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2008-08-06V4L/DVB (8610): Add suspend/resume capabilities to soc_camera.Robert Jarzmik
Add suspend/resume hooks to call soc operation specific suspend and resume functions. This ensures the camera chip has been previously resumed, as well as the camera bus. These hooks in camera chip drivers should save/restore chip context between suspend and resume time. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-31drivers/media, include/media: delete zero-length filesJeff Garzik
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2008-07-27V4L/DVB (8525): fix a few assorted spelling mistakes.Hans Verkuil
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-27V4L/DVB (8523): v4l2-dev: remove unused type and type2 field from video_deviceHans Verkuil
The type and type2 fields were unused and so could be removed. Instead add a vfl_type field that contains the type of the video device. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-26V4L/DVB (8488): videodev: remove some CONFIG_VIDEO_V4L1_COMPAT code from ↵Hans Verkuil
v4l2-dev.h The video_device_create_file and video_device_remove_file functions can be removed from v4l2-dev.h, removing the dependency on videodev.h in v4l2-dev.h. Also removed a few more videodev.h includes that should have been videodev2.h. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-26V4L/DVB (8483): Remove obsolete owner field from video_device struct.Hans Verkuil
According to an old comment this should have been removed in 2.6.15. Better late than never... Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-26V4L/DVB (8482): videodev: move all ioctl callbacks to a new v4l2_ioctl_ops ↵Hans Verkuil
struct All ioctl callbacks are now stored in a new v4l2_ioctl_ops struct. Drivers fill in a const struct v4l2_ioctl_ops and video_device just contains a const pointer to it. This ensures a clean separation between the const ops struct and the non-const video_device struct. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-26V4L/DVB (8479): tveeprom/ivtv: fix usage of has_ir fieldHans Verkuil
has_ir was set to and compared to -1 in several cases, even though it is an u32. ivtv also contained a FIXME for an old kernel that could be removed. Thanks to Roel Kluin for creating an initial patch for this. Although I chose a different solution here it did help in pointing out the problem. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-26V4L/DVB (8477): v4l: remove obsolete audiochip.hHans Verkuil
Converted the last users of audiochip.h to the v4l2-chip-ident.h header and remove the now unused audiochip.h header. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-23V4L/DVB (8434): Fix x86_64 compilation and move some macros to v4l2-ioctl.hMauro Carvalho Chehab
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-23V4L/DVB (8430): videodev: move some functions from v4l2-dev.h to ↵Hans Verkuil
v4l2-common.h or v4l2-ioctl.h The functions in a header should not belong to another module. The prio functions belong to v4l2-common.c, so move them to v4l2-common.h. The ioctl functions belong to v4l2-ioctl.c, so create a new v4l2-ioctl.h header and move those functions to it. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-23V4L/DVB (8429): videodev: renamed 'class_dev' to 'dev'Hans Verkuil
The class_dev field is a normal device, not a class device. This is very confusing and now that the old 'dev' field has been renamed to 'parent' we can rename 'class_dev' to just 'dev'. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-23V4L/DVB (8428): videodev: rename 'dev' to 'parent'Hans Verkuil
The field 'dev' is not the video device, but the parent of the video device. Rename accordingly. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8395): saa7134: Fix Kbuild dependency of ir-kbd-i2cMauro Carvalho Chehab
Currently, saa7134 is dependent of ir-kbd-i2c, since it uses a symbol that is defined there. However, as this symbol is used only on saa7134, there's no sense on keeping it defined there (or on ir-commons). So, let's move it to saa7134 and remove one symbol for being exported. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8387): Some cosmetic changesHans Verkuil
Those changes, together with some proper patches, will allow out-of-tree compilation for for kernels < 2.6.19 Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8343): soc_camera_platform: Add SoC Camera Platform driverMagnus Damm
This patch adds a simple platform camera device. Useful for testing cameras with SoC camera host drivers. Only one single pixel format and resolution combination is supported. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8342): sh_mobile_ceu_camera: Add SuperH Mobile CEU driver V3Magnus Damm
This is V3 of the SuperH Mobile CEU soc_camera driver. The CEU hardware block is configured in a transparent data fetch mode, frames are captured from the attached camera and written to physically contiguous memory buffers provided by the newly added videobuf-dma-contig queue. Tested on sh7722 and sh7723 processors. Changes since V2: - remove SUPERH Kconfig dependency - move sh_mobile_ceu.h to include/media - add board callback support with enable_camera()/disable_camera() - add support for declare_coherent_memory - rework video memory limit - more verbose error messages Changes since V1: - fixed the CEU driver to work with the newly updated patches Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8341): videobuf: Add physically contiguous queue code V3Magnus Damm
This is V3 of the physically contiguous videobuf queues patch. Useful for hardware such as the SuperH Mobile CEU which doesn't support scatter gatter bus mastering. Since it may be difficult to allocate large chunks of physically contiguous memory after some uptime due to fragmentation, this code allocates memory using dma_alloc_coherent(). Architectures supporting dma_declare_coherent_memory() can easily avoid fragmentation issues by using dma_declare_coherent_memory() to force dma_alloc_coherent() to allocate from a certain pre-allocated memory area. Changes since V2 - use dma_handle for physical address - use "scatter gather" instead of "scatter gatter" Changes since V1: - use dev_err() instead of pr_err() - remember size in struct videobuf_dma_contig_memory - keep struct videobuf_dma_contig_memory in .c file - let videobuf_to_dma_contig() return dma_addr_t - implement __videobuf_sync() - return statements, white space and other minor fixes Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8340): videobuf: Fix gather spellingMagnus Damm
Use "scatter gather" instead of "scatter gatter". Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8339): soc_camera: Add 16-bit bus width supportMagnus Damm
The SuperH Mobile CEU hardware supports 16-bit width bus, so extend the soc_camera code with SOCAM_DATAWIDTH_16. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8338): soc_camera: Move spinlocksMagnus Damm
This patch moves the spinlock handling from soc_camera.c to the actual camera host driver. The spinlock_alloc/free callbacks are replaced with code in init_videobuf(). So far all camera host drivers implement their own spinlock_alloc/free methods anyway, and videobuf_queue_core_init() BUGs on a NULL spinlock argument, so, new camera host drivers will not forget to provide a spinlock when initialising their videobuf queues. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8337): soc_camera: make videobuf independentPaulius Zaleckas
Makes SoC camera videobuf independent. Includes all necessary changes for PXA camera driver (currently the only driver using soc_camera in the mainline). These changes are important for the future soc_camera based drivers. Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20v4l-dvb: remove legacy checks to allow support for kernels < 2.6.10Hans Verkuil
Also remove some blank lines that were used to split compat code at -devel tree. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8128): saa7146: ->cpu_addr and friends are little-endianAl Viro
Annotations + stop saa7146_i2c from playing fast and loose with reuse of ->cpu_addr for host-endian. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8105): cx2341x: add TS capabilityHans Verkuil
The cx18 can support transport streams with newer firmwares. Add a TS capability to the generic cx2341x module. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8103): videodev: fix/improve ioctl debuggingHans Verkuil
Various ioctl debugging fixes and improvements: - use %x rather than %d for control IDs and bitmask fields - make two arrays const - show the whole control array for the ext_ctrl ioctls - print pix_fmt for V4L2_BUF_TYPE_VIDEO_OUTPUT - show full type name rather than an integer - fix CROPCAP debugging - fix G/S_TUNER debugging - show error code in case of an error - other small cleanups Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (8078): Introduce "index" attribute for persistent video4linux ↵brandon@ifup.org
device nodes A number of V4L drivers have a mod param to specify their preferred minors. This is because it is often desirable for applications to have a static /dev name for a particular device. However, using minors has several disadvantages: 1) the requested minor may already be taken 2) using a mod param is driver specific 3) it requires every driver to add a param 4) requires configuration by hand This patch introduces an "index" attribute that when combined with udev rules can create static device paths like this: /dev/v4l/by-path/pci-0000\:00\:1d.2-usb-0\:1\:1.0-video0 /dev/v4l/by-path/pci-0000\:00\:1d.2-usb-0\:1\:1.0-video1 /dev/v4l/by-path/pci-0000\:00\:1d.2-usb-0\:1\:1.0-video2 $ ls -la /dev/v4l/by-path/pci-0000\:00\:1d.2-usb-0\:1\:1.0-video0 lrwxrwxrwx 1 root root 12 2008-04-28 00:02 /dev/v4l/by-path/pci-0000:00:1d.2-usb-0:1:1.0-video0 -> ../../video1 These paths are steady across reboots and should be resistant to rearranging across Kernel versions. video_register_device_index is available to drivers to request a specific index number. Signed-off-by: Brandon Philips <bphilips@suse.de> Signed-off-by: Kees Cook <kees@outflux.net> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (7949): videodev: renamed the vidioc_*_fmt_* callbacksHans Verkuil
The naming for the callbacks that handle the VIDIOC_ENUM_FMT and VIDIOC_S/G/TRY_FMT ioctls was very confusing. Renamed it to match the v4l2_buf_type name. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (7948): videodev: add missing vidioc_try_fmt_sliced_vbi_output and ↵Hans Verkuil
VIDIOC_ENUMOUTPUT handling There was no vidioc_try_fmt_sliced_vbi_output, instead vidioc_try_fmt_vbi_output was reused. The VIDIOC_ENUMOUTPUT handling was missing altogether, even though the callback existed. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (7947): videodev: add vidioc_g_std callback.Hans Verkuil
The default videodev behavior for VIDIOC_G_STD is not correct for all devices. Add a new callback that drivers can use instead. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-07-20V4L/DVB (7942): Hardware frequency seek ioctl interfaceTobias Lorenz
Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-06-26V4L/DVB (8092): videodev: simplify and fix standard enumerationHans Verkuil
VIDIOC_ENUMSTD did not return all the PAL/SECAM/NTSC variants: it just returned one single PAL/SECAM/NTSC standard without separate entries for the trickier standards like NTSC-JP. Changed the code so that it behaves better. Also simplified the if/switch statements into a common standards lookup table. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-06-26V4L/DVB (8048): saa7134: Fix entries for Avermedia A16d and Avermedia E506Tim Farrington
Also, adds IR table for Avermedia A16d Signed-off-by: Tim Farrington <timf@iinet.net.au> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-06-26V4L/DVB (8007): cx18/cx25840: the S-Video LUMA input can use all In1-In8 inputsHans Verkuil
The S-Video LUMA input was restricted to the In1-In4 inputs, but it turns out that it can use the full range of In1-In8. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-06-05V4L/DVB (7911): Remove v4l2_video_std_fps prototype declarationGuennadi Liakhovetski
The v4l2_video_std_fps function has been removed by Adrian Bunk in 2004 but then its prototype re-appeared in include/media/v4l2-dev.h. Remove it. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-05-20Fix a deadlock in the bttv driverArjan van de Ven
vidiocgmbuf() does this: mutex_lock(&fh->cap.vb_lock); retval = videobuf_mmap_setup(&fh->cap, gbuffers, gbufsize, V4L2_MEMORY_MMAP); and videobuf_mmap_setup() then just does mutex_lock(&q->vb_lock); ret = __videobuf_mmap_setup(q, bcount, bsize, memory); mutex_unlock(&q->vb_lock); which is an obvious double-take deadlock. This patch fixes this by having vidiocgmbuf() just call the __videobuf_mmap_setup function instead. Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org> Reported-by: Koos Vriezen <koos.vriezen@gmail.com> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-11i2c: Convert some more new-style drivers to use module aliasingJean Delvare
Update 3 more new-style i2c drivers to use standard module aliasing instead of the old driver_name/type driver matching scheme. These video drivers aren't used yet so converting them is trivial. Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-04-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvbLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb: (28 commits) V4L-DVB(7789a): cx18: fix symbol conflict with ivtv driver V4L/DVB (7789): tuner: remove static dependencies on analog tuner sub-modules V4L/DVB (7785): [2.6 patch] make mt9{m001,v022}_controls[] static V4L/DVB (7786): cx18: new driver for the Conexant CX23418 MPEG encoder chip V4L/DVB (7783): drivers/media/dvb/frontends/s5h1420.c: printk fix V4L/DVB (7782): pvrusb2: Driver is no longer experimental V4L/DVB (7781): pvrusb2-dvb: include dvb support by default and update Kconfig help text V4L/DVB (7780): pvrusb2: always enable support for OnAir Creator / HDTV USB2 V4L/DVB (7779): pvrusb2-dvb: quiet down noise in kernel log for feed debug Rename common tuner Kconfig names to use the same Fix V4L/DVB core help messages V4L/DVB (7769): Move other terrestrial tuners to common/tuners V4L/DVB (7768): reorganize some DVB-S Kconfig items V4L/DVB(7767): Move tuners to common/tuners V4L/DVB (7766): saa7134: add another PCI ID for Beholder M6 V4L/DVB (7765): Add support for Beholder BeholdTV H6 V4L/DVB (7763): ivtv: add tuner support for the AverMedia M116 V4L/DVB (7762): ivtv: fix tuner detection for PAL-N/Nc V4L/DVB (7761): ivtv: increase the DMA timeout from 100 to 300 ms V4L/DVB (7759): ivtv: increase version number to 1.2.1 ...
2008-04-29V4L/DVB (7786): cx18: new driver for the Conexant CX23418 MPEG encoder chipHans Verkuil
Many thanks to Steve Toth from Hauppauge and Nattu Dakshinamurthy from Conexant for their support. I am in particular thankful to Hauppauge since without their help this driver would not exist. It should also be noted that Steve did the work to get the DVB part up and running. Thank you! Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Steven Toth <stoth@hauppauge.com> Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: G. Andrew Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-29i2c: Add support for device alias namesJean Delvare
Based on earlier work by Jon Smirl and Jochen Friedrich. This patch allows new-style i2c chip drivers to have alias names using the official kernel aliasing system and MODULE_DEVICE_TABLE(). At this point, the old i2c driver binding scheme (driver_name/type) is still supported. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Jochen Friedrich <jochen@scram.de> Cc: Jon Smirl <jonsmirl@gmail.com> Cc: Kay Sievers <kay.sievers@vrfy.org>
2008-04-24V4L/DVB (7677): saa7134: Add/fix Beholder entriesDmitry Belimov
Beholder TV/FM tuners: Changes: Add support Beholder Columbus PCMCIA card. Add key map for remote control of Beholder Columbus PCMCIA card. Fix gpiomask for all Beholder tuners. Signed-off-by: Beholder Intl. Ltd. Dmitry Belimov <d.belimov@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7665): videodev: Add default vidioc handlerDouglas Schilling Landgraf
Added default vidioc handler for other private ioctls Signed-off-by: Douglas Schilling Landgraf <dougsland@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7566): videobuf-dvb: allow its usage with videobuf-vmallocMauro Carvalho Chehab
videobuf-dvb were still using a function that were videobuf-dma-sg dependent. This patch creates a generic handler for this function. This way, videobuf-dvb can now work with all videobuf implementations. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7554): videobuf-dma-sg: Remove unused flagMauro Carvalho Chehab
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7538): Adds selectable adapter numbers as per module optionJanne Grunau
The adapter_nr module options can be used to allocate static adapter numbers on a driver level. It avoids problems with changing DVB apapter numbers after warm/cold boot or device unplugging and repluging. Each driver holds DVB_MAX_ADAPTER long array of the preferred order of adapter numbers. options dvb-usb-dib0700 adapter_nr=7,6,5,4,3,2,1,0 would result in a reversed allocation of adapter numbers. With adapter_nr=2,5 it tries first to get adapter number 2 and 5. If both are already in use it will allocate the lowest free adapter number. Signed-off-by: Janne Grunau <janne-dvb@grunau.be> Acked-by: Hermann Pitton <hermann.pitton@arcor.de> Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7506): Powercolor Real Angel 330 (remote control support)Dâniel Fraga
The attached patch adds complete remote control support for Powercolor Real Angel 330. Signed-off-by: Daniel Fraga <fragabr@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7501): soc-camera: use a spinlock for videobuffer queueGuennadi Liakhovetski
All drivers should provide a spinlock to be used in videobuf operations. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Reviewed-by: Brandon Philips <bphilips@suse.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7500): soc-camera: extract function pointers from host object into ↵Guennadi Liakhovetski
operations Function pointers and the driver owner are not expected to change throughout soc-camera host's life. Extract them into an operations struct. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7493): videobuf: Avoid deadlock with QBUF and bring up to spec for ↵Brandon Philips
empty queue Add a waitqueue to wait on when there are no buffers in the buffer queue. DQBUF waits on this queue without holding vb_lock to allow a QBUF to happen. Once a buffer has been queued we recheck that the queue is still streaming and wait on the new buffer's waitqueue while holding the vb_lock. The driver should come along in a timely manner and put the buffer into its next state finishing the DQBUF. By implementing this waitqueue it also brings the videobuf DQBUF up to spec and it now blocks on O_NONBLOCK even when no buffers have been queued via QBUF: "By default VIDIOC_DQBUF blocks when no buffer is in the outgoing queue." - V4L2 spec Signed-off-by: Brandon Philips <bphilips@suse.de> CC: Trent Piepho <xyzzy@speakeasy.org> CC: Carl Karsten <carl@personnelware.com> CC: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24V4L/DVB (7406): soc-camera: improve separation between soc_camera_ops and ↵Guennadi Liakhovetski
soc_camera_device In case of muliple cameras, handled by the same driver, they can support Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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