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/module.h>
22 #include <linux/wait.h>
23 #include <linux/errno.h>
24 #include <linux/kthread.h>
25 #include <linux/device.h>
26 #include <linux/delay.h>
27 #include <linux/idr.h>
28 #include <linux/jiffies.h>
29 #include <linux/string.h>
30 #include <linux/rwsem.h>
31 #include <linux/semaphore.h>
32 #include <linux/spinlock.h>
33 #include <asm/system.h>
34 #include <linux/ctype.h>
35 #include "fw-transaction.h"
36 #include "fw-topology.h"
37 #include "fw-device.h"
39 void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
42 ci->end = ci->p + (p[0] >> 16);
44 EXPORT_SYMBOL(fw_csr_iterator_init);
46 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
49 *value = *ci->p & 0xffffff;
51 return ci->p++ < ci->end;
53 EXPORT_SYMBOL(fw_csr_iterator_next);
55 static int is_fw_unit(struct device *dev);
57 static int match_unit_directory(u32 * directory, const struct fw_device_id *id)
59 struct fw_csr_iterator ci;
60 int key, value, match;
63 fw_csr_iterator_init(&ci, directory);
64 while (fw_csr_iterator_next(&ci, &key, &value)) {
65 if (key == CSR_VENDOR && value == id->vendor)
66 match |= FW_MATCH_VENDOR;
67 if (key == CSR_MODEL && value == id->model)
68 match |= FW_MATCH_MODEL;
69 if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
70 match |= FW_MATCH_SPECIFIER_ID;
71 if (key == CSR_VERSION && value == id->version)
72 match |= FW_MATCH_VERSION;
75 return (match & id->match_flags) == id->match_flags;
78 static int fw_unit_match(struct device *dev, struct device_driver *drv)
80 struct fw_unit *unit = fw_unit(dev);
81 struct fw_driver *driver = fw_driver(drv);
84 /* We only allow binding to fw_units. */
88 for (i = 0; driver->id_table[i].match_flags != 0; i++) {
89 if (match_unit_directory(unit->directory, &driver->id_table[i]))
96 static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
98 struct fw_device *device = fw_device(unit->device.parent);
99 struct fw_csr_iterator ci;
104 int specifier_id = 0;
107 fw_csr_iterator_init(&ci, &device->config_rom[5]);
108 while (fw_csr_iterator_next(&ci, &key, &value)) {
119 fw_csr_iterator_init(&ci, unit->directory);
120 while (fw_csr_iterator_next(&ci, &key, &value)) {
122 case CSR_SPECIFIER_ID:
123 specifier_id = value;
131 return snprintf(buffer, buffer_size,
132 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
133 vendor, model, specifier_id, version);
137 fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
139 struct fw_unit *unit = fw_unit(dev);
142 get_modalias(unit, modalias, sizeof(modalias));
144 if (add_uevent_var(env, "MODALIAS=%s", modalias))
150 struct bus_type fw_bus_type = {
152 .match = fw_unit_match,
154 EXPORT_SYMBOL(fw_bus_type);
156 static void fw_device_release(struct device *dev)
158 struct fw_device *device = fw_device(dev);
159 struct fw_card *card = device->card;
163 * Take the card lock so we don't set this to NULL while a
164 * FW_NODE_UPDATED callback is being handled or while the
165 * bus manager work looks at this node.
167 spin_lock_irqsave(&card->lock, flags);
168 device->node->data = NULL;
169 spin_unlock_irqrestore(&card->lock, flags);
171 fw_node_put(device->node);
172 kfree(device->config_rom);
177 int fw_device_enable_phys_dma(struct fw_device *device)
179 int generation = device->generation;
181 /* device->node_id, accessed below, must not be older than generation */
184 return device->card->driver->enable_phys_dma(device->card,
188 EXPORT_SYMBOL(fw_device_enable_phys_dma);
190 struct config_rom_attribute {
191 struct device_attribute attr;
196 show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
198 struct config_rom_attribute *attr =
199 container_of(dattr, struct config_rom_attribute, attr);
200 struct fw_csr_iterator ci;
202 int key, value, ret = -ENOENT;
204 down_read(&fw_device_rwsem);
207 dir = fw_unit(dev)->directory;
209 dir = fw_device(dev)->config_rom + 5;
211 fw_csr_iterator_init(&ci, dir);
212 while (fw_csr_iterator_next(&ci, &key, &value))
213 if (attr->key == key) {
214 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
219 up_read(&fw_device_rwsem);
224 #define IMMEDIATE_ATTR(name, key) \
225 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
228 show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
230 struct config_rom_attribute *attr =
231 container_of(dattr, struct config_rom_attribute, attr);
232 struct fw_csr_iterator ci;
233 u32 *dir, *block = NULL, *p, *end;
234 int length, key, value, last_key = 0, ret = -ENOENT;
237 down_read(&fw_device_rwsem);
240 dir = fw_unit(dev)->directory;
242 dir = fw_device(dev)->config_rom + 5;
244 fw_csr_iterator_init(&ci, dir);
245 while (fw_csr_iterator_next(&ci, &key, &value)) {
246 if (attr->key == last_key &&
247 key == (CSR_DESCRIPTOR | CSR_LEAF))
248 block = ci.p - 1 + value;
255 length = min(block[0] >> 16, 256U);
259 if (block[1] != 0 || block[2] != 0)
260 /* Unknown encoding. */
269 end = &block[length + 1];
270 for (p = &block[3]; p < end; p++, b += 4)
271 * (u32 *) b = (__force u32) __cpu_to_be32(*p);
273 /* Strip trailing whitespace and add newline. */
274 while (b--, (isspace(*b) || *b == '\0') && b > buf);
278 up_read(&fw_device_rwsem);
283 #define TEXT_LEAF_ATTR(name, key) \
284 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
286 static struct config_rom_attribute config_rom_attributes[] = {
287 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
288 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
289 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
290 IMMEDIATE_ATTR(version, CSR_VERSION),
291 IMMEDIATE_ATTR(model, CSR_MODEL),
292 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
293 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
294 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
298 init_fw_attribute_group(struct device *dev,
299 struct device_attribute *attrs,
300 struct fw_attribute_group *group)
302 struct device_attribute *attr;
305 for (j = 0; attrs[j].attr.name != NULL; j++)
306 group->attrs[j] = &attrs[j].attr;
308 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
309 attr = &config_rom_attributes[i].attr;
310 if (attr->show(dev, attr, NULL) < 0)
312 group->attrs[j++] = &attr->attr;
315 BUG_ON(j >= ARRAY_SIZE(group->attrs));
316 group->attrs[j++] = NULL;
317 group->groups[0] = &group->group;
318 group->groups[1] = NULL;
319 group->group.attrs = group->attrs;
320 dev->groups = group->groups;
324 modalias_show(struct device *dev,
325 struct device_attribute *attr, char *buf)
327 struct fw_unit *unit = fw_unit(dev);
330 length = get_modalias(unit, buf, PAGE_SIZE);
331 strcpy(buf + length, "\n");
337 rom_index_show(struct device *dev,
338 struct device_attribute *attr, char *buf)
340 struct fw_device *device = fw_device(dev->parent);
341 struct fw_unit *unit = fw_unit(dev);
343 return snprintf(buf, PAGE_SIZE, "%d\n",
344 (int)(unit->directory - device->config_rom));
347 static struct device_attribute fw_unit_attributes[] = {
349 __ATTR_RO(rom_index),
354 config_rom_show(struct device *dev, struct device_attribute *attr, char *buf)
356 struct fw_device *device = fw_device(dev);
359 down_read(&fw_device_rwsem);
360 length = device->config_rom_length * 4;
361 memcpy(buf, device->config_rom, length);
362 up_read(&fw_device_rwsem);
368 guid_show(struct device *dev, struct device_attribute *attr, char *buf)
370 struct fw_device *device = fw_device(dev);
373 down_read(&fw_device_rwsem);
374 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
375 device->config_rom[3], device->config_rom[4]);
376 up_read(&fw_device_rwsem);
381 static struct device_attribute fw_device_attributes[] = {
382 __ATTR_RO(config_rom),
388 read_rom(struct fw_device *device, int generation, int index, u32 *data)
392 /* device->node_id, accessed below, must not be older than generation */
395 rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST,
396 device->node_id, generation, device->max_speed,
397 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4,
404 #define READ_BIB_ROM_SIZE 256
405 #define READ_BIB_STACK_SIZE 16
408 * Read the bus info block, perform a speed probe, and read all of the rest of
409 * the config ROM. We do all this with a cached bus generation. If the bus
410 * generation changes under us, read_bus_info_block will fail and get retried.
411 * It's better to start all over in this case because the node from which we
412 * are reading the ROM may have changed the ROM during the reset.
414 static int read_bus_info_block(struct fw_device *device, int generation)
416 u32 *rom, *stack, *old_rom, *new_rom;
418 int i, end, length, ret = -1;
420 rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
421 sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
425 stack = &rom[READ_BIB_ROM_SIZE];
427 device->max_speed = SCODE_100;
429 /* First read the bus info block. */
430 for (i = 0; i < 5; i++) {
431 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
434 * As per IEEE1212 7.2, during power-up, devices can
435 * reply with a 0 for the first quadlet of the config
436 * rom to indicate that they are booting (for example,
437 * if the firmware is on the disk of a external
438 * harddisk). In that case we just fail, and the
439 * retry mechanism will try again later.
441 if (i == 0 && rom[i] == 0)
445 device->max_speed = device->node->max_speed;
448 * Determine the speed of
449 * - devices with link speed less than PHY speed,
450 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
451 * - all devices if there are 1394b repeaters.
452 * Note, we cannot use the bus info block's link_spd as starting point
453 * because some buggy firmwares set it lower than necessary and because
454 * 1394-1995 nodes do not have the field.
456 if ((rom[2] & 0x7) < device->max_speed ||
457 device->max_speed == SCODE_BETA ||
458 device->card->beta_repeaters_present) {
461 /* for S1600 and S3200 */
462 if (device->max_speed == SCODE_BETA)
463 device->max_speed = device->card->link_speed;
465 while (device->max_speed > SCODE_100) {
466 if (read_rom(device, generation, 0, &dummy) ==
474 * Now parse the config rom. The config rom is a recursive
475 * directory structure so we parse it using a stack of
476 * references to the blocks that make up the structure. We
477 * push a reference to the root directory on the stack to
482 stack[sp++] = 0xc0000005;
485 * Pop the next block reference of the stack. The
486 * lower 24 bits is the offset into the config rom,
487 * the upper 8 bits are the type of the reference the
492 if (i >= READ_BIB_ROM_SIZE)
494 * The reference points outside the standard
495 * config rom area, something's fishy.
499 /* Read header quadlet for the block to get the length. */
500 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
502 end = i + (rom[i] >> 16) + 1;
504 if (end > READ_BIB_ROM_SIZE)
506 * This block extends outside standard config
507 * area (and the array we're reading it
508 * into). That's broken, so ignore this
514 * Now read in the block. If this is a directory
515 * block, check the entries as we read them to see if
516 * it references another block, and push it in that case.
519 if (read_rom(device, generation, i, &rom[i]) !=
522 if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
523 sp < READ_BIB_STACK_SIZE)
524 stack[sp++] = i + rom[i];
531 old_rom = device->config_rom;
532 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
536 down_write(&fw_device_rwsem);
537 device->config_rom = new_rom;
538 device->config_rom_length = length;
539 up_write(&fw_device_rwsem);
543 device->cmc = rom[2] & 1 << 30;
550 static void fw_unit_release(struct device *dev)
552 struct fw_unit *unit = fw_unit(dev);
557 static struct device_type fw_unit_type = {
558 .uevent = fw_unit_uevent,
559 .release = fw_unit_release,
562 static int is_fw_unit(struct device *dev)
564 return dev->type == &fw_unit_type;
567 static void create_units(struct fw_device *device)
569 struct fw_csr_iterator ci;
570 struct fw_unit *unit;
574 fw_csr_iterator_init(&ci, &device->config_rom[5]);
575 while (fw_csr_iterator_next(&ci, &key, &value)) {
576 if (key != (CSR_UNIT | CSR_DIRECTORY))
580 * Get the address of the unit directory and try to
581 * match the drivers id_tables against it.
583 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
585 fw_error("failed to allocate memory for unit\n");
589 unit->directory = ci.p + value - 1;
590 unit->device.bus = &fw_bus_type;
591 unit->device.type = &fw_unit_type;
592 unit->device.parent = &device->device;
593 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
595 init_fw_attribute_group(&unit->device,
597 &unit->attribute_group);
598 if (device_register(&unit->device) < 0)
608 static int shutdown_unit(struct device *device, void *data)
610 device_unregister(device);
616 * fw_device_rwsem acts as dual purpose mutex:
617 * - serializes accesses to fw_device_idr,
618 * - serializes accesses to fw_device.config_rom/.config_rom_length and
619 * fw_unit.directory, unless those accesses happen at safe occasions
621 DECLARE_RWSEM(fw_device_rwsem);
623 DEFINE_IDR(fw_device_idr);
626 struct fw_device *fw_device_get_by_devt(dev_t devt)
628 struct fw_device *device;
630 down_read(&fw_device_rwsem);
631 device = idr_find(&fw_device_idr, MINOR(devt));
633 fw_device_get(device);
634 up_read(&fw_device_rwsem);
640 * These defines control the retry behavior for reading the config
641 * rom. It shouldn't be necessary to tweak these; if the device
642 * doesn't respond to a config rom read within 10 seconds, it's not
643 * going to respond at all. As for the initial delay, a lot of
644 * devices will be able to respond within half a second after bus
645 * reset. On the other hand, it's not really worth being more
646 * aggressive than that, since it scales pretty well; if 10 devices
647 * are plugged in, they're all getting read within one second.
650 #define MAX_RETRIES 10
651 #define RETRY_DELAY (3 * HZ)
652 #define INITIAL_DELAY (HZ / 2)
653 #define SHUTDOWN_DELAY (2 * HZ)
655 static void fw_device_shutdown(struct work_struct *work)
657 struct fw_device *device =
658 container_of(work, struct fw_device, work.work);
659 int minor = MINOR(device->device.devt);
661 if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY)
662 && !list_empty(&device->card->link)) {
663 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
667 if (atomic_cmpxchg(&device->state,
669 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
672 fw_device_cdev_remove(device);
673 device_for_each_child(&device->device, NULL, shutdown_unit);
674 device_unregister(&device->device);
676 down_write(&fw_device_rwsem);
677 idr_remove(&fw_device_idr, minor);
678 up_write(&fw_device_rwsem);
680 fw_device_put(device);
683 static struct device_type fw_device_type = {
684 .release = fw_device_release,
687 static void fw_device_update(struct work_struct *work);
690 * If a device was pending for deletion because its node went away but its
691 * bus info block and root directory header matches that of a newly discovered
692 * device, revive the existing fw_device.
693 * The newly allocated fw_device becomes obsolete instead.
695 static int lookup_existing_device(struct device *dev, void *data)
697 struct fw_device *old = fw_device(dev);
698 struct fw_device *new = data;
699 struct fw_card *card = new->card;
702 down_read(&fw_device_rwsem); /* serialize config_rom access */
703 spin_lock_irq(&card->lock); /* serialize node access */
705 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
706 atomic_cmpxchg(&old->state,
708 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
709 struct fw_node *current_node = new->node;
710 struct fw_node *obsolete_node = old->node;
712 new->node = obsolete_node;
713 new->node->data = new;
714 old->node = current_node;
715 old->node->data = old;
717 old->max_speed = new->max_speed;
718 old->node_id = current_node->node_id;
719 smp_wmb(); /* update node_id before generation */
720 old->generation = card->generation;
721 old->config_rom_retries = 0;
722 fw_notify("rediscovered device %s\n", dev_name(dev));
724 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
725 schedule_delayed_work(&old->work, 0);
727 if (current_node == card->root_node)
728 fw_schedule_bm_work(card, 0);
733 spin_unlock_irq(&card->lock);
734 up_read(&fw_device_rwsem);
739 static void fw_device_init(struct work_struct *work)
741 struct fw_device *device =
742 container_of(work, struct fw_device, work.work);
743 struct device *revived_dev;
747 * All failure paths here set node->data to NULL, so that we
748 * don't try to do device_for_each_child() on a kfree()'d
752 if (read_bus_info_block(device, device->generation) < 0) {
753 if (device->config_rom_retries < MAX_RETRIES &&
754 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
755 device->config_rom_retries++;
756 schedule_delayed_work(&device->work, RETRY_DELAY);
758 fw_notify("giving up on config rom for node id %x\n",
760 if (device->node == device->card->root_node)
761 fw_schedule_bm_work(device->card, 0);
762 fw_device_release(&device->device);
767 revived_dev = device_find_child(device->card->device,
768 device, lookup_existing_device);
770 put_device(revived_dev);
771 fw_device_release(&device->device);
776 device_initialize(&device->device);
778 fw_device_get(device);
779 down_write(&fw_device_rwsem);
780 err = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
781 idr_get_new(&fw_device_idr, device, &minor) :
783 up_write(&fw_device_rwsem);
788 device->device.bus = &fw_bus_type;
789 device->device.type = &fw_device_type;
790 device->device.parent = device->card->device;
791 device->device.devt = MKDEV(fw_cdev_major, minor);
792 dev_set_name(&device->device, "fw%d", minor);
794 init_fw_attribute_group(&device->device,
795 fw_device_attributes,
796 &device->attribute_group);
797 if (device_add(&device->device)) {
798 fw_error("Failed to add device.\n");
799 goto error_with_cdev;
802 create_units(device);
805 * Transition the device to running state. If it got pulled
806 * out from under us while we did the intialization work, we
807 * have to shut down the device again here. Normally, though,
808 * fw_node_event will be responsible for shutting it down when
809 * necessary. We have to use the atomic cmpxchg here to avoid
810 * racing with the FW_NODE_DESTROYED case in
813 if (atomic_cmpxchg(&device->state,
814 FW_DEVICE_INITIALIZING,
815 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
816 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
817 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
819 if (device->config_rom_retries)
820 fw_notify("created device %s: GUID %08x%08x, S%d00, "
821 "%d config ROM retries\n",
822 dev_name(&device->device),
823 device->config_rom[3], device->config_rom[4],
824 1 << device->max_speed,
825 device->config_rom_retries);
827 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
828 dev_name(&device->device),
829 device->config_rom[3], device->config_rom[4],
830 1 << device->max_speed);
831 device->config_rom_retries = 0;
835 * Reschedule the IRM work if we just finished reading the
836 * root node config rom. If this races with a bus reset we
837 * just end up running the IRM work a couple of extra times -
840 if (device->node == device->card->root_node)
841 fw_schedule_bm_work(device->card, 0);
846 down_write(&fw_device_rwsem);
847 idr_remove(&fw_device_idr, minor);
848 up_write(&fw_device_rwsem);
850 fw_device_put(device); /* fw_device_idr's reference */
852 put_device(&device->device); /* our reference */
855 static int update_unit(struct device *dev, void *data)
857 struct fw_unit *unit = fw_unit(dev);
858 struct fw_driver *driver = (struct fw_driver *)dev->driver;
860 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
862 driver->update(unit);
869 static void fw_device_update(struct work_struct *work)
871 struct fw_device *device =
872 container_of(work, struct fw_device, work.work);
874 fw_device_cdev_update(device);
875 device_for_each_child(&device->device, NULL, update_unit);
881 REREAD_BIB_UNCHANGED,
885 /* Reread and compare bus info block and header of root directory */
886 static int reread_bus_info_block(struct fw_device *device, int generation)
891 for (i = 0; i < 6; i++) {
892 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
893 return REREAD_BIB_ERROR;
895 if (i == 0 && q == 0)
896 return REREAD_BIB_GONE;
898 if (i > device->config_rom_length || q != device->config_rom[i])
899 return REREAD_BIB_CHANGED;
902 return REREAD_BIB_UNCHANGED;
905 static void fw_device_refresh(struct work_struct *work)
907 struct fw_device *device =
908 container_of(work, struct fw_device, work.work);
909 struct fw_card *card = device->card;
910 int node_id = device->node_id;
912 switch (reread_bus_info_block(device, device->generation)) {
913 case REREAD_BIB_ERROR:
914 if (device->config_rom_retries < MAX_RETRIES / 2 &&
915 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
916 device->config_rom_retries++;
917 schedule_delayed_work(&device->work, RETRY_DELAY / 2);
923 case REREAD_BIB_GONE:
926 case REREAD_BIB_UNCHANGED:
927 if (atomic_cmpxchg(&device->state,
928 FW_DEVICE_INITIALIZING,
929 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
932 fw_device_update(work);
933 device->config_rom_retries = 0;
936 case REREAD_BIB_CHANGED:
941 * Something changed. We keep things simple and don't investigate
942 * further. We just destroy all previous units and create new ones.
944 device_for_each_child(&device->device, NULL, shutdown_unit);
946 if (read_bus_info_block(device, device->generation) < 0) {
947 if (device->config_rom_retries < MAX_RETRIES &&
948 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
949 device->config_rom_retries++;
950 schedule_delayed_work(&device->work, RETRY_DELAY);
957 create_units(device);
959 if (atomic_cmpxchg(&device->state,
960 FW_DEVICE_INITIALIZING,
961 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
964 fw_notify("refreshed device %s\n", dev_name(&device->device));
965 device->config_rom_retries = 0;
969 fw_notify("giving up on refresh of device %s\n", dev_name(&device->device));
971 atomic_set(&device->state, FW_DEVICE_GONE);
972 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
973 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
975 if (node_id == card->root_node->node_id)
976 fw_schedule_bm_work(card, 0);
979 void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
981 struct fw_device *device;
984 case FW_NODE_CREATED:
985 case FW_NODE_LINK_ON:
989 device = kzalloc(sizeof(*device), GFP_ATOMIC);
994 * Do minimal intialization of the device here, the
995 * rest will happen in fw_device_init().
997 * Attention: A lot of things, even fw_device_get(),
998 * cannot be done before fw_device_init() finished!
999 * You can basically just check device->state and
1000 * schedule work until then, but only while holding
1003 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
1004 device->card = fw_card_get(card);
1005 device->node = fw_node_get(node);
1006 device->node_id = node->node_id;
1007 device->generation = card->generation;
1008 spin_lock_init(&device->client_list_lock);
1009 INIT_LIST_HEAD(&device->client_list);
1012 * Set the node data to point back to this device so
1013 * FW_NODE_UPDATED callbacks can update the node_id
1014 * and generation for the device.
1016 node->data = device;
1019 * Many devices are slow to respond after bus resets,
1020 * especially if they are bus powered and go through
1021 * power-up after getting plugged in. We schedule the
1022 * first config rom scan half a second after bus reset.
1024 INIT_DELAYED_WORK(&device->work, fw_device_init);
1025 schedule_delayed_work(&device->work, INITIAL_DELAY);
1028 case FW_NODE_INITIATED_RESET:
1029 device = node->data;
1033 device->node_id = node->node_id;
1034 smp_wmb(); /* update node_id before generation */
1035 device->generation = card->generation;
1036 if (atomic_cmpxchg(&device->state,
1038 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1039 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
1040 schedule_delayed_work(&device->work,
1041 node == card->local_node ? 0 : INITIAL_DELAY);
1045 case FW_NODE_UPDATED:
1046 if (!node->link_on || node->data == NULL)
1049 device = node->data;
1050 device->node_id = node->node_id;
1051 smp_wmb(); /* update node_id before generation */
1052 device->generation = card->generation;
1053 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1054 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
1055 schedule_delayed_work(&device->work, 0);
1059 case FW_NODE_DESTROYED:
1060 case FW_NODE_LINK_OFF:
1065 * Destroy the device associated with the node. There
1066 * are two cases here: either the device is fully
1067 * initialized (FW_DEVICE_RUNNING) or we're in the
1068 * process of reading its config rom
1069 * (FW_DEVICE_INITIALIZING). If it is fully
1070 * initialized we can reuse device->work to schedule a
1071 * full fw_device_shutdown(). If not, there's work
1072 * scheduled to read it's config rom, and we just put
1073 * the device in shutdown state to have that code fail
1074 * to create the device.
1076 device = node->data;
1077 if (atomic_xchg(&device->state,
1078 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
1079 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1080 schedule_delayed_work(&device->work,
1081 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);