mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
56fb8de53e
ams AS3722 supports the power off functionality to turn off system. This commit adds power off driver for ams AS3722. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
|
|
* 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");
|