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authorPeter Meerwald-Stadler <pmeerw@pmeerw.net>2017-10-27 22:45:38 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2017-12-02 13:40:55 +0300
commita9c47abbdd71dceeaf1b923e5ce10e700e036905 (patch)
tree6d95aaa8563ded1415b66c8f66e682710583363a /drivers/iio/health
parent839a74cde7ee6da20ee908a570c0e88970ac13c9 (diff)
downloadlinux-a9c47abbdd71dceeaf1b923e5ce10e700e036905.tar.xz
iio: health: max30102: Add power enable parameter to get_temp function
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>
Diffstat (limited to 'drivers/iio/health')
-rw-r--r--drivers/iio/health/max30102.c36
1 files changed, 23 insertions, 13 deletions
diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c
index 6c395c8c2326..dc4d04b5f291 100644
--- a/drivers/iio/health/max30102.c
+++ b/drivers/iio/health/max30102.c
@@ -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);
+
+out:
+ if (en)
+ max30102_set_powermode(data, false);
- return max30102_read_temp(data, val);
+ 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 */