forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
359 lines
8.4 KiB
359 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (c) 2010, 2011 Fabien Marteau <[email protected]> |
|
* Sponsored by ARMadeus Systems |
|
* |
|
* 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 <[email protected]>"); |
|
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);
|
|
|