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Commit 976358e2 authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Dmitry Torokhov
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Input: add a new driver for GPIO beeper 



This patch adds a new driver for the beeper controlled via GPIO pin.
The driver does not depend on the architecture and is positioned as
a replacement for the specific drivers that are used for this function.

Signed-off-by: default avatarAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent b5fd2a3e

Documentation/devicetree/bindings/input/gpio-beeper.txt

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* GPIO beeper device tree bindings



Register a beeper connected to GPIO pin.



Required properties:

- compatible:	Should be "gpio-beeper".

- gpios:	From common gpio binding; gpio connection to beeper enable pin.



Example:

	beeper: beeper {

		compatible = "gpio-beeper";

		gpios = <&gpio3 23 GPIO_ACTIVE_HIGH>;

	};

drivers/input/misc/Kconfig

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@@ -222,6 +222,15 @@ config INPUT_GP2A 
	  To compile this driver as a module, choose M here: the

	  To compile this driver as a module, choose M here: the

	  module will be called gp2ap002a00f.

	  module will be called gp2ap002a00f.





config INPUT_GPIO_BEEPER

	tristate "Generic GPIO Beeper support"

	depends on OF_GPIO

	help

	  Say Y here if you have a beeper connected to a GPIO pin.



	  To compile this driver as a module, choose M here: the

	  module will be called gpio-beeper.



config INPUT_GPIO_TILT_POLLED

config INPUT_GPIO_TILT_POLLED

	tristate "Polled GPIO tilt switch"

	tristate "Polled GPIO tilt switch"

	depends on GPIOLIB

	depends on GPIOLIB

drivers/input/misc/Makefile

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@@ -27,6 +27,7 @@ obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o 
obj-$(CONFIG_INPUT_DA9055_ONKEY)	+= da9055_onkey.o

obj-$(CONFIG_INPUT_DA9055_ONKEY)	+= da9055_onkey.o

obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o

obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o

obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o

obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o

obj-$(CONFIG_INPUT_GPIO_BEEPER)		+= gpio-beeper.o

obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)	+= gpio_tilt_polled.o

obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)	+= gpio_tilt_polled.o

obj-$(CONFIG_HP_SDC_RTC)		+= hp_sdc_rtc.o

obj-$(CONFIG_HP_SDC_RTC)		+= hp_sdc_rtc.o

obj-$(CONFIG_INPUT_IMS_PCU)		+= ims-pcu.o

obj-$(CONFIG_INPUT_IMS_PCU)		+= ims-pcu.o

drivers/input/misc/gpio-beeper.c

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/*

 * Generic GPIO beeper driver

 *

 * Copyright (C) 2013 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/of_gpio.h>

#include <linux/workqueue.h>

#include <linux/platform_device.h>



#define BEEPER_MODNAME		"gpio-beeper"



struct gpio_beeper {

	struct work_struct	work;

	int			gpio;

	bool			active_low;

	bool			beeping;

};



static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)

{

	gpio_set_value_cansleep(beep->gpio, on ^ beep->active_low);

}



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;

	enum of_gpio_flags flags;

	struct input_dev *input;

	unsigned long gflags;

	int err;



	beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);

	if (!beep)

		return -ENOMEM;



	beep->gpio = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);

	if (!gpio_is_valid(beep->gpio))

		return beep->gpio;



	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);



	beep->active_low = flags & OF_GPIO_ACTIVE_LOW;

	gflags = beep->active_low ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;



	err = devm_gpio_request_one(&pdev->dev, beep->gpio, gflags, pdev->name);

	if (err)

		return err;



	input_set_drvdata(input, beep);



	return input_register_device(input);

}



static struct of_device_id gpio_beeper_of_match[] = {

	{ .compatible = BEEPER_MODNAME, },

	{ }

};

MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);



static struct platform_driver gpio_beeper_platform_driver = {

	.driver	= {

		.name		= BEEPER_MODNAME,

		.owner		= THIS_MODULE,

		.of_match_table	= 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");