[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / input / keyboard / tca8418_keypad.c

/*
 * Driver for TCA8418 I2C keyboard
 *
 * Copyright (C) 2011 Fuel7, Inc.  All rights reserved.
 *
 * Author: Kyle Manna <kyle.manna@fuel7.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 *
 * If you can't comply with GPLv2, alternative licensing terms may be
 * arranged. Please contact Fuel7, Inc. (http://fuel7.com/) for proprietary
 * alternative licensing inquiries.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/tca8418_keypad.h>
#include <linux/of.h>

/* TCA8418 hardware limits */
#define TCA8418_MAX_ROWS	8
#define TCA8418_MAX_COLS	10

/* TCA8418 register offsets */
#define REG_CFG			0x01
#define REG_INT_STAT		0x02
#define REG_KEY_LCK_EC		0x03
#define REG_KEY_EVENT_A		0x04
#define REG_KEY_EVENT_B		0x05
#define REG_KEY_EVENT_C		0x06
#define REG_KEY_EVENT_D		0x07
#define REG_KEY_EVENT_E		0x08
#define REG_KEY_EVENT_F		0x09
#define REG_KEY_EVENT_G		0x0A
#define REG_KEY_EVENT_H		0x0B
#define REG_KEY_EVENT_I		0x0C
#define REG_KEY_EVENT_J		0x0D
#define REG_KP_LCK_TIMER	0x0E
#define REG_UNLOCK1		0x0F
#define REG_UNLOCK2		0x10
#define REG_GPIO_INT_STAT1	0x11
#define REG_GPIO_INT_STAT2	0x12
#define REG_GPIO_INT_STAT3	0x13
#define REG_GPIO_DAT_STAT1	0x14
#define REG_GPIO_DAT_STAT2	0x15
#define REG_GPIO_DAT_STAT3	0x16
#define REG_GPIO_DAT_OUT1	0x17
#define REG_GPIO_DAT_OUT2	0x18
#define REG_GPIO_DAT_OUT3	0x19
#define REG_GPIO_INT_EN1	0x1A
#define REG_GPIO_INT_EN2	0x1B
#define REG_GPIO_INT_EN3	0x1C
#define REG_KP_GPIO1		0x1D
#define REG_KP_GPIO2		0x1E
#define REG_KP_GPIO3		0x1F
#define REG_GPI_EM1		0x20
#define REG_GPI_EM2		0x21
#define REG_GPI_EM3		0x22
#define REG_GPIO_DIR1		0x23
#define REG_GPIO_DIR2		0x24
#define REG_GPIO_DIR3		0x25
#define REG_GPIO_INT_LVL1	0x26
#define REG_GPIO_INT_LVL2	0x27
#define REG_GPIO_INT_LVL3	0x28
#define REG_DEBOUNCE_DIS1	0x29
#define REG_DEBOUNCE_DIS2	0x2A
#define REG_DEBOUNCE_DIS3	0x2B
#define REG_GPIO_PULL1		0x2C
#define REG_GPIO_PULL2		0x2D
#define REG_GPIO_PULL3		0x2E

/* TCA8418 bit definitions */
#define CFG_AI			BIT(7)
#define CFG_GPI_E_CFG		BIT(6)
#define CFG_OVR_FLOW_M		BIT(5)
#define CFG_INT_CFG		BIT(4)
#define CFG_OVR_FLOW_IEN	BIT(3)
#define CFG_K_LCK_IEN		BIT(2)
#define CFG_GPI_IEN		BIT(1)
#define CFG_KE_IEN		BIT(0)

#define INT_STAT_CAD_INT	BIT(4)
#define INT_STAT_OVR_FLOW_INT	BIT(3)
#define INT_STAT_K_LCK_INT	BIT(2)
#define INT_STAT_GPI_INT	BIT(1)
#define INT_STAT_K_INT		BIT(0)

/* TCA8418 register masks */
#define KEY_LCK_EC_KEC		0x7
#define KEY_EVENT_CODE		0x7f
#define KEY_EVENT_VALUE		0x80


static const struct i2c_device_id tca8418_id[] = {
	{ TCA8418_NAME, 8418, },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tca8418_id);

#ifdef CONFIG_OF
static const struct of_device_id tca8418_dt_ids[] __devinitconst = {
	{ .compatible = "ti,tca8418", },
	{ }
};
MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
#endif

struct tca8418_keypad {
	unsigned int irq;
	unsigned int row_shift;

	struct i2c_client *client;
	struct input_dev *input;

	/* Flexible array member, must be at end of struct */
	unsigned short keymap[];
};

/*
 * Write a byte to the TCA8418
 */
static int tca8418_write_byte(struct tca8418_keypad *keypad_data,
			      int reg, u8 val)
{
	int error;

	error = i2c_smbus_write_byte_data(keypad_data->client, reg, val);
	if (error < 0) {
		dev_err(&keypad_data->client->dev,
			"%s failed, reg: %d, val: %d, error: %d\n",
			__func__, reg, val, error);
		return error;
	}

	return 0;
}

/*
 * Read a byte from the TCA8418
 */
static int tca8418_read_byte(struct tca8418_keypad *keypad_data,
			     int reg, u8 *val)
{
	int error;

	error = i2c_smbus_read_byte_data(keypad_data->client, reg);
	if (error < 0) {
		dev_err(&keypad_data->client->dev,
				"%s failed, reg: %d, error: %d\n",
				__func__, reg, error);
		return error;
	}

	*val = (u8)error;

	return 0;
}

static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
{
	int error, col, row;
	u8 reg, state, code;

	/* Initial read of the key event FIFO */
	error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);

	/* Assume that key code 0 signifies empty FIFO */
	while (error >= 0 && reg > 0) {
		state = reg & KEY_EVENT_VALUE;
		code  = reg & KEY_EVENT_CODE;

		row = code / TCA8418_MAX_COLS;
		col = code % TCA8418_MAX_COLS;

		row = (col) ? row : row - 1;
		col = (col) ? col - 1 : TCA8418_MAX_COLS - 1;

		code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);
		input_event(keypad_data->input, EV_MSC, MSC_SCAN, code);
		input_report_key(keypad_data->input,
				keypad_data->keymap[code], state);

		/* Read for next loop */
		error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);
	}

	if (error < 0)
		dev_err(&keypad_data->client->dev,
			"unable to read REG_KEY_EVENT_A\n");

	input_sync(keypad_data->input);
}

/*
 * Threaded IRQ handler and this can (and will) sleep.
 */
static irqreturn_t tca8418_irq_handler(int irq, void *dev_id)
{
	struct tca8418_keypad *keypad_data = dev_id;
	u8 reg;
	int error;

	error = tca8418_read_byte(keypad_data, REG_INT_STAT, &reg);
	if (error) {
		dev_err(&keypad_data->client->dev,
			"unable to read REG_INT_STAT\n");
		return IRQ_NONE;
	}

	if (!reg)
		return IRQ_NONE;

	if (reg & INT_STAT_OVR_FLOW_INT)
		dev_warn(&keypad_data->client->dev, "overflow occurred\n");

	if (reg & INT_STAT_K_INT)
		tca8418_read_keypad(keypad_data);

	/* Clear all interrupts, even IRQs we didn't check (GPI, CAD, LCK) */
	reg = 0xff;
	error = tca8418_write_byte(keypad_data, REG_INT_STAT, reg);
	if (error)
		dev_err(&keypad_data->client->dev,
			"unable to clear REG_INT_STAT\n");

	return IRQ_HANDLED;
}

/*
 * Configure the TCA8418 for keypad operation
 */
static int tca8418_configure(struct tca8418_keypad *keypad_data,
			     u32 rows, u32 cols)
{
	int reg, error;

	/* Write config register, if this fails assume device not present */
	error = tca8418_write_byte(keypad_data, REG_CFG,
				CFG_INT_CFG | CFG_OVR_FLOW_IEN | CFG_KE_IEN);
	if (error < 0)
		return -ENODEV;


	/* Assemble a mask for row and column registers */
	reg  =  ~(~0 << rows);
	reg += (~(~0 << cols)) << 8;

	/* Set registers to keypad mode */
	error |= tca8418_write_byte(keypad_data, REG_KP_GPIO1, reg);
	error |= tca8418_write_byte(keypad_data, REG_KP_GPIO2, reg >> 8);
	error |= tca8418_write_byte(keypad_data, REG_KP_GPIO3, reg >> 16);

	/* Enable column debouncing */
	error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS1, reg);
	error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS2, reg >> 8);
	error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS3, reg >> 16);

	return error;
}

static int tca8418_keypad_probe(struct i2c_client *client,
					  const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	const struct tca8418_keypad_platform_data *pdata =
						dev_get_platdata(dev);
	struct tca8418_keypad *keypad_data;
	struct input_dev *input;
	const struct matrix_keymap_data *keymap_data = NULL;
	u32 rows = 0, cols = 0;
	bool rep = false;
	bool irq_is_gpio = false;
	int error, row_shift, max_keys;

	/* Copy the platform data */
	if (pdata) {
		if (!pdata->keymap_data) {
			dev_err(dev, "no keymap data defined\n");
			return -EINVAL;
		}
		keymap_data = pdata->keymap_data;
		rows = pdata->rows;
		cols = pdata->cols;
		rep  = pdata->rep;
		irq_is_gpio = pdata->irq_is_gpio;
	} else {
		struct device_node *np = dev->of_node;
		of_property_read_u32(np, "keypad,num-rows", &rows);
		of_property_read_u32(np, "keypad,num-columns", &cols);
		rep = of_property_read_bool(np, "keypad,autorepeat");
	}

	if (!rows || rows > TCA8418_MAX_ROWS) {
		dev_err(dev, "invalid rows\n");
		return -EINVAL;
	}

	if (!cols || cols > TCA8418_MAX_COLS) {
		dev_err(dev, "invalid columns\n");
		return -EINVAL;
	}

	/* Check i2c driver capabilities */
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
		dev_err(dev, "%s adapter not supported\n",
			dev_driver_string(&client->adapter->dev));
		return -ENODEV;
	}

	row_shift = get_count_order(cols);
	max_keys = rows << row_shift;

	/* Allocate memory for keypad_data, keymap and input device */
	keypad_data = kzalloc(sizeof(*keypad_data) +
			max_keys * sizeof(keypad_data->keymap[0]), GFP_KERNEL);
	if (!keypad_data)
		return -ENOMEM;

	keypad_data->client = client;
	keypad_data->row_shift = row_shift;

	/* Initialize the chip or fail if chip isn't present */
	error = tca8418_configure(keypad_data, rows, cols);
	if (error < 0)
		goto fail1;

	/* Configure input device */
	input = input_allocate_device();
	if (!input) {
		error = -ENOMEM;
		goto fail1;
	}
	keypad_data->input = input;

	input->name = client->name;
	input->dev.parent = &client->dev;

	input->id.bustype = BUS_I2C;
	input->id.vendor  = 0x0001;
	input->id.product = 0x001;
	input->id.version = 0x0001;

	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
					   keypad_data->keymap, input);
	if (error) {
		dev_dbg(dev, "Failed to build keymap\n");
		goto fail2;
	}

	if (rep)
		__set_bit(EV_REP, input->evbit);
	input_set_capability(input, EV_MSC, MSC_SCAN);

	input_set_drvdata(input, keypad_data);

	if (irq_is_gpio)
		client->irq = gpio_to_irq(client->irq);

	error = request_threaded_irq(client->irq, NULL, tca8418_irq_handler,
				     IRQF_TRIGGER_FALLING |
				     IRQF_SHARED |
				     IRQF_ONESHOT,
				     client->name, keypad_data);
	if (error) {
		dev_dbg(dev, "Unable to claim irq %d; error %d\n",
			client->irq, error);
		goto fail2;
	}

	error = input_register_device(input);
	if (error) {
		dev_dbg(dev, "Unable to register input device, error: %d\n",
			error);
		goto fail3;
	}

	i2c_set_clientdata(client, keypad_data);
	return 0;

fail3:
	free_irq(client->irq, keypad_data);
fail2:
	input_free_device(input);
fail1:
	kfree(keypad_data);
	return error;
}

static int tca8418_keypad_remove(struct i2c_client *client)
{
	struct tca8418_keypad *keypad_data = i2c_get_clientdata(client);

	free_irq(keypad_data->client->irq, keypad_data);

	input_unregister_device(keypad_data->input);

	kfree(keypad_data);

	return 0;
}

static struct i2c_driver tca8418_keypad_driver = {
	.driver = {
		.name	= TCA8418_NAME,
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(tca8418_dt_ids),
	},
	.probe		= tca8418_keypad_probe,
	.remove		= tca8418_keypad_remove,
	.id_table	= tca8418_id,
};

static int __init tca8418_keypad_init(void)
{
	return i2c_add_driver(&tca8418_keypad_driver);
}
subsys_initcall(tca8418_keypad_init);

static void __exit tca8418_keypad_exit(void)
{
	i2c_del_driver(&tca8418_keypad_driver);
}
module_exit(tca8418_keypad_exit);

MODULE_AUTHOR("Kyle Manna <kyle.manna@fuel7.com>");
MODULE_DESCRIPTION("Keypad driver for TCA8418");
MODULE_LICENSE("GPL");
Commit	Line	Data
fb6c721b KM	1	/*
	2	* Driver for TCA8418 I2C keyboard
	3	*
	4	* Copyright (C) 2011 Fuel7, Inc. All rights reserved.
	5	*
	6	* Author: Kyle Manna <kyle.manna@fuel7.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public
	10	* License v2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public
	18	* License along with this program; if not, write to the
	19	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	20	* Boston, MA 021110-1307, USA.
	21	*
	22	* If you can't comply with GPLv2, alternative licensing terms may be
	23	* arranged. Please contact Fuel7, Inc. (http://fuel7.com/) for proprietary
	24	* alternative licensing inquiries.
	25	*/
	26
	27	#include <linux/types.h>
	28	#include <linux/module.h>
	29	#include <linux/init.h>
	30	#include <linux/delay.h>
	31	#include <linux/slab.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/workqueue.h>
	34	#include <linux/gpio.h>
	35	#include <linux/i2c.h>
	36	#include <linux/input.h>
	37	#include <linux/input/tca8418_keypad.h>
e89e29b8	38	#include <linux/of.h>
fb6c721b KM	39
	40	/* TCA8418 hardware limits */
	41	#define TCA8418_MAX_ROWS 8
	42	#define TCA8418_MAX_COLS 10
	43
	44	/* TCA8418 register offsets */
	45	#define REG_CFG 0x01
	46	#define REG_INT_STAT 0x02
	47	#define REG_KEY_LCK_EC 0x03
	48	#define REG_KEY_EVENT_A 0x04
	49	#define REG_KEY_EVENT_B 0x05
	50	#define REG_KEY_EVENT_C 0x06
	51	#define REG_KEY_EVENT_D 0x07
	52	#define REG_KEY_EVENT_E 0x08
	53	#define REG_KEY_EVENT_F 0x09
	54	#define REG_KEY_EVENT_G 0x0A
	55	#define REG_KEY_EVENT_H 0x0B
	56	#define REG_KEY_EVENT_I 0x0C
	57	#define REG_KEY_EVENT_J 0x0D
	58	#define REG_KP_LCK_TIMER 0x0E
	59	#define REG_UNLOCK1 0x0F
	60	#define REG_UNLOCK2 0x10
	61	#define REG_GPIO_INT_STAT1 0x11
	62	#define REG_GPIO_INT_STAT2 0x12
	63	#define REG_GPIO_INT_STAT3 0x13
	64	#define REG_GPIO_DAT_STAT1 0x14
	65	#define REG_GPIO_DAT_STAT2 0x15
	66	#define REG_GPIO_DAT_STAT3 0x16
	67	#define REG_GPIO_DAT_OUT1 0x17
	68	#define REG_GPIO_DAT_OUT2 0x18
	69	#define REG_GPIO_DAT_OUT3 0x19
	70	#define REG_GPIO_INT_EN1 0x1A
	71	#define REG_GPIO_INT_EN2 0x1B
	72	#define REG_GPIO_INT_EN3 0x1C
	73	#define REG_KP_GPIO1 0x1D
	74	#define REG_KP_GPIO2 0x1E
	75	#define REG_KP_GPIO3 0x1F
	76	#define REG_GPI_EM1 0x20
	77	#define REG_GPI_EM2 0x21
	78	#define REG_GPI_EM3 0x22
	79	#define REG_GPIO_DIR1 0x23
	80	#define REG_GPIO_DIR2 0x24
	81	#define REG_GPIO_DIR3 0x25
	82	#define REG_GPIO_INT_LVL1 0x26
	83	#define REG_GPIO_INT_LVL2 0x27
	84	#define REG_GPIO_INT_LVL3 0x28
	85	#define REG_DEBOUNCE_DIS1 0x29
	86	#define REG_DEBOUNCE_DIS2 0x2A
	87	#define REG_DEBOUNCE_DIS3 0x2B
	88	#define REG_GPIO_PULL1 0x2C
	89	#define REG_GPIO_PULL2 0x2D
	90	#define REG_GPIO_PULL3 0x2E
	91
	92	/* TCA8418 bit definitions */
	93	#define CFG_AI BIT(7)
	94	#define CFG_GPI_E_CFG BIT(6)
	95	#define CFG_OVR_FLOW_M BIT(5)
	96	#define CFG_INT_CFG BIT(4)
	97	#define CFG_OVR_FLOW_IEN BIT(3)
	98	#define CFG_K_LCK_IEN BIT(2)
	99	#define CFG_GPI_IEN BIT(1)
	100	#define CFG_KE_IEN BIT(0)
	101
	102	#define INT_STAT_CAD_INT BIT(4)
103	#define INT_STAT_OVR_FLOW_INT BIT(3)
104	#define INT_STAT_K_LCK_INT BIT(2)
105	#define INT_STAT_GPI_INT BIT(1)
106	#define INT_STAT_K_INT BIT(0)
107
108	/* TCA8418 register masks */
109	#define KEY_LCK_EC_KEC 0x7
110	#define KEY_EVENT_CODE 0x7f
111	#define KEY_EVENT_VALUE 0x80
112
113
114	static const struct i2c_device_id tca8418_id[] = {
115	{ TCA8418_NAME, 8418, },
116	{ }
117	};
118	MODULE_DEVICE_TABLE(i2c, tca8418_id);
119
e89e29b8 AB	120	#ifdef CONFIG_OF
	121	static const struct of_device_id tca8418_dt_ids[] __devinitconst = {
	122	{ .compatible = "ti,tca8418", },
	123	{ }
	124	};
	125	MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
	126	#endif
	127
fb6c721b	128	struct tca8418_keypad {
fb6c721b KM	129	unsigned int irq;
	130	unsigned int row_shift;
	131
	132	struct i2c_client *client;
	133	struct input_dev *input;
	134
	135	/* Flexible array member, must be at end of struct */
	136	unsigned short keymap[];
	137	};
	138
	139	/*
	140	* Write a byte to the TCA8418
	141	*/
	142	static int tca8418_write_byte(struct tca8418_keypad *keypad_data,
	143	int reg, u8 val)
	144	{
	145	int error;
	146
	147	error = i2c_smbus_write_byte_data(keypad_data->client, reg, val);
	148	if (error < 0) {
	149	dev_err(&keypad_data->client->dev,
	150	"%s failed, reg: %d, val: %d, error: %d\n",
	151	__func__, reg, val, error);
	152	return error;
	153	}
	154
	155	return 0;
	156	}
	157
	158	/*
	159	* Read a byte from the TCA8418
	160	*/
	161	static int tca8418_read_byte(struct tca8418_keypad *keypad_data,
	162	int reg, u8 *val)
	163	{
	164	int error;
	165
	166	error = i2c_smbus_read_byte_data(keypad_data->client, reg);
	167	if (error < 0) {
	168	dev_err(&keypad_data->client->dev,
	169	"%s failed, reg: %d, error: %d\n",
	170	__func__, reg, error);
	171	return error;
	172	}
	173
	174	*val = (u8)error;
	175
	176	return 0;
	177	}
	178
	179	static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
	180	{
	181	int error, col, row;
	182	u8 reg, state, code;
	183
	184	/* Initial read of the key event FIFO */
	185	error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);
	186
	187	/* Assume that key code 0 signifies empty FIFO */
	188	while (error >= 0 && reg > 0) {
	189	state = reg & KEY_EVENT_VALUE;
	190	code = reg & KEY_EVENT_CODE;
	191
	192	row = code / TCA8418_MAX_COLS;
193	col = code % TCA8418_MAX_COLS;
194
195	row = (col) ? row : row - 1;
196	col = (col) ? col - 1 : TCA8418_MAX_COLS - 1;
197
198	code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);
199	input_event(keypad_data->input, EV_MSC, MSC_SCAN, code);
200	input_report_key(keypad_data->input,
201	keypad_data->keymap[code], state);
202
203	/* Read for next loop */
204	error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);
205	}
206
207	if (error < 0)
208	dev_err(&keypad_data->client->dev,
209	"unable to read REG_KEY_EVENT_A\n");
210
211	input_sync(keypad_data->input);
212	}
213
214	/*
215	* Threaded IRQ handler and this can (and will) sleep.
216	*/
217	static irqreturn_t tca8418_irq_handler(int irq, void *dev_id)
218	{
219	struct tca8418_keypad *keypad_data = dev_id;
220	u8 reg;
221	int error;
222
223	error = tca8418_read_byte(keypad_data, REG_INT_STAT, &reg);
224	if (error) {
225	dev_err(&keypad_data->client->dev,
226	"unable to read REG_INT_STAT\n");
bf7f5316	227	return IRQ_NONE;
fb6c721b KM	228	}
fb6c721b KM	229
bf7f5316 AB	230	if (!reg)
	231	return IRQ_NONE;
	232
fb6c721b KM	233	if (reg & INT_STAT_OVR_FLOW_INT)
	234	dev_warn(&keypad_data->client->dev, "overflow occurred\n");
	235
	236	if (reg & INT_STAT_K_INT)
	237	tca8418_read_keypad(keypad_data);
	238
fb6c721b KM	239	/* Clear all interrupts, even IRQs we didn't check (GPI, CAD, LCK) */
	240	reg = 0xff;
	241	error = tca8418_write_byte(keypad_data, REG_INT_STAT, reg);
	242	if (error)
	243	dev_err(&keypad_data->client->dev,
	244	"unable to clear REG_INT_STAT\n");
	245
	246	return IRQ_HANDLED;
	247	}
	248
	249	/*
	250	* Configure the TCA8418 for keypad operation
	251	*/
e89e29b8 AB	252	static int tca8418_configure(struct tca8418_keypad *keypad_data,
e89e29b8 AB	253	u32 rows, u32 cols)
fb6c721b KM	254	{
	255	int reg, error;
	256
	257	/* Write config register, if this fails assume device not present */
	258	error = tca8418_write_byte(keypad_data, REG_CFG,
	259	CFG_INT_CFG \| CFG_OVR_FLOW_IEN \| CFG_KE_IEN);
	260	if (error < 0)
	261	return -ENODEV;
	262
	263
	264	/* Assemble a mask for row and column registers */
e89e29b8 AB	265	reg = ~(~0 << rows);
e89e29b8 AB	266	reg += (~(~0 << cols)) << 8;
fb6c721b KM	267
	268	/* Set registers to keypad mode */
	269	error \|= tca8418_write_byte(keypad_data, REG_KP_GPIO1, reg);
	270	error \|= tca8418_write_byte(keypad_data, REG_KP_GPIO2, reg >> 8);
	271	error \|= tca8418_write_byte(keypad_data, REG_KP_GPIO3, reg >> 16);
	272
	273	/* Enable column debouncing */
	274	error \|= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS1, reg);
	275	error \|= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS2, reg >> 8);
	276	error \|= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS3, reg >> 16);
	277
	278	return error;
	279	}
	280
5298cc4c	281	static int tca8418_keypad_probe(struct i2c_client *client,
fb6c721b KM	282	const struct i2c_device_id *id)
fb6c721b KM	283	{
efce8a41	284	struct device *dev = &client->dev;
fb6c721b	285	const struct tca8418_keypad_platform_data *pdata =
cdbe8a86	286	dev_get_platdata(dev);
fb6c721b KM	287	struct tca8418_keypad *keypad_data;
fb6c721b KM	288	struct input_dev *input;
e89e29b8 AB	289	const struct matrix_keymap_data *keymap_data = NULL;
	290	u32 rows = 0, cols = 0;
	291	bool rep = false;
	292	bool irq_is_gpio = false;
fb6c721b KM	293	int error, row_shift, max_keys;
	294
	295	/* Copy the platform data */
e89e29b8 AB	296	if (pdata) {
e89e29b8 AB	297	if (!pdata->keymap_data) {
efce8a41	298	dev_err(dev, "no keymap data defined\n");
e89e29b8 AB	299	return -EINVAL;
	300	}
	301	keymap_data = pdata->keymap_data;
	302	rows = pdata->rows;
	303	cols = pdata->cols;
	304	rep = pdata->rep;
	305	irq_is_gpio = pdata->irq_is_gpio;
	306	} else {
efce8a41	307	struct device_node *np = dev->of_node;
e89e29b8 AB	308	of_property_read_u32(np, "keypad,num-rows", &rows);
	309	of_property_read_u32(np, "keypad,num-columns", &cols);
	310	rep = of_property_read_bool(np, "keypad,autorepeat");
fb6c721b KM	311	}
fb6c721b KM	312
e89e29b8	313	if (!rows \|\| rows > TCA8418_MAX_ROWS) {
efce8a41	314	dev_err(dev, "invalid rows\n");
fb6c721b KM	315	return -EINVAL;
	316	}
	317
e89e29b8	318	if (!cols \|\| cols > TCA8418_MAX_COLS) {
efce8a41	319	dev_err(dev, "invalid columns\n");
fb6c721b KM	320	return -EINVAL;
	321	}
	322
	323	/* Check i2c driver capabilities */
	324	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
efce8a41	325	dev_err(dev, "%s adapter not supported\n",
fb6c721b KM	326	dev_driver_string(&client->adapter->dev));
	327	return -ENODEV;
	328	}
	329
e89e29b8 AB	330	row_shift = get_count_order(cols);
e89e29b8 AB	331	max_keys = rows << row_shift;
fb6c721b KM	332
	333	/* Allocate memory for keypad_data, keymap and input device */
	334	keypad_data = kzalloc(sizeof(*keypad_data) +
	335	max_keys * sizeof(keypad_data->keymap[0]), GFP_KERNEL);
	336	if (!keypad_data)
	337	return -ENOMEM;
	338
fb6c721b KM	339	keypad_data->client = client;
	340	keypad_data->row_shift = row_shift;
	341
	342	/* Initialize the chip or fail if chip isn't present */
e89e29b8	343	error = tca8418_configure(keypad_data, rows, cols);
fb6c721b KM	344	if (error < 0)
	345	goto fail1;
	346
	347	/* Configure input device */
	348	input = input_allocate_device();
	349	if (!input) {
	350	error = -ENOMEM;
	351	goto fail1;
	352	}
	353	keypad_data->input = input;
	354
	355	input->name = client->name;
	356	input->dev.parent = &client->dev;
	357
	358	input->id.bustype = BUS_I2C;
	359	input->id.vendor = 0x0001;
	360	input->id.product = 0x001;
	361	input->id.version = 0x0001;
	362
e89e29b8	363	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
1932811f DT	364	keypad_data->keymap, input);
1932811f DT	365	if (error) {
efce8a41	366	dev_dbg(dev, "Failed to build keymap\n");
1932811f DT	367	goto fail2;
1932811f DT	368	}
fb6c721b	369
e89e29b8	370	if (rep)
fb6c721b	371	__set_bit(EV_REP, input->evbit);
fb6c721b KM	372	input_set_capability(input, EV_MSC, MSC_SCAN);
	373
	374	input_set_drvdata(input, keypad_data);
	375
e89e29b8	376	if (irq_is_gpio)
fb6c721b KM	377	client->irq = gpio_to_irq(client->irq);
	378
	379	error = request_threaded_irq(client->irq, NULL, tca8418_irq_handler,
bf7f5316 AB	380	IRQF_TRIGGER_FALLING \|
	381	IRQF_SHARED \|
	382	IRQF_ONESHOT,
fb6c721b KM	383	client->name, keypad_data);
fb6c721b KM	384	if (error) {
efce8a41	385	dev_dbg(dev, "Unable to claim irq %d; error %d\n",
fb6c721b KM	386	client->irq, error);
	387	goto fail2;
	388	}
	389
	390	error = input_register_device(input);
	391	if (error) {
efce8a41 DT	392	dev_dbg(dev, "Unable to register input device, error: %d\n",
efce8a41 DT	393	error);
fb6c721b KM	394	goto fail3;
	395	}
	396
	397	i2c_set_clientdata(client, keypad_data);
	398	return 0;
	399
	400	fail3:
	401	free_irq(client->irq, keypad_data);
	402	fail2:
	403	input_free_device(input);
	404	fail1:
	405	kfree(keypad_data);
	406	return error;
	407	}
	408
e2619cf7	409	static int tca8418_keypad_remove(struct i2c_client *client)
fb6c721b KM	410	{
	411	struct tca8418_keypad *keypad_data = i2c_get_clientdata(client);
	412
	413	free_irq(keypad_data->client->irq, keypad_data);
	414
	415	input_unregister_device(keypad_data->input);
	416
	417	kfree(keypad_data);
	418
	419	return 0;
	420	}
	421
fb6c721b KM	422	static struct i2c_driver tca8418_keypad_driver = {
	423	.driver = {
	424	.name = TCA8418_NAME,
	425	.owner = THIS_MODULE,
e89e29b8	426	.of_match_table = of_match_ptr(tca8418_dt_ids),
fb6c721b KM	427	},
fb6c721b KM	428	.probe = tca8418_keypad_probe,
1cb0aa88	429	.remove = tca8418_keypad_remove,
fb6c721b KM	430	.id_table = tca8418_id,
	431	};
	432
	433	static int __init tca8418_keypad_init(void)
	434	{
	435	return i2c_add_driver(&tca8418_keypad_driver);
	436	}
	437	subsys_initcall(tca8418_keypad_init);
	438
	439	static void __exit tca8418_keypad_exit(void)
	440	{
	441	i2c_del_driver(&tca8418_keypad_driver);
	442	}
	443	module_exit(tca8418_keypad_exit);
	444
	445	MODULE_AUTHOR("Kyle Manna <kyle.manna@fuel7.com>");
	446	MODULE_DESCRIPTION("Keypad driver for TCA8418");
	447	MODULE_LICENSE("GPL");