/* * scan.c - support for transforming the ACPI namespace into individual objects */ #include #include #include #include #include #include #include #include #include #include #include "internal.h" #define _COMPONENT ACPI_BUS_COMPONENT ACPI_MODULE_NAME("scan"); 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) #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) /* * If set, devices will be hot-removed even if they cannot be put offline * gracefully (from the kernel's standpoint). */ bool acpi_force_hot_remove; static const char *dummy_hid = "device"; static LIST_HEAD(acpi_dep_list); static DEFINE_MUTEX(acpi_dep_list_lock); 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); static DEFINE_MUTEX(acpi_hp_context_lock); struct acpi_dep_data { struct list_head node; acpi_handle master; acpi_handle slave; }; 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); void acpi_lock_hp_context(void) { mutex_lock(&acpi_hp_context_lock); } void acpi_unlock_hp_context(void) { mutex_unlock(&acpi_hp_context_lock); } void acpi_initialize_hp_context(struct acpi_device *adev, struct acpi_hotplug_context *hp, int (*notify)(struct acpi_device *, u32), void (*uevent)(struct acpi_device *, u32)) { acpi_lock_hp_context(); hp->notify = notify; hp->uevent = uevent; acpi_set_hp_context(adev, hp); acpi_unlock_hp_context(); } EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); int acpi_scan_add_handler(struct acpi_scan_handler *handler) { if (!handler) return -EINVAL; list_add_tail(&handler->list_node, &acpi_scan_handlers_list); return 0; } int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, const char *hotplug_profile_name) { int error; error = acpi_scan_add_handler(handler); if (error) return error; acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); return 0; } /** * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent * @acpi_dev: ACPI device object. * @modalias: Buffer to print into. * @size: Size of the buffer. * * 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" * Return: 0: no _HID and no _CID * -EINVAL: output error * -ENOMEM: output is truncated */ static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias, int size) { int len; int count; struct acpi_hardware_id *id; /* * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the * device's list. */ count = 0; list_for_each_entry(id, &acpi_dev->pnp.ids, list) if (strcmp(id->id, ACPI_DT_NAMESPACE_HID)) count++; if (!count) return 0; len = snprintf(modalias, size, "acpi:"); if (len <= 0) return len; size -= len; list_for_each_entry(id, &acpi_dev->pnp.ids, list) { if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID)) continue; count = snprintf(&modalias[len], size, "%s:", id->id); if (count < 0) return -EINVAL; if (count >= size) return -ENOMEM; len += count; size -= count; } modalias[len] = '\0'; return len; } /** * create_of_modalias - Creates DT compatible string for modalias and uevent * @acpi_dev: ACPI device object. * @modalias: Buffer to print into. * @size: Size of the buffer. * * Expose DT compatible modalias as of:NnameTCcompatible. This function should * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of * ACPI/PNP IDs. */ static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, int size) { struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; const union acpi_object *of_compatible, *obj; int len, count; int i, nval; char *c; acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf); /* DT strings are all in lower case */ for (c = buf.pointer; *c != '\0'; c++) *c = tolower(*c); len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); ACPI_FREE(buf.pointer); if (len <= 0) return len; of_compatible = acpi_dev->data.of_compatible; if (of_compatible->type == ACPI_TYPE_PACKAGE) { nval = of_compatible->package.count; obj = of_compatible->package.elements; } else { /* Must be ACPI_TYPE_STRING. */ nval = 1; obj = of_compatible; } for (i = 0; i < nval; i++, obj++) { count = snprintf(&modalias[len], size, "C%s", obj->string.pointer); if (count < 0) return -EINVAL; if (count >= size) return -ENOMEM; len += count; size -= count; } modalias[len] = '\0'; return len; } /* * acpi_companion_match() - Can we match via ACPI companion device * @dev: Device in question * * Check if the given device has an ACPI companion and if that companion has * a valid list of PNP IDs, and if the device is the first (primary) physical * device associated with it. Return the companion pointer if that's the case * or NULL otherwise. * * If multiple physical devices are attached to a single ACPI companion, we need * to be careful. The usage scenario for this kind of relationship is that all * of the physical devices in question use resources provided by the ACPI * companion. A typical case is an MFD device where all the sub-devices share * the parent's ACPI companion. In such cases we can only allow the primary * (first) physical device to be matched with the help of the companion's PNP * IDs. * * Additional physical devices sharing the ACPI companion can still use * resources available from it but they will be matched normally using functions * provided by their bus types (and analogously for their modalias). */ static struct acpi_device *acpi_companion_match(const struct device *dev) { struct acpi_device *adev; struct mutex *physical_node_lock; adev = ACPI_COMPANION(dev); if (!adev) return NULL; if (list_empty(&adev->pnp.ids)) return NULL; physical_node_lock = &adev->physical_node_lock; mutex_lock(physical_node_lock); if (list_empty(&adev->physical_node_list)) { adev = NULL; } else { const struct acpi_device_physical_node *node; node = list_first_entry(&adev->physical_node_list, struct acpi_device_physical_node, node); if (node->dev != dev) adev = NULL; } mutex_unlock(physical_node_lock); return adev; } static int __acpi_device_uevent_modalias(struct acpi_device *adev, struct kobj_uevent_env *env) { int len; if (!adev) return -ENODEV; if (list_empty(&adev->pnp.ids)) return 0; if (add_uevent_var(env, "MODALIAS=")) return -ENOMEM; len = create_pnp_modalias(adev, &env->buf[env->buflen - 1], sizeof(env->buf) - env->buflen); if (len < 0) return len; env->buflen += len; if (!adev->data.of_compatible) return 0; if (len > 0 && add_uevent_var(env, "MODALIAS=")) return -ENOMEM; len = create_of_modalias(adev, &env->buf[env->buflen - 1], sizeof(env->buf) - env->buflen); if (len < 0) return len; env->buflen += len; return 0; } /* * Creates uevent modalias field for ACPI enumerated devices. * Because the other buses does not support ACPI HIDs & CIDs. * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: * "acpi:IBM0001:ACPI0001" */ int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) { return __acpi_device_uevent_modalias(acpi_companion_match(dev), env); } EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size) { int len, count; if (!adev) return -ENODEV; if (list_empty(&adev->pnp.ids)) return 0; len = create_pnp_modalias(adev, buf, size - 1); if (len < 0) { return len; } else if (len > 0) { buf[len++] = '\n'; size -= len; } if (!adev->data.of_compatible) return len; count = create_of_modalias(adev, buf + len, size - 1); if (count < 0) { return count; } else if (count > 0) { len += count; buf[len++] = '\n'; } return len; } /* * Creates modalias sysfs attribute for ACPI enumerated devices. * Because the other buses does not support ACPI HIDs & CIDs. * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: * "acpi:IBM0001:ACPI0001" */ int acpi_device_modalias(struct device *dev, char *buf, int size) { return __acpi_device_modalias(acpi_companion_match(dev), buf, size); } EXPORT_SYMBOL_GPL(acpi_device_modalias); static ssize_t acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { return __acpi_device_modalias(to_acpi_device(dev), buf, 1024); } static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) { struct acpi_device_physical_node *pn; bool offline = true; /* * acpi_container_offline() calls this for all of the container's * children under the container's physical_node_lock lock. */ mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); list_for_each_entry(pn, &adev->physical_node_list, node) if (device_supports_offline(pn->dev) && !pn->dev->offline) { if (uevent) kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); offline = false; break; } mutex_unlock(&adev->physical_node_lock); return offline; } static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, void **ret_p) { struct acpi_device *device = NULL; struct acpi_device_physical_node *pn; bool second_pass = (bool)data; acpi_status status = AE_OK; if (acpi_bus_get_device(handle, &device)) return AE_OK; if (device->handler && !device->handler->hotplug.enabled) { *ret_p = &device->dev; return AE_SUPPORT; } mutex_lock(&device->physical_node_lock); list_for_each_entry(pn, &device->physical_node_list, node) { int ret; if (second_pass) { /* Skip devices offlined by the first pass. */ if (pn->put_online) continue; } else { pn->put_online = false; } ret = device_offline(pn->dev); if (acpi_force_hot_remove) continue; if (ret >= 0) { pn->put_online = !ret; } else { *ret_p = pn->dev; if (second_pass) { status = AE_ERROR; break; } } } mutex_unlock(&device->physical_node_lock); return status; } static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, void **ret_p) { struct acpi_device *device = NULL; struct acpi_device_physical_node *pn; if (acpi_bus_get_device(handle, &device)) return AE_OK; mutex_lock(&device->physical_node_lock); list_for_each_entry(pn, &device->physical_node_list, node) if (pn->put_online) { device_online(pn->dev); pn->put_online = false; } mutex_unlock(&device->physical_node_lock); return AE_OK; } static int acpi_scan_try_to_offline(struct acpi_device *device) { acpi_handle handle = device->handle; struct device *errdev = NULL; acpi_status status; /* * Carry out two passes here and ignore errors in the first pass, * because if the devices in question are memory blocks and * CONFIG_MEMCG is set, one of the blocks may hold data structures * that the other blocks depend on, but it is not known in advance which * block holds them. * * If the first pass is successful, the second one isn't needed, though. */ status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, NULL, acpi_bus_offline, (void *)false, (void **)&errdev); if (status == AE_SUPPORT) { dev_warn(errdev, "Offline disabled.\n"); acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_online, NULL, NULL, NULL); return -EPERM; } acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); if (errdev) { errdev = NULL; acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, NULL, acpi_bus_offline, (void *)true, (void **)&errdev); if (!errdev || acpi_force_hot_remove) acpi_bus_offline(handle, 0, (void *)true, (void **)&errdev); if (errdev && !acpi_force_hot_remove) { dev_warn(errdev, "Offline failed.\n"); acpi_bus_online(handle, 0, NULL, NULL); acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_online, NULL, NULL, NULL); return -EBUSY; } } return 0; } static int acpi_scan_hot_remove(struct acpi_device *device) { acpi_handle handle = device->handle; unsigned long long sta; acpi_status status; if (device->handler && device->handler->hotplug.demand_offline && !acpi_force_hot_remove) { if (!acpi_scan_is_offline(device, true)) return -EBUSY; } else { int error = acpi_scan_try_to_offline(device); if (error) return error; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Hot-removing device %s...\n", dev_name(&device->dev))); acpi_bus_trim(device); acpi_evaluate_lck(handle, 0); /* * TBD: _EJD support. */ status = acpi_evaluate_ej0(handle); if (status == AE_NOT_FOUND) return -ENODEV; else if (ACPI_FAILURE(status)) return -EIO; /* * Verify if eject was indeed successful. If not, log an error * message. No need to call _OST since _EJ0 call was made OK. */ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); if (ACPI_FAILURE(status)) { acpi_handle_warn(handle, "Status check after eject failed (0x%x)\n", status); } else if (sta & ACPI_STA_DEVICE_ENABLED) { acpi_handle_warn(handle, "Eject incomplete - status 0x%llx\n", sta); } return 0; } static int acpi_scan_device_not_present(struct acpi_device *adev) { if (!acpi_device_enumerated(adev)) { dev_warn(&adev->dev, "Still not present\n"); return -EALREADY; } acpi_bus_trim(adev); return 0; } static int acpi_scan_device_check(struct acpi_device *adev) { int error; acpi_bus_get_status(adev); if (adev->status.present || adev->status.functional) { /* * This function is only called for device objects for which * matching scan handlers exist. The only situation in which * the scan handler is not attached to this device object yet * is when the device has just appeared (either it wasn't * present at all before or it was removed and then added * again). */ if (adev->handler) { dev_warn(&adev->dev, "Already enumerated\n"); return -EALREADY; } error = acpi_bus_scan(adev->handle); if (error) { dev_warn(&adev->dev, "Namespace scan failure\n"); return error; } if (!adev->handler) { dev_warn(&adev->dev, "Enumeration failure\n"); error = -ENODEV; } } else { error = acpi_scan_device_not_present(adev); } return error; } static int acpi_scan_bus_check(struct acpi_device *adev) { struct acpi_scan_handler *handler = adev->handler; struct acpi_device *child; int error; acpi_bus_get_status(adev); if (!(adev->status.present || adev->status.functional)) { acpi_scan_device_not_present(adev); return 0; } if (handler && handler->hotplug.scan_dependent) return handler->hotplug.scan_dependent(adev); error = acpi_bus_scan(adev->handle); if (error) { dev_warn(&adev->dev, "Namespace scan failure\n"); return error; } list_for_each_entry(child, &adev->children, node) { error = acpi_scan_bus_check(child); if (error) return error; } return 0; } static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) { switch (type) { case ACPI_NOTIFY_BUS_CHECK: return acpi_scan_bus_check(adev); case ACPI_NOTIFY_DEVICE_CHECK: return acpi_scan_device_check(adev); case ACPI_NOTIFY_EJECT_REQUEST: case ACPI_OST_EC_OSPM_EJECT: if (adev->handler && !adev->handler->hotplug.enabled) { dev_info(&adev->dev, "Eject disabled\n"); return -EPERM; } acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); return acpi_scan_hot_remove(adev); } return -EINVAL; } void acpi_device_hotplug(struct acpi_device *adev, u32 src) { u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; int error = -ENODEV; lock_device_hotplug(); mutex_lock(&acpi_scan_lock); /* * The device object's ACPI handle cannot become invalid as long as we * are holding acpi_scan_lock, but it might have become invalid before * that lock was acquired. */ if (adev->handle == INVALID_ACPI_HANDLE) goto err_out; if (adev->flags.is_dock_station) { error = dock_notify(adev, src); } else if (adev->flags.hotplug_notify) { error = acpi_generic_hotplug_event(adev, src); if (error == -EPERM) { ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; goto err_out; } } else { int (*notify)(struct acpi_device *, u32); acpi_lock_hp_context(); notify = adev->hp ? adev->hp->notify : NULL; acpi_unlock_hp_context(); /* * There may be additional notify handlers for device objects * without the .event() callback, so ignore them here. */ if (notify) error = notify(adev, src); else goto out; } if (!error) ost_code = ACPI_OST_SC_SUCCESS; err_out: acpi_evaluate_ost(adev->handle, src, ost_code, NULL); out: acpi_bus_put_acpi_device(adev); mutex_unlock(&acpi_scan_lock); unlock_device_hotplug(); } 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) { struct acpi_device *acpi_device = to_acpi_device(d); acpi_object_type not_used; acpi_status status; if (!count || buf[0] != '1') return -EINVAL; if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) && !acpi_device->driver) return -ENODEV; status = acpi_get_type(acpi_device->handle, ¬_used); if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) return -ENODEV; get_device(&acpi_device->dev); status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT); if (ACPI_SUCCESS(status)) return count; put_device(&acpi_device->dev); acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; } 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); acpi_status status; unsigned long long sun; status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); if (ACPI_FAILURE(status)) return -ENODEV; return sprintf(buf, "%llu\n", sun); } static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); static ssize_t status_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); acpi_status status; unsigned long long sta; status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); if (ACPI_FAILURE(status)) return -ENODEV; return sprintf(buf, "%llu\n", sta); } static DEVICE_ATTR_RO(status); static int acpi_device_setup_files(struct acpi_device *dev) { struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; acpi_status status; 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 */ if (acpi_has_method(dev->handle, "_STR")) { 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->pnp.type.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); if (acpi_has_method(dev->handle, "_SUN")) { result = device_create_file(&dev->dev, &dev_attr_sun); if (result) goto end; } if (acpi_has_method(dev->handle, "_STA")) { result = device_create_file(&dev->dev, &dev_attr_status); if (result) goto end; } /* * If device has _EJ0, 'eject' file is created that is used to trigger * hot-removal function from userland. */ if (acpi_has_method(dev->handle, "_EJ0")) { 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) { 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 */ if (acpi_has_method(dev->handle, "_STR")) { kfree(dev->pnp.str_obj); device_remove_file(&dev->dev, &dev_attr_description); } /* * If device has _EJ0, remove 'eject' file. */ if (acpi_has_method(dev->handle, "_EJ0")) device_remove_file(&dev->dev, &dev_attr_eject); if (acpi_has_method(dev->handle, "_SUN")) device_remove_file(&dev->dev, &dev_attr_sun); if (dev->pnp.unique_id) device_remove_file(&dev->dev, &dev_attr_uid); if (dev->pnp.type.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 (acpi_has_method(dev->handle, "_STA")) device_remove_file(&dev->dev, &dev_attr_status); if (dev->handle) device_remove_file(&dev->dev, &dev_attr_path); } /* -------------------------------------------------------------------------- ACPI Bus operations -------------------------------------------------------------------------- */ /** * acpi_of_match_device - Match device object using the "compatible" property. * @adev: ACPI device object to match. * @of_match_table: List of device IDs to match against. * * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of * identifiers and a _DSD object with the "compatible" property, use that * property to match against the given list of identifiers. */ static bool acpi_of_match_device(struct acpi_device *adev, const struct of_device_id *of_match_table) { const union acpi_object *of_compatible, *obj; int i, nval; if (!adev) return false; of_compatible = adev->data.of_compatible; if (!of_match_table || !of_compatible) return false; if (of_compatible->type == ACPI_TYPE_PACKAGE) { nval = of_compatible->package.count; obj = of_compatible->package.elements; } else { /* Must be ACPI_TYPE_STRING. */ nval = 1; obj = of_compatible; } /* Now we can look for the driver DT compatible strings */ for (i = 0; i < nval; i++, obj++) { const struct of_device_id *id; for (id = of_match_table; id->compatible[0]; id++) if (!strcasecmp(obj->string.pointer, id->compatible)) return true; } return false; } static const struct acpi_device_id *__acpi_match_device( struct acpi_device *device, const struct acpi_device_id *ids, const struct of_device_id *of_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 || !device->status.present) return NULL; list_for_each_entry(hwid, &device->pnp.ids, list) { /* First, check the ACPI/PNP IDs provided by the caller. */ for (id = ids; id->id[0]; id++) if (!strcmp((char *) id->id, hwid->id)) return id; /* * Next, check ACPI_DT_NAMESPACE_HID and try to match the * "compatible" property if found. * * The id returned by the below is not valid, but the only * caller passing non-NULL of_ids here is only interested in * whether or not the return value is NULL. */ if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id) && acpi_of_match_device(device, of_ids)) 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) { return __acpi_match_device(acpi_companion_match(dev), ids, NULL); } 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, NULL) ? 0 : -ENOENT; } EXPORT_SYMBOL(acpi_match_device_ids); bool acpi_driver_match_device(struct device *dev, const struct device_driver *drv) { if (!drv->acpi_match_table) return acpi_of_match_device(ACPI_COMPANION(dev), drv->of_match_table); return !!__acpi_match_device(acpi_companion_match(dev), drv->acpi_match_table, drv->of_match_table); } EXPORT_SYMBOL_GPL(acpi_driver_match_device); 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->power.flags.power_resources) 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_properties(acpi_dev); acpi_free_pnp_ids(&acpi_dev->pnp); 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) { return __acpi_device_uevent_modalias(to_acpi_device(dev), env); } static void acpi_device_notify(acpi_handle handle, u32 event, void *data) { struct acpi_device *device = data; device->driver->ops.notify(device, event); } static void 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); } static u32 acpi_device_fixed_event(void *data) { acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); return ACPI_INTERRUPT_HANDLED; } 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_fixed_event, device); else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) status = acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, acpi_device_fixed_event, 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_fixed_event); else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, acpi_device_fixed_event); else acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, acpi_device_notify); } 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; if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) return -EINVAL; if (!acpi_drv->ops.add) return -ENOSYS; ret = acpi_drv->ops.add(acpi_dev); if (ret) return ret; acpi_dev->driver = acpi_drv; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver [%s] successfully bound to device [%s]\n", acpi_drv->name, acpi_dev->pnp.bus_id)); 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 0; } 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, }; static void acpi_device_del(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_power_add_remove_device(device, false); acpi_device_remove_files(device); if (device->remove) device->remove(device); device_del(&device->dev); } static LIST_HEAD(acpi_device_del_list); static DEFINE_MUTEX(acpi_device_del_lock); static void acpi_device_del_work_fn(struct work_struct *work_not_used) { for (;;) { struct acpi_device *adev; mutex_lock(&acpi_device_del_lock); if (list_empty(&acpi_device_del_list)) { mutex_unlock(&acpi_device_del_lock); break; } adev = list_first_entry(&acpi_device_del_list, struct acpi_device, del_list); list_del(&adev->del_list); mutex_unlock(&acpi_device_del_lock); acpi_device_del(adev); /* * Drop references to all power resources that might have been * used by the device. */ acpi_power_transition(adev, ACPI_STATE_D3_COLD); put_device(&adev->dev); } } /** * acpi_scan_drop_device - Drop an ACPI device object. * @handle: Handle of an ACPI namespace node, not used. * @context: Address of the ACPI device object to drop. * * This is invoked by acpi_ns_delete_node() during the removal of the ACPI * namespace node the device object pointed to by @context is attached to. * * The unregistration is carried out asynchronously to avoid running * acpi_device_del() under the ACPICA's namespace mutex and the list is used to * ensure the correct ordering (the device objects must be unregistered in the * same order in which the corresponding namespace nodes are deleted). */ static void acpi_scan_drop_device(acpi_handle handle, void *context) { static DECLARE_WORK(work, acpi_device_del_work_fn); struct acpi_device *adev = context; mutex_lock(&acpi_device_del_lock); /* * Use the ACPI hotplug workqueue which is ordered, so this work item * won't run after any hotplug work items submitted subsequently. That * prevents attempts to register device objects identical to those being * deleted from happening concurrently (such attempts result from * hotplug events handled via the ACPI hotplug workqueue). It also will * run after all of the work items submitted previosuly, which helps * those work items to ensure that they are not accessing stale device * objects. */ if (list_empty(&acpi_device_del_list)) acpi_queue_hotplug_work(&work); list_add_tail(&adev->del_list, &acpi_device_del_list); /* Make acpi_ns_validate_handle() return NULL for this handle. */ adev->handle = INVALID_ACPI_HANDLE; mutex_unlock(&acpi_device_del_lock); } static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, void (*callback)(void *)) { acpi_status status; if (!device) return -EINVAL; status = acpi_get_data_full(handle, acpi_scan_drop_device, (void **)device, callback); if (ACPI_FAILURE(status) || !*device) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", handle)); return -ENODEV; } return 0; } int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) { return acpi_get_device_data(handle, device, NULL); } EXPORT_SYMBOL(acpi_bus_get_device); static void get_acpi_device(void *dev) { if (dev) get_device(&((struct acpi_device *)dev)->dev); } struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) { struct acpi_device *adev = NULL; acpi_get_device_data(handle, &adev, get_acpi_device); return adev; } void acpi_bus_put_acpi_device(struct acpi_device *adev) { put_device(&adev->dev); } 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_scan_drop_device, 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); INIT_LIST_HEAD(&device->del_list); mutex_init(&device->physical_node_lock); 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)); 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_scan_drop_device); return result; } struct acpi_device *acpi_get_next_child(struct device *dev, struct acpi_device *child) { struct acpi_device *adev = ACPI_COMPANION(dev); struct list_head *head, *next; if (!adev) return NULL; head = &adev->children; if (list_empty(head)) return NULL; if (!child) return list_first_entry(head, struct acpi_device, node); next = child->node.next; return next == head ? NULL : list_entry(next, struct acpi_device, node); } /* -------------------------------------------------------------------------- Driver Management -------------------------------------------------------------------------- */ /** * 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 ACPI 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); 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; } } out: kfree(buffer.pointer); return err; } static void acpi_wakeup_gpe_init(struct acpi_device *device) { static const struct acpi_device_id button_device_ids[] = { {"PNP0C0C", 0}, {"PNP0C0D", 0}, {"PNP0C0E", 0}, {"", 0}, }; struct acpi_device_wakeup *wakeup = &device->wakeup; acpi_status status; acpi_event_status event_status; wakeup->flags.notifier_present = 0; /* Power button, Lid switch always enable wakeup */ if (!acpi_match_device_ids(device, button_device_ids)) { 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 (wakeup->sleep_state == ACPI_STATE_S5) wakeup->sleep_state = ACPI_STATE_S4; } acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); device_set_wakeup_capable(&device->dev, true); return; } acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, wakeup->gpe_number); status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, &event_status); if (ACPI_FAILURE(status)) return; wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); } static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) { int err; /* Presence of _PRW indicates wake capable */ if (!acpi_has_method(device->handle, "_PRW")) 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_wakeup_gpe_init(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_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'; if (acpi_has_method(device->handle, pathname)) 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) { u32 i; /* Presence of _PS0|_PR0 indicates 'power manageable' */ if (!acpi_has_method(device->handle, "_PS0") && !acpi_has_method(device->handle, "_PR0")) return; device->flags.power_manageable = 1; /* * Power Management Flags */ if (acpi_has_method(device->handle, "_PSC")) device->power.flags.explicit_get = 1; if (acpi_has_method(device->handle, "_IRC")) device->power.flags.inrush_current = 1; if (acpi_has_method(device->handle, "_DSW")) device->power.flags.dsw_present = 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_COLD].flags.valid = 1; device->power.states[ACPI_STATE_D3_COLD].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)) device->flags.power_manageable = 0; } static void acpi_bus_get_flags(struct acpi_device *device) { /* Presence of _STA indicates 'dynamic_status' */ if (acpi_has_method(device->handle, "_STA")) device->flags.dynamic_status = 1; /* Presence of _RMV indicates 'removable' */ if (acpi_has_method(device->handle, "_RMV")) device->flags.removable = 1; /* Presence of _EJD|_EJ0 indicates 'ejectable' */ if (acpi_has_method(device->handle, "_EJD") || acpi_has_method(device->handle, "_EJ0")) 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_ata_match - see if an acpi object is an ATA device * * If an acpi object has one of the ACPI ATA methods defined, * then we can safely call it an ATA device. */ bool acpi_ata_match(acpi_handle handle) { return acpi_has_method(handle, "_GTF") || acpi_has_method(handle, "_GTM") || acpi_has_method(handle, "_STM") || acpi_has_method(handle, "_SDD"); } /* * acpi_bay_match - see if an acpi object 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 */ bool acpi_bay_match(acpi_handle handle) { acpi_handle phandle; if (!acpi_has_method(handle, "_EJ0")) return false; if (acpi_ata_match(handle)) return true; if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) return false; return acpi_ata_match(phandle); } bool acpi_device_is_battery(struct acpi_device *adev) { struct acpi_hardware_id *hwid; list_for_each_entry(hwid, &adev->pnp.ids, list) if (!strcmp("PNP0C0A", hwid->id)) return true; return false; } static bool is_ejectable_bay(struct acpi_device *adev) { acpi_handle handle = adev->handle; if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) return true; return acpi_bay_match(handle); } /* * acpi_dock_match - see if an acpi object has a _DCK method */ bool acpi_dock_match(acpi_handle handle) { return acpi_has_method(handle, "_DCK"); } static acpi_status acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, void **return_value) { long *cap = context; if (acpi_has_method(handle, "_BCM") && acpi_has_method(handle, "_BCL")) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " "support\n")); *cap |= ACPI_VIDEO_BACKLIGHT; if (!acpi_has_method(handle, "_BQC")) printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, " "cannot determine initial brightness\n"); /* We have backlight support, no need to scan further */ return AE_CTRL_TERMINATE; } return 0; } /* Returns true if the ACPI object is a video device which can be * handled by video.ko. * The device will get a Linux specific CID added in scan.c to * identify the device as an ACPI graphics device * Be aware that the graphics device may not be physically present * Use acpi_video_get_capabilities() to detect general ACPI video * capabilities of present cards */ long acpi_is_video_device(acpi_handle handle) { long video_caps = 0; /* Is this device able to support video switching ? */ if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; /* Is this device able to retrieve a video ROM ? */ if (acpi_has_method(handle, "_ROM")) video_caps |= ACPI_VIDEO_ROM_AVAILABLE; /* Is this device able to configure which video head to be POSTed ? */ if (acpi_has_method(handle, "_VPO") && acpi_has_method(handle, "_GPD") && acpi_has_method(handle, "_SPD")) video_caps |= ACPI_VIDEO_DEVICE_POSTING; /* Only check for backlight functionality if one of the above hit. */ if (video_caps) acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, &video_caps, NULL); return video_caps; } EXPORT_SYMBOL(acpi_is_video_device); 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_pnp *pnp, 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, &pnp->ids); pnp->type.hardware_id = 1; } /* * 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 bool acpi_ibm_smbus_match(acpi_handle handle) { char node_name[ACPI_PATH_SEGMENT_LENGTH]; struct acpi_buffer path = { sizeof(node_name), node_name }; if (!dmi_name_in_vendors("IBM")) return false; /* Look for SMBS object */ if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || strcmp("SMBS", path.pointer)) return false; /* Does it have the necessary (but misnamed) methods? */ if (acpi_has_method(handle, "SBI") && acpi_has_method(handle, "SBR") && acpi_has_method(handle, "SBW")) return true; return false; } static bool acpi_object_is_system_bus(acpi_handle handle) { acpi_handle tmp; if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && tmp == handle) return true; if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && tmp == handle) return true; return false; } static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, int device_type) { acpi_status status; struct acpi_device_info *info; struct acpi_pnp_device_id_list *cid_list; int i; switch (device_type) { case ACPI_BUS_TYPE_DEVICE: if (handle == ACPI_ROOT_OBJECT) { acpi_add_id(pnp, ACPI_SYSTEM_HID); break; } status = acpi_get_object_info(handle, &info); if (ACPI_FAILURE(status)) { pr_err(PREFIX "%s: Error reading device info\n", __func__); return; } if (info->valid & ACPI_VALID_HID) { acpi_add_id(pnp, info->hardware_id.string); pnp->type.platform_id = 1; } if (info->valid & ACPI_VALID_CID) { cid_list = &info->compatible_id_list; for (i = 0; i < cid_list->count; i++) acpi_add_id(pnp, cid_list->ids[i].string); } if (info->valid & ACPI_VALID_ADR) { pnp->bus_address = info->address; pnp->type.bus_address = 1; } if (info->valid & ACPI_VALID_UID) 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(handle)) acpi_add_id(pnp, ACPI_VIDEO_HID); else if (acpi_bay_match(handle)) acpi_add_id(pnp, ACPI_BAY_HID); else if (acpi_dock_match(handle)) acpi_add_id(pnp, ACPI_DOCK_HID); else if (acpi_ibm_smbus_match(handle)) acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); else if (list_empty(&pnp->ids) && acpi_object_is_system_bus(handle)) { /* \_SB, \_TZ, LNXSYBUS */ acpi_add_id(pnp, ACPI_BUS_HID); strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); strcpy(pnp->device_class, ACPI_BUS_CLASS); } break; case ACPI_BUS_TYPE_POWER: acpi_add_id(pnp, ACPI_POWER_HID); break; case ACPI_BUS_TYPE_PROCESSOR: acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); break; case ACPI_BUS_TYPE_THERMAL: acpi_add_id(pnp, ACPI_THERMAL_HID); break; case ACPI_BUS_TYPE_POWER_BUTTON: acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); break; case ACPI_BUS_TYPE_SLEEP_BUTTON: acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); break; } } void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) { struct acpi_hardware_id *id, *tmp; list_for_each_entry_safe(id, tmp, &pnp->ids, list) { kfree(id->id); kfree(id); } kfree(pnp->unique_id); } 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); device->fwnode.type = FWNODE_ACPI; acpi_set_device_status(device, sta); acpi_device_get_busid(device); acpi_set_pnp_ids(handle, &device->pnp, type); acpi_init_properties(device); acpi_bus_get_flags(device); device->flags.match_driver = false; device->flags.initialized = true; device->flags.visited = false; device_initialize(&device->dev); dev_set_uevent_suppress(&device->dev, true); } void acpi_device_add_finalize(struct acpi_device *device) { 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; } bool acpi_device_is_present(struct acpi_device *adev) { if (adev->status.present || adev->status.functional) return true; adev->flags.initialized = false; return false; } static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, char *idstr, const struct acpi_device_id **matchid) { const struct acpi_device_id *devid; if (handler->match) return handler->match(idstr, matchid); for (devid = handler->ids; devid->id[0]; devid++) if (!strcmp((char *)devid->id, idstr)) { if (matchid) *matchid = devid; return true; } return false; } static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, const struct acpi_device_id **matchid) { struct acpi_scan_handler *handler; list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) if (acpi_scan_handler_matching(handler, idstr, matchid)) return handler; return NULL; } void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) { if (!!hotplug->enabled == !!val) return; mutex_lock(&acpi_scan_lock); hotplug->enabled = val; mutex_unlock(&acpi_scan_lock); } static void acpi_scan_init_hotplug(struct acpi_device *adev) { struct acpi_hardware_id *hwid; if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { acpi_dock_add(adev); return; } list_for_each_entry(hwid, &adev->pnp.ids, list) { struct acpi_scan_handler *handler; handler = acpi_scan_match_handler(hwid->id, NULL); if (handler) { adev->flags.hotplug_notify = true; break; } } } static void acpi_device_dep_initialize(struct acpi_device *adev) { struct acpi_dep_data *dep; struct acpi_handle_list dep_devices; acpi_status status; int i; if (!acpi_has_method(adev->handle, "_DEP")) return; status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, &dep_devices); if (ACPI_FAILURE(status)) { dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); return; } for (i = 0; i < dep_devices.count; i++) { struct acpi_device_info *info; int skip; status = acpi_get_object_info(dep_devices.handles[i], &info); if (ACPI_FAILURE(status)) { dev_dbg(&adev->dev, "Error reading _DEP device info\n"); continue; } /* * Skip the dependency of Windows System Power * Management Controller */ skip = info->valid & ACPI_VALID_HID && !strcmp(info->hardware_id.string, "INT3396"); kfree(info); if (skip) continue; dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); if (!dep) return; dep->master = dep_devices.handles[i]; dep->slave = adev->handle; adev->dep_unmet++; mutex_lock(&acpi_dep_list_lock); list_add_tail(&dep->node , &acpi_dep_list); mutex_unlock(&acpi_dep_list_lock); } } 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; 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; } acpi_add_single_object(&device, handle, type, sta); if (!device) return AE_CTRL_DEPTH; acpi_scan_init_hotplug(device); acpi_device_dep_initialize(device); out: if (!*return_value) *return_value = device; return AE_OK; } static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) { bool *is_spi_i2c_slave_p = data; if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) return 1; /* * devices that are connected to UART still need to be enumerated to * platform bus */ if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) *is_spi_i2c_slave_p = true; /* no need to do more checking */ return -1; } static void acpi_default_enumeration(struct acpi_device *device) { struct list_head resource_list; bool is_spi_i2c_slave = false; /* * Do not enemerate SPI/I2C slaves as they will be enuerated by their * respective parents. */ INIT_LIST_HEAD(&resource_list); acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, &is_spi_i2c_slave); acpi_dev_free_resource_list(&resource_list); if (!is_spi_i2c_slave) acpi_create_platform_device(device); } static const struct acpi_device_id generic_device_ids[] = { {ACPI_DT_NAMESPACE_HID, }, {"", }, }; static int acpi_generic_device_attach(struct acpi_device *adev, const struct acpi_device_id *not_used) { /* * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test * below can be unconditional. */ if (adev->data.of_compatible) acpi_default_enumeration(adev); return 1; } static struct acpi_scan_handler generic_device_handler = { .ids = generic_device_ids, .attach = acpi_generic_device_attach, }; 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) { const struct acpi_device_id *devid; struct acpi_scan_handler *handler; handler = acpi_scan_match_handler(hwid->id, &devid); if (handler) { if (!handler->attach) { device->pnp.type.platform_id = 0; continue; } device->handler = handler; ret = handler->attach(device, devid); if (ret > 0) break; device->handler = NULL; if (ret < 0) break; } } return ret; } static void acpi_bus_attach(struct acpi_device *device) { struct acpi_device *child; acpi_handle ejd; int ret; if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) register_dock_dependent_device(device, ejd); acpi_bus_get_status(device); /* Skip devices that are not present. */ if (!acpi_device_is_present(device)) { device->flags.visited = false; device->flags.power_manageable = 0; return; } if (device->handler) goto ok; if (!device->flags.initialized) { device->flags.power_manageable = device->power.states[ACPI_STATE_D0].flags.valid; if (acpi_bus_init_power(device)) device->flags.power_manageable = 0; device->flags.initialized = true; } device->flags.visited = false; ret = acpi_scan_attach_handler(device); if (ret < 0) return; device->flags.match_driver = true; if (!ret) { ret = device_attach(&device->dev); if (ret < 0) return; if (!ret && device->pnp.type.platform_id) acpi_default_enumeration(device); } device->flags.visited = true; ok: list_for_each_entry(child, &device->children, node) acpi_bus_attach(child); if (device->handler && device->handler->hotplug.notify_online) device->handler->hotplug.notify_online(device); } void acpi_walk_dep_device_list(acpi_handle handle) { struct acpi_dep_data *dep, *tmp; struct acpi_device *adev; mutex_lock(&acpi_dep_list_lock); list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { if (dep->master == handle) { acpi_bus_get_device(dep->slave, &adev); if (!adev) continue; adev->dep_unmet--; if (!adev->dep_unmet) acpi_bus_attach(adev); list_del(&dep->node); kfree(dep); } } mutex_unlock(&acpi_dep_list_lock); } EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); /** * 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; 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) { acpi_bus_attach(device); return 0; } return -ENODEV; } EXPORT_SYMBOL(acpi_bus_scan); /** * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. * @adev: Root of the ACPI namespace scope to walk. * * Must be called under acpi_scan_lock. */ void acpi_bus_trim(struct acpi_device *adev) { struct acpi_scan_handler *handler = adev->handler; struct acpi_device *child; list_for_each_entry_reverse(child, &adev->children, node) acpi_bus_trim(child); adev->flags.match_driver = false; if (handler) { if (handler->detach) handler->detach(adev); adev->handler = NULL; } else { device_release_driver(&adev->dev); } /* * Most likely, the device is going away, so put it into D3cold before * that. */ acpi_device_set_power(adev, ACPI_STATE_D3_COLD); adev->flags.initialized = false; adev->flags.visited = false; } 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; device->flags.match_driver = true; 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; device->flags.match_driver = true; 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_processor_init(); acpi_lpss_init(); acpi_apd_init(); acpi_cmos_rtc_init(); acpi_container_init(); acpi_memory_hotplug_init(); acpi_pnp_init(); acpi_int340x_thermal_init(); acpi_scan_add_handler(&generic_device_handler); 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; /* Fixed feature devices do not exist on HW-reduced platform */ if (!acpi_gbl_reduced_hardware) { result = acpi_bus_scan_fixed(); if (result) { acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); acpi_device_del(acpi_root); put_device(&acpi_root->dev); goto out; } } acpi_update_all_gpes(); out: mutex_unlock(&acpi_scan_lock); return result; }