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iio: light: vl6180: Avoid readback of integration time register 

Instead of reading the value from the register on each query, store the
set value.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stefan Brüns 2017-09-24 23:59:18 +02:00 committed by Jonathan Cameron
parent 1e2ed3d0d2
commit df698c0402
1 changed files with 9 additions and 6 deletions
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15
drivers/iio/light/vl6180.c
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@ -86,6 +86,7 @@
struct vl6180_data {
struct i2c_client *client;
struct mutex lock;
unsigned int als_it_ms;
};
enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX };
@ -306,13 +307,11 @@ static int vl6180_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
ret = vl6180_read_word(data->client, VL6180_ALS_IT);
if (ret < 0)
return ret;
*val = 0; /* 1 count = 1ms (0 = 1ms) */
*val2 = (ret + 1) * 1000; /* convert to seconds */
*val = data->als_it_ms;
*val2 = 1000;
return IIO_VAL_FRACTIONAL;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_LIGHT:
@ -401,6 +400,9 @@ static int vl6180_set_it(struct vl6180_data *data, int val, int val2)
ret = vl6180_write_word(data->client, VL6180_ALS_IT, it_ms - 1);
if (ret >= 0)
data->als_it_ms = it_ms;
fail:
vl6180_hold(data, false);
mutex_unlock(&data->lock);
@ -470,6 +472,7 @@ static int vl6180_init(struct vl6180_data *data)
return ret;
/* ALS integration time: 100ms */
data->als_it_ms = 100;
ret = vl6180_write_word(client, VL6180_ALS_IT, VL6180_ALS_IT_100);
if (ret < 0)
return ret;