Input: elantech - fix crc_enabled for Fujitsu H730

The Fujitsu H730 does not work with crc_enabled = 0, even though the crc_enabled bit in the firmware version indicated it would. When switching this value to crc_enabled to 1, the touchpad works. This patch uses DMI to detect H730. Reported-by: Stefan Valouch <[email protected]> Tested-by: Stefan Valouch <[email protected]> Tested-by: Alfredo Gemma <[email protected]> Signed-off-by: Ulrik De Bie <[email protected]> Acked-by: Hans de Goede <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
TechNexion · Nov 8, 2014 · 0dc1587 · 0dc1587
1 parent caeb0d3
commit 0dc1587
Showing 1 changed file with 18 additions and 1 deletion.
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
@@ -1450,6 +1450,22 @@ static int elantech_reconnect(struct psmouse *psmouse)
 	return 0;
 }
 
+/*
+ * Some hw_version 4 models do not work with crc_disabled
+ */
+static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+	{
+		/* Fujitsu H730 does not work with crc_enabled == 0 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
+		},
+	},
+#endif
+	{ }
+};
+
 /*
  * Some hw_version 3 models go into error state when we try to set
  * bit 3 and/or bit 1 of r10.
@@ -1525,7 +1541,8 @@ static int elantech_set_properties(struct elantech_data *etd)
 	 * The signatures of v3 and v4 packets change depending on the
 	 * value of this hardware flag.
 	 */
-	etd->crc_enabled = ((etd->fw_version & 0x4000) == 0x4000);
+	etd->crc_enabled = (etd->fw_version & 0x4000) == 0x4000 ||
+			   dmi_check_system(elantech_dmi_force_crc_enabled);
 
 	/* Enable real hardware resolution on hw_version 3 ? */
 	etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);