volteer: move the PWM configuration and LED support from baseboard to boards

Considering the LED circuits for the derived boards differ significantly
from Volteer and every OEM would have different requirements for LED
behavior. So move the PWM configuration and LED support from baseboard
(volteer) to board (halvor, malefor and volteer), there will be happy to
redefine LED behavior in boards.

BUG=b:154447182
BRANCH=none
TEST=make buildall

Signed-off-by: xiong.huang <xiong.huang@bitland.corp-partner.google.com>
Change-Id: I578459d4dd75abce4eed83e1f69a14886bb6a0f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2156688
Reviewed-by: Keith Short <keithshort@chromium.org>

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);