X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fpcmcia%2Fcs.c;h=c3383750e33397371f72b46dc1dcc8c0ec51784d;hb=3374cd1abd478f767aaedf2c21d109596ff0fe72;hp=8c51493d1f957d99a3d05432275dc266b2819ff1;hpb=88b060d6c03fcb9e4d2018b4349954c4242a5c7f;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 8c51493..c338375 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -76,83 +76,18 @@ 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_early_resume(struct pcmcia_socket *skt);
-static int socket_late_resume(struct pcmcia_socket *skt);
-static int socket_resume(struct pcmcia_socket *skt);
-static int socket_suspend(struct pcmcia_socket *skt);
-
-static void pcmcia_socket_dev_run(struct device *dev,
-				  int (*cb)(struct pcmcia_socket *))
-{
-	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);
-		cb(socket);
-		mutex_unlock(&socket->skt_mutex);
-	}
-	up_read(&pcmcia_socket_list_rwsem);
-}
-
-int pcmcia_socket_dev_suspend(struct device *dev)
-{
-	pcmcia_socket_dev_run(dev, socket_suspend);
-	return 0;
-}
-EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
-
-void pcmcia_socket_dev_early_resume(struct device *dev)
-{
-	pcmcia_socket_dev_run(dev, socket_early_resume);
-}
-EXPORT_SYMBOL(pcmcia_socket_dev_early_resume);
-
-void pcmcia_socket_dev_late_resume(struct device *dev)
-{
-	pcmcia_socket_dev_run(dev, socket_late_resume);
-}
-EXPORT_SYMBOL(pcmcia_socket_dev_late_resume);
-
-int pcmcia_socket_dev_resume(struct device *dev)
-{
-	pcmcia_socket_dev_run(dev, socket_resume);
-	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;
+	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 +116,6 @@ 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 +161,13 @@ 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 +219,17 @@ 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);
@@ -389,6 +327,8 @@ static void socket_shutdown(struct pcmcia_socket *s)
 	dev_dbg(&s->dev, "shutdown\n");
 
 	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;
@@ -399,13 +339,21 @@ 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);
@@ -416,7 +364,7 @@ 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)
@@ -505,8 +453,12 @@ 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) {
@@ -524,9 +476,11 @@ 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);
 	}
 
@@ -538,6 +492,7 @@ 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);
@@ -546,26 +501,36 @@ static int socket_suspend(struct pcmcia_socket *skt)
 	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;
+
+	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->state & SOCKET_PRESENT)) {
+		ret = socket_insert(skt);
+		if (ret == -ENODEV)
+			ret = 0;
+		return ret;
+	}
 
 	if (skt->resume_status) {
 		socket_shutdown(skt);
@@ -671,20 +636,26 @@ 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)
@@ -693,10 +664,41 @@ 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_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;
 
@@ -706,6 +708,13 @@ 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);
@@ -731,6 +740,31 @@ 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)
@@ -795,7 +829,10 @@ 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);
@@ -811,146 +848,86 @@ 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)
+static int pcmcia_socket_uevent(struct device *dev,
+				struct kobj_uevent_env *env)
 {
-	int ret;
+	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 
-	dev_dbg(&skt->dev, "suspending socket\n");
+	if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
+		return -ENOMEM;
 
-	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 0;
+}
 
-	return ret;
-} /* suspend_card */
-EXPORT_SYMBOL(pcmcia_suspend_card);
 
+static struct completion pcmcia_unload;
 
-int pcmcia_resume_card(struct pcmcia_socket *skt)
+static void pcmcia_release_socket_class(struct class *data)
 {
-	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);
+	complete(&pcmcia_unload);
+}
 
-	return ret;
-} /* resume_card */
-EXPORT_SYMBOL(pcmcia_resume_card);
 
+#ifdef CONFIG_PM
 
-/* These handle user requests to eject or insert a card. */
-int pcmcia_eject_card(struct pcmcia_socket *skt)
+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;
 
-	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);
+	mutex_lock(&s->skt_mutex);
+	ret = callback(s);
+	mutex_unlock(&s->skt_mutex);
 
 	return ret;
-} /* eject_card */
-EXPORT_SYMBOL(pcmcia_eject_card);
-
+}
 
-int pcmcia_insert_card(struct pcmcia_socket *skt)
+static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
 {
-	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);
+	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 pcmcia_socket_uevent(struct device *dev,
-				struct kobj_uevent_env *env)
+static int pcmcia_socket_dev_resume(struct device *dev)
 {
-	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
+	return __pcmcia_pm_op(dev, socket_late_resume);
+}
 
-	if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
-		return -ENOMEM;
+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)
 
-	return 0;
-}
+	/* 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,
+};
 
-static struct completion pcmcia_unload;
+#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
 
-static void pcmcia_release_socket_class(struct class *data)
-{
-	complete(&pcmcia_unload);
-}
+#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);