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/string.h>
29 #include <asm/semaphore.h>
30 #include <asm/system.h>
31 #include <linux/ctype.h>
32 #include "fw-transaction.h"
33 #include "fw-topology.h"
34 #include "fw-device.h"
36 void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
39 ci->end = ci->p + (p[0] >> 16);
41 EXPORT_SYMBOL(fw_csr_iterator_init);
43 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
46 *value = *ci->p & 0xffffff;
48 return ci->p++ < ci->end;
50 EXPORT_SYMBOL(fw_csr_iterator_next);
52 static int is_fw_unit(struct device *dev);
54 static int match_unit_directory(u32 * directory, const struct fw_device_id *id)
56 struct fw_csr_iterator ci;
57 int key, value, match;
60 fw_csr_iterator_init(&ci, directory);
61 while (fw_csr_iterator_next(&ci, &key, &value)) {
62 if (key == CSR_VENDOR && value == id->vendor)
63 match |= FW_MATCH_VENDOR;
64 if (key == CSR_MODEL && value == id->model)
65 match |= FW_MATCH_MODEL;
66 if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
67 match |= FW_MATCH_SPECIFIER_ID;
68 if (key == CSR_VERSION && value == id->version)
69 match |= FW_MATCH_VERSION;
72 return (match & id->match_flags) == id->match_flags;
75 static int fw_unit_match(struct device *dev, struct device_driver *drv)
77 struct fw_unit *unit = fw_unit(dev);
78 struct fw_driver *driver = fw_driver(drv);
81 /* We only allow binding to fw_units. */
85 for (i = 0; driver->id_table[i].match_flags != 0; i++) {
86 if (match_unit_directory(unit->directory, &driver->id_table[i]))
93 static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
95 struct fw_device *device = fw_device(unit->device.parent);
96 struct fw_csr_iterator ci;
101 int specifier_id = 0;
104 fw_csr_iterator_init(&ci, &device->config_rom[5]);
105 while (fw_csr_iterator_next(&ci, &key, &value)) {
116 fw_csr_iterator_init(&ci, unit->directory);
117 while (fw_csr_iterator_next(&ci, &key, &value)) {
119 case CSR_SPECIFIER_ID:
120 specifier_id = value;
128 return snprintf(buffer, buffer_size,
129 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
130 vendor, model, specifier_id, version);
134 fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
136 struct fw_unit *unit = fw_unit(dev);
139 get_modalias(unit, modalias, sizeof(modalias));
141 if (add_uevent_var(env, "MODALIAS=%s", modalias))
147 struct bus_type fw_bus_type = {
149 .match = fw_unit_match,
151 EXPORT_SYMBOL(fw_bus_type);
153 static void fw_device_release(struct device *dev)
155 struct fw_device *device = fw_device(dev);
156 struct fw_card *card = device->card;
160 * Take the card lock so we don't set this to NULL while a
161 * FW_NODE_UPDATED callback is being handled.
163 spin_lock_irqsave(&card->lock, flags);
164 device->node->data = NULL;
165 spin_unlock_irqrestore(&card->lock, flags);
167 fw_node_put(device->node);
168 kfree(device->config_rom);
170 atomic_dec(&card->device_count);
173 int fw_device_enable_phys_dma(struct fw_device *device)
175 int generation = device->generation;
177 /* device->node_id, accessed below, must not be older than generation */
180 return device->card->driver->enable_phys_dma(device->card,
184 EXPORT_SYMBOL(fw_device_enable_phys_dma);
186 struct config_rom_attribute {
187 struct device_attribute attr;
192 show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
194 struct config_rom_attribute *attr =
195 container_of(dattr, struct config_rom_attribute, attr);
196 struct fw_csr_iterator ci;
198 int key, value, ret = -ENOENT;
200 down_read(&fw_device_rwsem);
203 dir = fw_unit(dev)->directory;
205 dir = fw_device(dev)->config_rom + 5;
207 fw_csr_iterator_init(&ci, dir);
208 while (fw_csr_iterator_next(&ci, &key, &value))
209 if (attr->key == key) {
210 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
215 up_read(&fw_device_rwsem);
220 #define IMMEDIATE_ATTR(name, key) \
221 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
224 show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
226 struct config_rom_attribute *attr =
227 container_of(dattr, struct config_rom_attribute, attr);
228 struct fw_csr_iterator ci;
229 u32 *dir, *block = NULL, *p, *end;
230 int length, key, value, last_key = 0, ret = -ENOENT;
233 down_read(&fw_device_rwsem);
236 dir = fw_unit(dev)->directory;
238 dir = fw_device(dev)->config_rom + 5;
240 fw_csr_iterator_init(&ci, dir);
241 while (fw_csr_iterator_next(&ci, &key, &value)) {
242 if (attr->key == last_key &&
243 key == (CSR_DESCRIPTOR | CSR_LEAF))
244 block = ci.p - 1 + value;
251 length = min(block[0] >> 16, 256U);
255 if (block[1] != 0 || block[2] != 0)
256 /* Unknown encoding. */
265 end = &block[length + 1];
266 for (p = &block[3]; p < end; p++, b += 4)
267 * (u32 *) b = (__force u32) __cpu_to_be32(*p);
269 /* Strip trailing whitespace and add newline. */
270 while (b--, (isspace(*b) || *b == '\0') && b > buf);
274 up_read(&fw_device_rwsem);
279 #define TEXT_LEAF_ATTR(name, key) \
280 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
282 static struct config_rom_attribute config_rom_attributes[] = {
283 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
284 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
285 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
286 IMMEDIATE_ATTR(version, CSR_VERSION),
287 IMMEDIATE_ATTR(model, CSR_MODEL),
288 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
289 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
290 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
294 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 BUG_ON(j >= ARRAY_SIZE(group->attrs));
312 group->attrs[j++] = NULL;
313 group->groups[0] = &group->group;
314 group->groups[1] = NULL;
315 group->group.attrs = group->attrs;
316 dev->groups = group->groups;
320 modalias_show(struct device *dev,
321 struct device_attribute *attr, char *buf)
323 struct fw_unit *unit = fw_unit(dev);
326 length = get_modalias(unit, buf, PAGE_SIZE);
327 strcpy(buf + length, "\n");
333 rom_index_show(struct device *dev,
334 struct device_attribute *attr, char *buf)
336 struct fw_device *device = fw_device(dev->parent);
337 struct fw_unit *unit = fw_unit(dev);
339 return snprintf(buf, PAGE_SIZE, "%d\n",
340 (int)(unit->directory - device->config_rom));
343 static struct device_attribute fw_unit_attributes[] = {
345 __ATTR_RO(rom_index),
350 config_rom_show(struct device *dev, struct device_attribute *attr, char *buf)
352 struct fw_device *device = fw_device(dev);
355 down_read(&fw_device_rwsem);
356 length = device->config_rom_length * 4;
357 memcpy(buf, device->config_rom, length);
358 up_read(&fw_device_rwsem);
364 guid_show(struct device *dev, struct device_attribute *attr, char *buf)
366 struct fw_device *device = fw_device(dev);
369 down_read(&fw_device_rwsem);
370 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
371 device->config_rom[3], device->config_rom[4]);
372 up_read(&fw_device_rwsem);
377 static struct device_attribute fw_device_attributes[] = {
378 __ATTR_RO(config_rom),
383 struct read_quadlet_callback_data {
384 struct completion done;
390 complete_transaction(struct fw_card *card, int rcode,
391 void *payload, size_t length, void *data)
393 struct read_quadlet_callback_data *callback_data = data;
395 if (rcode == RCODE_COMPLETE)
396 callback_data->data = be32_to_cpu(*(__be32 *)payload);
397 callback_data->rcode = rcode;
398 complete(&callback_data->done);
402 read_rom(struct fw_device *device, int generation, int index, u32 *data)
404 struct read_quadlet_callback_data callback_data;
405 struct fw_transaction t;
408 /* device->node_id, accessed below, must not be older than generation */
411 init_completion(&callback_data.done);
413 offset = 0xfffff0000400ULL + index * 4;
414 fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
415 device->node_id, generation, device->max_speed,
416 offset, NULL, 4, complete_transaction, &callback_data);
418 wait_for_completion(&callback_data.done);
420 *data = callback_data.data;
422 return callback_data.rcode;
425 #define READ_BIB_ROM_SIZE 256
426 #define READ_BIB_STACK_SIZE 16
429 * Read the bus info block, perform a speed probe, and read all of the rest of
430 * the config ROM. We do all this with a cached bus generation. If the bus
431 * generation changes under us, read_bus_info_block will fail and get retried.
432 * It's better to start all over in this case because the node from which we
433 * are reading the ROM may have changed the ROM during the reset.
435 static int read_bus_info_block(struct fw_device *device, int generation)
437 u32 *rom, *stack, *old_rom, *new_rom;
439 int i, end, length, ret = -1;
441 rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
442 sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
446 stack = &rom[READ_BIB_ROM_SIZE];
448 device->max_speed = SCODE_100;
450 /* First read the bus info block. */
451 for (i = 0; i < 5; i++) {
452 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
455 * As per IEEE1212 7.2, during power-up, devices can
456 * reply with a 0 for the first quadlet of the config
457 * rom to indicate that they are booting (for example,
458 * if the firmware is on the disk of a external
459 * harddisk). In that case we just fail, and the
460 * retry mechanism will try again later.
462 if (i == 0 && rom[i] == 0)
466 device->max_speed = device->node->max_speed;
469 * Determine the speed of
470 * - devices with link speed less than PHY speed,
471 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
472 * - all devices if there are 1394b repeaters.
473 * Note, we cannot use the bus info block's link_spd as starting point
474 * because some buggy firmwares set it lower than necessary and because
475 * 1394-1995 nodes do not have the field.
477 if ((rom[2] & 0x7) < device->max_speed ||
478 device->max_speed == SCODE_BETA ||
479 device->card->beta_repeaters_present) {
482 /* for S1600 and S3200 */
483 if (device->max_speed == SCODE_BETA)
484 device->max_speed = device->card->link_speed;
486 while (device->max_speed > SCODE_100) {
487 if (read_rom(device, generation, 0, &dummy) ==
495 * Now parse the config rom. The config rom is a recursive
496 * directory structure so we parse it using a stack of
497 * references to the blocks that make up the structure. We
498 * push a reference to the root directory on the stack to
503 stack[sp++] = 0xc0000005;
506 * Pop the next block reference of the stack. The
507 * lower 24 bits is the offset into the config rom,
508 * the upper 8 bits are the type of the reference the
513 if (i >= READ_BIB_ROM_SIZE)
515 * The reference points outside the standard
516 * config rom area, something's fishy.
520 /* Read header quadlet for the block to get the length. */
521 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
523 end = i + (rom[i] >> 16) + 1;
525 if (end > READ_BIB_ROM_SIZE)
527 * This block extends outside standard config
528 * area (and the array we're reading it
529 * into). That's broken, so ignore this
535 * Now read in the block. If this is a directory
536 * block, check the entries as we read them to see if
537 * it references another block, and push it in that case.
540 if (read_rom(device, generation, i, &rom[i]) !=
543 if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
544 sp < READ_BIB_STACK_SIZE)
545 stack[sp++] = i + rom[i];
552 old_rom = device->config_rom;
553 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
557 down_write(&fw_device_rwsem);
558 device->config_rom = new_rom;
559 device->config_rom_length = length;
560 up_write(&fw_device_rwsem);
564 device->cmc = rom[2] & 1 << 30;
571 static void fw_unit_release(struct device *dev)
573 struct fw_unit *unit = fw_unit(dev);
578 static struct device_type fw_unit_type = {
579 .uevent = fw_unit_uevent,
580 .release = fw_unit_release,
583 static int is_fw_unit(struct device *dev)
585 return dev->type == &fw_unit_type;
588 static void create_units(struct fw_device *device)
590 struct fw_csr_iterator ci;
591 struct fw_unit *unit;
595 fw_csr_iterator_init(&ci, &device->config_rom[5]);
596 while (fw_csr_iterator_next(&ci, &key, &value)) {
597 if (key != (CSR_UNIT | CSR_DIRECTORY))
601 * Get the address of the unit directory and try to
602 * match the drivers id_tables against it.
604 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
606 fw_error("failed to allocate memory for unit\n");
610 unit->directory = ci.p + value - 1;
611 unit->device.bus = &fw_bus_type;
612 unit->device.type = &fw_unit_type;
613 unit->device.parent = &device->device;
614 snprintf(unit->device.bus_id, sizeof(unit->device.bus_id),
615 "%s.%d", device->device.bus_id, i++);
617 init_fw_attribute_group(&unit->device,
619 &unit->attribute_group);
620 if (device_register(&unit->device) < 0)
630 static int shutdown_unit(struct device *device, void *data)
632 device_unregister(device);
638 * fw_device_rwsem acts as dual purpose mutex:
639 * - serializes accesses to fw_device_idr,
640 * - serializes accesses to fw_device.config_rom/.config_rom_length and
641 * fw_unit.directory, unless those accesses happen at safe occasions
643 DECLARE_RWSEM(fw_device_rwsem);
645 static DEFINE_IDR(fw_device_idr);
648 struct fw_device *fw_device_get_by_devt(dev_t devt)
650 struct fw_device *device;
652 down_read(&fw_device_rwsem);
653 device = idr_find(&fw_device_idr, MINOR(devt));
655 fw_device_get(device);
656 up_read(&fw_device_rwsem);
661 static void fw_device_shutdown(struct work_struct *work)
663 struct fw_device *device =
664 container_of(work, struct fw_device, work.work);
665 int minor = MINOR(device->device.devt);
667 fw_device_cdev_remove(device);
668 device_for_each_child(&device->device, NULL, shutdown_unit);
669 device_unregister(&device->device);
671 down_write(&fw_device_rwsem);
672 idr_remove(&fw_device_idr, minor);
673 up_write(&fw_device_rwsem);
674 fw_device_put(device);
677 static struct device_type fw_device_type = {
678 .release = fw_device_release,
682 * These defines control the retry behavior for reading the config
683 * rom. It shouldn't be necessary to tweak these; if the device
684 * doesn't respond to a config rom read within 10 seconds, it's not
685 * going to respond at all. As for the initial delay, a lot of
686 * devices will be able to respond within half a second after bus
687 * reset. On the other hand, it's not really worth being more
688 * aggressive than that, since it scales pretty well; if 10 devices
689 * are plugged in, they're all getting read within one second.
692 #define MAX_RETRIES 10
693 #define RETRY_DELAY (3 * HZ)
694 #define INITIAL_DELAY (HZ / 2)
696 static void fw_device_init(struct work_struct *work)
698 struct fw_device *device =
699 container_of(work, struct fw_device, work.work);
703 * All failure paths here set node->data to NULL, so that we
704 * don't try to do device_for_each_child() on a kfree()'d
708 if (read_bus_info_block(device, device->generation) < 0) {
709 if (device->config_rom_retries < MAX_RETRIES &&
710 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
711 device->config_rom_retries++;
712 schedule_delayed_work(&device->work, RETRY_DELAY);
714 fw_notify("giving up on config rom for node id %x\n",
716 if (device->node == device->card->root_node)
717 schedule_delayed_work(&device->card->work, 0);
718 fw_device_release(&device->device);
725 fw_device_get(device);
726 down_write(&fw_device_rwsem);
727 if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
728 err = idr_get_new(&fw_device_idr, device, &minor);
729 up_write(&fw_device_rwsem);
734 device->device.bus = &fw_bus_type;
735 device->device.type = &fw_device_type;
736 device->device.parent = device->card->device;
737 device->device.devt = MKDEV(fw_cdev_major, minor);
738 snprintf(device->device.bus_id, sizeof(device->device.bus_id),
741 init_fw_attribute_group(&device->device,
742 fw_device_attributes,
743 &device->attribute_group);
744 if (device_add(&device->device)) {
745 fw_error("Failed to add device.\n");
746 goto error_with_cdev;
749 create_units(device);
752 * Transition the device to running state. If it got pulled
753 * out from under us while we did the intialization work, we
754 * have to shut down the device again here. Normally, though,
755 * fw_node_event will be responsible for shutting it down when
756 * necessary. We have to use the atomic cmpxchg here to avoid
757 * racing with the FW_NODE_DESTROYED case in
760 if (atomic_cmpxchg(&device->state,
761 FW_DEVICE_INITIALIZING,
762 FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) {
763 fw_device_shutdown(work);
765 if (device->config_rom_retries)
766 fw_notify("created device %s: GUID %08x%08x, S%d00, "
767 "%d config ROM retries\n",
768 device->device.bus_id,
769 device->config_rom[3], device->config_rom[4],
770 1 << device->max_speed,
771 device->config_rom_retries);
773 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
774 device->device.bus_id,
775 device->config_rom[3], device->config_rom[4],
776 1 << device->max_speed);
777 device->config_rom_retries = 0;
781 * Reschedule the IRM work if we just finished reading the
782 * root node config rom. If this races with a bus reset we
783 * just end up running the IRM work a couple of extra times -
786 if (device->node == device->card->root_node)
787 schedule_delayed_work(&device->card->work, 0);
792 down_write(&fw_device_rwsem);
793 idr_remove(&fw_device_idr, minor);
794 up_write(&fw_device_rwsem);
796 fw_device_put(device); /* fw_device_idr's reference */
798 put_device(&device->device); /* our reference */
801 static int update_unit(struct device *dev, void *data)
803 struct fw_unit *unit = fw_unit(dev);
804 struct fw_driver *driver = (struct fw_driver *)dev->driver;
806 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
808 driver->update(unit);
815 static void fw_device_update(struct work_struct *work)
817 struct fw_device *device =
818 container_of(work, struct fw_device, work.work);
820 fw_device_cdev_update(device);
821 device_for_each_child(&device->device, NULL, update_unit);
827 REREAD_BIB_UNCHANGED,
831 /* Reread and compare bus info block and header of root directory */
832 static int reread_bus_info_block(struct fw_device *device, int generation)
837 for (i = 0; i < 6; i++) {
838 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
839 return REREAD_BIB_ERROR;
841 if (i == 0 && q == 0)
842 return REREAD_BIB_GONE;
844 if (i > device->config_rom_length || q != device->config_rom[i])
845 return REREAD_BIB_CHANGED;
848 return REREAD_BIB_UNCHANGED;
851 static void fw_device_refresh(struct work_struct *work)
853 struct fw_device *device =
854 container_of(work, struct fw_device, work.work);
855 struct fw_card *card = device->card;
856 int node_id = device->node_id;
858 switch (reread_bus_info_block(device, device->generation)) {
859 case REREAD_BIB_ERROR:
860 if (device->config_rom_retries < MAX_RETRIES / 2 &&
861 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
862 device->config_rom_retries++;
863 schedule_delayed_work(&device->work, RETRY_DELAY / 2);
869 case REREAD_BIB_GONE:
872 case REREAD_BIB_UNCHANGED:
873 if (atomic_cmpxchg(&device->state,
874 FW_DEVICE_INITIALIZING,
875 FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
878 fw_device_update(work);
879 device->config_rom_retries = 0;
882 case REREAD_BIB_CHANGED:
887 * Something changed. We keep things simple and don't investigate
888 * further. We just destroy all previous units and create new ones.
890 device_for_each_child(&device->device, NULL, shutdown_unit);
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);
903 create_units(device);
905 if (atomic_cmpxchg(&device->state,
906 FW_DEVICE_INITIALIZING,
907 FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
910 fw_notify("refreshed device %s\n", device->device.bus_id);
911 device->config_rom_retries = 0;
915 fw_notify("giving up on refresh of device %s\n", device->device.bus_id);
917 atomic_set(&device->state, FW_DEVICE_SHUTDOWN);
918 fw_device_shutdown(work);
920 if (node_id == card->root_node->node_id)
921 schedule_delayed_work(&card->work, 0);
924 void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
926 struct fw_device *device;
929 case FW_NODE_CREATED:
930 case FW_NODE_LINK_ON:
934 device = kzalloc(sizeof(*device), GFP_ATOMIC);
939 * Do minimal intialization of the device here, the
940 * rest will happen in fw_device_init(). We need the
941 * card and node so we can read the config rom and we
942 * need to do device_initialize() now so
943 * device_for_each_child() in FW_NODE_UPDATED is
946 device_initialize(&device->device);
947 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
948 atomic_inc(&card->device_count);
950 device->node = fw_node_get(node);
951 device->node_id = node->node_id;
952 device->generation = card->generation;
953 INIT_LIST_HEAD(&device->client_list);
956 * Set the node data to point back to this device so
957 * FW_NODE_UPDATED callbacks can update the node_id
958 * and generation for the device.
963 * Many devices are slow to respond after bus resets,
964 * especially if they are bus powered and go through
965 * power-up after getting plugged in. We schedule the
966 * first config rom scan half a second after bus reset.
968 INIT_DELAYED_WORK(&device->work, fw_device_init);
969 schedule_delayed_work(&device->work, INITIAL_DELAY);
972 case FW_NODE_INITIATED_RESET:
977 device->node_id = node->node_id;
978 smp_wmb(); /* update node_id before generation */
979 device->generation = card->generation;
980 if (atomic_cmpxchg(&device->state,
982 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
983 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
984 schedule_delayed_work(&device->work,
985 node == card->local_node ? 0 : INITIAL_DELAY);
989 case FW_NODE_UPDATED:
990 if (!node->link_on || node->data == NULL)
994 device->node_id = node->node_id;
995 smp_wmb(); /* update node_id before generation */
996 device->generation = card->generation;
997 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
998 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
999 schedule_delayed_work(&device->work, 0);
1003 case FW_NODE_DESTROYED:
1004 case FW_NODE_LINK_OFF:
1009 * Destroy the device associated with the node. There
1010 * are two cases here: either the device is fully
1011 * initialized (FW_DEVICE_RUNNING) or we're in the
1012 * process of reading its config rom
1013 * (FW_DEVICE_INITIALIZING). If it is fully
1014 * initialized we can reuse device->work to schedule a
1015 * full fw_device_shutdown(). If not, there's work
1016 * scheduled to read it's config rom, and we just put
1017 * the device in shutdown state to have that code fail
1018 * to create the device.
1020 device = node->data;
1021 if (atomic_xchg(&device->state,
1022 FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
1023 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1024 schedule_delayed_work(&device->work, 0);