136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Raspberry Pi Sense HAT joystick driver
|
|
* http://raspberrypi.org
|
|
*
|
|
* Copyright (C) 2015 Raspberry Pi
|
|
* Copyright (C) 2021 Charles Mirabile, Mwesigwa Guma, Joel Savitz
|
|
*
|
|
* Original Author: Serge Schneider
|
|
* Revised for upstream Linux by: Charles Mirabile, Mwesigwa Guma, Joel Savitz
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/input.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/property.h>
|
|
|
|
#define JOYSTICK_SMB_REG 0xf2
|
|
|
|
struct sensehat_joystick {
|
|
struct platform_device *pdev;
|
|
struct input_dev *keys_dev;
|
|
unsigned long prev_states;
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
static const unsigned int keymap[] = {
|
|
BTN_DPAD_DOWN, BTN_DPAD_RIGHT, BTN_DPAD_UP, BTN_SELECT, BTN_DPAD_LEFT,
|
|
};
|
|
|
|
static irqreturn_t sensehat_joystick_report(int irq, void *cookie)
|
|
{
|
|
struct sensehat_joystick *sensehat_joystick = cookie;
|
|
unsigned long curr_states, changes;
|
|
unsigned int keys;
|
|
int error;
|
|
int i;
|
|
|
|
error = regmap_read(sensehat_joystick->regmap, JOYSTICK_SMB_REG, &keys);
|
|
if (error < 0) {
|
|
dev_err(&sensehat_joystick->pdev->dev,
|
|
"Failed to read joystick state: %d", error);
|
|
return IRQ_NONE;
|
|
}
|
|
curr_states = keys;
|
|
bitmap_xor(&changes, &curr_states, &sensehat_joystick->prev_states,
|
|
ARRAY_SIZE(keymap));
|
|
|
|
for_each_set_bit(i, &changes, ARRAY_SIZE(keymap))
|
|
input_report_key(sensehat_joystick->keys_dev, keymap[i],
|
|
curr_states & BIT(i));
|
|
|
|
input_sync(sensehat_joystick->keys_dev);
|
|
sensehat_joystick->prev_states = keys;
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int sensehat_joystick_probe(struct platform_device *pdev)
|
|
{
|
|
struct sensehat_joystick *sensehat_joystick;
|
|
int error, i, irq;
|
|
|
|
sensehat_joystick = devm_kzalloc(&pdev->dev, sizeof(*sensehat_joystick),
|
|
GFP_KERNEL);
|
|
if (!sensehat_joystick)
|
|
return -ENOMEM;
|
|
|
|
sensehat_joystick->pdev = pdev;
|
|
|
|
sensehat_joystick->regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
|
if (!sensehat_joystick->regmap) {
|
|
dev_err(&pdev->dev, "unable to get sensehat regmap");
|
|
return -ENODEV;
|
|
}
|
|
|
|
sensehat_joystick->keys_dev = devm_input_allocate_device(&pdev->dev);
|
|
if (!sensehat_joystick->keys_dev) {
|
|
dev_err(&pdev->dev, "Could not allocate input device");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sensehat_joystick->keys_dev->name = "Raspberry Pi Sense HAT Joystick";
|
|
sensehat_joystick->keys_dev->phys = "sensehat-joystick/input0";
|
|
sensehat_joystick->keys_dev->id.bustype = BUS_I2C;
|
|
|
|
__set_bit(EV_KEY, sensehat_joystick->keys_dev->evbit);
|
|
__set_bit(EV_REP, sensehat_joystick->keys_dev->evbit);
|
|
for (i = 0; i < ARRAY_SIZE(keymap); i++)
|
|
__set_bit(keymap[i], sensehat_joystick->keys_dev->keybit);
|
|
|
|
error = input_register_device(sensehat_joystick->keys_dev);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "Could not register input device");
|
|
return error;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
error = devm_request_threaded_irq(&pdev->dev, irq,
|
|
NULL, sensehat_joystick_report,
|
|
IRQF_ONESHOT, "keys",
|
|
sensehat_joystick);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "IRQ request failed");
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sensehat_joystick_device_id[] = {
|
|
{ .compatible = "raspberrypi,sensehat-joystick" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sensehat_joystick_device_id);
|
|
|
|
static struct platform_driver sensehat_joystick_driver = {
|
|
.probe = sensehat_joystick_probe,
|
|
.driver = {
|
|
.name = "sensehat-joystick",
|
|
.of_match_table = sensehat_joystick_device_id,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(sensehat_joystick_driver);
|
|
|
|
MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver");
|
|
MODULE_AUTHOR("Charles Mirabile <cmirabil@redhat.com>");
|
|
MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
|
|
MODULE_LICENSE("GPL");
|