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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 BayLibre SAS
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
//
// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77650.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define MAX77650_ONKEY_MODE_MASK BIT(3)
#define MAX77650_ONKEY_MODE_PUSH 0x00
#define MAX77650_ONKEY_MODE_SLIDE BIT(3)
struct max77650_onkey {
struct input_dev *input;
unsigned int code;
};
static irqreturn_t max77650_onkey_falling(int irq, void *data)
{
struct max77650_onkey *onkey = data;
input_report_key(onkey->input, onkey->code, 0);
input_sync(onkey->input);
return IRQ_HANDLED;
}
static irqreturn_t max77650_onkey_rising(int irq, void *data)
{
struct max77650_onkey *onkey = data;
input_report_key(onkey->input, onkey->code, 1);
input_sync(onkey->input);
return IRQ_HANDLED;
}
static int max77650_onkey_probe(struct platform_device *pdev)
{
int irq_r, irq_f, error, mode;
struct max77650_onkey *onkey;
struct device *dev, *parent;
struct regmap *map;
unsigned int type;
dev = &pdev->dev;
parent = dev->parent;
map = dev_get_regmap(parent, NULL);
if (!map)
return -ENODEV;
onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
if (!onkey)
return -ENOMEM;
error = device_property_read_u32(dev, "linux,code", &onkey->code);
if (error)
onkey->code = KEY_POWER;
if (device_property_read_bool(dev, "maxim,onkey-slide")) {
mode = MAX77650_ONKEY_MODE_SLIDE;
type = EV_SW;
} else {
mode = MAX77650_ONKEY_MODE_PUSH;
type = EV_KEY;
}
error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
MAX77650_ONKEY_MODE_MASK, mode);
if (error)
return error;
irq_f = platform_get_irq_byname(pdev, "nEN_F");
if (irq_f < 0)
return irq_f;
irq_r = platform_get_irq_byname(pdev, "nEN_R");
if (irq_r < 0)
return irq_r;
onkey->input = devm_input_allocate_device(dev);
if (!onkey->input)
return -ENOMEM;
onkey->input->name = "max77650_onkey";
onkey->input->phys = "max77650_onkey/input0";
onkey->input->id.bustype = BUS_I2C;
input_set_capability(onkey->input, type, onkey->code);
error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
IRQF_ONESHOT, "onkey-down", onkey);
if (error < 0)
return error;
error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
IRQF_ONESHOT, "onkey-up", onkey);
if (error < 0)
return error;
return input_register_device(onkey->input);
}
static struct platform_driver max77650_onkey_driver = {
.driver = {
.name = "max77650-onkey",
},
.probe = max77650_onkey_probe,
};
module_platform_driver(max77650_onkey_driver);
MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
MODULE_LICENSE("GPL v2");
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