cs.c

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/*
 * cs.c -- Kernel Card Services - core services
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The initial developer of the original code is David A. Hinds
 * <[email protected]>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * (C) 1999     David A. Hinds
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <asm/irq.h>

#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include "cs_internal.h"


/* Module parameters */

MODULE_AUTHOR("David Hinds <[email protected]>");
MODULE_DESCRIPTION("Linux Kernel Card Services");
MODULE_LICENSE("GPL");

#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)

INT_MODULE_PARM(setup_delay,    10);        /* centiseconds */
INT_MODULE_PARM(resume_delay,   20);        /* centiseconds */
INT_MODULE_PARM(shutdown_delay, 3);     /* centiseconds */
INT_MODULE_PARM(vcc_settle, 40);        /* centiseconds */
INT_MODULE_PARM(reset_time, 10);        /* usecs */
INT_MODULE_PARM(unreset_delay,  10);        /* centiseconds */
INT_MODULE_PARM(unreset_check,  10);        /* centiseconds */
INT_MODULE_PARM(unreset_limit,  30);        /* unreset_check's */

/* Access speed for attribute memory windows */
INT_MODULE_PARM(cis_speed,  300);       /* ns */


socket_state_t dead_socket = {
    .csc_mask   = SS_DETECT,
};
EXPORT_SYMBOL(dead_socket);


/* List of all sockets, protected by a rwsem */
LIST_HEAD(pcmcia_socket_list);
EXPORT_SYMBOL(pcmcia_socket_list);

DECLARE_RWSEM(pcmcia_socket_list_rwsem);
EXPORT_SYMBOL(pcmcia_socket_list_rwsem);


struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
{
    struct device *dev = get_device(&skt->dev);
    if (!dev)
        return NULL;
    return dev_get_drvdata(dev);
}
EXPORT_SYMBOL(pcmcia_get_socket);


void pcmcia_put_socket(struct pcmcia_socket *skt)
{
    put_device(&skt->dev);
}
EXPORT_SYMBOL(pcmcia_put_socket);


static void pcmcia_release_socket(struct device *dev)
{
    struct pcmcia_socket *socket = dev_get_drvdata(dev);

    complete(&socket->socket_released);
}

static int pccardd(void *__skt);

int pcmcia_register_socket(struct pcmcia_socket *socket)
{
    struct task_struct *tsk;
    int ret;

    if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
        return -EINVAL;

    dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);

    /* try to obtain a socket number [yes, it gets ugly if we
     * register more than 2^sizeof(unsigned int) pcmcia
     * sockets... but the socket number is deprecated
     * anyways, so I don't care] */
    down_write(&pcmcia_socket_list_rwsem);
    if (list_empty(&pcmcia_socket_list))
        socket->sock = 0;
    else {
        unsigned int found, i = 1;
        struct pcmcia_socket *tmp;
        do {
            found = 1;
            list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
                if (tmp->sock == i)
                    found = 0;
            }
            i++;
        } while (!found);
        socket->sock = i - 1;
    }
    list_add_tail(&socket->socket_list, &pcmcia_socket_list);
    up_write(&pcmcia_socket_list_rwsem);

#ifndef CONFIG_CARDBUS
    /*
     * If we do not support Cardbus, ensure that
     * the Cardbus socket capability is disabled.
     */
    socket->features &= ~SS_CAP_CARDBUS;
#endif

    /* set proper values in socket->dev */
    dev_set_drvdata(&socket->dev, socket);
    socket->dev.class = &pcmcia_socket_class;
    dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);

    /* base address = 0, map = 0 */
    socket->cis_mem.flags = 0;
    socket->cis_mem.speed = cis_speed;

    INIT_LIST_HEAD(&socket->cis_cache);

    init_completion(&socket->socket_released);
    init_completion(&socket->thread_done);
    mutex_init(&socket->skt_mutex);
    mutex_init(&socket->ops_mutex);
    spin_lock_init(&socket->thread_lock);

    if (socket->resource_ops->init) {
        mutex_lock(&socket->ops_mutex);
        ret = socket->resource_ops->init(socket);
        mutex_unlock(&socket->ops_mutex);
        if (ret)
            goto err;
    }

    tsk = kthread_run(pccardd, socket, "pccardd");
    if (IS_ERR(tsk)) {
        ret = PTR_ERR(tsk);
        goto err;
    }

    wait_for_completion(&socket->thread_done);
    if (!socket->thread) {
        dev_printk(KERN_WARNING, &socket->dev,
               "PCMCIA: warning: socket thread did not start\n");
        return -EIO;
    }

    pcmcia_parse_events(socket, SS_DETECT);

    /*
     * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
     * If it fails, it doesn't matter -- we still have 32-bit CardBus
     * support to offer, so this is not a failure mode.
     */
    request_module_nowait("pcmcia");

    return 0;

 err:
    down_write(&pcmcia_socket_list_rwsem);
    list_del(&socket->socket_list);
    up_write(&pcmcia_socket_list_rwsem);
    return ret;
} /* pcmcia_register_socket */
EXPORT_SYMBOL(pcmcia_register_socket);


void pcmcia_unregister_socket(struct pcmcia_socket *socket)
{
    if (!socket)
        return;

    dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);

    if (socket->thread)
        kthread_stop(socket->thread);

    /* remove from our own list */
    down_write(&pcmcia_socket_list_rwsem);
    list_del(&socket->socket_list);
    up_write(&pcmcia_socket_list_rwsem);

    /* wait for sysfs to drop all references */
    if (socket->resource_ops->exit) {
        mutex_lock(&socket->ops_mutex);
        socket->resource_ops->exit(socket);
        mutex_unlock(&socket->ops_mutex);
    }
    wait_for_completion(&socket->socket_released);
} /* pcmcia_unregister_socket */
EXPORT_SYMBOL(pcmcia_unregister_socket);


struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
{
    struct pcmcia_socket *s;

    down_read(&pcmcia_socket_list_rwsem);
    list_for_each_entry(s, &pcmcia_socket_list, socket_list)
        if (s->sock == nr) {
            up_read(&pcmcia_socket_list_rwsem);
            return s;
        }
    up_read(&pcmcia_socket_list_rwsem);

    return NULL;

}
EXPORT_SYMBOL(pcmcia_get_socket_by_nr);

static int socket_reset(struct pcmcia_socket *skt)
{
    int status, i;

    dev_dbg(&skt->dev, "reset\n");

    skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
    skt->ops->set_socket(skt, &skt->socket);
    udelay((long)reset_time);

    skt->socket.flags &= ~SS_RESET;
    skt->ops->set_socket(skt, &skt->socket);

    msleep(unreset_delay * 10);
    for (i = 0; i < unreset_limit; i++) {
        skt->ops->get_status(skt, &status);

        if (!(status & SS_DETECT))
            return -ENODEV;

        if (status & SS_READY)
            return 0;

        msleep(unreset_check * 10);
    }

    dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
    return -ETIMEDOUT;
}

/*
 * socket_setup() and socket_shutdown() are called by the main event handler
 * when card insertion and removal events are received.
 * socket_setup() turns on socket power and resets the socket, in two stages.
 * socket_shutdown() unconfigures a socket and turns off socket power.
 */
static void socket_shutdown(struct pcmcia_socket *s)
{
    int status;

    dev_dbg(&s->dev, "shutdown\n");

    if (s->callback)
        s->callback->remove(s);

    mutex_lock(&s->ops_mutex);
    s->state &= SOCKET_INUSE | SOCKET_PRESENT;
    msleep(shutdown_delay * 10);
    s->state &= SOCKET_INUSE;

    /* Blank out the socket state */
    s->socket = dead_socket;
    s->ops->init(s);
    s->ops->set_socket(s, &s->socket);
    s->lock_count = 0;
    kfree(s->fake_cis);
    s->fake_cis = NULL;
    s->functions = 0;

    /* From here on we can be sure that only we (that is, the
     * pccardd thread) accesses this socket, and all (16-bit)
     * PCMCIA interactions are gone. Therefore, release
     * ops_mutex so that we don't get a sysfs-related lockdep
     * warning.
     */
    mutex_unlock(&s->ops_mutex);

#ifdef CONFIG_CARDBUS
    cb_free(s);
#endif

    /* give socket some time to power down */
    msleep(100);

    s->ops->get_status(s, &status);
    if (status & SS_POWERON) {
        dev_printk(KERN_ERR, &s->dev,
               "*** DANGER *** unable to remove socket power\n");
    }

    s->state &= ~SOCKET_INUSE;
}

static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
{
    int status, i;

    dev_dbg(&skt->dev, "setup\n");

    skt->ops->get_status(skt, &status);
    if (!(status & SS_DETECT))
        return -ENODEV;

    msleep(initial_delay * 10);

    for (i = 0; i < 100; i++) {
        skt->ops->get_status(skt, &status);
        if (!(status & SS_DETECT))
            return -ENODEV;

        if (!(status & SS_PENDING))
            break;

        msleep(100);
    }

    if (status & SS_PENDING) {
        dev_printk(KERN_ERR, &skt->dev,
               "voltage interrogation timed out.\n");
        return -ETIMEDOUT;
    }

    if (status & SS_CARDBUS) {
        if (!(skt->features & SS_CAP_CARDBUS)) {
            dev_printk(KERN_ERR, &skt->dev,
                "cardbus cards are not supported.\n");
            return -EINVAL;
        }
        skt->state |= SOCKET_CARDBUS;
    } else
        skt->state &= ~SOCKET_CARDBUS;

    /*
     * Decode the card voltage requirements, and apply power to the card.
     */
    if (status & SS_3VCARD)
        skt->socket.Vcc = skt->socket.Vpp = 33;
    else if (!(status & SS_XVCARD))
        skt->socket.Vcc = skt->socket.Vpp = 50;
    else {
        dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
        return -EIO;
    }

    if (skt->power_hook)
        skt->power_hook(skt, HOOK_POWER_PRE);

    skt->socket.flags = 0;
    skt->ops->set_socket(skt, &skt->socket);

    /*
     * Wait "vcc_settle" for the supply to stabilise.
     */
    msleep(vcc_settle * 10);

    skt->ops->get_status(skt, &status);
    if (!(status & SS_POWERON)) {
        dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
        return -EIO;
    }

    status = socket_reset(skt);

    if (skt->power_hook)
        skt->power_hook(skt, HOOK_POWER_POST);

    return status;
}

/*
 * Handle card insertion.  Setup the socket, reset the card,
 * and then tell the rest of PCMCIA that a card is present.
 */
static int socket_insert(struct pcmcia_socket *skt)
{
    int ret;

    dev_dbg(&skt->dev, "insert\n");

    mutex_lock(&skt->ops_mutex);
    if (skt->state & SOCKET_INUSE) {
        mutex_unlock(&skt->ops_mutex);
        return -EINVAL;
    }
    skt->state |= SOCKET_INUSE;

    ret = socket_setup(skt, setup_delay);
    if (ret == 0) {
        skt->state |= SOCKET_PRESENT;

        dev_printk(KERN_NOTICE, &skt->dev,
               "pccard: %s card inserted into slot %d\n",
               (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
               skt->sock);

#ifdef CONFIG_CARDBUS
        if (skt->state & SOCKET_CARDBUS) {
            cb_alloc(skt);
            skt->state |= SOCKET_CARDBUS_CONFIG;
        }
#endif
        dev_dbg(&skt->dev, "insert done\n");
        mutex_unlock(&skt->ops_mutex);

        if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
            skt->callback->add(skt);
    } else {
        mutex_unlock(&skt->ops_mutex);
        socket_shutdown(skt);
    }

    return ret;
}

static int socket_suspend(struct pcmcia_socket *skt)
{
    if (skt->state & SOCKET_SUSPEND)
        return -EBUSY;

    mutex_lock(&skt->ops_mutex);
    skt->suspended_state = skt->state;

    skt->socket = dead_socket;
    skt->ops->set_socket(skt, &skt->socket);
    if (skt->ops->suspend)
        skt->ops->suspend(skt);
    skt->state |= SOCKET_SUSPEND;
    mutex_unlock(&skt->ops_mutex);
    return 0;
}

static int socket_early_resume(struct pcmcia_socket *skt)
{
    mutex_lock(&skt->ops_mutex);
    skt->socket = dead_socket;
    skt->ops->init(skt);
    skt->ops->set_socket(skt, &skt->socket);
    if (skt->state & SOCKET_PRESENT)
        skt->resume_status = socket_setup(skt, resume_delay);
    mutex_unlock(&skt->ops_mutex);
    return 0;
}

static int socket_late_resume(struct pcmcia_socket *skt)
{
    int ret;

    mutex_lock(&skt->ops_mutex);
    skt->state &= ~SOCKET_SUSPEND;
    mutex_unlock(&skt->ops_mutex);

    if (!(skt->state & SOCKET_PRESENT)) {
        ret = socket_insert(skt);
        if (ret == -ENODEV)
            ret = 0;
        return ret;
    }

    if (skt->resume_status) {
        socket_shutdown(skt);
        return 0;
    }

    if (skt->suspended_state != skt->state) {
        dev_dbg(&skt->dev,
            "suspend state 0x%x != resume state 0x%x\n",
            skt->suspended_state, skt->state);

        socket_shutdown(skt);
        return socket_insert(skt);
    }

#ifdef CONFIG_CARDBUS
    if (skt->state & SOCKET_CARDBUS) {
        /* We can't be sure the CardBus card is the same
         * as the one previously inserted. Therefore, remove
         * and re-add... */
        cb_free(skt);
        cb_alloc(skt);
        return 0;
    }
#endif
    if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
        skt->callback->early_resume(skt);
    return 0;
}

/*
 * Resume a socket.  If a card is present, verify its CIS against
 * our cached copy.  If they are different, the card has been
 * replaced, and we need to tell the drivers.
 */
static int socket_resume(struct pcmcia_socket *skt)
{
    if (!(skt->state & SOCKET_SUSPEND))
        return -EBUSY;

    socket_early_resume(skt);
    return socket_late_resume(skt);
}

static void socket_remove(struct pcmcia_socket *skt)
{
    dev_printk(KERN_NOTICE, &skt->dev,
           "pccard: card ejected from slot %d\n", skt->sock);
    socket_shutdown(skt);
}

/*
 * Process a socket card detect status change.
 *
 * If we don't have a card already present, delay the detect event for
 * about 20ms (to be on the safe side) before reading the socket status.
 *
 * Some i82365-based systems send multiple SS_DETECT events during card
 * insertion, and the "card present" status bit seems to bounce.  This
 * will probably be true with GPIO-based card detection systems after
 * the product has aged.
 */
static void socket_detect_change(struct pcmcia_socket *skt)
{
    if (!(skt->state & SOCKET_SUSPEND)) {
        int status;

        if (!(skt->state & SOCKET_PRESENT))
            msleep(20);

        skt->ops->get_status(skt, &status);
        if ((skt->state & SOCKET_PRESENT) &&
             !(status & SS_DETECT))
            socket_remove(skt);
        if (!(skt->state & SOCKET_PRESENT) &&
            (status & SS_DETECT))
            socket_insert(skt);
    }
}

static int pccardd(void *__skt)
{
    struct pcmcia_socket *skt = __skt;
    int ret;

    skt->thread = current;
    skt->socket = dead_socket;
    skt->ops->init(skt);
    skt->ops->set_socket(skt, &skt->socket);

    /* register with the device core */
    ret = device_register(&skt->dev);
    if (ret) {
        dev_printk(KERN_WARNING, &skt->dev,
               "PCMCIA: unable to register socket\n");
        skt->thread = NULL;
        complete(&skt->thread_done);
        return 0;
    }
    ret = pccard_sysfs_add_socket(&skt->dev);
    if (ret)
        dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);

    complete(&skt->thread_done);

    /* wait for userspace to catch up */
    msleep(250);

    set_freezable();
    for (;;) {
        unsigned long flags;
        unsigned int events;
        unsigned int sysfs_events;

        set_current_state(TASK_INTERRUPTIBLE);

        spin_lock_irqsave(&skt->thread_lock, flags);
        events = skt->thread_events;
        skt->thread_events = 0;
        sysfs_events = skt->sysfs_events;
        skt->sysfs_events = 0;
        spin_unlock_irqrestore(&skt->thread_lock, flags);

        mutex_lock(&skt->skt_mutex);
        if (events & SS_DETECT)
            socket_detect_change(skt);

        if (sysfs_events) {
            if (sysfs_events & PCMCIA_UEVENT_EJECT)
                socket_remove(skt);
            if (sysfs_events & PCMCIA_UEVENT_INSERT)
                socket_insert(skt);
            if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
                !(skt->state & SOCKET_CARDBUS)) {
                if (skt->callback)
                    ret = skt->callback->suspend(skt);
                else
                    ret = 0;
                if (!ret) {
                    socket_suspend(skt);
                    msleep(100);
                }
            }
            if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
                !(skt->state & SOCKET_CARDBUS)) {
                ret = socket_resume(skt);
                if (!ret && skt->callback)
                    skt->callback->resume(skt);
            }
            if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
                !(skt->state & SOCKET_CARDBUS)) {
                if (!ret && skt->callback)
                    skt->callback->requery(skt);
            }
        }
        mutex_unlock(&skt->skt_mutex);

        if (events || sysfs_events)
            continue;

        if (kthread_should_stop())
            break;

        schedule();
        try_to_freeze();
    }
    /* make sure we are running before we exit */
    set_current_state(TASK_RUNNING);

    /* shut down socket, if a device is still present */
    if (skt->state & SOCKET_PRESENT) {
        mutex_lock(&skt->skt_mutex);
        socket_remove(skt);
        mutex_unlock(&skt->skt_mutex);
    }

    /* remove from the device core */
    pccard_sysfs_remove_socket(&skt->dev);
    device_unregister(&skt->dev);

    return 0;
}

/*
 * Yenta (at least) probes interrupts before registering the socket and
 * starting the handler thread.
 */
void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
{
    unsigned long flags;
    dev_dbg(&s->dev, "parse_events: events %08x\n", events);
    if (s->thread) {
        spin_lock_irqsave(&s->thread_lock, flags);
        s->thread_events |= events;
        spin_unlock_irqrestore(&s->thread_lock, flags);

        wake_up_process(s->thread);
    }
} /* pcmcia_parse_events */
EXPORT_SYMBOL(pcmcia_parse_events);

void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
{
    unsigned long flags;
    dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
    if (s->thread) {
        spin_lock_irqsave(&s->thread_lock, flags);
        s->sysfs_events |= events;
        spin_unlock_irqrestore(&s->thread_lock, flags);

        wake_up_process(s->thread);
    }
}
EXPORT_SYMBOL(pcmcia_parse_uevents);


/* register pcmcia_callback */
int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
{
    int ret = 0;

    /* s->skt_mutex also protects s->callback */
    mutex_lock(&s->skt_mutex);

    if (c) {
        /* registration */
        if (s->callback) {
            ret = -EBUSY;
            goto err;
        }

        s->callback = c;

        if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
            s->callback->add(s);
    } else
        s->callback = NULL;
 err:
    mutex_unlock(&s->skt_mutex);

    return ret;
}
EXPORT_SYMBOL(pccard_register_pcmcia);


/* I'm not sure which "reset" function this is supposed to use,
 * but for now, it uses the low-level interface's reset, not the
 * CIS register.
 */

int pcmcia_reset_card(struct pcmcia_socket *skt)
{
    int ret;

    dev_dbg(&skt->dev, "resetting socket\n");

    mutex_lock(&skt->skt_mutex);
    do {
        if (!(skt->state & SOCKET_PRESENT)) {
            dev_dbg(&skt->dev, "can't reset, not present\n");
            ret = -ENODEV;
            break;
        }
        if (skt->state & SOCKET_SUSPEND) {
            dev_dbg(&skt->dev, "can't reset, suspended\n");
            ret = -EBUSY;
            break;
        }
        if (skt->state & SOCKET_CARDBUS) {
            dev_dbg(&skt->dev, "can't reset, is cardbus\n");
            ret = -EPERM;
            break;
        }

        if (skt->callback)
            skt->callback->suspend(skt);
        mutex_lock(&skt->ops_mutex);
        ret = socket_reset(skt);
        mutex_unlock(&skt->ops_mutex);
        if ((ret == 0) && (skt->callback))
            skt->callback->resume(skt);

        ret = 0;
    } while (0);
    mutex_unlock(&skt->skt_mutex);

    return ret;
} /* reset_card */
EXPORT_SYMBOL(pcmcia_reset_card);


static int pcmcia_socket_uevent(struct device *dev,
                struct kobj_uevent_env *env)
{
    struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);

    if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
        return -ENOMEM;

    return 0;
}


static struct completion pcmcia_unload;

static void pcmcia_release_socket_class(struct class *data)
{
    complete(&pcmcia_unload);
}


#ifdef CONFIG_PM

static int __pcmcia_pm_op(struct device *dev,
              int (*callback) (struct pcmcia_socket *skt))
{
    struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
    int ret;

    mutex_lock(&s->skt_mutex);
    ret = callback(s);
    mutex_unlock(&s->skt_mutex);

    return ret;
}

static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
{
    return __pcmcia_pm_op(dev, socket_suspend);
}

static int pcmcia_socket_dev_resume_noirq(struct device *dev)
{
    return __pcmcia_pm_op(dev, socket_early_resume);
}

static int __used pcmcia_socket_dev_resume(struct device *dev)
{
    return __pcmcia_pm_op(dev, socket_late_resume);
}

static const struct dev_pm_ops pcmcia_socket_pm_ops = {
    /* dev_resume may be called with IRQs enabled */
    SET_SYSTEM_SLEEP_PM_OPS(NULL,
                pcmcia_socket_dev_resume)

    /* late suspend must be called with IRQs disabled */
    .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
    .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
    .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,

    /* early resume must be called with IRQs disabled */
    .resume_noirq = pcmcia_socket_dev_resume_noirq,
    .thaw_noirq = pcmcia_socket_dev_resume_noirq,
    .restore_noirq = pcmcia_socket_dev_resume_noirq,
};

#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)

#else /* CONFIG_PM */

#define PCMCIA_SOCKET_CLASS_PM_OPS NULL

#endif /* CONFIG_PM */

struct class pcmcia_socket_class = {
    .name = "pcmcia_socket",
    .dev_uevent = pcmcia_socket_uevent,
    .dev_release = pcmcia_release_socket,
    .class_release = pcmcia_release_socket_class,
    .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
};
EXPORT_SYMBOL(pcmcia_socket_class);


static int __init init_pcmcia_cs(void)
{
    init_completion(&pcmcia_unload);
    return class_register(&pcmcia_socket_class);
}

static void __exit exit_pcmcia_cs(void)
{
    class_unregister(&pcmcia_socket_class);
    wait_for_completion(&pcmcia_unload);
}

subsys_initcall(init_pcmcia_cs);
module_exit(exit_pcmcia_cs);