Input: wacom - add fuzz parameters to features

The signal-to-noise ratio varies between devices, but currently all
devices are treated the same way. Add fuzz parameters to the feature
struct, allowing for tailored treatment of devices.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 15 insertions, 4 deletions

diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 42ba3691d908..e510e4fb54f7 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -333,8 +333,12 @@ static int wacom_retrieve_hid_descriptor(struct usb_interface *intf,
         struct usb_host_interface *interface = intf->cur_altsetting;
         struct hid_descriptor *hid_desc;
 
-        /* default device to penabled */
+        /* default features */
         features->device_type = BTN_TOOL_PEN;
+        features->x_fuzz = 4;
+        features->y_fuzz = 4;
+        features->pressure_fuzz = 0;
+        features->distance_fuzz = 0;
 
         /* only Tablet PCs need to retrieve the info */
         if ((features->type != TABLETPC) && (features->type != TABLETPC2FG))
diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index 6e29badb969e..6d7e1647715f 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -951,9 +951,12 @@ void wacom_setup_input_capabilities(struct input_dev *input_dev,
 
         __set_bit(BTN_TOUCH, input_dev->keybit);
 
-        input_set_abs_params(input_dev, ABS_X, 0, features->x_max, 4, 0);
-        input_set_abs_params(input_dev, ABS_Y, 0, features->y_max, 4, 0);
-        input_set_abs_params(input_dev, ABS_PRESSURE, 0, features->pressure_max, 0, 0);
+        input_set_abs_params(input_dev, ABS_X, 0, features->x_max,
+                             features->x_fuzz, 0);
+        input_set_abs_params(input_dev, ABS_Y, 0, features->y_max,
+                             features->y_fuzz, 0);
+        input_set_abs_params(input_dev, ABS_PRESSURE, 0, features->pressure_max,
+                             features->pressure_fuzz, 0);
 
         __set_bit(ABS_MISC, input_dev->absbit);
 
diff --git a/drivers/input/tablet/wacom_wac.h b/drivers/input/tablet/wacom_wac.h
index 99e1a54cd305..d769e9aa6f10 100644
--- a/drivers/input/tablet/wacom_wac.h
+++ b/drivers/input/tablet/wacom_wac.h
@@ -73,6 +73,10 @@ struct wacom_features {
         int y_phy;
         unsigned char unit;
         unsigned char unitExpo;
+        int x_fuzz;
+        int y_fuzz;
+        int pressure_fuzz;
+        int distance_fuzz;
 };
 
 struct wacom_shared {