#define MT9T031_MAX_HEIGHT 1536
#define MT9T031_MAX_WIDTH 2048
#define MT9T031_MIN_HEIGHT 2
-#define MT9T031_MIN_WIDTH 2
+#define MT9T031_MIN_WIDTH 18
#define MT9T031_HORIZONTAL_BLANK 142
#define MT9T031_VERTICAL_BLANK 25
#define MT9T031_COLUMN_SKIP 32
struct mt9t031 {
struct v4l2_subdev subdev;
+ struct v4l2_rect rect; /* Sensor window */
int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
- unsigned char autoexposure;
u16 xskip;
u16 yskip;
+ unsigned char autoexposure;
};
static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
}
-/* Round up minima and round down maxima */
-static void recalculate_limits(struct soc_camera_device *icd,
- u16 xskip, u16 yskip)
+/* target must be _even_ */
+static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
{
- icd->rect_max.left = (MT9T031_COLUMN_SKIP + xskip - 1) / xskip;
- icd->rect_max.top = (MT9T031_ROW_SKIP + yskip - 1) / yskip;
- icd->width_min = (MT9T031_MIN_WIDTH + xskip - 1) / xskip;
- icd->height_min = (MT9T031_MIN_HEIGHT + yskip - 1) / yskip;
- icd->rect_max.width = MT9T031_MAX_WIDTH / xskip;
- icd->rect_max.height = MT9T031_MAX_HEIGHT / yskip;
+ unsigned int skip;
+
+ if (*source < target + target / 2) {
+ *source = target;
+ return 1;
+ }
+
+ skip = min(max, *source + target / 2) / target;
+ if (skip > 8)
+ skip = 8;
+ *source = target * skip;
+
+ return skip;
}
+/* rect is the sensor rectangle, the caller guarantees parameter validity */
static int mt9t031_set_params(struct soc_camera_device *icd,
struct v4l2_rect *rect, u16 xskip, u16 yskip)
{
struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
struct mt9t031 *mt9t031 = to_mt9t031(client);
int ret;
- u16 xbin, ybin, width, height, left, top;
+ u16 xbin, ybin;
const u16 hblank = MT9T031_HORIZONTAL_BLANK,
vblank = MT9T031_VERTICAL_BLANK;
- width = rect->width * xskip;
- height = rect->height * yskip;
- left = rect->left * xskip;
- top = rect->top * yskip;
-
xbin = min(xskip, (u16)3);
ybin = min(yskip, (u16)3);
- dev_dbg(&client->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
- xskip, width, rect->width, yskip, height, rect->height);
-
- /* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
+ /*
+ * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
+ * There is always a valid suitably aligned value. The worst case is
+ * xbin = 3, width = 2048. Then we will start at 36, the last read out
+ * pixel will be 2083, which is < 2085 - first black pixel.
+ *
+ * MT9T031 datasheet imposes window left border alignment, depending on
+ * the selected xskip. Failing to conform to this requirement produces
+ * dark horizontal stripes in the image. However, even obeying to this
+ * requirement doesn't eliminate the stripes in all configurations. They
+ * appear "locally reproducibly," but can differ between tests under
+ * different lighting conditions.
+ */
switch (xbin) {
- case 2:
- left = (left + 3) & ~3;
+ case 1:
+ rect->left &= ~1;
break;
- case 3:
- left = roundup(left, 6);
- }
-
- switch (ybin) {
case 2:
- top = (top + 3) & ~3;
+ rect->left &= ~3;
break;
case 3:
- top = roundup(top, 6);
+ rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
+ (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
}
+ rect->top &= ~1;
+
+ dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
+ xskip, yskip, rect->width, rect->height, rect->left, rect->top);
+
/* Disable register update, reconfigure atomically */
ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
if (ret < 0)
ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
((ybin - 1) << 4) | (yskip - 1));
}
- dev_dbg(&client->dev, "new physical left %u, top %u\n", left, top);
+ dev_dbg(&client->dev, "new physical left %u, top %u\n",
+ rect->left, rect->top);
/* The caller provides a supported format, as guaranteed by
* icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
if (ret >= 0)
- ret = reg_write(client, MT9T031_COLUMN_START, left);
+ ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
if (ret >= 0)
- ret = reg_write(client, MT9T031_ROW_START, top);
+ ret = reg_write(client, MT9T031_ROW_START, rect->top);
if (ret >= 0)
- ret = reg_write(client, MT9T031_WINDOW_WIDTH, width - 1);
+ ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
if (ret >= 0)
ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
- height + icd->y_skip_top - 1);
+ rect->height + icd->y_skip_top - 1);
if (ret >= 0 && mt9t031->autoexposure) {
- ret = set_shutter(client, height + icd->y_skip_top + vblank);
+ ret = set_shutter(client,
+ rect->height + icd->y_skip_top + vblank);
if (ret >= 0) {
const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
const struct v4l2_queryctrl *qctrl =
soc_camera_find_qctrl(icd->ops,
V4L2_CID_EXPOSURE);
- icd->exposure = (shutter_max / 2 + (height +
+ icd->exposure = (shutter_max / 2 + (rect->height +
icd->y_skip_top + vblank - 1) *
(qctrl->maximum - qctrl->minimum)) /
shutter_max + qctrl->minimum;
if (ret >= 0)
ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
+ if (ret >= 0) {
+ mt9t031->rect = *rect;
+ mt9t031->xskip = xskip;
+ mt9t031->yskip = yskip;
+ }
+
return ret < 0 ? ret : 0;
}
static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
- struct v4l2_rect *rect = &a->c;
+ struct v4l2_rect rect = a->c;
struct i2c_client *client = sd->priv;
struct mt9t031 *mt9t031 = to_mt9t031(client);
struct soc_camera_device *icd = client->dev.platform_data;
- /* Make sure we don't exceed sensor limits */
- if (rect->left + rect->width > icd->rect_max.left + icd->rect_max.width)
- rect->left = icd->rect_max.width + icd->rect_max.left -
- rect->width;
+ rect.width = ALIGN(rect.width, 2);
+ rect.height = ALIGN(rect.height, 2);
+
+ soc_camera_limit_side(&rect.left, &rect.width,
+ MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
+
+ soc_camera_limit_side(&rect.top, &rect.height,
+ MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
+
+ return mt9t031_set_params(icd, &rect, mt9t031->xskip, mt9t031->yskip);
+}
+
+static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
+{
+ struct i2c_client *client = sd->priv;
+ struct mt9t031 *mt9t031 = to_mt9t031(client);
+
+ a->c = mt9t031->rect;
+ a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (rect->top + rect->height > icd->rect_max.height + icd->rect_max.top)
- rect->top = icd->rect_max.height + icd->rect_max.top -
- rect->height;
+ return 0;
+}
+
+static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
+{
+ a->bounds.left = MT9T031_COLUMN_SKIP;
+ a->bounds.top = MT9T031_ROW_SKIP;
+ a->bounds.width = MT9T031_MAX_WIDTH;
+ a->bounds.height = MT9T031_MAX_HEIGHT;
+ a->defrect = a->bounds;
+ a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ a->pixelaspect.numerator = 1;
+ a->pixelaspect.denominator = 1;
- /* CROP - no change in scaling, or in limits */
- return mt9t031_set_params(icd, rect, mt9t031->xskip, mt9t031->yskip);
+ return 0;
+}
+
+static int mt9t031_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
+{
+ struct i2c_client *client = sd->priv;
+ struct mt9t031 *mt9t031 = to_mt9t031(client);
+ struct v4l2_pix_format *pix = &f->fmt.pix;
+
+ pix->width = mt9t031->rect.width / mt9t031->xskip;
+ pix->height = mt9t031->rect.height / mt9t031->yskip;
+ pix->pixelformat = V4L2_PIX_FMT_SGRBG10;
+ pix->field = V4L2_FIELD_NONE;
+ pix->colorspace = V4L2_COLORSPACE_SRGB;
+
+ return 0;
}
static int mt9t031_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
struct i2c_client *client = sd->priv;
struct mt9t031 *mt9t031 = to_mt9t031(client);
struct soc_camera_device *icd = client->dev.platform_data;
- int ret;
+ struct v4l2_pix_format *pix = &f->fmt.pix;
u16 xskip, yskip;
- struct v4l2_rect rect = {
- .left = icd->rect_current.left,
- .top = icd->rect_current.top,
- .width = f->fmt.pix.width,
- .height = f->fmt.pix.height,
- };
+ struct v4l2_rect rect = mt9t031->rect;
/*
- * try_fmt has put rectangle within limits.
- * S_FMT - use binning and skipping for scaling, recalculate
- * limits, used for cropping
+ * try_fmt has put width and height within limits.
+ * S_FMT: use binning and skipping for scaling
*/
- /* Is this more optimal than just a division? */
- for (xskip = 8; xskip > 1; xskip--)
- if (rect.width * xskip <= MT9T031_MAX_WIDTH)
- break;
-
- for (yskip = 8; yskip > 1; yskip--)
- if (rect.height * yskip <= MT9T031_MAX_HEIGHT)
- break;
-
- recalculate_limits(icd, xskip, yskip);
-
- ret = mt9t031_set_params(icd, &rect, xskip, yskip);
- if (!ret) {
- mt9t031->xskip = xskip;
- mt9t031->yskip = yskip;
- }
+ xskip = mt9t031_skip(&rect.width, pix->width, MT9T031_MAX_WIDTH);
+ yskip = mt9t031_skip(&rect.height, pix->height, MT9T031_MAX_HEIGHT);
- return ret;
+ /* mt9t031_set_params() doesn't change width and height */
+ return mt9t031_set_params(icd, &rect, xskip, yskip);
}
+/*
+ * If a user window larger than sensor window is requested, we'll increase the
+ * sensor window.
+ */
static int mt9t031_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
{
struct v4l2_pix_format *pix = &f->fmt.pix;
if (ctrl->value) {
const u16 vblank = MT9T031_VERTICAL_BLANK;
const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
- if (set_shutter(client, icd->rect_current.height +
+ if (set_shutter(client, mt9t031->rect.height +
icd->y_skip_top + vblank) < 0)
return -EIO;
qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
icd->exposure = (shutter_max / 2 +
- (icd->rect_current.height +
+ (mt9t031->rect.height +
icd->y_skip_top + vblank - 1) *
(qctrl->maximum - qctrl->minimum)) /
shutter_max + qctrl->minimum;
struct mt9t031 *mt9t031 = to_mt9t031(client);
s32 data;
- /* We must have a parent by now. And it cannot be a wrong one.
- * So this entire test is completely redundant. */
- if (!icd->dev.parent ||
- to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
- return -ENODEV;
-
/* Enable the chip */
data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
dev_dbg(&client->dev, "write: %d\n", data);
static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
.s_stream = mt9t031_s_stream,
.s_fmt = mt9t031_s_fmt,
+ .g_fmt = mt9t031_g_fmt,
.try_fmt = mt9t031_try_fmt,
.s_crop = mt9t031_s_crop,
+ .g_crop = mt9t031_g_crop,
+ .cropcap = mt9t031_cropcap,
};
static struct v4l2_subdev_ops mt9t031_subdev_ops = {
/* Second stage probe - when a capture adapter is there */
icd->ops = &mt9t031_ops;
- icd->rect_max.left = MT9T031_COLUMN_SKIP;
- icd->rect_max.top = MT9T031_ROW_SKIP;
- icd->rect_current.left = icd->rect_max.left;
- icd->rect_current.top = icd->rect_max.top;
- icd->width_min = MT9T031_MIN_WIDTH;
- icd->rect_max.width = MT9T031_MAX_WIDTH;
- icd->height_min = MT9T031_MIN_HEIGHT;
- icd->rect_max.height = MT9T031_MAX_HEIGHT;
icd->y_skip_top = 0;
+
+ mt9t031->rect.left = MT9T031_COLUMN_SKIP;
+ mt9t031->rect.top = MT9T031_ROW_SKIP;
+ mt9t031->rect.width = MT9T031_MAX_WIDTH;
+ mt9t031->rect.height = MT9T031_MAX_HEIGHT;
+
/* Simulated autoexposure. If enabled, we calculate shutter width
* ourselves in the driver based on vertical blanking and frame width */
mt9t031->autoexposure = 1;
projects / mv-sheeva.git / blobdiff