[mirror_ubuntu-bionic-kernel.git] / drivers / input / misc / gpio-beeper.c

/*
 * Generic GPIO beeper driver
 *
 * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
 *
 * 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.
 */

#include <linux/input.h>
#include <linux/module.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>

#define BEEPER_MODNAME		"gpio-beeper"

struct gpio_beeper {
	struct work_struct	work;
	struct gpio_desc	*desc;
	bool			beeping;
};

static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
{
	gpiod_set_value_cansleep(beep->desc, on);
}

static void gpio_beeper_work(struct work_struct *work)
{
	struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);

	gpio_beeper_toggle(beep, beep->beeping);
}

static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
			     unsigned int code, int value)
{
	struct gpio_beeper *beep = input_get_drvdata(dev);

	if (type != EV_SND || code != SND_BELL)
		return -ENOTSUPP;

	if (value < 0)
		return -EINVAL;

	beep->beeping = value;
	/* Schedule work to actually turn the beeper on or off */
	schedule_work(&beep->work);

	return 0;
}

static void gpio_beeper_close(struct input_dev *input)
{
	struct gpio_beeper *beep = input_get_drvdata(input);

	cancel_work_sync(&beep->work);
	gpio_beeper_toggle(beep, false);
}

static int gpio_beeper_probe(struct platform_device *pdev)
{
	struct gpio_beeper *beep;
	struct input_dev *input;

	beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
	if (!beep)
		return -ENOMEM;

	beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
	if (IS_ERR(beep->desc))
		return PTR_ERR(beep->desc);

	input = devm_input_allocate_device(&pdev->dev);
	if (!input)
		return -ENOMEM;

	INIT_WORK(&beep->work, gpio_beeper_work);

	input->name		= pdev->name;
	input->id.bustype	= BUS_HOST;
	input->id.vendor	= 0x0001;
	input->id.product	= 0x0001;
	input->id.version	= 0x0100;
	input->close		= gpio_beeper_close;
	input->event		= gpio_beeper_event;

	input_set_capability(input, EV_SND, SND_BELL);

	input_set_drvdata(input, beep);

	return input_register_device(input);
}

#ifdef CONFIG_OF
static const struct of_device_id gpio_beeper_of_match[] = {
	{ .compatible = BEEPER_MODNAME, },
	{ }
};
MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
#endif

static struct platform_driver gpio_beeper_platform_driver = {
	.driver	= {
		.name		= BEEPER_MODNAME,
		.of_match_table	= of_match_ptr(gpio_beeper_of_match),
	},
	.probe	= gpio_beeper_probe,
};
module_platform_driver(gpio_beeper_platform_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Generic GPIO beeper driver");
Commit	Line	Data
976358e2 AS	1	/*
	2	* Generic GPIO beeper driver
	3	*
c95dc011	4	* Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
976358e2 AS	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/input.h>
	13	#include <linux/module.h>
c95dc011 AS	14	#include <linux/gpio/consumer.h>
c95dc011 AS	15	#include <linux/of.h>
976358e2 AS	16	#include <linux/workqueue.h>
	17	#include <linux/platform_device.h>
	18
	19	#define BEEPER_MODNAME "gpio-beeper"
	20
	21	struct gpio_beeper {
	22	struct work_struct work;
c95dc011	23	struct gpio_desc *desc;
976358e2 AS	24	bool beeping;
	25	};
	26
	27	static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
	28	{
c95dc011	29	gpiod_set_value_cansleep(beep->desc, on);
976358e2 AS	30	}
	31
	32	static void gpio_beeper_work(struct work_struct *work)
	33	{
	34	struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
	35
	36	gpio_beeper_toggle(beep, beep->beeping);
	37	}
	38
	39	static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
	40	unsigned int code, int value)
	41	{
	42	struct gpio_beeper *beep = input_get_drvdata(dev);
	43
	44	if (type != EV_SND \|\| code != SND_BELL)
	45	return -ENOTSUPP;
	46
	47	if (value < 0)
	48	return -EINVAL;
	49
	50	beep->beeping = value;
	51	/* Schedule work to actually turn the beeper on or off */
	52	schedule_work(&beep->work);
	53
	54	return 0;
	55	}
	56
	57	static void gpio_beeper_close(struct input_dev *input)
	58	{
	59	struct gpio_beeper *beep = input_get_drvdata(input);
	60
	61	cancel_work_sync(&beep->work);
	62	gpio_beeper_toggle(beep, false);
	63	}
	64
	65	static int gpio_beeper_probe(struct platform_device *pdev)
	66	{
	67	struct gpio_beeper *beep;
976358e2	68	struct input_dev *input;
976358e2 AS	69
	70	beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
	71	if (!beep)
	72	return -ENOMEM;
	73
ea0afac4	74	beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
c95dc011 AS	75	if (IS_ERR(beep->desc))
c95dc011 AS	76	return PTR_ERR(beep->desc);
976358e2 AS	77
	78	input = devm_input_allocate_device(&pdev->dev);
	79	if (!input)
	80	return -ENOMEM;
	81
	82	INIT_WORK(&beep->work, gpio_beeper_work);
	83
	84	input->name = pdev->name;
	85	input->id.bustype = BUS_HOST;
	86	input->id.vendor = 0x0001;
	87	input->id.product = 0x0001;
	88	input->id.version = 0x0100;
	89	input->close = gpio_beeper_close;
	90	input->event = gpio_beeper_event;
	91
	92	input_set_capability(input, EV_SND, SND_BELL);
	93
976358e2 AS	94	input_set_drvdata(input, beep);
	95
	96	return input_register_device(input);
	97	}
	98
c95dc011	99	#ifdef CONFIG_OF
355b9115	100	static const struct of_device_id gpio_beeper_of_match[] = {
976358e2 AS	101	{ .compatible = BEEPER_MODNAME, },
	102	{ }
	103	};
	104	MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
c95dc011	105	#endif
976358e2 AS	106
	107	static struct platform_driver gpio_beeper_platform_driver = {
	108	.driver = {
	109	.name = BEEPER_MODNAME,
c95dc011	110	.of_match_table = of_match_ptr(gpio_beeper_of_match),
976358e2 AS	111	},
	112	.probe = gpio_beeper_probe,
	113	};
	114	module_platform_driver(gpio_beeper_platform_driver);
	115
	116	MODULE_LICENSE("GPL");
	117	MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
	118	MODULE_DESCRIPTION("Generic GPIO beeper driver");