Laurent Pinchart 53e269c102 [media] media: Entities, pads and links ... As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>		2011-03-22 04:53:10 -03:00
..
ABI	[media] media: Media device	2011-03-22 04:53:09 -03:00
accounting	taskstats: pad taskstats netlink response for aligment issues on ia64	2010-12-22 19:43:34 -08:00
acpi	ACPI, APEI, Add APEI generic error status printing support	2010-12-13 23:42:12 -05:00
aoe	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
arm	Revert "dt: add documentation of ARM dt boot interface"	2011-02-14 08:13:20 -07:00
auxdisplay	includecheck fix: Documentation, cfag12864b-example.c	2009-09-24 07:20:57 -07:00
blackfin	Blackfin: document SPI CS limitations with CPHA=0	2010-08-06 12:55:52 -04:00
block	Documentation: remove anticipatory scheduler info	2010-11-11 12:09:59 +01:00
blockdev	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
cdrom	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
cgroups	revert documentaion update for memcg's dirty ratio.	2011-01-14 07:52:02 -08:00
connector	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
console	doc: fix console doc typo	2010-02-24 13:51:32 +01:00
cpu-freq	[CPUFREQ] Processor Clocking Control interface driver	2010-01-13 10:55:16 -05:00
cpuidle
cris
crypto	async_tx: add support for asynchronous RAID6 recovery operations	2009-08-29 19:09:27 -07:00
development-process	Documentation/development-process: more staging info	2010-11-18 15:00:47 -08:00
device-mapper	dm: raid456 basic support	2011-01-13 20:00:02 +00:00
devicetree	Revert "dt: add documentation of ARM dt boot interface"	2011-02-14 08:13:20 -07:00
DocBook	[media] media: Entities, pads and links	2011-03-22 04:53:10 -03:00
driver-model	driver core: prune docs about device_interface	2010-11-10 16:57:11 -08:00
dvb	[media] get_dvb_firmware: ngene_18.fw added	2011-03-21 20:31:45 -03:00
early-userspace
fault-injection	lkdtm: add debugfs access and loosen KPROBE ties	2010-03-06 11:26:32 -08:00
fb	Merge branch 'fbdev/udlfb'	2011-01-06 18:10:09 +09:00
filesystems	NTFS: Fix invalid pointer dereference in ntfs_mft_record_alloc().	2011-01-31 12:58:11 +10:00
firmware_class	firmware: Update hotplug script	2010-08-05 13:53:34 -07:00
frv
hwmon	hwmon: (k10temp) add support for AMD Family 12h/14h CPUs	2011-02-18 06:14:24 -08:00
i2c	i2c: Add generic I2C multiplexer using GPIO API	2011-01-10 22:11:23 +01:00
i2o
ia64	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
ide
infiniband	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
input	Input: fix force feedback capability query example	2011-01-11 01:07:55 -08:00
ioctl	pps: add kernel consumer support	2011-01-13 08:03:21 -08:00
isdn	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-08-04 15:31:02 -07:00
ja_JP	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
kbuild	Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6	2011-01-10 08:57:03 -08:00
kdump	kdump: update kexec-tools URL and Vivek's email	2010-11-25 14:36:38 +01:00
ko_KR	Docs/Kconfig: Update: osdl.org -> linuxfoundation.org	2010-11-15 23:50:13 +01:00
kvm	Merge branch 'kvm-updates/2.6.38' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2011-01-13 10:14:24 -08:00
laptops	thinkpad-acpi: untangle ACPI/vendor backlight selection	2010-08-16 11:54:50 -04:00
leds	Documentation: led drivers lp5521 and lp5523	2010-11-12 07:55:32 -08:00
lguest	lguest: document --rng in example Launcher	2011-01-20 21:37:29 +10:30
m68k
make	kbuild: introduce HDR_ARCH_LIST for headers_install_all	2010-12-14 22:16:19 +01:00
mips
misc-devices	Documentation: short descriptions for bh1770glc and apds990x drivers	2010-10-26 16:52:14 -07:00
mmc	mmc: add erase, secure erase, trim and secure trim operations	2010-08-12 08:43:30 -07:00
mn10300
mtd	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
namespaces
netlabel	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
networking	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6	2011-03-03 15:48:01 -08:00
nfc	NFC: Driver for NXP Semiconductors PN544 NFC chip.	2011-01-13 08:03:19 -08:00
parisc
PCI	Documentation: pci.txt: fix typo	2010-07-11 22:17:45 +02:00
pcmcia	pcmcia: use autoconfiguration feature for ioports and iomem	2010-09-29 17:20:24 +02:00
power	PM: Fix references to basic-pm-debugging.txt in drivers-testing.txt	2010-12-24 15:02:41 +01:00
powerpc	dt: Move device tree documentation out of powerpc directory	2011-01-31 00:09:01 -07:00
pps	pps: add parallel port PPS signal generator	2011-01-13 08:03:21 -08:00
prctl
RCU	rcu: update documentation/comments for Lai's adoption patch	2010-11-29 22:01:59 -08:00
s390	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
scheduler	sched, docs: Update schedstats documentation to version 15	2011-02-01 09:07:13 +01:00
scsi	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-01-13 10:05:56 -08:00
serial	pps: timestamp is always passed to dcd_change()	2011-01-13 08:03:20 -08:00
sh	sh: clkfwk: Kill off unused clk_set_rate_ex().	2010-11-15 18:25:12 +09:00
sound	ALSA: HDA: Add a new model "asus" for Conexant 5066/205xx	2011-01-22 17:29:22 +01:00
sparc
spi	arm/pxa2xx: reorgazine SSP and SPI header files	2010-12-01 12:18:33 +01:00
sysctl	sysctl: remove obsolete comments	2011-01-13 08:03:18 -08:00
target	[SCSI] target: Add LIO target core v4.0.0-rc6	2011-01-14 10:12:29 -06:00
telephony	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
thermal	thermal: Add event notification to thermal framework	2011-01-12 00:08:35 -05:00
timers	tree-wide: fix comment/printk typos	2010-11-01 15:38:34 -04:00
trace	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-01-13 10:05:56 -08:00
uml	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
usb	USB: use the runtime-PM autosuspend implementation	2010-11-16 14:03:41 -08:00
video4linux	[media] v4l: subdev: Events support	2011-03-21 20:32:42 -03:00
vm	thp: transparent hugepage support documentation	2011-01-13 17:32:38 -08:00
w1	w1: DS2423 counter driver and documentation	2011-01-13 08:03:22 -08:00
watchdog	watchdog: docs: add an entry for imx2_wdt	2010-07-01 16:02:55 +00:00
wimax
x86	x86: support XZ-compressed kernel	2011-01-13 08:03:25 -08:00
zh_CN	Docs/Kconfig: Update: osdl.org -> linuxfoundation.org	2010-11-15 23:50:13 +01:00
.gitignore	add random binaries to .gitignore	2010-04-08 11:34:34 +02:00
00-INDEX	mmc: add erase, secure erase, trim and secure trim operations	2010-08-12 08:43:30 -07:00
apparmor.txt	AppArmor: update Maintainer and Documentation	2010-08-02 15:35:15 +10:00
applying-patches.txt
atomic_ops.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
braille-console.txt
bt8xxgpio.txt
btmrvl.txt	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
BUG-HUNTING
bus-virt-phys-mapping.txt	documentation: fix almost duplicate filenames (IO/io-mapping.txt)	2010-07-20 17:49:30 +00:00
cachetlb.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
Changes	Documentation update broken web addresses	2010-07-11 21:55:42 +02:00
circular-buffers.txt	Document Linux's circular buffering capabilities	2010-03-24 16:31:22 -07:00
coccinelle.txt	scripts/coccinelle: update for compatability with Coccinelle 0.2.4	2010-12-03 12:27:01 +01:00
CodingStyle
cpu-hotplug.txt	documentation: fix erroneous email address.	2010-08-11 23:04:10 +09:30
cpu-load.txt
cputopology.txt	topology/sysfs: Provide book id and siblings attributes	2010-09-09 20:41:25 +02:00
credentials.txt	CRED: Fix __task_cred()'s lockdep check and banner comment	2010-07-29 15:16:18 -07:00
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt	ieee1394: update URLs in debugging-via-ohci1394.txt	2009-10-03 09:28:11 +02:00
dell_rbu.txt
devices.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2010-10-28 09:35:11 -07:00
DMA-API-HOWTO.txt	Documentation: DMA-API-HOWTO.txt: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN	2010-08-14 11:56:46 -07:00
DMA-API.txt	dma-mapping: remove dma_is_consistent API	2010-08-11 08:59:21 -07:00
DMA-attributes.txt
DMA-ISA-LPC.txt
dmaengine.txt
dontdiff	Documentation/dontdiff: add further autogenerated files to ignore list	2011-01-06 09:59:37 -08:00
dynamic-debug-howto.txt	Dynamic Debug: Introduce ddebug_query= boot parameter	2010-10-22 10:16:42 -07:00
edac.txt	EDAC: Fix typos in Documentation/edac.txt	2010-11-25 17:32:47 +01:00
eisa.txt	doc: fix Defaultd -> Defaults typo in EISA doc	2010-02-05 12:22:39 +01:00
email-clients.txt	Documentation/email-clients.txt: update Thunderbird docs with wordwrap plugin	2011-01-13 08:03:15 -08:00
feature-removal-schedule.txt	[media] v4l: removal of old, obsolete ioctls	2011-03-21 20:32:12 -03:00
flexible-arrays.txt	Update flex_arrays.txt	2009-10-15 07:25:20 -06:00
futex-requeue-pi.txt
gcov.txt	trivial: fix typo in CONFIG_DEBUG_FS in gcov doc	2009-09-21 15:14:56 +02:00
gpio.txt	Revert "gpiolib: annotate gpio-intialization with __must_check"	2011-01-13 17:26:46 -08:00
highuid.txt
HOWTO	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
hw_random.txt
init.txt	init/main.c: improve usability in case of init binary failure	2010-03-06 11:26:29 -08:00
initrd.txt
intel_txt.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
Intel-IOMMU.txt	intel-iommu: Kill DMAR_BROKEN_GFX_WA option.	2009-09-19 09:37:23 -07:00
io_ordering.txt
io-mapping.txt
iostats.txt	remove extraneous 'is' from Documentation/iostats.txt	2011-01-03 14:00:28 +01:00
IPMI.txt	IPMI: Add the document description of ipmi_get_smi_info	2010-12-14 00:22:00 -05:00
IRQ-affinity.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt	docbook: warn on unused doc entries	2010-09-11 16:49:21 -07:00
kernel-docs.txt	Documentation: update kernel-docs.txt	2011-01-06 09:59:38 -08:00
kernel-parameters.txt	Documentation: log_buf_len uses [KMG] suffix	2011-02-21 15:07:04 -08:00
keys-request-key.txt
keys-trusted-encrypted.txt	keys: add new trusted key-type	2010-11-29 08:55:25 +11:00
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	kobject: documentation: Update to refer to kset-example.c.	2010-03-19 07:12:20 -07:00
kprobes.txt	tree-wide: fix comment/printk typos	2010-11-01 15:38:34 -04:00
kref.txt	kref: double kref_put() in my_data_handler()	2009-09-18 09:48:52 -07:00
ldm.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
leds-class.txt	led-class: always implement blinking	2010-11-12 07:55:32 -08:00
leds-lp3944.txt	leds: LED driver for National Semiconductor LP3944 Funlight Chip	2009-06-23 20:21:38 +01:00
local_ops.txt
lockdep-design.txt	lockdep: Fix typos in documentation	2009-08-07 12:03:46 +02:00
lockstat.txt	lockstat: Add usage info to Documentation/lockstat.txt	2009-12-06 13:20:02 +01:00
logo.gif
logo.txt
magic-number.txt	take coda-private headers out of include/linux	2011-01-12 20:02:48 -05:00
Makefile	[media] Remove the old V4L1 v4lgrab.c file	2010-12-29 08:17:12 -02:00
ManagementStyle
mca.txt
md.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
media-framework.txt	[media] media: Entities, pads and links	2011-03-22 04:53:10 -03:00
memory-barriers.txt	Document Linux's circular buffering capabilities	2010-03-24 16:31:22 -07:00
memory-hotplug.txt	mm: add numa node symlink for memory section in sysfs	2009-12-15 08:53:17 -08:00
memory.txt	Documentation/memory.txt: remove some very outdated recommendations	2009-09-22 07:17:26 -07:00
mono.txt
mutex-design.txt	mutex: Fix annotations to include it in kernel-locking docbook	2010-09-03 08:19:51 +02:00
nmi_watchdog.txt
nommu-mmap.txt	nommu: fix malloc performance by adding uninitialized flag	2009-12-15 08:53:24 -08:00
numastat.txt	mm: fix NUMA accounting in numastat.txt	2009-09-22 07:17:39 -07:00
oops-tracing.txt	panic: Add taint flag TAINT_FIRMWARE_WORKAROUND ('I')	2010-05-19 08:37:43 +01:00
padata.txt	Documentation/padata.txt: fix typos etc.	2010-08-11 08:59:18 -07:00
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt	doc: capitalization and other minor fixes in pnp doc	2010-02-05 12:22:44 +01:00
preempt-locking.txt
printk-formats.txt
prio_tree.txt
rbtree.txt	Documentation: remove anticipatory scheduler info	2010-11-11 12:09:59 +01:00
rfkill.txt	Document the rfkill sysfs ABI	2010-03-10 17:09:33 -05:00
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
rt-mutex-design.txt	variable name fix to Documentation/rt-mutex-design.txt	2010-06-05 17:39:09 +02:00
rt-mutex.txt
rtc.txt	rtc: add boot_timesource sysfs attribute	2009-09-23 07:39:46 -07:00
SAK.txt
SecurityBugs
SELinux.txt
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
Smack.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
sparse.txt	update email address	2010-07-19 10:56:54 +02:00
spinlocks.txt	Documentation: rw_lock lessons learned	2009-12-14 09:46:56 -08:00
stable_api_nonsense.txt
stable_kernel_rules.txt	Documentation: -stable rules: upstream commit ID requirement reworded	2010-04-22 15:24:56 -07:00
SubmitChecklist	Documentation: update SubmitChecklist for O=objdir and kconfig testing	2010-05-24 07:31:20 -07:00
SubmittingDrivers	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
SubmittingPatches	SubmittingPatches: add more about patch descriptions	2010-08-09 20:45:05 -07:00
svga.txt
sysfs-rules.txt	Fix typos in comments	2010-03-16 11:47:56 +01:00
sysrq.txt	documentation: update sysrq.txt magic sysrq keys	2010-10-26 17:32:41 -07:00
tomoyo.txt	TOMOYO: Update version to 2.3.0	2010-08-02 15:35:10 +10:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
vgaarbiter.txt	vgaarbiter: fix a typo in the vgaarbiter Documentation	2009-12-16 11:28:58 -08:00
video-output.txt
volatile-considered-harmful.txt	Documentation/volatile-considered-harmful.txt: correct cpu_relax() documentation	2010-03-24 16:31:20 -07:00
workqueue.txt	workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'	2011-02-16 17:48:59 +01:00
xz.txt	decompressors: add XZ decompressor module	2011-01-13 08:03:24 -08:00
zorro.txt