LXR linux/drivers/input/misc/pcf50633-input.c

   1/* NXP PCF50633 Input Driver
   2 *
   3 * (C) 2006-2008 by Openmoko, Inc.
   4 * Author: Balaji Rao <balajirrao@openmoko.org>
   5 * All rights reserved.
   6 *
   7 * Broken down from monstrous PCF50633 driver mainly by
   8 * Harald Welte, Andy Green and Werner Almesberger
   9 *
  10 *  This program is free software; you can redistribute  it and/or modify it
  11 *  under  the terms of  the GNU General  Public License as published by the
  12 *  Free Software Foundation;  either version 2 of the  License, or (at your
  13 *  option) any later version.
  14 *
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/device.h>
  20#include <linux/platform_device.h>
  21#include <linux/input.h>
  22#include <linux/slab.h>
  23
  24#include <linux/mfd/pcf50633/core.h>
  25
  26#define PCF50633_OOCSTAT_ONKEY  0x01
  27#define PCF50633_REG_OOCSTAT    0x12
  28#define PCF50633_REG_OOCMODE    0x10
  29
  30struct pcf50633_input {
  31        struct pcf50633 *pcf;
  32        struct input_dev *input_dev;
  33};
  34
  35static void
  36pcf50633_input_irq(int irq, void *data)
  37{
  38        struct pcf50633_input *input;
  39        int onkey_released;
  40
  41        input = data;
  42
  43        /* We report only one event depending on the key press status */
  44        onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
  45                                                & PCF50633_OOCSTAT_ONKEY;
  46
  47        if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
  48                input_report_key(input->input_dev, KEY_POWER, 1);
  49        else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
  50                input_report_key(input->input_dev, KEY_POWER, 0);
  51
  52        input_sync(input->input_dev);
  53}
  54
  55static int pcf50633_input_probe(struct platform_device *pdev)
  56{
  57        struct pcf50633_input *input;
  58        struct input_dev *input_dev;
  59        int ret;
  60
  61
  62        input = kzalloc(sizeof(*input), GFP_KERNEL);
  63        if (!input)
  64                return -ENOMEM;
  65
  66        input_dev = input_allocate_device();
  67        if (!input_dev) {
  68                kfree(input);
  69                return -ENOMEM;
  70        }
  71
  72        platform_set_drvdata(pdev, input);
  73        input->pcf = dev_to_pcf50633(pdev->dev.parent);
  74        input->input_dev = input_dev;
  75
  76        input_dev->name = "PCF50633 PMU events";
  77        input_dev->id.bustype = BUS_I2C;
  78        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
  79        set_bit(KEY_POWER, input_dev->keybit);
  80
  81        ret = input_register_device(input_dev);
  82        if (ret) {
  83                input_free_device(input_dev);
  84                kfree(input);
  85                return ret;
  86        }
  87        pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
  88                                pcf50633_input_irq, input);
  89        pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
  90                                pcf50633_input_irq, input);
  91
  92        return 0;
  93}
  94
  95static int pcf50633_input_remove(struct platform_device *pdev)
  96{
  97        struct pcf50633_input *input  = platform_get_drvdata(pdev);
  98
  99        pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
 100        pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
 101
 102        input_unregister_device(input->input_dev);
 103        kfree(input);
 104
 105        return 0;
 106}
 107
 108static struct platform_driver pcf50633_input_driver = {
 109        .driver = {
 110                .name = "pcf50633-input",
 111        },
 112        .probe = pcf50633_input_probe,
 113        .remove = pcf50633_input_remove,
 114};
 115module_platform_driver(pcf50633_input_driver);
 116
 117MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 118MODULE_DESCRIPTION("PCF50633 input driver");
 119MODULE_LICENSE("GPL");
 120MODULE_ALIAS("platform:pcf50633-input");
 121