linux-kernel - About "HID: logitech-hidpp: add support of the first Logitech Wireless Touchpad"

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Date:	Thu, 11 Dec 2014 11:02:20 +0100
From:	Peter Wu <peter@...ensteyn.nl>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew de los Reyes <adlr@...omium.org>,
	Jiri Kosina <jkosina@...e.cz>
Subject: About "HID: logitech-hidpp: add support of the first Logitech Wireless Touchpad"

Hi Benjamin,

In commit 57ac86cf52e903d9e3e0f12b34c814cce6b65550 ("HID:
logitech-hidpp: add support of the first Logitech Wireless Touchpad")
which is in jikos/hid, you made this change to wtp_raw_event:

        switch (data[0]) {
        case 0x02:
-               if (size < 21)
-                       return 1;
-               return wtp_mouse_raw_xy_event(hidpp, &data[7]);
+               if (hidpp->quirks & HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS) {
+                       input_event(wd->input, EV_KEY, BTN_LEFT,
+                                       !!(data[1] & 0x01));
+                       input_event(wd->input, EV_KEY, BTN_RIGHT,
+                                       !!(data[1] & 0x02));
+                       input_sync(wd->input);
+               } else {
+                       if (size < 21)
+                               return 1;
+                       return wtp_mouse_raw_xy_event(hidpp, &data[7]);
+               }
        case REPORT_ID_HIDPP_LONG:
                if ((report->fap.feature_index != wd->mt_feature_index) ||
                    (report->fap.funcindex_clientid != EVENT_TOUCHPAD_RAW_XY))
                        return 1;
                hidpp_touchpad_raw_xy_event(hidpp, data + 4, &raw);
 
                wtp_send_raw_xy_event(hidpp, &raw);
                return 0;
        }

Report ID 2 is the mouse descriptor, so it seems correct in that it
falls-through to the next case, but I wanted to check with you that this
is indeed your intention. If so, could you explicitly mark it with a
comment, /* fallthrough */ ?
-- 
Kind regards,
Peter
https://lekensteyn.nl

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