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