+/*
+ * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
+ * verifies success by readinng CTR. Used when testing for presence of AUX
+ * port.
+ */
+static int __devinit i8042_toggle_aux(int on)
+{
+ unsigned char param;
+ int i;
+
+ if (i8042_command(¶m,
+ on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
+ return -1;
+
+ /* some chips need some time to set the I8042_CTR_AUXDIS bit */
+ for (i = 0; i < 100; i++) {
+ udelay(50);
+
+ if (i8042_command(¶m, I8042_CMD_CTL_RCTR))
+ return -1;
+
+ if (!(param & I8042_CTR_AUXDIS) == on)
+ return 0;
+ }
+
+ return -1;
+}