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 <linux/rwsem.h>
30 #include <linux/semaphore.h>
31 #include <asm/system.h>
32 #include <linux/ctype.h>
33 #include "fw-transaction.h"
34 #include "fw-topology.h"
35 #include "fw-device.h"
37 void fw_csr_iterator_init(struct fw_csr_iterator
*ci
, u32
* p
)
40 ci
->end
= ci
->p
+ (p
[0] >> 16);
42 EXPORT_SYMBOL(fw_csr_iterator_init
);
44 int fw_csr_iterator_next(struct fw_csr_iterator
*ci
, int *key
, int *value
)
47 *value
= *ci
->p
& 0xffffff;
49 return ci
->p
++ < ci
->end
;
51 EXPORT_SYMBOL(fw_csr_iterator_next
);
53 static int is_fw_unit(struct device
*dev
);
55 static int match_unit_directory(u32
* directory
, const struct fw_device_id
*id
)
57 struct fw_csr_iterator ci
;
58 int key
, value
, match
;
61 fw_csr_iterator_init(&ci
, directory
);
62 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
63 if (key
== CSR_VENDOR
&& value
== id
->vendor
)
64 match
|= FW_MATCH_VENDOR
;
65 if (key
== CSR_MODEL
&& value
== id
->model
)
66 match
|= FW_MATCH_MODEL
;
67 if (key
== CSR_SPECIFIER_ID
&& value
== id
->specifier_id
)
68 match
|= FW_MATCH_SPECIFIER_ID
;
69 if (key
== CSR_VERSION
&& value
== id
->version
)
70 match
|= FW_MATCH_VERSION
;
73 return (match
& id
->match_flags
) == id
->match_flags
;
76 static int fw_unit_match(struct device
*dev
, struct device_driver
*drv
)
78 struct fw_unit
*unit
= fw_unit(dev
);
79 struct fw_driver
*driver
= fw_driver(drv
);
82 /* We only allow binding to fw_units. */
86 for (i
= 0; driver
->id_table
[i
].match_flags
!= 0; i
++) {
87 if (match_unit_directory(unit
->directory
, &driver
->id_table
[i
]))
94 static int get_modalias(struct fw_unit
*unit
, char *buffer
, size_t buffer_size
)
96 struct fw_device
*device
= fw_device(unit
->device
.parent
);
97 struct fw_csr_iterator ci
;
102 int specifier_id
= 0;
105 fw_csr_iterator_init(&ci
, &device
->config_rom
[5]);
106 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
117 fw_csr_iterator_init(&ci
, unit
->directory
);
118 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
120 case CSR_SPECIFIER_ID
:
121 specifier_id
= value
;
129 return snprintf(buffer
, buffer_size
,
130 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
131 vendor
, model
, specifier_id
, version
);
135 fw_unit_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
137 struct fw_unit
*unit
= fw_unit(dev
);
140 get_modalias(unit
, modalias
, sizeof(modalias
));
142 if (add_uevent_var(env
, "MODALIAS=%s", modalias
))
148 struct bus_type fw_bus_type
= {
150 .match
= fw_unit_match
,
152 EXPORT_SYMBOL(fw_bus_type
);
154 static void fw_device_release(struct device
*dev
)
156 struct fw_device
*device
= fw_device(dev
);
157 struct fw_card
*card
= device
->card
;
161 * Take the card lock so we don't set this to NULL while a
162 * FW_NODE_UPDATED callback is being handled or while the
163 * bus manager work looks at this node.
165 spin_lock_irqsave(&card
->lock
, flags
);
166 device
->node
->data
= NULL
;
167 spin_unlock_irqrestore(&card
->lock
, flags
);
169 fw_node_put(device
->node
);
170 kfree(device
->config_rom
);
175 int fw_device_enable_phys_dma(struct fw_device
*device
)
177 int generation
= device
->generation
;
179 /* device->node_id, accessed below, must not be older than generation */
182 return device
->card
->driver
->enable_phys_dma(device
->card
,
186 EXPORT_SYMBOL(fw_device_enable_phys_dma
);
188 struct config_rom_attribute
{
189 struct device_attribute attr
;
194 show_immediate(struct device
*dev
, struct device_attribute
*dattr
, char *buf
)
196 struct config_rom_attribute
*attr
=
197 container_of(dattr
, struct config_rom_attribute
, attr
);
198 struct fw_csr_iterator ci
;
200 int key
, value
, ret
= -ENOENT
;
202 down_read(&fw_device_rwsem
);
205 dir
= fw_unit(dev
)->directory
;
207 dir
= fw_device(dev
)->config_rom
+ 5;
209 fw_csr_iterator_init(&ci
, dir
);
210 while (fw_csr_iterator_next(&ci
, &key
, &value
))
211 if (attr
->key
== key
) {
212 ret
= snprintf(buf
, buf
? PAGE_SIZE
: 0,
217 up_read(&fw_device_rwsem
);
222 #define IMMEDIATE_ATTR(name, key) \
223 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
226 show_text_leaf(struct device
*dev
, struct device_attribute
*dattr
, char *buf
)
228 struct config_rom_attribute
*attr
=
229 container_of(dattr
, struct config_rom_attribute
, attr
);
230 struct fw_csr_iterator ci
;
231 u32
*dir
, *block
= NULL
, *p
, *end
;
232 int length
, key
, value
, last_key
= 0, ret
= -ENOENT
;
235 down_read(&fw_device_rwsem
);
238 dir
= fw_unit(dev
)->directory
;
240 dir
= fw_device(dev
)->config_rom
+ 5;
242 fw_csr_iterator_init(&ci
, dir
);
243 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
244 if (attr
->key
== last_key
&&
245 key
== (CSR_DESCRIPTOR
| CSR_LEAF
))
246 block
= ci
.p
- 1 + value
;
253 length
= min(block
[0] >> 16, 256U);
257 if (block
[1] != 0 || block
[2] != 0)
258 /* Unknown encoding. */
267 end
= &block
[length
+ 1];
268 for (p
= &block
[3]; p
< end
; p
++, b
+= 4)
269 * (u32
*) b
= (__force u32
) __cpu_to_be32(*p
);
271 /* Strip trailing whitespace and add newline. */
272 while (b
--, (isspace(*b
) || *b
== '\0') && b
> buf
);
276 up_read(&fw_device_rwsem
);
281 #define TEXT_LEAF_ATTR(name, key) \
282 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
284 static struct config_rom_attribute config_rom_attributes
[] = {
285 IMMEDIATE_ATTR(vendor
, CSR_VENDOR
),
286 IMMEDIATE_ATTR(hardware_version
, CSR_HARDWARE_VERSION
),
287 IMMEDIATE_ATTR(specifier_id
, CSR_SPECIFIER_ID
),
288 IMMEDIATE_ATTR(version
, CSR_VERSION
),
289 IMMEDIATE_ATTR(model
, CSR_MODEL
),
290 TEXT_LEAF_ATTR(vendor_name
, CSR_VENDOR
),
291 TEXT_LEAF_ATTR(model_name
, CSR_MODEL
),
292 TEXT_LEAF_ATTR(hardware_version_name
, CSR_HARDWARE_VERSION
),
296 init_fw_attribute_group(struct device
*dev
,
297 struct device_attribute
*attrs
,
298 struct fw_attribute_group
*group
)
300 struct device_attribute
*attr
;
303 for (j
= 0; attrs
[j
].attr
.name
!= NULL
; j
++)
304 group
->attrs
[j
] = &attrs
[j
].attr
;
306 for (i
= 0; i
< ARRAY_SIZE(config_rom_attributes
); i
++) {
307 attr
= &config_rom_attributes
[i
].attr
;
308 if (attr
->show(dev
, attr
, NULL
) < 0)
310 group
->attrs
[j
++] = &attr
->attr
;
313 BUG_ON(j
>= ARRAY_SIZE(group
->attrs
));
314 group
->attrs
[j
++] = NULL
;
315 group
->groups
[0] = &group
->group
;
316 group
->groups
[1] = NULL
;
317 group
->group
.attrs
= group
->attrs
;
318 dev
->groups
= group
->groups
;
322 modalias_show(struct device
*dev
,
323 struct device_attribute
*attr
, char *buf
)
325 struct fw_unit
*unit
= fw_unit(dev
);
328 length
= get_modalias(unit
, buf
, PAGE_SIZE
);
329 strcpy(buf
+ length
, "\n");
335 rom_index_show(struct device
*dev
,
336 struct device_attribute
*attr
, char *buf
)
338 struct fw_device
*device
= fw_device(dev
->parent
);
339 struct fw_unit
*unit
= fw_unit(dev
);
341 return snprintf(buf
, PAGE_SIZE
, "%d\n",
342 (int)(unit
->directory
- device
->config_rom
));
345 static struct device_attribute fw_unit_attributes
[] = {
347 __ATTR_RO(rom_index
),
352 config_rom_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
354 struct fw_device
*device
= fw_device(dev
);
357 down_read(&fw_device_rwsem
);
358 length
= device
->config_rom_length
* 4;
359 memcpy(buf
, device
->config_rom
, length
);
360 up_read(&fw_device_rwsem
);
366 guid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
368 struct fw_device
*device
= fw_device(dev
);
371 down_read(&fw_device_rwsem
);
372 ret
= snprintf(buf
, PAGE_SIZE
, "0x%08x%08x\n",
373 device
->config_rom
[3], device
->config_rom
[4]);
374 up_read(&fw_device_rwsem
);
379 static struct device_attribute fw_device_attributes
[] = {
380 __ATTR_RO(config_rom
),
386 read_rom(struct fw_device
*device
, int generation
, int index
, u32
*data
)
390 /* device->node_id, accessed below, must not be older than generation */
393 rcode
= fw_run_transaction(device
->card
, TCODE_READ_QUADLET_REQUEST
,
394 device
->node_id
, generation
, device
->max_speed
,
395 (CSR_REGISTER_BASE
| CSR_CONFIG_ROM
) + index
* 4,
402 #define READ_BIB_ROM_SIZE 256
403 #define READ_BIB_STACK_SIZE 16
406 * Read the bus info block, perform a speed probe, and read all of the rest of
407 * the config ROM. We do all this with a cached bus generation. If the bus
408 * generation changes under us, read_bus_info_block will fail and get retried.
409 * It's better to start all over in this case because the node from which we
410 * are reading the ROM may have changed the ROM during the reset.
412 static int read_bus_info_block(struct fw_device
*device
, int generation
)
414 u32
*rom
, *stack
, *old_rom
, *new_rom
;
416 int i
, end
, length
, ret
= -1;
418 rom
= kmalloc(sizeof(*rom
) * READ_BIB_ROM_SIZE
+
419 sizeof(*stack
) * READ_BIB_STACK_SIZE
, GFP_KERNEL
);
423 stack
= &rom
[READ_BIB_ROM_SIZE
];
425 device
->max_speed
= SCODE_100
;
427 /* First read the bus info block. */
428 for (i
= 0; i
< 5; i
++) {
429 if (read_rom(device
, generation
, i
, &rom
[i
]) != RCODE_COMPLETE
)
432 * As per IEEE1212 7.2, during power-up, devices can
433 * reply with a 0 for the first quadlet of the config
434 * rom to indicate that they are booting (for example,
435 * if the firmware is on the disk of a external
436 * harddisk). In that case we just fail, and the
437 * retry mechanism will try again later.
439 if (i
== 0 && rom
[i
] == 0)
443 device
->max_speed
= device
->node
->max_speed
;
446 * Determine the speed of
447 * - devices with link speed less than PHY speed,
448 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
449 * - all devices if there are 1394b repeaters.
450 * Note, we cannot use the bus info block's link_spd as starting point
451 * because some buggy firmwares set it lower than necessary and because
452 * 1394-1995 nodes do not have the field.
454 if ((rom
[2] & 0x7) < device
->max_speed
||
455 device
->max_speed
== SCODE_BETA
||
456 device
->card
->beta_repeaters_present
) {
459 /* for S1600 and S3200 */
460 if (device
->max_speed
== SCODE_BETA
)
461 device
->max_speed
= device
->card
->link_speed
;
463 while (device
->max_speed
> SCODE_100
) {
464 if (read_rom(device
, generation
, 0, &dummy
) ==
472 * Now parse the config rom. The config rom is a recursive
473 * directory structure so we parse it using a stack of
474 * references to the blocks that make up the structure. We
475 * push a reference to the root directory on the stack to
480 stack
[sp
++] = 0xc0000005;
483 * Pop the next block reference of the stack. The
484 * lower 24 bits is the offset into the config rom,
485 * the upper 8 bits are the type of the reference the
490 if (i
>= READ_BIB_ROM_SIZE
)
492 * The reference points outside the standard
493 * config rom area, something's fishy.
497 /* Read header quadlet for the block to get the length. */
498 if (read_rom(device
, generation
, i
, &rom
[i
]) != RCODE_COMPLETE
)
500 end
= i
+ (rom
[i
] >> 16) + 1;
502 if (end
> READ_BIB_ROM_SIZE
)
504 * This block extends outside standard config
505 * area (and the array we're reading it
506 * into). That's broken, so ignore this
512 * Now read in the block. If this is a directory
513 * block, check the entries as we read them to see if
514 * it references another block, and push it in that case.
517 if (read_rom(device
, generation
, i
, &rom
[i
]) !=
520 if ((key
>> 30) == 3 && (rom
[i
] >> 30) > 1 &&
521 sp
< READ_BIB_STACK_SIZE
)
522 stack
[sp
++] = i
+ rom
[i
];
529 old_rom
= device
->config_rom
;
530 new_rom
= kmemdup(rom
, length
* 4, GFP_KERNEL
);
534 down_write(&fw_device_rwsem
);
535 device
->config_rom
= new_rom
;
536 device
->config_rom_length
= length
;
537 up_write(&fw_device_rwsem
);
541 device
->cmc
= rom
[2] & 1 << 30;
548 static void fw_unit_release(struct device
*dev
)
550 struct fw_unit
*unit
= fw_unit(dev
);
555 static struct device_type fw_unit_type
= {
556 .uevent
= fw_unit_uevent
,
557 .release
= fw_unit_release
,
560 static int is_fw_unit(struct device
*dev
)
562 return dev
->type
== &fw_unit_type
;
565 static void create_units(struct fw_device
*device
)
567 struct fw_csr_iterator ci
;
568 struct fw_unit
*unit
;
572 fw_csr_iterator_init(&ci
, &device
->config_rom
[5]);
573 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
574 if (key
!= (CSR_UNIT
| CSR_DIRECTORY
))
578 * Get the address of the unit directory and try to
579 * match the drivers id_tables against it.
581 unit
= kzalloc(sizeof(*unit
), GFP_KERNEL
);
583 fw_error("failed to allocate memory for unit\n");
587 unit
->directory
= ci
.p
+ value
- 1;
588 unit
->device
.bus
= &fw_bus_type
;
589 unit
->device
.type
= &fw_unit_type
;
590 unit
->device
.parent
= &device
->device
;
591 dev_set_name(&unit
->device
, "%s.%d", dev_name(&device
->device
), i
++);
593 init_fw_attribute_group(&unit
->device
,
595 &unit
->attribute_group
);
596 if (device_register(&unit
->device
) < 0)
606 static int shutdown_unit(struct device
*device
, void *data
)
608 device_unregister(device
);
614 * fw_device_rwsem acts as dual purpose mutex:
615 * - serializes accesses to fw_device_idr,
616 * - serializes accesses to fw_device.config_rom/.config_rom_length and
617 * fw_unit.directory, unless those accesses happen at safe occasions
619 DECLARE_RWSEM(fw_device_rwsem
);
621 DEFINE_IDR(fw_device_idr
);
624 struct fw_device
*fw_device_get_by_devt(dev_t devt
)
626 struct fw_device
*device
;
628 down_read(&fw_device_rwsem
);
629 device
= idr_find(&fw_device_idr
, MINOR(devt
));
631 fw_device_get(device
);
632 up_read(&fw_device_rwsem
);
637 static void fw_device_shutdown(struct work_struct
*work
)
639 struct fw_device
*device
=
640 container_of(work
, struct fw_device
, work
.work
);
641 int minor
= MINOR(device
->device
.devt
);
643 fw_device_cdev_remove(device
);
644 device_for_each_child(&device
->device
, NULL
, shutdown_unit
);
645 device_unregister(&device
->device
);
647 down_write(&fw_device_rwsem
);
648 idr_remove(&fw_device_idr
, minor
);
649 up_write(&fw_device_rwsem
);
650 fw_device_put(device
);
653 static struct device_type fw_device_type
= {
654 .release
= fw_device_release
,
658 * These defines control the retry behavior for reading the config
659 * rom. It shouldn't be necessary to tweak these; if the device
660 * doesn't respond to a config rom read within 10 seconds, it's not
661 * going to respond at all. As for the initial delay, a lot of
662 * devices will be able to respond within half a second after bus
663 * reset. On the other hand, it's not really worth being more
664 * aggressive than that, since it scales pretty well; if 10 devices
665 * are plugged in, they're all getting read within one second.
668 #define MAX_RETRIES 10
669 #define RETRY_DELAY (3 * HZ)
670 #define INITIAL_DELAY (HZ / 2)
672 static void fw_device_init(struct work_struct
*work
)
674 struct fw_device
*device
=
675 container_of(work
, struct fw_device
, work
.work
);
679 * All failure paths here set node->data to NULL, so that we
680 * don't try to do device_for_each_child() on a kfree()'d
684 if (read_bus_info_block(device
, device
->generation
) < 0) {
685 if (device
->config_rom_retries
< MAX_RETRIES
&&
686 atomic_read(&device
->state
) == FW_DEVICE_INITIALIZING
) {
687 device
->config_rom_retries
++;
688 schedule_delayed_work(&device
->work
, RETRY_DELAY
);
690 fw_notify("giving up on config rom for node id %x\n",
692 if (device
->node
== device
->card
->root_node
)
693 fw_schedule_bm_work(device
->card
, 0);
694 fw_device_release(&device
->device
);
699 device_initialize(&device
->device
);
701 fw_device_get(device
);
702 down_write(&fw_device_rwsem
);
703 err
= idr_pre_get(&fw_device_idr
, GFP_KERNEL
) ?
704 idr_get_new(&fw_device_idr
, device
, &minor
) :
706 up_write(&fw_device_rwsem
);
711 device
->device
.bus
= &fw_bus_type
;
712 device
->device
.type
= &fw_device_type
;
713 device
->device
.parent
= device
->card
->device
;
714 device
->device
.devt
= MKDEV(fw_cdev_major
, minor
);
715 dev_set_name(&device
->device
, "fw%d", minor
);
717 init_fw_attribute_group(&device
->device
,
718 fw_device_attributes
,
719 &device
->attribute_group
);
720 if (device_add(&device
->device
)) {
721 fw_error("Failed to add device.\n");
722 goto error_with_cdev
;
725 create_units(device
);
728 * Transition the device to running state. If it got pulled
729 * out from under us while we did the intialization work, we
730 * have to shut down the device again here. Normally, though,
731 * fw_node_event will be responsible for shutting it down when
732 * necessary. We have to use the atomic cmpxchg here to avoid
733 * racing with the FW_NODE_DESTROYED case in
736 if (atomic_cmpxchg(&device
->state
,
737 FW_DEVICE_INITIALIZING
,
738 FW_DEVICE_RUNNING
) == FW_DEVICE_SHUTDOWN
) {
739 fw_device_shutdown(work
);
741 if (device
->config_rom_retries
)
742 fw_notify("created device %s: GUID %08x%08x, S%d00, "
743 "%d config ROM retries\n",
744 dev_name(&device
->device
),
745 device
->config_rom
[3], device
->config_rom
[4],
746 1 << device
->max_speed
,
747 device
->config_rom_retries
);
749 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
750 dev_name(&device
->device
),
751 device
->config_rom
[3], device
->config_rom
[4],
752 1 << device
->max_speed
);
753 device
->config_rom_retries
= 0;
757 * Reschedule the IRM work if we just finished reading the
758 * root node config rom. If this races with a bus reset we
759 * just end up running the IRM work a couple of extra times -
762 if (device
->node
== device
->card
->root_node
)
763 fw_schedule_bm_work(device
->card
, 0);
768 down_write(&fw_device_rwsem
);
769 idr_remove(&fw_device_idr
, minor
);
770 up_write(&fw_device_rwsem
);
772 fw_device_put(device
); /* fw_device_idr's reference */
774 put_device(&device
->device
); /* our reference */
777 static int update_unit(struct device
*dev
, void *data
)
779 struct fw_unit
*unit
= fw_unit(dev
);
780 struct fw_driver
*driver
= (struct fw_driver
*)dev
->driver
;
782 if (is_fw_unit(dev
) && driver
!= NULL
&& driver
->update
!= NULL
) {
784 driver
->update(unit
);
791 static void fw_device_update(struct work_struct
*work
)
793 struct fw_device
*device
=
794 container_of(work
, struct fw_device
, work
.work
);
796 fw_device_cdev_update(device
);
797 device_for_each_child(&device
->device
, NULL
, update_unit
);
803 REREAD_BIB_UNCHANGED
,
807 /* Reread and compare bus info block and header of root directory */
808 static int reread_bus_info_block(struct fw_device
*device
, int generation
)
813 for (i
= 0; i
< 6; i
++) {
814 if (read_rom(device
, generation
, i
, &q
) != RCODE_COMPLETE
)
815 return REREAD_BIB_ERROR
;
817 if (i
== 0 && q
== 0)
818 return REREAD_BIB_GONE
;
820 if (i
> device
->config_rom_length
|| q
!= device
->config_rom
[i
])
821 return REREAD_BIB_CHANGED
;
824 return REREAD_BIB_UNCHANGED
;
827 static void fw_device_refresh(struct work_struct
*work
)
829 struct fw_device
*device
=
830 container_of(work
, struct fw_device
, work
.work
);
831 struct fw_card
*card
= device
->card
;
832 int node_id
= device
->node_id
;
834 switch (reread_bus_info_block(device
, device
->generation
)) {
835 case REREAD_BIB_ERROR
:
836 if (device
->config_rom_retries
< MAX_RETRIES
/ 2 &&
837 atomic_read(&device
->state
) == FW_DEVICE_INITIALIZING
) {
838 device
->config_rom_retries
++;
839 schedule_delayed_work(&device
->work
, RETRY_DELAY
/ 2);
845 case REREAD_BIB_GONE
:
848 case REREAD_BIB_UNCHANGED
:
849 if (atomic_cmpxchg(&device
->state
,
850 FW_DEVICE_INITIALIZING
,
851 FW_DEVICE_RUNNING
) == FW_DEVICE_SHUTDOWN
)
854 fw_device_update(work
);
855 device
->config_rom_retries
= 0;
858 case REREAD_BIB_CHANGED
:
863 * Something changed. We keep things simple and don't investigate
864 * further. We just destroy all previous units and create new ones.
866 device_for_each_child(&device
->device
, NULL
, shutdown_unit
);
868 if (read_bus_info_block(device
, device
->generation
) < 0) {
869 if (device
->config_rom_retries
< MAX_RETRIES
&&
870 atomic_read(&device
->state
) == FW_DEVICE_INITIALIZING
) {
871 device
->config_rom_retries
++;
872 schedule_delayed_work(&device
->work
, RETRY_DELAY
);
879 create_units(device
);
881 if (atomic_cmpxchg(&device
->state
,
882 FW_DEVICE_INITIALIZING
,
883 FW_DEVICE_RUNNING
) == FW_DEVICE_SHUTDOWN
)
886 fw_notify("refreshed device %s\n", dev_name(&device
->device
));
887 device
->config_rom_retries
= 0;
891 fw_notify("giving up on refresh of device %s\n", dev_name(&device
->device
));
893 atomic_set(&device
->state
, FW_DEVICE_SHUTDOWN
);
894 fw_device_shutdown(work
);
896 if (node_id
== card
->root_node
->node_id
)
897 fw_schedule_bm_work(card
, 0);
900 void fw_node_event(struct fw_card
*card
, struct fw_node
*node
, int event
)
902 struct fw_device
*device
;
905 case FW_NODE_CREATED
:
906 case FW_NODE_LINK_ON
:
910 device
= kzalloc(sizeof(*device
), GFP_ATOMIC
);
915 * Do minimal intialization of the device here, the
916 * rest will happen in fw_device_init().
918 * Attention: A lot of things, even fw_device_get(),
919 * cannot be done before fw_device_init() finished!
920 * You can basically just check device->state and
921 * schedule work until then, but only while holding
924 atomic_set(&device
->state
, FW_DEVICE_INITIALIZING
);
925 device
->card
= fw_card_get(card
);
926 device
->node
= fw_node_get(node
);
927 device
->node_id
= node
->node_id
;
928 device
->generation
= card
->generation
;
929 INIT_LIST_HEAD(&device
->client_list
);
932 * Set the node data to point back to this device so
933 * FW_NODE_UPDATED callbacks can update the node_id
934 * and generation for the device.
939 * Many devices are slow to respond after bus resets,
940 * especially if they are bus powered and go through
941 * power-up after getting plugged in. We schedule the
942 * first config rom scan half a second after bus reset.
944 INIT_DELAYED_WORK(&device
->work
, fw_device_init
);
945 schedule_delayed_work(&device
->work
, INITIAL_DELAY
);
948 case FW_NODE_INITIATED_RESET
:
953 device
->node_id
= node
->node_id
;
954 smp_wmb(); /* update node_id before generation */
955 device
->generation
= card
->generation
;
956 if (atomic_cmpxchg(&device
->state
,
958 FW_DEVICE_INITIALIZING
) == FW_DEVICE_RUNNING
) {
959 PREPARE_DELAYED_WORK(&device
->work
, fw_device_refresh
);
960 schedule_delayed_work(&device
->work
,
961 node
== card
->local_node
? 0 : INITIAL_DELAY
);
965 case FW_NODE_UPDATED
:
966 if (!node
->link_on
|| node
->data
== NULL
)
970 device
->node_id
= node
->node_id
;
971 smp_wmb(); /* update node_id before generation */
972 device
->generation
= card
->generation
;
973 if (atomic_read(&device
->state
) == FW_DEVICE_RUNNING
) {
974 PREPARE_DELAYED_WORK(&device
->work
, fw_device_update
);
975 schedule_delayed_work(&device
->work
, 0);
979 case FW_NODE_DESTROYED
:
980 case FW_NODE_LINK_OFF
:
985 * Destroy the device associated with the node. There
986 * are two cases here: either the device is fully
987 * initialized (FW_DEVICE_RUNNING) or we're in the
988 * process of reading its config rom
989 * (FW_DEVICE_INITIALIZING). If it is fully
990 * initialized we can reuse device->work to schedule a
991 * full fw_device_shutdown(). If not, there's work
992 * scheduled to read it's config rom, and we just put
993 * the device in shutdown state to have that code fail
994 * to create the device.
997 if (atomic_xchg(&device
->state
,
998 FW_DEVICE_SHUTDOWN
) == FW_DEVICE_RUNNING
) {
999 PREPARE_DELAYED_WORK(&device
->work
, fw_device_shutdown
);
1000 schedule_delayed_work(&device
->work
, 0);