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/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_MAX_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
  * @set_pullup: whether the pins need to have their pull-ups set
  * @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;
 	bool		set_pullup;
 	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,
 		.set_pullup		= true,
 		.num_data		= 3,
 		.num_normal_data	= 2,
 		.max_cols		= 8,
 		.max_rows		= 12,
 		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
 		.row_gpios		= 0x1f7f00,	/* GPIO 8-14, 16-20 */
 	},
 	[STMPE2403] = {
 		.auto_increment		= true,
 		.set_pullup		= 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 - STMPE keypad state container
  * @stmpe: pointer to parent STMPE device
  * @input: spawned input device
  * @variant: STMPE variant
  * @debounce_ms: debounce interval, in ms.  Maximum is
  *		 %STMPE_KEYPAD_MAX_DEBOUNCE.
  * @scan_count: number of key scanning cycles to confirm key data.
  *		Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
  * @no_autorepeat: disable key autorepeat
  * @rows: bitmask for the rows
  * @cols: bitmask for the columns
  * @keymap: the keymap
  */
 struct stmpe_keypad {
 	struct stmpe *stmpe;
 	struct input_dev *input;
 	const struct stmpe_keypad_variant *variant;
 	unsigned int debounce_ms;
 	unsigned int scan_count;
 	bool no_autorepeat;
 	unsigned int rows;
 	unsigned int cols;
 	unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_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 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;
 	u8 pureg = stmpe->regs[STMPE_IDX_GPPUR_LSB];
 	unsigned int pins = 0;
 	unsigned int pu_pins = 0;
 	int ret;
 	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;
 			pu_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);
 	}

 	ret = stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
 	if (ret)
 		return ret;

 	/*
 	 * On STMPE24xx, set pin bias to pull-up on all keypad input
 	 * pins (columns), this incidentally happen to be maximum 8 pins
 	 * and placed at GPIO0-7 so only the LSB of the pull up register
 	 * ever needs to be written.
 	 */
 	if (variant->set_pullup) {
 		u8 val;

 		ret = stmpe_reg_read(stmpe, pureg);
 		if (ret)
 			return ret;

 		/* Do not touch unused pins, may be used for GPIO */
 		val = ret & ~pu_pins;
 		val |= pu_pins;

 		ret = stmpe_reg_write(stmpe, pureg, val);
 	}

 	return 0;
 }

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

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

 	if (keypad->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,
 			     keypad->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 |
 			      (keypad->debounce_ms << 1));
 }

 static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad,
 					u32 used_rows, u32 used_cols)
 {
 	int row, col;

 	for (row = 0; row < used_rows; row++) {
 		for (col = 0; col < used_cols; col++) {
 			int code = MATRIX_SCAN_CODE(row, col,
 						    STMPE_KEYPAD_ROW_SHIFT);
 			if (keypad->keymap[code] != KEY_RESERVED) {
 				keypad->rows |= 1 << row;
 				keypad->cols |= 1 << col;
 			}
 		}
 	}
 }

 static int stmpe_keypad_probe(struct platform_device *pdev)
 {
 	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *np = pdev->dev.of_node;
 	struct stmpe_keypad *keypad;
 	struct input_dev *input;
 	u32 rows;
 	u32 cols;
 	int error;
 	int irq;

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

 	keypad = devm_kzalloc(&pdev->dev, sizeof(struct stmpe_keypad),
 			      GFP_KERNEL);
 	if (!keypad)
 		return -ENOMEM;

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

 	of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms);
 	of_property_read_u32(np, "st,scan-count", &keypad->scan_count);
 	keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");

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

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

 	error = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
 	if (error)
 		return error;

 	error = matrix_keypad_build_keymap(NULL, NULL, rows, cols,
 					   keypad->keymap, input);
 	if (error)
 		return error;

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

 	stmpe_keypad_fill_used_pins(keypad, rows, cols);

 	keypad->input = input;

 	error = stmpe_keypad_chip_init(keypad);
 	if (error < 0)
 		return error;

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

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

 	platform_set_drvdata(pdev, keypad);

 	return 0;
 }

 static int stmpe_keypad_remove(struct platform_device *pdev)
 {
 	struct stmpe_keypad *keypad = platform_get_drvdata(pdev);

 	stmpe_disable(keypad->stmpe, STMPE_BLOCK_KEYPAD);

 	return 0;
 }

 static struct platform_driver stmpe_keypad_driver = {
 	.driver.name	= "stmpe-keypad",
 	.driver.owner	= THIS_MODULE,
 	.probe		= stmpe_keypad_probe,
 	.remove		= 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/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_MAX_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
	* @set_pullup: whether the pins need to have their pull-ups set
	* @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;
	bool set_pullup;
	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,
	.set_pullup = true,
	.num_data = 3,
	.num_normal_data = 2,
	.max_cols = 8,
	.max_rows = 12,
	.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
	.row_gpios = 0x1f7f00, /* GPIO 8-14, 16-20 */
	},
	[STMPE2403] = {
	.auto_increment = true,
	.set_pullup = 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 - STMPE keypad state container
	* @stmpe: pointer to parent STMPE device
	* @input: spawned input device
	* @variant: STMPE variant
	* @debounce_ms: debounce interval, in ms. Maximum is
	* %STMPE_KEYPAD_MAX_DEBOUNCE.
	* @scan_count: number of key scanning cycles to confirm key data.
	* Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
	* @no_autorepeat: disable key autorepeat
	* @rows: bitmask for the rows
	* @cols: bitmask for the columns
	* @keymap: the keymap
	*/
	struct stmpe_keypad {
	struct stmpe *stmpe;
	struct input_dev *input;
	const struct stmpe_keypad_variant *variant;
	unsigned int debounce_ms;
	unsigned int scan_count;
	bool no_autorepeat;
	unsigned int rows;
	unsigned int cols;
	unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_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 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;
	u8 pureg = stmpe->regs[STMPE_IDX_GPPUR_LSB];
	unsigned int pins = 0;
	unsigned int pu_pins = 0;
	int ret;
	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;
	pu_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);
	}

	ret = stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
	if (ret)
	return ret;

	/*
	* On STMPE24xx, set pin bias to pull-up on all keypad input
	* pins (columns), this incidentally happen to be maximum 8 pins
	* and placed at GPIO0-7 so only the LSB of the pull up register
	* ever needs to be written.
	*/
	if (variant->set_pullup) {
	u8 val;

	ret = stmpe_reg_read(stmpe, pureg);
	if (ret)
	return ret;

	/* Do not touch unused pins, may be used for GPIO */
	val = ret & ~pu_pins;
	val \|= pu_pins;

	ret = stmpe_reg_write(stmpe, pureg, val);
	}

	return 0;
	}

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

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

	if (keypad->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,
	keypad->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 \|
	(keypad->debounce_ms << 1));
	}

	static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad,
	u32 used_rows, u32 used_cols)
	{
	int row, col;

	for (row = 0; row < used_rows; row++) {
	for (col = 0; col < used_cols; col++) {
	int code = MATRIX_SCAN_CODE(row, col,
	STMPE_KEYPAD_ROW_SHIFT);
	if (keypad->keymap[code] != KEY_RESERVED) {
	keypad->rows \|= 1 << row;
	keypad->cols \|= 1 << col;
	}
	}
	}
	}

	static int stmpe_keypad_probe(struct platform_device *pdev)
	{
	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
	struct device_node *np = pdev->dev.of_node;
	struct stmpe_keypad *keypad;
	struct input_dev *input;
	u32 rows;
	u32 cols;
	int error;
	int irq;

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

	keypad = devm_kzalloc(&pdev->dev, sizeof(struct stmpe_keypad),
	GFP_KERNEL);
	if (!keypad)
	return -ENOMEM;

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

	of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms);
	of_property_read_u32(np, "st,scan-count", &keypad->scan_count);
	keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");

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

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

	error = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
	if (error)
	return error;

	error = matrix_keypad_build_keymap(NULL, NULL, rows, cols,
	keypad->keymap, input);
	if (error)
	return error;

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

	stmpe_keypad_fill_used_pins(keypad, rows, cols);

	keypad->input = input;

	error = stmpe_keypad_chip_init(keypad);
	if (error < 0)
	return error;

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

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

	platform_set_drvdata(pdev, keypad);

	return 0;
	}

	static int stmpe_keypad_remove(struct platform_device *pdev)
	{
	struct stmpe_keypad *keypad = platform_get_drvdata(pdev);

	stmpe_disable(keypad->stmpe, STMPE_BLOCK_KEYPAD);

	return 0;
	}

	static struct platform_driver stmpe_keypad_driver = {
	.driver.name = "stmpe-keypad",
	.driver.owner = THIS_MODULE,
	.probe = stmpe_keypad_probe,
	.remove = 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>");