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Commit 56fb8de5 authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Anton Vorontsov
Browse files

power: reset: Add as3722 power-off driver 



ams AS3722 supports the power off functionality to turn off system.

This commit adds power off driver for ams AS3722.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Tested-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent 0c59cc7a

drivers/power/reset/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -6,6 +6,12 @@ menuconfig POWER_RESET 


	  Say Y here to enable board reset and power off



config POWER_RESET_AS3722

	bool "ams AS3722 power-off driver"

	depends on MFD_AS3722 && POWER_RESET

	help

	  This driver supports turning off board via a ams AS3722 power-off.



config POWER_RESET_GPIO

	bool "GPIO power-off driver"

	depends on OF_GPIO && POWER_RESET

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o

obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o

obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o

obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o

drivers/power/reset/as3722-poweroff.c

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+96 −0
Original line number Diff line number Diff line 
/*

 * Power off driver for ams AS3722 device.

 *

 * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.

 *

 * Author: Laxman Dewangan <ldewangan@nvidia.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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/mfd/as3722.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/slab.h>



struct as3722_poweroff {

	struct device *dev;

	struct as3722 *as3722;

};



static struct as3722_poweroff *as3722_pm_poweroff;



static void as3722_pm_power_off(void)

{

	int ret;



	if (!as3722_pm_poweroff) {

		pr_err("AS3722 poweroff is not initialised\n");

		return;

	}



	ret = as3722_update_bits(as3722_pm_poweroff->as3722,

		AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF);

	if (ret < 0)

		dev_err(as3722_pm_poweroff->dev,

			"RESET_CONTROL_REG update failed, %d\n", ret);

}



static int as3722_poweroff_probe(struct platform_device *pdev)

{

	struct as3722_poweroff *as3722_poweroff;

	struct device_node *np = pdev->dev.parent->of_node;



	if (!np)

		return -EINVAL;



	if (!of_property_read_bool(np, "ams,system-power-controller"))

		return 0;



	as3722_poweroff = devm_kzalloc(&pdev->dev, sizeof(*as3722_poweroff),

				GFP_KERNEL);

	if (!as3722_poweroff)

		return -ENOMEM;



	as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent);

	as3722_poweroff->dev = &pdev->dev;

	as3722_pm_poweroff = as3722_poweroff;

	if (!pm_power_off)

		pm_power_off = as3722_pm_power_off;



	return 0;

}



static int as3722_poweroff_remove(struct platform_device *pdev)

{

	if (pm_power_off == as3722_pm_power_off)

		pm_power_off = NULL;

	as3722_pm_poweroff = NULL;



	return 0;

}



static struct platform_driver as3722_poweroff_driver = {

	.driver = {

		.name = "as3722-power-off",

		.owner = THIS_MODULE,

	},

	.probe = as3722_poweroff_probe,

	.remove = as3722_poweroff_remove,

};



module_platform_driver(as3722_poweroff_driver);



MODULE_DESCRIPTION("Power off driver for ams AS3722 PMIC Device");

MODULE_ALIAS("platform:as3722-power-off");

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");

MODULE_LICENSE("GPL v2");