glados: Implement LED functionality on EC

Implement LED control for glados for both red and green LED.

BUG=chrome-os-partner:40848
BRANCH=none
TEST=Manually tested on glados with following commands:
     ectool led battery red
     ectool led battery green
     ectool led battery off

Change-Id: I1b4f8c8c8f26779a11185ea8bbc6536d1d7f97b1
Signed-off-by: Mike Hsieh <mike.m.hsieh@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/289439
Reviewed-by: Shawn N <shawnn@chromium.org>

2 files changed, 140 insertions, 3 deletions

diff --git a/board/glados/board.h b/board/glados/board.h
index ad5d8d35ee..bdbb7cb9d9 100644
--- a/board/glados/board.h
+++ b/board/glados/board.h
@@ -88,7 +88,9 @@
 #define WIRELESS_GPIO_WLAN GPIO_WLAN_OFF_L
 #define WIRELESS_GPIO_WLAN_POWER GPIO_PP3300_WLAN_EN
 
-
+/* LED signals */
+#define GPIO_BAT_LED_RED GPIO_CHARGE_LED_1
+#define GPIO_BAT_LED_GREEN GPIO_CHARGE_LED_2
 
 /* I2C ports */
 #ifdef GLADOS_BOARD_V1
diff --git a/board/glados/led.c b/board/glados/led.c
index a34cbb69fe..3d2300fddd 100644
--- a/board/glados/led.c
+++ b/board/glados/led.c
@@ -15,16 +15,151 @@
 #include "led_common.h"
 #include "util.h"
 
+#define BAT_LED_ON 1
+#define BAT_LED_OFF 0
+
+#define CRITICAL_LOW_BATTERY_PERCENTAGE 3
+#define LOW_BATTERY_PERCENTAGE 10
+
+#define LED_TOTAL_4SECS_TICKS 16
+#define LED_TOTAL_2SECS_TICKS 8
+#define LED_ON_1SEC_TICKS 4
+#define LED_ON_2SECS_TICKS 8
+
 const enum ec_led_id supported_led_ids[] = {
-	EC_LED_ID_POWER_LED, EC_LED_ID_BATTERY_LED};
+			EC_LED_ID_BATTERY_LED};
 
 const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
 
-int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+enum led_color {
+	LED_OFF = 0,
+	LED_RED,
+	LED_AMBER,
+	LED_GREEN,
+	LED_COLOR_COUNT  /* Number of colors, not a color itself */
+};
+
+static int bat_led_set_color(enum led_color color)
 {
+	switch (color) {
+	case LED_OFF:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_OFF);
+		break;
+	case LED_RED:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_OFF);
+		break;
+	case LED_AMBER:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_ON);
+		break;
+	case LED_GREEN:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_ON);
+		break;
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
 	return EC_SUCCESS;
 }
 
 void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
 {
+	brightness_range[EC_LED_COLOR_RED] = 1;
+	brightness_range[EC_LED_COLOR_GREEN] = 1;
+}
+
+static int glados_led_set_color_battery(enum led_color color)
+{
+	return bat_led_set_color(color);
+}
+
+static int glados_led_set_color(enum ec_led_id led_id, enum led_color color)
+{
+	int rv;
+
+	led_auto_control(led_id, 0);
+	switch (led_id) {
+	case EC_LED_ID_BATTERY_LED:
+		rv = glados_led_set_color_battery(color);
+		break;
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
+	return rv;
+}
+
+int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+{
+	if (brightness[EC_LED_COLOR_RED] != 0 &&
+	    brightness[EC_LED_COLOR_GREEN] != 0)
+	    glados_led_set_color(led_id, LED_AMBER);
+	else if (brightness[EC_LED_COLOR_RED] != 0)
+		glados_led_set_color(led_id, LED_RED);
+	else if (brightness[EC_LED_COLOR_GREEN] != 0)
+		glados_led_set_color(led_id, LED_GREEN);
+	else
+		glados_led_set_color(led_id, LED_OFF);
+
+	return EC_SUCCESS;
+}
+
+static void glados_led_set_battery(void)
+{
+	static int battery_ticks;
+	uint32_t chflags = charge_get_flags();
+
+	battery_ticks++;
+
+	/* BAT LED behavior:
+	 * Same as the chromeos spec
+	 * Green/Amber for CHARGE_FLAG_FORCE_IDLE
+	 */
+	switch (charge_get_state()) {
+	case PWR_STATE_CHARGE:
+		glados_led_set_color_battery(LED_AMBER);
+		break;
+	case PWR_STATE_DISCHARGE:
+		/* Less than 3%, blink one second every two second */
+		if (charge_get_percent() < CRITICAL_LOW_BATTERY_PERCENTAGE)
+			glados_led_set_color_battery(
+				(battery_ticks % LED_TOTAL_2SECS_TICKS <
+				 LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
+		/* Less than 10%, blink one second every four seconds */
+		else if (charge_get_percent() < LOW_BATTERY_PERCENTAGE)
+			glados_led_set_color_battery(
+				(battery_ticks % LED_TOTAL_4SECS_TICKS <
+				 LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
+		else
+			glados_led_set_color_battery(LED_OFF);
+		break;
+	case PWR_STATE_ERROR:
+		glados_led_set_color_battery(
+			(battery_ticks % LED_TOTAL_2SECS_TICKS <
+			 LED_ON_1SEC_TICKS) ? LED_RED : LED_OFF);
+		break;
+	case PWR_STATE_CHARGE_NEAR_FULL:
+		glados_led_set_color_battery(LED_GREEN);
+		break;
+	case PWR_STATE_IDLE: /* External power connected in IDLE */
+		if (chflags & CHARGE_FLAG_FORCE_IDLE)
+			glados_led_set_color_battery(
+				(battery_ticks % LED_TOTAL_4SECS_TICKS <
+				 LED_ON_2SECS_TICKS) ? LED_GREEN : LED_AMBER);
+		else
+			glados_led_set_color_battery(LED_GREEN);
+		break;
+	default:
+		/* Other states don't alter LED behavior */
+		break;
+	}
+}
+
+/** * Called by hook task every 1 sec  */
+static void led_second(void)
+{
+	if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
+		glados_led_set_battery();
 }
+DECLARE_HOOK(HOOK_SECOND, led_second, HOOK_PRIO_DEFAULT);