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