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authorStefan Kriwanek <dev@stefankriwanek.de>2013-08-25 10:46:13 +0200
committerJiri Kosina <jkosina@suse.cz>2013-08-26 13:51:10 +0200
commit06bb5219118fb098f4b0c7dcb484b28a52bf1c14 (patch)
tree6ae95720c0fba81e0b40326cfab5708e7f8b0579 /drivers/hid/hid-speedlink.c
parent15261f6d8d032b30f6eb7dbf1dbb9e4095df84c0 (diff)
downloadlinux-06bb5219118fb098f4b0c7dcb484b28a52bf1c14.tar.bz2
HID: Fix Speedlink VAD Cezanne support for some devices
Some devices of the "Speedlink VAD Cezanne" model need more aggressive fixing than already done. I made sure through testing that this patch would not interfere with the proper working of a device that is bug-free. (The driver drops EV_REL events with abs(val) >= 256, which are not achievable even on the highest laser resolution hardware setting.) Signed-off-by: Stefan Kriwanek <mail@stefankriwanek.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-speedlink.c')
-rw-r--r--drivers/hid/hid-speedlink.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/hid/hid-speedlink.c b/drivers/hid/hid-speedlink.c
index a2f587d004e1..7112f3e832ee 100644
--- a/drivers/hid/hid-speedlink.c
+++ b/drivers/hid/hid-speedlink.c
@@ -3,7 +3,7 @@
* Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from
* the HID descriptor.
*
- * Copyright (c) 2011 Stefan Kriwanek <mail@stefankriwanek.de>
+ * Copyright (c) 2011, 2013 Stefan Kriwanek <dev@stefankriwanek.de>
*/
/*
@@ -46,8 +46,13 @@ static int speedlink_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
/* No other conditions due to usage_table. */
- /* Fix "jumpy" cursor (invalid events sent by device). */
- if (value == 256)
+
+ /* This fixes the "jumpy" cursor occuring due to invalid events sent
+ * by the device. Some devices only send them with value==+256, others
+ * don't. However, catching abs(value)>=256 is restrictive enough not
+ * to interfere with devices that were bug-free (has been tested).
+ */
+ if (abs(value) >= 256)
return 1;
/* Drop useless distance 0 events (on button clicks etc.) as well */
if (value == 0)