diff options
Diffstat (limited to 'driver/touchpad_elan.c')
| -rw-r--r-- | driver/touchpad_elan.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/driver/touchpad_elan.c b/driver/touchpad_elan.c index 06bae3dcba..0610631d18 100644 --- a/driver/touchpad_elan.c +++ b/driver/touchpad_elan.c @@ -62,9 +62,10 @@ struct { /* * Report a more reasonable pressure value, so that no adjustment is necessary - * on Chrome OS side. + * on Chrome OS side. 3216/1024 ~= 3.1416. */ -const int pressure_mult = 3; +const int pressure_mult = 3216; +const int pressure_div = 1024; static int elan_tp_read_cmd(uint16_t reg, uint16_t *val) { @@ -149,10 +150,12 @@ static int elan_tp_read_report(void) int width = (finger[3] & 0xf0) >> 4; int height = finger[3] & 0x0f; int pressure = finger[4] + elan_tp_params.pressure_adj; + pressure = DIV_ROUND_NEAREST(pressure * pressure_mult, + pressure_div); width = MIN(4095, width * elan_tp_params.width_x); height = MIN(4095, height * elan_tp_params.width_y); - pressure = MIN(255, pressure * pressure_mult); + pressure = MIN(255, pressure); report.finger[ri].tip = 1; report.finger[ri].inrange = 1; |