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ACPI: introduce sysfs I/F for dynamic tables

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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>
This commit is contained in:
Zhang Rui 2009-02-26 11:27:23 +08:00 committed by Len Brown
parent c15d8a6499
commit 4658e4ef9d
1 changed files with 47 additions and 2 deletions
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49
drivers/acpi/system.c
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@ -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);
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;
}
/*