kernel/drivers/usb/gadget/uvc_queue.c, branch linux-rolling-stable

usb: gadget: Gadget directory cleanup - group usb functions

2014-07-16T17:50:36Z

The drivers/usb/gadget directory contains many files. Files which are related can be distributed into separate directories. This patch moves the USB functions implementations into a separate directory. Signed-off-by: Andrzej Pietrasiewicz Signed-off-by: Felipe Balbi

usb: gadget: uvc: Set the vb2 queue timestamp flags

2014-05-15T16:07:56Z

The vb2 queue timestamp_flags field must be set by drivers, as enforced by a WARN_ON in vb2_queue_init. The UVC gadget driver failed to do so. This resulted in the following warning. [ 2.104371] g_webcam gadget: uvc_function_bind [ 2.105567] ------------[ cut here ]------------ [ 2.105567] ------------[ cut here ]------------ [ 2.106779] WARNING: CPU: 0 PID: 1 at drivers/media/v4l2-core/videobuf2-core.c:2207 vb2_queue_init+0xa3/0x113() Fix it. Reported-by: Fengguang Wu Signed-off-by: Laurent Pinchart Reviewed-by: Hans Verkuil Acked-by: Felipe Balbi Signed-off-by: Felipe Balbi

usb: gadget: uvc: Set the V4L2 buffer field to V4L2_FIELD_NONE

2014-05-15T16:07:52Z

The UVC gadget driver doesn't support interlaced video but left the buffer field uninitialized. Set it to V4L2_FIELD_NONE. Signed-off-by: Laurent Pinchart Reviewed-by: Hans Verkuil Acked-by: Felipe Balbi Signed-off-by: Felipe Balbi

usb: gadget: uvc: Switch to monotonic clock for buffer timestamps

2014-05-15T16:07:47Z

The wall time clock isn't useful for applications as it can jump around due to time adjustement. Switch to the monotonic clock. Signed-off-by: Laurent Pinchart Reviewed-by: Hans Verkuil Acked-by: Felipe Balbi Signed-off-by: Felipe Balbi

usb: gadget: uvc: Fix error handling in uvc_queue_buffer()

2013-08-09T14:40:54Z

The conversion to videobuf2 failed to check the return value of vb2_qbuf(). Fix it. Cc: stable@vger.kernel.org Reported-by: Michael Grzeschik Signed-off-by: Laurent Pinchart Tested-By: Michael Grzeschik Signed-off-by: Felipe Balbi

usb: gadget: uvc: Implement videobuf2 .wait_prepare and .wait_finish operations

2013-06-04T20:27:50Z

Those optional operations are used to release and reacquire the queue lock when videobuf2 needs to perform operations that sleep for a long time, such as waiting for a buffer to be complete. Implement them to avoid blocking qbuf or streamoff calls when a dqbuf is in progress. Signed-off-by: Michael Grzeschik Signed-off-by: Felipe Balbi

usb: gadget/uvc: Add support for 'get_unmapped_area' for MMUless architectures

2013-04-02T08:42:49Z

This patch adds the support for 'get_unmapped_area' in UVC gadget which is called when the 'mmap' system call is executed on MMUless architectures. Signed-off-by: Bhupesh Sharma Signed-off-by: Laurent Pinchart

usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework

2013-04-02T08:42:48Z

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 Signed-off-by: Laurent Pinchart

[media] usb: gadget/uvc: Remove non-required locking from 'uvc_queue_next_buffer' routine

2012-04-10T18:46:02Z

This patch removes the non-required spinlock acquire/release calls on 'queue_irqlock' from 'uvc_queue_next_buffer' routine. This routine is called from 'video->encode' function (which translates to either 'uvc_video_encode_bulk' or 'uvc_video_encode_isoc') in 'uvc_video.c'. As, the 'video->encode' routines are called with 'queue_irqlock' already held, so acquiring a 'queue_irqlock' again in 'uvc_queue_next_buffer' routine causes a spin lock recursion. Signed-off-by: Bhupesh Sharma Acked-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab

usb gadget: clean up FSF boilerplate text

2011-09-09T23:00:09Z

remove the following two paragraphs as they are not needed: This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc.,59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Signed-off-by: Klaus Schwarzkopf Signed-off-by: Greg Kroah-Hartman