diff options
| author | Gwendal Grignou <gwendal@chromium.org> | 2015-08-31 11:12:32 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2015-09-01 01:28:00 -0700 |
| commit | 1dfaf92f3a440456b4fc796b2f7a134fd4b83a19 (patch) | |
| tree | 43149e7127cb11deabeacc4f566020739586e496 /driver/als_si114x.c | |
| parent | c2cf0fb198feea043a331e5d2156979d23f1aa46 (diff) | |
| download | chrome-ec-1dfaf92f3a440456b4fc796b2f7a134fd4b83a19.tar.gz | |
driver: si114x: Convert unit to distance
Instead of returning the amount of light returned,
convert the data into distance (cm). It can be adjust via range.
BRANCH=smaug
BUG=chrome-os-partner:42526
TEST=check the data is usable by HAL.
Change-Id: I97510246ce054af4e61325d7e295ca09cc536457
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/296472
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Diffstat (limited to 'driver/als_si114x.c')
| -rw-r--r-- | driver/als_si114x.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/driver/als_si114x.c b/driver/als_si114x.c index 3be0c68d67..1ddb098ce9 100644 --- a/driver/als_si114x.c +++ b/driver/als_si114x.c @@ -93,10 +93,17 @@ static int si114x_read_results(struct motion_sensor_t *s, int nb) if (ret) break; /* Add offset, calibration */ - if (val + type_data->offset < 0) { - val = 0; + if (val + type_data->offset <= 0) { + val = 1; } else { val += type_data->offset; + /* + * Proxmitiy sensor data is inverse of the distance. + * Return back something proportional to distance, + * we affine with the scale parmeter. + */ + if (s->type == MOTIONSENSE_TYPE_PROX) + val = SI114X_PS_INVERSION(val); val = val * type_data->scale + val * type_data->uscale / 10000; } |