/* * 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 <linux/nls.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 const char *dummy_hid = "device"; static LIST_HEAD(acpi_device_list); static LIST_HEAD(acpi_bus_id_list); static DEFINE_MUTEX(acpi_scan_lock); static LIST_HEAD(acpi_scan_handlers_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; }; void acpi_scan_lock_acquire(void) { mutex_lock(&acpi_scan_lock); } EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); void acpi_scan_lock_release(void) { mutex_unlock(&acpi_scan_lock); } EXPORT_SYMBOL_GPL(acpi_scan_lock_release); int acpi_scan_add_handler(struct acpi_scan_handler *handler) { if (!handler || !handler->attach) return -EINVAL; list_add_tail(&handler->list_node, &acpi_scan_handlers_list); return 0; } /* * 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; if (list_empty(&acpi_dev->pnp.ids)) return 0; 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); /** * acpi_bus_hot_remove_device: hot-remove a device and its children * @context: struct acpi_eject_event pointer (freed in this func) * * Hot-remove a device and its children. This function frees up the * memory space passed by arg context, so that the caller may call * this function asynchronously through acpi_os_hotplug_execute(). */ void acpi_bus_hot_remove_device(void *context) { struct acpi_eject_event *ej_event = context; struct acpi_device *device = ej_event->device; acpi_handle handle = device->handle; acpi_handle temp; struct acpi_object_list arg_list; union acpi_object arg; acpi_status status = AE_OK; u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ mutex_lock(&acpi_scan_lock); /* If there is no handle, the device node has been unregistered. */ if (!device->handle) { dev_dbg(&device->dev, "ACPI handle missing\n"); put_device(&device->dev); goto out; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Hot-removing device %s...\n", dev_name(&device->dev))); acpi_bus_trim(device); /* Device node has been unregistered. */ put_device(&device->dev); device = NULL; if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) { 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)) { if (status != AE_NOT_FOUND) acpi_handle_warn(handle, "Eject failed\n"); /* Tell the firmware the hot-remove operation has failed. */ acpi_evaluate_hotplug_ost(handle, ej_event->event, ost_code, NULL); } out: mutex_unlock(&acpi_scan_lock); kfree(context); return; } EXPORT_SYMBOL(acpi_bus_hot_remove_device); static ssize_t real_power_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *adev = to_acpi_device(dev); int state; int ret; ret = acpi_device_get_power(adev, &state); if (ret) return ret; return sprintf(buf, "%s\n", acpi_power_state_string(state)); } static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); static ssize_t power_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *adev = to_acpi_device(dev); return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); } static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); 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); struct acpi_eject_event *ej_event; if ((!count) || (buf[0] != '1')) { return -EINVAL; } if (!acpi_device->driver && !acpi_device->handler) { ret = -ENODEV; goto err; } status = acpi_get_type(acpi_device->handle, &type); if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { ret = -ENODEV; goto err; } ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); if (!ej_event) { ret = -ENOMEM; goto err; } get_device(&acpi_device->dev); ej_event->device = acpi_device; if (acpi_device->flags.eject_pending) { /* event originated from ACPI eject notification */ ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; acpi_device->flags.eject_pending = 0; } else { /* event originated from user */ ej_event->event = ACPI_OST_EC_OSPM_EJECT; (void) acpi_evaluate_hotplug_ost(acpi_device->handle, ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); } status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); if (ACPI_FAILURE(status)) { put_device(&acpi_device->dev); kfree(ej_event); } 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_uid_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_dev->pnp.unique_id); } static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); static ssize_t acpi_device_adr_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); return sprintf(buf, "0x%08x\n", (unsigned int)(acpi_dev->pnp.bus_address)); } static DEVICE_ATTR(adr, 0444, acpi_device_adr_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); /* sysfs file that shows description text from the ACPI _STR method */ static ssize_t description_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); int result; if (acpi_dev->pnp.str_obj == NULL) return 0; /* * The _STR object contains a Unicode identifier for a device. * We need to convert to utf-8 so it can be displayed. */ result = utf16s_to_utf8s( (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, acpi_dev->pnp.str_obj->buffer.length, UTF16_LITTLE_ENDIAN, buf, PAGE_SIZE); buf[result++] = '\n'; return result; } static DEVICE_ATTR(description, 0444, description_show, NULL); static ssize_t acpi_device_sun_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); } static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); static int acpi_device_setup_files(struct acpi_device *dev) { struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; acpi_status status; acpi_handle temp; unsigned long long sun; 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; } if (!list_empty(&dev->pnp.ids)) { 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 _STR, 'description' file is created */ status = acpi_get_handle(dev->handle, "_STR", &temp); if (ACPI_SUCCESS(status)) { status = acpi_evaluate_object(dev->handle, "_STR", NULL, &buffer); if (ACPI_FAILURE(status)) buffer.pointer = NULL; dev->pnp.str_obj = buffer.pointer; result = device_create_file(&dev->dev, &dev_attr_description); if (result) goto end; } if (dev->flags.bus_address) result = device_create_file(&dev->dev, &dev_attr_adr); if (dev->pnp.unique_id) result = device_create_file(&dev->dev, &dev_attr_uid); status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); if (ACPI_SUCCESS(status)) { dev->pnp.sun = (unsigned long)sun; result = device_create_file(&dev->dev, &dev_attr_sun); if (result) goto end; } else { dev->pnp.sun = (unsigned long)-1; } /* * 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); if (result) return result; } if (dev->flags.power_manageable) { result = device_create_file(&dev->dev, &dev_attr_power_state); if (result) return result; if (dev->power.flags.power_resources) result = device_create_file(&dev->dev, &dev_attr_real_power_state); } end: return result; } static void acpi_device_remove_files(struct acpi_device *dev) { acpi_status status; acpi_handle temp; if (dev->flags.power_manageable) { device_remove_file(&dev->dev, &dev_attr_power_state); if (dev->power.flags.power_resources) device_remove_file(&dev->dev, &dev_attr_real_power_state); } /* * If device has _STR, remove 'description' file */ status = acpi_get_handle(dev->handle, "_STR", &temp); if (ACPI_SUCCESS(status)) { kfree(dev->pnp.str_obj); device_remove_file(&dev->dev, &dev_attr_description); } /* * If device has _EJ0, remove 'eject' file. */ status = acpi_get_handle(dev->handle, "_EJ0", &temp); if (ACPI_SUCCESS(status)) device_remove_file(&dev->dev, &dev_attr_eject); status = acpi_get_handle(dev->handle, "_SUN", &temp); if (ACPI_SUCCESS(status)) device_remove_file(&dev->dev, &dev_attr_sun); if (dev->pnp.unique_id) device_remove_file(&dev->dev, &dev_attr_uid); if (dev->flags.bus_address) device_remove_file(&dev->dev, &dev_attr_adr); 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 -------------------------------------------------------------------------- */ static const struct acpi_device_id *__acpi_match_device( 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 NULL; for (id = ids; id->id[0]; id++) list_for_each_entry(hwid, &device->pnp.ids, list) if (!strcmp((char *) id->id, hwid->id)) return id; return NULL; } /** * acpi_match_device - Match a struct device against a given list of ACPI IDs * @ids: Array of struct acpi_device_id object to match against. * @dev: The device structure to match. * * Check if @dev has a valid ACPI handle and if there is a struct acpi_device * object for that handle and use that object to match against a given list of * device IDs. * * Return a pointer to the first matching ID on success or %NULL on failure. */ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, const struct device *dev) { struct acpi_device *adev; acpi_handle handle = ACPI_HANDLE(dev); if (!ids || !handle || acpi_bus_get_device(handle, &adev)) return NULL; return __acpi_match_device(adev, ids); } EXPORT_SYMBOL_GPL(acpi_match_device); int acpi_match_device_ids(struct acpi_device *device, const struct acpi_device_id *ids) { return __acpi_match_device(device, ids) ? 0 : -ENOENT; } EXPORT_SYMBOL(acpi_match_device_ids); 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); } kfree(device->pnp.unique_id); } static void acpi_free_power_resources_lists(struct acpi_device *device) { int i; if (device->wakeup.flags.valid) acpi_power_resources_list_free(&device->wakeup.resources); if (!device->flags.power_manageable) return; for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { struct acpi_device_power_state *ps = &device->power.states[i]; acpi_power_resources_list_free(&ps->resources); } } static void acpi_device_release(struct device *dev) { struct acpi_device *acpi_dev = to_acpi_device(dev); acpi_free_ids(acpi_dev); acpi_free_power_resources_lists(acpi_dev); kfree(acpi_dev); } 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_dev->flags.match_driver && !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 (list_empty(&acpi_dev->pnp.ids)) return 0; 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_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_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->driver = NULL; acpi_dev->driver_data = NULL; 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->driver = NULL; acpi_dev->driver_data = NULL; put_device(dev); return 0; } struct bus_type acpi_bus_type = { .name = "acpi", .match = acpi_bus_match, .probe = acpi_device_probe, .remove = acpi_device_remove, .uevent = acpi_device_uevent, }; int acpi_device_add(struct acpi_device *device, void (*release)(struct device *)) { int result; struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; int found = 0; if (device->handle) { acpi_status status; status = acpi_attach_data(device->handle, acpi_bus_data_handler, device); if (ACPI_FAILURE(status)) { acpi_handle_err(device->handle, "Unable to attach device data\n"); return -ENODEV; } } /* * 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); INIT_LIST_HEAD(&device->physical_node_list); mutex_init(&device->physical_node_lock); INIT_LIST_HEAD(&device->power_dependent); new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); if (!new_bus_id) { pr_err(PREFIX "Memory allocation error\n"); result = -ENOMEM; goto err_detach; } 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 = release; result = device_add(&device->dev); if (result) { dev_err(&device->dev, "Error registering device\n"); goto err; } 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; err: mutex_lock(&acpi_device_lock); if (device->parent) list_del(&device->node); list_del(&device->wakeup_list); mutex_unlock(&acpi_device_lock); err_detach: acpi_detach_data(device->handle, acpi_bus_data_handler); return result; } static void acpi_device_unregister(struct acpi_device *device) { 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_power_add_remove_device(device, false); acpi_device_remove_files(device); if (device->remove) device->remove(device); device_del(&device->dev); /* * Transition the device to D3cold to drop the reference counts of all * power resources the device depends on and turn off the ones that have * no more references. */ acpi_device_set_power(device, ACPI_STATE_D3_COLD); device->handle = NULL; put_device(&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; } /** * 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) { struct acpi_device *device = NULL; acpi_status status; /* * 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) return acpi_root; do { status = acpi_get_parent(handle, &handle); if (ACPI_FAILURE(status)) return status == AE_NULL_ENTRY ? NULL : acpi_root; } while (acpi_bus_get_device(handle, &device)); return device; } 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_extract_wakeup_device_power_package(acpi_handle handle, struct acpi_device_wakeup *wakeup) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *package = NULL; union acpi_object *element = NULL; acpi_status status; int err = -ENODATA; if (!wakeup) return -EINVAL; INIT_LIST_HEAD(&wakeup->resources); /* _PRW */ status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); return err; } package = (union acpi_object *)buffer.pointer; if (!package || package->package.count < 2) goto out; element = &(package->package.elements[0]); if (!element) goto out; 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)) goto out; wakeup->gpe_device = element->package.elements[0].reference.handle; wakeup->gpe_number = (u32) element->package.elements[1].integer.value; } else if (element->type == ACPI_TYPE_INTEGER) { wakeup->gpe_device = NULL; wakeup->gpe_number = element->integer.value; } else { goto out; } element = &(package->package.elements[1]); if (element->type != ACPI_TYPE_INTEGER) goto out; wakeup->sleep_state = element->integer.value; err = acpi_extract_power_resources(package, 2, &wakeup->resources); if (err) goto out; if (!list_empty(&wakeup->resources)) { int sleep_state; err = acpi_power_wakeup_list_init(&wakeup->resources, &sleep_state); if (err) { acpi_handle_warn(handle, "Retrieving current states " "of wakeup power resources failed\n"); acpi_power_resources_list_free(&wakeup->resources); goto out; } if (sleep_state < wakeup->sleep_state) { acpi_handle_warn(handle, "Overriding _PRW sleep state " "(S%d) by S%d from power resources\n", (int)wakeup->sleep_state, sleep_state); wakeup->sleep_state = sleep_state; } } acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); out: kfree(buffer.pointer); return err; } static void acpi_bus_set_run_wake_flags(struct acpi_device *device) { struct acpi_device_id button_device_ids[] = { {"PNP0C0C", 0}, {"PNP0C0D", 0}, {"PNP0C0E", 0}, {"", 0}, }; acpi_status status; acpi_event_status event_status; 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; if (!acpi_match_device_ids(device, &button_device_ids[1])) { /* Do not use Lid/sleep button for S5 wakeup */ if (device->wakeup.sleep_state == ACPI_STATE_S5) device->wakeup.sleep_state = ACPI_STATE_S4; } device_set_wakeup_capable(&device->dev, true); 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 void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) { acpi_handle temp; acpi_status status = 0; int err; /* Presence of _PRW indicates wake capable */ status = acpi_get_handle(device->handle, "_PRW", &temp); if (ACPI_FAILURE(status)) return; err = acpi_bus_extract_wakeup_device_power_package(device->handle, &device->wakeup); if (err) { dev_err(&device->dev, "_PRW evaluation error: %d\n", err); return; } 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. */ err = acpi_device_sleep_wake(device, 0, 0, 0); if (err) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in _DSW or _PSW evaluation\n")); } static void acpi_bus_init_power_state(struct acpi_device *device, int state) { struct acpi_device_power_state *ps = &device->power.states[state]; char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; acpi_handle handle; acpi_status status; INIT_LIST_HEAD(&ps->resources); /* Evaluate "_PRx" to get referenced power resources */ status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); if (ACPI_SUCCESS(status)) { union acpi_object *package = buffer.pointer; if (buffer.length && package && package->type == ACPI_TYPE_PACKAGE && package->package.count) { int err = acpi_extract_power_resources(package, 0, &ps->resources); if (!err) device->power.flags.power_resources = 1; } ACPI_FREE(buffer.pointer); } /* Evaluate "_PSx" to see if we can do explicit sets */ pathname[2] = 'S'; status = acpi_get_handle(device->handle, pathname, &handle); if (ACPI_SUCCESS(status)) ps->flags.explicit_set = 1; /* * State is valid if there are means to put the device into it. * D3hot is only valid if _PR3 present. */ if (!list_empty(&ps->resources) || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { ps->flags.valid = 1; ps->flags.os_accessible = 1; } ps->power = -1; /* Unknown - driver assigned */ ps->latency = -1; /* Unknown - driver assigned */ } static void acpi_bus_get_power_flags(struct acpi_device *device) { acpi_status status; acpi_handle handle; u32 i; /* Presence of _PS0|_PR0 indicates 'power manageable' */ status = acpi_get_handle(device->handle, "_PS0", &handle); if (ACPI_FAILURE(status)) { status = acpi_get_handle(device->handle, "_PR0", &handle); if (ACPI_FAILURE(status)) return; } device->flags.power_manageable = 1; /* * 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_HOT; i++) acpi_bus_init_power_state(device, i); INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); /* 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; /* Set D3cold's explicit_set flag if _PS3 exists. */ if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || device->power.flags.power_resources) device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; if (acpi_bus_init_power(device)) { acpi_free_power_resources_lists(device); device->flags.power_manageable = 0; } } static void 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; } } 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); } const char *acpi_device_hid(struct acpi_device *device) { struct acpi_hardware_id *hid; if (list_empty(&device->pnp.ids)) return dummy_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 = kstrdup(dev_id, GFP_KERNEL); if (!id->id) { kfree(id); return; } 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 acpi_pnp_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; } if (info->valid & ACPI_VALID_UID) device->pnp.unique_id = kstrdup(info->unique_id.string, GFP_KERNEL); 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 (list_empty(&device->pnp.ids) && 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; } } void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, int type, unsigned long long sta) { INIT_LIST_HEAD(&device->pnp.ids); device->device_type = type; device->handle = handle; device->parent = acpi_bus_get_parent(handle); STRUCT_TO_INT(device->status) = sta; acpi_device_get_busid(device); acpi_device_set_id(device); acpi_bus_get_flags(device); device->flags.match_driver = false; device_initialize(&device->dev); dev_set_uevent_suppress(&device->dev, true); } void acpi_device_add_finalize(struct acpi_device *device) { device->flags.match_driver = true; dev_set_uevent_suppress(&device->dev, false); kobject_uevent(&device->dev.kobj, KOBJ_ADD); } static int acpi_add_single_object(struct acpi_device **child, acpi_handle handle, int type, unsigned long long sta) { 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; } acpi_init_device_object(device, handle, type, sta); acpi_bus_get_power_flags(device); acpi_bus_get_wakeup_device_flags(device); result = acpi_device_add(device, acpi_device_release); if (result) { acpi_device_release(&device->dev); return result; } acpi_power_add_remove_device(device, true); acpi_device_add_finalize(device); acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %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; return 0; } 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_not_used, void *not_used, void **return_value) { struct acpi_device *device = NULL; int type; unsigned long long sta; acpi_status status; int result; acpi_bus_get_device(handle, &device); if (device) goto out; result = acpi_bus_type_and_status(handle, &type, &sta); if (result) return AE_OK; if (type == ACPI_BUS_TYPE_POWER) { acpi_add_power_resource(handle); return AE_OK; } if (!(sta & ACPI_STA_DEVICE_PRESENT) && !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { struct acpi_device_wakeup wakeup; acpi_handle temp; status = acpi_get_handle(handle, "_PRW", &temp); if (ACPI_SUCCESS(status)) { acpi_bus_extract_wakeup_device_power_package(handle, &wakeup); acpi_power_resources_list_free(&wakeup.resources); } return AE_CTRL_DEPTH; } acpi_add_single_object(&device, handle, type, sta); if (!device) return AE_CTRL_DEPTH; out: if (!*return_value) *return_value = device; return AE_OK; } static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id) { struct acpi_scan_handler *handler; list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) { const struct acpi_device_id *devid; for (devid = handler->ids; devid->id[0]; devid++) { int ret; if (strcmp((char *)devid->id, id)) continue; ret = handler->attach(device, devid); if (ret > 0) { device->handler = handler; return ret; } else if (ret < 0) { return ret; } } } return 0; } static int acpi_scan_attach_handler(struct acpi_device *device) { struct acpi_hardware_id *hwid; int ret = 0; list_for_each_entry(hwid, &device->pnp.ids, list) { ret = acpi_scan_do_attach_handler(device, hwid->id); if (ret) break; } return ret; } static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, void *not_used, void **ret_not_used) { struct acpi_device *device; unsigned long long sta_not_used; int ret; /* * Ignore errors ignored by acpi_bus_check_add() to avoid terminating * namespace walks prematurely. */ if (acpi_bus_type_and_status(handle, &ret, &sta_not_used)) return AE_OK; if (acpi_bus_get_device(handle, &device)) return AE_CTRL_DEPTH; ret = acpi_scan_attach_handler(device); if (ret) return ret > 0 ? AE_OK : AE_CTRL_DEPTH; ret = device_attach(&device->dev); return ret >= 0 ? AE_OK : AE_CTRL_DEPTH; } /** * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. * @handle: Root of the namespace scope to scan. * * Scan a given ACPI tree (probably recently hot-plugged) and create and add * found devices. * * If no devices were found, -ENODEV is returned, but it does not mean that * there has been 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 an * appropriate driver. * * Must be called under acpi_scan_lock. */ int acpi_bus_scan(acpi_handle handle) { void *device = NULL; int error = 0; if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_check_add, NULL, NULL, &device); if (!device) error = -ENODEV; else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_device_attach, NULL, NULL, NULL); return error; } EXPORT_SYMBOL(acpi_bus_scan); static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, void *not_used, void **ret_not_used) { struct acpi_device *device = NULL; if (!acpi_bus_get_device(handle, &device)) { struct acpi_scan_handler *dev_handler = device->handler; device->removal_type = ACPI_BUS_REMOVAL_EJECT; if (dev_handler) { if (dev_handler->detach) dev_handler->detach(device); device->handler = NULL; } else { device_release_driver(&device->dev); } } return AE_OK; } static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used, void *not_used, void **ret_not_used) { struct acpi_device *device = NULL; if (!acpi_bus_get_device(handle, &device)) acpi_device_unregister(device); return AE_OK; } /** * acpi_bus_trim - Remove ACPI device node and all of its descendants * @start: Root of the ACPI device nodes subtree to remove. * * Must be called under acpi_scan_lock. */ void acpi_bus_trim(struct acpi_device *start) { /* * Execute acpi_bus_device_detach() as a post-order callback to detach * all ACPI drivers from the device nodes being removed. */ acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, acpi_bus_device_detach, NULL, NULL); acpi_bus_device_detach(start->handle, 0, NULL, NULL); /* * Execute acpi_bus_remove() as a post-order callback to remove device * nodes in the given namespace scope. */ acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, acpi_bus_remove, NULL, NULL); acpi_bus_remove(start->handle, 0, NULL, NULL); } EXPORT_SYMBOL_GPL(acpi_bus_trim); static int acpi_bus_scan_fixed(void) { int result = 0; /* * Enumerate all fixed-feature devices. */ if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { struct acpi_device *device = NULL; result = acpi_add_single_object(&device, NULL, ACPI_BUS_TYPE_POWER_BUTTON, ACPI_STA_DEFAULT); if (result) return result; result = device_attach(&device->dev); if (result < 0) return result; device_init_wakeup(&device->dev, true); } if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { struct acpi_device *device = NULL; result = acpi_add_single_object(&device, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON, ACPI_STA_DEFAULT); if (result) return result; result = device_attach(&device->dev); } return result < 0 ? result : 0; } int __init acpi_scan_init(void) { int result; 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"); } acpi_pci_root_init(); acpi_pci_link_init(); acpi_platform_init(); acpi_csrt_init(); acpi_container_init(); mutex_lock(&acpi_scan_lock); /* * Enumerate devices in the ACPI namespace. */ result = acpi_bus_scan(ACPI_ROOT_OBJECT); if (result) goto out; result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); if (result) goto out; result = acpi_bus_scan_fixed(); if (result) { acpi_device_unregister(acpi_root); goto out; } acpi_update_all_gpes(); acpi_pci_root_hp_init(); out: mutex_unlock(&acpi_scan_lock); return result; }