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intel: Add a helper for setting backlight without root rights

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Once the xserver stops running as root on kms capabable systems, we will need
some other way to access the backlight.

The approach taken in this patch moves most of the heavy lifting to a
helper that runs with root privileges and pipes our requested brightness
into the sysfs backlight interface. Where required, we use pkexec to
launch the helper with the elevated privilege.

v2: Amalgamate much more of the duplicate code.
    Keep the daemon and pipe alive for the lifetime of the backlight interface.
    Provide an alternative for systems without PolicyKit.

Signed-off-by: Hans de Goede <hdegoede@redhat.com> [v1]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2014-02-15 14:55:09 +00:00
parent a01548ccf1
commit 3d629c91cf
11 changed files with 560 additions and 411 deletions
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30
tools/Makefile.am
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@@ -20,23 +20,45 @@
AM_CFLAGS = \
@CWARNFLAGS@ \
$(TOOL_CFLAGS) \
@NOWARNFLAGS@ \
$(NULL)
drivermandir = $(DRIVER_MAN_DIR)
backlight_helperdir = $(prefix)/libexec
policydir = $(datarootdir)/polkit-1/actions
if BUILD_TOOLS
bin_PROGRAMS = intel-virtual-output
driverman_DATA = intel-virtual-output.$(DRIVER_MAN_SUFFIX)
endif
if BUILD_BACKLIGHT_HELPER
backlight_helper_PROGRAMS = xf86-video-intel-backlight-helper
nodist_policy_DATA = org.x.xf86-video-intel.backlight-helper.policy
backlight_helper = $(backlight_helperdir)/xf86-video-intel-backlight-helper
install-data-hook:
-chown root $(backlight_helper) && chmod u+s $(backlight_helper)
endif
intel_virtual_output_CFLAGS = \
@CWARNFLAGS@ \
$(TOOL_CFLAGS) \
@NOWARNFLAGS@ \
$(NULL)
intel_virtual_output_SOURCES = \
virtual.c \
$(NULL)
intel_virtual_output_LDADD = \
$(TOOL_LIBS) \
$(NULL)
intel_virtual_output_LDADD = $(TOOL_LIBS)
xf86_video_intel_backlight_helper_SOURCES = \
backlight_helper.c \
$(NULL)
EXTRA_DIST = intel-virtual-output.man
CLEANFILES = $(driverman_DATA)
EXTRA_DIST = intel-virtual-output.man org.x.xf86-video-intel.backlight-helper.policy.in
CLEANFILES = $(driverman_DATA) $(nodist_policy_DATA)
# String replacements in MAN_SUBSTS now come from xorg-macros.m4 via configure
SUFFIXES = .$(DRIVER_MAN_SUFFIX) .man