drivers/char/ipmi/ipmi_poweroff.c

   1 /*
   2  * ipmi_poweroff.c
   3  *
   4  * MontaVista IPMI Poweroff extension to sys_reboot
   5  *
   6  * Author: MontaVista Software, Inc.
   7  *         Steven Dake <sdake@mvista.com>
   8  *         Corey Minyard <cminyard@mvista.com>
   9  *         source@mvista.com
  10  *
  11  * Copyright 2002,2004 MontaVista Software Inc.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify it
  14  *  under the terms of the GNU General Public License as published by the
  15  *  Free Software Foundation; either version 2 of the License, or (at your
  16  *  option) any later version.
  17  *
  18  *
  19  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  25  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  27  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  28  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  *  You should have received a copy of the GNU General Public License along
  31  *  with this program; if not, write to the Free Software Foundation, Inc.,
  32  *  675 Mass Ave, Cambridge, MA 02139, USA.
  33  */
  34 #include <linux/config.h>
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/string.h>
  39 #include <linux/completion.h>
  40 #include <linux/kdev_t.h>
  41 #include <linux/ipmi.h>
  42 #include <linux/ipmi_smi.h>
  43
  44 #define PFX "IPMI poweroff: "
  45
  46 /* Where to we insert our poweroff function? */
  47 extern void (*pm_power_off)(void);
  48
  49 /* Definitions for controlling power off (if the system supports it).  It
  50  * conveniently matches the IPMI chassis control values. */
  51 #define IPMI_CHASSIS_POWER_DOWN         0       /* power down, the default. */
  52 #define IPMI_CHASSIS_POWER_CYCLE        0x02    /* power cycle */
  53
  54 /* the IPMI data command */
  55 static int poweroff_powercycle;
  56
  57 /* parameter definition to allow user to flag power cycle */
  58 module_param(poweroff_powercycle, int, 0644);
  59 MODULE_PARM_DESC(poweroff_powercycle, " Set to non-zero to enable power cycle instead of power down. Power cycle is contingent on hardware support, otherwise it defaults back to power down.");
  60
  61 /* Stuff from the get device id command. */
  62 static unsigned int mfg_id;
  63 static unsigned int prod_id;
  64 static unsigned char capabilities;
  65 static unsigned char ipmi_version;
  66
  67 /* We use our own messages for this operation, we don't let the system
  68    allocate them, since we may be in a panic situation.  The whole
  69    thing is single-threaded, anyway, so multiple messages are not
  70    required. */
  71 static void dummy_smi_free(struct ipmi_smi_msg *msg)
  72 {
  73 }
  74 static void dummy_recv_free(struct ipmi_recv_msg *msg)
  75 {
  76 }
  77 static struct ipmi_smi_msg halt_smi_msg =
  78 {
  79         .done = dummy_smi_free
  80 };
  81 static struct ipmi_recv_msg halt_recv_msg =
  82 {
  83         .done = dummy_recv_free
  84 };
  85
  86
  87 /*
  88  * Code to send a message and wait for the reponse.
  89  */
  90
  91 static void receive_handler(struct ipmi_recv_msg *recv_msg, void *handler_data)
  92 {
  93         struct completion *comp = recv_msg->user_msg_data;
  94
  95         if (comp)
  96                 complete(comp);
  97 }
  98
  99 static struct ipmi_user_hndl ipmi_poweroff_handler =
 100 {
 101         .ipmi_recv_hndl = receive_handler
 102 };
 103
 104
 105 static int ipmi_request_wait_for_response(ipmi_user_t            user,
 106                                           struct ipmi_addr       *addr,
 107                                           struct kernel_ipmi_msg *send_msg)
 108 {
 109         int               rv;
 110         struct completion comp;
 111
 112         init_completion(&comp);
 113
 114         rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, &comp,
 115                                       &halt_smi_msg, &halt_recv_msg, 0);
 116         if (rv)
 117                 return rv;
 118
 119         wait_for_completion(&comp);
 120
 121         return halt_recv_msg.msg.data[0];
 122 }
 123
 124 /* We are in run-to-completion mode, no completion is desired. */
 125 static int ipmi_request_in_rc_mode(ipmi_user_t            user,
 126                                    struct ipmi_addr       *addr,
 127                                    struct kernel_ipmi_msg *send_msg)
 128 {
 129         int rv;
 130
 131         rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, NULL,
 132                                       &halt_smi_msg, &halt_recv_msg, 0);
 133         if (rv)
 134                 return rv;
 135
 136         return halt_recv_msg.msg.data[0];
 137 }
 138
 139 /*
 140  * ATCA Support
 141  */
 142
 143 #define IPMI_NETFN_ATCA                 0x2c
 144 #define IPMI_ATCA_SET_POWER_CMD         0x11
 145 #define IPMI_ATCA_GET_ADDR_INFO_CMD     0x01
 146 #define IPMI_PICMG_ID                   0
 147
 148 static int ipmi_atca_detect (ipmi_user_t user)
 149 {
 150         struct ipmi_system_interface_addr smi_addr;
 151         struct kernel_ipmi_msg            send_msg;
 152         int                               rv;
 153         unsigned char                     data[1];
 154
 155         /*
 156          * Configure IPMI address for local access
 157          */
 158         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 159         smi_addr.channel = IPMI_BMC_CHANNEL;
 160         smi_addr.lun = 0;
 161
 162         /*
 163          * Use get address info to check and see if we are ATCA
 164          */
 165         send_msg.netfn = IPMI_NETFN_ATCA;
 166         send_msg.cmd = IPMI_ATCA_GET_ADDR_INFO_CMD;
 167         data[0] = IPMI_PICMG_ID;
 168         send_msg.data = data;
 169         send_msg.data_len = sizeof(data);
 170         rv = ipmi_request_wait_for_response(user,
 171                                             (struct ipmi_addr *) &smi_addr,
 172                                             &send_msg);
 173         return !rv;
 174 }
 175
 176 static void ipmi_poweroff_atca (ipmi_user_t user)
 177 {
 178         struct ipmi_system_interface_addr smi_addr;
 179         struct kernel_ipmi_msg            send_msg;
 180         int                               rv;
 181         unsigned char                     data[4];
 182
 183         /*
 184          * Configure IPMI address for local access
 185          */
 186         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 187         smi_addr.channel = IPMI_BMC_CHANNEL;
 188         smi_addr.lun = 0;
 189
 190         printk(KERN_INFO PFX "Powering down via ATCA power command\n");
 191
 192         /*
 193          * Power down
 194          */
 195         send_msg.netfn = IPMI_NETFN_ATCA;
 196         send_msg.cmd = IPMI_ATCA_SET_POWER_CMD;
 197         data[0] = IPMI_PICMG_ID;
 198         data[1] = 0; /* FRU id */
 199         data[2] = 0; /* Power Level */
 200         data[3] = 0; /* Don't change saved presets */
 201         send_msg.data = data;
 202         send_msg.data_len = sizeof (data);
 203         rv = ipmi_request_in_rc_mode(user,
 204                                      (struct ipmi_addr *) &smi_addr,
 205                                      &send_msg);
 206         if (rv) {
 207                 printk(KERN_ERR PFX "Unable to send ATCA powerdown message,"
 208                        " IPMI error 0x%x\n", rv);
 209                 goto out;
 210         }
 211
 212  out:
 213         return;
 214 }
 215
 216 /*
 217  * CPI1 Support
 218  */
 219
 220 #define IPMI_NETFN_OEM_1                                0xf8
 221 #define OEM_GRP_CMD_SET_RESET_STATE             0x84
 222 #define OEM_GRP_CMD_SET_POWER_STATE             0x82
 223 #define IPMI_NETFN_OEM_8                                0xf8
 224 #define OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL        0x80
 225 #define OEM_GRP_CMD_GET_SLOT_GA                 0xa3
 226 #define IPMI_NETFN_SENSOR_EVT                   0x10
 227 #define IPMI_CMD_GET_EVENT_RECEIVER             0x01
 228
 229 #define IPMI_CPI1_PRODUCT_ID            0x000157
 230 #define IPMI_CPI1_MANUFACTURER_ID       0x0108
 231
 232 static int ipmi_cpi1_detect (ipmi_user_t user)
 233 {
 234         return ((mfg_id == IPMI_CPI1_MANUFACTURER_ID)
 235                 && (prod_id == IPMI_CPI1_PRODUCT_ID));
 236 }
 237
 238 static void ipmi_poweroff_cpi1 (ipmi_user_t user)
 239 {
 240         struct ipmi_system_interface_addr smi_addr;
 241         struct ipmi_ipmb_addr             ipmb_addr;
 242         struct kernel_ipmi_msg            send_msg;
 243         int                               rv;
 244         unsigned char                     data[1];
 245         int                               slot;
 246         unsigned char                     hotswap_ipmb;
 247         unsigned char                     aer_addr;
 248         unsigned char                     aer_lun;
 249
 250         /*
 251          * Configure IPMI address for local access
 252          */
 253         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 254         smi_addr.channel = IPMI_BMC_CHANNEL;
 255         smi_addr.lun = 0;
 256
 257         printk(KERN_INFO PFX "Powering down via CPI1 power command\n");
 258
 259         /*
 260          * Get IPMI ipmb address
 261          */
 262         send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
 263         send_msg.cmd = OEM_GRP_CMD_GET_SLOT_GA;
 264         send_msg.data = NULL;
 265         send_msg.data_len = 0;
 266         rv = ipmi_request_in_rc_mode(user,
 267                                      (struct ipmi_addr *) &smi_addr,
 268                                      &send_msg);
 269         if (rv)
 270                 goto out;
 271         slot = halt_recv_msg.msg.data[1];
 272         hotswap_ipmb = (slot > 9) ? (0xb0 + 2 * slot) : (0xae + 2 * slot);
 273
 274         /*
 275          * Get active event receiver
 276          */
 277         send_msg.netfn = IPMI_NETFN_SENSOR_EVT >> 2;
 278         send_msg.cmd = IPMI_CMD_GET_EVENT_RECEIVER;
 279         send_msg.data = NULL;
 280         send_msg.data_len = 0;
 281         rv = ipmi_request_in_rc_mode(user,
 282                                      (struct ipmi_addr *) &smi_addr,
 283                                      &send_msg);
 284         if (rv)
 285                 goto out;
 286         aer_addr = halt_recv_msg.msg.data[1];
 287         aer_lun = halt_recv_msg.msg.data[2];
 288
 289         /*
 290          * Setup IPMB address target instead of local target
 291          */
 292         ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
 293         ipmb_addr.channel = 0;
 294         ipmb_addr.slave_addr = aer_addr;
 295         ipmb_addr.lun = aer_lun;
 296
 297         /*
 298          * Send request hotswap control to remove blade from dpv
 299          */
 300         send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
 301         send_msg.cmd = OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL;
 302         send_msg.data = &hotswap_ipmb;
 303         send_msg.data_len = 1;
 304         ipmi_request_in_rc_mode(user,
 305                                 (struct ipmi_addr *) &ipmb_addr,
 306                                 &send_msg);
 307
 308         /*
 309          * Set reset asserted
 310          */
 311         send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
 312         send_msg.cmd = OEM_GRP_CMD_SET_RESET_STATE;
 313         send_msg.data = data;
 314         data[0] = 1; /* Reset asserted state */
 315         send_msg.data_len = 1;
 316         rv = ipmi_request_in_rc_mode(user,
 317                                      (struct ipmi_addr *) &smi_addr,
 318                                      &send_msg);
 319         if (rv)
 320                 goto out;
 321
 322         /*
 323          * Power down
 324          */
 325         send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
 326         send_msg.cmd = OEM_GRP_CMD_SET_POWER_STATE;
 327         send_msg.data = data;
 328         data[0] = 1; /* Power down state */
 329         send_msg.data_len = 1;
 330         rv = ipmi_request_in_rc_mode(user,
 331                                      (struct ipmi_addr *) &smi_addr,
 332                                      &send_msg);
 333         if (rv)
 334                 goto out;
 335
 336  out:
 337         return;
 338 }
 339
 340 /*
 341  * ipmi_dell_chassis_detect()
 342  * Dell systems with IPMI < 1.5 don't set the chassis capability bit
 343  * but they can handle a chassis poweroff or powercycle command.
 344  */
 345
 346 #define DELL_IANA_MFR_ID {0xA2, 0x02, 0x00}
 347 static int ipmi_dell_chassis_detect (ipmi_user_t user)
 348 {
 349         const char ipmi_version_major = ipmi_version & 0xF;
 350         const char ipmi_version_minor = (ipmi_version >> 4) & 0xF;
 351         const char mfr[3]=DELL_IANA_MFR_ID;
 352         if (!memcmp(mfr, &mfg_id, sizeof(mfr)) &&
 353             ipmi_version_major <= 1 &&
 354             ipmi_version_minor < 5)
 355                 return 1;
 356         return 0;
 357 }
 358
 359 /*
 360  * Standard chassis support
 361  */
 362
 363 #define IPMI_NETFN_CHASSIS_REQUEST      0
 364 #define IPMI_CHASSIS_CONTROL_CMD        0x02
 365
 366 static int ipmi_chassis_detect (ipmi_user_t user)
 367 {
 368         /* Chassis support, use it. */
 369         return (capabilities & 0x80);
 370 }
 371
 372 static void ipmi_poweroff_chassis (ipmi_user_t user)
 373 {
 374         struct ipmi_system_interface_addr smi_addr;
 375         struct kernel_ipmi_msg            send_msg;
 376         int                               rv;
 377         unsigned char                     data[1];
 378
 379         /*
 380          * Configure IPMI address for local access
 381          */
 382         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 383         smi_addr.channel = IPMI_BMC_CHANNEL;
 384         smi_addr.lun = 0;
 385
 386  powercyclefailed:
 387         printk(KERN_INFO PFX "Powering %s via IPMI chassis control command\n",
 388                 (poweroff_powercycle ? "cycle" : "down"));
 389
 390         /*
 391          * Power down
 392          */
 393         send_msg.netfn = IPMI_NETFN_CHASSIS_REQUEST;
 394         send_msg.cmd = IPMI_CHASSIS_CONTROL_CMD;
 395         if (poweroff_powercycle)
 396                 data[0] = IPMI_CHASSIS_POWER_CYCLE;
 397         else
 398                 data[0] = IPMI_CHASSIS_POWER_DOWN;
 399         send_msg.data = data;
 400         send_msg.data_len = sizeof(data);
 401         rv = ipmi_request_in_rc_mode(user,
 402                                      (struct ipmi_addr *) &smi_addr,
 403                                      &send_msg);
 404         if (rv) {
 405                 if (poweroff_powercycle) {
 406                         /* power cycle failed, default to power down */
 407                         printk(KERN_ERR PFX "Unable to send chassis power " \
 408                                "cycle message, IPMI error 0x%x\n", rv);
 409                         poweroff_powercycle = 0;
 410                         goto powercyclefailed;
 411                 }
 412
 413                 printk(KERN_ERR PFX "Unable to send chassis power " \
 414                        "down message, IPMI error 0x%x\n", rv);
 415         }
 416 }
 417
 418
 419 /* Table of possible power off functions. */
 420 struct poweroff_function {
 421         char *platform_type;
 422         int  (*detect)(ipmi_user_t user);
 423         void (*poweroff_func)(ipmi_user_t user);
 424 };
 425
 426 static struct poweroff_function poweroff_functions[] = {
 427         { .platform_type        = "ATCA",
 428           .detect               = ipmi_atca_detect,
 429           .poweroff_func        = ipmi_poweroff_atca },
 430         { .platform_type        = "CPI1",
 431           .detect               = ipmi_cpi1_detect,
 432           .poweroff_func        = ipmi_poweroff_cpi1 },
 433         { .platform_type        = "chassis",
 434           .detect               = ipmi_dell_chassis_detect,
 435           .poweroff_func        = ipmi_poweroff_chassis },
 436         /* Chassis should generally be last, other things should override
 437            it. */
 438         { .platform_type        = "chassis",
 439           .detect               = ipmi_chassis_detect,
 440           .poweroff_func        = ipmi_poweroff_chassis },
 441 };
 442 #define NUM_PO_FUNCS (sizeof(poweroff_functions) \
 443                       / sizeof(struct poweroff_function))
 444
 445
 446 /* Our local state. */
 447 static int ready = 0;
 448 static ipmi_user_t ipmi_user;
 449 static void (*specific_poweroff_func)(ipmi_user_t user) = NULL;
 450
 451 /* Holds the old poweroff function so we can restore it on removal. */
 452 static void (*old_poweroff_func)(void);
 453
 454
 455 /* Called on a powerdown request. */
 456 static void ipmi_poweroff_function (void)
 457 {
 458         if (!ready)
 459                 return;
 460
 461         /* Use run-to-completion mode, since interrupts may be off. */
 462         ipmi_user_set_run_to_completion(ipmi_user, 1);
 463         specific_poweroff_func(ipmi_user);
 464         ipmi_user_set_run_to_completion(ipmi_user, 0);
 465 }
 466
 467 /* Wait for an IPMI interface to be installed, the first one installed
 468    will be grabbed by this code and used to perform the powerdown. */
 469 static void ipmi_po_new_smi(int if_num)
 470 {
 471         struct ipmi_system_interface_addr smi_addr;
 472         struct kernel_ipmi_msg            send_msg;
 473         int                               rv;
 474         int                               i;
 475
 476         if (ready)
 477                 return;
 478
 479         rv = ipmi_create_user(if_num, &ipmi_poweroff_handler, NULL,
 480                               &ipmi_user);
 481         if (rv) {
 482                 printk(KERN_ERR PFX "could not create IPMI user, error %d\n",
 483                        rv);
 484                 return;
 485         }
 486
 487         /*
 488          * Do a get device ide and store some results, since this is
 489          * used by several functions.
 490          */
 491         smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 492         smi_addr.channel = IPMI_BMC_CHANNEL;
 493         smi_addr.lun = 0;
 494
 495         send_msg.netfn = IPMI_NETFN_APP_REQUEST;
 496         send_msg.cmd = IPMI_GET_DEVICE_ID_CMD;
 497         send_msg.data = NULL;
 498         send_msg.data_len = 0;
 499         rv = ipmi_request_wait_for_response(ipmi_user,
 500                                             (struct ipmi_addr *) &smi_addr,
 501                                             &send_msg);
 502         if (rv) {
 503                 printk(KERN_ERR PFX "Unable to send IPMI get device id info,"
 504                        " IPMI error 0x%x\n", rv);
 505                 goto out_err;
 506         }
 507
 508         if (halt_recv_msg.msg.data_len < 12) {
 509                 printk(KERN_ERR PFX "(chassis) IPMI get device id info too,"
 510                        " short, was %d bytes, needed %d bytes\n",
 511                        halt_recv_msg.msg.data_len, 12);
 512                 goto out_err;
 513         }
 514
 515         mfg_id = (halt_recv_msg.msg.data[7]
 516                   | (halt_recv_msg.msg.data[8] << 8)
 517                   | (halt_recv_msg.msg.data[9] << 16));
 518         prod_id = (halt_recv_msg.msg.data[10]
 519                    | (halt_recv_msg.msg.data[11] << 8));
 520         capabilities = halt_recv_msg.msg.data[6];
 521         ipmi_version = halt_recv_msg.msg.data[5];
 522
 523
 524         /* Scan for a poweroff method */
 525         for (i = 0; i < NUM_PO_FUNCS; i++) {
 526                 if (poweroff_functions[i].detect(ipmi_user))
 527                         goto found;
 528         }
 529
 530  out_err:
 531         printk(KERN_ERR PFX "Unable to find a poweroff function that"
 532                " will work, giving up\n");
 533         ipmi_destroy_user(ipmi_user);
 534         return;
 535
 536  found:
 537         printk(KERN_INFO PFX "Found a %s style poweroff function\n",
 538                poweroff_functions[i].platform_type);
 539         specific_poweroff_func = poweroff_functions[i].poweroff_func;
 540         old_poweroff_func = pm_power_off;
 541         pm_power_off = ipmi_poweroff_function;
 542         ready = 1;
 543 }
 544
 545 static void ipmi_po_smi_gone(int if_num)
 546 {
 547         /* This can never be called, because once poweroff driver is
 548            registered, the interface can't go away until the power
 549            driver is unregistered. */
 550 }
 551
 552 static struct ipmi_smi_watcher smi_watcher =
 553 {
 554         .owner    = THIS_MODULE,
 555         .new_smi  = ipmi_po_new_smi,
 556         .smi_gone = ipmi_po_smi_gone
 557 };
 558
 559
 560 #ifdef CONFIG_PROC_FS
 561 #include <linux/sysctl.h>
 562
 563 static ctl_table ipmi_table[] = {
 564         { .ctl_name     = DEV_IPMI_POWEROFF_POWERCYCLE,
 565           .procname     = "poweroff_powercycle",
 566           .data         = &poweroff_powercycle,
 567           .maxlen       = sizeof(poweroff_powercycle),
 568           .mode         = 0644,
 569           .proc_handler = &proc_dointvec },
 570         { }
 571 };
 572
 573 static ctl_table ipmi_dir_table[] = {
 574         { .ctl_name     = DEV_IPMI,
 575           .procname     = "ipmi",
 576           .mode         = 0555,
 577           .child        = ipmi_table },
 578         { }
 579 };
 580
 581 static ctl_table ipmi_root_table[] = {
 582         { .ctl_name     = CTL_DEV,
 583           .procname     = "dev",
 584           .mode         = 0555,
 585           .child        = ipmi_dir_table },
 586         { }
 587 };
 588
 589 static struct ctl_table_header *ipmi_table_header;
 590 #endif /* CONFIG_PROC_FS */
 591
 592 /*
 593  * Startup and shutdown functions.
 594  */
 595 static int ipmi_poweroff_init (void)
 596 {
 597         int rv;
 598
 599         printk ("Copyright (C) 2004 MontaVista Software -"
 600                 " IPMI Powerdown via sys_reboot.\n");
 601
 602         if (poweroff_powercycle)
 603                 printk(KERN_INFO PFX "Power cycle is enabled.\n");
 604
 605 #ifdef CONFIG_PROC_FS
 606         ipmi_table_header = register_sysctl_table(ipmi_root_table, 1);
 607         if (!ipmi_table_header) {
 608                 printk(KERN_ERR PFX "Unable to register powercycle sysctl\n");
 609                 rv = -ENOMEM;
 610                 goto out_err;
 611         }
 612 #endif
 613
 614         rv = ipmi_smi_watcher_register(&smi_watcher);
 615         if (rv) {
 616                 unregister_sysctl_table(ipmi_table_header);
 617                 printk(KERN_ERR PFX "Unable to register SMI watcher: %d\n", rv);
 618                 goto out_err;
 619         }
 620
 621  out_err:
 622         return rv;
 623 }
 624
 625 #ifdef MODULE
 626 static __exit void ipmi_poweroff_cleanup(void)
 627 {
 628         int rv;
 629
 630 #ifdef CONFIG_PROC_FS
 631         unregister_sysctl_table(ipmi_table_header);
 632 #endif
 633
 634         ipmi_smi_watcher_unregister(&smi_watcher);
 635
 636         if (ready) {
 637                 rv = ipmi_destroy_user(ipmi_user);
 638                 if (rv)
 639                         printk(KERN_ERR PFX "could not cleanup the IPMI"
 640                                " user: 0x%x\n", rv);
 641                 pm_power_off = old_poweroff_func;
 642         }
 643 }
 644 module_exit(ipmi_poweroff_cleanup);
 645 #endif
 646
 647 module_init(ipmi_poweroff_init);
 648 MODULE_LICENSE("GPL");
 649 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 650 MODULE_DESCRIPTION("IPMI Poweroff extension to sys_reboot");