drivers/input/keyboard/qt1070.c - kernel/msm - Gitiles

 /*
  *  Atmel AT42QT1070 QTouch Sensor Controller
  *
  *  Copyright (C) 2011 Atmel
  *
  *  Authors: Bo Shen <voice.shen@atmel.com>
  *
  *  Base on AT42QT2160 driver by:
  *  Raphael Derosso Pereira <raphaelpereira@gmail.com>
  *  Copyright (C) 2009
  *
  *  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.
  *
  *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/jiffies.h>
 #include <linux/delay.h>

 /* Address for each register */
 #define CHIP_ID            0x00
 #define QT1070_CHIP_ID     0x2E

 #define FW_VERSION         0x01
 #define QT1070_FW_VERSION  0x15

 #define DET_STATUS         0x02

 #define KEY_STATUS         0x03

 /* Calibrate */
 #define CALIBRATE_CMD      0x38
 #define QT1070_CAL_TIME    200

 /* Reset */
 #define RESET              0x39
 #define QT1070_RESET_TIME  255

 /* AT42QT1070 support up to 7 keys */
 static const unsigned short qt1070_key2code[] = {
 	KEY_0, KEY_1, KEY_2, KEY_3,
 	KEY_4, KEY_5, KEY_6,
 };

 struct qt1070_data {
 	struct i2c_client *client;
 	struct input_dev *input;
 	unsigned int irq;
 	unsigned short keycodes[ARRAY_SIZE(qt1070_key2code)];
 	u8 last_keys;
 };

 static int qt1070_read(struct i2c_client *client, u8 reg)
 {
 	int ret;

 	ret = i2c_smbus_read_byte_data(client, reg);
 	if (ret < 0)
 		dev_err(&client->dev,
 			"can not read register, returned %d\n", ret);

 	return ret;
 }

 static int qt1070_write(struct i2c_client *client, u8 reg, u8 data)
 {
 	int ret;

 	ret = i2c_smbus_write_byte_data(client, reg, data);
 	if (ret < 0)
 		dev_err(&client->dev,
 			"can not write register, returned %d\n", ret);

 	return ret;
 }

 static bool __devinit qt1070_identify(struct i2c_client *client)
 {
 	int id, ver;

 	/* Read Chip ID */
 	id = qt1070_read(client, CHIP_ID);
 	if (id != QT1070_CHIP_ID) {
 		dev_err(&client->dev, "ID %d not supported\n", id);
 		return false;
 	}

 	/* Read firmware version */
 	ver = qt1070_read(client, FW_VERSION);
 	if (ver < 0) {
 		dev_err(&client->dev, "could not read the firmware version\n");
 		return false;
 	}

 	dev_info(&client->dev, "AT42QT1070 firmware version %x\n", ver);

 	return true;
 }

 static irqreturn_t qt1070_interrupt(int irq, void *dev_id)
 {
 	struct qt1070_data *data = dev_id;
 	struct i2c_client *client = data->client;
 	struct input_dev *input = data->input;
 	int i;
 	u8 new_keys, keyval, mask = 0x01;

 	/* Read the detected status register, thus clearing interrupt */
 	qt1070_read(client, DET_STATUS);

 	/* Read which key changed */
 	new_keys = qt1070_read(client, KEY_STATUS);

 	for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) {
 		keyval = new_keys & mask;
 		if ((data->last_keys & mask) != keyval)
 			input_report_key(input, data->keycodes[i], keyval);
 		mask <<= 1;
 	}
 	input_sync(input);

 	data->last_keys = new_keys;
 	return IRQ_HANDLED;
 }

 static int __devinit qt1070_probe(struct i2c_client *client,
 				const struct i2c_device_id *id)
 {
 	struct qt1070_data *data;
 	struct input_dev *input;
 	int i;
 	int err;

 	err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE);
 	if (!err) {
 		dev_err(&client->dev, "%s adapter not supported\n",
 			dev_driver_string(&client->adapter->dev));
 		return -ENODEV;
 	}

 	if (!client->irq) {
 		dev_err(&client->dev, "please assign the irq to this device\n");
 		return -EINVAL;
 	}

 	/* Identify the qt1070 chip */
 	if (!qt1070_identify(client))
 		return -ENODEV;

 	data = kzalloc(sizeof(struct qt1070_data), GFP_KERNEL);
 	input = input_allocate_device();
 	if (!data || !input) {
 		dev_err(&client->dev, "insufficient memory\n");
 		err = -ENOMEM;
 		goto err_free_mem;
 	}

 	data->client = client;
 	data->input = input;
 	data->irq = client->irq;

 	input->name = "AT42QT1070 QTouch Sensor";
 	input->dev.parent = &client->dev;
 	input->id.bustype = BUS_I2C;

 	/* Add the keycode */
 	input->keycode = data->keycodes;
 	input->keycodesize = sizeof(data->keycodes[0]);
 	input->keycodemax = ARRAY_SIZE(qt1070_key2code);

 	__set_bit(EV_KEY, input->evbit);

 	for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) {
 		data->keycodes[i] = qt1070_key2code[i];
 		__set_bit(qt1070_key2code[i], input->keybit);
 	}

 	/* Calibrate device */
 	qt1070_write(client, CALIBRATE_CMD, 1);
 	msleep(QT1070_CAL_TIME);

 	/* Soft reset */
 	qt1070_write(client, RESET, 1);
 	msleep(QT1070_RESET_TIME);

 	err = request_threaded_irq(client->irq, NULL, qt1070_interrupt,
 		IRQF_TRIGGER_NONE, client->dev.driver->name, data);
 	if (err) {
 		dev_err(&client->dev, "fail to request irq\n");
 		goto err_free_mem;
 	}

 	/* Register the input device */
 	err = input_register_device(data->input);
 	if (err) {
 		dev_err(&client->dev, "Failed to register input device\n");
 		goto err_free_irq;
 	}

 	i2c_set_clientdata(client, data);

 	/* Read to clear the chang line */
 	qt1070_read(client, DET_STATUS);

 	return 0;

 err_free_irq:
 	free_irq(client->irq, data);
 err_free_mem:
 	input_free_device(input);
 	kfree(data);
 	return err;
 }

 static int __devexit qt1070_remove(struct i2c_client *client)
 {
 	struct qt1070_data *data = i2c_get_clientdata(client);

 	/* Release IRQ */
 	free_irq(client->irq, data);

 	input_unregister_device(data->input);
 	kfree(data);

 	return 0;
 }

 static const struct i2c_device_id qt1070_id[] = {
 	{ "qt1070", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, qt1070_id);

 static struct i2c_driver qt1070_driver = {
 	.driver	= {
 		.name	= "qt1070",
 		.owner	= THIS_MODULE,
 	},
 	.id_table	= qt1070_id,
 	.probe		= qt1070_probe,
 	.remove		= __devexit_p(qt1070_remove),
 };

 module_i2c_driver(qt1070_driver);

 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
 MODULE_DESCRIPTION("Driver for AT42QT1070 QTouch sensor");
 MODULE_LICENSE("GPL");
	/*
	* Atmel AT42QT1070 QTouch Sensor Controller
	*
	* Copyright (C) 2011 Atmel
	*
	* Authors: Bo Shen <voice.shen@atmel.com>
	*
	* Base on AT42QT2160 driver by:
	* Raphael Derosso Pereira <raphaelpereira@gmail.com>
	* Copyright (C) 2009
	*
	* 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.
	*
	* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/i2c.h>
	#include <linux/input.h>
	#include <linux/slab.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/jiffies.h>
	#include <linux/delay.h>

	/* Address for each register */
	#define CHIP_ID 0x00
	#define QT1070_CHIP_ID 0x2E

	#define FW_VERSION 0x01
	#define QT1070_FW_VERSION 0x15

	#define DET_STATUS 0x02

	#define KEY_STATUS 0x03

	/* Calibrate */
	#define CALIBRATE_CMD 0x38
	#define QT1070_CAL_TIME 200

	/* Reset */
	#define RESET 0x39
	#define QT1070_RESET_TIME 255

	/* AT42QT1070 support up to 7 keys */
	static const unsigned short qt1070_key2code[] = {
	KEY_0, KEY_1, KEY_2, KEY_3,
	KEY_4, KEY_5, KEY_6,
	};

	struct qt1070_data {
	struct i2c_client *client;
	struct input_dev *input;
	unsigned int irq;
	unsigned short keycodes[ARRAY_SIZE(qt1070_key2code)];
	u8 last_keys;
	};

	static int qt1070_read(struct i2c_client *client, u8 reg)
	{
	int ret;

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0)
	dev_err(&client->dev,
	"can not read register, returned %d\n", ret);

	return ret;
	}

	static int qt1070_write(struct i2c_client *client, u8 reg, u8 data)
	{
	int ret;

	ret = i2c_smbus_write_byte_data(client, reg, data);
	if (ret < 0)
	dev_err(&client->dev,
	"can not write register, returned %d\n", ret);

	return ret;
	}

	static bool __devinit qt1070_identify(struct i2c_client *client)
	{
	int id, ver;

	/* Read Chip ID */
	id = qt1070_read(client, CHIP_ID);
	if (id != QT1070_CHIP_ID) {
	dev_err(&client->dev, "ID %d not supported\n", id);
	return false;
	}

	/* Read firmware version */
	ver = qt1070_read(client, FW_VERSION);
	if (ver < 0) {
	dev_err(&client->dev, "could not read the firmware version\n");
	return false;
	}

	dev_info(&client->dev, "AT42QT1070 firmware version %x\n", ver);

	return true;
	}

	static irqreturn_t qt1070_interrupt(int irq, void *dev_id)
	{
	struct qt1070_data *data = dev_id;
	struct i2c_client *client = data->client;
	struct input_dev *input = data->input;
	int i;
	u8 new_keys, keyval, mask = 0x01;

	/* Read the detected status register, thus clearing interrupt */
	qt1070_read(client, DET_STATUS);

	/* Read which key changed */
	new_keys = qt1070_read(client, KEY_STATUS);

	for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) {
	keyval = new_keys & mask;
	if ((data->last_keys & mask) != keyval)
	input_report_key(input, data->keycodes[i], keyval);
	mask <<= 1;
	}
	input_sync(input);

	data->last_keys = new_keys;
	return IRQ_HANDLED;
	}

	static int __devinit qt1070_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct qt1070_data *data;
	struct input_dev *input;
	int i;
	int err;

	err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE);
	if (!err) {
	dev_err(&client->dev, "%s adapter not supported\n",
	dev_driver_string(&client->adapter->dev));
	return -ENODEV;
	}

	if (!client->irq) {
	dev_err(&client->dev, "please assign the irq to this device\n");
	return -EINVAL;
	}

	/* Identify the qt1070 chip */
	if (!qt1070_identify(client))
	return -ENODEV;

	data = kzalloc(sizeof(struct qt1070_data), GFP_KERNEL);
	input = input_allocate_device();
	if (!data \|\| !input) {
	dev_err(&client->dev, "insufficient memory\n");
	err = -ENOMEM;
	goto err_free_mem;
	}

	data->client = client;
	data->input = input;
	data->irq = client->irq;

	input->name = "AT42QT1070 QTouch Sensor";
	input->dev.parent = &client->dev;
	input->id.bustype = BUS_I2C;

	/* Add the keycode */
	input->keycode = data->keycodes;
	input->keycodesize = sizeof(data->keycodes[0]);
	input->keycodemax = ARRAY_SIZE(qt1070_key2code);

	__set_bit(EV_KEY, input->evbit);

	for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) {
	data->keycodes[i] = qt1070_key2code[i];
	__set_bit(qt1070_key2code[i], input->keybit);
	}

	/* Calibrate device */
	qt1070_write(client, CALIBRATE_CMD, 1);
	msleep(QT1070_CAL_TIME);

	/* Soft reset */
	qt1070_write(client, RESET, 1);
	msleep(QT1070_RESET_TIME);

	err = request_threaded_irq(client->irq, NULL, qt1070_interrupt,
	IRQF_TRIGGER_NONE, client->dev.driver->name, data);
	if (err) {
	dev_err(&client->dev, "fail to request irq\n");
	goto err_free_mem;
	}

	/* Register the input device */
	err = input_register_device(data->input);
	if (err) {
	dev_err(&client->dev, "Failed to register input device\n");
	goto err_free_irq;
	}

	i2c_set_clientdata(client, data);

	/* Read to clear the chang line */
	qt1070_read(client, DET_STATUS);

	return 0;

	err_free_irq:
	free_irq(client->irq, data);
	err_free_mem:
	input_free_device(input);
	kfree(data);
	return err;
	}

	static int __devexit qt1070_remove(struct i2c_client *client)
	{
	struct qt1070_data *data = i2c_get_clientdata(client);

	/* Release IRQ */
	free_irq(client->irq, data);

	input_unregister_device(data->input);
	kfree(data);

	return 0;
	}

	static const struct i2c_device_id qt1070_id[] = {
	{ "qt1070", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(i2c, qt1070_id);

	static struct i2c_driver qt1070_driver = {
	.driver = {
	.name = "qt1070",
	.owner = THIS_MODULE,
	},
	.id_table = qt1070_id,
	.probe = qt1070_probe,
	.remove = __devexit_p(qt1070_remove),
	};

	module_i2c_driver(qt1070_driver);

	MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
	MODULE_DESCRIPTION("Driver for AT42QT1070 QTouch sensor");
	MODULE_LICENSE("GPL");