[libhid-discuss] Talking to an HID device from user account in Linux

[Sarah Mount]

2009/4/2 Ali Asad <Asad.Ali at gemalto.com>:
>

<snip>

>
> I am now looking for a 'seamless' way for the end-users of this device to apply this udev rule on their Linux systems. They do this once and on each subsequent use the application works from use account. I can have my application write the rules file to /etc/udev/rules.d directory but for this I would need root access. What is the best way for a C application to ask user to type the root password and then use it to gain root access. Once this is done, the application can then write the rules file.
>

If you are using Makefiles, then store the udev rule in the source
distribution of your program and copy it to /etc/wherever as part of
the "INSTALL" target in the makefile. Usually 'make install' is run as
root or with sudo.

Sarah

> -----Original Message-----
> From: libhid-discuss-bounces+asad.ali=gemalto.com at lists.alioth.debian.org [mailto:libhid-discuss-bounces+asad.ali=gemalto.com at lists.alioth.debian.org] On Behalf Of Xiaofan Chen
> Sent: Tuesday, March 31, 2009 12:15 AM
> To: libhid-discuss at lists.alioth.debian.org
> Subject: Re: [libhid-discuss] Talking to an HID device from user account in Linux
>
> On Tue, Mar 31, 2009 at 12:47 PM, Peter Stuge <stuge-libhid at cdy.org> wrote:
>>> This technique would be orthogonal to the approach of using libhid
>>> to create our own device driver, but I want to explore all options.
>>
>> Then you could also look into hiddev and/or hidraw. They can be used
>> to communicate with HID devices at a higher level than USB.
>>
>> CONFIG_HID_DEV /usr/src/linux/Documentation/usb/hiddev.txt
>> CONFIG_HIDRAW http://cateee.net/lkddb/web-lkddb/HIDRAW.html (brief)
>>
>> hiddev may come with restrictions on which non-HID-class things your
>> device can do however - but still worth looking into.
>
> You may still need to write a udev rule even if you use the hiddev
> or hidraw interface unless the system has already udev rules
> in place.
>
> I am not familiar with hiddev but there is an example here.
> http://openprog.altervista.org/OP_eng.html
>
> Last time it is said that hiddev is not a good option for generic
> HID device but hidraw might be an option.
> http://osdir.com/ml/lib.libusb.devel.general/2007-04/msg00233.html
>
> Xiaofan
>
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Sarah Mount, Senior Lecturer, University of Wolverhampton
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