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Commit 6d999718 authored by Sebastian Reichel's avatar Sebastian Reichel Committed by Lee Jones
Browse files

input: cpcap-pwrbutton: New driver 



Motorola CPCAP is a PMIC found in multiple smartphones.
This driver adds support for the power/on button and has
been tested in Droid 4.

Acked-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent ab781ec0

Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt

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Motorola CPCAP on key



This module is part of the CPCAP. For more details about the whole

chip see Documentation/devicetree/bindings/mfd/motorola-cpcap.txt.



This module provides a simple power button event via an Interrupt.



Required properties:

- compatible: should be one of the following

   - "motorola,cpcap-pwrbutton"

- interrupts: irq specifier for CPCAP's ON IRQ



Example:



&cpcap {

	cpcap_pwrbutton: pwrbutton {

		compatible = "motorola,cpcap-pwrbutton";

		interrupts = <23 IRQ_TYPE_NONE>;

	};

};

drivers/input/misc/Kconfig

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@@ -316,6 +316,16 @@ config INPUT_COBALT_BTNS 
	  To compile this driver as a module, choose M here: the

	  module will be called cobalt_btns.



config INPUT_CPCAP_PWRBUTTON

	tristate "CPCAP OnKey"

	depends on MFD_CPCAP

	help

	  Say Y here if you want to enable power key reporting via the

	  Motorola CPCAP chip.



	  To compile this driver as a module, choose M here. The module will

	  be called cpcap-pwrbutton.



config INPUT_WISTRON_BTNS

	tristate "x86 Wistron laptop button interface"

	depends on X86_32

drivers/input/misc/Makefile

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@@ -24,6 +24,7 @@ obj-$(CONFIG_INPUT_CM109) += cm109.o 
obj-$(CONFIG_INPUT_CMA3000)		+= cma3000_d0x.o

obj-$(CONFIG_INPUT_CMA3000_I2C)		+= cma3000_d0x_i2c.o

obj-$(CONFIG_INPUT_COBALT_BTNS)		+= cobalt_btns.o

obj-$(CONFIG_INPUT_CPCAP_PWRBUTTON)	+= cpcap-pwrbutton.o

obj-$(CONFIG_INPUT_DA9052_ONKEY)	+= da9052_onkey.o

obj-$(CONFIG_INPUT_DA9055_ONKEY)	+= da9055_onkey.o

obj-$(CONFIG_INPUT_DA9063_ONKEY)	+= da9063_onkey.o

drivers/input/misc/cpcap-pwrbutton.c

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/**

 * CPCAP Power Button Input Driver

 *

 * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>

 *

 * This file is subject to the terms and conditions of the GNU General

 * Public License. See the file "COPYING" in the main directory of this

 * archive for more details.

 *

 * 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/module.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/input.h>

#include <linux/interrupt.h>

#include <linux/regmap.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/mfd/motorola-cpcap.h>



#define CPCAP_IRQ_ON 23

#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))



struct cpcap_power_button {

	struct regmap *regmap;

	struct input_dev *idev;

	struct device *dev;

};



static irqreturn_t powerbutton_irq(int irq, void *_button)

{

	struct cpcap_power_button *button = _button;

	int val;



	val = cpcap_sense_virq(button->regmap, irq);

	if (val < 0) {

		dev_err(button->dev, "irq read failed: %d", val);

		return IRQ_HANDLED;

	}



	pm_wakeup_event(button->dev, 0);

	input_report_key(button->idev, KEY_POWER, val);

	input_sync(button->idev);



	return IRQ_HANDLED;

}



static int cpcap_power_button_probe(struct platform_device *pdev)

{

	struct cpcap_power_button *button;

	int irq = platform_get_irq(pdev, 0);

	int err;



	button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);

	if (!button)

		return -ENOMEM;



	button->idev = devm_input_allocate_device(&pdev->dev);

	if (!button->idev)

		return -ENOMEM;



	button->regmap = dev_get_regmap(pdev->dev.parent, NULL);

	if (!button->regmap)

		return -ENODEV;



	button->dev = &pdev->dev;



	button->idev->name = "cpcap-pwrbutton";

	button->idev->phys = "cpcap-pwrbutton/input0";

	button->idev->dev.parent = button->dev;

	input_set_capability(button->idev, EV_KEY, KEY_POWER);



	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,

		powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);

	if (err < 0) {

		dev_err(&pdev->dev, "IRQ request failed: %d\n", err);

		return err;

	}



	err = input_register_device(button->idev);

	if (err) {

		dev_err(&pdev->dev, "Input register failed: %d\n", err);

		return err;

	}



	device_init_wakeup(&pdev->dev, true);



	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {

	{ .compatible = "motorola,cpcap-pwrbutton" },

	{},

};

MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);

#endif



static struct platform_driver cpcap_power_button_driver = {

	.probe		= cpcap_power_button_probe,

	.driver		= {

		.name	= "cpcap-pwrbutton",

		.of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),

	},

};

module_platform_driver(cpcap_power_button_driver);



MODULE_ALIAS("platform:cpcap-pwrbutton");

MODULE_DESCRIPTION("CPCAP Power Button");

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");