[media] Fix 64-bit division fall-out from 64-bit control ranges

Commit 0ba2aeb6 increased the internal control ranges
to 64 bit, but that caused problems in drivers that use the minimum/maximum/step/default_value
control values in a division or modulus operations since not all architectures support
those natively.

Luckily, in almost all cases it is possible to just cast to 32 bits (the control value
is known to be 32 bits, so it is safe to cast). Only in v4l2-ctrls.c was it necessary to
use do_div in one function.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/i2c/soc_camera/mt9m001.c

@@ -403,7 +403,7 @@ static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
 		if (ctrl->val <= ctrl->default_value) {
 			/* Pack it into 0..1 step 0.125, register values 0..8 */
 			unsigned long range = ctrl->default_value - ctrl->minimum;
-			data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
+			data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
 
 			dev_dbg(&client->dev, "Setting gain %d\n", data);
 			data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
@@ -413,7 +413,7 @@ static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
 			/* Pack it into 1.125..15 variable step, register values 9..67 */
 			/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 			unsigned long range = ctrl->maximum - ctrl->default_value - 1;
-			unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
+			unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
 					       111 + range / 2) / range + 9;
 
 			if (gain <= 32)
@@ -434,7 +434,7 @@ static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_EXPOSURE_AUTO:
 		if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 			unsigned long range = exp->maximum - exp->minimum;
-			unsigned long shutter = ((exp->val - exp->minimum) * 1048 +
+			unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 +
 						 range / 2) / range + 1;
 
 			dev_dbg(&client->dev,

drivers/media/i2c/soc_camera/mt9t031.c

@@ -474,7 +474,7 @@ static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
 		if (ctrl->val <= ctrl->default_value) {
 			/* Pack it into 0..1 step 0.125, register values 0..8 */
 			unsigned long range = ctrl->default_value - ctrl->minimum;
-			data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
+			data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
 
 			dev_dbg(&client->dev, "Setting gain %d\n", data);
 			data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
@@ -485,7 +485,7 @@ static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
 			/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 			unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 			/* calculated gain: map 65..127 to 9..1024 step 0.125 */
-			unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
+			unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
 					       1015 + range / 2) / range + 9;
 
 			if (gain <= 32)		/* calculated gain 9..32 -> 9..32 */
@@ -507,7 +507,7 @@ static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_EXPOSURE_AUTO:
 		if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 			unsigned int range = exp->maximum - exp->minimum;
-			unsigned int shutter = ((exp->val - exp->minimum) * 1048 +
+			unsigned int shutter = ((exp->val - (s32)exp->minimum) * 1048 +
 						 range / 2) / range + 1;
 			u32 old;
 

drivers/media/i2c/soc_camera/mt9v022.c

@@ -583,7 +583,7 @@ static int mt9v022_s_ctrl(struct v4l2_ctrl *ctrl)
 			/* mt9v022 has minimum == default */
 			unsigned long range = gain->maximum - gain->minimum;
 			/* Valid values 16 to 64, 32 to 64 must be even. */
-			unsigned long gain_val = ((gain->val - gain->minimum) *
+			unsigned long gain_val = ((gain->val - (s32)gain->minimum) *
 					      48 + range / 2) / range + 16;
 
 			if (gain_val >= 32)
@@ -608,7 +608,7 @@ static int mt9v022_s_ctrl(struct v4l2_ctrl *ctrl)
 		} else {
 			struct v4l2_ctrl *exp = mt9v022->exposure;
 			unsigned long range = exp->maximum - exp->minimum;
-			unsigned long shutter = ((exp->val - exp->minimum) *
+			unsigned long shutter = ((exp->val - (s32)exp->minimum) *
 					479 + range / 2) / range + 1;
 
 			/*

drivers/media/radio/radio-keene.c

@@ -265,7 +265,7 @@ static int keene_s_ctrl(struct v4l2_ctrl *ctrl)
 		return keene_cmd_set(radio);
 
 	case V4L2_CID_AUDIO_COMPRESSION_GAIN:
-		radio->tx = db2tx[(ctrl->val - ctrl->minimum) / ctrl->step];
+		radio->tx = db2tx[(ctrl->val - (s32)ctrl->minimum) / (s32)ctrl->step];
 		return keene_cmd_set(radio);
 	}
 	return -EINVAL;

drivers/media/usb/gspca/autogain_functions.c

@@ -121,9 +121,9 @@ int gspca_coarse_grained_expo_autogain(
 	orig_gain = gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
 	orig_exposure = exposure = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
 
-	gain_low  = (gspca_dev->gain->maximum - gspca_dev->gain->minimum) /
+	gain_low  = (s32)(gspca_dev->gain->maximum - gspca_dev->gain->minimum) /
 		    5 * 2 + gspca_dev->gain->minimum;
-	gain_high = (gspca_dev->gain->maximum - gspca_dev->gain->minimum) /
+	gain_high = (s32)(gspca_dev->gain->maximum - gspca_dev->gain->minimum) /
 		    5 * 4 + gspca_dev->gain->minimum;
 
 	/* If we are of a multiple of deadzone, do multiple steps to reach the

drivers/media/usb/gspca/pac7302.c

@@ -394,9 +394,9 @@ static void setbrightcont(struct gspca_dev *gspca_dev)
 	reg_w(gspca_dev, 0xff, 0x00);		/* page 0 */
 	for (i = 0; i < 10; i++) {
 		v = max[i];
-		v += (sd->brightness->val - sd->brightness->maximum)
-			* 150 / sd->brightness->maximum; /* 200 ? */
-		v -= delta[i] * sd->contrast->val / sd->contrast->maximum;
+		v += (sd->brightness->val - (s32)sd->brightness->maximum)
+			* 150 / (s32)sd->brightness->maximum; /* 200 ? */
+		v -= delta[i] * sd->contrast->val / (s32)sd->contrast->maximum;
 		if (v < 0)
 			v = 0;
 		else if (v > 0xff)
@@ -419,7 +419,7 @@ static void setcolors(struct gspca_dev *gspca_dev)
 	reg_w(gspca_dev, 0x11, 0x01);
 	reg_w(gspca_dev, 0xff, 0x00);			/* page 0 */
 	for (i = 0; i < 9; i++) {
-		v = a[i] * sd->saturation->val / sd->saturation->maximum;
+		v = a[i] * sd->saturation->val / (s32)sd->saturation->maximum;
 		v += b[i];
 		reg_w(gspca_dev, 0x0f + 2 * i, (v >> 8) & 0x07);
 		reg_w(gspca_dev, 0x0f + 2 * i + 1, v);

drivers/media/usb/gspca/sonixb.c

@@ -913,7 +913,7 @@ static void do_autogain(struct gspca_dev *gspca_dev)
 				desired_avg_lum, deadzone))
 			sd->autogain_ignore_frames = AUTOGAIN_IGNORE_FRAMES;
 	} else {
-		int gain_knee = gspca_dev->gain->maximum * 9 / 10;
+		int gain_knee = (s32)gspca_dev->gain->maximum * 9 / 10;
 		if (gspca_expo_autogain(gspca_dev, avg_lum, desired_avg_lum,
 				deadzone, gain_knee, sd->exposure_knee))
 			sd->autogain_ignore_frames = AUTOGAIN_IGNORE_FRAMES;

drivers/media/v4l2-core/v4l2-ctrls.c

@@ -1303,7 +1303,7 @@ static void std_log(const struct v4l2_ctrl *ctrl)
 	val = clamp_t(typeof(val), val,				\
 		      (ctrl)->minimum, (ctrl)->maximum);	\
 	offset = (val) - (ctrl)->minimum;			\
-	offset = (ctrl)->step * (offset / (ctrl)->step);	\
+	offset = (ctrl)->step * (offset / (s32)(ctrl)->step);	\
 	val = (ctrl)->minimum + offset;				\
 	0;							\
 })
@@ -1313,12 +1313,24 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
 			union v4l2_ctrl_ptr ptr)
 {
 	size_t len;
+	u64 offset;
+	s64 val;
 
 	switch (ctrl->type) {
 	case V4L2_CTRL_TYPE_INTEGER:
 		return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
 	case V4L2_CTRL_TYPE_INTEGER64:
-		return ROUND_TO_RANGE(ptr.p_s64[idx], u64, ctrl);
+		/*
+		 * We can't use the ROUND_TO_RANGE define here due to
+		 * the u64 divide that needs special care.
+		 */
+		val = ptr.p_s64[idx];
+		val += ctrl->step / 2;
+		val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
+		offset = val - ctrl->minimum;
+		do_div(offset, ctrl->step);
+		ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
+		return 0;
 	case V4L2_CTRL_TYPE_U8:
 		return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
 	case V4L2_CTRL_TYPE_U16:
@@ -1353,7 +1365,7 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
 		len = strlen(ptr.p_char + idx);
 		if (len < ctrl->minimum)
 			return -ERANGE;
-		if ((len - ctrl->minimum) % ctrl->step)
+		if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
 			return -ERANGE;
 		return 0;