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video/gc0308: implement V4L2 horizontal flip control

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Implement get_supported_value, get_value and set_value callbacks
for IMGSENSOR_ID_HFLIP_VIDEO / IMGSENSOR_ID_HFLIP_STILL.  This
allows applications to mirror the camera preview horizontally at
runtime via VIDIOC_S_CTRL + V4L2_CID_HFLIP.

The hardware mirror is controlled by register 0x14 (CISCTL_MODE1)
bit[0], which reverses the pixel readout order with zero CPU cost.

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
This commit is contained in:
wangjianyu3
2026-04-07 11:21:11 +08:00
committed by simbit18
parent e6ad9d25d7
commit bebfaf8bb4
1 changed files with 51 additions and 5 deletions
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drivers/video/gc0308.c
+51 -5
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@@ -134,9 +134,9 @@
#define GC0308_NATIVE_WIDTH 640 #define GC0308_NATIVE_WIDTH 640
#define GC0308_NATIVE_HEIGHT 480 #define GC0308_NATIVE_HEIGHT 480
/* Mirror/flip */ /* Mirror/flip: register 0x14 (CISCTL_MODE1) bit[0] = horizontal mirror */
#define GC0308_REG_CISCTL_MODE1_MIRROR 0x14 #define GC0308_REG_CISCTL_MODE1_HMIRROR_BIT (1 << 0)
/**************************************************************************** /****************************************************************************
* Private Types * Private Types
@@ -839,7 +839,20 @@ static int gc0308_get_supported_value(struct imgsensor_s *sensor,
uint32_t id, uint32_t id,
imgsensor_supported_value_t *value) imgsensor_supported_value_t *value)
{ {
return -ENOTTY; switch (id)
{
case IMGSENSOR_ID_HFLIP_VIDEO:
case IMGSENSOR_ID_HFLIP_STILL:
value->type = IMGSENSOR_CTRL_TYPE_BOOLEAN;
value->u.range.minimum = 0;
value->u.range.maximum = 1;
value->u.range.step = 1;
value->u.range.default_value = 0;
return OK;
default:
return -ENOTTY;
}
} }
/**************************************************************************** /****************************************************************************
@@ -850,7 +863,27 @@ static int gc0308_get_value(struct imgsensor_s *sensor,
uint32_t id, uint32_t size, uint32_t id, uint32_t size,
imgsensor_value_t *value) imgsensor_value_t *value)
{ {
return -ENOTTY; struct gc0308_dev_s *priv = (struct gc0308_dev_s *)sensor;
uint8_t regval;
int ret;
switch (id)
{
case IMGSENSOR_ID_HFLIP_VIDEO:
case IMGSENSOR_ID_HFLIP_STILL:
ret = gc0308_getreg(priv->i2c, GC0308_REG_CISCTL_MODE1, &regval);
if (ret < 0)
{
return ret;
}
value->value32 =
(regval & GC0308_REG_CISCTL_MODE1_HMIRROR_BIT) ? 1 : 0;
return OK;
default:
return -ENOTTY;
}
} }
/**************************************************************************** /****************************************************************************
@@ -861,7 +894,20 @@ static int gc0308_set_value(struct imgsensor_s *sensor,
uint32_t id, uint32_t size, uint32_t id, uint32_t size,
imgsensor_value_t value) imgsensor_value_t value)
{ {
return -ENOTTY; struct gc0308_dev_s *priv = (struct gc0308_dev_s *)sensor;
switch (id)
{
case IMGSENSOR_ID_HFLIP_VIDEO:
case IMGSENSOR_ID_HFLIP_STILL:
return gc0308_modreg(priv->i2c, GC0308_REG_CISCTL_MODE1,
GC0308_REG_CISCTL_MODE1_HMIRROR_BIT,
value.value32 ?
GC0308_REG_CISCTL_MODE1_HMIRROR_BIT : 0);
default:
return -ENOTTY;
}
} }
/**************************************************************************** /****************************************************************************