WSL2-Linux-Kernel/drivers/pcmcia/cs.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* cs.c -- Kernel Card Services - core services
*
* 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_warn(&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_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_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_err(&skt->dev, "voltage interrogation timed out\n");
return -ETIMEDOUT;
}
if (status & SS_CARDBUS) {
if (!(skt->features & SS_CAP_CARDBUS)) {
dev_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_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_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_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)
{
PCMCIA / PM: Avoid noirq suspend aborts during suspend-to-idle There is a problem with PCMCIA system resume callbacks with respect to suspend-to-idle in which the ->suspend_noirq() callback may be invoked after the ->resume_noirq() one without resuming the system entirely in some cases. This doesn't work for PCMCIA because of the lack of symmetry between its system suspend and system resume "noirq" callbacks. The system resume handling in PCMCIA is split between socket_early_resume() and socket_late_resume() which are called in different phases of system resume and both need to run for socket_suspend() (invoked by the system suspend "noirq" callback) to work. Specifically, socket_suspend() returns an error when called after socket_early_resume() without socket_late_resume(), so if the suspend-to-idle core detects a spurious wakeup event and attempts to put the system back to sleep, that is aborted by the error coming from socket_suspend(). Avoid that by using a new socket state flag, SOCKET_IN_RESUME, to indicate that socket_early_resume() has already run for the socket in which case socket_suspend() will do minimum handling and return 0. This change has been tested on my venerable Toshiba Portege R500 (which is where the problem has been discovered in the first place), but admittedly I have no PCMCIA cards to test along with the socket itself. Fixes: 33e4f80ee69b (ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [linux@dominikbrodowski.net: follow same codepaths for both suspend variants; call ->suspend()] Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-02-21 15:24:16 +03:00
if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME))
return -EBUSY;
mutex_lock(&skt->ops_mutex);
PCMCIA / PM: Avoid noirq suspend aborts during suspend-to-idle There is a problem with PCMCIA system resume callbacks with respect to suspend-to-idle in which the ->suspend_noirq() callback may be invoked after the ->resume_noirq() one without resuming the system entirely in some cases. This doesn't work for PCMCIA because of the lack of symmetry between its system suspend and system resume "noirq" callbacks. The system resume handling in PCMCIA is split between socket_early_resume() and socket_late_resume() which are called in different phases of system resume and both need to run for socket_suspend() (invoked by the system suspend "noirq" callback) to work. Specifically, socket_suspend() returns an error when called after socket_early_resume() without socket_late_resume(), so if the suspend-to-idle core detects a spurious wakeup event and attempts to put the system back to sleep, that is aborted by the error coming from socket_suspend(). Avoid that by using a new socket state flag, SOCKET_IN_RESUME, to indicate that socket_early_resume() has already run for the socket in which case socket_suspend() will do minimum handling and return 0. This change has been tested on my venerable Toshiba Portege R500 (which is where the problem has been discovered in the first place), but admittedly I have no PCMCIA cards to test along with the socket itself. Fixes: 33e4f80ee69b (ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [linux@dominikbrodowski.net: follow same codepaths for both suspend variants; call ->suspend()] Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-02-21 15:24:16 +03:00
/* store state on first suspend, but not after spurious wakeups */
if (!(skt->state & SOCKET_IN_RESUME))
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;
PCMCIA / PM: Avoid noirq suspend aborts during suspend-to-idle There is a problem with PCMCIA system resume callbacks with respect to suspend-to-idle in which the ->suspend_noirq() callback may be invoked after the ->resume_noirq() one without resuming the system entirely in some cases. This doesn't work for PCMCIA because of the lack of symmetry between its system suspend and system resume "noirq" callbacks. The system resume handling in PCMCIA is split between socket_early_resume() and socket_late_resume() which are called in different phases of system resume and both need to run for socket_suspend() (invoked by the system suspend "noirq" callback) to work. Specifically, socket_suspend() returns an error when called after socket_early_resume() without socket_late_resume(), so if the suspend-to-idle core detects a spurious wakeup event and attempts to put the system back to sleep, that is aborted by the error coming from socket_suspend(). Avoid that by using a new socket state flag, SOCKET_IN_RESUME, to indicate that socket_early_resume() has already run for the socket in which case socket_suspend() will do minimum handling and return 0. This change has been tested on my venerable Toshiba Portege R500 (which is where the problem has been discovered in the first place), but admittedly I have no PCMCIA cards to test along with the socket itself. Fixes: 33e4f80ee69b (ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [linux@dominikbrodowski.net: follow same codepaths for both suspend variants; call ->suspend()] Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-02-21 15:24:16 +03:00
skt->state &= ~SOCKET_IN_RESUME;
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);
PCMCIA / PM: Avoid noirq suspend aborts during suspend-to-idle There is a problem with PCMCIA system resume callbacks with respect to suspend-to-idle in which the ->suspend_noirq() callback may be invoked after the ->resume_noirq() one without resuming the system entirely in some cases. This doesn't work for PCMCIA because of the lack of symmetry between its system suspend and system resume "noirq" callbacks. The system resume handling in PCMCIA is split between socket_early_resume() and socket_late_resume() which are called in different phases of system resume and both need to run for socket_suspend() (invoked by the system suspend "noirq" callback) to work. Specifically, socket_suspend() returns an error when called after socket_early_resume() without socket_late_resume(), so if the suspend-to-idle core detects a spurious wakeup event and attempts to put the system back to sleep, that is aborted by the error coming from socket_suspend(). Avoid that by using a new socket state flag, SOCKET_IN_RESUME, to indicate that socket_early_resume() has already run for the socket in which case socket_suspend() will do minimum handling and return 0. This change has been tested on my venerable Toshiba Portege R500 (which is where the problem has been discovered in the first place), but admittedly I have no PCMCIA cards to test along with the socket itself. Fixes: 33e4f80ee69b (ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [linux@dominikbrodowski.net: follow same codepaths for both suspend variants; call ->suspend()] Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-02-21 15:24:16 +03:00
skt->state |= SOCKET_IN_RESUME;
mutex_unlock(&skt->ops_mutex);
return 0;
}
static int socket_late_resume(struct pcmcia_socket *skt)
{
int ret = 0;
mutex_lock(&skt->ops_mutex);
PCMCIA / PM: Avoid noirq suspend aborts during suspend-to-idle There is a problem with PCMCIA system resume callbacks with respect to suspend-to-idle in which the ->suspend_noirq() callback may be invoked after the ->resume_noirq() one without resuming the system entirely in some cases. This doesn't work for PCMCIA because of the lack of symmetry between its system suspend and system resume "noirq" callbacks. The system resume handling in PCMCIA is split between socket_early_resume() and socket_late_resume() which are called in different phases of system resume and both need to run for socket_suspend() (invoked by the system suspend "noirq" callback) to work. Specifically, socket_suspend() returns an error when called after socket_early_resume() without socket_late_resume(), so if the suspend-to-idle core detects a spurious wakeup event and attempts to put the system back to sleep, that is aborted by the error coming from socket_suspend(). Avoid that by using a new socket state flag, SOCKET_IN_RESUME, to indicate that socket_early_resume() has already run for the socket in which case socket_suspend() will do minimum handling and return 0. This change has been tested on my venerable Toshiba Portege R500 (which is where the problem has been discovered in the first place), but admittedly I have no PCMCIA cards to test along with the socket itself. Fixes: 33e4f80ee69b (ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [linux@dominikbrodowski.net: follow same codepaths for both suspend variants; call ->suspend()] Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-02-21 15:24:16 +03:00
skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME);
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_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_warn(&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;
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;
set_current_state(TASK_INTERRUPTIBLE);
schedule();
/* make sure we are running */
__set_current_state(TASK_RUNNING);
try_to_freeze();
}
/* 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);