Peter Meerwald 899d90bdf4 iio: Add INT_TIME (integration time) channel info attribute ... Integration time is in seconds; it controls the measurement time and influences the gain of a sensor. There are two typical ways that scaling is implemented in a device: 1) input amplifier, 2) reference to the ADC is changed. These both result in the accuracy of the ADC varying (by applying its sampling over a more relevant range). Integration time is a way of dealing with noise inherent in the analog sensor itself. In the case of a light sensor, a mixture of photon noise and device specific noise. Photon noise is dealt with by either improving the efficiency of the sensor, (more photons actually captured) which is not easily varied dynamically, or by integrating the measurement over a longer time period. Note that this can also be thought of as an averaging of a number of individual samples and is infact sometimes implemented this way. Altering integration time implies that the duration of a measurement changes, a fact the device's user may be interested in. Hence it makes sense to distinguish between integration time and simple scale. In some devices both types of control are present and whilst they will have similar effects on the amplitude of the reading, their effect on the noise of the measurements will differ considerably. Used by adjd_s311, tsl4531, tcs3472 The following drivers have similar controls (and could be adapted): * tsl2563 (integration time is controlled via CALIBSCALE among other things) * tsl2583 (has integration_time device_attr, but driver doesn't use channels yet) * tsl2x7x (has integration_time attr) Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net> Cc: Jon Brenner <jon.brenner@ams.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>		2013-09-14 21:16:44 +01:00
..
ABI	iio: Add INT_TIME (integration time) channel info attribute	2013-09-14 21:16:44 +01:00
accounting	Documentation/accounting/getdelays.c: avoid strncpy in accounting tool	2013-07-03 16:08:06 -07:00
acpi	Power management and ACPI updates for 3.11-rc1	2013-07-03 14:35:40 -07:00
aoe
arm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
arm64	arm64: KVM: document kernel object mappings in HYP	2013-06-12 16:42:20 +01:00
auxdisplay
backlight
blackfin
block	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
blockdev
bus-devices
cdrom
cgroups	Merge branch 'for-3.11/core' of git://git.kernel.dk/linux-block	2013-07-11 13:03:24 -07:00
connector
console	TTY:console: update document console.txt	2013-05-21 10:21:57 -07:00
cpu-freq	cpufreq: rename index as driver_data in cpufreq_frequency_table	2013-06-04 14:25:59 +02:00
cpuidle
cris
crypto	drivers/dma: remove unused support for MEMSET operations	2013-07-03 16:07:42 -07:00
development-process
device-mapper	Add a device-mapper target called dm-switch to provide a multipath	2013-07-11 13:05:40 -07:00
devicetree	iio: at91: introduce the multiple compatible string for different IPs.	2013-08-29 21:45:04 +01:00
DocBook	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2013-08-09 15:04:09 -07:00
driver-model	iio: trigger: implement devm_iio_trigger_alloc/devm_iio_triger_free	2013-08-17 19:34:52 +01:00
dvb
early-userspace	Documentation/early-userspace/README fix a typo	2013-06-05 16:24:58 +02:00
EDID
extcon
fault-injection
fb	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2013-07-09 16:04:31 -07:00
filesystems	xfs: update (#2) for 3.11-rc1	2013-07-13 11:40:24 -07:00
firmware_class
fmc	FMC: add a char-device mezzanine driver	2013-06-18 15:42:15 -07:00
frv
hid
hwmon	New driver to support GMT G762/G763 pwm fan controllers	2013-07-03 19:56:35 -07:00
i2c	Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2013-07-04 14:02:09 -07:00
i2o
ia64
ide
infiniband
input	Input: MT - Specify that ABS_MT_SLOT must have a minimum of 0	2013-06-13 21:32:00 +02:00
ioctl	s390/sclp: Add SCLP character device driver	2013-06-26 21:10:13 +02:00
isdn
ja_JP	HOWTO ja_JP sync	2013-07-24 22:06:34 -07:00
kbuild	Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2013-07-10 16:06:46 -07:00
kdump	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
ko_KR
laptops	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
leds
m68k	block: remove refs to XD disks from documentation	2013-05-17 15:17:12 +02:00
make
memory-devices
metag	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
mips
misc-devices	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
mmc
mn10300
mtd
namespaces
netlabel
networking	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-07-09 18:24:39 -07:00
nfc
parisc	parisc: document the shadow registers	2013-07-09 22:09:19 +02:00
PCI
pcmcia
power	Merge branch 'pm-assorted'	2013-06-28 13:01:40 +02:00
powerpc	powerpc/perf: Core EBB support for 64-bit book3s	2013-07-01 11:50:10 +10:00
pps
prctl
pti
ptp
rapidio	rapidio: documentation update	2013-07-03 16:08:05 -07:00
RCU	Merge branches 'cbnum.2013.06.10a', 'doc.2013.06.10a', 'fixes.2013.06.10a', 'srcu.2013.06.10a' and 'tiny.2013.06.10a' into HEAD	2013-06-10 13:46:44 -07:00
s390
scheduler	sched: Rename sched.c as sched/core.c in comments and Documentation	2013-06-19 12:58:42 +02:00
scsi	[SCSI] megaraid_sas: Changelog and driver version update	2013-06-24 17:52:10 -07:00
security
serial	stallion: final cleanup	2013-06-03 14:31:39 -07:00
sh
sound	ALSA: hda - Update HD-Audio-Models.txt	2013-06-17 11:16:33 +02:00
spi
sysctl	net: rename CONFIG_NET_LL_RX_POLL to CONFIG_NET_RX_BUSY_POLL	2013-08-01 15:11:17 -07:00
target
thermal	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2013-07-11 12:26:08 -07:00
timers	nohz_full: Document additional restrictions	2013-06-10 13:42:38 -07:00
trace	The majority of the changes here are cleanups for the large changes that	2013-07-11 09:02:09 -07:00
usb	Driver core patches for 3.11-rc1	2013-07-02 11:44:19 -07:00
vDSO
video4linux	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2013-07-13 12:09:57 -07:00
virtual	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
vm	zswap: add documentation	2013-07-10 18:11:34 -07:00
w1	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
watchdog	watchdog: delete mpcore_wdt driver	2013-07-11 21:47:58 +02:00
wimax
x86	arm: add support for LZ4-compressed kernel	2013-07-09 10:33:30 -07:00
xtensa
zh_CN	[media] v4l2-framework: replace g_chip_ident by g_std in the examples	2013-06-17 09:18:29 -03:00
.gitignore
00-INDEX	FMC: add documentation for the core	2013-06-18 15:41:03 -07:00
applying-patches.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
bcache.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
Changes
circular-buffers.txt
clk.txt	doc: clk: Fix incorrect wording	2013-06-10 23:54:14 +02:00
coccinelle.txt	Coccinelle: Update information about the minimal version required	2013-07-03 22:58:20 +02:00
CodingStyle	Documentation/CodingStyle: allow multiple return statements per function	2013-07-03 16:08:01 -07:00
cpu-hotplug.txt	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt	/dev/oldmem: Remove the interface	2013-07-03 16:08:03 -07:00
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt
dma-buf-sharing.txt
DMA-ISA-LPC.txt
dmaengine.txt
dmatest.txt	dmatest: do not allow to interrupt ongoing tests	2013-06-08 02:13:44 +05:30
dontdiff
dynamic-debug-howto.txt	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
edac.txt
eisa.txt
email-clients.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gpio.txt
highuid.txt
HOWTO	Documentation: Updated broken link in HOWTO	2013-06-03 14:22:57 -07:00
hw_random.txt
hwspinlock.txt
init.txt
initrd.txt
Intel-IOMMU.txt
intel_txt.txt
io-mapping.txt
io_ordering.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt	kernel-doc: Update references to SGML to refs to XML instead.	2013-05-28 12:02:11 +02:00
kernel-docs.txt
kernel-parameters.txt	The majority of the changes here are cleanups for the large changes that	2013-07-11 09:02:09 -07:00
kernel-per-CPU-kthreads.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
kmemcheck.txt
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
ldm.txt
local_ops.txt
lockdep-design.txt
lockstat.txt
lockup-watchdogs.txt
logo.gif
logo.txt
magic-number.txt
Makefile
ManagementStyle
md.txt	md: remove doubled description for sync_max, merging it within sync_min/sync_max	2013-07-03 09:43:28 +10:00
media-framework.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2013-07-13 12:09:57 -07:00
memory-barriers.txt
memory-hotplug.txt
mono.txt
mutex-design.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
pi-futex.txt
pinctrl.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
pnp.txt
preempt-locking.txt
printk-formats.txt	lib: vsprintf: add IPv4/v6 generic %p[Ii]S[pfs] format specifier	2013-07-01 23:22:13 -07:00
pwm.txt	pwm: Add sysfs interface	2013-06-21 11:32:51 +02:00
ramoops.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rt-mutex-design.txt	sched: Rename sched.c as sched/core.c in comments and Documentation	2013-06-19 12:58:42 +02:00
rt-mutex.txt
rtc.txt	rtc: add ability to push out an existing wakealarm using sysfs	2013-07-03 16:07:54 -07:00
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
smsc_ece1099.txt
sparse.txt
spinlocks.txt	sched: Rename sched.c as sched/core.c in comments and Documentation	2013-06-19 12:58:42 +02:00
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt
SubmitChecklist	Finally eradicate CONFIG_HOTPLUG	2013-06-03 14:20:18 -07:00
SubmittingDrivers
SubmittingPatches
svga.txt
sysfs-rules.txt
sysrq.txt
this_cpu_ops.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt	vfio Updates for v3.11	2013-07-10 14:50:08 -07:00
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt
ww-mutex-design.txt	mutex: Add support for wound/wait style locks	2013-06-26 12:10:56 +02:00
xz.txt
zorro.txt