2874c5fd28
Based on 1 normalized pattern(s): 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 either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generic GPIO beeper driver
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*
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* Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#define BEEPER_MODNAME "gpio-beeper"
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struct gpio_beeper {
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struct work_struct work;
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struct gpio_desc *desc;
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bool beeping;
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};
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static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
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{
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gpiod_set_value_cansleep(beep->desc, on);
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}
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static void gpio_beeper_work(struct work_struct *work)
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{
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struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
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gpio_beeper_toggle(beep, beep->beeping);
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}
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static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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struct gpio_beeper *beep = input_get_drvdata(dev);
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if (type != EV_SND || code != SND_BELL)
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return -ENOTSUPP;
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if (value < 0)
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return -EINVAL;
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beep->beeping = value;
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/* Schedule work to actually turn the beeper on or off */
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schedule_work(&beep->work);
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return 0;
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}
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static void gpio_beeper_close(struct input_dev *input)
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{
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struct gpio_beeper *beep = input_get_drvdata(input);
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cancel_work_sync(&beep->work);
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gpio_beeper_toggle(beep, false);
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}
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static int gpio_beeper_probe(struct platform_device *pdev)
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{
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struct gpio_beeper *beep;
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struct input_dev *input;
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beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
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if (!beep)
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return -ENOMEM;
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beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
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if (IS_ERR(beep->desc))
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return PTR_ERR(beep->desc);
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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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INIT_WORK(&beep->work, gpio_beeper_work);
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input->name = pdev->name;
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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input->close = gpio_beeper_close;
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input->event = gpio_beeper_event;
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input_set_capability(input, EV_SND, SND_BELL);
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input_set_drvdata(input, beep);
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return input_register_device(input);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id gpio_beeper_of_match[] = {
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{ .compatible = BEEPER_MODNAME, },
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{ }
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};
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MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
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#endif
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static struct platform_driver gpio_beeper_platform_driver = {
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.driver = {
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.name = BEEPER_MODNAME,
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.of_match_table = of_match_ptr(gpio_beeper_of_match),
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},
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.probe = gpio_beeper_probe,
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};
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module_platform_driver(gpio_beeper_platform_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("Generic GPIO beeper driver");
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