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ec/google/chromeec: Add helper to set LED RGB colors

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This patch adds google_chromeec_set_lightbar_rgb() to allow mainboards
to manually control the individual LED colors. This is useful for
providing visual feedback during early boot or platform-specific
events, such as low-battery warnings.

TEST=Build and boot google/fatcat.

Change-Id: I146006511ea727787ea496b0674b67fa950ce8f2
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90807
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
This commit is contained in:
Subrata Banik 2026-01-20 16:19:18 +05:30
commit a7a627d8f5
2 changed files with 52 additions and 0 deletions
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36
src/ec/google/chromeec/ec.c
View file

@ -1945,3 +1945,39 @@ int google_chromeec_read_batt_state_of_charge(uint32_t *state)
return ret;
}
/*
* Set the RGB color of a specific LED on the Lightbar.
*
* This function communicates with the Embedded Controller (EC)
* to update the color of an individual LED.
*
* led: The index of the LED to be updated.
* red: Red intensity value (0x00 - 0xff).
* green: Green intensity value (0x00 - 0xff).
* blue: Blue intensity value (0x00 - 0xff).
* Return: 0 on success, or a non-zero error code from the EC host command.
*/
int google_chromeec_set_lightbar_rgb(unsigned int led, int red, int green,
int blue)
{
const struct ec_params_lightbar req = {
.cmd = LIGHTBAR_CMD_SET_RGB,
.set_rgb = {
.led = led,
.red = red,
.green = green,
.blue = blue
}
};
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);
}

16
src/ec/google/chromeec/ec.h
View file

@ -546,4 +546,20 @@ void chipset_ioport_range(uint16_t *base, size_t *size);
*/
int google_chromeec_read_batt_state_of_charge(uint32_t *state);
/*
* Set the RGB color of a specific LED on the Lightbar.
*
* This function communicates with the Embedded Controller (EC)
* to update the color of an individual LED.
*
* @param led: The index of the LED to be updated.
* @param red: Red intensity value (0x00 - 0xff).
* @param green: Green intensity value (0x00 - 0xff).
* @param blue: Blue intensity value (0x00 - 0xff).
*
* @return 0 on success, or a non-zero error code from the EC host command.
*/
int google_chromeec_set_lightbar_rgb(unsigned int led, int red, int green,
int blue);
#endif /* _EC_GOOGLE_CHROMEEC_EC_H */