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iio: mlx96014: Error checking from positive to negative

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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>
This commit is contained in:
Crt Mori 2015-10-02 14:24:21 +02:00 committed by Jonathan Cameron
parent c05dc2cce7
commit 1de953e77b
1 changed files with 8 additions and 6 deletions
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14
drivers/iio/temperature/mlx90614.c
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@ -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;
}