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media: gspca_zc3xx: Implement proper autogain and exposure control for OV7648

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The ZS0211 internal autogain causes pumping and flickering with OV7648
sensor on 0ac8:307b webcam.
Implement OV7648 autogain and exposure control and use that instead.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Ondrej Zary 2018-05-25 05:08:41 -04:00 committed by Mauro Carvalho Chehab
parent 73a110623e
commit 6f92c3a22c
1 changed files with 34 additions and 8 deletions
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42
drivers/media/usb/gspca/zc3xx.c
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@ -5778,16 +5778,34 @@ static void setcontrast(struct gspca_dev *gspca_dev,
static s32 getexposure(struct gspca_dev *gspca_dev)
{
return (i2c_read(gspca_dev, 0x25) << 9)
| (i2c_read(gspca_dev, 0x26) << 1)
| (i2c_read(gspca_dev, 0x27) >> 7);
struct sd *sd = (struct sd *) gspca_dev;
switch (sd->sensor) {
case SENSOR_HV7131R:
return (i2c_read(gspca_dev, 0x25) << 9)
| (i2c_read(gspca_dev, 0x26) << 1)
| (i2c_read(gspca_dev, 0x27) >> 7);
case SENSOR_OV7620:
return i2c_read(gspca_dev, 0x10);
default:
return -1;
}
}
static void setexposure(struct gspca_dev *gspca_dev, s32 val)
{
i2c_write(gspca_dev, 0x25, val >> 9, 0x00);
i2c_write(gspca_dev, 0x26, val >> 1, 0x00);
i2c_write(gspca_dev, 0x27, val << 7, 0x00);
struct sd *sd = (struct sd *) gspca_dev;
switch (sd->sensor) {
case SENSOR_HV7131R:
i2c_write(gspca_dev, 0x25, val >> 9, 0x00);
i2c_write(gspca_dev, 0x26, val >> 1, 0x00);
i2c_write(gspca_dev, 0x27, val << 7, 0x00);
break;
case SENSOR_OV7620:
i2c_write(gspca_dev, 0x10, val, 0x00);
break;
}
}
static void setquality(struct gspca_dev *gspca_dev)
@ -5918,7 +5936,12 @@ static void setlightfreq(struct gspca_dev *gspca_dev, s32 val)
static void setautogain(struct gspca_dev *gspca_dev, s32 val)
{
reg_w(gspca_dev, val ? 0x42 : 0x02, 0x0180);
struct sd *sd = (struct sd *) gspca_dev;
if (sd->sensor == SENSOR_OV7620)
i2c_write(gspca_dev, 0x13, val ? 0xa3 : 0x80, 0x00);
else
reg_w(gspca_dev, val ? 0x42 : 0x02, 0x0180);
}
/*
@ -6439,6 +6462,9 @@ static int sd_init_controls(struct gspca_dev *gspca_dev)
if (sd->sensor == SENSOR_HV7131R)
sd->exposure = v4l2_ctrl_new_std(hdl, &zcxx_ctrl_ops,
V4L2_CID_EXPOSURE, 0x30d, 0x493e, 1, 0x927);
else if (sd->sensor == SENSOR_OV7620)
sd->exposure = v4l2_ctrl_new_std(hdl, &zcxx_ctrl_ops,
V4L2_CID_EXPOSURE, 0, 255, 1, 0x41);
sd->autogain = v4l2_ctrl_new_std(hdl, &zcxx_ctrl_ops,
V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
if (sd->sensor != SENSOR_OV7630C)
@ -6458,7 +6484,7 @@ static int sd_init_controls(struct gspca_dev *gspca_dev)
return hdl->error;
}
v4l2_ctrl_cluster(3, &sd->gamma);
if (sd->sensor == SENSOR_HV7131R)
if (sd->sensor == SENSOR_HV7131R || sd->sensor == SENSOR_OV7620)
v4l2_ctrl_auto_cluster(2, &sd->autogain, 0, true);
return 0;
}