/* * 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 <linux/signal.h> #include <linux/kthread.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; int count; if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids) return -ENODEV; len = snprintf(modalias, size, "acpi:"); size -= len; if (acpi_dev->flags.hardware_id) { count = snprintf(&modalias[len], size, "%s:", acpi_dev->pnp.hardware_id); if (count < 0 || count >= size) return -EINVAL; len += count; size -= count; } if (acpi_dev->flags.compatible_ids) { struct acpi_compatible_id_list *cid_list; int i; 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 PREFIX "%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_bus_hot_remove_device(void *context) { struct acpi_device *device; acpi_handle handle = context; struct acpi_object_list arg_list; union acpi_object arg; acpi_status status = AE_OK; if (acpi_bus_get_device(handle, &device)) return 0; if (!device) return 0; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Hot-removing device %s...\n", dev_name(&device->dev))); if (acpi_bus_trim(device, 1)) { printk(KERN_ERR PREFIX "Removing device failed\n"); return -1; } /* power off device */ status = acpi_evaluate_object(handle, "_PS3", NULL, NULL); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) printk(KERN_WARNING PREFIX "Power-off device failed\n"); if (device->flags.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 ret = count; acpi_status status; acpi_object_type type = 0; struct acpi_device *acpi_device = to_acpi_device(d); struct task_struct *task; 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; } /* remove the device in another thread to fix the deadlock issue */ task = kthread_run(acpi_bus_hot_remove_device, acpi_device->handle, "acpi_hot_remove_device"); if (IS_ERR(task)) ret = PTR_ERR(task); 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 the device is not present, it is unnecessary to load device * driver for it. */ if (!device->status.present) return -ENODEV; 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_dev->driver_data = 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); } 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); 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) { dev_err(&device->dev, "Error adding device\n"); goto end; } result = acpi_device_setup_files(device); if(result) printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", dev_name(&device->dev)); device->removal_type = ACPI_BUS_REMOVAL_NORMAL; return 0; 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; device->driver_data = NULL; return result; } device->driver = driver; /* * TBD - Configuration Management: Assign resources to device based * upon possible configuration and currently allocated resources. */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n")); return 0; } 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(ACPI_ROOT_OBJECT, obj->string.pointer, ejd); kfree(buffer.pointer); } return status; } EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); void acpi_bus_data_handler(acpi_handle handle, 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_LOCAL_REFERENCE) 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; int psw_error; 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; /* 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. */ psw_error = acpi_device_sleep_wake(device, 0, 0, 0); if (psw_error) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in _DSW or _PSW evaluation\n")); /* 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; acpi_bus_get_power(device->handle, &(device->power.state)); 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: Performance 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; } } /* * 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(KERN_ERR PREFIX "%s: Error reading device info\n", __func__); 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_is_video_device(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_OBJECT_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 PREFIX "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(KERN_ERR PREFIX "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_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; } /* * When the device is neither present nor functional, the * device should not be added to Linux ACPI device tree. * When the status of the device is not present but functinal, * it should be added to Linux ACPI tree. For example : bay * device , dock device. * In such conditions it is unncessary to check whether it is * bay device or dock device. */ if (!device->status.present && !device->status.functional) { 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); /* * The ACPI device is attached to acpi handle before getting * the power/wakeup/peformance flags. Otherwise OS can't get * the corresponding ACPI device by the acpi handle in the course * of getting the power/wakeup/performance flags. */ result = acpi_device_set_context(device, type); if (result) goto end; /* * 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; } 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. */ /* * 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; } } } 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);