linux/drivers/input/misc/ab8500-ponkey.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) ST-Ericsson SA 2010
   4 *
   5 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
   6 *
   7 * AB8500 Power-On Key handler
   8 */
   9
  10#include <linux/device.h>
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/platform_device.h>
  14#include <linux/input.h>
  15#include <linux/interrupt.h>
  16#include <linux/mfd/abx500/ab8500.h>
  17#include <linux/of.h>
  18#include <linux/slab.h>
  19
  20/**
  21 * struct ab8500_ponkey - ab8500 ponkey information
  22 * @idev: pointer to input device
  23 * @ab8500: ab8500 parent
  24 * @irq_dbf: irq number for falling transition
  25 * @irq_dbr: irq number for rising transition
  26 */
  27struct ab8500_ponkey {
  28        struct input_dev        *idev;
  29        struct ab8500           *ab8500;
  30        int                     irq_dbf;
  31        int                     irq_dbr;
  32};
  33
  34/* AB8500 gives us an interrupt when ONKEY is held */
  35static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
  36{
  37        struct ab8500_ponkey *ponkey = data;
  38
  39        if (irq == ponkey->irq_dbf)
  40                input_report_key(ponkey->idev, KEY_POWER, true);
  41        else if (irq == ponkey->irq_dbr)
  42                input_report_key(ponkey->idev, KEY_POWER, false);
  43
  44        input_sync(ponkey->idev);
  45
  46        return IRQ_HANDLED;
  47}
  48
  49static int ab8500_ponkey_probe(struct platform_device *pdev)
  50{
  51        struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
  52        struct ab8500_ponkey *ponkey;
  53        struct input_dev *input;
  54        int irq_dbf, irq_dbr;
  55        int error;
  56
  57        irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
  58        if (irq_dbf < 0)
  59                return irq_dbf;
  60
  61        irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
  62        if (irq_dbr < 0)
  63                return irq_dbr;
  64
  65        ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
  66                              GFP_KERNEL);
  67        if (!ponkey)
  68                return -ENOMEM;
  69
  70        input = devm_input_allocate_device(&pdev->dev);
  71        if (!input)
  72                return -ENOMEM;
  73
  74        ponkey->idev = input;
  75        ponkey->ab8500 = ab8500;
  76        ponkey->irq_dbf = irq_dbf;
  77        ponkey->irq_dbr = irq_dbr;
  78
  79        input->name = "AB8500 POn(PowerOn) Key";
  80        input->dev.parent = &pdev->dev;
  81
  82        input_set_capability(input, EV_KEY, KEY_POWER);
  83
  84        error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
  85                                             ab8500_ponkey_handler, 0,
  86                                             "ab8500-ponkey-dbf", ponkey);
  87        if (error < 0) {
  88                dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
  89                        ponkey->irq_dbf, error);
  90                return error;
  91        }
  92
  93        error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
  94                                             ab8500_ponkey_handler, 0,
  95                                             "ab8500-ponkey-dbr", ponkey);
  96        if (error < 0) {
  97                dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
  98                        ponkey->irq_dbr, error);
  99                return error;
 100        }
 101
 102        error = input_register_device(ponkey->idev);
 103        if (error) {
 104                dev_err(ab8500->dev, "Can't register input device: %d\n", error);
 105                return error;
 106        }
 107
 108        return 0;
 109}
 110
 111#ifdef CONFIG_OF
 112static const struct of_device_id ab8500_ponkey_match[] = {
 113        { .compatible = "stericsson,ab8500-ponkey", },
 114        {}
 115};
 116MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
 117#endif
 118
 119static struct platform_driver ab8500_ponkey_driver = {
 120        .driver         = {
 121                .name   = "ab8500-poweron-key",
 122                .of_match_table = of_match_ptr(ab8500_ponkey_match),
 123        },
 124        .probe          = ab8500_ponkey_probe,
 125};
 126module_platform_driver(ab8500_ponkey_driver);
 127
 128MODULE_LICENSE("GPL v2");
 129MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
 130MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
 131