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Message-ID: <4D27735C.6000105@armadeus.com>
Date: Fri, 07 Jan 2011 21:11:08 +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 (fourth version)
Driver for EasyPoint AS5011 2 axis joystick chip. This chip is plugged on an I2C bus.
It has 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 | 414 +++++++++++++++++++++++++++++++++++++++
include/linux/input/as5011.h | 24 +++
4 files changed, 448 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/joystick/as5011.c
create mode 100644 include/linux/input/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..d42e74b
--- /dev/null
+++ b/drivers/input/joystick/as5011.c
@@ -0,0 +1,414 @@
+/*
+ * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@...adeus.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/mutex.h>
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/input/as5011.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+
+#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
+#define MODULE_DEVICE_ALIAS "as5011"
+
+MODULE_AUTHOR("Fabien Marteau <fabien.marteau@...adeus.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 {
+ int button_irq;
+ struct input_dev *input_dev;
+ struct i2c_client *i2c_client;
+ char name[AS5011_MAX_NAME_LENGTH];
+};
+
+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 ret;
+
+ return 0;
+}
+
+static int as5011_i2c_read(struct i2c_client *client,
+ uint8_t aregaddr, signed char *value)
+{
+ 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 ret;
+
+ if (data[0] & 0x80) {
+ *value = -1*(1+(~data[0]));
+ return 0;
+ } else {
+ *value = data[0];
+ return 0;
+ }
+}
+
+static irqreturn_t button_interrupt(int irq, void *dev_id)
+{
+ struct as5011_device *dev = dev_id;
+ struct as5011_platform_data *plat_dat =
+ dev->i2c_client->dev.platform_data;
+ int ret;
+
+ ret = gpio_get_value(plat_dat->button_gpio);
+ if (ret)
+ input_report_key(dev->input_dev, BTN_JOYSTICK, 0);
+ else
+ input_report_key(dev->input_dev, BTN_JOYSTICK, 1);
+ input_sync(dev->input_dev);
+
+ return IRQ_HANDLED;
+}
+
+static int as5011_update_axes(struct as5011_device *dev)
+{
+ int ret;
+ signed char x, y;
+
+ ret = as5011_i2c_read(dev->i2c_client, AS5011_X_RES_INT, &x);
+ if (ret < 0)
+ return ret;
+ ret = as5011_i2c_read(dev->i2c_client, AS5011_Y_RES_INT, &y);
+ if (ret < 0)
+ return ret;
+ input_report_abs(dev->input_dev, ABS_X, x);
+ input_report_abs(dev->input_dev, ABS_Y, y);
+ input_sync(dev->input_dev);
+ return 0;
+}
+
+static irqreturn_t as5011_int_interrupt(int irq, void *dev_id)
+{
+ int ret;
+ struct as5011_device *dev = dev_id;
+
+ ret = as5011_update_axes(dev);
+ if (ret < 0)
+ return ret;
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit as5011_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct as5011_device *dev;
+ struct as5011_platform_data *plat_dat = client->dev.platform_data;
+ int retval = 0;
+ signed char value;
+
+ if (plat_dat == NULL)
+ return -EINVAL;
+
+ dev = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err(&client->dev,
+ "Can't allocate memory for device structure\n");
+ goto err_out;
+ }
+
+ 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 err_free_device_structure;
+ }
+ dev->i2c_client = client;
+
+ dev->input_dev = input_allocate_device();
+ if (dev->input_dev == NULL) {
+ dev_err(&client->dev,
+ "not enough memory for input devices structure\n");
+ retval = -ENOMEM;
+ goto err_free_device_structure;
+ }
+
+ dev->input_dev->name = "Austria Microsystem as5011 joystick";
+ dev->input_dev->id.bustype = BUS_I2C;
+ __set_bit(EV_KEY, dev->input_dev->evbit);
+ __set_bit(EV_ABS, dev->input_dev->evbit);
+ __set_bit(BTN_JOYSTICK, dev->input_dev->keybit);
+
+ input_set_abs_params(dev->input_dev,
+ ABS_X,
+ AS5011_MIN_AXIS,
+ AS5011_MAX_AXIS,
+ AS5011_FUZZ,
+ AS5011_FLAT);
+ input_set_abs_params(dev->input_dev,
+ ABS_Y,
+ AS5011_MIN_AXIS,
+ AS5011_MAX_AXIS,
+ AS5011_FUZZ,
+ AS5011_FLAT);
+
+ retval = gpio_request(plat_dat->button_gpio, "AS5011 button");
+ if (retval < 0) {
+ dev_err(&client->dev, "Failed to request button gpio\n");
+ goto err_input_free_device;
+ }
+
+
+ dev->button_irq = gpio_to_irq(plat_dat->button_gpio);
+ if (dev->button_irq < 0) {
+ dev_err(&client->dev,
+ "Failed to get irq number for button gpio\n");
+ goto err_free_button_gpio;
+ }
+
+ set_irq_type(dev->button_irq, IRQ_TYPE_EDGE_BOTH);
+
+ retval = request_threaded_irq(dev->button_irq,
+ NULL, button_interrupt,
+ 0, "as5011_button",
+ dev);
+ if (retval < 0) {
+ dev_err(&client->dev, "Can't allocate irq %d\n",
+ dev->button_irq);
+ goto err_free_button_gpio;
+ }
+
+ /* chip soft reset */
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_CTRL1,
+ AS5011_CTRL1_SOFT_RST);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Soft reset failed\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ mdelay(10);
+
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_CTRL1,
+ AS5011_CTRL1_LP_PULSED |
+ AS5011_CTRL1_LP_ACTIVE |
+ AS5011_CTRL1_INT_ACT_EN
+ );
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Power config failed\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_CTRL2,
+ AS5011_CTRL2_INV_SPINNING);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Can't invert spinning\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ /* write threshold */
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_XP,
+ plat_dat->xp);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Can't write threshold\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_XN,
+ plat_dat->xn);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Can't write threshold\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_YP,
+ plat_dat->yp);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Can't write threshold\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ retval = as5011_i2c_write(dev->i2c_client,
+ AS5011_YN,
+ plat_dat->yn);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Can't write threshold\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ /* request irq */
+
+ /* to free irq gpio in chip*/
+ retval = as5011_i2c_read(dev->i2c_client, AS5011_X_RES_INT, &value);
+ if (retval < 0) {
+ dev_err(&dev->i2c_client->dev,
+ "Can't read i2c X resolution value\n");
+ goto err_free_irq_button_interrupt;
+ }
+
+ set_irq_type(plat_dat->int_irq, plat_dat->int_edge);
+
+ if (request_threaded_irq(plat_dat->int_irq, NULL,
+ as5011_int_interrupt,
+ 0, "as5011_joystick", dev)) {
+ dev_err(&client->dev, "Can't allocate int irq %d\n",
+ plat_dat->int_irq);
+ goto err_free_irq_button_interrupt;
+ }
+
+ retval = input_register_device(dev->input_dev);
+ if (retval) {
+ dev_err(&client->dev, "Failed to register device\n");
+ goto err_free_irq_int;
+ }
+ i2c_set_clientdata(client, dev);
+
+ return 0;
+
+ /* Error management */
+err_free_irq_int:
+ set_irq_type(plat_dat->int_irq, IRQ_TYPE_NONE);
+ free_irq(plat_dat->int_irq, dev);
+err_free_irq_button_interrupt:
+ set_irq_type(dev->button_irq, IRQ_TYPE_NONE);
+ free_irq(dev->button_irq, dev);
+err_free_button_gpio:
+ gpio_free(plat_dat->button_gpio);
+err_input_free_device:
+ input_unregister_device(dev->input_dev);
+err_free_device_structure:
+ kfree(dev);
+err_out:
+ return retval;
+}
+static int as5011_remove(struct i2c_client *client)
+{
+ struct as5011_device *dev;
+ struct as5011_platform_data *plat_dat = client->dev.platform_data;
+
+ dev = i2c_get_clientdata(client);
+
+ set_irq_type(plat_dat->int_irq, IRQ_TYPE_NONE);
+ free_irq(plat_dat->int_irq, dev);
+ set_irq_type(dev->button_irq, IRQ_TYPE_NONE);
+ free_irq(dev->button_irq, dev);
+ gpio_free(plat_dat->button_gpio);
+ input_unregister_device(dev->input_dev);
+ kfree(dev);
+ return 0;
+}
+static const struct i2c_device_id as5011_id[] = {
+ { MODULE_DEVICE_ALIAS, 0 },
+ { }
+};
+
+static struct i2c_driver as5011_driver = {
+ .driver = {
+ .name = "as5011",
+ },
+ .probe = as5011_probe,
+ .remove = __devexit_p(as5011_remove),
+ .id_table = as5011_id,
+};
+
+static int __init as5011_init(void)
+{
+ return i2c_add_driver(&as5011_driver);
+}
+module_init(as5011_init);
+
+static void __exit as5011_exit(void)
+{
+ i2c_del_driver(&as5011_driver);
+}
+module_exit(as5011_exit);
+
diff --git a/include/linux/input/as5011.h b/include/linux/input/as5011.h
new file mode 100644
index 0000000..250b7bf
--- /dev/null
+++ b/include/linux/input/as5011.h
@@ -0,0 +1,24 @@
+#ifndef _AS5011_H
+#define _AS5011_H
+
+/*
+ * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@...adeus.com>
+ *
+ * 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/mutex.h>
+
+#define AS5011_MAX_NAME_LENGTH 64
+
+struct as5011_platform_data {
+ int button_gpio;
+ int int_irq; /* irq number */
+ int int_edge;/* irq edge IRQ_TYPE_EDGE_[FALLING,RISING,BOTH] */
+ char xp, xn; /* threshold for x axis */
+ char yp, yn; /* threshold for y axis */
+};
+
+#endif /* _AS5011_H */
--
1.7.0.4
--
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