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
  30 struct pcf50633_input {
  31         struct pcf50633 *pcf;
  32         struct input_dev *input_dev;
  33 };
  34
  35 static void
  36 pcf50633_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
  55 static 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
  95 static 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
 108 static struct platform_driver pcf50633_input_driver = {
 109         .driver = {
 110                 .name = "pcf50633-input",
 111         },
 112         .probe = pcf50633_input_probe,
 113         .remove = pcf50633_input_remove,
 114 };
 115 module_platform_driver(pcf50633_input_driver);
 116
 117 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 118 MODULE_DESCRIPTION("PCF50633 input driver");
 119 MODULE_LICENSE("GPL");
 120 MODULE_ALIAS("platform:pcf50633-input");