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 #include <linux/slab.h>
  24
  25 #include <linux/mfd/pcf50633/core.h>
  26
  27 #define PCF50633_OOCSTAT_ONKEY  0x01
  28 #define PCF50633_REG_OOCSTAT    0x12
  29 #define PCF50633_REG_OOCMODE    0x10
  30
  31 struct pcf50633_input {
  32         struct pcf50633 *pcf;
  33         struct input_dev *input_dev;
  34 };
  35
  36 static void
  37 pcf50633_input_irq(int irq, void *data)
  38 {
  39         struct pcf50633_input *input;
  40         int onkey_released;
  41
  42         input = data;
  43
  44         /* We report only one event depending on the key press status */
  45         onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
  46                                                 & PCF50633_OOCSTAT_ONKEY;
  47
  48         if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
  49                 input_report_key(input->input_dev, KEY_POWER, 1);
  50         else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
  51                 input_report_key(input->input_dev, KEY_POWER, 0);
  52
  53         input_sync(input->input_dev);
  54 }
  55
  56 static int pcf50633_input_probe(struct platform_device *pdev)
  57 {
  58         struct pcf50633_input *input;
  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 = dev_to_pcf50633(pdev->dev.parent);
  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(input->pcf, PCF50633_IRQ_ONKEYR,
  89                                 pcf50633_input_irq, input);
  90         pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
  91                                 pcf50633_input_irq, input);
  92
  93         return 0;
  94 }
  95
  96 static int 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
 109 static struct platform_driver pcf50633_input_driver = {
 110         .driver = {
 111                 .name = "pcf50633-input",
 112         },
 113         .probe = pcf50633_input_probe,
 114         .remove = pcf50633_input_remove,
 115 };
 116 module_platform_driver(pcf50633_input_driver);
 117
 118 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 119 MODULE_DESCRIPTION("PCF50633 input driver");
 120 MODULE_LICENSE("GPL");
 121 MODULE_ALIAS("platform:pcf50633-input");