Enric Balletbo i Serra
88ba95bedb
backlight: pwm_bl: Compute brightness of LED linearly to human eye
...
When you want to change the brightness using a PWM signal, one thing you
need to consider is how human perceive the brightness. Human perceive
the brightness change non-linearly, we have better sensitivity at low
luminance than high luminance, so to achieve perceived linear dimming,
the brightness must be matches to the way our eyes behave. The CIE 1931
lightness formula is what actually describes how we perceive light.
This patch computes a default table with the brightness levels filled
with the numbers provided by the CIE 1931 algorithm, the number of the
brightness levels is calculated based on the PWM resolution.
The calculation of the table using the CIE 1931 algorithm is enabled by
default when you do not define the 'brightness-levels' propriety in your
device tree.
Signed-off-by: Enric Balletbo i Serra <[email protected] >
Acked-by: Daniel Thompson <[email protected] >
Signed-off-by: Lee Jones <[email protected] >
2018-07-04 10:31:18 +01:00
..
accessibility
acpi
pwm: Changes for v4.18-rc1
2018-06-14 16:25:43 +09:00
amba
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
2018-06-06 13:49:25 -07:00
android
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
ata
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
atm
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
auxdisplay
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
base
Additional power management updates for 4.18-rc1
2018-06-13 07:24:18 -07:00
bcma
block
The main piece is a set of libceph changes that revamps how OSD
2018-06-15 07:24:58 +09:00
bluetooth
bus
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
cdrom
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
char
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
clk
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
clocksource
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
connector
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2018-06-06 18:39:49 -07:00
cpufreq
Additional power management updates for 4.18-rc1
2018-06-13 07:24:18 -07:00
cpuidle
powerpc updates for 4.18
2018-06-07 10:23:33 -07:00
crypto
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
dax
libnvdimm for 4.18
2018-06-08 17:21:52 -07:00
dca
devfreq
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
dio
dma
fix a series of Documentation/ broken file name references
2018-06-15 18:10:01 -03:00
dma-buf
edac
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
eisa
extcon
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
firewire
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
firmware
Merge branch 'akpm' (patches from Andrew)
2018-06-15 08:51:42 +09:00
fmc
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
fpga
fsi
gpio
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
gpu
Solve a series of broken links for files under Documentation:
2018-06-17 05:25:18 +09:00
hid
docs: fix broken references with multiple hints
2018-06-15 18:10:01 -03:00
hsi
hv
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
hwmon
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
hwspinlock
hwspinlock updates for v4.18
2018-06-11 12:09:19 -07:00
hwtracing
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
i2c
Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2018-06-14 16:21:46 +09:00
ide
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
idle
iio
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
infiniband
treewide: Use array_size() in kvzalloc_node()
2018-06-12 16:19:22 -07:00
input
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
iommu
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
ipack
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
irqchip
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
isdn
treewide: Use array_size() in vmalloc()
2018-06-12 16:19:22 -07:00
leds
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
lightnvm
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
macintosh
powerpc updates for 4.18
2018-06-07 10:23:33 -07:00
mailbox
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
mcb
md
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
media
Solve a series of broken links for files under Documentation:
2018-06-17 05:25:18 +09:00
memory
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
memstick
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
message
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
mfd
Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2018-06-14 16:21:46 +09:00
misc
Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2018-06-14 16:21:46 +09:00
mmc
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
mtd
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
mux
net
Solve a series of broken links for files under Documentation:
2018-06-17 05:25:18 +09:00
nfc
treewide: devm_kmalloc() -> devm_kmalloc_array()
2018-06-12 16:19:22 -07:00
ntb
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
nubus
Char/Misc driver patches for 4.18-rc1
2018-06-05 16:20:22 -07:00
nvdimm
Merge branch 'for-4.18/mcsafe' into libnvdimm-for-next
2018-06-08 15:16:44 -07:00
nvme
Merge branch 'nvme-4.18' of git://git.infradead.org/nvme into for-linus
2018-06-15 08:11:05 -06:00
nvmem
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
of
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
opp
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
oprofile
treewide: Use array_size() in vmalloc()
2018-06-12 16:19:22 -07:00
parisc
parport
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
pci
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
pcmcia
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
perf
phy
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2018-06-06 18:39:49 -07:00
pinctrl
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
platform
fix a series of Documentation/ broken file name references
2018-06-15 18:10:01 -03:00
pnp
media updates for v4.18-rc1
2018-06-07 12:34:37 -07:00
power
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
powercap
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
pps
ps3
ptp
pwm
pwm: Changes for v4.18-rc1
2018-06-14 16:25:43 +09:00
rapidio
treewide: Use array_size() in vmalloc()
2018-06-12 16:19:22 -07:00
ras
regulator
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
remoteproc
treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX
2018-06-15 07:55:25 +09:00
reset
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
rpmsg
rpmsg: smd: do not use mananged resources for endpoints and channels
2018-06-04 12:35:03 -07:00
rtc
- New Device Support
2018-06-11 07:20:17 -07:00
s390
treewide: Use array_size() in vzalloc()
2018-06-12 16:19:22 -07:00
sbus
fix a series of Documentation/ broken file name references
2018-06-15 18:10:01 -03:00
scsi
SCSI fixes on 20180613
2018-06-14 16:35:32 +09:00
sfi
sh
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
siox
slimbus
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
sn
soc
treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX
2018-06-15 07:55:25 +09:00
soundwire
docs: Fix more broken references
2018-06-15 18:11:26 -03:00
spi
treewide: devm_kzalloc() -> devm_kcalloc()
2018-06-12 16:19:22 -07:00
spmi
ssb
staging
media: v4l: fix broken video4linux docs locations
2018-06-15 18:10:01 -03:00
target
treewide: Use array_size() in vzalloc()
2018-06-12 16:19:22 -07:00
tc
tee
thermal
- Error path bug fix for overflow tests (Dan)
2018-06-12 18:28:00 -07:00
thunderbolt
tty
vfs/y2038: inode timestamps conversion to timespec64
2018-06-15 07:31:07 +09:00
uio
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
usb
vfs/y2038: inode timestamps conversion to timespec64
2018-06-15 07:31:07 +09:00
uwb
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
vfio
VFIO updates for v4.18
2018-06-12 13:11:26 -07:00
vhost
virtio, vhost: features, fixes
2018-06-16 06:35:02 +09:00
video
backlight: pwm_bl: Compute brightness of LED linearly to human eye
2018-07-04 10:31:18 +01:00
virt
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
virtio
virtio, vhost: features, fixes
2018-06-16 06:35:02 +09:00
visorbus
vlynq
vme
w1
Char/Misc driver patches for 4.18-rc1
2018-06-05 16:20:22 -07:00
watchdog
MIPS changes for 4.18
2018-06-12 12:56:02 -07:00
xen
treewide: kvmalloc() -> kvmalloc_array()
2018-06-12 16:19:22 -07:00
zorro
- Introduce arithmetic overflow test helper functions (Rasmus)
2018-06-06 17:27:14 -07:00
Kconfig
Makefile