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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Oleh Kravchenko <oleg@kaa.org.ua>
*
* SparkFun Qwiic Joystick
* Product page:https://www.sparkfun.com/products/15168
* Firmware and hardware sources:https://github.com/sparkfun/Qwiic_Joystick
*/
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
#define DRV_NAME "qwiic-joystick"
#define QWIIC_JSK_REG_VERS 1
#define QWIIC_JSK_REG_DATA 3
#define QWIIC_JSK_MAX_AXIS GENMASK(9, 0)
#define QWIIC_JSK_FUZZ 2
#define QWIIC_JSK_FLAT 2
#define QWIIC_JSK_POLL_INTERVAL 16
#define QWIIC_JSK_POLL_MIN 8
#define QWIIC_JSK_POLL_MAX 32
struct qwiic_jsk {
char phys[32];
struct input_dev *dev;
struct i2c_client *client;
};
struct qwiic_ver {
u8 major;
u8 minor;
};
struct qwiic_data {
__be16 x;
__be16 y;
u8 thumb;
};
static void qwiic_poll(struct input_dev *input)
{
struct qwiic_jsk *priv = input_get_drvdata(input);
struct qwiic_data data;
int err;
err = i2c_smbus_read_i2c_block_data(priv->client, QWIIC_JSK_REG_DATA,
sizeof(data), (u8 *)&data);
if (err != sizeof(data))
return;
input_report_abs(input, ABS_X, be16_to_cpu(data.x) >> 6);
input_report_abs(input, ABS_Y, be16_to_cpu(data.y) >> 6);
input_report_key(input, BTN_THUMBL, !data.thumb);
input_sync(input);
}
static int qwiic_probe(struct i2c_client *client)
{
struct qwiic_jsk *priv;
struct qwiic_ver vers;
int err;
err = i2c_smbus_read_i2c_block_data(client, QWIIC_JSK_REG_VERS,
sizeof(vers), (u8 *)&vers);
if (err < 0)
return err;
if (err != sizeof(vers))
return -EIO;
dev_dbg(&client->dev, "SparkFun Qwiic Joystick, FW: %u.%u\n",
vers.major, vers.minor);
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client = client;
snprintf(priv->phys, sizeof(priv->phys),
"i2c/%s", dev_name(&client->dev));
i2c_set_clientdata(client, priv);
priv->dev = devm_input_allocate_device(&client->dev);
if (!priv->dev)
return -ENOMEM;
priv->dev->id.bustype = BUS_I2C;
priv->dev->name = "SparkFun Qwiic Joystick";
priv->dev->phys = priv->phys;
input_set_drvdata(priv->dev, priv);
input_set_abs_params(priv->dev, ABS_X, 0, QWIIC_JSK_MAX_AXIS,
QWIIC_JSK_FUZZ, QWIIC_JSK_FLAT);
input_set_abs_params(priv->dev, ABS_Y, 0, QWIIC_JSK_MAX_AXIS,
QWIIC_JSK_FUZZ, QWIIC_JSK_FLAT);
input_set_capability(priv->dev, EV_KEY, BTN_THUMBL);
err = input_setup_polling(priv->dev, qwiic_poll);
if (err) {
dev_err(&client->dev, "failed to set up polling: %d\n", err);
return err;
}
input_set_poll_interval(priv->dev, QWIIC_JSK_POLL_INTERVAL);
input_set_min_poll_interval(priv->dev, QWIIC_JSK_POLL_MIN);
input_set_max_poll_interval(priv->dev, QWIIC_JSK_POLL_MAX);
err = input_register_device(priv->dev);
if (err) {
dev_err(&client->dev, "failed to register joystick: %d\n", err);
return err;
}
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id of_qwiic_match[] = {
{ .compatible = "sparkfun,qwiic-joystick", },
{ },
};
MODULE_DEVICE_TABLE(of, of_qwiic_match);
#endif /* CONFIG_OF */
static const struct i2c_device_id qwiic_id_table[] = {
{ KBUILD_MODNAME, 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, qwiic_id_table);
static struct i2c_driver qwiic_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(of_qwiic_match),
},
.id_table = qwiic_id_table,
.probe = qwiic_probe,
};
module_i2c_driver(qwiic_driver);
MODULE_AUTHOR("Oleh Kravchenko <oleg@kaa.org.ua>");
MODULE_DESCRIPTION("SparkFun Qwiic Joystick driver");
MODULE_LICENSE("GPL v2");
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