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Message-Id: <20201006203817.8173-1-trix@redhat.com>
Date: Tue, 6 Oct 2020 13:38:17 -0700
From: trix@...hat.com
To: corbet@....net, mchehab@...nel.org
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
Tom Rix <trix@...hat.com>
Subject: [PATCH] media: ov7670: do not aggregate returns
From: Tom Rix <trix@...hat.com>
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@...hat.com>
---
drivers/media/i2c/ov7670.c | 96 ++++++++++++++++++++++----------------
1 file changed, 56 insertions(+), 40 deletions(-)
diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index b42b289faaef..d2df811b1a40 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/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;
--
2.18.1
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