kernel-ark/drivers/pcmcia/cs.c
Rafael J. Wysocki 8314418629 Freezer: make kernel threads nonfreezable by default
Currently, the freezer treats all tasks as freezable, except for the kernel
threads that explicitly set the PF_NOFREEZE flag for themselves.  This
approach is problematic, since it requires every kernel thread to either
set PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn't
care for the freezing of tasks at all.

It seems better to only require the kernel threads that want to or need to
be frozen to use some freezer-related code and to remove any
freezer-related code from the other (nonfreezable) kernel threads, which is
done in this patch.

The patch causes all kernel threads to be nonfreezable by default (ie.  to
have PF_NOFREEZE set by default) and introduces the set_freezable()
function that should be called by the freezable kernel threads in order to
unset PF_NOFREEZE.  It also makes all of the currently freezable kernel
threads call set_freezable(), so it shouldn't cause any (intentional)
change of behaviour to appear.  Additionally, it updates documentation to
describe the freezing of tasks more accurately.

[akpm@linux-foundation.org: build fixes]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00

962 lines
22 KiB
C

/*
* 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/system.h>
#include <asm/irq.h>
#define IN_CARD_SERVICES
#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
#include <pcmcia/bulkmem.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 */
#ifdef DEBUG
static int pc_debug;
module_param(pc_debug, int, 0644);
int cs_debug_level(int level)
{
return pc_debug > level;
}
#endif
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);
/**
* Low-level PCMCIA socket drivers need to register with the PCCard
* core using pcmcia_register_socket.
*
* socket drivers are expected to use the following callbacks in their
* .drv struct:
* - pcmcia_socket_dev_suspend
* - pcmcia_socket_dev_resume
* These functions check for the appropriate struct pcmcia_soket arrays,
* and pass them to the low-level functions pcmcia_{suspend,resume}_socket
*/
static int socket_resume(struct pcmcia_socket *skt);
static int socket_suspend(struct pcmcia_socket *skt);
int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
{
struct pcmcia_socket *socket;
down_read(&pcmcia_socket_list_rwsem);
list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
if (socket->dev.parent != dev)
continue;
mutex_lock(&socket->skt_mutex);
socket_suspend(socket);
mutex_unlock(&socket->skt_mutex);
}
up_read(&pcmcia_socket_list_rwsem);
return 0;
}
EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
int pcmcia_socket_dev_resume(struct device *dev)
{
struct pcmcia_socket *socket;
down_read(&pcmcia_socket_list_rwsem);
list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
if (socket->dev.parent != dev)
continue;
mutex_lock(&socket->skt_mutex);
socket_resume(socket);
mutex_unlock(&socket->skt_mutex);
}
up_read(&pcmcia_socket_list_rwsem);
return 0;
}
EXPORT_SYMBOL(pcmcia_socket_dev_resume);
struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
{
struct device *dev = get_device(&skt->dev);
if (!dev)
return NULL;
skt = dev_get_drvdata(dev);
if (!try_module_get(skt->owner)) {
put_device(&skt->dev);
return NULL;
}
return (skt);
}
EXPORT_SYMBOL(pcmcia_get_socket);
void pcmcia_put_socket(struct pcmcia_socket *skt)
{
module_put(skt->owner);
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
*/
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;
cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops);
spin_lock_init(&socket->lock);
if (socket->resource_ops->init) {
ret = socket->resource_ops->init(socket);
if (ret)
return (ret);
}
/* 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;
snprintf(socket->dev.bus_id, BUS_ID_SIZE, "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);
init_waitqueue_head(&socket->thread_wait);
mutex_init(&socket->skt_mutex);
spin_lock_init(&socket->thread_lock);
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) {
printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
return -EIO;
}
pcmcia_parse_events(socket, SS_DETECT);
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
*/
void pcmcia_unregister_socket(struct pcmcia_socket *socket)
{
if (!socket)
return;
cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
if (socket->thread) {
wake_up(&socket->thread_wait);
kthread_stop(socket->thread);
}
release_cis_mem(socket);
/* 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 */
release_resource_db(socket);
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);
/**
* The central event handler. Send_event() sends an event to the
* 16-bit subsystem, which then calls the relevant device drivers.
* Parse_events() interprets the event bits from
* a card status change report. Do_shutdown() handles the high
* priority stuff associated with a card removal.
*/
/* NOTE: send_event needs to be called with skt->sem held. */
static int send_event(struct pcmcia_socket *s, event_t event, int priority)
{
int ret;
if (s->state & SOCKET_CARDBUS)
return 0;
cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
event, priority, s->callback);
if (!s->callback)
return 0;
if (!try_module_get(s->callback->owner))
return 0;
ret = s->callback->event(s, event, priority);
module_put(s->callback->owner);
return ret;
}
static void socket_remove_drivers(struct pcmcia_socket *skt)
{
cs_dbg(skt, 4, "remove_drivers\n");
send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
}
static int socket_reset(struct pcmcia_socket *skt)
{
int status, i;
cs_dbg(skt, 4, "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 CS_NO_CARD;
if (status & SS_READY)
return CS_SUCCESS;
msleep(unreset_check * 10);
}
cs_err(skt, "time out after reset.\n");
return CS_GENERAL_FAILURE;
}
/**
* 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;
cs_dbg(s, 4, "shutdown\n");
socket_remove_drivers(s);
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->irq.AssignedIRQ = s->irq.Config = 0;
s->lock_count = 0;
destroy_cis_cache(s);
#ifdef CONFIG_CARDBUS
cb_free(s);
#endif
s->functions = 0;
s->ops->get_status(s, &status);
if (status & SS_POWERON) {
printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
}
cs_socket_put(s);
}
static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
{
int status, i;
cs_dbg(skt, 4, "setup\n");
skt->ops->get_status(skt, &status);
if (!(status & SS_DETECT))
return CS_NO_CARD;
msleep(initial_delay * 10);
for (i = 0; i < 100; i++) {
skt->ops->get_status(skt, &status);
if (!(status & SS_DETECT))
return CS_NO_CARD;
if (!(status & SS_PENDING))
break;
msleep(100);
}
if (status & SS_PENDING) {
cs_err(skt, "voltage interrogation timed out.\n");
return CS_GENERAL_FAILURE;
}
if (status & SS_CARDBUS) {
if (!(skt->features & SS_CAP_CARDBUS)) {
cs_err(skt, "cardbus cards are not supported.\n");
return CS_BAD_TYPE;
}
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 {
cs_err(skt, "unsupported voltage key.\n");
return CS_BAD_TYPE;
}
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)) {
cs_err(skt, "unable to apply power.\n");
return CS_BAD_TYPE;
}
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;
cs_dbg(skt, 4, "insert\n");
if (!cs_socket_get(skt))
return CS_NO_CARD;
ret = socket_setup(skt, setup_delay);
if (ret == CS_SUCCESS) {
skt->state |= SOCKET_PRESENT;
printk(KERN_NOTICE "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
cs_dbg(skt, 4, "insert done\n");
send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
} else {
socket_shutdown(skt);
}
return ret;
}
static int socket_suspend(struct pcmcia_socket *skt)
{
if (skt->state & SOCKET_SUSPEND)
return CS_IN_USE;
send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
skt->socket = dead_socket;
skt->ops->set_socket(skt, &skt->socket);
if (skt->ops->suspend)
skt->ops->suspend(skt);
skt->state |= SOCKET_SUSPEND;
return CS_SUCCESS;
}
/*
* 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 ret;
if (!(skt->state & SOCKET_SUSPEND))
return CS_IN_USE;
skt->socket = dead_socket;
skt->ops->init(skt);
skt->ops->set_socket(skt, &skt->socket);
if (!(skt->state & SOCKET_PRESENT)) {
skt->state &= ~SOCKET_SUSPEND;
return socket_insert(skt);
}
ret = socket_setup(skt, resume_delay);
if (ret == CS_SUCCESS) {
/*
* FIXME: need a better check here for cardbus cards.
*/
if (verify_cis_cache(skt) != 0) {
cs_dbg(skt, 4, "cis mismatch - different card\n");
socket_remove_drivers(skt);
destroy_cis_cache(skt);
/*
* Workaround: give DS time to schedule removal.
* Remove me once the 100ms delay is eliminated
* in ds.c
*/
msleep(200);
send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
} else {
cs_dbg(skt, 4, "cis matches cache\n");
send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
}
} else {
socket_shutdown(skt);
}
skt->state &= ~SOCKET_SUSPEND;
return CS_SUCCESS;
}
static void socket_remove(struct pcmcia_socket *skt)
{
printk(KERN_NOTICE "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;
DECLARE_WAITQUEUE(wait, current);
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) {
printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
skt);
skt->thread = NULL;
complete(&skt->thread_done);
return 0;
}
add_wait_queue(&skt->thread_wait, &wait);
complete(&skt->thread_done);
set_freezable();
for (;;) {
unsigned long flags;
unsigned int events;
set_current_state(TASK_INTERRUPTIBLE);
spin_lock_irqsave(&skt->thread_lock, flags);
events = skt->thread_events;
skt->thread_events = 0;
spin_unlock_irqrestore(&skt->thread_lock, flags);
if (events) {
mutex_lock(&skt->skt_mutex);
if (events & SS_DETECT)
socket_detect_change(skt);
if (events & SS_BATDEAD)
send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
if (events & SS_BATWARN)
send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
if (events & SS_READY)
send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
mutex_unlock(&skt->skt_mutex);
continue;
}
if (kthread_should_stop())
break;
schedule();
try_to_freeze();
}
/* make sure we are running before we exit */
set_current_state(TASK_RUNNING);
remove_wait_queue(&skt->thread_wait, &wait);
/* remove from the device core */
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;
cs_dbg(s, 4, "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(&s->thread_wait);
}
} /* pcmcia_parse_events */
EXPORT_SYMBOL(pcmcia_parse_events);
/* 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)
send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
} 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 pccard_reset_card(struct pcmcia_socket *skt)
{
int ret;
cs_dbg(skt, 1, "resetting socket\n");
mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = CS_NO_CARD;
break;
}
if (skt->state & SOCKET_SUSPEND) {
ret = CS_IN_USE;
break;
}
if (skt->state & SOCKET_CARDBUS) {
ret = CS_UNSUPPORTED_FUNCTION;
break;
}
ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
if (ret == 0) {
send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
if (skt->callback)
skt->callback->suspend(skt);
if (socket_reset(skt) == CS_SUCCESS) {
send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
if (skt->callback)
skt->callback->resume(skt);
}
}
ret = CS_SUCCESS;
} while (0);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* reset_card */
EXPORT_SYMBOL(pccard_reset_card);
/* These shut down or wake up a socket. They are sort of user
* initiated versions of the APM suspend and resume actions.
*/
int pcmcia_suspend_card(struct pcmcia_socket *skt)
{
int ret;
cs_dbg(skt, 1, "suspending socket\n");
mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = CS_NO_CARD;
break;
}
if (skt->state & SOCKET_CARDBUS) {
ret = CS_UNSUPPORTED_FUNCTION;
break;
}
if (skt->callback) {
ret = skt->callback->suspend(skt);
if (ret)
break;
}
ret = socket_suspend(skt);
} while (0);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* suspend_card */
EXPORT_SYMBOL(pcmcia_suspend_card);
int pcmcia_resume_card(struct pcmcia_socket *skt)
{
int ret;
cs_dbg(skt, 1, "waking up socket\n");
mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = CS_NO_CARD;
break;
}
if (skt->state & SOCKET_CARDBUS) {
ret = CS_UNSUPPORTED_FUNCTION;
break;
}
ret = socket_resume(skt);
if (!ret && skt->callback)
skt->callback->resume(skt);
} while (0);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* resume_card */
EXPORT_SYMBOL(pcmcia_resume_card);
/* These handle user requests to eject or insert a card. */
int pcmcia_eject_card(struct pcmcia_socket *skt)
{
int ret;
cs_dbg(skt, 1, "user eject request\n");
mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = -ENODEV;
break;
}
ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
if (ret != 0) {
ret = -EINVAL;
break;
}
socket_remove(skt);
ret = 0;
} while (0);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* eject_card */
EXPORT_SYMBOL(pcmcia_eject_card);
int pcmcia_insert_card(struct pcmcia_socket *skt)
{
int ret;
cs_dbg(skt, 1, "user insert request\n");
mutex_lock(&skt->skt_mutex);
do {
if (skt->state & SOCKET_PRESENT) {
ret = -EBUSY;
break;
}
if (socket_insert(skt) == CS_NO_CARD) {
ret = -ENODEV;
break;
}
ret = 0;
} while (0);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* insert_card */
EXPORT_SYMBOL(pcmcia_insert_card);
static int pcmcia_socket_uevent(struct device *dev, char **envp,
int num_envp, char *buffer, int buffer_size)
{
struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
int i = 0, length = 0;
if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
&length, "SOCKET_NO=%u", s->sock))
return -ENOMEM;
envp[i] = NULL;
return 0;
}
static struct completion pcmcia_unload;
static void pcmcia_release_socket_class(struct class *data)
{
complete(&pcmcia_unload);
}
struct class pcmcia_socket_class = {
.name = "pcmcia_socket",
.dev_uevent = pcmcia_socket_uevent,
.dev_release = pcmcia_release_socket,
.class_release = pcmcia_release_socket_class,
};
EXPORT_SYMBOL(pcmcia_socket_class);
static int __init init_pcmcia_cs(void)
{
int ret;
init_completion(&pcmcia_unload);
ret = class_register(&pcmcia_socket_class);
if (ret)
return (ret);
return class_interface_register(&pccard_sysfs_interface);
}
static void __exit exit_pcmcia_cs(void)
{
class_interface_unregister(&pccard_sysfs_interface);
class_unregister(&pcmcia_socket_class);
wait_for_completion(&pcmcia_unload);
}
subsys_initcall(init_pcmcia_cs);
module_exit(exit_pcmcia_cs);