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iio: maxim_thermocouple: Align 16 bit big endian value of raw reads

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Driver was reporting invalid raw read values for MAX6675 on big
endian architectures. MAX6675 buffered mode is not affected, nor
is the MAX31855.

The driver was losing a 2 byte read value when it used a 32 bit
integer buffer to store a 16 bit big endian value. Use big endian
types to properly align buffers on big endian architectures.

Fixes following sparse endianness warnings:
warning: cast to restricted __be16
warning: cast to restricted __be32
Fixes checkpatch issue:
CHECK: No space is necessary after a cast

Signed-off-by: sayli karnik <karniksayli1995@gmail.com>
Fixes: 1f25ca11d84a ("iio: temperature: add support for Maxim
thermocouple chips")
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
sayli karnik 2016-09-28 21:46:51 +05:30 committed by Jonathan Cameron
parent 0ae952e3bd
commit 231147ee77
1 changed files with 9 additions and 7 deletions
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16
drivers/iio/temperature/maxim_thermocouple.c
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@ -123,22 +123,24 @@ static int maxim_thermocouple_read(struct maxim_thermocouple_data *data,
{
unsigned int storage_bytes = data->chip->read_size;
unsigned int shift = chan->scan_type.shift + (chan->address * 8);
unsigned int buf;
__be16 buf16;
__be32 buf32;
int ret;
ret = spi_read(data->spi, (void *) &buf, storage_bytes);
if (ret)
return ret;
switch (storage_bytes) {
case 2:
*val = be16_to_cpu(buf);
ret = spi_read(data->spi, (void *)&buf16, storage_bytes);
*val = be16_to_cpu(buf16);
break;
case 4:
*val = be32_to_cpu(buf);
ret = spi_read(data->spi, (void *)&buf32, storage_bytes);
*val = be32_to_cpu(buf32);
break;
}
if (ret)
return ret;
/* check to be sure this is a valid reading */
if (*val & data->chip->status_bit)
return -EINVAL;