V4L/DVB (12982): gspca - m5602-ov7660: Add auto gain ctrl
Erik Andrén [Sat, 20 Jun 2009 12:29:00 +0000 (09:29 -0300)]
Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/m5602/m5602_ov7660.c

index 7d2af08..855c058 100644 (file)
@@ -28,6 +28,8 @@ static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
                                         __s32 *val);
 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
                                         __s32 val);
+static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val);
+static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val);
 
 
 const static struct ctrl ov7660_ctrls[] = {
@@ -90,7 +92,20 @@ const static struct ctrl ov7660_ctrls[] = {
                .set = ov7660_set_auto_white_balance,
                .get = ov7660_get_auto_white_balance
        },
-
+#define AUTO_GAIN_CTRL_IDX 5
+       {
+               {
+                       .id             = V4L2_CID_AUTOGAIN,
+                       .type           = V4L2_CTRL_TYPE_BOOLEAN,
+                       .name           = "auto gain control",
+                       .minimum        = 0,
+                       .maximum        = 1,
+                       .step           = 1,
+                       .default_value  = 1
+               },
+               .set = ov7660_set_auto_gain,
+               .get = ov7660_get_auto_gain
+       },
 };
 
 static struct v4l2_pix_format ov7660_modes[] = {
@@ -207,6 +222,11 @@ int ov7660_init(struct sd *sd)
        if (err < 0)
                return err;
 
+       err = ov7660_set_auto_gain(&sd->gspca_dev,
+               sensor_settings[AUTO_GAIN_CTRL_IDX]);
+       if (err < 0)
+               return err;
+
        err = ov7660_set_blue_gain(&sd->gspca_dev,
                sensor_settings[BLUE_BALANCE_IDX]);
        if (err < 0)
@@ -342,6 +362,35 @@ static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
        return err;
 }
 
+static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       s32 *sensor_settings = sd->sensor_priv;
+
+       *val = sensor_settings[AUTO_GAIN_CTRL_IDX];
+       PDEBUG(D_V4L2, "Read auto gain control %d", *val);
+       return 0;
+}
+
+static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
+{
+       int err;
+       u8 i2c_data;
+       struct sd *sd = (struct sd *) gspca_dev;
+       s32 *sensor_settings = sd->sensor_priv;
+
+       PDEBUG(D_V4L2, "Set auto gain control to %d", val);
+
+       sensor_settings[AUTO_GAIN_CTRL_IDX] = val;
+       err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
+       if (err < 0)
+               return err;
+
+       i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
+
+       return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
+}
+
 static void ov7660_dump_registers(struct sd *sd)
 {
        int address;