Date:	Tue, 23 Nov 2010 17:36:14 +0100
From:	Fabien Marteau <fabien.marteau@...adeus.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Scott Moreau <oreaus@...il.com>
CC:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] input: joystick:   Adding Austria Microsystem AS5011 joystick
 driver

Driver for EasyPoint AS5011 2 axis joystick chip. This chip is plugged
on an I2C bus. It as been tested on ARM processor (i.MX27).

Signed-off-by: Fabien Marteau <fabien.marteau@...adeus.com>
---
 drivers/input/joystick/Kconfig  |    9 +
 drivers/input/joystick/Makefile |    1 +
 drivers/input/joystick/as5011.c |  454
+++++++++++++++++++++++++++++++++++++++
 include/linux/as5011.h          |   72 ++++++
 4 files changed, 536 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/joystick/as5011.c
 create mode 100644 include/linux/as5011.h

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 5b59616..5fad03e 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -255,6 +255,15 @@ config JOYSTICK_AMIGA
 	  To compile this driver as a module, choose M here: the
 	  module will be called amijoy.

+config JOYSTICK_AS5011
+	tristate "Austria Microsystem AS5011 joystick"
+	depends on I2C
+	help
+	  Say Y here if you have an AS5011 digital joystick.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called as5011.
+
 config JOYSTICK_JOYDUMP
 	tristate "Gameport data dumper"
 	select GAMEPORT
diff --git a/drivers/input/joystick/Makefile
b/drivers/input/joystick/Makefile
index f3a8cbe..92dc0de 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -7,6 +7,7 @@
 obj-$(CONFIG_JOYSTICK_A3D)		+= a3d.o
 obj-$(CONFIG_JOYSTICK_ADI)		+= adi.o
 obj-$(CONFIG_JOYSTICK_AMIGA)		+= amijoy.o
+obj-$(CONFIG_JOYSTICK_AS5011)		+= as5011.o
 obj-$(CONFIG_JOYSTICK_ANALOG)		+= analog.o
 obj-$(CONFIG_JOYSTICK_COBRA)		+= cobra.o
 obj-$(CONFIG_JOYSTICK_DB9)		+= db9.o
diff --git a/drivers/input/joystick/as5011.c
b/drivers/input/joystick/as5011.c
new file mode 100644
index 0000000..db0f129
--- /dev/null
+++ b/drivers/input/joystick/as5011.c
@@ -0,0 +1,454 @@
+/*
+ * Copyright (c) 2010 Fabien Marteau <fabien.marteau@...adeus.com>
+ *
+ * Sponsored by ARMadeus Systems
+ */
+
+/*
+ * Driver for Austria Microsystems joysticks AS5011
+ */
+
+/*
+ * 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
+ *
+ * TODO:
+ *	- Manage power mode
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/sysfs.h>
+#include <linux/ctype.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+
+#include <linux/as5011.h>
+#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
+
+MODULE_AUTHOR("Fabien Marteau <fabien.marteau@...adeus.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+#define SIZE_NAME 30
+#define AS5011_MAX_AXIS	80
+#define AS5011_MIN_AXIS	(-80)
+#define AS5011_FUZZ	8
+#define AS5011_FLAT	40
+
+static int g_num = 1; /* device counter */
+
+static signed char as5011_i2c_read(struct i2c_client *client,
+			   uint8_t aRegAddr);
+static int as5011_i2c_write(struct i2c_client *client,
+			    uint8_t aRegAddr,
+			    uint8_t aValue);
+
+/*
+ * interrupts operations
+ */
+
+static irqreturn_t button_interrupt(int irq, void *dev_id)
+{
+	struct as5011_platform_data *plat_dat =
+		(struct as5011_platform_data *)dev_id;
+	int ret;
+
+	ret = gpio_get_value(plat_dat->button_gpio);
+	if (ret)
+		input_report_key(plat_dat->input_dev, BTN_JOYSTICK, 0);
+	else
+		input_report_key(plat_dat->input_dev, BTN_JOYSTICK, 1);
+	input_sync(plat_dat->input_dev);
+	return IRQ_HANDLED;
+}
+
+static void as5011_update_axes(struct work_struct *work)
+{
+	struct as5011_platform_data *plat_dat =
+		container_of(work,
+			     struct as5011_platform_data,
+			     update_axes_work);
+	signed char x, y;
+
+	x = as5011_i2c_read(plat_dat->i2c_client, AS5011_X_RES_INT);
+	y = as5011_i2c_read(plat_dat->i2c_client, AS5011_Y_RES_INT);
+	input_report_abs(plat_dat->input_dev, ABS_X, x);
+	input_report_abs(plat_dat->input_dev, ABS_Y, y);
+	input_sync(plat_dat->input_dev);
+}
+
+static irqreturn_t as5011_int_interrupt(int irq, void *dev_id)
+{
+	struct as5011_platform_data *plat_dat =
+		(struct as5011_platform_data *)dev_id;
+
+	queue_work(plat_dat->workqueue, &plat_dat->update_axes_work);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * I2C bus operation
+ */
+
+static int as5011_i2c_write(struct i2c_client *client,
+			    uint8_t aRegAddr,
+			    uint8_t aValue)
+{
+	int ret;
+	uint8_t data[2] = { aRegAddr, aValue };
+	struct i2c_msg msg = {	client->addr,
+				I2C_M_IGNORE_NAK,
+				2,
+				(uint8_t *)data };
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		return -EINVAL;
+	return 1;
+}
+
+static signed char as5011_i2c_read(struct i2c_client *client,
+			   uint8_t aRegAddr)
+{
+	int ret;
+	uint8_t data[2];
+	struct i2c_msg msg_set[2];
+	struct i2c_msg msg1 = {	client->addr,
+				I2C_M_REV_DIR_ADDR,
+				1,
+				(uint8_t *)data};
+	struct i2c_msg msg2 = {	client->addr,
+				I2C_M_RD|I2C_M_NOSTART,
+				1,
+				(uint8_t *)data};
+
+	data[0] = aRegAddr;
+	msg_set[0] = msg1;
+	msg_set[1] = msg2;
+
+	ret = i2c_transfer(client->adapter, msg_set, 2);
+	if (ret < 0)
+		return -EINVAL;
+
+	if (data[0] & 0x80)
+		return -1*(1+(~data[0]));
+	else
+		return data[0];
+}
+
+static int as5011_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct as5011_platform_data *plat_dat = client->dev.platform_data;
+	int retval = 0;
+
+	plat_dat->num = g_num;
+	g_num++;
+
+	retval = snprintf(plat_dat->workqueue_name,
+			  SIZE_NAME,
+			  "as5011_%d_workqueue", plat_dat->num);
+	if (retval < 0) {
+		dev_err(&client->dev, "as5011: Failed to give workqueue name\n");
+		retval = -1;
+		goto workqueue_name_error;
+	}
+	plat_dat->workqueue =
+		create_singlethread_workqueue(plat_dat->workqueue_name);
+	if (plat_dat->workqueue == NULL) {
+		dev_err(&client->dev, "as5011: Failed to create workqueue\n");
+		retval = -EINVAL;
+		goto workqueue_create_error;
+	}
+
+	INIT_WORK(&plat_dat->update_axes_work, as5011_update_axes);
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_PROTOCOL_MANGLING)) {
+		dev_err(&client->dev,
+		"i2c bus does not support protocol mangling, as5011 can't work\n");
+		retval = -ENODEV;
+		goto i2c_protocol_error;
+	}
+	plat_dat->i2c_client = client;
+
+	plat_dat->input_dev = input_allocate_device();
+	if (plat_dat->input_dev < 0) {
+		dev_err(&client->dev,
+		"not enough memory for input devices structure\n");
+		retval = -ENOMEM;
+		goto input_allocate_device_error;
+	}
+
+	plat_dat->input_dev->name = "Austria Microsystem as5011 joystick";
+	plat_dat->input_dev->uniq = "Austria0";
+	plat_dat->input_dev->id.bustype = BUS_I2C;
+	plat_dat->input_dev->phys = "/dev/input/event0";
+	plat_dat->input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	plat_dat->input_dev->keybit[BIT_WORD(BTN_JOYSTICK)] =
+					BIT_MASK(BTN_JOYSTICK);
+
+	input_set_abs_params(plat_dat->input_dev,
+			     ABS_X,
+			     AS5011_MIN_AXIS,
+			     AS5011_MAX_AXIS,
+			     AS5011_FUZZ,
+			     AS5011_FLAT);
+	input_set_abs_params(plat_dat->input_dev,
+			     ABS_Y,
+			     AS5011_MIN_AXIS,
+			     AS5011_MAX_AXIS,
+			     AS5011_FUZZ,
+			     AS5011_FLAT);
+
+	plat_dat->button_irq_name =
+		kmalloc(sizeof(unsigned char)*SIZE_NAME,
+					 GFP_KERNEL);
+	if (plat_dat->button_irq_name == NULL) {
+		dev_err(&client->dev,
+		"not enough memory for input devices irq name\n");
+		retval = -ENOMEM;
+		goto input_allocate_device_name_error;
+	}
+
+
+	retval = snprintf(plat_dat->button_irq_name,
+			  SIZE_NAME,
+			  "as5011_%d_button",
+			  plat_dat->num);
+	if (retval < 0) {
+		dev_err(&client->dev, "as5011: Failed to give button irq name\n");
+		retval = -EINVAL;
+		goto button_irq_name_error;
+	}
+
+	if (request_irq(plat_dat->button_irq, button_interrupt,
+			0, plat_dat->button_irq_name, (void *)plat_dat)) {
+		dev_err(&client->dev, "as5011: Can't allocate irq %d\n",
+			plat_dat->button_irq);
+		retval = -EBUSY;
+		goto request_irq_error;
+	}
+
+	plat_dat->int_irq_name =
+		kmalloc(sizeof(unsigned char)*SIZE_NAME,
+					 GFP_KERNEL);
+	if (plat_dat->int_irq_name == NULL) {
+		dev_err(&client->dev,
+		"not enough memory for input devices int irq name\n");
+		retval = -ENOMEM;
+		goto input_allocate_int_device_name_error;
+	}
+
+	retval = snprintf(plat_dat->int_irq_name,
+			  SIZE_NAME,
+			  "as5011_%d_int",
+			  plat_dat->num);
+	if (retval < 0) {
+		dev_err(&client->dev, "as5011: Failed to give int irq name\n");
+		retval = -EINVAL;
+		goto int_irq_name_error;
+	}
+
+
+	if (request_irq(plat_dat->int_irq, as5011_int_interrupt,
+			0, plat_dat->int_irq_name, (void *)plat_dat)) {
+		dev_err(&client->dev, "as5011: Can't allocate int irq %d\n",
+			plat_dat->int_irq);
+		retval = -EBUSY;
+		goto request_int_irq_error;
+	}
+
+	retval = input_register_device(plat_dat->input_dev);
+	if (retval) {
+		dev_err(&client->dev, "as5011: Failed to register device\n");
+		retval = -EINVAL;
+		goto input_register_device_error;
+	}
+
+	retval = plat_dat->init_gpio();
+	if (retval < 0) {
+		dev_err(&client->dev, "as5011: Failed to init gpios\n");
+		retval = -EINVAL;
+		goto init_gpio_error;
+	}
+
+	/* chip soft reset */
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_CTRL1,
+				  AS5011_CTRL1_SOFT_RST);
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: soft reset failed\n");
+		retval = -EINVAL;
+		goto soft_reset_error;
+	}
+
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_CTRL1,
+				  AS5011_CTRL1_LP_PULSED |
+				  AS5011_CTRL1_LP_ACTIVE |
+				  AS5011_CTRL1_INT_ACT_EN
+				  );
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: power config failed\n");
+		retval = -EINVAL;
+		goto soft_reset_error;
+	}
+
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_CTRL2,
+				  AS5011_CTRL2_INV_SPINNING);
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: can't invert spinning\n");
+		retval = -EINVAL;
+		goto invert_spinning_error;
+	}
+
+	/* write threshold */
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_XP,
+				  plat_dat->Xp);
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: can't write threshold\n");
+		retval = -EINVAL;
+		goto threshold_error;
+	}
+
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_XN,
+				  plat_dat->Xn);
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: can't write threshold\n");
+		retval = -EINVAL;
+		goto threshold_error;
+	}
+
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_YP,
+				  plat_dat->Yp);
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: can't write threshold\n");
+		retval = -EINVAL;
+		goto threshold_error;
+	}
+
+	retval = as5011_i2c_write(plat_dat->i2c_client,
+				  AS5011_YN,
+				  plat_dat->Yn);
+	if (retval < 0) {
+		dev_err(&plat_dat->i2c_client->dev,
+			"as5011: can't write threshold\n");
+		retval = -EINVAL;
+		goto threshold_error;
+	}
+
+	/* to free irq gpio in chip*/
+	as5011_i2c_read(plat_dat->i2c_client, AS5011_X_RES_INT);
+
+	queue_work(plat_dat->workqueue, &plat_dat->update_axes_work);
+
+	return 0;
+
+	/* Error management */
+threshold_error:
+invert_spinning_error:
+soft_reset_error:
+	plat_dat->exit_gpio();
+init_gpio_error:
+	input_unregister_device(plat_dat->input_dev);
+input_register_device_error:
+	free_irq(plat_dat->int_irq, as5011_int_interrupt);
+request_int_irq_error:
+int_irq_name_error:
+	kfree(plat_dat->int_irq_name);
+input_allocate_int_device_name_error:
+	free_irq(plat_dat->button_irq, button_interrupt);
+request_irq_error:
+button_irq_name_error:
+	kfree(plat_dat->button_irq_name);
+input_allocate_device_name_error:
+	input_free_device(plat_dat->input_dev);
+input_allocate_device_error:
+i2c_protocol_error:
+	destroy_workqueue(plat_dat->workqueue);
+workqueue_create_error:
+workqueue_name_error:
+	return retval;
+}
+static int as5011_remove(struct i2c_client *client)
+{
+	struct as5011_platform_data *plat_dat = client->dev.platform_data;
+
+	destroy_workqueue(plat_dat->workqueue);
+	input_unregister_device(plat_dat->input_dev);
+	free_irq(plat_dat->button_irq, plat_dat);
+	free_irq(plat_dat->int_irq, plat_dat);
+	kfree(plat_dat->button_irq_name);
+	input_free_device(plat_dat->input_dev);
+	plat_dat->exit_gpio();
+
+	return 0;
+}
+static const struct i2c_device_id as5011_id[] = {
+	{ "as5011", 0 },
+	{ }
+};
+
+static struct i2c_driver as5011_driver = {
+	.driver = {
+		.name = "as5011",
+	},
+	.probe		= as5011_probe,
+	.remove		= as5011_remove,
+	.id_table	= as5011_id,
+};
+
+/*
+ * Module initialization
+ */
+
+static int __init as5011_init(void)
+{
+	return i2c_add_driver(&as5011_driver);
+}
+
+static void __exit as5011_exit(void)
+{
+	i2c_del_driver(&as5011_driver);
+}
+
+module_init(as5011_init);
+module_exit(as5011_exit);
diff --git a/include/linux/as5011.h b/include/linux/as5011.h
new file mode 100644
index 0000000..7db0a75
--- /dev/null
+++ b/include/linux/as5011.h
@@ -0,0 +1,72 @@
+#ifndef _AS5011_H
+#define _AS5011_H
+
+/*
+ * Copyright (c) 2010 Fabien Marteau
+ *
+ * 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.
+ */
+
+#define AS5011_MAX_NAME_LENGTH	64
+#define AS5011_MAX_CNAME_LENGTH	16
+#define AS5011_MAX_PHYS_LENGTH	64
+#define AS5011_MAX_LENGTH	64
+
+/* 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
+
+
+struct as5011_platform_data {
+	/* public */
+	int button_gpio;
+	int button_irq;
+	int int_gpio;
+	int int_irq;
+	char Xp, Xn; /* threshold for x axis */
+	char Yp, Yn; /* threshold for y axis */
+
+	int (*init_gpio)(void); /* init interrupts gpios */
+	void (*exit_gpio)(void);/* exit gpios */
+
+	/* private */
+	int num;
+	struct input_dev *input_dev;
+	struct i2c_client *i2c_client;
+	unsigned char *button_irq_name;
+	unsigned char *int_irq_name;
+	char name[AS5011_MAX_NAME_LENGTH];
+	char cname[AS5011_MAX_CNAME_LENGTH];
+	char phys[AS5011_MAX_PHYS_LENGTH];
+	unsigned char data[AS5011_MAX_LENGTH];
+	char workqueue_name[AS5011_MAX_NAME_LENGTH];
+	struct workqueue_struct *workqueue;
+	struct work_struct update_axes_work;
+};
+
+#endif /* _AS5011_H */
-- 
1.7.0.4

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