks of which pins on the chip can be used
 	 * for the keypad.
 	 *
 	 * keypad->{cols,rows} are a bitmask of which pins (of the ones useable
 	 * for the keypad) are used on the board.
 	 */

 	for (i = 0; i < variant->max_cols; i++) {
 		int num = __ffs(col_gpios);

 		if (keypad->cols & (1 << i))
 			pins |= 1 << num;

 		col_gpios &= ~(1 << num);
 	}

 	for (i = 0; i < variant->max_rows; i++) {
 		int num = __ffs(row_gpios);

 		if (keypad->rows & (1 << i))
 			pins |= 1 << num;

 		row_gpios &= ~(1 << num);
 	}

 	return stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
 }

 static int __devinit stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
 {
 	const struct stmpe_keypad_platform_data *plat = keypad->plat;
 	const struct stmpe_keypad_variant *variant = keypad->variant;
 	struct stmpe *stmpe = keypad->stmpe;
 	int ret;

 	if (plat->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
 		return -EINVAL;

 	if (plat->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
 		return -EINVAL;

 	ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
 	if (ret < 0)
 		return ret;

 	ret = stmpe_keypad_altfunc_init(keypad);
 	if (ret < 0)
 		return ret;

 	ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
 	if (ret < 0)
 		return ret;

 	ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
 	if (ret < 0)
 		return ret;

 	if (variant->max_rows > 8) {
 		ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
 				     STMPE_KPC_ROW_MSB_ROWS,
 				     keypad->rows >> 8);
 		if (ret < 0)
 			return ret;
 	}

 	ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
 			     STMPE_KPC_CTRL_MSB_SCAN_COUNT,
 			     plat->scan_count << 4);
 	if (ret < 0)
 		return ret;

 	return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
 			      STMPE_KPC_CTRL_LSB_SCAN |
 			      STMPE_KPC_CTRL_LSB_DEBOUNCE,
 			      STMPE_KPC_CTRL_LSB_SCAN |
 			      (plat->debounce_ms << 1));
 }

 static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
 {
 	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
 	struct stmpe_keypad_platform_data *plat;
 	struct stmpe_keypad *keypad;
 	struct input_dev *input;
 	int ret;
 	int irq;
 	int i;

 	plat = stmpe->pdata->keypad;
 	if (!plat)
 		return -ENODEV;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	keypad = kzalloc(sizeof(struct stmpe_keypad), GFP_KERNEL);
 	if (!keypad)
 		return -ENOMEM;

 	input = input_allocate_device();
 	if (!input) {
 		ret = -ENOMEM;
 		goto out_freekeypad;
 	}

 	input->name = "STMPE keypad";
 	input->id.bustype = BUS_I2C;
 	input->dev.parent = &pdev->dev;

 	ret = matrix_keypad_build_keymap(plat->keymap_data, NULL,
 					 STMPE_KEYPAD_MAX_ROWS,
 					 STMPE_KEYPAD_MAX_COLS,
 					 keypad->keymap, input);
 	if (ret)
 		goto out_freeinput;

 	input_set_capability(input, EV_MSC, MSC_SCAN);
 	if (!plat->no_autorepeat)
 		__set_bit(EV_REP, input->evbit);

 	for (i = 0; i < plat->keymap_data->keymap_size; i++) {
 		unsigned int key = plat->keymap_data->keymap[i];

 		keypad->cols |= 1 << KEY_COL(key);
 		keypad->rows |= 1 << KEY_ROW(key);
 	}

 	keypad->stmpe = stmpe;
 	keypad->plat = plat;
 	keypad->input = input;
 	keypad->variant = &stmpe_keypad_variants[stmpe->partnum];

 	ret = stmpe_keypad_chip_init(keypad);
 	if (ret < 0)
 		goto out_freeinput;

 	ret = input_register_device(input);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"unable to register input device: %d\n", ret);
 		goto out_freeinput;
 	}

 	ret = request_threaded_irq(irq, NULL, stmpe_keypad_irq, IRQF_ONESHOT,
 				   "stmpe-keypad", keypad);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
 		goto out_unregisterinput;
 	}

 	platform_set_drvdata(pdev, keypad);

 	return 0;

 out_unregisterinput:
 	input_unregister_device(input);
 	input = NULL;
 out_freeinput:
 	input_free_device(input);
 out_freekeypad:
 	kfree(keypad);
 	return ret;
 }

 static int __devexit stmpe_keypad_remove(struct platform_device *pdev)
 {
 	struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
 	struct stmpe *stmpe = keypad->stmpe;
 	int irq = platform_get_irq(pdev, 0);

 	stmpe_disable(stmpe, STMPE_BLOCK_KEYPAD);

 	free_irq(irq, keypad);
 	input_unregister_device(keypad->input);
 	platform_set_drvdata(pdev, NULL);
 	kfree(keypad);

 	return 0;
 }

 static struct platform_driver stmpe_keypad_driver = {
 	.driver.name	= "stmpe-keypad",
 	.driver.owner	= THIS_MODULE,
 	.probe		= stmpe_keypad_probe,
 	.remove		= __devexit_p(stmpe_keypad_remove),
 };
 module_platform_driver(stmpe_keypad_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("STMPExxxx keypad driver");
 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
	/*
	* Copyright (C) ST-Ericsson SA 2010
	*
	* License Terms: GNU General Public License, version 2
	* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/input/matrix_keypad.h>
	#include <linux/mfd/stmpe.h>

	/* These are at the same addresses in all STMPE variants */
	#define STMPE_KPC_COL 0x60
	#define STMPE_KPC_ROW_MSB 0x61
	#define STMPE_KPC_ROW_LSB 0x62
	#define STMPE_KPC_CTRL_MSB 0x63
	#define STMPE_KPC_CTRL_LSB 0x64
	#define STMPE_KPC_COMBI_KEY_0 0x65
	#define STMPE_KPC_COMBI_KEY_1 0x66
	#define STMPE_KPC_COMBI_KEY_2 0x67
	#define STMPE_KPC_DATA_BYTE0 0x68
	#define STMPE_KPC_DATA_BYTE1 0x69
	#define STMPE_KPC_DATA_BYTE2 0x6a
	#define STMPE_KPC_DATA_BYTE3 0x6b
	#define STMPE_KPC_DATA_BYTE4 0x6c

	#define STMPE_KPC_CTRL_LSB_SCAN (0x1 << 0)
	#define STMPE_KPC_CTRL_LSB_DEBOUNCE (0x7f << 1)
	#define STMPE_KPC_CTRL_MSB_SCAN_COUNT (0xf << 4)

	#define STMPE_KPC_ROW_MSB_ROWS 0xff

	#define STMPE_KPC_DATA_UP (0x1 << 7)
	#define STMPE_KPC_DATA_ROW (0xf << 3)
	#define STMPE_KPC_DATA_COL (0x7 << 0)
	#define STMPE_KPC_DATA_NOKEY_MASK 0x78

	#define STMPE_KEYPAD_MAX_DEBOUNCE 127
	#define STMPE_KEYPAD_MAX_SCAN_COUNT 15

	#define STMPE_KEYPAD_MAX_ROWS 8
	#define STMPE_KEYPAD_MAX_COLS 8
	#define STMPE_KEYPAD_ROW_SHIFT 3
	#define STMPE_KEYPAD_KEYMAP_SIZE \
	(STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)

	/**
	* struct stmpe_keypad_variant - model-specific attributes
	* @auto_increment: whether the KPC_DATA_BYTE register address
	* auto-increments on multiple read
	* @num_data: number of data bytes
	* @num_normal_data: number of normal keys' data bytes
	* @max_cols: maximum number of columns supported
	* @max_rows: maximum number of rows supported
	* @col_gpios: bitmask of gpios which can be used for columns
	* @row_gpios: bitmask of gpios which can be used for rows
	*/
	struct stmpe_keypad_variant {
	bool auto_increment;
	int num_data;
	int num_normal_data;
	int max_cols;
	int max_rows;
	unsigned int col_gpios;
	unsigned int row_gpios;
	};

	static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
	[STMPE1601] = {
	.auto_increment = true,
	.num_data = 5,
	.num_normal_data = 3,
	.max_cols = 8,
	.max_rows = 8,
	.col_gpios = 0x000ff, /* GPIO 0 - 7 */
	.row_gpios = 0x0ff00, /* GPIO 8 - 15 */
	},
	[STMPE2401] = {
	.auto_increment = false,
	.num_data = 3,
	.num_normal_data = 2,
	.max_cols = 8,
	.max_rows = 12,
	.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
	.row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */
	},
	[STMPE2403] = {
	.auto_increment = true,
	.num_data = 5,
	.num_normal_data = 3,
	.max_cols = 8,
	.max_rows = 12,
	.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
	.row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */
	},
	};

	struct stmpe_keypad {
	struct stmpe *stmpe;
	struct input_dev *input;
	const struct stmpe_keypad_variant *variant;
	const struct stmpe_keypad_platform_data *plat;

	unsigned int rows;
	unsigned int cols;

	unsigned short keymap[STMPE_KEYPAD_KEYMAP_SIZE];
	};

	static int stmpe_keypad_read_data(struct stmpe_keypad keypad, u8 data)
	{
	const struct stmpe_keypad_variant *variant = keypad->variant;
	struct stmpe *stmpe = keypad->stmpe;
	int ret;
	int i;

	if (variant->auto_increment)
	return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
	variant->num_data, data);

	for (i = 0; i < variant->num_data; i++) {
	ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
	if (ret < 0)
	return ret;

	data[i] = ret;
	}

	return 0;
	}

	static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
	{
	struct stmpe_keypad *keypad = dev;
	struct input_dev *input = keypad->input;
	const struct stmpe_keypad_variant *variant = keypad->variant;
	u8 fifo[variant->num_data];
	int ret;
	int i;

	ret = stmpe_keypad_read_data(keypad, fifo);
	if (ret < 0)
	return IRQ_NONE;

	for (i = 0; i < variant->num_normal_data; i++) {
	u8 data = fifo[i];
	int row = (data & STMPE_KPC_DATA_ROW) >> 3;
	int col = data & STMPE_KPC_DATA_COL;
	int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
	bool up = data & STMPE_KPC_DATA_UP;

	if ((data & STMPE_KPC_DATA_NOKEY_MASK)
	== STMPE_KPC_DATA_NOKEY_MASK)
	continue;

	input_event(input, EV_MSC, MSC_SCAN, code);
	input_report_key(input, keypad->keymap[code], !up);
	input_sync(input);
	}

	return IRQ_HANDLED;
	}

	static int __devinit stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
	{
	const struct stmpe_keypad_variant *variant = keypad->variant;
	unsigned int col_gpios = variant->col_gpios;
	unsigned int row_gpios = variant->row_gpios;
	struct stmpe *stmpe = keypad->stmpe;
	unsigned int pins = 0;
	int i;

	/*
	* Figure out which pins need to be set to the keypad alternate
	* function.
	*
	* {cols,rows}_gpios are bitmasks of which pins on the chip can be used
	* for the keypad.
	*
	* keypad->{cols,rows} are a bitmask of which pins (of the ones useable
	* for the keypad) are used on the board.
	*/

	for (i = 0; i < variant->max_cols; i++) {
	int num = __ffs(col_gpios);

	if (keypad->cols & (1 << i))
	pins \|= 1 << num;

	col_gpios &= ~(1 << num);
	}

	for (i = 0; i < variant->max_rows; i++) {
	int num = __ffs(row_gpios);

	if (keypad->rows & (1 << i))
	pins \|= 1 << num;

	row_gpios &= ~(1 << num);
	}

	return stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
	}

	static int __devinit stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
	{
	const struct stmpe_keypad_platform_data *plat = keypad->plat;
	const struct stmpe_keypad_variant *variant = keypad->variant;
	struct stmpe *stmpe = keypad->stmpe;
	int ret;

	if (plat->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
	return -EINVAL;

	if (plat->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
	return -EINVAL;

	ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
	if (ret < 0)
	return ret;

	ret = stmpe_keypad_altfunc_init(keypad);
	if (ret < 0)
	return ret;

	ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
	if (ret < 0)
	return ret;

	ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
	if (ret < 0)
	return ret;

	if (variant->max_rows > 8) {
	ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
	STMPE_KPC_ROW_MSB_ROWS,
	keypad->rows >> 8);
	if (ret < 0)
	return ret;
	}

	ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
	STMPE_KPC_CTRL_MSB_SCAN_COUNT,
	plat->scan_count << 4);
	if (ret < 0)
	return ret;

	return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
	STMPE_KPC_CTRL_LSB_SCAN \|
	STMPE_KPC_CTRL_LSB_DEBOUNCE,
	STMPE_KPC_CTRL_LSB_SCAN \|
	(plat->debounce_ms << 1));
	}

	static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
	{
	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
	struct stmpe_keypad_platform_data *plat;
	struct stmpe_keypad *keypad;
	struct input_dev *input;
	int ret;
	int irq;
	int i;

	plat = stmpe->pdata->keypad;
	if (!plat)
	return -ENODEV;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	keypad = kzalloc(sizeof(struct stmpe_keypad), GFP_KERNEL);
	if (!keypad)
	return -ENOMEM;

	input = input_allocate_device();
	if (!input) {
	ret = -ENOMEM;
	goto out_freekeypad;
	}

	input->name = "STMPE keypad";
	input->id.bustype = BUS_I2C;
	input->dev.parent = &pdev->dev;

	ret = matrix_keypad_build_keymap(plat->keymap_data, NULL,
	STMPE_KEYPAD_MAX_ROWS,
	STMPE_KEYPAD_MAX_COLS,
	keypad->keymap, input);
	if (ret)
	goto out_freeinput;

	input_set_capability(input, EV_MSC, MSC_SCAN);
	if (!plat->no_autorepeat)
	__set_bit(EV_REP, input->evbit);

	for (i = 0; i < plat->keymap_data->keymap_size; i++) {
	unsigned int key = plat->keymap_data->keymap[i];

	keypad->cols \|= 1 << KEY_COL(key);
	keypad->rows \|= 1 << KEY_ROW(key);
	}

	keypad->stmpe = stmpe;
	keypad->plat = plat;
	keypad->input = input;
	keypad->variant = &stmpe_keypad_variants[stmpe->partnum];

	ret = stmpe_keypad_chip_init(keypad);
	if (ret < 0)
	goto out_freeinput;

	ret = input_register_device(input);
	if (ret) {
	dev_err(&pdev->dev,
	"unable to register input device: %d\n", ret);
	goto out_freeinput;
	}

	ret = request_threaded_irq(irq, NULL, stmpe_keypad_irq, IRQF_ONESHOT,
	"stmpe-keypad", keypad);
	if (ret) {
	dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
	goto out_unregisterinput;
	}

	platform_set_drvdata(pdev, keypad);

	return 0;

	out_unregisterinput:
	input_unregister_device(input);
	input = NULL;
	out_freeinput:
	input_free_device(input);
	out_freekeypad:
	kfree(keypad);
	return ret;
	}

	static int __devexit stmpe_keypad_remove(struct platform_device *pdev)
	{
	struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
	struct stmpe *stmpe = keypad->stmpe;
	int irq = platform_get_irq(pdev, 0);

	stmpe_disable(stmpe, STMPE_BLOCK_KEYPAD);

	free_irq(irq, keypad);
	input_unregister_device(keypad->input);
	platform_set_drvdata(pdev, NULL);
	kfree(keypad);

	return 0;
	}

	static struct platform_driver stmpe_keypad_driver = {
	.driver.name = "stmpe-keypad",
	.driver.owner = THIS_MODULE,
	.probe = stmpe_keypad_probe,
	.remove = __devexit_p(stmpe_keypad_remove),
	};
	module_platform_driver(stmpe_keypad_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("STMPExxxx keypad driver");
	MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");