2 files changed, 23 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/wm9713.c b/drivers/input/touchscreen/wm9713.c
index 01278bd7e65c..838458792ea0 100644
--- a/drivers/input/touchscreen/wm9713.c
+++ b/drivers/input/touchscreen/wm9713.c
@@ -85,6 +85,15 @@ module_param(delay, int, 0);
 MODULE_PARM_DESC(delay, "Set adc sample delay.");
 
 /*
+ * Set five_wire = 1 to use a 5 wire touchscreen.
+ *
+ * NOTE: Five wire mode does not allow for readback of pressure.
+ */
+static int five_wire;
+module_param(five_wire, int, 0);
+MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
+
+/*
  * Set adc mask function.
  *
  * Sources of glitch noise, such as signals driving an LCD display, may feed
@@ -162,6 +171,19 @@ static void wm9713_phy_init(struct wm97xx *wm)
                          64000 / rpu);
         }
 
+        /* Five wire panel? */
+        if (five_wire) {
+                dig3 |= WM9713_45W;
+                dev_info(wm->dev, "setting 5-wire touchscreen mode.");
+
+                if (pil) {
+                        dev_warn(wm->dev,
+                                 "Pressure measurement not supported in 5 "
+                                 "wire mode, disabling\n");
+                        pil = 0;
+                }
+        }
+
         /* touchpanel pressure */
         if (pil == 2) {
                 dig3 |= WM9712_PIL;
diff --git a/include/linux/wm97xx.h b/include/linux/wm97xx.h
index 4d13732e9cf0..6f69968eab24 100644
--- a/include/linux/wm97xx.h
+++ b/include/linux/wm97xx.h
@@ -100,6 +100,7 @@
 #define WM9713_ADCSEL_Y         0x0004  /* Y measurement */
 #define WM9713_ADCSEL_PRES      0x0008  /* Pressure measurement */
 #define WM9713_COO              0x0001  /* enable coordinate mode */
+#define WM9713_45W              0x1000  /* set for 5 wire panel */
 #define WM9713_PDEN             0x0800  /* measure only when pen down */
 #define WM9713_ADCSEL_MASK      0x00fe  /* ADC selection mask */
 #define WM9713_WAIT             0x0200  /* coordinate wait */