105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
|
/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 and
|
||
|
|
* only version 2 as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* 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/gpio.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/of_gpio.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/suspend.h>
|
||
|
|
#include "smp2p_private.h"
|
||
|
|
|
||
|
|
#define SET_DELAY (2 * HZ)
|
||
|
|
#define PROC_AWAKE_ID 12 /* 12th bit */
|
||
|
|
static int slst_gpio_base_id;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* sleepstate_pm_notifier() - PM notifier callback function.
|
||
|
|
* @nb: Pointer to the notifier block.
|
||
|
|
* @event: Suspend state event from PM module.
|
||
|
|
* @unused: Null pointer from PM module.
|
||
|
|
*
|
||
|
|
* This function is register as callback function to get notifications
|
||
|
|
* from the PM module on the system suspend state.
|
||
|
|
*/
|
||
|
|
static int sleepstate_pm_notifier(struct notifier_block *nb,
|
||
|
|
unsigned long event, void *unused)
|
||
|
|
{
|
||
|
|
switch (event) {
|
||
|
|
case PM_SUSPEND_PREPARE:
|
||
|
|
gpio_set_value(slst_gpio_base_id + PROC_AWAKE_ID, 0);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case PM_POST_SUSPEND:
|
||
|
|
gpio_set_value(slst_gpio_base_id + PROC_AWAKE_ID, 1);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return NOTIFY_DONE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct notifier_block sleepstate_pm_nb = {
|
||
|
|
.notifier_call = sleepstate_pm_notifier,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int smp2p_sleepstate_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct device_node *node = pdev->dev.of_node;
|
||
|
|
|
||
|
|
slst_gpio_base_id = of_get_gpio(node, 0);
|
||
|
|
if (slst_gpio_base_id == -EPROBE_DEFER) {
|
||
|
|
return slst_gpio_base_id;
|
||
|
|
} else if (slst_gpio_base_id < 0) {
|
||
|
|
SMP2P_ERR("%s: Error to get gpio %d\n",
|
||
|
|
__func__, slst_gpio_base_id);
|
||
|
|
return slst_gpio_base_id;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
gpio_set_value(slst_gpio_base_id + PROC_AWAKE_ID, 1);
|
||
|
|
|
||
|
|
ret = register_pm_notifier(&sleepstate_pm_nb);
|
||
|
|
if (ret)
|
||
|
|
SMP2P_ERR("%s: power state notif error %d\n", __func__, ret);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct of_device_id msm_smp2p_slst_match_table[] = {
|
||
|
|
{.compatible = "qcom,smp2pgpio_sleepstate_3_out"},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct platform_driver smp2p_sleepstate_driver = {
|
||
|
|
.probe = smp2p_sleepstate_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "smp2p_sleepstate",
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.of_match_table = msm_smp2p_slst_match_table,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init smp2p_sleepstate_init(void)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
ret = platform_driver_register(&smp2p_sleepstate_driver);
|
||
|
|
if (ret) {
|
||
|
|
SMP2P_ERR("%s: smp2p_sleepstate_driver register failed %d\n",
|
||
|
|
__func__, ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(smp2p_sleepstate_init);
|
||
|
|
MODULE_DESCRIPTION("SMP2P SLEEP STATE");
|
||
|
|
MODULE_LICENSE("GPL v2");
|