leogallego · February 6, 2021 18:22 · Sep 23, 2020 · Sep 23, 2020 · Sep 23, 2020 · Aug 4, 2020
diff --git a/readme.md b/readme.md
@@ -44,7 +44,7 @@ Change `master` for whatever version you are on if its different.
 
 Then apply the patch with
 ``` shell
-patch -p <  2-1-1-Bluetooth-btrtl-Add-support-for-RTL8761B.diff
+patch -p 1 <  2-1-1-Bluetooth-btrtl-Add-support-for-RTL8761B.diff
 ```
 and fix possible conflicts.
 

diff --git a/readme.md b/readme.md
@@ -4,7 +4,7 @@ The MPOW Bluetooth 5 dongle (Model: BH456A) does not work out of the box on Ubun
 
 ## Solution
 
-Patch the bluetooth kernel module and copy the firmware binaries to `/etc/firmware`.
+Patch the bluetooth kernel module and copy the firmware binaries to `/lib/firmware`.
 
 ## Copy the fimware
 

diff --git a/readme.md b/readme.md
@@ -24,8 +24,8 @@ and copy the firmware files to the appropriate system directory
 
 ``` shell
 SRCDIR="20200610_LINUX_BT_DRIVER/rtkbt-firmware/lib/firmware"
-sudo cp $SRCDIR/rtl8761bu_fw /etc/firmware/rtl_bt/rtl8761b_fw.bin
-sudo cp $SRCDIR/rtl8761bu_config /etc/firmware/rtl_bt/rtl8761b_config.bin
+sudo cp $SRCDIR/rtl8761bu_fw /lib/firmware/rtl_bt/rtl8761b_fw.bin
+sudo cp $SRCDIR/rtl8761bu_config /lib/firmware/rtl_bt/rtl8761b_config.bin
 ```
 
 ## Patch the bluetooth kernel module
@@ -36,7 +36,7 @@ For reference, I added the patch to this gist.
 To fix this, get the kernel source 
 
 ``` shell
-9865  git clone --depth 1 --single-branch --branch master git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git
+git clone --depth 1 --single-branch --branch master git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git
 ```
 
 for your ubuntu version.

diff --git a/readme.md b/readme.md
@@ -1,5 +1,3 @@
-# Install dirver and firmware
-
 ## Problem
 
 The MPOW Bluetooth 5 dongle (Model: BH456A) does not work out of the box on Ubuntu 20.04 (kernel 5.4.0-42).

diff --git a/readme.md b/readme.md
@@ -0,0 +1,88 @@
+# Install dirver and firmware
+
+## Problem
+
+The MPOW Bluetooth 5 dongle (Model: BH456A) does not work out of the box on Ubuntu 20.04 (kernel 5.4.0-42).
+
+## Solution
+
+Patch the bluetooth kernel module and copy the firmware binaries to `/etc/firmware`.
+
+## Copy the fimware
+
+MPOW hosts a linux driver on their homepage.
+Download it via:
+
+``` shell
+wget https://mpow.s3-us-west-1.amazonaws.com/mpow_MPBH456AB_driver+for+Linux.tgz
+```
+
+Extract the contents
+``` shell
+tar xvf mpow_MPBH456AB_driver+for+Linux.tgz
+```
+
+and copy the firmware files to the appropriate system directory
+
+``` shell
+SRCDIR="20200610_LINUX_BT_DRIVER/rtkbt-firmware/lib/firmware"
+sudo cp $SRCDIR/rtl8761bu_fw /etc/firmware/rtl_bt/rtl8761b_fw.bin
+sudo cp $SRCDIR/rtl8761bu_config /etc/firmware/rtl_bt/rtl8761b_config.bin
+```
+
+## Patch the bluetooth kernel module
+
+[This patch](https://patchwork.kernel.org/patch/11483367/) fixed a bug in the bluetooth module wrongly identifying the bluetooth chip as another version.
+For reference, I added the patch to this gist.
+
+To fix this, get the kernel source 
+
+``` shell
+9865  git clone --depth 1 --single-branch --branch master git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git
+```
+
+for your ubuntu version.
+Change `master` for whatever version you are on if its different.
+
+Then apply the patch with
+``` shell
+patch -p <  2-1-1-Bluetooth-btrtl-Add-support-for-RTL8761B.diff
+```
+and fix possible conflicts.
+
+Then its time to [build the bluetooth module](https://www.cnx-software.com/2015/03/06/how-to-build-a-single-kernel-module-driver-in-ubuntu/).
+
+First copy the old driver
+``` shell
+sudo cp -r /lib/modules/$(uname -r)/kernel/drivers/bluetooth
+/lib/modules/$(uname -r)/kernel/drivers/bluetooth_bak
+```
+
+Inside the cloned repository first get the current kernels config
+
+``` shell
+make oldconfig
+make prepare
+make scripts
+```
+
+and build the bluetooth module
+
+``` shell
+cd drivers/bluetooth
+make -C /lib/modules/$(uname -r)/build M=$(pwd) modules
+```
+
+and copy the `ko` module files to the systems module dir which we backed up before.
+
+``` shell
+sudo cp *.ko /lib/modules/$(uname -r)/kernel/drivers/bluetooth
+```
+
+This will overwrite the existing modules.
+Running `make install` didn't work for me because of a missing certification error.
+Probably the official Ubuntu kernel is signed.
+
+I don't have secure boot activated, so for we unsigned drivers work fine.
+
+Now reboot and everything should be fine.
diff --git a/v2-1-1-Bluetooth-btrtl-Add-support-for-RTL8761B.diff b/v2-1-1-Bluetooth-btrtl-Add-support-for-RTL8761B.diff
@@ -0,0 +1,33 @@
+diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
+index 67f4bc21e7c5..3a9afc905f24 100644
+--- a/drivers/bluetooth/btrtl.c
++++ b/drivers/bluetooth/btrtl.c
+@@ -130,12 +130,19 @@  static const struct id_table ic_id_table[] = {
+ 	  .cfg_name = "rtl_bt/rtl8821c_config" },
+
+ 	/* 8761A */
+-	{ IC_MATCH_FL_LMPSUBV, RTL_ROM_LMP_8761A, 0x0,
++	{ IC_INFO(RTL_ROM_LMP_8761A, 0xa),
+ 	  .config_needed = false,
+ 	  .has_rom_version = true,
+ 	  .fw_name  = "rtl_bt/rtl8761a_fw.bin",
+ 	  .cfg_name = "rtl_bt/rtl8761a_config" },
+
++	/* 8761B */
++	{ IC_INFO(RTL_ROM_LMP_8761A, 0xb),
++	  .config_needed = false,
++	  .has_rom_version = true,
++	  .fw_name  = "rtl_bt/rtl8761b_fw.bin",
++	  .cfg_name = "rtl_bt/rtl8761b_config" },
++
+ 	/* 8822C with UART interface */
+ 	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV |
+ 			 IC_MATCH_FL_HCIBUS,
+@@ -267,6 +274,7 @@  static int rtlbt_parse_firmware(struct hci_dev *hdev,
+ 		{ RTL_ROM_LMP_8723B, 9 },	/* 8723D */
+ 		{ RTL_ROM_LMP_8821A, 10 },	/* 8821C */
+ 		{ RTL_ROM_LMP_8822B, 13 },	/* 8822C */
++		{ RTL_ROM_LMP_8761A, 14 },	/* 8761B */
+ 	};
+
+ 	min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;