| /* |
| * 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) |
| |
| /* |
| * 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_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; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * 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); |
| |
| 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_hot_remove(struct acpi_device *device) |
| { |
| acpi_handle handle = device->handle; |
| struct device *errdev; |
| acpi_status status; |
| unsigned long long sta; |
| |
| /* If there is no handle, the device node has been unregistered. */ |
| if (!handle) { |
| dev_dbg(&device->dev, "ACPI handle missing\n"); |
| put_device(&device->dev); |
| return -EINVAL; |
| } |
| |
| /* |
| * 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. |
| */ |
| errdev = NULL; |
| 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); |
| put_device(&device->dev); |
| 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); |
| put_device(&device->dev); |
| return -EBUSY; |
| } |
| } |
| |
| 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; |
| |
| 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 void acpi_bus_device_eject(struct acpi_device *device, u32 ost_src) |
| { |
| acpi_handle handle = device->handle; |
| struct acpi_scan_handler *handler; |
| u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
| int error; |
| |
| lock_device_hotplug(); |
| mutex_lock(&acpi_scan_lock); |
| |
| handler = device->handler; |
| if (!handler || !handler->hotplug.enabled) { |
| put_device(&device->dev); |
| goto err_support; |
| } |
| |
| if (ost_src == ACPI_NOTIFY_EJECT_REQUEST) |
| acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, |
| ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
| |
| if (handler->hotplug.mode == AHM_CONTAINER) |
| kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
| |
| error = acpi_scan_hot_remove(device); |
| if (error == -EPERM) { |
| goto err_support; |
| } else if (error) { |
| goto err_out; |
| } |
| |
| out: |
| mutex_unlock(&acpi_scan_lock); |
| unlock_device_hotplug(); |
| return; |
| |
| err_support: |
| ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; |
| err_out: |
| acpi_evaluate_hotplug_ost(handle, ost_src, ost_code, NULL); |
| goto out; |
| } |
| |
| static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source) |
| { |
| struct acpi_device *device = NULL; |
| u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
| int error; |
| |
| lock_device_hotplug(); |
| mutex_lock(&acpi_scan_lock); |
| |
| if (ost_source != ACPI_NOTIFY_BUS_CHECK) { |
| acpi_bus_get_device(handle, &device); |
| if (device) { |
| dev_warn(&device->dev, "Attempt to re-insert\n"); |
| goto out; |
| } |
| } |
| acpi_evaluate_hotplug_ost(handle, ost_source, |
| ACPI_OST_SC_INSERT_IN_PROGRESS, NULL); |
| error = acpi_bus_scan(handle); |
| if (error) { |
| acpi_handle_warn(handle, "Namespace scan failure\n"); |
| goto out; |
| } |
| error = acpi_bus_get_device(handle, &device); |
| if (error) { |
| acpi_handle_warn(handle, "Missing device node object\n"); |
| goto out; |
| } |
| ost_code = ACPI_OST_SC_SUCCESS; |
| if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) |
| kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); |
| |
| out: |
| acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL); |
| mutex_unlock(&acpi_scan_lock); |
| unlock_device_hotplug(); |
| } |
| |
| static void acpi_scan_bus_check(void *context) |
| { |
| acpi_scan_bus_device_check((acpi_handle)context, |
| ACPI_NOTIFY_BUS_CHECK); |
| } |
| |
| static void acpi_scan_device_check(void *context) |
| { |
| acpi_scan_bus_device_check((acpi_handle)context, |
| ACPI_NOTIFY_DEVICE_CHECK); |
| } |
| |
| static void acpi_hotplug_unsupported(acpi_handle handle, u32 type) |
| { |
| u32 ost_status; |
| |
| switch (type) { |
| case ACPI_NOTIFY_BUS_CHECK: |
| acpi_handle_debug(handle, |
| "ACPI_NOTIFY_BUS_CHECK event: unsupported\n"); |
| ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; |
| break; |
| case ACPI_NOTIFY_DEVICE_CHECK: |
| acpi_handle_debug(handle, |
| "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n"); |
| ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; |
| break; |
| case ACPI_NOTIFY_EJECT_REQUEST: |
| acpi_handle_debug(handle, |
| "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n"); |
| ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED; |
| break; |
| default: |
| /* non-hotplug event; possibly handled by other handler */ |
| return; |
| } |
| |
| acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL); |
| } |
| |
| /** |
| * acpi_bus_hot_remove_device: Hot-remove a device and its children. |
| * @context: Address of the ACPI device object to hot-remove. |
| */ |
| void acpi_bus_hot_remove_device(void *context) |
| { |
| acpi_bus_device_eject(context, ACPI_NOTIFY_EJECT_REQUEST); |
| } |
| |
| static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) |
| { |
| acpi_osd_exec_callback callback; |
| struct acpi_scan_handler *handler = data; |
| struct acpi_device *adev; |
| acpi_status status; |
| |
| if (!handler->hotplug.enabled) |
| return acpi_hotplug_unsupported(handle, type); |
| |
| switch (type) { |
| case ACPI_NOTIFY_BUS_CHECK: |
| acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); |
| callback = acpi_scan_bus_check; |
| break; |
| case ACPI_NOTIFY_DEVICE_CHECK: |
| acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); |
| callback = acpi_scan_device_check; |
| break; |
| case ACPI_NOTIFY_EJECT_REQUEST: |
| acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); |
| status = acpi_bus_get_device(handle, &adev); |
| if (ACPI_FAILURE(status)) |
| goto err_out; |
| |
| get_device(&adev->dev); |
| callback = acpi_bus_hot_remove_device; |
| status = acpi_os_hotplug_execute(callback, adev); |
| if (ACPI_SUCCESS(status)) |
| return; |
| |
| put_device(&adev->dev); |
| goto err_out; |
| default: |
| /* non-hotplug event; possibly handled by other handler */ |
| return; |
| } |
| status = acpi_os_hotplug_execute(callback, handle); |
| if (ACPI_SUCCESS(status)) |
| return; |
| |
| err_out: |
| acpi_evaluate_hotplug_ost(handle, type, |
| ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
| } |
| |
| 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 void acpi_eject_store_work(void *context) |
| { |
| acpi_bus_device_eject(context, ACPI_OST_EC_OSPM_EJECT); |
| } |
| |
| 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; |
| |
| acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
| ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
| get_device(&acpi_device->dev); |
| status = acpi_os_hotplug_execute(acpi_eject_store_work, acpi_device); |
| if (ACPI_SUCCESS(status)) |
| return count; |
| |
| put_device(&acpi_device->dev); |
| acpi_evaluate_hotplug_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); |
| |
| 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; |
| 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 |
| */ |
| 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); |
| |
| 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. |
| */ |
| 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 (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); |
| |
| 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_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) |
| { |
| 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_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) |
| 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_bus_data_handler(acpi_handle handle, void *context) |
| { |
| /* Intentionally empty. */ |
| } |
| |
| int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) |
| { |
| acpi_status status; |
| |
| if (!device) |
| return -EINVAL; |
| |
| status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); |
| if (ACPI_FAILURE(status) || !*device) { |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", |
| handle)); |
| return -ENODEV; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(acpi_bus_get_device); |
| |
| 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)); |
| |
| 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_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); |
| |
| 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) |
| { |
| 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_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_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; |
| |
| /* |
| * 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)) { |
| acpi_free_power_resources_lists(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); |
| } |
| |
| /* |
| * 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"); |
| } |
| |
| 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 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); |
| 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) && handle == ACPI_ROOT_OBJECT) { |
| acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ |
| 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); |
| STRUCT_TO_INT(device->status) = sta; |
| acpi_device_get_busid(device); |
| acpi_set_pnp_ids(handle, &device->pnp, type); |
| 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) |
| { |
| 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 bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
| char *idstr, |
| const struct acpi_device_id **matchid) |
| { |
| const struct acpi_device_id *devid; |
| |
| 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(acpi_handle handle, int type) |
| { |
| struct acpi_device_pnp pnp = {}; |
| struct acpi_hardware_id *hwid; |
| struct acpi_scan_handler *handler; |
| |
| INIT_LIST_HEAD(&pnp.ids); |
| acpi_set_pnp_ids(handle, &pnp, type); |
| |
| if (!pnp.type.hardware_id) |
| goto out; |
| |
| /* |
| * This relies on the fact that acpi_install_notify_handler() will not |
| * install the same notify handler routine twice for the same handle. |
| */ |
| list_for_each_entry(hwid, &pnp.ids, list) { |
| handler = acpi_scan_match_handler(hwid->id, NULL); |
| if (handler) { |
| acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| acpi_hotplug_notify_cb, handler); |
| break; |
| } |
| } |
| |
| out: |
| acpi_free_pnp_ids(&pnp); |
| } |
| |
| 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_scan_init_hotplug(handle, type); |
| |
| if (!(sta & ACPI_STA_DEVICE_PRESENT) && |
| !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { |
| struct acpi_device_wakeup wakeup; |
| |
| if (acpi_has_method(handle, "_PRW")) { |
| 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_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) { |
| ret = handler->attach(device, devid); |
| if (ret > 0) { |
| device->handler = handler; |
| break; |
| } else if (ret < 0) { |
| 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; |
| |
| if (device->handler) |
| return AE_OK; |
| |
| ret = acpi_scan_attach_handler(device); |
| if (ret < 0) |
| return AE_CTRL_DEPTH; |
| |
| device->flags.match_driver = true; |
| if (ret > 0) |
| return AE_OK; |
| |
| 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; |
| |
| 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_processor_init(); |
| acpi_platform_init(); |
| acpi_lpss_init(); |
| acpi_cmos_rtc_init(); |
| acpi_container_init(); |
| acpi_memory_hotplug_init(); |
| acpi_dock_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; |
| } |