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19a15b93 KH |
1 | /* -*- c-basic-offset: 8 -*- |
2 | * | |
3 | * fw-device.c - Device probing and sysfs code. | |
4 | * | |
5 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software Foundation, | |
19 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/kthread.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/delay.h> | |
a3aca3da | 28 | #include <linux/idr.h> |
633c52dc SR |
29 | #include <linux/rwsem.h> |
30 | #include <asm/semaphore.h> | |
7feb9cce | 31 | #include <linux/ctype.h> |
19a15b93 KH |
32 | #include "fw-transaction.h" |
33 | #include "fw-topology.h" | |
34 | #include "fw-device.h" | |
35 | ||
36 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
37 | { | |
38 | ci->p = p + 1; | |
39 | ci->end = ci->p + (p[0] >> 16); | |
40 | } | |
19a15b93 KH |
41 | EXPORT_SYMBOL(fw_csr_iterator_init); |
42 | ||
43 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
44 | { | |
45 | *key = *ci->p >> 24; | |
46 | *value = *ci->p & 0xffffff; | |
47 | ||
48 | return ci->p++ < ci->end; | |
49 | } | |
19a15b93 KH |
50 | EXPORT_SYMBOL(fw_csr_iterator_next); |
51 | ||
52 | static int is_fw_unit(struct device *dev); | |
53 | ||
21ebcd12 | 54 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
55 | { |
56 | struct fw_csr_iterator ci; | |
57 | int key, value, match; | |
58 | ||
59 | match = 0; | |
60 | fw_csr_iterator_init(&ci, directory); | |
61 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
62 | if (key == CSR_VENDOR && value == id->vendor) | |
63 | match |= FW_MATCH_VENDOR; | |
64 | if (key == CSR_MODEL && value == id->model) | |
65 | match |= FW_MATCH_MODEL; | |
66 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
67 | match |= FW_MATCH_SPECIFIER_ID; | |
68 | if (key == CSR_VERSION && value == id->version) | |
69 | match |= FW_MATCH_VERSION; | |
70 | } | |
71 | ||
72 | return (match & id->match_flags) == id->match_flags; | |
73 | } | |
74 | ||
75 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
76 | { | |
77 | struct fw_unit *unit = fw_unit(dev); | |
78 | struct fw_driver *driver = fw_driver(drv); | |
79 | int i; | |
80 | ||
81 | /* We only allow binding to fw_units. */ | |
82 | if (!is_fw_unit(dev)) | |
83 | return 0; | |
84 | ||
85 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
86 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
87 | return 1; | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
94 | { | |
95 | struct fw_device *device = fw_device(unit->device.parent); | |
96 | struct fw_csr_iterator ci; | |
97 | ||
98 | int key, value; | |
99 | int vendor = 0; | |
100 | int model = 0; | |
101 | int specifier_id = 0; | |
102 | int version = 0; | |
103 | ||
104 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
105 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
106 | switch (key) { | |
107 | case CSR_VENDOR: | |
108 | vendor = value; | |
109 | break; | |
110 | case CSR_MODEL: | |
111 | model = value; | |
112 | break; | |
113 | } | |
114 | } | |
115 | ||
116 | fw_csr_iterator_init(&ci, unit->directory); | |
117 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
118 | switch (key) { | |
119 | case CSR_SPECIFIER_ID: | |
120 | specifier_id = value; | |
121 | break; | |
122 | case CSR_VERSION: | |
123 | version = value; | |
124 | break; | |
125 | } | |
126 | } | |
127 | ||
128 | return snprintf(buffer, buffer_size, | |
129 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
130 | vendor, model, specifier_id, version); | |
131 | } | |
132 | ||
133 | static int | |
134 | fw_unit_uevent(struct device *dev, char **envp, int num_envp, | |
135 | char *buffer, int buffer_size) | |
136 | { | |
137 | struct fw_unit *unit = fw_unit(dev); | |
138 | char modalias[64]; | |
139 | int length = 0; | |
140 | int i = 0; | |
141 | ||
19a15b93 KH |
142 | get_modalias(unit, modalias, sizeof modalias); |
143 | ||
144 | if (add_uevent_var(envp, num_envp, &i, | |
145 | buffer, buffer_size, &length, | |
146 | "MODALIAS=%s", modalias)) | |
147 | return -ENOMEM; | |
148 | ||
19a15b93 KH |
149 | envp[i] = NULL; |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | struct bus_type fw_bus_type = { | |
362c2c8c | 155 | .name = "firewire", |
19a15b93 | 156 | .match = fw_unit_match, |
19a15b93 | 157 | }; |
19a15b93 KH |
158 | EXPORT_SYMBOL(fw_bus_type); |
159 | ||
160 | extern struct fw_device *fw_device_get(struct fw_device *device) | |
161 | { | |
162 | get_device(&device->device); | |
163 | ||
164 | return device; | |
165 | } | |
166 | ||
167 | extern void fw_device_put(struct fw_device *device) | |
168 | { | |
169 | put_device(&device->device); | |
170 | } | |
171 | ||
172 | static void fw_device_release(struct device *dev) | |
173 | { | |
174 | struct fw_device *device = fw_device(dev); | |
175 | unsigned long flags; | |
176 | ||
177 | /* Take the card lock so we don't set this to NULL while a | |
178 | * FW_NODE_UPDATED callback is being handled. */ | |
179 | spin_lock_irqsave(&device->card->lock, flags); | |
180 | device->node->data = NULL; | |
181 | spin_unlock_irqrestore(&device->card->lock, flags); | |
182 | ||
183 | fw_node_put(device->node); | |
184 | fw_card_put(device->card); | |
185 | kfree(device->config_rom); | |
186 | kfree(device); | |
187 | } | |
188 | ||
189 | int fw_device_enable_phys_dma(struct fw_device *device) | |
190 | { | |
191 | return device->card->driver->enable_phys_dma(device->card, | |
192 | device->node_id, | |
193 | device->generation); | |
194 | } | |
19a15b93 KH |
195 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
196 | ||
7feb9cce KH |
197 | struct config_rom_attribute { |
198 | struct device_attribute attr; | |
199 | u32 key; | |
200 | }; | |
201 | ||
202 | static ssize_t | |
203 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
204 | { | |
205 | struct config_rom_attribute *attr = | |
206 | container_of(dattr, struct config_rom_attribute, attr); | |
207 | struct fw_csr_iterator ci; | |
208 | u32 *dir; | |
209 | int key, value; | |
210 | ||
211 | if (is_fw_unit(dev)) | |
212 | dir = fw_unit(dev)->directory; | |
213 | else | |
214 | dir = fw_device(dev)->config_rom + 5; | |
215 | ||
216 | fw_csr_iterator_init(&ci, dir); | |
217 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
218 | if (attr->key == key) | |
219 | return snprintf(buf, buf ? PAGE_SIZE : 0, | |
220 | "0x%06x\n", value); | |
221 | ||
222 | return -ENOENT; | |
223 | } | |
224 | ||
225 | #define IMMEDIATE_ATTR(name, key) \ | |
226 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
227 | ||
228 | static ssize_t | |
229 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
230 | { | |
231 | struct config_rom_attribute *attr = | |
232 | container_of(dattr, struct config_rom_attribute, attr); | |
233 | struct fw_csr_iterator ci; | |
234 | u32 *dir, *block = NULL, *p, *end; | |
235 | int length, key, value, last_key = 0; | |
236 | char *b; | |
237 | ||
238 | if (is_fw_unit(dev)) | |
239 | dir = fw_unit(dev)->directory; | |
240 | else | |
241 | dir = fw_device(dev)->config_rom + 5; | |
242 | ||
243 | fw_csr_iterator_init(&ci, dir); | |
244 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
245 | if (attr->key == last_key && | |
246 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
247 | block = ci.p - 1 + value; | |
248 | last_key = key; | |
249 | } | |
250 | ||
251 | if (block == NULL) | |
252 | return -ENOENT; | |
253 | ||
254 | length = min(block[0] >> 16, 256U); | |
255 | if (length < 3) | |
256 | return -ENOENT; | |
257 | ||
258 | if (block[1] != 0 || block[2] != 0) | |
259 | /* Unknown encoding. */ | |
260 | return -ENOENT; | |
261 | ||
262 | if (buf == NULL) | |
263 | return length * 4; | |
264 | ||
265 | b = buf; | |
266 | end = &block[length + 1]; | |
267 | for (p = &block[3]; p < end; p++, b += 4) | |
268 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
269 | ||
270 | /* Strip trailing whitespace and add newline. */ | |
271 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
272 | strcpy(b + 1, "\n"); | |
273 | ||
274 | return b + 2 - buf; | |
275 | } | |
276 | ||
277 | #define TEXT_LEAF_ATTR(name, key) \ | |
278 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
279 | ||
280 | static struct config_rom_attribute config_rom_attributes[] = { | |
281 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
282 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
283 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
284 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
285 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
286 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
287 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
288 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
289 | }; | |
290 | ||
291 | static void | |
292 | remove_config_rom_attributes(struct device *dev) | |
293 | { | |
294 | int i; | |
295 | ||
296 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) | |
297 | device_remove_file(dev, &config_rom_attributes[i].attr); | |
298 | } | |
299 | ||
300 | static int | |
301 | add_config_rom_attributes(struct device *dev) | |
302 | { | |
303 | struct device_attribute *attr; | |
304 | int i, err = 0; | |
305 | ||
306 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
307 | attr = &config_rom_attributes[i].attr; | |
308 | if (attr->show(dev, attr, NULL) < 0) | |
309 | continue; | |
310 | err = device_create_file(dev, attr); | |
311 | if (err < 0) { | |
312 | remove_config_rom_attributes(dev); | |
313 | break; | |
314 | } | |
315 | } | |
316 | ||
317 | return err; | |
318 | } | |
319 | ||
19a15b93 | 320 | static ssize_t |
21351dbe KH |
321 | modalias_show(struct device *dev, |
322 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
323 | { |
324 | struct fw_unit *unit = fw_unit(dev); | |
325 | int length; | |
326 | ||
327 | length = get_modalias(unit, buf, PAGE_SIZE); | |
328 | strcpy(buf + length, "\n"); | |
329 | ||
330 | return length + 1; | |
331 | } | |
332 | ||
19a15b93 | 333 | static ssize_t |
21351dbe KH |
334 | rom_index_show(struct device *dev, |
335 | struct device_attribute *attr, char *buf) | |
19a15b93 | 336 | { |
21351dbe KH |
337 | struct fw_device *device = fw_device(dev->parent); |
338 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 339 | |
21351dbe KH |
340 | return snprintf(buf, PAGE_SIZE, "%d\n", |
341 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
342 | } |
343 | ||
21351dbe KH |
344 | static struct device_attribute fw_unit_attributes[] = { |
345 | __ATTR_RO(modalias), | |
346 | __ATTR_RO(rom_index), | |
347 | __ATTR_NULL, | |
19a15b93 KH |
348 | }; |
349 | ||
048961ef | 350 | static ssize_t |
bbd14945 | 351 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 352 | { |
21351dbe | 353 | struct fw_device *device = fw_device(dev); |
048961ef | 354 | |
21351dbe KH |
355 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
356 | ||
357 | return device->config_rom_length * 4; | |
048961ef KH |
358 | } |
359 | ||
bbd14945 KH |
360 | static ssize_t |
361 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
362 | { | |
363 | struct fw_device *device = fw_device(dev); | |
364 | u64 guid; | |
365 | ||
366 | guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4]; | |
367 | ||
368 | return snprintf(buf, PAGE_SIZE, "0x%016llx\n", guid); | |
369 | } | |
370 | ||
21351dbe KH |
371 | static struct device_attribute fw_device_attributes[] = { |
372 | __ATTR_RO(config_rom), | |
bbd14945 | 373 | __ATTR_RO(guid), |
21351dbe | 374 | __ATTR_NULL, |
048961ef KH |
375 | }; |
376 | ||
19a15b93 KH |
377 | struct read_quadlet_callback_data { |
378 | struct completion done; | |
379 | int rcode; | |
380 | u32 data; | |
381 | }; | |
382 | ||
383 | static void | |
384 | complete_transaction(struct fw_card *card, int rcode, | |
385 | void *payload, size_t length, void *data) | |
386 | { | |
387 | struct read_quadlet_callback_data *callback_data = data; | |
388 | ||
389 | if (rcode == RCODE_COMPLETE) | |
390 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
391 | callback_data->rcode = rcode; | |
392 | complete(&callback_data->done); | |
393 | } | |
394 | ||
395 | static int read_rom(struct fw_device *device, int index, u32 * data) | |
396 | { | |
397 | struct read_quadlet_callback_data callback_data; | |
398 | struct fw_transaction t; | |
399 | u64 offset; | |
400 | ||
401 | init_completion(&callback_data.done); | |
402 | ||
403 | offset = 0xfffff0000400ULL + index * 4; | |
404 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, | |
907293d7 | 405 | device->node_id, |
19a15b93 KH |
406 | device->generation, SCODE_100, |
407 | offset, NULL, 4, complete_transaction, &callback_data); | |
408 | ||
409 | wait_for_completion(&callback_data.done); | |
410 | ||
411 | *data = callback_data.data; | |
412 | ||
413 | return callback_data.rcode; | |
414 | } | |
415 | ||
416 | static int read_bus_info_block(struct fw_device *device) | |
417 | { | |
418 | static u32 rom[256]; | |
419 | u32 stack[16], sp, key; | |
420 | int i, end, length; | |
421 | ||
422 | /* First read the bus info block. */ | |
423 | for (i = 0; i < 5; i++) { | |
424 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
425 | return -1; | |
426 | /* As per IEEE1212 7.2, during power-up, devices can | |
427 | * reply with a 0 for the first quadlet of the config | |
428 | * rom to indicate that they are booting (for example, | |
429 | * if the firmware is on the disk of a external | |
430 | * harddisk). In that case we just fail, and the | |
431 | * retry mechanism will try again later. */ | |
432 | if (i == 0 && rom[i] == 0) | |
433 | return -1; | |
434 | } | |
435 | ||
436 | /* Now parse the config rom. The config rom is a recursive | |
437 | * directory structure so we parse it using a stack of | |
438 | * references to the blocks that make up the structure. We | |
439 | * push a reference to the root directory on the stack to | |
440 | * start things off. */ | |
441 | length = i; | |
442 | sp = 0; | |
443 | stack[sp++] = 0xc0000005; | |
444 | while (sp > 0) { | |
445 | /* Pop the next block reference of the stack. The | |
446 | * lower 24 bits is the offset into the config rom, | |
447 | * the upper 8 bits are the type of the reference the | |
448 | * block. */ | |
449 | key = stack[--sp]; | |
450 | i = key & 0xffffff; | |
451 | if (i >= ARRAY_SIZE(rom)) | |
452 | /* The reference points outside the standard | |
453 | * config rom area, something's fishy. */ | |
454 | return -1; | |
455 | ||
456 | /* Read header quadlet for the block to get the length. */ | |
457 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
458 | return -1; | |
459 | end = i + (rom[i] >> 16) + 1; | |
460 | i++; | |
461 | if (end > ARRAY_SIZE(rom)) | |
462 | /* This block extends outside standard config | |
463 | * area (and the array we're reading it | |
464 | * into). That's broken, so ignore this | |
465 | * device. */ | |
466 | return -1; | |
467 | ||
468 | /* Now read in the block. If this is a directory | |
469 | * block, check the entries as we read them to see if | |
470 | * it references another block, and push it in that case. */ | |
471 | while (i < end) { | |
472 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
473 | return -1; | |
474 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && | |
475 | sp < ARRAY_SIZE(stack)) | |
476 | stack[sp++] = i + rom[i]; | |
477 | i++; | |
478 | } | |
479 | if (length < i) | |
480 | length = i; | |
481 | } | |
482 | ||
483 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); | |
484 | if (device->config_rom == NULL) | |
485 | return -1; | |
486 | memcpy(device->config_rom, rom, length * 4); | |
487 | device->config_rom_length = length; | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static void fw_unit_release(struct device *dev) | |
493 | { | |
494 | struct fw_unit *unit = fw_unit(dev); | |
495 | ||
496 | kfree(unit); | |
497 | } | |
498 | ||
21351dbe KH |
499 | static struct device_type fw_unit_type = { |
500 | .attrs = fw_unit_attributes, | |
501 | .uevent = fw_unit_uevent, | |
502 | .release = fw_unit_release, | |
503 | }; | |
504 | ||
19a15b93 KH |
505 | static int is_fw_unit(struct device *dev) |
506 | { | |
21351dbe | 507 | return dev->type == &fw_unit_type; |
19a15b93 KH |
508 | } |
509 | ||
510 | static void create_units(struct fw_device *device) | |
511 | { | |
512 | struct fw_csr_iterator ci; | |
513 | struct fw_unit *unit; | |
514 | int key, value, i; | |
515 | ||
516 | i = 0; | |
517 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
518 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
519 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
520 | continue; | |
521 | ||
522 | /* Get the address of the unit directory and try to | |
523 | * match the drivers id_tables against it. */ | |
524 | unit = kzalloc(sizeof *unit, GFP_KERNEL); | |
525 | if (unit == NULL) { | |
526 | fw_error("failed to allocate memory for unit\n"); | |
527 | continue; | |
528 | } | |
529 | ||
530 | unit->directory = ci.p + value - 1; | |
531 | unit->device.bus = &fw_bus_type; | |
21351dbe | 532 | unit->device.type = &fw_unit_type; |
19a15b93 KH |
533 | unit->device.parent = &device->device; |
534 | snprintf(unit->device.bus_id, sizeof unit->device.bus_id, | |
535 | "%s.%d", device->device.bus_id, i++); | |
536 | ||
7feb9cce KH |
537 | if (device_register(&unit->device) < 0) |
538 | goto skip_unit; | |
539 | ||
540 | if (add_config_rom_attributes(&unit->device) < 0) | |
541 | goto skip_unregister; | |
542 | ||
543 | continue; | |
544 | ||
545 | skip_unregister: | |
546 | device_unregister(&unit->device); | |
547 | skip_unit: | |
548 | kfree(unit); | |
19a15b93 KH |
549 | } |
550 | } | |
551 | ||
552 | static int shutdown_unit(struct device *device, void *data) | |
553 | { | |
7feb9cce KH |
554 | struct fw_unit *unit = fw_unit(device); |
555 | ||
556 | remove_config_rom_attributes(&unit->device); | |
21351dbe | 557 | device_unregister(device); |
19a15b93 KH |
558 | |
559 | return 0; | |
560 | } | |
561 | ||
a3aca3da KH |
562 | static DEFINE_IDR(fw_device_idr); |
563 | int fw_cdev_major; | |
564 | ||
565 | struct fw_device *fw_device_from_devt(dev_t devt) | |
566 | { | |
567 | struct fw_device *device; | |
568 | ||
569 | down_read(&fw_bus_type.subsys.rwsem); | |
570 | device = idr_find(&fw_device_idr, MINOR(devt)); | |
571 | up_read(&fw_bus_type.subsys.rwsem); | |
572 | ||
573 | return device; | |
574 | } | |
575 | ||
19a15b93 KH |
576 | static void fw_device_shutdown(struct work_struct *work) |
577 | { | |
578 | struct fw_device *device = | |
579 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
580 | int minor = MINOR(device->device.devt); |
581 | ||
582 | down_write(&fw_bus_type.subsys.rwsem); | |
583 | idr_remove(&fw_device_idr, minor); | |
584 | up_write(&fw_bus_type.subsys.rwsem); | |
19a15b93 | 585 | |
7feb9cce KH |
586 | remove_config_rom_attributes(&device->device); |
587 | ||
2603bf21 | 588 | fw_device_cdev_remove(device); |
19a15b93 KH |
589 | device_for_each_child(&device->device, NULL, shutdown_unit); |
590 | device_unregister(&device->device); | |
591 | } | |
592 | ||
21351dbe KH |
593 | static struct device_type fw_device_type = { |
594 | .attrs = fw_device_attributes, | |
595 | .release = fw_device_release, | |
596 | }; | |
597 | ||
19a15b93 KH |
598 | /* These defines control the retry behavior for reading the config |
599 | * rom. It shouldn't be necessary to tweak these; if the device | |
600 | * doesn't respond to a config rom read within 10 seconds, it's not | |
601 | * going to respond at all. As for the initial delay, a lot of | |
602 | * devices will be able to respond within half a second after bus | |
603 | * reset. On the other hand, it's not really worth being more | |
604 | * aggressive than that, since it scales pretty well; if 10 devices | |
605 | * are plugged in, they're all getting read within one second. */ | |
606 | ||
607 | #define MAX_RETRIES 5 | |
608 | #define RETRY_DELAY (2 * HZ) | |
609 | #define INITIAL_DELAY (HZ / 2) | |
610 | ||
611 | static void fw_device_init(struct work_struct *work) | |
612 | { | |
19a15b93 KH |
613 | struct fw_device *device = |
614 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 615 | int minor, err; |
19a15b93 KH |
616 | |
617 | /* All failure paths here set node->data to NULL, so that we | |
618 | * don't try to do device_for_each_child() on a kfree()'d | |
619 | * device. */ | |
620 | ||
621 | if (read_bus_info_block(device) < 0) { | |
622 | if (device->config_rom_retries < MAX_RETRIES) { | |
623 | device->config_rom_retries++; | |
624 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
625 | } else { | |
907293d7 | 626 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 627 | device->node_id); |
931c4834 KH |
628 | if (device->node == device->card->root_node) |
629 | schedule_delayed_work(&device->card->work, 0); | |
19a15b93 KH |
630 | fw_device_release(&device->device); |
631 | } | |
632 | return; | |
633 | } | |
634 | ||
a3aca3da KH |
635 | err = -ENOMEM; |
636 | down_write(&fw_bus_type.subsys.rwsem); | |
637 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) | |
638 | err = idr_get_new(&fw_device_idr, device, &minor); | |
639 | up_write(&fw_bus_type.subsys.rwsem); | |
640 | if (err < 0) | |
641 | goto error; | |
642 | ||
19a15b93 | 643 | device->device.bus = &fw_bus_type; |
21351dbe | 644 | device->device.type = &fw_device_type; |
19a15b93 | 645 | device->device.parent = device->card->device; |
a3aca3da | 646 | device->device.devt = MKDEV(fw_cdev_major, minor); |
19a15b93 | 647 | snprintf(device->device.bus_id, sizeof device->device.bus_id, |
a3aca3da | 648 | "fw%d", minor); |
19a15b93 KH |
649 | |
650 | if (device_add(&device->device)) { | |
651 | fw_error("Failed to add device.\n"); | |
a3aca3da | 652 | goto error_with_cdev; |
19a15b93 KH |
653 | } |
654 | ||
7feb9cce KH |
655 | err = add_config_rom_attributes(&device->device); |
656 | if (err < 0) | |
657 | goto error_with_register; | |
658 | ||
19a15b93 KH |
659 | create_units(device); |
660 | ||
661 | /* Transition the device to running state. If it got pulled | |
662 | * out from under us while we did the intialization work, we | |
663 | * have to shut down the device again here. Normally, though, | |
664 | * fw_node_event will be responsible for shutting it down when | |
665 | * necessary. We have to use the atomic cmpxchg here to avoid | |
666 | * racing with the FW_NODE_DESTROYED case in | |
667 | * fw_node_event(). */ | |
641f8791 | 668 | if (atomic_cmpxchg(&device->state, |
19a15b93 KH |
669 | FW_DEVICE_INITIALIZING, |
670 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
671 | fw_device_shutdown(&device->work.work); | |
672 | else | |
673 | fw_notify("created new fw device %s (%d config rom retries)\n", | |
674 | device->device.bus_id, device->config_rom_retries); | |
675 | ||
676 | /* Reschedule the IRM work if we just finished reading the | |
677 | * root node config rom. If this races with a bus reset we | |
678 | * just end up running the IRM work a couple of extra times - | |
679 | * pretty harmless. */ | |
680 | if (device->node == device->card->root_node) | |
681 | schedule_delayed_work(&device->card->work, 0); | |
682 | ||
683 | return; | |
684 | ||
7feb9cce KH |
685 | error_with_register: |
686 | device_unregister(&device->device); | |
a3aca3da KH |
687 | error_with_cdev: |
688 | down_write(&fw_bus_type.subsys.rwsem); | |
689 | idr_remove(&fw_device_idr, minor); | |
690 | up_write(&fw_bus_type.subsys.rwsem); | |
373b2edd | 691 | error: |
19a15b93 KH |
692 | put_device(&device->device); |
693 | } | |
694 | ||
695 | static int update_unit(struct device *dev, void *data) | |
696 | { | |
697 | struct fw_unit *unit = fw_unit(dev); | |
698 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
699 | ||
015b066f KH |
700 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
701 | down(&dev->sem); | |
19a15b93 | 702 | driver->update(unit); |
015b066f KH |
703 | up(&dev->sem); |
704 | } | |
19a15b93 KH |
705 | |
706 | return 0; | |
707 | } | |
708 | ||
5f480477 KH |
709 | static void fw_device_update(struct work_struct *work) |
710 | { | |
711 | struct fw_device *device = | |
712 | container_of(work, struct fw_device, work.work); | |
713 | ||
97bd9efa | 714 | fw_device_cdev_update(device); |
5f480477 KH |
715 | device_for_each_child(&device->device, NULL, update_unit); |
716 | } | |
717 | ||
19a15b93 KH |
718 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
719 | { | |
720 | struct fw_device *device; | |
721 | ||
19a15b93 KH |
722 | switch (event) { |
723 | case FW_NODE_CREATED: | |
724 | case FW_NODE_LINK_ON: | |
725 | if (!node->link_on) | |
726 | break; | |
727 | ||
728 | device = kzalloc(sizeof(*device), GFP_ATOMIC); | |
729 | if (device == NULL) | |
730 | break; | |
731 | ||
732 | /* Do minimal intialization of the device here, the | |
733 | * rest will happen in fw_device_init(). We need the | |
734 | * card and node so we can read the config rom and we | |
735 | * need to do device_initialize() now so | |
736 | * device_for_each_child() in FW_NODE_UPDATED is | |
737 | * doesn't freak out. */ | |
738 | device_initialize(&device->device); | |
641f8791 | 739 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
19a15b93 KH |
740 | device->card = fw_card_get(card); |
741 | device->node = fw_node_get(node); | |
742 | device->node_id = node->node_id; | |
743 | device->generation = card->generation; | |
97bd9efa | 744 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 KH |
745 | |
746 | /* Set the node data to point back to this device so | |
747 | * FW_NODE_UPDATED callbacks can update the node_id | |
748 | * and generation for the device. */ | |
749 | node->data = device; | |
750 | ||
751 | /* Many devices are slow to respond after bus resets, | |
752 | * especially if they are bus powered and go through | |
753 | * power-up after getting plugged in. We schedule the | |
754 | * first config rom scan half a second after bus reset. */ | |
755 | INIT_DELAYED_WORK(&device->work, fw_device_init); | |
756 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
757 | break; | |
758 | ||
759 | case FW_NODE_UPDATED: | |
760 | if (!node->link_on || node->data == NULL) | |
761 | break; | |
762 | ||
763 | device = node->data; | |
764 | device->node_id = node->node_id; | |
765 | device->generation = card->generation; | |
5f480477 KH |
766 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
767 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
768 | schedule_delayed_work(&device->work, 0); | |
769 | } | |
19a15b93 KH |
770 | break; |
771 | ||
772 | case FW_NODE_DESTROYED: | |
773 | case FW_NODE_LINK_OFF: | |
774 | if (!node->data) | |
775 | break; | |
776 | ||
777 | /* Destroy the device associated with the node. There | |
778 | * are two cases here: either the device is fully | |
779 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
780 | * process of reading its config rom | |
781 | * (FW_DEVICE_INITIALIZING). If it is fully | |
782 | * initialized we can reuse device->work to schedule a | |
783 | * full fw_device_shutdown(). If not, there's work | |
784 | * scheduled to read it's config rom, and we just put | |
785 | * the device in shutdown state to have that code fail | |
786 | * to create the device. */ | |
787 | device = node->data; | |
641f8791 | 788 | if (atomic_xchg(&device->state, |
5f480477 KH |
789 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
790 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
791 | schedule_delayed_work(&device->work, 0); |
792 | } | |
793 | break; | |
794 | } | |
795 | } |