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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* NXP PCF50633 Input Driver
   3 *
   4 * (C) 2006-2008 by Openmoko, Inc.
   5 * Author: Balaji Rao <balajirrao@openmoko.org>
   6 * All rights reserved.
   7 *
   8 * Broken down from monstrous PCF50633 driver mainly by
   9 * Harald Welte, Andy Green and Werner Almesberger
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <linux/device.h>
  15#include <linux/platform_device.h>
  16#include <linux/input.h>
  17#include <linux/slab.h>
  18
  19#include <linux/mfd/pcf50633/core.h>
  20
  21#define PCF50633_OOCSTAT_ONKEY  0x01
  22#define PCF50633_REG_OOCSTAT    0x12
  23#define PCF50633_REG_OOCMODE    0x10
  24
  25struct pcf50633_input {
  26        struct pcf50633 *pcf;
  27        struct input_dev *input_dev;
  28};
  29
  30static void
  31pcf50633_input_irq(int irq, void *data)
  32{
  33        struct pcf50633_input *input;
  34        int onkey_released;
  35
  36        input = data;
  37
  38        /* We report only one event depending on the key press status */
  39        onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
  40                                                & PCF50633_OOCSTAT_ONKEY;
  41
  42        if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
  43                input_report_key(input->input_dev, KEY_POWER, 1);
  44        else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
  45                input_report_key(input->input_dev, KEY_POWER, 0);
  46
  47        input_sync(input->input_dev);
  48}
  49
  50static int pcf50633_input_probe(struct platform_device *pdev)
  51{
  52        struct pcf50633_input *input;
  53        struct input_dev *input_dev;
  54        int ret;
  55
  56
  57        input = kzalloc(sizeof(*input), GFP_KERNEL);
  58        if (!input)
  59                return -ENOMEM;
  60
  61        input_dev = input_allocate_device();
  62        if (!input_dev) {
  63                kfree(input);
  64                return -ENOMEM;
  65        }
  66
  67        platform_set_drvdata(pdev, input);
  68        input->pcf = dev_to_pcf50633(pdev->dev.parent);
  69        input->input_dev = input_dev;
  70
  71        input_dev->name = "PCF50633 PMU events";
  72        input_dev->id.bustype = BUS_I2C;
  73        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
  74        set_bit(KEY_POWER, input_dev->keybit);
  75
  76        ret = input_register_device(input_dev);
  77        if (ret) {
  78                input_free_device(input_dev);
  79                kfree(input);
  80                return ret;
  81        }
  82        pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
  83                                pcf50633_input_irq, input);
  84        pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
  85                                pcf50633_input_irq, input);
  86
  87        return 0;
  88}
  89
  90static int pcf50633_input_remove(struct platform_device *pdev)
  91{
  92        struct pcf50633_input *input  = platform_get_drvdata(pdev);
  93
  94        pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
  95        pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
  96
  97        input_unregister_device(input->input_dev);
  98        kfree(input);
  99
 100        return 0;
 101}
 102
 103static struct platform_driver pcf50633_input_driver = {
 104        .driver = {
 105                .name = "pcf50633-input",
 106        },
 107        .probe = pcf50633_input_probe,
 108        .remove = pcf50633_input_remove,
 109};
 110module_platform_driver(pcf50633_input_driver);
 111
 112MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 113MODULE_DESCRIPTION("PCF50633 input driver");
 114MODULE_LICENSE("GPL");
 115MODULE_ALIAS("platform:pcf50633-input");
 116