SSDT tables may be loaded at runtime.
create sysfs I/F for these dynamic tables
in /sys/firmware/acpi/tables/dynamic/.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/acpi/system.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 46 insertions(+), 2 deletions(-)
Index: linux-acpi-2.6/drivers/acpi/system.c
===================================================================
--- linux-acpi-2.6.orig/drivers/acpi/system.c 2008-11-10 10:55:48.000000000 +0800
+++ linux-acpi-2.6/drivers/acpi/system.c 2008-11-10 10:56:32.000000000 +0800
@@ -62,6 +62,7 @@
-------------------------------------------------------------------------- */
static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;
+static struct kobject *dynamic_tables_kobj;
struct acpi_table_attr {
struct bin_attribute attr;
@@ -128,6 +128,40 @@
return;
}
+static acpi_status
+acpi_sysfs_table_handler(u32 event, void *table, void *context)
+{
+ struct acpi_table_attr *table_attr;
+
+ switch (event) {
+ case ACPI_TABLE_EVENT_LOAD:
+ table_attr =
+ kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
+ if (!table_attr)
+ return AE_NO_MEMORY;
+
+ acpi_table_attr_init(table_attr, table);
+ if (sysfs_create_bin_file(dynamic_tables_kobj,
+ &table_attr->attr)) {
+ kfree(table_attr);
+ return AE_ERROR;
+ } else
+ list_add_tail(&table_attr->node,
+ &acpi_table_attr_list);
+ break;
+ case ACPI_TABLE_EVENT_UNLOAD:
+ /*
+ * we do not need to do anything right now
+ * because the table is not deleted from the
+ * global table list when unloading it.
+ */
+ break;
+ default:
+ return AE_BAD_PARAMETER;
+ }
+ return AE_OK;
+}
+
static int acpi_system_sysfs_init(void)
{
struct acpi_table_attr *table_attr;
@@ -137,7 +171,11 @@
tables_kobj = kobject_create_and_add("tables", acpi_kobj);
if (!tables_kobj)
- return -ENOMEM;
+ goto err;
+
+ dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
+ if (!dynamic_tables_kobj)
+ goto err_dynamic_tables;
do {
result = acpi_get_table_by_index(table_index, &table_header);
@@ -162,8 +200,14 @@
}
} while (!result);
kobject_uevent(tables_kobj, KOBJ_ADD);
+ kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
+ acpi_gbl_table_handler = acpi_sysfs_table_handler;
return 0;
+err_dynamic_tables:
+ kobject_put(tables_kobj);
+err:
+ return -ENOMEM;
}
/*
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