linux-kernel - [RFC 4/5] media: i2c: ov5670: Report the camera location

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Date:   Wed, 14 Aug 2019 22:28:14 +0200
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jacopo Mondi <jacopo@...ndi.org>,
        linux-media@...r.kernel.org (open list:MEDIA INPUT INFRASTRUCTURE
        (V4L/DVB)), linux-kernel@...r.kernel.org (open list)
Subject: [RFC 4/5] media: i2c: ov5670: Report the camera location

The camera location is retrieved from the firmware interface parsing
the "location" device property and reported through the read-only
V4L2_CID_LOCATION control.

Signed-off-by: Jacopo Mondi <jacopo@...ndi.org>
---
 drivers/media/i2c/ov5670.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/media/i2c/ov5670.c b/drivers/media/i2c/ov5670.c
index 041fcbb4eebd..1446aef1fc1e 100644
--- a/drivers/media/i2c/ov5670.c
+++ b/drivers/media/i2c/ov5670.c
@@ -2059,10 +2059,12 @@ static const struct v4l2_ctrl_ops ov5670_ctrl_ops = {
 /* Initialize control handlers */
 static int ov5670_init_controls(struct ov5670 *ov5670)
 {
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5670->sd);
 	struct v4l2_ctrl_handler *ctrl_hdlr;
 	s64 vblank_max;
 	s64 vblank_def;
 	s64 vblank_min;
+	u32 location;
 	s64 exposure_max;
 	int ret;
 
@@ -2124,6 +2126,15 @@ static int ov5670_init_controls(struct ov5670 *ov5670)
 				     ARRAY_SIZE(ov5670_test_pattern_menu) - 1,
 				     0, 0, ov5670_test_pattern_menu);
 
+	ret = device_property_read_u32(&client->dev, "location", &location);
+	if (!ret) {
+		v4l2_ctrl_new_std(ctrl_hdlr, &ov5670_ctrl_ops,
+				  V4L2_CID_LOCATION, V4L2_LOCATION_FRONT,
+				  V4L2_LOCATION_BACK, 1,
+				  location == V4L2_LOCATION_FRONT ?
+				  V4L2_LOCATION_FRONT : V4L2_LOCATION_BACK);
+	}
+
 	if (ctrl_hdlr->error) {
 		ret = ctrl_hdlr->error;
 		goto error;
-- 
2.22.0