media: imx219: Advertise embedded data node on media pad 1

This commit updates the imx219 driver to adverise support for embedded
data streams.  This can then be used by the bcm2835-unicam driver, which
has recently been updated to expose the embedded data stream to
userland.

The imx219 sensor subdevice overloads the media pad to differentiate
between image stream (pad 0) and embedded data stream (pad 1) when
performing the v4l2_subdev_pad_ops functions.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index f3c611a..087716f 100644 (file)
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -161,6 +161,21 @@
 #define IMX219_PIXEL_ARRAY_WIDTH       3280U
 #define IMX219_PIXEL_ARRAY_HEIGHT      2464U
 
+/* Embedded metadata stream structure */
+#define IMX219_EMBEDDED_LINE_WIDTH 16384
+#define IMX219_NUM_EMBEDDED_LINES 1
+
+enum pad_types {
+       IMAGE_PAD,
+       METADATA_PAD,
+       NUM_PADS
+};
+
+struct imx219_reg {
+       u16 address;
+       u8 val;
+};
+
 struct imx219_reg_list {
        unsigned int num_of_regs;
        const struct cci_reg_sequence *regs;
@@ -445,7 +460,7 @@ static const struct imx219_mode supported_modes[] = {
 
 struct imx219 {
        struct v4l2_subdev sd;
-       struct media_pad pad;
+       struct media_pad pad[NUM_PADS];
 
        struct regmap *regmap;
        struct clk *xclk; /* system clock to IMX219 */
@@ -620,6 +635,13 @@ static int imx219_init_cfg(struct v4l2_subdev *sd,
        crop->width = IMX219_PIXEL_ARRAY_WIDTH;
        crop->height = IMX219_PIXEL_ARRAY_HEIGHT;
 
+       /* Initialize try_fmt for the embedded metadata pad */
+       format = v4l2_subdev_get_pad_format(sd, state, 1);
+       format->code = MEDIA_BUS_FMT_SENSOR_DATA;
+       format->width = IMX219_EMBEDDED_LINE_WIDTH;
+       format->height = IMX219_NUM_EMBEDDED_LINES;
+       format->field = V4L2_FIELD_NONE;
+
        return 0;
 }
 
@@ -629,10 +651,20 @@ static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
 {
        struct imx219 *imx219 = to_imx219(sd);
 
-       if (code->index >= (ARRAY_SIZE(imx219_mbus_formats) / 4))
+       if (code->pad >= NUM_PADS)
                return -EINVAL;
 
-       code->code = imx219_get_format_code(imx219, imx219_mbus_formats[code->index * 4]);
+       if (code->pad == IMAGE_PAD) {
+               if (code->index >= (ARRAY_SIZE(imx219_mbus_formats) / 4))
+                       return -EINVAL;
+
+               code->code = imx219_get_format_code(imx219, imx219_mbus_formats[code->index * 4]);
+       } else {
+               if (code->index > 0)
+                       return -EINVAL;
+
+               code->code = MEDIA_BUS_FMT_SENSOR_DATA;
+       }
 
        return 0;
 }
@@ -644,17 +676,30 @@ static int imx219_enum_frame_size(struct v4l2_subdev *sd,
        struct imx219 *imx219 = to_imx219(sd);
        u32 code;
 
-       if (fse->index >= ARRAY_SIZE(supported_modes))
+       if (fse->pad >= NUM_PADS)
                return -EINVAL;
 
-       code = imx219_get_format_code(imx219, fse->code);
-       if (fse->code != code)
-               return -EINVAL;
+       if (fse->pad == IMAGE_PAD) {
+               if (fse->index >= ARRAY_SIZE(supported_modes))
+                       return -EINVAL;
 
-       fse->min_width = supported_modes[fse->index].width;
-       fse->max_width = fse->min_width;
-       fse->min_height = supported_modes[fse->index].height;
-       fse->max_height = fse->min_height;
+               code = imx219_get_format_code(imx219, fse->code);
+               if (fse->code != code)
+                       return -EINVAL;
+
+               fse->min_width = supported_modes[fse->index].width;
+               fse->max_width = fse->min_width;
+               fse->min_height = supported_modes[fse->index].height;
+               fse->max_height = fse->min_height;
+       } else {
+               if (fse->code != MEDIA_BUS_FMT_SENSOR_DATA || fse->index > 0)
+                       return -EINVAL;
+
+               fse->min_width = IMX219_EMBEDDED_LINE_WIDTH;
+               fse->max_width = fse->min_width;
+               fse->min_height = IMX219_NUM_EMBEDDED_LINES;
+               fse->max_height = fse->min_height;
+       }
 
        return 0;
 }
@@ -669,50 +714,59 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
        struct v4l2_mbus_framefmt *format;
        struct v4l2_rect *crop;
 
-       mode = v4l2_find_nearest_size(supported_modes,
-                                     ARRAY_SIZE(supported_modes),
-                                     width, height,
-                                     fmt->format.width, fmt->format.height);
-
-       imx219_update_pad_format(imx219, mode, &fmt->format, fmt->format.code);
-
-       format = v4l2_subdev_get_pad_format(sd, sd_state, 0);
-       crop = v4l2_subdev_get_pad_crop(sd, sd_state, 0);
-
-       *format = fmt->format;
-       *crop = mode->crop;
-
-       if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
-               u32 prev_hts = imx219->mode->width + imx219->hblank->val;
+       if (fmt->pad >= NUM_PADS)
+               return -EINVAL;
 
-               imx219->mode = mode;
-               /* Update limits and set FPS to default */
-               __v4l2_ctrl_modify_range(imx219->vblank, IMX219_VBLANK_MIN,
-                                        IMX219_VTS_MAX - mode->height, 1,
-                                        mode->vts_def - mode->height);
-               __v4l2_ctrl_s_ctrl(imx219->vblank,
-                                  mode->vts_def - mode->height);
-               /* Update max exposure while meeting expected vblanking */
-               exposure_max = mode->vts_def - 4;
-               exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
-                       exposure_max : IMX219_EXPOSURE_DEFAULT;
-               __v4l2_ctrl_modify_range(imx219->exposure,
-                                        imx219->exposure->minimum,
-                                        exposure_max, imx219->exposure->step,
-                                        exposure_def);
-               /*
-                * Retain PPL setting from previous mode so that the
-                * line time does not change on a mode change.
-                * Limits have to be recomputed as the controls define
-                * the blanking only, so PPL values need to have the
-                * mode width subtracted.
-                */
-               hblank = prev_hts - mode->width;
-               __v4l2_ctrl_modify_range(imx219->hblank,
-                                        IMX219_PPL_MIN - mode->width,
-                                        IMX219_PPL_MAX - mode->width,
-                                        1, IMX219_PPL_MIN - mode->width);
-               __v4l2_ctrl_s_ctrl(imx219->hblank, hblank);
+       if (fmt->pad == IMAGE_PAD) {
+               mode = v4l2_find_nearest_size(supported_modes,
+                                             ARRAY_SIZE(supported_modes),
+                                             width, height,
+                                             fmt->format.width, fmt->format.height);
+
+               imx219_update_pad_format(imx219, mode, &fmt->format, fmt->format.code);
+
+               format = v4l2_subdev_get_pad_format(sd, sd_state, 0);
+               crop = v4l2_subdev_get_pad_crop(sd, sd_state, 0);
+               
+               *format = fmt->format;
+               *crop = mode->crop;
+
+               if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+                       u32 prev_hts = imx219->mode->width + imx219->hblank->val;
+
+                       imx219->mode = mode;
+                       /* Update limits and set FPS to default */
+                       __v4l2_ctrl_modify_range(imx219->vblank, IMX219_VBLANK_MIN,
+                                                IMX219_VTS_MAX - mode->height, 1,
+                                                mode->vts_def - mode->height);
+                       __v4l2_ctrl_s_ctrl(imx219->vblank,
+                                          mode->vts_def - mode->height);
+                       /* Update max exposure while meeting expected vblanking */
+                       exposure_max = mode->vts_def - 4;
+                       exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
+                               exposure_max : IMX219_EXPOSURE_DEFAULT;
+                       __v4l2_ctrl_modify_range(imx219->exposure,
+                                                imx219->exposure->minimum,
+                                                exposure_max, imx219->exposure->step,
+                                                exposure_def);
+                       /*
+                        * Retain PPL setting from previous mode so that the
+                        * line time does not change on a mode change.
+                        * Limits have to be recomputed as the controls define
+                        * the blanking only, so PPL values need to have the
+                        * mode width subtracted.
+                        */
+                       hblank = prev_hts - mode->width;
+                       __v4l2_ctrl_modify_range(imx219->hblank,
+                                                IMX219_PPL_MIN - mode->width,
+                                                IMX219_PPL_MAX - mode->width,
+                                                1, IMX219_PPL_MIN - mode->width);
+                       __v4l2_ctrl_s_ctrl(imx219->hblank, hblank);
+               }
+       } else {
+               format = v4l2_subdev_get_pad_format(sd, sd_state, 1);
+               /* Don't allow the embedded data format to be changed */
+               fmt->format = *format;
        }
 
        return 0;
@@ -1331,9 +1385,10 @@ static int imx219_probe(struct i2c_client *client)
        imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 
        /* Initialize source pad */
-       imx219->pad.flags = MEDIA_PAD_FL_SOURCE;
+       imx219->pad[IMAGE_PAD].flags = MEDIA_PAD_FL_SOURCE;
+       imx219->pad[METADATA_PAD].flags = MEDIA_PAD_FL_SOURCE;
 
-       ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
+       ret = media_entity_pads_init(&imx219->sd.entity, NUM_PADS, imx219->pad);
        if (ret) {
                dev_err(dev, "failed to init entity pads: %d\n", ret);
                goto error_handler_free;