This is a note to let you know that I've just added the patch titled
USB: ftdi_sio: do not claim CDC ACM function
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From f08dea734844aa42ec57c229b0b73b3d7d21f810 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= <[email protected]>
Date: Mon, 10 Sep 2012 12:01:05 +0200
Subject: USB: ftdi_sio: do not claim CDC ACM function
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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 <[email protected]>
Reported-by: Xiaofan Chen <[email protected]>
Cc: stable <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Bruno Thomsen <[email protected]>
Signed-off-by: Bjørn Mork <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/serial/ftdi_sio.c | 4 +++-
drivers/usb/serial/ftdi_sio_ids.h | 5 ++++-
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index e2fa788..f906b3a 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -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 },
diff --git a/drivers/usb/serial/ftdi_sio_ids.h
b/drivers/usb/serial/ftdi_sio_ids.h
index 9bcaf9c..41fe582 100644
--- a/drivers/usb/serial/ftdi_sio_ids.h
+++ b/drivers/usb/serial/ftdi_sio_ids.h
@@ -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/
*/
--
1.7.12.176.g3fc0e4c
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