Initial import

1 files changed, 922 insertions, 0 deletions

diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
new file mode 100644
index 000000000..5292db69c
--- /dev/null
+++ b/drivers/pcmcia/cs.c
@@ -0,0 +1,922 @@
+/*
+ * 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
+ * <dahinds@users.sourceforge.net>.  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 <dahinds@users.sourceforge.net>");
+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);
+
+/**
+ * pcmcia_register_socket - add a new pcmcia socket device
+ * @socket: the &socket to register
+ */
+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);
+
+
+/**
+ * pcmcia_unregister_socket - remove a pcmcia socket device
+ * @socket: the &socket to unregister
+ */
+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 = 0;
+
+	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);
+	}
+
+	if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
+		ret = skt->callback->early_resume(skt);
+	return ret;
+}
+
+/*
+ * Finalize the resume. In case of a cardbus socket, we have
+ * to rebind the devices as we can't be certain that it has been
+ * replaced, or not.
+ */
+static int socket_complete_resume(struct pcmcia_socket *skt)
+{
+	int ret = 0;
+#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);
+		ret = cb_alloc(skt);
+		if (ret)
+			cb_free(skt);
+	}
+#endif
+	return ret;
+}
+
+/*
+ * 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)
+{
+	int err;
+	if (!(skt->state & SOCKET_SUSPEND))
+		return -EBUSY;
+
+	socket_early_resume(skt);
+	err = socket_late_resume(skt);
+	if (!err)
+		err = socket_complete_resume(skt);
+	return err;
+}
+
+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);
+
+/**
+ * pcmcia_parse_uevents() - tell pccardd to issue manual commands
+ * @s:		the PCMCIA socket we wan't to command
+ * @events:	events to pass to pccardd
+ *
+ * userspace-issued insert, eject, suspend and resume commands must be
+ * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
+ * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
+ * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
+ * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
+ */
+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 void __used pcmcia_socket_dev_complete(struct device *dev)
+{
+	WARN(__pcmcia_pm_op(dev, socket_complete_resume),
+		"failed to complete 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,
+	.complete = pcmcia_socket_dev_complete,
+};
+
+#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);
+