drivers/input/touchscreen/sx8654.c - kernel/bruno - Git at Google

 /*
  * Driver for Semtech SX8654 I2C touchscreen controller.
  *
  * Copyright (c) 2015 Armadeus Systems
  *	Sébastien Szymanski <sebastien.szymanski@armadeus.com>
  *
  * Using code from:
  *  - sx865x.c
  *	Copyright (c) 2013 U-MoBo Srl
  *	Pierluigi Passaro <p.passaro@u-mobo.com>
  *  - sx8650.c
  *      Copyright (c) 2009 Wayne Roberts
  *  - tsc2007.c
  *      Copyright (c) 2008 Kwangwoo Lee
  *  - ads7846.c
  *      Copyright (c) 2005 David Brownell
  *      Copyright (c) 2006 Nokia Corporation
  *  - corgi_ts.c
  *      Copyright (C) 2004-2005 Richard Purdie
  *  - omap_ts.[hc], ads7846.h, ts_osk.c
  *      Copyright (C) 2002 MontaVista Software
  *      Copyright (C) 2004 Texas Instruments
  *      Copyright (C) 2005 Dirk Behme
  *
  *  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/input.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>

 /* register addresses */
 #define I2C_REG_TOUCH0			0x00
 #define I2C_REG_TOUCH1			0x01
 #define I2C_REG_CHANMASK		0x04
 #define I2C_REG_IRQMASK			0x22
 #define I2C_REG_IRQSRC			0x23
 #define I2C_REG_SOFTRESET		0x3f

 /* commands */
 #define CMD_READ_REGISTER		0x40
 #define CMD_MANUAL			0xc0
 #define CMD_PENTRG			0xe0

 /* value for I2C_REG_SOFTRESET */
 #define SOFTRESET_VALUE			0xde

 /* bits for I2C_REG_IRQSRC */
 #define IRQ_PENTOUCH_TOUCHCONVDONE	0x08
 #define IRQ_PENRELEASE			0x04

 /* bits for RegTouch1 */
 #define CONDIRQ				0x20
 #define FILT_7SA			0x03

 /* bits for I2C_REG_CHANMASK */
 #define CONV_X				0x80
 #define CONV_Y				0x40

 /* coordinates rate: higher nibble of CTRL0 register */
 #define RATE_MANUAL			0x00
 #define RATE_5000CPS			0xf0

 /* power delay: lower nibble of CTRL0 register */
 #define POWDLY_1_1MS			0x0b

 #define MAX_12BIT			((1 << 12) - 1)

 struct sx8654 {
 	struct input_dev *input;
 	struct i2c_client *client;
 };

 static irqreturn_t sx8654_irq(int irq, void *handle)
 {
 	struct sx8654 *sx8654 = handle;
 	int irqsrc;
 	u8 data[4];
 	unsigned int x, y;
 	int retval;

 	irqsrc = i2c_smbus_read_byte_data(sx8654->client,
 					  CMD_READ_REGISTER | I2C_REG_IRQSRC);
 	dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);

 	if (irqsrc < 0)
 		goto out;

 	if (irqsrc & IRQ_PENRELEASE) {
 		dev_dbg(&sx8654->client->dev, "pen release interrupt");

 		input_report_key(sx8654->input, BTN_TOUCH, 0);
 		input_sync(sx8654->input);
 	}

 	if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
 		dev_dbg(&sx8654->client->dev, "pen touch interrupt");

 		retval = i2c_master_recv(sx8654->client, data, sizeof(data));
 		if (retval != sizeof(data))
 			goto out;

 		/* invalid data */
 		if (unlikely(data[0] & 0x80 || data[2] & 0x80))
 			goto out;

 		x = ((data[0] & 0xf) << 8) | (data[1]);
 		y = ((data[2] & 0xf) << 8) | (data[3]);

 		input_report_abs(sx8654->input, ABS_X, x);
 		input_report_abs(sx8654->input, ABS_Y, y);
 		input_report_key(sx8654->input, BTN_TOUCH, 1);
 		input_sync(sx8654->input);

 		dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
 	}

 out:
 	return IRQ_HANDLED;
 }

 static int sx8654_open(struct input_dev *dev)
 {
 	struct sx8654 *sx8654 = input_get_drvdata(dev);
 	struct i2c_client *client = sx8654->client;
 	int error;

 	/* enable pen trigger mode */
 	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
 					  RATE_5000CPS | POWDLY_1_1MS);
 	if (error) {
 		dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
 		return error;
 	}

 	error = i2c_smbus_write_byte(client, CMD_PENTRG);
 	if (error) {
 		dev_err(&client->dev, "writing command CMD_PENTRG failed");
 		return error;
 	}

 	enable_irq(client->irq);

 	return 0;
 }

 static void sx8654_close(struct input_dev *dev)
 {
 	struct sx8654 *sx8654 = input_get_drvdata(dev);
 	struct i2c_client *client = sx8654->client;
 	int error;

 	disable_irq(client->irq);

 	/* enable manual mode mode */
 	error = i2c_smbus_write_byte(client, CMD_MANUAL);
 	if (error) {
 		dev_err(&client->dev, "writing command CMD_MANUAL failed");
 		return;
 	}

 	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
 	if (error) {
 		dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
 		return;
 	}
 }

 static int sx8654_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct sx8654 *sx8654;
 	struct input_dev *input;
 	int error;

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_READ_WORD_DATA))
 		return -ENXIO;

 	sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
 	if (!sx8654)
 		return -ENOMEM;

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

 	input->name = "SX8654 I2C Touchscreen";
 	input->id.bustype = BUS_I2C;
 	input->dev.parent = &client->dev;
 	input->open = sx8654_open;
 	input->close = sx8654_close;

 	__set_bit(INPUT_PROP_DIRECT, input->propbit);
 	input_set_capability(input, EV_KEY, BTN_TOUCH);
 	input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
 	input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);

 	sx8654->client = client;
 	sx8654->input = input;

 	input_set_drvdata(sx8654->input, sx8654);

 	error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
 					  SOFTRESET_VALUE);
 	if (error) {
 		dev_err(&client->dev, "writing softreset value failed");
 		return error;
 	}

 	error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
 					  CONV_X | CONV_Y);
 	if (error) {
 		dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
 		return error;
 	}

 	error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
 					  IRQ_PENTOUCH_TOUCHCONVDONE |
 						IRQ_PENRELEASE);
 	if (error) {
 		dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
 		return error;
 	}

 	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
 					  CONDIRQ | FILT_7SA);
 	if (error) {
 		dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
 		return error;
 	}

 	error = devm_request_threaded_irq(&client->dev, client->irq,
 					  NULL, sx8654_irq,
 					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 					  client->name, sx8654);
 	if (error) {
 		dev_err(&client->dev,
 			"Failed to enable IRQ %d, error: %d\n",
 			client->irq, error);
 		return error;
 	}

 	/* Disable the IRQ, we'll enable it in sx8654_open() */
 	disable_irq(client->irq);

 	error = input_register_device(sx8654->input);
 	if (error)
 		return error;

 	i2c_set_clientdata(client, sx8654);
 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id sx8654_of_match[] = {
 	{ .compatible = "semtech,sx8654", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, sx8654_of_match);
 #endif

 static const struct i2c_device_id sx8654_id_table[] = {
 	{ "semtech_sx8654", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, sx8654_id_table);

 static struct i2c_driver sx8654_driver = {
 	.driver = {
 		.name = "sx8654",
 		.of_match_table = of_match_ptr(sx8654_of_match),
 	},
 	.id_table = sx8654_id_table,
 	.probe = sx8654_probe,
 };
 module_i2c_driver(sx8654_driver);

 MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
 MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
 MODULE_LICENSE("GPL");
	/*
	* Driver for Semtech SX8654 I2C touchscreen controller.
	*
	* Copyright (c) 2015 Armadeus Systems
	* Sébastien Szymanski <sebastien.szymanski@armadeus.com>
	*
	* Using code from:
	* - sx865x.c
	* Copyright (c) 2013 U-MoBo Srl
	* Pierluigi Passaro <p.passaro@u-mobo.com>
	* - sx8650.c
	* Copyright (c) 2009 Wayne Roberts
	* - tsc2007.c
	* Copyright (c) 2008 Kwangwoo Lee
	* - ads7846.c
	* Copyright (c) 2005 David Brownell
	* Copyright (c) 2006 Nokia Corporation
	* - corgi_ts.c
	* Copyright (C) 2004-2005 Richard Purdie
	* - omap_ts.[hc], ads7846.h, ts_osk.c
	* Copyright (C) 2002 MontaVista Software
	* Copyright (C) 2004 Texas Instruments
	* Copyright (C) 2005 Dirk Behme
	*
	* 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/input.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>

	/* register addresses */
	#define I2C_REG_TOUCH0 0x00
	#define I2C_REG_TOUCH1 0x01
	#define I2C_REG_CHANMASK 0x04
	#define I2C_REG_IRQMASK 0x22
	#define I2C_REG_IRQSRC 0x23
	#define I2C_REG_SOFTRESET 0x3f

	/* commands */
	#define CMD_READ_REGISTER 0x40
	#define CMD_MANUAL 0xc0
	#define CMD_PENTRG 0xe0

	/* value for I2C_REG_SOFTRESET */
	#define SOFTRESET_VALUE 0xde

	/* bits for I2C_REG_IRQSRC */
	#define IRQ_PENTOUCH_TOUCHCONVDONE 0x08
	#define IRQ_PENRELEASE 0x04

	/* bits for RegTouch1 */
	#define CONDIRQ 0x20
	#define FILT_7SA 0x03

	/* bits for I2C_REG_CHANMASK */
	#define CONV_X 0x80
	#define CONV_Y 0x40

	/* coordinates rate: higher nibble of CTRL0 register */
	#define RATE_MANUAL 0x00
	#define RATE_5000CPS 0xf0

	/* power delay: lower nibble of CTRL0 register */
	#define POWDLY_1_1MS 0x0b

	#define MAX_12BIT ((1 << 12) - 1)

	struct sx8654 {
	struct input_dev *input;
	struct i2c_client *client;
	};

	static irqreturn_t sx8654_irq(int irq, void *handle)
	{
	struct sx8654 *sx8654 = handle;
	int irqsrc;
	u8 data[4];
	unsigned int x, y;
	int retval;

	irqsrc = i2c_smbus_read_byte_data(sx8654->client,
	CMD_READ_REGISTER \| I2C_REG_IRQSRC);
	dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);

	if (irqsrc < 0)
	goto out;

	if (irqsrc & IRQ_PENRELEASE) {
	dev_dbg(&sx8654->client->dev, "pen release interrupt");

	input_report_key(sx8654->input, BTN_TOUCH, 0);
	input_sync(sx8654->input);
	}

	if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
	dev_dbg(&sx8654->client->dev, "pen touch interrupt");

	retval = i2c_master_recv(sx8654->client, data, sizeof(data));
	if (retval != sizeof(data))
	goto out;

	/* invalid data */
	if (unlikely(data[0] & 0x80 \|\| data[2] & 0x80))
	goto out;

	x = ((data[0] & 0xf) << 8) \| (data[1]);
	y = ((data[2] & 0xf) << 8) \| (data[3]);

	input_report_abs(sx8654->input, ABS_X, x);
	input_report_abs(sx8654->input, ABS_Y, y);
	input_report_key(sx8654->input, BTN_TOUCH, 1);
	input_sync(sx8654->input);

	dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
	}

	out:
	return IRQ_HANDLED;
	}

	static int sx8654_open(struct input_dev *dev)
	{
	struct sx8654 *sx8654 = input_get_drvdata(dev);
	struct i2c_client *client = sx8654->client;
	int error;

	/* enable pen trigger mode */
	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
	RATE_5000CPS \| POWDLY_1_1MS);
	if (error) {
	dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
	return error;
	}

	error = i2c_smbus_write_byte(client, CMD_PENTRG);
	if (error) {
	dev_err(&client->dev, "writing command CMD_PENTRG failed");
	return error;
	}

	enable_irq(client->irq);

	return 0;
	}

	static void sx8654_close(struct input_dev *dev)
	{
	struct sx8654 *sx8654 = input_get_drvdata(dev);
	struct i2c_client *client = sx8654->client;
	int error;

	disable_irq(client->irq);

	/* enable manual mode mode */
	error = i2c_smbus_write_byte(client, CMD_MANUAL);
	if (error) {
	dev_err(&client->dev, "writing command CMD_MANUAL failed");
	return;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
	if (error) {
	dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
	return;
	}
	}

	static int sx8654_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct sx8654 *sx8654;
	struct input_dev *input;
	int error;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_READ_WORD_DATA))
	return -ENXIO;

	sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
	if (!sx8654)
	return -ENOMEM;

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

	input->name = "SX8654 I2C Touchscreen";
	input->id.bustype = BUS_I2C;
	input->dev.parent = &client->dev;
	input->open = sx8654_open;
	input->close = sx8654_close;

	__set_bit(INPUT_PROP_DIRECT, input->propbit);
	input_set_capability(input, EV_KEY, BTN_TOUCH);
	input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
	input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);

	sx8654->client = client;
	sx8654->input = input;

	input_set_drvdata(sx8654->input, sx8654);

	error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
	SOFTRESET_VALUE);
	if (error) {
	dev_err(&client->dev, "writing softreset value failed");
	return error;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
	CONV_X \| CONV_Y);
	if (error) {
	dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
	return error;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
	IRQ_PENTOUCH_TOUCHCONVDONE \|
	IRQ_PENRELEASE);
	if (error) {
	dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
	return error;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
	CONDIRQ \| FILT_7SA);
	if (error) {
	dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
	return error;
	}

	error = devm_request_threaded_irq(&client->dev, client->irq,
	NULL, sx8654_irq,
	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	client->name, sx8654);
	if (error) {
	dev_err(&client->dev,
	"Failed to enable IRQ %d, error: %d\n",
	client->irq, error);
	return error;
	}

	/* Disable the IRQ, we'll enable it in sx8654_open() */
	disable_irq(client->irq);

	error = input_register_device(sx8654->input);
	if (error)
	return error;

	i2c_set_clientdata(client, sx8654);
	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id sx8654_of_match[] = {
	{ .compatible = "semtech,sx8654", },
	{ },
	};
	MODULE_DEVICE_TABLE(of, sx8654_of_match);
	#endif

	static const struct i2c_device_id sx8654_id_table[] = {
	{ "semtech_sx8654", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(i2c, sx8654_id_table);

	static struct i2c_driver sx8654_driver = {
	.driver = {
	.name = "sx8654",
	.of_match_table = of_match_ptr(sx8654_of_match),
	},
	.id_table = sx8654_id_table,
	.probe = sx8654_probe,
	};
	module_i2c_driver(sx8654_driver);

	MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
	MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
	MODULE_LICENSE("GPL");