MODULE_LICENSE("GPL");
EXPORT_SYMBOL(serio_interrupt);
-EXPORT_SYMBOL(serio_register_port);
-EXPORT_SYMBOL(serio_register_port_delayed);
+EXPORT_SYMBOL(__serio_register_port);
EXPORT_SYMBOL(serio_unregister_port);
-EXPORT_SYMBOL(serio_unregister_port_delayed);
-EXPORT_SYMBOL(serio_register_driver);
+EXPORT_SYMBOL(__serio_unregister_port_delayed);
+EXPORT_SYMBOL(__serio_register_driver);
EXPORT_SYMBOL(serio_unregister_driver);
EXPORT_SYMBOL(serio_open);
EXPORT_SYMBOL(serio_close);
EXPORT_SYMBOL(serio_rescan);
EXPORT_SYMBOL(serio_reconnect);
-static DECLARE_MUTEX(serio_sem); /* protects serio_list and serio_diriver_list */
+/*
+ * serio_sem protects entire serio subsystem and is taken every time
+ * serio port or driver registrered or unregistered.
+ */
+static DECLARE_MUTEX(serio_sem);
+
static LIST_HEAD(serio_list);
-static LIST_HEAD(serio_driver_list);
-static unsigned int serio_no;
-struct bus_type serio_bus = {
+static struct bus_type serio_bus = {
.name = "serio",
};
-static void serio_find_driver(struct serio *serio);
-static void serio_create_port(struct serio *serio);
+static void serio_add_port(struct serio *serio);
static void serio_destroy_port(struct serio *serio);
-static void serio_connect_port(struct serio *serio, struct serio_driver *drv);
static void serio_reconnect_port(struct serio *serio);
static void serio_disconnect_port(struct serio *serio);
-static int serio_bind_driver(struct serio *serio, struct serio_driver *drv)
+static int serio_match_port(const struct serio_device_id *ids, struct serio *serio)
{
- get_driver(&drv->driver);
+ while (ids->type || ids->proto) {
+ if ((ids->type == SERIO_ANY || ids->type == serio->id.type) &&
+ (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) &&
+ (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) &&
+ (ids->id == SERIO_ANY || ids->id == serio->id.id))
+ return 1;
+ ids++;
+ }
+ return 0;
+}
- drv->connect(serio, drv);
- if (serio->drv) {
- down_write(&serio_bus.subsys.rwsem);
+/*
+ * Basic serio -> driver core mappings
+ */
+
+static void serio_bind_driver(struct serio *serio, struct serio_driver *drv)
+{
+ down_write(&serio_bus.subsys.rwsem);
+
+ if (serio_match_port(drv->id_table, serio)) {
serio->dev.driver = &drv->driver;
+ if (drv->connect(serio, drv)) {
+ serio->dev.driver = NULL;
+ goto out;
+ }
device_bind_driver(&serio->dev);
- up_write(&serio_bus.subsys.rwsem);
- return 1;
}
+out:
+ up_write(&serio_bus.subsys.rwsem);
+}
- put_driver(&drv->driver);
- return 0;
+static void serio_release_driver(struct serio *serio)
+{
+ down_write(&serio_bus.subsys.rwsem);
+ device_release_driver(&serio->dev);
+ up_write(&serio_bus.subsys.rwsem);
}
-/* serio_find_driver() must be called with serio_sem down. */
static void serio_find_driver(struct serio *serio)
{
- struct serio_driver *drv;
-
- list_for_each_entry(drv, &serio_driver_list, node)
- if (!drv->manual_bind)
- if (serio_bind_driver(serio, drv))
- break;
+ down_write(&serio_bus.subsys.rwsem);
+ device_attach(&serio->dev);
+ up_write(&serio_bus.subsys.rwsem);
}
+
/*
* Serio event processing.
*/
-struct serio_event {
- int type;
- struct serio *serio;
- struct list_head node;
-};
-
enum serio_event_type {
SERIO_RESCAN,
SERIO_RECONNECT,
SERIO_REGISTER_PORT,
SERIO_UNREGISTER_PORT,
+ SERIO_REGISTER_DRIVER,
+};
+
+struct serio_event {
+ enum serio_event_type type;
+ void *object;
+ struct module *owner;
+ struct list_head node;
};
static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */
static DECLARE_COMPLETION(serio_exited);
static int serio_pid;
-static void serio_queue_event(struct serio *serio, int event_type)
+static void serio_queue_event(void *object, struct module *owner,
+ enum serio_event_type event_type)
{
unsigned long flags;
struct serio_event *event;
spin_lock_irqsave(&serio_event_lock, flags);
+ /*
+ * Scan event list for the other events for the same serio port,
+ * starting with the most recent one. If event is the same we
+ * do not need add new one. If event is of different type we
+ * need to add this event and should not look further because
+ * we need to preseve sequence of distinct events.
+ */
+ list_for_each_entry_reverse(event, &serio_event_list, node) {
+ if (event->object == object) {
+ if (event->type == event_type)
+ goto out;
+ break;
+ }
+ }
+
if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) {
+ if (!try_module_get(owner)) {
+ printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type);
+ goto out;
+ }
+
event->type = event_type;
- event->serio = serio;
+ event->object = object;
+ event->owner = owner;
list_add_tail(&event->node, &serio_event_list);
wake_up(&serio_wait);
+ } else {
+ printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type);
+ }
+out:
+ spin_unlock_irqrestore(&serio_event_lock, flags);
+}
+
+static void serio_free_event(struct serio_event *event)
+{
+ module_put(event->owner);
+ kfree(event);
+}
+
+static void serio_remove_duplicate_events(struct serio_event *event)
+{
+ struct list_head *node, *next;
+ struct serio_event *e;
+ unsigned long flags;
+
+ spin_lock_irqsave(&serio_event_lock, flags);
+
+ list_for_each_safe(node, next, &serio_event_list) {
+ e = list_entry(node, struct serio_event, node);
+ if (event->object == e->object) {
+ /*
+ * If this event is of different type we should not
+ * look further - we only suppress duplicate events
+ * that were sent back-to-back.
+ */
+ if (event->type != e->type)
+ break;
+
+ list_del_init(node);
+ serio_free_event(e);
+ }
}
spin_unlock_irqrestore(&serio_event_lock, flags);
}
+
static struct serio_event *serio_get_event(void)
{
struct serio_event *event;
}
node = serio_event_list.next;
- event = container_of(node, struct serio_event, node);
+ event = list_entry(node, struct serio_event, node);
list_del_init(node);
spin_unlock_irqrestore(&serio_event_lock, flags);
static void serio_handle_events(void)
{
struct serio_event *event;
+ struct serio_driver *serio_drv;
- while ((event = serio_get_event())) {
+ down(&serio_sem);
- down(&serio_sem);
+ while ((event = serio_get_event())) {
switch (event->type) {
- case SERIO_REGISTER_PORT :
- serio_create_port(event->serio);
- serio_connect_port(event->serio, NULL);
+ case SERIO_REGISTER_PORT:
+ serio_add_port(event->object);
+ break;
+
+ case SERIO_UNREGISTER_PORT:
+ serio_disconnect_port(event->object);
+ serio_destroy_port(event->object);
break;
- case SERIO_UNREGISTER_PORT :
- serio_disconnect_port(event->serio);
- serio_destroy_port(event->serio);
+ case SERIO_RECONNECT:
+ serio_reconnect_port(event->object);
break;
- case SERIO_RECONNECT :
- serio_reconnect_port(event->serio);
+ case SERIO_RESCAN:
+ serio_disconnect_port(event->object);
+ serio_find_driver(event->object);
break;
- case SERIO_RESCAN :
- serio_disconnect_port(event->serio);
- serio_connect_port(event->serio, NULL);
+ case SERIO_REGISTER_DRIVER:
+ serio_drv = event->object;
+ driver_register(&serio_drv->driver);
break;
+
default:
break;
}
- up(&serio_sem);
- kfree(event);
+ serio_remove_duplicate_events(event);
+ serio_free_event(event);
}
+
+ up(&serio_sem);
}
+/*
+ * Remove all events that have been submitted for a given serio port.
+ */
static void serio_remove_pending_events(struct serio *serio)
{
struct list_head *node, *next;
spin_lock_irqsave(&serio_event_lock, flags);
list_for_each_safe(node, next, &serio_event_list) {
- event = container_of(node, struct serio_event, node);
- if (event->serio == serio) {
+ event = list_entry(node, struct serio_event, node);
+ if (event->object == serio) {
list_del_init(node);
- kfree(event);
+ serio_free_event(event);
}
}
spin_unlock_irqrestore(&serio_event_lock, flags);
}
+/*
+ * Destroy child serio port (if any) that has not been fully registered yet.
+ *
+ * Note that we rely on the fact that port can have only one child and therefore
+ * only one child registration request can be pending. Additionally, children
+ * are registered by driver's connect() handler so there can't be a grandchild
+ * pending registration together with a child.
+ */
+static struct serio *serio_get_pending_child(struct serio *parent)
+{
+ struct serio_event *event;
+ struct serio *serio, *child = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&serio_event_lock, flags);
+
+ list_for_each_entry(event, &serio_event_list, node) {
+ if (event->type == SERIO_REGISTER_PORT) {
+ serio = event->object;
+ if (serio->parent == parent) {
+ child = serio;
+ break;
+ }
+ }
+ }
+
+ spin_unlock_irqrestore(&serio_event_lock, flags);
+ return child;
+}
static int serio_thread(void *nothing)
{
return sprintf(buf, "%s\n", serio->name);
}
+static ssize_t serio_show_id_type(struct device *dev, char *buf)
+{
+ struct serio *serio = to_serio_port(dev);
+ return sprintf(buf, "%02x\n", serio->id.type);
+}
+
+static ssize_t serio_show_id_proto(struct device *dev, char *buf)
+{
+ struct serio *serio = to_serio_port(dev);
+ return sprintf(buf, "%02x\n", serio->id.proto);
+}
+
+static ssize_t serio_show_id_id(struct device *dev, char *buf)
+{
+ struct serio *serio = to_serio_port(dev);
+ return sprintf(buf, "%02x\n", serio->id.id);
+}
+
+static ssize_t serio_show_id_extra(struct device *dev, char *buf)
+{
+ struct serio *serio = to_serio_port(dev);
+ return sprintf(buf, "%02x\n", serio->id.extra);
+}
+
+static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL);
+static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL);
+static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL);
+static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL);
+
+static struct attribute *serio_device_id_attrs[] = {
+ &dev_attr_type.attr,
+ &dev_attr_proto.attr,
+ &dev_attr_id.attr,
+ &dev_attr_extra.attr,
+ NULL
+};
+
+static struct attribute_group serio_id_attr_group = {
+ .name = "id",
+ .attrs = serio_device_id_attrs,
+};
+
static ssize_t serio_rebind_driver(struct device *dev, const char *buf, size_t count)
{
struct serio *serio = to_serio_port(dev);
serio_reconnect_port(serio);
} else if (!strncmp(buf, "rescan", count)) {
serio_disconnect_port(serio);
- serio_connect_port(serio, NULL);
+ serio_find_driver(serio);
} else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
serio_disconnect_port(serio);
- serio_connect_port(serio, to_serio_driver(drv));
+ serio_bind_driver(serio, to_serio_driver(drv));
put_driver(drv);
} else {
retval = -EINVAL;
module_put(THIS_MODULE);
}
-static void serio_create_port(struct serio *serio)
+/*
+ * Prepare serio port for registration.
+ */
+static void serio_init_port(struct serio *serio)
{
- try_module_get(THIS_MODULE);
+ static atomic_t serio_no = ATOMIC_INIT(0);
+
+ __module_get(THIS_MODULE);
spin_lock_init(&serio->lock);
init_MUTEX(&serio->drv_sem);
- list_add_tail(&serio->node, &serio_list);
- snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id), "serio%d", serio_no++);
+ device_initialize(&serio->dev);
+ snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id),
+ "serio%ld", (long)atomic_inc_return(&serio_no) - 1);
serio->dev.bus = &serio_bus;
serio->dev.release = serio_release_port;
if (serio->parent)
serio->dev.parent = &serio->parent->dev;
- device_register(&serio->dev);
}
/*
- * serio_destroy_port() completes deregistration process and removes
- * port from the system
+ * Complete serio port registration.
+ * Driver core will attempt to find appropriate driver for the port.
*/
-static void serio_destroy_port(struct serio *serio)
+static void serio_add_port(struct serio *serio)
{
- struct serio_driver *drv = serio->drv;
- unsigned long flags;
-
- serio_remove_pending_events(serio);
- list_del_init(&serio->node);
-
- if (drv) {
- drv->disconnect(serio);
- down_write(&serio_bus.subsys.rwsem);
- device_release_driver(&serio->dev);
- up_write(&serio_bus.subsys.rwsem);
- put_driver(&drv->driver);
- }
-
if (serio->parent) {
- spin_lock_irqsave(&serio->parent->lock, flags);
- serio->parent->child = NULL;
- spin_unlock_irqrestore(&serio->parent->lock, flags);
+ serio_pause_rx(serio->parent);
+ serio->parent->child = serio;
+ serio_continue_rx(serio->parent);
}
- device_unregister(&serio->dev);
+ list_add_tail(&serio->node, &serio_list);
+ if (serio->start)
+ serio->start(serio);
+ device_add(&serio->dev);
+ sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group);
+ serio->registered = 1;
}
/*
- * serio_connect_port() tries to bind the port and possible all its
- * children to appropriate drivers. If driver passed in the function will not
- * try otehr drivers when binding parent port.
+ * serio_destroy_port() completes deregistration process and removes
+ * port from the system
*/
-static void serio_connect_port(struct serio *serio, struct serio_driver *drv)
+static void serio_destroy_port(struct serio *serio)
{
- WARN_ON(serio->drv);
- WARN_ON(serio->child);
+ struct serio *child;
- if (drv)
- serio_bind_driver(serio, drv);
- else if (!serio->manual_bind)
- serio_find_driver(serio);
-
- /* Ok, now bind children, if any */
- while (serio->child) {
- serio = serio->child;
+ child = serio_get_pending_child(serio);
+ if (child) {
+ serio_remove_pending_events(child);
+ put_device(&child->dev);
+ }
- WARN_ON(serio->drv);
- WARN_ON(serio->child);
+ if (serio->stop)
+ serio->stop(serio);
- serio_create_port(serio);
+ if (serio->parent) {
+ serio_pause_rx(serio->parent);
+ serio->parent->child = NULL;
+ serio_continue_rx(serio->parent);
+ serio->parent = NULL;
+ }
- if (!serio->manual_bind) {
- /*
- * With children we just _prefer_ passed in driver,
- * but we will try other options in case preferred
- * is not the one
- */
- if (!drv || !serio_bind_driver(serio, drv))
- serio_find_driver(serio);
- }
+ if (serio->registered) {
+ sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group);
+ device_del(&serio->dev);
+ list_del_init(&serio->node);
+ serio->registered = 0;
}
+
+ serio_remove_pending_events(serio);
+ put_device(&serio->dev);
}
/*
- *
+ * Reconnect serio port and all its children (re-initialize attached devices)
*/
static void serio_reconnect_port(struct serio *serio)
{
do {
if (!serio->drv || !serio->drv->reconnect || serio->drv->reconnect(serio)) {
serio_disconnect_port(serio);
- serio_connect_port(serio, NULL);
+ serio_find_driver(serio);
/* Ok, old children are now gone, we are done */
break;
}
*/
static void serio_disconnect_port(struct serio *serio)
{
- struct serio_driver *drv = serio->drv;
- struct serio *s;
+ struct serio *s, *parent;
if (serio->child) {
/*
* first, staring with the leaf one, since we don't want
* to do recursion
*/
+ for (s = serio; s->child; s = s->child)
+ /* empty */;
+
do {
- s = serio->child;
- } while (s->child);
+ parent = s->parent;
- while (s != serio) {
- s = s->parent;
- serio_destroy_port(s->child);
- }
+ serio_release_driver(s);
+ serio_destroy_port(s);
+ } while ((s = parent) != serio);
}
/*
* Ok, no children left, now disconnect this port
*/
- if (drv) {
- drv->disconnect(serio);
- down_write(&serio_bus.subsys.rwsem);
- device_release_driver(&serio->dev);
- up_write(&serio_bus.subsys.rwsem);
- put_driver(&drv->driver);
- }
+ serio_release_driver(serio);
}
void serio_rescan(struct serio *serio)
{
- serio_queue_event(serio, SERIO_RESCAN);
+ serio_queue_event(serio, NULL, SERIO_RESCAN);
}
void serio_reconnect(struct serio *serio)
{
- serio_queue_event(serio, SERIO_RECONNECT);
-}
-
-void serio_register_port(struct serio *serio)
-{
- down(&serio_sem);
- serio_create_port(serio);
- serio_connect_port(serio, NULL);
- up(&serio_sem);
+ serio_queue_event(serio, NULL, SERIO_RECONNECT);
}
/*
* Submits register request to kseriod for subsequent execution.
- * Can be used when it is not obvious whether the serio_sem is
- * taken or not and when delayed execution is feasible.
+ * Note that port registration is always asynchronous.
*/
-void serio_register_port_delayed(struct serio *serio)
+void __serio_register_port(struct serio *serio, struct module *owner)
{
- serio_queue_event(serio, SERIO_REGISTER_PORT);
+ serio_init_port(serio);
+ serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
}
+/*
+ * Synchronously unregisters serio port.
+ */
void serio_unregister_port(struct serio *serio)
{
down(&serio_sem);
}
/*
- * Submits unregister request to kseriod for subsequent execution.
+ * Submits register request to kseriod for subsequent execution.
* Can be used when it is not obvious whether the serio_sem is
* taken or not and when delayed execution is feasible.
*/
-void serio_unregister_port_delayed(struct serio *serio)
+void __serio_unregister_port_delayed(struct serio *serio, struct module *owner)
{
- serio_queue_event(serio, SERIO_UNREGISTER_PORT);
+ serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT);
}
__ATTR_NULL
};
-void serio_register_driver(struct serio_driver *drv)
+static int serio_driver_probe(struct device *dev)
{
- struct serio *serio;
-
- down(&serio_sem);
+ struct serio *serio = to_serio_port(dev);
+ struct serio_driver *drv = to_serio_driver(dev->driver);
- list_add_tail(&drv->node, &serio_driver_list);
+ return drv->connect(serio, drv);
+}
- drv->driver.bus = &serio_bus;
- driver_register(&drv->driver);
+static int serio_driver_remove(struct device *dev)
+{
+ struct serio *serio = to_serio_port(dev);
+ struct serio_driver *drv = to_serio_driver(dev->driver);
- if (drv->manual_bind)
- goto out;
+ drv->disconnect(serio);
+ return 0;
+}
-start_over:
- list_for_each_entry(serio, &serio_list, node) {
- if (!serio->drv) {
- serio_connect_port(serio, drv);
- /*
- * if new child appeared then the list is changed,
- * we need to start over
- */
- if (serio->child)
- goto start_over;
- }
- }
+void __serio_register_driver(struct serio_driver *drv, struct module *owner)
+{
+ drv->driver.bus = &serio_bus;
+ drv->driver.probe = serio_driver_probe;
+ drv->driver.remove = serio_driver_remove;
-out:
- up(&serio_sem);
+ serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER);
}
void serio_unregister_driver(struct serio_driver *drv)
struct serio *serio;
down(&serio_sem);
-
- list_del_init(&drv->node);
+ drv->manual_bind = 1; /* so serio_find_driver ignores it */
start_over:
list_for_each_entry(serio, &serio_list, node) {
if (serio->drv == drv) {
serio_disconnect_port(serio);
- serio_connect_port(serio, NULL);
+ serio_find_driver(serio);
/* we could've deleted some ports, restart */
goto start_over;
}
}
driver_unregister(&drv->driver);
-
up(&serio_sem);
}
up(&serio->drv_sem);
}
+static int serio_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct serio *serio = to_serio_port(dev);
+ struct serio_driver *serio_drv = to_serio_driver(drv);
+
+ if (serio->manual_bind || serio_drv->manual_bind)
+ return 0;
+
+ return serio_match_port(serio_drv->id_table, serio);
+}
+
+#ifdef CONFIG_HOTPLUG
+
+#define PUT_ENVP(fmt, val) \
+do { \
+ envp[i++] = buffer; \
+ length += snprintf(buffer, buffer_size - length, fmt, val); \
+ if (buffer_size - length <= 0 || i >= num_envp) \
+ return -ENOMEM; \
+ length++; \
+ buffer += length; \
+} while (0)
+static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
+{
+ struct serio *serio;
+ int i = 0;
+ int length = 0;
+
+ if (!dev)
+ return -ENODEV;
+
+ serio = to_serio_port(dev);
+
+ PUT_ENVP("SERIO_TYPE=%02x", serio->id.type);
+ PUT_ENVP("SERIO_PROTO=%02x", serio->id.proto);
+ PUT_ENVP("SERIO_ID=%02x", serio->id.id);
+ PUT_ENVP("SERIO_EXTRA=%02x", serio->id.extra);
+
+ envp[i] = NULL;
+
+ return 0;
+}
+#undef PUT_ENVP
+
+#else
+
+static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_HOTPLUG */
+
+static int serio_resume(struct device *dev)
+{
+ struct serio *serio = to_serio_port(dev);
+
+ if (!serio->drv || !serio->drv->reconnect || serio->drv->reconnect(serio)) {
+ /*
+ * Driver re-probing can take a while, so better let kseriod
+ * deal with it.
+ */
+ serio_rescan(serio);
+ }
+
+ return 0;
+}
+
/* called from serio_driver->connect/disconnect methods under serio_sem */
int serio_open(struct serio *serio, struct serio_driver *drv)
{
if (likely(serio->drv)) {
ret = serio->drv->interrupt(serio, data, dfl, regs);
- } else {
- if (!dfl) {
- if ((serio->type != SERIO_8042 &&
- serio->type != SERIO_8042_XL) || (data == 0xaa)) {
- serio_rescan(serio);
- ret = IRQ_HANDLED;
- }
- }
+ } else if (!dfl && serio->registered) {
+ serio_rescan(serio);
+ ret = IRQ_HANDLED;
}
spin_unlock_irqrestore(&serio->lock, flags);
static int __init serio_init(void)
{
if (!(serio_pid = kernel_thread(serio_thread, NULL, CLONE_KERNEL))) {
- printk(KERN_WARNING "serio: Failed to start kseriod\n");
+ printk(KERN_ERR "serio: Failed to start kseriod\n");
return -1;
}
serio_bus.dev_attrs = serio_device_attrs;
serio_bus.drv_attrs = serio_driver_attrs;
+ serio_bus.match = serio_bus_match;
+ serio_bus.hotplug = serio_hotplug;
+ serio_bus.resume = serio_resume;
bus_register(&serio_bus);
return 0;
git://git.onelab.eu / linux-2.6.git / blobdiff