3  * Device probing and sysfs code.
11 #include <linux/device.h>
192 static const struct ieee1394_device_id *unit_match(struct device *dev,  in unit_match()
208 static bool is_fw_unit(const struct device *dev);
210 static int fw_unit_match(struct device *dev, struct device_driver *drv)  in fw_unit_match()
216 static int fw_unit_probe(struct device *dev)  in fw_unit_probe()
224 static void fw_unit_remove(struct device *dev)  in fw_unit_remove()
243 static int fw_unit_uevent(const struct device *dev, struct kobj_uevent_env *env)  in fw_unit_uevent()
264 int fw_device_enable_phys_dma(struct fw_device *device)  in fw_device_enable_phys_dma()  argument
266 	int generation = device->generation;  in fw_device_enable_phys_dma()
268 	/* device->node_id, accessed below, must not be older than generation */  in fw_device_enable_phys_dma()
271 	return device->card->driver->enable_phys_dma(device->card,  in fw_device_enable_phys_dma()
272 						     device->node_id,  in fw_device_enable_phys_dma()
282 static ssize_t show_immediate(struct device *dev,  in show_immediate()
331 static ssize_t show_text_leaf(struct device *dev,  in show_text_leaf()
410 static void init_fw_attribute_group(struct device *dev,  in init_fw_attribute_group()
434 static ssize_t modalias_show(struct device *dev,  in modalias_show()
446 static ssize_t rom_index_show(struct device *dev,  in rom_index_show()
449 	struct fw_device *device = fw_device(dev->parent);  in rom_index_show()  local
452 	return sysfs_emit(buf, "%td\n", unit->directory - device->config_rom);  in rom_index_show()
461 static ssize_t config_rom_show(struct device *dev,  in config_rom_show()
464 	struct fw_device *device = fw_device(dev);  in config_rom_show()  local
468 	length = device->config_rom_length * 4;  in config_rom_show()
469 	memcpy(buf, device->config_rom, length);  in config_rom_show()
475 static ssize_t guid_show(struct device *dev,  in guid_show()
478 	struct fw_device *device = fw_device(dev);  in guid_show()  local
482 	ret = sysfs_emit(buf, "0x%08x%08x\n", device->config_rom[3], device->config_rom[4]);  in guid_show()
488 static ssize_t is_local_show(struct device *dev,  in is_local_show()
491 	struct fw_device *device = fw_device(dev);  in is_local_show()  local
493 	return sprintf(buf, "%u\n", device->is_local);  in is_local_show()
518 static ssize_t units_show(struct device *dev,  in units_show()
521 	struct fw_device *device = fw_device(dev);  in units_show()  local
526 	fw_csr_iterator_init(&ci, &device->config_rom[ROOT_DIR_OFFSET]);  in units_show()
550 static int read_rom(struct fw_device *device,  in read_rom()  argument
556 	/* device->node_id, accessed below, must not be older than generation */  in read_rom()
560 		rcode = fw_run_transaction(device->card,  in read_rom()
561 				TCODE_READ_QUADLET_REQUEST, device->node_id,  in read_rom()
562 				generation, device->max_speed, offset, data, 4);  in read_rom()
582 static int read_config_rom(struct fw_device *device, int generation)  in read_config_rom()  argument
584 	struct fw_card *card = device->card;  in read_config_rom()
598 	device->max_speed = SCODE_100;  in read_config_rom()
602 		ret = read_rom(device, generation, i, &rom[i]);  in read_config_rom()
619 	device->max_speed = device->node->max_speed;  in read_config_rom()
630 	if ((rom[2] & 0x7) < device->max_speed ||  in read_config_rom()
631 	    device->max_speed == SCODE_BETA ||  in read_config_rom()
636 		if (device->max_speed == SCODE_BETA)  in read_config_rom()
637 			device->max_speed = card->link_speed;  in read_config_rom()
639 		while (device->max_speed > SCODE_100) {  in read_config_rom()
640 			if (read_rom(device, generation, 0, &dummy) ==  in read_config_rom()
643 			device->max_speed--;  in read_config_rom()
672 		ret = read_rom(device, generation, i, &rom[i]);  in read_config_rom()
696 			ret = read_rom(device, generation, i, &rom[i]);  in read_config_rom()
723 	old_rom = device->config_rom;  in read_config_rom()
731 	device->config_rom = new_rom;  in read_config_rom()
732 	device->config_rom_length = length;  in read_config_rom()
737 	device->max_rec	= rom[2] >> 12 & 0xf;  in read_config_rom()
738 	device->cmc	= rom[2] >> 30 & 1;  in read_config_rom()
739 	device->irmc	= rom[2] >> 31 & 1;  in read_config_rom()
746 static void fw_unit_release(struct device *dev)  in fw_unit_release()
759 static bool is_fw_unit(const struct device *dev)  in is_fw_unit()
764 static void create_units(struct fw_device *device)  in create_units()  argument
771 	fw_csr_iterator_init(&ci, &device->config_rom[ROOT_DIR_OFFSET]);  in create_units()
785 		unit->device.bus = &fw_bus_type;  in create_units()
786 		unit->device.type = &fw_unit_type;  in create_units()
787 		unit->device.parent = &device->device;  in create_units()
788 		dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);  in create_units()
793 		init_fw_attribute_group(&unit->device,  in create_units()
797 		fw_device_get(device);  in create_units()
798 		if (device_register(&unit->device) < 0) {  in create_units()
799 			put_device(&unit->device);  in create_units()
805 static int shutdown_unit(struct device *device, void *data)  in shutdown_unit()  argument
807 	device_unregister(device);  in shutdown_unit()
825 	struct fw_device *device;  in fw_device_get_by_devt()  local
828 	device = idr_find(&fw_device_idr, MINOR(devt));  in fw_device_get_by_devt()
829 	if (device)  in fw_device_get_by_devt()
830 		fw_device_get(device);  in fw_device_get_by_devt()
833 	return device;  in fw_device_get_by_devt()
839 static void fw_schedule_device_work(struct fw_device *device,  in fw_schedule_device_work()  argument
842 	queue_delayed_work(fw_workqueue, &device->work, delay);  in fw_schedule_device_work()
847  * rom.  It shouldn't be necessary to tweak these; if the device
863 	struct fw_device *device =  in fw_device_shutdown()  local
865 	int minor = MINOR(device->device.devt);  in fw_device_shutdown()
868 			  device->card->reset_jiffies + SHUTDOWN_DELAY)  in fw_device_shutdown()
869 	    && !list_empty(&device->card->link)) {  in fw_device_shutdown()
870 		fw_schedule_device_work(device, SHUTDOWN_DELAY);  in fw_device_shutdown()
874 	if (atomic_cmpxchg(&device->state,  in fw_device_shutdown()
879 	fw_device_cdev_remove(device);  in fw_device_shutdown()
880 	device_for_each_child(&device->device, NULL, shutdown_unit);  in fw_device_shutdown()
881 	device_unregister(&device->device);  in fw_device_shutdown()
887 	fw_device_put(device);  in fw_device_shutdown()
890 static void fw_device_release(struct device *dev)  in fw_device_release()
892 	struct fw_device *device = fw_device(dev);  in fw_device_release()  local
893 	struct fw_card *card = device->card;  in fw_device_release()
902 	device->node->data = NULL;  in fw_device_release()
905 	fw_node_put(device->node);  in fw_device_release()
906 	kfree(device->config_rom);  in fw_device_release()
907 	kfree(device);  in fw_device_release()
915 static bool is_fw_device(const struct device *dev)  in is_fw_device()
920 static int update_unit(struct device *dev, void *data)  in update_unit()
936 	struct fw_device *device =  in fw_device_update()  local
939 	fw_device_cdev_update(device);  in fw_device_update()
940 	device_for_each_child(&device->device, NULL, update_unit);  in fw_device_update()
944  * If a device was pending for deletion because its node went away but its
946  * device, revive the existing fw_device.
949 static int lookup_existing_device(struct device *dev, void *data)  in lookup_existing_device()
979 		fw_notice(card, "rediscovered device %s\n", dev_name(dev));  in lookup_existing_device()
998 static void set_broadcast_channel(struct fw_device *device, int generation)  in set_broadcast_channel()  argument
1000 	struct fw_card *card = device->card;  in set_broadcast_channel()
1014 	if (!device->irmc || device->max_rec < 8)  in set_broadcast_channel()
1021 	if (device->bc_implemented == BC_UNKNOWN) {  in set_broadcast_channel()
1023 				device->node_id, generation, device->max_speed,  in set_broadcast_channel()
1029 				device->bc_implemented = BC_IMPLEMENTED;  in set_broadcast_channel()
1034 			device->bc_implemented = BC_UNIMPLEMENTED;  in set_broadcast_channel()
1038 	if (device->bc_implemented == BC_IMPLEMENTED) {  in set_broadcast_channel()
1042 				device->node_id, generation, device->max_speed,  in set_broadcast_channel()
1048 int fw_device_set_broadcast_channel(struct device *dev, void *gen)  in fw_device_set_broadcast_channel()
1058 	struct fw_device *device =  in fw_device_init()  local
1060 	struct fw_card *card = device->card;  in fw_device_init()
1061 	struct device *revived_dev;  in fw_device_init()
1067 	 * device.  in fw_device_init()
1070 	ret = read_config_rom(device, device->generation);  in fw_device_init()
1072 		if (device->config_rom_retries < MAX_RETRIES &&  in fw_device_init()
1073 		    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {  in fw_device_init()
1074 			device->config_rom_retries++;  in fw_device_init()
1075 			fw_schedule_device_work(device, RETRY_DELAY);  in fw_device_init()
1077 			if (device->node->link_on)  in fw_device_init()
1079 					  device->node_id,  in fw_device_init()
1081 			if (device->node == card->root_node)  in fw_device_init()
1083 			fw_device_release(&device->device);  in fw_device_init()
1088 	revived_dev = device_find_child(card->device,  in fw_device_init()
1089 					device, lookup_existing_device);  in fw_device_init()
1092 		fw_device_release(&device->device);  in fw_device_init()
1097 	device_initialize(&device->device);  in fw_device_init()
1099 	fw_device_get(device);  in fw_device_init()
1101 	minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,  in fw_device_init()
1108 	device->device.bus = &fw_bus_type;  in fw_device_init()
1109 	device->device.type = &fw_device_type;  in fw_device_init()
1110 	device->device.parent = card->device;  in fw_device_init()
1111 	device->device.devt = MKDEV(fw_cdev_major, minor);  in fw_device_init()
1112 	dev_set_name(&device->device, "fw%d", minor);  in fw_device_init()
1114 	BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <  in fw_device_init()
1117 	init_fw_attribute_group(&device->device,  in fw_device_init()
1119 				&device->attribute_group);  in fw_device_init()
1121 	if (device_add(&device->device)) {  in fw_device_init()
1122 		fw_err(card, "failed to add device\n");  in fw_device_init()
1126 	create_units(device);  in fw_device_init()
1129 	 * Transition the device to running state.  If it got pulled  in fw_device_init()
1131 	 * have to shut down the device again here.  Normally, though,  in fw_device_init()
1137 	if (atomic_cmpxchg(&device->state,  in fw_device_init()
1140 		device->workfn = fw_device_shutdown;  in fw_device_init()
1141 		fw_schedule_device_work(device, SHUTDOWN_DELAY);  in fw_device_init()
1143 		fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",  in fw_device_init()
1144 			  dev_name(&device->device),  in fw_device_init()
1145 			  device->config_rom[3], device->config_rom[4],  in fw_device_init()
1146 			  1 << device->max_speed);  in fw_device_init()
1147 		device->config_rom_retries = 0;  in fw_device_init()
1149 		set_broadcast_channel(device, device->generation);  in fw_device_init()
1151 		add_device_randomness(&device->config_rom[3], 8);  in fw_device_init()
1160 	if (device->node == card->root_node)  in fw_device_init()
1170 	fw_device_put(device);		/* fw_device_idr's reference */  in fw_device_init()
1172 	put_device(&device->device);	/* our reference */  in fw_device_init()
1176 static int reread_config_rom(struct fw_device *device, int generation,  in reread_config_rom()  argument
1183 		rcode = read_rom(device, generation, i, &q);  in reread_config_rom()
1191 		if (q != device->config_rom[i]) {  in reread_config_rom()
1203 	struct fw_device *device =  in fw_device_refresh()  local
1205 	struct fw_card *card = device->card;  in fw_device_refresh()
1206 	int ret, node_id = device->node_id;  in fw_device_refresh()
1209 	ret = reread_config_rom(device, device->generation, &changed);  in fw_device_refresh()
1214 		if (atomic_cmpxchg(&device->state,  in fw_device_refresh()
1220 		device->config_rom_retries = 0;  in fw_device_refresh()
1228 	device_for_each_child(&device->device, NULL, shutdown_unit);  in fw_device_refresh()
1230 	ret = read_config_rom(device, device->generation);  in fw_device_refresh()
1234 	fw_device_cdev_update(device);  in fw_device_refresh()
1235 	create_units(device);  in fw_device_refresh()
1238 	kobject_uevent(&device->device.kobj, KOBJ_CHANGE);  in fw_device_refresh()
1240 	if (atomic_cmpxchg(&device->state,  in fw_device_refresh()
1245 	fw_notice(card, "refreshed device %s\n", dev_name(&device->device));  in fw_device_refresh()
1246 	device->config_rom_retries = 0;  in fw_device_refresh()
1250 	if (device->config_rom_retries < MAX_RETRIES &&  in fw_device_refresh()
1251 	    atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {  in fw_device_refresh()
1252 		device->config_rom_retries++;  in fw_device_refresh()
1253 		fw_schedule_device_work(device, RETRY_DELAY);  in fw_device_refresh()
1257 	fw_notice(card, "giving up on refresh of device %s: %s\n",  in fw_device_refresh()
1258 		  dev_name(&device->device), fw_rcode_string(ret));  in fw_device_refresh()
1260 	atomic_set(&device->state, FW_DEVICE_GONE);  in fw_device_refresh()
1261 	device->workfn = fw_device_shutdown;  in fw_device_refresh()
1262 	fw_schedule_device_work(device, SHUTDOWN_DELAY);  in fw_device_refresh()
1270 	struct fw_device *device = container_of(to_delayed_work(work),  in fw_device_workfn()  local
1272 	device->workfn(work);  in fw_device_workfn()
1277 	struct fw_device *device;  in fw_node_event()  local
1288 		device = kzalloc(sizeof(*device), GFP_ATOMIC);  in fw_node_event()
1289 		if (device == NULL)  in fw_node_event()
1293 		 * Do minimal initialization of the device here, the  in fw_node_event()
1298 		 * You can basically just check device->state and  in fw_node_event()
1302 		atomic_set(&device->state, FW_DEVICE_INITIALIZING);  in fw_node_event()
1303 		device->card = fw_card_get(card);  in fw_node_event()
1304 		device->node = fw_node_get(node);  in fw_node_event()
1305 		device->node_id = node->node_id;  in fw_node_event()
1306 		device->generation = card->generation;  in fw_node_event()
1307 		device->is_local = node == card->local_node;  in fw_node_event()
1308 		mutex_init(&device->client_list_mutex);  in fw_node_event()
1309 		INIT_LIST_HEAD(&device->client_list);  in fw_node_event()
1312 		 * Set the node data to point back to this device so  in fw_node_event()
1314 		 * and generation for the device.  in fw_node_event()
1316 		node->data = device;  in fw_node_event()
1324 		device->workfn = fw_device_init;  in fw_node_event()
1325 		INIT_DELAYED_WORK(&device->work, fw_device_workfn);  in fw_node_event()
1326 		fw_schedule_device_work(device, INITIAL_DELAY);  in fw_node_event()
1331 		device = node->data;  in fw_node_event()
1332 		if (device == NULL)  in fw_node_event()
1335 		device->node_id = node->node_id;  in fw_node_event()
1337 		device->generation = card->generation;  in fw_node_event()
1338 		if (atomic_cmpxchg(&device->state,  in fw_node_event()
1341 			device->workfn = fw_device_refresh;  in fw_node_event()
1342 			fw_schedule_device_work(device,  in fw_node_event()
1343 				device->is_local ? 0 : INITIAL_DELAY);  in fw_node_event()
1348 		device = node->data;  in fw_node_event()
1349 		if (device == NULL)  in fw_node_event()
1352 		device->node_id = node->node_id;  in fw_node_event()
1354 		device->generation = card->generation;  in fw_node_event()
1355 		if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {  in fw_node_event()
1356 			device->workfn = fw_device_update;  in fw_node_event()
1357 			fw_schedule_device_work(device, 0);  in fw_node_event()
1367 		 * Destroy the device associated with the node.  There  in fw_node_event()
1368 		 * are two cases here: either the device is fully  in fw_node_event()
1372 		 * initialized we can reuse device->work to schedule a  in fw_node_event()
1375 		 * the device in shutdown state to have that code fail  in fw_node_event()
1376 		 * to create the device.  in fw_node_event()
1378 		device = node->data;  in fw_node_event()
1379 		if (atomic_xchg(&device->state,  in fw_node_event()
1381 			device->workfn = fw_device_shutdown;  in fw_node_event()
1382 			fw_schedule_device_work(device,  in fw_node_event()
1390 #include "device-attribute-test.c"