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iio: proximity: vcnl3020: add DMA safe buffer

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Add DMA safe buffer for bulk transfers.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Link: https://lore.kernel.org/r/20210722154420.915082-2-i.mikhaylov@yadro.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Ivan Mikhaylov 2021-07-22 18:44:18 +03:00 committed by Jonathan Cameron
parent 9c6cd755b5
commit f5e9e38e70
1 changed files with 5 additions and 4 deletions
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9
drivers/iio/proximity/vcnl3020.c
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@ -57,12 +57,14 @@ static const int vcnl3020_prox_sampling_frequency[][2] = {
* @dev: vcnl3020 device.
* @rev: revision id.
* @lock: lock for protecting access to device hardware registers.
* @buf: DMA safe __be16 buffer.
*/
struct vcnl3020_data {
struct regmap *regmap;
struct device *dev;
u8 rev;
struct mutex lock;
__be16 buf ____cacheline_aligned;
};
/**
@ -144,7 +146,6 @@ static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
{
int rc;
unsigned int reg;
__be16 res;
mutex_lock(&data->lock);
@ -163,12 +164,12 @@ static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
}
/* high & low result bytes read */
rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &res,
sizeof(res));
rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &data->buf,
sizeof(data->buf));
if (rc)
goto err_unlock;
*val = be16_to_cpu(res);
*val = be16_to_cpu(data->buf);
err_unlock:
mutex_unlock(&data->lock);