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SubjectRe: [linux-pm] Re: [RFC] Some thoughts on device drivers and sysfs
On Tuesday 29 March 2005 00:03, Greg KH wrote:
> On Sun, Mar 27, 2005 at 02:24:59PM -0500, Adam Belay wrote:
> > One of the original design goals of sysfs was to provide a standardized
> > location to keep driver configuration attributes.  Although sysfs
> > handles this very well for bus devices and class devices, there isn't
> > currently a method to export attributes for device drivers and their
> > specific bound device instances to userspace.
> Hm, what's device_create_file(), device_remove_file(), and DEVICE_ATTR()
> for?  A number of drivers use these functions today to add their own
> driver specific attributes to a device they control.
> Then, userspace can just do a simple:
>         ls /sys/bus/pci/drivers/my_foo_driver/
> to see all devices on the PCI bus that are controlled by that driver.
> Then it can go into those directories and cat out the specific
> information if needed.

It probably would be nice if all driver-specific device attributes would be
grouped under /sys/devices/.../<blah_device>/drvattr/* so their names would
not clash with names of driver core attributes.

Unfortunately that would mean we are breaking userspace again...

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