ACPICA/ACPI: Add new host interfaces for _OSI support

Adds install/remove interfaces so that the host can dynamically
alter the global _OSI table. Also adds support for _OSI handlers.
Additional support: new debugger command (osi), and test support in
the acpiexec utility. Adds new file, utilities/utosi.c.
ACPICA bugzilla 836.

The Linux OSL _OSI code is also changed.
acpi_osi_setup can't call acpi_install/remove_interface because ACPICA
is not initialized yet at this early time.
So we just save the osi string in acpi_osi_setup and will handle it
later in a new function acpi_osi_setup_late.

http://www.acpica.org/bugzilla/show_bug.cgi?id=836

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 124 insertions, 1 deletions

diff --git a/drivers/acpi/acpica/utxface.c b/drivers/acpi/acpica/utxface.c
index 7f8cefcb2b32..c2da90f5fbe9 100644
--- a/drivers/acpi/acpica/utxface.c
+++ b/drivers/acpi/acpica/utxface.c
@@ -110,6 +110,15 @@ acpi_status __init acpi_initialize_subsystem(void)
                 return_ACPI_STATUS(status);
         }
 
+        /* Initialize the global OSI interfaces list with the static names */
+
+        status = acpi_ut_initialize_interfaces();
+        if (ACPI_FAILURE(status)) {
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "During OSI interfaces initialization"));
+                return_ACPI_STATUS(status);
+        }
+
         /* If configured, initialize the AML debugger */
 
         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
@@ -506,6 +515,7 @@ acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
 
 ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)
 #endif                          /*  ACPI_FUTURE_USAGE  */
+
 /*****************************************************************************
  *
  * FUNCTION:    acpi_purge_cached_objects
@@ -529,4 +539,117 @@ acpi_status acpi_purge_cached_objects(void)
 }
 
 ACPI_EXPORT_SYMBOL(acpi_purge_cached_objects)
-#endif
+
+/*****************************************************************************
+ *
+ * FUNCTION:    acpi_install_interface
+ *
+ * PARAMETERS:  interface_name      - The interface to install
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install an _OSI interface to the global list
+ *
+ ****************************************************************************/
+acpi_status acpi_install_interface(acpi_string interface_name)
+{
+        acpi_status status;
+        struct acpi_interface_info *interface_info;
+
+        /* Parameter validation */
+
+        if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
+                return (AE_BAD_PARAMETER);
+        }
+
+        (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
+
+        /* Check if the interface name is already in the global list */
+
+        interface_info = acpi_ut_get_interface(interface_name);
+        if (interface_info) {
+                /*
+                 * The interface already exists in the list. This is OK if the
+                 * interface has been marked invalid -- just clear the bit.
+                 */
+                if (interface_info->flags & ACPI_OSI_INVALID) {
+                        interface_info->flags &= ~ACPI_OSI_INVALID;
+                        status = AE_OK;
+                } else {
+                        status = AE_ALREADY_EXISTS;
+                }
+        } else {
+                /* New interface name, install into the global list */
+
+                status = acpi_ut_install_interface(interface_name);
+        }
+
+        acpi_os_release_mutex(acpi_gbl_osi_mutex);
+        return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_install_interface)
+
+/*****************************************************************************
+ *
+ * FUNCTION:    acpi_remove_interface
+ *
+ * PARAMETERS:  interface_name      - The interface to remove
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove an _OSI interface from the global list
+ *
+ ****************************************************************************/
+acpi_status acpi_remove_interface(acpi_string interface_name)
+{
+        acpi_status status;
+
+        /* Parameter validation */
+
+        if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
+                return (AE_BAD_PARAMETER);
+        }
+
+        (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
+
+        status = acpi_ut_remove_interface(interface_name);
+
+        acpi_os_release_mutex(acpi_gbl_osi_mutex);
+        return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_remove_interface)
+
+/*****************************************************************************
+ *
+ * FUNCTION:    acpi_install_interface_handler
+ *
+ * PARAMETERS:  Handler             - The _OSI interface handler to install
+ *                                    NULL means "remove existing handler"
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for the predefined _OSI ACPI method.
+ *              invoked during execution of the internal implementation of
+ *              _OSI. A NULL handler simply removes any existing handler.
+ *
+ ****************************************************************************/
+acpi_status acpi_install_interface_handler(acpi_interface_handler handler)
+{
+        acpi_status status = AE_OK;
+
+        (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
+
+        if (handler && acpi_gbl_interface_handler) {
+                status = AE_ALREADY_EXISTS;
+        } else {
+                acpi_gbl_interface_handler = handler;
+        }
+
+        acpi_os_release_mutex(acpi_gbl_osi_mutex);
+        return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_install_interface_handler)
+#endif                          /* !ACPI_ASL_COMPILER */