cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

e3x0-button.c (3222B)

      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");