| /* |
| * scan.c - support for transforming the ACPI namespace into individual objects |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/acpi.h> |
| |
| #include <acpi/acpi_drivers.h> |
| #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */ |
| |
| #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" |
| |
| static LIST_HEAD(acpi_device_list); |
| static LIST_HEAD(acpi_bus_id_list); |
| DEFINE_SPINLOCK(acpi_device_lock); |
| LIST_HEAD(acpi_wakeup_device_list); |
| |
| struct acpi_device_bus_id{ |
| char bus_id[15]; |
| unsigned int instance_no; |
| struct list_head node; |
| }; |
| |
| /* |
| * Creates hid/cid(s) string needed for modalias and uevent |
| * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: |
| * char *modalias: "acpi:IBM0001:ACPI0001" |
| */ |
| static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
| int size) |
| { |
| int len; |
| |
| if (!acpi_dev->flags.hardware_id) |
| return -ENODEV; |
| |
| len = snprintf(modalias, size, "acpi:%s:", |
| acpi_dev->pnp.hardware_id); |
| if (len < 0 || len >= size) |
| return -EINVAL; |
| size -= len; |
| |
| if (acpi_dev->flags.compatible_ids) { |
| struct acpi_compatible_id_list *cid_list; |
| int i; |
| int count; |
| |
| cid_list = acpi_dev->pnp.cid_list; |
| for (i = 0; i < cid_list->count; i++) { |
| count = snprintf(&modalias[len], size, "%s:", |
| cid_list->id[i].value); |
| if (count < 0 || count >= size) { |
| printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size", |
| acpi_dev->pnp.device_name, i); |
| break; |
| } |
| 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 int acpi_eject_operation(acpi_handle handle, int lockable) |
| { |
| struct acpi_object_list arg_list; |
| union acpi_object arg; |
| acpi_status status = AE_OK; |
| |
| /* |
| * TBD: evaluate _PS3? |
| */ |
| |
| if (lockable) { |
| arg_list.count = 1; |
| arg_list.pointer = &arg; |
| arg.type = ACPI_TYPE_INTEGER; |
| arg.integer.value = 0; |
| acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); |
| } |
| |
| arg_list.count = 1; |
| arg_list.pointer = &arg; |
| arg.type = ACPI_TYPE_INTEGER; |
| arg.integer.value = 1; |
| |
| /* |
| * TBD: _EJD support. |
| */ |
| |
| status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); |
| if (ACPI_FAILURE(status)) { |
| return (-ENODEV); |
| } |
| |
| return (0); |
| } |
| |
| static ssize_t |
| acpi_eject_store(struct device *d, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int result; |
| int ret = count; |
| int islockable; |
| acpi_status status; |
| acpi_handle handle; |
| acpi_object_type type = 0; |
| struct acpi_device *acpi_device = to_acpi_device(d); |
| |
| if ((!count) || (buf[0] != '1')) { |
| return -EINVAL; |
| } |
| #ifndef FORCE_EJECT |
| if (acpi_device->driver == NULL) { |
| ret = -ENODEV; |
| goto err; |
| } |
| #endif |
| status = acpi_get_type(acpi_device->handle, &type); |
| if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { |
| ret = -ENODEV; |
| goto err; |
| } |
| |
| islockable = acpi_device->flags.lockable; |
| handle = acpi_device->handle; |
| |
| result = acpi_bus_trim(acpi_device, 1); |
| |
| if (!result) |
| result = acpi_eject_operation(handle, islockable); |
| |
| if (result) { |
| ret = -EBUSY; |
| } |
| err: |
| return ret; |
| } |
| |
| static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
| |
| static ssize_t |
| acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| |
| return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id); |
| } |
| static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
| |
| static ssize_t |
| acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; |
| int result; |
| |
| result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
| if(result) |
| goto end; |
| |
| result = sprintf(buf, "%s\n", (char*)path.pointer); |
| kfree(path.pointer); |
| end: |
| return result; |
| } |
| static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
| |
| static int acpi_device_setup_files(struct acpi_device *dev) |
| { |
| acpi_status status; |
| acpi_handle temp; |
| int result = 0; |
| |
| /* |
| * Devices gotten from FADT don't have a "path" attribute |
| */ |
| if(dev->handle) { |
| result = device_create_file(&dev->dev, &dev_attr_path); |
| if(result) |
| goto end; |
| } |
| |
| if(dev->flags.hardware_id) { |
| result = device_create_file(&dev->dev, &dev_attr_hid); |
| if(result) |
| goto end; |
| } |
| |
| if (dev->flags.hardware_id || dev->flags.compatible_ids){ |
| result = device_create_file(&dev->dev, &dev_attr_modalias); |
| if(result) |
| goto end; |
| } |
| |
| /* |
| * If device has _EJ0, 'eject' file is created that is used to trigger |
| * hot-removal function from userland. |
| */ |
| status = acpi_get_handle(dev->handle, "_EJ0", &temp); |
| if (ACPI_SUCCESS(status)) |
| result = device_create_file(&dev->dev, &dev_attr_eject); |
| end: |
| return result; |
| } |
| |
| static void acpi_device_remove_files(struct acpi_device *dev) |
| { |
| acpi_status status; |
| acpi_handle temp; |
| |
| /* |
| * If device has _EJ0, 'eject' file is created that is used to trigger |
| * hot-removal function from userland. |
| */ |
| status = acpi_get_handle(dev->handle, "_EJ0", &temp); |
| if (ACPI_SUCCESS(status)) |
| device_remove_file(&dev->dev, &dev_attr_eject); |
| |
| if (dev->flags.hardware_id || dev->flags.compatible_ids) |
| device_remove_file(&dev->dev, &dev_attr_modalias); |
| |
| if(dev->flags.hardware_id) |
| device_remove_file(&dev->dev, &dev_attr_hid); |
| if(dev->handle) |
| device_remove_file(&dev->dev, &dev_attr_path); |
| } |
| /* -------------------------------------------------------------------------- |
| ACPI Bus operations |
| -------------------------------------------------------------------------- */ |
| |
| int acpi_match_device_ids(struct acpi_device *device, |
| const struct acpi_device_id *ids) |
| { |
| const struct acpi_device_id *id; |
| |
| if (device->flags.hardware_id) { |
| for (id = ids; id->id[0]; id++) { |
| if (!strcmp((char*)id->id, device->pnp.hardware_id)) |
| return 0; |
| } |
| } |
| |
| if (device->flags.compatible_ids) { |
| struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; |
| int i; |
| |
| for (id = ids; id->id[0]; id++) { |
| /* compare multiple _CID entries against driver ids */ |
| for (i = 0; i < cid_list->count; i++) { |
| if (!strcmp((char*)id->id, |
| cid_list->id[i].value)) |
| return 0; |
| } |
| } |
| } |
| |
| return -ENOENT; |
| } |
| EXPORT_SYMBOL(acpi_match_device_ids); |
| |
| static void acpi_device_release(struct device *dev) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| |
| kfree(acpi_dev->pnp.cid_list); |
| kfree(acpi_dev); |
| } |
| |
| static int acpi_device_suspend(struct device *dev, pm_message_t state) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_driver *acpi_drv = acpi_dev->driver; |
| |
| if (acpi_drv && acpi_drv->ops.suspend) |
| return acpi_drv->ops.suspend(acpi_dev, state); |
| return 0; |
| } |
| |
| static int acpi_device_resume(struct device *dev) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_driver *acpi_drv = acpi_dev->driver; |
| |
| if (acpi_drv && acpi_drv->ops.resume) |
| return acpi_drv->ops.resume(acpi_dev); |
| return 0; |
| } |
| |
| static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_driver *acpi_drv = to_acpi_driver(drv); |
| |
| return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
| } |
| |
| static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| int len; |
| |
| if (add_uevent_var(env, "MODALIAS=")) |
| return -ENOMEM; |
| len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], |
| sizeof(env->buf) - env->buflen); |
| if (len >= (sizeof(env->buf) - env->buflen)) |
| return -ENOMEM; |
| env->buflen += len; |
| return 0; |
| } |
| |
| static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); |
| static int acpi_start_single_object(struct acpi_device *); |
| static int acpi_device_probe(struct device * dev) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
| int ret; |
| |
| ret = acpi_bus_driver_init(acpi_dev, acpi_drv); |
| if (!ret) { |
| if (acpi_dev->bus_ops.acpi_op_start) |
| acpi_start_single_object(acpi_dev); |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Found driver [%s] for device [%s]\n", |
| acpi_drv->name, acpi_dev->pnp.bus_id)); |
| get_device(dev); |
| } |
| return ret; |
| } |
| |
| static int acpi_device_remove(struct device * dev) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_driver *acpi_drv = acpi_dev->driver; |
| |
| if (acpi_drv) { |
| if (acpi_drv->ops.stop) |
| acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type); |
| if (acpi_drv->ops.remove) |
| acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); |
| } |
| acpi_dev->driver = NULL; |
| acpi_driver_data(dev) = NULL; |
| |
| put_device(dev); |
| return 0; |
| } |
| |
| static void acpi_device_shutdown(struct device *dev) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_driver *acpi_drv = acpi_dev->driver; |
| |
| if (acpi_drv && acpi_drv->ops.shutdown) |
| acpi_drv->ops.shutdown(acpi_dev); |
| |
| return ; |
| } |
| |
| struct bus_type acpi_bus_type = { |
| .name = "acpi", |
| .suspend = acpi_device_suspend, |
| .resume = acpi_device_resume, |
| .shutdown = acpi_device_shutdown, |
| .match = acpi_bus_match, |
| .probe = acpi_device_probe, |
| .remove = acpi_device_remove, |
| .uevent = acpi_device_uevent, |
| }; |
| |
| static int acpi_device_register(struct acpi_device *device, |
| struct acpi_device *parent) |
| { |
| int result; |
| struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
| int found = 0; |
| /* |
| * Linkage |
| * ------- |
| * Link this device to its parent and siblings. |
| */ |
| INIT_LIST_HEAD(&device->children); |
| INIT_LIST_HEAD(&device->node); |
| INIT_LIST_HEAD(&device->g_list); |
| INIT_LIST_HEAD(&device->wakeup_list); |
| |
| new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
| if (!new_bus_id) { |
| printk(KERN_ERR PREFIX "Memory allocation error\n"); |
| return -ENOMEM; |
| } |
| |
| spin_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, device->flags.hardware_id? device->pnp.hardware_id : "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, device->flags.hardware_id ? device->pnp.hardware_id : "device"); |
| acpi_device_bus_id->instance_no = 0; |
| list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); |
| } |
| sprintf(device->dev.bus_id, "%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); |
| list_add_tail(&device->g_list, &device->parent->g_list); |
| } else |
| list_add_tail(&device->g_list, &acpi_device_list); |
| if (device->wakeup.flags.valid) |
| list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); |
| spin_unlock(&acpi_device_lock); |
| |
| if (device->parent) |
| device->dev.parent = &parent->dev; |
| device->dev.bus = &acpi_bus_type; |
| device_initialize(&device->dev); |
| device->dev.release = &acpi_device_release; |
| result = device_add(&device->dev); |
| if(result) { |
| printk("Error adding device %s", device->dev.bus_id); |
| goto end; |
| } |
| |
| result = acpi_device_setup_files(device); |
| if(result) |
| ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id)); |
| |
| device->removal_type = ACPI_BUS_REMOVAL_NORMAL; |
| return 0; |
| end: |
| spin_lock(&acpi_device_lock); |
| if (device->parent) { |
| list_del(&device->node); |
| list_del(&device->g_list); |
| } else |
| list_del(&device->g_list); |
| list_del(&device->wakeup_list); |
| spin_unlock(&acpi_device_lock); |
| return result; |
| } |
| |
| static void acpi_device_unregister(struct acpi_device *device, int type) |
| { |
| spin_lock(&acpi_device_lock); |
| if (device->parent) { |
| list_del(&device->node); |
| list_del(&device->g_list); |
| } else |
| list_del(&device->g_list); |
| |
| list_del(&device->wakeup_list); |
| spin_unlock(&acpi_device_lock); |
| |
| acpi_detach_data(device->handle, acpi_bus_data_handler); |
| |
| acpi_device_remove_files(device); |
| device_unregister(&device->dev); |
| } |
| |
| /* -------------------------------------------------------------------------- |
| Driver Management |
| -------------------------------------------------------------------------- */ |
| /** |
| * acpi_bus_driver_init - add a device to a driver |
| * @device: the device to add and initialize |
| * @driver: driver for the device |
| * |
| * Used to initialize a device via its device driver. Called whenever a |
| * driver is bound to a device. Invokes the driver's add() ops. |
| */ |
| static int |
| acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) |
| { |
| int result = 0; |
| |
| |
| if (!device || !driver) |
| return -EINVAL; |
| |
| if (!driver->ops.add) |
| return -ENOSYS; |
| |
| result = driver->ops.add(device); |
| if (result) { |
| device->driver = NULL; |
| acpi_driver_data(device) = NULL; |
| return result; |
| } |
| |
| device->driver = driver; |
| |
| /* |
| * TBD - Configuration Management: Assign resources to device based |
| * upon possible configuration and currently allocated resources. |
| */ |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Driver successfully bound to device\n")); |
| return 0; |
| } |
| |
| static int acpi_start_single_object(struct acpi_device *device) |
| { |
| int result = 0; |
| struct acpi_driver *driver; |
| |
| |
| if (!(driver = device->driver)) |
| return 0; |
| |
| if (driver->ops.start) { |
| result = driver->ops.start(device); |
| if (result && driver->ops.remove) |
| driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * acpi_bus_register_driver - register a driver with the ACPI bus |
| * @driver: driver being registered |
| * |
| * Registers a driver with the ACPI bus. Searches the namespace for all |
| * devices that match the driver's criteria and binds. Returns zero for |
| * success or a negative error status for failure. |
| */ |
| int acpi_bus_register_driver(struct acpi_driver *driver) |
| { |
| int ret; |
| |
| if (acpi_disabled) |
| return -ENODEV; |
| driver->drv.name = driver->name; |
| driver->drv.bus = &acpi_bus_type; |
| driver->drv.owner = driver->owner; |
| |
| ret = driver_register(&driver->drv); |
| return ret; |
| } |
| |
| EXPORT_SYMBOL(acpi_bus_register_driver); |
| |
| /** |
| * acpi_bus_unregister_driver - unregisters a driver with the APIC bus |
| * @driver: driver to unregister |
| * |
| * Unregisters a driver with the ACPI bus. Searches the namespace for all |
| * devices that match the driver's criteria and unbinds. |
| */ |
| void acpi_bus_unregister_driver(struct acpi_driver *driver) |
| { |
| driver_unregister(&driver->drv); |
| } |
| |
| EXPORT_SYMBOL(acpi_bus_unregister_driver); |
| |
| /* -------------------------------------------------------------------------- |
| Device Enumeration |
| -------------------------------------------------------------------------- */ |
| 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(NULL, obj->string.pointer, ejd); |
| kfree(buffer.pointer); |
| } |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); |
| |
| void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) |
| { |
| |
| /* TBD */ |
| |
| return; |
| } |
| |
| static int acpi_bus_get_perf_flags(struct acpi_device *device) |
| { |
| device->performance.state = ACPI_STATE_UNKNOWN; |
| return 0; |
| } |
| |
| static acpi_status |
| acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, |
| union acpi_object *package) |
| { |
| int i = 0; |
| union acpi_object *element = NULL; |
| |
| if (!device || !package || (package->package.count < 2)) |
| return AE_BAD_PARAMETER; |
| |
| element = &(package->package.elements[0]); |
| if (!element) |
| return AE_BAD_PARAMETER; |
| if (element->type == ACPI_TYPE_PACKAGE) { |
| if ((element->package.count < 2) || |
| (element->package.elements[0].type != |
| ACPI_TYPE_LOCAL_REFERENCE) |
| || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
| return AE_BAD_DATA; |
| device->wakeup.gpe_device = |
| element->package.elements[0].reference.handle; |
| device->wakeup.gpe_number = |
| (u32) element->package.elements[1].integer.value; |
| } else if (element->type == ACPI_TYPE_INTEGER) { |
| device->wakeup.gpe_number = element->integer.value; |
| } else |
| return AE_BAD_DATA; |
| |
| element = &(package->package.elements[1]); |
| if (element->type != ACPI_TYPE_INTEGER) { |
| return AE_BAD_DATA; |
| } |
| device->wakeup.sleep_state = element->integer.value; |
| |
| if ((package->package.count - 2) > ACPI_MAX_HANDLES) { |
| return AE_NO_MEMORY; |
| } |
| device->wakeup.resources.count = package->package.count - 2; |
| for (i = 0; i < device->wakeup.resources.count; i++) { |
| element = &(package->package.elements[i + 2]); |
| if (element->type != ACPI_TYPE_ANY) { |
| return AE_BAD_DATA; |
| } |
| |
| device->wakeup.resources.handles[i] = element->reference.handle; |
| } |
| |
| return AE_OK; |
| } |
| |
| static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
| { |
| acpi_status status = 0; |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| union acpi_object *package = NULL; |
| |
| struct acpi_device_id button_device_ids[] = { |
| {"PNP0C0D", 0}, |
| {"PNP0C0C", 0}, |
| {"PNP0C0E", 0}, |
| {"", 0}, |
| }; |
| |
| |
| /* _PRW */ |
| status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); |
| goto end; |
| } |
| |
| package = (union acpi_object *)buffer.pointer; |
| status = acpi_bus_extract_wakeup_device_power_package(device, package); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); |
| goto end; |
| } |
| |
| kfree(buffer.pointer); |
| |
| device->wakeup.flags.valid = 1; |
| /* Power button, Lid switch always enable wakeup */ |
| if (!acpi_match_device_ids(device, button_device_ids)) |
| device->wakeup.flags.run_wake = 1; |
| |
| end: |
| if (ACPI_FAILURE(status)) |
| device->flags.wake_capable = 0; |
| return 0; |
| } |
| |
| static int acpi_bus_get_power_flags(struct acpi_device *device) |
| { |
| acpi_status status = 0; |
| acpi_handle handle = NULL; |
| u32 i = 0; |
| |
| |
| /* |
| * Power Management Flags |
| */ |
| status = acpi_get_handle(device->handle, "_PSC", &handle); |
| if (ACPI_SUCCESS(status)) |
| device->power.flags.explicit_get = 1; |
| status = acpi_get_handle(device->handle, "_IRC", &handle); |
| if (ACPI_SUCCESS(status)) |
| device->power.flags.inrush_current = 1; |
| |
| /* |
| * Enumerate supported power management states |
| */ |
| for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { |
| struct acpi_device_power_state *ps = &device->power.states[i]; |
| char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; |
| |
| /* Evaluate "_PRx" to se if power resources are referenced */ |
| acpi_evaluate_reference(device->handle, object_name, NULL, |
| &ps->resources); |
| if (ps->resources.count) { |
| device->power.flags.power_resources = 1; |
| ps->flags.valid = 1; |
| } |
| |
| /* Evaluate "_PSx" to see if we can do explicit sets */ |
| object_name[2] = 'S'; |
| status = acpi_get_handle(device->handle, object_name, &handle); |
| if (ACPI_SUCCESS(status)) { |
| ps->flags.explicit_set = 1; |
| ps->flags.valid = 1; |
| } |
| |
| /* State is valid if we have some power control */ |
| if (ps->resources.count || ps->flags.explicit_set) |
| ps->flags.valid = 1; |
| |
| ps->power = -1; /* Unknown - driver assigned */ |
| ps->latency = -1; /* Unknown - driver assigned */ |
| } |
| |
| /* Set defaults for D0 and D3 states (always valid) */ |
| device->power.states[ACPI_STATE_D0].flags.valid = 1; |
| device->power.states[ACPI_STATE_D0].power = 100; |
| device->power.states[ACPI_STATE_D3].flags.valid = 1; |
| device->power.states[ACPI_STATE_D3].power = 0; |
| |
| /* TBD: System wake support and resource requirements. */ |
| |
| device->power.state = ACPI_STATE_UNKNOWN; |
| |
| return 0; |
| } |
| |
| static int acpi_bus_get_flags(struct acpi_device *device) |
| { |
| acpi_status status = AE_OK; |
| acpi_handle temp = NULL; |
| |
| |
| /* Presence of _STA indicates 'dynamic_status' */ |
| status = acpi_get_handle(device->handle, "_STA", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.dynamic_status = 1; |
| |
| /* Presence of _CID indicates 'compatible_ids' */ |
| status = acpi_get_handle(device->handle, "_CID", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.compatible_ids = 1; |
| |
| /* Presence of _RMV indicates 'removable' */ |
| status = acpi_get_handle(device->handle, "_RMV", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.removable = 1; |
| |
| /* Presence of _EJD|_EJ0 indicates 'ejectable' */ |
| status = acpi_get_handle(device->handle, "_EJD", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.ejectable = 1; |
| else { |
| status = acpi_get_handle(device->handle, "_EJ0", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.ejectable = 1; |
| } |
| |
| /* Presence of _LCK indicates 'lockable' */ |
| status = acpi_get_handle(device->handle, "_LCK", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.lockable = 1; |
| |
| /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
| status = acpi_get_handle(device->handle, "_PS0", &temp); |
| if (ACPI_FAILURE(status)) |
| status = acpi_get_handle(device->handle, "_PR0", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.power_manageable = 1; |
| |
| /* Presence of _PRW indicates wake capable */ |
| status = acpi_get_handle(device->handle, "_PRW", &temp); |
| if (ACPI_SUCCESS(status)) |
| device->flags.wake_capable = 1; |
| |
| /* TBD: Peformance management */ |
| |
| return 0; |
| } |
| |
| static void acpi_device_get_busid(struct acpi_device *device, |
| acpi_handle handle, int type) |
| { |
| 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)? |
| */ |
| switch (type) { |
| case ACPI_BUS_TYPE_SYSTEM: |
| strcpy(device->pnp.bus_id, "ACPI"); |
| break; |
| 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(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; |
| } |
| } |
| |
| static int |
| acpi_video_bus_match(struct acpi_device *device) |
| { |
| acpi_handle h_dummy1; |
| acpi_handle h_dummy2; |
| acpi_handle h_dummy3; |
| |
| |
| if (!device) |
| return -EINVAL; |
| |
| /* Since there is no HID, CID for ACPI Video drivers, we have |
| * to check well known required nodes for each feature we support. |
| */ |
| |
| /* Does this device able to support video switching ? */ |
| if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) && |
| ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2))) |
| return 0; |
| |
| /* Does this device able to retrieve a video ROM ? */ |
| if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1))) |
| return 0; |
| |
| /* Does this device able to configure which video head to be POSTed ? */ |
| if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) && |
| ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) && |
| ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3))) |
| return 0; |
| |
| return -ENODEV; |
| } |
| |
| /* |
| * acpi_bay_match - see if a device is an ejectable driver bay |
| * |
| * If an acpi object is ejectable and has one of the ACPI ATA methods defined, |
| * then we can safely call it an ejectable drive bay |
| */ |
| static int acpi_bay_match(struct acpi_device *device){ |
| acpi_status status; |
| acpi_handle handle; |
| acpi_handle tmp; |
| acpi_handle phandle; |
| |
| handle = device->handle; |
| |
| status = acpi_get_handle(handle, "_EJ0", &tmp); |
| if (ACPI_FAILURE(status)) |
| return -ENODEV; |
| |
| if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) |
| return 0; |
| |
| if (acpi_get_parent(handle, &phandle)) |
| return -ENODEV; |
| |
| if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) |
| return 0; |
| |
| return -ENODEV; |
| } |
| |
| /* |
| * acpi_dock_match - see if a device has a _DCK method |
| */ |
| static int acpi_dock_match(struct acpi_device *device) |
| { |
| acpi_handle tmp; |
| return acpi_get_handle(device->handle, "_DCK", &tmp); |
| } |
| |
| static void acpi_device_set_id(struct acpi_device *device, |
| struct acpi_device *parent, acpi_handle handle, |
| int type) |
| { |
| struct acpi_device_info *info; |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| char *hid = NULL; |
| char *uid = NULL; |
| struct acpi_compatible_id_list *cid_list = NULL; |
| const char *cid_add = NULL; |
| acpi_status status; |
| |
| switch (type) { |
| case ACPI_BUS_TYPE_DEVICE: |
| status = acpi_get_object_info(handle, &buffer); |
| if (ACPI_FAILURE(status)) { |
| printk("%s: Error reading device info\n", __FUNCTION__); |
| return; |
| } |
| |
| info = buffer.pointer; |
| if (info->valid & ACPI_VALID_HID) |
| hid = info->hardware_id.value; |
| if (info->valid & ACPI_VALID_UID) |
| uid = info->unique_id.value; |
| if (info->valid & ACPI_VALID_CID) |
| cid_list = &info->compatibility_id; |
| if (info->valid & ACPI_VALID_ADR) { |
| device->pnp.bus_address = info->address; |
| device->flags.bus_address = 1; |
| } |
| |
| /* If we have a video/bay/dock device, add our selfdefined |
| HID to the CID list. Like that the video/bay/dock drivers |
| will get autoloaded and the device might still match |
| against another driver. |
| */ |
| if (ACPI_SUCCESS(acpi_video_bus_match(device))) |
| cid_add = ACPI_VIDEO_HID; |
| else if (ACPI_SUCCESS(acpi_bay_match(device))) |
| cid_add = ACPI_BAY_HID; |
| else if (ACPI_SUCCESS(acpi_dock_match(device))) |
| cid_add = ACPI_DOCK_HID; |
| |
| break; |
| case ACPI_BUS_TYPE_POWER: |
| hid = ACPI_POWER_HID; |
| break; |
| case ACPI_BUS_TYPE_PROCESSOR: |
| hid = ACPI_PROCESSOR_HID; |
| break; |
| case ACPI_BUS_TYPE_SYSTEM: |
| hid = ACPI_SYSTEM_HID; |
| break; |
| case ACPI_BUS_TYPE_THERMAL: |
| hid = ACPI_THERMAL_HID; |
| break; |
| case ACPI_BUS_TYPE_POWER_BUTTON: |
| hid = ACPI_BUTTON_HID_POWERF; |
| break; |
| case ACPI_BUS_TYPE_SLEEP_BUTTON: |
| hid = ACPI_BUTTON_HID_SLEEPF; |
| break; |
| } |
| |
| /* |
| * \_SB |
| * ---- |
| * Fix for the system root bus device -- the only root-level device. |
| */ |
| if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { |
| hid = ACPI_BUS_HID; |
| strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); |
| strcpy(device->pnp.device_class, ACPI_BUS_CLASS); |
| } |
| |
| if (hid) { |
| strcpy(device->pnp.hardware_id, hid); |
| device->flags.hardware_id = 1; |
| } |
| if (uid) { |
| strcpy(device->pnp.unique_id, uid); |
| device->flags.unique_id = 1; |
| } |
| if (cid_list || cid_add) { |
| struct acpi_compatible_id_list *list; |
| int size = 0; |
| int count = 0; |
| |
| if (cid_list) { |
| size = cid_list->size; |
| } else if (cid_add) { |
| size = sizeof(struct acpi_compatible_id_list); |
| cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size); |
| if (!cid_list) { |
| printk(KERN_ERR "Memory allocation error\n"); |
| kfree(buffer.pointer); |
| return; |
| } else { |
| cid_list->count = 0; |
| cid_list->size = size; |
| } |
| } |
| if (cid_add) |
| size += sizeof(struct acpi_compatible_id); |
| list = kmalloc(size, GFP_KERNEL); |
| |
| if (list) { |
| if (cid_list) { |
| memcpy(list, cid_list, cid_list->size); |
| count = cid_list->count; |
| } |
| if (cid_add) { |
| strncpy(list->id[count].value, cid_add, |
| ACPI_MAX_CID_LENGTH); |
| count++; |
| device->flags.compatible_ids = 1; |
| } |
| list->size = size; |
| list->count = count; |
| device->pnp.cid_list = list; |
| } else |
| printk(KERN_ERR "Memory allocation error\n"); |
| } |
| |
| kfree(buffer.pointer); |
| } |
| |
| static int acpi_device_set_context(struct acpi_device *device, int type) |
| { |
| acpi_status status = AE_OK; |
| int result = 0; |
| /* |
| * Context |
| * ------- |
| * Attach this 'struct acpi_device' to the ACPI object. This makes |
| * resolutions from handle->device very efficient. Note that we need |
| * to be careful with fixed-feature devices as they all attach to the |
| * root object. |
| */ |
| if (type != ACPI_BUS_TYPE_POWER_BUTTON && |
| type != ACPI_BUS_TYPE_SLEEP_BUTTON) { |
| status = acpi_attach_data(device->handle, |
| acpi_bus_data_handler, device); |
| |
| if (ACPI_FAILURE(status)) { |
| printk("Error attaching device data\n"); |
| result = -ENODEV; |
| } |
| } |
| return result; |
| } |
| |
| static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) |
| { |
| if (!dev) |
| return -EINVAL; |
| |
| dev->removal_type = ACPI_BUS_REMOVAL_EJECT; |
| device_release_driver(&dev->dev); |
| |
| if (!rmdevice) |
| return 0; |
| |
| /* |
| * unbind _ADR-Based Devices when hot removal |
| */ |
| if (dev->flags.bus_address) { |
| if ((dev->parent) && (dev->parent->ops.unbind)) |
| dev->parent->ops.unbind(dev); |
| } |
| acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); |
| |
| return 0; |
| } |
| |
| static int |
| acpi_is_child_device(struct acpi_device *device, |
| int (*matcher)(struct acpi_device *)) |
| { |
| int result = -ENODEV; |
| |
| do { |
| if (ACPI_SUCCESS(matcher(device))) |
| return AE_OK; |
| } while ((device = device->parent)); |
| |
| return result; |
| } |
| |
| static int |
| acpi_add_single_object(struct acpi_device **child, |
| struct acpi_device *parent, acpi_handle handle, int type, |
| struct acpi_bus_ops *ops) |
| { |
| int result = 0; |
| struct acpi_device *device = NULL; |
| |
| |
| if (!child) |
| return -EINVAL; |
| |
| device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
| if (!device) { |
| printk(KERN_ERR PREFIX "Memory allocation error\n"); |
| return -ENOMEM; |
| } |
| |
| device->handle = handle; |
| device->parent = parent; |
| device->bus_ops = *ops; /* workround for not call .start */ |
| |
| |
| acpi_device_get_busid(device, handle, type); |
| |
| /* |
| * Flags |
| * ----- |
| * Get prior to calling acpi_bus_get_status() so we know whether |
| * or not _STA is present. Note that we only look for object |
| * handles -- cannot evaluate objects until we know the device is |
| * present and properly initialized. |
| */ |
| result = acpi_bus_get_flags(device); |
| if (result) |
| goto end; |
| |
| /* |
| * Status |
| * ------ |
| * See if the device is present. We always assume that non-Device |
| * and non-Processor objects (e.g. thermal zones, power resources, |
| * etc.) are present, functioning, etc. (at least when parent object |
| * is present). Note that _STA has a different meaning for some |
| * objects (e.g. power resources) so we need to be careful how we use |
| * it. |
| */ |
| switch (type) { |
| case ACPI_BUS_TYPE_PROCESSOR: |
| case ACPI_BUS_TYPE_DEVICE: |
| result = acpi_bus_get_status(device); |
| if (ACPI_FAILURE(result)) { |
| result = -ENODEV; |
| goto end; |
| } |
| if (!device->status.present) { |
| /* Bay and dock should be handled even if absent */ |
| if (!ACPI_SUCCESS( |
| acpi_is_child_device(device, acpi_bay_match)) && |
| !ACPI_SUCCESS( |
| acpi_is_child_device(device, acpi_dock_match))) { |
| result = -ENODEV; |
| goto end; |
| } |
| } |
| break; |
| default: |
| STRUCT_TO_INT(device->status) = |
| ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | |
| ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; |
| break; |
| } |
| |
| /* |
| * Initialize Device |
| * ----------------- |
| * TBD: Synch with Core's enumeration/initialization process. |
| */ |
| |
| /* |
| * Hardware ID, Unique ID, & Bus Address |
| * ------------------------------------- |
| */ |
| acpi_device_set_id(device, parent, handle, type); |
| |
| /* |
| * Power Management |
| * ---------------- |
| */ |
| if (device->flags.power_manageable) { |
| result = acpi_bus_get_power_flags(device); |
| if (result) |
| goto end; |
| } |
| |
| /* |
| * Wakeup device management |
| *----------------------- |
| */ |
| if (device->flags.wake_capable) { |
| result = acpi_bus_get_wakeup_device_flags(device); |
| if (result) |
| goto end; |
| } |
| |
| /* |
| * Performance Management |
| * ---------------------- |
| */ |
| if (device->flags.performance_manageable) { |
| result = acpi_bus_get_perf_flags(device); |
| if (result) |
| goto end; |
| } |
| |
| if ((result = acpi_device_set_context(device, type))) |
| goto end; |
| |
| result = acpi_device_register(device, parent); |
| |
| /* |
| * Bind _ADR-Based Devices when hot add |
| */ |
| if (device->flags.bus_address) { |
| if (device->parent && device->parent->ops.bind) |
| device->parent->ops.bind(device); |
| } |
| |
| end: |
| if (!result) |
| *child = device; |
| else { |
| kfree(device->pnp.cid_list); |
| kfree(device); |
| } |
| |
| return result; |
| } |
| |
| static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) |
| { |
| acpi_status status = AE_OK; |
| struct acpi_device *parent = NULL; |
| struct acpi_device *child = NULL; |
| acpi_handle phandle = NULL; |
| acpi_handle chandle = NULL; |
| acpi_object_type type = 0; |
| u32 level = 1; |
| |
| |
| if (!start) |
| return -EINVAL; |
| |
| parent = start; |
| phandle = start->handle; |
| |
| /* |
| * Parse through the ACPI namespace, identify all 'devices', and |
| * create a new 'struct acpi_device' for each. |
| */ |
| while ((level > 0) && parent) { |
| |
| status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, |
| chandle, &chandle); |
| |
| /* |
| * If this scope is exhausted then move our way back up. |
| */ |
| if (ACPI_FAILURE(status)) { |
| level--; |
| chandle = phandle; |
| acpi_get_parent(phandle, &phandle); |
| if (parent->parent) |
| parent = parent->parent; |
| continue; |
| } |
| |
| status = acpi_get_type(chandle, &type); |
| if (ACPI_FAILURE(status)) |
| continue; |
| |
| /* |
| * If this is a scope object then parse it (depth-first). |
| */ |
| if (type == ACPI_TYPE_LOCAL_SCOPE) { |
| level++; |
| phandle = chandle; |
| chandle = NULL; |
| continue; |
| } |
| |
| /* |
| * We're only interested in objects that we consider 'devices'. |
| */ |
| switch (type) { |
| case ACPI_TYPE_DEVICE: |
| type = ACPI_BUS_TYPE_DEVICE; |
| break; |
| case ACPI_TYPE_PROCESSOR: |
| type = ACPI_BUS_TYPE_PROCESSOR; |
| break; |
| case ACPI_TYPE_THERMAL: |
| type = ACPI_BUS_TYPE_THERMAL; |
| break; |
| case ACPI_TYPE_POWER: |
| type = ACPI_BUS_TYPE_POWER; |
| break; |
| default: |
| continue; |
| } |
| |
| if (ops->acpi_op_add) |
| status = acpi_add_single_object(&child, parent, |
| chandle, type, ops); |
| else |
| status = acpi_bus_get_device(chandle, &child); |
| |
| if (ACPI_FAILURE(status)) |
| continue; |
| |
| if (ops->acpi_op_start && !(ops->acpi_op_add)) { |
| status = acpi_start_single_object(child); |
| if (ACPI_FAILURE(status)) |
| continue; |
| } |
| |
| /* |
| * If the device is present, enabled, and functioning then |
| * parse its scope (depth-first). Note that we need to |
| * represent absent devices to facilitate PnP notifications |
| * -- but only the subtree head (not all of its children, |
| * which will be enumerated when the parent is inserted). |
| * |
| * TBD: Need notifications and other detection mechanisms |
| * in place before we can fully implement this. |
| */ |
| if (child->status.present) { |
| status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, |
| NULL, NULL); |
| if (ACPI_SUCCESS(status)) { |
| level++; |
| phandle = chandle; |
| chandle = NULL; |
| parent = child; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| int |
| acpi_bus_add(struct acpi_device **child, |
| struct acpi_device *parent, acpi_handle handle, int type) |
| { |
| int result; |
| struct acpi_bus_ops ops; |
| |
| memset(&ops, 0, sizeof(ops)); |
| ops.acpi_op_add = 1; |
| |
| result = acpi_add_single_object(child, parent, handle, type, &ops); |
| if (!result) |
| result = acpi_bus_scan(*child, &ops); |
| |
| return result; |
| } |
| |
| EXPORT_SYMBOL(acpi_bus_add); |
| |
| int acpi_bus_start(struct acpi_device *device) |
| { |
| int result; |
| struct acpi_bus_ops ops; |
| |
| |
| if (!device) |
| return -EINVAL; |
| |
| result = acpi_start_single_object(device); |
| if (!result) { |
| memset(&ops, 0, sizeof(ops)); |
| ops.acpi_op_start = 1; |
| result = acpi_bus_scan(device, &ops); |
| } |
| return result; |
| } |
| |
| EXPORT_SYMBOL(acpi_bus_start); |
| |
| int acpi_bus_trim(struct acpi_device *start, int rmdevice) |
| { |
| acpi_status status; |
| struct acpi_device *parent, *child; |
| acpi_handle phandle, chandle; |
| acpi_object_type type; |
| u32 level = 1; |
| int err = 0; |
| |
| parent = start; |
| phandle = start->handle; |
| child = chandle = NULL; |
| |
| while ((level > 0) && parent && (!err)) { |
| status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, |
| chandle, &chandle); |
| |
| /* |
| * If this scope is exhausted then move our way back up. |
| */ |
| if (ACPI_FAILURE(status)) { |
| level--; |
| chandle = phandle; |
| acpi_get_parent(phandle, &phandle); |
| child = parent; |
| parent = parent->parent; |
| |
| if (level == 0) |
| err = acpi_bus_remove(child, rmdevice); |
| else |
| err = acpi_bus_remove(child, 1); |
| |
| continue; |
| } |
| |
| status = acpi_get_type(chandle, &type); |
| if (ACPI_FAILURE(status)) { |
| continue; |
| } |
| /* |
| * If there is a device corresponding to chandle then |
| * parse it (depth-first). |
| */ |
| if (acpi_bus_get_device(chandle, &child) == 0) { |
| level++; |
| phandle = chandle; |
| chandle = NULL; |
| parent = child; |
| } |
| continue; |
| } |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(acpi_bus_trim); |
| |
| |
| static int acpi_bus_scan_fixed(struct acpi_device *root) |
| { |
| int result = 0; |
| struct acpi_device *device = NULL; |
| struct acpi_bus_ops ops; |
| |
| if (!root) |
| return -ENODEV; |
| |
| memset(&ops, 0, sizeof(ops)); |
| ops.acpi_op_add = 1; |
| ops.acpi_op_start = 1; |
| |
| /* |
| * Enumerate all fixed-feature devices. |
| */ |
| if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { |
| result = acpi_add_single_object(&device, acpi_root, |
| NULL, |
| ACPI_BUS_TYPE_POWER_BUTTON, |
| &ops); |
| } |
| |
| if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { |
| result = acpi_add_single_object(&device, acpi_root, |
| NULL, |
| ACPI_BUS_TYPE_SLEEP_BUTTON, |
| &ops); |
| } |
| |
| return result; |
| } |
| |
| static int __init acpi_scan_init(void) |
| { |
| int result; |
| struct acpi_bus_ops ops; |
| |
| |
| if (acpi_disabled) |
| return 0; |
| |
| memset(&ops, 0, sizeof(ops)); |
| ops.acpi_op_add = 1; |
| ops.acpi_op_start = 1; |
| |
| result = bus_register(&acpi_bus_type); |
| if (result) { |
| /* We don't want to quit even if we failed to add suspend/resume */ |
| printk(KERN_ERR PREFIX "Could not register bus type\n"); |
| } |
| |
| /* |
| * Create the root device in the bus's device tree |
| */ |
| result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, |
| ACPI_BUS_TYPE_SYSTEM, &ops); |
| if (result) |
| goto Done; |
| |
| /* |
| * Enumerate devices in the ACPI namespace. |
| */ |
| result = acpi_bus_scan_fixed(acpi_root); |
| if (!result) |
| result = acpi_bus_scan(acpi_root, &ops); |
| |
| if (result) |
| acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); |
| |
| Done: |
| return result; |
| } |
| |
| subsys_initcall(acpi_scan_init); |