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Matthias Kaehlcke d55c028f8b backlight: Expose brightness curve type through sysfs 
Backlight brightness curves can have different shapes. The two main
types are linear and non-linear curves. The human eye doesn't
perceive linearly increasing/decreasing brightness as linear (see
also 88ba95bedb "backlight: pwm_bl: Compute brightness of LED
linearly to human eye"), hence many backlights use non-linear (often
logarithmic) brightness curves. The type of curve currently is opaque
to userspace, so userspace often uses more or less reliable heuristics
(like the number of brightness levels) to decide whether to treat a
backlight device as linear or non-linear.

Export the type of the brightness curve via the new sysfs attribute
'scale'. The value of the attribute can be 'linear', 'non-linear' or
'unknown'. For devices that don't provide information about the scale
of their brightness curve the value of the 'scale' attribute is 'unknown'.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2019-09-02 15:55:03 +01:00
..
ABI backlight: Expose brightness curve type through sysfs 2019-09-02 15:55:03 +01:00
accounting docs: add some documentation dirs to the driver-api book 2019-07-15 11:03:02 -03:00
acpi/dsd docs: fix broken documentation links 2019-06-08 13:42:13 -06:00
admin-guide xen: fixes and features for 5.3-rc1 2019-07-19 11:41:26 -07:00
arm docs: arm: fix a breakage with pdf output 2019-07-15 11:03:04 -03:00
arm64 docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
auxdisplay docs: admin-guide: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
block docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
bpf Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
cdrom docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
core-api docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
cpu-freq docs: power: convert docs to ReST and rename to *.rst 2019-06-14 16:08:36 -05:00
crypto crypto: doc - Fix formatting of new crypto engine content 2019-07-03 22:13:12 +08:00
dev-tools Remove references to dead website. 2019-07-19 12:22:04 -07:00
devicetree dt-bindings: pinctrl: stm32: Fix missing 'clocks' property in examples 2019-07-20 20:28:53 -06:00
doc-guide Doc : doc-guide : Fix a typo 2019-06-28 09:04:14 -06:00
driver-api New feature to add support for NTB virtual MSI interrupts, the ability 2019-07-21 09:46:59 -07:00
EDID docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
fault-injection docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
fb docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
features Documentation/stackprotector: powerpc supports stack protector 2019-06-14 14:44:43 -06:00
filesystems Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-21 10:09:43 -07:00
firmware_class
firmware-guide docs: gpio: add sysfs interface to the admin-guide 2019-07-15 11:03:03 -03:00
fpga docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
gpu drm main pull request for v5.3-rc1 (sans mm changes) 2019-07-15 19:04:27 -07:00
hid docs: add some documentation dirs to the driver-api book 2019-07-15 11:03:02 -03:00
hwmon docs: driver-model: move it to the driver-api book 2019-07-15 11:03:02 -03:00
i2c Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-07-15 21:10:39 -07:00
ia64 docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
ide docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
iio docs: add some documentation dirs to the driver-api book 2019-07-15 11:03:02 -03:00
infiniband docs: infiniband: add it to the driver-api bookset 2019-07-08 14:22:56 -03:00
input docs: hid: convert to ReST 2019-07-02 10:19:34 +02:00
ioctl docs: ioctl: add it to the uAPI guide 2019-07-15 09:20:28 -03:00
isdn isdn: remove isdn4linux 2019-05-31 11:13:10 +02:00
kbuild Kbuild updates for v5.3 (2nd) 2019-07-20 09:34:55 -07:00
kernel-hacking docs: locking: convert docs to ReST and rename to *.rst 2019-07-15 08:53:27 -03:00
leds docs: leds: add it to the driver-api book 2019-07-15 09:20:28 -03:00
livepatch docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
locking docs: locking: add it to the main index 2019-07-15 11:03:03 -03:00
m68k docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
maintainer docs: Add a document on repository management 2019-06-18 09:33:16 -06:00
media media: doc-rst: Fix typos 2019-06-27 07:35:47 -04:00
mic docs: driver-api: add remaining converted dirs to it 2019-07-15 11:03:03 -03:00
mips
misc-devices docs: misc-devices: convert files without extension to ReST 2019-07-03 21:09:41 +02:00
netlabel docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
networking Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-07-19 10:06:06 -07:00
nios2
openrisc
parisc
PCI Documentation: PCI: convert endpoint/pci-test-howto.txt to reST 2019-05-30 17:54:34 -05:00
pcmcia docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
power More power management updates for 5.3-rc1 2019-07-18 09:32:28 -07:00
powerpc docs: admin-guide: add kdump documentation into it 2019-07-15 11:03:01 -03:00
process docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
RCU It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
riscv RISC-V updates for v5.3 2019-07-18 12:26:59 -07:00
s390 docs: don't use nested tables 2019-07-15 11:03:04 -03:00
scheduler docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
scsi scsi: ufs: Documentation: Announce ufs-tool v1.0 2019-06-26 22:47:51 -04:00
security docs: security: move some books to it and update 2019-07-15 11:03:01 -03:00
sh
sound
sparc docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
sphinx docs: automarkup.py: ignore exceptions when seeking for xrefs 2019-07-08 14:35:47 -06:00
sphinx-static
spi
target docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
thermal docs: thermal: convert to ReST 2019-06-27 21:22:15 +08:00
timers docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
trace The main changes in this release include: 2019-07-18 11:51:00 -07:00
translations Remove references to dead website. 2019-07-19 12:22:04 -07:00
usb docs: usb: rename files to .rst and add them to drivers-api 2019-06-20 14:28:36 +02:00
userspace-api docs: ocxl.rst: add it to the uAPI book 2019-07-15 11:03:02 -03:00
virtual KVM: x86: Add fixed counters to PMU filter 2019-07-20 09:00:48 +02:00
vm mm: document ZONE_DEVICE memory-model implications 2019-07-18 17:08:07 -07:00
w1 docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
watchdog linux-watchdog 5.3-rc1 tag 2019-07-18 10:47:59 -07:00
wimax
x86 docs: admin-guide: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
xtensa docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
.gitignore
atomic_bitops.txt
atomic_t.txt Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 16:12:03 -07:00
bus-virt-phys-mapping.txt
Changes
CodingStyle
conf.py Disable Sphinx SmartyPants in HTML output 2019-06-30 15:30:34 -06:00
COPYING-logo docs: logo.txt: rename it to COPYING-logo 2019-07-15 09:20:27 -03:00
crc32.txt
debugging-modules.txt
debugging-via-ohci1394.txt
digsig.txt
DMA-API-HOWTO.txt docs: DMA-API-HOWTO.txt: fix an unmarked code block 2019-07-15 09:20:24 -03:00
DMA-API.txt Documentation: DMA-API: fix a function name of max_mapping_size 2019-06-07 11:10:33 -06:00
DMA-attributes.txt
DMA-ISA-LPC.txt
docutils.conf doc-rst: Add missing newline at end of file 2019-06-20 14:16:56 -06:00
dontdiff kbuild: create *.mod with full directory path and remove MODVERDIR 2019-07-18 02:19:31 +09:00
futex-requeue-pi.txt
hwspinlock.txt hwspinlock: add the 'in_atomic' API 2019-06-29 21:08:14 -07:00
index.rst docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
io_ordering.txt
io-mapping.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
Kconfig docs: Kbuild/Makefile: allow check for missing docs at build time 2019-06-07 11:33:16 -06:00
kobject.txt
kprobes.txt
kref.txt
logo.gif
lzo.txt
mailbox.txt
Makefile docs: Kbuild/Makefile: allow check for missing docs at build time 2019-06-07 11:33:16 -06:00
memory-barriers.txt It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
nommu-mmap.txt
packing.txt
padata.txt
percpu-rw-semaphore.txt
pi-futex.txt docs: locking: convert docs to ReST and rename to *.rst 2019-07-15 08:53:27 -03:00
preempt-locking.txt
rbtree.txt docs: rbtree.txt: fix Sphinx build warnings 2019-07-15 09:20:24 -03:00
remoteproc.txt remoteproc: add vendor resources handling 2019-06-29 12:02:17 -07:00
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
speculation.txt
static-keys.txt
SubmittingPatches
tee.txt Documentation: tee: Grammar s/the its/its/ 2019-06-07 11:23:38 -06:00
this_cpu_ops.txt
unaligned-memory-access.txt
xz.txt