0,0 → 1,1557 |
/* |
* scan.c - support for transforming the ACPI namespace into individual objects |
*/ |
|
#include <linux/module.h> |
#include <linux/init.h> |
#include <linux/slab.h> |
#include <linux/kernel.h> |
#include <linux/acpi.h> |
#include <linux/signal.h> |
#include <linux/kthread.h> |
#include <linux/dmi.h> |
|
#include <acpi/acpi_drivers.h> |
|
#include "internal.h" |
|
#define _COMPONENT ACPI_BUS_COMPONENT |
ACPI_MODULE_NAME("scan"); |
#define STRUCT_TO_INT(s) (*((int*)&s)) |
extern struct acpi_device *acpi_root; |
|
#define ACPI_BUS_CLASS "system_bus" |
#define ACPI_BUS_HID "LNXSYBUS" |
#define ACPI_BUS_DEVICE_NAME "System Bus" |
|
#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
|
static LIST_HEAD(acpi_device_list); |
static LIST_HEAD(acpi_bus_id_list); |
DEFINE_MUTEX(acpi_device_lock); |
LIST_HEAD(acpi_wakeup_device_list); |
|
struct acpi_device_bus_id{ |
char bus_id[15]; |
unsigned int instance_no; |
struct list_head node; |
}; |
|
/* |
* Creates hid/cid(s) string needed for modalias and uevent |
* e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: |
* char *modalias: "acpi:IBM0001:ACPI0001" |
*/ |
static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
int size) |
{ |
int len; |
int count; |
struct acpi_hardware_id *id; |
|
len = snprintf(modalias, size, "acpi:"); |
size -= len; |
|
list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
count = snprintf(&modalias[len], size, "%s:", id->id); |
if (count < 0 || count >= size) |
return -EINVAL; |
len += count; |
size -= count; |
} |
|
modalias[len] = '\0'; |
return len; |
} |
|
static ssize_t |
acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
int len; |
|
/* Device has no HID and no CID or string is >1024 */ |
len = create_modalias(acpi_dev, buf, 1024); |
if (len <= 0) |
return 0; |
buf[len++] = '\n'; |
return len; |
} |
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); |
|
static void acpi_bus_hot_remove_device(void *context) |
{ |
struct acpi_device *device; |
acpi_handle handle = context; |
struct acpi_object_list arg_list; |
union acpi_object arg; |
acpi_status status = AE_OK; |
|
if (acpi_bus_get_device(handle, &device)) |
return; |
|
if (!device) |
return; |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"Hot-removing device %s...\n", dev_name(&device->dev))); |
|
if (acpi_bus_trim(device, 1)) { |
printk(KERN_ERR PREFIX |
"Removing device failed\n"); |
return; |
} |
|
/* power off device */ |
status = acpi_evaluate_object(handle, "_PS3", NULL, NULL); |
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
printk(KERN_WARNING PREFIX |
"Power-off device failed\n"); |
|
if (device->flags.lockable) { |
arg_list.count = 1; |
arg_list.pointer = &arg; |
arg.type = ACPI_TYPE_INTEGER; |
arg.integer.value = 0; |
acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); |
} |
|
arg_list.count = 1; |
arg_list.pointer = &arg; |
arg.type = ACPI_TYPE_INTEGER; |
arg.integer.value = 1; |
|
/* |
* TBD: _EJD support. |
*/ |
status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); |
if (ACPI_FAILURE(status)) |
printk(KERN_WARNING PREFIX |
"Eject device failed\n"); |
|
return; |
} |
|
static ssize_t |
acpi_eject_store(struct device *d, struct device_attribute *attr, |
const char *buf, size_t count) |
{ |
int ret = count; |
acpi_status status; |
acpi_object_type type = 0; |
struct acpi_device *acpi_device = to_acpi_device(d); |
|
if ((!count) || (buf[0] != '1')) { |
return -EINVAL; |
} |
#ifndef FORCE_EJECT |
if (acpi_device->driver == NULL) { |
ret = -ENODEV; |
goto err; |
} |
#endif |
status = acpi_get_type(acpi_device->handle, &type); |
if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { |
ret = -ENODEV; |
goto err; |
} |
|
acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle); |
err: |
return ret; |
} |
|
static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
|
static ssize_t |
acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
|
return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
} |
static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
|
static ssize_t |
acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; |
int result; |
|
result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
if (result) |
goto end; |
|
result = sprintf(buf, "%s\n", (char*)path.pointer); |
kfree(path.pointer); |
end: |
return result; |
} |
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
|
static int acpi_device_setup_files(struct acpi_device *dev) |
{ |
acpi_status status; |
acpi_handle temp; |
int result = 0; |
|
/* |
* Devices gotten from FADT don't have a "path" attribute |
*/ |
if (dev->handle) { |
result = device_create_file(&dev->dev, &dev_attr_path); |
if (result) |
goto end; |
} |
|
result = device_create_file(&dev->dev, &dev_attr_hid); |
if (result) |
goto end; |
|
result = device_create_file(&dev->dev, &dev_attr_modalias); |
if (result) |
goto end; |
|
/* |
* If device has _EJ0, 'eject' file is created that is used to trigger |
* hot-removal function from userland. |
*/ |
status = acpi_get_handle(dev->handle, "_EJ0", &temp); |
if (ACPI_SUCCESS(status)) |
result = device_create_file(&dev->dev, &dev_attr_eject); |
end: |
return result; |
} |
|
static void acpi_device_remove_files(struct acpi_device *dev) |
{ |
acpi_status status; |
acpi_handle temp; |
|
/* |
* If device has _EJ0, 'eject' file is created that is used to trigger |
* hot-removal function from userland. |
*/ |
status = acpi_get_handle(dev->handle, "_EJ0", &temp); |
if (ACPI_SUCCESS(status)) |
device_remove_file(&dev->dev, &dev_attr_eject); |
|
device_remove_file(&dev->dev, &dev_attr_modalias); |
device_remove_file(&dev->dev, &dev_attr_hid); |
if (dev->handle) |
device_remove_file(&dev->dev, &dev_attr_path); |
} |
/* -------------------------------------------------------------------------- |
ACPI Bus operations |
-------------------------------------------------------------------------- */ |
|
int acpi_match_device_ids(struct acpi_device *device, |
const struct acpi_device_id *ids) |
{ |
const struct acpi_device_id *id; |
struct acpi_hardware_id *hwid; |
|
/* |
* If the device is not present, it is unnecessary to load device |
* driver for it. |
*/ |
if (!device->status.present) |
return -ENODEV; |
|
for (id = ids; id->id[0]; id++) |
list_for_each_entry(hwid, &device->pnp.ids, list) |
if (!strcmp((char *) id->id, hwid->id)) |
return 0; |
|
return -ENOENT; |
} |
EXPORT_SYMBOL(acpi_match_device_ids); |
|
static void acpi_free_ids(struct acpi_device *device) |
{ |
struct acpi_hardware_id *id, *tmp; |
|
list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) { |
kfree(id->id); |
kfree(id); |
} |
} |
|
static void acpi_device_release(struct device *dev) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
|
acpi_free_ids(acpi_dev); |
kfree(acpi_dev); |
} |
|
static int acpi_device_suspend(struct device *dev, pm_message_t state) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
struct acpi_driver *acpi_drv = acpi_dev->driver; |
|
if (acpi_drv && acpi_drv->ops.suspend) |
return acpi_drv->ops.suspend(acpi_dev, state); |
return 0; |
} |
|
static int acpi_device_resume(struct device *dev) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
struct acpi_driver *acpi_drv = acpi_dev->driver; |
|
if (acpi_drv && acpi_drv->ops.resume) |
return acpi_drv->ops.resume(acpi_dev); |
return 0; |
} |
|
static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
struct acpi_driver *acpi_drv = to_acpi_driver(drv); |
|
return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
} |
|
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
int len; |
|
if (add_uevent_var(env, "MODALIAS=")) |
return -ENOMEM; |
len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], |
sizeof(env->buf) - env->buflen); |
if (len >= (sizeof(env->buf) - env->buflen)) |
return -ENOMEM; |
env->buflen += len; |
return 0; |
} |
|
static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
{ |
struct acpi_device *device = data; |
|
device->driver->ops.notify(device, event); |
} |
|
static acpi_status acpi_device_notify_fixed(void *data) |
{ |
struct acpi_device *device = data; |
|
/* Fixed hardware devices have no handles */ |
acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); |
return AE_OK; |
} |
|
static int acpi_device_install_notify_handler(struct acpi_device *device) |
{ |
acpi_status status; |
|
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
status = |
acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
acpi_device_notify_fixed, |
device); |
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
status = |
acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
acpi_device_notify_fixed, |
device); |
else |
status = acpi_install_notify_handler(device->handle, |
ACPI_DEVICE_NOTIFY, |
acpi_device_notify, |
device); |
|
if (ACPI_FAILURE(status)) |
return -EINVAL; |
return 0; |
} |
|
static void acpi_device_remove_notify_handler(struct acpi_device *device) |
{ |
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
acpi_device_notify_fixed); |
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
acpi_device_notify_fixed); |
else |
acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
acpi_device_notify); |
} |
|
static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); |
static int acpi_start_single_object(struct acpi_device *); |
static int acpi_device_probe(struct device * dev) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
int ret; |
|
ret = acpi_bus_driver_init(acpi_dev, acpi_drv); |
if (!ret) { |
if (acpi_dev->bus_ops.acpi_op_start) |
acpi_start_single_object(acpi_dev); |
|
if (acpi_drv->ops.notify) { |
ret = acpi_device_install_notify_handler(acpi_dev); |
if (ret) { |
if (acpi_drv->ops.remove) |
acpi_drv->ops.remove(acpi_dev, |
acpi_dev->removal_type); |
return ret; |
} |
} |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"Found driver [%s] for device [%s]\n", |
acpi_drv->name, acpi_dev->pnp.bus_id)); |
get_device(dev); |
} |
return ret; |
} |
|
static int acpi_device_remove(struct device * dev) |
{ |
struct acpi_device *acpi_dev = to_acpi_device(dev); |
struct acpi_driver *acpi_drv = acpi_dev->driver; |
|
if (acpi_drv) { |
if (acpi_drv->ops.notify) |
acpi_device_remove_notify_handler(acpi_dev); |
if (acpi_drv->ops.remove) |
acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); |
} |
acpi_dev->driver = NULL; |
acpi_dev->driver_data = NULL; |
|
put_device(dev); |
return 0; |
} |
|
struct bus_type acpi_bus_type = { |
.name = "acpi", |
.suspend = acpi_device_suspend, |
.resume = acpi_device_resume, |
.match = acpi_bus_match, |
.probe = acpi_device_probe, |
.remove = acpi_device_remove, |
.uevent = acpi_device_uevent, |
}; |
|
static int acpi_device_register(struct acpi_device *device) |
{ |
int result; |
struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
int found = 0; |
|
/* |
* Linkage |
* ------- |
* Link this device to its parent and siblings. |
*/ |
INIT_LIST_HEAD(&device->children); |
INIT_LIST_HEAD(&device->node); |
INIT_LIST_HEAD(&device->wakeup_list); |
|
new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
if (!new_bus_id) { |
printk(KERN_ERR PREFIX "Memory allocation error\n"); |
return -ENOMEM; |
} |
|
mutex_lock(&acpi_device_lock); |
/* |
* Find suitable bus_id and instance number in acpi_bus_id_list |
* If failed, create one and link it into acpi_bus_id_list |
*/ |
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { |
if (!strcmp(acpi_device_bus_id->bus_id, |
acpi_device_hid(device))) { |
acpi_device_bus_id->instance_no++; |
found = 1; |
kfree(new_bus_id); |
break; |
} |
} |
if (!found) { |
acpi_device_bus_id = new_bus_id; |
strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
acpi_device_bus_id->instance_no = 0; |
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); |
} |
dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
|
if (device->parent) |
list_add_tail(&device->node, &device->parent->children); |
|
if (device->wakeup.flags.valid) |
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); |
mutex_unlock(&acpi_device_lock); |
|
if (device->parent) |
device->dev.parent = &device->parent->dev; |
device->dev.bus = &acpi_bus_type; |
device->dev.release = &acpi_device_release; |
result = device_register(&device->dev); |
if (result) { |
dev_err(&device->dev, "Error registering device\n"); |
goto end; |
} |
|
result = acpi_device_setup_files(device); |
if (result) |
printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
dev_name(&device->dev)); |
|
device->removal_type = ACPI_BUS_REMOVAL_NORMAL; |
return 0; |
end: |
mutex_lock(&acpi_device_lock); |
if (device->parent) |
list_del(&device->node); |
list_del(&device->wakeup_list); |
mutex_unlock(&acpi_device_lock); |
return result; |
} |
|
static void acpi_device_unregister(struct acpi_device *device, int type) |
{ |
mutex_lock(&acpi_device_lock); |
if (device->parent) |
list_del(&device->node); |
|
list_del(&device->wakeup_list); |
mutex_unlock(&acpi_device_lock); |
|
acpi_detach_data(device->handle, acpi_bus_data_handler); |
|
acpi_device_remove_files(device); |
device_unregister(&device->dev); |
} |
|
/* -------------------------------------------------------------------------- |
Driver Management |
-------------------------------------------------------------------------- */ |
/** |
* acpi_bus_driver_init - add a device to a driver |
* @device: the device to add and initialize |
* @driver: driver for the device |
* |
* Used to initialize a device via its device driver. Called whenever a |
* driver is bound to a device. Invokes the driver's add() ops. |
*/ |
static int |
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) |
{ |
int result = 0; |
|
if (!device || !driver) |
return -EINVAL; |
|
if (!driver->ops.add) |
return -ENOSYS; |
|
result = driver->ops.add(device); |
if (result) { |
device->driver = NULL; |
device->driver_data = NULL; |
return result; |
} |
|
device->driver = driver; |
|
/* |
* TBD - Configuration Management: Assign resources to device based |
* upon possible configuration and currently allocated resources. |
*/ |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"Driver successfully bound to device\n")); |
return 0; |
} |
|
static int acpi_start_single_object(struct acpi_device *device) |
{ |
int result = 0; |
struct acpi_driver *driver; |
|
|
if (!(driver = device->driver)) |
return 0; |
|
if (driver->ops.start) { |
result = driver->ops.start(device); |
if (result && driver->ops.remove) |
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); |
} |
|
return result; |
} |
|
/** |
* acpi_bus_register_driver - register a driver with the ACPI bus |
* @driver: driver being registered |
* |
* Registers a driver with the ACPI bus. Searches the namespace for all |
* devices that match the driver's criteria and binds. Returns zero for |
* success or a negative error status for failure. |
*/ |
int acpi_bus_register_driver(struct acpi_driver *driver) |
{ |
int ret; |
|
if (acpi_disabled) |
return -ENODEV; |
driver->drv.name = driver->name; |
driver->drv.bus = &acpi_bus_type; |
driver->drv.owner = driver->owner; |
|
ret = driver_register(&driver->drv); |
return ret; |
} |
|
EXPORT_SYMBOL(acpi_bus_register_driver); |
|
/** |
* acpi_bus_unregister_driver - unregisters a driver with the APIC bus |
* @driver: driver to unregister |
* |
* Unregisters a driver with the ACPI bus. Searches the namespace for all |
* devices that match the driver's criteria and unbinds. |
*/ |
void acpi_bus_unregister_driver(struct acpi_driver *driver) |
{ |
driver_unregister(&driver->drv); |
} |
|
EXPORT_SYMBOL(acpi_bus_unregister_driver); |
|
/* -------------------------------------------------------------------------- |
Device Enumeration |
-------------------------------------------------------------------------- */ |
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
{ |
acpi_status status; |
int ret; |
struct acpi_device *device; |
|
/* |
* Fixed hardware devices do not appear in the namespace and do not |
* have handles, but we fabricate acpi_devices for them, so we have |
* to deal with them specially. |
*/ |
if (handle == NULL) |
return acpi_root; |
|
do { |
status = acpi_get_parent(handle, &handle); |
if (status == AE_NULL_ENTRY) |
return NULL; |
if (ACPI_FAILURE(status)) |
return acpi_root; |
|
ret = acpi_bus_get_device(handle, &device); |
if (ret == 0) |
return device; |
} while (1); |
} |
|
acpi_status |
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) |
{ |
acpi_status status; |
acpi_handle tmp; |
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
union acpi_object *obj; |
|
status = acpi_get_handle(handle, "_EJD", &tmp); |
if (ACPI_FAILURE(status)) |
return status; |
|
status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); |
if (ACPI_SUCCESS(status)) { |
obj = buffer.pointer; |
status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
ejd); |
kfree(buffer.pointer); |
} |
return status; |
} |
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); |
|
void acpi_bus_data_handler(acpi_handle handle, void *context) |
{ |
|
/* TBD */ |
|
return; |
} |
|
static int acpi_bus_get_perf_flags(struct acpi_device *device) |
{ |
device->performance.state = ACPI_STATE_UNKNOWN; |
return 0; |
} |
|
static acpi_status |
acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, |
union acpi_object *package) |
{ |
int i = 0; |
union acpi_object *element = NULL; |
|
if (!device || !package || (package->package.count < 2)) |
return AE_BAD_PARAMETER; |
|
element = &(package->package.elements[0]); |
if (!element) |
return AE_BAD_PARAMETER; |
if (element->type == ACPI_TYPE_PACKAGE) { |
if ((element->package.count < 2) || |
(element->package.elements[0].type != |
ACPI_TYPE_LOCAL_REFERENCE) |
|| (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
return AE_BAD_DATA; |
device->wakeup.gpe_device = |
element->package.elements[0].reference.handle; |
device->wakeup.gpe_number = |
(u32) element->package.elements[1].integer.value; |
} else if (element->type == ACPI_TYPE_INTEGER) { |
device->wakeup.gpe_number = element->integer.value; |
} else |
return AE_BAD_DATA; |
|
element = &(package->package.elements[1]); |
if (element->type != ACPI_TYPE_INTEGER) { |
return AE_BAD_DATA; |
} |
device->wakeup.sleep_state = element->integer.value; |
|
if ((package->package.count - 2) > ACPI_MAX_HANDLES) { |
return AE_NO_MEMORY; |
} |
device->wakeup.resources.count = package->package.count - 2; |
for (i = 0; i < device->wakeup.resources.count; i++) { |
element = &(package->package.elements[i + 2]); |
if (element->type != ACPI_TYPE_LOCAL_REFERENCE) |
return AE_BAD_DATA; |
|
device->wakeup.resources.handles[i] = element->reference.handle; |
} |
|
acpi_gpe_can_wake(device->wakeup.gpe_device, device->wakeup.gpe_number); |
|
return AE_OK; |
} |
|
static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
{ |
struct acpi_device_id button_device_ids[] = { |
{"PNP0C0D", 0}, |
{"PNP0C0C", 0}, |
{"PNP0C0E", 0}, |
{"", 0}, |
}; |
acpi_status status; |
acpi_event_status event_status; |
|
device->wakeup.run_wake_count = 0; |
device->wakeup.flags.notifier_present = 0; |
|
/* Power button, Lid switch always enable wakeup */ |
if (!acpi_match_device_ids(device, button_device_ids)) { |
device->wakeup.flags.run_wake = 1; |
device->wakeup.flags.always_enabled = 1; |
return; |
} |
|
status = acpi_get_gpe_status(device->wakeup.gpe_device, |
device->wakeup.gpe_number, |
&event_status); |
if (status == AE_OK) |
device->wakeup.flags.run_wake = |
!!(event_status & ACPI_EVENT_FLAG_HANDLE); |
} |
|
static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
{ |
acpi_status status = 0; |
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
union acpi_object *package = NULL; |
int psw_error; |
|
/* _PRW */ |
status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); |
if (ACPI_FAILURE(status)) { |
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); |
goto end; |
} |
|
package = (union acpi_object *)buffer.pointer; |
status = acpi_bus_extract_wakeup_device_power_package(device, package); |
if (ACPI_FAILURE(status)) { |
ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); |
goto end; |
} |
|
kfree(buffer.pointer); |
|
device->wakeup.flags.valid = 1; |
device->wakeup.prepare_count = 0; |
acpi_bus_set_run_wake_flags(device); |
/* Call _PSW/_DSW object to disable its ability to wake the sleeping |
* system for the ACPI device with the _PRW object. |
* The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. |
* So it is necessary to call _DSW object first. Only when it is not |
* present will the _PSW object used. |
*/ |
psw_error = acpi_device_sleep_wake(device, 0, 0, 0); |
if (psw_error) |
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"error in _DSW or _PSW evaluation\n")); |
|
end: |
if (ACPI_FAILURE(status)) |
device->flags.wake_capable = 0; |
return 0; |
} |
|
static int acpi_bus_get_power_flags(struct acpi_device *device) |
{ |
acpi_status status = 0; |
acpi_handle handle = NULL; |
u32 i = 0; |
|
|
/* |
* Power Management Flags |
*/ |
status = acpi_get_handle(device->handle, "_PSC", &handle); |
if (ACPI_SUCCESS(status)) |
device->power.flags.explicit_get = 1; |
status = acpi_get_handle(device->handle, "_IRC", &handle); |
if (ACPI_SUCCESS(status)) |
device->power.flags.inrush_current = 1; |
|
/* |
* Enumerate supported power management states |
*/ |
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { |
struct acpi_device_power_state *ps = &device->power.states[i]; |
char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; |
|
/* Evaluate "_PRx" to se if power resources are referenced */ |
acpi_evaluate_reference(device->handle, object_name, NULL, |
&ps->resources); |
if (ps->resources.count) { |
device->power.flags.power_resources = 1; |
ps->flags.valid = 1; |
} |
|
/* Evaluate "_PSx" to see if we can do explicit sets */ |
object_name[2] = 'S'; |
status = acpi_get_handle(device->handle, object_name, &handle); |
if (ACPI_SUCCESS(status)) { |
ps->flags.explicit_set = 1; |
ps->flags.valid = 1; |
} |
|
/* State is valid if we have some power control */ |
if (ps->resources.count || ps->flags.explicit_set) |
ps->flags.valid = 1; |
|
ps->power = -1; /* Unknown - driver assigned */ |
ps->latency = -1; /* Unknown - driver assigned */ |
} |
|
/* Set defaults for D0 and D3 states (always valid) */ |
device->power.states[ACPI_STATE_D0].flags.valid = 1; |
device->power.states[ACPI_STATE_D0].power = 100; |
device->power.states[ACPI_STATE_D3].flags.valid = 1; |
device->power.states[ACPI_STATE_D3].power = 0; |
|
/* TBD: System wake support and resource requirements. */ |
|
device->power.state = ACPI_STATE_UNKNOWN; |
acpi_bus_get_power(device->handle, &(device->power.state)); |
|
return 0; |
} |
|
static int acpi_bus_get_flags(struct acpi_device *device) |
{ |
acpi_status status = AE_OK; |
acpi_handle temp = NULL; |
|
|
/* Presence of _STA indicates 'dynamic_status' */ |
status = acpi_get_handle(device->handle, "_STA", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.dynamic_status = 1; |
|
/* Presence of _RMV indicates 'removable' */ |
status = acpi_get_handle(device->handle, "_RMV", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.removable = 1; |
|
/* Presence of _EJD|_EJ0 indicates 'ejectable' */ |
status = acpi_get_handle(device->handle, "_EJD", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.ejectable = 1; |
else { |
status = acpi_get_handle(device->handle, "_EJ0", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.ejectable = 1; |
} |
|
/* Presence of _LCK indicates 'lockable' */ |
status = acpi_get_handle(device->handle, "_LCK", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.lockable = 1; |
|
/* Presence of _PS0|_PR0 indicates 'power manageable' */ |
status = acpi_get_handle(device->handle, "_PS0", &temp); |
if (ACPI_FAILURE(status)) |
status = acpi_get_handle(device->handle, "_PR0", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.power_manageable = 1; |
|
/* Presence of _PRW indicates wake capable */ |
status = acpi_get_handle(device->handle, "_PRW", &temp); |
if (ACPI_SUCCESS(status)) |
device->flags.wake_capable = 1; |
|
/* TBD: Performance management */ |
|
return 0; |
} |
|
static void acpi_device_get_busid(struct acpi_device *device) |
{ |
char bus_id[5] = { '?', 0 }; |
struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; |
int i = 0; |
|
/* |
* Bus ID |
* ------ |
* The device's Bus ID is simply the object name. |
* TBD: Shouldn't this value be unique (within the ACPI namespace)? |
*/ |
if (ACPI_IS_ROOT_DEVICE(device)) { |
strcpy(device->pnp.bus_id, "ACPI"); |
return; |
} |
|
switch (device->device_type) { |
case ACPI_BUS_TYPE_POWER_BUTTON: |
strcpy(device->pnp.bus_id, "PWRF"); |
break; |
case ACPI_BUS_TYPE_SLEEP_BUTTON: |
strcpy(device->pnp.bus_id, "SLPF"); |
break; |
default: |
acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
/* Clean up trailing underscores (if any) */ |
for (i = 3; i > 1; i--) { |
if (bus_id[i] == '_') |
bus_id[i] = '\0'; |
else |
break; |
} |
strcpy(device->pnp.bus_id, bus_id); |
break; |
} |
} |
|
/* |
* acpi_bay_match - see if a device is an ejectable driver bay |
* |
* If an acpi object is ejectable and has one of the ACPI ATA methods defined, |
* then we can safely call it an ejectable drive bay |
*/ |
static int acpi_bay_match(struct acpi_device *device){ |
acpi_status status; |
acpi_handle handle; |
acpi_handle tmp; |
acpi_handle phandle; |
|
handle = device->handle; |
|
status = acpi_get_handle(handle, "_EJ0", &tmp); |
if (ACPI_FAILURE(status)) |
return -ENODEV; |
|
if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || |
(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || |
(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || |
(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) |
return 0; |
|
if (acpi_get_parent(handle, &phandle)) |
return -ENODEV; |
|
if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || |
(ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || |
(ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || |
(ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) |
return 0; |
|
return -ENODEV; |
} |
|
/* |
* acpi_dock_match - see if a device has a _DCK method |
*/ |
static int acpi_dock_match(struct acpi_device *device) |
{ |
acpi_handle tmp; |
return acpi_get_handle(device->handle, "_DCK", &tmp); |
} |
|
char *acpi_device_hid(struct acpi_device *device) |
{ |
struct acpi_hardware_id *hid; |
|
hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
return hid->id; |
} |
EXPORT_SYMBOL(acpi_device_hid); |
|
static void acpi_add_id(struct acpi_device *device, const char *dev_id) |
{ |
struct acpi_hardware_id *id; |
|
id = kmalloc(sizeof(*id), GFP_KERNEL); |
if (!id) |
return; |
|
id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL); |
if (!id->id) { |
kfree(id); |
return; |
} |
|
strcpy(id->id, dev_id); |
list_add_tail(&id->list, &device->pnp.ids); |
} |
|
/* |
* Old IBM workstations have a DSDT bug wherein the SMBus object |
* lacks the SMBUS01 HID and the methods do not have the necessary "_" |
* prefix. Work around this. |
*/ |
static int acpi_ibm_smbus_match(struct acpi_device *device) |
{ |
acpi_handle h_dummy; |
struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; |
int result; |
|
if (!dmi_name_in_vendors("IBM")) |
return -ENODEV; |
|
/* Look for SMBS object */ |
result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path); |
if (result) |
return result; |
|
if (strcmp("SMBS", path.pointer)) { |
result = -ENODEV; |
goto out; |
} |
|
/* Does it have the necessary (but misnamed) methods? */ |
result = -ENODEV; |
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) && |
ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) && |
ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy))) |
result = 0; |
out: |
kfree(path.pointer); |
return result; |
} |
|
static void acpi_device_set_id(struct acpi_device *device) |
{ |
acpi_status status; |
struct acpi_device_info *info; |
struct acpica_device_id_list *cid_list; |
int i; |
|
switch (device->device_type) { |
case ACPI_BUS_TYPE_DEVICE: |
if (ACPI_IS_ROOT_DEVICE(device)) { |
acpi_add_id(device, ACPI_SYSTEM_HID); |
break; |
} |
|
status = acpi_get_object_info(device->handle, &info); |
if (ACPI_FAILURE(status)) { |
printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__); |
return; |
} |
|
if (info->valid & ACPI_VALID_HID) |
acpi_add_id(device, info->hardware_id.string); |
if (info->valid & ACPI_VALID_CID) { |
cid_list = &info->compatible_id_list; |
for (i = 0; i < cid_list->count; i++) |
acpi_add_id(device, cid_list->ids[i].string); |
} |
if (info->valid & ACPI_VALID_ADR) { |
device->pnp.bus_address = info->address; |
device->flags.bus_address = 1; |
} |
|
kfree(info); |
|
/* |
* Some devices don't reliably have _HIDs & _CIDs, so add |
* synthetic HIDs to make sure drivers can find them. |
*/ |
if (acpi_is_video_device(device)) |
acpi_add_id(device, ACPI_VIDEO_HID); |
else if (ACPI_SUCCESS(acpi_bay_match(device))) |
acpi_add_id(device, ACPI_BAY_HID); |
else if (ACPI_SUCCESS(acpi_dock_match(device))) |
acpi_add_id(device, ACPI_DOCK_HID); |
else if (!acpi_ibm_smbus_match(device)) |
acpi_add_id(device, ACPI_SMBUS_IBM_HID); |
else if (!acpi_device_hid(device) && |
ACPI_IS_ROOT_DEVICE(device->parent)) { |
acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ |
strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); |
strcpy(device->pnp.device_class, ACPI_BUS_CLASS); |
} |
|
break; |
case ACPI_BUS_TYPE_POWER: |
acpi_add_id(device, ACPI_POWER_HID); |
break; |
case ACPI_BUS_TYPE_PROCESSOR: |
acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID); |
break; |
case ACPI_BUS_TYPE_THERMAL: |
acpi_add_id(device, ACPI_THERMAL_HID); |
break; |
case ACPI_BUS_TYPE_POWER_BUTTON: |
acpi_add_id(device, ACPI_BUTTON_HID_POWERF); |
break; |
case ACPI_BUS_TYPE_SLEEP_BUTTON: |
acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF); |
break; |
} |
|
/* |
* We build acpi_devices for some objects that don't have _HID or _CID, |
* e.g., PCI bridges and slots. Drivers can't bind to these objects, |
* but we do use them indirectly by traversing the acpi_device tree. |
* This generic ID isn't useful for driver binding, but it provides |
* the useful property that "every acpi_device has an ID." |
*/ |
if (list_empty(&device->pnp.ids)) |
acpi_add_id(device, "device"); |
} |
|
static int acpi_device_set_context(struct acpi_device *device) |
{ |
acpi_status status; |
|
/* |
* Context |
* ------- |
* Attach this 'struct acpi_device' to the ACPI object. This makes |
* resolutions from handle->device very efficient. Fixed hardware |
* devices have no handles, so we skip them. |
*/ |
if (!device->handle) |
return 0; |
|
status = acpi_attach_data(device->handle, |
acpi_bus_data_handler, device); |
if (ACPI_SUCCESS(status)) |
return 0; |
|
printk(KERN_ERR PREFIX "Error attaching device data\n"); |
return -ENODEV; |
} |
|
static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) |
{ |
if (!dev) |
return -EINVAL; |
|
dev->removal_type = ACPI_BUS_REMOVAL_EJECT; |
device_release_driver(&dev->dev); |
|
if (!rmdevice) |
return 0; |
|
/* |
* unbind _ADR-Based Devices when hot removal |
*/ |
if (dev->flags.bus_address) { |
if ((dev->parent) && (dev->parent->ops.unbind)) |
dev->parent->ops.unbind(dev); |
} |
acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); |
|
return 0; |
} |
|
static int acpi_add_single_object(struct acpi_device **child, |
acpi_handle handle, int type, |
unsigned long long sta, |
struct acpi_bus_ops *ops) |
{ |
int result; |
struct acpi_device *device; |
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
|
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
if (!device) { |
printk(KERN_ERR PREFIX "Memory allocation error\n"); |
return -ENOMEM; |
} |
|
INIT_LIST_HEAD(&device->pnp.ids); |
device->device_type = type; |
device->handle = handle; |
device->parent = acpi_bus_get_parent(handle); |
device->bus_ops = *ops; /* workround for not call .start */ |
STRUCT_TO_INT(device->status) = sta; |
|
acpi_device_get_busid(device); |
|
/* |
* Flags |
* ----- |
* Note that we only look for object handles -- cannot evaluate objects |
* until we know the device is present and properly initialized. |
*/ |
result = acpi_bus_get_flags(device); |
if (result) |
goto end; |
|
/* |
* Initialize Device |
* ----------------- |
* TBD: Synch with Core's enumeration/initialization process. |
*/ |
acpi_device_set_id(device); |
|
/* |
* Power Management |
* ---------------- |
*/ |
if (device->flags.power_manageable) { |
result = acpi_bus_get_power_flags(device); |
if (result) |
goto end; |
} |
|
/* |
* Wakeup device management |
*----------------------- |
*/ |
if (device->flags.wake_capable) { |
result = acpi_bus_get_wakeup_device_flags(device); |
if (result) |
goto end; |
} |
|
/* |
* Performance Management |
* ---------------------- |
*/ |
if (device->flags.performance_manageable) { |
result = acpi_bus_get_perf_flags(device); |
if (result) |
goto end; |
} |
|
if ((result = acpi_device_set_context(device))) |
goto end; |
|
result = acpi_device_register(device); |
|
/* |
* Bind _ADR-Based Devices when hot add |
*/ |
if (device->flags.bus_address) { |
if (device->parent && device->parent->ops.bind) |
device->parent->ops.bind(device); |
} |
|
end: |
if (!result) { |
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"Adding %s [%s] parent %s\n", dev_name(&device->dev), |
(char *) buffer.pointer, |
device->parent ? dev_name(&device->parent->dev) : |
"(null)")); |
kfree(buffer.pointer); |
*child = device; |
} else |
acpi_device_release(&device->dev); |
|
return result; |
} |
|
#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \ |
ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING) |
|
static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
unsigned long long *sta) |
{ |
acpi_status status; |
acpi_object_type acpi_type; |
|
status = acpi_get_type(handle, &acpi_type); |
if (ACPI_FAILURE(status)) |
return -ENODEV; |
|
switch (acpi_type) { |
case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
case ACPI_TYPE_DEVICE: |
*type = ACPI_BUS_TYPE_DEVICE; |
status = acpi_bus_get_status_handle(handle, sta); |
if (ACPI_FAILURE(status)) |
return -ENODEV; |
break; |
case ACPI_TYPE_PROCESSOR: |
*type = ACPI_BUS_TYPE_PROCESSOR; |
status = acpi_bus_get_status_handle(handle, sta); |
if (ACPI_FAILURE(status)) |
return -ENODEV; |
break; |
case ACPI_TYPE_THERMAL: |
*type = ACPI_BUS_TYPE_THERMAL; |
*sta = ACPI_STA_DEFAULT; |
break; |
case ACPI_TYPE_POWER: |
*type = ACPI_BUS_TYPE_POWER; |
*sta = ACPI_STA_DEFAULT; |
break; |
default: |
return -ENODEV; |
} |
|
return 0; |
} |
|
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, |
void *context, void **return_value) |
{ |
struct acpi_bus_ops *ops = context; |
int type; |
unsigned long long sta; |
struct acpi_device *device; |
acpi_status status; |
int result; |
|
result = acpi_bus_type_and_status(handle, &type, &sta); |
if (result) |
return AE_OK; |
|
if (!(sta & ACPI_STA_DEVICE_PRESENT) && |
!(sta & ACPI_STA_DEVICE_FUNCTIONING)) |
return AE_CTRL_DEPTH; |
|
/* |
* We may already have an acpi_device from a previous enumeration. If |
* so, we needn't add it again, but we may still have to start it. |
*/ |
device = NULL; |
acpi_bus_get_device(handle, &device); |
if (ops->acpi_op_add && !device) |
acpi_add_single_object(&device, handle, type, sta, ops); |
|
if (!device) |
return AE_CTRL_DEPTH; |
|
if (ops->acpi_op_start && !(ops->acpi_op_add)) { |
status = acpi_start_single_object(device); |
if (ACPI_FAILURE(status)) |
return AE_CTRL_DEPTH; |
} |
|
if (!*return_value) |
*return_value = device; |
return AE_OK; |
} |
|
static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops, |
struct acpi_device **child) |
{ |
acpi_status status; |
void *device = NULL; |
|
status = acpi_bus_check_add(handle, 0, ops, &device); |
if (ACPI_SUCCESS(status)) |
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
acpi_bus_check_add, NULL, ops, &device); |
|
if (child) |
*child = device; |
|
if (device) |
return 0; |
else |
return -ENODEV; |
} |
|
/* |
* acpi_bus_add and acpi_bus_start |
* |
* scan a given ACPI tree and (probably recently hot-plugged) |
* create and add or starts found devices. |
* |
* If no devices were found -ENODEV is returned which does not |
* mean that this is a real error, there just have been no suitable |
* ACPI objects in the table trunk from which the kernel could create |
* a device and add/start an appropriate driver. |
*/ |
|
int |
acpi_bus_add(struct acpi_device **child, |
struct acpi_device *parent, acpi_handle handle, int type) |
{ |
struct acpi_bus_ops ops; |
|
memset(&ops, 0, sizeof(ops)); |
ops.acpi_op_add = 1; |
|
return acpi_bus_scan(handle, &ops, child); |
} |
EXPORT_SYMBOL(acpi_bus_add); |
|
int acpi_bus_start(struct acpi_device *device) |
{ |
struct acpi_bus_ops ops; |
|
if (!device) |
return -EINVAL; |
|
memset(&ops, 0, sizeof(ops)); |
ops.acpi_op_start = 1; |
|
return acpi_bus_scan(device->handle, &ops, NULL); |
} |
EXPORT_SYMBOL(acpi_bus_start); |
|
int acpi_bus_trim(struct acpi_device *start, int rmdevice) |
{ |
acpi_status status; |
struct acpi_device *parent, *child; |
acpi_handle phandle, chandle; |
acpi_object_type type; |
u32 level = 1; |
int err = 0; |
|
parent = start; |
phandle = start->handle; |
child = chandle = NULL; |
|
while ((level > 0) && parent && (!err)) { |
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, |
chandle, &chandle); |
|
/* |
* If this scope is exhausted then move our way back up. |
*/ |
if (ACPI_FAILURE(status)) { |
level--; |
chandle = phandle; |
acpi_get_parent(phandle, &phandle); |
child = parent; |
parent = parent->parent; |
|
if (level == 0) |
err = acpi_bus_remove(child, rmdevice); |
else |
err = acpi_bus_remove(child, 1); |
|
continue; |
} |
|
status = acpi_get_type(chandle, &type); |
if (ACPI_FAILURE(status)) { |
continue; |
} |
/* |
* If there is a device corresponding to chandle then |
* parse it (depth-first). |
*/ |
if (acpi_bus_get_device(chandle, &child) == 0) { |
level++; |
phandle = chandle; |
chandle = NULL; |
parent = child; |
} |
continue; |
} |
return err; |
} |
EXPORT_SYMBOL_GPL(acpi_bus_trim); |
|
static int acpi_bus_scan_fixed(void) |
{ |
int result = 0; |
struct acpi_device *device = NULL; |
struct acpi_bus_ops ops; |
|
memset(&ops, 0, sizeof(ops)); |
ops.acpi_op_add = 1; |
ops.acpi_op_start = 1; |
|
/* |
* Enumerate all fixed-feature devices. |
*/ |
if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { |
result = acpi_add_single_object(&device, NULL, |
ACPI_BUS_TYPE_POWER_BUTTON, |
ACPI_STA_DEFAULT, |
&ops); |
} |
|
if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { |
result = acpi_add_single_object(&device, NULL, |
ACPI_BUS_TYPE_SLEEP_BUTTON, |
ACPI_STA_DEFAULT, |
&ops); |
} |
|
return result; |
} |
|
int __init acpi_scan_init(void) |
{ |
int result; |
struct acpi_bus_ops ops; |
|
memset(&ops, 0, sizeof(ops)); |
ops.acpi_op_add = 1; |
ops.acpi_op_start = 1; |
|
result = bus_register(&acpi_bus_type); |
if (result) { |
/* We don't want to quit even if we failed to add suspend/resume */ |
printk(KERN_ERR PREFIX "Could not register bus type\n"); |
} |
|
/* |
* Enumerate devices in the ACPI namespace. |
*/ |
result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root); |
|
if (!result) |
result = acpi_bus_scan_fixed(); |
|
if (result) |
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); |
|
return result; |
} |