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
= (CSR_REGISTER_BASE
| CSR_CONFIG_ROM
) + 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);