scarlet: add LED behavior

Amber: charging
Green: fully charged
Red: battery error
Off: no power adapter connected

BUG=chrome-os-partner:62207, b:62307687
CQ-DEPEND=CL:524977
BRANCH=gru
TEST=manually on rev0 board

Change-Id: I4b1ee85ae65b221f7199bf6cc245668de23546a9
Reviewed-on: https://chromium-review.googlesource.com/442365
Reviewed-by: Shawn N <shawnn@chromium.org>
Commit-Queue: Philip Chen <philipchen@chromium.org>
Tested-by: Philip Chen <philipchen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/524980
Commit-Ready: Philip Chen <philipchen@chromium.org>
Reviewed-by: Philip Chen <philipchen@chromium.org>

1 files changed, 129 insertions, 0 deletions

diff --git a/board/scarlet/led.c b/board/scarlet/led.c
new file mode 100644
index 0000000000..0062b0bb41
--- /dev/null
+++ b/board/scarlet/led.c
@@ -0,0 +1,129 @@
+/* Copyright 2017 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.
+ *
+ * Battery LED control for Scarlet board.
+ */
+
+#include "battery.h"
+#include "charge_state.h"
+#include "chipset.h"
+#include "hooks.h"
+#include "led_common.h"
+#include "lid_switch.h"
+#include "pwm.h"
+#include "util.h"
+
+/* LEDs on Scarlet are active low. */
+#define BAT_LED_ON 0
+#define BAT_LED_OFF 1
+
+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_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_GREEN, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_OFF);
+		break;
+	case LED_RED:
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		break;
+	case LED_AMBER:
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		break;
+	case LED_GREEN:
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_OFF);
+		break;
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
+	return EC_SUCCESS;
+}
+
+static void scarlet_led_set_battery(void)
+{
+	static int battery_second;
+	uint32_t chflags = charge_get_flags();
+
+	battery_second++;
+
+	switch (charge_get_state()) {
+	case PWR_STATE_CHARGE:
+		bat_led_set_color(LED_AMBER);
+		break;
+	case PWR_STATE_DISCHARGE:
+		if (charge_get_percent() < 3)
+			bat_led_set_color((battery_second & 1)
+					? LED_OFF : LED_AMBER);
+		else if (charge_get_percent() < 10)
+			bat_led_set_color((battery_second & 3)
+					? LED_OFF : LED_AMBER);
+		else if (charge_get_percent() >= BATTERY_LEVEL_NEAR_FULL &&
+		    (chflags & CHARGE_FLAG_EXTERNAL_POWER))
+			bat_led_set_color(LED_GREEN);
+		else
+			bat_led_set_color(LED_OFF);
+		break;
+	case PWR_STATE_ERROR:
+		bat_led_set_color(LED_RED);
+		break;
+	case PWR_STATE_CHARGE_NEAR_FULL:
+		bat_led_set_color(LED_GREEN);
+		break;
+	case PWR_STATE_IDLE: /* External power connected in IDLE. */
+		if (chflags & CHARGE_FLAG_FORCE_IDLE)
+			bat_led_set_color(
+				(battery_second & 0x2) ? LED_GREEN : LED_AMBER);
+		else
+			bat_led_set_color(LED_GREEN);
+		break;
+	default:
+		/* Other states don't alter LED behavior */
+		break;
+	}
+}
+
+void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
+{
+	if (led_id == EC_LED_ID_BATTERY_LED) {
+		brightness_range[EC_LED_COLOR_RED] = 1;
+		brightness_range[EC_LED_COLOR_GREEN] = 1;
+	}
+}
+
+int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+{
+	if (led_id == EC_LED_ID_BATTERY_LED) {
+		gpio_set_level(GPIO_BAT_LED_RED,
+			       (brightness[EC_LED_COLOR_RED] != 0) ?
+				BAT_LED_ON : BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_GREEN,
+			       (brightness[EC_LED_COLOR_GREEN] != 0) ?
+				BAT_LED_ON : BAT_LED_OFF);
+		return EC_SUCCESS;
+	}
+	return EC_ERROR_UNKNOWN;
+}
+
+/* Called by hook task every 1 sec */
+static void led_second(void)
+{
+	if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
+		scarlet_led_set_battery();
+}
+DECLARE_HOOK(HOOK_SECOND, led_second, HOOK_PRIO_DEFAULT);