Introduction

Bluetooth controller power-on driver and Bluetooth HCI driver are designed to support Bluetooth module.

Architecture

Bluetooth HCI driver architecture is summarized in the following figure.

../../_images/bluetooth_hci_driver_arch.svg

Implementation

Bluetooth Controller Power-on Driver

Realtek’s Bluetooth controller power-on driver is implemented in the following files:

Driver location	Introduction
<linux>/drivers/rtkdrivers/bluetooth/realtek-bt.c	Include Realtek’s Bluetooth controller power-on functions.

static int rtk_bt_cdev_set_power(struct rtk_bt_power_info *info)

Bluetooth HCI Driver

Original Bluetooth net are supported by Linux Bluetooth subsystem.

Bluetooth HCI UART driver is implemented in the following files:

Driver location	Introduction
<linux>/drivers/bluetooth/Kconfig	Bluetooth HCI driver Kconfig
<linux>/drivers/bluetooth/Makefile	Bluetooth HCI driver Makefile
<linux>/drivers/bluetooth/hci_h4.c	HCI UART proto funcitons.
<linux>/drivers/bluetooth/hci_ldisc.c	HCI UART TTY line discipline functions.
<linux>/drivers/bluetooth/rtk_coex.c	HCI UART co-existence handle functions.

Configuration

DTS Configuration

Bluetooth HCI Driver

UART3 is the special UART for Bluetooth. DTS node are defined in <dts>/rtl8730e-ocp.dtsi.

uart3: serial@41007000 {
   compatible = "realtek,ameba-uart";
   reg = <0x41007000 0x100>;
   clocks = <&rcc RTK_CKE_UART3>;
   interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;
};

Where:

compatible:: ID to match the driver and device, not configurable.
reg:: Register resource, not configurable.
clocks:: UART clock node, not configurable.
interrupts:: SPI interrupt, not configurable.

Build Configuration

Bluetooth Controller Power-on Driver

Select Device Drivers > Drivers for Realtek > Realtek bluetooth ioctl driver.

../../_images/bluetooth_build_configuration.png

Bluetooth OTP R/W Driver

Select Device Drivers > Drivers for Realtek > OTP driver.

Bluetooth HCI Driver

Select Networking support > Bluetooth subsystem support > Bluetooth device drivers > HCI UART driver.
Select Device Drivers > Drivers for Realtek > UART driver > General UART driver.