From patchwork Sat Apr 18 10:32:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11496507 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E9C8A13B2 for ; Sat, 18 Apr 2020 10:29:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D26232220A for ; Sat, 18 Apr 2020 10:29:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725939AbgDRK3a (ORCPT ); Sat, 18 Apr 2020 06:29:30 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:54305 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725799AbgDRK3a (ORCPT ); Sat, 18 Apr 2020 06:29:30 -0400 X-Originating-IP: 87.13.136.104 Received: from uno.homenet.telecomitalia.it (unknown [87.13.136.104]) (Authenticated sender: jacopo@jmondi.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id E66E160002; Sat, 18 Apr 2020 10:29:23 +0000 (UTC) From: Jacopo Mondi To: linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org Cc: Jacopo Mondi , mchehab@kernel.org, hverkuil-cisco@xs4all.nl, sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org, laurent.pinchart@ideasonboard.com Subject: [PATCH v4 1/5] Documentation: media: Update sub-device API intro Date: Sat, 18 Apr 2020 12:32:12 +0200 Message-Id: <20200418103216.140572-2-jacopo@jmondi.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200418103216.140572-1-jacopo@jmondi.org> References: <20200418103216.140572-1-jacopo@jmondi.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Update the V4L2 sub-device userspace API introduction to provide more details on why complex devices might want to register devnodes for the connected subdevices. Acked-by: Sakari Ailus Suggested-by: Laurent Pinchart Signed-off-by: Jacopo Mondi --- Documentation/driver-api/media/v4l2-subdev.rst | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/Documentation/driver-api/media/v4l2-subdev.rst b/Documentation/driver-api/media/v4l2-subdev.rst index 29e07e23f888..41ccb3e5c707 100644 --- a/Documentation/driver-api/media/v4l2-subdev.rst +++ b/Documentation/driver-api/media/v4l2-subdev.rst @@ -275,8 +275,13 @@ system the .unbind() method is called. All three callbacks are optional. V4L2 sub-device userspace API ----------------------------- -Beside exposing a kernel API through the :c:type:`v4l2_subdev_ops` structure, -V4L2 sub-devices can also be controlled directly by userspace applications. +Bridge drivers traditionally expose one or multiple video nodes to userspace, +and control subdevices through the :c:type:`v4l2_subdev_ops` operations in +response to video node operations. This hides the complexity of the underlying +hardware from applications. For complex devices, finer-grained control of the +device than what the video nodes offer may be required. In those cases, bridge +drivers that implement :ref:`the media controller API ` may +opt for making the subdevice operations directly accessible from userpace. Device nodes named ``v4l-subdev``\ *X* can be created in ``/dev`` to access sub-devices directly. If a sub-device supports direct userspace configuration From patchwork Sat Apr 18 10:32:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11496509 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6D6E01392 for ; Sat, 18 Apr 2020 10:29:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A0802220A for ; Sat, 18 Apr 2020 10:29:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725950AbgDRK3l (ORCPT ); Sat, 18 Apr 2020 06:29:41 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:42905 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725799AbgDRK3k (ORCPT ); Sat, 18 Apr 2020 06:29:40 -0400 X-Originating-IP: 87.13.136.104 Received: from uno.homenet.telecomitalia.it (unknown [87.13.136.104]) (Authenticated sender: jacopo@jmondi.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 70B7260003; Sat, 18 Apr 2020 10:29:29 +0000 (UTC) From: Jacopo Mondi To: linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org Cc: Jacopo Mondi , mchehab@kernel.org, hverkuil-cisco@xs4all.nl, sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org, laurent.pinchart@ideasonboard.com Subject: [PATCH v4 2/5] Documentation: media: Document read-only subdevice Date: Sat, 18 Apr 2020 12:32:13 +0200 Message-Id: <20200418103216.140572-3-jacopo@jmondi.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200418103216.140572-1-jacopo@jmondi.org> References: <20200418103216.140572-1-jacopo@jmondi.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Document a new kAPI function to register subdev device nodes in read only mode and for each affected ioctl report how access is restricted. Acked-by: Sakari Ailus Signed-off-by: Jacopo Mondi --- .../driver-api/media/v4l2-subdev.rst | 44 +++++++++++++++++++ .../userspace-api/media/v4l/dev-subdev.rst | 5 +++ .../media/v4l/vidioc-g-dv-timings.rst | 6 +++ .../userspace-api/media/v4l/vidioc-g-std.rst | 6 +++ .../media/v4l/vidioc-subdev-g-crop.rst | 9 ++++ .../media/v4l/vidioc-subdev-g-fmt.rst | 8 ++++ .../v4l/vidioc-subdev-g-frame-interval.rst | 8 ++++ .../media/v4l/vidioc-subdev-g-selection.rst | 8 ++++ 8 files changed, 94 insertions(+) diff --git a/Documentation/driver-api/media/v4l2-subdev.rst b/Documentation/driver-api/media/v4l2-subdev.rst index 41ccb3e5c707..6ced2381952a 100644 --- a/Documentation/driver-api/media/v4l2-subdev.rst +++ b/Documentation/driver-api/media/v4l2-subdev.rst @@ -332,6 +332,50 @@ Private ioctls All ioctls not in the above list are passed directly to the sub-device driver through the core::ioctl operation. +Read-only sub-device userspace API +---------------------------------- + +Bridge drivers that control their connected subdevices through direct calls to +the kernel API realized by :c:type:`v4l2_subdev_ops` structure do not usually +want userspace to be able to change the same parameters through the subdevice +device node and thus do not usually register any. + +It is sometimes useful to report to userspace the current subdevice +configuration through a read-only API, that does not permit applications to +change to the device parameters but allows interfacing to the subdevice device +node to inspect them. + +For instance, to implement cameras based on computational photography, userspace +needs to know the detailed camera sensor configuration (in terms of skipping, +binning, cropping and scaling) for each supported output resolution. To support +such use cases, bridge drivers may expose the subdevice operations to userspace +through a read-only API. + +To create a read-only device node for all the subdevices registered with the +``V4L2_SUBDEV_FL_HAS_DEVNODE`` set, the :c:type:`v4l2_device` driver should call +:c:func:`v4l2_device_register_ro_subdev_nodes`. + +Access to the following ioctls for userspace applications is restricted on +sub-device device nodes registered with +:c:func:`v4l2_device_register_ro_subdev_nodes`. + +``VIDIOC_SUBDEV_S_FMT``, +``VIDIOC_SUBDEV_S_CROP``, +``VIDIOC_SUBDEV_S_SELECTION``: + + These ioctls are only allowed on a read-only subdevice device node + for the :ref:`V4L2_SUBDEV_FORMAT_TRY ` + formats and selection rectangles. + +``VIDIOC_SUBDEV_S_FRAME_INTERVAL``, +``VIDIOC_SUBDEV_S_DV_TIMINGS``, +``VIDIOC_SUBDEV_S_STD``: + + These ioctls are not allowed on a read-only subdevice node. + +In case the ioctl is not allowed, or the format to modify is set to +``V4L2_SUBDEV_FORMAT_ACTIVE``, the core returns a negative error code and +the errno variable is set to ``-EPERM``. I2C sub-device drivers ---------------------- diff --git a/Documentation/userspace-api/media/v4l/dev-subdev.rst b/Documentation/userspace-api/media/v4l/dev-subdev.rst index 0c1a5f50ee21..134d2fb909fa 100644 --- a/Documentation/userspace-api/media/v4l/dev-subdev.rst +++ b/Documentation/userspace-api/media/v4l/dev-subdev.rst @@ -39,6 +39,11 @@ will feature a character device node on which ioctls can be called to Sub-device character device nodes, conventionally named ``/dev/v4l-subdev*``, use major number 81. +Drivers may opt to limit the sub-device character devices to only expose +operations that do not modify the device state. In such a case the sub-devices +are referred to as ``read-only`` in the rest of this documentation, and the +related restrictions are documented in individual ioctls. + Controls ======== diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst b/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst index 84806a893cb7..9a035a4ea0f0 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst @@ -57,6 +57,10 @@ pointer to the struct :c:type:`v4l2_dv_timings` structure as argument. If the ioctl is not supported or the timing values are not correct, the driver returns ``EINVAL`` error code. +Calling ``VIDIOC_SUBDEV_S_DV_TIMINGS`` on a subdev device node that has been +registered in read-only mode is not allowed. An error is returned and the errno +variable is set to ``-EPERM``. + The ``linux/v4l2-dv-timings.h`` header can be used to get the timings of the formats in the :ref:`cea861` and :ref:`vesadmt` standards. If the current input or output does not support DV timings (e.g. if @@ -81,6 +85,8 @@ ENODATA EBUSY The device is busy and therefore can not change the timings. +EPERM + ``VIDIOC_SUBDEV_S_DV_TIMINGS`` has been called on a read-only subdevice. .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}| diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-std.rst b/Documentation/userspace-api/media/v4l/vidioc-g-std.rst index b0bdb719d405..6d8cb7f29ac6 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-std.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-std.rst @@ -66,6 +66,9 @@ video timings (e.g. if :ref:`VIDIOC_ENUMINPUT` does not set the ``V4L2_IN_CAP_STD`` flag), then ``ENODATA`` error code is returned. +Calling ``VIDIOC_SUBDEV_S_STD`` on a subdev device node that has been registered +in read-only mode is not allowed. An error is returned and the errno variable is +set to ``-EPERM``. Return Value ============ @@ -79,3 +82,6 @@ EINVAL ENODATA Standard video timings are not supported for this input or output. + +EPERM + ``VIDIOC_SUBDEV_S_STD`` has been called on a read-only subdevice. diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-crop.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-crop.rst index 8d9fc13015a6..615e3efdf935 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-crop.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-crop.rst @@ -73,6 +73,11 @@ crop rectangles and stored in the sub-device file handle. Two applications querying the same sub-device would thus not interact with each other. +If the subdev device node has been registered in read-only mode, calls to +``VIDIOC_SUBDEV_S_CROP`` are only valid if the ``which`` field is set to +``V4L2_SUBDEV_FORMAT_TRY``, otherwise an error is returned and the errno +variable is set to ``-EPERM``. + Drivers must not return an error solely because the requested crop rectangle doesn't match the device capabilities. They must instead modify the rectangle to match what the hardware can provide. The @@ -123,3 +128,7 @@ EINVAL references a non-existing pad, the ``which`` field references a non-existing format, or cropping is not supported on the given subdev pad. + +EPERM + The ``VIDIOC_SUBDEV_S_CROP`` ioctl has been called on a read-only subdevice + and the ``which`` field is set to ``V4L2_SUBDEV_FORMAT_ACTIVE``. diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-fmt.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-fmt.rst index 69d60e18664b..909ee9f90867 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-fmt.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-fmt.rst @@ -78,6 +78,11 @@ current links configuration or sub-device controls value. For instance, a low-pass noise filter might crop pixels at the frame boundaries, modifying its output frame size. +If the subdev device node has been registered in read-only mode, calls to +``VIDIOC_SUBDEV_S_FMT`` are only valid if the ``which`` field is set to +``V4L2_SUBDEV_FORMAT_TRY``, otherwise an error is returned and the errno +variable is set to ``-EPERM``. + Drivers must not return an error solely because the requested format doesn't match the device capabilities. They must instead modify the format to match what the hardware can provide. The modified format @@ -146,6 +151,9 @@ EINVAL ``pad`` references a non-existing pad, or the ``which`` field references a non-existing format. +EPERM + The ``VIDIOC_SUBDEV_S_FMT`` ioctl has been called on a read-only subdevice + and the ``which`` field is set to ``V4L2_SUBDEV_FORMAT_ACTIVE``. ============ diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst index b61baaf11624..51e1bff797f0 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst @@ -65,6 +65,10 @@ struct contains the current frame interval as would be returned by a ``VIDIOC_SUBDEV_G_FRAME_INTERVAL`` call. +Calling ``VIDIOC_SUBDEV_S_FRAME_INTERVAL`` on a subdev device node that has been +registered in read-only mode is not allowed. An error is returned and the errno +variable is set to ``-EPERM``. + Drivers must not return an error solely because the requested interval doesn't match the device capabilities. They must instead modify the interval to match what the hardware can provide. The modified interval @@ -118,3 +122,7 @@ EINVAL :c:type:`v4l2_subdev_frame_interval` ``pad`` references a non-existing pad, or the pad doesn't support frame intervals. + +EPERM + The ``VIDIOC_SUBDEV_S_FRAME_INTERVAL`` ioctl has been called on a read-only + subdevice. diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-selection.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-selection.rst index 981c95df2dec..06c9553ac48f 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-selection.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-selection.rst @@ -53,6 +53,10 @@ function of the crop API, and more, are supported by the selections API. See :ref:`subdev` for more information on how each selection target affects the image processing pipeline inside the subdevice. +If the subdev device node has been registered in read-only mode, calls to +``VIDIOC_SUBDEV_S_SELECTION`` are only valid if the ``which`` field is set to +``V4L2_SUBDEV_FORMAT_TRY``, otherwise an error is returned and the errno +variable is set to ``-EPERM``. Types of selection targets -------------------------- @@ -123,3 +127,7 @@ EINVAL ``pad`` references a non-existing pad, the ``which`` field references a non-existing format, or the selection target is not supported on the given subdev pad. + +EPERM + The ``VIDIOC_SUBDEV_S_SELECTION`` ioctl has been called on a read-only + subdevice and the ``which`` field is set to ``V4L2_SUBDEV_FORMAT_ACTIVE``. From patchwork Sat Apr 18 10:32:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11496511 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A49311392 for ; Sat, 18 Apr 2020 10:29:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8FA2A21D79 for ; Sat, 18 Apr 2020 10:29:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725991AbgDRK3r (ORCPT ); Sat, 18 Apr 2020 06:29:47 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:51199 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725893AbgDRK3q (ORCPT ); Sat, 18 Apr 2020 06:29:46 -0400 X-Originating-IP: 87.13.136.104 Received: from uno.homenet.telecomitalia.it (unknown [87.13.136.104]) (Authenticated sender: jacopo@jmondi.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id CD0AD60007; Sat, 18 Apr 2020 10:29:38 +0000 (UTC) From: Jacopo Mondi To: linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org Cc: Jacopo Mondi , mchehab@kernel.org, hverkuil-cisco@xs4all.nl, sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org, laurent.pinchart@ideasonboard.com Subject: [PATCH v4 3/5] media: v4l2-dev: Add v4l2_device_register_ro_subdev_node() Date: Sat, 18 Apr 2020 12:32:14 +0200 Message-Id: <20200418103216.140572-4-jacopo@jmondi.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200418103216.140572-1-jacopo@jmondi.org> References: <20200418103216.140572-1-jacopo@jmondi.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add to the V4L2 core a function to register device nodes for video subdevices in read-only mode. Registering a device node in read-only mode is useful to expose to userspace the current sub-device configuration, without allowing application to change it by using the V4L2 subdevice ioctls. Acked-by: Sakari Ailus Signed-off-by: Jacopo Mondi --- drivers/media/v4l2-core/v4l2-device.c | 7 ++-- drivers/media/v4l2-core/v4l2-subdev.c | 19 ++++++++++ include/media/v4l2-dev.h | 7 ++++ include/media/v4l2-device.h | 50 ++++++++++++++++++++++++--- 4 files changed, 77 insertions(+), 6 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c index c69941214bb2..de4287251a89 100644 --- a/drivers/media/v4l2-core/v4l2-device.c +++ b/drivers/media/v4l2-core/v4l2-device.c @@ -186,7 +186,8 @@ static void v4l2_device_release_subdev_node(struct video_device *vdev) kfree(vdev); } -int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev) +int __v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev, + bool read_only) { struct video_device *vdev; struct v4l2_subdev *sd; @@ -215,6 +216,8 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev) vdev->fops = &v4l2_subdev_fops; vdev->release = v4l2_device_release_subdev_node; vdev->ctrl_handler = sd->ctrl_handler; + if (read_only) + set_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags); err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1, sd->owner); if (err < 0) { @@ -252,7 +255,7 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev) return err; } -EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes); +EXPORT_SYMBOL_GPL(__v4l2_device_register_subdev_nodes); void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) { diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index a376b351135f..1dc263c2ca0a 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -331,6 +331,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) struct v4l2_fh *vfh = file->private_data; #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); + bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags); #endif int rval; @@ -477,6 +478,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) case VIDIOC_SUBDEV_S_FMT: { struct v4l2_subdev_format *format = arg; + if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) + return -EPERM; + memset(format->reserved, 0, sizeof(format->reserved)); memset(format->format.reserved, 0, sizeof(format->format.reserved)); return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format); @@ -504,6 +508,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) struct v4l2_subdev_crop *crop = arg; struct v4l2_subdev_selection sel; + if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) + return -EPERM; + memset(crop->reserved, 0, sizeof(crop->reserved)); memset(&sel, 0, sizeof(sel)); sel.which = crop->which; @@ -545,6 +552,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) case VIDIOC_SUBDEV_S_FRAME_INTERVAL: { struct v4l2_subdev_frame_interval *fi = arg; + if (ro_subdev) + return -EPERM; + memset(fi->reserved, 0, sizeof(fi->reserved)); return v4l2_subdev_call(sd, video, s_frame_interval, arg); } @@ -568,6 +578,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) case VIDIOC_SUBDEV_S_SELECTION: { struct v4l2_subdev_selection *sel = arg; + if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) + return -EPERM; + memset(sel->reserved, 0, sizeof(sel->reserved)); return v4l2_subdev_call( sd, pad, set_selection, subdev_fh->pad, sel); @@ -604,6 +617,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) return v4l2_subdev_call(sd, video, g_dv_timings, arg); case VIDIOC_SUBDEV_S_DV_TIMINGS: + if (ro_subdev) + return -EPERM; + return v4l2_subdev_call(sd, video, s_dv_timings, arg); case VIDIOC_SUBDEV_G_STD: @@ -612,6 +628,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) case VIDIOC_SUBDEV_S_STD: { v4l2_std_id *std = arg; + if (ro_subdev) + return -EPERM; + return v4l2_subdev_call(sd, video, s_std, *std); } diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 4602c15ff878..ad2d41952442 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -82,11 +82,18 @@ struct v4l2_ctrl_handler; * but the old crop API will still work as expected in order to preserve * backwards compatibility. * Never set this flag for new drivers. + * @V4L2_FL_SUBDEV_RO_DEVNODE: + * indicates that the video device node is registered in read-only mode. + * The flag only applies to device nodes registered for sub-devices, it is + * set by the core when the sub-devices device nodes are registered with + * v4l2_device_register_ro_subdev_nodes() and used by the sub-device ioctl + * handler to restrict access to some ioctl calls. */ enum v4l2_video_device_flags { V4L2_FL_REGISTERED = 0, V4L2_FL_USES_V4L2_FH = 1, V4L2_FL_QUIRK_INVERTED_CROP = 2, + V4L2_FL_SUBDEV_RO_DEVNODE = 3, }; /* Priority helper functions */ diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h index 7c912b7d2870..64ec4de948e9 100644 --- a/include/media/v4l2-device.h +++ b/include/media/v4l2-device.h @@ -174,14 +174,56 @@ int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); /** - * v4l2_device_register_subdev_nodes - Registers device nodes for all subdevs - * of the v4l2 device that are marked with - * the %V4L2_SUBDEV_FL_HAS_DEVNODE flag. + * __v4l2_device_register_ro_subdev_nodes - Registers device nodes for + * all subdevs of the v4l2 device that are marked with the + * %V4L2_SUBDEV_FL_HAS_DEVNODE flag. * * @v4l2_dev: pointer to struct v4l2_device + * @read_only: subdevices read-only flag. True to register the subdevices + * device nodes in read-only mode, false to allow full access to the + * subdevice userspace API. */ int __must_check -v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev); +__v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev, + bool read_only); + +/** + * v4l2_device_register_subdev_nodes - Registers subdevices device nodes with + * unrestricted access to the subdevice userspace operations + * + * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation + * for more details. + * + * @v4l2_dev: pointer to struct v4l2_device + */ +static inline int __must_check +v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev) +{ +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) + return __v4l2_device_register_subdev_nodes(v4l2_dev, false); +#else + return 0; +#endif +} + +/** + * v4l2_device_register_ro_subdev_nodes - Registers subdevices device nodes + * in read-only mode + * + * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation + * for more details. + * + * @v4l2_dev: pointer to struct v4l2_device + */ +static inline int __must_check +v4l2_device_register_ro_subdev_nodes(struct v4l2_device *v4l2_dev) +{ +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) + return __v4l2_device_register_subdev_nodes(v4l2_dev, true); +#else + return 0; +#endif +} /** * v4l2_subdev_notify - Sends a notification to v4l2_device. From patchwork Sat Apr 18 10:32:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11496513 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 761D71871 for ; Sat, 18 Apr 2020 10:30:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66B4421D79 for ; Sat, 18 Apr 2020 10:30:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726006AbgDRKaA (ORCPT ); Sat, 18 Apr 2020 06:30:00 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:54423 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725893AbgDRK37 (ORCPT ); Sat, 18 Apr 2020 06:29:59 -0400 X-Originating-IP: 87.13.136.104 Received: from uno.homenet.telecomitalia.it (unknown [87.13.136.104]) (Authenticated sender: jacopo@jmondi.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 4617060002; Sat, 18 Apr 2020 10:29:44 +0000 (UTC) From: Jacopo Mondi To: linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org Cc: Jacopo Mondi , mchehab@kernel.org, hverkuil-cisco@xs4all.nl, sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org, laurent.pinchart@ideasonboard.com, Hans Verkuil Subject: [PATCH v4 4/5] v4l2-subdev: add VIDIOC_SUBDEV_QUERYCAP ioctl Date: Sat, 18 Apr 2020 12:32:15 +0200 Message-Id: <20200418103216.140572-5-jacopo@jmondi.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200418103216.140572-1-jacopo@jmondi.org> References: <20200418103216.140572-1-jacopo@jmondi.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Hans Verkuil While normal video/radio/vbi/swradio nodes have a proper QUERYCAP ioctl that apps can call to determine that it is indeed a V4L2 device, there is currently no equivalent for v4l-subdev nodes. Adding this ioctl will solve that, and it will allow utilities like v4l2-compliance to be used with these devices as well. SUBDEV_QUERYCAP currently returns the version and subdev_caps of the subdevice. Define as the initial set of subdev_caps the read-only or read/write flags, to signal to userspace which set of IOCTLs are available on the subdevice. Signed-off-by: Hans Verkuil Signed-off-by: Jacopo Mondi Reported-by: kbuild test robot --- drivers/media/v4l2-core/v4l2-subdev.c | 12 ++++++++++++ include/uapi/linux/v4l2-subdev.h | 15 +++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 1dc263c2ca0a..ca0aa54429c5 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include @@ -336,6 +337,17 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) int rval; switch (cmd) { + case VIDIOC_SUBDEV_QUERYCAP: { + struct v4l2_subdev_capability *cap = arg; + + memset(cap, 0, sizeof(*cap)); + cap->version = LINUX_VERSION_CODE; + cap->subdev_caps |= ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV + : V4L2_SUBDEV_CAP_RW_SUBDEV; + + return 0; + } + case VIDIOC_QUERYCTRL: /* * TODO: this really should be folded into v4l2_queryctrl (this diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h index 03970ce30741..0886f88be193 100644 --- a/include/uapi/linux/v4l2-subdev.h +++ b/include/uapi/linux/v4l2-subdev.h @@ -155,9 +155,24 @@ struct v4l2_subdev_selection { __u32 reserved[8]; }; +/** + * struct v4l2_subdev_capability - subdev capabilities + * @device_caps: the subdev capabilities, see V4L2_SUBDEV_CAP_*. + */ +struct v4l2_subdev_capability { + __u32 version; + __u32 subdev_caps; +}; + +/* The v4l2 sub-device video device node is registered in read-only mode. */ +#define V4L2_SUBDEV_CAP_RO_SUBDEV (1 << 0) +/* The v4l2 sub-device video device node is registered in read/write mode. */ +#define V4L2_SUBDEV_CAP_RW_SUBDEV (1 << 1) + /* Backwards compatibility define --- to be removed */ #define v4l2_subdev_edid v4l2_edid +#define VIDIOC_SUBDEV_QUERYCAP _IOR('V', 0, struct v4l2_subdev_capability) #define VIDIOC_SUBDEV_G_FMT _IOWR('V', 4, struct v4l2_subdev_format) #define VIDIOC_SUBDEV_S_FMT _IOWR('V', 5, struct v4l2_subdev_format) #define VIDIOC_SUBDEV_G_FRAME_INTERVAL _IOWR('V', 21, struct v4l2_subdev_frame_interval) From patchwork Sat Apr 18 10:32:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11496515 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 884AD1392 for ; Sat, 18 Apr 2020 10:30:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76B8A2220A for ; Sat, 18 Apr 2020 10:30:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725893AbgDRKaL (ORCPT ); Sat, 18 Apr 2020 06:30:11 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:53699 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725869AbgDRKaK (ORCPT ); Sat, 18 Apr 2020 06:30:10 -0400 X-Originating-IP: 87.13.136.104 Received: from uno.homenet.telecomitalia.it (unknown [87.13.136.104]) (Authenticated sender: jacopo@jmondi.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 914C660007; Sat, 18 Apr 2020 10:29:58 +0000 (UTC) From: Jacopo Mondi To: linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org Cc: Jacopo Mondi , mchehab@kernel.org, hverkuil-cisco@xs4all.nl, sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org, laurent.pinchart@ideasonboard.com, Hans Verkuil Subject: [PATCH v4 5/5] v4l: document VIDIOC_SUBDEV_QUERYCAP Date: Sat, 18 Apr 2020 12:32:16 +0200 Message-Id: <20200418103216.140572-6-jacopo@jmondi.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200418103216.140572-1-jacopo@jmondi.org> References: <20200418103216.140572-1-jacopo@jmondi.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Hans Verkuil Add documentation for the new VIDIOC_SUBDEV_QUERYCAP ioctl. Signed-off-by: Hans Verkuil Signed-off-by: Jacopo Mondi Acked-by: Sakari Ailus --- .../userspace-api/media/v4l/user-func.rst | 1 + .../media/v4l/vidioc-subdev-querycap.rst | 114 ++++++++++++++++++ 2 files changed, 115 insertions(+) create mode 100644 Documentation/userspace-api/media/v4l/vidioc-subdev-querycap.rst diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst index f235f88efe89..559cce421d41 100644 --- a/Documentation/userspace-api/media/v4l/user-func.rst +++ b/Documentation/userspace-api/media/v4l/user-func.rst @@ -78,6 +78,7 @@ Function Reference vidioc-subdev-g-fmt vidioc-subdev-g-frame-interval vidioc-subdev-g-selection + vidioc-subdev-querycap.rst vidioc-subscribe-event func-mmap func-munmap diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-querycap.rst new file mode 100644 index 000000000000..d9b2e19e1339 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-querycap.rst @@ -0,0 +1,114 @@ +.. Permission is granted to copy, distribute and/or modify this +.. document under the terms of the GNU Free Documentation License, +.. Version 1.1 or any later version published by the Free Software +.. Foundation, with no Invariant Sections, no Front-Cover Texts +.. and no Back-Cover Texts. A copy of the license is included at +.. Documentation/userspace-api/media/fdl-appendix.rst. +.. + +.. _VIDIOC_SUBDEV_QUERYCAP: + +**************************** +ioctl VIDIOC_SUBDEV_QUERYCAP +**************************** + +Name +==== + +VIDIOC_SUBDEV_QUERYCAP - Query sub-device capabilities + + +Synopsis +======== + +.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_QUERYCAP, struct v4l2_subdev_capability *argp ) + :name: VIDIOC_SUBDEV_QUERYCAP + + +Arguments +========= + +``fd`` + File descriptor returned by :ref:`open() `. + +``argp`` + Pointer to struct :c:type:`v4l2_subdev_capability`. + + +Description +=========== + +All V4L2 sub-devices support the +``VIDIOC_SUBDEV_QUERYCAP`` ioctl. It is used to identify +kernel devices compatible with this specification and to obtain +information about driver and hardware capabilities. The ioctl takes a +pointer to a struct :c:type:`v4l2_subdev_capability` which is filled by the +driver. When the driver is not compatible with this specification the ioctl +returns ``ENOTTY`` error code. + +.. tabularcolumns:: |p{1.5cm}|p{2.5cm}|p{13cm}| + +.. c:type:: v4l2_subdev_capability + +.. flat-table:: struct v4l2_subdev_capability + :header-rows: 0 + :stub-columns: 0 + :widths: 3 4 20 + + * - __u32 + - ``version`` + - Version number of the driver. + + The version reported is provided by the V4L2 subsystem following the + kernel numbering scheme. However, it may not always return the same + version as the kernel if, for example, a stable or + distribution-modified kernel uses the V4L2 stack from a newer kernel. + + The version number is formatted using the ``KERNEL_VERSION()`` + macro: + * - :cspan:`2` + + ``#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))`` + + ``__u32 version = KERNEL_VERSION(0, 8, 1);`` + + ``printf ("Version: %u.%u.%u\\n",`` + + ``(version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);`` + * - __u32 + - ``subdev_caps`` + - Sub-device capabilities of the opened device, see + :ref:`subdevice-capabilities`. + +.. tabularcolumns:: |p{6cm}|p{2.2cm}|p{8.8cm}| + +.. _subdevice-capabilities: + +.. cssclass:: longtable + +.. flat-table:: Sub-Device Capabilities Flags + :header-rows: 0 + :stub-columns: 0 + :widths: 3 1 4 + + * - V4L2_SUBDEV_CAP_RO_SUBDEV + - 0x00000001 + - The sub-device device node is registered in read-only mode. + Access to the sub-device ioctls that modify the device state is + restricted. Refer to each individual subdevice ioctl documentation + for a description of which restrictions apply to a read-only sub-device. + + * - V4L2_SUBDEV_CAP_RW_SUBDEV + - 0x00000002 + - The sub-device device node is registered in read/write mode, all the + subdevice ioctls are accessible from userspace. + +Return Value +============ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes ` chapter. + +ENOTTY + The device node is not a V4L2 sub-device.