This patch adds the ability to get arbitrary resolutions with a width
up to 2592 and a height up to 720 pixels instead of the standard 1280x720
only.
---
diff --git a/drivers/media/video/ov5642.c b/drivers/media/video/ov5642.c
index 6410bda..54c822c 100644
--- a/drivers/media/video/ov5642.c
+++ b/drivers/media/video/ov5642.c
@@ -14,8 +14,10 @@
* published by the Free Software Foundation.
*/
+#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/i2c.h>
+#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
@@ -34,7 +36,7 @@
#define REG_WINDOW_START_Y_LOW 0x3803
#define REG_WINDOW_WIDTH_HIGH 0x3804
#define REG_WINDOW_WIDTH_LOW 0x3805
-#define REG_WINDOW_HEIGHT_HIGH 0x3806
+#define REG_WINDOW_HEIGHT_HIGH 0x3806
#define REG_WINDOW_HEIGHT_LOW 0x3807
#define REG_OUT_WIDTH_HIGH 0x3808
#define REG_OUT_WIDTH_LOW 0x3809
@@ -44,19 +46,44 @@
#define REG_OUT_TOTAL_WIDTH_LOW 0x380d
#define REG_OUT_TOTAL_HEIGHT_HIGH 0x380e
#define REG_OUT_TOTAL_HEIGHT_LOW 0x380f
+#define REG_OUTPUT_FORMAT 0x4300
+#define REG_ISP_CTRL_01 0x5001
+#define REG_AVG_WINDOW_END_X_HIGH 0x5682
+#define REG_AVG_WINDOW_END_X_LOW 0x5683
+#define REG_AVG_WINDOW_END_Y_HIGH 0x5686
+#define REG_AVG_WINDOW_END_Y_LOW 0x5687
+
+/* active pixel array size */
+#define OV5642_SENSOR_SIZE_X 2592
+#define OV5642_SENSOR_SIZE_Y 1944
/*
- * define standard resolution.
- * Works currently only for up to 720 lines
- * eg. 320x240, 640x480, 800x600, 1280x720, 2048x720
+ * About OV5642 resolution, cropping and binning:
+ * This sensor supports it all, at least in the feature description.
+ * Unfortunately, no combination of appropriate registers settings could make
+ * the chip work the intended way. As it works with predefined register lists,
+ * some undocumented registers are presumably changed there to achieve their
+ * goals.
+ * This driver currently only works for resolutions up to 720 lines with a
+ * 1:1 scale. Hopefully these restrictions will be removed in the future.
*/
+#define OV5642_MAX_WIDTH OV5642_SENSOR_SIZE_X
+#define OV5642_MAX_HEIGHT 720
-#define OV5642_WIDTH 1280
-#define OV5642_HEIGHT 720
-#define OV5642_TOTAL_WIDTH 3200
-#define OV5642_TOTAL_HEIGHT 2000
-#define OV5642_SENSOR_SIZE_X 2592
-#define OV5642_SENSOR_SIZE_Y 1944
+/* default sizes */
+#define OV5642_DEFAULT_WIDTH 1280
+#define OV5642_DEFAULT_HEIGHT OV5642_MAX_HEIGHT
+
+/* minimum extra blanking */
+#define BLANKING_EXTRA_WIDTH 500
+#define BLANKING_EXTRA_HEIGHT 20
+
+/*
+ * the sensor's autoexposure is buggy when setting total_height low.
+ * It tries to expose longer than 1 frame period without taking care of it
+ * and this leads to weird output. So we set 1000 lines as minimum.
+ */
+#define BLANKING_MIN_HEIGHT 1000
struct regval_list {
u16 reg_num;
@@ -581,6 +608,11 @@ struct ov5642_datafmt {
struct ov5642 {
struct v4l2_subdev subdev;
const struct ov5642_datafmt *fmt;
+ struct v4l2_rect crop_rect;
+
+ /* blanking information */
+ int total_width;
+ int total_height;
};
static const struct ov5642_datafmt ov5642_colour_fmts[] = {
@@ -641,6 +673,21 @@ static int reg_write(struct i2c_client *client, u16 reg, u8 val)
return 0;
}
+
+/*
+ * convenience function to write 16 bit register values that are split up
+ * into two consecutive high and low parts
+ */
+static int reg_write16(struct i2c_client *client, u16 reg, u16 val16)
+{
+ int ret;
+
+ ret = reg_write(client, reg, val16 >> 8);
+ if (ret)
+ return ret;
+ return reg_write(client, reg + 1, val16 & 0x00ff);
+}
+
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov5642_get_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
@@ -684,107 +731,101 @@ static int ov5642_write_array(struct i2c_client *client,
return 0;
}
-static int ov5642_set_resolution(struct i2c_client *client)
+static int ov5642_set_resolution(struct v4l2_subdev *sd)
{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ov5642 *priv = to_ov5642(client);
+ int width = priv->crop_rect.width;
+ int height = priv->crop_rect.height;
+ int total_width = priv->total_width;
+ int total_height = priv->total_height;
+ int start_x = (OV5642_SENSOR_SIZE_X - width) / 2;
+ int start_y = (OV5642_SENSOR_SIZE_Y - height) / 2;
int ret;
- u8 start_x_high = ((OV5642_SENSOR_SIZE_X - OV5642_WIDTH) / 2) >> 8;
- u8 start_x_low = ((OV5642_SENSOR_SIZE_X - OV5642_WIDTH) / 2) & 0xff;
- u8 start_y_high = ((OV5642_SENSOR_SIZE_Y - OV5642_HEIGHT) / 2) >> 8;
- u8 start_y_low = ((OV5642_SENSOR_SIZE_Y - OV5642_HEIGHT) / 2) & 0xff;
-
- u8 width_high = OV5642_WIDTH >> 8;
- u8 width_low = OV5642_WIDTH & 0xff;
- u8 height_high = OV5642_HEIGHT >> 8;
- u8 height_low = OV5642_HEIGHT & 0xff;
-
- u8 total_width_high = OV5642_TOTAL_WIDTH >> 8;
- u8 total_width_low = OV5642_TOTAL_WIDTH & 0xff;
- u8 total_height_high = OV5642_TOTAL_HEIGHT >> 8;
- u8 total_height_low = OV5642_TOTAL_HEIGHT & 0xff;
-
- ret = reg_write(client, REG_WINDOW_START_X_HIGH, start_x_high);
- if (!ret)
- ret = reg_write(client, REG_WINDOW_START_X_LOW, start_x_low);
- if (!ret)
- ret = reg_write(client, REG_WINDOW_START_Y_HIGH, start_y_high);
- if (!ret)
- ret = reg_write(client, REG_WINDOW_START_Y_LOW, start_y_low);
+ /*
+ * This should set the starting point for cropping.
+ * Doesn't work so far.
+ */
+ ret = reg_write16(client, REG_WINDOW_START_X_HIGH, start_x);
if (!ret)
- ret = reg_write(client, REG_WINDOW_WIDTH_HIGH, width_high);
- if (!ret)
- ret = reg_write(client, REG_WINDOW_WIDTH_LOW , width_low);
- if (!ret)
- ret = reg_write(client, REG_WINDOW_HEIGHT_HIGH, height_high);
- if (!ret)
- ret = reg_write(client, REG_WINDOW_HEIGHT_LOW, height_low);
+ ret = reg_write16(client, REG_WINDOW_START_Y_HIGH, start_y);
+ if (!ret) {
+ priv->crop_rect.left = start_x;
+ priv->crop_rect.top = start_y;
+ }
if (!ret)
- ret = reg_write(client, REG_OUT_WIDTH_HIGH, width_high);
+ ret = reg_write16(client, REG_WINDOW_WIDTH_HIGH, width);
if (!ret)
- ret = reg_write(client, REG_OUT_WIDTH_LOW , width_low);
- if (!ret)
- ret = reg_write(client, REG_OUT_HEIGHT_HIGH, height_high);
+ ret = reg_write16(client, REG_WINDOW_HEIGHT_HIGH, height);
+ if (ret)
+ return ret;
+ priv->crop_rect.width = width;
+ priv->crop_rect.height = height;
+
+ /* Set the output window size. Only 1:1 scale is supported so far. */
+ ret = reg_write16(client, REG_OUT_WIDTH_HIGH, width);
if (!ret)
- ret = reg_write(client, REG_OUT_HEIGHT_LOW, height_low);
+ ret = reg_write16(client, REG_OUT_HEIGHT_HIGH, height);
+ /* Total width = output size + blanking */
if (!ret)
- ret = reg_write(client, REG_OUT_TOTAL_WIDTH_HIGH, total_width_high);
+ ret = reg_write16(client, REG_OUT_TOTAL_WIDTH_HIGH, total_width);
if (!ret)
- ret = reg_write(client, REG_OUT_TOTAL_WIDTH_LOW, total_width_low);
+ ret = reg_write16(client, REG_OUT_TOTAL_HEIGHT_HIGH, total_height);
+
+ /* Sets the window for AWB calculations */
if (!ret)
- ret = reg_write(client, REG_OUT_TOTAL_HEIGHT_HIGH, total_height_high);
+ ret = reg_write16(client, REG_AVG_WINDOW_END_X_HIGH, width);
if (!ret)
- ret = reg_write(client, REG_OUT_TOTAL_HEIGHT_LOW, total_height_low);
+ ret = reg_write16(client, REG_AVG_WINDOW_END_Y_HIGH, height);
return ret;
}
-static int ov5642_try_fmt(struct v4l2_subdev *sd,
- struct v4l2_mbus_framefmt *mf)
+static int ov5642_try_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf)
{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ov5642 *priv = to_ov5642(client);
const struct ov5642_datafmt *fmt = ov5642_find_datafmt(mf->code);
- dev_dbg(sd->v4l2_dev->dev, "%s(%u) width: %u heigth: %u\n",
- __func__, mf->code, mf->width, mf->height);
+ mf->width = priv->crop_rect.width;
+ mf->height = priv->crop_rect.height;
if (!fmt) {
mf->code = ov5642_colour_fmts[0].code;
mf->colorspace = ov5642_colour_fmts[0].colorspace;
}
- mf->width = OV5642_WIDTH;
- mf->height = OV5642_HEIGHT;
mf->field = V4L2_FIELD_NONE;
return 0;
}
-static int ov5642_s_fmt(struct v4l2_subdev *sd,
- struct v4l2_mbus_framefmt *mf)
+static int ov5642_s_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
-
- dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
+ int ret;
/* MIPI CSI could have changed the format, double-check */
if (!ov5642_find_datafmt(mf->code))
return -EINVAL;
ov5642_try_fmt(sd, mf);
-
priv->fmt = ov5642_find_datafmt(mf->code);
- ov5642_write_array(client, ov5642_default_regs_init);
- ov5642_set_resolution(client);
- ov5642_write_array(client, ov5642_default_regs_finalise);
+ ret = ov5642_write_array(client, ov5642_default_regs_init);
+ if (!ret)
+ ret = ov5642_set_resolution(sd);
+ if (!ret)
+ ret = ov5642_write_array(client, ov5642_default_regs_finalise);
- return 0;
+ return ret;
}
-static int ov5642_g_fmt(struct v4l2_subdev *sd,
- struct v4l2_mbus_framefmt *mf)
+static int ov5642_g_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
@@ -793,8 +834,8 @@ static int ov5642_g_fmt(struct v4l2_subdev *sd,
mf->code = fmt->code;
mf->colorspace = fmt->colorspace;
- mf->width = OV5642_WIDTH;
- mf->height = OV5642_HEIGHT;
+ mf->width = priv->crop_rect.width;
+ mf->height = priv->crop_rect.height;
mf->field = V4L2_FIELD_NONE;
return 0;
@@ -827,15 +868,44 @@ static int ov5642_g_chip_ident(struct v4l2_subdev *sd,
return 0;
}
+static int ov5642_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ov5642 *priv = to_ov5642(client);
+ struct v4l2_rect *rect = &a->c;
+ int ret;
+
+ v4l_bound_align_image(&rect->width, 48, OV5642_MAX_WIDTH, 1,
+ &rect->height, 32, OV5642_MAX_HEIGHT, 1, 0);
+
+ priv->crop_rect.width = rect->width;
+ priv->crop_rect.height = rect->height;
+ priv->total_width = rect->width + BLANKING_EXTRA_WIDTH;
+ priv->total_height = max_t(int, rect->height +
+ BLANKING_EXTRA_HEIGHT,
+ BLANKING_MIN_HEIGHT);
+ priv->crop_rect.width = rect->width;
+ priv->crop_rect.height = rect->height;
+
+ ret = ov5642_write_array(client, ov5642_default_regs_init);
+ if (!ret)
+ ret = ov5642_set_resolution(sd);
+ if (!ret)
+ ret = ov5642_write_array(client, ov5642_default_regs_finalise);
+
+ return ret;
+}
+
static int ov5642_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ov5642 *priv = to_ov5642(client);
struct v4l2_rect *rect = &a->c;
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
- a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- rect->top = 0;
- rect->left = 0;
- rect->width = OV5642_WIDTH;
- rect->height = OV5642_HEIGHT;
+ *rect = priv->crop_rect;
return 0;
}
@@ -844,8 +914,8 @@ static int ov5642_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
{
a->bounds.left = 0;
a->bounds.top = 0;
- a->bounds.width = OV5642_WIDTH;
- a->bounds.height = OV5642_HEIGHT;
+ a->bounds.width = OV5642_MAX_WIDTH;
+ a->bounds.height = OV5642_MAX_HEIGHT;
a->defrect = a->bounds;
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
a->pixelaspect.numerator = 1;
@@ -858,9 +928,8 @@ static int ov5642_g_mbus_config(struct v4l2_subdev *sd,
struct v4l2_mbus_config *cfg)
{
cfg->type = V4L2_MBUS_CSI2;
- cfg->flags = V4L2_MBUS_CSI2_2_LANE |
- V4L2_MBUS_CSI2_CHANNEL_0 |
- V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
+ cfg->flags = V4L2_MBUS_CSI2_2_LANE | V4L2_MBUS_CSI2_CHANNEL_0 |
+ V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
return 0;
}
@@ -870,6 +939,7 @@ static struct v4l2_subdev_video_ops ov5642_subdev_video_ops = {
.g_mbus_fmt = ov5642_g_fmt,
.try_mbus_fmt = ov5642_try_fmt,
.enum_mbus_fmt = ov5642_enum_fmt,
+ .s_crop = ov5642_s_crop,
.g_crop = ov5642_g_crop,
.cropcap = ov5642_cropcap,
.g_mbus_config = ov5642_g_mbus_config,
@@ -941,8 +1011,17 @@ static int ov5642_probe(struct i2c_client *client,
v4l2_i2c_subdev_init(&priv->subdev, client, &ov5642_subdev_ops);
- icd->ops = NULL;
- priv->fmt = &ov5642_colour_fmts[0];
+ icd->ops = NULL;
+ priv->fmt = &ov5642_colour_fmts[0];
+
+ priv->crop_rect.width = OV5642_DEFAULT_WIDTH;
+ priv->crop_rect.height = OV5642_DEFAULT_HEIGHT;
+ priv->crop_rect.left = (OV5642_MAX_WIDTH - OV5642_DEFAULT_WIDTH) / 2;
+ priv->crop_rect.top = (OV5642_MAX_HEIGHT - OV5642_DEFAULT_HEIGHT) / 2;
+ priv->crop_rect.width = OV5642_DEFAULT_WIDTH;
+ priv->crop_rect.height = OV5642_DEFAULT_HEIGHT;
+ priv->total_width = OV5642_DEFAULT_WIDTH + BLANKING_EXTRA_WIDTH;
+ priv->total_height = BLANKING_MIN_HEIGHT;
ret = ov5642_video_probe(icd, client);
if (ret < 0)
@@ -951,6 +1030,7 @@ static int ov5642_probe(struct i2c_client *client,
return 0;
error:
+ icd->ops = NULL;
kfree(priv);
return ret;
}
@@ -961,6 +1041,7 @@ static int ov5642_remove(struct i2c_client *client)
struct soc_camera_device *icd = client->dev.platform_data;
struct soc_camera_link *icl = to_soc_camera_link(icd);
+ icd->ops = NULL;
if (icl->free_bus)
icl->free_bus(icl);
kfree(priv);
--
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