diff options
| -rw-r--r-- | drivers/acpi/scan.c | 196 |
1 files changed, 74 insertions, 122 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 0b5aaf059c9..ed2b5f9a981 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1393,123 +1393,92 @@ end: return result; } -static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops) +static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, + void *context, void **return_value) { acpi_status status = AE_OK; - struct acpi_device *parent = NULL; - struct acpi_device *child = NULL; - acpi_handle phandle = NULL; - acpi_handle chandle = NULL; + struct acpi_device *device = NULL; acpi_object_type type = 0; - u32 level = 1; - int ret; + struct acpi_bus_ops *ops = context; - /* - * We must have an acpi_device for the starting node already, and - * we scan its children. - */ - phandle = handle; - ret = acpi_bus_get_device(phandle, &parent); - if (ret) - return ret; + status = acpi_get_type(handle, &type); + if (ACPI_FAILURE(status)) + return AE_OK; /* - * Parse through the ACPI namespace, identify all 'devices', and - * create a new 'struct acpi_device' for each. + * We're only interested in objects that we consider 'devices'. */ - while ((level > 0) && parent) { + switch (type) { + case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ + 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: + return AE_OK; + } - status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, - chandle, &chandle); + if (ops->acpi_op_add) + status = acpi_add_single_object(&device, handle, type, ops); + else + status = acpi_bus_get_device(handle, &device); - /* - * 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; - } + if (ACPI_FAILURE(status)) + return AE_CTRL_DEPTH; - status = acpi_get_type(chandle, &type); + if (ops->acpi_op_start && !(ops->acpi_op_add)) { + status = acpi_start_single_object(device); 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; - } + return AE_CTRL_DEPTH; + } - /* - * 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 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. + * + * When the device is not present but functional, it is also + * necessary to scan the children of this device. + */ + if (!device->status.present && !device->status.functional) + return AE_CTRL_DEPTH; - if (ops->acpi_op_add) - status = acpi_add_single_object(&child, chandle, type, - ops); - else - status = acpi_bus_get_device(chandle, &child); + if (!*return_value) + *return_value = device; + return AE_OK; +} - if (ACPI_FAILURE(status)) - continue; +static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops, + struct acpi_device **child) +{ + acpi_status status; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + void *device = NULL; - if (ops->acpi_op_start && !(ops->acpi_op_add)) { - status = acpi_start_single_object(child); - if (ACPI_FAILURE(status)) - continue; - } + acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + printk(KERN_INFO PREFIX "Enumerating devices from [%s]\n", + (char *) buffer.pointer); - /* - * 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. - */ - /* - * When the device is not present but functional, it is also - * necessary to scan the children of this device. - */ - if (child->status.present || (!child->status.present && - child->status.functional)) { - status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, - NULL, NULL); - if (ACPI_SUCCESS(status)) { - level++; - phandle = chandle; - chandle = NULL; - parent = child; - } - } - } + status = acpi_bus_check_add(handle, 0, ops, &device); + if (ACPI_SUCCESS(status)) + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_check_add, ops, &device); + if (child) + *child = device; return 0; } @@ -1517,33 +1486,25 @@ 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, handle, type, &ops); - if (!result) - result = acpi_bus_scan((*child)->handle, &ops); - - return result; + acpi_bus_scan(handle, &ops, child); + return 0; } EXPORT_SYMBOL(acpi_bus_add); int acpi_bus_start(struct acpi_device *device) { - int result; struct acpi_bus_ops ops; memset(&ops, 0, sizeof(ops)); ops.acpi_op_start = 1; - result = acpi_start_single_object(device); - if (!result) - result = acpi_bus_scan(device->handle, &ops); - - return result; + acpi_bus_scan(device->handle, &ops, NULL); + return 0; } EXPORT_SYMBOL(acpi_bus_start); @@ -1646,17 +1607,9 @@ int __init acpi_scan_init(void) } /* - * Create the root device in the bus's device tree - */ - result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT, - ACPI_BUS_TYPE_DEVICE, &ops); - if (result) - goto Done; - - /* * Enumerate devices in the ACPI namespace. */ - result = acpi_bus_scan(acpi_root->handle, &ops); + result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root); if (!result) result = acpi_bus_scan_fixed(); @@ -1664,6 +1617,5 @@ int __init acpi_scan_init(void) if (result) acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); -Done: return result; } |