diff options
Diffstat (limited to 'drivers/input/joystick/as5011.c')
-rw-r--r-- | drivers/input/joystick/as5011.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/drivers/input/joystick/as5011.c b/drivers/input/joystick/as5011.c new file mode 100644 index 000000000..2beda2902 --- /dev/null +++ b/drivers/input/joystick/as5011.c @@ -0,0 +1,357 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com> + * 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 <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 void 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); +} + +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); |