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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 |
21351dbe KH |
351 | config_rom_show(struct device *dev, |
352 | struct device_attribute *attr, char *buf) | |
048961ef | 353 | { |
21351dbe | 354 | struct fw_device *device = fw_device(dev); |
048961ef | 355 | |
21351dbe KH |
356 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
357 | ||
358 | return device->config_rom_length * 4; | |
048961ef KH |
359 | } |
360 | ||
21351dbe KH |
361 | static struct device_attribute fw_device_attributes[] = { |
362 | __ATTR_RO(config_rom), | |
363 | __ATTR_NULL, | |
048961ef KH |
364 | }; |
365 | ||
19a15b93 KH |
366 | struct read_quadlet_callback_data { |
367 | struct completion done; | |
368 | int rcode; | |
369 | u32 data; | |
370 | }; | |
371 | ||
372 | static void | |
373 | complete_transaction(struct fw_card *card, int rcode, | |
374 | void *payload, size_t length, void *data) | |
375 | { | |
376 | struct read_quadlet_callback_data *callback_data = data; | |
377 | ||
378 | if (rcode == RCODE_COMPLETE) | |
379 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
380 | callback_data->rcode = rcode; | |
381 | complete(&callback_data->done); | |
382 | } | |
383 | ||
384 | static int read_rom(struct fw_device *device, int index, u32 * data) | |
385 | { | |
386 | struct read_quadlet_callback_data callback_data; | |
387 | struct fw_transaction t; | |
388 | u64 offset; | |
389 | ||
390 | init_completion(&callback_data.done); | |
391 | ||
392 | offset = 0xfffff0000400ULL + index * 4; | |
393 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, | |
907293d7 | 394 | device->node_id, |
19a15b93 KH |
395 | device->generation, SCODE_100, |
396 | offset, NULL, 4, complete_transaction, &callback_data); | |
397 | ||
398 | wait_for_completion(&callback_data.done); | |
399 | ||
400 | *data = callback_data.data; | |
401 | ||
402 | return callback_data.rcode; | |
403 | } | |
404 | ||
405 | static int read_bus_info_block(struct fw_device *device) | |
406 | { | |
407 | static u32 rom[256]; | |
408 | u32 stack[16], sp, key; | |
409 | int i, end, length; | |
410 | ||
411 | /* First read the bus info block. */ | |
412 | for (i = 0; i < 5; i++) { | |
413 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
414 | return -1; | |
415 | /* As per IEEE1212 7.2, during power-up, devices can | |
416 | * reply with a 0 for the first quadlet of the config | |
417 | * rom to indicate that they are booting (for example, | |
418 | * if the firmware is on the disk of a external | |
419 | * harddisk). In that case we just fail, and the | |
420 | * retry mechanism will try again later. */ | |
421 | if (i == 0 && rom[i] == 0) | |
422 | return -1; | |
423 | } | |
424 | ||
425 | /* Now parse the config rom. The config rom is a recursive | |
426 | * directory structure so we parse it using a stack of | |
427 | * references to the blocks that make up the structure. We | |
428 | * push a reference to the root directory on the stack to | |
429 | * start things off. */ | |
430 | length = i; | |
431 | sp = 0; | |
432 | stack[sp++] = 0xc0000005; | |
433 | while (sp > 0) { | |
434 | /* Pop the next block reference of the stack. The | |
435 | * lower 24 bits is the offset into the config rom, | |
436 | * the upper 8 bits are the type of the reference the | |
437 | * block. */ | |
438 | key = stack[--sp]; | |
439 | i = key & 0xffffff; | |
440 | if (i >= ARRAY_SIZE(rom)) | |
441 | /* The reference points outside the standard | |
442 | * config rom area, something's fishy. */ | |
443 | return -1; | |
444 | ||
445 | /* Read header quadlet for the block to get the length. */ | |
446 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
447 | return -1; | |
448 | end = i + (rom[i] >> 16) + 1; | |
449 | i++; | |
450 | if (end > ARRAY_SIZE(rom)) | |
451 | /* This block extends outside standard config | |
452 | * area (and the array we're reading it | |
453 | * into). That's broken, so ignore this | |
454 | * device. */ | |
455 | return -1; | |
456 | ||
457 | /* Now read in the block. If this is a directory | |
458 | * block, check the entries as we read them to see if | |
459 | * it references another block, and push it in that case. */ | |
460 | while (i < end) { | |
461 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
462 | return -1; | |
463 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && | |
464 | sp < ARRAY_SIZE(stack)) | |
465 | stack[sp++] = i + rom[i]; | |
466 | i++; | |
467 | } | |
468 | if (length < i) | |
469 | length = i; | |
470 | } | |
471 | ||
472 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); | |
473 | if (device->config_rom == NULL) | |
474 | return -1; | |
475 | memcpy(device->config_rom, rom, length * 4); | |
476 | device->config_rom_length = length; | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | static void fw_unit_release(struct device *dev) | |
482 | { | |
483 | struct fw_unit *unit = fw_unit(dev); | |
484 | ||
485 | kfree(unit); | |
486 | } | |
487 | ||
21351dbe KH |
488 | static struct device_type fw_unit_type = { |
489 | .attrs = fw_unit_attributes, | |
490 | .uevent = fw_unit_uevent, | |
491 | .release = fw_unit_release, | |
492 | }; | |
493 | ||
19a15b93 KH |
494 | static int is_fw_unit(struct device *dev) |
495 | { | |
21351dbe | 496 | return dev->type == &fw_unit_type; |
19a15b93 KH |
497 | } |
498 | ||
499 | static void create_units(struct fw_device *device) | |
500 | { | |
501 | struct fw_csr_iterator ci; | |
502 | struct fw_unit *unit; | |
503 | int key, value, i; | |
504 | ||
505 | i = 0; | |
506 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
507 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
508 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
509 | continue; | |
510 | ||
511 | /* Get the address of the unit directory and try to | |
512 | * match the drivers id_tables against it. */ | |
513 | unit = kzalloc(sizeof *unit, GFP_KERNEL); | |
514 | if (unit == NULL) { | |
515 | fw_error("failed to allocate memory for unit\n"); | |
516 | continue; | |
517 | } | |
518 | ||
519 | unit->directory = ci.p + value - 1; | |
520 | unit->device.bus = &fw_bus_type; | |
21351dbe | 521 | unit->device.type = &fw_unit_type; |
19a15b93 KH |
522 | unit->device.parent = &device->device; |
523 | snprintf(unit->device.bus_id, sizeof unit->device.bus_id, | |
524 | "%s.%d", device->device.bus_id, i++); | |
525 | ||
7feb9cce KH |
526 | if (device_register(&unit->device) < 0) |
527 | goto skip_unit; | |
528 | ||
529 | if (add_config_rom_attributes(&unit->device) < 0) | |
530 | goto skip_unregister; | |
531 | ||
532 | continue; | |
533 | ||
534 | skip_unregister: | |
535 | device_unregister(&unit->device); | |
536 | skip_unit: | |
537 | kfree(unit); | |
19a15b93 KH |
538 | } |
539 | } | |
540 | ||
541 | static int shutdown_unit(struct device *device, void *data) | |
542 | { | |
7feb9cce KH |
543 | struct fw_unit *unit = fw_unit(device); |
544 | ||
545 | remove_config_rom_attributes(&unit->device); | |
21351dbe | 546 | device_unregister(device); |
19a15b93 KH |
547 | |
548 | return 0; | |
549 | } | |
550 | ||
a3aca3da KH |
551 | static DEFINE_IDR(fw_device_idr); |
552 | int fw_cdev_major; | |
553 | ||
554 | struct fw_device *fw_device_from_devt(dev_t devt) | |
555 | { | |
556 | struct fw_device *device; | |
557 | ||
558 | down_read(&fw_bus_type.subsys.rwsem); | |
559 | device = idr_find(&fw_device_idr, MINOR(devt)); | |
560 | up_read(&fw_bus_type.subsys.rwsem); | |
561 | ||
562 | return device; | |
563 | } | |
564 | ||
19a15b93 KH |
565 | static void fw_device_shutdown(struct work_struct *work) |
566 | { | |
567 | struct fw_device *device = | |
568 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
569 | int minor = MINOR(device->device.devt); |
570 | ||
571 | down_write(&fw_bus_type.subsys.rwsem); | |
572 | idr_remove(&fw_device_idr, minor); | |
573 | up_write(&fw_bus_type.subsys.rwsem); | |
19a15b93 | 574 | |
7feb9cce KH |
575 | remove_config_rom_attributes(&device->device); |
576 | ||
2603bf21 | 577 | fw_device_cdev_remove(device); |
19a15b93 KH |
578 | device_for_each_child(&device->device, NULL, shutdown_unit); |
579 | device_unregister(&device->device); | |
580 | } | |
581 | ||
21351dbe KH |
582 | static struct device_type fw_device_type = { |
583 | .attrs = fw_device_attributes, | |
584 | .release = fw_device_release, | |
585 | }; | |
586 | ||
19a15b93 KH |
587 | /* These defines control the retry behavior for reading the config |
588 | * rom. It shouldn't be necessary to tweak these; if the device | |
589 | * doesn't respond to a config rom read within 10 seconds, it's not | |
590 | * going to respond at all. As for the initial delay, a lot of | |
591 | * devices will be able to respond within half a second after bus | |
592 | * reset. On the other hand, it's not really worth being more | |
593 | * aggressive than that, since it scales pretty well; if 10 devices | |
594 | * are plugged in, they're all getting read within one second. */ | |
595 | ||
596 | #define MAX_RETRIES 5 | |
597 | #define RETRY_DELAY (2 * HZ) | |
598 | #define INITIAL_DELAY (HZ / 2) | |
599 | ||
600 | static void fw_device_init(struct work_struct *work) | |
601 | { | |
19a15b93 KH |
602 | struct fw_device *device = |
603 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 604 | int minor, err; |
19a15b93 KH |
605 | |
606 | /* All failure paths here set node->data to NULL, so that we | |
607 | * don't try to do device_for_each_child() on a kfree()'d | |
608 | * device. */ | |
609 | ||
610 | if (read_bus_info_block(device) < 0) { | |
611 | if (device->config_rom_retries < MAX_RETRIES) { | |
612 | device->config_rom_retries++; | |
613 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
614 | } else { | |
907293d7 | 615 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 616 | device->node_id); |
931c4834 KH |
617 | if (device->node == device->card->root_node) |
618 | schedule_delayed_work(&device->card->work, 0); | |
19a15b93 KH |
619 | fw_device_release(&device->device); |
620 | } | |
621 | return; | |
622 | } | |
623 | ||
a3aca3da KH |
624 | err = -ENOMEM; |
625 | down_write(&fw_bus_type.subsys.rwsem); | |
626 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) | |
627 | err = idr_get_new(&fw_device_idr, device, &minor); | |
628 | up_write(&fw_bus_type.subsys.rwsem); | |
629 | if (err < 0) | |
630 | goto error; | |
631 | ||
19a15b93 | 632 | device->device.bus = &fw_bus_type; |
21351dbe | 633 | device->device.type = &fw_device_type; |
19a15b93 | 634 | device->device.parent = device->card->device; |
a3aca3da | 635 | device->device.devt = MKDEV(fw_cdev_major, minor); |
19a15b93 | 636 | snprintf(device->device.bus_id, sizeof device->device.bus_id, |
a3aca3da | 637 | "fw%d", minor); |
19a15b93 KH |
638 | |
639 | if (device_add(&device->device)) { | |
640 | fw_error("Failed to add device.\n"); | |
a3aca3da | 641 | goto error_with_cdev; |
19a15b93 KH |
642 | } |
643 | ||
7feb9cce KH |
644 | err = add_config_rom_attributes(&device->device); |
645 | if (err < 0) | |
646 | goto error_with_register; | |
647 | ||
19a15b93 KH |
648 | create_units(device); |
649 | ||
650 | /* Transition the device to running state. If it got pulled | |
651 | * out from under us while we did the intialization work, we | |
652 | * have to shut down the device again here. Normally, though, | |
653 | * fw_node_event will be responsible for shutting it down when | |
654 | * necessary. We have to use the atomic cmpxchg here to avoid | |
655 | * racing with the FW_NODE_DESTROYED case in | |
656 | * fw_node_event(). */ | |
641f8791 | 657 | if (atomic_cmpxchg(&device->state, |
19a15b93 KH |
658 | FW_DEVICE_INITIALIZING, |
659 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
660 | fw_device_shutdown(&device->work.work); | |
661 | else | |
662 | fw_notify("created new fw device %s (%d config rom retries)\n", | |
663 | device->device.bus_id, device->config_rom_retries); | |
664 | ||
665 | /* Reschedule the IRM work if we just finished reading the | |
666 | * root node config rom. If this races with a bus reset we | |
667 | * just end up running the IRM work a couple of extra times - | |
668 | * pretty harmless. */ | |
669 | if (device->node == device->card->root_node) | |
670 | schedule_delayed_work(&device->card->work, 0); | |
671 | ||
672 | return; | |
673 | ||
7feb9cce KH |
674 | error_with_register: |
675 | device_unregister(&device->device); | |
a3aca3da KH |
676 | error_with_cdev: |
677 | down_write(&fw_bus_type.subsys.rwsem); | |
678 | idr_remove(&fw_device_idr, minor); | |
679 | up_write(&fw_bus_type.subsys.rwsem); | |
373b2edd | 680 | error: |
19a15b93 KH |
681 | put_device(&device->device); |
682 | } | |
683 | ||
684 | static int update_unit(struct device *dev, void *data) | |
685 | { | |
686 | struct fw_unit *unit = fw_unit(dev); | |
687 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
688 | ||
015b066f KH |
689 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
690 | down(&dev->sem); | |
19a15b93 | 691 | driver->update(unit); |
015b066f KH |
692 | up(&dev->sem); |
693 | } | |
19a15b93 KH |
694 | |
695 | return 0; | |
696 | } | |
697 | ||
5f480477 KH |
698 | static void fw_device_update(struct work_struct *work) |
699 | { | |
700 | struct fw_device *device = | |
701 | container_of(work, struct fw_device, work.work); | |
702 | ||
97bd9efa | 703 | fw_device_cdev_update(device); |
5f480477 KH |
704 | device_for_each_child(&device->device, NULL, update_unit); |
705 | } | |
706 | ||
19a15b93 KH |
707 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
708 | { | |
709 | struct fw_device *device; | |
710 | ||
19a15b93 KH |
711 | switch (event) { |
712 | case FW_NODE_CREATED: | |
713 | case FW_NODE_LINK_ON: | |
714 | if (!node->link_on) | |
715 | break; | |
716 | ||
717 | device = kzalloc(sizeof(*device), GFP_ATOMIC); | |
718 | if (device == NULL) | |
719 | break; | |
720 | ||
721 | /* Do minimal intialization of the device here, the | |
722 | * rest will happen in fw_device_init(). We need the | |
723 | * card and node so we can read the config rom and we | |
724 | * need to do device_initialize() now so | |
725 | * device_for_each_child() in FW_NODE_UPDATED is | |
726 | * doesn't freak out. */ | |
727 | device_initialize(&device->device); | |
641f8791 | 728 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
19a15b93 KH |
729 | device->card = fw_card_get(card); |
730 | device->node = fw_node_get(node); | |
731 | device->node_id = node->node_id; | |
732 | device->generation = card->generation; | |
97bd9efa | 733 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 KH |
734 | |
735 | /* Set the node data to point back to this device so | |
736 | * FW_NODE_UPDATED callbacks can update the node_id | |
737 | * and generation for the device. */ | |
738 | node->data = device; | |
739 | ||
740 | /* Many devices are slow to respond after bus resets, | |
741 | * especially if they are bus powered and go through | |
742 | * power-up after getting plugged in. We schedule the | |
743 | * first config rom scan half a second after bus reset. */ | |
744 | INIT_DELAYED_WORK(&device->work, fw_device_init); | |
745 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
746 | break; | |
747 | ||
748 | case FW_NODE_UPDATED: | |
749 | if (!node->link_on || node->data == NULL) | |
750 | break; | |
751 | ||
752 | device = node->data; | |
753 | device->node_id = node->node_id; | |
754 | device->generation = card->generation; | |
5f480477 KH |
755 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
756 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
757 | schedule_delayed_work(&device->work, 0); | |
758 | } | |
19a15b93 KH |
759 | break; |
760 | ||
761 | case FW_NODE_DESTROYED: | |
762 | case FW_NODE_LINK_OFF: | |
763 | if (!node->data) | |
764 | break; | |
765 | ||
766 | /* Destroy the device associated with the node. There | |
767 | * are two cases here: either the device is fully | |
768 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
769 | * process of reading its config rom | |
770 | * (FW_DEVICE_INITIALIZING). If it is fully | |
771 | * initialized we can reuse device->work to schedule a | |
772 | * full fw_device_shutdown(). If not, there's work | |
773 | * scheduled to read it's config rom, and we just put | |
774 | * the device in shutdown state to have that code fail | |
775 | * to create the device. */ | |
776 | device = node->data; | |
641f8791 | 777 | if (atomic_xchg(&device->state, |
5f480477 KH |
778 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
779 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
780 | schedule_delayed_work(&device->work, 0); |
781 | } | |
782 | break; | |
783 | } | |
784 | } |