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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2010-05-19 10:11:13 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-05-19 10:15:13 -0700
commita083632eaf6231162b33e40561cfec6a9c156945 (patch)
treea063886c624edbb204eb6e87d046f67bb89a2e4d /drivers/input
parentd4ae84a84bedcb79341887ff070e6528d1374663 (diff)
downloadlinux-a083632eaf6231162b33e40561cfec6a9c156945.tar.bz2
Input: elantech - relax signature checks
Apparently there are Elantech touchpads that report non-zero in the 2nd byte of their signature. Adjust the detection routine so that if 2nd byte is zero and 3rd byte contains value that is not a valid report rate, we still assume that signature is valid. Tested-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/mouse/elantech.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 232556a89c4a..b18862b2a70e 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -575,6 +575,24 @@ static struct attribute_group elantech_attr_group = {
.attrs = elantech_attrs,
};
+static bool elantech_is_signature_valid(const unsigned char *param)
+{
+ static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
+ int i;
+
+ if (param[0] == 0)
+ return false;
+
+ if (param[1] == 0)
+ return true;
+
+ for (i = 0; i < ARRAY_SIZE(rates); i++)
+ if (param[2] == rates[i])
+ return false;
+
+ return true;
+}
+
/*
* Use magic knock to detect Elantech touchpad
*/
@@ -617,7 +635,7 @@ int elantech_detect(struct psmouse *psmouse, bool set_properties)
pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
param[0], param[1], param[2]);
- if (param[0] == 0 || param[1] != 0) {
+ if (!elantech_is_signature_valid(param)) {
if (!force_elantech) {
pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
return -1;