diff options
| author | Crt Mori <cmo@melexis.com> | 2015-10-02 14:24:21 +0200 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-10-03 10:15:25 +0100 |
| commit | 1de953e77b8c8b8cb6f734733cf20e95a1b0fbb8 (patch) | |
| tree | a482c774bd4097f91bff9a84f6aa061be16106ff /drivers/iio | |
| parent | c05dc2cce7422a5c05db470572b22fcd855f8cd7 (diff) | |
| download | linux-1de953e77b8c8b8cb6f734733cf20e95a1b0fbb8.tar.bz2 | |
iio: mlx96014: Error checking from positive to negative
Dan Carpenter reported a static checker report and after his mail I
noticed that we actually return from function if positive value is
obtained from i2c read. This was remainder from when code was not in
separate function (which I changed during the review process).
Static checker reported
drivers/iio/temperature/mlx90614.c:167
mlx90614_iir_search()
warn: this cast is a no-op
which meant that cast before negating is useless. Dan also proposed a
solution on nicer bit operation form.
Also changed magic number to macro in process as that was confusing.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Crt Mori <cmo@melexis.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/temperature/mlx90614.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c index 3fd3ba426a84..a570c2e2aac3 100644 --- a/drivers/iio/temperature/mlx90614.c +++ b/drivers/iio/temperature/mlx90614.c @@ -72,6 +72,7 @@ #define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */ #define MLX90614_CONST_RAW_EMISSIVITY_MAX 65535 /* max value for emissivity */ #define MLX90614_CONST_EMISSIVITY_RESOLUTION 15259 /* 1/65535 ~ 0.000015259 */ +#define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */ struct mlx90614_data { struct i2c_client *client; @@ -156,15 +157,16 @@ static inline s32 mlx90614_iir_search(const struct i2c_client *client, * changes */ ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); - if (ret > 0) + if (ret < 0) return ret; + ret &= ~MLX90614_CONFIG_FIR_MASK; + ret |= MLX90614_CONST_FIR << MLX90614_CONFIG_FIR_SHIFT; + ret &= ~MLX90614_CONFIG_IIR_MASK; + ret |= i << MLX90614_CONFIG_IIR_SHIFT; + /* Write changed values */ - ret = mlx90614_write_word(client, MLX90614_CONFIG, - (i << MLX90614_CONFIG_IIR_SHIFT) | - (((u16) ((0x7 << MLX90614_CONFIG_FIR_SHIFT) | - ((u16) ret & (~((u16) MLX90614_CONFIG_FIR_MASK))))) & - (~(u16) MLX90614_CONFIG_IIR_MASK))); + ret = mlx90614_write_word(client, MLX90614_CONFIG, ret); return ret; } |