Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PCI HotPlug Controller Core |
| 3 | * |
| 4 | * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com) |
| 5 | * Copyright (C) 2001-2002 IBM Corp. |
| 6 | * |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or (at |
| 12 | * your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 17 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 18 | * details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | * |
| 24 | * Send feedback to <greg@kroah.com> |
| 25 | * |
| 26 | * Filesystem portion based on work done by Pat Mochel on ddfs/driverfs |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/config.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/moduleparam.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/types.h> |
| 35 | #include <linux/list.h> |
| 36 | #include <linux/pagemap.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/smp_lock.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/mount.h> |
| 41 | #include <linux/namei.h> |
| 42 | #include <linux/pci.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | #include <linux/kobject.h> |
| 45 | #include <linux/sysfs.h> |
| 46 | #include "pci_hotplug.h" |
| 47 | |
| 48 | |
| 49 | #define MY_NAME "pci_hotplug" |
| 50 | |
| 51 | #define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0) |
| 52 | #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg) |
| 53 | #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg) |
| 54 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg) |
| 55 | |
| 56 | |
| 57 | /* local variables */ |
| 58 | static int debug; |
| 59 | |
| 60 | #define DRIVER_VERSION "0.5" |
| 61 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>" |
| 62 | #define DRIVER_DESC "PCI Hot Plug PCI Core" |
| 63 | |
| 64 | |
| 65 | ////////////////////////////////////////////////////////////////// |
| 66 | |
| 67 | static LIST_HEAD(pci_hotplug_slot_list); |
| 68 | |
| 69 | struct subsystem pci_hotplug_slots_subsys; |
| 70 | |
| 71 | static ssize_t hotplug_slot_attr_show(struct kobject *kobj, |
| 72 | struct attribute *attr, char *buf) |
| 73 | { |
| 74 | struct hotplug_slot *slot = to_hotplug_slot(kobj); |
| 75 | struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr); |
| 76 | return attribute->show ? attribute->show(slot, buf) : 0; |
| 77 | } |
| 78 | |
| 79 | static ssize_t hotplug_slot_attr_store(struct kobject *kobj, |
| 80 | struct attribute *attr, const char *buf, size_t len) |
| 81 | { |
| 82 | struct hotplug_slot *slot = to_hotplug_slot(kobj); |
| 83 | struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr); |
| 84 | return attribute->store ? attribute->store(slot, buf, len) : 0; |
| 85 | } |
| 86 | |
| 87 | static struct sysfs_ops hotplug_slot_sysfs_ops = { |
| 88 | .show = hotplug_slot_attr_show, |
| 89 | .store = hotplug_slot_attr_store, |
| 90 | }; |
| 91 | |
| 92 | static void hotplug_slot_release(struct kobject *kobj) |
| 93 | { |
| 94 | struct hotplug_slot *slot = to_hotplug_slot(kobj); |
| 95 | if (slot->release) |
| 96 | slot->release(slot); |
| 97 | } |
| 98 | |
| 99 | static struct kobj_type hotplug_slot_ktype = { |
| 100 | .sysfs_ops = &hotplug_slot_sysfs_ops, |
| 101 | .release = &hotplug_slot_release, |
| 102 | }; |
| 103 | |
| 104 | decl_subsys_name(pci_hotplug_slots, slots, &hotplug_slot_ktype, NULL); |
| 105 | |
| 106 | /* these strings match up with the values in pci_bus_speed */ |
| 107 | static char *pci_bus_speed_strings[] = { |
| 108 | "33 MHz PCI", /* 0x00 */ |
| 109 | "66 MHz PCI", /* 0x01 */ |
| 110 | "66 MHz PCIX", /* 0x02 */ |
| 111 | "100 MHz PCIX", /* 0x03 */ |
| 112 | "133 MHz PCIX", /* 0x04 */ |
| 113 | NULL, /* 0x05 */ |
| 114 | NULL, /* 0x06 */ |
| 115 | NULL, /* 0x07 */ |
| 116 | NULL, /* 0x08 */ |
| 117 | "66 MHz PCIX 266", /* 0x09 */ |
| 118 | "100 MHz PCIX 266", /* 0x0a */ |
| 119 | "133 MHz PCIX 266", /* 0x0b */ |
| 120 | NULL, /* 0x0c */ |
| 121 | NULL, /* 0x0d */ |
| 122 | NULL, /* 0x0e */ |
| 123 | NULL, /* 0x0f */ |
| 124 | NULL, /* 0x10 */ |
| 125 | "66 MHz PCIX 533", /* 0x11 */ |
| 126 | "100 MHz PCIX 533", /* 0x12 */ |
| 127 | "133 MHz PCIX 533", /* 0x13 */ |
| 128 | "25 GBps PCI-E", /* 0x14 */ |
| 129 | }; |
| 130 | |
| 131 | #ifdef CONFIG_HOTPLUG_PCI_CPCI |
| 132 | extern int cpci_hotplug_init(int debug); |
| 133 | extern void cpci_hotplug_exit(void); |
| 134 | #else |
| 135 | static inline int cpci_hotplug_init(int debug) { return 0; } |
| 136 | static inline void cpci_hotplug_exit(void) { } |
| 137 | #endif |
| 138 | |
| 139 | /* Weee, fun with macros... */ |
| 140 | #define GET_STATUS(name,type) \ |
| 141 | static int get_##name (struct hotplug_slot *slot, type *value) \ |
| 142 | { \ |
| 143 | struct hotplug_slot_ops *ops = slot->ops; \ |
| 144 | int retval = 0; \ |
| 145 | if (try_module_get(ops->owner)) { \ |
| 146 | if (ops->get_##name) \ |
| 147 | retval = ops->get_##name (slot, value); \ |
| 148 | else \ |
| 149 | *value = slot->info->name; \ |
| 150 | module_put(ops->owner); \ |
| 151 | } \ |
| 152 | return retval; \ |
| 153 | } |
| 154 | |
| 155 | GET_STATUS(power_status, u8) |
| 156 | GET_STATUS(attention_status, u8) |
| 157 | GET_STATUS(latch_status, u8) |
| 158 | GET_STATUS(adapter_status, u8) |
| 159 | GET_STATUS(address, u32) |
| 160 | GET_STATUS(max_bus_speed, enum pci_bus_speed) |
| 161 | GET_STATUS(cur_bus_speed, enum pci_bus_speed) |
| 162 | |
| 163 | static ssize_t power_read_file (struct hotplug_slot *slot, char *buf) |
| 164 | { |
| 165 | int retval; |
| 166 | u8 value; |
| 167 | |
| 168 | retval = get_power_status (slot, &value); |
| 169 | if (retval) |
| 170 | goto exit; |
| 171 | retval = sprintf (buf, "%d\n", value); |
| 172 | exit: |
| 173 | return retval; |
| 174 | } |
| 175 | |
| 176 | static ssize_t power_write_file (struct hotplug_slot *slot, const char *buf, |
| 177 | size_t count) |
| 178 | { |
| 179 | unsigned long lpower; |
| 180 | u8 power; |
| 181 | int retval = 0; |
| 182 | |
| 183 | lpower = simple_strtoul (buf, NULL, 10); |
| 184 | power = (u8)(lpower & 0xff); |
| 185 | dbg ("power = %d\n", power); |
| 186 | |
| 187 | if (!try_module_get(slot->ops->owner)) { |
| 188 | retval = -ENODEV; |
| 189 | goto exit; |
| 190 | } |
| 191 | switch (power) { |
| 192 | case 0: |
| 193 | if (slot->ops->disable_slot) |
| 194 | retval = slot->ops->disable_slot(slot); |
| 195 | break; |
| 196 | |
| 197 | case 1: |
| 198 | if (slot->ops->enable_slot) |
| 199 | retval = slot->ops->enable_slot(slot); |
| 200 | break; |
| 201 | |
| 202 | default: |
| 203 | err ("Illegal value specified for power\n"); |
| 204 | retval = -EINVAL; |
| 205 | } |
| 206 | module_put(slot->ops->owner); |
| 207 | |
| 208 | exit: |
| 209 | if (retval) |
| 210 | return retval; |
| 211 | return count; |
| 212 | } |
| 213 | |
| 214 | static struct hotplug_slot_attribute hotplug_slot_attr_power = { |
| 215 | .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR}, |
| 216 | .show = power_read_file, |
| 217 | .store = power_write_file |
| 218 | }; |
| 219 | |
| 220 | static ssize_t attention_read_file (struct hotplug_slot *slot, char *buf) |
| 221 | { |
| 222 | int retval; |
| 223 | u8 value; |
| 224 | |
| 225 | retval = get_attention_status (slot, &value); |
| 226 | if (retval) |
| 227 | goto exit; |
| 228 | retval = sprintf (buf, "%d\n", value); |
| 229 | |
| 230 | exit: |
| 231 | return retval; |
| 232 | } |
| 233 | |
| 234 | static ssize_t attention_write_file (struct hotplug_slot *slot, const char *buf, |
| 235 | size_t count) |
| 236 | { |
| 237 | unsigned long lattention; |
| 238 | u8 attention; |
| 239 | int retval = 0; |
| 240 | |
| 241 | lattention = simple_strtoul (buf, NULL, 10); |
| 242 | attention = (u8)(lattention & 0xff); |
| 243 | dbg (" - attention = %d\n", attention); |
| 244 | |
| 245 | if (!try_module_get(slot->ops->owner)) { |
| 246 | retval = -ENODEV; |
| 247 | goto exit; |
| 248 | } |
| 249 | if (slot->ops->set_attention_status) |
| 250 | retval = slot->ops->set_attention_status(slot, attention); |
| 251 | module_put(slot->ops->owner); |
| 252 | |
| 253 | exit: |
| 254 | if (retval) |
| 255 | return retval; |
| 256 | return count; |
| 257 | } |
| 258 | |
| 259 | static struct hotplug_slot_attribute hotplug_slot_attr_attention = { |
| 260 | .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR}, |
| 261 | .show = attention_read_file, |
| 262 | .store = attention_write_file |
| 263 | }; |
| 264 | |
| 265 | static ssize_t latch_read_file (struct hotplug_slot *slot, char *buf) |
| 266 | { |
| 267 | int retval; |
| 268 | u8 value; |
| 269 | |
| 270 | retval = get_latch_status (slot, &value); |
| 271 | if (retval) |
| 272 | goto exit; |
| 273 | retval = sprintf (buf, "%d\n", value); |
| 274 | |
| 275 | exit: |
| 276 | return retval; |
| 277 | } |
| 278 | |
| 279 | static struct hotplug_slot_attribute hotplug_slot_attr_latch = { |
| 280 | .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO}, |
| 281 | .show = latch_read_file, |
| 282 | }; |
| 283 | |
| 284 | static ssize_t presence_read_file (struct hotplug_slot *slot, char *buf) |
| 285 | { |
| 286 | int retval; |
| 287 | u8 value; |
| 288 | |
| 289 | retval = get_adapter_status (slot, &value); |
| 290 | if (retval) |
| 291 | goto exit; |
| 292 | retval = sprintf (buf, "%d\n", value); |
| 293 | |
| 294 | exit: |
| 295 | return retval; |
| 296 | } |
| 297 | |
| 298 | static struct hotplug_slot_attribute hotplug_slot_attr_presence = { |
| 299 | .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO}, |
| 300 | .show = presence_read_file, |
| 301 | }; |
| 302 | |
| 303 | static ssize_t address_read_file (struct hotplug_slot *slot, char *buf) |
| 304 | { |
| 305 | int retval; |
| 306 | u32 address; |
| 307 | |
| 308 | retval = get_address (slot, &address); |
| 309 | if (retval) |
| 310 | goto exit; |
| 311 | retval = sprintf (buf, "%04x:%02x:%02x\n", |
| 312 | (address >> 16) & 0xffff, |
| 313 | (address >> 8) & 0xff, |
| 314 | address & 0xff); |
| 315 | |
| 316 | exit: |
| 317 | return retval; |
| 318 | } |
| 319 | |
| 320 | static struct hotplug_slot_attribute hotplug_slot_attr_address = { |
| 321 | .attr = {.name = "address", .mode = S_IFREG | S_IRUGO}, |
| 322 | .show = address_read_file, |
| 323 | }; |
| 324 | |
| 325 | static char *unknown_speed = "Unknown bus speed"; |
| 326 | |
| 327 | static ssize_t max_bus_speed_read_file (struct hotplug_slot *slot, char *buf) |
| 328 | { |
| 329 | char *speed_string; |
| 330 | int retval; |
| 331 | enum pci_bus_speed value; |
| 332 | |
| 333 | retval = get_max_bus_speed (slot, &value); |
| 334 | if (retval) |
| 335 | goto exit; |
| 336 | |
| 337 | if (value == PCI_SPEED_UNKNOWN) |
| 338 | speed_string = unknown_speed; |
| 339 | else |
| 340 | speed_string = pci_bus_speed_strings[value]; |
| 341 | |
| 342 | retval = sprintf (buf, "%s\n", speed_string); |
| 343 | |
| 344 | exit: |
| 345 | return retval; |
| 346 | } |
| 347 | |
| 348 | static struct hotplug_slot_attribute hotplug_slot_attr_max_bus_speed = { |
| 349 | .attr = {.name = "max_bus_speed", .mode = S_IFREG | S_IRUGO}, |
| 350 | .show = max_bus_speed_read_file, |
| 351 | }; |
| 352 | |
| 353 | static ssize_t cur_bus_speed_read_file (struct hotplug_slot *slot, char *buf) |
| 354 | { |
| 355 | char *speed_string; |
| 356 | int retval; |
| 357 | enum pci_bus_speed value; |
| 358 | |
| 359 | retval = get_cur_bus_speed (slot, &value); |
| 360 | if (retval) |
| 361 | goto exit; |
| 362 | |
| 363 | if (value == PCI_SPEED_UNKNOWN) |
| 364 | speed_string = unknown_speed; |
| 365 | else |
| 366 | speed_string = pci_bus_speed_strings[value]; |
| 367 | |
| 368 | retval = sprintf (buf, "%s\n", speed_string); |
| 369 | |
| 370 | exit: |
| 371 | return retval; |
| 372 | } |
| 373 | |
| 374 | static struct hotplug_slot_attribute hotplug_slot_attr_cur_bus_speed = { |
| 375 | .attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO}, |
| 376 | .show = cur_bus_speed_read_file, |
| 377 | }; |
| 378 | |
| 379 | static ssize_t test_write_file (struct hotplug_slot *slot, const char *buf, |
| 380 | size_t count) |
| 381 | { |
| 382 | unsigned long ltest; |
| 383 | u32 test; |
| 384 | int retval = 0; |
| 385 | |
| 386 | ltest = simple_strtoul (buf, NULL, 10); |
| 387 | test = (u32)(ltest & 0xffffffff); |
| 388 | dbg ("test = %d\n", test); |
| 389 | |
| 390 | if (!try_module_get(slot->ops->owner)) { |
| 391 | retval = -ENODEV; |
| 392 | goto exit; |
| 393 | } |
| 394 | if (slot->ops->hardware_test) |
| 395 | retval = slot->ops->hardware_test(slot, test); |
| 396 | module_put(slot->ops->owner); |
| 397 | |
| 398 | exit: |
| 399 | if (retval) |
| 400 | return retval; |
| 401 | return count; |
| 402 | } |
| 403 | |
| 404 | static struct hotplug_slot_attribute hotplug_slot_attr_test = { |
| 405 | .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR}, |
| 406 | .store = test_write_file |
| 407 | }; |
| 408 | |
| 409 | static int has_power_file (struct hotplug_slot *slot) |
| 410 | { |
| 411 | if ((!slot) || (!slot->ops)) |
| 412 | return -ENODEV; |
| 413 | if ((slot->ops->enable_slot) || |
| 414 | (slot->ops->disable_slot) || |
| 415 | (slot->ops->get_power_status)) |
| 416 | return 0; |
| 417 | return -ENOENT; |
| 418 | } |
| 419 | |
| 420 | static int has_attention_file (struct hotplug_slot *slot) |
| 421 | { |
| 422 | if ((!slot) || (!slot->ops)) |
| 423 | return -ENODEV; |
| 424 | if ((slot->ops->set_attention_status) || |
| 425 | (slot->ops->get_attention_status)) |
| 426 | return 0; |
| 427 | return -ENOENT; |
| 428 | } |
| 429 | |
| 430 | static int has_latch_file (struct hotplug_slot *slot) |
| 431 | { |
| 432 | if ((!slot) || (!slot->ops)) |
| 433 | return -ENODEV; |
| 434 | if (slot->ops->get_latch_status) |
| 435 | return 0; |
| 436 | return -ENOENT; |
| 437 | } |
| 438 | |
| 439 | static int has_adapter_file (struct hotplug_slot *slot) |
| 440 | { |
| 441 | if ((!slot) || (!slot->ops)) |
| 442 | return -ENODEV; |
| 443 | if (slot->ops->get_adapter_status) |
| 444 | return 0; |
| 445 | return -ENOENT; |
| 446 | } |
| 447 | |
| 448 | static int has_address_file (struct hotplug_slot *slot) |
| 449 | { |
| 450 | if ((!slot) || (!slot->ops)) |
| 451 | return -ENODEV; |
| 452 | if (slot->ops->get_address) |
| 453 | return 0; |
| 454 | return -ENOENT; |
| 455 | } |
| 456 | |
| 457 | static int has_max_bus_speed_file (struct hotplug_slot *slot) |
| 458 | { |
| 459 | if ((!slot) || (!slot->ops)) |
| 460 | return -ENODEV; |
| 461 | if (slot->ops->get_max_bus_speed) |
| 462 | return 0; |
| 463 | return -ENOENT; |
| 464 | } |
| 465 | |
| 466 | static int has_cur_bus_speed_file (struct hotplug_slot *slot) |
| 467 | { |
| 468 | if ((!slot) || (!slot->ops)) |
| 469 | return -ENODEV; |
| 470 | if (slot->ops->get_cur_bus_speed) |
| 471 | return 0; |
| 472 | return -ENOENT; |
| 473 | } |
| 474 | |
| 475 | static int has_test_file (struct hotplug_slot *slot) |
| 476 | { |
| 477 | if ((!slot) || (!slot->ops)) |
| 478 | return -ENODEV; |
| 479 | if (slot->ops->hardware_test) |
| 480 | return 0; |
| 481 | return -ENOENT; |
| 482 | } |
| 483 | |
| 484 | static int fs_add_slot (struct hotplug_slot *slot) |
| 485 | { |
| 486 | if (has_power_file(slot) == 0) |
| 487 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr); |
| 488 | |
| 489 | if (has_attention_file(slot) == 0) |
| 490 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_attention.attr); |
| 491 | |
| 492 | if (has_latch_file(slot) == 0) |
| 493 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_latch.attr); |
| 494 | |
| 495 | if (has_adapter_file(slot) == 0) |
| 496 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_presence.attr); |
| 497 | |
| 498 | if (has_address_file(slot) == 0) |
| 499 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_address.attr); |
| 500 | |
| 501 | if (has_max_bus_speed_file(slot) == 0) |
| 502 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr); |
| 503 | |
| 504 | if (has_cur_bus_speed_file(slot) == 0) |
| 505 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr); |
| 506 | |
| 507 | if (has_test_file(slot) == 0) |
| 508 | sysfs_create_file(&slot->kobj, &hotplug_slot_attr_test.attr); |
| 509 | |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | static void fs_remove_slot (struct hotplug_slot *slot) |
| 514 | { |
| 515 | if (has_power_file(slot) == 0) |
| 516 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr); |
| 517 | |
| 518 | if (has_attention_file(slot) == 0) |
| 519 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr); |
| 520 | |
| 521 | if (has_latch_file(slot) == 0) |
| 522 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr); |
| 523 | |
| 524 | if (has_adapter_file(slot) == 0) |
| 525 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr); |
| 526 | |
| 527 | if (has_address_file(slot) == 0) |
| 528 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_address.attr); |
| 529 | |
| 530 | if (has_max_bus_speed_file(slot) == 0) |
| 531 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr); |
| 532 | |
| 533 | if (has_cur_bus_speed_file(slot) == 0) |
| 534 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr); |
| 535 | |
| 536 | if (has_test_file(slot) == 0) |
| 537 | sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr); |
| 538 | } |
| 539 | |
| 540 | static struct hotplug_slot *get_slot_from_name (const char *name) |
| 541 | { |
| 542 | struct hotplug_slot *slot; |
| 543 | struct list_head *tmp; |
| 544 | |
| 545 | list_for_each (tmp, &pci_hotplug_slot_list) { |
| 546 | slot = list_entry (tmp, struct hotplug_slot, slot_list); |
| 547 | if (strcmp(slot->name, name) == 0) |
| 548 | return slot; |
| 549 | } |
| 550 | return NULL; |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | * pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem |
| 555 | * @slot: pointer to the &struct hotplug_slot to register |
| 556 | * |
| 557 | * Registers a hotplug slot with the pci hotplug subsystem, which will allow |
| 558 | * userspace interaction to the slot. |
| 559 | * |
| 560 | * Returns 0 if successful, anything else for an error. |
| 561 | */ |
| 562 | int pci_hp_register (struct hotplug_slot *slot) |
| 563 | { |
| 564 | int result; |
| 565 | |
| 566 | if (slot == NULL) |
| 567 | return -ENODEV; |
| 568 | if ((slot->info == NULL) || (slot->ops == NULL)) |
| 569 | return -EINVAL; |
| 570 | if (slot->release == NULL) { |
| 571 | dbg("Why are you trying to register a hotplug slot" |
| 572 | "without a proper release function?\n"); |
| 573 | return -EINVAL; |
| 574 | } |
| 575 | |
| 576 | kobject_set_name(&slot->kobj, "%s", slot->name); |
| 577 | kobj_set_kset_s(slot, pci_hotplug_slots_subsys); |
| 578 | |
| 579 | /* this can fail if we have already registered a slot with the same name */ |
| 580 | if (kobject_register(&slot->kobj)) { |
| 581 | err("Unable to register kobject"); |
| 582 | return -EINVAL; |
| 583 | } |
| 584 | |
| 585 | list_add (&slot->slot_list, &pci_hotplug_slot_list); |
| 586 | |
| 587 | result = fs_add_slot (slot); |
| 588 | dbg ("Added slot %s to the list\n", slot->name); |
| 589 | return result; |
| 590 | } |
| 591 | |
| 592 | /** |
| 593 | * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem |
| 594 | * @slot: pointer to the &struct hotplug_slot to deregister |
| 595 | * |
| 596 | * The @slot must have been registered with the pci hotplug subsystem |
| 597 | * previously with a call to pci_hp_register(). |
| 598 | * |
| 599 | * Returns 0 if successful, anything else for an error. |
| 600 | */ |
| 601 | int pci_hp_deregister (struct hotplug_slot *slot) |
| 602 | { |
| 603 | struct hotplug_slot *temp; |
| 604 | |
| 605 | if (slot == NULL) |
| 606 | return -ENODEV; |
| 607 | |
| 608 | temp = get_slot_from_name (slot->name); |
| 609 | if (temp != slot) { |
| 610 | return -ENODEV; |
| 611 | } |
| 612 | list_del (&slot->slot_list); |
| 613 | |
| 614 | fs_remove_slot (slot); |
| 615 | dbg ("Removed slot %s from the list\n", slot->name); |
| 616 | kobject_unregister(&slot->kobj); |
| 617 | return 0; |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * pci_hp_change_slot_info - changes the slot's information structure in the core |
| 622 | * @slot: pointer to the slot whose info has changed |
| 623 | * @info: pointer to the info copy into the slot's info structure |
| 624 | * |
| 625 | * @slot must have been registered with the pci |
| 626 | * hotplug subsystem previously with a call to pci_hp_register(). |
| 627 | * |
| 628 | * Returns 0 if successful, anything else for an error. |
| 629 | */ |
| 630 | int pci_hp_change_slot_info (struct hotplug_slot *slot, struct hotplug_slot_info *info) |
| 631 | { |
| 632 | if ((slot == NULL) || (info == NULL)) |
| 633 | return -ENODEV; |
| 634 | |
| 635 | /* |
| 636 | * check all fields in the info structure, and update timestamps |
| 637 | * for the files referring to the fields that have now changed. |
| 638 | */ |
| 639 | if ((has_power_file(slot) == 0) && |
| 640 | (slot->info->power_status != info->power_status)) |
| 641 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_power.attr); |
| 642 | |
| 643 | if ((has_attention_file(slot) == 0) && |
| 644 | (slot->info->attention_status != info->attention_status)) |
| 645 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_attention.attr); |
| 646 | |
| 647 | if ((has_latch_file(slot) == 0) && |
| 648 | (slot->info->latch_status != info->latch_status)) |
| 649 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_latch.attr); |
| 650 | |
| 651 | if ((has_adapter_file(slot) == 0) && |
| 652 | (slot->info->adapter_status != info->adapter_status)) |
| 653 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_presence.attr); |
| 654 | |
| 655 | if ((has_address_file(slot) == 0) && |
| 656 | (slot->info->address != info->address)) |
| 657 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_address.attr); |
| 658 | |
| 659 | if ((has_max_bus_speed_file(slot) == 0) && |
| 660 | (slot->info->max_bus_speed != info->max_bus_speed)) |
| 661 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr); |
| 662 | |
| 663 | if ((has_cur_bus_speed_file(slot) == 0) && |
| 664 | (slot->info->cur_bus_speed != info->cur_bus_speed)) |
| 665 | sysfs_update_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr); |
| 666 | |
| 667 | memcpy (slot->info, info, sizeof (struct hotplug_slot_info)); |
| 668 | |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | static int __init pci_hotplug_init (void) |
| 673 | { |
| 674 | int result; |
| 675 | |
| 676 | kset_set_kset_s(&pci_hotplug_slots_subsys, pci_bus_type.subsys); |
| 677 | result = subsystem_register(&pci_hotplug_slots_subsys); |
| 678 | if (result) { |
| 679 | err("Register subsys with error %d\n", result); |
| 680 | goto exit; |
| 681 | } |
| 682 | result = cpci_hotplug_init(debug); |
| 683 | if (result) { |
| 684 | err ("cpci_hotplug_init with error %d\n", result); |
| 685 | goto err_subsys; |
| 686 | } |
| 687 | |
| 688 | info (DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
| 689 | goto exit; |
| 690 | |
| 691 | err_subsys: |
| 692 | subsystem_unregister(&pci_hotplug_slots_subsys); |
| 693 | exit: |
| 694 | return result; |
| 695 | } |
| 696 | |
| 697 | static void __exit pci_hotplug_exit (void) |
| 698 | { |
| 699 | cpci_hotplug_exit(); |
| 700 | subsystem_unregister(&pci_hotplug_slots_subsys); |
| 701 | } |
| 702 | |
| 703 | module_init(pci_hotplug_init); |
| 704 | module_exit(pci_hotplug_exit); |
| 705 | |
| 706 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 707 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 708 | MODULE_LICENSE("GPL"); |
| 709 | module_param(debug, bool, 0644); |
| 710 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); |
| 711 | |
| 712 | EXPORT_SYMBOL_GPL(pci_hotplug_slots_subsys); |
| 713 | EXPORT_SYMBOL_GPL(pci_hp_register); |
| 714 | EXPORT_SYMBOL_GPL(pci_hp_deregister); |
| 715 | EXPORT_SYMBOL_GPL(pci_hp_change_slot_info); |