From: David Herrmann Date: Tue, 8 May 2012 14:52:31 +0000 (+0200) Subject: HID: wiimote: Fix IR data parser X-Git-Tag: v3.2.19~67 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3179153afbc6bd7ccc8c3044d5fb3a9a366736c9;p=thirdparty%2Fkernel%2Fstable.git HID: wiimote: Fix IR data parser commit 74b89e8a3625c17c7452532dfb997ac4f1a38751 upstream. We incorrectly parse incoming IR data. The extra byte contains the upper bits and not the lower bits of the x/y coordinates. User-space expects absolute position data from us so this patch does not break existing applications. On the contrary, it extends the virtual view and fixes garbage reports for margin areas of the virtual screen. Reported-by: Peter Bukovsky Signed-off-by: David Herrmann Signed-off-by: Jiri Kosina [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings --- diff --git a/drivers/hid/hid-wiimote.c b/drivers/hid/hid-wiimote.c index 76739c07fa3c8..bfa9a27272a6b 100644 --- a/drivers/hid/hid-wiimote.c +++ b/drivers/hid/hid-wiimote.c @@ -829,7 +829,7 @@ static void __ir_to_input(struct wiimote_data *wdata, const __u8 *ir, /* * Basic IR data is encoded into 3 bytes. The first two bytes are the - * upper 8 bit of the X/Y data, the 3rd byte contains the lower 2 bits + * lower 8 bit of the X/Y data, the 3rd byte contains the upper 2 bits * of both. * If data is packed, then the 3rd byte is put first and slightly * reordered. This allows to interleave packed and non-packed data to @@ -838,17 +838,11 @@ static void __ir_to_input(struct wiimote_data *wdata, const __u8 *ir, */ if (packed) { - x = ir[1] << 2; - y = ir[2] << 2; - - x |= ir[0] & 0x3; - y |= (ir[0] >> 2) & 0x3; + x = ir[1] | ((ir[0] & 0x03) << 8); + y = ir[2] | ((ir[0] & 0x0c) << 6); } else { - x = ir[0] << 2; - y = ir[1] << 2; - - x |= (ir[2] >> 4) & 0x3; - y |= (ir[2] >> 6) & 0x3; + x = ir[0] | ((ir[2] & 0x30) << 4); + y = ir[1] | ((ir[2] & 0xc0) << 2); } input_report_abs(wdata->ir, xid, x);