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4e52889f48
twx-linux/drivers
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Eugen Hristev 4e52889f48 media: atmel: atmel-isc-base: expose white balance as v4l2 controls 
This exposes the white balance configuration of the ISC as v4l2 controls
into userspace.
There are 8 controls available:
4 gain controls, sliders, for each of the BAYER components: R, B, GR, GB.
These gains are multipliers for each component, in format unsigned 0:4:9
with a default value of 512 (1.0 multiplier).
4 offset controls, sliders, for each of the BAYER components: R, B, GR, GB.
These offsets are added/substracted from each component, in format signed
1:12:0 with a default value of 0 (+/- 0)

To expose this to userspace, added 8 custom controls, in an auto cluster.

To summarize the functionality:
The auto cluster switch is the auto white balance control, and it works
like this:
AWB == 1: autowhitebalance is on, the do_white_balance button is inactive,
the gains/offsets are inactive, but volatile and readable.
Thus, the results of the whitebalance algorithm are available to userspace
to read at any time.
AWB == 0: autowhitebalance is off, cluster is in manual mode, user can
configure the gain/offsets directly. More than that, if the
do_white_balance button is pressed, the driver will perform
one-time-adjustment, (preferably with color checker card) and the userspace
can read again the new values.

With this feature, the userspace can save the coefficients and reinstall
them for example after reboot or reprobing the driver.

[hverkuil: fix checkpatch warning]
[hverkuil: minor spacing adjustments in the functionality description]

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2020-02-24 16:12:28 +01:00
..
accessibility
acpi Additional ACPI updates for 5.6-rc1 2020-02-07 12:51:54 -08:00
amba
android for-5.6/io_uring-vfs-2020-01-29 2020-01-29 18:53:37 -08:00
ata libata-5.6-2020-02-05 2020-02-06 06:11:50 +00:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
auxdisplay
base ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
bcma Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
block Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-02-08 13:26:41 -08:00
bluetooth Bluetooth: btrtl: Use kvmalloc for FW allocations 2020-01-24 19:57:53 +01:00
bus ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
cdrom
char treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
clk ARM: SoC: late updates 2020-02-08 14:17:27 -08:00
clocksource ARM: SoC: late updates 2020-02-08 14:17:27 -08:00
connector
counter
cpufreq ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
cpuidle ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
dax
dca
devfreq
dio
dma ARM: Device-tree updates 2020-02-08 13:58:44 -08:00
dma-buf
edac ioremap changes for 5.6 2020-01-27 13:03:00 -08:00
eisa
extcon
firewire
firmware ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
fpga
fsi
gnss
gpio treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
gpu Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
greybus
hid drm pull for 5.6-rc1 2020-01-30 08:04:01 -08:00
hsi
hv - Most of the commits here are work to enable host-initiated hibernation 2020-02-03 14:42:03 +00:00
hwmon ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
hwspinlock hwspinlock: sirf: Use devm_hwspin_lock_register() to register hwlock controller 2020-01-21 16:16:36 -08:00
hwtracing
i2c Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-02-07 12:54:13 -08:00
i3c
ide proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
idle intel_idle: Introduce 'states_off' module parameter 2020-02-03 11:57:18 +01:00
iio chrome platform changes for 5.6 2020-02-04 07:17:41 +00:00
infiniband RDMA subsystem updates for 5.6 2020-01-31 14:40:36 -08:00
input Merge branch 'akpm' (patches from Andrew) 2020-02-04 07:24:48 +00:00
interconnect
iommu IOMMU Updates for Linux v5.6 2020-02-05 17:49:54 +00:00
ipack
irqchip irqchip/gic-v4.1: Avoid 64bit division for the sake of 32bit ARM 2020-02-09 15:47:37 -08:00
isdn proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
leds leds: lm3532: add pointer to documentation and fix typo 2020-01-22 21:08:24 +01:00
lightnvm
macintosh powerpc updates for 5.6 2020-02-04 13:06:46 +00:00
mailbox
mcb
md Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-02-08 13:04:49 -08:00
media media: atmel: atmel-isc-base: expose white balance as v4l2 controls 2020-02-24 16:12:28 +01:00
memory
memstick
message Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net 2020-01-19 22:10:04 +01:00
mfd chrome platform changes for 5.6 2020-02-04 07:17:41 +00:00
misc Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-02-07 12:54:13 -08:00
mmc ioremap changes for 5.6 2020-01-27 13:03:00 -08:00
mtd treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
mux
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-02-08 17:15:08 -08:00
nfc Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net 2020-01-19 22:10:04 +01:00
ntb
nubus
nvdimm mm: Cleanup __put_devmap_managed_page() vs ->page_free() 2020-01-31 10:30:37 -08:00
nvme block-5.6-2020-02-05 2020-02-06 06:15:23 +00:00
nvmem Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-02-07 12:54:13 -08:00
of ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
opp ioremap changes for 5.6 2020-01-27 13:03:00 -08:00
oprofile
parisc proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
parport
pci pci-v5.6-fixes-1 2020-02-06 14:17:38 +00:00
pcmcia
perf
phy treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
pinctrl pinctrl: fix pxa2xx.c build warnings 2020-02-04 03:05:24 +00:00
platform Merge branch 'akpm' (patches from Andrew) 2020-02-04 07:24:48 +00:00
pnp proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
power ARM: SoC platform updates 2020-02-08 13:55:25 -08:00
powercap
pps
ps3
ptp Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net 2020-01-19 22:10:04 +01:00
pwm pwm: Remove set but not set variable 'pwm' 2020-01-20 15:40:49 +01:00
rapidio
ras
regulator - New Drivers 2020-02-03 14:51:57 +00:00
remoteproc remoteproc: qcom: q6v5-mss: Improve readability of reset_assert 2020-01-24 09:34:07 -08:00
reset
rpmsg rpmsg: add rpmsg support for mt8183 SCP. 2020-01-20 10:29:56 -08:00
rtc chrome platform changes for 5.6 2020-02-04 07:17:41 +00:00
s390 s390 updates for the 5.6 merge window #2 2020-02-05 17:33:35 +00:00
sbus
scsi SCSI misc on 20200208 2020-02-08 17:24:41 -08:00
sfi
sh
siox
slimbus
soc ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
soundwire
spi treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
spmi
ssb
staging media: hantro: Support H264 profile control 2020-02-24 16:03:46 +01:00
target SCSI misc on 20200129 2020-01-29 18:16:16 -08:00
tc The main MIPS changes for 5.6: 2020-01-31 11:28:31 -08:00
tee ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
thermal - Fix a SEVERE docs build failure for cpu idle cooling device (Randy Dunlap) 2020-01-31 14:39:21 -08:00
thunderbolt
tty Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
uio
usb Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-02-08 13:26:41 -08:00
vfio VFIO updates for v5.6-rc1 2020-02-03 22:22:05 +00:00
vhost
video Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
virt
virtio virtio_balloon: Fix memory leaks on errors in virtballoon_probe() 2020-02-06 03:40:27 -05:00
visorbus
vlynq
vme Char/Misc driver changes for 5.6-rc1 2020-01-29 10:35:54 -08:00
w1 Char/Misc driver changes for 5.6-rc1 2020-01-29 10:35:54 -08:00
watchdog linux-watchdog 5.6-rc1 tag 2020-02-07 12:30:16 -08:00
xen xen: branch for v5.6-rc1 2020-02-05 17:44:14 +00:00
zorro Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
Kconfig
Makefile