On Wed, 15 Feb 2006 13:24:28 +0530, Kaiwan N Billimoria wrote:
>
>
>Hello All,
>
>I am in the process of porting a 2.4 temperature sensor device driver (the National
>Semiconductor LM70CILD-3 temperature sensor eval board) to the 2.6 Linux kernel
>(specifically to v 2.6.15.3 <http://2.6.15.3>), with the intention of submitting it for inclusion.
>All ok, except this: am stuck on inserting an entry in /sys instead of /proc for the
>driver (as that is suggested as the new "correct" interface to userspace).
>
>I have read some documentation on sysfs and Rubini's lddbus example in
>the LDD3 book; however, i am still a little confused: do we really need
>to create a new /sys/bus/<driver_name> for each device inserted into
>the lernel at runtime? if (probably) not, where _exactly_ do i create
>my entry, and of course, _how _ exactly?
>
>FYI, my driver is a char driver and does not require a major/minor pair as the UI is via proc,
>and hopefully now, sysfs.
>(For those interested, pl find the source here: http://www.designergraphix.com/kaiwan/projects/lm70CILD3.c )
>
>So i guess what i'm also trying to say is this: as i don't require a major/minor pair, i'm abviously
>not using register_chrdev() or the cdev() interface..hence i don't have a kobject and auto-inclusion in
>the sysfs tree (isn't that right?). So... how exactly do i get my sysfs hooks in - as the
>device_create_file() API requires struct device and struct device_attribute parameters.
>
>Have any of you come across sample code/howto/tutorial out there that demonstrates just this (creating
>arbitrary sysfs hooks)? Request your help as i'm stuck here...(i also looked through
>Documentation/filesystems/sysfs.txt but was unable to properly map it to code... ).
>
>Perhaps, as the usual googling did not turn up a full-fledged howto on this topic, it's time for a
>knowledgeable person(s) out there to write one? I feel this would be v useful in the Documentation/ branch..
>Just a suggestion..
>
>TIA, kaiwan.
>
>
Hmmm...
I don't know if this'll really help, but have a look at
drivers/firmware/edd.c
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