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

   1/*
   2 * Copyright (c) 2014, National Instruments Corp. All rights reserved.
   3 *
   4 * Driver for NI Ettus Research USRP E3x0 Button Driver
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; version 2 of the License.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 * GNU General Public License for more details.
  14 */
  15
  16#include <linux/device.h>
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/platform_device.h>
  20#include <linux/input.h>
  21#include <linux/interrupt.h>
  22#include <linux/of.h>
  23#include <linux/slab.h>
  24
  25static irqreturn_t e3x0_button_release_handler(int irq, void *data)
  26{
  27        struct input_dev *idev = data;
  28
  29        input_report_key(idev, KEY_POWER, 0);
  30        input_sync(idev);
  31
  32        return IRQ_HANDLED;
  33}
  34
  35static irqreturn_t e3x0_button_press_handler(int irq, void *data)
  36{
  37        struct input_dev *idev = data;
  38
  39        input_report_key(idev, KEY_POWER, 1);
  40        pm_wakeup_event(idev->dev.parent, 0);
  41        input_sync(idev);
  42
  43        return IRQ_HANDLED;
  44}
  45
  46static int __maybe_unused e3x0_button_suspend(struct device *dev)
  47{
  48        struct platform_device *pdev = to_platform_device(dev);
  49
  50        if (device_may_wakeup(dev))
  51                enable_irq_wake(platform_get_irq_byname(pdev, "press"));
  52
  53        return 0;
  54}
  55
  56static int __maybe_unused e3x0_button_resume(struct device *dev)
  57{
  58        struct platform_device *pdev = to_platform_device(dev);
  59
  60        if (device_may_wakeup(dev))
  61                disable_irq_wake(platform_get_irq_byname(pdev, "press"));
  62
  63        return 0;
  64}
  65
  66static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
  67                         e3x0_button_suspend, e3x0_button_resume);
  68
  69static int e3x0_button_probe(struct platform_device *pdev)
  70{
  71        struct input_dev *input;
  72        int irq_press, irq_release;
  73        int error;
  74
  75        irq_press = platform_get_irq_byname(pdev, "press");
  76        if (irq_press < 0) {
  77                dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n",
  78                        irq_press);
  79                return irq_press;
  80        }
  81
  82        irq_release = platform_get_irq_byname(pdev, "release");
  83        if (irq_release < 0) {
  84                dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n",
  85                        irq_release);
  86                return irq_release;
  87        }
  88
  89        input = devm_input_allocate_device(&pdev->dev);
  90        if (!input)
  91                return -ENOMEM;
  92
  93        input->name = "NI Ettus Research USRP E3x0 Button Driver";
  94        input->phys = "e3x0_button/input0";
  95        input->dev.parent = &pdev->dev;
  96
  97        input_set_capability(input, EV_KEY, KEY_POWER);
  98
  99        error = devm_request_irq(&pdev->dev, irq_press,
 100                                 e3x0_button_press_handler, 0,
 101                                 "e3x0-button", input);
 102        if (error) {
 103                dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
 104                        irq_press, error);
 105                return error;
 106        }
 107
 108        error = devm_request_irq(&pdev->dev, irq_release,
 109                                 e3x0_button_release_handler, 0,
 110                                 "e3x0-button", input);
 111        if (error) {
 112                dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
 113                        irq_release, error);
 114                return error;
 115        }
 116
 117        error = input_register_device(input);
 118        if (error) {
 119                dev_err(&pdev->dev, "Can't register input device: %d\n", error);
 120                return error;
 121        }
 122
 123        device_init_wakeup(&pdev->dev, 1);
 124        return 0;
 125}
 126
 127#ifdef CONFIG_OF
 128static const struct of_device_id e3x0_button_match[] = {
 129        { .compatible = "ettus,e3x0-button", },
 130        { }
 131};
 132MODULE_DEVICE_TABLE(of, e3x0_button_match);
 133#endif
 134
 135static struct platform_driver e3x0_button_driver = {
 136        .driver         = {
 137                .name   = "e3x0-button",
 138                .of_match_table = of_match_ptr(e3x0_button_match),
 139                .pm     = &e3x0_button_pm_ops,
 140        },
 141        .probe          = e3x0_button_probe,
 142};
 143
 144module_platform_driver(e3x0_button_driver);
 145
 146MODULE_LICENSE("GPL v2");
 147MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
 148MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
 149MODULE_ALIAS("platform:e3x0-button");
 150