Daniel Glöckner ff77c352ae gpiolib: allow poll() on value ... Many gpio chips allow to generate interrupts when the value of a pin changes. This patch gives usermode application the opportunity to make use of this feature by calling poll(2) on the /sys/class/gpio/gpioN/value sysfs file. The edge to trigger can be set in the edge file in the same directory. Possible values are "none", "rising", "falling", and "both". Using level triggers is not possible with current sysfs since nothing changes the GPIO value (and the IRQ keeps triggering). Edge triggering will "just work". Note that if there was an event between read() and poll(), the poll() returns immediately. Also note that this version only supports true GPIO interrupts. Some later patch might be able to synthesize this behavior by timer-driven polling; some systems seem to need that. [dbrownell@users.sourceforge.net: align ids to 16 bit ids; whitespace] Signed-off-by: Daniel Glöckner <dg@emlix.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-09-23 07:39:48 -07:00
..
ABI	gpiolib: allow poll() on value	2009-09-23 07:39:48 -07:00
DocBook	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-09-22 07:51:45 -07:00
PCI	PCI: document PCIe fundamental reset interfaces	2009-09-09 13:29:38 -07:00
RCU	rcu: Remove CONFIG_PREEMPT_RCU	2009-08-23 10:32:40 +02:00
accounting	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
acpi	ACPI: update debug parameter documentation	2008-11-07 21:45:29 -05:00
aoe	aoe: user can ask driver to forget previously detected devices	2008-02-08 09:22:31 -08:00
arm	Merge branch 'omap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6	2009-09-18 09:19:26 -07:00
auxdisplay	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
blackfin	Blackfin arch: Add document about bfin-gpio	2009-01-07 23:14:38 +08:00
block	Trivial typo fixes in Documentation/block/data-integrity.txt.	2009-07-01 10:56:25 +02:00
blockdev	mflash: initial support	2009-04-07 08:12:38 +02:00
cdrom	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
cgroups	cpusets: document adding/removing cpus to cpuset elaborately	2009-06-30 18:56:01 -07:00
connector	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2009-07-23 19:03:51 -07:00
console	Typo: fro -> from	2007-07-19 10:04:47 -07:00
cpu-freq	[CPUFREQ] update Doc for cpuinfo_cur_freq and scaling_cur_freq	2009-09-01 12:45:09 -04:00
cpuidle	cpuidle: Add Documentation	2008-02-14 00:16:13 -05:00
cris	fix random typos	2008-10-16 11:21:30 -07:00
crypto	async_tx, dmaengine: document channel allocation and api rework	2009-01-05 18:10:19 -07:00
development-process	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper	dm raid1: add userspace log	2009-06-22 10:12:35 +01:00
driver-model	driver model: fix show/store prototypes in doc.	2009-07-12 13:02:10 -07:00
dvb	V4L/DVB (12902): Documentation: synchronize documentation for Technisat cards	2009-09-19 00:14:32 -03:00
early-userspace	Documentation: Remove last references to BitKeeper.	2008-04-21 22:19:05 +00:00
fault-injection	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
fb	Documentation/fb/vesafb.txt: fix typo	2009-06-16 19:47:58 -07:00
filesystems	ncpfs: remove dead URL from documentation	2009-09-23 07:39:42 -07:00
firmware_class	driver core: fix documentation of request_firmware_nowait	2009-06-15 21:30:24 -07:00
frv	move frv docs one level up	2008-02-03 15:54:28 +02:00
hwmon	trivial: doc: hpfall: accept disk device to unload as argument	2009-09-21 15:14:57 +02:00
i2c	i2c: Add a sysfs interface to instantiate devices	2009-06-19 16:58:20 +02:00
i2o	documentation: convert the Documentation directory to UTF-8	2007-05-09 08:58:19 +02:00
ia64	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
ide	ide: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband	IPoIB: Document newish features	2009-04-08 13:52:01 -07:00
input	Input: add new driver for Sentelic Finger Sensing Pad	2009-08-19 21:46:09 -07:00
ioctl	Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2009-09-14 17:43:43 -07:00
isdn	isdn: clean up documentation index	2009-06-20 01:10:38 -07:00
ja_JP	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
kbuild	kconfig: resort the documentation of the environment variables	2009-06-09 22:37:47 +02:00
kdump	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
ko_KR	HOWTO: update misspelling and word incorrected	2007-12-17 10:33:19 -08:00
kvm	KVM: Document KVM_CAP_IRQCHIP	2009-09-10 10:46:55 +03:00
laptops	thinkpad-acpi: remove dock and bay subdrivers	2009-08-01 23:46:58 -04:00
lguest	lguest and virtio: cleanup struct definitions to Linux style.	2009-07-30 16:03:46 +09:30
m68k	[SCSI] 53c7xx: fix removal fallout	2008-01-11 18:22:30 -06:00
make	Documentation/make/headers_install.txt	2007-10-17 08:43:05 -07:00
mips	ide: remove unused CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ	2009-01-14 19:19:03 +01:00
misc-devices	drivers/misc/isl29003.c: driver for the ISL29003 ambient light sensor	2009-04-01 08:59:18 -07:00
mn10300	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
mtd	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
namespaces	The namespaces compatibility list doc	2007-11-29 09:24:53 -08:00
netlabel	Fix occurrences of "the the "	2007-05-09 08:57:56 +02:00
networking	trivial: fix typo "to to" in multiple files	2009-09-21 15:14:55 +02:00
parisc	…
pcmcia	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
power	PM: Introduce core framework for run-time PM of I/O devices (rev. 17)	2009-08-23 00:04:44 +02:00
powerpc	powerpc: introduce and document sdhci,wp-inverted property for eSDHC	2009-09-23 07:39:37 -07:00
pps	LinuxPPS: core support	2009-06-18 13:04:04 -07:00
prctl	generic, x86: add tests for prctl PR_GET_TSC and PR_SET_TSC	2008-04-19 19:19:55 +02:00
s390	[S390] s390dbf: Add description for usage of "%s" in sprintf events	2009-09-11 10:29:53 +02:00
scheduler	sched: Documentation/sched-rt-group: Fix style issues & bump version	2009-06-21 13:12:46 +02:00
scsi	trivial: fix typos "man[ae]g?ment" -> "management"	2009-09-21 15:14:56 +02:00
serial	Create/use more directory structure in the Documentation/ tree.	2008-11-14 17:28:53 +00:00
sh	sh: Kill off remaining CONFIG_SH_KGDB bits.	2008-12-22 18:44:05 +09:00
sound	trivial: fix typos "man[ae]g?ment" -> "management"	2009-09-21 15:14:56 +02:00
sparc	sparc: Remove Documentation/sparc/sbus_drivers.txt	2008-08-29 02:15:25 -07:00
spi	spi: fix spelling of `automatically' in documentation	2009-09-23 07:39:44 -07:00
sysctl	printk: add printk_delay to make messages readable for some scenarios	2009-09-23 07:39:28 -07:00
telephony	remove mention of CONFIG_KMOD from documentation	2008-07-22 19:24:29 +10:00
thermal	thermal: update the documentation	2008-04-29 02:49:47 -04:00
timers	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-09-22 07:51:45 -07:00
uml	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
usb	trivial: usb: fix missing space typo in doc	2009-06-12 18:01:51 +02:00
video4linux	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
vm	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
w1	w1: send status messages after command processing	2009-01-08 08:31:14 -08:00
watchdog	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
wimax	i2400m: documentation and instructions for usage	2009-01-07 10:00:18 -08:00
x86	Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-18 14:05:47 -07:00
zh_CN	Chinese: add translation of Codingstyle	2008-01-24 20:40:04 -08:00
00-INDEX	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
BUG-HUNTING	Documentation: add hint about call traces & module symbols to BUG-HUNTING	2008-02-06 10:41:09 -08:00
Changes	Documentation/Changes: perl is needed to build the kernel	2009-06-18 13:03:46 -07:00
CodingStyle	trivial: fix typo milisecond/millisecond for documentation and source comments.	2009-06-12 18:01:46 +02:00
DMA-API.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
DMA-ISA-LPC.txt	Fix typos in /Documentation : 'T''	2006-11-30 04:55:36 +01:00
DMA-attributes.txt	powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code	2008-07-22 10:39:36 +10:00
DMA-mapping.txt	dma-mapping: update the old macro DMA_nBIT_MASK related documentations	2009-04-07 08:31:12 -07:00
HOWTO	Remove Andrew Morton's http://www.zip.com.au/~akpm/	2008-10-16 11:21:32 -07:00
IO-mapping.txt	Documentation: move DMA-mapping.txt to Doc/PCI/	2009-01-29 18:19:29 -08:00
IPMI.txt	IPMI: new NMI handling	2007-10-18 14:37:32 -07:00
IRQ-affinity.txt	genirq: Expose default irq affinity mask (take 3)	2008-06-05 15:18:30 +02:00
IRQ.txt	…
Intel-IOMMU.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
Makefile	docsrc: build Documentation/ sources	2008-08-12 16:07:30 -07:00
ManagementStyle	docs: fix ManagementStyle book name	2008-10-30 11:38:46 -07:00
SAK.txt	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SELinux.txt	selinux: add support for installing a dummy policy (v2)	2008-08-27 08:54:08 +10:00
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
SecurityBugs	…
Smack.txt	smack: implement logging V3	2009-04-14 09:00:23 +10:00
SubmitChecklist	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
SubmittingDrivers	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SubmittingPatches	trivial: SubmittingPatches: Fix reference to renumbered step	2009-09-21 15:14:57 +02:00
VGA-softcursor.txt	…
applying-patches.txt	…
atomic_ops.txt	Documentation/atomic_ops.txt: fix sample code	2009-06-16 19:47:52 -07:00
bad_memory.txt	Document handling of bad memory	2008-12-03 16:09:53 -07:00
basic_profiling.txt	…
binfmt_misc.txt	documentation: convert the Documentation directory to UTF-8	2007-05-09 08:58:19 +02:00
braille-console.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt	gpio: add bt8xxgpio driver	2008-07-25 10:53:30 -07:00
btmrvl.txt	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
c2port.txt	Add c2 port support	2008-11-12 17:17:18 -08:00
cachetlb.txt	remove unused flush_tlb_pgtables	2007-10-19 11:53:34 -07:00
cpu-hotplug.txt	x86: use possible_cpus=NUM to extend the possible cpus allowed	2008-12-18 12:08:05 +01:00
cpu-load.txt	[PATCH] Documentation: CPU load calculation description	2007-03-01 14:53:39 -08:00
cputopology.txt	cpumask: Use topology_core_cpumask()/topology_thread_cpumask()	2009-01-11 19:12:49 +01:00
credentials.txt	CRED: Documentation	2008-11-14 10:39:26 +11:00
dcdbas.txt	…
debugging-modules.txt	Documentation: Clarify when module debugging actually works.	2008-02-03 15:27:38 +02:00
debugging-via-ohci1394.txt	firewire: fw-ohci: add option for remote debugging	2008-04-18 17:55:33 +02:00
dell_rbu.txt	trivial: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt	lanana: assign a device name and numbering for MAX3100	2009-04-07 08:44:05 -07:00
dmaengine.txt	async_tx, dmaengine: document channel allocation and api rework	2009-01-05 18:10:19 -07:00
dontdiff	sparc: Kill PROM console driver.	2009-09-15 17:04:38 -07:00
dynamic-debug-howto.txt	Dynamic debug: allow simple quoting of words	2009-03-24 16:38:27 -07:00
edac.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
eisa.txt	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
email-clients.txt	Documentation/email-clients.txt: add some info about gmail	2008-11-06 15:41:19 -08:00
feature-removal-schedule.txt	Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-17 21:07:08 -07:00
flexible-arrays.txt	Document the flex_array library.	2009-09-10 14:33:36 -06:00
futex-requeue-pi.txt	futex: add requeue-pi documentation	2009-05-09 07:12:50 +02:00
gcov.txt	trivial: fix typo in CONFIG_DEBUG_FS in gcov doc	2009-09-21 15:14:56 +02:00
gpio.txt	gpiolib: allow poll() on value	2009-09-23 07:39:48 -07:00
highuid.txt	[SPARC]: Remove SunOS and Solaris binary support.	2008-04-21 15:10:15 -07:00
hw_random.txt	hw_random doc updates	2008-03-24 19:22:19 -07:00
ics932s401	ics932s401: new clock generator chip driver	2008-11-12 17:17:18 -08:00
initrd.txt	use the newc archive format as requested by initramfs	2008-02-03 14:54:41 +02:00
intel_txt.txt	x86, intel_txt: Intel TXT boot support	2009-07-21 11:49:06 -07:00
io-mapping.txt	io mapping: improve documentation	2008-11-03 18:21:44 +01:00
io_ordering.txt	…
iostats.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
irqflags-tracing.txt	…
isapnp.txt	…
java.txt	Documentation/java.txt: typo and grammar fixes	2007-10-20 02:37:21 +02:00
kernel-doc-nano-HOWTO.txt	kernel-doc: allow multi-line declaration purpose descriptions	2009-09-18 09:48:52 -07:00
kernel-docs.txt	doc: update to URL and status of kernel-docs.txt entry	2008-06-06 11:29:10 -07:00
kernel-parameters.txt	trivial: typo in kernel-parameters.txt	2009-09-21 15:15:52 +02:00
keys-request-key.txt	keys: allow the callout data to be passed as a blob rather than a string	2008-04-29 08:06:16 -07:00
keys.txt	KEYS: Add a keyctl to install a process's session keyring on its parent [try #6]	2009-09-02 21:29:22 +10:00
kmemcheck.txt	kmemcheck: update documentation	2009-07-01 22:36:22 +02:00
kmemleak.txt	kmemleak: add clear command support	2009-09-08 16:36:08 +01:00
kobject.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
kprobes.txt	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
kref.txt	kref: double kref_put() in my_data_handler()	2009-09-18 09:48:52 -07:00
ldm.txt	LDM: Fix for Windows Vista dynamic disks	2007-05-21 09:58:40 -07:00
leds-class.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
leds-lp3944.txt	leds: LED driver for National Semiconductor LP3944 Funlight Chip	2009-06-23 20:21:38 +01:00
local_ops.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lockdep-design.txt	lockdep: Fix typos in documentation	2009-08-07 12:03:46 +02:00
lockstat.txt	lockstat: contend with points	2008-10-20 15:43:10 +02:00
logo.gif	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
logo.txt	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
magic-number.txt	documentation: update header file paths	2009-01-06 15:59:28 -08:00
mca.txt	The ps2esdi driver was marked as BROKEN more than two years ago due to being	2008-03-17 09:03:05 +01:00
md.txt	Documentation/md.txt update	2009-03-31 15:18:37 +11:00
memory-barriers.txt	sched: Document memory barriers implied by sleep/wake-up primitives	2009-04-29 14:15:55 +02:00
memory-hotplug.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
memory.txt	Documentation/memory.txt: remove some very outdated recommendations	2009-09-22 07:17:26 -07:00
mono.txt	Fix "can not" in Documentation and Kconfig	2006-10-03 22:53:09 +02:00
mutex-design.txt	Documentation: Add nested versions of mutex locks to docs	2007-10-20 00:15:26 +02:00
nmi_watchdog.txt	x86, nmi-watchdog: update procfs nmi_watchdog file documentation v2	2008-10-30 19:07:04 +01:00
nommu-mmap.txt	NOMMU: Make mmap allocation page trimming behaviour configurable.	2009-01-08 12:04:47 +00:00
numastat.txt	mm: fix NUMA accounting in numastat.txt	2009-09-22 07:17:39 -07:00
oops-tracing.txt	Taint kernel after WARN_ON(condition)	2008-04-29 08:05:59 -07:00
parport-lowlevel.txt	plip: fix parport_register_device name parameter	2007-11-26 19:39:01 -08:00
parport.txt	…
pi-futex.txt	fix a typo in Documentation/pi-futex.txt	2006-10-03 23:39:02 +02:00
pnp.txt	Documentation: Replace obsolete "driverfs" with "sysfs".	2008-01-24 20:40:04 -08:00
preempt-locking.txt	…
printk-formats.txt	DOC: add printk-formats.txt	2008-11-12 17:17:17 -08:00
prio_tree.txt	Documentation: remove duplicated words	2006-10-03 22:57:56 +02:00
rbtree.txt	trivial: rbtree.txt: fix rb_entry() parameters in sample code	2009-06-12 18:01:47 +02:00
rfkill.txt	rfkill: export persistent attribute in sysfs	2009-06-19 11:50:18 -04:00
robust-futex-ABI.txt	futex: documentation: fix inconsistent description of futex list_op_pending	2009-06-18 13:03:56 -07:00
robust-futexes.txt	Fix typos in /Documentation : Misc	2006-11-30 05:21:10 +01:00
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	rtc: add boot_timesource sysfs attribute	2009-09-23 07:39:46 -07:00
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
slow-work.txt	Document the slow work thread pool	2009-04-03 16:42:35 +01:00
sparse.txt	Documentation: explain the difference between __bitwise and __bitwise__	2009-04-11 08:18:11 +02:00
spinlocks.txt	Add additional examples in Documentation/spinlocks.txt	2008-04-11 13:21:14 -06:00
stable_api_nonsense.txt	stable_api_nonsense.txt: Disambiguate the use of "this" by using "that" to refer to the syscall interface	2007-07-30 14:25:12 -07:00
stable_kernel_rules.txt	Update stable tree documentation	2008-10-29 15:03:49 -07:00
svga.txt	…
sysfs-rules.txt	Doc/sysfs-rules: Swap the order of the words so the sentence makes more sense	2009-05-08 19:22:20 -07:00
sysrq.txt	sysrq, kdump: make sysrq-c consistent	2009-07-29 19:10:36 -07:00
tomoyo.txt	tomoyo: add Documentation/tomoyo.txt	2009-04-14 09:14:58 +10:00
unaligned-memory-access.txt	introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol	2008-07-25 10:53:27 -07:00
unicode.txt	…
unshare.txt	Documentation: remove duplicated words	2006-10-03 22:57:56 +02:00
vgaarbiter.txt	PCI/VGA: add VGA arbitration documentation	2009-09-09 13:29:42 -07:00
video-output.txt	output: Add output class document	2006-12-20 01:46:58 -05:00
volatile-considered-harmful.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
voyager.txt	…
zorro.txt	…