/*      $NetBSD: ld_sdmmc.c,v 1.45 2025/04/13 02:34:03 rin Exp $        */

/*
 * Copyright (c) 2008 KIYOHARA Takashi
 * 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 ``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.
 *
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ld_sdmmc.c,v 1.45 2025/04/13 02:34:03 rin Exp $");

#ifdef _KERNEL_OPT
#include "opt_sdmmc.h"
#endif

#include <sys/param.h>
#include <sys/types.h>

#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/dkio.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/kthread.h>
#include <sys/module.h>
#include <sys/syslog.h>
#include <sys/systm.h>

#include <dev/ldvar.h>

#include <dev/sdmmc/sdmmcvar.h>

#include "ioconf.h"

#ifdef LD_SDMMC_DEBUG
#define DPRINTF(s)      printf s
#else
#define DPRINTF(s)      __nothing
#endif

#define LD_SDMMC_IORETRIES      5       /* number of retries before giving up */
#define RECOVERYTIME            hz/2    /* time to wait before retrying a cmd */

#define LD_SDMMC_MAXQUEUECNT    4       /* number of queued bio requests */
#define LD_SDMMC_MAXTASKCNT     8       /* number of tasks in task pool */

struct ld_sdmmc_softc;

struct ld_sdmmc_task {
        struct sdmmc_task task;
        struct ld_sdmmc_softc *task_sc;

        struct buf *task_bp;
        int task_retries; /* number of xfer retry */
        struct callout task_restart_ch;

        bool task_poll;
        int *task_errorp;

        TAILQ_ENTRY(ld_sdmmc_task) task_entry;
};

struct ld_sdmmc_softc {
        struct ld_softc sc_ld;
        int sc_hwunit;
        char *sc_typename;
        struct sdmmc_function *sc_sf;

        kmutex_t sc_lock;
        kcondvar_t sc_cv;
        TAILQ_HEAD(, ld_sdmmc_task) sc_freeq;
        TAILQ_HEAD(, ld_sdmmc_task) sc_xferq;
        unsigned sc_busy;
        bool sc_dying;

        struct evcnt sc_ev_discard;     /* discard counter */
        struct evcnt sc_ev_discarderr;  /* discard error counter */
        struct evcnt sc_ev_discardbusy; /* discard busy counter */
        struct evcnt sc_ev_cachesyncbusy; /* cache sync busy counter */

        struct ld_sdmmc_task sc_task[LD_SDMMC_MAXTASKCNT];
};

static int ld_sdmmc_match(device_t, cfdata_t, void *);
static void ld_sdmmc_attach(device_t, device_t, void *);
static int ld_sdmmc_detach(device_t, int);

static int ld_sdmmc_dump(struct ld_softc *, void *, daddr_t, int);
static int ld_sdmmc_start(struct ld_softc *, struct buf *);
static void ld_sdmmc_restart(void *);
static int ld_sdmmc_discard(struct ld_softc *, struct buf *);
static int ld_sdmmc_ioctl(struct ld_softc *, u_long, void *, int32_t, bool);

static void ld_sdmmc_doattach(void *);
static void ld_sdmmc_dobio(void *);
static void ld_sdmmc_dodiscard(void *);

CFATTACH_DECL_NEW(ld_sdmmc, sizeof(struct ld_sdmmc_softc),
    ld_sdmmc_match, ld_sdmmc_attach, ld_sdmmc_detach, NULL);

static struct ld_sdmmc_task *
ld_sdmmc_task_get(struct ld_sdmmc_softc *sc)
{
        struct ld_sdmmc_task *task;

        KASSERT(mutex_owned(&sc->sc_lock));

        if (sc->sc_dying || (task = TAILQ_FIRST(&sc->sc_freeq)) == NULL)
                return NULL;
        TAILQ_REMOVE(&sc->sc_freeq, task, task_entry);
        TAILQ_INSERT_TAIL(&sc->sc_xferq, task, task_entry);
        KASSERT(task->task_bp == NULL);
        KASSERT(task->task_errorp == NULL);

        return task;
}

static void
ld_sdmmc_task_put(struct ld_sdmmc_softc *sc, struct ld_sdmmc_task *task)
{

        KASSERT(mutex_owned(&sc->sc_lock));

        TAILQ_REMOVE(&sc->sc_xferq, task, task_entry);
        TAILQ_INSERT_TAIL(&sc->sc_freeq, task, task_entry);
        task->task_bp = NULL;
        task->task_errorp = NULL;
}

static void
ld_sdmmc_task_cancel(struct ld_sdmmc_softc *sc, struct ld_sdmmc_task *task)
{
        struct buf *bp;
        int *errorp;

        KASSERT(mutex_owned(&sc->sc_lock));
        KASSERT(sc->sc_dying);

        /*
         * Either the callout or the task may be pending, but not both.
         * First, determine whether the callout is pending.
         */
        if (callout_pending(&task->task_restart_ch) ||
            callout_invoking(&task->task_restart_ch)) {
                /*
                 * The callout either is pending, or just started but
                 * is waiting for us to release the lock.  At this
                 * point, it will notice sc->sc_dying and give up, so
                 * just wait for it to complete and then we will
                 * release everything.
                 */
                callout_halt(&task->task_restart_ch, &sc->sc_lock);
        } else {
                /*
                 * If the callout is running, it has just scheduled, so
                 * after we wait for the callout to finish running, the
                 * task is either pending or running.  If the task is
                 * already running, it will notice sc->sc_dying and
                 * give up; otherwise we have to release everything.
                 */
                callout_halt(&task->task_restart_ch, &sc->sc_lock);
                if (!sdmmc_del_task(sc->sc_sf->sc, &task->task, &sc->sc_lock))
                        return; /* task already started, let it clean up */
        }

        /*
         * It is our responsibility to clean up.  Move it from xferq
         * back to freeq and make sure to notify anyone waiting that
         * it's finished.
         */
        bp = task->task_bp;
        errorp = task->task_errorp;
        ld_sdmmc_task_put(sc, task);

        /*
         * If the task was for an asynchronous I/O xfer, fail the I/O
         * xfer, with the softc lock dropped since this is a callback
         * into arbitrary other subsystems.
         */
        if (bp) {
                mutex_exit(&sc->sc_lock);
                /*
                 * XXX We assume that the same sequence works for bio
                 * and discard -- that lddiscardend is just the same as
                 * setting bp->b_resid = bp->b_bcount in the event of
                 * error and then calling lddone.
                 */
                bp->b_error = ENXIO;
                bp->b_resid = bp->b_bcount;
                lddone(&sc->sc_ld, bp);
                mutex_enter(&sc->sc_lock);
        }

        /*
         * If the task was for a synchronous operation (cachesync),
         * then just set the error indicator and wake up the waiter.
         */
        if (errorp) {
                *errorp = ENXIO;
                cv_broadcast(&sc->sc_cv);
        }
}

/* ARGSUSED */
static int
ld_sdmmc_match(device_t parent, cfdata_t match, void *aux)
{
        struct sdmmc_softc *sdmsc = device_private(parent);

        if (ISSET(sdmsc->sc_flags, SMF_MEM_MODE))
                return 1;
        return 0;
}

/* ARGSUSED */
static void
ld_sdmmc_attach(device_t parent, device_t self, void *aux)
{
        struct ld_sdmmc_softc *sc = device_private(self);
        struct sdmmc_attach_args *sa = aux;
        struct ld_softc *ld = &sc->sc_ld;
        struct ld_sdmmc_task *task;
        struct lwp *lwp;
        const char *cardtype;
        int i;

        ld->sc_dv = self;

        aprint_normal(": <0x%02x:0x%04x:%s:0x%02x:0x%08x:0x%03x>\n",
            sa->sf->cid.mid, sa->sf->cid.oid, sa->sf->cid.pnm,
            sa->sf->cid.rev, sa->sf->cid.psn, sa->sf->cid.mdt);
        aprint_naive("\n");

        if (ISSET(sa->sf->sc->sc_flags, SMF_SD_MODE)) {
                cardtype = "SD card";
        } else {
                cardtype = "MMC";
        }
        sc->sc_typename = kmem_asprintf("%s 0x%02x:0x%04x:%s",
            cardtype, sa->sf->cid.mid, sa->sf->cid.oid, sa->sf->cid.pnm);

        evcnt_attach_dynamic(&sc->sc_ev_discard, EVCNT_TYPE_MISC,
            NULL, device_xname(self), "sdmmc discard count");
        evcnt_attach_dynamic(&sc->sc_ev_discarderr, EVCNT_TYPE_MISC,
            NULL, device_xname(self), "sdmmc discard errors");
        evcnt_attach_dynamic(&sc->sc_ev_discardbusy, EVCNT_TYPE_MISC,
            NULL, device_xname(self), "sdmmc discard busy");

        mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SDMMC);
        cv_init(&sc->sc_cv, "ldsdmmc");
        TAILQ_INIT(&sc->sc_freeq);
        TAILQ_INIT(&sc->sc_xferq);
        sc->sc_dying = false;

        const int ntask = __arraycount(sc->sc_task);
        for (i = 0; i < ntask; i++) {
                task = &sc->sc_task[i];
                task->task_sc = sc;
                callout_init(&task->task_restart_ch, CALLOUT_MPSAFE);
                TAILQ_INSERT_TAIL(&sc->sc_freeq, task, task_entry);
        }

        sc->sc_hwunit = 0;      /* always 0? */
        sc->sc_sf = sa->sf;

        ld->sc_flags = LDF_ENABLED | LDF_MPSAFE;
        ld->sc_secperunit = sc->sc_sf->csd.capacity;
        ld->sc_secsize = SDMMC_SECTOR_SIZE;
        ld->sc_maxxfer = MAXPHYS;
        ld->sc_maxqueuecnt = LD_SDMMC_MAXQUEUECNT;
        ld->sc_dump = ld_sdmmc_dump;
        ld->sc_start = ld_sdmmc_start;
        ld->sc_discard = ld_sdmmc_discard;
        ld->sc_ioctl = ld_sdmmc_ioctl;
        ld->sc_typename = sc->sc_typename;

        /*
         * Defer attachment of ld + disk subsystem to a thread.
         *
         * This is necessary because wedge autodiscover needs to
         * open and call into the ld driver, which could deadlock
         * when the sdmmc driver isn't ready in early bootstrap.
         *
         * Don't mark thread as MPSAFE to keep aprint output sane.
         */
        config_pending_incr(self);
        if (kthread_create(PRI_NONE, 0, NULL,
            ld_sdmmc_doattach, sc, &lwp, "%sattach", device_xname(self))) {
                aprint_error_dev(self, "couldn't create thread\n");
        }
}

static void
ld_sdmmc_doattach(void *arg)
{
        struct ld_sdmmc_softc *sc = (struct ld_sdmmc_softc *)arg;
        struct ld_softc *ld = &sc->sc_ld;
        struct sdmmc_softc *ssc = device_private(device_parent(ld->sc_dv));
        const u_int emmc_cache_size = sc->sc_sf->ext_csd.cache_size;
        const bool sd_cache = sc->sc_sf->ssr.cache;
        char buf[sizeof("9999 KB")];

        ldattach(ld, BUFQ_DISK_DEFAULT_STRAT);
        aprint_normal_dev(ld->sc_dv, "%d-bit width,", sc->sc_sf->width);
        if (ssc->sc_transfer_mode != NULL)
                aprint_normal(" %s,", ssc->sc_transfer_mode);
        if (emmc_cache_size > 0) {
                format_bytes(buf, sizeof(buf), emmc_cache_size);
                aprint_normal(" %s cache%s,", buf,
                    ISSET(sc->sc_sf->flags, SFF_CACHE_ENABLED) ? "" :
                    " (disabled)");
        } else if (sd_cache) {
                aprint_normal(" Cache%s,",
                    ISSET(sc->sc_sf->flags, SFF_CACHE_ENABLED) ? "" :
                    " (disabled)");
        }
        if ((ssc->sc_busclk / 1000) != 0)
                aprint_normal(" %u.%03u MHz\n",
                    ssc->sc_busclk / 1000, ssc->sc_busclk % 1000);
        else
                aprint_normal(" %u KHz\n", ssc->sc_busclk % 1000);
        config_pending_decr(ld->sc_dv);
        kthread_exit(0);
}

static int
ld_sdmmc_detach(device_t dev, int flags)
{
        struct ld_sdmmc_softc *sc = device_private(dev);
        struct ld_softc *ld = &sc->sc_ld;
        struct ld_sdmmc_task *task;
        int error, i;

        /*
         * Block new xfers, or fail if the disk is still open and the
         * detach isn't forced.  After this point, we are committed to
         * detaching.
         */
        error = ldbegindetach(ld, flags);
        if (error)
                return error;

        /*
         * Abort all pending tasks, and wait for all pending waiters to
         * notice that we're gone.
         */
        mutex_enter(&sc->sc_lock);
        sc->sc_dying = true;
        while ((task = TAILQ_FIRST(&sc->sc_xferq)) != NULL)
                ld_sdmmc_task_cancel(sc, task);
        while (sc->sc_busy)
                cv_wait(&sc->sc_cv, &sc->sc_lock);
        mutex_exit(&sc->sc_lock);

        /* Done!  Destroy the disk.  */
        ldenddetach(ld);

        KASSERT(TAILQ_EMPTY(&sc->sc_xferq));

        for (i = 0; i < __arraycount(sc->sc_task); i++)
                callout_destroy(&sc->sc_task[i].task_restart_ch);

        cv_destroy(&sc->sc_cv);
        mutex_destroy(&sc->sc_lock);

        evcnt_detach(&sc->sc_ev_discard);
        evcnt_detach(&sc->sc_ev_discarderr);
        evcnt_detach(&sc->sc_ev_discardbusy);
        kmem_free(sc->sc_typename, strlen(sc->sc_typename) + 1);

        return 0;
}

static int
ld_sdmmc_start(struct ld_softc *ld, struct buf *bp)
{
        struct ld_sdmmc_softc *sc = device_private(ld->sc_dv);
        struct ld_sdmmc_task *task;
        int error;

        mutex_enter(&sc->sc_lock);
        if ((task = ld_sdmmc_task_get(sc)) == NULL) {
                error = EAGAIN;
                goto out;
        }

        task->task_bp = bp;
        task->task_retries = 0;
        sdmmc_init_task(&task->task, ld_sdmmc_dobio, task);

        sdmmc_add_task(sc->sc_sf->sc, &task->task);

        /* Success!  The xfer is now queued.  */
        error = 0;

out:    mutex_exit(&sc->sc_lock);
        return error;
}

static void
ld_sdmmc_restart(void *arg)
{
        struct ld_sdmmc_task *task = (struct ld_sdmmc_task *)arg;
        struct ld_sdmmc_softc *sc = task->task_sc;
        struct buf *bp = task->task_bp;

        bp->b_resid = bp->b_bcount;

        mutex_enter(&sc->sc_lock);
        callout_ack(&task->task_restart_ch);
        if (!sc->sc_dying)
                sdmmc_add_task(sc->sc_sf->sc, &task->task);
        mutex_exit(&sc->sc_lock);
}

static void
ld_sdmmc_dobio(void *arg)
{
        struct ld_sdmmc_task *task = (struct ld_sdmmc_task *)arg;
        struct ld_sdmmc_softc *sc = task->task_sc;
        struct buf *bp = task->task_bp;
        int error;

        /*
         * I/O operation
         */
        DPRINTF(("%s: I/O operation (dir=%s, blkno=0x%jx, bcnt=0x%x)\n",
            device_xname(sc->sc_ld.sc_dv), bp->b_flags & B_READ ? "IN" : "OUT",
            bp->b_rawblkno, bp->b_bcount));

        /* is everything done in terms of blocks? */
        if (bp->b_rawblkno >= sc->sc_sf->csd.capacity) {
                /* trying to read or write past end of device */
                aprint_error_dev(sc->sc_ld.sc_dv,
                    "blkno 0x%" PRIu64 " exceeds capacity %d\n",
                    bp->b_rawblkno, sc->sc_sf->csd.capacity);
                bp->b_error = EINVAL;
                bp->b_resid = bp->b_bcount;

                goto done;
        }

        if (bp->b_flags & B_READ)
                error = sdmmc_mem_read_block(sc->sc_sf, bp->b_rawblkno,
                    bp->b_data, bp->b_bcount);
        else
                error = sdmmc_mem_write_block(sc->sc_sf, bp->b_rawblkno,
                    bp->b_data, bp->b_bcount);
        if (error) {
                if (task->task_retries < LD_SDMMC_IORETRIES) {
                        struct dk_softc *dksc = &sc->sc_ld.sc_dksc;
                        struct cfdriver *cd = device_cfdriver(dksc->sc_dev);

                        diskerr(bp, cd->cd_name, "error", LOG_PRINTF, 0,
                                dksc->sc_dkdev.dk_label);
                        printf(", retrying\n");
                        task->task_retries++;
                        mutex_enter(&sc->sc_lock);
                        if (sc->sc_dying) {
                                bp->b_resid = bp->b_bcount;
                                bp->b_error = error;
                                goto done_locked;
                        } else {
                                callout_reset(&task->task_restart_ch,
                                    RECOVERYTIME, ld_sdmmc_restart, task);
                        }
                        mutex_exit(&sc->sc_lock);
                        return;
                }
                bp->b_error = error;
                bp->b_resid = bp->b_bcount;
        } else {
                bp->b_resid = 0;
        }

done:
        /* Dissociate the task from the I/O xfer and release it.  */
        mutex_enter(&sc->sc_lock);
done_locked:
        ld_sdmmc_task_put(sc, task);
        mutex_exit(&sc->sc_lock);

        lddone(&sc->sc_ld, bp);
}

static int
ld_sdmmc_dump(struct ld_softc *ld, void *data, daddr_t blkno, int blkcnt)
{
        struct ld_sdmmc_softc *sc = device_private(ld->sc_dv);

        if (blkno + blkcnt - 1 >= sc->sc_sf->csd.capacity)
                return EIO;

        return sdmmc_mem_write_block(sc->sc_sf, blkno, data,
            blkcnt * ld->sc_secsize);
}

static void
ld_sdmmc_dodiscard(void *arg)
{
        struct ld_sdmmc_task *task = arg;
        struct ld_sdmmc_softc *sc = task->task_sc;
        struct buf *bp = task->task_bp;
        uint32_t sblkno, nblks;
        int error;

        /* first and last block to erase */
        sblkno = bp->b_rawblkno;
        nblks  = howmany(bp->b_bcount, sc->sc_ld.sc_secsize);

        /* An error from discard is non-fatal */
        error = sdmmc_mem_discard(sc->sc_sf, sblkno, sblkno + nblks - 1);

        /* Count error or success and release the task.  */
        mutex_enter(&sc->sc_lock);
        if (error)
                sc->sc_ev_discarderr.ev_count++;
        else
                sc->sc_ev_discard.ev_count++;
        ld_sdmmc_task_put(sc, task);
        mutex_exit(&sc->sc_lock);

        /* Record the error and notify the xfer of completion.  */
        if (error)
                bp->b_error = error;
        lddiscardend(&sc->sc_ld, bp);
}

static int
ld_sdmmc_discard(struct ld_softc *ld, struct buf *bp)
{
        struct ld_sdmmc_softc *sc = device_private(ld->sc_dv);
        struct ld_sdmmc_task *task;
        int error;

        mutex_enter(&sc->sc_lock);

        /* Acquire a free task, or drop the request altogether.  */
        if ((task = ld_sdmmc_task_get(sc)) == NULL) {
                sc->sc_ev_discardbusy.ev_count++;
                error = EBUSY;
                goto out;
        }

        /* Set up the task and schedule it.  */
        task->task_bp = bp;
        sdmmc_init_task(&task->task, ld_sdmmc_dodiscard, task);

        sdmmc_add_task(sc->sc_sf->sc, &task->task);

        /* Success!  The request is queued.  */
        error = 0;

out:    mutex_exit(&sc->sc_lock);
        return error;
}

static void
ld_sdmmc_docachesync(void *arg)
{
        struct ld_sdmmc_task *task = arg;
        struct ld_sdmmc_softc *sc = task->task_sc;
        int error;

        /* Flush the cache.  */
        error = sdmmc_mem_flush_cache(sc->sc_sf, task->task_poll);

        mutex_enter(&sc->sc_lock);

        /* Notify the other thread that we're done; pass on the error.  */
        *task->task_errorp = error;
        cv_broadcast(&sc->sc_cv);

        /* Release the task.  */
        ld_sdmmc_task_put(sc, task);

        mutex_exit(&sc->sc_lock);
}

static int
ld_sdmmc_cachesync(struct ld_softc *ld, bool poll)
{
        struct ld_sdmmc_softc *sc = device_private(ld->sc_dv);
        struct sdmmc_softc *sdmmc = device_private(device_parent(ld->sc_dv));
        struct ld_sdmmc_task *task;
        int error = -1;

        /*
         * If we come here through the sdmmc discovery task, we can't
         * wait for a new task because the new task can't even begin
         * until the sdmmc discovery task has completed.
         *
         * XXX This is wrong, because there may already be queued I/O
         * tasks ahead of us.  Fixing this properly requires doing
         * discovery in a separate thread.  But this should avoid the
         * deadlock of PR kern/57870 (https://gnats.NetBSD.org/57870)
         * until we do split that up.
         */
        if (curlwp == sdmmc->sc_tskq_lwp)
                return sdmmc_mem_flush_cache(sc->sc_sf, poll);

        mutex_enter(&sc->sc_lock);

        /* Acquire a free task, or fail with EBUSY.  */
        if ((task = ld_sdmmc_task_get(sc)) == NULL) {
                sc->sc_ev_cachesyncbusy.ev_count++;
                error = EBUSY;
                goto out;
        }

        /* Set up the task and schedule it.  */
        task->task_poll = poll;
        task->task_errorp = &error;
        sdmmc_init_task(&task->task, ld_sdmmc_docachesync, task);

        sdmmc_add_task(sc->sc_sf->sc, &task->task);

        /*
         * Wait for the task to complete.  If the device is yanked,
         * detach will notify us.  Keep the busy count up until we're
         * done waiting so that the softc doesn't go away until we're
         * done.
         */
        sc->sc_busy++;
        KASSERT(sc->sc_busy <= LD_SDMMC_MAXTASKCNT);
        while (error == -1)
                cv_wait(&sc->sc_cv, &sc->sc_lock);
        if (--sc->sc_busy == 0)
                cv_broadcast(&sc->sc_cv);

out:    mutex_exit(&sc->sc_lock);
        return error;
}

static int
ld_sdmmc_ioctl(struct ld_softc *ld, u_long cmd, void *addr, int32_t flag,
    bool poll)
{

        switch (cmd) {
        case DIOCCACHESYNC:
                return ld_sdmmc_cachesync(ld, poll);
        default:
                return EPASSTHROUGH;
        }
}

MODULE(MODULE_CLASS_DRIVER, ld_sdmmc, "ld");

#ifdef _MODULE
/*
 * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd"
 * XXX it will be defined in the common-code module
 */
#undef  CFDRIVER_DECL
#define CFDRIVER_DECL(name, class, attr)
#include "ioconf.c"
#endif

static int
ld_sdmmc_modcmd(modcmd_t cmd, void *opaque)
{
#ifdef _MODULE
        /*
         * We ignore the cfdriver_vec[] that ioconf provides, since
         * the cfdrivers are attached already.
         */
        static struct cfdriver * const no_cfdriver_vec[] = { NULL };
#endif
        int error = 0;

#ifdef _MODULE
        switch (cmd) {
        case MODULE_CMD_INIT:
                error = config_init_component(no_cfdriver_vec,
                    cfattach_ioconf_ld_sdmmc, cfdata_ioconf_ld_sdmmc);
                break;
        case MODULE_CMD_FINI:
                error = config_fini_component(no_cfdriver_vec,
                    cfattach_ioconf_ld_sdmmc, cfdata_ioconf_ld_sdmmc);
                break;
        default:
                error = ENOTTY;
                break;
        }
#endif

        return error;
}