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{ "id": 3311, "url": "https://patchwork.libcamera.org/api/1.1/covers/3311/?format=api", "web_url": "https://patchwork.libcamera.org/cover/3311/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20200324202844.1518292-1-jacopo@jmondi.org>", "date": "2020-03-24T20:28:40", "name": "[libcamera-devel,0/4] media: Register read-only sub-dev devnode", "submitter": { "id": 3, "url": "https://patchwork.libcamera.org/api/1.1/people/3/?format=api", "name": "Jacopo Mondi", "email": "jacopo@jmondi.org" }, "mbox": "https://patchwork.libcamera.org/cover/3311/mbox/", "series": [ { "id": 772, "url": "https://patchwork.libcamera.org/api/1.1/series/772/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=772", "date": "2020-03-24T20:28:40", "name": "media: Register read-only sub-dev devnode", "version": 1, "mbox": "https://patchwork.libcamera.org/series/772/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/covers/3311/comments/", "headers": { "Return-Path": "<jacopo@jmondi.org>", "Received": [ "from relay11.mail.gandi.net (relay11.mail.gandi.net\n\t[217.70.178.231])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id DF15F60411\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 24 Mar 2020 21:25:53 +0100 (CET)", "from localhost.localdomain (2-224-242-101.ip172.fastwebnet.it\n\t[2.224.242.101]) (Authenticated sender: jacopo@jmondi.org)\n\tby relay11.mail.gandi.net (Postfix) with ESMTPSA id 497B110000D;\n\tTue, 24 Mar 2020 20:25:51 +0000 (UTC)" ], "From": "Jacopo Mondi <jacopo@jmondi.org>", "To": "linux-media@vger.kernel.org,\n\tlibcamera-devel@lists.libcamera.org", "Cc": "Jacopo Mondi <jacopo@jmondi.org>, mchehab@kernel.org,\n\thverkuil-cisco@xs4all.nl, sakari.ailus@linux.intel.com", "Date": "Tue, 24 Mar 2020 21:28:40 +0100", "Message-Id": "<20200324202844.1518292-1-jacopo@jmondi.org>", "X-Mailer": "git-send-email 2.25.1", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH 0/4] media: Register read-only sub-dev\n\tdevnode", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "X-List-Received-Date": "Tue, 24 Mar 2020 20:25:54 -0000" }, "content": "Add new functio v4l2_device_register_ro_subdev_nodes() to pair with\nv4l2_device_register_subdev_nodes() that allows a bridge driver to register the\ndevice node for its subdevices in read-only mode.\n\ndevnode-centric (aka non-MC) bridge drivers control their subdevices through\ndirect calls to v4l2 subdev operations and do not want userspace to be able\nto control the subdevice configuration by calling ioctls on the sub-device\ndevnode. For this reason, they mostly refrain from registering any devnode at\nall for their subdevices.\n\nHowever it is sometimes required for userspace to access the sub-dev device\nnodes to collect information on the actual configuration, without changing\nthe one currently applied to the device.\n\nThis requirement became pressing while working on libcamera on devnode-centric\nplatforms that do not expose any sub-device for their camera sensor to prevent\nuserspace from changing their configuration. To allow them to register device\nnode and being guaranteed to retain control of the subdevice configuration this\nseries proposes a way to register device nodes in read-only to restrict\naccess to all ioctls that could potentially affect the sub-dev configuration.\n\nThanks\n j\n\nJacopo Mondi (4):\n Documentation: media: Document read-only subdevice\n media: v4l2-dev: Add v4l2_device_register_ro_subdev_node()\n media: bcm2835: Register sensor devnode as read-only\n media: bcm2835: Fix trivial whitespace error\n\n Documentation/media/kapi/v4l2-subdev.rst | 38 +++++++++++++++++++\n .../media/uapi/v4l/vidioc-g-dv-timings.rst | 6 +++\n Documentation/media/uapi/v4l/vidioc-g-std.rst | 6 +++\n .../media/uapi/v4l/vidioc-subdev-g-crop.rst | 9 +++++\n .../media/uapi/v4l/vidioc-subdev-g-fmt.rst | 8 ++++\n .../v4l/vidioc-subdev-g-frame-interval.rst | 8 ++++\n .../uapi/v4l/vidioc-subdev-g-selection.rst | 8 ++++\n .../media/platform/bcm2835/bcm2835-unicam.c | 4 +-\n drivers/media/v4l2-core/v4l2-device.c | 16 +++++++-\n drivers/media/v4l2-core/v4l2-subdev.c | 19 ++++++++++\n include/media/v4l2-dev.h | 7 ++++\n include/media/v4l2-device.h | 10 +++++\n 12 files changed, 136 insertions(+), 3 deletions(-)\n\n--\n2.25.1" }