/*-
 * Copyright (c) 2006 IronPort Systems Inc. <ambrisko@ironport.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 * $FreeBSD: head/sys/dev/ipmi/ipmi.c 257421 2013-10-31 05:13:53Z glebius $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/wdog.h>
#include <sys/device.h>
#include <sys/devfs.h>

#ifdef LOCAL_MODULE
#include <ipmi.h>
#include <ipmivars.h>
#else
#include <sys/ipmi.h>
#include <dev/misc/ipmi/ipmivars.h>
#endif

#ifdef IPMB
static int ipmi_ipmb_checksum(u_char, int);
static int ipmi_ipmb_send_message(device_t, u_char, u_char, u_char,
     u_char, u_char, int)
#endif

static d_ioctl_t ipmi_ioctl;
static d_kqfilter_t ipmi_kqfilter;
static d_open_t ipmi_open;
static d_priv_dtor_t ipmi_dtor;

static void ipmi_filter_detach(struct knote *);
static int ipmi_filter_read(struct knote *, long);

int ipmi_attached = 0;

static int on = 1;
static SYSCTL_NODE(_hw, OID_AUTO, ipmi, CTLFLAG_RD, 0,
    "IPMI driver parameters");
SYSCTL_INT(_hw_ipmi, OID_AUTO, on, CTLFLAG_RW,
        &on, 0, "");

static struct dev_ops ipmi_ops = {
        { "ipmi", 0, D_MPSAFE },
        .d_open =       ipmi_open,
        .d_ioctl =      ipmi_ioctl,
        .d_kqfilter =   ipmi_kqfilter,
};

static int ipmi_watchdog_sysctl_enable(SYSCTL_HANDLER_ARGS);
static int ipmi_watchdog_sysctl_period(SYSCTL_HANDLER_ARGS);

static MALLOC_DEFINE(M_IPMI, "ipmi", "ipmi");

static int
ipmi_open(struct dev_open_args *ap)
{
        struct file *fp = ap->a_fpp ? *ap->a_fpp : NULL;
        cdev_t cdev = ap->a_head.a_dev;
        struct ipmi_device *dev;
        struct ipmi_softc *sc;
        int error;

        if (!on)
                return (ENOENT);

        /* Initialize the per file descriptor data. */
        dev = kmalloc(sizeof(struct ipmi_device), M_IPMI, M_WAITOK | M_ZERO);
        error = devfs_set_cdevpriv(fp, dev, ipmi_dtor);
        if (error) {
                kfree(dev, M_IPMI);
                return (error);
        }

        sc = cdev->si_drv1;
        TAILQ_INIT(&dev->ipmi_completed_requests);
        dev->ipmi_address = IPMI_BMC_SLAVE_ADDR;
        dev->ipmi_lun = IPMI_BMC_SMS_LUN;
        dev->ipmi_softc = sc;
        IPMI_LOCK(sc);
        sc->ipmi_opened++;
        IPMI_UNLOCK(sc);

        return (0);
}

static struct filterops ipmi_filterops = {
        FILTEROP_ISFD | FILTEROP_MPSAFE,
        NULL,
        ipmi_filter_detach,
        ipmi_filter_read
};

static int
ipmi_kqfilter(struct dev_kqfilter_args *ap)
{
        cdev_t cdev = ap->a_head.a_dev;
        struct file *fp = ap->a_fp;
        struct knote *kn = ap->a_kn;
        struct ipmi_softc *sc = cdev->si_drv1;
        struct ipmi_device *dev;
        struct klist *klist;

        ap->a_result = 0;

        switch(kn->kn_filter) {
        case EVFILT_READ:
                if (devfs_get_cdevpriv(fp, (void **)&dev))
                        return EOPNOTSUPP;
                kn->kn_fop = &ipmi_filterops;
                kn->kn_hook = (caddr_t)dev;
                break;
        default:
                ap->a_result = EOPNOTSUPP;
                return (0);
        }

        klist = &sc->ipmi_kq.ki_note;
        knote_insert(klist, kn);

        return (0);
}

static void
ipmi_filter_detach(struct knote *kn)
{
        struct ipmi_device *dev = (struct ipmi_device *)kn->kn_hook;
        struct ipmi_softc *sc = dev->ipmi_softc;
        struct klist *klist;

        klist = &sc->ipmi_kq.ki_note;
        knote_remove(klist, kn);
}

static int
ipmi_filter_read(struct knote *kn, long hint)
{
        struct ipmi_device *dev = (struct ipmi_device *)kn->kn_hook;
        struct ipmi_softc *sc = dev->ipmi_softc;
        int ret = 0;

        IPMI_LOCK(sc);
        if (!TAILQ_EMPTY(&dev->ipmi_completed_requests))
                ret = 1;
        if (dev->ipmi_requests == 0)
                kn->kn_flags |= EV_ERROR;
        IPMI_UNLOCK(sc);

        return (ret);
}

static void
ipmi_purge_completed_requests(struct ipmi_device *dev)
{
        struct ipmi_request *req;

        while (!TAILQ_EMPTY(&dev->ipmi_completed_requests)) {
                req = TAILQ_FIRST(&dev->ipmi_completed_requests);
                TAILQ_REMOVE(&dev->ipmi_completed_requests, req, ir_link);
                dev->ipmi_requests--;
                ipmi_free_request(req);
        }
}

static void
ipmi_dtor(void *arg)
{
        struct ipmi_request *req, *nreq;
        struct ipmi_device *dev;
        struct ipmi_softc *sc;

        dev = arg;
        sc = dev->ipmi_softc;

        IPMI_LOCK(sc);
        if (dev->ipmi_requests) {
                /* Throw away any pending requests for this device. */
                TAILQ_FOREACH_MUTABLE(req, &sc->ipmi_pending_requests, ir_link,
                    nreq) {
                        if (req->ir_owner == dev) {
                                TAILQ_REMOVE(&sc->ipmi_pending_requests, req,
                                    ir_link);
                                dev->ipmi_requests--;
                                ipmi_free_request(req);
                        }
                }

                /* Throw away any pending completed requests for this device. */
                ipmi_purge_completed_requests(dev);

                /*
                 * If we still have outstanding requests, they must be stuck
                 * in an interface driver, so wait for those to drain.
                 */
                dev->ipmi_closing = 1;
                while (dev->ipmi_requests > 0) {
                        lksleep(&dev->ipmi_requests, &sc->ipmi_lock, 0,
                            "ipmidrain", 0);
                        ipmi_purge_completed_requests(dev);
                }
        }
        sc->ipmi_opened--;
        IPMI_UNLOCK(sc);

        /* Cleanup. */
        kfree(dev, M_IPMI);
}

#ifdef IPMB
static int
ipmi_ipmb_checksum(u_char *data, int len)
{
        u_char sum = 0;

        for (; len; len--) {
                sum += *data++;
        }
        return (-sum);
}

/* XXX: Needs work */
static int
ipmi_ipmb_send_message(device_t dev, u_char channel, u_char netfn,
    u_char command, u_char seq, u_char *data, int data_len)
{
        struct ipmi_softc *sc = device_get_softc(dev);
        struct ipmi_request *req;
        u_char slave_addr = 0x52;
        int error;

        req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
            IPMI_SEND_MSG, data_len + 8, 0);
        req->ir_request[0] = channel;
        req->ir_request[1] = slave_addr;
        req->ir_request[2] = IPMI_ADDR(netfn, 0);
        req->ir_request[3] = ipmi_ipmb_checksum(&req->ir_request[1], 2);
        req->ir_request[4] = sc->ipmi_address;
        req->ir_request[5] = IPMI_ADDR(seq, sc->ipmi_lun);
        req->ir_request[6] = command;

        bcopy(data, &req->ir_request[7], data_len);
        temp[data_len + 7] = ipmi_ipmb_checksum(&req->ir_request[4],
            data_len + 3);

        ipmi_submit_driver_request(sc, req);
        error = req->ir_error;
        ipmi_free_request(req);

        return (error);
}

static int
ipmi_handle_attn(struct ipmi_softc *sc)
{
        struct ipmi_request *req;
        int error;

        device_printf(sc->ipmi_dev, "BMC has a message\n");
        req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
            IPMI_GET_MSG_FLAGS, 0, 1);

        ipmi_submit_driver_request(sc, req);

        if (req->ir_error == 0 && req->ir_compcode == 0) {
                if (req->ir_reply[0] & IPMI_MSG_BUFFER_FULL) {
                        device_printf(sc->ipmi_dev, "message buffer full");
                }
                if (req->ir_reply[0] & IPMI_WDT_PRE_TIMEOUT) {
                        device_printf(sc->ipmi_dev,
                            "watchdog about to go off");
                }
                if (req->ir_reply[0] & IPMI_MSG_AVAILABLE) {
                        ipmi_free_request(req);

                        req = ipmi_alloc_driver_request(
                            IPMI_ADDR(IPMI_APP_REQUEST, 0), IPMI_GET_MSG, 0,
                            16);

                        device_printf(sc->ipmi_dev, "throw out message ");
                        dump_buf(temp, 16);
                }
        }
        error = req->ir_error;
        ipmi_free_request(req);

        return (error);
}
#endif

#ifdef IPMICTL_SEND_COMMAND_32
#define PTRIN(p)        ((void *)(uintptr_t)(p))
#define PTROUT(p)       ((uintptr_t)(p))
#endif

static int
ipmi_ioctl(struct dev_ioctl_args *ap)
{
        struct file *fp = ap->a_fp;
        cdev_t cdev = ap->a_head.a_dev;
        u_long cmd = ap->a_cmd;
        caddr_t data = ap->a_data;
        struct ipmi_softc *sc;
        struct ipmi_device *dev;
        struct ipmi_request *kreq;
        struct ipmi_req *req = (struct ipmi_req *)data;
        struct ipmi_recv *recv = (struct ipmi_recv *)data;
        struct ipmi_addr addr;
#ifdef IPMICTL_SEND_COMMAND_32
        struct ipmi_req32 *req32 = (struct ipmi_req32 *)data;
        struct ipmi_recv32 *recv32 = (struct ipmi_recv32 *)data;
        union {
                struct ipmi_req req;
                struct ipmi_recv recv;
        } thunk32;
#endif
        int error, len;

        error = devfs_get_cdevpriv(fp, (void **)&dev);
        if (error)
                return (error);

        sc = cdev->si_drv1;

#ifdef IPMICTL_SEND_COMMAND_32
        /* Convert 32-bit structures to native. */
        switch (cmd) {
        case IPMICTL_SEND_COMMAND_32:
                req = &thunk32.req;
                req->addr = PTRIN(req32->addr);
                req->addr_len = req32->addr_len;
                req->msgid = req32->msgid;
                req->msg.netfn = req32->msg.netfn;
                req->msg.cmd = req32->msg.cmd;
                req->msg.data_len = req32->msg.data_len;
                req->msg.data = PTRIN(req32->msg.data);
                break;
        case IPMICTL_RECEIVE_MSG_TRUNC_32:
        case IPMICTL_RECEIVE_MSG_32:
                recv = &thunk32.recv;
                recv->addr = PTRIN(recv32->addr);
                recv->addr_len = recv32->addr_len;
                recv->msg.data_len = recv32->msg.data_len;
                recv->msg.data = PTRIN(recv32->msg.data);
                break;
        }
#endif

        switch (cmd) {
#ifdef IPMICTL_SEND_COMMAND_32
        case IPMICTL_SEND_COMMAND_32:
#endif
        case IPMICTL_SEND_COMMAND:
                /*
                 * XXX: Need to add proper handling of this.
                 */
                error = copyin(req->addr, &addr, sizeof(addr));
                if (error)
                        return (error);

                IPMI_LOCK(sc);
                /* clear out old stuff in queue of stuff done */
                /* XXX: This seems odd. */
                while ((kreq = TAILQ_FIRST(&dev->ipmi_completed_requests))) {
                        TAILQ_REMOVE(&dev->ipmi_completed_requests, kreq,
                            ir_link);
                        dev->ipmi_requests--;
                        ipmi_free_request(kreq);
                }
                IPMI_UNLOCK(sc);

                kreq = ipmi_alloc_request(dev, req->msgid,
                    IPMI_ADDR(req->msg.netfn, 0), req->msg.cmd,
                    req->msg.data_len, IPMI_MAX_RX);
                error = copyin(req->msg.data, kreq->ir_request,
                    req->msg.data_len);
                if (error) {
                        ipmi_free_request(kreq);
                        return (error);
                }
                IPMI_LOCK(sc);
                dev->ipmi_requests++;
                error = sc->ipmi_enqueue_request(sc, kreq);
                IPMI_UNLOCK(sc);
                if (error)
                        return (error);
                break;
#ifdef IPMICTL_SEND_COMMAND_32
        case IPMICTL_RECEIVE_MSG_TRUNC_32:
        case IPMICTL_RECEIVE_MSG_32:
#endif
        case IPMICTL_RECEIVE_MSG_TRUNC:
        case IPMICTL_RECEIVE_MSG:
                error = copyin(recv->addr, &addr, sizeof(addr));
                if (error)
                        return (error);

                IPMI_LOCK(sc);
                kreq = TAILQ_FIRST(&dev->ipmi_completed_requests);
                if (kreq == NULL) {
                        IPMI_UNLOCK(sc);
                        return (EAGAIN);
                }
                addr.channel = IPMI_BMC_CHANNEL;
                /* XXX */
                recv->recv_type = IPMI_RESPONSE_RECV_TYPE;
                recv->msgid = kreq->ir_msgid;
                recv->msg.netfn = IPMI_REPLY_ADDR(kreq->ir_addr) >> 2;
                recv->msg.cmd = kreq->ir_command;
                error = kreq->ir_error;
                if (error) {
                        TAILQ_REMOVE(&dev->ipmi_completed_requests, kreq,
                            ir_link);
                        dev->ipmi_requests--;
                        IPMI_UNLOCK(sc);
                        ipmi_free_request(kreq);
                        return (error);
                }
                len = kreq->ir_replylen + 1;
                if (recv->msg.data_len < len &&
                    (cmd == IPMICTL_RECEIVE_MSG
#ifdef IPMICTL_RECEIVE_MSG_32
                     || cmd == IPMICTL_RECEIVE_MSG_32
#endif
                    )) {
                        IPMI_UNLOCK(sc);
                        return (EMSGSIZE);
                }
                TAILQ_REMOVE(&dev->ipmi_completed_requests, kreq, ir_link);
                dev->ipmi_requests--;
                IPMI_UNLOCK(sc);
                len = min(recv->msg.data_len, len);
                recv->msg.data_len = len;
                error = copyout(&addr, recv->addr,sizeof(addr));
                if (error == 0)
                        error = copyout(&kreq->ir_compcode, recv->msg.data, 1);
                if (error == 0)
                        error = copyout(kreq->ir_reply, recv->msg.data + 1,
                            len - 1);
                ipmi_free_request(kreq);
                if (error)
                        return (error);
                break;
        case IPMICTL_SET_MY_ADDRESS_CMD:
                IPMI_LOCK(sc);
                dev->ipmi_address = *(int*)data;
                IPMI_UNLOCK(sc);
                break;
        case IPMICTL_GET_MY_ADDRESS_CMD:
                IPMI_LOCK(sc);
                *(int*)data = dev->ipmi_address;
                IPMI_UNLOCK(sc);
                break;
        case IPMICTL_SET_MY_LUN_CMD:
                IPMI_LOCK(sc);
                dev->ipmi_lun = *(int*)data & 0x3;
                IPMI_UNLOCK(sc);
                break;
        case IPMICTL_GET_MY_LUN_CMD:
                IPMI_LOCK(sc);
                *(int*)data = dev->ipmi_lun;
                IPMI_UNLOCK(sc);
                break;
        case IPMICTL_SET_GETS_EVENTS_CMD:
                /*
                device_printf(sc->ipmi_dev,
                    "IPMICTL_SET_GETS_EVENTS_CMD NA\n");
                */
                break;
        case IPMICTL_REGISTER_FOR_CMD:
        case IPMICTL_UNREGISTER_FOR_CMD:
                return (EOPNOTSUPP);
        default:
                device_printf(sc->ipmi_dev, "Unknown IOCTL %lX\n", cmd);
                return (ENOIOCTL);
        }

#ifdef IPMICTL_SEND_COMMAND_32
        /* Update changed fields in 32-bit structures. */
        switch (cmd) {
        case IPMICTL_RECEIVE_MSG_TRUNC_32:
        case IPMICTL_RECEIVE_MSG_32:
                recv32->recv_type = recv->recv_type;
                recv32->msgid = recv->msgid;
                recv32->msg.netfn = recv->msg.netfn;
                recv32->msg.cmd = recv->msg.cmd;
                recv32->msg.data_len = recv->msg.data_len;
                break;
        }
#endif
        return (0);
}

/*
 * Request management.
 */

/* Allocate a new request with request and reply buffers. */
struct ipmi_request *
ipmi_alloc_request(struct ipmi_device *dev, long msgid, uint8_t addr,
    uint8_t command, size_t requestlen, size_t replylen)
{
        struct ipmi_request *req;

        req = kmalloc(sizeof(struct ipmi_request) + requestlen + replylen,
            M_IPMI, M_WAITOK | M_ZERO);
        req->ir_owner = dev;
        req->ir_msgid = msgid;
        req->ir_addr = addr;
        req->ir_command = command;
        if (requestlen) {
                req->ir_request = (char *)&req[1];
                req->ir_requestlen = requestlen;
        }
        if (replylen) {
                req->ir_reply = (char *)&req[1] + requestlen;
                req->ir_replybuflen = replylen;
        }
        return (req);
}

/* Free a request no longer in use. */
void
ipmi_free_request(struct ipmi_request *req)
{

        kfree(req, M_IPMI);
}

/* Store a processed request on the appropriate completion queue. */
void
ipmi_complete_request(struct ipmi_softc *sc, struct ipmi_request *req)
{
        struct ipmi_device *dev;

        IPMI_LOCK_ASSERT(sc);

        /*
         * Anonymous requests (from inside the driver) always have a
         * waiter that we awaken.
         */
        if (req->ir_owner == NULL)
                wakeup(req);
        else {
                dev = req->ir_owner;
                TAILQ_INSERT_TAIL(&dev->ipmi_completed_requests, req, ir_link);
                KNOTE(&sc->ipmi_kq.ki_note, 0);
                if (dev->ipmi_closing)
                        wakeup(&dev->ipmi_requests);
        }
}

/* Enqueue an internal driver request and wait until it is completed. */
int
ipmi_submit_driver_request(struct ipmi_softc *sc, struct ipmi_request *req,
    int timo)
{
        int error;

        IPMI_LOCK(sc);
        error = sc->ipmi_enqueue_request(sc, req);
        if (error == 0)
                error = lksleep(req, &sc->ipmi_lock, 0, "ipmireq", timo);
        if (error == 0)
                error = req->ir_error;
        IPMI_UNLOCK(sc);
        return (error);
}

/*
 * Helper routine for polled system interfaces that use
 * ipmi_polled_enqueue_request() to queue requests.  This request
 * waits until there is a pending request and then returns the first
 * request.  If the driver is shutting down, it returns NULL.
 */
struct ipmi_request *
ipmi_dequeue_request(struct ipmi_softc *sc)
{
        struct ipmi_request *req;

        IPMI_LOCK_ASSERT(sc);

        while (!sc->ipmi_detaching && TAILQ_EMPTY(&sc->ipmi_pending_requests))
                cv_wait(&sc->ipmi_request_added, &sc->ipmi_lock);
        if (sc->ipmi_detaching)
                return (NULL);

        req = TAILQ_FIRST(&sc->ipmi_pending_requests);
        TAILQ_REMOVE(&sc->ipmi_pending_requests, req, ir_link);
        return (req);
}

/* Default implementation of ipmi_enqueue_request() for polled interfaces. */
int
ipmi_polled_enqueue_request(struct ipmi_softc *sc, struct ipmi_request *req)
{
        IPMI_LOCK_ASSERT(sc);

        TAILQ_INSERT_TAIL(&sc->ipmi_pending_requests, req, ir_link);

        cv_signal(&sc->ipmi_request_added);
        return (0);
}

/*
 * Watchdog event handler.
 */
static int
ipmi_set_watchdog(struct ipmi_softc *sc, unsigned int sec)
{
        struct ipmi_request *req;
        int error;

        if (sec > 0xffff / 10)
                return (EINVAL);

        req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
            IPMI_SET_WDOG, 6, 0);

        if (sec) {
                req->ir_request[0] = IPMI_SET_WD_TIMER_DONT_STOP
                    | IPMI_SET_WD_TIMER_SMS_OS;
                req->ir_request[1] = IPMI_SET_WD_ACTION_RESET;
                req->ir_request[2] = 0;
                req->ir_request[3] = 0; /* Timer use */
                req->ir_request[4] = (sec * 10) & 0xff;
                req->ir_request[5] = (sec * 10) >> 8;
        } else {
                req->ir_request[0] = IPMI_SET_WD_TIMER_SMS_OS;
                req->ir_request[1] = 0;
                req->ir_request[2] = 0;
                req->ir_request[3] = 0; /* Timer use */
                req->ir_request[4] = 0;
                req->ir_request[5] = 0;
        }
        error = ipmi_submit_driver_request(sc, req, 0);
        if (error)
                device_printf(sc->ipmi_dev, "Failed to set watchdog\n");
        else if (sec) {
                ipmi_free_request(req);

                req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
                    IPMI_RESET_WDOG, 0, 0);

                error = ipmi_submit_driver_request(sc, req, 0);
                if (error)
                        device_printf(sc->ipmi_dev,
                            "Failed to reset watchdog\n");
        }

        ipmi_free_request(req);
        return (error);
        /*
        dump_watchdog(sc);
        */
}

static void
ipmi_watchdog(void *arg)
{
        struct ipmi_softc *sc = (struct ipmi_softc *)arg;
        int e;

        if(sc->ipmi_wdog_period) {
                e = ipmi_set_watchdog(sc, sc->ipmi_wdog_period + 1);

                if (e == 0)
                        sc->ipmi_watchdog_active = 1;
                else
                        ipmi_set_watchdog(sc, 0);

                callout_reset(&sc->ipmi_watchdog,
                              sc->ipmi_wdog_period * hz,
                              &ipmi_watchdog, (void *)sc);
        }
}

static void
ipmi_startup(void *arg)
{
        struct ipmi_softc *sc = arg;
        struct ipmi_request *req;
        device_t dev;
        int error, i;

        config_intrhook_disestablish(&sc->ipmi_ich);
        dev = sc->ipmi_dev;

        /* Initialize interface-independent state. */
        lockinit(&sc->ipmi_lock, device_get_nameunit(dev), 0, LK_CANRECURSE);
        cv_init(&sc->ipmi_request_added, "ipmireq");
        TAILQ_INIT(&sc->ipmi_pending_requests);

        /* Initialize interface-dependent state. */
        error = sc->ipmi_startup(sc);
        if (error) {
                device_printf(dev, "Failed to initialize interface: %d\n",
                    error);
                return;
        }

        /* Send a GET_DEVICE_ID request. */
        req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
            IPMI_GET_DEVICE_ID, 0, 15);

        error = ipmi_submit_driver_request(sc, req, MAX_TIMEOUT);
        if (error == EWOULDBLOCK) {
                device_printf(dev, "Timed out waiting for GET_DEVICE_ID\n");
                ipmi_free_request(req);
                return;
        } else if (error) {
                device_printf(dev, "Failed GET_DEVICE_ID: %d\n", error);
                ipmi_free_request(req);
                return;
        } else if (req->ir_compcode != 0) {
                device_printf(dev,
                    "Bad completion code for GET_DEVICE_ID: %d\n",
                    req->ir_compcode);
                ipmi_free_request(req);
                return;
        } else if (req->ir_replylen < 5) {
                device_printf(dev, "Short reply for GET_DEVICE_ID: %d\n",
                    req->ir_replylen);
                ipmi_free_request(req);
                return;
        }

        device_printf(dev, "IPMI device rev. %d, firmware rev. %d.%d%d, "
            "version %d.%d\n",
             req->ir_reply[1] & 0x0f,
             req->ir_reply[2] & 0x7f, req->ir_reply[3] >> 4, req->ir_reply[3] & 0x0f,
             req->ir_reply[4] & 0x0f, req->ir_reply[4] >> 4);

        ipmi_free_request(req);

        req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
            IPMI_CLEAR_FLAGS, 1, 0);

        ipmi_submit_driver_request(sc, req, 0);

        /* XXX: Magic numbers */
        if (req->ir_compcode == 0xc0) {
                device_printf(dev, "Clear flags is busy\n");
        }
        if (req->ir_compcode == 0xc1) {
                device_printf(dev, "Clear flags illegal\n");
        }
        ipmi_free_request(req);

        for (i = 0; i < 8; i++) {
                req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
                    IPMI_GET_CHANNEL_INFO, 1, 0);
                req->ir_request[0] = i;

                ipmi_submit_driver_request(sc, req, 0);

                if (req->ir_compcode != 0) {
                        ipmi_free_request(req);
                        break;
                }
                ipmi_free_request(req);
        }
        device_printf(dev, "Number of channels %d\n", i);

        /* probe for watchdog */
        req = ipmi_alloc_driver_request(IPMI_ADDR(IPMI_APP_REQUEST, 0),
            IPMI_GET_WDOG, 0, 0);

        ipmi_submit_driver_request(sc, req, 0);

        if (req->ir_compcode == 0x00) {
                struct sysctl_ctx_list *ctx;
                struct sysctl_oid *tree;
                struct sysctl_oid_list *child;

                device_printf(dev, "Attached watchdog\n");
                /* register the watchdog event handler */
                /* XXX profmakx: our wdog driver holds a spinlock while
                   running the watchdog function, but since the ipmi watchdog
                   function sleeps, this doesn't work. Hack something with
                   a callout */
                callout_init(&sc->ipmi_watchdog);
                sc->ipmi_wdog_enable = 0;
                sc->ipmi_wdog_period = 30;

                ctx = device_get_sysctl_ctx(dev);
                tree = device_get_sysctl_tree(dev);
                child = SYSCTL_CHILDREN(tree);

                SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "watchdog_enable",
                            CTLTYPE_INT | CTLFLAG_RW, sc, 0,
                            ipmi_watchdog_sysctl_enable, "I",
                            "ipmi watchdog enable");
                SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "watchdog_period",
                            CTLTYPE_INT | CTLFLAG_RW, sc, 0,
                            ipmi_watchdog_sysctl_period, "I",
                            "ipmi watchdog period");

        }
        ipmi_free_request(req);

        sc->ipmi_cdev = make_dev(&ipmi_ops, device_get_unit(dev),
            UID_ROOT, GID_OPERATOR, 0660, "ipmi%d", device_get_unit(dev));
        if (sc->ipmi_cdev == NULL) {
                device_printf(dev, "Failed to create cdev\n");
                return;
        }
        sc->ipmi_cdev->si_drv1 = sc;
}

int
ipmi_attach(device_t dev)
{
        struct ipmi_softc *sc = device_get_softc(dev);
        int error;

        if (sc->ipmi_irq_res != NULL && sc->ipmi_intr != NULL) {
                error = bus_setup_intr(dev, sc->ipmi_irq_res, 0,
                    sc->ipmi_intr, sc, &sc->ipmi_irq, NULL);
                if (error) {
                        device_printf(dev, "can't set up interrupt\n");
                        return (error);
                }
        }

        bzero(&sc->ipmi_ich, sizeof(struct intr_config_hook));
        sc->ipmi_ich.ich_func = ipmi_startup;
        sc->ipmi_ich.ich_arg = sc;
        sc->ipmi_ich.ich_desc = "ipmi";
        if (config_intrhook_establish(&sc->ipmi_ich) != 0) {
                device_printf(dev, "can't establish configuration hook\n");
                return (ENOMEM);
        }

        ipmi_attached = 1;
        return (0);
}

int
ipmi_detach(device_t dev)
{
        struct ipmi_softc *sc;

        sc = device_get_softc(dev);

        /* Fail if there are any open handles. */
        IPMI_LOCK(sc);
        if (sc->ipmi_opened) {
                IPMI_UNLOCK(sc);
                return (EBUSY);
        }
        IPMI_UNLOCK(sc);
        if (sc->ipmi_cdev)
                destroy_dev(sc->ipmi_cdev);

        /* Detach from watchdog handling and turn off watchdog. */
        callout_cancel(&sc->ipmi_watchdog);
        ipmi_set_watchdog(sc, 0);

        /* XXX: should use shutdown callout I think. */
        /* If the backend uses a kthread, shut it down. */
        IPMI_LOCK(sc);
        sc->ipmi_detaching = 1;
        if (sc->ipmi_kthread) {
                cv_broadcast(&sc->ipmi_request_added);
                lksleep(sc->ipmi_kthread, &sc->ipmi_lock, 0, "ipmi_wait", 0);
        }
        IPMI_UNLOCK(sc);
        if (sc->ipmi_irq)
                bus_teardown_intr(dev, sc->ipmi_irq_res, sc->ipmi_irq);

        ipmi_release_resources(dev);
        lockuninit(&sc->ipmi_lock);
        return (0);
}

void
ipmi_release_resources(device_t dev)
{
        struct ipmi_softc *sc;
        int i;

        sc = device_get_softc(dev);
        if (sc->ipmi_irq)
                bus_teardown_intr(dev, sc->ipmi_irq_res, sc->ipmi_irq);
        if (sc->ipmi_irq_res)
                bus_release_resource(dev, SYS_RES_IRQ, sc->ipmi_irq_rid,
                    sc->ipmi_irq_res);
        for (i = 0; i < MAX_RES; i++)
                if (sc->ipmi_io_res[i])
                        bus_release_resource(dev, sc->ipmi_io_type,
                            sc->ipmi_io_rid + i, sc->ipmi_io_res[i]);
}

devclass_t ipmi_devclass;

/* XXX: Why? */
static void
ipmi_unload(void *arg)
{
        device_t *      devs;
        int             count;
        int             i;

        if (devclass_get_devices(ipmi_devclass, &devs, &count) != 0)
                return;
        for (i = 0; i < count; i++)
                device_delete_child(device_get_parent(devs[i]), devs[i]);
        kfree(devs, M_TEMP);
}
SYSUNINIT(ipmi_unload, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipmi_unload, NULL);

static int
ipmi_watchdog_sysctl_enable(SYSCTL_HANDLER_ARGS)
{
        struct ipmi_softc *sc;
        int enable;
        int error;

        sc = oidp->oid_arg1;

        IPMI_LOCK(sc);
        enable = sc->ipmi_wdog_enable;
        IPMI_UNLOCK(sc);

        error = sysctl_handle_int(oidp, &enable, 0, req);
        if(error || req->newptr == NULL)
                return error;

        IPMI_LOCK(sc);
        sc->ipmi_wdog_enable = enable;
        IPMI_UNLOCK(sc);

        if (sc->ipmi_wdog_enable==0) {
                callout_stop(&sc->ipmi_watchdog);
                ipmi_set_watchdog(sc, 0);
        } else {
                callout_reset(&sc->ipmi_watchdog,
                              sc->ipmi_wdog_period * hz,
                              &ipmi_watchdog, (void *)sc); 
                ipmi_set_watchdog(sc, sc->ipmi_wdog_period + 1);
        }
        return 0;
}

static int
ipmi_watchdog_sysctl_period(SYSCTL_HANDLER_ARGS)
{
        struct ipmi_softc *sc;
        int error;
        int period;

        sc = oidp->oid_arg1;

        IPMI_LOCK(sc);
        period = sc->ipmi_wdog_period;
        IPMI_UNLOCK(sc);

        error = sysctl_handle_int(oidp, &period, 30, req);

        if (error || req->newptr == NULL)
                return error;

        IPMI_LOCK(sc);
        sc->ipmi_wdog_period = period;
        IPMI_UNLOCK(sc);

        return 0;
}

#ifdef IMPI_DEBUG
static void
dump_buf(u_char *data, int len)
{
        char buf[20];
        char line[1024];
        char temp[30];
        int count = 0;
        int i=0;

        printf("Address %p len %d\n", data, len);
        if (len > 256)
                len = 256;
        line[0] = '\000';
        for (; len > 0; len--, data++) {
                sprintf(temp, "%02x ", *data);
                strcat(line, temp);
                if (*data >= ' ' && *data <= '~')
                        buf[count] = *data;
                else if (*data >= 'A' && *data <= 'Z')
                        buf[count] = *data;
                else
                        buf[count] = '.';
                if (++count == 16) {
                        buf[count] = '\000';
                        count = 0;
                        printf("  %3x  %s %s\n", i, line, buf);
                        i+=16;
                        line[0] = '\000';
                }
        }
        buf[count] = '\000';

        for (; count != 16; count++) {
                strcat(line, "   ");
        }
        printf("  %3x  %s %s\n", i, line, buf);
}
#endif