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iio: health: max30102: Add power enable parameter to get_temp function

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Chip must not be in shutdown for reading temperature, so briefly leave
shutdown if buffer is not already running

Signed-off-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Peter Meerwald-Stadler 2017-10-27 21:45:38 +02:00 committed by Jonathan Cameron
parent 839a74cde7
commit a9c47abbdd
1 changed files with 23 additions and 13 deletions
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36
drivers/iio/health/max30102.c
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@ -321,20 +321,31 @@ static int max30102_read_temp(struct max30102_data *data, int *val)
return 0;
}
static int max30102_get_temp(struct max30102_data *data, int *val)
static int max30102_get_temp(struct max30102_data *data, int *val, bool en)
{
int ret;
if (en) {
ret = max30102_set_powermode(data, true);
if (ret)
return ret;
}
/* start acquisition */
ret = regmap_update_bits(data->regmap, MAX30102_REG_TEMP_CONFIG,
MAX30102_REG_TEMP_CONFIG_TEMP_EN,
MAX30102_REG_TEMP_CONFIG_TEMP_EN);
if (ret)
return ret;
goto out;
msleep(35);
ret = max30102_read_temp(data, val);
return max30102_read_temp(data, val);
out:
if (en)
max30102_set_powermode(data, false);
return ret;
}
static int max30102_read_raw(struct iio_dev *indio_dev,
@ -347,20 +358,19 @@ static int max30102_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
/*
* Temperature reading can only be acquired while engine
* is running
* Temperature reading can only be acquired when not in
* shutdown; leave shutdown briefly when buffer not running
*/
mutex_lock(&indio_dev->mlock);
if (!iio_buffer_enabled(indio_dev))
ret = -EBUSY;
else {
ret = max30102_get_temp(data, val);
if (!ret)
ret = IIO_VAL_INT;
}
ret = max30102_get_temp(data, val, true);
else
ret = max30102_get_temp(data, val, false);
mutex_unlock(&indio_dev->mlock);
if (ret)
return ret;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = 1; /* 0.0625 */