Glimmer: Implement the breathing led when suspend

The breathing led is gradual on in 1 second, gradual off in 1
second, and off for 3 seconds when system suspend.

BUG=chrome-os-partner:24647
BRANCH=glimmer
TEST=use command powerd_dbus_suspend, the led breathes normally.

Change-Id: I2c5d018ca2765eab4f86ddf7d1617edd4f955b5b
Signed-off-by: Henry Hsu <Henry.Hsu@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/186850
Reviewed-by: Dave Parker <dparker@chromium.org>

2 files changed, 43 insertions, 2 deletions

diff --git a/board/glimmer/board.h b/board/glimmer/board.h
index dc2dfdda1f..c7897b5e18 100644
--- a/board/glimmer/board.h
+++ b/board/glimmer/board.h
@@ -39,6 +39,7 @@
 #define CONFIG_POWER_BUTTON_IGNORE_LID
 #define CONFIG_POWER_BUTTON_X86
 #define CONFIG_PWM
+#define CONFIG_PWM_DSLEEP
 #define CONFIG_SCI_GPIO GPIO_PCH_SCI_L
 #define CONFIG_TEMP_SENSOR
 #define CONFIG_TEMP_SENSOR_TMP432
diff --git a/board/glimmer/led.c b/board/glimmer/led.c
index e3414bc5ff..e28d9bdf69 100644
--- a/board/glimmer/led.c
+++ b/board/glimmer/led.c
@@ -14,9 +14,14 @@
 #include "pwm.h"
 #include "util.h"
 
+#define TICKS_STEP1_BRIGHTER 0
+#define TICKS_STEP2_DIMMER 20
+#define TICKS_STEP3_OFF 40
+
 const enum ec_led_id supported_led_ids[] = {EC_LED_ID_POWER_LED};
 const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
 static int ac_in_blink_times;
+static int ticks;
 
 enum led_color {
 	LED_OFF = 0,
@@ -68,6 +73,41 @@ static void ac_in_blink(void)
 }
 DECLARE_HOOK(HOOK_AC_CHANGE, ac_in_blink, HOOK_PRIO_DEFAULT);
 
+static void suspend_led_update(void)
+{
+	int delay = 50 * MSEC;
+
+	ticks++;
+
+	/* 1s gradual on, 1s gradual off, 3s off */
+	if (ticks <= TICKS_STEP2_DIMMER) {
+		pwm_set_duty(PWM_CH_LED_RED, ticks*5);
+	} else if (ticks <= TICKS_STEP3_OFF) {
+		pwm_set_duty(PWM_CH_LED_RED, (TICKS_STEP3_OFF - ticks)*5);
+	} else {
+		ticks = TICKS_STEP1_BRIGHTER;
+		delay = 3000 * MSEC;
+	}
+
+	hook_call_deferred(suspend_led_update, delay);
+}
+DECLARE_DEFERRED(suspend_led_update);
+
+static void suspend_led_init(void)
+{
+	ticks = TICKS_STEP2_DIMMER;
+
+	hook_call_deferred(suspend_led_update, 0);
+}
+DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, suspend_led_init, HOOK_PRIO_DEFAULT);
+
+static void suspend_led_deinit(void)
+{
+	hook_call_deferred(suspend_led_update, -1);
+}
+DECLARE_HOOK(HOOK_CHIPSET_RESUME, suspend_led_deinit, HOOK_PRIO_DEFAULT);
+DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, suspend_led_deinit, HOOK_PRIO_DEFAULT);
+
 /**
  * Called by hook task every 250 ms
  */
@@ -87,8 +127,8 @@ static void led_tick(void)
 
 	/* If suspended, breathe the led */
 	if (chipset_in_state(CHIPSET_STATE_SUSPEND)) {
-		set_color(LED_OFF);
-	/* TODO keep led off now, will to be done in next CL */
+
+		/* Kept no function, use defered function instead. */
 		return;
 	}