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authorJason Gerecke <killertofu@gmail.com>2012-10-03 17:19:11 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-10-03 23:58:15 -0700
commit4e90495498cc6f1aa15e7667a695908860938b3e (patch)
treebe5df2824e3bff577e4d56b368f6c070e040d891 /drivers/input
parent7774036808011ceecc88cef01dfafcce39ed9fc5 (diff)
Input: wacom - report correct touch contact size for I5/Bamboo
This changes how the touch packets for Intuos5 and 3rd-gen Bamboo are interpreted, so that proper values for the MAJOR and MINOR axes are reported. Instead of using the amplitude field (data[6]), we use the size field (data[5]) and do some calculation to transform it from a scaled-down area into axis lengths. Note that even though we assume a circular contact, both MAJOR and MINOR are reported since the resolution of the X and Y axes differ. Signed-off-by: Jason Gerecke <killertofu@gmail.com> Reviewed-by: Chris Bagwell <chris@cnpbagwell.com> Acked-by: Ping Cheng <pingc@wacom.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/tablet/wacom_wac.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index 2a81ce375f75..ea4068b4490b 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -25,6 +25,11 @@
#define WACOM_INTUOS_RES 100
#define WACOM_INTUOS3_RES 200
+/* Scale factor relating reported contact size to logical contact area.
+ * 2^14/pi is a good approximation on Intuos5 and 3rd-gen Bamboo
+ */
+#define WACOM_CONTACT_AREA_SCALE 2607
+
static int wacom_penpartner_irq(struct wacom_wac *wacom)
{
unsigned char *data = wacom->data;
@@ -1043,11 +1048,19 @@ static void wacom_bpt3_touch_msg(struct wacom_wac *wacom, unsigned char *data)
if (touch) {
int x = (data[2] << 4) | (data[4] >> 4);
int y = (data[3] << 4) | (data[4] & 0x0f);
- int w = data[6];
+ int a = data[5];
+
+ // "a" is a scaled-down area which we assume is roughly
+ // circular and which can be described as: a=(pi*r^2)/C.
+ int x_res = input_abs_get_res(input, ABS_X);
+ int y_res = input_abs_get_res(input, ABS_Y);
+ int width = 2 * int_sqrt(a * WACOM_CONTACT_AREA_SCALE);
+ int height = width * y_res / x_res;
input_report_abs(input, ABS_MT_POSITION_X, x);
input_report_abs(input, ABS_MT_POSITION_Y, y);
- input_report_abs(input, ABS_MT_TOUCH_MAJOR, w);
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, width);
+ input_report_abs(input, ABS_MT_TOUCH_MINOR, height);
}
}
@@ -1533,7 +1546,9 @@ int wacom_setup_input_capabilities(struct input_dev *input_dev,
input_mt_init_slots(input_dev, features->touch_max, 0);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
- 0, 255, 0, 0);
+ 0, features->x_max, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
+ 0, features->y_max, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, features->x_max,
@@ -1641,7 +1656,10 @@ int wacom_setup_input_capabilities(struct input_dev *input_dev,
input_set_abs_params(input_dev,
ABS_MT_TOUCH_MAJOR,
- 0, 255, 0, 0);
+ 0, features->x_max, 0, 0);
+ input_set_abs_params(input_dev,
+ ABS_MT_TOUCH_MINOR,
+ 0, features->y_max, 0, 0);
}
input_set_abs_params(input_dev, ABS_MT_POSITION_X,