drivers/input/joystick/as5011.c - linux - Git at Google

 /*
  * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
  * Sponsored by ARMadeus Systems
  *
  * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
  * Driver for Austria Microsystems joysticks AS5011
  *
  * TODO:
  *	- Power on the chip when open() and power down when close()
  *	- Manage power mode
  */

 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/input.h>
 #include <linux/gpio.h>
 #include <linux/delay.h>
 #include <linux/input/as5011.h>
 #include <linux/slab.h>
 #include <linux/module.h>

 #define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
 #define MODULE_DEVICE_ALIAS "as5011"

 MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");

 /* registers */
 #define AS5011_CTRL1		0x76
 #define AS5011_CTRL2		0x75
 #define AS5011_XP		0x43
 #define AS5011_XN		0x44
 #define AS5011_YP		0x53
 #define AS5011_YN		0x54
 #define AS5011_X_REG		0x41
 #define AS5011_Y_REG		0x42
 #define AS5011_X_RES_INT	0x51
 #define AS5011_Y_RES_INT	0x52

 /* CTRL1 bits */
 #define AS5011_CTRL1_LP_PULSED		0x80
 #define AS5011_CTRL1_LP_ACTIVE		0x40
 #define AS5011_CTRL1_LP_CONTINUE	0x20
 #define AS5011_CTRL1_INT_WUP_EN		0x10
 #define AS5011_CTRL1_INT_ACT_EN		0x08
 #define AS5011_CTRL1_EXT_CLK_EN		0x04
 #define AS5011_CTRL1_SOFT_RST		0x02
 #define AS5011_CTRL1_DATA_VALID		0x01

 /* CTRL2 bits */
 #define AS5011_CTRL2_EXT_SAMPLE_EN	0x08
 #define AS5011_CTRL2_RC_BIAS_ON		0x04
 #define AS5011_CTRL2_INV_SPINNING	0x02

 #define AS5011_MAX_AXIS	80
 #define AS5011_MIN_AXIS	(-80)
 #define AS5011_FUZZ	8
 #define AS5011_FLAT	40

 struct as5011_device {
 	struct input_dev *input_dev;
 	struct i2c_client *i2c_client;
 	unsigned int button_gpio;
 	unsigned int button_irq;
 	unsigned int axis_irq;
 };

 static int as5011_i2c_write(struct i2c_client *client,
 			    uint8_t aregaddr,
 			    uint8_t avalue)
 {
 	uint8_t data[2] = { aregaddr, avalue };
 	struct i2c_msg msg = {
 		.addr = client->addr,
 		.flags = I2C_M_IGNORE_NAK,
 		.len = 2,
 		.buf = (uint8_t *)data
 	};
 	int error;

 	error = i2c_transfer(client->adapter, &msg, 1);
 	return error < 0 ? error : 0;
 }

 static int as5011_i2c_read(struct i2c_client *client,
 			   uint8_t aregaddr, signed char *value)
 {
 	uint8_t data[2] = { aregaddr };
 	struct i2c_msg msg_set[2] = {
 		{
 			.addr = client->addr,
 			.flags = I2C_M_REV_DIR_ADDR,
 			.len = 1,
 			.buf = (uint8_t *)data
 		},
 		{
 			.addr = client->addr,
 			.flags = I2C_M_RD | I2C_M_NOSTART,
 			.len = 1,
 			.buf = (uint8_t *)data
 		}
 	};
 	int error;

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

 	*value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0];
 	return 0;
 }

 static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
 {
 	struct as5011_device *as5011 = dev_id;
 	int val = gpio_get_value_cansleep(as5011->button_gpio);

 	input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
 	input_sync(as5011->input_dev);

 	return IRQ_HANDLED;
 }

 static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
 {
 	struct as5011_device *as5011 = dev_id;
 	int error;
 	signed char x, y;

 	error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
 	if (error < 0)
 		goto out;

 	error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
 	if (error < 0)
 		goto out;

 	input_report_abs(as5011->input_dev, ABS_X, x);
 	input_report_abs(as5011->input_dev, ABS_Y, y);
 	input_sync(as5011->input_dev);

 out:
 	return IRQ_HANDLED;
 }

 static int as5011_configure_chip(struct as5011_device *as5011,
 				const struct as5011_platform_data *plat_dat)
 {
 	struct i2c_client *client = as5011->i2c_client;
 	int error;
 	signed char value;

 	/* chip soft reset */
 	error = as5011_i2c_write(client, AS5011_CTRL1,
 				 AS5011_CTRL1_SOFT_RST);
 	if (error < 0) {
 		dev_err(&client->dev, "Soft reset failed\n");
 		return error;
 	}

 	mdelay(10);

 	error = as5011_i2c_write(client, AS5011_CTRL1,
 				 AS5011_CTRL1_LP_PULSED |
 				 AS5011_CTRL1_LP_ACTIVE |
 				 AS5011_CTRL1_INT_ACT_EN);
 	if (error < 0) {
 		dev_err(&client->dev, "Power config failed\n");
 		return error;
 	}

 	error = as5011_i2c_write(client, AS5011_CTRL2,
 				 AS5011_CTRL2_INV_SPINNING);
 	if (error < 0) {
 		dev_err(&client->dev, "Can't invert spinning\n");
 		return error;
 	}

 	/* write threshold */
 	error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
 	if (error < 0) {
 		dev_err(&client->dev, "Can't write threshold\n");
 		return error;
 	}

 	error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
 	if (error < 0) {
 		dev_err(&client->dev, "Can't write threshold\n");
 		return error;
 	}

 	error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
 	if (error < 0) {
 		dev_err(&client->dev, "Can't write threshold\n");
 		return error;
 	}

 	error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
 	if (error < 0) {
 		dev_err(&client->dev, "Can't write threshold\n");
 		return error;
 	}

 	/* to free irq gpio in chip */
 	error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
 	if (error < 0) {
 		dev_err(&client->dev, "Can't read i2c X resolution value\n");
 		return error;
 	}

 	return 0;
 }

 static int as5011_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	const struct as5011_platform_data *plat_data;
 	struct as5011_device *as5011;
 	struct input_dev *input_dev;
 	int irq;
 	int error;

 	plat_data = dev_get_platdata(&client->dev);
 	if (!plat_data)
 		return -EINVAL;

 	if (!plat_data->axis_irq) {
 		dev_err(&client->dev, "No axis IRQ?\n");
 		return -EINVAL;
 	}

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_NOSTART |
 				     I2C_FUNC_PROTOCOL_MANGLING)) {
 		dev_err(&client->dev,
 			"need i2c bus that supports protocol mangling\n");
 		return -ENODEV;
 	}

 	as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!as5011 || !input_dev) {
 		dev_err(&client->dev,
 			"Can't allocate memory for device structure\n");
 		error = -ENOMEM;
 		goto err_free_mem;
 	}

 	as5011->i2c_client = client;
 	as5011->input_dev = input_dev;
 	as5011->button_gpio = plat_data->button_gpio;
 	as5011->axis_irq = plat_data->axis_irq;

 	input_dev->name = "Austria Microsystem as5011 joystick";
 	input_dev->id.bustype = BUS_I2C;
 	input_dev->dev.parent = &client->dev;

 	input_set_capability(input_dev, EV_KEY, BTN_JOYSTICK);

 	input_set_abs_params(input_dev, ABS_X,
 		AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
 	input_set_abs_params(as5011->input_dev, ABS_Y,
 		AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);

 	error = gpio_request(as5011->button_gpio, "AS5011 button");
 	if (error < 0) {
 		dev_err(&client->dev, "Failed to request button gpio\n");
 		goto err_free_mem;
 	}

 	irq = gpio_to_irq(as5011->button_gpio);
 	if (irq < 0) {
 		dev_err(&client->dev,
 			"Failed to get irq number for button gpio\n");
 		error = irq;
 		goto err_free_button_gpio;
 	}

 	as5011->button_irq = irq;

 	error = request_threaded_irq(as5011->button_irq,
 				     NULL, as5011_button_interrupt,
 				     IRQF_TRIGGER_RISING |
 					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 				     "as5011_button", as5011);
 	if (error < 0) {
 		dev_err(&client->dev,
 			"Can't allocate button irq %d\n", as5011->button_irq);
 		goto err_free_button_gpio;
 	}

 	error = as5011_configure_chip(as5011, plat_data);
 	if (error)
 		goto err_free_button_irq;

 	error = request_threaded_irq(as5011->axis_irq, NULL,
 				     as5011_axis_interrupt,
 				     plat_data->axis_irqflags | IRQF_ONESHOT,
 				     "as5011_joystick", as5011);
 	if (error) {
 		dev_err(&client->dev,
 			"Can't allocate axis irq %d\n", plat_data->axis_irq);
 		goto err_free_button_irq;
 	}

 	error = input_register_device(as5011->input_dev);
 	if (error) {
 		dev_err(&client->dev, "Failed to register input device\n");
 		goto err_free_axis_irq;
 	}

 	i2c_set_clientdata(client, as5011);

 	return 0;

 err_free_axis_irq:
 	free_irq(as5011->axis_irq, as5011);
 err_free_button_irq:
 	free_irq(as5011->button_irq, as5011);
 err_free_button_gpio:
 	gpio_free(as5011->button_gpio);
 err_free_mem:
 	input_free_device(input_dev);
 	kfree(as5011);

 	return error;
 }

 static int as5011_remove(struct i2c_client *client)
 {
 	struct as5011_device *as5011 = i2c_get_clientdata(client);

 	free_irq(as5011->axis_irq, as5011);
 	free_irq(as5011->button_irq, as5011);
 	gpio_free(as5011->button_gpio);

 	input_unregister_device(as5011->input_dev);
 	kfree(as5011);

 	return 0;
 }

 static const struct i2c_device_id as5011_id[] = {
 	{ MODULE_DEVICE_ALIAS, 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, as5011_id);

 static struct i2c_driver as5011_driver = {
 	.driver = {
 		.name = "as5011",
 	},
 	.probe		= as5011_probe,
 	.remove		= as5011_remove,
 	.id_table	= as5011_id,
 };

 module_i2c_driver(as5011_driver);
	/*
	* Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
	* Sponsored by ARMadeus Systems
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* Driver for Austria Microsystems joysticks AS5011
	*
	* TODO:
	* - Power on the chip when open() and power down when close()
	* - Manage power mode
	*/

	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/input.h>
	#include <linux/gpio.h>
	#include <linux/delay.h>
	#include <linux/input/as5011.h>
	#include <linux/slab.h>
	#include <linux/module.h>

	#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
	#define MODULE_DEVICE_ALIAS "as5011"

	MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");

	/* registers */
	#define AS5011_CTRL1 0x76
	#define AS5011_CTRL2 0x75
	#define AS5011_XP 0x43
	#define AS5011_XN 0x44
	#define AS5011_YP 0x53
	#define AS5011_YN 0x54
	#define AS5011_X_REG 0x41
	#define AS5011_Y_REG 0x42
	#define AS5011_X_RES_INT 0x51
	#define AS5011_Y_RES_INT 0x52

	/* CTRL1 bits */
	#define AS5011_CTRL1_LP_PULSED 0x80
	#define AS5011_CTRL1_LP_ACTIVE 0x40
	#define AS5011_CTRL1_LP_CONTINUE 0x20
	#define AS5011_CTRL1_INT_WUP_EN 0x10
	#define AS5011_CTRL1_INT_ACT_EN 0x08
	#define AS5011_CTRL1_EXT_CLK_EN 0x04
	#define AS5011_CTRL1_SOFT_RST 0x02
	#define AS5011_CTRL1_DATA_VALID 0x01

	/* CTRL2 bits */
	#define AS5011_CTRL2_EXT_SAMPLE_EN 0x08
	#define AS5011_CTRL2_RC_BIAS_ON 0x04
	#define AS5011_CTRL2_INV_SPINNING 0x02

	#define AS5011_MAX_AXIS 80
	#define AS5011_MIN_AXIS (-80)
	#define AS5011_FUZZ 8
	#define AS5011_FLAT 40

	struct as5011_device {
	struct input_dev *input_dev;
	struct i2c_client *i2c_client;
	unsigned int button_gpio;
	unsigned int button_irq;
	unsigned int axis_irq;
	};

	static int as5011_i2c_write(struct i2c_client *client,
	uint8_t aregaddr,
	uint8_t avalue)
	{
	uint8_t data[2] = { aregaddr, avalue };
	struct i2c_msg msg = {
	.addr = client->addr,
	.flags = I2C_M_IGNORE_NAK,
	.len = 2,
	.buf = (uint8_t *)data
	};
	int error;

	error = i2c_transfer(client->adapter, &msg, 1);
	return error < 0 ? error : 0;
	}

	static int as5011_i2c_read(struct i2c_client *client,
	uint8_t aregaddr, signed char *value)
	{
	uint8_t data[2] = { aregaddr };
	struct i2c_msg msg_set[2] = {
	{
	.addr = client->addr,
	.flags = I2C_M_REV_DIR_ADDR,
	.len = 1,
	.buf = (uint8_t *)data
	},
	{
	.addr = client->addr,
	.flags = I2C_M_RD \| I2C_M_NOSTART,
	.len = 1,
	.buf = (uint8_t *)data
	}
	};
	int error;

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

	value = data[0] & 0x80 ? -1 (1 + ~data[0]) : data[0];
	return 0;
	}

	static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
	{
	struct as5011_device *as5011 = dev_id;
	int val = gpio_get_value_cansleep(as5011->button_gpio);

	input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
	input_sync(as5011->input_dev);

	return IRQ_HANDLED;
	}

	static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
	{
	struct as5011_device *as5011 = dev_id;
	int error;
	signed char x, y;

	error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
	if (error < 0)
	goto out;

	error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
	if (error < 0)
	goto out;

	input_report_abs(as5011->input_dev, ABS_X, x);
	input_report_abs(as5011->input_dev, ABS_Y, y);
	input_sync(as5011->input_dev);

	out:
	return IRQ_HANDLED;
	}

	static int as5011_configure_chip(struct as5011_device *as5011,
	const struct as5011_platform_data *plat_dat)
	{
	struct i2c_client *client = as5011->i2c_client;
	int error;
	signed char value;

	/* chip soft reset */
	error = as5011_i2c_write(client, AS5011_CTRL1,
	AS5011_CTRL1_SOFT_RST);
	if (error < 0) {
	dev_err(&client->dev, "Soft reset failed\n");
	return error;
	}

	mdelay(10);

	error = as5011_i2c_write(client, AS5011_CTRL1,
	AS5011_CTRL1_LP_PULSED \|
	AS5011_CTRL1_LP_ACTIVE \|
	AS5011_CTRL1_INT_ACT_EN);
	if (error < 0) {
	dev_err(&client->dev, "Power config failed\n");
	return error;
	}

	error = as5011_i2c_write(client, AS5011_CTRL2,
	AS5011_CTRL2_INV_SPINNING);
	if (error < 0) {
	dev_err(&client->dev, "Can't invert spinning\n");
	return error;
	}

	/* write threshold */
	error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
	if (error < 0) {
	dev_err(&client->dev, "Can't write threshold\n");
	return error;
	}

	error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
	if (error < 0) {
	dev_err(&client->dev, "Can't write threshold\n");
	return error;
	}

	error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
	if (error < 0) {
	dev_err(&client->dev, "Can't write threshold\n");
	return error;
	}

	error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
	if (error < 0) {
	dev_err(&client->dev, "Can't write threshold\n");
	return error;
	}

	/* to free irq gpio in chip */
	error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
	if (error < 0) {
	dev_err(&client->dev, "Can't read i2c X resolution value\n");
	return error;
	}

	return 0;
	}

	static int as5011_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	const struct as5011_platform_data *plat_data;
	struct as5011_device *as5011;
	struct input_dev *input_dev;
	int irq;
	int error;

	plat_data = dev_get_platdata(&client->dev);
	if (!plat_data)
	return -EINVAL;

	if (!plat_data->axis_irq) {
	dev_err(&client->dev, "No axis IRQ?\n");
	return -EINVAL;
	}

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_NOSTART \|
	I2C_FUNC_PROTOCOL_MANGLING)) {
	dev_err(&client->dev,
	"need i2c bus that supports protocol mangling\n");
	return -ENODEV;
	}

	as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!as5011 \|\| !input_dev) {
	dev_err(&client->dev,
	"Can't allocate memory for device structure\n");
	error = -ENOMEM;
	goto err_free_mem;
	}

	as5011->i2c_client = client;
	as5011->input_dev = input_dev;
	as5011->button_gpio = plat_data->button_gpio;
	as5011->axis_irq = plat_data->axis_irq;

	input_dev->name = "Austria Microsystem as5011 joystick";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	input_set_capability(input_dev, EV_KEY, BTN_JOYSTICK);

	input_set_abs_params(input_dev, ABS_X,
	AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
	input_set_abs_params(as5011->input_dev, ABS_Y,
	AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);

	error = gpio_request(as5011->button_gpio, "AS5011 button");
	if (error < 0) {
	dev_err(&client->dev, "Failed to request button gpio\n");
	goto err_free_mem;
	}

	irq = gpio_to_irq(as5011->button_gpio);
	if (irq < 0) {
	dev_err(&client->dev,
	"Failed to get irq number for button gpio\n");
	error = irq;
	goto err_free_button_gpio;
	}

	as5011->button_irq = irq;

	error = request_threaded_irq(as5011->button_irq,
	NULL, as5011_button_interrupt,
	IRQF_TRIGGER_RISING \|
	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	"as5011_button", as5011);
	if (error < 0) {
	dev_err(&client->dev,
	"Can't allocate button irq %d\n", as5011->button_irq);
	goto err_free_button_gpio;
	}

	error = as5011_configure_chip(as5011, plat_data);
	if (error)
	goto err_free_button_irq;

	error = request_threaded_irq(as5011->axis_irq, NULL,
	as5011_axis_interrupt,
	plat_data->axis_irqflags \| IRQF_ONESHOT,
	"as5011_joystick", as5011);
	if (error) {
	dev_err(&client->dev,
	"Can't allocate axis irq %d\n", plat_data->axis_irq);
	goto err_free_button_irq;
	}

	error = input_register_device(as5011->input_dev);
	if (error) {
	dev_err(&client->dev, "Failed to register input device\n");
	goto err_free_axis_irq;
	}

	i2c_set_clientdata(client, as5011);

	return 0;

	err_free_axis_irq:
	free_irq(as5011->axis_irq, as5011);
	err_free_button_irq:
	free_irq(as5011->button_irq, as5011);
	err_free_button_gpio:
	gpio_free(as5011->button_gpio);
	err_free_mem:
	input_free_device(input_dev);
	kfree(as5011);

	return error;
	}

	static int as5011_remove(struct i2c_client *client)
	{
	struct as5011_device *as5011 = i2c_get_clientdata(client);

	free_irq(as5011->axis_irq, as5011);
	free_irq(as5011->button_irq, as5011);
	gpio_free(as5011->button_gpio);

	input_unregister_device(as5011->input_dev);
	kfree(as5011);

	return 0;
	}

	static const struct i2c_device_id as5011_id[] = {
	{ MODULE_DEVICE_ALIAS, 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, as5011_id);

	static struct i2c_driver as5011_driver = {
	.driver = {
	.name = "as5011",
	},
	.probe = as5011_probe,
	.remove = as5011_remove,
	.id_table = as5011_id,
	};

	module_i2c_driver(as5011_driver);