[PATCH 4/4] toshiba_acpi: Add blacklist for devices with hotkey problems

[Seth Forshee <seth.forshee@canonical.com>]

The Satellite C670-10V has buggy implementation of the INFO method that
causes ACPI exceptions when executed:

 ACPI Error: Result stack is empty! State=ffff88012d70f800 (20110413/dswstate-98)
 ACPI Exception: AE_AML_NO_RETURN_VALUE, Missing or null operand (20110413/dsutils-646)
 ACPI Exception: AE_AML_NO_RETURN_VALUE, While creating Arg 0 (20110413/dsutils-763)
 ACPI Error: Method parse/execution failed [\_SB_.VALZ.GETE] (Node ffff880131175eb0), AE_AML_NO_RETURN_VALUE (20110413/psparse-536)
 ACPI Error: Method parse/execution failed [\_SB_.VALZ.INFO] (Node ffff880131175ed8), AE_AML_NO_RETURN_VALUE (20110413/psparse-536)
 toshiba_acpi: ACPI INFO method execution failed
 toshiba_acpi: Failed to query hotkey event

To work around this, add a blacklist of models with hotkey problems and
add this model to that list.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
 drivers/platform/x86/toshiba_acpi.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 6824bf7..a2f7cce 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -54,6 +54,7 @@
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/i8042.h>
+#include <linux/dmi.h>
 
 #include <asm/uaccess.h>
 
@@ -174,6 +175,18 @@ static const struct key_entry toshiba_acpi_keymap[] __devinitconst = {
 	{ KE_END, 0 },
 };
 
+/* Machines for which hotkeys should not be enabled */
+static struct dmi_system_id __devinitdata toshiba_hotkey_blacklist[] = {
+	{
+		.ident = "Toshiba Satellite C670-10V",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE C670-10V"),
+		},
+	},
+	{}
+};
+
 /* utility
  */
 
@@ -935,6 +948,11 @@ static int __devinit toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev)
 	int error;
 	u32 hci_result;
 
+	if (dmi_check_system(toshiba_hotkey_blacklist)) {
+		pr_info("Model has known hotkey problems, hotkeys will be disabled\n");
+		return 0;
+	}
+
 	dev->hotkey_dev = input_allocate_device();
 	if (!dev->hotkey_dev) {
 		pr_info("Unable to register input device\n");
-- 
1.7.5.4