LXR linux/drivers/input/misc/ab8500-ponkey.c

   1/*
   2 * Copyright (C) ST-Ericsson SA 2010
   3 *
   4 * License Terms: GNU General Public License v2
   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 * @input_dev: 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                dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
  60                return irq_dbf;
  61        }
  62
  63        irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
  64        if (irq_dbr < 0) {
  65                dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
  66                return irq_dbr;
  67        }
  68
  69        ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
  70                              GFP_KERNEL);
  71        if (!ponkey)
  72                return -ENOMEM;
  73
  74        input = devm_input_allocate_device(&pdev->dev);
  75        if (!input)
  76                return -ENOMEM;
  77
  78        ponkey->idev = input;
  79        ponkey->ab8500 = ab8500;
  80        ponkey->irq_dbf = irq_dbf;
  81        ponkey->irq_dbr = irq_dbr;
  82
  83        input->name = "AB8500 POn(PowerOn) Key";
  84        input->dev.parent = &pdev->dev;
  85
  86        input_set_capability(input, EV_KEY, KEY_POWER);
  87
  88        error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
  89                                             ab8500_ponkey_handler, 0,
  90                                             "ab8500-ponkey-dbf", ponkey);
  91        if (error < 0) {
  92                dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
  93                        ponkey->irq_dbf, error);
  94                return error;
  95        }
  96
  97        error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
  98                                             ab8500_ponkey_handler, 0,
  99                                             "ab8500-ponkey-dbr", ponkey);
 100        if (error < 0) {
 101                dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
 102                        ponkey->irq_dbr, error);
 103                return error;
 104        }
 105
 106        error = input_register_device(ponkey->idev);
 107        if (error) {
 108                dev_err(ab8500->dev, "Can't register input device: %d\n", error);
 109                return error;
 110        }
 111
 112        return 0;
 113}
 114
 115#ifdef CONFIG_OF
 116static const struct of_device_id ab8500_ponkey_match[] = {
 117        { .compatible = "stericsson,ab8500-ponkey", },
 118        {}
 119};
 120MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
 121#endif
 122
 123static struct platform_driver ab8500_ponkey_driver = {
 124        .driver         = {
 125                .name   = "ab8500-poweron-key",
 126                .of_match_table = of_match_ptr(ab8500_ponkey_match),
 127        },
 128        .probe          = ab8500_ponkey_probe,
 129};
 130module_platform_driver(ab8500_ponkey_driver);
 131
 132MODULE_LICENSE("GPL v2");
 133MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
 134MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
 135