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linux/drivers/usb/gadget
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Bhupesh Sharma d692522577 usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework 
This patch reworks the videobuffer management logic present in the UVC
webcam gadget and ports it to use the "more apt" videobuf2 framework for
video buffer management.

To support routing video data captured from a real V4L2 video capture
device with a "zero copy" operation on videobuffers (as they pass from
the V4L2 domain to UVC domain via a user-space application), we need to
support USER_PTR IO method at the UVC gadget side.

So the V4L2 capture device driver can still continue to use MMAP IO
method and now the user-space application can just pass a pointer to the
video buffers being dequeued from the V4L2 device side while queueing
them at the UVC gadget end. This ensures that we have a "zero-copy"
design as the videobuffers pass from the V4L2 capture device to the UVC
gadget.

Note that there will still be a need to apply UVC specific payload
headers on top of each UVC payload data, which will still require a copy
operation to be performed in the 'encode' routines of the UVC gadget.

This patch also addresses one issue found out while porting the UVC
gadget to videobuf2 framework:
	- In case the usb requests queued by the gadget get completed
	  with a status of -ESHUTDOWN (disconnected from host),
	  the queue of videobuf2 should be cancelled to ensure that the
	  application space daemon is not left in a state waiting for
	  a vb2 to be successfully absorbed at the USB side.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@st.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2013-04-02 11:42:48 +03:00
..
acm_ms.c usb: gadget: acm_ms: use function framework for ACM 2013-01-21 20:52:44 +02:00
amd5536udc.c usb: gadget: amd5536udc: don't assign gadget.dev.release directly 2013-03-18 11:17:46 +02:00
amd5536udc.h usb: gadget: amd5536udc: remove unused structure member 2013-03-18 11:16:56 +02:00
at91_udc.c usb: gadget: at91_udc: don't touch gadget.dev.driver 2013-03-18 11:17:32 +02:00
at91_udc.h
atmel_usba_udc.c usb: gadget: atmel_usba_udc: don't touch gadget.dev.driver 2013-03-18 11:17:33 +02:00
atmel_usba_udc.h usb: gadget: atmel: remove unused DMA_ADDR_INVALID 2013-03-18 11:18:11 +02:00
audio.c
bcm63xx_udc.c usb: gadget: bcm63xx_udc: don't assign gadget.dev.release directly 2013-03-18 11:17:46 +02:00
cdc2.c usb: gadget: cdc2: use function framework for ACM 2013-01-21 20:52:45 +02:00
composite.c usb: gadget: composite: fix kernel-doc warnings 2013-03-05 13:15:00 +02:00
config.c
dbgp.c usb: gadget: allocate & giveback serial ports instead hard code them 2013-01-21 20:52:43 +02:00
dummy_hcd.c usb: gadget: dummy: fix sparse warning 2013-03-27 13:18:58 +02:00
epautoconf.c
ether.c
f_acm.c usb: gadget: f_acm: use usb_gstrings_attach() 2013-01-21 20:52:48 +02:00
f_ecm.c
f_eem.c
f_fs.c fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
f_hid.c
f_loopback.c usb: gadget: convert source sink and loopback to new function interface 2013-01-21 20:52:40 +02:00
f_mass_storage.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
f_midi.c
f_ncm.c usb: gadget: ncm: make global variable ndp*_opts read only 2013-01-10 12:25:12 +02:00
f_obex.c usb: gadget: allocate & giveback serial ports instead hard code them 2013-01-21 20:52:43 +02:00
f_phonet.c
f_rndis.c
f_serial.c usb: gadget: allocate & giveback serial ports instead hard code them 2013-01-21 20:52:43 +02:00
f_sourcesink.c usb: gadget: convert source sink and loopback to new function interface 2013-01-21 20:52:40 +02:00
f_subset.c
f_uac1.c usb: gadget: f_uac1: silence an info leak warning 2013-03-04 13:13:58 +02:00
f_uac2.c usb: gadget: f_uac2: fix compile warning 2013-01-21 20:52:49 +02:00
f_uvc.c usb: gadget: uvc: Delay the status stage when setting alternate setting 1 2013-03-18 11:18:21 +02:00
f_uvc.h usb: gadget: uvc: Fix coding style issues introduced by SS support 2013-03-18 11:18:18 +02:00
fsl_mxc_udc.c usb: gadget: fsl_mxc_udc: replace MX35_IO_ADDRESS to ioremap 2013-01-18 14:08:21 +02:00
fsl_qe_udc.c usb: gadget: fsl_qe_udc: don't assign gadget.dev.release directly 2013-03-18 11:17:47 +02:00
fsl_qe_udc.h
fsl_udc_core.c usb: gadget: fsl_udc_core: Use module_platform_driver_probe macro 2013-03-18 11:18:00 +02:00
fsl_usb2_udc.h usb: gadget: fsl_mxc_udc: replace MX35_IO_ADDRESS to ioremap 2013-01-18 14:08:21 +02:00
functions.c usb: gadget: add a forward pointer from usb_function to its "instance" 2013-01-21 20:52:46 +02:00
fusb300_udc.c usb: gadget: fusb300_udc: don't assign gadget.dev.release directly 2013-03-18 11:17:48 +02:00
fusb300_udc.h usb: gadget: fusb300_udc: convert to udc_start/udc_stop 2013-01-24 21:11:28 +02:00
g_ffs.c
g_zero.h usb: gadget: convert source sink and loopback to new function interface 2013-01-21 20:52:40 +02:00
gadget_chips.h
gmidi.c usb: gadget: consider link speed for bMaxPower 2013-01-10 12:38:52 +02:00
goku_udc.c usb: gadget: goku_udc: don't assign gadget.dev.release directly 2013-03-18 11:17:49 +02:00
goku_udc.h usb: gadget: goku_udc: let udc-core manage gadget->dev 2013-03-18 11:16:45 +02:00
hid.c
imx_udc.c usb: gadget: imx_udc: don't touch gadget.dev.driver 2013-03-18 11:17:36 +02:00
imx_udc.h
inode.c fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
Kconfig usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework 2013-04-02 11:42:48 +03:00
lpc32xx_udc.c usb: gadget: lpc32xx_udc: don't touch gadget.dev.driver 2013-03-18 11:17:37 +02:00
m66592-udc.c usb: gadget: m66592-udc: don't assign gadget.dev.release directly 2013-03-18 11:17:49 +02:00
m66592-udc.h usb: gadget: m66592-udc: convert to udc_start/udc_stop 2013-01-24 21:11:29 +02:00
Makefile usb: gadget: make usb functions to load before gadget driver 2013-03-04 09:33:26 +02:00
mass_storage.c
multi.c usb: gadget: multi: use function framework for ACM 2013-01-21 20:52:45 +02:00
mv_u3d.h
mv_u3d_core.c usb: gadget: mv_u3d_core: remove unused clock 2013-04-02 11:42:47 +03:00
mv_udc.h usb: gadget: mv_udc_core: remove unused clock 2013-04-02 11:42:45 +03:00
mv_udc_core.c usb: gadget: mv_udc_core: remove unused clock 2013-04-02 11:42:45 +03:00
ncm.c
ndis.h
net2272.c usb: gadget: net2272: fix sparse warnings 2013-03-27 13:18:57 +02:00
net2272.h
net2280.c usb: gadget: net2280: fix sparse warnings 2013-03-27 13:18:58 +02:00
net2280.h
nokia.c usb: gadget: f_acm: convert to new function interface with backwards compatibility 2013-01-21 20:52:43 +02:00
omap_udc.c usb: gadget: omap_udc: don't assign gadget.dev.release directly 2013-03-18 11:17:53 +02:00
omap_udc.h
pch_udc.c usb: gadget: pch_udc: fix sparse warnings 2013-03-27 13:18:59 +02:00
printer.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
pxa25x_udc.c usb: gadget: pxa25x_udc: don't touch gadget.dev.driver 2013-03-18 11:17:41 +02:00
pxa25x_udc.h usb: gadget: pxa25x_udc: convert to udc_start/udc_stop 2013-01-24 21:11:31 +02:00
pxa27x_udc.c usb: gadget: pxa27x_udc: don't touch gadget.dev.driver 2013-03-18 11:17:41 +02:00
pxa27x_udc.h usb: gadget: pxa27x_udc: convert to udc_start/udc_stop 2013-01-24 21:11:31 +02:00
r8a66597-udc.c usb: gadget: r8a66597-udc: don't assign gadget.dev.release directly 2013-03-18 11:17:54 +02:00
r8a66597-udc.h
rndis.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
rndis.h
s3c-hsotg.c usb: gadget: s3c-hsotg: fix PHY error handling 2013-03-18 11:18:29 +02:00
s3c-hsotg.h
s3c-hsudc.c usb: gadget: s3c-hsudc: delete outdated comment 2013-03-18 11:18:10 +02:00
s3c2410_udc.c usb: gadget: s3c2410_udc: don't touch gadget.dev.driver 2013-03-18 11:17:43 +02:00
s3c2410_udc.h usb: gadget: s3c2410: convert to udc_start/udc_stop 2013-01-24 21:11:32 +02:00
serial.c usb: gadget: f_acm: convert to new function interface with backwards compatibility 2013-01-21 20:52:43 +02:00
storage_common.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
tcm_usb_gadget.c usb: gadget: tcm_usb_gadge: fix to return error or 0 in tcm_usbg_drop_nexus() 2012-12-13 12:04:00 +02:00
tcm_usb_gadget.h
u_ether.c ethtool: fix drvinfo strings set in drivers 2013-01-06 21:06:31 -08:00
u_ether.h
u_phonet.h
u_serial.c tty/serial patches for 3.9-rc1 2013-02-21 13:41:04 -08:00
u_serial.h usb: gadget: f_acm: convert to new function interface with backwards compatibility 2013-01-21 20:52:43 +02:00
u_uac1.c usb: gadget: u_uac1: NULL dereference on error path 2013-03-04 13:16:45 +02:00
u_uac1.h
udc-core.c usb: gadget: udc-core: anywone can read 'speed' attributes 2013-03-18 11:17:56 +02:00
usbstring.c
uvc.h usb: gadget: uvc: Delay the status stage when setting alternate setting 1 2013-03-18 11:18:21 +02:00
uvc_queue.c usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework 2013-04-02 11:42:48 +03:00
uvc_queue.h usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework 2013-04-02 11:42:48 +03:00
uvc_v4l2.c usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework 2013-04-02 11:42:48 +03:00
uvc_video.c usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework 2013-04-02 11:42:48 +03:00
webcam.c usb: gadget: consider link speed for bMaxPower 2013-01-10 12:38:52 +02:00
zero.c usb: gadget: fix two sparse warnings 2013-01-21 20:52:49 +02:00