[linux-2.6-block.git] / drivers / input / misc / gpio-beeper.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Generic GPIO beeper driver
 *
 * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
 */

#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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
976358e2 AS	2	/*
	3	* Generic GPIO beeper driver
	4	*
c95dc011	5	* Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
976358e2 AS	6	*/
	7
	8	#include <linux/input.h>
	9	#include <linux/module.h>
c95dc011 AS	10	#include <linux/gpio/consumer.h>
c95dc011 AS	11	#include <linux/of.h>
976358e2 AS	12	#include <linux/workqueue.h>
	13	#include <linux/platform_device.h>
	14
	15	#define BEEPER_MODNAME "gpio-beeper"
	16
	17	struct gpio_beeper {
	18	struct work_struct work;
c95dc011	19	struct gpio_desc *desc;
976358e2 AS	20	bool beeping;
	21	};
	22
	23	static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
	24	{
c95dc011	25	gpiod_set_value_cansleep(beep->desc, on);
976358e2 AS	26	}
	27
	28	static void gpio_beeper_work(struct work_struct *work)
	29	{
	30	struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
	31
	32	gpio_beeper_toggle(beep, beep->beeping);
	33	}
	34
	35	static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
	36	unsigned int code, int value)
	37	{
	38	struct gpio_beeper *beep = input_get_drvdata(dev);
	39
	40	if (type != EV_SND \|\| code != SND_BELL)
	41	return -ENOTSUPP;
	42
	43	if (value < 0)
	44	return -EINVAL;
	45
	46	beep->beeping = value;
	47	/* Schedule work to actually turn the beeper on or off */
	48	schedule_work(&beep->work);
	49
	50	return 0;
	51	}
	52
	53	static void gpio_beeper_close(struct input_dev *input)
	54	{
	55	struct gpio_beeper *beep = input_get_drvdata(input);
	56
	57	cancel_work_sync(&beep->work);
	58	gpio_beeper_toggle(beep, false);
	59	}
	60
	61	static int gpio_beeper_probe(struct platform_device *pdev)
	62	{
	63	struct gpio_beeper *beep;
976358e2	64	struct input_dev *input;
976358e2 AS	65
	66	beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
	67	if (!beep)
	68	return -ENOMEM;
	69
ea0afac4	70	beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
c95dc011 AS	71	if (IS_ERR(beep->desc))
c95dc011 AS	72	return PTR_ERR(beep->desc);
976358e2 AS	73
	74	input = devm_input_allocate_device(&pdev->dev);
	75	if (!input)
	76	return -ENOMEM;
	77
	78	INIT_WORK(&beep->work, gpio_beeper_work);
	79
	80	input->name = pdev->name;
	81	input->id.bustype = BUS_HOST;
	82	input->id.vendor = 0x0001;
	83	input->id.product = 0x0001;
	84	input->id.version = 0x0100;
	85	input->close = gpio_beeper_close;
	86	input->event = gpio_beeper_event;
	87
	88	input_set_capability(input, EV_SND, SND_BELL);
	89
976358e2 AS	90	input_set_drvdata(input, beep);
	91
	92	return input_register_device(input);
	93	}
	94
c95dc011	95	#ifdef CONFIG_OF
355b9115	96	static const struct of_device_id gpio_beeper_of_match[] = {
976358e2 AS	97	{ .compatible = BEEPER_MODNAME, },
	98	{ }
	99	};
	100	MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
c95dc011	101	#endif
976358e2 AS	102
	103	static struct platform_driver gpio_beeper_platform_driver = {
	104	.driver = {
	105	.name = BEEPER_MODNAME,
c95dc011	106	.of_match_table = of_match_ptr(gpio_beeper_of_match),
976358e2 AS	107	},
	108	.probe = gpio_beeper_probe,
	109	};
	110	module_platform_driver(gpio_beeper_platform_driver);
	111
	112	MODULE_LICENSE("GPL");
	113	MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
	114	MODULE_DESCRIPTION("Generic GPIO beeper driver");