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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 
 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");
121 

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