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ec/google/chromeec: Add API to turn off lightbar

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Implement google_chromeec_lightbar_off() to allow the host to
explicitly disable the Chrome EC lightbar. This is achieved by
sending the LIGHTBAR_CMD_OFF sub-command via the multiplexed
EC_CMD_LIGHTBAR_CMD host command.

This API is useful for power-saving scenarios or UI synchronization
during specific boot modes, such as low-battery or off-mode charging.

BUG=None
TEST=Verified that the lightbar turns off when this function is
called on supported hardware.

Change-Id: Ic118dbd5e9af64d06490dd16aa115aca2c1df3a5
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91377
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Subrata Banik 2026-02-23 09:00:28 +05:30
commit 5f9a1ad962
2 changed files with 35 additions and 0 deletions
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25
src/ec/google/chromeec/ec.c
View file

@ -1982,6 +1982,31 @@ int google_chromeec_set_lightbar_rgb(unsigned int led, int red, int green,
return google_chromeec_command(&cmd);
}
/*
* Sends a command to turn off the Chrome EC lightbar.
*
* This function packages a LIGHTBAR_CMD_OFF sub-command into a standard
* EC_CMD_LIGHTBAR_CMD packet.
*
* @return 0 on success, non-zero error code from the EC transport on failure.
*/
int google_chromeec_lightbar_off(void)
{
const struct ec_params_lightbar req = {
.cmd = LIGHTBAR_CMD_OFF,
};
struct chromeec_command cmd = {
.cmd_code = EC_CMD_LIGHTBAR_CMD,
.cmd_size_out = 0,
.cmd_data_out = NULL,
.cmd_size_in = sizeof(req),
.cmd_data_in = &req,
};
return google_chromeec_command(&cmd);
}
/*
* Check if the battery is critically low and not currently charging.
*

10
src/ec/google/chromeec/ec.h
View file

@ -562,6 +562,16 @@ int google_chromeec_read_batt_state_of_charge(uint32_t *state);
int google_chromeec_set_lightbar_rgb(unsigned int led, int red, int green,
int blue);
/*
* Sends a command to turn off the Chrome EC lightbar.
*
* This function packages a LIGHTBAR_CMD_OFF sub-command into a standard
* EC_CMD_LIGHTBAR_CMD packet.
*
* @return 0 on success, non-zero error code from the EC transport on failure.
*/
int google_chromeec_lightbar_off(void);
/*
* Check if the battery is critically low and AC is not present.
*