diff options
Diffstat (limited to 'drivers/input/serio/serio.c')
| -rw-r--r-- | drivers/input/serio/serio.c | 418 |
1 files changed, 226 insertions, 192 deletions
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c index c3b626e9eae..b29134de983 100644 --- a/drivers/input/serio/serio.c +++ b/drivers/input/serio/serio.c @@ -32,12 +32,10 @@ #include <linux/module.h> #include <linux/serio.h> #include <linux/errno.h> -#include <linux/wait.h> #include <linux/sched.h> #include <linux/slab.h> -#include <linux/kthread.h> +#include <linux/workqueue.h> #include <linux/mutex.h> -#include <linux/freezer.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_DESCRIPTION("Serio abstraction core"); @@ -45,7 +43,7 @@ MODULE_LICENSE("GPL"); /* * serio_mutex protects entire serio subsystem and is taken every time - * serio port or driver registrered or unregistered. + * serio port or driver registered or unregistered. */ static DEFINE_MUTEX(serio_mutex); @@ -56,7 +54,7 @@ static struct bus_type serio_bus; static void serio_add_port(struct serio *serio); static int serio_reconnect_port(struct serio *serio); static void serio_disconnect_port(struct serio *serio); -static void serio_reconnect_chain(struct serio *serio); +static void serio_reconnect_subtree(struct serio *serio); static void serio_attach_driver(struct serio_driver *drv); static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) @@ -152,7 +150,7 @@ static void serio_find_driver(struct serio *serio) enum serio_event_type { SERIO_RESCAN_PORT, SERIO_RECONNECT_PORT, - SERIO_RECONNECT_CHAIN, + SERIO_RECONNECT_SUBTREE, SERIO_REGISTER_PORT, SERIO_ATTACH_DRIVER, }; @@ -166,58 +164,22 @@ struct serio_event { static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ static LIST_HEAD(serio_event_list); -static DECLARE_WAIT_QUEUE_HEAD(serio_wait); -static struct task_struct *serio_task; -static int serio_queue_event(void *object, struct module *owner, - enum serio_event_type event_type) +static struct serio_event *serio_get_event(void) { + struct serio_event *event = NULL; unsigned long flags; - struct serio_event *event; - int retval = 0; 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; - } - } - - event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); - if (!event) { - pr_err("Not enough memory to queue event %d\n", event_type); - retval = -ENOMEM; - goto out; - } - - if (!try_module_get(owner)) { - pr_warning("Can't get module reference, dropping event %d\n", - event_type); - kfree(event); - retval = -EINVAL; - goto out; + if (!list_empty(&serio_event_list)) { + event = list_first_entry(&serio_event_list, + struct serio_event, node); + list_del_init(&event->node); } - event->type = event_type; - event->object = object; - event->owner = owner; - - list_add_tail(&event->node, &serio_event_list); - wake_up(&serio_wait); - -out: spin_unlock_irqrestore(&serio_event_lock, flags); - return retval; + return event; } static void serio_free_event(struct serio_event *event) @@ -226,7 +188,8 @@ static void serio_free_event(struct serio_event *event) kfree(event); } -static void serio_remove_duplicate_events(struct serio_event *event) +static void serio_remove_duplicate_events(void *object, + enum serio_event_type type) { struct serio_event *e, *next; unsigned long flags; @@ -234,13 +197,13 @@ static void serio_remove_duplicate_events(struct serio_event *event) spin_lock_irqsave(&serio_event_lock, flags); list_for_each_entry_safe(e, next, &serio_event_list, node) { - if (event->object == e->object) { + if (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) + if (type != e->type) break; list_del_init(&e->node); @@ -251,25 +214,7 @@ static void serio_remove_duplicate_events(struct serio_event *event) spin_unlock_irqrestore(&serio_event_lock, flags); } - -static struct serio_event *serio_get_event(void) -{ - struct serio_event *event = NULL; - unsigned long flags; - - spin_lock_irqsave(&serio_event_lock, flags); - - if (!list_empty(&serio_event_list)) { - event = list_first_entry(&serio_event_list, - struct serio_event, node); - list_del_init(&event->node); - } - - spin_unlock_irqrestore(&serio_event_lock, flags); - return event; -} - -static void serio_handle_event(void) +static void serio_handle_event(struct work_struct *work) { struct serio_event *event; @@ -292,8 +237,8 @@ static void serio_handle_event(void) serio_find_driver(event->object); break; - case SERIO_RECONNECT_CHAIN: - serio_reconnect_chain(event->object); + case SERIO_RECONNECT_SUBTREE: + serio_reconnect_subtree(event->object); break; case SERIO_ATTACH_DRIVER: @@ -301,13 +246,66 @@ static void serio_handle_event(void) break; } - serio_remove_duplicate_events(event); + serio_remove_duplicate_events(event->object, event->type); serio_free_event(event); } mutex_unlock(&serio_mutex); } +static DECLARE_WORK(serio_event_work, serio_handle_event); + +static int serio_queue_event(void *object, struct module *owner, + enum serio_event_type event_type) +{ + unsigned long flags; + struct serio_event *event; + int retval = 0; + + 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; + } + } + + event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); + if (!event) { + pr_err("Not enough memory to queue event %d\n", event_type); + retval = -ENOMEM; + goto out; + } + + if (!try_module_get(owner)) { + pr_warning("Can't get module reference, dropping event %d\n", + event_type); + kfree(event); + retval = -EINVAL; + goto out; + } + + event->type = event_type; + event->object = object; + event->owner = owner; + + list_add_tail(&event->node, &serio_event_list); + queue_work(system_long_wq, &serio_event_work); + +out: + spin_unlock_irqrestore(&serio_event_lock, flags); + return retval; +} + /* * Remove all events that have been submitted for a given * object, be it serio port or driver. @@ -330,12 +328,10 @@ static void serio_remove_pending_events(void *object) } /* - * Destroy child serio port (if any) that has not been fully registered yet. + * Locate 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. + * 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) { @@ -359,18 +355,6 @@ static struct serio *serio_get_pending_child(struct serio *parent) return child; } -static int serio_thread(void *nothing) -{ - do { - serio_handle_event(); - wait_event_interruptible(serio_wait, - kthread_should_stop() || !list_empty(&serio_event_list)); - } while (!kthread_should_stop()); - - return 0; -} - - /* * Serio port operations */ @@ -381,7 +365,7 @@ static ssize_t serio_show_description(struct device *dev, struct device_attribut return sprintf(buf, "%s\n", serio->name); } -static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) +static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct serio *serio = to_serio_port(dev); @@ -389,54 +373,31 @@ static ssize_t serio_show_modalias(struct device *dev, struct device_attribute * serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); } -static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) +static ssize_t type_show(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) +static ssize_t proto_show(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) +static ssize_t id_show(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) +static ssize_t extra_show(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 const struct attribute_group *serio_device_attr_groups[] = { - &serio_id_attr_group, - NULL -}; - -static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct serio *serio = to_serio_port(dev); struct device_driver *drv; @@ -449,14 +410,15 @@ static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute * if (!strncmp(buf, "none", count)) { serio_disconnect_port(serio); } else if (!strncmp(buf, "reconnect", count)) { - serio_reconnect_chain(serio); + serio_reconnect_subtree(serio); } else if (!strncmp(buf, "rescan", count)) { serio_disconnect_port(serio); serio_find_driver(serio); + serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { serio_disconnect_port(serio); error = serio_bind_driver(serio, to_serio_driver(drv)); - put_driver(drv); + serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); } else { error = -EINVAL; } @@ -489,14 +451,55 @@ static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute * return retval; } -static struct device_attribute serio_device_attrs[] = { - __ATTR(description, S_IRUGO, serio_show_description, NULL), - __ATTR(modalias, S_IRUGO, serio_show_modalias, 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 ssize_t firmware_id_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct serio *serio = to_serio_port(dev); + + return sprintf(buf, "%s\n", serio->firmware_id); +} + +static DEVICE_ATTR_RO(type); +static DEVICE_ATTR_RO(proto); +static DEVICE_ATTR_RO(id); +static DEVICE_ATTR_RO(extra); + +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 DEVICE_ATTR_RO(modalias); +static DEVICE_ATTR_WO(drvctl); +static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL); +static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode); +static DEVICE_ATTR_RO(firmware_id); + +static struct attribute *serio_device_attrs[] = { + &dev_attr_modalias.attr, + &dev_attr_description.attr, + &dev_attr_drvctl.attr, + &dev_attr_bind_mode.attr, + &dev_attr_firmware_id.attr, + NULL }; +static struct attribute_group serio_device_attr_group = { + .attrs = serio_device_attrs, +}; + +static const struct attribute_group *serio_device_attr_groups[] = { + &serio_id_attr_group, + &serio_device_attr_group, + NULL +}; static void serio_release_port(struct device *dev) { @@ -516,6 +519,8 @@ static void serio_init_port(struct serio *serio) __module_get(THIS_MODULE); INIT_LIST_HEAD(&serio->node); + INIT_LIST_HEAD(&serio->child_node); + INIT_LIST_HEAD(&serio->children); spin_lock_init(&serio->lock); mutex_init(&serio->drv_mutex); device_initialize(&serio->dev); @@ -538,12 +543,13 @@ static void serio_init_port(struct serio *serio) */ static void serio_add_port(struct serio *serio) { + struct serio *parent = serio->parent; int error; - if (serio->parent) { - serio_pause_rx(serio->parent); - serio->parent->child = serio; - serio_continue_rx(serio->parent); + if (parent) { + serio_pause_rx(parent); + list_add_tail(&serio->child_node, &parent->children); + serio_continue_rx(parent); } list_add_tail(&serio->node, &serio_list); @@ -559,15 +565,14 @@ static void serio_add_port(struct serio *serio) } /* - * serio_destroy_port() completes deregistration process and removes + * serio_destroy_port() completes unregistration 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) { + while ((child = serio_get_pending_child(serio)) != NULL) { serio_remove_pending_events(child); put_device(&child->dev); } @@ -577,7 +582,7 @@ static void serio_destroy_port(struct serio *serio) if (serio->parent) { serio_pause_rx(serio->parent); - serio->parent->child = NULL; + list_del_init(&serio->child_node); serio_continue_rx(serio->parent); serio->parent = NULL; } @@ -609,46 +614,82 @@ static int serio_reconnect_port(struct serio *serio) } /* - * Reconnect serio port and all its children (re-initialize attached devices) + * Reconnect serio port and all its children (re-initialize attached + * devices). */ -static void serio_reconnect_chain(struct serio *serio) +static void serio_reconnect_subtree(struct serio *root) { + struct serio *s = root; + int error; + do { - if (serio_reconnect_port(serio)) { - /* Ok, old children are now gone, we are done */ - break; + error = serio_reconnect_port(s); + if (!error) { + /* + * Reconnect was successful, move on to do the + * first child. + */ + if (!list_empty(&s->children)) { + s = list_first_entry(&s->children, + struct serio, child_node); + continue; + } + } + + /* + * Either it was a leaf node or reconnect failed and it + * became a leaf node. Continue reconnecting starting with + * the next sibling of the parent node. + */ + while (s != root) { + struct serio *parent = s->parent; + + if (!list_is_last(&s->child_node, &parent->children)) { + s = list_entry(s->child_node.next, + struct serio, child_node); + break; + } + + s = parent; } - serio = serio->child; - } while (serio); + } while (s != root); } /* * serio_disconnect_port() unbinds a port from its driver. As a side effect - * all child ports are unbound and destroyed. + * all children ports are unbound and destroyed. */ static void serio_disconnect_port(struct serio *serio) { - struct serio *s, *parent; + struct serio *s = serio; + + /* + * Children ports should be disconnected and destroyed + * first; we travel the tree in depth-first order. + */ + while (!list_empty(&serio->children)) { + + /* Locate a leaf */ + while (!list_empty(&s->children)) + s = list_first_entry(&s->children, + struct serio, child_node); - if (serio->child) { /* - * Children ports should be disconnected and destroyed - * first, staring with the leaf one, since we don't want - * to do recursion + * Prune this leaf node unless it is the one we + * started with. */ - for (s = serio; s->child; s = s->child) - /* empty */; - - do { - parent = s->parent; + if (s != serio) { + struct serio *parent = s->parent; device_release_driver(&s->dev); serio_destroy_port(s); - } while ((s = parent) != serio); + + s = parent; + } } /* - * Ok, no children left, now disconnect this port + * OK, no children left, now disconnect this port. */ device_release_driver(&serio->dev); } @@ -661,7 +702,7 @@ EXPORT_SYMBOL(serio_rescan); void serio_reconnect(struct serio *serio) { - serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN); + serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE); } EXPORT_SYMBOL(serio_reconnect); @@ -689,14 +730,16 @@ void serio_unregister_port(struct serio *serio) EXPORT_SYMBOL(serio_unregister_port); /* - * Safely unregisters child port if one is present. + * Safely unregisters children ports if they are present. */ void serio_unregister_child_port(struct serio *serio) { + struct serio *s, *next; + mutex_lock(&serio_mutex); - if (serio->child) { - serio_disconnect_port(serio->child); - serio_destroy_port(serio->child); + list_for_each_entry_safe(s, next, &serio->children, child_node) { + serio_disconnect_port(s); + serio_destroy_port(s); } mutex_unlock(&serio_mutex); } @@ -707,19 +750,20 @@ EXPORT_SYMBOL(serio_unregister_child_port); * Serio driver operations */ -static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) +static ssize_t description_show(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 DRIVER_ATTR_RO(description); -static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) +static ssize_t bind_mode_show(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) +static ssize_t bind_mode_store(struct device_driver *drv, const char *buf, size_t count) { struct serio_driver *serio_drv = to_serio_driver(drv); int retval; @@ -735,14 +779,14 @@ static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char return retval; } +static DRIVER_ATTR_RW(bind_mode); - -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 struct attribute *serio_driver_attrs[] = { + &driver_attr_description.attr, + &driver_attr_bind_mode.attr, + NULL, }; +ATTRIBUTE_GROUPS(serio_driver); static int serio_driver_probe(struct device *dev) { @@ -866,8 +910,6 @@ static int serio_bus_match(struct device *dev, struct device_driver *drv) return serio_match_port(serio_drv->id_table, serio); } -#ifdef CONFIG_HOTPLUG - #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ do { \ int err = add_uevent_var(env, fmt, val); \ @@ -888,22 +930,18 @@ static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); + SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); + if (serio->firmware_id[0]) + SERIO_ADD_UEVENT_VAR("SERIO_FIRMWARE_ID=%s", + serio->firmware_id); + return 0; } #undef SERIO_ADD_UEVENT_VAR -#else - -static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) -{ - return -ENODEV; -} - -#endif /* CONFIG_HOTPLUG */ - #ifdef CONFIG_PM static int serio_suspend(struct device *dev) { @@ -981,8 +1019,7 @@ EXPORT_SYMBOL(serio_interrupt); static struct bus_type serio_bus = { .name = "serio", - .dev_attrs = serio_device_attrs, - .drv_attrs = serio_driver_attrs, + .drv_groups = serio_driver_groups, .match = serio_bus_match, .uevent = serio_uevent, .probe = serio_driver_probe, @@ -1003,21 +1040,18 @@ static int __init serio_init(void) return error; } - serio_task = kthread_run(serio_thread, NULL, "kseriod"); - if (IS_ERR(serio_task)) { - bus_unregister(&serio_bus); - error = PTR_ERR(serio_task); - pr_err("Failed to start kseriod, error: %d\n", error); - return error; - } - return 0; } static void __exit serio_exit(void) { bus_unregister(&serio_bus); - kthread_stop(serio_task); + + /* + * There should not be any outstanding events but work may + * still be scheduled so simply cancel it. + */ + cancel_work_sync(&serio_event_work); } subsys_initcall(serio_init); |