-/*
- * $Id: serio.c,v 1.15 2002/01/22 21:12:03 vojtech Exp $
- *
- * Copyright (c) 1999-2001 Vojtech Pavlik
- */
-
/*
* The Serio abstraction module
+ *
+ * Copyright (c) 1999-2004 Vojtech Pavlik
+ * Copyright (c) 2004 Dmitry Torokhov
+ * Copyright (c) 2003 Daniele Bellucci
*/
/*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
- *
- * Changes:
- * 20 Jul. 2003 Daniele Bellucci <bellucda@tiscali.it>
- * Minor cleanups.
*/
#include <linux/stddef.h>
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_unregister_port);
-EXPORT_SYMBOL(serio_register_device);
-EXPORT_SYMBOL(serio_unregister_device);
+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 */
+static LIST_HEAD(serio_list);
+static LIST_HEAD(serio_driver_list);
+static unsigned int serio_no;
+
+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_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)
+{
+ get_driver(&drv->driver);
+
+ drv->connect(serio, drv);
+ if (serio->drv) {
+ down_write(&serio_bus.subsys.rwsem);
+ serio->dev.driver = &drv->driver;
+ device_bind_driver(&serio->dev);
+ up_write(&serio_bus.subsys.rwsem);
+ return 1;
+ }
+
+ put_driver(&drv->driver);
+ return 0;
+}
+
+/* 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;
+}
+
+/*
+ * Serio event processing.
+ */
+
struct serio_event {
int type;
struct serio *serio;
struct list_head node;
};
-static DECLARE_MUTEX(serio_sem);
-static LIST_HEAD(serio_list);
-static LIST_HEAD(serio_dev_list);
+enum serio_event_type {
+ SERIO_RESCAN,
+ SERIO_RECONNECT,
+ SERIO_REGISTER_PORT,
+ SERIO_UNREGISTER_PORT,
+};
+
+static spinlock_t serio_event_lock = SPIN_LOCK_UNLOCKED; /* protects serio_event_list */
static LIST_HEAD(serio_event_list);
+static DECLARE_WAIT_QUEUE_HEAD(serio_wait);
+static DECLARE_COMPLETION(serio_exited);
static int serio_pid;
-static void serio_find_dev(struct serio *serio)
+static void serio_queue_event(struct serio *serio, int event_type)
{
- struct serio_dev *dev;
+ unsigned long flags;
+ struct serio_event *event;
- list_for_each_entry(dev, &serio_dev_list, node) {
- if (serio->dev)
- break;
- if (dev->connect)
- dev->connect(serio, dev);
- }
-}
+ spin_lock_irqsave(&serio_event_lock, flags);
-#define SERIO_RESCAN 1
-#define SERIO_RECONNECT 2
-#define SERIO_REGISTER_PORT 3
-#define SERIO_UNREGISTER_PORT 4
+ if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) {
+ event->type = event_type;
+ event->serio = serio;
-static DECLARE_WAIT_QUEUE_HEAD(serio_wait);
-static DECLARE_COMPLETION(serio_exited);
+ list_add_tail(&event->node, &serio_event_list);
+ wake_up(&serio_wait);
+ }
+
+ spin_unlock_irqrestore(&serio_event_lock, flags);
+}
-static void serio_invalidate_pending_events(struct serio *serio)
+static struct serio_event *serio_get_event(void)
{
struct serio_event *event;
+ struct list_head *node;
+ unsigned long flags;
+
+ spin_lock_irqsave(&serio_event_lock, flags);
+
+ if (list_empty(&serio_event_list)) {
+ spin_unlock_irqrestore(&serio_event_lock, flags);
+ return NULL;
+ }
+
+ node = serio_event_list.next;
+ event = container_of(node, struct serio_event, node);
+ list_del_init(node);
+
+ spin_unlock_irqrestore(&serio_event_lock, flags);
- list_for_each_entry(event, &serio_event_list, node)
- if (event->serio == serio)
- event->serio = NULL;
+ return event;
}
-void serio_handle_events(void)
+static void serio_handle_events(void)
{
- struct list_head *node, *next;
struct serio_event *event;
- list_for_each_safe(node, next, &serio_event_list) {
- event = container_of(node, struct serio_event, node);
+ while ((event = serio_get_event())) {
down(&serio_sem);
- if (event->serio == NULL)
- goto event_done;
switch (event->type) {
case SERIO_REGISTER_PORT :
- __serio_register_port(event->serio);
+ serio_create_port(event->serio);
+ serio_connect_port(event->serio, NULL);
break;
case SERIO_UNREGISTER_PORT :
- __serio_unregister_port(event->serio);
+ serio_disconnect_port(event->serio);
+ serio_destroy_port(event->serio);
break;
case SERIO_RECONNECT :
- if (event->serio->dev && event->serio->dev->reconnect)
- if (event->serio->dev->reconnect(event->serio) == 0)
- break;
- /* reconnect failed - fall through to rescan */
+ serio_reconnect_port(event->serio);
+ break;
case SERIO_RESCAN :
- if (event->serio->dev && event->serio->dev->disconnect)
- event->serio->dev->disconnect(event->serio);
- serio_find_dev(event->serio);
+ serio_disconnect_port(event->serio);
+ serio_connect_port(event->serio, NULL);
break;
default:
break;
}
-event_done:
+
up(&serio_sem);
- list_del_init(node);
kfree(event);
}
}
+static void serio_remove_pending_events(struct serio *serio)
+{
+ struct list_head *node, *next;
+ struct serio_event *event;
+ unsigned long flags;
+
+ 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) {
+ list_del_init(node);
+ kfree(event);
+ }
+ }
+
+ spin_unlock_irqrestore(&serio_event_lock, flags);
+}
+
+
static int serio_thread(void *nothing)
{
lock_kernel();
complete_and_exit(&serio_exited, 0);
}
-static void serio_queue_event(struct serio *serio, int event_type)
+
+/*
+ * Serio port operations
+ */
+
+static ssize_t serio_show_description(struct device *dev, char *buf)
{
- struct serio_event *event;
+ struct serio *serio = to_serio_port(dev);
+ return sprintf(buf, "%s\n", serio->name);
+}
- if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) {
- event->type = event_type;
- event->serio = serio;
+static ssize_t serio_show_driver(struct device *dev, char *buf)
+{
+ return sprintf(buf, "%s\n", dev->driver ? dev->driver->name : "(none)");
+}
- list_add_tail(&event->node, &serio_event_list);
- wake_up(&serio_wait);
+static ssize_t serio_rebind_driver(struct device *dev, const char *buf, size_t count)
+{
+ struct serio *serio = to_serio_port(dev);
+ struct device_driver *drv;
+ int retval;
+
+ retval = down_interruptible(&serio_sem);
+ if (retval)
+ return retval;
+
+ retval = count;
+ if (!strncmp(buf, "none", count)) {
+ serio_disconnect_port(serio);
+ } else if (!strncmp(buf, "reconnect", count)) {
+ serio_reconnect_port(serio);
+ } else if (!strncmp(buf, "rescan", count)) {
+ serio_disconnect_port(serio);
+ serio_connect_port(serio, NULL);
+ } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
+ serio_disconnect_port(serio);
+ serio_connect_port(serio, to_serio_driver(drv));
+ put_driver(drv);
+ } else {
+ retval = -EINVAL;
}
+
+ up(&serio_sem);
+
+ return retval;
}
-void serio_rescan(struct serio *serio)
+static ssize_t serio_show_bind_mode(struct device *dev, char *buf)
{
- serio_queue_event(serio, SERIO_RESCAN);
+ struct serio *serio = to_serio_port(dev);
+ return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
}
-void serio_reconnect(struct serio *serio)
+static ssize_t serio_set_bind_mode(struct device *dev, const char *buf, size_t count)
{
- serio_queue_event(serio, SERIO_RECONNECT);
+ struct serio *serio = to_serio_port(dev);
+ int retval;
+
+ retval = count;
+ if (!strncmp(buf, "manual", count)) {
+ serio->manual_bind = 1;
+ } else if (!strncmp(buf, "auto", count)) {
+ serio->manual_bind = 0;
+ } else {
+ retval = -EINVAL;
+ }
+
+ return retval;
}
-irqreturn_t serio_interrupt(struct serio *serio,
- unsigned char data, unsigned int flags, struct pt_regs *regs)
+static struct device_attribute serio_device_attrs[] = {
+ __ATTR(description, S_IRUGO, serio_show_description, NULL),
+ __ATTR(driver, S_IWUSR | S_IRUGO, serio_show_driver, serio_rebind_driver),
+ __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
+ __ATTR_NULL
+};
+
+
+static void serio_release_port(struct device *dev)
{
- irqreturn_t ret = IRQ_NONE;
+ struct serio *serio = to_serio_port(dev);
- if (serio->dev && serio->dev->interrupt) {
- ret = serio->dev->interrupt(serio, data, flags, regs);
- } else {
- if (!flags) {
- if ((serio->type == SERIO_8042 ||
- serio->type == SERIO_8042_XL) && (data != 0xaa))
- return ret;
- serio_rescan(serio);
- ret = IRQ_HANDLED;
+ kfree(serio);
+ module_put(THIS_MODULE);
+}
+
+static void serio_create_port(struct serio *serio)
+{
+ try_module_get(THIS_MODULE);
+
+ spin_lock_init(&serio->lock);
+ list_add_tail(&serio->node, &serio_list);
+ snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id), "serio%d", serio_no++);
+ 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
+ */
+static void serio_destroy_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);
+ }
+
+ device_unregister(&serio->dev);
+}
+
+/*
+ * 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.
+ */
+static void serio_connect_port(struct serio *serio, struct serio_driver *drv)
+{
+ WARN_ON(serio->drv);
+ WARN_ON(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;
+
+ WARN_ON(serio->drv);
+ WARN_ON(serio->child);
+
+ serio_create_port(serio);
+
+ 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);
}
}
- return ret;
+}
+
+/*
+ *
+ */
+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);
+ /* Ok, old children are now gone, we are done */
+ break;
+ }
+ serio = serio->child;
+ } while (serio);
+}
+
+/*
+ * serio_disconnect_port() unbinds a port from its driver. As a side effect
+ * all child ports are unbound and destroyed.
+ */
+static void serio_disconnect_port(struct serio *serio)
+{
+ struct serio_driver *drv = serio->drv;
+ struct serio *s;
+
+ if (serio->child) {
+ /*
+ * Children ports should be disconnected and destroyed
+ * first, staring with the leaf one, since we don't want
+ * to do recursion
+ */
+ do {
+ s = serio->child;
+ } while (s->child);
+
+ while (s != serio) {
+ s = s->parent;
+ serio_destroy_port(s->child);
+ }
+ }
+
+ /*
+ * 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);
+ }
+}
+
+void serio_rescan(struct serio *serio)
+{
+ serio_queue_event(serio, 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_register_port(serio);
+ serio_create_port(serio);
+ serio_connect_port(serio, NULL);
up(&serio_sem);
}
serio_queue_event(serio, SERIO_REGISTER_PORT);
}
-/*
- * Should only be called directly if serio_sem has already been taken,
- * for example when unregistering a serio from other input device's
- * connect() function.
- */
-void __serio_register_port(struct serio *serio)
-{
- list_add_tail(&serio->node, &serio_list);
- serio_find_dev(serio);
-}
-
void serio_unregister_port(struct serio *serio)
{
down(&serio_sem);
- __serio_unregister_port(serio);
+ serio_disconnect_port(serio);
+ serio_destroy_port(serio);
up(&serio_sem);
}
serio_queue_event(serio, SERIO_UNREGISTER_PORT);
}
+
/*
- * Should only be called directly if serio_sem has already been taken,
- * for example when unregistering a serio from other input device's
- * disconnect() function.
+ * Serio driver operations
*/
-void __serio_unregister_port(struct serio *serio)
+
+static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf)
{
- serio_invalidate_pending_events(serio);
- list_del_init(&serio->node);
- if (serio->dev && serio->dev->disconnect)
- serio->dev->disconnect(serio);
+ struct serio_driver *driver = to_serio_driver(drv);
+ return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
+}
+
+static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf)
+{
+ struct serio_driver *serio_drv = to_serio_driver(drv);
+ return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto");
}
-void serio_register_device(struct serio_dev *dev)
+static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count)
+{
+ struct serio_driver *serio_drv = to_serio_driver(drv);
+ int retval;
+
+ retval = count;
+ if (!strncmp(buf, "manual", count)) {
+ serio_drv->manual_bind = 1;
+ } else if (!strncmp(buf, "auto", count)) {
+ serio_drv->manual_bind = 0;
+ } else {
+ retval = -EINVAL;
+ }
+
+ return retval;
+}
+
+
+static struct driver_attribute serio_driver_attrs[] = {
+ __ATTR(description, S_IRUGO, serio_driver_show_description, NULL),
+ __ATTR(bind_mode, S_IWUSR | S_IRUGO,
+ serio_driver_show_bind_mode, serio_driver_set_bind_mode),
+ __ATTR_NULL
+};
+
+void serio_register_driver(struct serio_driver *drv)
{
struct serio *serio;
+
down(&serio_sem);
- list_add_tail(&dev->node, &serio_dev_list);
- list_for_each_entry(serio, &serio_list, node)
- if (!serio->dev && dev->connect)
- dev->connect(serio, dev);
+
+ list_add_tail(&drv->node, &serio_driver_list);
+
+ drv->driver.bus = &serio_bus;
+ driver_register(&drv->driver);
+
+ if (drv->manual_bind)
+ goto out;
+
+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;
+ }
+ }
+
+out:
up(&serio_sem);
}
-void serio_unregister_device(struct serio_dev *dev)
+void serio_unregister_driver(struct serio_driver *drv)
{
struct serio *serio;
down(&serio_sem);
- list_del_init(&dev->node);
+ list_del_init(&drv->node);
+
+start_over:
list_for_each_entry(serio, &serio_list, node) {
- if (serio->dev == dev && dev->disconnect)
- dev->disconnect(serio);
- serio_find_dev(serio);
+ if (serio->drv == drv) {
+ serio_disconnect_port(serio);
+ serio_connect_port(serio, NULL);
+ /* we could've deleted some ports, restart */
+ goto start_over;
+ }
}
+
+ driver_unregister(&drv->driver);
+
up(&serio_sem);
}
-/* called from serio_dev->connect/disconnect methods under serio_sem */
-int serio_open(struct serio *serio, struct serio_dev *dev)
+/* called from serio_driver->connect/disconnect methods under serio_sem */
+int serio_open(struct serio *serio, struct serio_driver *drv)
{
- serio->dev = dev;
+ serio_pause_rx(serio);
+ serio->drv = drv;
+ serio_continue_rx(serio);
+
if (serio->open && serio->open(serio)) {
- serio->dev = NULL;
+ serio_pause_rx(serio);
+ serio->drv = NULL;
+ serio_continue_rx(serio);
return -1;
}
return 0;
}
-/* called from serio_dev->connect/disconnect methods under serio_sem */
+/* called from serio_driver->connect/disconnect methods under serio_sem */
void serio_close(struct serio *serio)
{
if (serio->close)
serio->close(serio);
- serio->dev = NULL;
+
+ serio_pause_rx(serio);
+ serio->drv = NULL;
+ serio_continue_rx(serio);
}
-static int __init serio_init(void)
+irqreturn_t serio_interrupt(struct serio *serio,
+ unsigned char data, unsigned int dfl, struct pt_regs *regs)
{
- int pid;
+ unsigned long flags;
+ irqreturn_t ret = IRQ_NONE;
+
+ spin_lock_irqsave(&serio->lock, flags);
+
+ 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;
+ }
+ }
+ }
+
+ spin_unlock_irqrestore(&serio->lock, flags);
- pid = kernel_thread(serio_thread, NULL, CLONE_KERNEL);
+ return ret;
+}
- if (!pid) {
+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");
return -1;
}
- serio_pid = pid;
+ serio_bus.dev_attrs = serio_device_attrs;
+ serio_bus.drv_attrs = serio_driver_attrs;
+ bus_register(&serio_bus);
return 0;
}
static void __exit serio_exit(void)
{
+ bus_unregister(&serio_bus);
kill_proc(serio_pid, SIGTERM, 1);
wait_for_completion(&serio_exited);
}
git://git.onelab.eu / linux-2.6.git / blobdiff