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OpenCloudOS-Kernel/drivers/pcmcia/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
* <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;
/* give socket some time to power down */
msleep(100);
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,
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);
}
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);
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