--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/drivers/drv_app/fchg/fchg_convert_mA.c	Thu Apr 29 05:13:09 2021 +0000
@@ -0,0 +1,27 @@
+/*
+ * This module implements the fchg_convert_ichg_to_mA() function,
+ * converting charging current (Ichg) measurements from ADC units
+ * to human-friendly mA numbers.  In the phone hardware this current
+ * measurement is made with the aid of a current measurement resistor
+ * placed in the charging current path (the Iota chip's MADC actually
+ * measures the voltage across this resistor, between VCCS and VBATS
+ * terminals), and it just so happens that different phone designers
+ * have chosen different values for this current measurement resistor:
+ * Pirelli DP-L10 uses 0.20R, following TI's canon, whereas Mot C1xx
+ * phones use 0.15R.  Because of these different resistor values,
+ * the formula for converting ADC units to mA becomes target-dependent.
+ */
+
+#include "fchg/fchg_api.h"
+#include "fc-target.h"
+
+UINT16 fchg_convert_ichg_to_mA(UINT16 ichg)
+{
+#ifdef CONFIG_TARGET_COMPAL
+	/* formula for 0.15R */
+	return (ichg * 875 / 768);
+#else
+	/* formula for 0.20R */
+	return (ichg * 875 / 1024);
+#endif
+}