// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 BayLibre SAS
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// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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//
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// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/max77650.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define MAX77650_ONKEY_MODE_MASK BIT(3)
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#define MAX77650_ONKEY_MODE_PUSH 0x00
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#define MAX77650_ONKEY_MODE_SLIDE BIT(3)
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struct max77650_onkey {
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struct input_dev *input;
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unsigned int code;
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};
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static irqreturn_t max77650_onkey_falling(int irq, void *data)
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{
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struct max77650_onkey *onkey = data;
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input_report_key(onkey->input, onkey->code, 0);
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input_sync(onkey->input);
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return IRQ_HANDLED;
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}
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static irqreturn_t max77650_onkey_rising(int irq, void *data)
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{
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struct max77650_onkey *onkey = data;
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input_report_key(onkey->input, onkey->code, 1);
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input_sync(onkey->input);
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return IRQ_HANDLED;
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}
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static int max77650_onkey_probe(struct platform_device *pdev)
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{
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int irq_r, irq_f, error, mode;
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struct max77650_onkey *onkey;
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struct device *dev, *parent;
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struct regmap *map;
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unsigned int type;
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dev = &pdev->dev;
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parent = dev->parent;
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map = dev_get_regmap(parent, NULL);
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if (!map)
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return -ENODEV;
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onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
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if (!onkey)
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return -ENOMEM;
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error = device_property_read_u32(dev, "linux,code", &onkey->code);
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if (error)
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onkey->code = KEY_POWER;
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if (device_property_read_bool(dev, "maxim,onkey-slide")) {
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mode = MAX77650_ONKEY_MODE_SLIDE;
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type = EV_SW;
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} else {
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mode = MAX77650_ONKEY_MODE_PUSH;
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type = EV_KEY;
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}
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error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
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MAX77650_ONKEY_MODE_MASK, mode);
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if (error)
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return error;
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irq_f = platform_get_irq_byname(pdev, "nEN_F");
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if (irq_f < 0)
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return irq_f;
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irq_r = platform_get_irq_byname(pdev, "nEN_R");
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if (irq_r < 0)
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return irq_r;
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onkey->input = devm_input_allocate_device(dev);
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if (!onkey->input)
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return -ENOMEM;
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onkey->input->name = "max77650_onkey";
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onkey->input->phys = "max77650_onkey/input0";
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onkey->input->id.bustype = BUS_I2C;
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input_set_capability(onkey->input, type, onkey->code);
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error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
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IRQF_ONESHOT, "onkey-down", onkey);
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if (error < 0)
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return error;
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error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
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IRQF_ONESHOT, "onkey-up", onkey);
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if (error < 0)
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return error;
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return input_register_device(onkey->input);
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}
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static const struct of_device_id max77650_onkey_of_match[] = {
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{ .compatible = "maxim,max77650-onkey" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max77650_onkey_of_match);
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static struct platform_driver max77650_onkey_driver = {
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.driver = {
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.name = "max77650-onkey",
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.of_match_table = max77650_onkey_of_match,
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},
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.probe = max77650_onkey_probe,
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};
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module_platform_driver(max77650_onkey_driver);
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MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
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MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:max77650-onkey");
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