4 files changed, 168 insertions, 1 deletions
diff --git a/board/halvor/board.c b/board/halvor/board.c
index a242c2431d..8bf58af26a 100644
--- a/board/halvor/board.c
+++ b/board/halvor/board.c
@@ -17,6 +17,8 @@
 #include "lid_switch.h"
 #include "power.h"
 #include "power_button.h"
+#include "pwm.h"
+#include "pwm_chip.h"
 #include "switch.h"
 #include "system.h"
 #include "task.h"
@@ -29,7 +31,9 @@
 
 static void board_init(void)
 {
-	/* TODO */
+	/* Illuminate motherboard and daughter board LEDs equally to start. */
+	pwm_enable(PWM_CH_LED4_SIDESEL, 1);
+	pwm_set_duty(PWM_CH_LED4_SIDESEL, 50);
 }
 DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
 
@@ -114,6 +118,50 @@ const struct i2c_port_t i2c_ports[] = {
 };
 const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
 
+/* PWM configuration */
+const struct pwm_t pwm_channels[] = {
+	[PWM_CH_LED1_BLUE] = {
+		.channel = 2,
+		.flags = PWM_CONFIG_ACTIVE_LOW | PWM_CONFIG_DSLEEP,
+		.freq = 2400,
+	},
+	[PWM_CH_LED2_GREEN] = {
+		.channel = 0,
+		.flags = PWM_CONFIG_ACTIVE_LOW | PWM_CONFIG_DSLEEP,
+		.freq = 2400,
+	},
+	[PWM_CH_LED3_RED] = {
+		.channel = 1,
+		.flags = PWM_CONFIG_ACTIVE_LOW | PWM_CONFIG_DSLEEP,
+		.freq = 2400,
+	},
+	[PWM_CH_LED4_SIDESEL] = {
+		.channel = 7,
+		.flags = PWM_CONFIG_ACTIVE_LOW | PWM_CONFIG_DSLEEP,
+		/* Run at a higher frequency than the color PWM signals to avoid
+		 * timing-based color shifts.
+		 */
+		.freq = 4800,
+	},
+	[PWM_CH_FAN] = {
+		.channel = 5,
+		.flags = PWM_CONFIG_OPEN_DRAIN,
+		.freq = 25000
+	},
+	[PWM_CH_KBLIGHT] = {
+		.channel = 3,
+		.flags = 0,
+		/*
+		 * Set PWM frequency to multiple of 50 Hz and 60 Hz to prevent
+		 * flicker. Higher frequencies consume similar average power to
+		 * lower PWM frequencies, but higher frequencies record a much
+		 * lower maximum power.
+		 */
+		.freq = 2400,
+	},
+};
+BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT);
+
 /******************************************************************************/
 void halvor_tcpc_alert_event(enum gpio_signal signal)
 {
diff --git a/board/halvor/board.h b/board/halvor/board.h
index c10447dba4..2b1ef9b176 100644
--- a/board/halvor/board.h
+++ b/board/halvor/board.h
@@ -19,6 +19,11 @@
 #undef CONFIG_UART_TX_BUF_SIZE
 #define CONFIG_UART_TX_BUF_SIZE 4096
 
+/* LED defines */
+#define CONFIG_LED_PWM
+/* Although there are 2 LEDs, they are both controlled by the same lines. */
+#define CONFIG_LED_PWM_COUNT 1
+
 /* Keyboard features */
 
 /* Sensors */
@@ -114,6 +119,16 @@ enum battery_type {
 	BATTERY_TYPE_COUNT,
 };
 
+enum pwm_channel {
+	PWM_CH_LED1_BLUE = 0,
+	PWM_CH_LED2_GREEN,
+	PWM_CH_LED3_RED,
+	PWM_CH_LED4_SIDESEL,
+	PWM_CH_FAN,
+	PWM_CH_KBLIGHT,
+	PWM_CH_COUNT
+};
+
 enum sensor_id {
 	LID_ACCEL = 0,
 	CLEAR_ALS,
diff --git a/board/halvor/build.mk b/board/halvor/build.mk
index d9d20ff7c7..f16b1520c0 100644
--- a/board/halvor/build.mk
+++ b/board/halvor/build.mk
@@ -29,5 +29,6 @@ ENV_VARS := VOLTEER_POWER_SEQUENCE
 
 board-y=board.o
 board-y+=battery.o
+board-y+=led.o
 board-$(VOLTEER_POWER_SEQUENCE)+=power_sequence.o
 board-y+=sensors.o
diff --git a/board/halvor/led.c b/board/halvor/led.c
new file mode 100644
index 0000000000..4e99b66579
--- /dev/null
+++ b/board/halvor/led.c
@@ -0,0 +1,103 @@
+/* Copyright 2020 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 Halvor
+ */
+
+#include "charge_manager.h"
+#include "common.h"
+#include "ec_commands.h"
+#include "hooks.h"
+#include "led_common.h"
+#include "led_pwm.h"
+#include "pwm.h"
+
+const enum ec_led_id supported_led_ids[] = {
+	EC_LED_ID_POWER_LED,
+};
+const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
+
+struct pwm_led led_color_map[] = {
+				/* Red, Green, Blue */
+	[EC_LED_COLOR_RED] =    {  100,   0,     0 },
+	[EC_LED_COLOR_GREEN] =  {    0, 100,     0 },
+	[EC_LED_COLOR_BLUE] =   {    0,   0,   100 },
+	/* The green LED seems to be brighter than the others, so turn down
+	 * green from its natural level for these secondary colors.
+	 */
+	[EC_LED_COLOR_YELLOW] = {  100,  70,     0 },
+	[EC_LED_COLOR_WHITE] =  {  100,  70,   100 },
+	[EC_LED_COLOR_AMBER] =  {  100,  20,     0 },
+};
+
+struct pwm_led pwm_leds[] = {
+	/* 2 RGB diffusers controlled by 1 set of 3 channels. */
+	[PWM_LED0] = {
+		.ch0 = PWM_CH_LED3_RED,
+		.ch1 = PWM_CH_LED2_GREEN,
+		.ch2 = PWM_CH_LED1_BLUE,
+		.enable = &pwm_enable,
+		.set_duty = &pwm_set_duty,
+	},
+};
+
+void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
+{
+	brightness_range[EC_LED_COLOR_RED] = 255;
+	brightness_range[EC_LED_COLOR_GREEN] = 255;
+	brightness_range[EC_LED_COLOR_BLUE] = 255;
+}
+
+int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+{
+	enum pwm_led_id pwm_id;
+
+	/* Convert ec_led_id to pwm_led_id. */
+	if (led_id == EC_LED_ID_POWER_LED)
+		pwm_id = PWM_LED0;
+	else
+		return EC_ERROR_UNKNOWN;
+
+	if (brightness[EC_LED_COLOR_RED])
+		set_pwm_led_color(pwm_id, EC_LED_COLOR_RED);
+	else if (brightness[EC_LED_COLOR_GREEN])
+		set_pwm_led_color(pwm_id, EC_LED_COLOR_GREEN);
+	else if (brightness[EC_LED_COLOR_BLUE])
+		set_pwm_led_color(pwm_id, EC_LED_COLOR_BLUE);
+	else if (brightness[EC_LED_COLOR_YELLOW])
+		set_pwm_led_color(pwm_id, EC_LED_COLOR_YELLOW);
+	else if (brightness[EC_LED_COLOR_WHITE])
+		set_pwm_led_color(pwm_id, EC_LED_COLOR_WHITE);
+	else if (brightness[EC_LED_COLOR_AMBER])
+		set_pwm_led_color(pwm_id, EC_LED_COLOR_AMBER);
+	else
+		/* Otherwise, the "color" is "off". */
+		set_pwm_led_color(pwm_id, -1);
+
+	return EC_SUCCESS;
+}
+
+/* Illuminates the LED on the side of the active charging port. If not charging,
+ * illuminates both LEDs.
+ */
+static void led_set_charge_port_tick(void)
+{
+	int port;
+	int side_select_duty;
+
+	port = charge_manager_get_active_charge_port();
+	switch (port) {
+	case 0:
+		side_select_duty = 100;
+		break;
+	case 1:
+		side_select_duty = 0;
+		break;
+	default:
+		side_select_duty = 50;
+	}
+
+	pwm_set_duty(PWM_CH_LED4_SIDESEL, side_select_duty);
+}
+DECLARE_HOOK(HOOK_TICK, led_set_charge_port_tick, HOOK_PRIO_DEFAULT);