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From 6e8b94f48ce58e2b9c09000eb77642f3633a6b0b Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Wed, 23 Mar 2022 15:48:49 +0000
Subject: [PATCH] media: i2c: imx258: Add get_selection for pixel array
 information

Libcamera requires the cropping information for each mode, so
add this information to the driver.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/imx258.c | 90 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -78,6 +78,14 @@
 #define REG_CONFIG_MIRROR_VFLIP                0x02
 #define REG_CONFIG_FLIP_TEST_PATTERN   0x02
 
+/* IMX258 native and active pixel array size. */
+#define IMX258_NATIVE_WIDTH            4224U
+#define IMX258_NATIVE_HEIGHT           3192U
+#define IMX258_PIXEL_ARRAY_LEFT                8U
+#define IMX258_PIXEL_ARRAY_TOP         16U
+#define IMX258_PIXEL_ARRAY_WIDTH       4208U
+#define IMX258_PIXEL_ARRAY_HEIGHT      3120U
+
 struct imx258_reg {
        u16 address;
        u8 val;
@@ -116,6 +124,9 @@ struct imx258_mode {
        u32 link_freq_index;
        /* Default register values */
        struct imx258_reg_list reg_list;
+
+       /* Analog crop rectangle. */
+       struct v4l2_rect crop;
 };
 
 /* 4208x3120 needs 1267Mbps/lane, 4 lanes. Use that rate on 2 lanes as well */
@@ -774,6 +785,12 @@ static const struct imx258_mode supporte
                        .regs = mode_4208x3120_regs,
                },
                .link_freq_index = IMX258_LINK_FREQ_1267MBPS,
+               .crop = {
+                       .left = IMX258_PIXEL_ARRAY_LEFT,
+                       .top = IMX258_PIXEL_ARRAY_TOP,
+                       .width = 4208,
+                       .height = 3120,
+               },
        },
        {
                .width = 2104,
@@ -785,6 +802,12 @@ static const struct imx258_mode supporte
                        .regs = mode_2104_1560_regs,
                },
                .link_freq_index = IMX258_LINK_FREQ_640MBPS,
+               .crop = {
+                       .left = IMX258_PIXEL_ARRAY_LEFT,
+                       .top = IMX258_PIXEL_ARRAY_TOP,
+                       .width = 4208,
+                       .height = 3120,
+               },
        },
        {
                .width = 1048,
@@ -796,6 +819,12 @@ static const struct imx258_mode supporte
                        .regs = mode_1048_780_regs,
                },
                .link_freq_index = IMX258_LINK_FREQ_640MBPS,
+               .crop = {
+                       .left = IMX258_PIXEL_ARRAY_LEFT,
+                       .top = IMX258_PIXEL_ARRAY_TOP,
+                       .width = 4208,
+                       .height = 3120,
+               },
        },
 };
 
@@ -930,6 +959,7 @@ static int imx258_open(struct v4l2_subde
        struct imx258 *imx258 = to_imx258(sd);
        struct v4l2_mbus_framefmt *try_fmt =
                v4l2_subdev_get_try_format(sd, fh->state, 0);
+       struct v4l2_rect *try_crop;
 
        /* Initialize try_fmt */
        try_fmt->width = supported_modes[0].width;
@@ -937,6 +967,13 @@ static int imx258_open(struct v4l2_subde
        try_fmt->code = imx258_get_format_code(imx258);
        try_fmt->field = V4L2_FIELD_NONE;
 
+       /* Initialize try_crop */
+       try_crop = v4l2_subdev_get_try_crop(sd, fh->state, 0);
+       try_crop->left = IMX258_PIXEL_ARRAY_LEFT;
+       try_crop->top = IMX258_PIXEL_ARRAY_TOP;
+       try_crop->width = IMX258_PIXEL_ARRAY_WIDTH;
+       try_crop->height = IMX258_PIXEL_ARRAY_HEIGHT;
+
        return 0;
 }
 
@@ -1193,6 +1230,58 @@ static int imx258_set_pad_format(struct
        return 0;
 }
 
+static const struct v4l2_rect *
+__imx258_get_pad_crop(struct imx258 *imx258,
+                     struct v4l2_subdev_state *sd_state,
+                     unsigned int pad, enum v4l2_subdev_format_whence which)
+{
+       switch (which) {
+       case V4L2_SUBDEV_FORMAT_TRY:
+               return v4l2_subdev_get_try_crop(&imx258->sd, sd_state, pad);
+       case V4L2_SUBDEV_FORMAT_ACTIVE:
+               return &imx258->cur_mode->crop;
+       }
+
+       return NULL;
+}
+
+static int imx258_get_selection(struct v4l2_subdev *sd,
+                               struct v4l2_subdev_state *sd_state,
+                               struct v4l2_subdev_selection *sel)
+{
+       switch (sel->target) {
+       case V4L2_SEL_TGT_CROP: {
+               struct imx258 *imx258 = to_imx258(sd);
+
+               mutex_lock(&imx258->mutex);
+               sel->r = *__imx258_get_pad_crop(imx258, sd_state, sel->pad,
+                                               sel->which);
+               mutex_unlock(&imx258->mutex);
+
+               return 0;
+       }
+
+       case V4L2_SEL_TGT_NATIVE_SIZE:
+               sel->r.left = 0;
+               sel->r.top = 0;
+               sel->r.width = IMX258_NATIVE_WIDTH;
+               sel->r.height = IMX258_NATIVE_HEIGHT;
+
+               return 0;
+
+       case V4L2_SEL_TGT_CROP_DEFAULT:
+       case V4L2_SEL_TGT_CROP_BOUNDS:
+               sel->r.left = IMX258_PIXEL_ARRAY_LEFT;
+               sel->r.top = IMX258_PIXEL_ARRAY_TOP;
+               sel->r.width = IMX258_PIXEL_ARRAY_WIDTH;
+               sel->r.height = IMX258_PIXEL_ARRAY_HEIGHT;
+
+               return 0;
+       }
+
+       return -EINVAL;
+}
+
 /* Start streaming */
 static int imx258_start_streaming(struct imx258 *imx258)
 {
@@ -1389,6 +1478,7 @@ static const struct v4l2_subdev_pad_ops
        .get_fmt = imx258_get_pad_format,
        .set_fmt = imx258_set_pad_format,
        .enum_frame_size = imx258_enum_frame_size,
+       .get_selection = imx258_get_selection,
 };
 
 static const struct v4l2_subdev_ops imx258_subdev_ops = {