ec: add initial coral related files

For now use the files from reef. To be changed later on.

BRANCH=none
BUG=b:38271615
TEST=emerge-coral chromeos-ec

Change-Id: Iff0a7b21b575d6394c27ff9959010496801fd056
Reviewed-on: https://chromium-review.googlesource.com/506117
Commit-Ready: YH Lin <yueherngl@chromium.org>
Tested-by: YH Lin <yueherngl@chromium.org>
Reviewed-by: Scott Collyer <scollyer@chromium.org>

1 files changed, 156 insertions, 0 deletions

diff --git a/board/coral/led.c b/board/coral/led.c
new file mode 100644
index 0000000000..ebca865b48
--- /dev/null
+++ b/board/coral/led.c
@@ -0,0 +1,156 @@
+/* Copyright 2016 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 for Coral
+ */
+
+#include "battery.h"
+#include "charge_state.h"
+#include "chipset.h"
+#include "ec_commands.h"
+#include "extpower.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "host_command.h"
+#include "led_common.h"
+#include "util.h"
+
+#define BAT_LED_ON 0
+#define BAT_LED_OFF 1
+
+#define CRITICAL_LOW_BATTERY_PERCENTAGE 3
+#define LOW_BATTERY_PERCENTAGE 10
+
+#define LED_TOTAL_4SECS_TICKS 4
+#define LED_TOTAL_2SECS_TICKS 2
+#define LED_ON_1SEC_TICKS 1
+#define LED_ON_2SECS_TICKS 2
+
+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_BLUE,
+	LED_AMBER,
+	LED_COLOR_COUNT  /* Number of colors, not a color itself */
+};
+
+static int led_set_color_battery(enum led_color color)
+{
+	switch (color) {
+	case LED_OFF:
+		gpio_set_level(GPIO_BAT_LED_BLUE, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_AMBER, BAT_LED_OFF);
+		break;
+	case LED_BLUE:
+		gpio_set_level(GPIO_BAT_LED_BLUE, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_AMBER, BAT_LED_OFF);
+		break;
+	case LED_AMBER:
+		gpio_set_level(GPIO_BAT_LED_BLUE, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_AMBER, 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_BLUE] = 1;
+	brightness_range[EC_LED_COLOR_AMBER] = 1;
+}
+
+static int led_set_color(enum ec_led_id led_id, enum led_color color)
+{
+	int rv;
+	switch (led_id) {
+	case EC_LED_ID_BATTERY_LED:
+		rv = 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_BLUE] != 0)
+		led_set_color(led_id, LED_BLUE);
+	else if (brightness[EC_LED_COLOR_AMBER] != 0)
+		led_set_color(led_id, LED_AMBER);
+	else
+		led_set_color(led_id, LED_OFF);
+
+	return EC_SUCCESS;
+}
+
+static void led_set_battery(void)
+{
+	static int battery_ticks;
+	static int suspend_ticks;
+
+	switch (charge_get_state()) {
+	case PWR_STATE_CHARGE:
+		led_set_color_battery(LED_AMBER);
+		break;
+	case PWR_STATE_DISCHARGE_FULL:
+		if (extpower_is_present()) {
+			led_set_color_battery(LED_BLUE);
+			break;
+		}
+		/* Intentional fall-through */
+	case PWR_STATE_DISCHARGE /* and PWR_STATE_DISCHARGE_FULL */:
+		if (chipset_in_state(CHIPSET_STATE_ON)) {
+			led_set_color_battery(LED_BLUE);
+		} else if (chipset_in_state(CHIPSET_STATE_SUSPEND |
+					    CHIPSET_STATE_STANDBY)) {
+			/* Blink once every four seconds. */
+			led_set_color_battery(
+				(suspend_ticks % LED_TOTAL_4SECS_TICKS)
+				< LED_ON_1SEC_TICKS ? LED_AMBER : LED_OFF);
+		} else {
+			led_set_color_battery(LED_OFF);
+		}
+		break;
+	case PWR_STATE_ERROR:
+		led_set_color_battery(
+			(battery_ticks % LED_TOTAL_2SECS_TICKS <
+			 LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
+		break;
+	case PWR_STATE_CHARGE_NEAR_FULL:
+		led_set_color_battery(LED_BLUE);
+		break;
+	case PWR_STATE_IDLE: /* External power connected in IDLE */
+		if (charge_get_flags() & CHARGE_FLAG_FORCE_IDLE)
+			led_set_color_battery(
+				(battery_ticks % LED_TOTAL_4SECS_TICKS <
+				 LED_ON_2SECS_TICKS) ? LED_AMBER : LED_BLUE);
+		else
+			led_set_color_battery(LED_BLUE);
+		break;
+	default:
+		/* Other states don't alter LED behavior */
+		break;
+	}
+	battery_ticks++;
+	suspend_ticks++;
+}
+
+/* Called by hook task every 1 sec */
+static void led_second(void)
+{
+	/*
+	 * Reference board only has one LED, so overload it to act as both
+	 * power LED and battery LED.
+	 */
+	if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
+		led_set_battery();
+}
+DECLARE_HOOK(HOOK_SECOND, led_second, HOOK_PRIO_DEFAULT);