linux-kernel - [PATCH v3 11/11] media: adv748x: allow the HDMI sub-device to accept EDID

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Date:   Fri, 20 Mar 2020 17:12:06 +0100
From:   Alex Riesen <alexander.riesen@...itec.com>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>
CC:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        "Laurent Pinchart" <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        <devel@...verdev.osuosl.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>
Subject: [PATCH v3 11/11] media: adv748x: allow the HDMI sub-device to accept
 EDID

This makes it possible to load a EDID reported by the device
with v4l2-ctl utility:

  vdev=/dev/$(grep -l '^adv748x.*hdmi$' /sys/class/video4linux/v4l-subdev*/name |cut -d/ -f5-5)
  v4l2-ctl -d $vdev --set-edid=pad=0,file=/etc/adv7482.edid

Signed-off-by: Alexander Riesen <alexander.riesen@...itec.com>

--

I would like to avoid doing that, but found no other way yet.
Suggestions very welcome.
---
 drivers/media/i2c/adv748x/adv748x-hdmi.c | 27 ++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/media/i2c/adv748x/adv748x-hdmi.c b/drivers/media/i2c/adv748x/adv748x-hdmi.c
index 664930e55baf..fea133472911 100644
--- a/drivers/media/i2c/adv748x/adv748x-hdmi.c
+++ b/drivers/media/i2c/adv748x/adv748x-hdmi.c
@@ -775,7 +775,34 @@ static int adv748x_hdmi_log_status(struct v4l2_subdev *sd)
 	return 0;
 }
 
+static long adv748x_hdmi_querycap(struct adv748x_hdmi *hdmi,
+				  struct v4l2_capability *cap)
+{
+	struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
+
+	cap->version = LINUX_VERSION_CODE;
+	strlcpy(cap->driver, state->dev->driver->name, sizeof(cap->driver));
+	strlcpy(cap->card, "hdmi", sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "i2c:%d-%04x",
+		 i2c_adapter_id(state->client->adapter),
+		 state->client->addr);
+	cap->device_caps = V4L2_CAP_AUDIO | V4L2_CAP_VIDEO_CAPTURE;
+	cap->capabilities = V4L2_CAP_DEVICE_CAPS;
+	return 0;
+}
+
+static long adv748x_hdmi_ioctl(struct v4l2_subdev *sd,
+			       unsigned int cmd, void *arg)
+{
+	struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
+
+	if (cmd == VIDIOC_QUERYCAP)
+		return adv748x_hdmi_querycap(hdmi, arg);
+	return -ENOTTY;
+}
+
 static const struct v4l2_subdev_core_ops adv748x_core_ops_hdmi = {
+	.ioctl = adv748x_hdmi_ioctl,
 	.log_status = adv748x_hdmi_log_status,
 };
 
-- 
2.25.1.25.g9ecbe7eb18