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Early-generation touchpads do not send periodic calibration frames for

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baseline subtraction, and are very temperature sensitive, so would slowly
drift out of a calibrated state when under load. Escape this by taking
the last frame before we decide that the pad is idle as a finger-free
baseline.

Tested on:	iBook G4
This commit is contained in:
Nathan Whitehorn 2009-11-29 20:48:19 +00:00
parent a77cb332ee
commit d7e7c660b4
1 changed files with 15 additions and 0 deletions
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15
sys/dev/usb/input/atp.c
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@ -1850,6 +1850,21 @@ atp_intr(struct usb_xfer *xfer, usb_error_t error)
sc->sc_idlecount++;
if (sc->sc_idlecount >= ATP_IDLENESS_THRESHOLD) {
DPRINTFN(ATP_LLEVEL_INFO, "idle\n");
/*
* Use the last frame before we go idle for
* calibration on pads which do not send
* calibration frames.
*/
if (sc->sc_params->prot < ATP_PROT_GEYSER3) {
memcpy(sc->base_x, sc->cur_x,
sc->sc_params->n_xsensors *
sizeof(*(sc->base_x)));
memcpy(sc->base_y, sc->cur_y,
sc->sc_params->n_ysensors *
sizeof(*(sc->base_y)));
}
sc->sc_idlecount = 0;
usbd_transfer_start(sc->sc_xfer[ATP_RESET]);
}