Input: wm9713 - support five wire panels

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 22 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;