| /* |
| * The Serio abstraction module |
| * |
| * Copyright (c) 1999-2004 Vojtech Pavlik |
| * Copyright (c) 2004 Dmitry Torokhov |
| * Copyright (c) 2003 Daniele Bellucci |
| */ |
| |
| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * 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 |
| */ |
| |
| #include <linux/stddef.h> |
| #include <linux/module.h> |
| #include <linux/serio.h> |
| #include <linux/errno.h> |
| #include <linux/wait.h> |
| #include <linux/completion.h> |
| #include <linux/sched.h> |
| #include <linux/smp_lock.h> |
| #include <linux/slab.h> |
| |
| MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| MODULE_DESCRIPTION("Serio abstraction core"); |
| MODULE_LICENSE("GPL"); |
| |
| EXPORT_SYMBOL(serio_interrupt); |
| 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_driver); |
| EXPORT_SYMBOL(serio_open); |
| EXPORT_SYMBOL(serio_close); |
| EXPORT_SYMBOL(serio_rescan); |
| EXPORT_SYMBOL(serio_reconnect); |
| |
| /* |
| * 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 struct bus_type serio_bus = { |
| .name = "serio", |
| }; |
| |
| static void serio_add_port(struct serio *serio); |
| static void serio_destroy_port(struct serio *serio); |
| static void serio_reconnect_port(struct serio *serio); |
| static void serio_disconnect_port(struct serio *serio); |
| |
| static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
| { |
| 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; |
| } |
| |
| /* |
| * 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); |
| } |
| out: |
| up_write(&serio_bus.subsys.rwsem); |
| } |
| |
| 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); |
| } |
| |
| static void serio_find_driver(struct serio *serio) |
| { |
| down_write(&serio_bus.subsys.rwsem); |
| device_attach(&serio->dev); |
| up_write(&serio_bus.subsys.rwsem); |
| } |
| |
| |
| /* |
| * Serio event processing. |
| */ |
| |
| 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 LIST_HEAD(serio_event_list); |
| static DECLARE_WAIT_QUEUE_HEAD(serio_wait); |
| static DECLARE_COMPLETION(serio_exited); |
| static int serio_pid; |
| |
| 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->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; |
| 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 = list_entry(node, struct serio_event, node); |
| list_del_init(node); |
| |
| spin_unlock_irqrestore(&serio_event_lock, flags); |
| |
| return event; |
| } |
| |
| static void serio_handle_events(void) |
| { |
| struct serio_event *event; |
| struct serio_driver *serio_drv; |
| |
| down(&serio_sem); |
| |
| while ((event = serio_get_event())) { |
| |
| switch (event->type) { |
| 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_RECONNECT: |
| serio_reconnect_port(event->object); |
| break; |
| |
| case SERIO_RESCAN: |
| serio_disconnect_port(event->object); |
| serio_find_driver(event->object); |
| break; |
| |
| case SERIO_REGISTER_DRIVER: |
| serio_drv = event->object; |
| driver_register(&serio_drv->driver); |
| break; |
| |
| default: |
| break; |
| } |
| |
| 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; |
| struct serio_event *event; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&serio_event_lock, flags); |
| |
| list_for_each_safe(node, next, &serio_event_list) { |
| event = list_entry(node, struct serio_event, node); |
| if (event->object == serio) { |
| list_del_init(node); |
| 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) |
| { |
| lock_kernel(); |
| daemonize("kseriod"); |
| allow_signal(SIGTERM); |
| |
| do { |
| serio_handle_events(); |
| wait_event_interruptible(serio_wait, !list_empty(&serio_event_list)); |
| try_to_freeze(); |
| } while (!signal_pending(current)); |
| |
| printk(KERN_DEBUG "serio: kseriod exiting\n"); |
| |
| unlock_kernel(); |
| complete_and_exit(&serio_exited, 0); |
| } |
| |
| |
| /* |
| * Serio port operations |
| */ |
| |
| static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct serio *serio = to_serio_port(dev); |
| return sprintf(buf, "%s\n", serio->name); |
| } |
| |
| static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, 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, struct device_attribute *attr, 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, struct device_attribute *attr, 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, struct device_attribute *attr, 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, struct device_attribute *attr, 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_find_driver(serio); |
| } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { |
| serio_disconnect_port(serio); |
| serio_bind_driver(serio, to_serio_driver(drv)); |
| put_driver(drv); |
| } else { |
| retval = -EINVAL; |
| } |
| |
| up(&serio_sem); |
| |
| return retval; |
| } |
| |
| static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct serio *serio = to_serio_port(dev); |
| return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); |
| } |
| |
| static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
| { |
| 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; |
| } |
| |
| static struct device_attribute serio_device_attrs[] = { |
| __ATTR(description, S_IRUGO, serio_show_description, NULL), |
| __ATTR(drvctl, S_IWUSR, NULL, 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) |
| { |
| struct serio *serio = to_serio_port(dev); |
| |
| kfree(serio); |
| module_put(THIS_MODULE); |
| } |
| |
| /* |
| * Prepare serio port for registration. |
| */ |
| static void serio_init_port(struct serio *serio) |
| { |
| static atomic_t serio_no = ATOMIC_INIT(0); |
| |
| __module_get(THIS_MODULE); |
| |
| spin_lock_init(&serio->lock); |
| init_MUTEX(&serio->drv_sem); |
| 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; |
| } |
| |
| /* |
| * Complete serio port registration. |
| * Driver core will attempt to find appropriate driver for the port. |
| */ |
| static void serio_add_port(struct serio *serio) |
| { |
| if (serio->parent) { |
| serio_pause_rx(serio->parent); |
| serio->parent->child = serio; |
| serio_continue_rx(serio->parent); |
| } |
| |
| 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_destroy_port() completes deregistration process and removes |
| * port from the system |
| */ |
| static void serio_destroy_port(struct serio *serio) |
| { |
| struct serio *child; |
| |
| child = serio_get_pending_child(serio); |
| if (child) { |
| serio_remove_pending_events(child); |
| put_device(&child->dev); |
| } |
| |
| if (serio->stop) |
| serio->stop(serio); |
| |
| if (serio->parent) { |
| serio_pause_rx(serio->parent); |
| serio->parent->child = NULL; |
| serio_continue_rx(serio->parent); |
| serio->parent = NULL; |
| } |
| |
| 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_find_driver(serio); |
| /* 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 *s, *parent; |
| |
| if (serio->child) { |
| /* |
| * Children ports should be disconnected and destroyed |
| * first, staring with the leaf one, since we don't want |
| * to do recursion |
| */ |
| for (s = serio; s->child; s = s->child) |
| /* empty */; |
| |
| do { |
| parent = s->parent; |
| |
| serio_release_driver(s); |
| serio_destroy_port(s); |
| } while ((s = parent) != serio); |
| } |
| |
| /* |
| * Ok, no children left, now disconnect this port |
| */ |
| serio_release_driver(serio); |
| } |
| |
| void serio_rescan(struct serio *serio) |
| { |
| serio_queue_event(serio, NULL, SERIO_RESCAN); |
| } |
| |
| void serio_reconnect(struct serio *serio) |
| { |
| serio_queue_event(serio, NULL, SERIO_RECONNECT); |
| } |
| |
| /* |
| * Submits register request to kseriod for subsequent execution. |
| * Note that port registration is always asynchronous. |
| */ |
| void __serio_register_port(struct serio *serio, struct module *owner) |
| { |
| 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); |
| serio_disconnect_port(serio); |
| serio_destroy_port(serio); |
| up(&serio_sem); |
| } |
| |
| /* |
| * 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, struct module *owner) |
| { |
| serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT); |
| } |
| |
| |
| /* |
| * Serio driver operations |
| */ |
| |
| static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) |
| { |
| 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"); |
| } |
| |
| 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 |
| }; |
| |
| static int serio_driver_probe(struct device *dev) |
| { |
| struct serio *serio = to_serio_port(dev); |
| struct serio_driver *drv = to_serio_driver(dev->driver); |
| |
| return drv->connect(serio, drv); |
| } |
| |
| static int serio_driver_remove(struct device *dev) |
| { |
| struct serio *serio = to_serio_port(dev); |
| struct serio_driver *drv = to_serio_driver(dev->driver); |
| |
| drv->disconnect(serio); |
| return 0; |
| } |
| |
| 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; |
| |
| serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER); |
| } |
| |
| void serio_unregister_driver(struct serio_driver *drv) |
| { |
| struct serio *serio; |
| |
| down(&serio_sem); |
| 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_find_driver(serio); |
| /* we could've deleted some ports, restart */ |
| goto start_over; |
| } |
| } |
| |
| driver_unregister(&drv->driver); |
| up(&serio_sem); |
| } |
| |
| static void serio_set_drv(struct serio *serio, struct serio_driver *drv) |
| { |
| down(&serio->drv_sem); |
| serio_pause_rx(serio); |
| serio->drv = drv; |
| serio_continue_rx(serio); |
| 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) |
| { |
| serio_set_drv(serio, drv); |
| |
| if (serio->open && serio->open(serio)) { |
| serio_set_drv(serio, NULL); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* called from serio_driver->connect/disconnect methods under serio_sem */ |
| void serio_close(struct serio *serio) |
| { |
| if (serio->close) |
| serio->close(serio); |
| |
| serio_set_drv(serio, NULL); |
| } |
| |
| irqreturn_t serio_interrupt(struct serio *serio, |
| unsigned char data, unsigned int dfl, struct pt_regs *regs) |
| { |
| 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 && serio->registered) { |
| serio_rescan(serio); |
| ret = IRQ_HANDLED; |
| } |
| |
| spin_unlock_irqrestore(&serio->lock, flags); |
| |
| return ret; |
| } |
| |
| static int __init serio_init(void) |
| { |
| if (!(serio_pid = kernel_thread(serio_thread, NULL, CLONE_KERNEL))) { |
| 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; |
| } |
| |
| static void __exit serio_exit(void) |
| { |
| bus_unregister(&serio_bus); |
| kill_proc(serio_pid, SIGTERM, 1); |
| wait_for_completion(&serio_exited); |
| } |
| |
| module_init(serio_init); |
| module_exit(serio_exit); |