[PATCH v4 08/13] media: i2c: imx214: Implement vflip/hflip controls

["André Apitzsch via B4 Relay" <devnull+git.apitzsch.eu@kernel.org>]

From: André Apitzsch <git@apitzsch.eu>

The imx214 sensor supports horizontal and vertical flipping. Add
appropriate controls to the driver.

Acked-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: André Apitzsch <git@apitzsch.eu>
---
 drivers/media/i2c/imx214.c | 69 ++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 61 insertions(+), 8 deletions(-)

diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
index 804814f3e5886369090c6ac36c57fa07cde6d5ac..880b4bc506d898181965737f3f8262fadf70a5fe 100644
--- a/drivers/media/i2c/imx214.c
+++ b/drivers/media/i2c/imx214.c
@@ -30,7 +30,6 @@
 #define IMX214_DEFAULT_LINK_FREQ 480000000
 #define IMX214_DEFAULT_PIXEL_RATE ((IMX214_DEFAULT_LINK_FREQ * 8LL) / 10)
 #define IMX214_FPS 30
-#define IMX214_MBUS_CODE MEDIA_BUS_FMT_SRGGB10_1X10
 
 /* V-TIMING internal */
 #define IMX214_REG_FRM_LENGTH_LINES	CCI_REG16(0x0340)
@@ -182,6 +181,22 @@ static const char * const imx214_supply_name[] = {
 
 #define IMX214_NUM_SUPPLIES ARRAY_SIZE(imx214_supply_name)
 
+/*
+ * The supported formats.
+ * This table MUST contain 4 entries per format, to cover the various flip
+ * combinations in the order
+ * - no flip
+ * - h flip
+ * - v flip
+ * - h&v flips
+ */
+static const u32 imx214_mbus_formats[] = {
+	MEDIA_BUS_FMT_SRGGB10_1X10,
+	MEDIA_BUS_FMT_SGRBG10_1X10,
+	MEDIA_BUS_FMT_SGBRG10_1X10,
+	MEDIA_BUS_FMT_SBGGR10_1X10,
+};
+
 struct imx214 {
 	struct device *dev;
 	struct clk *xclk;
@@ -197,6 +212,10 @@ struct imx214 {
 	struct v4l2_ctrl *hblank;
 	struct v4l2_ctrl *exposure;
 	struct v4l2_ctrl *unit_size;
+	struct {
+		struct v4l2_ctrl *hflip;
+		struct v4l2_ctrl *vflip;
+	};
 
 	const struct imx214_mode *cur_mode;
 
@@ -360,7 +379,6 @@ static const struct cci_reg_sequence mode_table_common[] = {
 
 	/* global setting */
 	/* basic config */
-	{ IMX214_REG_ORIENTATION, 0 },
 	{ IMX214_REG_MASK_CORR_FRAMES, IMX214_CORR_FRAMES_MASK },
 	{ IMX214_REG_FAST_STANDBY_CTRL, 1 },
 	{ IMX214_REG_LINE_LENGTH_PCK, IMX214_PPL_DEFAULT },
@@ -539,11 +557,21 @@ static int __maybe_unused imx214_power_off(struct device *dev)
 	return 0;
 }
 
+/* Get bayer order based on flip setting. */
+static u32 imx214_get_format_code(struct imx214 *imx214)
+{
+	unsigned int i;
+
+	i = (imx214->vflip->val ? 2 : 0) | (imx214->hflip->val ? 1 : 0);
+
+	return imx214_mbus_formats[i];
+}
+
 static void imx214_update_pad_format(struct imx214 *imx214,
 				     const struct imx214_mode *mode,
 				     struct v4l2_mbus_framefmt *fmt, u32 code)
 {
-	fmt->code = IMX214_MBUS_CODE;
+	fmt->code = imx214_get_format_code(imx214);
 	fmt->width = mode->width;
 	fmt->height = mode->height;
 	fmt->field = V4L2_FIELD_NONE;
@@ -559,10 +587,12 @@ static int imx214_enum_mbus_code(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_state *sd_state,
 				 struct v4l2_subdev_mbus_code_enum *code)
 {
-	if (code->index > 0)
+	struct imx214 *imx214 = to_imx214(sd);
+
+	if (code->index >= (ARRAY_SIZE(imx214_mbus_formats) / 4))
 		return -EINVAL;
 
-	code->code = IMX214_MBUS_CODE;
+	code->code = imx214_get_format_code(imx214);
 
 	return 0;
 }
@@ -571,7 +601,11 @@ static int imx214_enum_frame_size(struct v4l2_subdev *subdev,
 				  struct v4l2_subdev_state *sd_state,
 				  struct v4l2_subdev_frame_size_enum *fse)
 {
-	if (fse->code != IMX214_MBUS_CODE)
+	struct imx214 *imx214 = to_imx214(subdev);
+	u32 code;
+
+	code = imx214_get_format_code(imx214);
+	if (fse->code != code)
 		return -EINVAL;
 
 	if (fse->index >= ARRAY_SIZE(imx214_modes))
@@ -705,6 +739,7 @@ static int imx214_entity_init_state(struct v4l2_subdev *subdev,
 	struct v4l2_subdev_format fmt = { };
 
 	fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+	fmt.format.code = MEDIA_BUS_FMT_SRGGB10_1X10;
 	fmt.format.width = imx214_modes[0].width;
 	fmt.format.height = imx214_modes[0].height;
 
@@ -748,6 +783,11 @@ static int imx214_set_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_EXPOSURE:
 		cci_write(imx214->regmap, IMX214_REG_EXPOSURE, ctrl->val, &ret);
 		break;
+	case V4L2_CID_HFLIP:
+	case V4L2_CID_VFLIP:
+		cci_write(imx214->regmap, IMX214_REG_ORIENTATION,
+			  imx214->hflip->val | imx214->vflip->val << 1, &ret);
+		break;
 	case V4L2_CID_VBLANK:
 		cci_write(imx214->regmap, IMX214_REG_FRM_LENGTH_LINES,
 			  format->height + ctrl->val, &ret);
@@ -786,7 +826,7 @@ static int imx214_ctrls_init(struct imx214 *imx214)
 		return ret;
 
 	ctrl_hdlr = &imx214->ctrls;
-	ret = v4l2_ctrl_handler_init(&imx214->ctrls, 8);
+	ret = v4l2_ctrl_handler_init(&imx214->ctrls, 10);
 	if (ret)
 		return ret;
 
@@ -835,6 +875,18 @@ static int imx214_ctrls_init(struct imx214 *imx214)
 					     IMX214_EXPOSURE_STEP,
 					     exposure_def);
 
+	imx214->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx214_ctrl_ops,
+					  V4L2_CID_HFLIP, 0, 1, 1, 0);
+	if (imx214->hflip)
+		imx214->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
+
+	imx214->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx214_ctrl_ops,
+					  V4L2_CID_VFLIP, 0, 1, 1, 0);
+	if (imx214->vflip)
+		imx214->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
+
+	v4l2_ctrl_cluster(2, &imx214->hflip);
+
 	imx214->unit_size = v4l2_ctrl_new_std_compound(ctrl_hdlr,
 				NULL,
 				V4L2_CID_UNIT_CELL_SIZE,
@@ -966,6 +1018,7 @@ static int imx214_enum_frame_interval(struct v4l2_subdev *subdev,
 				struct v4l2_subdev_state *sd_state,
 				struct v4l2_subdev_frame_interval_enum *fie)
 {
+	struct imx214 *imx214 = to_imx214(subdev);
 	const struct imx214_mode *mode;
 
 	dev_warn_once(imx214->dev, "frame_interval functions return an unreliable value for compatibility reasons. Use the VBLANK and HBLANK controls to determine the correct frame rate.\n");
@@ -977,7 +1030,7 @@ static int imx214_enum_frame_interval(struct v4l2_subdev *subdev,
 				ARRAY_SIZE(imx214_modes), width, height,
 				fie->width, fie->height);
 
-	fie->code = IMX214_MBUS_CODE;
+	fie->code = imx214_get_format_code(imx214);
 	fie->width = mode->width;
 	fie->height = mode->height;
 	fie->interval.numerator = 1;

-- 
2.47.1