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>

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 53c65a634b2639b320a6190d37edf3f818a84f4f..a977ef4c662507e474377aa5872c4c6efb7d0523 100644 (file)
--- 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;