HID: wacom: Add pad buttons reporting on Intuos4 WL

This patch adds reporting of 1 wheel button and 8 strip buttons for Intuos4 WL.
The buttons are reported as BTN_0 to BTN_9. The change of type butstate variable
is required as the old type 'char' couldn't store state of 9 buttons. The change
is not affecting Graphire tablet as it only uses first 2 bits of 'butstate'.

Signed-off-by: Przemo Firszt <przemo@firszt.eu>
Acked-by：Ping Cheng <pinglinux@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 35 insertions, 1 deletions

diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
index 5a58db2440fa..58aedbc80f02 100644
--- a/drivers/hid/hid-wacom.c
+++ b/drivers/hid/hid-wacom.c
@@ -31,9 +31,11 @@
 
 #include "hid-ids.h"
 
+#define PAD_DEVICE_ID   0x0F
+
 struct wacom_data {
         __u16 tool;
-        unsigned char butstate;
+        __u16 butstate;
         __u8 features;
         __u32 id;
         __u32 serial;
@@ -316,6 +318,30 @@ static int wacom_gr_parse_report(struct hid_device *hdev,
         return 1;
 }
 
+static void wacom_i4_parse_button_report(struct wacom_data *wdata,
+                        struct input_dev *input, unsigned char *data)
+{
+        __u16 new_butstate;
+
+        new_butstate = (data[3] << 1) | (data[2] & 0x01);
+        if (new_butstate != wdata->butstate) {
+                wdata->butstate = new_butstate;
+                input_report_key(input, BTN_0, new_butstate & 0x001);
+                input_report_key(input, BTN_1, new_butstate & 0x002);
+                input_report_key(input, BTN_2, new_butstate & 0x004);
+                input_report_key(input, BTN_3, new_butstate & 0x008);
+                input_report_key(input, BTN_4, new_butstate & 0x010);
+                input_report_key(input, BTN_5, new_butstate & 0x020);
+                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);
+                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);
+                input_sync(input);
+        }
+}
+
 static void wacom_i4_parse_pen_report(struct wacom_data *wdata,
                         struct input_dev *input, unsigned char *data)
 {
@@ -389,6 +415,7 @@ static void wacom_i4_parse_report(struct hid_device *hdev,
                 wdata->features = data[2];
                 break;
         case 0x0C: /* Button report */
+                wacom_i4_parse_button_report(wdata, input, data);
                 break;
         default:
                 hid_err(hdev, "Unknown report: %d,%d\n", data[0], data[1]);
@@ -484,6 +511,13 @@ static int wacom_input_mapped(struct hid_device *hdev, struct hid_input *hi,
                 break;
         case USB_DEVICE_ID_WACOM_INTUOS4_BLUETOOTH:
                 __set_bit(ABS_MISC, input->absbit);
+                __set_bit(BTN_2, input->keybit);
+                __set_bit(BTN_3, input->keybit);
+                __set_bit(BTN_4, input->keybit);
+                __set_bit(BTN_5, input->keybit);
+                __set_bit(BTN_6, input->keybit);
+                __set_bit(BTN_7, input->keybit);
+                __set_bit(BTN_8, input->keybit);
                 input_set_abs_params(input, ABS_X, 0, 40640, 4, 0);
                 input_set_abs_params(input, ABS_Y, 0, 25400, 4, 0);
                 input_set_abs_params(input, ABS_PRESSURE, 0, 2047, 0, 0);