linux/drivers/input/misc/max77650-onkey.c
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   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// Copyright (C) 2018 BayLibre SAS
   4// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
   5//
   6// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
   7
   8#include <linux/i2c.h>
   9#include <linux/input.h>
  10#include <linux/interrupt.h>
  11#include <linux/mfd/max77650.h>
  12#include <linux/module.h>
  13#include <linux/platform_device.h>
  14#include <linux/regmap.h>
  15
  16#define MAX77650_ONKEY_MODE_MASK        BIT(3)
  17#define MAX77650_ONKEY_MODE_PUSH        0x00
  18#define MAX77650_ONKEY_MODE_SLIDE       BIT(3)
  19
  20struct max77650_onkey {
  21        struct input_dev *input;
  22        unsigned int code;
  23};
  24
  25static irqreturn_t max77650_onkey_falling(int irq, void *data)
  26{
  27        struct max77650_onkey *onkey = data;
  28
  29        input_report_key(onkey->input, onkey->code, 0);
  30        input_sync(onkey->input);
  31
  32        return IRQ_HANDLED;
  33}
  34
  35static irqreturn_t max77650_onkey_rising(int irq, void *data)
  36{
  37        struct max77650_onkey *onkey = data;
  38
  39        input_report_key(onkey->input, onkey->code, 1);
  40        input_sync(onkey->input);
  41
  42        return IRQ_HANDLED;
  43}
  44
  45static int max77650_onkey_probe(struct platform_device *pdev)
  46{
  47        int irq_r, irq_f, error, mode;
  48        struct max77650_onkey *onkey;
  49        struct device *dev, *parent;
  50        struct regmap *map;
  51        unsigned int type;
  52
  53        dev = &pdev->dev;
  54        parent = dev->parent;
  55
  56        map = dev_get_regmap(parent, NULL);
  57        if (!map)
  58                return -ENODEV;
  59
  60        onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
  61        if (!onkey)
  62                return -ENOMEM;
  63
  64        error = device_property_read_u32(dev, "linux,code", &onkey->code);
  65        if (error)
  66                onkey->code = KEY_POWER;
  67
  68        if (device_property_read_bool(dev, "maxim,onkey-slide")) {
  69                mode = MAX77650_ONKEY_MODE_SLIDE;
  70                type = EV_SW;
  71        } else {
  72                mode = MAX77650_ONKEY_MODE_PUSH;
  73                type = EV_KEY;
  74        }
  75
  76        error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
  77                                   MAX77650_ONKEY_MODE_MASK, mode);
  78        if (error)
  79                return error;
  80
  81        irq_f = platform_get_irq_byname(pdev, "nEN_F");
  82        if (irq_f < 0)
  83                return irq_f;
  84
  85        irq_r = platform_get_irq_byname(pdev, "nEN_R");
  86        if (irq_r < 0)
  87                return irq_r;
  88
  89        onkey->input = devm_input_allocate_device(dev);
  90        if (!onkey->input)
  91                return -ENOMEM;
  92
  93        onkey->input->name = "max77650_onkey";
  94        onkey->input->phys = "max77650_onkey/input0";
  95        onkey->input->id.bustype = BUS_I2C;
  96        input_set_capability(onkey->input, type, onkey->code);
  97
  98        error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
  99                                             IRQF_ONESHOT, "onkey-down", onkey);
 100        if (error < 0)
 101                return error;
 102
 103        error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
 104                                             IRQF_ONESHOT, "onkey-up", onkey);
 105        if (error < 0)
 106                return error;
 107
 108        return input_register_device(onkey->input);
 109}
 110
 111static const struct of_device_id max77650_onkey_of_match[] = {
 112        { .compatible = "maxim,max77650-onkey" },
 113        { }
 114};
 115MODULE_DEVICE_TABLE(of, max77650_onkey_of_match);
 116
 117static struct platform_driver max77650_onkey_driver = {
 118        .driver = {
 119                .name = "max77650-onkey",
 120                .of_match_table = max77650_onkey_of_match,
 121        },
 122        .probe = max77650_onkey_probe,
 123};
 124module_platform_driver(max77650_onkey_driver);
 125
 126MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
 127MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
 128MODULE_LICENSE("GPL v2");
 129MODULE_ALIAS("platform:max77650-onkey");
 130