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Subject[PATCH v4 2/3] media: ov7670: Add the get_fmt callback
Date
Add the get_fmt callback, also enable V4L2_SUBDEV_FL_HAS_DEVNODE flag
to make this subdev has device node.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
---

Changes in v4:
- Fix the build error when not enabling V4L2 sub-device userspace API option.

Changes in v3:
- Keep tried format info in the try_fmt member of
v4l2_subdev__pad_config struct.
- Add the internal_ops callback to set default format.

Changes in v2: None

drivers/media/i2c/ov7670.c | 75 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 74 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index 553945d4ca28..456f48057605 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/drivers/media/i2c/ov7670.c
@@ -232,6 +232,7 @@ struct ov7670_info {
struct v4l2_ctrl *saturation;
struct v4l2_ctrl *hue;
};
+ struct v4l2_mbus_framefmt format;
struct ov7670_format_struct *fmt; /* Current format */
struct clk *clk;
struct gpio_desc *resetb_gpio;
@@ -975,6 +976,9 @@ static int ov7670_try_fmt_internal(struct v4l2_subdev *sd,
fmt->width = wsize->width;
fmt->height = wsize->height;
fmt->colorspace = ov7670_formats[index].colorspace;
+
+ info->format = *fmt;
+
return 0;
}

@@ -998,8 +1002,15 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL);
if (ret)
return ret;
- cfg->try_fmt = format->format;
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+ struct v4l2_mbus_framefmt *mbus_fmt;
+
+ mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
+ *mbus_fmt = format->format;
return 0;
+#else
+ return -ENOTTY;
+#endif
}

ret = ov7670_try_fmt_internal(sd, &format->format, &ovfmt, &wsize);
@@ -1041,6 +1052,29 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
return 0;
}

+static int ov7670_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct ov7670_info *info = to_state(sd);
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+ struct v4l2_mbus_framefmt *mbus_fmt;
+
+ mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
+ format->format = *mbus_fmt;
+ return 0;
+#else
+ return -ENOTTY;
+#endif
+ } else {
+ format->format = info->format;
+ }
+
+ return 0;
+}
+
/*
* Implement G/S_PARM. There is a "high quality" mode we could try
* to do someday; for now, we just do the frame rate tweak.
@@ -1508,6 +1542,30 @@ static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_regis
}
#endif

+static void ov7670_get_default_format(struct v4l2_subdev *sd,
+ struct v4l2_mbus_framefmt *format)
+{
+ struct ov7670_info *info = to_state(sd);
+
+ format->width = info->devtype->win_sizes[0].width;
+ format->height = info->devtype->win_sizes[0].height;
+ format->colorspace = info->fmt->colorspace;
+ format->code = info->fmt->mbus_code;
+ format->field = V4L2_FIELD_NONE;
+}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static int ov7670_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ struct v4l2_mbus_framefmt *format =
+ v4l2_subdev_get_try_format(sd, fh->pad, 0);
+
+ ov7670_get_default_format(sd, format);
+
+ return 0;
+}
+#endif
+
/* ----------------------------------------------------------------------- */

static const struct v4l2_subdev_core_ops ov7670_core_ops = {
@@ -1528,6 +1586,7 @@ static const struct v4l2_subdev_pad_ops ov7670_pad_ops = {
.enum_frame_interval = ov7670_enum_frame_interval,
.enum_frame_size = ov7670_enum_frame_size,
.enum_mbus_code = ov7670_enum_mbus_code,
+ .get_fmt = ov7670_get_fmt,
.set_fmt = ov7670_set_fmt,
};

@@ -1537,6 +1596,12 @@ static const struct v4l2_subdev_ops ov7670_ops = {
.pad = &ov7670_pad_ops,
};

+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static const struct v4l2_subdev_internal_ops ov7670_subdev_internal_ops = {
+ .open = ov7670_open,
+};
+#endif
+
/* ----------------------------------------------------------------------- */

static const struct ov7670_devtype ov7670_devdata[] = {
@@ -1589,6 +1654,11 @@ static int ov7670_probe(struct i2c_client *client,
sd = &info->sd;
v4l2_i2c_subdev_init(sd, client, &ov7670_ops);

+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+ sd->internal_ops = &ov7670_subdev_internal_ops;
+ sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+
info->clock_speed = 30; /* default: a guess */
if (client->dev.platform_data) {
struct ov7670_config *config = client->dev.platform_data;
@@ -1645,6 +1715,9 @@ static int ov7670_probe(struct i2c_client *client,

info->devtype = &ov7670_devdata[id->driver_data];
info->fmt = &ov7670_formats[0];
+
+ ov7670_get_default_format(sd, &info->format);
+
info->clkrc = 0;

/* Set default frame rate to 30 fps */
--
2.13.0
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