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Commit 846a7fc8 authored by Moritz Fischer's avatar Moritz Fischer Committed by Dmitry Torokhov
Browse files

Input: add support for NI Ettus Research USRP E3x0 button 



Signed-off-by: default avatarMoritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent b388de88

Documentation/devicetree/bindings/input/e3x0-button.txt

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National Instruments Ettus Research USRP E3x0 button driver



This module is part of the NI Ettus Research USRP E3x0 SDR.



This module provides a simple power button event via two interrupts.



Required properties:

- compatible: should be one of the following

  - "ettus,e3x0-button": For devices such as the NI Ettus Research USRP E3x0

- interrupt-parent:

  - a phandle to the interrupt controller that it is attached to.

- interrupts: should be one of the following

  - <0 30 1>, <0 31 1>: For devices such as the NI Ettus Research USRP E3x0

- interrupt-names: should be one of the following

  - "press", "release": For devices such as the NI Ettus Research USRP E3x0



Note: Interrupt numbers might vary depending on the FPGA configuration.



Example:

	button {

		compatible = "ettus,e3x0-button";

		interrupt-parent = <&intc>;

		interrupts = <0 30 1>, <0 31 1>;

		interrupt-names = "press", "release";

	}

Documentation/devicetree/bindings/vendor-prefixes.txt

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@@ -48,6 +48,7 @@ epcos EPCOS AG 
epfl	Ecole Polytechnique Fédérale de Lausanne

epfl	Ecole Polytechnique Fédérale de Lausanne

epson	Seiko Epson Corp.

epson	Seiko Epson Corp.

est	ESTeem Wireless Modems

est	ESTeem Wireless Modems

ettus	NI Ettus Research

eukrea  Eukréa Electromatique

eukrea  Eukréa Electromatique

excito	Excito

excito	Excito

fsl	Freescale Semiconductor

fsl	Freescale Semiconductor

drivers/input/misc/Kconfig

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@@ -93,6 +93,16 @@ config INPUT_BMA150 
	  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 bma150.

	  module will be called bma150.





config INPUT_E3X0_BUTTON

	tristate "NI Ettus Research USRP E3x0 Button support."

	default n

	help

	  Say Y here to enable support for the NI Ettus Research

	  USRP E3x0 Button.



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

	  module will be called e3x0_button.



config INPUT_PCSPKR

config INPUT_PCSPKR

	tristate "PC Speaker support"

	tristate "PC Speaker support"

	depends on PCSPKR_PLATFORM

	depends on PCSPKR_PLATFORM

drivers/input/misc/Makefile

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@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o 
obj-$(CONFIG_INPUT_DA9052_ONKEY)	+= da9052_onkey.o

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_E3X0_BUTTON)		+= e3x0-button.o

obj-$(CONFIG_INPUT_DRV260X_HAPTICS)	+= drv260x.o

obj-$(CONFIG_INPUT_DRV260X_HAPTICS)	+= drv260x.o

obj-$(CONFIG_INPUT_DRV2667_HAPTICS)	+= drv2667.o

obj-$(CONFIG_INPUT_DRV2667_HAPTICS)	+= drv2667.o

obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o

obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o

drivers/input/misc/e3x0-button.c

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/*

 * Copyright (c) 2014, National Instruments Corp. All rights reserved.

 *

 * Driver for NI Ettus Research USRP E3x0 Button Driver

 *

 * 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; version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 */



#include <linux/device.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/input.h>

#include <linux/interrupt.h>

#include <linux/of.h>

#include <linux/slab.h>



static irqreturn_t e3x0_button_release_handler(int irq, void *data)

{

	struct input_dev *idev = data;



	input_report_key(idev, KEY_POWER, 0);

	input_sync(idev);



	return IRQ_HANDLED;

}



static irqreturn_t e3x0_button_press_handler(int irq, void *data)

{

	struct input_dev *idev = data;



	input_report_key(idev, KEY_POWER, 1);

	pm_wakeup_event(idev->dev.parent, 0);

	input_sync(idev);



	return IRQ_HANDLED;

}



static int __maybe_unused e3x0_button_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);



	if (device_may_wakeup(dev))

		enable_irq_wake(platform_get_irq_byname(pdev, "press"));



	return 0;

}



static int __maybe_unused e3x0_button_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);



	if (device_may_wakeup(dev))

		disable_irq_wake(platform_get_irq_byname(pdev, "press"));



	return 0;

}



static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,

			 e3x0_button_suspend, e3x0_button_resume);



static int e3x0_button_probe(struct platform_device *pdev)

{

	struct input_dev *input;

	int irq_press, irq_release;

	int error;



	irq_press = platform_get_irq_byname(pdev, "press");

	if (irq_press < 0) {

		dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n",

			irq_press);

		return irq_press;

	}



	irq_release = platform_get_irq_byname(pdev, "release");

	if (irq_release < 0) {

		dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n",

			irq_release);

		return irq_release;

	}



	input = devm_input_allocate_device(&pdev->dev);

	if (!input)

		return -ENOMEM;



	input->name = "NI Ettus Research USRP E3x0 Button Driver";

	input->phys = "e3x0_button/input0";

	input->dev.parent = &pdev->dev;



	input_set_capability(input, EV_KEY, KEY_POWER);



	error = devm_request_irq(&pdev->dev, irq_press,

				 e3x0_button_press_handler, 0,

				 "e3x0-button", input);

	if (error) {

		dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",

			irq_press, error);

		return error;

	}



	error = devm_request_irq(&pdev->dev, irq_release,

				 e3x0_button_release_handler, 0,

				 "e3x0-button", input);

	if (error) {

		dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",

			irq_release, error);

		return error;

	}



	error = input_register_device(input);

	if (error) {

		dev_err(&pdev->dev, "Can't register input device: %d\n", error);

		return error;

	}



	platform_set_drvdata(pdev, input);

	device_init_wakeup(&pdev->dev, 1);

	return 0;

}



static int e3x0_button_remove(struct platform_device *pdev)

{

	device_init_wakeup(&pdev->dev, 0);

	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id e3x0_button_match[] = {

	{ .compatible = "ettus,e3x0-button", },

	{ }

};

MODULE_DEVICE_TABLE(of, e3x0_button_match);

#endif



static struct platform_driver e3x0_button_driver = {

	.driver		= {

		.name	= "e3x0-button",

		.of_match_table = of_match_ptr(e3x0_button_match),

		.pm	= &e3x0_button_pm_ops,

	},

	.probe		= e3x0_button_probe,

	.remove		= e3x0_button_remove,

};



module_platform_driver(e3x0_button_driver);



MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");

MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");

MODULE_ALIAS("platform:e3x0-button");