125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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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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* 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; either version 2 of the License, or
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* (at your option) any later version.
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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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int err;
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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);
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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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err = gpiod_direction_output(beep->desc, 0);
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if (err)
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return err;
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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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.owner = THIS_MODULE,
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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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