[PATCH 06/13] Input: wacom - add a quirk for low resolution Bamboo devices

[Henrik Rydberg]

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 at euromail.se>
Acked-by: Ping Cheng <pingc at wacom.com>
Signed-off-by: Dmitry Torokhov <dtor at mail.ru>
---
 drivers/input/tablet/wacom_wac.c |   10 ++++++++++
 drivers/input/tablet/wacom_wac.h |    1 +
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index 56238d9..619abf5 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -824,6 +824,7 @@ 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;
@@ -838,6 +839,10 @@ 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);
@@ -973,8 +978,13 @@ 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 c90fb7c..1ee0988 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
-- 
1.7.1