[PATCH 4/4] wm9713: Support five wire panels

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 drivers/input/touchscreen/wm9713.c |   22 ++++++++++++++++++++++
 include/linux/wm97xx.h             |    1 +
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/drivers/input/touchscreen/wm9713.c b/drivers/input/touchscreen/wm9713.c
index 01278bd..8384587 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 4d13732..6f69968 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 */
-- 
1.5.5.1