drivers/input/touchscreen/st1232.c - arm/linux - Git at Google

 /*
  * ST1232 Touchscreen Controller Driver
  *
  * Copyright (C) 2010 Renesas Solutions Corp.
  *	Tony SIM <chinyeow.sim.xt@renesas.com>
  *
  * Using code from:
  *  - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
  *	Copyright (C) 2007 Google, Inc.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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.
  */

 #include <linux/delay.h>
 #include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/pm_qos.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/platform_data/st1232_pdata.h>

 #define ST1232_TS_NAME	"st1232-ts"

 #define MIN_X		0x00
 #define MIN_Y		0x00
 #define MAX_X		0x31f	/* (800 - 1) */
 #define MAX_Y		0x1df	/* (480 - 1) */
 #define MAX_AREA	0xff
 #define MAX_FINGERS	2

 struct st1232_ts_finger {
 	u16 x;
 	u16 y;
 	u8 t;
 	bool is_valid;
 };

 struct st1232_ts_data {
 	struct i2c_client *client;
 	struct input_dev *input_dev;
 	struct st1232_ts_finger finger[MAX_FINGERS];
 	struct dev_pm_qos_request low_latency_req;
 	int reset_gpio;
 };

 static int st1232_ts_read_data(struct st1232_ts_data *ts)
 {
 	struct st1232_ts_finger *finger = ts->finger;
 	struct i2c_client *client = ts->client;
 	struct i2c_msg msg[2];
 	int error;
 	u8 start_reg;
 	u8 buf[10];

 	/* read touchscreen data from ST1232 */
 	msg[0].addr = client->addr;
 	msg[0].flags = 0;
 	msg[0].len = 1;
 	msg[0].buf = &start_reg;
 	start_reg = 0x10;

 	msg[1].addr = ts->client->addr;
 	msg[1].flags = I2C_M_RD;
 	msg[1].len = sizeof(buf);
 	msg[1].buf = buf;

 	error = i2c_transfer(client->adapter, msg, 2);
 	if (error < 0)
 		return error;

 	/* get "valid" bits */
 	finger[0].is_valid = buf[2] >> 7;
 	finger[1].is_valid = buf[5] >> 7;

 	/* get xy coordinate */
 	if (finger[0].is_valid) {
 		finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
 		finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
 		finger[0].t = buf[8];
 	}

 	if (finger[1].is_valid) {
 		finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
 		finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
 		finger[1].t = buf[9];
 	}

 	return 0;
 }

 static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
 {
 	struct st1232_ts_data *ts = dev_id;
 	struct st1232_ts_finger *finger = ts->finger;
 	struct input_dev *input_dev = ts->input_dev;
 	int count = 0;
 	int i, ret;

 	ret = st1232_ts_read_data(ts);
 	if (ret < 0)
 		goto end;

 	/* multi touch protocol */
 	for (i = 0; i < MAX_FINGERS; i++) {
 		if (!finger[i].is_valid)
 			continue;

 		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
 		input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
 		input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
 		input_mt_sync(input_dev);
 		count++;
 	}

 	/* SYN_MT_REPORT only if no contact */
 	if (!count) {
 		input_mt_sync(input_dev);
 		if (ts->low_latency_req.dev) {
 			dev_pm_qos_remove_request(&ts->low_latency_req);
 			ts->low_latency_req.dev = NULL;
 		}
 	} else if (!ts->low_latency_req.dev) {
 		/* First contact, request 100 us latency. */
 		dev_pm_qos_add_ancestor_request(&ts->client->dev,
 						&ts->low_latency_req,
 						DEV_PM_QOS_RESUME_LATENCY, 100);
 	}

 	/* SYN_REPORT */
 	input_sync(input_dev);

 end:
 	return IRQ_HANDLED;
 }

 static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
 {
 	if (gpio_is_valid(ts->reset_gpio))
 		gpio_direction_output(ts->reset_gpio, poweron);
 }

 static int st1232_ts_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
 	struct st1232_ts_data *ts;
 	struct st1232_pdata *pdata = dev_get_platdata(&client->dev);
 	struct input_dev *input_dev;
 	int error;

 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "need I2C_FUNC_I2C\n");
 		return -EIO;
 	}

 	if (!client->irq) {
 		dev_err(&client->dev, "no IRQ?\n");
 		return -EINVAL;
 	}

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

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

 	ts->client = client;
 	ts->input_dev = input_dev;

 	if (pdata)
 		ts->reset_gpio = pdata->reset_gpio;
 	else if (client->dev.of_node)
 		ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
 	else
 		ts->reset_gpio = -ENODEV;

 	if (gpio_is_valid(ts->reset_gpio)) {
 		error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
 		if (error) {
 			dev_err(&client->dev,
 				"Unable to request GPIO pin %d.\n",
 				ts->reset_gpio);
 				return error;
 		}
 	}

 	st1232_ts_power(ts, true);

 	input_dev->name = "st1232-touchscreen";
 	input_dev->id.bustype = BUS_I2C;
 	input_dev->dev.parent = &client->dev;

 	__set_bit(EV_SYN, input_dev->evbit);
 	__set_bit(EV_KEY, input_dev->evbit);
 	__set_bit(EV_ABS, input_dev->evbit);

 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
 	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
 	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);

 	error = devm_request_threaded_irq(&client->dev, client->irq,
 					  NULL, st1232_ts_irq_handler,
 					  IRQF_ONESHOT,
 					  client->name, ts);
 	if (error) {
 		dev_err(&client->dev, "Failed to register interrupt\n");
 		return error;
 	}

 	error = input_register_device(ts->input_dev);
 	if (error) {
 		dev_err(&client->dev, "Unable to register %s input device\n",
 			input_dev->name);
 		return error;
 	}

 	i2c_set_clientdata(client, ts);
 	device_init_wakeup(&client->dev, 1);

 	return 0;
 }

 static int st1232_ts_remove(struct i2c_client *client)
 {
 	struct st1232_ts_data *ts = i2c_get_clientdata(client);

 	st1232_ts_power(ts, false);

 	return 0;
 }

 static int __maybe_unused st1232_ts_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct st1232_ts_data *ts = i2c_get_clientdata(client);

 	if (device_may_wakeup(&client->dev)) {
 		enable_irq_wake(client->irq);
 	} else {
 		disable_irq(client->irq);
 		st1232_ts_power(ts, false);
 	}

 	return 0;
 }

 static int __maybe_unused st1232_ts_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct st1232_ts_data *ts = i2c_get_clientdata(client);

 	if (device_may_wakeup(&client->dev)) {
 		disable_irq_wake(client->irq);
 	} else {
 		st1232_ts_power(ts, true);
 		enable_irq(client->irq);
 	}

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
 			 st1232_ts_suspend, st1232_ts_resume);

 static const struct i2c_device_id st1232_ts_id[] = {
 	{ ST1232_TS_NAME, 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, st1232_ts_id);

 #ifdef CONFIG_OF
 static const struct of_device_id st1232_ts_dt_ids[] = {
 	{ .compatible = "sitronix,st1232", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
 #endif

 static struct i2c_driver st1232_ts_driver = {
 	.probe		= st1232_ts_probe,
 	.remove		= st1232_ts_remove,
 	.id_table	= st1232_ts_id,
 	.driver = {
 		.name	= ST1232_TS_NAME,
 		.of_match_table = of_match_ptr(st1232_ts_dt_ids),
 		.pm	= &st1232_ts_pm_ops,
 	},
 };

 module_i2c_driver(st1232_ts_driver);

 MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
 MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
 MODULE_LICENSE("GPL");
	/*
	* ST1232 Touchscreen Controller Driver
	*
	* Copyright (C) 2010 Renesas Solutions Corp.
	* Tony SIM <chinyeow.sim.xt@renesas.com>
	*
	* Using code from:
	* - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
	* Copyright (C) 2007 Google, Inc.
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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.
	*/

	#include <linux/delay.h>
	#include <linux/gpio.h>
	#include <linux/i2c.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/pm_qos.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/platform_data/st1232_pdata.h>

	#define ST1232_TS_NAME "st1232-ts"

	#define MIN_X 0x00
	#define MIN_Y 0x00
	#define MAX_X 0x31f /* (800 - 1) */
	#define MAX_Y 0x1df /* (480 - 1) */
	#define MAX_AREA 0xff
	#define MAX_FINGERS 2

	struct st1232_ts_finger {
	u16 x;
	u16 y;
	u8 t;
	bool is_valid;
	};

	struct st1232_ts_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	struct st1232_ts_finger finger[MAX_FINGERS];
	struct dev_pm_qos_request low_latency_req;
	int reset_gpio;
	};

	static int st1232_ts_read_data(struct st1232_ts_data *ts)
	{
	struct st1232_ts_finger *finger = ts->finger;
	struct i2c_client *client = ts->client;
	struct i2c_msg msg[2];
	int error;
	u8 start_reg;
	u8 buf[10];

	/* read touchscreen data from ST1232 */
	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = &start_reg;
	start_reg = 0x10;

	msg[1].addr = ts->client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].len = sizeof(buf);
	msg[1].buf = buf;

	error = i2c_transfer(client->adapter, msg, 2);
	if (error < 0)
	return error;

	/* get "valid" bits */
	finger[0].is_valid = buf[2] >> 7;
	finger[1].is_valid = buf[5] >> 7;

	/* get xy coordinate */
	if (finger[0].is_valid) {
	finger[0].x = ((buf[2] & 0x0070) << 4) \| buf[3];
	finger[0].y = ((buf[2] & 0x0007) << 8) \| buf[4];
	finger[0].t = buf[8];
	}

	if (finger[1].is_valid) {
	finger[1].x = ((buf[5] & 0x0070) << 4) \| buf[6];
	finger[1].y = ((buf[5] & 0x0007) << 8) \| buf[7];
	finger[1].t = buf[9];
	}

	return 0;
	}

	static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
	{
	struct st1232_ts_data *ts = dev_id;
	struct st1232_ts_finger *finger = ts->finger;
	struct input_dev *input_dev = ts->input_dev;
	int count = 0;
	int i, ret;

	ret = st1232_ts_read_data(ts);
	if (ret < 0)
	goto end;

	/* multi touch protocol */
	for (i = 0; i < MAX_FINGERS; i++) {
	if (!finger[i].is_valid)
	continue;

	input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
	input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
	input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
	input_mt_sync(input_dev);
	count++;
	}

	/* SYN_MT_REPORT only if no contact */
	if (!count) {
	input_mt_sync(input_dev);
	if (ts->low_latency_req.dev) {
	dev_pm_qos_remove_request(&ts->low_latency_req);
	ts->low_latency_req.dev = NULL;
	}
	} else if (!ts->low_latency_req.dev) {
	/* First contact, request 100 us latency. */
	dev_pm_qos_add_ancestor_request(&ts->client->dev,
	&ts->low_latency_req,
	DEV_PM_QOS_RESUME_LATENCY, 100);
	}

	/* SYN_REPORT */
	input_sync(input_dev);

	end:
	return IRQ_HANDLED;
	}

	static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
	{
	if (gpio_is_valid(ts->reset_gpio))
	gpio_direction_output(ts->reset_gpio, poweron);
	}

	static int st1232_ts_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct st1232_ts_data *ts;
	struct st1232_pdata *pdata = dev_get_platdata(&client->dev);
	struct input_dev *input_dev;
	int error;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	dev_err(&client->dev, "need I2C_FUNC_I2C\n");
	return -EIO;
	}

	if (!client->irq) {
	dev_err(&client->dev, "no IRQ?\n");
	return -EINVAL;
	}

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

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

	ts->client = client;
	ts->input_dev = input_dev;

	if (pdata)
	ts->reset_gpio = pdata->reset_gpio;
	else if (client->dev.of_node)
	ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
	else
	ts->reset_gpio = -ENODEV;

	if (gpio_is_valid(ts->reset_gpio)) {
	error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
	if (error) {
	dev_err(&client->dev,
	"Unable to request GPIO pin %d.\n",
	ts->reset_gpio);
	return error;
	}
	}

	st1232_ts_power(ts, true);

	input_dev->name = "st1232-touchscreen";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	__set_bit(EV_SYN, input_dev->evbit);
	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(EV_ABS, input_dev->evbit);

	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);

	error = devm_request_threaded_irq(&client->dev, client->irq,
	NULL, st1232_ts_irq_handler,
	IRQF_ONESHOT,
	client->name, ts);
	if (error) {
	dev_err(&client->dev, "Failed to register interrupt\n");
	return error;
	}

	error = input_register_device(ts->input_dev);
	if (error) {
	dev_err(&client->dev, "Unable to register %s input device\n",
	input_dev->name);
	return error;
	}

	i2c_set_clientdata(client, ts);
	device_init_wakeup(&client->dev, 1);

	return 0;
	}

	static int st1232_ts_remove(struct i2c_client *client)
	{
	struct st1232_ts_data *ts = i2c_get_clientdata(client);

	st1232_ts_power(ts, false);

	return 0;
	}

	static int __maybe_unused st1232_ts_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct st1232_ts_data *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev)) {
	enable_irq_wake(client->irq);
	} else {
	disable_irq(client->irq);
	st1232_ts_power(ts, false);
	}

	return 0;
	}

	static int __maybe_unused st1232_ts_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct st1232_ts_data *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev)) {
	disable_irq_wake(client->irq);
	} else {
	st1232_ts_power(ts, true);
	enable_irq(client->irq);
	}

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
	st1232_ts_suspend, st1232_ts_resume);

	static const struct i2c_device_id st1232_ts_id[] = {
	{ ST1232_TS_NAME, 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, st1232_ts_id);

	#ifdef CONFIG_OF
	static const struct of_device_id st1232_ts_dt_ids[] = {
	{ .compatible = "sitronix,st1232", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
	#endif

	static struct i2c_driver st1232_ts_driver = {
	.probe = st1232_ts_probe,
	.remove = st1232_ts_remove,
	.id_table = st1232_ts_id,
	.driver = {
	.name = ST1232_TS_NAME,
	.of_match_table = of_match_ptr(st1232_ts_dt_ids),
	.pm = &st1232_ts_pm_ops,
	},
	};

	module_i2c_driver(st1232_ts_driver);

	MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
	MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
	MODULE_LICENSE("GPL");