[PATCH v2 10/10] media: adv748x: allow the HDMI sub-device to accept EDID

[Alex Riesen <alexander.riesen@cetitec.com>]

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@cetitec.com>
---
 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 7655d817ceb6..88e309de3d56 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