From: Arjan Opmeer <arjan@xxxxxxxxxx>
Some Logitech mice react to the magic knock like an Elantech touchpad would.
This leads to those mice being misdetected as Elantech touchpads. Add a
version query to elantech_detect() to distinguish the two.
Signed-off-by: Arjan Opmeer <arjan@xxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Cc: Dmitry Torokhov <dtor@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/input/mouse/elantech.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
diff -puN drivers/input/mouse/elantech.c~input-elantech-touchpad-driver-miss-recognising-logitech-mice drivers/input/mouse/elantech.c
--- a/drivers/input/mouse/elantech.c~input-elantech-touchpad-driver-miss-recognising-logitech-mice
+++ a/drivers/input/mouse/elantech.c
@@ -556,6 +556,22 @@ int elantech_detect(struct psmouse *psmo
return -1;
}
+ /*
+ * There are Logitech mice that react to the magic knock exactly
+ * like an Elantech touchpad would, so do a version query here to
+ * try to distinguish the two
+ */
+ if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
+ pr_err("elantech.c: failed to query firmware version.\n");
+ return -1;
+ }
+ pr_info("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
+ param[0], param[1], param[2]);
+ if (param[0] == 0 || param[1] != 0) {
+ pr_info("elantech.c: Probably not a real Elantech touchpad. Aborting.\n");
+ return -1;
+ }
+
if (set_properties) {
psmouse->vendor = "Elantech";
psmouse->name = "Touchpad";
@@ -610,14 +626,12 @@ int elantech_init(struct psmouse *psmous
etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
/*
- * Find out what version hardware this is
+ * Do the version query again so we can store the result
*/
if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
pr_err("elantech.c: failed to query firmware version.\n");
goto init_fail;
}
- pr_info("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
- param[0], param[1], param[2]);
etd->fw_version_maj = param[0];
etd->fw_version_min = param[2];
_
--
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