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Commit 38e783b3 authored by Joonyoung Shim's avatar Joonyoung Shim Committed by Dmitry Torokhov
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Input: add touchscreen driver for MELFAS MCS-5000 controller 

The MELPAS MCS-5000 is the touchscreen controller. The overview of this
controller can see at the following website:

http://www.melfas.com/product/product01.asp?k_r=eng_



This driver is tested on s3c6410 NCP board and supports only the i2c
interface.

Signed-off-by: default avatarJoonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 422b552d

drivers/input/touchscreen/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -169,6 +169,17 @@ config TOUCHSCREEN_WACOM_W8001 
	  To compile this driver as a module, choose M here: the

	  module will be called wacom_w8001.



config TOUCHSCREEN_MCS5000

	tristate "MELFAS MCS-5000 touchscreen"

	depends on I2C

	help

	  Say Y here if you have the MELFAS MCS-5000 touchscreen controller

	  chip in your system.



	  If unsure, say N.



	  To compile this driver as a module, choose M here: the

	  module will be called mcs5000_ts.



config TOUCHSCREEN_MTOUCH

	tristate "MicroTouch serial touchscreens"

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o 
obj-$(CONFIG_TOUCHSCREEN_ELO)		+= elo.o

obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o

obj-$(CONFIG_TOUCHSCREEN_INEXIO)	+= inexio.o

obj-$(CONFIG_TOUCHSCREEN_MCS5000)	+= mcs5000_ts.o

obj-$(CONFIG_TOUCHSCREEN_MIGOR)		+= migor_ts.o

obj-$(CONFIG_TOUCHSCREEN_MTOUCH)	+= mtouch.o

obj-$(CONFIG_TOUCHSCREEN_MK712)		+= mk712.o

drivers/input/touchscreen/mcs5000_ts.c

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/*

 * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller

 *

 * Copyright (C) 2009 Samsung Electronics Co.Ltd

 * Author: Joonyoung Shim <jy0922.shim@samsung.com>

 *

 * Based on wm97xx-core.c

 *

 *  This program is free software; you can redistribute  it and/or modify it

 *  under  the terms of  the GNU General  Public License as published by the

 *  Free Software Foundation;  either version 2 of the  License, or (at your

 *  option) any later version.

 *

 */



#include <linux/module.h>

#include <linux/init.h>

#include <linux/i2c.h>

#include <linux/i2c/mcs5000_ts.h>

#include <linux/interrupt.h>

#include <linux/input.h>

#include <linux/irq.h>



/* Registers */

#define MCS5000_TS_STATUS		0x00

#define STATUS_OFFSET			0

#define STATUS_NO			(0 << STATUS_OFFSET)

#define STATUS_INIT			(1 << STATUS_OFFSET)

#define STATUS_SENSING			(2 << STATUS_OFFSET)

#define STATUS_COORD			(3 << STATUS_OFFSET)

#define STATUS_GESTURE			(4 << STATUS_OFFSET)

#define ERROR_OFFSET			4

#define ERROR_NO			(0 << ERROR_OFFSET)

#define ERROR_POWER_ON_RESET		(1 << ERROR_OFFSET)

#define ERROR_INT_RESET			(2 << ERROR_OFFSET)

#define ERROR_EXT_RESET			(3 << ERROR_OFFSET)

#define ERROR_INVALID_REG_ADDRESS	(8 << ERROR_OFFSET)

#define ERROR_INVALID_REG_VALUE		(9 << ERROR_OFFSET)



#define MCS5000_TS_OP_MODE		0x01

#define RESET_OFFSET			0

#define RESET_NO			(0 << RESET_OFFSET)

#define RESET_EXT_SOFT			(1 << RESET_OFFSET)

#define OP_MODE_OFFSET			1

#define OP_MODE_SLEEP			(0 << OP_MODE_OFFSET)

#define OP_MODE_ACTIVE			(1 << OP_MODE_OFFSET)

#define GESTURE_OFFSET			4

#define GESTURE_DISABLE			(0 << GESTURE_OFFSET)

#define GESTURE_ENABLE			(1 << GESTURE_OFFSET)

#define PROXIMITY_OFFSET		5

#define PROXIMITY_DISABLE		(0 << PROXIMITY_OFFSET)

#define PROXIMITY_ENABLE		(1 << PROXIMITY_OFFSET)

#define SCAN_MODE_OFFSET		6

#define SCAN_MODE_INTERRUPT		(0 << SCAN_MODE_OFFSET)

#define SCAN_MODE_POLLING		(1 << SCAN_MODE_OFFSET)

#define REPORT_RATE_OFFSET		7

#define REPORT_RATE_40			(0 << REPORT_RATE_OFFSET)

#define REPORT_RATE_80			(1 << REPORT_RATE_OFFSET)



#define MCS5000_TS_SENS_CTL		0x02

#define MCS5000_TS_FILTER_CTL		0x03

#define PRI_FILTER_OFFSET		0

#define SEC_FILTER_OFFSET		4



#define MCS5000_TS_X_SIZE_UPPER		0x08

#define MCS5000_TS_X_SIZE_LOWER		0x09

#define MCS5000_TS_Y_SIZE_UPPER		0x0A

#define MCS5000_TS_Y_SIZE_LOWER		0x0B



#define MCS5000_TS_INPUT_INFO		0x10

#define INPUT_TYPE_OFFSET		0

#define INPUT_TYPE_NONTOUCH		(0 << INPUT_TYPE_OFFSET)

#define INPUT_TYPE_SINGLE		(1 << INPUT_TYPE_OFFSET)

#define INPUT_TYPE_DUAL			(2 << INPUT_TYPE_OFFSET)

#define INPUT_TYPE_PALM			(3 << INPUT_TYPE_OFFSET)

#define INPUT_TYPE_PROXIMITY		(7 << INPUT_TYPE_OFFSET)

#define GESTURE_CODE_OFFSET		3

#define GESTURE_CODE_NO			(0 << GESTURE_CODE_OFFSET)



#define MCS5000_TS_X_POS_UPPER		0x11

#define MCS5000_TS_X_POS_LOWER		0x12

#define MCS5000_TS_Y_POS_UPPER		0x13

#define MCS5000_TS_Y_POS_LOWER		0x14

#define MCS5000_TS_Z_POS		0x15

#define MCS5000_TS_WIDTH		0x16

#define MCS5000_TS_GESTURE_VAL		0x17

#define MCS5000_TS_MODULE_REV		0x20

#define MCS5000_TS_FIRMWARE_VER		0x21



/* Touchscreen absolute values */

#define MCS5000_MAX_XC			0x3ff

#define MCS5000_MAX_YC			0x3ff



enum mcs5000_ts_read_offset {

	READ_INPUT_INFO,

	READ_X_POS_UPPER,

	READ_X_POS_LOWER,

	READ_Y_POS_UPPER,

	READ_Y_POS_LOWER,

	READ_BLOCK_SIZE,

};



/* Each client has this additional data */

struct mcs5000_ts_data {

	struct i2c_client *client;

	struct input_dev *input_dev;

	const struct mcs5000_ts_platform_data *platform_data;

};



static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)

{

	struct mcs5000_ts_data *data = dev_id;

	struct i2c_client *client = data->client;

	u8 buffer[READ_BLOCK_SIZE];

	int err;

	int x;

	int y;



	err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,

			READ_BLOCK_SIZE, buffer);

	if (err < 0) {

		dev_err(&client->dev, "%s, err[%d]\n", __func__, err);

		goto out;

	}



	switch (buffer[READ_INPUT_INFO]) {

	case INPUT_TYPE_NONTOUCH:

		input_report_key(data->input_dev, BTN_TOUCH, 0);

		input_sync(data->input_dev);

		break;



	case INPUT_TYPE_SINGLE:

		x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER];

		y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER];



		input_report_key(data->input_dev, BTN_TOUCH, 1);

		input_report_abs(data->input_dev, ABS_X, x);

		input_report_abs(data->input_dev, ABS_Y, y);

		input_sync(data->input_dev);

		break;



	case INPUT_TYPE_DUAL:

		/* TODO */

		break;



	case INPUT_TYPE_PALM:

		/* TODO */

		break;



	case INPUT_TYPE_PROXIMITY:

		/* TODO */

		break;



	default:

		dev_err(&client->dev, "Unknown ts input type %d\n",

				buffer[READ_INPUT_INFO]);

		break;

	}



 out:

	return IRQ_HANDLED;

}



static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)

{

	const struct mcs5000_ts_platform_data *platform_data =

		data->platform_data;

	struct i2c_client *client = data->client;



	/* Touch reset & sleep mode */

	i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,

			RESET_EXT_SOFT | OP_MODE_SLEEP);



	/* Touch size */

	i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER,

			platform_data->x_size >> 8);

	i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER,

			platform_data->x_size & 0xff);

	i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER,

			platform_data->y_size >> 8);

	i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER,

			platform_data->y_size & 0xff);



	/* Touch active mode & 80 report rate */

	i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,

			OP_MODE_ACTIVE | REPORT_RATE_80);

}



static int __devinit mcs5000_ts_probe(struct i2c_client *client,

		const struct i2c_device_id *id)

{

	struct mcs5000_ts_data *data;

	struct input_dev *input_dev;

	int ret;



	if (!client->dev.platform_data)

		return -EINVAL;



	data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);

	input_dev = input_allocate_device();

	if (!data || !input_dev) {

		dev_err(&client->dev, "Failed to allocate memory\n");

		ret = -ENOMEM;

		goto err_free_mem;

	}



	data->client = client;

	data->input_dev = input_dev;

	data->platform_data = client->dev.platform_data;



	input_dev->name = "MELPAS MCS-5000 Touchscreen";

	input_dev->id.bustype = BUS_I2C;

	input_dev->dev.parent = &client->dev;



	__set_bit(EV_ABS, input_dev->evbit);

	__set_bit(EV_KEY, input_dev->evbit);

	__set_bit(BTN_TOUCH, input_dev->keybit);

	input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0);

	input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);



	input_set_drvdata(input_dev, data);



	if (data->platform_data->cfg_pin)

		data->platform_data->cfg_pin();



	ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,

			IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);



	if (ret < 0) {

		dev_err(&client->dev, "Failed to register interrupt\n");

		goto err_free_mem;

	}



	ret = input_register_device(data->input_dev);

	if (ret < 0)

		goto err_free_irq;



	mcs5000_ts_phys_init(data);

	i2c_set_clientdata(client, data);



	return 0;



err_free_irq:

	free_irq(client->irq, data);

err_free_mem:

	input_free_device(input_dev);

	kfree(data);

	return ret;

}



static int __devexit mcs5000_ts_remove(struct i2c_client *client)

{

	struct mcs5000_ts_data *data = i2c_get_clientdata(client);



	free_irq(client->irq, data);

	input_unregister_device(data->input_dev);

	kfree(data);

	i2c_set_clientdata(client, NULL);



	return 0;

}



#ifdef CONFIG_PM

static int mcs5000_ts_suspend(struct i2c_client *client, pm_message_t mesg)

{

	/* Touch sleep mode */

	i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);



	return 0;

}



static int mcs5000_ts_resume(struct i2c_client *client)

{

	struct mcs5000_ts_data *data = i2c_get_clientdata(client);



	mcs5000_ts_phys_init(data);



	return 0;

}

#else

#define mcs5000_ts_suspend	NULL

#define mcs5000_ts_resume	NULL

#endif



static const struct i2c_device_id mcs5000_ts_id[] = {

	{ "mcs5000_ts", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);



static struct i2c_driver mcs5000_ts_driver = {

	.probe		= mcs5000_ts_probe,

	.remove		= __devexit_p(mcs5000_ts_remove),

	.suspend	= mcs5000_ts_suspend,

	.resume		= mcs5000_ts_resume,

	.driver = {

		.name = "mcs5000_ts",

	},

	.id_table	= mcs5000_ts_id,

};



static int __init mcs5000_ts_init(void)

{

	return i2c_add_driver(&mcs5000_ts_driver);

}



static void __exit mcs5000_ts_exit(void)

{

	i2c_del_driver(&mcs5000_ts_driver);

}



module_init(mcs5000_ts_init);

module_exit(mcs5000_ts_exit);



/* Module information */

MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");

MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");

MODULE_LICENSE("GPL");

include/linux/i2c/mcs5000_ts.h

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/*

 * mcs5000_ts.h

 *

 * Copyright (C) 2009 Samsung Electronics Co.Ltd

 * Author: Joonyoung Shim <jy0922.shim@samsung.com>

 *

 *  This program is free software; you can redistribute  it and/or modify it

 *  under  the terms of  the GNU General  Public License as published by the

 *  Free Software Foundation;  either version 2 of the  License, or (at your

 *  option) any later version.

 *

 */



#ifndef __LINUX_MCS5000_TS_H

#define __LINUX_MCS5000_TS_H



/* platform data for the MELFAS MCS-5000 touchscreen driver */

struct mcs5000_ts_platform_data {

	void (*cfg_pin)(void);

	int x_size;

	int y_size;

};



#endif	/* __LINUX_MCS5000_TS_H */