media: ov7670: do not aggregate returns

Adding muliple status together loses individual failures.
Check each status separately.

Clean up some other returns for consistency.

Fixed several coding style problems by running
the file through checkpatch.pl --fix-inplace
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov7670.c

@@ -561,6 +561,7 @@ static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
 		unsigned char *value)
 {
 	struct ov7670_info *info = to_state(sd);
+
 	if (info->use_smbus)
 		return ov7670_read_smbus(sd, reg, value);
 	else
@@ -571,6 +572,7 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
 		unsigned char value)
 {
 	struct ov7670_info *info = to_state(sd);
+
 	if (info->use_smbus)
 		return ov7670_write_smbus(sd, reg, value);
 	else
@@ -597,6 +599,7 @@ static int ov7670_write_array(struct v4l2_subdev *sd, struct regval_list *vals)
 {
 	while (vals->reg_num != 0xff || vals->value != 0xff) {
 		int ret = ov7670_write(sd, vals->reg_num, vals->value);
+
 		if (ret < 0)
 			return ret;
 		vals++;
@@ -921,27 +924,38 @@ static int ov7670_set_hw(struct v4l2_subdev *sd, int hstart, int hstop,
 {
 	int ret;
 	unsigned char v;
-/*
- * Horizontal: 11 bits, top 8 live in hstart and hstop.  Bottom 3 of
- * hstart are in href[2:0], bottom 3 of hstop in href[5:3].  There is
- * a mystery "edge offset" value in the top two bits of href.
- */
-	ret =  ov7670_write(sd, REG_HSTART, (hstart >> 3) & 0xff);
-	ret += ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff);
-	ret += ov7670_read(sd, REG_HREF, &v);
+	/*
+	 * Horizontal: 11 bits, top 8 live in hstart and hstop.  Bottom 3 of
+	 * hstart are in href[2:0], bottom 3 of hstop in href[5:3].  There is
+	 * a mystery "edge offset" value in the top two bits of href.
+	 */
+	ret = ov7670_write(sd, REG_HSTART, (hstart >> 3) & 0xff);
+	if (ret)
+		return ret;
+	ret = ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff);
+	if (ret)
+		return ret;
+	ret = ov7670_read(sd, REG_HREF, &v);
+	if (ret)
+		return ret;
 	v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
 	msleep(10);
-	ret += ov7670_write(sd, REG_HREF, v);
-/*
- * Vertical: similar arrangement, but only 10 bits.
- */
-	ret += ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff);
-	ret += ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff);
-	ret += ov7670_read(sd, REG_VREF, &v);
+	ret = ov7670_write(sd, REG_HREF, v);
+	if (ret)
+		return ret;
+	/* Vertical: similar arrangement, but only 10 bits. */
+	ret = ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff);
+	if (ret)
+		return ret;
+	ret = ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff);
+	if (ret)
+		return ret;
+	ret = ov7670_read(sd, REG_VREF, &v);
+	if (ret)
+		return ret;
 	v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
 	msleep(10);
-	ret += ov7670_write(sd, REG_VREF, v);
-	return ret;
+	return ov7670_write(sd, REG_VREF, v);
 }
 
 
@@ -1245,6 +1259,7 @@ static int ov7670_enum_frame_size(struct v4l2_subdev *sd,
 	 */
 	for (i = 0; i < n_win_sizes; i++) {
 		struct ov7670_win_size *win = &info->devtype->win_sizes[i];
+
 		if (info->min_width && win->width < info->min_width)
 			continue;
 		if (info->min_height && win->height < info->min_height)
@@ -1285,17 +1300,17 @@ static int ov7670_store_cmatrix(struct v4l2_subdev *sd,
 				raw = 0xff;
 			else
 				raw = (-1 * matrix[i]) & 0xff;
-		}
-		else {
+		} else {
 			if (matrix[i] > 255)
 				raw = 0xff;
 			else
 				raw = matrix[i] & 0xff;
 		}
-		ret += ov7670_write(sd, REG_CMATRIX_BASE + i, raw);
+		ret = ov7670_write(sd, REG_CMATRIX_BASE + i, raw);
+		if (ret)
+			return ret;
 	}
-	ret += ov7670_write(sd, REG_CMATRIX_SIGN, signbits);
-	return ret;
+	return ov7670_write(sd, REG_CMATRIX_SIGN, signbits);
 }
 
 
@@ -1381,11 +1396,9 @@ static int ov7670_s_sat_hue(struct v4l2_subdev *sd, int sat, int hue)
 {
 	struct ov7670_info *info = to_state(sd);
 	int matrix[CMATRIX_LEN];
-	int ret;
 
 	ov7670_calc_cmatrix(info, matrix, sat, hue);
-	ret = ov7670_store_cmatrix(sd, matrix);
-	return ret;
+	return ov7670_store_cmatrix(sd, matrix);
 }
 
 
@@ -1403,14 +1416,12 @@ static unsigned char ov7670_abs_to_sm(unsigned char v)
 static int ov7670_s_brightness(struct v4l2_subdev *sd, int value)
 {
 	unsigned char com8 = 0, v;
-	int ret;
 
 	ov7670_read(sd, REG_COM8, &com8);
 	com8 &= ~COM8_AEC;
 	ov7670_write(sd, REG_COM8, com8);
 	v = ov7670_abs_to_sm(value);
-	ret = ov7670_write(sd, REG_BRIGHT, v);
-	return ret;
+	return ov7670_write(sd, REG_BRIGHT, v);
 }
 
 static int ov7670_s_contrast(struct v4l2_subdev *sd, int value)
@@ -1424,13 +1435,14 @@ static int ov7670_s_hflip(struct v4l2_subdev *sd, int value)
 	int ret;
 
 	ret = ov7670_read(sd, REG_MVFP, &v);
+	if (ret)
+		return ret;
 	if (value)
 		v |= MVFP_MIRROR;
 	else
 		v &= ~MVFP_MIRROR;
 	msleep(10);  /* FIXME */
-	ret += ov7670_write(sd, REG_MVFP, v);
-	return ret;
+	return ov7670_write(sd, REG_MVFP, v);
 }
 
 static int ov7670_s_vflip(struct v4l2_subdev *sd, int value)
@@ -1439,13 +1451,14 @@ static int ov7670_s_vflip(struct v4l2_subdev *sd, int value)
 	int ret;
 
 	ret = ov7670_read(sd, REG_MVFP, &v);
+	if (ret)
+		return ret;
 	if (value)
 		v |= MVFP_FLIP;
 	else
 		v &= ~MVFP_FLIP;
 	msleep(10);  /* FIXME */
-	ret += ov7670_write(sd, REG_MVFP, v);
-	return ret;
+	return ov7670_write(sd, REG_MVFP, v);
 }
 
 /*
@@ -1460,8 +1473,10 @@ static int ov7670_g_gain(struct v4l2_subdev *sd, __s32 *value)
 	unsigned char gain;
 
 	ret = ov7670_read(sd, REG_GAIN, &gain);
+	if (ret)
+		return ret;
 	*value = gain;
-	return ret;
+	return 0;
 }
 
 static int ov7670_s_gain(struct v4l2_subdev *sd, int value)
@@ -1470,12 +1485,13 @@ static int ov7670_s_gain(struct v4l2_subdev *sd, int value)
 	unsigned char com8;
 
 	ret = ov7670_write(sd, REG_GAIN, value & 0xff);
+	if (ret)
+		return ret;
 	/* Have to turn off AGC as well */
-	if (ret == 0) {
-		ret = ov7670_read(sd, REG_COM8, &com8);
-		ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC);
-	}
-	return ret;
+	ret = ov7670_read(sd, REG_COM8, &com8);
+	if (ret)
+		return ret;
+	return ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC);
 }
 
 /*
@@ -1680,13 +1696,13 @@ static int ov7670_s_power(struct v4l2_subdev *sd, int on)
 		return 0;
 
 	if (on) {
-		ov7670_power_on (sd);
+		ov7670_power_on(sd);
 		ov7670_init(sd, 0);
 		ov7670_apply_fmt(sd);
 		ov7675_apply_framerate(sd);
 		v4l2_ctrl_handler_setup(&info->hdl);
 	} else {
-		ov7670_power_off (sd);
+		ov7670_power_off(sd);
 	}
 
 	return 0;