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iio: vcnl4000: Fix i2c swapped word reading.

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The bytes returned by the i2c reading need to be swapped
unconditionally. Otherwise, on be16 platforms, an incorrect value will be
returned.

Taking the slow path via next merge window as its been around a while
and we have a patch set dependent on this which would be held up.

Fixes: 62a1efb9f8 ("iio: add vcnl4000 combined ALS and proximity sensor")
Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mathieu Othacehe 2020-05-03 11:29:55 +02:00 committed by Jonathan Cameron
parent b7190859ab
commit 18dfb53263
1 changed files with 2 additions and 4 deletions
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6
drivers/iio/light/vcnl4000.c
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@ -220,7 +220,6 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
u8 rdy_mask, u8 data_reg, int *val)
{
int tries = 20;
__be16 buf;
int ret;
mutex_lock(&data->vcnl4000_lock);
@ -247,13 +246,12 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
goto fail;
}
ret = i2c_smbus_read_i2c_block_data(data->client,
data_reg, sizeof(buf), (u8 *) &buf);
ret = i2c_smbus_read_word_swapped(data->client, data_reg);
if (ret < 0)
goto fail;
mutex_unlock(&data->vcnl4000_lock);
*val = be16_to_cpu(buf);
*val = ret;
return 0;