56580c2cb7
Calling device_init_wakeup in the remove function is unnecessary since the device is going away, and thus won't be able to cause any wakeups under any circumstances. Besides, the driver cleanup code already handles the necessary cleanup. Similarly, disabling wakeup in the probe error path is unnecessary, as is disabling wakeup in the probe function in the first place. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
156 lines
3.8 KiB
C
156 lines
3.8 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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static int e3x0_button_remove(struct platform_device *pdev)
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{
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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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.remove = e3x0_button_remove,
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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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