Fizz: Add LED control

This patch adds code to control the power LED.

BUG=b:37646390
BRANCH=none
TEST=Verify LED turns green, red, amber, off. Verify LED turns green
or off when chipset is on or off, respectively.

Change-Id: I1d7940d9bb4414d97c541ead802efeb8f279533e
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/486947

2 files changed, 112 insertions, 0 deletions

diff --git a/board/fizz/build.mk b/board/fizz/build.mk
index a45e41ff09..2ff420939e 100644
--- a/board/fizz/build.mk
+++ b/board/fizz/build.mk
@@ -12,3 +12,4 @@ CHIP_VARIANT:=npcx5m6g
 board-y=board.o
 board-$(CONFIG_BATTERY_SMART)+=battery.o
 board-$(CONFIG_USB_POWER_DELIVERY)+=usb_pd_policy.o
+board-y+=led.o
diff --git a/board/fizz/led.c b/board/fizz/led.c
new file mode 100644
index 0000000000..f22198fe7c
--- /dev/null
+++ b/board/fizz/led.c
@@ -0,0 +1,111 @@
+/* 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.
+ *
+ * Power and battery LED control for Fizz
+ */
+
+#include "chipset.h"
+#include "console.h"
+#include "ec_commands.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "led_common.h"
+#include "util.h"
+
+static int led_debug;
+
+enum led_color {
+	LED_OFF = 0,
+	LED_RED,
+	LED_GREEN,
+	LED_AMBER,
+
+	/* Number of colors, not a color itself */
+	LED_COLOR_COUNT
+};
+
+static int led_set_color_power(enum led_color color)
+{
+	int green = 0;
+	int red = 0;
+
+	switch (color) {
+	case LED_OFF:
+		break;
+	case LED_GREEN:
+		green = 1;
+		break;
+	case LED_RED:
+		red = 1;
+		break;
+	case LED_AMBER:
+		green = 1;
+		red = 1;
+		break;
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
+
+	gpio_set_level(GPIO_PWR_GRN_LED, green);
+	gpio_set_level(GPIO_PWR_RED_LED, red);
+
+	return EC_SUCCESS;
+}
+
+static int led_set_color(enum ec_led_id id, enum led_color color)
+{
+	switch (id) {
+	case EC_LED_ID_POWER_LED:
+		return led_set_color_power(color);
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
+}
+
+static void led_set_power(void)
+{
+	if (chipset_in_state(CHIPSET_STATE_ON)) {
+		led_set_color(EC_LED_ID_POWER_LED, LED_GREEN);
+		return;
+	}
+}
+
+/**
+ * Called by hook task every 250 ms
+ */
+static void led_tick(void)
+{
+	if (led_debug)
+		return;
+	led_set_power();
+}
+DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
+
+static int command_led(int argc, char **argv)
+{
+	enum ec_led_id id = EC_LED_ID_POWER_LED;
+
+	if (argc < 2)
+		return EC_ERROR_PARAM_COUNT;
+
+	if (!strcasecmp(argv[1], "debug")) {
+		led_debug ^= 1;
+		ccprintf("led_debug %s\n", led_debug ? "on" : "off");
+	} else if (!strcasecmp(argv[1], "off")) {
+		led_set_color(id, LED_OFF);
+	} else if (!strcasecmp(argv[1], "red")) {
+		led_set_color(id, LED_RED);
+	} else if (!strcasecmp(argv[1], "green")) {
+		led_set_color(id, LED_GREEN);
+	} else if (!strcasecmp(argv[1], "amber")) {
+		led_set_color(id, LED_AMBER);
+	} else {
+		/* maybe handle charger_discharge_on_ac() too? */
+		return EC_ERROR_PARAM1;
+	}
+	return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(led, command_led,
+			"[debug|red|green|amber|off]",
+			"Turn on/off LED");