Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / ieee1394 / nodemgr.c
1 /*
2  * Node information (ConfigROM) collection and management.
3  *
4  * Copyright (C) 2000           Andreas E. Bombe
5  *               2001-2003      Ben Collins <bcollins@debian.net>
6  *
7  * This code is licensed under the GPL.  See the file COPYING in the root
8  * directory of the kernel sources for details.
9  */
10
11 #include <linux/bitmap.h>
12 #include <linux/kernel.h>
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/kthread.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/freezer.h>
20 #include <asm/atomic.h>
21
22 #include "csr.h"
23 #include "highlevel.h"
24 #include "hosts.h"
25 #include "ieee1394.h"
26 #include "ieee1394_core.h"
27 #include "ieee1394_hotplug.h"
28 #include "ieee1394_types.h"
29 #include "ieee1394_transactions.h"
30 #include "nodemgr.h"
31
32 static int ignore_drivers;
33 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
34 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
35
36 struct nodemgr_csr_info {
37         struct hpsb_host *host;
38         nodeid_t nodeid;
39         unsigned int generation;
40         unsigned int speed_unverified:1;
41 };
42
43
44 /*
45  * Correct the speed map entry.  This is necessary
46  *  - for nodes with link speed < phy speed,
47  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
48  * A possible speed is determined by trial and error, using quadlet reads.
49  */
50 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
51                                quadlet_t *buffer)
52 {
53         quadlet_t q;
54         u8 i, *speed, old_speed, good_speed;
55         int error;
56
57         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
58         old_speed = *speed;
59         good_speed = IEEE1394_SPEED_MAX + 1;
60
61         /* Try every speed from S100 to old_speed.
62          * If we did it the other way around, a too low speed could be caught
63          * if the retry succeeded for some other reason, e.g. because the link
64          * just finished its initialization. */
65         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
66                 *speed = i;
67                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
68                                   &q, sizeof(quadlet_t));
69                 if (error)
70                         break;
71                 *buffer = q;
72                 good_speed = i;
73         }
74         if (good_speed <= IEEE1394_SPEED_MAX) {
75                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
76                            NODE_BUS_ARGS(ci->host, ci->nodeid),
77                            hpsb_speedto_str[good_speed]);
78                 *speed = good_speed;
79                 ci->speed_unverified = 0;
80                 return 0;
81         }
82         *speed = old_speed;
83         return error;
84 }
85
86 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
87                             void *buffer, void *__ci)
88 {
89         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
90         int i, error;
91
92         for (i = 1; ; i++) {
93                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
94                                   buffer, length);
95                 if (!error) {
96                         ci->speed_unverified = 0;
97                         break;
98                 }
99                 /* Give up after 3rd failure. */
100                 if (i == 3)
101                         break;
102
103                 /* The ieee1394_core guessed the node's speed capability from
104                  * the self ID.  Check whether a lower speed works. */
105                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
106                         error = nodemgr_check_speed(ci, addr, buffer);
107                         if (!error)
108                                 break;
109                 }
110                 if (msleep_interruptible(334))
111                         return -EINTR;
112         }
113         return error;
114 }
115
116 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
117 {
118         return (CSR1212_BE32_TO_CPU(bus_info_data[2]) >> 8) & 0x3;
119 }
120
121 static struct csr1212_bus_ops nodemgr_csr_ops = {
122         .bus_read =     nodemgr_bus_read,
123         .get_max_rom =  nodemgr_get_max_rom
124 };
125
126
127 /*
128  * Basically what we do here is start off retrieving the bus_info block.
129  * From there will fill in some info about the node, verify it is of IEEE
130  * 1394 type, and that the crc checks out ok. After that we start off with
131  * the root directory, and subdirectories. To do this, we retrieve the
132  * quadlet header for a directory, find out the length, and retrieve the
133  * complete directory entry (be it a leaf or a directory). We then process
134  * it and add the info to our structure for that particular node.
135  *
136  * We verify CRC's along the way for each directory/block/leaf. The entire
137  * node structure is generic, and simply stores the information in a way
138  * that's easy to parse by the protocol interface.
139  */
140
141 /*
142  * The nodemgr relies heavily on the Driver Model for device callbacks and
143  * driver/device mappings. The old nodemgr used to handle all this itself,
144  * but now we are much simpler because of the LDM.
145  */
146
147 static DEFINE_MUTEX(nodemgr_serialize);
148
149 struct host_info {
150         struct hpsb_host *host;
151         struct list_head list;
152         struct task_struct *thread;
153 };
154
155 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
156 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
157                           char *buffer, int buffer_size);
158 static void nodemgr_resume_ne(struct node_entry *ne);
159 static void nodemgr_remove_ne(struct node_entry *ne);
160 static struct node_entry *find_entry_by_guid(u64 guid);
161
162 struct bus_type ieee1394_bus_type = {
163         .name           = "ieee1394",
164         .match          = nodemgr_bus_match,
165 };
166
167 static void host_cls_release(struct class_device *class_dev)
168 {
169         put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
170 }
171
172 struct class hpsb_host_class = {
173         .name           = "ieee1394_host",
174         .release        = host_cls_release,
175 };
176
177 static void ne_cls_release(struct class_device *class_dev)
178 {
179         put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
180 }
181
182 static struct class nodemgr_ne_class = {
183         .name           = "ieee1394_node",
184         .release        = ne_cls_release,
185 };
186
187 static void ud_cls_release(struct class_device *class_dev)
188 {
189         put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
190 }
191
192 /* The name here is only so that unit directory hotplug works with old
193  * style hotplug, which only ever did unit directories anyway. */
194 static struct class nodemgr_ud_class = {
195         .name           = "ieee1394",
196         .release        = ud_cls_release,
197         .uevent         = nodemgr_uevent,
198 };
199
200 static struct hpsb_highlevel nodemgr_highlevel;
201
202
203 static void nodemgr_release_ud(struct device *dev)
204 {
205         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
206
207         if (ud->vendor_name_kv)
208                 csr1212_release_keyval(ud->vendor_name_kv);
209         if (ud->model_name_kv)
210                 csr1212_release_keyval(ud->model_name_kv);
211
212         kfree(ud);
213 }
214
215 static void nodemgr_release_ne(struct device *dev)
216 {
217         struct node_entry *ne = container_of(dev, struct node_entry, device);
218
219         if (ne->vendor_name_kv)
220                 csr1212_release_keyval(ne->vendor_name_kv);
221
222         kfree(ne);
223 }
224
225
226 static void nodemgr_release_host(struct device *dev)
227 {
228         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
229
230         csr1212_destroy_csr(host->csr.rom);
231
232         kfree(host);
233 }
234
235 static int nodemgr_ud_platform_data;
236
237 static struct device nodemgr_dev_template_ud = {
238         .bus            = &ieee1394_bus_type,
239         .release        = nodemgr_release_ud,
240         .platform_data  = &nodemgr_ud_platform_data,
241 };
242
243 static struct device nodemgr_dev_template_ne = {
244         .bus            = &ieee1394_bus_type,
245         .release        = nodemgr_release_ne,
246 };
247
248 /* This dummy driver prevents the host devices from being scanned. We have no
249  * useful drivers for them yet, and there would be a deadlock possible if the
250  * driver core scans the host device while the host's low-level driver (i.e.
251  * the host's parent device) is being removed. */
252 static struct device_driver nodemgr_mid_layer_driver = {
253         .bus            = &ieee1394_bus_type,
254         .name           = "nodemgr",
255         .owner          = THIS_MODULE,
256 };
257
258 struct device nodemgr_dev_template_host = {
259         .bus            = &ieee1394_bus_type,
260         .release        = nodemgr_release_host,
261 };
262
263
264 #define fw_attr(class, class_type, field, type, format_string)          \
265 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
266 {                                                                       \
267         class_type *class;                                              \
268         class = container_of(dev, class_type, device);                  \
269         return sprintf(buf, format_string, (type)class->field);         \
270 }                                                                       \
271 static struct device_attribute dev_attr_##class##_##field = {           \
272         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
273         .show   = fw_show_##class##_##field,                            \
274 };
275
276 #define fw_attr_td(class, class_type, td_kv)                            \
277 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
278 {                                                                       \
279         int len;                                                        \
280         class_type *class = container_of(dev, class_type, device);      \
281         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
282         memcpy(buf,                                                     \
283                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
284                len);                                                    \
285         while ((buf + len - 1) == '\0')                                 \
286                 len--;                                                  \
287         buf[len++] = '\n';                                              \
288         buf[len] = '\0';                                                \
289         return len;                                                     \
290 }                                                                       \
291 static struct device_attribute dev_attr_##class##_##td_kv = {           \
292         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
293         .show   = fw_show_##class##_##td_kv,                            \
294 };
295
296
297 #define fw_drv_attr(field, type, format_string)                 \
298 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
299 {                                                               \
300         struct hpsb_protocol_driver *driver;                    \
301         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
302         return sprintf(buf, format_string, (type)driver->field);\
303 }                                                               \
304 static struct driver_attribute driver_attr_drv_##field = {      \
305         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
306         .show   = fw_drv_show_##field,                          \
307 };
308
309
310 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
311 {
312         struct node_entry *ne = container_of(dev, struct node_entry, device);
313
314         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
315                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
316                        ne->busopt.irmc,
317                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
318                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
319                        ne->busopt.max_rec,
320                        ne->busopt.max_rom,
321                        ne->busopt.cyc_clk_acc);
322 }
323 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
324
325
326 #ifdef HPSB_DEBUG_TLABELS
327 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
328                                        struct device_attribute *attr, char *buf)
329 {
330         struct node_entry *ne = container_of(dev, struct node_entry, device);
331         unsigned long flags;
332         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
333         int tf;
334
335         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
336         tf = 64 - bitmap_weight(tp, 64);
337         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
338
339         return sprintf(buf, "%d\n", tf);
340 }
341 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
342
343
344 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
345                                        struct device_attribute *attr, char *buf)
346 {
347         struct node_entry *ne = container_of(dev, struct node_entry, device);
348         unsigned long flags;
349         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
350         u64 tm;
351
352         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
353 #if (BITS_PER_LONG <= 32)
354         tm = ((u64)tp[0] << 32) + tp[1];
355 #else
356         tm = tp[0];
357 #endif
358         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
359
360         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
361 }
362 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
363 #endif /* HPSB_DEBUG_TLABELS */
364
365
366 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
367 {
368         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
369         int state = simple_strtoul(buf, NULL, 10);
370
371         if (state == 1) {
372                 ud->ignore_driver = 1;
373                 down_write(&ieee1394_bus_type.subsys.rwsem);
374                 device_release_driver(dev);
375                 up_write(&ieee1394_bus_type.subsys.rwsem);
376         } else if (state == 0)
377                 ud->ignore_driver = 0;
378
379         return count;
380 }
381 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
382 {
383         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
384
385         return sprintf(buf, "%d\n", ud->ignore_driver);
386 }
387 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
388
389
390 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
391 {
392         struct node_entry *ne;
393         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
394
395         ne = find_entry_by_guid(guid);
396
397         if (ne == NULL || !ne->in_limbo)
398                 return -EINVAL;
399
400         nodemgr_remove_ne(ne);
401
402         return count;
403 }
404 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
405 {
406         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
407 }
408 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
409
410
411 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
412                              size_t count)
413 {
414         int error = 0;
415
416         if (simple_strtoul(buf, NULL, 10) == 1)
417                 error = bus_rescan_devices(&ieee1394_bus_type);
418         return error ? error : count;
419 }
420 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
421 {
422         return sprintf(buf, "You can force a rescan of the bus for "
423                         "drivers by writing a 1 to this file\n");
424 }
425 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
426
427
428 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
429 {
430         int state = simple_strtoul(buf, NULL, 10);
431
432         if (state == 1)
433                 ignore_drivers = 1;
434         else if (state == 0)
435                 ignore_drivers = 0;
436
437         return count;
438 }
439 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
440 {
441         return sprintf(buf, "%d\n", ignore_drivers);
442 }
443 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
444
445
446 struct bus_attribute *const fw_bus_attrs[] = {
447         &bus_attr_destroy_node,
448         &bus_attr_rescan,
449         &bus_attr_ignore_drivers,
450         NULL
451 };
452
453
454 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
455 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
456
457 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
458 fw_attr_td(ne, struct node_entry, vendor_name_kv)
459
460 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
461 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
462 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
463
464 static struct device_attribute *const fw_ne_attrs[] = {
465         &dev_attr_ne_guid,
466         &dev_attr_ne_guid_vendor_id,
467         &dev_attr_ne_capabilities,
468         &dev_attr_ne_vendor_id,
469         &dev_attr_ne_nodeid,
470         &dev_attr_bus_options,
471 #ifdef HPSB_DEBUG_TLABELS
472         &dev_attr_tlabels_free,
473         &dev_attr_tlabels_mask,
474 #endif
475 };
476
477
478
479 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
480 fw_attr(ud, struct unit_directory, length, int, "%d\n")
481 /* These are all dependent on the value being provided */
482 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
483 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
484 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
485 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
486 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
487 fw_attr_td(ud, struct unit_directory, model_name_kv)
488
489 static struct device_attribute *const fw_ud_attrs[] = {
490         &dev_attr_ud_address,
491         &dev_attr_ud_length,
492         &dev_attr_ignore_driver,
493 };
494
495
496 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
497 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
498 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
499 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
500 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
501 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
502 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
503 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
504
505 static struct device_attribute *const fw_host_attrs[] = {
506         &dev_attr_host_node_count,
507         &dev_attr_host_selfid_count,
508         &dev_attr_host_nodes_active,
509         &dev_attr_host_in_bus_reset,
510         &dev_attr_host_is_root,
511         &dev_attr_host_is_cycmst,
512         &dev_attr_host_is_irm,
513         &dev_attr_host_is_busmgr,
514 };
515
516
517 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
518 {
519         struct hpsb_protocol_driver *driver;
520         struct ieee1394_device_id *id;
521         int length = 0;
522         char *scratch = buf;
523
524         driver = container_of(drv, struct hpsb_protocol_driver, driver);
525
526         for (id = driver->id_table; id->match_flags != 0; id++) {
527                 int need_coma = 0;
528
529                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
530                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
531                         scratch = buf + length;
532                         need_coma++;
533                 }
534
535                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
536                         length += sprintf(scratch, "%smodel_id=0x%06x",
537                                           need_coma++ ? "," : "",
538                                           id->model_id);
539                         scratch = buf + length;
540                 }
541
542                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
543                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
544                                           need_coma++ ? "," : "",
545                                           id->specifier_id);
546                         scratch = buf + length;
547                 }
548
549                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
550                         length += sprintf(scratch, "%sversion=0x%06x",
551                                           need_coma++ ? "," : "",
552                                           id->version);
553                         scratch = buf + length;
554                 }
555
556                 if (need_coma) {
557                         *scratch++ = '\n';
558                         length++;
559                 }
560         }
561
562         return length;
563 }
564 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
565
566
567 fw_drv_attr(name, const char *, "%s\n")
568
569 static struct driver_attribute *const fw_drv_attrs[] = {
570         &driver_attr_drv_name,
571         &driver_attr_device_ids,
572 };
573
574
575 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
576 {
577         struct device_driver *drv = &driver->driver;
578         int i;
579
580         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
581                 if (driver_create_file(drv, fw_drv_attrs[i]))
582                         goto fail;
583         return;
584 fail:
585         HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
586 }
587
588
589 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
590 {
591         struct device_driver *drv = &driver->driver;
592         int i;
593
594         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
595                 driver_remove_file(drv, fw_drv_attrs[i]);
596 }
597
598
599 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
600 {
601         struct device *dev = &ne->device;
602         int i;
603
604         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
605                 if (device_create_file(dev, fw_ne_attrs[i]))
606                         goto fail;
607         return;
608 fail:
609         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
610                  (unsigned long long)ne->guid);
611 }
612
613
614 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
615 {
616         struct device *dev = &host->device;
617         int i;
618
619         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
620                 if (device_create_file(dev, fw_host_attrs[i]))
621                         goto fail;
622         return;
623 fail:
624         HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
625 }
626
627
628 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
629                                                nodeid_t nodeid);
630
631 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
632 {
633         struct device *dev = &host->device;
634         struct node_entry *ne;
635
636         sysfs_remove_link(&dev->kobj, "irm_id");
637         sysfs_remove_link(&dev->kobj, "busmgr_id");
638         sysfs_remove_link(&dev->kobj, "host_id");
639
640         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
641             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
642                 goto fail;
643         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
644             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
645                 goto fail;
646         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
647             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
648                 goto fail;
649         return;
650 fail:
651         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
652 }
653
654 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
655 {
656         struct device *dev = &ud->device;
657         int i;
658
659         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
660                 if (device_create_file(dev, fw_ud_attrs[i]))
661                         goto fail;
662         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
663                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
664                         goto fail;
665         if (ud->flags & UNIT_DIRECTORY_VERSION)
666                 if (device_create_file(dev, &dev_attr_ud_version))
667                         goto fail;
668         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
669                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
670                         goto fail;
671                 if (ud->vendor_name_kv &&
672                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
673                         goto fail;
674         }
675         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
676                 if (device_create_file(dev, &dev_attr_ud_model_id))
677                         goto fail;
678                 if (ud->model_name_kv &&
679                     device_create_file(dev, &dev_attr_ud_model_name_kv))
680                         goto fail;
681         }
682         return;
683 fail:
684         HPSB_ERR("Failed to add sysfs attributes for unit %s",
685                  ud->device.bus_id);
686 }
687
688
689 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
690 {
691         struct hpsb_protocol_driver *driver;
692         struct unit_directory *ud;
693         struct ieee1394_device_id *id;
694
695         /* We only match unit directories */
696         if (dev->platform_data != &nodemgr_ud_platform_data)
697                 return 0;
698
699         ud = container_of(dev, struct unit_directory, device);
700         if (ud->ne->in_limbo || ud->ignore_driver)
701                 return 0;
702
703         /* We only match drivers of type hpsb_protocol_driver */
704         if (drv == &nodemgr_mid_layer_driver)
705                 return 0;
706
707         driver = container_of(drv, struct hpsb_protocol_driver, driver);
708         for (id = driver->id_table; id->match_flags != 0; id++) {
709                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
710                     id->vendor_id != ud->vendor_id)
711                         continue;
712
713                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
714                     id->model_id != ud->model_id)
715                         continue;
716
717                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
718                     id->specifier_id != ud->specifier_id)
719                         continue;
720
721                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
722                     id->version != ud->version)
723                         continue;
724
725                 return 1;
726         }
727
728         return 0;
729 }
730
731
732 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
733
734 static void nodemgr_remove_uds(struct node_entry *ne)
735 {
736         struct class_device *cdev;
737         struct unit_directory *tmp, *ud;
738
739         /* Iteration over nodemgr_ud_class.children has to be protected by
740          * nodemgr_ud_class.sem, but class_device_unregister() will eventually
741          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
742          * release the semaphore, and then unregister the ud. Since this code
743          * may be called from other contexts besides the knodemgrds, protect the
744          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
745          */
746         mutex_lock(&nodemgr_serialize_remove_uds);
747         for (;;) {
748                 ud = NULL;
749                 down(&nodemgr_ud_class.sem);
750                 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
751                         tmp = container_of(cdev, struct unit_directory,
752                                            class_dev);
753                         if (tmp->ne == ne) {
754                                 ud = tmp;
755                                 break;
756                         }
757                 }
758                 up(&nodemgr_ud_class.sem);
759                 if (ud == NULL)
760                         break;
761                 class_device_unregister(&ud->class_dev);
762                 device_unregister(&ud->device);
763         }
764         mutex_unlock(&nodemgr_serialize_remove_uds);
765 }
766
767
768 static void nodemgr_remove_ne(struct node_entry *ne)
769 {
770         struct device *dev;
771
772         dev = get_device(&ne->device);
773         if (!dev)
774                 return;
775
776         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
777                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
778
779         nodemgr_remove_uds(ne);
780
781         class_device_unregister(&ne->class_dev);
782         device_unregister(dev);
783
784         put_device(dev);
785 }
786
787 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
788 {
789         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
790         return 0;
791 }
792
793 static void nodemgr_remove_host_dev(struct device *dev)
794 {
795         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
796         sysfs_remove_link(&dev->kobj, "irm_id");
797         sysfs_remove_link(&dev->kobj, "busmgr_id");
798         sysfs_remove_link(&dev->kobj, "host_id");
799 }
800
801
802 static void nodemgr_update_bus_options(struct node_entry *ne)
803 {
804 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
805         static const u16 mr[] = { 4, 64, 1024, 0};
806 #endif
807         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
808
809         ne->busopt.irmc         = (busoptions >> 31) & 1;
810         ne->busopt.cmc          = (busoptions >> 30) & 1;
811         ne->busopt.isc          = (busoptions >> 29) & 1;
812         ne->busopt.bmc          = (busoptions >> 28) & 1;
813         ne->busopt.pmc          = (busoptions >> 27) & 1;
814         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
815         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
816         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
817         ne->busopt.generation   = (busoptions >> 4) & 0xf;
818         ne->busopt.lnkspd       = busoptions & 0x7;
819
820         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
821                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
822                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
823                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
824                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
825                      mr[ne->busopt.max_rom],
826                      ne->busopt.generation, ne->busopt.lnkspd);
827 }
828
829
830 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
831                                               struct host_info *hi, nodeid_t nodeid,
832                                               unsigned int generation)
833 {
834         struct hpsb_host *host = hi->host;
835         struct node_entry *ne;
836
837         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
838         if (!ne)
839                 goto fail_alloc;
840
841         ne->host = host;
842         ne->nodeid = nodeid;
843         ne->generation = generation;
844         ne->needs_probe = 1;
845
846         ne->guid = guid;
847         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
848         ne->csr = csr;
849
850         memcpy(&ne->device, &nodemgr_dev_template_ne,
851                sizeof(ne->device));
852         ne->device.parent = &host->device;
853         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
854                  (unsigned long long)(ne->guid));
855
856         ne->class_dev.dev = &ne->device;
857         ne->class_dev.class = &nodemgr_ne_class;
858         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
859                  (unsigned long long)(ne->guid));
860
861         if (device_register(&ne->device))
862                 goto fail_devreg;
863         if (class_device_register(&ne->class_dev))
864                 goto fail_classdevreg;
865         get_device(&ne->device);
866
867         nodemgr_create_ne_dev_files(ne);
868
869         nodemgr_update_bus_options(ne);
870
871         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
872                    (host->node_id == nodeid) ? "Host" : "Node",
873                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
874
875         return ne;
876
877 fail_classdevreg:
878         device_unregister(&ne->device);
879 fail_devreg:
880         kfree(ne);
881 fail_alloc:
882         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
883                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
884
885         return NULL;
886 }
887
888
889 static struct node_entry *find_entry_by_guid(u64 guid)
890 {
891         struct class_device *cdev;
892         struct node_entry *ne, *ret_ne = NULL;
893
894         down(&nodemgr_ne_class.sem);
895         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
896                 ne = container_of(cdev, struct node_entry, class_dev);
897
898                 if (ne->guid == guid) {
899                         ret_ne = ne;
900                         break;
901                 }
902         }
903         up(&nodemgr_ne_class.sem);
904
905         return ret_ne;
906 }
907
908
909 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
910                                                nodeid_t nodeid)
911 {
912         struct class_device *cdev;
913         struct node_entry *ne, *ret_ne = NULL;
914
915         down(&nodemgr_ne_class.sem);
916         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
917                 ne = container_of(cdev, struct node_entry, class_dev);
918
919                 if (ne->host == host && ne->nodeid == nodeid) {
920                         ret_ne = ne;
921                         break;
922                 }
923         }
924         up(&nodemgr_ne_class.sem);
925
926         return ret_ne;
927 }
928
929
930 static void nodemgr_register_device(struct node_entry *ne, 
931         struct unit_directory *ud, struct device *parent)
932 {
933         memcpy(&ud->device, &nodemgr_dev_template_ud,
934                sizeof(ud->device));
935
936         ud->device.parent = parent;
937
938         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
939                  ne->device.bus_id, ud->id);
940
941         ud->class_dev.dev = &ud->device;
942         ud->class_dev.class = &nodemgr_ud_class;
943         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
944                  ne->device.bus_id, ud->id);
945
946         if (device_register(&ud->device))
947                 goto fail_devreg;
948         if (class_device_register(&ud->class_dev))
949                 goto fail_classdevreg;
950         get_device(&ud->device);
951
952         nodemgr_create_ud_dev_files(ud);
953
954         return;
955
956 fail_classdevreg:
957         device_unregister(&ud->device);
958 fail_devreg:
959         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
960 }       
961
962
963 /* This implementation currently only scans the config rom and its
964  * immediate unit directories looking for software_id and
965  * software_version entries, in order to get driver autoloading working. */
966 static struct unit_directory *nodemgr_process_unit_directory
967         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
968          unsigned int *id, struct unit_directory *parent)
969 {
970         struct unit_directory *ud;
971         struct unit_directory *ud_child = NULL;
972         struct csr1212_dentry *dentry;
973         struct csr1212_keyval *kv;
974         u8 last_key_id = 0;
975
976         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
977         if (!ud)
978                 goto unit_directory_error;
979
980         ud->ne = ne;
981         ud->ignore_driver = ignore_drivers;
982         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
983         ud->ud_kv = ud_kv;
984         ud->id = (*id)++;
985
986         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
987                 switch (kv->key.id) {
988                 case CSR1212_KV_ID_VENDOR:
989                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
990                                 ud->vendor_id = kv->value.immediate;
991                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
992                         }
993                         break;
994
995                 case CSR1212_KV_ID_MODEL:
996                         ud->model_id = kv->value.immediate;
997                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
998                         break;
999
1000                 case CSR1212_KV_ID_SPECIFIER_ID:
1001                         ud->specifier_id = kv->value.immediate;
1002                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1003                         break;
1004
1005                 case CSR1212_KV_ID_VERSION:
1006                         ud->version = kv->value.immediate;
1007                         ud->flags |= UNIT_DIRECTORY_VERSION;
1008                         break;
1009
1010                 case CSR1212_KV_ID_DESCRIPTOR:
1011                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1012                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1013                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1015                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1016                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1017                                 switch (last_key_id) {
1018                                 case CSR1212_KV_ID_VENDOR:
1019                                         ud->vendor_name_kv = kv;
1020                                         csr1212_keep_keyval(kv);
1021                                         break;
1022
1023                                 case CSR1212_KV_ID_MODEL:
1024                                         ud->model_name_kv = kv;
1025                                         csr1212_keep_keyval(kv);
1026                                         break;
1027
1028                                 }
1029                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1030                         break;
1031
1032                 case CSR1212_KV_ID_DEPENDENT_INFO:
1033                         /* Logical Unit Number */
1034                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1035                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1036                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1037                                         if (!ud_child)
1038                                                 goto unit_directory_error;
1039                                         nodemgr_register_device(ne, ud_child, &ne->device);
1040                                         ud_child = NULL;
1041                                         
1042                                         ud->id = (*id)++;
1043                                 }
1044                                 ud->lun = kv->value.immediate;
1045                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1046
1047                         /* Logical Unit Directory */
1048                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1049                                 /* This should really be done in SBP2 as this is
1050                                  * doing SBP2 specific parsing.
1051                                  */
1052                                 
1053                                 /* first register the parent unit */
1054                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1055                                 if (ud->device.bus != &ieee1394_bus_type)
1056                                         nodemgr_register_device(ne, ud, &ne->device);
1057                                 
1058                                 /* process the child unit */
1059                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1060
1061                                 if (ud_child == NULL)
1062                                         break;
1063                                 
1064                                 /* inherit unspecified values, the driver core picks it up */
1065                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1066                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1067                                 {
1068                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1069                                         ud_child->model_id = ud->model_id;
1070                                 }
1071                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1072                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1073                                 {
1074                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1075                                         ud_child->specifier_id = ud->specifier_id;
1076                                 }
1077                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1078                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1079                                 {
1080                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1081                                         ud_child->version = ud->version;
1082                                 }
1083                                 
1084                                 /* register the child unit */
1085                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1086                                 nodemgr_register_device(ne, ud_child, &ud->device);
1087                         }
1088
1089                         break;
1090
1091                 default:
1092                         break;
1093                 }
1094                 last_key_id = kv->key.id;
1095         }
1096         
1097         /* do not process child units here and only if not already registered */
1098         if (!parent && ud->device.bus != &ieee1394_bus_type)
1099                 nodemgr_register_device(ne, ud, &ne->device);
1100
1101         return ud;
1102
1103 unit_directory_error:
1104         kfree(ud);
1105         return NULL;
1106 }
1107
1108
1109 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1110 {
1111         unsigned int ud_id = 0;
1112         struct csr1212_dentry *dentry;
1113         struct csr1212_keyval *kv;
1114         u8 last_key_id = 0;
1115
1116         ne->needs_probe = 0;
1117
1118         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1119                 switch (kv->key.id) {
1120                 case CSR1212_KV_ID_VENDOR:
1121                         ne->vendor_id = kv->value.immediate;
1122                         break;
1123
1124                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1125                         ne->capabilities = kv->value.immediate;
1126                         break;
1127
1128                 case CSR1212_KV_ID_UNIT:
1129                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1130                         break;
1131
1132                 case CSR1212_KV_ID_DESCRIPTOR:
1133                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1134                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1135                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1136                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1137                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1138                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1139                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1140                                         ne->vendor_name_kv = kv;
1141                                         csr1212_keep_keyval(kv);
1142                                 }
1143                         }
1144                         break;
1145                 }
1146                 last_key_id = kv->key.id;
1147         }
1148
1149         if (ne->vendor_name_kv &&
1150             device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1151                 goto fail;
1152         return;
1153 fail:
1154         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1155                  (unsigned long long)ne->guid);
1156 }
1157
1158 #ifdef CONFIG_HOTPLUG
1159
1160 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1161                           char *buffer, int buffer_size)
1162 {
1163         struct unit_directory *ud;
1164         int i = 0;
1165         int length = 0;
1166         /* ieee1394:venNmoNspNverN */
1167         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1168
1169         if (!cdev)
1170                 return -ENODEV;
1171
1172         ud = container_of(cdev, struct unit_directory, class_dev);
1173
1174         if (ud->ne->in_limbo || ud->ignore_driver)
1175                 return -ENODEV;
1176
1177 #define PUT_ENVP(fmt,val)                                       \
1178 do {                                                            \
1179         int printed;                                            \
1180         envp[i++] = buffer;                                     \
1181         printed = snprintf(buffer, buffer_size - length,        \
1182                            fmt, val);                           \
1183         if ((buffer_size - (length+printed) <= 0) || (i >= num_envp))   \
1184                 return -ENOMEM;                                 \
1185         length += printed+1;                                    \
1186         buffer += printed+1;                                    \
1187 } while (0)
1188
1189         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1190         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1191         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1192         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1193         PUT_ENVP("VERSION=%06x", ud->version);
1194         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1195                         ud->vendor_id,
1196                         ud->model_id,
1197                         ud->specifier_id,
1198                         ud->version);
1199         PUT_ENVP("MODALIAS=%s", buf);
1200
1201 #undef PUT_ENVP
1202
1203         envp[i] = NULL;
1204
1205         return 0;
1206 }
1207
1208 #else
1209
1210 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1211                           char *buffer, int buffer_size)
1212 {
1213         return -ENODEV;
1214 }
1215
1216 #endif /* CONFIG_HOTPLUG */
1217
1218
1219 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1220                              struct module *owner)
1221 {
1222         int error;
1223
1224         drv->driver.bus = &ieee1394_bus_type;
1225         drv->driver.owner = owner;
1226         drv->driver.name = drv->name;
1227
1228         /* This will cause a probe for devices */
1229         error = driver_register(&drv->driver);
1230         if (!error)
1231                 nodemgr_create_drv_files(drv);
1232         return error;
1233 }
1234
1235 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1236 {
1237         nodemgr_remove_drv_files(driver);
1238         /* This will subsequently disconnect all devices that our driver
1239          * is attached to. */
1240         driver_unregister(&driver->driver);
1241 }
1242
1243
1244 /*
1245  * This function updates nodes that were present on the bus before the
1246  * reset and still are after the reset.  The nodeid and the config rom
1247  * may have changed, and the drivers managing this device must be
1248  * informed that this device just went through a bus reset, to allow
1249  * the to take whatever actions required.
1250  */
1251 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1252                                 struct host_info *hi, nodeid_t nodeid,
1253                                 unsigned int generation)
1254 {
1255         if (ne->nodeid != nodeid) {
1256                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1257                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1258                            NODE_BUS_ARGS(ne->host, nodeid));
1259                 ne->nodeid = nodeid;
1260         }
1261
1262         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1263                 kfree(ne->csr->private);
1264                 csr1212_destroy_csr(ne->csr);
1265                 ne->csr = csr;
1266
1267                 /* If the node's configrom generation has changed, we
1268                  * unregister all the unit directories. */
1269                 nodemgr_remove_uds(ne);
1270
1271                 nodemgr_update_bus_options(ne);
1272
1273                 /* Mark the node as new, so it gets re-probed */
1274                 ne->needs_probe = 1;
1275         } else {
1276                 /* old cache is valid, so update its generation */
1277                 struct nodemgr_csr_info *ci = ne->csr->private;
1278                 ci->generation = generation;
1279                 /* free the partially filled now unneeded new cache */
1280                 kfree(csr->private);
1281                 csr1212_destroy_csr(csr);
1282         }
1283
1284         if (ne->in_limbo)
1285                 nodemgr_resume_ne(ne);
1286
1287         /* Mark the node current */
1288         ne->generation = generation;
1289 }
1290
1291
1292
1293 static void nodemgr_node_scan_one(struct host_info *hi,
1294                                   nodeid_t nodeid, int generation)
1295 {
1296         struct hpsb_host *host = hi->host;
1297         struct node_entry *ne;
1298         octlet_t guid;
1299         struct csr1212_csr *csr;
1300         struct nodemgr_csr_info *ci;
1301         u8 *speed;
1302
1303         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1304         if (!ci)
1305                 return;
1306
1307         ci->host = host;
1308         ci->nodeid = nodeid;
1309         ci->generation = generation;
1310
1311         /* Prepare for speed probe which occurs when reading the ROM */
1312         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1313         if (*speed > host->csr.lnk_spd)
1314                 *speed = host->csr.lnk_spd;
1315         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1316
1317         /* We need to detect when the ConfigROM's generation has changed,
1318          * so we only update the node's info when it needs to be.  */
1319
1320         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1321         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1322                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1323                          NODE_BUS_ARGS(host, nodeid));
1324                 if (csr)
1325                         csr1212_destroy_csr(csr);
1326                 kfree(ci);
1327                 return;
1328         }
1329
1330         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1331                 /* This isn't a 1394 device, but we let it slide. There
1332                  * was a report of a device with broken firmware which
1333                  * reported '2394' instead of '1394', which is obviously a
1334                  * mistake. One would hope that a non-1394 device never
1335                  * gets connected to Firewire bus. If someone does, we
1336                  * shouldn't be held responsible, so we'll allow it with a
1337                  * warning.  */
1338                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1339                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1340         }
1341
1342         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1343         ne = find_entry_by_guid(guid);
1344
1345         if (ne && ne->host != host && ne->in_limbo) {
1346                 /* Must have moved this device from one host to another */
1347                 nodemgr_remove_ne(ne);
1348                 ne = NULL;
1349         }
1350
1351         if (!ne)
1352                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1353         else
1354                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1355 }
1356
1357
1358 static void nodemgr_node_scan(struct host_info *hi, int generation)
1359 {
1360         int count;
1361         struct hpsb_host *host = hi->host;
1362         struct selfid *sid = (struct selfid *)host->topology_map;
1363         nodeid_t nodeid = LOCAL_BUS;
1364
1365         /* Scan each node on the bus */
1366         for (count = host->selfid_count; count; count--, sid++) {
1367                 if (sid->extended)
1368                         continue;
1369
1370                 if (!sid->link_active) {
1371                         nodeid++;
1372                         continue;
1373                 }
1374                 nodemgr_node_scan_one(hi, nodeid++, generation);
1375         }
1376 }
1377
1378
1379 static void nodemgr_suspend_ne(struct node_entry *ne)
1380 {
1381         struct class_device *cdev;
1382         struct unit_directory *ud;
1383
1384         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1385                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1386
1387         ne->in_limbo = 1;
1388         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1389
1390         down(&nodemgr_ud_class.sem);
1391         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1392                 ud = container_of(cdev, struct unit_directory, class_dev);
1393                 if (ud->ne != ne)
1394                         continue;
1395
1396                 down_write(&ieee1394_bus_type.subsys.rwsem);
1397                 if (ud->device.driver &&
1398                     (!ud->device.driver->suspend ||
1399                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1400                         device_release_driver(&ud->device);
1401                 up_write(&ieee1394_bus_type.subsys.rwsem);
1402         }
1403         up(&nodemgr_ud_class.sem);
1404 }
1405
1406
1407 static void nodemgr_resume_ne(struct node_entry *ne)
1408 {
1409         struct class_device *cdev;
1410         struct unit_directory *ud;
1411
1412         ne->in_limbo = 0;
1413         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1414
1415         down(&nodemgr_ud_class.sem);
1416         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1417                 ud = container_of(cdev, struct unit_directory, class_dev);
1418                 if (ud->ne != ne)
1419                         continue;
1420
1421                 down_read(&ieee1394_bus_type.subsys.rwsem);
1422                 if (ud->device.driver && ud->device.driver->resume)
1423                         ud->device.driver->resume(&ud->device);
1424                 up_read(&ieee1394_bus_type.subsys.rwsem);
1425         }
1426         up(&nodemgr_ud_class.sem);
1427
1428         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1429                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1430 }
1431
1432
1433 static void nodemgr_update_pdrv(struct node_entry *ne)
1434 {
1435         struct unit_directory *ud;
1436         struct hpsb_protocol_driver *pdrv;
1437         struct class_device *cdev;
1438
1439         down(&nodemgr_ud_class.sem);
1440         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1441                 ud = container_of(cdev, struct unit_directory, class_dev);
1442                 if (ud->ne != ne)
1443                         continue;
1444
1445                 down_write(&ieee1394_bus_type.subsys.rwsem);
1446                 if (ud->device.driver) {
1447                         pdrv = container_of(ud->device.driver,
1448                                             struct hpsb_protocol_driver,
1449                                             driver);
1450                         if (pdrv->update && pdrv->update(ud))
1451                                 device_release_driver(&ud->device);
1452                 }
1453                 up_write(&ieee1394_bus_type.subsys.rwsem);
1454         }
1455         up(&nodemgr_ud_class.sem);
1456 }
1457
1458
1459 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1460  * seems like an optional service but in the end it is practically mandatory
1461  * as a consequence of these clauses.
1462  *
1463  * Note that we cannot do a broadcast write to all nodes at once because some
1464  * pre-1394a devices would hang. */
1465 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1466 {
1467         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1468         quadlet_t bc_remote, bc_local;
1469         int error;
1470
1471         if (!ne->host->is_irm || ne->generation != generation ||
1472             ne->nodeid == ne->host->node_id)
1473                 return;
1474
1475         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1476
1477         /* Check if the register is implemented and 1394a compliant. */
1478         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1479                           sizeof(bc_remote));
1480         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1481             bc_remote != bc_local)
1482                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1483 }
1484
1485
1486 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1487 {
1488         struct device *dev;
1489
1490         if (ne->host != hi->host || ne->in_limbo)
1491                 return;
1492
1493         dev = get_device(&ne->device);
1494         if (!dev)
1495                 return;
1496
1497         nodemgr_irm_write_bc(ne, generation);
1498
1499         /* If "needs_probe", then this is either a new or changed node we
1500          * rescan totally. If the generation matches for an existing node
1501          * (one that existed prior to the bus reset) we send update calls
1502          * down to the drivers. Otherwise, this is a dead node and we
1503          * suspend it. */
1504         if (ne->needs_probe)
1505                 nodemgr_process_root_directory(hi, ne);
1506         else if (ne->generation == generation)
1507                 nodemgr_update_pdrv(ne);
1508         else
1509                 nodemgr_suspend_ne(ne);
1510
1511         put_device(dev);
1512 }
1513
1514
1515 static void nodemgr_node_probe(struct host_info *hi, int generation)
1516 {
1517         struct hpsb_host *host = hi->host;
1518         struct class_device *cdev;
1519         struct node_entry *ne;
1520
1521         /* Do some processing of the nodes we've probed. This pulls them
1522          * into the sysfs layer if needed, and can result in processing of
1523          * unit-directories, or just updating the node and it's
1524          * unit-directories.
1525          *
1526          * Run updates before probes. Usually, updates are time-critical
1527          * while probes are time-consuming. (Well, those probes need some
1528          * improvement...) */
1529
1530         down(&nodemgr_ne_class.sem);
1531         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1532                 ne = container_of(cdev, struct node_entry, class_dev);
1533                 if (!ne->needs_probe)
1534                         nodemgr_probe_ne(hi, ne, generation);
1535         }
1536         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1537                 ne = container_of(cdev, struct node_entry, class_dev);
1538                 if (ne->needs_probe)
1539                         nodemgr_probe_ne(hi, ne, generation);
1540         }
1541         up(&nodemgr_ne_class.sem);
1542
1543
1544         /* If we had a bus reset while we were scanning the bus, it is
1545          * possible that we did not probe all nodes.  In that case, we
1546          * skip the clean up for now, since we could remove nodes that
1547          * were still on the bus.  Another bus scan is pending which will
1548          * do the clean up eventually.
1549          *
1550          * Now let's tell the bus to rescan our devices. This may seem
1551          * like overhead, but the driver-model core will only scan a
1552          * device for a driver when either the device is added, or when a
1553          * new driver is added. A bus reset is a good reason to rescan
1554          * devices that were there before.  For example, an sbp2 device
1555          * may become available for login, if the host that held it was
1556          * just removed.  */
1557
1558         if (generation == get_hpsb_generation(host))
1559                 if (bus_rescan_devices(&ieee1394_bus_type))
1560                         HPSB_DEBUG("bus_rescan_devices had an error");
1561 }
1562
1563 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1564 {
1565         struct hpsb_packet *packet;
1566         int error = -ENOMEM;
1567
1568         packet = hpsb_make_phypacket(host,
1569                         EXTPHYPACKET_TYPE_RESUME |
1570                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1571         if (packet) {
1572                 packet->no_waiter = 1;
1573                 packet->generation = get_hpsb_generation(host);
1574                 error = hpsb_send_packet(packet);
1575         }
1576         if (error)
1577                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1578                           host->id);
1579         return error;
1580 }
1581
1582 /* Perform a few high-level IRM responsibilities. */
1583 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1584 {
1585         quadlet_t bc;
1586
1587         /* if irm_id == -1 then there is no IRM on this bus */
1588         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1589                 return 1;
1590
1591         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1592         host->csr.broadcast_channel |= 0x40000000;
1593
1594         /* If there is no bus manager then we should set the root node's
1595          * force_root bit to promote bus stability per the 1394
1596          * spec. (8.4.2.6) */
1597         if (host->busmgr_id == 0xffff && host->node_count > 1)
1598         {
1599                 u16 root_node = host->node_count - 1;
1600
1601                 /* get cycle master capability flag from root node */
1602                 if (host->is_cycmst ||
1603                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1604                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1605                                 &bc, sizeof(quadlet_t)) &&
1606                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1607                         hpsb_send_phy_config(host, root_node, -1);
1608                 else {
1609                         HPSB_DEBUG("The root node is not cycle master capable; "
1610                                    "selecting a new root node and resetting...");
1611
1612                         if (cycles >= 5) {
1613                                 /* Oh screw it! Just leave the bus as it is */
1614                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1615                                 return 1;
1616                         }
1617
1618                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1619                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1620
1621                         return 0;
1622                 }
1623         }
1624
1625         /* Some devices suspend their ports while being connected to an inactive
1626          * host adapter, i.e. if connected before the low-level driver is
1627          * loaded.  They become visible either when physically unplugged and
1628          * replugged, or when receiving a resume packet.  Send one once. */
1629         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1630                 host->resume_packet_sent = 1;
1631
1632         return 1;
1633 }
1634
1635 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1636  * everything we can do, otherwise issue a bus reset and try to become the IRM
1637  * ourselves. */
1638 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1639 {
1640         quadlet_t bc;
1641         int status;
1642
1643         if (hpsb_disable_irm || host->is_irm)
1644                 return 1;
1645
1646         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1647                            get_hpsb_generation(host),
1648                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1649                            &bc, sizeof(quadlet_t));
1650
1651         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1652                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1653                  * register and we do, so reset the bus with force_root set */
1654                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1655
1656                 if (cycles >= 5) {
1657                         /* Oh screw it! Just leave the bus as it is */
1658                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1659                         return 1;
1660                 }
1661
1662                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1663                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1664
1665                 return 0;
1666         }
1667
1668         return 1;
1669 }
1670
1671 static int nodemgr_host_thread(void *__hi)
1672 {
1673         struct host_info *hi = (struct host_info *)__hi;
1674         struct hpsb_host *host = hi->host;
1675         unsigned int g, generation = 0;
1676         int i, reset_cycles = 0;
1677
1678         /* Setup our device-model entries */
1679         nodemgr_create_host_dev_files(host);
1680
1681         for (;;) {
1682                 /* Sleep until next bus reset */
1683                 set_current_state(TASK_INTERRUPTIBLE);
1684                 if (get_hpsb_generation(host) == generation &&
1685                     !kthread_should_stop())
1686                         schedule();
1687                 __set_current_state(TASK_RUNNING);
1688
1689                 /* Thread may have been woken up to freeze or to exit */
1690                 if (try_to_freeze())
1691                         continue;
1692                 if (kthread_should_stop())
1693                         goto exit;
1694
1695                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1696                         if (try_to_freeze())
1697                                 continue;
1698                         goto exit;
1699                 }
1700
1701                 /* Pause for 1/4 second in 1/16 second intervals,
1702                  * to make sure things settle down. */
1703                 g = get_hpsb_generation(host);
1704                 for (i = 0; i < 4 ; i++) {
1705                         if (msleep_interruptible(63) || kthread_should_stop())
1706                                 goto unlock_exit;
1707
1708                         /* Now get the generation in which the node ID's we collect
1709                          * are valid.  During the bus scan we will use this generation
1710                          * for the read transactions, so that if another reset occurs
1711                          * during the scan the transactions will fail instead of
1712                          * returning bogus data. */
1713                         generation = get_hpsb_generation(host);
1714
1715                         /* If we get a reset before we are done waiting, then
1716                          * start the the waiting over again */
1717                         if (generation != g)
1718                                 g = generation, i = 0;
1719                 }
1720
1721                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1722                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1723                         reset_cycles++;
1724                         mutex_unlock(&nodemgr_serialize);
1725                         continue;
1726                 }
1727                 reset_cycles = 0;
1728
1729                 /* Scan our nodes to get the bus options and create node
1730                  * entries. This does not do the sysfs stuff, since that
1731                  * would trigger uevents and such, which is a bad idea at
1732                  * this point. */
1733                 nodemgr_node_scan(hi, generation);
1734
1735                 /* This actually does the full probe, with sysfs
1736                  * registration. */
1737                 nodemgr_node_probe(hi, generation);
1738
1739                 /* Update some of our sysfs symlinks */
1740                 nodemgr_update_host_dev_links(host);
1741
1742                 mutex_unlock(&nodemgr_serialize);
1743         }
1744 unlock_exit:
1745         mutex_unlock(&nodemgr_serialize);
1746 exit:
1747         HPSB_VERBOSE("NodeMgr: Exiting thread");
1748         return 0;
1749 }
1750
1751 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1752 {
1753         struct class_device *cdev;
1754         struct hpsb_host *host;
1755         int error = 0;
1756
1757         down(&hpsb_host_class.sem);
1758         list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1759                 host = container_of(cdev, struct hpsb_host, class_dev);
1760
1761                 if ((error = cb(host, __data)))
1762                         break;
1763         }
1764         up(&hpsb_host_class.sem);
1765
1766         return error;
1767 }
1768
1769 /* The following four convenience functions use a struct node_entry
1770  * for addressing a node on the bus.  They are intended for use by any
1771  * process context, not just the nodemgr thread, so we need to be a
1772  * little careful when reading out the node ID and generation.  The
1773  * thing that can go wrong is that we get the node ID, then a bus
1774  * reset occurs, and then we read the generation.  The node ID is
1775  * possibly invalid, but the generation is current, and we end up
1776  * sending a packet to a the wrong node.
1777  *
1778  * The solution is to make sure we read the generation first, so that
1779  * if a reset occurs in the process, we end up with a stale generation
1780  * and the transactions will fail instead of silently using wrong node
1781  * ID's.
1782  */
1783
1784 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1785 {
1786         pkt->host = ne->host;
1787         pkt->generation = ne->generation;
1788         barrier();
1789         pkt->node_id = ne->nodeid;
1790 }
1791
1792 int hpsb_node_write(struct node_entry *ne, u64 addr,
1793                     quadlet_t *buffer, size_t length)
1794 {
1795         unsigned int generation = ne->generation;
1796
1797         barrier();
1798         return hpsb_write(ne->host, ne->nodeid, generation,
1799                           addr, buffer, length);
1800 }
1801
1802 static void nodemgr_add_host(struct hpsb_host *host)
1803 {
1804         struct host_info *hi;
1805
1806         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1807         if (!hi) {
1808                 HPSB_ERR("NodeMgr: out of memory in add host");
1809                 return;
1810         }
1811         hi->host = host;
1812         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1813                                  host->id);
1814         if (IS_ERR(hi->thread)) {
1815                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1816                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1817         }
1818 }
1819
1820 static void nodemgr_host_reset(struct hpsb_host *host)
1821 {
1822         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1823
1824         if (hi) {
1825                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1826                 wake_up_process(hi->thread);
1827         }
1828 }
1829
1830 static void nodemgr_remove_host(struct hpsb_host *host)
1831 {
1832         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1833
1834         if (hi) {
1835                 kthread_stop(hi->thread);
1836                 nodemgr_remove_host_dev(&host->device);
1837         }
1838 }
1839
1840 static struct hpsb_highlevel nodemgr_highlevel = {
1841         .name =         "Node manager",
1842         .add_host =     nodemgr_add_host,
1843         .host_reset =   nodemgr_host_reset,
1844         .remove_host =  nodemgr_remove_host,
1845 };
1846
1847 int init_ieee1394_nodemgr(void)
1848 {
1849         int error;
1850
1851         error = class_register(&nodemgr_ne_class);
1852         if (error)
1853                 goto fail_ne;
1854         error = class_register(&nodemgr_ud_class);
1855         if (error)
1856                 goto fail_ud;
1857         error = driver_register(&nodemgr_mid_layer_driver);
1858         if (error)
1859                 goto fail_ml;
1860         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1861         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1862
1863         hpsb_register_highlevel(&nodemgr_highlevel);
1864         return 0;
1865
1866 fail_ml:
1867         class_unregister(&nodemgr_ud_class);
1868 fail_ud:
1869         class_unregister(&nodemgr_ne_class);
1870 fail_ne:
1871         return error;
1872 }
1873
1874 void cleanup_ieee1394_nodemgr(void)
1875 {
1876         hpsb_unregister_highlevel(&nodemgr_highlevel);
1877         driver_unregister(&nodemgr_mid_layer_driver);
1878         class_unregister(&nodemgr_ud_class);
1879         class_unregister(&nodemgr_ne_class);
1880 }