Input: add Austria Microsystem AS5011 joystick driver
This is driver for EasyPoint AS5011 2 axis joystick chip. This chip is plugged on an I2C bus. Tested on ARM processor (i.MX27). Signed-off-by: Fabien Marteau <fabien.marteau@armadeus.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Fabien Marteau
Dmitry Torokhov
parent
048fc018c8
commit
9d084a3d5d
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@ -255,6 +255,16 @@ config JOYSTICK_AMIGA
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To compile this driver as a module, choose M here: the
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module will be called amijoy.
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config JOYSTICK_AS5011
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tristate "Austria Microsystem AS5011 joystick"
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depends on I2C
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help
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Say Y here if you have an AS5011 digital joystick connected to your
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system.
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To compile this driver as a module, choose M here: the
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module will be called as5011.
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config JOYSTICK_JOYDUMP
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tristate "Gameport data dumper"
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select GAMEPORT
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@ -7,6 +7,7 @@
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obj-$(CONFIG_JOYSTICK_A3D) += a3d.o
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obj-$(CONFIG_JOYSTICK_ADI) += adi.o
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obj-$(CONFIG_JOYSTICK_AMIGA) += amijoy.o
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obj-$(CONFIG_JOYSTICK_AS5011) += as5011.o
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obj-$(CONFIG_JOYSTICK_ANALOG) += analog.o
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obj-$(CONFIG_JOYSTICK_COBRA) += cobra.o
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obj-$(CONFIG_JOYSTICK_DB9) += db9.o
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@ -0,0 +1,367 @@
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/*
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* Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
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* Sponsored by ARMadeus Systems
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Driver for Austria Microsystems joysticks AS5011
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*
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* TODO:
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* - Power on the chip when open() and power down when close()
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* - Manage power mode
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/input/as5011.h>
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#include <linux/slab.h>
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#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
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#define MODULE_DEVICE_ALIAS "as5011"
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MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/* registers */
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#define AS5011_CTRL1 0x76
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#define AS5011_CTRL2 0x75
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#define AS5011_XP 0x43
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#define AS5011_XN 0x44
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#define AS5011_YP 0x53
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#define AS5011_YN 0x54
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#define AS5011_X_REG 0x41
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#define AS5011_Y_REG 0x42
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#define AS5011_X_RES_INT 0x51
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#define AS5011_Y_RES_INT 0x52
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/* CTRL1 bits */
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#define AS5011_CTRL1_LP_PULSED 0x80
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#define AS5011_CTRL1_LP_ACTIVE 0x40
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#define AS5011_CTRL1_LP_CONTINUE 0x20
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#define AS5011_CTRL1_INT_WUP_EN 0x10
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#define AS5011_CTRL1_INT_ACT_EN 0x08
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#define AS5011_CTRL1_EXT_CLK_EN 0x04
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#define AS5011_CTRL1_SOFT_RST 0x02
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#define AS5011_CTRL1_DATA_VALID 0x01
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/* CTRL2 bits */
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#define AS5011_CTRL2_EXT_SAMPLE_EN 0x08
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#define AS5011_CTRL2_RC_BIAS_ON 0x04
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#define AS5011_CTRL2_INV_SPINNING 0x02
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#define AS5011_MAX_AXIS 80
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#define AS5011_MIN_AXIS (-80)
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#define AS5011_FUZZ 8
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#define AS5011_FLAT 40
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struct as5011_device {
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struct input_dev *input_dev;
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struct i2c_client *i2c_client;
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unsigned int button_gpio;
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unsigned int button_irq;
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unsigned int axis_irq;
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};
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static int as5011_i2c_write(struct i2c_client *client,
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uint8_t aregaddr,
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uint8_t avalue)
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{
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uint8_t data[2] = { aregaddr, avalue };
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struct i2c_msg msg = {
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client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data
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};
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int error;
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error = i2c_transfer(client->adapter, &msg, 1);
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return error < 0 ? error : 0;
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}
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static int as5011_i2c_read(struct i2c_client *client,
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uint8_t aregaddr, signed char *value)
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{
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uint8_t data[2] = { aregaddr };
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struct i2c_msg msg_set[2] = {
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{ client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data },
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{ client->addr, I2C_M_RD | I2C_M_NOSTART, 1, (uint8_t *)data }
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};
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int error;
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error = i2c_transfer(client->adapter, msg_set, 2);
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if (error < 0)
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return error;
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*value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0];
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return 0;
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}
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static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
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{
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struct as5011_device *as5011 = dev_id;
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int val = gpio_get_value_cansleep(as5011->button_gpio);
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input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
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input_sync(as5011->input_dev);
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return IRQ_HANDLED;
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}
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static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
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{
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struct as5011_device *as5011 = dev_id;
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int error;
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signed char x, y;
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error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
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if (error < 0)
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goto out;
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error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
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if (error < 0)
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goto out;
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input_report_abs(as5011->input_dev, ABS_X, x);
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input_report_abs(as5011->input_dev, ABS_Y, y);
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input_sync(as5011->input_dev);
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out:
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return IRQ_HANDLED;
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}
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static int __devinit as5011_configure_chip(struct as5011_device *as5011,
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const struct as5011_platform_data *plat_dat)
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{
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struct i2c_client *client = as5011->i2c_client;
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int error;
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signed char value;
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/* chip soft reset */
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error = as5011_i2c_write(client, AS5011_CTRL1,
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AS5011_CTRL1_SOFT_RST);
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if (error < 0) {
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dev_err(&client->dev, "Soft reset failed\n");
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return error;
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}
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mdelay(10);
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error = as5011_i2c_write(client, AS5011_CTRL1,
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AS5011_CTRL1_LP_PULSED |
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AS5011_CTRL1_LP_ACTIVE |
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AS5011_CTRL1_INT_ACT_EN);
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if (error < 0) {
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dev_err(&client->dev, "Power config failed\n");
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return error;
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}
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error = as5011_i2c_write(client, AS5011_CTRL2,
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AS5011_CTRL2_INV_SPINNING);
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if (error < 0) {
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dev_err(&client->dev, "Can't invert spinning\n");
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return error;
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}
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/* write threshold */
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error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
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if (error < 0) {
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dev_err(&client->dev, "Can't write threshold\n");
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return error;
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}
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error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
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if (error < 0) {
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dev_err(&client->dev, "Can't write threshold\n");
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return error;
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}
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error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
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if (error < 0) {
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dev_err(&client->dev, "Can't write threshold\n");
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return error;
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}
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error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
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if (error < 0) {
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dev_err(&client->dev, "Can't write threshold\n");
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return error;
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}
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/* to free irq gpio in chip */
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error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
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if (error < 0) {
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dev_err(&client->dev, "Can't read i2c X resolution value\n");
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return error;
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}
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return 0;
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}
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static int __devinit as5011_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct as5011_platform_data *plat_data;
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struct as5011_device *as5011;
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struct input_dev *input_dev;
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int irq;
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int error;
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plat_data = client->dev.platform_data;
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if (!plat_data)
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return -EINVAL;
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if (!plat_data->axis_irq) {
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dev_err(&client->dev, "No axis IRQ?\n");
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return -EINVAL;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_PROTOCOL_MANGLING)) {
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dev_err(&client->dev,
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"need i2c bus that supports protocol mangling\n");
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return -ENODEV;
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}
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as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!as5011 || !input_dev) {
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dev_err(&client->dev,
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"Can't allocate memory for device structure\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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as5011->i2c_client = client;
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as5011->input_dev = input_dev;
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as5011->button_gpio = plat_data->button_gpio;
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as5011->axis_irq = plat_data->axis_irq;
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input_dev->name = "Austria Microsystem as5011 joystick";
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input_dev->id.bustype = BUS_I2C;
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input_dev->dev.parent = &client->dev;
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(EV_ABS, input_dev->evbit);
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__set_bit(BTN_JOYSTICK, input_dev->keybit);
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input_set_abs_params(input_dev, ABS_X,
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AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
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input_set_abs_params(as5011->input_dev, ABS_Y,
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AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
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error = gpio_request(as5011->button_gpio, "AS5011 button");
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if (error < 0) {
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dev_err(&client->dev, "Failed to request button gpio\n");
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goto err_free_mem;
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}
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irq = gpio_to_irq(as5011->button_gpio);
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if (irq < 0) {
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dev_err(&client->dev,
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"Failed to get irq number for button gpio\n");
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goto err_free_button_gpio;
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}
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as5011->button_irq = irq;
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error = request_threaded_irq(as5011->button_irq,
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NULL, as5011_button_interrupt,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"as5011_button", as5011);
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if (error < 0) {
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dev_err(&client->dev,
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"Can't allocate button irq %d\n", as5011->button_irq);
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goto err_free_button_gpio;
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}
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error = as5011_configure_chip(as5011, plat_data);
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if (error)
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goto err_free_button_irq;
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error = request_threaded_irq(as5011->axis_irq, NULL,
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as5011_axis_interrupt,
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plat_data->axis_irqflags,
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"as5011_joystick", as5011);
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if (error) {
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dev_err(&client->dev,
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"Can't allocate axis irq %d\n", plat_data->axis_irq);
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goto err_free_button_irq;
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}
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error = input_register_device(as5011->input_dev);
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if (error) {
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dev_err(&client->dev, "Failed to register input device\n");
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goto err_free_axis_irq;
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}
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i2c_set_clientdata(client, as5011);
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return 0;
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err_free_axis_irq:
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free_irq(as5011->axis_irq, as5011);
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err_free_button_irq:
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free_irq(as5011->button_irq, as5011);
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err_free_button_gpio:
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gpio_free(as5011->button_gpio);
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err_free_mem:
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input_free_device(input_dev);
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kfree(as5011);
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return error;
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}
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static int __devexit as5011_remove(struct i2c_client *client)
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{
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struct as5011_device *as5011 = i2c_get_clientdata(client);
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free_irq(as5011->axis_irq, as5011);
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free_irq(as5011->button_irq, as5011);
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gpio_free(as5011->button_gpio);
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input_unregister_device(as5011->input_dev);
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kfree(as5011);
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return 0;
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}
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static const struct i2c_device_id as5011_id[] = {
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{ MODULE_DEVICE_ALIAS, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, as5011_id);
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static struct i2c_driver as5011_driver = {
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.driver = {
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.name = "as5011",
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},
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.probe = as5011_probe,
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.remove = __devexit_p(as5011_remove),
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.id_table = as5011_id,
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};
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static int __init as5011_init(void)
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{
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return i2c_add_driver(&as5011_driver);
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}
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module_init(as5011_init);
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static void __exit as5011_exit(void)
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{
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i2c_del_driver(&as5011_driver);
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}
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module_exit(as5011_exit);
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@ -0,0 +1,20 @@
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#ifndef _AS5011_H
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#define _AS5011_H
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/*
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* Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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struct as5011_platform_data {
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unsigned int button_gpio;
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unsigned int axis_irq; /* irq number */
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unsigned long axis_irqflags;
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char xp, xn; /* threshold for x axis */
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char yp, yn; /* threshold for y axis */
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};
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#endif /* _AS5011_H */
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