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path: root/drivers/pcmcia/cs.c
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Diffstat (limited to 'drivers/pcmcia/cs.c')
-rw-r--r--drivers/pcmcia/cs.c312
1 files changed, 142 insertions, 170 deletions
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 6d6f82b38a68..e679e708db63 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -140,19 +140,13 @@ 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;
+ return dev_get_drvdata(dev);
}
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);
@@ -181,8 +175,6 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
- spin_lock_init(&socket->lock);
-
/* 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
@@ -228,10 +220,13 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
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;
}
@@ -283,15 +278,17 @@ void pcmcia_unregister_socket(struct pcmcia_socket *socket)
if (socket->thread)
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);
+ 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);
@@ -328,7 +325,7 @@ static int send_event(struct pcmcia_socket *s, event_t event, int priority)
{
int ret;
- if (s->state & SOCKET_CARDBUS)
+ if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
return 0;
dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
@@ -346,13 +343,6 @@ static int send_event(struct pcmcia_socket *s, event_t event, int priority)
return ret;
}
-static void socket_remove_drivers(struct pcmcia_socket *skt)
-{
- dev_dbg(&skt->dev, "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;
@@ -395,7 +385,9 @@ static void socket_shutdown(struct pcmcia_socket *s)
dev_dbg(&s->dev, "shutdown\n");
- socket_remove_drivers(s);
+ send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
+
+ mutex_lock(&s->ops_mutex);
s->state &= SOCKET_INUSE | SOCKET_PRESENT;
msleep(shutdown_delay * 10);
s->state &= SOCKET_INUSE;
@@ -406,11 +398,21 @@ static void socket_shutdown(struct pcmcia_socket *s)
s->ops->set_socket(s, &s->socket);
s->irq.AssignedIRQ = s->irq.Config = 0;
s->lock_count = 0;
- destroy_cis_cache(s);
+ 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
- s->functions = 0;
/* give socket some time to power down */
msleep(100);
@@ -421,7 +423,7 @@ static void socket_shutdown(struct pcmcia_socket *s)
"*** DANGER *** unable to remove socket power\n");
}
- cs_socket_put(s);
+ s->state &= ~SOCKET_INUSE;
}
static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
@@ -460,7 +462,8 @@ static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
return -EINVAL;
}
skt->state |= SOCKET_CARDBUS;
- }
+ } else
+ skt->state &= ~SOCKET_CARDBUS;
/*
* Decode the card voltage requirements, and apply power to the card.
@@ -509,8 +512,12 @@ static int socket_insert(struct pcmcia_socket *skt)
dev_dbg(&skt->dev, "insert\n");
- if (!cs_socket_get(skt))
- return -ENODEV;
+ 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) {
@@ -528,9 +535,11 @@ static int socket_insert(struct pcmcia_socket *skt)
}
#endif
dev_dbg(&skt->dev, "insert done\n");
+ mutex_unlock(&skt->ops_mutex);
send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
} else {
+ mutex_unlock(&skt->ops_mutex);
socket_shutdown(skt);
}
@@ -542,58 +551,66 @@ 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;
+
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;
-
+ 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)
{
- if (!(skt->state & SOCKET_PRESENT)) {
- skt->state &= ~SOCKET_SUSPEND;
+ mutex_lock(&skt->ops_mutex);
+ skt->state &= ~SOCKET_SUSPEND;
+ mutex_unlock(&skt->ops_mutex);
+
+ if (!(skt->state & SOCKET_PRESENT))
return socket_insert(skt);
+
+ if (skt->resume_status) {
+ socket_shutdown(skt);
+ return 0;
}
- if (skt->resume_status == 0) {
- /*
- * FIXME: need a better check here for cardbus cards.
- */
- if (verify_cis_cache(skt) != 0) {
- dev_dbg(&skt->dev, "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 {
- dev_dbg(&skt->dev, "cis matches cache\n");
- send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
- }
- } else {
+ 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);
}
- skt->state &= ~SOCKET_SUSPEND;
+#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);
+ cb_alloc(skt);
+ return 0;
+ }
+#endif
+ send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
return 0;
}
@@ -672,20 +689,26 @@ static int pccardd(void *__skt)
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) {
- mutex_lock(&skt->skt_mutex);
if (events & SS_DETECT)
socket_detect_change(skt);
if (events & SS_BATDEAD)
@@ -694,10 +717,39 @@ static int pccardd(void *__skt)
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 (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_RESUME) &&
+ !(skt->state & SOCKET_CARDBUS)) {
+ ret = socket_resume(skt);
+ if (!ret && skt->callback)
+ skt->callback->resume(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);
+ }
+ 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;
@@ -707,6 +759,13 @@ static int pccardd(void *__skt)
/* 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);
@@ -732,6 +791,31 @@ void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
} /* 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)
@@ -796,7 +880,10 @@ int pcmcia_reset_card(struct pcmcia_socket *skt)
send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
if (skt->callback)
skt->callback->suspend(skt);
- if (socket_reset(skt) == 0) {
+ mutex_lock(&skt->ops_mutex);
+ ret = socket_reset(skt);
+ mutex_unlock(&skt->ops_mutex);
+ if (ret == 0) {
send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
if (skt->callback)
skt->callback->resume(skt);
@@ -812,121 +899,6 @@ int pcmcia_reset_card(struct pcmcia_socket *skt)
EXPORT_SYMBOL(pcmcia_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;
-
- dev_dbg(&skt->dev, "suspending socket\n");
-
- mutex_lock(&skt->skt_mutex);
- do {
- if (!(skt->state & SOCKET_PRESENT)) {
- ret = -ENODEV;
- break;
- }
- if (skt->state & SOCKET_CARDBUS) {
- ret = -EPERM;
- 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;
-
- dev_dbg(&skt->dev, "waking up socket\n");
-
- mutex_lock(&skt->skt_mutex);
- do {
- if (!(skt->state & SOCKET_PRESENT)) {
- ret = -ENODEV;
- break;
- }
- if (skt->state & SOCKET_CARDBUS) {
- ret = -EPERM;
- 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;
-
- dev_dbg(&skt->dev, "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;
-
- dev_dbg(&skt->dev, "user insert request\n");
-
- mutex_lock(&skt->skt_mutex);
- do {
- if (skt->state & SOCKET_PRESENT) {
- ret = -EBUSY;
- break;
- }
- if (socket_insert(skt) == -ENODEV) {
- 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)
{