HID: wacom: Don't set tool type until we're in range

commit 2cc08800a6b9fcda7c7afbcf2da1a6e8808da725 upstream.

The serial number and tool type information that is reported by the tablet
while a pen is merely "in prox" instead of fully "in range" can be stale
and cause us to report incorrect tool information. Serial number, tool
type, and other information is only valid once the pen comes fully in range
so we should be careful to not use this information until that point.

In particular, this issue may cause the driver to incorectly report
BTN_TOOL_RUBBER after switching from the eraser tool back to the pen.

Fixes: a48324de6d4d ("HID: wacom: Bluetooth IRQ for Intuos Pro should handle prox/range")
Cc: <stable@vger.kernel.org> # 4.11+
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 5dd3a8245f0fd5015b02c933b778a3336ed59d19..74a65839a55a73788feb5e29d2b3d95e27be9a69 100644 (file)
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1234,13 +1234,13 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac *wacom)
                /* Add back in missing bits of ID for non-USI pens */
                wacom->id[0] |= (wacom->serial[0] >> 32) & 0xFFFFF;
        }
-       wacom->tool[0]   = wacom_intuos_get_tool_type(wacom_intuos_id_mangle(wacom->id[0]));
 
        for (i = 0; i < pen_frames; i++) {
                unsigned char *frame = &data[i*pen_frame_len + 1];
                bool valid = frame[0] & 0x80;
                bool prox = frame[0] & 0x40;
                bool range = frame[0] & 0x20;
+               bool invert = frame[0] & 0x10;
 
                if (!valid)
                        continue;
@@ -1249,9 +1249,24 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac *wacom)
                        wacom->shared->stylus_in_proximity = false;
                        wacom_exit_report(wacom);
                        input_sync(pen_input);
+
+                       wacom->tool[0] = 0;
+                       wacom->id[0] = 0;
+                       wacom->serial[0] = 0;
                        return;
                }
+
                if (range) {
+                       if (!wacom->tool[0]) { /* first in range */
+                               /* Going into range select tool */
+                               if (invert)
+                                       wacom->tool[0] = BTN_TOOL_RUBBER;
+                               else if (wacom->id[0])
+                                       wacom->tool[0] = wacom_intuos_get_tool_type(wacom->id[0]);
+                               else
+                                       wacom->tool[0] = BTN_TOOL_PEN;
+                       }
+
                        input_report_abs(pen_input, ABS_X, get_unaligned_le16(&frame[1]));
                        input_report_abs(pen_input, ABS_Y, get_unaligned_le16(&frame[3]));