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Commit 4658e4ef authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

ACPI: introduce sysfs I/F for dynamic tables 



SSDT tables may be loaded at runtime.
create sysfs I/F for these dynamic tables in
/sys/firmware/acpi/tables/dynamic/.

Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent c15d8a64

drivers/acpi/system.c

+48 −3
Original line number Original line Diff line number Diff line
@@ -62,6 +62,7 @@ module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); 
   -------------------------------------------------------------------------- */

   -------------------------------------------------------------------------- */

static LIST_HEAD(acpi_table_attr_list);

static LIST_HEAD(acpi_table_attr_list);

static struct kobject *tables_kobj;

static struct kobject *tables_kobj;

static struct kobject *dynamic_tables_kobj;





struct acpi_table_attr {

struct acpi_table_attr {

	struct bin_attribute attr;

	struct bin_attribute attr;
@@ -128,6 +129,40 @@ static void acpi_table_attr_init(struct acpi_table_attr *table_attr, 
	return;

	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)

static int acpi_system_sysfs_init(void)

{

{

	struct acpi_table_attr *table_attr;

	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);

	tables_kobj = kobject_create_and_add("tables", acpi_kobj);

	if (!tables_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 {

	do {

		result = acpi_get_table_by_index(table_index, &table_header);

		result = acpi_get_table_by_index(table_index, &table_header);
@@ -162,8 +201,14 @@ static int acpi_system_sysfs_init(void) 
		}

		}

	} while (!result);

	} while (!result);

	kobject_uevent(tables_kobj, KOBJ_ADD);

	kobject_uevent(tables_kobj, KOBJ_ADD);

	kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);

	result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);





	return 0;

	return result == AE_OK ? 0 : -EINVAL;

err_dynamic_tables:

	kobject_put(tables_kobj);

err:

	return -ENOMEM;

}

}





/*

/*