[Gta04-owner] [PATCH] Documentation: usb: serial: fixed how to provide vendor and product id
Dr. H. Nikolaus Schaller
hns at goldelico.com
Mon Mar 30 11:40:20 CEST 2015
Am 30.03.2015 um 11:32 schrieb Dr. H. Nikolaus Schaller <hns at goldelico.com>:
> Hi Johan,
>
> Am 30.03.2015 um 09:45 schrieb Johan Hovold <johan at kernel.org>:
>
>> On Sat, Mar 28, 2015 at 02:37:57PM +0100, Marek Belisko wrote:
>>> From: "H. Nikolaus Schaller" <hns at goldelico.com>
>>>
>>> While trying to test the Pyra GSM/GPS/3G module I had reconfigured
>>> the USB interface by mistake and therefore needed to run a different
>>> USB driver than CSC-ACM. It turned out that I need the "usbserial" driver.
>>
>> CDC-ACM
>
> oh, thanks. There is always at least one more typo in any document…
>
>>
>>> 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 But it is outdated.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 no longer
>>> available since ca. 3.12 which means that documentation is lagging behind
>>> quite some time.
>>
>> This is simply not true. The vendor and module parameters are still
>> there for usbserial (i.e. the generic driver).
>>
>> Would you mind updating this patch to document the sysfs-method as an
>> alternative instead? Using sysfs is preferred as that functionality can
>> be used with any usb-serial driver and the drivers can also be compiled
>> in.
>
> Hm. For me it did not work as described and therefore I searched for
> and found the solution cited below, which appears to confirm that it does
> not work any more. Only with these hints to use the /sys approach I
> could make it working immediately.
>
> Therefore I assumed that the documentation is outdated.
>
> But it might also be a hidden bug with the parameter passing.
> I had tested on 4.0-rc3.
>
> I can try a little more but it might be waste of time to find out why the old
> does not work, if there is a preferred method now.
>
>>
>>> 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 as needed.
>>>
>>> Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
>>> Signed-off-by: Marek Belisko <marek at goldelico.com>
>>> ---
>>> 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..9f184d8 100644
>>> --- a/Documentation/usb/usb-serial.txt
>>> +++ b/Documentation/usb/usb-serial.txt
>>> @@ -466,11 +466,13 @@ Generic Serial driver
>>> 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:
>>> - insmod usbserial vendor=0x#### product=0x####
>>> - where the #### is replaced with the hex representation of your device's
>>> - vendor id and product id.
>>> + To enable the generic driver to recognize your device, configure
>>> + USB_SERIAL_GENERIC=y and build the driver as a module. Then load it by the
>>
>> You don't need to build the driver as a module when using the sysfs
>> method.
>
> Ok, that is right and my formulation is too narrow on that.
Well, I should add that not my formulation was too narrow but already the original.
>
> So we just s/ as a module//.
>
>>
>>> + following invocation:
>>> + modprobe usbserial
>>> + echo #### #### >/sys/bus/usb-serial/drivers/generic/new_id
>>> + where the the first #### is replaced with the hex representation of your
>>> + device's vendor id and the second #### by the product id.
>>>
>>> This driver has been successfully used to connect to the NetChip USB
>>> development board, providing a way to develop USB firmware without
>>
>> Thanks,
>> Johan
>
> Thanks as well,
> Nikolaus
>
>
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