Date:	Mon, 30 Mar 2015 11:40:20 +0200
From:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
To:	List for communicating with real GTA04 owners 
	<gta04-owner@...delico.com>
Cc:	Johan Hovold <johan@...nel.org>, corbet@....net,
	linux-doc@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marek Belisko <marek@...delico.com>
Subject: Re: [Gta04-owner] [PATCH] Documentation: usb: serial: fixed how to provide vendor and product id


Am 30.03.2015 um 11:32 schrieb Dr. H. Nikolaus Schaller <hns@...delico.com>:

> Hi Johan,
> 
> Am 30.03.2015 um 09:45 schrieb Johan Hovold <johan@...nel.org>:
> 
>> On Sat, Mar 28, 2015 at 02:37:57PM +0100, Marek Belisko wrote:
>>> From: "H. Nikolaus Schaller" <hns@...delico.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 But it is outdated.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 Therefore I assumed that the documentation is outdated.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@...delico.com>
>>> Signed-off-by: Marek Belisko <marek@...delico.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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> Gta04-owner@...delico.com
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