This patch series adds two new features to the V4L2 framework. The first 5 patches add support for VIDIOC_G/S_PRIORITY. All prio handling will be done in the core for any driver that either uses struct v4l2_fh (ivtv only at the moment) or has no open and release file operations (true for many simple (radio) drivers). In all other cases the driver will have to do the work. Eventually all drivers should either use v4l2_fh or never set filp->private_data. All drivers that use the control framework must also use core-prio handling since control handling is no longer done through v4l2_ioctl_ops, so the driver doesn't have an easy way of checking the priority before changing a control. By default all device nodes use the same priority state in v4l2_device, but drivers can assign the prio field in video_device to a different priority state, allowing e.g. all capture device nodes to use a different priority from all the display device nodes. The v4l2_ioctl.c code will check the ioctls whether or not they are allowed based on the current priority. The vidioc_default callback has a new argument that just tells the driver whether the prio is OK or not. The driver can use this argument to return -EBUSY for those commands that modify state of the driver. The following three patches implement this in ivtv and update the documentation. The last two patches add a release callback in v4l2_device which will be called when the last registered device node is removed. This is very useful for implementing the hotplug disconnect functionality as it provides a single clean up callback when the last user of any of the unregistered device nodes has closed its filehandle. For drivers with just a single device node this is not very relevant since the video_device release() does the same job, but for drivers that create multiple device nodes (e.g. usbvision) this is a must-have. An example of how this would be used can be found in the dsbr100 patches in this branch: http://git.linuxtv.org/hverkuil/media_tree.git?a=shortlog;h=refs/heads/usbvision Comments? Regards, Hans Hans Verkuil (10): v4l2_prio: move from v4l2-common to v4l2-dev. v4l2: add v4l2_prio_state to v4l2_device and video_device v4l2-fh: implement v4l2_priority support. v4l2-dev: add and support flag V4L2_FH_USE_PRIO. v4l2-ioctl: add priority handling support. ivtv: convert to core priority handling. ivtv: use core-assisted locking. v4l2-framework: update documentation for new prio field v4l2-device: add kref and a release function v4l2-framework.txt: document new v4l2_device release() callback Documentation/video4linux/v4l2-framework.txt | 34 ++++++++- drivers/media/radio/radio-si4713.c | 3 +- drivers/media/video/cx18/cx18-ioctl.c | 3 +- drivers/media/video/davinci/vpfe_capture.c | 2 +- drivers/media/video/ivtv/ivtv-driver.h | 2 - drivers/media/video/ivtv/ivtv-fileops.c | 17 +---- drivers/media/video/ivtv/ivtv-ioctl.c | 77 +++++--------------- drivers/media/video/ivtv/ivtv-streams.c | 1 + drivers/media/video/meye.c | 3 +- drivers/media/video/mxb.c | 3 +- drivers/media/video/v4l2-common.c | 63 ---------------- drivers/media/video/v4l2-dev.c | 101 +++++++++++++++++++++++++- drivers/media/video/v4l2-device.c | 16 ++++ drivers/media/video/v4l2-fh.c | 4 + drivers/media/video/v4l2-ioctl.c | 73 +++++++++++++++++-- include/media/v4l2-common.h | 15 ---- include/media/v4l2-dev.h | 24 ++++++ include/media/v4l2-device.h | 14 ++++ include/media/v4l2-fh.h | 1 + include/media/v4l2-ioctl.h | 2 +- 20 files changed, 286 insertions(+), 172 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
