V4L/DVB: gspca - ov534: Add Auto Exposure

This also makes manual exposure actually work: it never worked before
because AEC was always enabled.
Signed-off-by: Max Thrun <bear24rw@gmail.com>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/ov534.c

@@ -62,6 +62,7 @@ struct sd {
 	u8 exposure;
 	u8 agc;
 	u8 awb;
+	u8 aec;
 	s8 sharpness;
 	u8 hflip;
 	u8 vflip;
@@ -83,6 +84,8 @@ static int sd_setvflip(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getvflip(struct gspca_dev *gspca_dev, __s32 *val);
 static int sd_setawb(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getawb(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_setaec(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getaec(struct gspca_dev *gspca_dev, __s32 *val);
 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
 static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val);
@@ -175,6 +178,20 @@ static const struct ctrl sd_ctrls[] = {
 	.get = sd_getawb,
     },
     {							/* 6 */
+	{
+		.id      = V4L2_CID_EXPOSURE_AUTO,
+		.type    = V4L2_CTRL_TYPE_BOOLEAN,
+		.name    = "Auto Exposure",
+		.minimum = 0,
+		.maximum = 1,
+		.step    = 1,
+#define AEC_DEF 1
+		.default_value = AEC_DEF,
+	},
+	.set = sd_setaec,
+	.get = sd_getaec,
+    },
+    {							/* 7 */
 	{
 	    .id      = V4L2_CID_SHARPNESS,
 	    .type    = V4L2_CTRL_TYPE_INTEGER,
@@ -188,7 +205,7 @@ static const struct ctrl sd_ctrls[] = {
 	.set = sd_setsharpness,
 	.get = sd_getsharpness,
     },
-    {							/* 7 */
+    {							/* 8 */
 	{
 	    .id      = V4L2_CID_HFLIP,
 	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
@@ -202,7 +219,7 @@ static const struct ctrl sd_ctrls[] = {
 	.set = sd_sethflip,
 	.get = sd_gethflip,
     },
-    {							/* 8 */
+    {							/* 9 */
 	{
 	    .id      = V4L2_CID_VFLIP,
 	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
@@ -703,6 +720,20 @@ static void setawb(struct gspca_dev *gspca_dev)
 		sccb_reg_write(gspca_dev, 0x63, 0xaa);	/* AWB off */
 }
 
+static void setaec(struct gspca_dev *gspca_dev)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+
+	if (sd->aec)
+		sccb_reg_write(gspca_dev, 0x13,
+				sccb_reg_read(gspca_dev, 0x13) | 0x01);
+	else {
+		sccb_reg_write(gspca_dev, 0x13,
+				sccb_reg_read(gspca_dev, 0x13) & ~0x01);
+		setexposure(gspca_dev);
+	}
+}
+
 static void setsharpness(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
@@ -768,6 +799,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
 #if AWB_DEF != 0
 	sd->awb = AWB_DEF
 #endif
+	sd->aec = AEC_DEF;
 #if SHARPNESS_DEF != 0
 	sd->sharpness = SHARPNESS_DEF;
 #endif
@@ -838,6 +870,7 @@ static int sd_start(struct gspca_dev *gspca_dev)
 
 	setagc(gspca_dev);
 	setawb(gspca_dev);
+	setaec(gspca_dev);
 	setgain(gspca_dev);
 	setexposure(gspca_dev);
 	setbrightness(gspca_dev);
@@ -1066,6 +1099,24 @@ static int sd_getawb(struct gspca_dev *gspca_dev, __s32 *val)
 	return 0;
 }
 
+static int sd_setaec(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+
+	sd->aec = val;
+	if (gspca_dev->streaming)
+		setaec(gspca_dev);
+	return 0;
+}
+
+static int sd_getaec(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+
+	*val = sd->aec;
+	return 0;
+}
+
 static int sd_setsharpness(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;