2 * Device probing and sysfs code.
4 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include <linux/ctype.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/firewire.h>
26 #include <linux/firewire-constants.h>
27 #include <linux/idr.h>
28 #include <linux/jiffies.h>
29 #include <linux/kobject.h>
30 #include <linux/list.h>
31 #include <linux/mod_devicetable.h>
32 #include <linux/module.h>
33 #include <linux/mutex.h>
34 #include <linux/rwsem.h>
35 #include <linux/semaphore.h>
36 #include <linux/spinlock.h>
37 #include <linux/string.h>
38 #include <linux/workqueue.h>
40 #include <asm/atomic.h>
41 #include <asm/byteorder.h>
42 #include <asm/system.h>
46 void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
49 ci->end = ci->p + (p[0] >> 16);
51 EXPORT_SYMBOL(fw_csr_iterator_init);
53 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
56 *value = *ci->p & 0xffffff;
58 return ci->p++ < ci->end;
60 EXPORT_SYMBOL(fw_csr_iterator_next);
62 static bool is_fw_unit(struct device *dev);
64 static int match_unit_directory(u32 *directory, u32 match_flags,
65 const struct ieee1394_device_id *id)
67 struct fw_csr_iterator ci;
68 int key, value, match;
71 fw_csr_iterator_init(&ci, directory);
72 while (fw_csr_iterator_next(&ci, &key, &value)) {
73 if (key == CSR_VENDOR && value == id->vendor_id)
74 match |= IEEE1394_MATCH_VENDOR_ID;
75 if (key == CSR_MODEL && value == id->model_id)
76 match |= IEEE1394_MATCH_MODEL_ID;
77 if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
78 match |= IEEE1394_MATCH_SPECIFIER_ID;
79 if (key == CSR_VERSION && value == id->version)
80 match |= IEEE1394_MATCH_VERSION;
83 return (match & match_flags) == match_flags;
86 static int fw_unit_match(struct device *dev, struct device_driver *drv)
88 struct fw_unit *unit = fw_unit(dev);
89 struct fw_device *device;
90 const struct ieee1394_device_id *id;
92 /* We only allow binding to fw_units. */
96 device = fw_parent_device(unit);
97 id = container_of(drv, struct fw_driver, driver)->id_table;
99 for (; id->match_flags != 0; id++) {
100 if (match_unit_directory(unit->directory, id->match_flags, id))
103 /* Also check vendor ID in the root directory. */
104 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
105 match_unit_directory(&device->config_rom[5],
106 IEEE1394_MATCH_VENDOR_ID, id) &&
107 match_unit_directory(unit->directory, id->match_flags
108 & ~IEEE1394_MATCH_VENDOR_ID, id))
115 static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
117 struct fw_device *device = fw_parent_device(unit);
118 struct fw_csr_iterator ci;
123 int specifier_id = 0;
126 fw_csr_iterator_init(&ci, &device->config_rom[5]);
127 while (fw_csr_iterator_next(&ci, &key, &value)) {
138 fw_csr_iterator_init(&ci, unit->directory);
139 while (fw_csr_iterator_next(&ci, &key, &value)) {
141 case CSR_SPECIFIER_ID:
142 specifier_id = value;
150 return snprintf(buffer, buffer_size,
151 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
152 vendor, model, specifier_id, version);
155 static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
157 struct fw_unit *unit = fw_unit(dev);
160 get_modalias(unit, modalias, sizeof(modalias));
162 if (add_uevent_var(env, "MODALIAS=%s", modalias))
168 struct bus_type fw_bus_type = {
170 .match = fw_unit_match,
172 EXPORT_SYMBOL(fw_bus_type);
174 int fw_device_enable_phys_dma(struct fw_device *device)
176 int generation = device->generation;
178 /* device->node_id, accessed below, must not be older than generation */
181 return device->card->driver->enable_phys_dma(device->card,
185 EXPORT_SYMBOL(fw_device_enable_phys_dma);
187 struct config_rom_attribute {
188 struct device_attribute attr;
192 static ssize_t show_immediate(struct device *dev,
193 struct device_attribute *dattr, char *buf)
195 struct config_rom_attribute *attr =
196 container_of(dattr, struct config_rom_attribute, attr);
197 struct fw_csr_iterator ci;
199 int key, value, ret = -ENOENT;
201 down_read(&fw_device_rwsem);
204 dir = fw_unit(dev)->directory;
206 dir = fw_device(dev)->config_rom + 5;
208 fw_csr_iterator_init(&ci, dir);
209 while (fw_csr_iterator_next(&ci, &key, &value))
210 if (attr->key == key) {
211 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
216 up_read(&fw_device_rwsem);
221 #define IMMEDIATE_ATTR(name, key) \
222 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
224 static ssize_t show_text_leaf(struct device *dev,
225 struct device_attribute *dattr, char *buf)
227 struct config_rom_attribute *attr =
228 container_of(dattr, struct config_rom_attribute, attr);
229 struct fw_csr_iterator ci;
230 u32 *dir, *block = NULL, *p, *end;
231 int length, key, value, last_key = 0, ret = -ENOENT;
234 down_read(&fw_device_rwsem);
237 dir = fw_unit(dev)->directory;
239 dir = fw_device(dev)->config_rom + 5;
241 fw_csr_iterator_init(&ci, dir);
242 while (fw_csr_iterator_next(&ci, &key, &value)) {
243 if (attr->key == last_key &&
244 key == (CSR_DESCRIPTOR | CSR_LEAF))
245 block = ci.p - 1 + value;
252 length = min(block[0] >> 16, 256U);
256 if (block[1] != 0 || block[2] != 0)
257 /* Unknown encoding. */
266 end = &block[length + 1];
267 for (p = &block[3]; p < end; p++, b += 4)
268 * (u32 *) b = (__force u32) __cpu_to_be32(*p);
270 /* Strip trailing whitespace and add newline. */
271 while (b--, (isspace(*b) || *b == '\0') && b > buf);
275 up_read(&fw_device_rwsem);
280 #define TEXT_LEAF_ATTR(name, key) \
281 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
283 static struct config_rom_attribute config_rom_attributes[] = {
284 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
285 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
286 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
287 IMMEDIATE_ATTR(version, CSR_VERSION),
288 IMMEDIATE_ATTR(model, CSR_MODEL),
289 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
290 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
291 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
294 static void init_fw_attribute_group(struct device *dev,
295 struct device_attribute *attrs,
296 struct fw_attribute_group *group)
298 struct device_attribute *attr;
301 for (j = 0; attrs[j].attr.name != NULL; j++)
302 group->attrs[j] = &attrs[j].attr;
304 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
305 attr = &config_rom_attributes[i].attr;
306 if (attr->show(dev, attr, NULL) < 0)
308 group->attrs[j++] = &attr->attr;
311 group->attrs[j] = NULL;
312 group->groups[0] = &group->group;
313 group->groups[1] = NULL;
314 group->group.attrs = group->attrs;
315 dev->groups = group->groups;
318 static ssize_t modalias_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
321 struct fw_unit *unit = fw_unit(dev);
324 length = get_modalias(unit, buf, PAGE_SIZE);
325 strcpy(buf + length, "\n");
330 static ssize_t rom_index_show(struct device *dev,
331 struct device_attribute *attr, char *buf)
333 struct fw_device *device = fw_device(dev->parent);
334 struct fw_unit *unit = fw_unit(dev);
336 return snprintf(buf, PAGE_SIZE, "%d\n",
337 (int)(unit->directory - device->config_rom));
340 static struct device_attribute fw_unit_attributes[] = {
342 __ATTR_RO(rom_index),
346 static ssize_t config_rom_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
349 struct fw_device *device = fw_device(dev);
352 down_read(&fw_device_rwsem);
353 length = device->config_rom_length * 4;
354 memcpy(buf, device->config_rom, length);
355 up_read(&fw_device_rwsem);
360 static ssize_t guid_show(struct device *dev,
361 struct device_attribute *attr, char *buf)
363 struct fw_device *device = fw_device(dev);
366 down_read(&fw_device_rwsem);
367 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
368 device->config_rom[3], device->config_rom[4]);
369 up_read(&fw_device_rwsem);
374 static int units_sprintf(char *buf, u32 *directory)
376 struct fw_csr_iterator ci;
378 int specifier_id = 0;
381 fw_csr_iterator_init(&ci, directory);
382 while (fw_csr_iterator_next(&ci, &key, &value)) {
384 case CSR_SPECIFIER_ID:
385 specifier_id = value;
393 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
396 static ssize_t units_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
399 struct fw_device *device = fw_device(dev);
400 struct fw_csr_iterator ci;
401 int key, value, i = 0;
403 down_read(&fw_device_rwsem);
404 fw_csr_iterator_init(&ci, &device->config_rom[5]);
405 while (fw_csr_iterator_next(&ci, &key, &value)) {
406 if (key != (CSR_UNIT | CSR_DIRECTORY))
408 i += units_sprintf(&buf[i], ci.p + value - 1);
409 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
412 up_read(&fw_device_rwsem);
420 static struct device_attribute fw_device_attributes[] = {
421 __ATTR_RO(config_rom),
427 static int read_rom(struct fw_device *device,
428 int generation, int index, u32 *data)
432 /* device->node_id, accessed below, must not be older than generation */
435 rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST,
436 device->node_id, generation, device->max_speed,
437 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4,
444 #define READ_BIB_ROM_SIZE 256
445 #define READ_BIB_STACK_SIZE 16
448 * Read the bus info block, perform a speed probe, and read all of the rest of
449 * the config ROM. We do all this with a cached bus generation. If the bus
450 * generation changes under us, read_bus_info_block will fail and get retried.
451 * It's better to start all over in this case because the node from which we
452 * are reading the ROM may have changed the ROM during the reset.
454 static int read_bus_info_block(struct fw_device *device, int generation)
456 u32 *rom, *stack, *old_rom, *new_rom;
458 int i, end, length, ret = -1;
460 rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
461 sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
465 stack = &rom[READ_BIB_ROM_SIZE];
467 device->max_speed = SCODE_100;
469 /* First read the bus info block. */
470 for (i = 0; i < 5; i++) {
471 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
474 * As per IEEE1212 7.2, during power-up, devices can
475 * reply with a 0 for the first quadlet of the config
476 * rom to indicate that they are booting (for example,
477 * if the firmware is on the disk of a external
478 * harddisk). In that case we just fail, and the
479 * retry mechanism will try again later.
481 if (i == 0 && rom[i] == 0)
485 device->max_speed = device->node->max_speed;
488 * Determine the speed of
489 * - devices with link speed less than PHY speed,
490 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
491 * - all devices if there are 1394b repeaters.
492 * Note, we cannot use the bus info block's link_spd as starting point
493 * because some buggy firmwares set it lower than necessary and because
494 * 1394-1995 nodes do not have the field.
496 if ((rom[2] & 0x7) < device->max_speed ||
497 device->max_speed == SCODE_BETA ||
498 device->card->beta_repeaters_present) {
501 /* for S1600 and S3200 */
502 if (device->max_speed == SCODE_BETA)
503 device->max_speed = device->card->link_speed;
505 while (device->max_speed > SCODE_100) {
506 if (read_rom(device, generation, 0, &dummy) ==
514 * Now parse the config rom. The config rom is a recursive
515 * directory structure so we parse it using a stack of
516 * references to the blocks that make up the structure. We
517 * push a reference to the root directory on the stack to
522 stack[sp++] = 0xc0000005;
525 * Pop the next block reference of the stack. The
526 * lower 24 bits is the offset into the config rom,
527 * the upper 8 bits are the type of the reference the
532 if (i >= READ_BIB_ROM_SIZE)
534 * The reference points outside the standard
535 * config rom area, something's fishy.
539 /* Read header quadlet for the block to get the length. */
540 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
542 end = i + (rom[i] >> 16) + 1;
544 if (end > READ_BIB_ROM_SIZE)
546 * This block extends outside standard config
547 * area (and the array we're reading it
548 * into). That's broken, so ignore this
554 * Now read in the block. If this is a directory
555 * block, check the entries as we read them to see if
556 * it references another block, and push it in that case.
559 if (read_rom(device, generation, i, &rom[i]) !=
562 if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
563 sp < READ_BIB_STACK_SIZE)
564 stack[sp++] = i + rom[i];
571 old_rom = device->config_rom;
572 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
576 down_write(&fw_device_rwsem);
577 device->config_rom = new_rom;
578 device->config_rom_length = length;
579 up_write(&fw_device_rwsem);
583 device->cmc = rom[2] >> 30 & 1;
590 static void fw_unit_release(struct device *dev)
592 struct fw_unit *unit = fw_unit(dev);
597 static struct device_type fw_unit_type = {
598 .uevent = fw_unit_uevent,
599 .release = fw_unit_release,
602 static bool is_fw_unit(struct device *dev)
604 return dev->type == &fw_unit_type;
607 static void create_units(struct fw_device *device)
609 struct fw_csr_iterator ci;
610 struct fw_unit *unit;
614 fw_csr_iterator_init(&ci, &device->config_rom[5]);
615 while (fw_csr_iterator_next(&ci, &key, &value)) {
616 if (key != (CSR_UNIT | CSR_DIRECTORY))
620 * Get the address of the unit directory and try to
621 * match the drivers id_tables against it.
623 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
625 fw_error("failed to allocate memory for unit\n");
629 unit->directory = ci.p + value - 1;
630 unit->device.bus = &fw_bus_type;
631 unit->device.type = &fw_unit_type;
632 unit->device.parent = &device->device;
633 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
635 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
636 ARRAY_SIZE(fw_unit_attributes) +
637 ARRAY_SIZE(config_rom_attributes));
638 init_fw_attribute_group(&unit->device,
640 &unit->attribute_group);
642 if (device_register(&unit->device) < 0)
652 static int shutdown_unit(struct device *device, void *data)
654 device_unregister(device);
660 * fw_device_rwsem acts as dual purpose mutex:
661 * - serializes accesses to fw_device_idr,
662 * - serializes accesses to fw_device.config_rom/.config_rom_length and
663 * fw_unit.directory, unless those accesses happen at safe occasions
665 DECLARE_RWSEM(fw_device_rwsem);
667 DEFINE_IDR(fw_device_idr);
670 struct fw_device *fw_device_get_by_devt(dev_t devt)
672 struct fw_device *device;
674 down_read(&fw_device_rwsem);
675 device = idr_find(&fw_device_idr, MINOR(devt));
677 fw_device_get(device);
678 up_read(&fw_device_rwsem);
684 * These defines control the retry behavior for reading the config
685 * rom. It shouldn't be necessary to tweak these; if the device
686 * doesn't respond to a config rom read within 10 seconds, it's not
687 * going to respond at all. As for the initial delay, a lot of
688 * devices will be able to respond within half a second after bus
689 * reset. On the other hand, it's not really worth being more
690 * aggressive than that, since it scales pretty well; if 10 devices
691 * are plugged in, they're all getting read within one second.
694 #define MAX_RETRIES 10
695 #define RETRY_DELAY (3 * HZ)
696 #define INITIAL_DELAY (HZ / 2)
697 #define SHUTDOWN_DELAY (2 * HZ)
699 static void fw_device_shutdown(struct work_struct *work)
701 struct fw_device *device =
702 container_of(work, struct fw_device, work.work);
703 int minor = MINOR(device->device.devt);
705 if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY)
706 && !list_empty(&device->card->link)) {
707 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
711 if (atomic_cmpxchg(&device->state,
713 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
716 fw_device_cdev_remove(device);
717 device_for_each_child(&device->device, NULL, shutdown_unit);
718 device_unregister(&device->device);
720 down_write(&fw_device_rwsem);
721 idr_remove(&fw_device_idr, minor);
722 up_write(&fw_device_rwsem);
724 fw_device_put(device);
727 static void fw_device_release(struct device *dev)
729 struct fw_device *device = fw_device(dev);
730 struct fw_card *card = device->card;
734 * Take the card lock so we don't set this to NULL while a
735 * FW_NODE_UPDATED callback is being handled or while the
736 * bus manager work looks at this node.
738 spin_lock_irqsave(&card->lock, flags);
739 device->node->data = NULL;
740 spin_unlock_irqrestore(&card->lock, flags);
742 fw_node_put(device->node);
743 kfree(device->config_rom);
748 static struct device_type fw_device_type = {
749 .release = fw_device_release,
752 static bool is_fw_device(struct device *dev)
754 return dev->type == &fw_device_type;
757 static int update_unit(struct device *dev, void *data)
759 struct fw_unit *unit = fw_unit(dev);
760 struct fw_driver *driver = (struct fw_driver *)dev->driver;
762 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
764 driver->update(unit);
771 static void fw_device_update(struct work_struct *work)
773 struct fw_device *device =
774 container_of(work, struct fw_device, work.work);
776 fw_device_cdev_update(device);
777 device_for_each_child(&device->device, NULL, update_unit);
781 * If a device was pending for deletion because its node went away but its
782 * bus info block and root directory header matches that of a newly discovered
783 * device, revive the existing fw_device.
784 * The newly allocated fw_device becomes obsolete instead.
786 static int lookup_existing_device(struct device *dev, void *data)
788 struct fw_device *old = fw_device(dev);
789 struct fw_device *new = data;
790 struct fw_card *card = new->card;
793 if (!is_fw_device(dev))
796 down_read(&fw_device_rwsem); /* serialize config_rom access */
797 spin_lock_irq(&card->lock); /* serialize node access */
799 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
800 atomic_cmpxchg(&old->state,
802 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
803 struct fw_node *current_node = new->node;
804 struct fw_node *obsolete_node = old->node;
806 new->node = obsolete_node;
807 new->node->data = new;
808 old->node = current_node;
809 old->node->data = old;
811 old->max_speed = new->max_speed;
812 old->node_id = current_node->node_id;
813 smp_wmb(); /* update node_id before generation */
814 old->generation = card->generation;
815 old->config_rom_retries = 0;
816 fw_notify("rediscovered device %s\n", dev_name(dev));
818 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
819 schedule_delayed_work(&old->work, 0);
821 if (current_node == card->root_node)
822 fw_schedule_bm_work(card, 0);
827 spin_unlock_irq(&card->lock);
828 up_read(&fw_device_rwsem);
833 enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
835 static void set_broadcast_channel(struct fw_device *device, int generation)
837 struct fw_card *card = device->card;
841 if (!card->broadcast_channel_allocated)
844 if (device->bc_implemented == BC_UNKNOWN) {
845 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
846 device->node_id, generation, device->max_speed,
847 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
851 if (data & cpu_to_be32(1 << 31)) {
852 device->bc_implemented = BC_IMPLEMENTED;
855 /* else fall through to case address error */
856 case RCODE_ADDRESS_ERROR:
857 device->bc_implemented = BC_UNIMPLEMENTED;
861 if (device->bc_implemented == BC_IMPLEMENTED) {
862 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
863 BROADCAST_CHANNEL_VALID);
864 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
865 device->node_id, generation, device->max_speed,
866 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
871 int fw_device_set_broadcast_channel(struct device *dev, void *gen)
873 if (is_fw_device(dev))
874 set_broadcast_channel(fw_device(dev), (long)gen);
879 static void fw_device_init(struct work_struct *work)
881 struct fw_device *device =
882 container_of(work, struct fw_device, work.work);
883 struct device *revived_dev;
887 * All failure paths here set node->data to NULL, so that we
888 * don't try to do device_for_each_child() on a kfree()'d
892 if (read_bus_info_block(device, device->generation) < 0) {
893 if (device->config_rom_retries < MAX_RETRIES &&
894 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
895 device->config_rom_retries++;
896 schedule_delayed_work(&device->work, RETRY_DELAY);
898 fw_notify("giving up on config rom for node id %x\n",
900 if (device->node == device->card->root_node)
901 fw_schedule_bm_work(device->card, 0);
902 fw_device_release(&device->device);
907 revived_dev = device_find_child(device->card->device,
908 device, lookup_existing_device);
910 put_device(revived_dev);
911 fw_device_release(&device->device);
916 device_initialize(&device->device);
918 fw_device_get(device);
919 down_write(&fw_device_rwsem);
920 ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
921 idr_get_new(&fw_device_idr, device, &minor) :
923 up_write(&fw_device_rwsem);
928 device->device.bus = &fw_bus_type;
929 device->device.type = &fw_device_type;
930 device->device.parent = device->card->device;
931 device->device.devt = MKDEV(fw_cdev_major, minor);
932 dev_set_name(&device->device, "fw%d", minor);
934 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
935 ARRAY_SIZE(fw_device_attributes) +
936 ARRAY_SIZE(config_rom_attributes));
937 init_fw_attribute_group(&device->device,
938 fw_device_attributes,
939 &device->attribute_group);
941 if (device_add(&device->device)) {
942 fw_error("Failed to add device.\n");
943 goto error_with_cdev;
946 create_units(device);
949 * Transition the device to running state. If it got pulled
950 * out from under us while we did the intialization work, we
951 * have to shut down the device again here. Normally, though,
952 * fw_node_event will be responsible for shutting it down when
953 * necessary. We have to use the atomic cmpxchg here to avoid
954 * racing with the FW_NODE_DESTROYED case in
957 if (atomic_cmpxchg(&device->state,
958 FW_DEVICE_INITIALIZING,
959 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
960 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
961 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
963 if (device->config_rom_retries)
964 fw_notify("created device %s: GUID %08x%08x, S%d00, "
965 "%d config ROM retries\n",
966 dev_name(&device->device),
967 device->config_rom[3], device->config_rom[4],
968 1 << device->max_speed,
969 device->config_rom_retries);
971 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
972 dev_name(&device->device),
973 device->config_rom[3], device->config_rom[4],
974 1 << device->max_speed);
975 device->config_rom_retries = 0;
977 set_broadcast_channel(device, device->generation);
981 * Reschedule the IRM work if we just finished reading the
982 * root node config rom. If this races with a bus reset we
983 * just end up running the IRM work a couple of extra times -
986 if (device->node == device->card->root_node)
987 fw_schedule_bm_work(device->card, 0);
992 down_write(&fw_device_rwsem);
993 idr_remove(&fw_device_idr, minor);
994 up_write(&fw_device_rwsem);
996 fw_device_put(device); /* fw_device_idr's reference */
998 put_device(&device->device); /* our reference */
1004 REREAD_BIB_UNCHANGED,
1008 /* Reread and compare bus info block and header of root directory */
1009 static int reread_bus_info_block(struct fw_device *device, int generation)
1014 for (i = 0; i < 6; i++) {
1015 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
1016 return REREAD_BIB_ERROR;
1018 if (i == 0 && q == 0)
1019 return REREAD_BIB_GONE;
1021 if (q != device->config_rom[i])
1022 return REREAD_BIB_CHANGED;
1025 return REREAD_BIB_UNCHANGED;
1028 static void fw_device_refresh(struct work_struct *work)
1030 struct fw_device *device =
1031 container_of(work, struct fw_device, work.work);
1032 struct fw_card *card = device->card;
1033 int node_id = device->node_id;
1035 switch (reread_bus_info_block(device, device->generation)) {
1036 case REREAD_BIB_ERROR:
1037 if (device->config_rom_retries < MAX_RETRIES / 2 &&
1038 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1039 device->config_rom_retries++;
1040 schedule_delayed_work(&device->work, RETRY_DELAY / 2);
1046 case REREAD_BIB_GONE:
1049 case REREAD_BIB_UNCHANGED:
1050 if (atomic_cmpxchg(&device->state,
1051 FW_DEVICE_INITIALIZING,
1052 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1055 fw_device_update(work);
1056 device->config_rom_retries = 0;
1059 case REREAD_BIB_CHANGED:
1064 * Something changed. We keep things simple and don't investigate
1065 * further. We just destroy all previous units and create new ones.
1067 device_for_each_child(&device->device, NULL, shutdown_unit);
1069 if (read_bus_info_block(device, device->generation) < 0) {
1070 if (device->config_rom_retries < MAX_RETRIES &&
1071 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1072 device->config_rom_retries++;
1073 schedule_delayed_work(&device->work, RETRY_DELAY);
1080 create_units(device);
1082 /* Userspace may want to re-read attributes. */
1083 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1085 if (atomic_cmpxchg(&device->state,
1086 FW_DEVICE_INITIALIZING,
1087 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1090 fw_notify("refreshed device %s\n", dev_name(&device->device));
1091 device->config_rom_retries = 0;
1095 fw_notify("giving up on refresh of device %s\n", dev_name(&device->device));
1097 atomic_set(&device->state, FW_DEVICE_GONE);
1098 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1099 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
1101 if (node_id == card->root_node->node_id)
1102 fw_schedule_bm_work(card, 0);
1105 void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1107 struct fw_device *device;
1110 case FW_NODE_CREATED:
1111 case FW_NODE_LINK_ON:
1115 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1120 * Do minimal intialization of the device here, the
1121 * rest will happen in fw_device_init().
1123 * Attention: A lot of things, even fw_device_get(),
1124 * cannot be done before fw_device_init() finished!
1125 * You can basically just check device->state and
1126 * schedule work until then, but only while holding
1129 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
1130 device->card = fw_card_get(card);
1131 device->node = fw_node_get(node);
1132 device->node_id = node->node_id;
1133 device->generation = card->generation;
1134 device->is_local = node == card->local_node;
1135 mutex_init(&device->client_list_mutex);
1136 INIT_LIST_HEAD(&device->client_list);
1139 * Set the node data to point back to this device so
1140 * FW_NODE_UPDATED callbacks can update the node_id
1141 * and generation for the device.
1143 node->data = device;
1146 * Many devices are slow to respond after bus resets,
1147 * especially if they are bus powered and go through
1148 * power-up after getting plugged in. We schedule the
1149 * first config rom scan half a second after bus reset.
1151 INIT_DELAYED_WORK(&device->work, fw_device_init);
1152 schedule_delayed_work(&device->work, INITIAL_DELAY);
1155 case FW_NODE_INITIATED_RESET:
1156 device = node->data;
1160 device->node_id = node->node_id;
1161 smp_wmb(); /* update node_id before generation */
1162 device->generation = card->generation;
1163 if (atomic_cmpxchg(&device->state,
1165 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1166 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
1167 schedule_delayed_work(&device->work,
1168 device->is_local ? 0 : INITIAL_DELAY);
1172 case FW_NODE_UPDATED:
1173 if (!node->link_on || node->data == NULL)
1176 device = node->data;
1177 device->node_id = node->node_id;
1178 smp_wmb(); /* update node_id before generation */
1179 device->generation = card->generation;
1180 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1181 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
1182 schedule_delayed_work(&device->work, 0);
1186 case FW_NODE_DESTROYED:
1187 case FW_NODE_LINK_OFF:
1192 * Destroy the device associated with the node. There
1193 * are two cases here: either the device is fully
1194 * initialized (FW_DEVICE_RUNNING) or we're in the
1195 * process of reading its config rom
1196 * (FW_DEVICE_INITIALIZING). If it is fully
1197 * initialized we can reuse device->work to schedule a
1198 * full fw_device_shutdown(). If not, there's work
1199 * scheduled to read it's config rom, and we just put
1200 * the device in shutdown state to have that code fail
1201 * to create the device.
1203 device = node->data;
1204 if (atomic_xchg(&device->state,
1205 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
1206 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1207 schedule_delayed_work(&device->work,
1208 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);