Input: wacom - add a quirk for low resolution Bamboo devices

The Bamboo Touch reports a sub-screen resolution of 480x320.  The
signal-to-noise ratio is only about 100, so filtering is needed in
order to reduce the jitter to a usable level. However, the low
resolution leads to round-off errors in the EWMA filter, resulting in
extremely jerky pointer motion. This patch explicitly sets a higher
resolution for those devices, and tells this to the completion handler
via a low-resolution quirk.

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

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index 4e9b1ddf54e9..2f4411aee305 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -857,6 +857,7 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, size_t len)
 
 static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
 {
+        struct wacom_features *features = &wacom->features;
         struct input_dev *input = wacom->input;
         unsigned char *data = wacom->data;
         int sp = 0, sx = 0, sy = 0, count = 0;
@@ -871,6 +872,10 @@ static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
                 if (p) {
                         int x = get_unaligned_be16(&data[9 * i + 3]) & 0x7ff;
                         int y = get_unaligned_be16(&data[9 * i + 5]) & 0x7ff;
+                        if (features->quirks & WACOM_QUIRK_BBTOUCH_LOWRES) {
+                                x <<= 5;
+                                y <<= 5;
+                        }
                         input_report_abs(input, ABS_MT_PRESSURE, p);
                         input_report_abs(input, ABS_MT_POSITION_X, x);
                         input_report_abs(input, ABS_MT_POSITION_Y, y);
@@ -1010,8 +1015,13 @@ void wacom_setup_device_quirks(struct wacom_features *features)
         /* quirks for bamboo touch */
         if (features->type == BAMBOO_PT &&
             features->device_type == BTN_TOOL_TRIPLETAP) {
+                features->x_max <<= 5;
+                features->y_max <<= 5;
+                features->x_fuzz <<= 5;
+                features->y_fuzz <<= 5;
                 features->pressure_max = 256;
                 features->pressure_fuzz = 16;
+                features->quirks |= WACOM_QUIRK_BBTOUCH_LOWRES;
         }
 }
 
diff --git a/drivers/input/tablet/wacom_wac.h b/drivers/input/tablet/wacom_wac.h
index a23d6a5fcc4f..00ca01541d89 100644
--- a/drivers/input/tablet/wacom_wac.h
+++ b/drivers/input/tablet/wacom_wac.h
@@ -40,6 +40,7 @@
 
 /* device quirks */
 #define WACOM_QUIRK_MULTI_INPUT         0x0001
+#define WACOM_QUIRK_BBTOUCH_LOWRES      0x0002
 
 /* largest reported tracking id */
 #define MAX_TRACKING_ID                 0xfff