3  * Device probing and sysfs code.
11 #include <linux/device.h>
158 static const struct ieee1394_device_id *unit_match(struct device *dev,  in unit_match()
174 static bool is_fw_unit(struct device *dev);
176 static int fw_unit_match(struct device *dev, struct device_driver *drv)  in fw_unit_match()
182 static int fw_unit_probe(struct device *dev)  in fw_unit_probe()
190 static int fw_unit_remove(struct device *dev)  in fw_unit_remove()
209 static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)  in fw_unit_uevent()
230 int fw_device_enable_phys_dma(struct fw_device *device)  in fw_device_enable_phys_dma()  argument
232 	int generation = device->generation;  in fw_device_enable_phys_dma()
234 	/* device->node_id, accessed below, must not be older than generation */  in fw_device_enable_phys_dma()
237 	return device->card->driver->enable_phys_dma(device->card,  in fw_device_enable_phys_dma()
238 						     device->node_id,  in fw_device_enable_phys_dma()
248 static ssize_t show_immediate(struct device *dev,  in show_immediate()
280 static ssize_t show_text_leaf(struct device *dev,  in show_text_leaf()
333 static void init_fw_attribute_group(struct device *dev,  in init_fw_attribute_group()
357 static ssize_t modalias_show(struct device *dev,  in modalias_show()
369 static ssize_t rom_index_show(struct device *dev,  in rom_index_show()
372 	struct fw_device *device = fw_device(dev->parent);  in rom_index_show()  local
376 			(int)(unit->directory - device->config_rom));  in rom_index_show()
385 static ssize_t config_rom_show(struct device *dev,  in config_rom_show()
388 	struct fw_device *device = fw_device(dev);  in config_rom_show()  local
392 	length = device->config_rom_length * 4;  in config_rom_show()
393 	memcpy(buf, device->config_rom, length);  in config_rom_show()
399 static ssize_t guid_show(struct device *dev,  in guid_show()
402 	struct fw_device *device = fw_device(dev);  in guid_show()  local
407 		       device->config_rom[3], device->config_rom[4]);  in guid_show()
413 static ssize_t is_local_show(struct device *dev,  in is_local_show()
416 	struct fw_device *device = fw_device(dev);  in is_local_show()  local
418 	return sprintf(buf, "%u\n", device->is_local);  in is_local_show()
443 static ssize_t units_show(struct device *dev,  in units_show()
446 	struct fw_device *device = fw_device(dev);  in units_show()  local
451 	fw_csr_iterator_init(&ci, &device->config_rom[5]);  in units_show()
475 static int read_rom(struct fw_device *device,  in read_rom()  argument
481 	/* device->node_id, accessed below, must not be older than generation */  in read_rom()
485 		rcode = fw_run_transaction(device->card,  in read_rom()
486 				TCODE_READ_QUADLET_REQUEST, device->node_id,  in read_rom()
487 				generation, device->max_speed, offset, data, 4);  in read_rom()
507 static int read_config_rom(struct fw_device *device, int generation)  in read_config_rom()  argument
509 	struct fw_card *card = device->card;  in read_config_rom()
523 	device->max_speed = SCODE_100;  in read_config_rom()
527 		ret = read_rom(device, generation, i, &rom[i]);  in read_config_rom()
544 	device->max_speed = device->node->max_speed;  in read_config_rom()
555 	if ((rom[2] & 0x7) < device->max_speed ||  in read_config_rom()
556 	    device->max_speed == SCODE_BETA ||  in read_config_rom()
561 		if (device->max_speed == SCODE_BETA)  in read_config_rom()
562 			device->max_speed = card->link_speed;  in read_config_rom()
564 		while (device->max_speed > SCODE_100) {  in read_config_rom()
565 			if (read_rom(device, generation, 0, &dummy) ==  in read_config_rom()
568 			device->max_speed--;  in read_config_rom()
597 		ret = read_rom(device, generation, i, &rom[i]);  in read_config_rom()
621 			ret = read_rom(device, generation, i, &rom[i]);  in read_config_rom()
648 	old_rom = device->config_rom;  in read_config_rom()
656 	device->config_rom = new_rom;  in read_config_rom()
657 	device->config_rom_length = length;  in read_config_rom()
662 	device->max_rec	= rom[2] >> 12 & 0xf;  in read_config_rom()
663 	device->cmc	= rom[2] >> 30 & 1;  in read_config_rom()
664 	device->irmc	= rom[2] >> 31 & 1;  in read_config_rom()
671 static void fw_unit_release(struct device *dev)  in fw_unit_release()
684 static bool is_fw_unit(struct device *dev)  in is_fw_unit()
689 static void create_units(struct fw_device *device)  in create_units()  argument
696 	fw_csr_iterator_init(&ci, &device->config_rom[5]);  in create_units()
710 		unit->device.bus = &fw_bus_type;  in create_units()
711 		unit->device.type = &fw_unit_type;  in create_units()
712 		unit->device.parent = &device->device;  in create_units()
713 		dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);  in create_units()
718 		init_fw_attribute_group(&unit->device,  in create_units()
722 		if (device_register(&unit->device) < 0)  in create_units()
725 		fw_device_get(device);  in create_units()
733 static int shutdown_unit(struct device *device, void *data)  in shutdown_unit()  argument
735 	device_unregister(device);  in shutdown_unit()
753 	struct fw_device *device;  in fw_device_get_by_devt()  local
756 	device = idr_find(&fw_device_idr, MINOR(devt));  in fw_device_get_by_devt()
757 	if (device)  in fw_device_get_by_devt()
758 		fw_device_get(device);  in fw_device_get_by_devt()
761 	return device;  in fw_device_get_by_devt()
767 static void fw_schedule_device_work(struct fw_device *device,  in fw_schedule_device_work()  argument
770 	queue_delayed_work(fw_workqueue, &device->work, delay);  in fw_schedule_device_work()
775  * rom.  It shouldn't be necessary to tweak these; if the device
791 	struct fw_device *device =  in fw_device_shutdown()  local
793 	int minor = MINOR(device->device.devt);  in fw_device_shutdown()
796 			  device->card->reset_jiffies + SHUTDOWN_DELAY)  in fw_device_shutdown()
797 	    && !list_empty(&device->card->link)) {  in fw_device_shutdown()
798 		fw_schedule_device_work(device, SHUTDOWN_DELAY);  in fw_device_shutdown()
802 	if (atomic_cmpxchg(&device->state,  in fw_device_shutdown()
807 	fw_device_cdev_remove(device);  in fw_device_shutdown()
808 	device_for_each_child(&device->device, NULL, shutdown_unit);  in fw_device_shutdown()
809 	device_unregister(&device->device);  in fw_device_shutdown()
815 	fw_device_put(device);  in fw_device_shutdown()
818 static void fw_device_release(struct device *dev)  in fw_device_release()
820 	struct fw_device *device = fw_device(dev);  in fw_device_release()  local
821 	struct fw_card *card = device->card;  in fw_device_release()
830 	device->node->data = NULL;  in fw_device_release()
833 	fw_node_put(device->node);  in fw_device_release()
834 	kfree(device->config_rom);  in fw_device_release()
835 	kfree(device);  in fw_device_release()
843 static bool is_fw_device(struct device *dev)  in is_fw_device()
848 static int update_unit(struct device *dev, void *data)  in update_unit()
864 	struct fw_device *device =  in fw_device_update()  local
867 	fw_device_cdev_update(device);  in fw_device_update()
868 	device_for_each_child(&device->device, NULL, update_unit);  in fw_device_update()
872  * If a device was pending for deletion because its node went away but its
874  * device, revive the existing fw_device.
877 static int lookup_existing_device(struct device *dev, void *data)  in lookup_existing_device()
907 		fw_notice(card, "rediscovered device %s\n", dev_name(dev));  in lookup_existing_device()
926 static void set_broadcast_channel(struct fw_device *device, int generation)  in set_broadcast_channel()  argument
928 	struct fw_card *card = device->card;  in set_broadcast_channel()
942 	if (!device->irmc || device->max_rec < 8)  in set_broadcast_channel()
949 	if (device->bc_implemented == BC_UNKNOWN) {  in set_broadcast_channel()
951 				device->node_id, generation, device->max_speed,  in set_broadcast_channel()
957 				device->bc_implemented = BC_IMPLEMENTED;  in set_broadcast_channel()
962 			device->bc_implemented = BC_UNIMPLEMENTED;  in set_broadcast_channel()
966 	if (device->bc_implemented == BC_IMPLEMENTED) {  in set_broadcast_channel()
970 				device->node_id, generation, device->max_speed,  in set_broadcast_channel()
976 int fw_device_set_broadcast_channel(struct device *dev, void *gen)  in fw_device_set_broadcast_channel()
986 	struct fw_device *device =  in fw_device_init()  local
988 	struct fw_card *card = device->card;  in fw_device_init()
989 	struct device *revived_dev;  in fw_device_init()
995 	 * device.  in fw_device_init()
998 	ret = read_config_rom(device, device->generation);  in fw_device_init()
1000 		if (device->config_rom_retries < MAX_RETRIES &&  in fw_device_init()
1001 		    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {  in fw_device_init()
1002 			device->config_rom_retries++;  in fw_device_init()
1003 			fw_schedule_device_work(device, RETRY_DELAY);  in fw_device_init()
1005 			if (device->node->link_on)  in fw_device_init()
1007 					  device->node_id,  in fw_device_init()
1009 			if (device->node == card->root_node)  in fw_device_init()
1011 			fw_device_release(&device->device);  in fw_device_init()
1016 	revived_dev = device_find_child(card->device,  in fw_device_init()
1017 					device, lookup_existing_device);  in fw_device_init()
1020 		fw_device_release(&device->device);  in fw_device_init()
1025 	device_initialize(&device->device);  in fw_device_init()
1027 	fw_device_get(device);  in fw_device_init()
1029 	minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,  in fw_device_init()
1036 	device->device.bus = &fw_bus_type;  in fw_device_init()
1037 	device->device.type = &fw_device_type;  in fw_device_init()
1038 	device->device.parent = card->device;  in fw_device_init()
1039 	device->device.devt = MKDEV(fw_cdev_major, minor);  in fw_device_init()
1040 	dev_set_name(&device->device, "fw%d", minor);  in fw_device_init()
1042 	BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <  in fw_device_init()
1045 	init_fw_attribute_group(&device->device,  in fw_device_init()
1047 				&device->attribute_group);  in fw_device_init()
1049 	if (device_add(&device->device)) {  in fw_device_init()
1050 		fw_err(card, "failed to add device\n");  in fw_device_init()
1054 	create_units(device);  in fw_device_init()
1057 	 * Transition the device to running state.  If it got pulled  in fw_device_init()
1059 	 * have to shut down the device again here.  Normally, though,  in fw_device_init()
1065 	if (atomic_cmpxchg(&device->state,  in fw_device_init()
1068 		device->workfn = fw_device_shutdown;  in fw_device_init()
1069 		fw_schedule_device_work(device, SHUTDOWN_DELAY);  in fw_device_init()
1071 		fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",  in fw_device_init()
1072 			  dev_name(&device->device),  in fw_device_init()
1073 			  device->config_rom[3], device->config_rom[4],  in fw_device_init()
1074 			  1 << device->max_speed);  in fw_device_init()
1075 		device->config_rom_retries = 0;  in fw_device_init()
1077 		set_broadcast_channel(device, device->generation);  in fw_device_init()
1079 		add_device_randomness(&device->config_rom[3], 8);  in fw_device_init()
1088 	if (device->node == card->root_node)  in fw_device_init()
1098 	fw_device_put(device);		/* fw_device_idr's reference */  in fw_device_init()
1100 	put_device(&device->device);	/* our reference */  in fw_device_init()
1104 static int reread_config_rom(struct fw_device *device, int generation,  in reread_config_rom()  argument
1111 		rcode = read_rom(device, generation, i, &q);  in reread_config_rom()
1119 		if (q != device->config_rom[i]) {  in reread_config_rom()
1131 	struct fw_device *device =  in fw_device_refresh()  local
1133 	struct fw_card *card = device->card;  in fw_device_refresh()
1134 	int ret, node_id = device->node_id;  in fw_device_refresh()
1137 	ret = reread_config_rom(device, device->generation, &changed);  in fw_device_refresh()
1142 		if (atomic_cmpxchg(&device->state,  in fw_device_refresh()
1148 		device->config_rom_retries = 0;  in fw_device_refresh()
1156 	device_for_each_child(&device->device, NULL, shutdown_unit);  in fw_device_refresh()
1158 	ret = read_config_rom(device, device->generation);  in fw_device_refresh()
1162 	fw_device_cdev_update(device);  in fw_device_refresh()
1163 	create_units(device);  in fw_device_refresh()
1166 	kobject_uevent(&device->device.kobj, KOBJ_CHANGE);  in fw_device_refresh()
1168 	if (atomic_cmpxchg(&device->state,  in fw_device_refresh()
1173 	fw_notice(card, "refreshed device %s\n", dev_name(&device->device));  in fw_device_refresh()
1174 	device->config_rom_retries = 0;  in fw_device_refresh()
1178 	if (device->config_rom_retries < MAX_RETRIES &&  in fw_device_refresh()
1179 	    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {  in fw_device_refresh()
1180 		device->config_rom_retries++;  in fw_device_refresh()
1181 		fw_schedule_device_work(device, RETRY_DELAY);  in fw_device_refresh()
1185 	fw_notice(card, "giving up on refresh of device %s: %s\n",  in fw_device_refresh()
1186 		  dev_name(&device->device), fw_rcode_string(ret));  in fw_device_refresh()
1188 	atomic_set(&device->state, FW_DEVICE_GONE);  in fw_device_refresh()
1189 	device->workfn = fw_device_shutdown;  in fw_device_refresh()
1190 	fw_schedule_device_work(device, SHUTDOWN_DELAY);  in fw_device_refresh()
1198 	struct fw_device *device = container_of(to_delayed_work(work),  in fw_device_workfn()  local
1200 	device->workfn(work);  in fw_device_workfn()
1205 	struct fw_device *device;  in fw_node_event()  local
1216 		device = kzalloc(sizeof(*device), GFP_ATOMIC);  in fw_node_event()
1217 		if (device == NULL)  in fw_node_event()
1221 		 * Do minimal initialization of the device here, the  in fw_node_event()
1226 		 * You can basically just check device->state and  in fw_node_event()
1230 		atomic_set(&device->state, FW_DEVICE_INITIALIZING);  in fw_node_event()
1231 		device->card = fw_card_get(card);  in fw_node_event()
1232 		device->node = fw_node_get(node);  in fw_node_event()
1233 		device->node_id = node->node_id;  in fw_node_event()
1234 		device->generation = card->generation;  in fw_node_event()
1235 		device->is_local = node == card->local_node;  in fw_node_event()
1236 		mutex_init(&device->client_list_mutex);  in fw_node_event()
1237 		INIT_LIST_HEAD(&device->client_list);  in fw_node_event()
1240 		 * Set the node data to point back to this device so  in fw_node_event()
1242 		 * and generation for the device.  in fw_node_event()
1244 		node->data = device;  in fw_node_event()
1252 		device->workfn = fw_device_init;  in fw_node_event()
1253 		INIT_DELAYED_WORK(&device->work, fw_device_workfn);  in fw_node_event()
1254 		fw_schedule_device_work(device, INITIAL_DELAY);  in fw_node_event()
1259 		device = node->data;  in fw_node_event()
1260 		if (device == NULL)  in fw_node_event()
1263 		device->node_id = node->node_id;  in fw_node_event()
1265 		device->generation = card->generation;  in fw_node_event()
1266 		if (atomic_cmpxchg(&device->state,  in fw_node_event()
1269 			device->workfn = fw_device_refresh;  in fw_node_event()
1270 			fw_schedule_device_work(device,  in fw_node_event()
1271 				device->is_local ? 0 : INITIAL_DELAY);  in fw_node_event()
1276 		device = node->data;  in fw_node_event()
1277 		if (device == NULL)  in fw_node_event()
1280 		device->node_id = node->node_id;  in fw_node_event()
1282 		device->generation = card->generation;  in fw_node_event()
1283 		if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {  in fw_node_event()
1284 			device->workfn = fw_device_update;  in fw_node_event()
1285 			fw_schedule_device_work(device, 0);  in fw_node_event()
1295 		 * Destroy the device associated with the node.  There  in fw_node_event()
1296 		 * are two cases here: either the device is fully  in fw_node_event()
1300 		 * initialized we can reuse device->work to schedule a  in fw_node_event()
1303 		 * the device in shutdown state to have that code fail  in fw_node_event()
1304 		 * to create the device.  in fw_node_event()
1306 		device = node->data;  in fw_node_event()
1307 		if (atomic_xchg(&device->state,  in fw_node_event()
1309 			device->workfn = fw_device_shutdown;  in fw_node_event()
1310 			fw_schedule_device_work(device,  in fw_node_event()