diff options
| author | Divyanshu Jha <divyanshuj2006@gmail.com> | 2026-10-24 17:50:51 +0530 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-10-28 17:34:13 -0700 |
| commit | a8d0451967fc0a34c4b0c21368986a81b4e14862 (patch) | |
| tree | 6978f13d5ab64085c2fa0516e60ca1f441e18475 /drivers | |
| parent | 0de4e69cd021c99d0aa13e1f30aafd13ad74a2a5 (diff) | |
net: usb: cdc_ncm: add Apple Silicon MacBook Air (05ac:1903) device ID
The Apple Silicon MacBook Air exposes a CDC-NCM interface (05ac:1903)
when connected host-to-host over USB-C.
The device tested is an Apple MacBook Air (13-inch, M1, 2020), Model A2337
(MacBookAir10,1) with an Apple M1 chip. Unlike
commit a5148bc2fa27 ("net: usb: cdc_ncm: add Apple Mac USB-C direct networking quirk")
which hypothesized all Apple Silicon Macs share PID 0x1905 ("Mac"), this
M1 MacBook Air exposes PID 0x1903 with iProduct string "MacBook Air".
Like other Apple CDC-NCM peripherals (0x1902 and 0x1905), Apple's
firmware omits the CDC status interrupt endpoint. This causes the
standard cdc_ncm probe to fail with a missing endpoint error:
cdc_ncm 1-7:1.0: bind() failure
cdc_ncm: probe of 1-7:1.0 failed with error -22
Add device ID 05ac:1903 to cdc_devs binding to
apple_private_interface_info so the driver bypasses the interrupt
check and initializes host-to-host networking successfully:
cdc_ncm 1-7:1.0 usb0: register 'cdc_ncm' at usb-...,
CDC NCM (Apple Private), ...
Relevant 'lsusb -v' descriptor output:
Device Descriptor:
bcdUSB 2.10
idVendor 0x05ac Apple, Inc.
idProduct 0x1903 MacBook Air
bcdDevice 10.01
iManufacturer 1 Apple Inc.
iProduct 2 MacBook Air
Configuration Descriptor:
Interface Descriptor:
bInterfaceNumber 0
bInterfaceClass 2 Communications
bInterfaceSubClass 13 CDC NCM
bNumEndpoints 0
Interface Descriptor:
bInterfaceNumber 1
bInterfaceClass 10 CDC Data
bNumEndpoints 2
Interface Descriptor:
bInterfaceNumber 2
bInterfaceClass 2 Communications
bInterfaceSubClass 13 CDC NCM
bNumEndpoints 0
Interface Descriptor:
bInterfaceNumber 3
bInterfaceClass 10 CDC Data
bNumEndpoints 2
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Divyanshu Jha <divyanshuj2006@gmail.com>
Link: https://patch.msgid.link/20261024122051.14427-1-divyanshuj2006@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/cdc_ncm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 3bd7cb66f3fc..19db5a668dcb 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -2022,6 +2022,12 @@ static const struct usb_device_id cdc_devs[] = { { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1902, 2), .driver_info = (unsigned long)&apple_private_interface_info, }, + { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1903, 0), + .driver_info = (unsigned long)&apple_private_interface_info, + }, + { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1903, 2), + .driver_info = (unsigned long)&apple_private_interface_info, + }, { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1905, 0), .driver_info = (unsigned long)&apple_private_interface_info, }, |