| 1 | /* |
| 2 | * Device probing and sysfs code. |
| 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> |
| 27 | #include <linux/idr.h> |
| 28 | #include <linux/rwsem.h> |
| 29 | #include <asm/semaphore.h> |
| 30 | #include <linux/ctype.h> |
| 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 | } |
| 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 | } |
| 49 | EXPORT_SYMBOL(fw_csr_iterator_next); |
| 50 | |
| 51 | static int is_fw_unit(struct device *dev); |
| 52 | |
| 53 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
| 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, struct kobj_uevent_env *env) |
| 134 | { |
| 135 | struct fw_unit *unit = fw_unit(dev); |
| 136 | char modalias[64]; |
| 137 | |
| 138 | get_modalias(unit, modalias, sizeof(modalias)); |
| 139 | |
| 140 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
| 141 | return -ENOMEM; |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | struct bus_type fw_bus_type = { |
| 147 | .name = "firewire", |
| 148 | .match = fw_unit_match, |
| 149 | }; |
| 150 | EXPORT_SYMBOL(fw_bus_type); |
| 151 | |
| 152 | struct fw_device *fw_device_get(struct fw_device *device) |
| 153 | { |
| 154 | get_device(&device->device); |
| 155 | |
| 156 | return device; |
| 157 | } |
| 158 | |
| 159 | void fw_device_put(struct fw_device *device) |
| 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 | |
| 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 | */ |
| 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 | } |
| 189 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
| 190 | |
| 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 |
| 286 | init_fw_attribute_group(struct device *dev, |
| 287 | struct device_attribute *attrs, |
| 288 | struct fw_attribute_group *group) |
| 289 | { |
| 290 | struct device_attribute *attr; |
| 291 | int i, j; |
| 292 | |
| 293 | for (j = 0; attrs[j].attr.name != NULL; j++) |
| 294 | group->attrs[j] = &attrs[j].attr; |
| 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; |
| 300 | group->attrs[j++] = &attr->attr; |
| 301 | } |
| 302 | |
| 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; |
| 309 | } |
| 310 | |
| 311 | static ssize_t |
| 312 | modalias_show(struct device *dev, |
| 313 | struct device_attribute *attr, char *buf) |
| 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 | |
| 324 | static ssize_t |
| 325 | rom_index_show(struct device *dev, |
| 326 | struct device_attribute *attr, char *buf) |
| 327 | { |
| 328 | struct fw_device *device = fw_device(dev->parent); |
| 329 | struct fw_unit *unit = fw_unit(dev); |
| 330 | |
| 331 | return snprintf(buf, PAGE_SIZE, "%d\n", |
| 332 | (int)(unit->directory - device->config_rom)); |
| 333 | } |
| 334 | |
| 335 | static struct device_attribute fw_unit_attributes[] = { |
| 336 | __ATTR_RO(modalias), |
| 337 | __ATTR_RO(rom_index), |
| 338 | __ATTR_NULL, |
| 339 | }; |
| 340 | |
| 341 | static ssize_t |
| 342 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 343 | { |
| 344 | struct fw_device *device = fw_device(dev); |
| 345 | |
| 346 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
| 347 | |
| 348 | return device->config_rom_length * 4; |
| 349 | } |
| 350 | |
| 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 | |
| 359 | return snprintf(buf, PAGE_SIZE, "0x%016llx\n", |
| 360 | (unsigned long long)guid); |
| 361 | } |
| 362 | |
| 363 | static struct device_attribute fw_device_attributes[] = { |
| 364 | __ATTR_RO(config_rom), |
| 365 | __ATTR_RO(guid), |
| 366 | __ATTR_NULL, |
| 367 | }; |
| 368 | |
| 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, |
| 397 | device->node_id, device->generation, device->max_speed, |
| 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 | |
| 413 | device->max_speed = SCODE_100; |
| 414 | |
| 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; |
| 419 | /* |
| 420 | * As per IEEE1212 7.2, during power-up, devices can |
| 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 |
| 425 | * retry mechanism will try again later. |
| 426 | */ |
| 427 | if (i == 0 && rom[i] == 0) |
| 428 | return -1; |
| 429 | } |
| 430 | |
| 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 | |
| 458 | /* |
| 459 | * Now parse the config rom. The config rom is a recursive |
| 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 |
| 463 | * start things off. |
| 464 | */ |
| 465 | length = i; |
| 466 | sp = 0; |
| 467 | stack[sp++] = 0xc0000005; |
| 468 | while (sp > 0) { |
| 469 | /* |
| 470 | * Pop the next block reference of the stack. The |
| 471 | * lower 24 bits is the offset into the config rom, |
| 472 | * the upper 8 bits are the type of the reference the |
| 473 | * block. |
| 474 | */ |
| 475 | key = stack[--sp]; |
| 476 | i = key & 0xffffff; |
| 477 | if (i >= ARRAY_SIZE(rom)) |
| 478 | /* |
| 479 | * The reference points outside the standard |
| 480 | * config rom area, something's fishy. |
| 481 | */ |
| 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)) |
| 490 | /* |
| 491 | * This block extends outside standard config |
| 492 | * area (and the array we're reading it |
| 493 | * into). That's broken, so ignore this |
| 494 | * device. |
| 495 | */ |
| 496 | return -1; |
| 497 | |
| 498 | /* |
| 499 | * Now read in the block. If this is a directory |
| 500 | * block, check the entries as we read them to see if |
| 501 | * it references another block, and push it in that case. |
| 502 | */ |
| 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 | |
| 531 | static struct device_type fw_unit_type = { |
| 532 | .uevent = fw_unit_uevent, |
| 533 | .release = fw_unit_release, |
| 534 | }; |
| 535 | |
| 536 | static int is_fw_unit(struct device *dev) |
| 537 | { |
| 538 | return dev->type == &fw_unit_type; |
| 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 | |
| 553 | /* |
| 554 | * Get the address of the unit directory and try to |
| 555 | * match the drivers id_tables against it. |
| 556 | */ |
| 557 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
| 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; |
| 565 | unit->device.type = &fw_unit_type; |
| 566 | unit->device.parent = &device->device; |
| 567 | snprintf(unit->device.bus_id, sizeof(unit->device.bus_id), |
| 568 | "%s.%d", device->device.bus_id, i++); |
| 569 | |
| 570 | init_fw_attribute_group(&unit->device, |
| 571 | fw_unit_attributes, |
| 572 | &unit->attribute_group); |
| 573 | if (device_register(&unit->device) < 0) |
| 574 | goto skip_unit; |
| 575 | |
| 576 | continue; |
| 577 | |
| 578 | skip_unit: |
| 579 | kfree(unit); |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | static int shutdown_unit(struct device *device, void *data) |
| 584 | { |
| 585 | device_unregister(device); |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | static DECLARE_RWSEM(idr_rwsem); |
| 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 | |
| 598 | down_read(&idr_rwsem); |
| 599 | device = idr_find(&fw_device_idr, MINOR(devt)); |
| 600 | up_read(&idr_rwsem); |
| 601 | |
| 602 | return device; |
| 603 | } |
| 604 | |
| 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); |
| 609 | int minor = MINOR(device->device.devt); |
| 610 | |
| 611 | down_write(&idr_rwsem); |
| 612 | idr_remove(&fw_device_idr, minor); |
| 613 | up_write(&idr_rwsem); |
| 614 | |
| 615 | fw_device_cdev_remove(device); |
| 616 | device_for_each_child(&device->device, NULL, shutdown_unit); |
| 617 | device_unregister(&device->device); |
| 618 | } |
| 619 | |
| 620 | static struct device_type fw_device_type = { |
| 621 | .release = fw_device_release, |
| 622 | }; |
| 623 | |
| 624 | /* |
| 625 | * These defines control the retry behavior for reading the config |
| 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 |
| 632 | * are plugged in, they're all getting read within one second. |
| 633 | */ |
| 634 | |
| 635 | #define MAX_RETRIES 10 |
| 636 | #define RETRY_DELAY (3 * HZ) |
| 637 | #define INITIAL_DELAY (HZ / 2) |
| 638 | |
| 639 | static void fw_device_init(struct work_struct *work) |
| 640 | { |
| 641 | struct fw_device *device = |
| 642 | container_of(work, struct fw_device, work.work); |
| 643 | int minor, err; |
| 644 | |
| 645 | /* |
| 646 | * All failure paths here set node->data to NULL, so that we |
| 647 | * don't try to do device_for_each_child() on a kfree()'d |
| 648 | * device. |
| 649 | */ |
| 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 { |
| 656 | fw_notify("giving up on config rom for node id %x\n", |
| 657 | device->node_id); |
| 658 | if (device->node == device->card->root_node) |
| 659 | schedule_delayed_work(&device->card->work, 0); |
| 660 | fw_device_release(&device->device); |
| 661 | } |
| 662 | return; |
| 663 | } |
| 664 | |
| 665 | err = -ENOMEM; |
| 666 | down_write(&idr_rwsem); |
| 667 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) |
| 668 | err = idr_get_new(&fw_device_idr, device, &minor); |
| 669 | up_write(&idr_rwsem); |
| 670 | if (err < 0) |
| 671 | goto error; |
| 672 | |
| 673 | device->device.bus = &fw_bus_type; |
| 674 | device->device.type = &fw_device_type; |
| 675 | device->device.parent = device->card->device; |
| 676 | device->device.devt = MKDEV(fw_cdev_major, minor); |
| 677 | snprintf(device->device.bus_id, sizeof(device->device.bus_id), |
| 678 | "fw%d", minor); |
| 679 | |
| 680 | init_fw_attribute_group(&device->device, |
| 681 | fw_device_attributes, |
| 682 | &device->attribute_group); |
| 683 | if (device_add(&device->device)) { |
| 684 | fw_error("Failed to add device.\n"); |
| 685 | goto error_with_cdev; |
| 686 | } |
| 687 | |
| 688 | create_units(device); |
| 689 | |
| 690 | /* |
| 691 | * Transition the device to running state. If it got pulled |
| 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 |
| 697 | * fw_node_event(). |
| 698 | */ |
| 699 | if (atomic_cmpxchg(&device->state, |
| 700 | FW_DEVICE_INITIALIZING, |
| 701 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) |
| 702 | fw_device_shutdown(&device->work.work); |
| 703 | else |
| 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); |
| 708 | |
| 709 | /* |
| 710 | * Reschedule the IRM work if we just finished reading the |
| 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 - |
| 713 | * pretty harmless. |
| 714 | */ |
| 715 | if (device->node == device->card->root_node) |
| 716 | schedule_delayed_work(&device->card->work, 0); |
| 717 | |
| 718 | return; |
| 719 | |
| 720 | error_with_cdev: |
| 721 | down_write(&idr_rwsem); |
| 722 | idr_remove(&fw_device_idr, minor); |
| 723 | up_write(&idr_rwsem); |
| 724 | error: |
| 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 | |
| 733 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
| 734 | down(&dev->sem); |
| 735 | driver->update(unit); |
| 736 | up(&dev->sem); |
| 737 | } |
| 738 | |
| 739 | return 0; |
| 740 | } |
| 741 | |
| 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 | |
| 747 | fw_device_cdev_update(device); |
| 748 | device_for_each_child(&device->device, NULL, update_unit); |
| 749 | } |
| 750 | |
| 751 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
| 752 | { |
| 753 | struct fw_device *device; |
| 754 | |
| 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 | |
| 765 | /* |
| 766 | * Do minimal intialization of the device here, the |
| 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 |
| 771 | * doesn't freak out. |
| 772 | */ |
| 773 | device_initialize(&device->device); |
| 774 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
| 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; |
| 779 | INIT_LIST_HEAD(&device->client_list); |
| 780 | |
| 781 | /* |
| 782 | * Set the node data to point back to this device so |
| 783 | * FW_NODE_UPDATED callbacks can update the node_id |
| 784 | * and generation for the device. |
| 785 | */ |
| 786 | node->data = device; |
| 787 | |
| 788 | /* |
| 789 | * Many devices are slow to respond after bus resets, |
| 790 | * especially if they are bus powered and go through |
| 791 | * power-up after getting plugged in. We schedule the |
| 792 | * first config rom scan half a second after bus reset. |
| 793 | */ |
| 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; |
| 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 | } |
| 809 | break; |
| 810 | |
| 811 | case FW_NODE_DESTROYED: |
| 812 | case FW_NODE_LINK_OFF: |
| 813 | if (!node->data) |
| 814 | break; |
| 815 | |
| 816 | /* |
| 817 | * Destroy the device associated with the node. There |
| 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 |
| 826 | * to create the device. |
| 827 | */ |
| 828 | device = node->data; |
| 829 | if (atomic_xchg(&device->state, |
| 830 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
| 831 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
| 832 | schedule_delayed_work(&device->work, 0); |
| 833 | } |
| 834 | break; |
| 835 | } |
| 836 | } |