e3x0-button.c
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/*
* Copyright (c) 2014, National Instruments Corp. All rights reserved.
*
* Driver for NI Ettus Research USRP E3x0 Button Driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/slab.h>
static irqreturn_t e3x0_button_release_handler(int irq, void *data)
{
struct input_dev *idev = data;
input_report_key(idev, KEY_POWER, 0);
input_sync(idev);
return IRQ_HANDLED;
}
static irqreturn_t e3x0_button_press_handler(int irq, void *data)
{
struct input_dev *idev = data;
input_report_key(idev, KEY_POWER, 1);
pm_wakeup_event(idev->dev.parent, 0);
input_sync(idev);
return IRQ_HANDLED;
}
static int __maybe_unused e3x0_button_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
if (device_may_wakeup(dev))
enable_irq_wake(platform_get_irq_byname(pdev, "press"));
return 0;
}
static int __maybe_unused e3x0_button_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
if (device_may_wakeup(dev))
disable_irq_wake(platform_get_irq_byname(pdev, "press"));
return 0;
}
static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
e3x0_button_suspend, e3x0_button_resume);
static int e3x0_button_probe(struct platform_device *pdev)
{
struct input_dev *input;
int irq_press, irq_release;
int error;
irq_press = platform_get_irq_byname(pdev, "press");
if (irq_press < 0) {
dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n",
irq_press);
return irq_press;
}
irq_release = platform_get_irq_byname(pdev, "release");
if (irq_release < 0) {
dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n",
irq_release);
return irq_release;
}
input = devm_input_allocate_device(&pdev->dev);
if (!input)
return -ENOMEM;
input->name = "NI Ettus Research USRP E3x0 Button Driver";
input->phys = "e3x0_button/input0";
input->dev.parent = &pdev->dev;
input_set_capability(input, EV_KEY, KEY_POWER);
error = devm_request_irq(&pdev->dev, irq_press,
e3x0_button_press_handler, 0,
"e3x0-button", input);
if (error) {
dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
irq_press, error);
return error;
}
error = devm_request_irq(&pdev->dev, irq_release,
e3x0_button_release_handler, 0,
"e3x0-button", input);
if (error) {
dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
irq_release, error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev, "Can't register input device: %d\n", error);
return error;
}
platform_set_drvdata(pdev, input);
device_init_wakeup(&pdev->dev, 1);
return 0;
}
static int e3x0_button_remove(struct platform_device *pdev)
{
device_init_wakeup(&pdev->dev, 0);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id e3x0_button_match[] = {
{ .compatible = "ettus,e3x0-button", },
{ }
};
MODULE_DEVICE_TABLE(of, e3x0_button_match);
#endif
static struct platform_driver e3x0_button_driver = {
.driver = {
.name = "e3x0-button",
.of_match_table = of_match_ptr(e3x0_button_match),
.pm = &e3x0_button_pm_ops,
},
.probe = e3x0_button_probe,
.remove = e3x0_button_remove,
};
module_platform_driver(e3x0_button_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
MODULE_ALIAS("platform:e3x0-button");