HID: waltop: Extend barrel button fix

Extend Waltop barrel button fix to all models: ignore reported pressure when a
barrel button is pressed, because it is rarely correct. Report zero pressure in
such cases instead.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-waltop.c b/drivers/hid/hid-waltop.c
index 9a48438..745e4e9 100644 (file)
--- a/drivers/hid/hid-waltop.c
+++ b/drivers/hid/hid-waltop.c
@@ -638,28 +638,10 @@ static __u8 sirius_battery_free_tablet_rdesc_fixed[] = {
        0xC0                /*  End Collection                      */
 };
 
-struct waltop_state {
-       u8 pressure0;
-       u8 pressure1;
-};
-
 static int waltop_probe(struct hid_device *hdev,
                        const struct hid_device_id *id)
 {
        int ret;
-       struct waltop_state *s;
-
-       s = kzalloc(sizeof(*s), GFP_KERNEL);
-       if (s == NULL) {
-               hid_err(hdev, "can't allocate device state\n");
-               ret = -ENOMEM;
-               goto err;
-       }
-
-       s->pressure0 = 0;
-       s->pressure1 = 0;
-
-       hid_set_drvdata(hdev, s);
 
        ret = hid_parse(hdev);
        if (ret) {
@@ -675,7 +657,6 @@ static int waltop_probe(struct hid_device *hdev,
 
        return 0;
 err:
-       kfree(s);
        return ret;
 }
 
@@ -732,27 +713,18 @@ static __u8 *waltop_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 static int waltop_raw_event(struct hid_device *hdev, struct hid_report *report,
                     u8 *data, int size)
 {
-       /* If this is a pen input report of a tablet with PID 0038 */
-       if (hdev->product == USB_DEVICE_ID_WALTOP_PID_0038 &&
-           report->type == HID_INPUT_REPORT &&
-           report->id == 16 &&
-           size == 8) {
-               struct waltop_state *s = hid_get_drvdata(hdev);
-
+       /* If this is a pen input report */
+       if (report->type == HID_INPUT_REPORT && report->id == 16 && size >= 8) {
                /*
-                * Ignore maximum pressure reported when a barrel button is
-                * pressed.
+                * Ignore reported pressure when a barrel button is pressed,
+                * because it is rarely correct.
                 */
 
                /* If a barrel button is pressed */
                if ((data[1] & 0xF) > 1) {
-                       /* Use the last known pressure */
-                       data[6] = s->pressure0;
-                       data[7] = s->pressure1;
-               } else {
-                       /* Remember reported pressure */
-                       s->pressure0 = data[6];
-                       s->pressure1 = data[7];
+                       /* Report zero pressure */
+                       data[6] = 0;
+                       data[7] = 0;
                }
        }
 
@@ -806,10 +778,7 @@ static int waltop_raw_event(struct hid_device *hdev, struct hid_report *report,
 
 static void waltop_remove(struct hid_device *hdev)
 {
-       struct waltop_state *s = hid_get_drvdata(hdev);
-
        hid_hw_stop(hdev);
-       kfree(s);
 }
 
 static const struct hid_device_id waltop_devices[] = {