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Subject[PATCH v2] Documentation usb serial: fixed how to provide vendor and product id
Date
From: "H. Nikolaus Schaller" <hns@goldelico.com>

While trying to test a Cinterion GSM/GPS/3G module I had reconfigured
the USB interface by mistake and therefore needed to run a different
USB driver than CDC-ACM. It turned out that I need the "usbserial" driver.

This file is an official description how to use it: Documentation/usb/usb-serial.txt

But it is outdated. The parameters vendor= and product= are only available
if compiled as a kernel module and have been superseded by a /sys interface.

Here was the solution:

https://bbs.archlinux.org/viewtopic.php?id=175499

insmod usbserial vendor=0x#### product=0x####

becomes (first #### is vendor, second is product)

modprobe usbserial
echo #### #### >/sys/bus/usb-serial/drivers/generic/new_id

This patch changes the documentation file to describe the modern variant.
Please note that the old one still works (if compiled as module).

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Marek Belisko <marek@goldelico.com>
---

- fixed 2 sentences suggested by Johan Hovold

Documentation/usb/usb-serial.txt | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/Documentation/usb/usb-serial.txt b/Documentation/usb/usb-serial.txt
index 947fa62..349f310 100644
--- a/Documentation/usb/usb-serial.txt
+++ b/Documentation/usb/usb-serial.txt
@@ -465,12 +465,14 @@ Generic Serial driver
device, and does not support any kind of device flow control. All that
is required of your device is that it has at least one bulk in endpoint,
or one bulk out endpoint.
-
- To enable the generic driver to recognize your device, build the driver
- as a module and load it by the following invocation:
+
+ To enable the generic driver to recognize your device, provide
+ echo <vid> <pid> >/sys/bus/usb-serial/drivers/generic/new_id
+ where the <vid> and <pid> is replaced with the hex representation of your
+ device's vendor id and product id.
+ If the driver is compiled as a module you can also provide one id when
+ loading the module
insmod usbserial vendor=0x#### product=0x####
- where the #### is replaced with the hex representation of your device's
- vendor id and product id.

This driver has been successfully used to connect to the NetChip USB
development board, providing a way to develop USB firmware without
--
1.9.1


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