1 files changed, 145 insertions, 0 deletions
diff --git a/board/chell/led.c b/board/chell/led.c
new file mode 100644
index 0000000000..51808e9071
--- /dev/null
+++ b/board/chell/led.c
@@ -0,0 +1,145 @@
+/* Copyright 2015 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Power and battery LED control.
+ */
+
+#include "battery.h"
+#include "charge_state.h"
+#include "chipset.h"
+#include "ec_commands.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "host_command.h"
+#include "led_common.h"
+#include "util.h"
+
+#define BAT_LED_ON 1
+#define BAT_LED_OFF 0
+
+const enum ec_led_id supported_led_ids[] = {
+			EC_LED_ID_BATTERY_LED};
+
+const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
+
+enum led_color {
+	LED_OFF = 0,
+	LED_AMBER,
+	LED_WHITE,
+	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_AMBER:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_OFF);
+		break;
+	case LED_WHITE:
+		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_YELLOW] = 1;
+	brightness_range[EC_LED_COLOR_WHITE] = 1;
+}
+
+int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+{
+	switch (led_id) {
+	case EC_LED_ID_BATTERY_LED:
+		if (brightness[EC_LED_COLOR_WHITE] != 0)
+			bat_led_set_color(LED_WHITE);
+		else if (brightness[EC_LED_COLOR_YELLOW] != 0)
+			bat_led_set_color(LED_AMBER);
+		else
+			bat_led_set_color(LED_OFF);
+		break;
+	default:
+		break;
+	}
+
+	return EC_SUCCESS;
+}
+
+static void board_led_set_battery(void)
+{
+	static int battery_ticks;
+	uint32_t chflags = charge_get_flags();
+	static int power_ticks;
+	static int previous_state_suspend;
+
+	battery_ticks++;
+	power_ticks++;
+
+	if (chipset_in_state(CHIPSET_STATE_ANY_SUSPEND)) {
+		/*
+		 * Reset ticks if entering suspend so LED turns white
+		 * as soon as possible.
+		 */
+		if (!previous_state_suspend)
+			power_ticks = 0;
+
+		if (charge_get_state() == PWR_STATE_CHARGE)
+			/* Always indicate when charging, even in suspend. */
+			bat_led_set_color(LED_AMBER);
+		else
+			/* Blink once every one second. */
+			bat_led_set_color((power_ticks & 0x4) ?
+					  LED_WHITE : LED_OFF);
+
+		previous_state_suspend = 1;
+		return;
+	}
+	previous_state_suspend = 0;
+
+	switch (charge_get_state()) {
+	case PWR_STATE_CHARGE:
+		bat_led_set_color(LED_AMBER);
+		break;
+	case PWR_STATE_DISCHARGE:
+		if (charge_get_percent() < 12)
+			bat_led_set_color(
+				(battery_ticks & 0x4) ? LED_WHITE : LED_OFF);
+		else
+			bat_led_set_color(LED_OFF);
+		break;
+	case PWR_STATE_ERROR:
+		bat_led_set_color((battery_ticks & 0x2) ? LED_WHITE : LED_OFF);
+		break;
+	case PWR_STATE_CHARGE_NEAR_FULL:
+		bat_led_set_color(LED_WHITE);
+		break;
+	case PWR_STATE_IDLE: /* External power connected in IDLE */
+		if (chflags & CHARGE_FLAG_FORCE_IDLE)
+			bat_led_set_color(
+				(battery_ticks & 0x4) ? LED_AMBER : LED_OFF);
+		else
+			bat_led_set_color(LED_WHITE);
+		break;
+	default:
+		/* Other states don't alter LED behavior */
+		break;
+	}
+}
+
+/* Called by hook task every TICK */
+static void led_tick(void)
+{
+	if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
+		board_led_set_battery();
+}
+DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);