/* * class.c - basic device class management * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs * Copyright (c) 2003-2004 Greg Kroah-Hartman * Copyright (c) 2003-2004 IBM Corp. * * This file is released under the GPLv2 * */ #include <linux/config.h>#include <linux/device.h>#include <linux/module.h>#include <linux/init.h>#include <linux/string.h>#include "base.h" #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)#define to_class(obj) container_of(obj, struct class, subsys.kset.kobj) static ssize_tclass_attr_show(struct kobject * kobj, struct attribute * attr, char * buf){ struct class_attribute * class_attr = to_class_attr(attr); struct class * dc = to_class(kobj); ssize_t ret = 0; if (class_attr->show) ret = class_attr->show(dc, buf); return ret;} static ssize_tclass_attr_store(struct kobject * kobj, struct attribute * attr, const char * buf, size_t count){ struct class_attribute * class_attr = to_class_attr(attr); struct class * dc = to_class(kobj); ssize_t ret = 0; if (class_attr->store) ret = class_attr->store(dc, buf, count); return ret;} static void class_release(struct kobject * kobj){ struct class *class = to_class(kobj); pr_debug("class '%s': release.\n", class->name); if (class->class_release) class->class_release(class); else pr_debug("class '%s' does not have a release() function, " "be careful\n", class->name);} static struct sysfs_ops class_sysfs_ops = { .show = class_attr_show, .store = class_attr_store,}; static struct kobj_type ktype_class = { .sysfs_ops = &class_sysfs_ops, .release = class_release,}; /* Hotplug events for classes go to the class_obj subsys */static decl_subsys(class, &ktype_class, NULL); int class_create_file(struct class * cls, const struct class_attribute * attr){ int error; if (cls) { error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr); } else error = -EINVAL; return error;} void class_remove_file(struct class * cls, const struct class_attribute * attr){ if (cls) sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr);} struct class * class_get(struct class * cls){ if (cls) return container_of(subsys_get(&cls->subsys), struct class, subsys); return NULL;} void class_put(struct class * cls){ subsys_put(&cls->subsys);} static int add_class_attrs(struct class * cls){ int i; int error = 0; if (cls->class_attrs) { for (i = 0; attr_name(cls->class_attrs[i]); i++) { error = class_create_file(cls,&cls->class_attrs[i]); if (error) goto Err; } } Done: return error; Err: while (--i >= 0) class_remove_file(cls,&cls->class_attrs[i]); goto Done;} static void remove_class_attrs(struct class * cls){ int i; if (cls->class_attrs) { for (i = 0; attr_name(cls->class_attrs[i]); i++) class_remove_file(cls,&cls->class_attrs[i]); }} int class_register(struct class * cls){ int error; pr_debug("device class '%s': registering\n", cls->name); INIT_LIST_HEAD(&cls->children); INIT_LIST_HEAD(&cls->interfaces); error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name); if (error) return error; subsys_set_kset(cls, class_subsys); error = subsystem_register(&cls->subsys); if (!error) { error = add_class_attrs(class_get(cls)); class_put(cls); } return error;} void class_unregister(struct class * cls){ pr_debug("device class '%s': unregistering\n", cls->name); remove_class_attrs(cls); subsystem_unregister(&cls->subsys);} /* Class Device Stuff */ int class_device_create_file(struct class_device * class_dev, const struct class_device_attribute * attr){ int error = -EINVAL; if (class_dev) error = sysfs_create_file(&class_dev->kobj, &attr->attr); return error;} void class_device_remove_file(struct class_device * class_dev, const struct class_device_attribute * attr){ if (class_dev) sysfs_remove_file(&class_dev->kobj, &attr->attr);} int class_device_create_bin_file(struct class_device *class_dev, struct bin_attribute *attr){ int error = -EINVAL; if (class_dev) error = sysfs_create_bin_file(&class_dev->kobj, attr); return error;} void class_device_remove_bin_file(struct class_device *class_dev, struct bin_attribute *attr){ if (class_dev) sysfs_remove_bin_file(&class_dev->kobj, attr);} static int class_device_dev_link(struct class_device * class_dev){ if (class_dev->dev) return sysfs_create_link(&class_dev->kobj, &class_dev->dev->kobj, "device"); return 0;} static void class_device_dev_unlink(struct class_device * class_dev){ sysfs_remove_link(&class_dev->kobj, "device");} static int class_device_driver_link(struct class_device * class_dev){ if ((class_dev->dev) && (class_dev->dev->driver)) return sysfs_create_link(&class_dev->kobj, &class_dev->dev->driver->kobj, "driver"); return 0;} static void class_device_driver_unlink(struct class_device * class_dev){ sysfs_remove_link(&class_dev->kobj, "driver");} static ssize_tclass_device_attr_show(struct kobject * kobj, struct attribute * attr, char * buf){ struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); struct class_device * cd = to_class_dev(kobj); ssize_t ret = 0; if (class_dev_attr->show) ret = class_dev_attr->show(cd, buf); return ret;} static ssize_tclass_device_attr_store(struct kobject * kobj, struct attribute * attr, const char * buf, size_t count){ struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); struct class_device * cd = to_class_dev(kobj); ssize_t ret = 0; if (class_dev_attr->store) ret = class_dev_attr->store(cd, buf, count); return ret;} static struct sysfs_ops class_dev_sysfs_ops = { .show = class_device_attr_show, .store = class_device_attr_store,}; static void class_dev_release(struct kobject * kobj){ struct class_device *cd = to_class_dev(kobj); struct class * cls = cd->class; pr_debug("device class '%s': release.\n", cd->class_id); if (cls->release) cls->release(cd); else { printk(KERN_ERR "Device class '%s' does not have a release() function, " "it is broken and must be fixed.\n", cd->class_id); WARN_ON(1); }} static struct kobj_type ktype_class_device = { .sysfs_ops = &class_dev_sysfs_ops, .release = class_dev_release,}; static int class_hotplug_filter(struct kset *kset, struct kobject *kobj){ struct kobj_type *ktype = get_ktype(kobj); if (ktype == &ktype_class_device) { struct class_device *class_dev = to_class_dev(kobj); if (class_dev->class) return 1; } return 0;} static char *class_hotplug_name(struct kset *kset, struct kobject *kobj){ struct class_device *class_dev = to_class_dev(kobj); return class_dev->class->name;} static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp, int num_envp, char *buffer, int buffer_size){ struct class_device *class_dev = to_class_dev(kobj); int retval = 0; int i = 0; int length = 0; pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); if (class_dev->dev) { /* add physical device, backing this device */ struct device *dev = class_dev->dev; char *path = kobject_get_path(&dev->kobj, GFP_KERNEL); add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVPATH=%s", path); kfree(path); /* add bus name of physical device */ if (dev->bus) add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVBUS=%s", dev->bus->name); /* add driver name of physical device */ if (dev->driver) add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVDRIVER=%s", dev->driver->name); /* terminate, set to next free slot, shrink available space */ envp[i] = NULL; envp = &envp[i]; num_envp -= i; buffer = &buffer[length]; buffer_size -= length; } if (class_dev->class->hotplug) { /* have the bus specific function add its stuff */ retval = class_dev->class->hotplug (class_dev, envp, num_envp, buffer, buffer_size); if (retval) { pr_debug ("%s - hotplug() returned %d\n", __FUNCTION__, retval); } } return retval;} static struct kset_hotplug_ops class_hotplug_ops = { .filter = class_hotplug_filter, .name = class_hotplug_name, .hotplug = class_hotplug,}; static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops); static int class_device_add_attrs(struct class_device * cd){ int i; int error = 0; struct class * cls = cd->class; if (cls->class_dev_attrs) { for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { error = class_device_create_file(cd, &cls->class_dev_attrs[i]); if (error) goto Err; } } Done: return error; Err: while (--i >= 0) class_device_remove_file(cd,&cls->class_dev_attrs[i]); goto Done;} static void class_device_remove_attrs(struct class_device * cd){ int i; struct class * cls = cd->class; if (cls->class_dev_attrs) { for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) class_device_remove_file(cd,&cls->class_dev_attrs[i]); }} void class_device_initialize(struct class_device *class_dev){ kobj_set_kset_s(class_dev, class_obj_subsys); kobject_init(&class_dev->kobj); INIT_LIST_HEAD(&class_dev->node);} int class_device_add(struct class_device *class_dev){ struct class * parent = NULL; struct class_interface * class_intf; int error; class_dev = class_device_get(class_dev); if (!class_dev) return -EINVAL; if (!strlen(class_dev->class_id)) { error = -EINVAL; goto register_done; } parent = class_get(class_dev->class); pr_debug("CLASS: registering class device: ID = '%s'\n", class_dev->class_id); /* first, register with generic layer. */ kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); if (parent) class_dev->kobj.parent = &parent->subsys.kset.kobj; if ((error = kobject_add(&class_dev->kobj))) goto register_done; /* now take care of our own registration */ if (parent) { down_write(&parent->subsys.rwsem); list_add_tail(&class_dev->node, &parent->children); list_for_each_entry(class_intf, &parent->interfaces, node) if (class_intf->add) class_intf->add(class_dev); up_write(&parent->subsys.rwsem); } class_device_add_attrs(class_dev); class_device_dev_link(class_dev); class_device_driver_link(class_dev); register_done: if (error && parent) class_put(parent); class_device_put(class_dev); return error;} int class_device_register(struct class_device *class_dev){ class_device_initialize(class_dev); return class_device_add(class_dev);} void class_device_del(struct class_device *class_dev){ struct class * parent = class_dev->class; struct class_interface * class_intf; if (parent) { down_write(&parent->subsys.rwsem); list_del_init(&class_dev->node); list_for_each_entry(class_intf, &parent->interfaces, node) if (class_intf->remove) class_intf->remove(class_dev); up_write(&parent->subsys.rwsem); } class_device_dev_unlink(class_dev); class_device_driver_unlink(class_dev); class_device_remove_attrs(class_dev); kobject_del(&class_dev->kobj); if (parent) class_put(parent);} void class_device_unregister(struct class_device *class_dev){ pr_debug("CLASS: Unregistering class device. ID = '%s'\n", class_dev->class_id); class_device_del(class_dev); class_device_put(class_dev);} int class_device_rename(struct class_device *class_dev, char *new_name){ int error = 0; class_dev = class_device_get(class_dev); if (!class_dev) return -EINVAL; pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id, new_name); strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN); error = kobject_rename(&class_dev->kobj, new_name); class_device_put(class_dev); Lines 1–500 of 599. Load more
/* * class.c - basic device class management * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs * Copyright (c) 2003-2004 Greg Kroah-Hartman * Copyright (c) 2003-2004 IBM Corp. * * This file is released under the GPLv2 * */ #include <linux/config.h> #include <linux/device.h> #include <linux/module.h> #include <linux/init.h> #include <linux/string.h> #include "base.h" #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj) static ssize_t class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) { struct class_attribute * class_attr = to_class_attr(attr); struct class * dc = to_class(kobj); ssize_t ret = 0; if (class_attr->show) ret = class_attr->show(dc, buf); return ret; } static ssize_t class_attr_store(struct kobject * kobj, struct attribute * attr, const char * buf, size_t count) { struct class_attribute * class_attr = to_class_attr(attr); struct class * dc = to_class(kobj); ssize_t ret = 0; if (class_attr->store) ret = class_attr->store(dc, buf, count); return ret; } static void class_release(struct kobject * kobj) { struct class *class = to_class(kobj); pr_debug("class '%s': release.\n", class->name); if (class->class_release) class->class_release(class); else pr_debug("class '%s' does not have a release() function, " "be careful\n", class->name); } static struct sysfs_ops class_sysfs_ops = { .show = class_attr_show, .store = class_attr_store, }; static struct kobj_type ktype_class = { .sysfs_ops = &class_sysfs_ops, .release = class_release, }; /* Hotplug events for classes go to the class_obj subsys */ static decl_subsys(class, &ktype_class, NULL); int class_create_file(struct class * cls, const struct class_attribute * attr) { int error; if (cls) { error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr); } else error = -EINVAL; return error; } void class_remove_file(struct class * cls, const struct class_attribute * attr) { if (cls) sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr); } struct class * class_get(struct class * cls) { if (cls) return container_of(subsys_get(&cls->subsys), struct class, subsys); return NULL; } void class_put(struct class * cls) { subsys_put(&cls->subsys); } static int add_class_attrs(struct class * cls) { int i; int error = 0; if (cls->class_attrs) { for (i = 0; attr_name(cls->class_attrs[i]); i++) { error = class_create_file(cls,&cls->class_attrs[i]); if (error) goto Err; } } Done: return error; Err: while (--i >= 0) class_remove_file(cls,&cls->class_attrs[i]); goto Done; } static void remove_class_attrs(struct class * cls) { int i; if (cls->class_attrs) { for (i = 0; attr_name(cls->class_attrs[i]); i++) class_remove_file(cls,&cls->class_attrs[i]); } } int class_register(struct class * cls) { int error; pr_debug("device class '%s': registering\n", cls->name); INIT_LIST_HEAD(&cls->children); INIT_LIST_HEAD(&cls->interfaces); error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name); if (error) return error; subsys_set_kset(cls, class_subsys); error = subsystem_register(&cls->subsys); if (!error) { error = add_class_attrs(class_get(cls)); class_put(cls); } return error; } void class_unregister(struct class * cls) { pr_debug("device class '%s': unregistering\n", cls->name); remove_class_attrs(cls); subsystem_unregister(&cls->subsys); } /* Class Device Stuff */ int class_device_create_file(struct class_device * class_dev, const struct class_device_attribute * attr) { int error = -EINVAL; if (class_dev) error = sysfs_create_file(&class_dev->kobj, &attr->attr); return error; } void class_device_remove_file(struct class_device * class_dev, const struct class_device_attribute * attr) { if (class_dev) sysfs_remove_file(&class_dev->kobj, &attr->attr); } int class_device_create_bin_file(struct class_device *class_dev, struct bin_attribute *attr) { int error = -EINVAL; if (class_dev) error = sysfs_create_bin_file(&class_dev->kobj, attr); return error; } void class_device_remove_bin_file(struct class_device *class_dev, struct bin_attribute *attr) { if (class_dev) sysfs_remove_bin_file(&class_dev->kobj, attr); } static int class_device_dev_link(struct class_device * class_dev) { if (class_dev->dev) return sysfs_create_link(&class_dev->kobj, &class_dev->dev->kobj, "device"); return 0; } static void class_device_dev_unlink(struct class_device * class_dev) { sysfs_remove_link(&class_dev->kobj, "device"); } static int class_device_driver_link(struct class_device * class_dev) { if ((class_dev->dev) && (class_dev->dev->driver)) return sysfs_create_link(&class_dev->kobj, &class_dev->dev->driver->kobj, "driver"); return 0; } static void class_device_driver_unlink(struct class_device * class_dev) { sysfs_remove_link(&class_dev->kobj, "driver"); } static ssize_t class_device_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) { struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); struct class_device * cd = to_class_dev(kobj); ssize_t ret = 0; if (class_dev_attr->show) ret = class_dev_attr->show(cd, buf); return ret; } static ssize_t class_device_attr_store(struct kobject * kobj, struct attribute * attr, const char * buf, size_t count) { struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); struct class_device * cd = to_class_dev(kobj); ssize_t ret = 0; if (class_dev_attr->store) ret = class_dev_attr->store(cd, buf, count); return ret; } static struct sysfs_ops class_dev_sysfs_ops = { .show = class_device_attr_show, .store = class_device_attr_store, }; static void class_dev_release(struct kobject * kobj) { struct class_device *cd = to_class_dev(kobj); struct class * cls = cd->class; pr_debug("device class '%s': release.\n", cd->class_id); if (cls->release) cls->release(cd); else { printk(KERN_ERR "Device class '%s' does not have a release() function, " "it is broken and must be fixed.\n", cd->class_id); WARN_ON(1); } } static struct kobj_type ktype_class_device = { .sysfs_ops = &class_dev_sysfs_ops, .release = class_dev_release, }; static int class_hotplug_filter(struct kset *kset, struct kobject *kobj) { struct kobj_type *ktype = get_ktype(kobj); if (ktype == &ktype_class_device) { struct class_device *class_dev = to_class_dev(kobj); if (class_dev->class) return 1; } return 0; } static char *class_hotplug_name(struct kset *kset, struct kobject *kobj) { struct class_device *class_dev = to_class_dev(kobj); return class_dev->class->name; } static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp, int num_envp, char *buffer, int buffer_size) { struct class_device *class_dev = to_class_dev(kobj); int retval = 0; int i = 0; int length = 0; pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); if (class_dev->dev) { /* add physical device, backing this device */ struct device *dev = class_dev->dev; char *path = kobject_get_path(&dev->kobj, GFP_KERNEL); add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVPATH=%s", path); kfree(path); /* add bus name of physical device */ if (dev->bus) add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVBUS=%s", dev->bus->name); /* add driver name of physical device */ if (dev->driver) add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVDRIVER=%s", dev->driver->name); /* terminate, set to next free slot, shrink available space */ envp[i] = NULL; envp = &envp[i]; num_envp -= i; buffer = &buffer[length]; buffer_size -= length; } if (class_dev->class->hotplug) { /* have the bus specific function add its stuff */ retval = class_dev->class->hotplug (class_dev, envp, num_envp, buffer, buffer_size); if (retval) { pr_debug ("%s - hotplug() returned %d\n", __FUNCTION__, retval); } } return retval; } static struct kset_hotplug_ops class_hotplug_ops = { .filter = class_hotplug_filter, .name = class_hotplug_name, .hotplug = class_hotplug, }; static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops); static int class_device_add_attrs(struct class_device * cd) { int i; int error = 0; struct class * cls = cd->class; if (cls->class_dev_attrs) { for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { error = class_device_create_file(cd, &cls->class_dev_attrs[i]); if (error) goto Err; } } Done: return error; Err: while (--i >= 0) class_device_remove_file(cd,&cls->class_dev_attrs[i]); goto Done; } static void class_device_remove_attrs(struct class_device * cd) { int i; struct class * cls = cd->class; if (cls->class_dev_attrs) { for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) class_device_remove_file(cd,&cls->class_dev_attrs[i]); } } void class_device_initialize(struct class_device *class_dev) { kobj_set_kset_s(class_dev, class_obj_subsys); kobject_init(&class_dev->kobj); INIT_LIST_HEAD(&class_dev->node); } int class_device_add(struct class_device *class_dev) { struct class * parent = NULL; struct class_interface * class_intf; int error; class_dev = class_device_get(class_dev); if (!class_dev) return -EINVAL; if (!strlen(class_dev->class_id)) { error = -EINVAL; goto register_done; } parent = class_get(class_dev->class); pr_debug("CLASS: registering class device: ID = '%s'\n", class_dev->class_id); /* first, register with generic layer. */ kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); if (parent) class_dev->kobj.parent = &parent->subsys.kset.kobj; if ((error = kobject_add(&class_dev->kobj))) goto register_done; /* now take care of our own registration */ if (parent) { down_write(&parent->subsys.rwsem); list_add_tail(&class_dev->node, &parent->children); list_for_each_entry(class_intf, &parent->interfaces, node) if (class_intf->add) class_intf->add(class_dev); up_write(&parent->subsys.rwsem); } class_device_add_attrs(class_dev); class_device_dev_link(class_dev); class_device_driver_link(class_dev); register_done: if (error && parent) class_put(parent); class_device_put(class_dev); return error; } int class_device_register(struct class_device *class_dev) { class_device_initialize(class_dev); return class_device_add(class_dev); } void class_device_del(struct class_device *class_dev) { struct class * parent = class_dev->class; struct class_interface * class_intf; if (parent) { down_write(&parent->subsys.rwsem); list_del_init(&class_dev->node); list_for_each_entry(class_intf, &parent->interfaces, node) if (class_intf->remove) class_intf->remove(class_dev); up_write(&parent->subsys.rwsem); } class_device_dev_unlink(class_dev); class_device_driver_unlink(class_dev); class_device_remove_attrs(class_dev); kobject_del(&class_dev->kobj); if (parent) class_put(parent); } void class_device_unregister(struct class_device *class_dev) { pr_debug("CLASS: Unregistering class device. ID = '%s'\n", class_dev->class_id); class_device_del(class_dev); class_device_put(class_dev); } int class_device_rename(struct class_device *class_dev, char *new_name) { int error = 0; class_dev = class_device_get(class_dev); if (!class_dev) return -EINVAL; pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id, new_name); strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN); error = kobject_rename(&class_dev->kobj, new_name); class_device_put(class_dev);