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authorDaniel Drake <dsd@laptop.org>2010-01-07 01:52:39 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-01-07 01:53:30 -0800
commite4e6efd2df4b5754bd519b516207eb723d1f17df (patch)
tree26bef82f6bafcbd824cac6cd5896241cb2527e66 /drivers/input/mouse/psmouse-base.c
parent6f2701b79f2ee0c5eb946e8a87993acbe8041da3 (diff)
downloadtalos-obmc-linux-e4e6efd2df4b5754bd519b516207eb723d1f17df.tar.gz
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Input: psmouse - fix Synaptics detection when protocol is disabled
For configurations where Synaptics hardware is present but the Synaptics extensions support is not compiled in, the mouse is reprobed and a new device is allocated on every suspend/resume. During probe, psmouse_switch_protocol() calls psmouse_extensions() with set_properties=1. This calls the dummy synaptics_init() which returns an error code, instructing us not to use the synaptics extensions. During resume, psmouse_reconnect() calls psmouse_extensions() with set_properties=0, in which case call to synaptics_init() is bypassed and PSMOUSE_SYNAPTICS is returned. Since the result is different from previous attempt psmouse_reconnect() fails and full re-probe happens. Fix this by tweaking the set_properties=0 codepath in psmouse_extensions() to be more careful about offering PSMOUSE_SYNAPTICS extensions. Signed-off-by: Daniel Drake <dsd@laptop.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/mouse/psmouse-base.c')
-rw-r--r--drivers/input/mouse/psmouse-base.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index d59e18b24ede..cabf4e1caacc 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -627,8 +627,15 @@ static int psmouse_extensions(struct psmouse *psmouse,
synaptics_hardware = true;
if (max_proto > PSMOUSE_IMEX) {
- if (!set_properties || synaptics_init(psmouse) == 0)
+/*
+ * Try activating protocol, but check if support is enabled first, since
+ * we try detecting Synaptics even when protocol is disabled.
+ */
+ if (synaptics_supported() &&
+ (!set_properties || synaptics_init(psmouse) == 0)) {
return PSMOUSE_SYNAPTICS;
+ }
+
/*
* Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
* Unfortunately Logitech/Genius probes confuse some firmware versions so
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