diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2014-04-19 03:22:00 +0400 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-05-05 13:59:45 +0400 |
| commit | 9030924510a9e7d4b7d218749533840075879f2f (patch) | |
| tree | 52edcc0477c21fed5c1976199c9786e52828cf4d /drivers/iio | |
| parent | 5d02edfc3957446fd625c0b018e14c6631a791f4 (diff) | |
| download | linux-9030924510a9e7d4b7d218749533840075879f2f.tar.xz | |
iio: hid-sensors: Add api to get poll value
Added interface to get poll value in milli-seconds. This value is
changed by changing sampling frequency. This API allows clients
to wait for at least some poll milli seconds before reading a new sample.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/common/hid-sensors/hid-sensor-attributes.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c index e61b1faa1e06..372964635ccf 100644 --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c @@ -147,6 +147,26 @@ static u32 convert_to_vtf_format(int size, int exp, int val1, int val2) return value; } +s32 hid_sensor_read_poll_value(struct hid_sensor_common *st) +{ + s32 value = 0; + int ret; + + ret = sensor_hub_get_feature(st->hsdev, + st->poll.report_id, + st->poll.index, &value); + + if (ret < 0 || value < 0) { + return -EINVAL; + } else { + if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND) + value = value * 1000; + } + + return value; +} +EXPORT_SYMBOL(hid_sensor_read_poll_value); + int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st, int *val1, int *val2) { |