Support controlling red LED strips on side of FS67xx devices

It's those red strips on the left and right side of the power button.
They're controlled by three GPIOs that are exposed as the new LEDs
red:side_inner, red:side_mid and red:side_outer

One of them was previously controlled by power:front_panel, but I
changed it so it's more consistent with the other two LEDs (LED pairs?)
of the strips

README.md

@@ -36,7 +36,7 @@ On many systems, ASUSTOR uses a mix of IT87 and CPU GPIOs to control leds and bu
 - AS6602T, AS6604T (NOT TESTED!)
 - AS6702T, AS6704T, AS6706T
 - AS5402T, AS5404T (NOT TESTED!)
-- FS6706T (NOT TESTED!), FS6712X
+- FS6706T, FS6712X
 - .. possibly more, if they're similar enough.
 
 The following DMI system-manufacturer / system-product-name combinations are currently supported

asustor_main.c

@@ -83,6 +83,9 @@ static struct gpio_led asustor_leds[] = {
 	DISK_ERR_LED("sata6"),                                            // 20
 	NVME_ACT_LED("nvme1"),                                            // 21
 	NVME_ERR_LED("nvme1"),                                            // 22
+	{ .name = "red:side_inner", .default_state = LEDS_GPIO_DEFSTATE_ON }, // 23
+	{ .name = "red:side_mid",   .default_state = LEDS_GPIO_DEFSTATE_ON }, // 24
+	{ .name = "red:side_outer", .default_state = LEDS_GPIO_DEFSTATE_ON }, // 25
 };
 
 static const struct gpio_led_platform_data asustor_leds_pdata = {
@@ -93,10 +96,8 @@ static const struct gpio_led_platform_data asustor_leds_pdata = {
 static struct gpiod_lookup_table asustor_fs6700_gpio_leds_lookup = {
 	.dev_id = "leds-gpio",
 	.table = {
-										// Red LEDs to the left and right of the
-										// power button on the side of the unit
-		GPIO_LOOKUP_IDX(GPIO_IT87, 52, NULL,  0, GPIO_ACTIVE_LOW),	// power:front_panel
-		// 1
+		// 0 - no front panel on this device
+		// 1 - no LCD either
 										// blue:power also controls the red LED
 										// inside the power button on the side
 		GPIO_LOOKUP_IDX(GPIO_IT87, 56, NULL,  2, GPIO_ACTIVE_LOW),	// blue:power
@@ -109,6 +110,10 @@ static struct gpiod_lookup_table asustor_fs6700_gpio_leds_lookup = {
 		// LEDs 9 - 20 don't exist in this system
 		GPIO_LOOKUP_IDX(GPIO_IT87, 12, NULL, 21, GPIO_ACTIVE_LOW),	// nvme1:green:disk
 		GPIO_LOOKUP_IDX(GPIO_IT87, 13, NULL, 22, GPIO_ACTIVE_LOW),	// nvme1:red:disk
+		// red LED strip next to the power button on the side
+		GPIO_LOOKUP_IDX(GPIO_IT87, 46, NULL, 23, GPIO_ACTIVE_LOW),	// red:side_inner
+		GPIO_LOOKUP_IDX(GPIO_IT87, 47, NULL, 24, GPIO_ACTIVE_LOW),	// red:side_mid
+		GPIO_LOOKUP_IDX(GPIO_IT87, 52, NULL, 25, GPIO_ACTIVE_LOW),	// red:side_outer
 		{}
 	},
 };