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Unbind Broadcom HCI driver on RPi/CM without WiFi (#4139)

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Unbind the Bluetooth driver for Broadcom HCI module before the bluetooth
service starts if running on board without WiFi module. This is a replacement
for #2948 but using a more targeted approach for removing the particular driver
and better detection of no-WiFi (thus no-Bluetooth) models.

This still means the driver will be probed and couple of lines printed when it
fails to set baudrate and reset the module, yet this should be benign, at least
the all-zero MAC device no longers appears in Bluetooth stack.

(cherry picked from commit aff1f81817)
This commit is contained in:
Jan Čermák
2025-07-02 17:07:36 +02:00
committed by Jan Čermák
parent 3c1aa91376
commit 2fb98a4a73
2 changed files with 15 additions and 0 deletions
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14
buildroot-external/package/pi-bluetooth/hciunbind.service Normal file
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@ -0,0 +1,14 @@
[Unit]
Description=Unbind Broadcom HCI driver if WiFi/Bluetooth module is not present
ConditionPathExists=!/sys/bus/sdio/devices/mmc1:0001:1
ConditionPathExists=/sys/bus/serial/drivers/hci_uart_bcm/unbind
ConditionPathExists=/proc/device-tree/chosen/rpi-boardrev-ext
Before=bluetooth.service
[Service]
Type=oneshot
ExecCondition=/bin/sh -c 'test $((16#$(xxd -p -g4 /proc/device-tree/chosen/rpi-boardrev-ext) & 16#40000000)) -gt 0'
ExecStart=/bin/sh -c 'echo "serial0-0" > /sys/bus/serial/drivers/hci_uart_bcm/unbind'
[Install]
WantedBy=hassos-hardware.target

1
buildroot-external/package/pi-bluetooth/pi-bluetooth.mk
View File

@ -12,6 +12,7 @@ PI_BLUETOOTH_LICENSE_FILES = debian/copyright
define PI_BLUETOOTH_INSTALL_TARGET_CMDS
$(INSTALL) -d $(TARGET_DIR)/etc/systemd/system/hassos-hardware.target.wants
$(INSTALL) -m 0644 $(BR2_EXTERNAL_HASSOS_PATH)/package/pi-bluetooth/hciuart.service $(TARGET_DIR)/usr/lib/systemd/system/
$(INSTALL) -m 0644 $(BR2_EXTERNAL_HASSOS_PATH)/package/pi-bluetooth/hciunbind.service $(TARGET_DIR)/usr/lib/systemd/system/
$(INSTALL) -m 0644 $(BR2_EXTERNAL_HASSOS_PATH)/package/pi-bluetooth/bthelper@.service $(TARGET_DIR)/usr/lib/systemd/system/
$(INSTALL) -d $(TARGET_DIR)/usr/bin