1 files changed, 121 insertions, 0 deletions
diff --git a/board/candy/led.c b/board/candy/led.c
new file mode 100644
index 0000000000..99c42a4efd
--- /dev/null
+++ b/board/candy/led.c
@@ -0,0 +1,121 @@
+/* Copyright (c) 2014 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 Candy
+ */
+
+#include "charge_state.h"
+#include "chipset.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "led_common.h"
+#include "pwm.h"
+#include "util.h"
+
+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_ORANGE,
+	LED_YELLOW,
+	LED_GREEN,
+
+	/* Number of colors, not a color itself */
+	LED_COLOR_COUNT
+};
+
+/* Brightness vs. color, for {red, green} LEDs */
+static const uint8_t color_brightness[LED_COLOR_COUNT][2] = {
+	{0, 0},
+	{100, 0},
+	{30, 45},
+	{20, 60},
+	{0, 100},
+};
+
+/**
+ * Set LED color
+ *
+ * @param color		Enumerated color value
+ */
+static void set_color(enum led_color color)
+{
+	pwm_set_duty(PWM_CH_LED_RED, color_brightness[color][0]);
+	pwm_set_duty(PWM_CH_LED_GREEN, color_brightness[color][1]);
+}
+
+void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
+{
+	brightness_range[EC_LED_COLOR_RED] = 100;
+	brightness_range[EC_LED_COLOR_GREEN] = 100;
+}
+
+int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+{
+	pwm_set_duty(PWM_CH_LED_RED, brightness[EC_LED_COLOR_RED]);
+	pwm_set_duty(PWM_CH_LED_GREEN, brightness[EC_LED_COLOR_GREEN]);
+	return EC_SUCCESS;
+}
+
+static void led_init(void)
+{
+	/* Configure GPIOs */
+	gpio_config_module(MODULE_PWM_LED, 1);
+
+	/*
+	 * Enable PWMs and set to 0% duty cycle.  If they're disabled, the LM4
+	 * seems to ground the pins instead of letting them float.
+	 */
+	pwm_enable(PWM_CH_LED_RED, 1);
+	pwm_enable(PWM_CH_LED_GREEN, 1);
+	set_color(LED_OFF);
+}
+DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_DEFAULT);
+
+/**
+ * Called by hook task every 250 ms
+ */
+static void led_tick(void)
+{
+	static unsigned ticks;
+	int chstate = charge_get_state();
+
+	ticks++;
+
+	/* If we don't control the LED, nothing to do */
+	if (!led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
+		return;
+
+	/* If charging error, blink orange, 25% duty cycle, 4 sec period */
+	if (chstate == PWR_STATE_ERROR) {
+		set_color((ticks % 16) < 4 ? LED_ORANGE : LED_OFF);
+		return;
+	}
+
+	/* If charge-force-idle, blink green, 50% duty cycle, 2 sec period */
+	if (chstate == PWR_STATE_IDLE &&
+	    (charge_get_flags() & CHARGE_FLAG_FORCE_IDLE)) {
+		set_color((ticks & 0x4) ? LED_GREEN : LED_OFF);
+		return;
+	}
+
+	/* If the system is charging, solid orange */
+	if (chstate == PWR_STATE_CHARGE) {
+		set_color(LED_ORANGE);
+		return;
+	}
+
+	/* If AC connected and fully charged (or close to it), solid green */
+	if (chstate == PWR_STATE_CHARGE_NEAR_FULL ||
+	    chstate == PWR_STATE_IDLE) {
+		set_color(LED_GREEN);
+		return;
+	}
+
+	/* Otherwise, system is off and AC not connected, LED off */
+	set_color(LED_OFF);
+}
+DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);