This patch adds a debug switch to enable (little) diagnostic
output, to help to trace down the remaining problems.
Signed-off-by: NMario Schwalbe <schwalbe@inf.tu-dresden.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRichard Purdie <rpurdie@linux.intel.com>

This patch adds support for the new Apple models incorporating an Nvidia
chipset.  Apple still uses the same protocol as on older models, but the
registers moved to a different address. To do this, two sets of functions
are added for the Intel/Nvidia chipset models and passed by the DMI_MATCH
function.

The initial code has been contributed by Hu Gang <hugang@soulinfo.com>.

The driver is known to work on MacBook Pro 3, MacBook Pro 4 and MacBook
Pro 5.

Its known to work with limitations on MacBook 5 / MacBook Air 2. Changing
brightness within X doesn't work, if using Nvidia's proprietary graphics
driver with no known fix at present. Changing brightness on a text console
or using the open-source driver does work.

MacBook Pro 5 has a known bug where the initial brightness after bootup is
the last recently used brightness (in Mac OSX), while the firmware reports
maximum. Impossible to fix.

[akpm@linux-foundation.org: build fix]
[rpurdie@linux.intel.com: Rebased the patch against latest git]
Signed-off-by: NMario Schwalbe <schwalbe@inf.tu-dresden.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRichard Purdie <rpurdie@linux.intel.com>

Add suspend/resume support to the backlight core and enable use of it
by appropriate drivers.
Signed-off-by: NRichard Purdie <rpurdie@linux.intel.com>

Use new MODULE_DEVICE_TABLE(dmi, ...) facility. There's no need for
every driver to screw it up for themselves, when the alias can be
generated automatically.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Nvidia-based Apple Macbook Pros don't appear to handle backlight control
through the graphics card registers or ACPI, but instead trigger changes
via SMI calls. This driver registers a generic backlight device that
lets existing userspace deal with it. Code derived from Julien Blache's
Pommed application.
Signed-off-by: NJulien Blache <jb@jblache.org>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Signed-off-by: NRichard Purdie <rpurdie@rpsys.net>