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USB: ftdi_sio: do not claim CDC ACM function

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The Microchip vid:pid 04d8:000a is used for their CDC ACM
demo firmware application.  This is a device with a single
function conforming to the CDC ACM specification and with
the intention of demonstrating CDC ACM class firmware and
driver interaction.  The demo is used on a number of
development boards, and may also be used unmodified by
vendors using Microchip hardware.

Some vendors have re-used this vid:pid for other types of
firmware, emulating FTDI chips. Attempting to continue to
support such devices without breaking class based
applications that by matching on interface
class/subclass/proto being ff/ff/00.  I have no information
about the actual device or interface descriptors, but this
will at least make the proper CDC ACM devices work again.
Anyone having details of the offending device's descriptors
should update this entry with the details.

Reported-by: Florian Wöhrl <fw@woehrl.biz>
Reported-by: Xiaofan Chen <xiaofanc@gmail.com>
Cc: stable <stable@vger.kernel.org>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Bruno Thomsen <bruno.thomsen@gmail.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjørn Mork 2012-09-10 12:01:05 +02:00 committed by Greg Kroah-Hartman
parent 23649aa6f1
commit f08dea7348
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/usb/serial/ftdi_sio.c
View File

@ -805,7 +805,9 @@ static struct usb_device_id id_table_combined [] = {
.driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
{ USB_DEVICE(ADI_VID, ADI_GNICEPLUS_PID),
.driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
{ USB_DEVICE(MICROCHIP_VID, MICROCHIP_USB_BOARD_PID) },
{ USB_DEVICE_AND_INTERFACE_INFO(MICROCHIP_VID, MICROCHIP_USB_BOARD_PID,
USB_CLASS_VENDOR_SPEC,
USB_SUBCLASS_VENDOR_SPEC, 0x00) },
{ USB_DEVICE(JETI_VID, JETI_SPC1201_PID) },
{ USB_DEVICE(MARVELL_VID, MARVELL_SHEEVAPLUG_PID),
.driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },

5
drivers/usb/serial/ftdi_sio_ids.h
View File

@ -542,7 +542,10 @@
/*
* Microchip Technology, Inc.
*
* MICROCHIP_VID (0x04D8) and MICROCHIP_USB_BOARD_PID (0x000A) are also used by:
* MICROCHIP_VID (0x04D8) and MICROCHIP_USB_BOARD_PID (0x000A) are
* used by single function CDC ACM class based firmware demo
* applications. The VID/PID has also been used in firmware
* emulating FTDI serial chips by:
* Hornby Elite - Digital Command Control Console
* http://www.hornby.com/hornby-dcc/controllers/
*/