imx51 的 touch calibration

BoardConfig.mk 有定義 TARGET_TS_DEVICE := "mxc_ts"

ts_calibrator 的 Android.mk LOCAL_CFLAGS += -DTS_DEVICE=$(TARGET_TS_DEVICE)

ts_calibrator.c 的 code: #define TS_INPUT_DEV DEV_(TS_DEVICE) ... static const char dev_name[] = TS_INPUT_DEV; ... sprintf(param_path, "/sys/module/%s/parameters/calibration", dev_name); fd = open(param_path, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
所以 touch calibration sysfs 位置 是 : /sys/module/mxc_ts/parameters/calibration

在 kernel 的 mxc_ts driver 有說明 calibration 裡面的數值意義： calibration array refers to (delta_x[0], delta_x[1], delta_x[2], delta_y[0], delta_y[1], delta_y[2], delta). Which generated by calibration service. In this driver when we got touch pointer (x', y') from PMIC ADC, we calculate the display pointer (x,y) by: x = (delta_x[0] * x' + delta_x[1] * y' + delta_x[2]) / delta; y = (delta_y[0] * x' + delta_y[1] * y' + delta_y[2]) / delta;