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ACPI / scan: Make container driver use struct acpi_scan_handler 

Make the ACPI container driver use struct acpi_scan_handler for
representing the object used to initialize ACPI containers and remove
the ACPI driver structure used previously and the data structures
created by it, since in fact they were not used for any purpose.

This simplifies the code and reduces the kernel's memory footprint by
avoiding the registration of a struct device_driver object with the
driver core and creation of its sysfs directory which is unnecessary.

In addition to that, make the namespace walk callback used for
installing the notify handlers for ACPI containers more
straightforward.

This change includes fixes from Toshi Kani.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Tested-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Tested-by: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Rafael J. Wysocki 2013-02-08 23:52:39 +01:00
parent 38475b3be1
commit 737f1a9f80
4 changed files with 47 additions and 136 deletions
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2
drivers/acpi/Kconfig
View File

@ -337,7 +337,7 @@ config X86_PM_TIMER
systems require this timer.
config ACPI_CONTAINER
tristate "Container and Module Devices (EXPERIMENTAL)"
bool "Container and Module Devices (EXPERIMENTAL)"
depends on EXPERIMENTAL
default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
help

175
drivers/acpi/container.c
View File

@ -38,42 +38,31 @@
#define PREFIX "ACPI: "
#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
#define ACPI_CONTAINER_CLASS "container"
#define INSTALL_NOTIFY_HANDLER 1
#define UNINSTALL_NOTIFY_HANDLER 2
#define _COMPONENT ACPI_CONTAINER_COMPONENT
ACPI_MODULE_NAME("container");
MODULE_AUTHOR("Anil S Keshavamurthy");
MODULE_DESCRIPTION("ACPI container driver");
MODULE_LICENSE("GPL");
static int acpi_container_add(struct acpi_device *device);
static int acpi_container_remove(struct acpi_device *device);
static const struct acpi_device_id container_device_ids[] = {
{"ACPI0004", 0},
{"PNP0A05", 0},
{"PNP0A06", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, container_device_ids);
static struct acpi_driver acpi_container_driver = {
.name = "container",
.class = ACPI_CONTAINER_CLASS,
static int container_device_attach(struct acpi_device *device,
const struct acpi_device_id *not_used)
{
/*
* FIXME: This is necessary, so that acpi_eject_store() doesn't return
* -ENODEV for containers.
*/
return 1;
}
static struct acpi_scan_handler container_device_handler = {
.ids = container_device_ids,
.ops = {
.add = acpi_container_add,
.remove = acpi_container_remove,
},
.attach = container_device_attach,
};
/*******************************************************************/
static int is_device_present(acpi_handle handle)
{
acpi_handle temp;
@ -92,49 +81,6 @@ static int is_device_present(acpi_handle handle)
return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
}
static bool is_container_device(const char *hid)
{
const struct acpi_device_id *container_id;
for (container_id = container_device_ids;
container_id->id[0]; container_id++) {
if (!strcmp((char *)container_id->id, hid))
return true;
}
return false;
}
/*******************************************************************/
static int acpi_container_add(struct acpi_device *device)
{
struct acpi_container *container;
container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
if (!container)
return -ENOMEM;
container->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
device->driver_data = container;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
acpi_device_name(device), acpi_device_bid(device)));
return 0;
}
static int acpi_container_remove(struct acpi_device *device)
{
acpi_status status = AE_OK;
struct acpi_container *pc = NULL;
pc = acpi_driver_data(device);
kfree(pc);
return status;
}
static void container_notify_cb(acpi_handle handle, u32 type, void *context)
{
struct acpi_device *device = NULL;
@ -199,84 +145,43 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
return;
}
static acpi_status
container_walk_namespace_cb(acpi_handle handle,
u32 lvl, void *context, void **rv)
static bool is_container(acpi_handle handle)
{
char *hid = NULL;
struct acpi_device_info *info;
acpi_status status;
int *action = context;
bool ret = false;
status = acpi_get_object_info(handle, &info);
if (ACPI_FAILURE(status)) {
return AE_OK;
if (ACPI_FAILURE(acpi_get_object_info(handle, &info)))
return false;
if (info->valid & ACPI_VALID_HID) {
const struct acpi_device_id *id;
for (id = container_device_ids; id->id[0]; id++) {
ret = !strcmp((char *)id->id, info->hardware_id.string);
if (ret)
break;
}
}
if (info->valid & ACPI_VALID_HID)
hid = info->hardware_id.string;
if (hid == NULL) {
goto end;
}
if (!is_container_device(hid))
goto end;
switch (*action) {
case INSTALL_NOTIFY_HANDLER:
acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
container_notify_cb, NULL);
break;
case UNINSTALL_NOTIFY_HANDLER:
acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
container_notify_cb);
break;
default:
break;
}
end:
kfree(info);
return ret;
}
static acpi_status acpi_container_register_notify_handler(acpi_handle handle,
u32 lvl, void *ctxt,
void **retv)
{
if (is_container(handle))
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
container_notify_cb, NULL);
return AE_OK;
}
static int __init acpi_container_init(void)
void __init acpi_container_init(void)
{
int result = 0;
int action = INSTALL_NOTIFY_HANDLER;
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
acpi_container_register_notify_handler, NULL,
NULL, NULL);
result = acpi_bus_register_driver(&acpi_container_driver);
if (result < 0) {
return (result);
}
/* register notify handler to every container device */
acpi_walk_namespace(ACPI_TYPE_DEVICE,
ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
container_walk_namespace_cb, NULL, &action, NULL);
return (0);
acpi_scan_add_handler(&container_device_handler);
}
static void __exit acpi_container_exit(void)
{
int action = UNINSTALL_NOTIFY_HANDLER;
acpi_walk_namespace(ACPI_TYPE_DEVICE,
ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
container_walk_namespace_cb, NULL, &action, NULL);
acpi_bus_unregister_driver(&acpi_container_driver);
return;
}
module_init(acpi_container_init);
module_exit(acpi_container_exit);

5
drivers/acpi/internal.h
View File

@ -30,6 +30,11 @@ void acpi_pci_link_init(void);
void acpi_platform_init(void);
int acpi_sysfs_init(void);
void acpi_csrt_init(void);
#ifdef CONFIG_ACPI_CONTAINER
void acpi_container_init(void);
#else
static inline void acpi_container_init(void) {}
#endif
#ifdef CONFIG_DEBUG_FS
extern struct dentry *acpi_debugfs_dir;

1
drivers/acpi/scan.c
View File

@ -1758,6 +1758,7 @@ int __init acpi_scan_init(void)
acpi_pci_link_init();
acpi_platform_init();
acpi_csrt_init();
acpi_container_init();
/*
* Enumerate devices in the ACPI namespace.