Commit f5e9e38e authored by Ivan Mikhaylov's avatar Ivan Mikhaylov Committed by Jonathan Cameron
Browse files

iio: proximity: vcnl3020: add DMA safe buffer 



Add DMA safe buffer for bulk transfers.

Signed-off-by: default avatarIvan Mikhaylov <i.mikhaylov@yadro.com>
Link: https://lore.kernel.org/r/20210722154420.915082-2-i.mikhaylov@yadro.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 9c6cd755

drivers/iio/proximity/vcnl3020.c

+5 −4
Original line number Diff line number Diff line
@@ -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);