toshiba_acpi: Only register backlight device when interface is read/write
authorSeth Forshee <seth.forshee@canonical.com>
Thu, 19 Apr 2012 16:23:50 +0000 (11:23 -0500)
committerMatthew Garrett <mjg@redhat.com>
Thu, 31 May 2012 18:26:04 +0000 (14:26 -0400)
commit62cce7526629e164513d3c67a06845953910f818
treeaedddfe36ac78f94466192a02e47502d65c974b6
parent20a769c1c6671d3b8d18a7358eff15e3dd29e94b
toshiba_acpi: Only register backlight device when interface is read/write

Currently the backlight device is registered unconditionally, but many
(probably most) Toshibas either don't support HCI_LCD_BRIGHTNESS or only
support reading from it. This patch adds a test of HCI_LCD_BRIGHTNESS
during initialization and only registers the backlight device if this
interface supports both reads and writes.

Cc: Akio Idehara <zbe64533@gmail.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
drivers/platform/x86/toshiba_acpi.c