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Periodically set power LED

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It is possible that power LED goes off while AC still connected. Let's
set power LED periodically to aviod this problem.

BUG=chrome-os-partner:10386
TEST=Disconnect power LED while leave AC connected. Check LED goes off.
Connect LED again and check it comes back after few seconds.

Change-Id: I2a199446be5da772af8027b735b9f431f697bacd
Reviewed-on: https://gerrit.chromium.org/gerrit/29403
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Vic Yang <victoryang@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>
This commit is contained in:
Vic Yang
2012-08-06 22:12:38 +08:00
committed by Gerrit
parent dbc861c5f0
commit 687bd2cf39
1 changed files with 16 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
common/charge_state.c
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@@ -30,6 +30,9 @@
/* Voltage debounce time */
#define DEBOUNCE_TIME (10 * SECOND)
/* Time period between setting power LED */
#define SET_LED_PERIOD (10 * SECOND)
static const char * const state_name[] = POWER_STATE_NAME_TABLE;
static int state_machine_force_idle = 0;
@@ -548,6 +551,7 @@ void charge_state_machine_task(void)
uint8_t batt_flags;
enum powerled_color led_color = POWERLED_OFF;
int rv_setled = 0;
uint64_t last_setled_time = 0;
ctx->prev.state = PWR_STATE_INIT;
ctx->curr.state = PWR_STATE_INIT;
@@ -614,6 +618,7 @@ void charge_state_machine_task(void)
/* Charge done */
led_color = POWERLED_GREEN;
rv_setled = powerled_set(POWERLED_GREEN);
last_setled_time = get_time().val;
sleep_usec = POLL_PERIOD_LONG;
break;
@@ -633,6 +638,7 @@ void charge_state_machine_task(void)
/* Charging */
led_color = POWERLED_YELLOW;
rv_setled = powerled_set(POWERLED_YELLOW);
last_setled_time = get_time().val;
sleep_usec = POLL_PERIOD_CHARGE;
break;
@@ -640,6 +646,7 @@ void charge_state_machine_task(void)
/* Error */
led_color = POWERLED_RED;
rv_setled = powerled_set(POWERLED_RED);
last_setled_time = get_time().val;
sleep_usec = POLL_PERIOD_CHARGE;
break;
@@ -647,8 +654,16 @@ void charge_state_machine_task(void)
/* Don't change sleep duration */
if (state_machine_force_idle)
powerled_set(force_idle_led_blink());
else if (rv_setled)
else if (rv_setled || get_time().val - last_setled_time
> SET_LED_PERIOD) {
/*
* It is possible to make power LED go off
* without disconnecting AC. Therefore we
* need to reset power LED periodically.
*/
rv_setled = powerled_set(led_color);
last_setled_time = get_time().val;
}
break;
default:
/* Other state; poll quickly and hope it goes away */