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114 lines
2.6 KiB
114 lines
2.6 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Generic GPIO beeper driver");
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