[PATCH 2/2] HID: wacom: Add reporting of wheel for Intuos4 WL

[Przemo Firszt <przemo@xxxxxxxxx>]

This patch adds reporting of ABS_WHEEL event. Raported walues are 0..71
and are related to absolute location of the finger on the wheel.

Signed-off-by: Przemo Firszt <przemo@xxxxxxxxx>
---
 drivers/hid/hid-wacom.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
index 5c25036..6f65514 100644
--- a/drivers/hid/hid-wacom.c
+++ b/drivers/hid/hid-wacom.c
@@ -36,6 +36,7 @@
 struct wacom_data {
 	__u16 tool;
 	__u16 butstate;
+	__u8 whlstate;
 	__u8 features;
 	__u32 id;
 	__u32 serial;
@@ -322,6 +323,16 @@ static void wacom_i4_parse_button_report(struct wacom_data *wdata,
 			struct input_dev *input, unsigned char *data)
 {
 	__u16 new_butstate;
+	__u8 new_whlstate;
+	__u8 sync = 0;
+
+	new_whlstate = data[1] & 0x7f;
+	if (new_whlstate != wdata->whlstate) {
+		wdata->whlstate = new_whlstate;
+		input_report_key(input, BTN_TOUCH, 1);
+		input_report_abs(input, ABS_WHEEL, new_whlstate);
+		sync = 1;
+	}
 
 	new_butstate = (data[3] << 1) | (data[2] & 0x01);
 	if (new_butstate != wdata->butstate) {
@@ -335,6 +346,10 @@ static void wacom_i4_parse_button_report(struct wacom_data *wdata,
 		input_report_key(input, BTN_6, new_butstate & 0x040);
 		input_report_key(input, BTN_7, new_butstate & 0x080);
 		input_report_key(input, BTN_8, new_butstate & 0x100);
+		sync = 1;
+	}
+
+	if (sync) {
 		input_report_key(input, BTN_TOOL_FINGER, 1);
 		input_report_abs(input, ABS_MISC, PAD_DEVICE_ID);
 		input_event(input, EV_MSC, MSC_SERIAL, 0xffffffff);
@@ -354,6 +369,7 @@ static void wacom_i4_parse_pen_report(struct wacom_data *wdata,
 		input_report_abs(input, ABS_PRESSURE, 0);
 		input_report_key(input, BTN_STYLUS, 0);
 		input_report_key(input, BTN_STYLUS2, 0);
+		input_report_abs(input, ABS_WHEEL, 0);
 		input_report_key(input, wdata->tool, 0);
 		input_report_abs(input, ABS_MISC, 0);
 		input_event(input, EV_MSC, MSC_SERIAL, wdata->serial);
@@ -512,6 +528,9 @@ static int wacom_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 		input_set_abs_params(input, ABS_DISTANCE, 0, 32, 0, 0);
 		break;
 	case USB_DEVICE_ID_WACOM_INTUOS4_BLUETOOTH:
+		__set_bit(ABS_WHEEL, input->absbit);
+		input_set_abs_params(input, ABS_WHEEL, 0, 71, 0, 0);
+		input_set_capability(input, EV_MSC, MSC_SERIAL);
 		__set_bit(ABS_MISC, input->absbit);
 		__set_bit(BTN_2, input->keybit);
 		__set_bit(BTN_3, input->keybit);
-- 
1.7.6.4

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