LXR linux/drivers/input/misc/e3x0-button.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2014, National Instruments Corp. All rights reserved.
   4 *
   5 * Driver for NI Ettus Research USRP E3x0 Button Driver
   6 */
   7
   8#include <linux/device.h>
   9#include <linux/kernel.h>
  10#include <linux/module.h>
  11#include <linux/platform_device.h>
  12#include <linux/input.h>
  13#include <linux/interrupt.h>
  14#include <linux/of.h>
  15#include <linux/slab.h>
  16
  17static irqreturn_t e3x0_button_release_handler(int irq, void *data)
  18{
  19        struct input_dev *idev = data;
  20
  21        input_report_key(idev, KEY_POWER, 0);
  22        input_sync(idev);
  23
  24        return IRQ_HANDLED;
  25}
  26
  27static irqreturn_t e3x0_button_press_handler(int irq, void *data)
  28{
  29        struct input_dev *idev = data;
  30
  31        input_report_key(idev, KEY_POWER, 1);
  32        pm_wakeup_event(idev->dev.parent, 0);
  33        input_sync(idev);
  34
  35        return IRQ_HANDLED;
  36}
  37
  38static int __maybe_unused e3x0_button_suspend(struct device *dev)
  39{
  40        struct platform_device *pdev = to_platform_device(dev);
  41
  42        if (device_may_wakeup(dev))
  43                enable_irq_wake(platform_get_irq_byname(pdev, "press"));
  44
  45        return 0;
  46}
  47
  48static int __maybe_unused e3x0_button_resume(struct device *dev)
  49{
  50        struct platform_device *pdev = to_platform_device(dev);
  51
  52        if (device_may_wakeup(dev))
  53                disable_irq_wake(platform_get_irq_byname(pdev, "press"));
  54
  55        return 0;
  56}
  57
  58static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
  59                         e3x0_button_suspend, e3x0_button_resume);
  60
  61static int e3x0_button_probe(struct platform_device *pdev)
  62{
  63        struct input_dev *input;
  64        int irq_press, irq_release;
  65        int error;
  66
  67        irq_press = platform_get_irq_byname(pdev, "press");
  68        if (irq_press < 0)
  69                return irq_press;
  70
  71        irq_release = platform_get_irq_byname(pdev, "release");
  72        if (irq_release < 0)
  73                return irq_release;
  74
  75        input = devm_input_allocate_device(&pdev->dev);
  76        if (!input)
  77                return -ENOMEM;
  78
  79        input->name = "NI Ettus Research USRP E3x0 Button Driver";
  80        input->phys = "e3x0_button/input0";
  81        input->dev.parent = &pdev->dev;
  82
  83        input_set_capability(input, EV_KEY, KEY_POWER);
  84
  85        error = devm_request_irq(&pdev->dev, irq_press,
  86                                 e3x0_button_press_handler, 0,
  87                                 "e3x0-button", input);
  88        if (error) {
  89                dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
  90                        irq_press, error);
  91                return error;
  92        }
  93
  94        error = devm_request_irq(&pdev->dev, irq_release,
  95                                 e3x0_button_release_handler, 0,
  96                                 "e3x0-button", input);
  97        if (error) {
  98                dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
  99                        irq_release, error);
 100                return error;
 101        }
 102
 103        error = input_register_device(input);
 104        if (error) {
 105                dev_err(&pdev->dev, "Can't register input device: %d\n", error);
 106                return error;
 107        }
 108
 109        device_init_wakeup(&pdev->dev, 1);
 110        return 0;
 111}
 112
 113#ifdef CONFIG_OF
 114static const struct of_device_id e3x0_button_match[] = {
 115        { .compatible = "ettus,e3x0-button", },
 116        { }
 117};
 118MODULE_DEVICE_TABLE(of, e3x0_button_match);
 119#endif
 120
 121static struct platform_driver e3x0_button_driver = {
 122        .driver         = {
 123                .name   = "e3x0-button",
 124                .of_match_table = of_match_ptr(e3x0_button_match),
 125                .pm     = &e3x0_button_pm_ops,
 126        },
 127        .probe          = e3x0_button_probe,
 128};
 129
 130module_platform_driver(e3x0_button_driver);
 131
 132MODULE_LICENSE("GPL v2");
 133MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
 134MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
 135MODULE_ALIAS("platform:e3x0-button");
 136