+ if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts")) {
+ /* Allwinner SDK has temperature = -271 + (value / 6) (C) */
+ ts->temp_offset = 1626;
+ ts->temp_step = 167;
+ } else {
+ /*
+ * The user manuals do not contain the formula for calculating
+ * the temperature. The formula used here is from the AXP209,
+ * which is designed by X-Powers, an affiliate of Allwinner:
+ *
+ * temperature = -144.7 + (value * 0.1)
+ *
+ * Allwinner does not have any documentation whatsoever for
+ * this hardware. Moreover, it is claimed that the sensor
+ * is inaccurate and cannot work properly.
+ */
+ ts->temp_offset = 1447;
+ ts->temp_step = 100;
+ }