3 files changed, 14 insertions, 2 deletions

diff --git a/drivers/input/touchscreen/mainstone-wm97xx.c b/drivers/input/touchscreen/mainstone-wm97xx.c
index c797bc04ee83..8fc3b08deb3b 100644
--- a/drivers/input/touchscreen/mainstone-wm97xx.c
+++ b/drivers/input/touchscreen/mainstone-wm97xx.c
@@ -198,6 +198,9 @@ static int wm97xx_acc_startup(struct wm97xx *wm)
         if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) {
                 pen_int = 1;
                 irq = 27;
+                /* There is some obscure mutant of WM9712 interbred with WM9713
+                 * used on Palm HW */
+                wm->variant = WM97xx_WM1613;
         } else if (machine_is_mainstone() && pen_int)
                 irq = 4;
 
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index 2957d48e0045..252eb11fe9db 100644
--- a/drivers/input/touchscreen/wm97xx-core.c
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -204,7 +204,7 @@ void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
         else
                 reg &= ~gpio;
 
-        if (wm->id == WM9712_ID2)
+        if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
         else
                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
@@ -307,7 +307,7 @@ static void wm97xx_pen_irq_worker(struct work_struct *work)
                                          WM97XX_GPIO_13);
                 }
 
-                if (wm->id == WM9712_ID2)
+                if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
                                                 ~WM97XX_GPIO_13) << 1);
                 else
@@ -582,6 +582,8 @@ static int wm97xx_probe(struct device *dev)
 
         wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
 
+        wm->variant = WM97xx_GENERIC;
+
         dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
 
         switch (wm->id & 0xff) {
diff --git a/include/linux/wm97xx.h b/include/linux/wm97xx.h
index 6f69968eab24..0c9878123d5f 100644
--- a/include/linux/wm97xx.h
+++ b/include/linux/wm97xx.h
@@ -16,6 +16,12 @@
 #include <linux/platform_device.h>
 
 /*
+ * WM97xx variants
+ */
+#define WM97xx_GENERIC                  0x0000
+#define WM97xx_WM1613                   0x1613
+
+/*
  * WM97xx AC97 Touchscreen registers
  */
 #define AC97_WM97XX_DIGITISER1          0x76
@@ -283,6 +289,7 @@ struct wm97xx {
         unsigned pen_is_down:1;         /* Pen is down */
         unsigned aux_waiting:1;         /* aux measurement waiting */
         unsigned pen_probably_down:1;   /* used in polling mode */
+        u16 variant;                    /* WM97xx chip variant */
         u16 suspend_mode;               /* PRP in suspend mode */
 };