V4L/DVB (12978): gspca - m5602-ov7660: Add red gain control

Hook up the red gain controller
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

@@ -22,6 +22,8 @@ static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val);
 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val);
 static int ov7660_get_blue_gain(struct gspca_dev *gspca_dev, __s32 *val);
 static int ov7660_set_blue_gain(struct gspca_dev *gspca_dev, __s32 val);
+static int ov7660_get_red_gain(struct gspca_dev *gspca_dev, __s32 *val);
+static int ov7660_set_red_gain(struct gspca_dev *gspca_dev, __s32 val);
 
 const static struct ctrl ov7660_ctrls[] = {
 #define GAIN_IDX 1
@@ -54,7 +56,21 @@ const static struct ctrl ov7660_ctrls[] = {
 		.set = ov7660_set_blue_gain,
 		.get = ov7660_get_blue_gain
 	},
-
+#define RED_BALANCE_IDX 3
+	{
+		{
+			.id		= V4L2_CID_RED_BALANCE,
+			.type		= V4L2_CTRL_TYPE_INTEGER,
+			.name		= "red balance",
+			.minimum	= 0x00,
+			.maximum	= 0x7f,
+			.step		= 0x1,
+			.default_value	= OV7660_DEFAULT_RED_GAIN,
+			.flags		= V4L2_CTRL_FLAG_SLIDER
+		},
+		.set = ov7660_set_red_gain,
+		.get = ov7660_get_red_gain
+	},
 };
 
 static struct v4l2_pix_format ov7660_modes[] = {
@@ -237,6 +253,31 @@ static int ov7660_set_blue_gain(struct gspca_dev *gspca_dev, __s32 val)
 	return err;
 }
 
+static int ov7660_get_red_gain(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	*val = sensor_settings[RED_BALANCE_IDX];
+	PDEBUG(D_V4L2, "Read red balance %d", *val);
+	return 0;
+}
+
+static int ov7660_set_red_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, "Setting red balance to %d", val);
+
+	sensor_settings[RED_BALANCE_IDX] = val;
+
+	err = m5602_write_sensor(sd, OV7660_RED_GAIN, &i2c_data, 1);
+	return err;
+}
+
 static void ov7660_dump_registers(struct sd *sd)
 {
 	int address;