fwk: led: add a function to change the LED duty

The LED driver does not support to runtime change the LED duty.
This change adds a function to change the LED duty.

BRANCH=fwk-tulip-29169
BUG=https://app.clickup.com/t/86eun47uq
TEST=create a hook second to call this function, and the LED duty
     can be changed.

Signed-off-by: Josh Tsai <Josh_Tsai@compal.com>

Author: Josh-Tsai

zephyr/program/framework/include/led.h

@@ -235,6 +235,16 @@ void auto_als_led_reset(void);
  */
 int led_get_current_tick_time(void);
 
+/**
+ * Allow the project changes the LED duty.
+ *
+ * @param color which LED color would like to change
+ * @param led_id which LED ID would like to change
+ * @param pins_count how many pwm pin to control the color
+ * @param duty the array of the duty that you want to change
+ */
+void led_change_color(enum led_color color, enum ec_led_id led_id, int pins_count, uint8_t *duty);
+
 #ifdef TEST_BUILD
 const struct led_pins_node_t *led_get_node(enum led_color color,
 					   enum ec_led_id led_id);

zephyr/program/framework/src/led_pwm.c

@@ -113,6 +113,36 @@ void led_set_color(enum led_color color, enum ec_led_id led_id)
 	}
 }
 
+const struct led_pins_node_t *led_get_node(enum led_color color, enum ec_led_id led_id)
+{
+	const struct led_pins_node_t *pin_node = NULL;
+
+	for (int i = 0; i < ARRAY_SIZE(pins_node); i++) {
+		if (pins_node[i]->led_id == led_id &&
+		    pins_node[i]->led_color == color) {
+			pin_node = pins_node[i];
+			break;
+		}
+	}
+
+	return pin_node;
+}
+
+void led_change_color(enum led_color color, enum ec_led_id led_id, int pins_count, uint8_t *duty)
+{
+	const struct led_pins_node_t *pin_node = led_get_node(color, led_id);
+	uint64_t pulse_ns;
+
+	if (pin_node->pins_count != pins_count)
+		LOG_ERR("LED change color: Wrong pins count");
+
+	for (int j = 0; j < pins_count; j++) {
+		pulse_ns = DIV_ROUND_NEAREST(BOARD_LED_PWM_PERIOD_NS * duty[j], 100);
+		pin_node->pwm_pins[j].pulse_ns = pulse_ns;
+	}
+
+}
+
 /*
  * Set value for exponential pulsing as a minimum of 10,
  * because 0 to the power of anything is still 0.