From ee95eb32c4202a2d290af6c754806ef3bdfb3fda Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Tue, 7 Jul 2020 11:23:48 +0100
Subject: [PATCH] media: i2c: imx290: Add support for g_selection to
 report cropping

Userspace needs to know the cropping arrangements for each mode,
so expose this through g_selection.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/imx290.c | 84 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

--- a/drivers/media/i2c/imx290.c
+++ b/drivers/media/i2c/imx290.c
@@ -61,6 +61,13 @@ enum imx290_clk_index {
 #define IMX290_PGCTRL_THRU BIT(1)
 #define IMX290_PGCTRL_MODE(n) ((n) << 4)
 
+#define IMX290_NATIVE_WIDTH		1945U
+#define IMX290_NATIVE_HEIGHT		1109U
+#define IMX290_PIXEL_ARRAY_LEFT		4U
+#define IMX290_PIXEL_ARRAY_TOP		12U
+#define IMX290_PIXEL_ARRAY_WIDTH	1937U
+#define IMX290_PIXEL_ARRAY_HEIGHT	1097U
+
 static const char * const imx290_supply_name[] = {
 	"vdda",
 	"vddd",
@@ -80,6 +87,7 @@ struct imx290_mode {
 	u32 hmax;
 	u32 vmax;
 	u8 link_freq_index;
+	struct v4l2_rect crop;
 
 	const struct imx290_regval *data;
 	u32 data_size;
@@ -384,6 +392,12 @@ static const struct imx290_mode imx290_m
 		.hmax = 0x1130,
 		.vmax = 0x0465,
 		.link_freq_index = FREQ_INDEX_1080P,
+		.crop = {
+			.left = 4 + 8,
+			.top = 12 + 8,
+			.width = 1920,
+			.height = 1080,
+		},
 		.data = imx290_1080p_settings,
 		.data_size = ARRAY_SIZE(imx290_1080p_settings),
 		.clk_data = {
@@ -398,6 +412,12 @@ static const struct imx290_mode imx290_m
 		.hmax = 0x19c8,
 		.vmax = 0x02ee,
 		.link_freq_index = FREQ_INDEX_720P,
+		.crop = {
+			.left = 4 + 8 + 320,
+			.top = 12 + 8 + 180,
+			.width = 1280,
+			.height = 720,
+		},
 		.data = imx290_720p_settings,
 		.data_size = ARRAY_SIZE(imx290_720p_settings),
 		.clk_data = {
@@ -415,6 +435,12 @@ static const struct imx290_mode imx290_m
 		.hmax = 0x0898,
 		.vmax = 0x0465,
 		.link_freq_index = FREQ_INDEX_1080P,
+		.crop = {
+			.left = 4 + 8,
+			.top = 12 + 8,
+			.width = 1920,
+			.height = 1080,
+		},
 		.data = imx290_1080p_settings,
 		.data_size = ARRAY_SIZE(imx290_1080p_settings),
 		.clk_data = {
@@ -429,6 +455,12 @@ static const struct imx290_mode imx290_m
 		.hmax = 0x0ce4,
 		.vmax = 0x02ee,
 		.link_freq_index = FREQ_INDEX_720P,
+		.crop = {
+			.left = 4 + 8 + 320,
+			.top = 12 + 8 + 180,
+			.width = 1280,
+			.height = 720,
+		},
 		.data = imx290_720p_settings,
 		.data_size = ARRAY_SIZE(imx290_720p_settings),
 		.clk_data = {
@@ -875,6 +907,57 @@ static int imx290_write_current_format(s
 	return 0;
 }
 
+static const struct v4l2_rect *
+__imx290_get_pad_crop(struct imx290 *imx290, struct v4l2_subdev_pad_config *cfg,
+		      unsigned int pad, enum v4l2_subdev_format_whence which)
+{
+	switch (which) {
+	case V4L2_SUBDEV_FORMAT_TRY:
+		return v4l2_subdev_get_try_crop(&imx290->sd, cfg, pad);
+	case V4L2_SUBDEV_FORMAT_ACTIVE:
+		return &imx290->current_mode->crop;
+	}
+
+	return NULL;
+}
+
+static int imx290_get_selection(struct v4l2_subdev *sd,
+				struct v4l2_subdev_pad_config *cfg,
+				struct v4l2_subdev_selection *sel)
+{
+	switch (sel->target) {
+	case V4L2_SEL_TGT_CROP: {
+		struct imx290 *imx290 = to_imx290(sd);
+
+		mutex_lock(&imx290->lock);
+		sel->r = *__imx290_get_pad_crop(imx290, cfg, sel->pad,
+						sel->which);
+		mutex_unlock(&imx290->lock);
+
+		return 0;
+	}
+
+	case V4L2_SEL_TGT_NATIVE_SIZE:
+		sel->r.top = 0;
+		sel->r.left = 0;
+		sel->r.width = IMX290_NATIVE_WIDTH;
+		sel->r.height = IMX290_NATIVE_HEIGHT;
+
+		return 0;
+
+	case V4L2_SEL_TGT_CROP_DEFAULT:
+	case V4L2_SEL_TGT_CROP_BOUNDS:
+		sel->r.top = IMX290_PIXEL_ARRAY_TOP;
+		sel->r.left = IMX290_PIXEL_ARRAY_LEFT;
+		sel->r.width = IMX290_PIXEL_ARRAY_WIDTH;
+		sel->r.height = IMX290_PIXEL_ARRAY_HEIGHT;
+
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
 /* Start streaming */
 static int imx290_start_streaming(struct imx290 *imx290)
 {
@@ -1073,6 +1156,7 @@ static const struct v4l2_subdev_pad_ops
 	.enum_frame_size = imx290_enum_frame_size,
 	.get_fmt = imx290_get_fmt,
 	.set_fmt = imx290_set_fmt,
+	.get_selection = imx290_get_selection,
 };
 
 static const struct v4l2_subdev_ops imx290_subdev_ops = {