--- /dev/null
+/*
+ * 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);
+
Code Review / kvmfornfv.git / blobdiff