Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Functions to handle I2O devices |
| 3 | * |
| 4 | * Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the |
| 8 | * Free Software Foundation; either version 2 of the License, or (at your |
| 9 | * option) any later version. |
| 10 | * |
| 11 | * Fixes/additions: |
| 12 | * Markus Lidel <Markus.Lidel@shadowconnect.com> |
| 13 | * initial version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/i2o.h> |
| 18 | #include <linux/delay.h> |
| 19 | |
| 20 | /* Exec OSM functions */ |
| 21 | extern struct bus_type i2o_bus_type; |
| 22 | |
| 23 | /** |
| 24 | * i2o_device_issue_claim - claim or release a device |
| 25 | * @dev: I2O device to claim or release |
| 26 | * @cmd: claim or release command |
| 27 | * @type: type of claim |
| 28 | * |
| 29 | * Issue I2O UTIL_CLAIM or UTIL_RELEASE messages. The message to be sent |
| 30 | * is set by cmd. dev is the I2O device which should be claim or |
| 31 | * released and the type is the claim type (see the I2O spec). |
| 32 | * |
| 33 | * Returs 0 on success or negative error code on failure. |
| 34 | */ |
| 35 | static inline int i2o_device_issue_claim(struct i2o_device *dev, u32 cmd, |
| 36 | u32 type) |
| 37 | { |
| 38 | struct i2o_message __iomem *msg; |
| 39 | u32 m; |
| 40 | |
| 41 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 42 | if (m == I2O_QUEUE_EMPTY) |
| 43 | return -ETIMEDOUT; |
| 44 | |
| 45 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); |
| 46 | writel(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid, &msg->u.head[1]); |
| 47 | writel(type, &msg->body[0]); |
| 48 | |
| 49 | return i2o_msg_post_wait(dev->iop, m, 60); |
| 50 | }; |
| 51 | |
| 52 | /** |
| 53 | * i2o_device_claim - claim a device for use by an OSM |
| 54 | * @dev: I2O device to claim |
| 55 | * @drv: I2O driver which wants to claim the device |
| 56 | * |
| 57 | * Do the leg work to assign a device to a given OSM. If the claim succeed |
| 58 | * the owner of the rimary. If the attempt fails a negative errno code |
| 59 | * is returned. On success zero is returned. |
| 60 | */ |
| 61 | int i2o_device_claim(struct i2o_device *dev) |
| 62 | { |
| 63 | int rc = 0; |
| 64 | |
| 65 | down(&dev->lock); |
| 66 | |
| 67 | rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY); |
| 68 | if (!rc) |
| 69 | pr_debug("i2o: claim of device %d succeded\n", |
| 70 | dev->lct_data.tid); |
| 71 | else |
| 72 | pr_debug("i2o: claim of device %d failed %d\n", |
| 73 | dev->lct_data.tid, rc); |
| 74 | |
| 75 | up(&dev->lock); |
| 76 | |
| 77 | return rc; |
| 78 | }; |
| 79 | |
| 80 | /** |
| 81 | * i2o_device_claim_release - release a device that the OSM is using |
| 82 | * @dev: device to release |
| 83 | * @drv: driver which claimed the device |
| 84 | * |
| 85 | * Drop a claim by an OSM on a given I2O device. |
| 86 | * |
| 87 | * AC - some devices seem to want to refuse an unclaim until they have |
| 88 | * finished internal processing. It makes sense since you don't want a |
| 89 | * new device to go reconfiguring the entire system until you are done. |
| 90 | * Thus we are prepared to wait briefly. |
| 91 | * |
| 92 | * Returns 0 on success or negative error code on failure. |
| 93 | */ |
| 94 | int i2o_device_claim_release(struct i2o_device *dev) |
| 95 | { |
| 96 | int tries; |
| 97 | int rc = 0; |
| 98 | |
| 99 | down(&dev->lock); |
| 100 | |
| 101 | /* |
| 102 | * If the controller takes a nonblocking approach to |
| 103 | * releases we have to sleep/poll for a few times. |
| 104 | */ |
| 105 | for (tries = 0; tries < 10; tries++) { |
| 106 | rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_RELEASE, |
| 107 | I2O_CLAIM_PRIMARY); |
| 108 | if (!rc) |
| 109 | break; |
| 110 | |
| 111 | ssleep(1); |
| 112 | } |
| 113 | |
| 114 | if (!rc) |
| 115 | pr_debug("i2o: claim release of device %d succeded\n", |
| 116 | dev->lct_data.tid); |
| 117 | else |
| 118 | pr_debug("i2o: claim release of device %d failed %d\n", |
| 119 | dev->lct_data.tid, rc); |
| 120 | |
| 121 | up(&dev->lock); |
| 122 | |
| 123 | return rc; |
| 124 | }; |
| 125 | |
| 126 | /** |
| 127 | * i2o_device_release - release the memory for a I2O device |
| 128 | * @dev: I2O device which should be released |
| 129 | * |
| 130 | * Release the allocated memory. This function is called if refcount of |
| 131 | * device reaches 0 automatically. |
| 132 | */ |
| 133 | static void i2o_device_release(struct device *dev) |
| 134 | { |
| 135 | struct i2o_device *i2o_dev = to_i2o_device(dev); |
| 136 | |
| 137 | pr_debug("i2o: device %s released\n", dev->bus_id); |
| 138 | |
| 139 | kfree(i2o_dev); |
| 140 | }; |
| 141 | |
| 142 | /** |
| 143 | * i2o_device_class_release - Remove I2O device attributes |
| 144 | * @cd: I2O class device which is added to the I2O device class |
| 145 | * |
| 146 | * Removes attributes from the I2O device again. Also search each device |
| 147 | * on the controller for I2O devices which refert to this device as parent |
| 148 | * or user and remove this links also. |
| 149 | */ |
| 150 | static void i2o_device_class_release(struct class_device *cd) |
| 151 | { |
| 152 | struct i2o_device *i2o_dev, *tmp; |
| 153 | struct i2o_controller *c; |
| 154 | |
| 155 | i2o_dev = to_i2o_device(cd->dev); |
| 156 | c = i2o_dev->iop; |
| 157 | |
| 158 | sysfs_remove_link(&i2o_dev->device.kobj, "parent"); |
| 159 | sysfs_remove_link(&i2o_dev->device.kobj, "user"); |
| 160 | |
| 161 | list_for_each_entry(tmp, &c->devices, list) { |
| 162 | if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid) |
| 163 | sysfs_remove_link(&tmp->device.kobj, "parent"); |
| 164 | if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid) |
| 165 | sysfs_remove_link(&tmp->device.kobj, "user"); |
| 166 | } |
| 167 | }; |
| 168 | |
| 169 | /* I2O device class */ |
| 170 | static struct class i2o_device_class = { |
| 171 | .name = "i2o_device", |
| 172 | .release = i2o_device_class_release |
| 173 | }; |
| 174 | |
| 175 | /** |
| 176 | * i2o_device_alloc - Allocate a I2O device and initialize it |
| 177 | * |
| 178 | * Allocate the memory for a I2O device and initialize locks and lists |
| 179 | * |
| 180 | * Returns the allocated I2O device or a negative error code if the device |
| 181 | * could not be allocated. |
| 182 | */ |
| 183 | static struct i2o_device *i2o_device_alloc(void) |
| 184 | { |
| 185 | struct i2o_device *dev; |
| 186 | |
| 187 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); |
| 188 | if (!dev) |
| 189 | return ERR_PTR(-ENOMEM); |
| 190 | |
| 191 | memset(dev, 0, sizeof(*dev)); |
| 192 | |
| 193 | INIT_LIST_HEAD(&dev->list); |
| 194 | init_MUTEX(&dev->lock); |
| 195 | |
| 196 | dev->device.bus = &i2o_bus_type; |
| 197 | dev->device.release = &i2o_device_release; |
| 198 | dev->classdev.class = &i2o_device_class; |
| 199 | dev->classdev.dev = &dev->device; |
| 200 | |
| 201 | return dev; |
| 202 | }; |
| 203 | |
| 204 | /** |
| 205 | * i2o_device_add - allocate a new I2O device and add it to the IOP |
| 206 | * @iop: I2O controller where the device is on |
| 207 | * @entry: LCT entry of the I2O device |
| 208 | * |
| 209 | * Allocate a new I2O device and initialize it with the LCT entry. The |
| 210 | * device is appended to the device list of the controller. |
| 211 | * |
| 212 | * Returns a pointer to the I2O device on success or negative error code |
| 213 | * on failure. |
| 214 | */ |
| 215 | static struct i2o_device *i2o_device_add(struct i2o_controller *c, |
| 216 | i2o_lct_entry * entry) |
| 217 | { |
| 218 | struct i2o_device *dev; |
| 219 | |
| 220 | dev = i2o_device_alloc(); |
| 221 | if (IS_ERR(dev)) { |
| 222 | printk(KERN_ERR "i2o: unable to allocate i2o device\n"); |
| 223 | return dev; |
| 224 | } |
| 225 | |
| 226 | dev->lct_data = *entry; |
| 227 | |
| 228 | snprintf(dev->device.bus_id, BUS_ID_SIZE, "%d:%03x", c->unit, |
| 229 | dev->lct_data.tid); |
| 230 | |
| 231 | snprintf(dev->classdev.class_id, BUS_ID_SIZE, "%d:%03x", c->unit, |
| 232 | dev->lct_data.tid); |
| 233 | |
| 234 | dev->iop = c; |
| 235 | dev->device.parent = &c->device; |
| 236 | |
| 237 | device_register(&dev->device); |
| 238 | |
| 239 | list_add_tail(&dev->list, &c->devices); |
| 240 | |
| 241 | class_device_register(&dev->classdev); |
| 242 | |
| 243 | i2o_driver_notify_device_add_all(dev); |
| 244 | |
| 245 | pr_debug("i2o: device %s added\n", dev->device.bus_id); |
| 246 | |
| 247 | return dev; |
| 248 | }; |
| 249 | |
| 250 | /** |
| 251 | * i2o_device_remove - remove an I2O device from the I2O core |
| 252 | * @dev: I2O device which should be released |
| 253 | * |
| 254 | * Is used on I2O controller removal or LCT modification, when the device |
| 255 | * is removed from the system. Note that the device could still hang |
| 256 | * around until the refcount reaches 0. |
| 257 | */ |
| 258 | void i2o_device_remove(struct i2o_device *i2o_dev) |
| 259 | { |
| 260 | i2o_driver_notify_device_remove_all(i2o_dev); |
| 261 | class_device_unregister(&i2o_dev->classdev); |
| 262 | list_del(&i2o_dev->list); |
| 263 | device_unregister(&i2o_dev->device); |
| 264 | }; |
| 265 | |
| 266 | /** |
| 267 | * i2o_device_parse_lct - Parse a previously fetched LCT and create devices |
| 268 | * @c: I2O controller from which the LCT should be parsed. |
| 269 | * |
| 270 | * The Logical Configuration Table tells us what we can talk to on the |
| 271 | * board. For every entry we create an I2O device, which is registered in |
| 272 | * the I2O core. |
| 273 | * |
| 274 | * Returns 0 on success or negative error code on failure. |
| 275 | */ |
| 276 | int i2o_device_parse_lct(struct i2o_controller *c) |
| 277 | { |
| 278 | struct i2o_device *dev, *tmp; |
| 279 | i2o_lct *lct; |
| 280 | int i; |
| 281 | int max; |
| 282 | |
| 283 | down(&c->lct_lock); |
| 284 | |
| 285 | if (c->lct) |
| 286 | kfree(c->lct); |
| 287 | |
| 288 | lct = c->dlct.virt; |
| 289 | |
| 290 | c->lct = kmalloc(lct->table_size * 4, GFP_KERNEL); |
| 291 | if (!c->lct) { |
| 292 | up(&c->lct_lock); |
| 293 | return -ENOMEM; |
| 294 | } |
| 295 | |
| 296 | if (lct->table_size * 4 > c->dlct.len) { |
| 297 | memcpy_fromio(c->lct, c->dlct.virt, c->dlct.len); |
| 298 | up(&c->lct_lock); |
| 299 | return -EAGAIN; |
| 300 | } |
| 301 | |
| 302 | memcpy_fromio(c->lct, c->dlct.virt, lct->table_size * 4); |
| 303 | |
| 304 | lct = c->lct; |
| 305 | |
| 306 | max = (lct->table_size - 3) / 9; |
| 307 | |
| 308 | pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max, |
| 309 | lct->table_size); |
| 310 | |
| 311 | /* remove devices, which are not in the LCT anymore */ |
| 312 | list_for_each_entry_safe(dev, tmp, &c->devices, list) { |
| 313 | int found = 0; |
| 314 | |
| 315 | for (i = 0; i < max; i++) { |
| 316 | if (lct->lct_entry[i].tid == dev->lct_data.tid) { |
| 317 | found = 1; |
| 318 | break; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | if (!found) |
| 323 | i2o_device_remove(dev); |
| 324 | } |
| 325 | |
| 326 | /* add new devices, which are new in the LCT */ |
| 327 | for (i = 0; i < max; i++) { |
| 328 | int found = 0; |
| 329 | |
| 330 | list_for_each_entry_safe(dev, tmp, &c->devices, list) { |
| 331 | if (lct->lct_entry[i].tid == dev->lct_data.tid) { |
| 332 | found = 1; |
| 333 | break; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | if (!found) |
| 338 | i2o_device_add(c, &lct->lct_entry[i]); |
| 339 | } |
| 340 | up(&c->lct_lock); |
| 341 | |
| 342 | return 0; |
| 343 | }; |
| 344 | |
| 345 | /** |
| 346 | * i2o_device_class_show_class_id - Displays class id of I2O device |
| 347 | * @cd: class device of which the class id should be displayed |
| 348 | * @buf: buffer into which the class id should be printed |
| 349 | * |
| 350 | * Returns the number of bytes which are printed into the buffer. |
| 351 | */ |
| 352 | static ssize_t i2o_device_class_show_class_id(struct class_device *cd, |
| 353 | char *buf) |
| 354 | { |
| 355 | struct i2o_device *dev = to_i2o_device(cd->dev); |
| 356 | |
| 357 | sprintf(buf, "%03x\n", dev->lct_data.class_id); |
| 358 | return strlen(buf) + 1; |
| 359 | }; |
| 360 | |
| 361 | /** |
| 362 | * i2o_device_class_show_tid - Displays TID of I2O device |
| 363 | * @cd: class device of which the TID should be displayed |
| 364 | * @buf: buffer into which the class id should be printed |
| 365 | * |
| 366 | * Returns the number of bytes which are printed into the buffer. |
| 367 | */ |
| 368 | static ssize_t i2o_device_class_show_tid(struct class_device *cd, char *buf) |
| 369 | { |
| 370 | struct i2o_device *dev = to_i2o_device(cd->dev); |
| 371 | |
| 372 | sprintf(buf, "%03x\n", dev->lct_data.tid); |
| 373 | return strlen(buf) + 1; |
| 374 | }; |
| 375 | |
| 376 | /* I2O device class attributes */ |
| 377 | static CLASS_DEVICE_ATTR(class_id, S_IRUGO, i2o_device_class_show_class_id, |
| 378 | NULL); |
| 379 | static CLASS_DEVICE_ATTR(tid, S_IRUGO, i2o_device_class_show_tid, NULL); |
| 380 | |
| 381 | /** |
| 382 | * i2o_device_class_add - Adds attributes to the I2O device |
| 383 | * @cd: I2O class device which is added to the I2O device class |
| 384 | * |
| 385 | * This function get called when a I2O device is added to the class. It |
| 386 | * creates the attributes for each device and creates user/parent symlink |
| 387 | * if necessary. |
| 388 | * |
| 389 | * Returns 0 on success or negative error code on failure. |
| 390 | */ |
| 391 | static int i2o_device_class_add(struct class_device *cd) |
| 392 | { |
| 393 | struct i2o_device *i2o_dev, *tmp; |
| 394 | struct i2o_controller *c; |
| 395 | |
| 396 | i2o_dev = to_i2o_device(cd->dev); |
| 397 | c = i2o_dev->iop; |
| 398 | |
| 399 | class_device_create_file(cd, &class_device_attr_class_id); |
| 400 | class_device_create_file(cd, &class_device_attr_tid); |
| 401 | |
| 402 | /* create user entries for this device */ |
| 403 | tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid); |
| 404 | if (tmp) |
| 405 | sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj, |
| 406 | "user"); |
| 407 | |
| 408 | /* create user entries refering to this device */ |
| 409 | list_for_each_entry(tmp, &c->devices, list) |
| 410 | if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid) |
| 411 | sysfs_create_link(&tmp->device.kobj, |
| 412 | &i2o_dev->device.kobj, "user"); |
| 413 | |
| 414 | /* create parent entries for this device */ |
| 415 | tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid); |
| 416 | if (tmp) |
| 417 | sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj, |
| 418 | "parent"); |
| 419 | |
| 420 | /* create parent entries refering to this device */ |
| 421 | list_for_each_entry(tmp, &c->devices, list) |
| 422 | if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid) |
| 423 | sysfs_create_link(&tmp->device.kobj, |
| 424 | &i2o_dev->device.kobj, "parent"); |
| 425 | |
| 426 | return 0; |
| 427 | }; |
| 428 | |
| 429 | /* I2O device class interface */ |
| 430 | static struct class_interface i2o_device_class_interface = { |
| 431 | .class = &i2o_device_class, |
| 432 | .add = i2o_device_class_add |
| 433 | }; |
| 434 | |
| 435 | /* |
| 436 | * Run time support routines |
| 437 | */ |
| 438 | |
| 439 | /* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET |
| 440 | * |
| 441 | * This function can be used for all UtilParamsGet/Set operations. |
| 442 | * The OperationList is given in oplist-buffer, |
| 443 | * and results are returned in reslist-buffer. |
| 444 | * Note that the minimum sized reslist is 8 bytes and contains |
| 445 | * ResultCount, ErrorInfoSize, BlockStatus and BlockSize. |
| 446 | */ |
| 447 | |
| 448 | int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist, |
| 449 | int oplen, void *reslist, int reslen) |
| 450 | { |
| 451 | struct i2o_message __iomem *msg; |
| 452 | u32 m; |
| 453 | u32 *res32 = (u32 *) reslist; |
| 454 | u32 *restmp = (u32 *) reslist; |
| 455 | int len = 0; |
| 456 | int i = 0; |
| 457 | int rc; |
| 458 | struct i2o_dma res; |
| 459 | struct i2o_controller *c = i2o_dev->iop; |
| 460 | struct device *dev = &c->pdev->dev; |
| 461 | |
| 462 | res.virt = NULL; |
| 463 | |
| 464 | if (i2o_dma_alloc(dev, &res, reslen, GFP_KERNEL)) |
| 465 | return -ENOMEM; |
| 466 | |
| 467 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 468 | if (m == I2O_QUEUE_EMPTY) { |
| 469 | i2o_dma_free(dev, &res); |
| 470 | return -ETIMEDOUT; |
| 471 | } |
| 472 | |
| 473 | i = 0; |
| 474 | writel(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid, |
| 475 | &msg->u.head[1]); |
| 476 | writel(0, &msg->body[i++]); |
| 477 | writel(0x4C000000 | oplen, &msg->body[i++]); /* OperationList */ |
| 478 | memcpy_toio(&msg->body[i], oplist, oplen); |
| 479 | i += (oplen / 4 + (oplen % 4 ? 1 : 0)); |
| 480 | writel(0xD0000000 | res.len, &msg->body[i++]); /* ResultList */ |
| 481 | writel(res.phys, &msg->body[i++]); |
| 482 | |
| 483 | writel(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) | |
| 484 | SGL_OFFSET_5, &msg->u.head[0]); |
| 485 | |
| 486 | rc = i2o_msg_post_wait_mem(c, m, 10, &res); |
| 487 | |
| 488 | /* This only looks like a memory leak - don't "fix" it. */ |
| 489 | if (rc == -ETIMEDOUT) |
| 490 | return rc; |
| 491 | |
| 492 | memcpy_fromio(reslist, res.virt, res.len); |
| 493 | i2o_dma_free(dev, &res); |
| 494 | |
| 495 | /* Query failed */ |
| 496 | if (rc) |
| 497 | return rc; |
| 498 | /* |
| 499 | * Calculate number of bytes of Result LIST |
| 500 | * We need to loop through each Result BLOCK and grab the length |
| 501 | */ |
| 502 | restmp = res32 + 1; |
| 503 | len = 1; |
| 504 | for (i = 0; i < (res32[0] & 0X0000FFFF); i++) { |
| 505 | if (restmp[0] & 0x00FF0000) { /* BlockStatus != SUCCESS */ |
| 506 | printk(KERN_WARNING |
| 507 | "%s - Error:\n ErrorInfoSize = 0x%02x, " |
| 508 | "BlockStatus = 0x%02x, BlockSize = 0x%04x\n", |
| 509 | (cmd == |
| 510 | I2O_CMD_UTIL_PARAMS_SET) ? "PARAMS_SET" : |
| 511 | "PARAMS_GET", res32[1] >> 24, |
| 512 | (res32[1] >> 16) & 0xFF, res32[1] & 0xFFFF); |
| 513 | |
| 514 | /* |
| 515 | * If this is the only request,than we return an error |
| 516 | */ |
| 517 | if ((res32[0] & 0x0000FFFF) == 1) { |
| 518 | return -((res32[1] >> 16) & 0xFF); /* -BlockStatus */ |
| 519 | } |
| 520 | } |
| 521 | len += restmp[0] & 0x0000FFFF; /* Length of res BLOCK */ |
| 522 | restmp += restmp[0] & 0x0000FFFF; /* Skip to next BLOCK */ |
| 523 | } |
| 524 | return (len << 2); /* bytes used by result list */ |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Query one field group value or a whole scalar group. |
| 529 | */ |
| 530 | int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field, |
| 531 | void *buf, int buflen) |
| 532 | { |
| 533 | u16 opblk[] = { 1, 0, I2O_PARAMS_FIELD_GET, group, 1, field }; |
| 534 | u8 resblk[8 + buflen]; /* 8 bytes for header */ |
| 535 | int size; |
| 536 | |
| 537 | if (field == -1) /* whole group */ |
| 538 | opblk[4] = -1; |
| 539 | |
| 540 | size = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk, |
| 541 | sizeof(opblk), resblk, sizeof(resblk)); |
| 542 | |
| 543 | memcpy(buf, resblk + 8, buflen); /* cut off header */ |
| 544 | |
| 545 | if (size > buflen) |
| 546 | return buflen; |
| 547 | |
| 548 | return size; |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * if oper == I2O_PARAMS_TABLE_GET, get from all rows |
| 553 | * if fieldcount == -1 return all fields |
| 554 | * ibuf and ibuflen are unused (use NULL, 0) |
| 555 | * else return specific fields |
| 556 | * ibuf contains fieldindexes |
| 557 | * |
| 558 | * if oper == I2O_PARAMS_LIST_GET, get from specific rows |
| 559 | * if fieldcount == -1 return all fields |
| 560 | * ibuf contains rowcount, keyvalues |
| 561 | * else return specific fields |
| 562 | * fieldcount is # of fieldindexes |
| 563 | * ibuf contains fieldindexes, rowcount, keyvalues |
| 564 | * |
| 565 | * You could also use directly function i2o_issue_params(). |
| 566 | */ |
| 567 | int i2o_parm_table_get(struct i2o_device *dev, int oper, int group, |
| 568 | int fieldcount, void *ibuf, int ibuflen, void *resblk, |
| 569 | int reslen) |
| 570 | { |
| 571 | u16 *opblk; |
| 572 | int size; |
| 573 | |
| 574 | size = 10 + ibuflen; |
| 575 | if (size % 4) |
| 576 | size += 4 - size % 4; |
| 577 | |
| 578 | opblk = kmalloc(size, GFP_KERNEL); |
| 579 | if (opblk == NULL) { |
| 580 | printk(KERN_ERR "i2o: no memory for query buffer.\n"); |
| 581 | return -ENOMEM; |
| 582 | } |
| 583 | |
| 584 | opblk[0] = 1; /* operation count */ |
| 585 | opblk[1] = 0; /* pad */ |
| 586 | opblk[2] = oper; |
| 587 | opblk[3] = group; |
| 588 | opblk[4] = fieldcount; |
| 589 | memcpy(opblk + 5, ibuf, ibuflen); /* other params */ |
| 590 | |
| 591 | size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk, |
| 592 | size, resblk, reslen); |
| 593 | |
| 594 | kfree(opblk); |
| 595 | if (size > reslen) |
| 596 | return reslen; |
| 597 | |
| 598 | return size; |
| 599 | } |
| 600 | |
| 601 | /** |
| 602 | * i2o_device_init - Initialize I2O devices |
| 603 | * |
| 604 | * Registers the I2O device class. |
| 605 | * |
| 606 | * Returns 0 on success or negative error code on failure. |
| 607 | */ |
| 608 | int i2o_device_init(void) |
| 609 | { |
| 610 | int rc; |
| 611 | |
| 612 | rc = class_register(&i2o_device_class); |
| 613 | if (rc) |
| 614 | return rc; |
| 615 | |
| 616 | return class_interface_register(&i2o_device_class_interface); |
| 617 | }; |
| 618 | |
| 619 | /** |
| 620 | * i2o_device_exit - I2O devices exit function |
| 621 | * |
| 622 | * Unregisters the I2O device class. |
| 623 | */ |
| 624 | void i2o_device_exit(void) |
| 625 | { |
| 626 | class_interface_register(&i2o_device_class_interface); |
| 627 | class_unregister(&i2o_device_class); |
| 628 | }; |
| 629 | |
| 630 | EXPORT_SYMBOL(i2o_device_claim); |
| 631 | EXPORT_SYMBOL(i2o_device_claim_release); |
| 632 | EXPORT_SYMBOL(i2o_parm_field_get); |
| 633 | EXPORT_SYMBOL(i2o_parm_table_get); |
| 634 | EXPORT_SYMBOL(i2o_parm_issue); |