Commit | Line | Data |
---|---|---|
c781c06d KH |
1 | /* |
2 | * Device probing and sysfs code. | |
19a15b93 KH |
3 | * |
4 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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. | |
19 | */ | |
20 | ||
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> | |
a3aca3da | 27 | #include <linux/idr.h> |
633c52dc SR |
28 | #include <linux/rwsem.h> |
29 | #include <asm/semaphore.h> | |
7feb9cce | 30 | #include <linux/ctype.h> |
19a15b93 KH |
31 | #include "fw-transaction.h" |
32 | #include "fw-topology.h" | |
33 | #include "fw-device.h" | |
34 | ||
35 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
36 | { | |
37 | ci->p = p + 1; | |
38 | ci->end = ci->p + (p[0] >> 16); | |
39 | } | |
19a15b93 KH |
40 | EXPORT_SYMBOL(fw_csr_iterator_init); |
41 | ||
42 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
43 | { | |
44 | *key = *ci->p >> 24; | |
45 | *value = *ci->p & 0xffffff; | |
46 | ||
47 | return ci->p++ < ci->end; | |
48 | } | |
19a15b93 KH |
49 | EXPORT_SYMBOL(fw_csr_iterator_next); |
50 | ||
51 | static int is_fw_unit(struct device *dev); | |
52 | ||
21ebcd12 | 53 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
54 | { |
55 | struct fw_csr_iterator ci; | |
56 | int key, value, match; | |
57 | ||
58 | match = 0; | |
59 | fw_csr_iterator_init(&ci, directory); | |
60 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
61 | if (key == CSR_VENDOR && value == id->vendor) | |
62 | match |= FW_MATCH_VENDOR; | |
63 | if (key == CSR_MODEL && value == id->model) | |
64 | match |= FW_MATCH_MODEL; | |
65 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
66 | match |= FW_MATCH_SPECIFIER_ID; | |
67 | if (key == CSR_VERSION && value == id->version) | |
68 | match |= FW_MATCH_VERSION; | |
69 | } | |
70 | ||
71 | return (match & id->match_flags) == id->match_flags; | |
72 | } | |
73 | ||
74 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
75 | { | |
76 | struct fw_unit *unit = fw_unit(dev); | |
77 | struct fw_driver *driver = fw_driver(drv); | |
78 | int i; | |
79 | ||
80 | /* We only allow binding to fw_units. */ | |
81 | if (!is_fw_unit(dev)) | |
82 | return 0; | |
83 | ||
84 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
85 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
86 | return 1; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
93 | { | |
94 | struct fw_device *device = fw_device(unit->device.parent); | |
95 | struct fw_csr_iterator ci; | |
96 | ||
97 | int key, value; | |
98 | int vendor = 0; | |
99 | int model = 0; | |
100 | int specifier_id = 0; | |
101 | int version = 0; | |
102 | ||
103 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
104 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
105 | switch (key) { | |
106 | case CSR_VENDOR: | |
107 | vendor = value; | |
108 | break; | |
109 | case CSR_MODEL: | |
110 | model = value; | |
111 | break; | |
112 | } | |
113 | } | |
114 | ||
115 | fw_csr_iterator_init(&ci, unit->directory); | |
116 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
117 | switch (key) { | |
118 | case CSR_SPECIFIER_ID: | |
119 | specifier_id = value; | |
120 | break; | |
121 | case CSR_VERSION: | |
122 | version = value; | |
123 | break; | |
124 | } | |
125 | } | |
126 | ||
127 | return snprintf(buffer, buffer_size, | |
128 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
129 | vendor, model, specifier_id, version); | |
130 | } | |
131 | ||
132 | static int | |
7eff2e7a | 133 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
134 | { |
135 | struct fw_unit *unit = fw_unit(dev); | |
136 | char modalias[64]; | |
19a15b93 | 137 | |
2d826cc5 | 138 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 139 | |
7eff2e7a | 140 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
141 | return -ENOMEM; |
142 | ||
19a15b93 KH |
143 | return 0; |
144 | } | |
145 | ||
146 | struct bus_type fw_bus_type = { | |
362c2c8c | 147 | .name = "firewire", |
19a15b93 | 148 | .match = fw_unit_match, |
19a15b93 | 149 | }; |
19a15b93 KH |
150 | EXPORT_SYMBOL(fw_bus_type); |
151 | ||
0b6aa3d0 | 152 | struct fw_device *fw_device_get(struct fw_device *device) |
19a15b93 KH |
153 | { |
154 | get_device(&device->device); | |
155 | ||
156 | return device; | |
157 | } | |
158 | ||
0b6aa3d0 | 159 | void fw_device_put(struct fw_device *device) |
19a15b93 KH |
160 | { |
161 | put_device(&device->device); | |
162 | } | |
163 | ||
164 | static void fw_device_release(struct device *dev) | |
165 | { | |
166 | struct fw_device *device = fw_device(dev); | |
167 | unsigned long flags; | |
168 | ||
c781c06d KH |
169 | /* |
170 | * Take the card lock so we don't set this to NULL while a | |
171 | * FW_NODE_UPDATED callback is being handled. | |
172 | */ | |
19a15b93 KH |
173 | spin_lock_irqsave(&device->card->lock, flags); |
174 | device->node->data = NULL; | |
175 | spin_unlock_irqrestore(&device->card->lock, flags); | |
176 | ||
177 | fw_node_put(device->node); | |
178 | fw_card_put(device->card); | |
179 | kfree(device->config_rom); | |
180 | kfree(device); | |
181 | } | |
182 | ||
183 | int fw_device_enable_phys_dma(struct fw_device *device) | |
184 | { | |
185 | return device->card->driver->enable_phys_dma(device->card, | |
186 | device->node_id, | |
187 | device->generation); | |
188 | } | |
19a15b93 KH |
189 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
190 | ||
7feb9cce KH |
191 | struct config_rom_attribute { |
192 | struct device_attribute attr; | |
193 | u32 key; | |
194 | }; | |
195 | ||
196 | static ssize_t | |
197 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
198 | { | |
199 | struct config_rom_attribute *attr = | |
200 | container_of(dattr, struct config_rom_attribute, attr); | |
201 | struct fw_csr_iterator ci; | |
202 | u32 *dir; | |
203 | int key, value; | |
204 | ||
205 | if (is_fw_unit(dev)) | |
206 | dir = fw_unit(dev)->directory; | |
207 | else | |
208 | dir = fw_device(dev)->config_rom + 5; | |
209 | ||
210 | fw_csr_iterator_init(&ci, dir); | |
211 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
212 | if (attr->key == key) | |
213 | return snprintf(buf, buf ? PAGE_SIZE : 0, | |
214 | "0x%06x\n", value); | |
215 | ||
216 | return -ENOENT; | |
217 | } | |
218 | ||
219 | #define IMMEDIATE_ATTR(name, key) \ | |
220 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
221 | ||
222 | static ssize_t | |
223 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
224 | { | |
225 | struct config_rom_attribute *attr = | |
226 | container_of(dattr, struct config_rom_attribute, attr); | |
227 | struct fw_csr_iterator ci; | |
228 | u32 *dir, *block = NULL, *p, *end; | |
229 | int length, key, value, last_key = 0; | |
230 | char *b; | |
231 | ||
232 | if (is_fw_unit(dev)) | |
233 | dir = fw_unit(dev)->directory; | |
234 | else | |
235 | dir = fw_device(dev)->config_rom + 5; | |
236 | ||
237 | fw_csr_iterator_init(&ci, dir); | |
238 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
239 | if (attr->key == last_key && | |
240 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
241 | block = ci.p - 1 + value; | |
242 | last_key = key; | |
243 | } | |
244 | ||
245 | if (block == NULL) | |
246 | return -ENOENT; | |
247 | ||
248 | length = min(block[0] >> 16, 256U); | |
249 | if (length < 3) | |
250 | return -ENOENT; | |
251 | ||
252 | if (block[1] != 0 || block[2] != 0) | |
253 | /* Unknown encoding. */ | |
254 | return -ENOENT; | |
255 | ||
256 | if (buf == NULL) | |
257 | return length * 4; | |
258 | ||
259 | b = buf; | |
260 | end = &block[length + 1]; | |
261 | for (p = &block[3]; p < end; p++, b += 4) | |
262 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
263 | ||
264 | /* Strip trailing whitespace and add newline. */ | |
265 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
266 | strcpy(b + 1, "\n"); | |
267 | ||
268 | return b + 2 - buf; | |
269 | } | |
270 | ||
271 | #define TEXT_LEAF_ATTR(name, key) \ | |
272 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
273 | ||
274 | static struct config_rom_attribute config_rom_attributes[] = { | |
275 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
276 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
277 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
278 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
279 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
280 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
281 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
282 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
283 | }; | |
284 | ||
285 | static void | |
6f2e53d5 KH |
286 | init_fw_attribute_group(struct device *dev, |
287 | struct device_attribute *attrs, | |
288 | struct fw_attribute_group *group) | |
7feb9cce KH |
289 | { |
290 | struct device_attribute *attr; | |
6f2e53d5 KH |
291 | int i, j; |
292 | ||
293 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
294 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
295 | |
296 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
297 | attr = &config_rom_attributes[i].attr; | |
298 | if (attr->show(dev, attr, NULL) < 0) | |
299 | continue; | |
6f2e53d5 | 300 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
301 | } |
302 | ||
6f2e53d5 KH |
303 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
304 | group->attrs[j++] = NULL; | |
305 | group->groups[0] = &group->group; | |
306 | group->groups[1] = NULL; | |
307 | group->group.attrs = group->attrs; | |
308 | dev->groups = group->groups; | |
7feb9cce KH |
309 | } |
310 | ||
19a15b93 | 311 | static ssize_t |
21351dbe KH |
312 | modalias_show(struct device *dev, |
313 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
314 | { |
315 | struct fw_unit *unit = fw_unit(dev); | |
316 | int length; | |
317 | ||
318 | length = get_modalias(unit, buf, PAGE_SIZE); | |
319 | strcpy(buf + length, "\n"); | |
320 | ||
321 | return length + 1; | |
322 | } | |
323 | ||
19a15b93 | 324 | static ssize_t |
21351dbe KH |
325 | rom_index_show(struct device *dev, |
326 | struct device_attribute *attr, char *buf) | |
19a15b93 | 327 | { |
21351dbe KH |
328 | struct fw_device *device = fw_device(dev->parent); |
329 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 330 | |
21351dbe KH |
331 | return snprintf(buf, PAGE_SIZE, "%d\n", |
332 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
333 | } |
334 | ||
21351dbe KH |
335 | static struct device_attribute fw_unit_attributes[] = { |
336 | __ATTR_RO(modalias), | |
337 | __ATTR_RO(rom_index), | |
338 | __ATTR_NULL, | |
19a15b93 KH |
339 | }; |
340 | ||
048961ef | 341 | static ssize_t |
bbd14945 | 342 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 343 | { |
21351dbe | 344 | struct fw_device *device = fw_device(dev); |
048961ef | 345 | |
21351dbe KH |
346 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
347 | ||
348 | return device->config_rom_length * 4; | |
048961ef KH |
349 | } |
350 | ||
bbd14945 KH |
351 | static ssize_t |
352 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
353 | { | |
354 | struct fw_device *device = fw_device(dev); | |
355 | u64 guid; | |
356 | ||
357 | guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4]; | |
358 | ||
3e1dcb00 AM |
359 | return snprintf(buf, PAGE_SIZE, "0x%016llx\n", |
360 | (unsigned long long)guid); | |
bbd14945 KH |
361 | } |
362 | ||
21351dbe KH |
363 | static struct device_attribute fw_device_attributes[] = { |
364 | __ATTR_RO(config_rom), | |
bbd14945 | 365 | __ATTR_RO(guid), |
21351dbe | 366 | __ATTR_NULL, |
048961ef KH |
367 | }; |
368 | ||
19a15b93 KH |
369 | struct read_quadlet_callback_data { |
370 | struct completion done; | |
371 | int rcode; | |
372 | u32 data; | |
373 | }; | |
374 | ||
375 | static void | |
376 | complete_transaction(struct fw_card *card, int rcode, | |
377 | void *payload, size_t length, void *data) | |
378 | { | |
379 | struct read_quadlet_callback_data *callback_data = data; | |
380 | ||
381 | if (rcode == RCODE_COMPLETE) | |
382 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
383 | callback_data->rcode = rcode; | |
384 | complete(&callback_data->done); | |
385 | } | |
386 | ||
387 | static int read_rom(struct fw_device *device, int index, u32 * data) | |
388 | { | |
389 | struct read_quadlet_callback_data callback_data; | |
390 | struct fw_transaction t; | |
391 | u64 offset; | |
392 | ||
393 | init_completion(&callback_data.done); | |
394 | ||
395 | offset = 0xfffff0000400ULL + index * 4; | |
396 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, | |
f1397490 | 397 | device->node_id, device->generation, device->max_speed, |
19a15b93 KH |
398 | offset, NULL, 4, complete_transaction, &callback_data); |
399 | ||
400 | wait_for_completion(&callback_data.done); | |
401 | ||
402 | *data = callback_data.data; | |
403 | ||
404 | return callback_data.rcode; | |
405 | } | |
406 | ||
407 | static int read_bus_info_block(struct fw_device *device) | |
408 | { | |
409 | static u32 rom[256]; | |
410 | u32 stack[16], sp, key; | |
411 | int i, end, length; | |
412 | ||
f1397490 SR |
413 | device->max_speed = SCODE_100; |
414 | ||
19a15b93 KH |
415 | /* First read the bus info block. */ |
416 | for (i = 0; i < 5; i++) { | |
417 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
418 | return -1; | |
c781c06d KH |
419 | /* |
420 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
421 | * reply with a 0 for the first quadlet of the config |
422 | * rom to indicate that they are booting (for example, | |
423 | * if the firmware is on the disk of a external | |
424 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
425 | * retry mechanism will try again later. |
426 | */ | |
19a15b93 KH |
427 | if (i == 0 && rom[i] == 0) |
428 | return -1; | |
429 | } | |
430 | ||
f1397490 SR |
431 | device->max_speed = device->node->max_speed; |
432 | ||
433 | /* | |
434 | * Determine the speed of | |
435 | * - devices with link speed less than PHY speed, | |
436 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
437 | * - all devices if there are 1394b repeaters. | |
438 | * Note, we cannot use the bus info block's link_spd as starting point | |
439 | * because some buggy firmwares set it lower than necessary and because | |
440 | * 1394-1995 nodes do not have the field. | |
441 | */ | |
442 | if ((rom[2] & 0x7) < device->max_speed || | |
443 | device->max_speed == SCODE_BETA || | |
444 | device->card->beta_repeaters_present) { | |
445 | u32 dummy; | |
446 | ||
447 | /* for S1600 and S3200 */ | |
448 | if (device->max_speed == SCODE_BETA) | |
449 | device->max_speed = device->card->link_speed; | |
450 | ||
451 | while (device->max_speed > SCODE_100) { | |
452 | if (read_rom(device, 0, &dummy) == RCODE_COMPLETE) | |
453 | break; | |
454 | device->max_speed--; | |
455 | } | |
456 | } | |
457 | ||
c781c06d KH |
458 | /* |
459 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
460 | * directory structure so we parse it using a stack of |
461 | * references to the blocks that make up the structure. We | |
462 | * push a reference to the root directory on the stack to | |
c781c06d KH |
463 | * start things off. |
464 | */ | |
19a15b93 KH |
465 | length = i; |
466 | sp = 0; | |
467 | stack[sp++] = 0xc0000005; | |
468 | while (sp > 0) { | |
c781c06d KH |
469 | /* |
470 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
471 | * lower 24 bits is the offset into the config rom, |
472 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
473 | * block. |
474 | */ | |
19a15b93 KH |
475 | key = stack[--sp]; |
476 | i = key & 0xffffff; | |
477 | if (i >= ARRAY_SIZE(rom)) | |
c781c06d KH |
478 | /* |
479 | * The reference points outside the standard | |
480 | * config rom area, something's fishy. | |
481 | */ | |
19a15b93 KH |
482 | return -1; |
483 | ||
484 | /* Read header quadlet for the block to get the length. */ | |
485 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
486 | return -1; | |
487 | end = i + (rom[i] >> 16) + 1; | |
488 | i++; | |
489 | if (end > ARRAY_SIZE(rom)) | |
c781c06d KH |
490 | /* |
491 | * This block extends outside standard config | |
19a15b93 KH |
492 | * area (and the array we're reading it |
493 | * into). That's broken, so ignore this | |
c781c06d KH |
494 | * device. |
495 | */ | |
19a15b93 KH |
496 | return -1; |
497 | ||
c781c06d KH |
498 | /* |
499 | * Now read in the block. If this is a directory | |
19a15b93 | 500 | * block, check the entries as we read them to see if |
c781c06d KH |
501 | * it references another block, and push it in that case. |
502 | */ | |
19a15b93 KH |
503 | while (i < end) { |
504 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
505 | return -1; | |
506 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && | |
507 | sp < ARRAY_SIZE(stack)) | |
508 | stack[sp++] = i + rom[i]; | |
509 | i++; | |
510 | } | |
511 | if (length < i) | |
512 | length = i; | |
513 | } | |
514 | ||
515 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); | |
516 | if (device->config_rom == NULL) | |
517 | return -1; | |
518 | memcpy(device->config_rom, rom, length * 4); | |
519 | device->config_rom_length = length; | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static void fw_unit_release(struct device *dev) | |
525 | { | |
526 | struct fw_unit *unit = fw_unit(dev); | |
527 | ||
528 | kfree(unit); | |
529 | } | |
530 | ||
21351dbe | 531 | static struct device_type fw_unit_type = { |
21351dbe KH |
532 | .uevent = fw_unit_uevent, |
533 | .release = fw_unit_release, | |
534 | }; | |
535 | ||
19a15b93 KH |
536 | static int is_fw_unit(struct device *dev) |
537 | { | |
21351dbe | 538 | return dev->type == &fw_unit_type; |
19a15b93 KH |
539 | } |
540 | ||
541 | static void create_units(struct fw_device *device) | |
542 | { | |
543 | struct fw_csr_iterator ci; | |
544 | struct fw_unit *unit; | |
545 | int key, value, i; | |
546 | ||
547 | i = 0; | |
548 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
549 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
550 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
551 | continue; | |
552 | ||
c781c06d KH |
553 | /* |
554 | * Get the address of the unit directory and try to | |
555 | * match the drivers id_tables against it. | |
556 | */ | |
2d826cc5 | 557 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
558 | if (unit == NULL) { |
559 | fw_error("failed to allocate memory for unit\n"); | |
560 | continue; | |
561 | } | |
562 | ||
563 | unit->directory = ci.p + value - 1; | |
564 | unit->device.bus = &fw_bus_type; | |
21351dbe | 565 | unit->device.type = &fw_unit_type; |
19a15b93 | 566 | unit->device.parent = &device->device; |
2d826cc5 | 567 | snprintf(unit->device.bus_id, sizeof(unit->device.bus_id), |
19a15b93 KH |
568 | "%s.%d", device->device.bus_id, i++); |
569 | ||
6f2e53d5 KH |
570 | init_fw_attribute_group(&unit->device, |
571 | fw_unit_attributes, | |
572 | &unit->attribute_group); | |
7feb9cce KH |
573 | if (device_register(&unit->device) < 0) |
574 | goto skip_unit; | |
575 | ||
7feb9cce KH |
576 | continue; |
577 | ||
7feb9cce KH |
578 | skip_unit: |
579 | kfree(unit); | |
19a15b93 KH |
580 | } |
581 | } | |
582 | ||
583 | static int shutdown_unit(struct device *device, void *data) | |
584 | { | |
21351dbe | 585 | device_unregister(device); |
19a15b93 KH |
586 | |
587 | return 0; | |
588 | } | |
589 | ||
dde2b954 | 590 | static DECLARE_RWSEM(idr_rwsem); |
a3aca3da KH |
591 | static DEFINE_IDR(fw_device_idr); |
592 | int fw_cdev_major; | |
593 | ||
594 | struct fw_device *fw_device_from_devt(dev_t devt) | |
595 | { | |
596 | struct fw_device *device; | |
597 | ||
dde2b954 | 598 | down_read(&idr_rwsem); |
a3aca3da | 599 | device = idr_find(&fw_device_idr, MINOR(devt)); |
dde2b954 | 600 | up_read(&idr_rwsem); |
a3aca3da KH |
601 | |
602 | return device; | |
603 | } | |
604 | ||
19a15b93 KH |
605 | static void fw_device_shutdown(struct work_struct *work) |
606 | { | |
607 | struct fw_device *device = | |
608 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
609 | int minor = MINOR(device->device.devt); |
610 | ||
dde2b954 | 611 | down_write(&idr_rwsem); |
a3aca3da | 612 | idr_remove(&fw_device_idr, minor); |
dde2b954 | 613 | up_write(&idr_rwsem); |
19a15b93 | 614 | |
2603bf21 | 615 | fw_device_cdev_remove(device); |
19a15b93 KH |
616 | device_for_each_child(&device->device, NULL, shutdown_unit); |
617 | device_unregister(&device->device); | |
618 | } | |
619 | ||
21351dbe | 620 | static struct device_type fw_device_type = { |
21351dbe KH |
621 | .release = fw_device_release, |
622 | }; | |
623 | ||
c781c06d KH |
624 | /* |
625 | * These defines control the retry behavior for reading the config | |
19a15b93 KH |
626 | * rom. It shouldn't be necessary to tweak these; if the device |
627 | * doesn't respond to a config rom read within 10 seconds, it's not | |
628 | * going to respond at all. As for the initial delay, a lot of | |
629 | * devices will be able to respond within half a second after bus | |
630 | * reset. On the other hand, it's not really worth being more | |
631 | * aggressive than that, since it scales pretty well; if 10 devices | |
c781c06d KH |
632 | * are plugged in, they're all getting read within one second. |
633 | */ | |
19a15b93 | 634 | |
c5dfd0a5 KH |
635 | #define MAX_RETRIES 10 |
636 | #define RETRY_DELAY (3 * HZ) | |
19a15b93 KH |
637 | #define INITIAL_DELAY (HZ / 2) |
638 | ||
639 | static void fw_device_init(struct work_struct *work) | |
640 | { | |
19a15b93 KH |
641 | struct fw_device *device = |
642 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 643 | int minor, err; |
19a15b93 | 644 | |
c781c06d KH |
645 | /* |
646 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 647 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
648 | * device. |
649 | */ | |
19a15b93 KH |
650 | |
651 | if (read_bus_info_block(device) < 0) { | |
652 | if (device->config_rom_retries < MAX_RETRIES) { | |
653 | device->config_rom_retries++; | |
654 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
655 | } else { | |
907293d7 | 656 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 657 | device->node_id); |
931c4834 KH |
658 | if (device->node == device->card->root_node) |
659 | schedule_delayed_work(&device->card->work, 0); | |
19a15b93 KH |
660 | fw_device_release(&device->device); |
661 | } | |
662 | return; | |
663 | } | |
664 | ||
a3aca3da | 665 | err = -ENOMEM; |
dde2b954 | 666 | down_write(&idr_rwsem); |
a3aca3da KH |
667 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) |
668 | err = idr_get_new(&fw_device_idr, device, &minor); | |
dde2b954 | 669 | up_write(&idr_rwsem); |
a3aca3da KH |
670 | if (err < 0) |
671 | goto error; | |
672 | ||
19a15b93 | 673 | device->device.bus = &fw_bus_type; |
21351dbe | 674 | device->device.type = &fw_device_type; |
19a15b93 | 675 | device->device.parent = device->card->device; |
a3aca3da | 676 | device->device.devt = MKDEV(fw_cdev_major, minor); |
2d826cc5 | 677 | snprintf(device->device.bus_id, sizeof(device->device.bus_id), |
a3aca3da | 678 | "fw%d", minor); |
19a15b93 | 679 | |
6f2e53d5 KH |
680 | init_fw_attribute_group(&device->device, |
681 | fw_device_attributes, | |
682 | &device->attribute_group); | |
19a15b93 KH |
683 | if (device_add(&device->device)) { |
684 | fw_error("Failed to add device.\n"); | |
a3aca3da | 685 | goto error_with_cdev; |
19a15b93 KH |
686 | } |
687 | ||
19a15b93 KH |
688 | create_units(device); |
689 | ||
c781c06d KH |
690 | /* |
691 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
692 | * out from under us while we did the intialization work, we |
693 | * have to shut down the device again here. Normally, though, | |
694 | * fw_node_event will be responsible for shutting it down when | |
695 | * necessary. We have to use the atomic cmpxchg here to avoid | |
696 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
697 | * fw_node_event(). |
698 | */ | |
641f8791 | 699 | if (atomic_cmpxchg(&device->state, |
19a15b93 KH |
700 | FW_DEVICE_INITIALIZING, |
701 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
702 | fw_device_shutdown(&device->work.work); | |
703 | else | |
f1397490 SR |
704 | fw_notify("created new fw device %s " |
705 | "(%d config rom retries, S%d00)\n", | |
706 | device->device.bus_id, device->config_rom_retries, | |
707 | 1 << device->max_speed); | |
19a15b93 | 708 | |
c781c06d KH |
709 | /* |
710 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
711 | * root node config rom. If this races with a bus reset we |
712 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
713 | * pretty harmless. |
714 | */ | |
19a15b93 KH |
715 | if (device->node == device->card->root_node) |
716 | schedule_delayed_work(&device->card->work, 0); | |
717 | ||
718 | return; | |
719 | ||
a3aca3da | 720 | error_with_cdev: |
dde2b954 | 721 | down_write(&idr_rwsem); |
a3aca3da | 722 | idr_remove(&fw_device_idr, minor); |
dde2b954 | 723 | up_write(&idr_rwsem); |
373b2edd | 724 | error: |
19a15b93 KH |
725 | put_device(&device->device); |
726 | } | |
727 | ||
728 | static int update_unit(struct device *dev, void *data) | |
729 | { | |
730 | struct fw_unit *unit = fw_unit(dev); | |
731 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
732 | ||
015b066f KH |
733 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
734 | down(&dev->sem); | |
19a15b93 | 735 | driver->update(unit); |
015b066f KH |
736 | up(&dev->sem); |
737 | } | |
19a15b93 KH |
738 | |
739 | return 0; | |
740 | } | |
741 | ||
5f480477 KH |
742 | static void fw_device_update(struct work_struct *work) |
743 | { | |
744 | struct fw_device *device = | |
745 | container_of(work, struct fw_device, work.work); | |
746 | ||
97bd9efa | 747 | fw_device_cdev_update(device); |
5f480477 KH |
748 | device_for_each_child(&device->device, NULL, update_unit); |
749 | } | |
750 | ||
19a15b93 KH |
751 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
752 | { | |
753 | struct fw_device *device; | |
754 | ||
19a15b93 KH |
755 | switch (event) { |
756 | case FW_NODE_CREATED: | |
757 | case FW_NODE_LINK_ON: | |
758 | if (!node->link_on) | |
759 | break; | |
760 | ||
761 | device = kzalloc(sizeof(*device), GFP_ATOMIC); | |
762 | if (device == NULL) | |
763 | break; | |
764 | ||
c781c06d KH |
765 | /* |
766 | * Do minimal intialization of the device here, the | |
19a15b93 KH |
767 | * rest will happen in fw_device_init(). We need the |
768 | * card and node so we can read the config rom and we | |
769 | * need to do device_initialize() now so | |
770 | * device_for_each_child() in FW_NODE_UPDATED is | |
c781c06d KH |
771 | * doesn't freak out. |
772 | */ | |
19a15b93 | 773 | device_initialize(&device->device); |
641f8791 | 774 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
19a15b93 KH |
775 | device->card = fw_card_get(card); |
776 | device->node = fw_node_get(node); | |
777 | device->node_id = node->node_id; | |
778 | device->generation = card->generation; | |
97bd9efa | 779 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 780 | |
c781c06d KH |
781 | /* |
782 | * Set the node data to point back to this device so | |
19a15b93 | 783 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
784 | * and generation for the device. |
785 | */ | |
19a15b93 KH |
786 | node->data = device; |
787 | ||
c781c06d KH |
788 | /* |
789 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
790 | * especially if they are bus powered and go through |
791 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
792 | * first config rom scan half a second after bus reset. |
793 | */ | |
19a15b93 KH |
794 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
795 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
796 | break; | |
797 | ||
798 | case FW_NODE_UPDATED: | |
799 | if (!node->link_on || node->data == NULL) | |
800 | break; | |
801 | ||
802 | device = node->data; | |
803 | device->node_id = node->node_id; | |
804 | device->generation = card->generation; | |
5f480477 KH |
805 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
806 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
807 | schedule_delayed_work(&device->work, 0); | |
808 | } | |
19a15b93 KH |
809 | break; |
810 | ||
811 | case FW_NODE_DESTROYED: | |
812 | case FW_NODE_LINK_OFF: | |
813 | if (!node->data) | |
814 | break; | |
815 | ||
c781c06d KH |
816 | /* |
817 | * Destroy the device associated with the node. There | |
19a15b93 KH |
818 | * are two cases here: either the device is fully |
819 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
820 | * process of reading its config rom | |
821 | * (FW_DEVICE_INITIALIZING). If it is fully | |
822 | * initialized we can reuse device->work to schedule a | |
823 | * full fw_device_shutdown(). If not, there's work | |
824 | * scheduled to read it's config rom, and we just put | |
825 | * the device in shutdown state to have that code fail | |
c781c06d KH |
826 | * to create the device. |
827 | */ | |
19a15b93 | 828 | device = node->data; |
641f8791 | 829 | if (atomic_xchg(&device->state, |
5f480477 KH |
830 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
831 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
832 | schedule_delayed_work(&device->work, 0); |
833 | } | |
834 | break; | |
835 | } | |
836 | } |