kevin: Add support 3 color LED

When system on
 .always blue
When system is off
 .discharging : off
 .charging : red
 .full-charged : green
Error : red - green switching

BUG=None
TEST=See LED behavier on kevin

Change-Id: I93f0dbb503c68999825c455c8dc81b6bdaf397b4
Signed-off-by: Wonjoon Lee <woojoo.lee@samsung.com>
Reviewed-on: https://chromium-review.googlesource.com/341113
Reviewed-by: Shawn N <shawnn@chromium.org>

board/kevin/board.c

@@ -68,10 +68,10 @@ BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
 /******************************************************************************/
 /* PWM channels. Must be in the exactly same order as in enum pwm_channel. */
 const struct pwm_t pwm_channels[] = {
-	[PWM_CH_FULL_LED] = { 0, PWM_CONFIG_DSLEEP, 100 },
+	[PWM_CH_LED_GREEN] = { 0, PWM_CONFIG_DSLEEP, 100 },
 	[PWM_CH_BKLIGHT] =  { 2, 0, 10000 },
-	[PWM_CH_CHG_LED] =  { 3, PWM_CONFIG_DSLEEP, 100 },
-	[PWM_CH_PWR_LED] =  { 4, PWM_CONFIG_DSLEEP, 100 },
+	[PWM_CH_LED_RED] =  { 3, PWM_CONFIG_DSLEEP, 100 },
+	[PWM_CH_LED_BLUE] =  { 4, PWM_CONFIG_DSLEEP, 100 },
 };
 BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT);
 

board/kevin/board.h

@@ -14,6 +14,7 @@
 #define CONFIG_HOSTCMD_SPS
 #define CONFIG_POWER_COMMON
 #define CONFIG_PWM
+#define CONFIG_LED_COMMON
 
 #define CONFIG_SYSTEM_UNLOCKED /* Allow dangerous commands for testing */
 
@@ -111,10 +112,10 @@ enum adc_channel {
 };
 
 enum pwm_channel {
-	PWM_CH_FULL_LED,
+	PWM_CH_LED_GREEN,
 	PWM_CH_BKLIGHT,
-	PWM_CH_CHG_LED,
-	PWM_CH_PWR_LED,
+	PWM_CH_LED_RED,
+	PWM_CH_LED_BLUE,
 	/* Number of PWM channels */
 	PWM_CH_COUNT
 };

board/kevin/build.mk

@@ -11,5 +11,5 @@ CHIP:=npcx
 CHIP_VARIANT:=npcx5m5g
 
 board-y=battery.o
-board-y+=board.o
+board-y+=board.o led.o
 board-y+=usb_pd_policy.o

board/kevin/gpio.inc

@@ -127,11 +127,11 @@ ALTERNATE(PIN_MASK(8, 0x80), 1,  MODULE_I2C,           0)
 ALTERNATE(PIN_MASK(9, 0x07), 1,  MODULE_I2C,           0)
 /* I2C3SDA/I2C3SCL GPIOD0/D1    */
 ALTERNATE(PIN_MASK(D, 0x03), 1,  MODULE_I2C,           0)
-/* PWM0 / LED_FULL PWM2 / BLPWM */
+/* PWM0 / LED_GREEN(net LED_ACIN), PWM2 / BLPWM */
 ALTERNATE(PIN_MASK(C, 0x18), 1,  MODULE_PWM,           0)
-/* PWM3 / CHGLED */
+/* PWM3 / LED_RED(net LED_CHARGE) */
 ALTERNATE(PIN_MASK(8, 0x01), 1,  MODULE_PWM,           0)
-/* PWM4 / PWRLED */
+/* PWM4 / LED_BLUE(net LED_POWER) */
 ALTERNATE(PIN_MASK(B, 0x40), 1,  MODULE_PWM,           0)
 /* CR_SIN/SOUT GPIO64/65 */
 ALTERNATE(PIN_MASK(6, 0x30), 1,  MODULE_UART,          GPIO_PULL_UP)

board/kevin/led.c

@@ -0,0 +1,171 @@
+/* Copyright 2016 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/Battery LED control for Kevin
+ */
+
+#include "charge_state.h"
+#include "chipset.h"
+#include "console.h"
+#include "extpower.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "led_common.h"
+#include "pwm.h"
+#include "registers.h"
+#include "util.h"
+
+#define CPRINTF(format, args...) cprintf(CC_PWM, format, ## args)
+#define CPRINTS(format, args...) cprints(CC_PWM, format, ## args)
+
+#define LED_TOTAL_TICKS 16
+#define LED_ON_TICKS 8
+
+static int led_debug;
+
+const enum ec_led_id supported_led_ids[] = {
+	EC_LED_ID_POWER_LED, 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_GREEN,
+	LED_BLUE,
+
+	/* Number of colors, not a color itself */
+	LED_COLOR_COUNT
+};
+
+/* Brightness vs. color, in the order of off, red, green and blue */
+static const uint8_t color_brightness[LED_COLOR_COUNT][3] = {
+	/* {Red, Blue, Green}, */
+	[LED_OFF]   = {100, 100, 100},
+	[LED_RED]   = {90,  100, 100},
+	[LED_GREEN] = {100, 100, 80},
+	[LED_BLUE]  = {100, 80, 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_BLUE, color_brightness[color][1]);
+	pwm_set_duty(PWM_CH_LED_GREEN, color_brightness[color][2]);
+}
+
+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_BLUE] = 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_BLUE, brightness[EC_LED_COLOR_BLUE]);
+	pwm_set_duty(PWM_CH_LED_GREEN, brightness[EC_LED_COLOR_GREEN]);
+	return EC_SUCCESS;
+}
+
+static void kevin_led_set_power_battery(void)
+{
+	static int power_ticks;
+
+	if (chipset_in_state(CHIPSET_STATE_ON)) {
+		set_color(LED_BLUE);
+		return;
+	}
+
+	/* CHIPSET_STATE_OFF */
+	switch (charge_get_state()) {
+	case PWR_STATE_DISCHARGE:
+		set_color(LED_OFF);
+		break;
+	case PWR_STATE_CHARGE:
+		set_color(LED_RED);
+		break;
+	case PWR_STATE_ERROR:
+		power_ticks++;
+		set_color((power_ticks % LED_TOTAL_TICKS) \
+					< (LED_ON_TICKS) ? LED_RED : LED_GREEN);
+		break;
+	case PWR_STATE_CHARGE_NEAR_FULL:
+	case PWR_STATE_IDLE: /* External power connected in IDLE. */
+		set_color(LED_GREEN);
+		break;
+	default:
+		set_color(LED_RED);
+		break;
+	}
+	if ((charge_get_state()) != PWR_STATE_ERROR)
+		power_ticks = 0;
+}
+
+static void led_init(void)
+{
+	/*
+	 * Enable PWMs and set to 0% duty cycle.  If they're disabled,
+	 * seems to ground the pins instead of letting them float.
+	 */
+	pwm_enable(PWM_CH_LED_RED, 1);
+	pwm_enable(PWM_CH_LED_GREEN, 1);
+	pwm_enable(PWM_CH_LED_BLUE, 1);
+
+	set_color(LED_OFF);
+}
+/* After pwm_pin_init() */
+DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_INIT_PWM + 2);
+
+/**
+ * Called by hook task every 250 ms
+ */
+static void led_tick(void)
+{
+	if (led_debug)
+		return;
+
+	if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED) &&
+	    led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED)) {
+		kevin_led_set_power_battery();
+		return;
+	}
+
+	set_color(LED_OFF);
+}
+DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
+
+/******************************************************************/
+/* Console commands */
+static int command_led_color(int argc, char **argv)
+{
+	if (argc > 1) {
+		if (!strcasecmp(argv[1], "debug")) {
+			led_debug ^= 1;
+			CPRINTF("led_debug = %d\n", led_debug);
+		} else if (!strcasecmp(argv[1], "off")) {
+			set_color(LED_OFF);
+		} else if (!strcasecmp(argv[1], "red")) {
+			set_color(LED_RED);
+		} else if (!strcasecmp(argv[1], "green")) {
+			set_color(LED_GREEN);
+		} else if (!strcasecmp(argv[1], "blue")) {
+			set_color(LED_BLUE);
+		} else {
+			/* maybe handle charger_discharge_on_ac() too? */
+			return EC_ERROR_PARAM1;
+		}
+	}
+
+	return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(ledcolor, command_led_color,
+			"[debug|red|green|blue|off]",
+			"Change LED color",
+			NULL);