ipmi_poweroff.c

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/*
 * ipmi_poweroff.c
 *
 * MontaVista IPMI Poweroff extension to sys_reboot
 *
 * Author: MontaVista Software, Inc.
 *         Steven Dake <[email protected]>
 *         Corey Minyard <[email protected]>
 *         [email protected]
 *
 * Copyright 2002,2004 MontaVista Software Inc.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/completion.h>
#include <linux/pm.h>
#include <linux/kdev_t.h>
#include <linux/ipmi.h>
#include <linux/ipmi_smi.h>

#define PFX "IPMI poweroff: "

static void ipmi_po_smi_gone(int if_num);
static void ipmi_po_new_smi(int if_num, struct device *device);

/* Definitions for controlling power off (if the system supports it).  It
 * conveniently matches the IPMI chassis control values. */
#define IPMI_CHASSIS_POWER_DOWN     0   /* power down, the default. */
#define IPMI_CHASSIS_POWER_CYCLE    0x02    /* power cycle */

/* the IPMI data command */
static int poweroff_powercycle;

/* Which interface to use, -1 means the first we see. */
static int ifnum_to_use = -1;

/* Our local state. */
static int ready;
static ipmi_user_t ipmi_user;
static int ipmi_ifnum;
static void (*specific_poweroff_func)(ipmi_user_t user);

/* Holds the old poweroff function so we can restore it on removal. */
static void (*old_poweroff_func)(void);

static int set_param_ifnum(const char *val, struct kernel_param *kp)
{
    int rv = param_set_int(val, kp);
    if (rv)
        return rv;
    if ((ifnum_to_use < 0) || (ifnum_to_use == ipmi_ifnum))
        return 0;

    ipmi_po_smi_gone(ipmi_ifnum);
    ipmi_po_new_smi(ifnum_to_use, NULL);
    return 0;
}

module_param_call(ifnum_to_use, set_param_ifnum, param_get_int,
          &ifnum_to_use, 0644);
MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
         "timer.  Setting to -1 defaults to the first registered "
         "interface");

/* parameter definition to allow user to flag power cycle */
module_param(poweroff_powercycle, int, 0644);
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.");

/* Stuff from the get device id command. */
static unsigned int mfg_id;
static unsigned int prod_id;
static unsigned char capabilities;
static unsigned char ipmi_version;

/*
 * We use our own messages for this operation, we don't let the system
 * allocate them, since we may be in a panic situation.  The whole
 * thing is single-threaded, anyway, so multiple messages are not
 * required.
 */
static atomic_t dummy_count = ATOMIC_INIT(0);
static void dummy_smi_free(struct ipmi_smi_msg *msg)
{
    atomic_dec(&dummy_count);
}
static void dummy_recv_free(struct ipmi_recv_msg *msg)
{
    atomic_dec(&dummy_count);
}
static struct ipmi_smi_msg halt_smi_msg = {
    .done = dummy_smi_free
};
static struct ipmi_recv_msg halt_recv_msg = {
    .done = dummy_recv_free
};


/*
 * Code to send a message and wait for the response.
 */

static void receive_handler(struct ipmi_recv_msg *recv_msg, void *handler_data)
{
    struct completion *comp = recv_msg->user_msg_data;

    if (comp)
        complete(comp);
}

static struct ipmi_user_hndl ipmi_poweroff_handler = {
    .ipmi_recv_hndl = receive_handler
};


static int ipmi_request_wait_for_response(ipmi_user_t            user,
                      struct ipmi_addr       *addr,
                      struct kernel_ipmi_msg *send_msg)
{
    int               rv;
    struct completion comp;

    init_completion(&comp);

    rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, &comp,
                      &halt_smi_msg, &halt_recv_msg, 0);
    if (rv)
        return rv;

    wait_for_completion(&comp);

    return halt_recv_msg.msg.data[0];
}

/* Wait for message to complete, spinning. */
static int ipmi_request_in_rc_mode(ipmi_user_t            user,
                   struct ipmi_addr       *addr,
                   struct kernel_ipmi_msg *send_msg)
{
    int rv;

    atomic_set(&dummy_count, 2);
    rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, NULL,
                      &halt_smi_msg, &halt_recv_msg, 0);
    if (rv) {
        atomic_set(&dummy_count, 0);
        return rv;
    }

    /*
     * Spin until our message is done.
     */
    while (atomic_read(&dummy_count) > 0) {
        ipmi_poll_interface(user);
        cpu_relax();
    }

    return halt_recv_msg.msg.data[0];
}

/*
 * ATCA Support
 */

#define IPMI_NETFN_ATCA         0x2c
#define IPMI_ATCA_SET_POWER_CMD     0x11
#define IPMI_ATCA_GET_ADDR_INFO_CMD 0x01
#define IPMI_PICMG_ID           0

#define IPMI_NETFN_OEM              0x2e
#define IPMI_ATCA_PPS_GRACEFUL_RESTART      0x11
#define IPMI_ATCA_PPS_IANA          "\x00\x40\x0A"
#define IPMI_MOTOROLA_MANUFACTURER_ID       0x0000A1
#define IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID   0x0051

static void (*atca_oem_poweroff_hook)(ipmi_user_t user);

static void pps_poweroff_atca(ipmi_user_t user)
{
    struct ipmi_system_interface_addr smi_addr;
    struct kernel_ipmi_msg            send_msg;
    int                               rv;
    /*
     * Configure IPMI address for local access
     */
    smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
    smi_addr.channel = IPMI_BMC_CHANNEL;
    smi_addr.lun = 0;

    printk(KERN_INFO PFX "PPS powerdown hook used");

    send_msg.netfn = IPMI_NETFN_OEM;
    send_msg.cmd = IPMI_ATCA_PPS_GRACEFUL_RESTART;
    send_msg.data = IPMI_ATCA_PPS_IANA;
    send_msg.data_len = 3;
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
        printk(KERN_ERR PFX "Unable to send ATCA ,"
               " IPMI error 0x%x\n", rv);
    }
    return;
}

static int ipmi_atca_detect(ipmi_user_t user)
{
    struct ipmi_system_interface_addr smi_addr;
    struct kernel_ipmi_msg            send_msg;
    int                               rv;
    unsigned char                     data[1];

    /*
     * Configure IPMI address for local access
     */
    smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
    smi_addr.channel = IPMI_BMC_CHANNEL;
    smi_addr.lun = 0;

    /*
     * Use get address info to check and see if we are ATCA
     */
    send_msg.netfn = IPMI_NETFN_ATCA;
    send_msg.cmd = IPMI_ATCA_GET_ADDR_INFO_CMD;
    data[0] = IPMI_PICMG_ID;
    send_msg.data = data;
    send_msg.data_len = sizeof(data);
    rv = ipmi_request_wait_for_response(user,
                        (struct ipmi_addr *) &smi_addr,
                        &send_msg);

    printk(KERN_INFO PFX "ATCA Detect mfg 0x%X prod 0x%X\n",
           mfg_id, prod_id);
    if ((mfg_id == IPMI_MOTOROLA_MANUFACTURER_ID)
        && (prod_id == IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID)) {
        printk(KERN_INFO PFX
               "Installing Pigeon Point Systems Poweroff Hook\n");
        atca_oem_poweroff_hook = pps_poweroff_atca;
    }
    return !rv;
}

static void ipmi_poweroff_atca(ipmi_user_t user)
{
    struct ipmi_system_interface_addr smi_addr;
    struct kernel_ipmi_msg            send_msg;
    int                               rv;
    unsigned char                     data[4];

    /*
     * Configure IPMI address for local access
     */
    smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
    smi_addr.channel = IPMI_BMC_CHANNEL;
    smi_addr.lun = 0;

    printk(KERN_INFO PFX "Powering down via ATCA power command\n");

    /*
     * Power down
     */
    send_msg.netfn = IPMI_NETFN_ATCA;
    send_msg.cmd = IPMI_ATCA_SET_POWER_CMD;
    data[0] = IPMI_PICMG_ID;
    data[1] = 0; /* FRU id */
    data[2] = 0; /* Power Level */
    data[3] = 0; /* Don't change saved presets */
    send_msg.data = data;
    send_msg.data_len = sizeof(data);
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    /*
     * At this point, the system may be shutting down, and most
     * serial drivers (if used) will have interrupts turned off
     * it may be better to ignore IPMI_UNKNOWN_ERR_COMPLETION_CODE
     * return code
     */
    if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE) {
        printk(KERN_ERR PFX "Unable to send ATCA powerdown message,"
               " IPMI error 0x%x\n", rv);
        goto out;
    }

    if (atca_oem_poweroff_hook)
        atca_oem_poweroff_hook(user);
 out:
    return;
}

/*
 * CPI1 Support
 */

#define IPMI_NETFN_OEM_1                0xf8
#define OEM_GRP_CMD_SET_RESET_STATE     0x84
#define OEM_GRP_CMD_SET_POWER_STATE     0x82
#define IPMI_NETFN_OEM_8                0xf8
#define OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL    0x80
#define OEM_GRP_CMD_GET_SLOT_GA         0xa3
#define IPMI_NETFN_SENSOR_EVT           0x10
#define IPMI_CMD_GET_EVENT_RECEIVER     0x01

#define IPMI_CPI1_PRODUCT_ID        0x000157
#define IPMI_CPI1_MANUFACTURER_ID   0x0108

static int ipmi_cpi1_detect(ipmi_user_t user)
{
    return ((mfg_id == IPMI_CPI1_MANUFACTURER_ID)
        && (prod_id == IPMI_CPI1_PRODUCT_ID));
}

static void ipmi_poweroff_cpi1(ipmi_user_t user)
{
    struct ipmi_system_interface_addr smi_addr;
    struct ipmi_ipmb_addr             ipmb_addr;
    struct kernel_ipmi_msg            send_msg;
    int                               rv;
    unsigned char                     data[1];
    int                               slot;
    unsigned char                     hotswap_ipmb;
    unsigned char                     aer_addr;
    unsigned char                     aer_lun;

    /*
     * Configure IPMI address for local access
     */
    smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
    smi_addr.channel = IPMI_BMC_CHANNEL;
    smi_addr.lun = 0;

    printk(KERN_INFO PFX "Powering down via CPI1 power command\n");

    /*
     * Get IPMI ipmb address
     */
    send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
    send_msg.cmd = OEM_GRP_CMD_GET_SLOT_GA;
    send_msg.data = NULL;
    send_msg.data_len = 0;
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    if (rv)
        goto out;
    slot = halt_recv_msg.msg.data[1];
    hotswap_ipmb = (slot > 9) ? (0xb0 + 2 * slot) : (0xae + 2 * slot);

    /*
     * Get active event receiver
     */
    send_msg.netfn = IPMI_NETFN_SENSOR_EVT >> 2;
    send_msg.cmd = IPMI_CMD_GET_EVENT_RECEIVER;
    send_msg.data = NULL;
    send_msg.data_len = 0;
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    if (rv)
        goto out;
    aer_addr = halt_recv_msg.msg.data[1];
    aer_lun = halt_recv_msg.msg.data[2];

    /*
     * Setup IPMB address target instead of local target
     */
    ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
    ipmb_addr.channel = 0;
    ipmb_addr.slave_addr = aer_addr;
    ipmb_addr.lun = aer_lun;

    /*
     * Send request hotswap control to remove blade from dpv
     */
    send_msg.netfn = IPMI_NETFN_OEM_8 >> 2;
    send_msg.cmd = OEM_GRP_CMD_REQUEST_HOTSWAP_CTRL;
    send_msg.data = &hotswap_ipmb;
    send_msg.data_len = 1;
    ipmi_request_in_rc_mode(user,
                (struct ipmi_addr *) &ipmb_addr,
                &send_msg);

    /*
     * Set reset asserted
     */
    send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
    send_msg.cmd = OEM_GRP_CMD_SET_RESET_STATE;
    send_msg.data = data;
    data[0] = 1; /* Reset asserted state */
    send_msg.data_len = 1;
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    if (rv)
        goto out;

    /*
     * Power down
     */
    send_msg.netfn = IPMI_NETFN_OEM_1 >> 2;
    send_msg.cmd = OEM_GRP_CMD_SET_POWER_STATE;
    send_msg.data = data;
    data[0] = 1; /* Power down state */
    send_msg.data_len = 1;
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    if (rv)
        goto out;

 out:
    return;
}

/*
 * ipmi_dell_chassis_detect()
 * Dell systems with IPMI < 1.5 don't set the chassis capability bit
 * but they can handle a chassis poweroff or powercycle command.
 */

#define DELL_IANA_MFR_ID {0xA2, 0x02, 0x00}
static int ipmi_dell_chassis_detect(ipmi_user_t user)
{
    const char ipmi_version_major = ipmi_version & 0xF;
    const char ipmi_version_minor = (ipmi_version >> 4) & 0xF;
    const char mfr[3] = DELL_IANA_MFR_ID;
    if (!memcmp(mfr, &mfg_id, sizeof(mfr)) &&
        ipmi_version_major <= 1 &&
        ipmi_version_minor < 5)
        return 1;
    return 0;
}

/*
 * Standard chassis support
 */

#define IPMI_NETFN_CHASSIS_REQUEST  0
#define IPMI_CHASSIS_CONTROL_CMD    0x02

static int ipmi_chassis_detect(ipmi_user_t user)
{
    /* Chassis support, use it. */
    return (capabilities & 0x80);
}

static void ipmi_poweroff_chassis(ipmi_user_t user)
{
    struct ipmi_system_interface_addr smi_addr;
    struct kernel_ipmi_msg            send_msg;
    int                               rv;
    unsigned char                     data[1];

    /*
     * Configure IPMI address for local access
     */
    smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
    smi_addr.channel = IPMI_BMC_CHANNEL;
    smi_addr.lun = 0;

 powercyclefailed:
    printk(KERN_INFO PFX "Powering %s via IPMI chassis control command\n",
        (poweroff_powercycle ? "cycle" : "down"));

    /*
     * Power down
     */
    send_msg.netfn = IPMI_NETFN_CHASSIS_REQUEST;
    send_msg.cmd = IPMI_CHASSIS_CONTROL_CMD;
    if (poweroff_powercycle)
        data[0] = IPMI_CHASSIS_POWER_CYCLE;
    else
        data[0] = IPMI_CHASSIS_POWER_DOWN;
    send_msg.data = data;
    send_msg.data_len = sizeof(data);
    rv = ipmi_request_in_rc_mode(user,
                     (struct ipmi_addr *) &smi_addr,
                     &send_msg);
    if (rv) {
        if (poweroff_powercycle) {
            /* power cycle failed, default to power down */
            printk(KERN_ERR PFX "Unable to send chassis power " \
                   "cycle message, IPMI error 0x%x\n", rv);
            poweroff_powercycle = 0;
            goto powercyclefailed;
        }

        printk(KERN_ERR PFX "Unable to send chassis power " \
               "down message, IPMI error 0x%x\n", rv);
    }
}


/* Table of possible power off functions. */
struct poweroff_function {
    char *platform_type;
    int  (*detect)(ipmi_user_t user);
    void (*poweroff_func)(ipmi_user_t user);
};

static struct poweroff_function poweroff_functions[] = {
    { .platform_type    = "ATCA",
      .detect       = ipmi_atca_detect,
      .poweroff_func    = ipmi_poweroff_atca },
    { .platform_type    = "CPI1",
      .detect       = ipmi_cpi1_detect,
      .poweroff_func    = ipmi_poweroff_cpi1 },
    { .platform_type    = "chassis",
      .detect       = ipmi_dell_chassis_detect,
      .poweroff_func    = ipmi_poweroff_chassis },
    /* Chassis should generally be last, other things should override
       it. */
    { .platform_type    = "chassis",
      .detect       = ipmi_chassis_detect,
      .poweroff_func    = ipmi_poweroff_chassis },
};
#define NUM_PO_FUNCS (sizeof(poweroff_functions) \
              / sizeof(struct poweroff_function))


/* Called on a powerdown request. */
static void ipmi_poweroff_function(void)
{
    if (!ready)
        return;

    /* Use run-to-completion mode, since interrupts may be off. */
    specific_poweroff_func(ipmi_user);
}

/* Wait for an IPMI interface to be installed, the first one installed
   will be grabbed by this code and used to perform the powerdown. */
static void ipmi_po_new_smi(int if_num, struct device *device)
{
    struct ipmi_system_interface_addr smi_addr;
    struct kernel_ipmi_msg            send_msg;
    int                               rv;
    int                               i;

    if (ready)
        return;

    if ((ifnum_to_use >= 0) && (ifnum_to_use != if_num))
        return;

    rv = ipmi_create_user(if_num, &ipmi_poweroff_handler, NULL,
                  &ipmi_user);
    if (rv) {
        printk(KERN_ERR PFX "could not create IPMI user, error %d\n",
               rv);
        return;
    }

    ipmi_ifnum = if_num;

    /*
     * Do a get device ide and store some results, since this is
     * used by several functions.
     */
    smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
    smi_addr.channel = IPMI_BMC_CHANNEL;
    smi_addr.lun = 0;

    send_msg.netfn = IPMI_NETFN_APP_REQUEST;
    send_msg.cmd = IPMI_GET_DEVICE_ID_CMD;
    send_msg.data = NULL;
    send_msg.data_len = 0;
    rv = ipmi_request_wait_for_response(ipmi_user,
                        (struct ipmi_addr *) &smi_addr,
                        &send_msg);
    if (rv) {
        printk(KERN_ERR PFX "Unable to send IPMI get device id info,"
               " IPMI error 0x%x\n", rv);
        goto out_err;
    }

    if (halt_recv_msg.msg.data_len < 12) {
        printk(KERN_ERR PFX "(chassis) IPMI get device id info too,"
               " short, was %d bytes, needed %d bytes\n",
               halt_recv_msg.msg.data_len, 12);
        goto out_err;
    }

    mfg_id = (halt_recv_msg.msg.data[7]
          | (halt_recv_msg.msg.data[8] << 8)
          | (halt_recv_msg.msg.data[9] << 16));
    prod_id = (halt_recv_msg.msg.data[10]
           | (halt_recv_msg.msg.data[11] << 8));
    capabilities = halt_recv_msg.msg.data[6];
    ipmi_version = halt_recv_msg.msg.data[5];


    /* Scan for a poweroff method */
    for (i = 0; i < NUM_PO_FUNCS; i++) {
        if (poweroff_functions[i].detect(ipmi_user))
            goto found;
    }

 out_err:
    printk(KERN_ERR PFX "Unable to find a poweroff function that"
           " will work, giving up\n");
    ipmi_destroy_user(ipmi_user);
    return;

 found:
    printk(KERN_INFO PFX "Found a %s style poweroff function\n",
           poweroff_functions[i].platform_type);
    specific_poweroff_func = poweroff_functions[i].poweroff_func;
    old_poweroff_func = pm_power_off;
    pm_power_off = ipmi_poweroff_function;
    ready = 1;
}

static void ipmi_po_smi_gone(int if_num)
{
    if (!ready)
        return;

    if (ipmi_ifnum != if_num)
        return;

    ready = 0;
    ipmi_destroy_user(ipmi_user);
    pm_power_off = old_poweroff_func;
}

static struct ipmi_smi_watcher smi_watcher = {
    .owner    = THIS_MODULE,
    .new_smi  = ipmi_po_new_smi,
    .smi_gone = ipmi_po_smi_gone
};


#ifdef CONFIG_PROC_FS
#include <linux/sysctl.h>

static ctl_table ipmi_table[] = {
    { .procname = "poweroff_powercycle",
      .data     = &poweroff_powercycle,
      .maxlen   = sizeof(poweroff_powercycle),
      .mode     = 0644,
      .proc_handler = proc_dointvec },
    { }
};

static ctl_table ipmi_dir_table[] = {
    { .procname = "ipmi",
      .mode     = 0555,
      .child    = ipmi_table },
    { }
};

static ctl_table ipmi_root_table[] = {
    { .procname = "dev",
      .mode     = 0555,
      .child    = ipmi_dir_table },
    { }
};

static struct ctl_table_header *ipmi_table_header;
#endif /* CONFIG_PROC_FS */

/*
 * Startup and shutdown functions.
 */
static int __init ipmi_poweroff_init(void)
{
    int rv;

    printk(KERN_INFO "Copyright (C) 2004 MontaVista Software -"
           " IPMI Powerdown via sys_reboot.\n");

    if (poweroff_powercycle)
        printk(KERN_INFO PFX "Power cycle is enabled.\n");

#ifdef CONFIG_PROC_FS
    ipmi_table_header = register_sysctl_table(ipmi_root_table);
    if (!ipmi_table_header) {
        printk(KERN_ERR PFX "Unable to register powercycle sysctl\n");
        rv = -ENOMEM;
        goto out_err;
    }
#endif

    rv = ipmi_smi_watcher_register(&smi_watcher);

#ifdef CONFIG_PROC_FS
    if (rv) {
        unregister_sysctl_table(ipmi_table_header);
        printk(KERN_ERR PFX "Unable to register SMI watcher: %d\n", rv);
        goto out_err;
    }

 out_err:
#endif
    return rv;
}

#ifdef MODULE
static void __exit ipmi_poweroff_cleanup(void)
{
    int rv;

#ifdef CONFIG_PROC_FS
    unregister_sysctl_table(ipmi_table_header);
#endif

    ipmi_smi_watcher_unregister(&smi_watcher);

    if (ready) {
        rv = ipmi_destroy_user(ipmi_user);
        if (rv)
            printk(KERN_ERR PFX "could not cleanup the IPMI"
                   " user: 0x%x\n", rv);
        pm_power_off = old_poweroff_func;
    }
}
module_exit(ipmi_poweroff_cleanup);
#endif

module_init(ipmi_poweroff_init);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Corey Minyard <[email protected]>");
MODULE_DESCRIPTION("IPMI Poweroff extension to sys_reboot");