V4L/DVB (8366): gspca: Better code for ov6650 and ov7630.

sonixb:   Common code between ov6650 and ov7630.
          Fix brightness oscillation with ov6650 sensor.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 34 insertions, 57 deletions

diff --git a/drivers/media/video/gspca/sonixb.c b/drivers/media/video/gspca/sonixb.c
index 51435e3dbb10..4625a464a547 100644
--- a/drivers/media/video/gspca/sonixb.c
+++ b/drivers/media/video/gspca/sonixb.c
@@ -48,7 +48,6 @@ struct sd {
 
 	unsigned char fr_h_sz;		/* size of frame header */
 	char sensor;			/* Type of image sensor chip */
-	char sensor_has_gain;
 #define SENSOR_HV7131R 0
 #define SENSOR_OV6650 1
 #define SENSOR_OV7630 2
@@ -57,6 +56,8 @@ struct sd {
 #define SENSOR_PAS202 5
 #define SENSOR_TAS5110 6
 #define SENSOR_TAS5130CXX 7
+	char sensor_has_gain;
+	__u8 sensor_addr;
 };
 
 #define COMP2 0x8f
@@ -495,21 +496,14 @@ static void setbrightness(struct gspca_dev *gspca_dev)
 	__u8 value;
 
 	switch (sd->sensor) {
-	case SENSOR_OV6650: {
-		__u8 i2cOV6650[] =
-			{0xa0, 0x60, 0x06, 0x11, 0x99, 0x04, 0x94, 0x15};
-
-		i2cOV6650[3] = sd->brightness;
-		if (i2c_w(gspca_dev, i2cOV6650) < 0)
-			 goto err;
-		break;
-	    }
+	case  SENSOR_OV6650:
 	case  SENSOR_OV7630_3:
 	case  SENSOR_OV7630: {
 		__u8 i2cOV[] =
-			{0xa0, 0x21, 0x06, 0x36, 0xbd, 0x06, 0xf6, 0x16};
+			{0xa0, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x10};
 
 		/* change reg 0x06 */
+		i2cOV[1] = sd->sensor_addr;
 		i2cOV[3] = sd->brightness;
 		if (i2c_w(gspca_dev, i2cOV) < 0)
 			goto err;
@@ -579,6 +573,7 @@ err:
 static void setsensorgain(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
+	unsigned char gain = sd->gain;
 
 	switch (sd->sensor) {
 
@@ -586,23 +581,20 @@ static void setsensorgain(struct gspca_dev *gspca_dev)
 		__u8 i2c[] =
 			{0x30, 0x11, 0x02, 0x20, 0x70, 0x00, 0x00, 0x10};
 
-		i2c[4] = 255 - sd->gain;
+		i2c[4] = 255 - gain;
 		if (i2c_w(gspca_dev, i2c) < 0)
 			goto err;
 		break;
 	    }
-	case SENSOR_OV6650: {
-		__u8 i2c[] = {0xa0, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10};
 
-		i2c[3] = sd->gain >> 3;
-		if (i2c_w(gspca_dev, i2c) < 0)
-			goto err;
-		break;
-	    }
+	case SENSOR_OV6650:
+		gain >>= 1;
+		/* fall thru */
 	case SENSOR_OV7630_3: {
-		__u8 i2c[] = {0xa0, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10};
+		__u8 i2c[] = {0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10};
 
-		i2c[3] = sd->gain >> 2;
+		i2c[1] = sd->sensor_addr;
+		i2c[3] = gain >> 2;
 		if (i2c_w(gspca_dev, i2c) < 0)
 			goto err;
 		break;
@@ -652,9 +644,10 @@ static void setexposure(struct gspca_dev *gspca_dev)
 		reg_w(gspca_dev, 0x19, &reg, 1);
 		break;
 	    }
-	case SENSOR_OV6650: {
-		/* The ov6650 has 2 registers which both influence exposure,
-		   first there is register 11, whose low nibble sets the no fps
+	case SENSOR_OV6650:
+	case SENSOR_OV7630_3: {
+		/* The ov6650 / ov7630 have 2 registers which both influence
+		   exposure, register 11, whose low nibble sets the nr off fps
 		   according to: fps = 30 / (low_nibble + 1)
 
 		   The fps configures the maximum exposure setting, but it is
@@ -667,15 +660,15 @@ static void setexposure(struct gspca_dev *gspca_dev)
 		   The code maps our 0 - 510 ms exposure ctrl to these 2
 		   registers, trying to keep fps as high as possible.
 		*/
-		__u8 i2c[] = {0xb0, 0x60, 0x10, 0x00, 0xc0, 0x00, 0x00, 0x10};
+		__u8 i2c[] = {0xb0, 0x00, 0x10, 0x00, 0xc0, 0x00, 0x00, 0x10};
 		int reg10, reg11;
 		/* ov6645 datasheet says reg10_max is 9a, but that uses
 		   tline * 2 * reg10 as formula for calculating texpo, the
 		   ov6650 probably uses the same formula as the 7730 which uses
 		   tline * 4 * reg10, which explains why the reg10max we've
 		   found experimentally for the ov6650 is exactly half that of
-		   the ov6645. */
-		const int reg10_max = 0x4d;
+		   the ov6645. The ov7630 datasheet says the max is 0x41. */
+		const int reg10_max = (sd->sensor == SENSOR_OV6650)? 0x4d:0x41;
 
 		reg11 = (60 * sd->exposure + 999) / 1000;
 		if (reg11 < 1)
@@ -686,40 +679,18 @@ static void setexposure(struct gspca_dev *gspca_dev)
 		/* frame exposure time in ms = 1000 * reg11 / 30    ->
 		reg10 = sd->exposure * 2 * reg10_max / (1000 * reg11 / 30) */
 		reg10 = (sd->exposure * 60 * reg10_max) / (1000 * reg11);
-		if (reg10 < 1) /* 0 is a valid value, but is very _black_ */
-			reg10 = 1;
-		else if (reg10 > reg10_max)
-			reg10 = reg10_max;
 
-		/* Write reg 10 and reg11 low nibble */
-		i2c[3] = reg10;
-		i2c[4] |= reg11 - 1;
-		if (i2c_w(gspca_dev, i2c) < 0)
-			PDEBUG(D_ERR, "i2c error exposure");
-		break;
-	    }
-	case SENSOR_OV7630_3: {
-		__u8 i2c[] = {0xb0, 0x21, 0x10, 0x00, 0xc0, 0x00, 0x00, 0x10};
-		int reg10, reg11;
-		/* No clear idea why, but setting reg10 above this value
-		   results in no change */
-		const int reg10_max = 0x4d;
-
-		reg11 = (60 * sd->exposure + 999) / 1000;
-		if (reg11 < 1)
-			reg11 = 1;
-		else if (reg11 > 16)
-			reg11 = 16;
-
-		/* frame exposure time in ms = 1000 * reg11 / 30    ->
-		reg10 = sd->exposure * 2 * reg10_max / (1000 * reg11 / 30) */
-		reg10 = (sd->exposure * 60 * reg10_max) / (1000 * reg11);
-		if (reg10 < 1) /* 0 is a valid value, but is very _black_ */
-			reg10 = 1;
+		/* Don't allow this to get below 10 when using autogain, the
+		   steps become very large (relatively) when below 10 causing
+		   the image to oscilate from much too dark, to much too bright
+		   and back again. */
+		if (sd->autogain && reg10 < 10)
+			reg10 = 10;
 		else if (reg10 > reg10_max)
 			reg10 = reg10_max;
 
 		/* Write reg 10 and reg11 low nibble */
+		i2c[1] = sd->sensor_addr;
 		i2c[3] = reg10;
 		i2c[4] |= reg11 - 1;
 		if (i2c_w(gspca_dev, i2c) < 0)
@@ -770,8 +741,11 @@ static void do_autogain(struct gspca_dev *gspca_dev)
 		sd->autogain_ignore_frames--;
 	else if (gspca_auto_gain_n_exposure(gspca_dev, avg_lum,
 			sd->brightness * DESIRED_AVG_LUM / 127,
-			AUTOGAIN_DEADZONE, GAIN_KNEE, EXPOSURE_KNEE))
+			AUTOGAIN_DEADZONE, GAIN_KNEE, EXPOSURE_KNEE)) {
+		PDEBUG(D_FRAM, "autogain: gain changed: gain: %d expo: %d\n",
+			(int)sd->gain, (int)sd->exposure);
 		sd->autogain_ignore_frames = AUTOGAIN_IGNORE_FRAMES;
+	}
 }
 
 /* this function is called at probe time */
@@ -814,6 +788,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
 		case 0x6011:			/* SN9C101 - SN9C101G */
 			sd->sensor = SENSOR_OV6650;
 			sd->sensor_has_gain = 1;
+			sd->sensor_addr = 0x60;
 			sd->sd_desc.nctrls = 4;
 			sd->sd_desc.dq_callback = do_autogain;
 			sif = 1;
@@ -822,9 +797,11 @@ static int sd_config(struct gspca_dev *gspca_dev,
 		case 0x602c:			/* SN9C102 */
 		case 0x602e:			/* SN9C102 */
 			sd->sensor = SENSOR_OV7630;
+			sd->sensor_addr = 0x21;
 			break;
 		case 0x60b0:			/* SN9C103 */
 			sd->sensor = SENSOR_OV7630_3;
+			sd->sensor_addr = 0x21;
 			sd->fr_h_sz = 18;	/* size of frame header */
 			sd->sensor_has_gain = 1;
 			sd->sd_desc.nctrls = 4;