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/init.h>
  20#include <linux/device.h>
  21#include <linux/platform_device.h>
  22#include <linux/input.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 __devinit pcf50633_input_probe(struct platform_device *pdev)
  56{
  57        struct pcf50633_input *input;
  58        struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
  59        struct input_dev *input_dev;
  60        int ret;
  61
  62
  63        input = kzalloc(sizeof(*input), GFP_KERNEL);
  64        if (!input)
  65                return -ENOMEM;
  66
  67        input_dev = input_allocate_device();
  68        if (!input_dev) {
  69                kfree(input);
  70                return -ENOMEM;
  71        }
  72
  73        platform_set_drvdata(pdev, input);
  74        input->pcf = pdata->pcf;
  75        input->input_dev = input_dev;
  76
  77        input_dev->name = "PCF50633 PMU events";
  78        input_dev->id.bustype = BUS_I2C;
  79        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
  80        set_bit(KEY_POWER, input_dev->keybit);
  81
  82        ret = input_register_device(input_dev);
  83        if (ret) {
  84                input_free_device(input_dev);
  85                kfree(input);
  86                return ret;
  87        }
  88        pcf50633_register_irq(pdata->pcf, PCF50633_IRQ_ONKEYR,
  89                                pcf50633_input_irq, input);
  90        pcf50633_register_irq(pdata->pcf, PCF50633_IRQ_ONKEYF,
  91                                pcf50633_input_irq, input);
  92
  93        return 0;
  94}
  95
  96static int __devexit pcf50633_input_remove(struct platform_device *pdev)
  97{
  98        struct pcf50633_input *input  = platform_get_drvdata(pdev);
  99
 100        pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
 101        pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
 102
 103        input_unregister_device(input->input_dev);
 104        kfree(input);
 105
 106        return 0;
 107}
 108
 109static struct platform_driver pcf50633_input_driver = {
 110        .driver = {
 111                .name = "pcf50633-input",
 112        },
 113        .probe = pcf50633_input_probe,
 114        .remove = __devexit_p(pcf50633_input_remove),
 115};
 116
 117static int __init pcf50633_input_init(void)
 118{
 119        return platform_driver_register(&pcf50633_input_driver);
 120}
 121module_init(pcf50633_input_init);
 122
 123static void __exit pcf50633_input_exit(void)
 124{
 125        platform_driver_unregister(&pcf50633_input_driver);
 126}
 127module_exit(pcf50633_input_exit);
 128
 129MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 130MODULE_DESCRIPTION("PCF50633 input driver");
 131MODULE_LICENSE("GPL");
 132MODULE_ALIAS("platform:pcf50633-input");
 133