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authorAndres Salomon <dilinger@queued.net>2010-12-23 01:19:38 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-12-23 01:21:23 -0800
commitef8313bb1a22e7d2125d9d758aa8a81f1de91d81 (patch)
treea3a182ac683ddf5d8c50218b7076cf44f02e2b47
parent7ee99161a4febe53c906cb9becc596075fd6193e (diff)
downloadop-kernel-dev-ef8313bb1a22e7d2125d9d758aa8a81f1de91d81.zip
op-kernel-dev-ef8313bb1a22e7d2125d9d758aa8a81f1de91d81.tar.gz
Input: psmouse - disable the synaptics extension on OLPC machines
OLPC has switched to a Synaptics touchpad. It turns out that it's pretty useless in absolute mode. This patch looks for an OLPC system (via DMI tables), and refuses to init Synaptics mode in that scenario (falling back to relative mode). Signed-off-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
-rw-r--r--drivers/input/mouse/synaptics.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 53c65a6..a977ef4 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -744,15 +744,45 @@ static const struct dmi_system_id __initconst toshiba_dmi_table[] = {
#endif
};
+static bool broken_olpc_ec;
+
+static const struct dmi_system_id __initconst olpc_dmi_table[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
+ {
+ /* OLPC XO-1 or XO-1.5 */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
+ },
+ },
+ { }
+#endif
+};
+
void __init synaptics_module_init(void)
{
impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
+ broken_olpc_ec = dmi_check_system(olpc_dmi_table);
}
int synaptics_init(struct psmouse *psmouse)
{
struct synaptics_data *priv;
+ /*
+ * The OLPC XO has issues with Synaptics' absolute mode; similarly to
+ * the HGPK, it quickly degrades and the hardware becomes jumpy and
+ * overly sensitive. Not only that, but the constant packet spew
+ * (even at a lowered 40pps rate) overloads the EC such that key
+ * presses on the keyboard are missed. Given all of that, don't
+ * even attempt to use Synaptics mode. Relative mode seems to work
+ * just fine.
+ */
+ if (broken_olpc_ec) {
+ printk(KERN_INFO "synaptics: OLPC XO detected, not enabling Synaptics protocol.\n");
+ return -ENODEV;
+ }
+
psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
if (!priv)
return -ENOMEM;
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