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/* Copyright (c) 2014-2017, 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 <linux/delay.h>
#include <linux/ipc_router.h>
#include "smp2p_private.h"
#define SET_DELAY (2 * HZ)
#define PROC_AWAKE_ID 12 /* 12th bit */
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:
msleep(25); /* To be tuned based on SMP2P latencies */
msm_ipc_router_set_ws_allowed(true);
break;
case PM_POST_SUSPEND:
msleep(25); /* To be tuned based on SMP2P latencies */
msm_ipc_router_set_ws_allowed(false);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block sleepstate_pm_nb = {
.notifier_call = sleepstate_pm_notifier,
.priority = INT_MAX,
};
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"},
{.compatible = "qcom,smp2pgpio-sleepstate-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");
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