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