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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "console.h"
#include "extpower.h"
#include "hooks.h"
#include "host_command.h"
#include "system.h"
#include "util.h"
#include <zephyr/init.h>
#include <zephyr/logging/log.h>
#include <ap_power/ap_power.h>
#include <ap_power/ap_power_interface.h>
LOG_MODULE_DECLARE(ap_pwrseq, CONFIG_AP_PWRSEQ_LOG_LEVEL);
/*
* Hibernate processing.
*
* When enabled, the system will be put into an extreme low
* power state after the AP is in G3 for a configurable period of time,
* and there is no external power connected (i.e on battery).
*
* The delay has a configurable default, and may be set dynamically
* via a host command, or an EC console command. A typical delay
* may be 1 hour (3600 seconds).
*
* AP events such as AP_POWER_HARD_OFF are listened for, and
* a timer is used to detect when the AP has been off for the
* selected delay time. If the AP is started again, the timer is canceled.
* Once the timer expires, the system_hibernate() function is called,
* and this will suspend the EC until a wake signal is received.
*/
static uint32_t hibernate_delay = CONFIG_HIBERNATE_DELAY_SEC;
/*
* Return true if conditions are right for hibernation.
*/
static inline bool ready_to_hibernate(void)
{
return ap_power_in_or_transitioning_to_state(AP_POWER_STATE_HARD_OFF) &&
!extpower_is_present();
}
/*
* The AP has been off for the delay period, so hibernate the system,
* if ready. Called from system work queue.
*/
static void hibernate_handler(struct k_work *unused)
{
if (ready_to_hibernate()) {
LOG_INF("System hibernating due to %d seconds AP off",
hibernate_delay);
system_hibernate(0, 0);
}
}
K_WORK_DEFINE(hibernate_work, hibernate_handler);
/*
* Hibernate timer handler.
* Called when timer has expired.
* Schedule hibernate_handler to run via system work queue.
*/
static void timer_handler(struct k_timer *timer)
{
k_work_submit(&hibernate_work);
}
K_TIMER_DEFINE(hibernate_timer, timer_handler, NULL);
/*
* A change has been detected in either the AP state or the
* external power supply.
*/
static void change_detected(void)
{
if (ready_to_hibernate()) {
/*
* AP is off, and there is no external power.
* Start the timer if it is not already running.
*/
if (k_timer_remaining_get(&hibernate_timer) == 0) {
k_timer_start(&hibernate_timer,
K_SECONDS(hibernate_delay), K_NO_WAIT);
}
} else {
/*
* AP is either on, or external power is on.
* Either way, no hibernation is done.
* Make sure the timer is not running.
*/
k_timer_stop(&hibernate_timer);
}
}
static void ap_change(struct ap_power_ev_callback *callback,
struct ap_power_ev_data data)
{
change_detected();
}
/*
* Hook to listen for external power supply changes.
*/
DECLARE_HOOK(HOOK_AC_CHANGE, change_detected, HOOK_PRIO_DEFAULT);
/*
* EC Console command to get/set the hibernation delay
*/
static int command_hibernation_delay(int argc, const char **argv)
{
char *e;
uint32_t remaining;
if (argc >= 2) {
uint32_t s = strtoi(argv[1], &e, 0);
if (*e)
return EC_ERROR_PARAM1;
hibernate_delay = s;
}
/* Print the current setting */
ccprintf("Hibernation delay: %d s\n", hibernate_delay);
remaining = k_timer_remaining_get(&hibernate_timer);
if (remaining == 0) {
ccprintf("Timer not running\n");
} else {
ccprintf("Time remaining: %d s\n", remaining / 1000);
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(hibdelay, command_hibernation_delay, "[sec]",
"Set the delay before going into hibernation");
/*
* Host command to set the hibernation delay
*/
static enum ec_status
host_command_hibernation_delay(struct host_cmd_handler_args *args)
{
const struct ec_params_hibernation_delay *p = args->params;
struct ec_response_hibernation_delay *r = args->response;
/* Only change the hibernation delay if seconds is non-zero. */
if (p->seconds)
hibernate_delay = p->seconds;
r->hibernate_delay = hibernate_delay;
/*
* It makes no sense to try and set these values since
* they are only valid when the AP is in G3 (so this
* host command will never be called at that point).
*/
r->time_g3 = 0;
r->time_remaining = 0;
args->response_size = sizeof(struct ec_response_hibernation_delay);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_HIBERNATION_DELAY, host_command_hibernation_delay,
EC_VER_MASK(0));
static int hibernate_init(const struct device *unused)
{
static struct ap_power_ev_callback cb;
ap_power_ev_init_callback(&cb, ap_change,
AP_POWER_INITIALIZED | AP_POWER_HARD_OFF |
AP_POWER_STARTUP);
ap_power_ev_add_callback(&cb);
return 0;
}
SYS_INIT(hibernate_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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