GPIO Kernel Module

[Foxchild]

Code:

# CONFIG_PSI_DEFAULT_DISABLED is not set
CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y
CONFIG_MEMCG_SWAP_ENABLED=y
CONFIG_RODATA_FULL_DEFAULT_ENABLED=y
CONFIG_NETFILTER_XT_TARGET_LED=m
CONFIG_BT_LEDS=y
CONFIG_MAC80211_LEDS=y
CONFIG_RFKILL_LEDS=y
# CONFIG_LED_TRIGGER_PHY is not set
CONFIG_RT2X00_LIB_LEDS=y
CONFIG_INPUT_LEDS=y
# CONFIG_KEYBOARD_GPIO_POLLED is not set
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED=y
# CONFIG_BACKLIGHT_QCOM_WLED is not set
# CONFIG_HID_LED is not set
# CONFIG_USB_LED_TRIG is not set
# CONFIG_USB_LEDS_TRIGGER_USBPORT is not set
# Gadget/Dual-role mode requires USB Gadget support to be enabled
# CONFIG_USB_APPLEDISPLAY is not set
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
# CONFIG_LEDS_CLASS_FLASH is not set
# CONFIG_LEDS_BRIGHTNESS_HW_CHANGED is not set
# LED drivers
# CONFIG_LEDS_AN30259A is not set
# CONFIG_LEDS_BCM6328 is not set
# CONFIG_LEDS_BCM6358 is not set
# CONFIG_LEDS_CR0014114 is not set
# CONFIG_LEDS_EL15203000 is not set
# CONFIG_LEDS_LM3530 is not set
# CONFIG_LEDS_LM3532 is not set
# CONFIG_LEDS_LM3642 is not set
# CONFIG_LEDS_LM3692X is not set
# CONFIG_LEDS_PCA9532 is not set
CONFIG_LEDS_GPIO=y
# CONFIG_LEDS_LP3944 is not set
# CONFIG_LEDS_LP3952 is not set
# CONFIG_LEDS_LP5521 is not set
# CONFIG_LEDS_LP5523 is not set
# CONFIG_LEDS_LP5562 is not set
# CONFIG_LEDS_LP8501 is not set
# CONFIG_LEDS_LP8860 is not set
# CONFIG_LEDS_PCA955X is not set
# CONFIG_LEDS_PCA963X is not set
# CONFIG_LEDS_DAC124S085 is not set
CONFIG_LEDS_PWM=y
# CONFIG_LEDS_REGULATOR is not set
# CONFIG_LEDS_BD2802 is not set
# CONFIG_LEDS_LT3593 is not set
# CONFIG_LEDS_TCA6507 is not set
# CONFIG_LEDS_TLC591XX is not set
# CONFIG_LEDS_LM355x is not set
# CONFIG_LEDS_IS31FL319X is not set
# CONFIG_LEDS_IS31FL32XX is not set
# LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)
# CONFIG_LEDS_BLINKM is not set
CONFIG_LEDS_SYSCON=y
# CONFIG_LEDS_MLXREG is not set
# CONFIG_LEDS_USER is not set
# CONFIG_LEDS_SPI_BYTE is not set
# CONFIG_LEDS_TI_LMU_COMMON is not set
# LED Triggers
CONFIG_LEDS_TRIGGERS=y
# CONFIG_LEDS_TRIGGER_TIMER is not set
# CONFIG_LEDS_TRIGGER_ONESHOT is not set
CONFIG_LEDS_TRIGGER_DISK=y
# CONFIG_LEDS_TRIGGER_MTD is not set
CONFIG_LEDS_TRIGGER_HEARTBEAT=y
# CONFIG_LEDS_TRIGGER_BACKLIGHT is not set
CONFIG_LEDS_TRIGGER_CPU=y
# CONFIG_LEDS_TRIGGER_ACTIVITY is not set
# CONFIG_LEDS_TRIGGER_GPIO is not set
CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
# iptables trigger is under Netfilter config (LED target)
# CONFIG_LEDS_TRIGGER_TRANSIENT is not set
# CONFIG_LEDS_TRIGGER_CAMERA is not set
CONFIG_LEDS_TRIGGER_PANIC=y
# CONFIG_LEDS_TRIGGER_NETDEV is not set
# CONFIG_LEDS_TRIGGER_PATTERN is not set
# CONFIG_LEDS_TRIGGER_AUDIO is not set

/proc/config.gz shows quite some LED configs. so those are the modules that are built into the kernel already?
Is it possible to load and unload built-in kernel modules? In other words, would it be possible to write a new LED driver and unload the old one?