[ACPI] generic Hot Key support

See Documentation/acpi-hotkey.txt

Use cmdline "acpi_specific_hotkey" to enable
legacy platform specific drivers.

http://bugzilla.kernel.org/show_bug.cgi?id=3887

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/acpi/toshiba_acpi.c b/drivers/acpi/toshiba_acpi.c
index c84997c9f964..bed8e53a5ee8 100644
--- a/drivers/acpi/toshiba_acpi.c
+++ b/drivers/acpi/toshiba_acpi.c
@@ -529,6 +529,11 @@ toshiba_acpi_init(void)
 
         if (acpi_disabled)
                 return -ENODEV;
+
+        if (!acpi_specific_hotkey_enabled){
+                printk(MY_INFO "Using generic hotkey driver\n");
+                return -ENODEV; 
+        }
         /* simple device detection: look for HCI method */
         if (is_valid_acpi_path(METHOD_HCI_1))
                 method_hci = METHOD_HCI_1;