[PATCH 03/98] ACPI: introduce sysfs I/F for dynamic tables

Len Brown
2009-03-28T04:32:39Z

From: Zhang Rui <rui.zhang@intel.com>

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@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/system.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
index 391d035..c885904 100644
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -62,6 +62,7 @@ module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
-------------------------------------------------------------------------- */
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 +129,40 @@ static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
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 +172,11 @@ static int acpi_system_sysfs_init(void)

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 +201,14 @@ static int acpi_system_sysfs_init(void)
}
} while (!result);
kobject_uevent(tables_kobj, KOBJ_ADD);
-
- return 0;
+ kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
+ result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
+
+ return result == AE_OK ? 0 : -EINVAL;
+err_dynamic_tables:
+ kobject_put(tables_kobj);
+err:
+ return -ENOMEM;
}

/*
--
1.6.0.6