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

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: 1f25ca11d8 ("iio: temperature: add support for Maxim
thermocouple chips")
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
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;