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From: "Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>
To: Helen Koike <helen.koike@collabora.com>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	linux-media@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
	"Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>
Subject: [PATCH v3 1/5] v4l2-dev/ioctl: Add V4L2_CAP_IO_MC
Date: Mon, 13 Jan 2020 00:24:54 +0100	[thread overview]
Message-ID: <20200112232458.2844506-2-niklas.soderlund+renesas@ragnatech.se> (raw)
In-Reply-To: <20200112232458.2844506-1-niklas.soderlund+renesas@ragnatech.se>

Add a video device capability flag to indicate that its inputs and/or
outputs are controlled by the Media Controller instead of the V4L2 API.
When this flag is set, ioctl for enum inputs and outputs are
automatically enabled and programmed to call a helper function.

As a bonus fallback default handlers for VIDIOC_{G,S}_{INPUT,OUTPUT} are
provided which can be used by drivers who only provide one input/output.
Such drivers need just not declare vidioc_{g,s}_{input,output} in its
struct v4l2_ioctl_ops and v4l2 will fallback to the single input/output
defaults.

Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
* Changes since v2
- Merged the two patches touching V4L2 core stuff to a single patch.
- Updated documentation for V4L2_CAP_IO_MC
- Added is_io_mc bool in determine_valid_ioctls()
- Folded or moved code closer to where it's used
- Remove unneeded memset()
- Use strscpy() instead of strlcpy()
---
 .../media/uapi/v4l/vidioc-querycap.rst        |  5 ++
 .../media/videodev2.h.rst.exceptions          |  1 +
 drivers/media/v4l2-core/v4l2-dev.c            | 19 +++--
 drivers/media/v4l2-core/v4l2-ioctl.c          | 69 +++++++++++++++++--
 include/uapi/linux/videodev2.h                |  2 +
 5 files changed, 86 insertions(+), 10 deletions(-)

diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst
index 5f9930195d624c73..da17e0e3c6f9a571 100644
--- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
+++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
@@ -264,6 +264,11 @@ specification the ioctl returns an ``EINVAL`` error code.
     * - ``V4L2_CAP_TOUCH``
       - 0x10000000
       - This is a touch device.
+    * - ``V4L2_CAP_IO_MC``
+      - 0x20000000
+      - There is only one input and/or output seen from userspace. Which I/O
+        entity is routed to the input/output is controlled by the Media
+        Controller. See :ref:`media_controller`.
     * - ``V4L2_CAP_DEVICE_CAPS``
       - 0x80000000
       - The driver fills the ``device_caps`` field. This capability can
diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index cb6ccf91776e6b56..a625fb90e3a989a7 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -176,6 +176,7 @@ replace define V4L2_CAP_STREAMING device-capabilities
 replace define V4L2_CAP_META_OUTPUT device-capabilities
 replace define V4L2_CAP_DEVICE_CAPS device-capabilities
 replace define V4L2_CAP_TOUCH device-capabilities
+replace define V4L2_CAP_IO_MC device-capabilities
 
 # V4L2 pix flags
 replace define V4L2_PIX_FMT_PRIV_MAGIC :c:type:`v4l2_pix_format`
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index da42d172714adcb5..3c1a1200aa1fa9f3 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -552,6 +552,7 @@ static void determine_valid_ioctls(struct video_device *vdev)
 		       (vdev->device_caps & meta_caps);
 	bool is_rx = vdev->vfl_dir != VFL_DIR_TX;
 	bool is_tx = vdev->vfl_dir != VFL_DIR_RX;
+	bool is_io_mc = vdev->device_caps & V4L2_CAP_IO_MC;
 
 	bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);
 
@@ -725,22 +726,28 @@ static void determine_valid_ioctls(struct video_device *vdev)
 		SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std);
 		if (is_rx) {
 			SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
-			SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
-			SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
-			SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
+			set_bit(_IOC_NR(VIDIOC_G_INPUT), valid_ioctls);
+			set_bit(_IOC_NR(VIDIOC_S_INPUT), valid_ioctls);
 			SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
 			SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
 			SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
 			SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
 			SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid);
+			if (is_io_mc)
+				set_bit(_IOC_NR(VIDIOC_ENUMINPUT), valid_ioctls);
+			else
+				SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
 		}
 		if (is_tx) {
-			SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
-			SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
-			SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
+			set_bit(_IOC_NR(VIDIOC_G_OUTPUT), valid_ioctls);
+			set_bit(_IOC_NR(VIDIOC_S_OUTPUT), valid_ioctls);
 			SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
 			SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
 			SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
+			if (is_io_mc)
+				set_bit(_IOC_NR(VIDIOC_ENUMOUTPUT), valid_ioctls);
+			else
+				SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
 		}
 		if (ops->vidioc_g_parm || ops->vidioc_g_std)
 			set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index aaf83e25427288fd..e8e15deeb8f36a9d 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1085,6 +1085,28 @@ static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
 	return ret;
 }
 
+static int v4l_g_input(const struct v4l2_ioctl_ops *ops,
+		       struct file *file, void *fh, void *arg)
+{
+	if (!ops->vidioc_g_input) {
+		*(unsigned int *)arg = 0;
+		return 0;
+	}
+
+	return ops->vidioc_g_input(file, fh, arg);
+}
+
+static int v4l_g_output(const struct v4l2_ioctl_ops *ops,
+		       struct file *file, void *fh, void *arg)
+{
+	if (!ops->vidioc_g_output) {
+		*(unsigned int *)arg = 0;
+		return 0;
+	}
+
+	return ops->vidioc_g_output(file, fh, arg);
+}
+
 static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
@@ -1094,12 +1116,19 @@ static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
 	ret = v4l_enable_media_source(vfd);
 	if (ret)
 		return ret;
+
+	if (!ops->vidioc_s_input)
+		return  *(unsigned int *)arg ? -EINVAL : 0;
+
 	return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
 }
 
 static int v4l_s_output(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
+	if (!ops->vidioc_s_output)
+		return  *(unsigned int *)arg ? -EINVAL : 0;
+
 	return ops->vidioc_s_output(file, fh, *(unsigned int *)arg);
 }
 
@@ -1128,6 +1157,20 @@ static int v4l_s_priority(const struct v4l2_ioctl_ops *ops,
 	return v4l2_prio_change(vfd->prio, &vfh->prio, *p);
 }
 
+static int v4l2_ioctl_enum_input_mc(struct file *file, void *priv,
+				    struct v4l2_input *i)
+{
+	struct video_device *vfd = video_devdata(file);
+
+	if (i->index)
+		return -EINVAL;
+
+	strscpy(i->name, vfd->name, sizeof(i->name));
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+
+	return 0;
+}
+
 static int v4l_enuminput(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
@@ -1143,9 +1186,26 @@ static int v4l_enuminput(const struct v4l2_ioctl_ops *ops,
 	if (is_valid_ioctl(vfd, VIDIOC_S_STD))
 		p->capabilities |= V4L2_IN_CAP_STD;
 
+	if (vfd->device_caps & V4L2_CAP_IO_MC)
+		return v4l2_ioctl_enum_input_mc(file, fh, p);
+
 	return ops->vidioc_enum_input(file, fh, p);
 }
 
+static int v4l2_ioctl_enum_output_mc(struct file *file, void *priv,
+				     struct v4l2_output *o)
+{
+	struct video_device *vfd = video_devdata(file);
+
+	if (o->index)
+		return -EINVAL;
+
+	strscpy(o->name, vfd->name, sizeof(o->name));
+	o->type = V4L2_OUTPUT_TYPE_ANALOG;
+
+	return 0;
+}
+
 static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
@@ -1161,6 +1221,9 @@ static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops,
 	if (is_valid_ioctl(vfd, VIDIOC_S_STD))
 		p->capabilities |= V4L2_OUT_CAP_STD;
 
+	if (vfd->device_caps & V4L2_CAP_IO_MC)
+		return v4l2_ioctl_enum_output_mc(file, fh, p);
+
 	return ops->vidioc_enum_output(file, fh, p);
 }
 
@@ -2678,10 +2741,8 @@ DEFINE_V4L_STUB_FUNC(expbuf)
 DEFINE_V4L_STUB_FUNC(g_std)
 DEFINE_V4L_STUB_FUNC(g_audio)
 DEFINE_V4L_STUB_FUNC(s_audio)
-DEFINE_V4L_STUB_FUNC(g_input)
 DEFINE_V4L_STUB_FUNC(g_edid)
 DEFINE_V4L_STUB_FUNC(s_edid)
-DEFINE_V4L_STUB_FUNC(g_output)
 DEFINE_V4L_STUB_FUNC(g_audout)
 DEFINE_V4L_STUB_FUNC(s_audout)
 DEFINE_V4L_STUB_FUNC(g_jpegcomp)
@@ -2730,11 +2791,11 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = {
 	IOCTL_INFO(VIDIOC_S_AUDIO, v4l_stub_s_audio, v4l_print_audio, INFO_FL_PRIO),
 	IOCTL_INFO(VIDIOC_QUERYCTRL, v4l_queryctrl, v4l_print_queryctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_queryctrl, id)),
 	IOCTL_INFO(VIDIOC_QUERYMENU, v4l_querymenu, v4l_print_querymenu, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_querymenu, index)),
-	IOCTL_INFO(VIDIOC_G_INPUT, v4l_stub_g_input, v4l_print_u32, 0),
+	IOCTL_INFO(VIDIOC_G_INPUT, v4l_g_input, v4l_print_u32, 0),
 	IOCTL_INFO(VIDIOC_S_INPUT, v4l_s_input, v4l_print_u32, INFO_FL_PRIO),
 	IOCTL_INFO(VIDIOC_G_EDID, v4l_stub_g_edid, v4l_print_edid, INFO_FL_ALWAYS_COPY),
 	IOCTL_INFO(VIDIOC_S_EDID, v4l_stub_s_edid, v4l_print_edid, INFO_FL_PRIO | INFO_FL_ALWAYS_COPY),
-	IOCTL_INFO(VIDIOC_G_OUTPUT, v4l_stub_g_output, v4l_print_u32, 0),
+	IOCTL_INFO(VIDIOC_G_OUTPUT, v4l_g_output, v4l_print_u32, 0),
 	IOCTL_INFO(VIDIOC_S_OUTPUT, v4l_s_output, v4l_print_u32, INFO_FL_PRIO),
 	IOCTL_INFO(VIDIOC_ENUMOUTPUT, v4l_enumoutput, v4l_print_enumoutput, INFO_FL_CLEAR(v4l2_output, index)),
 	IOCTL_INFO(VIDIOC_G_AUDOUT, v4l_stub_g_audout, v4l_print_audioout, 0),
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 5f9357dcb0602126..c793263a37052856 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -487,6 +487,8 @@ struct v4l2_capability {
 
 #define V4L2_CAP_TOUCH                  0x10000000  /* Is a touch device */
 
+#define V4L2_CAP_IO_MC			0x20000000  /* Is input/output controlled by the media controller */
+
 #define V4L2_CAP_DEVICE_CAPS            0x80000000  /* sets device capabilities field */
 
 /*
-- 
2.24.1


  reply	other threads:[~2020-01-12 23:25 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-12 23:24 [PATCH v3 0/5] v4l2-dev/ioctl: Add V4L2_CAP_IO_MC Niklas Söderlund
2020-01-12 23:24 ` Niklas Söderlund [this message]
2020-01-13 12:09   ` [PATCH v3 1/5] " Sakari Ailus
2020-02-14 13:14     ` Hans Verkuil
2020-01-22 21:50   ` Helen Koike
2020-02-14 13:25     ` Hans Verkuil
2020-02-14 14:06       ` Helen Koike
2020-02-14 13:29   ` Hans Verkuil
2020-01-12 23:24 ` [PATCH v3 2/5] rcar-vin: Use default VIDIOC_{G,S}_{INPUT,OUTPUT} handler Niklas Söderlund
2020-01-12 23:24 ` [PATCH v3 3/5] staging/intel-ipu3: " Niklas Söderlund
2020-01-12 23:24 ` [PATCH v3 4/5] rcar-vin: Make use of V4L2_CAP_IO_MC Niklas Söderlund
2020-01-12 23:24 ` [PATCH v3 5/5] staging/intel-ipu3: " Niklas Söderlund

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