X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fbase%2Fcore.c;h=7ecb1938e590f34526beaaeda2a3f6683f4024ce;hb=651b1f125c7e3806bbd635739d009433dc07372d;hp=1e2e0fa8a450086f924d79d28ecd07649deaf6ab;hpb=7a8d37a37380e2b1500592d40b7ec384dbebe7a0;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/base/core.c b/drivers/base/core.c index 1e2e0fa..7ecb193 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -19,13 +19,19 @@ #include #include #include -#include +#include +#include +#include +#include #include "base.h" #include "power/power.h" int (*platform_notify)(struct device *dev) = NULL; int (*platform_notify_remove)(struct device *dev) = NULL; +static struct kobject *dev_kobj; +struct kobject *sysfs_dev_char_kobj; +struct kobject *sysfs_dev_block_kobj; #ifdef CONFIG_BLOCK static inline int device_is_not_partition(struct device *dev) @@ -48,7 +54,7 @@ static inline int device_is_not_partition(struct device *dev) * it is attached to. If it is not attached to a bus either, an empty * string will be returned. */ -const char *dev_driver_string(struct device *dev) +const char *dev_driver_string(const struct device *dev) { return dev->driver ? dev->driver->name : (dev->bus ? dev->bus->name : @@ -68,6 +74,10 @@ static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, if (dev_attr->show) ret = dev_attr->show(dev, dev_attr, buf); + if (ret >= (ssize_t)PAGE_SIZE) { + print_symbol("dev_attr_show: %s returned bad count\n", + (unsigned long)dev_attr->show); + } return ret; } @@ -100,6 +110,7 @@ static struct sysfs_ops dev_sysfs_ops = { static void device_release(struct kobject *kobj) { struct device *dev = to_dev(kobj); + struct device_private *p = dev->p; if (dev->release) dev->release(dev); @@ -107,12 +118,11 @@ static void device_release(struct kobject *kobj) dev->type->release(dev); else if (dev->class && dev->class->dev_release) dev->class->dev_release(dev); - else { - printk(KERN_ERR "Device '%s' does not have a release() " + else + WARN(1, KERN_ERR "Device '%s' does not have a release() " "function, it is broken and must be fixed.\n", - dev->bus_id); - WARN_ON(1); - } + dev_name(dev)); + kfree(p); } static struct kobj_type device_ktype = { @@ -127,8 +137,6 @@ static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) if (ktype == &device_ktype) { struct device *dev = to_dev(kobj); - if (dev->uevent_suppress) - return 0; if (dev->bus) return 1; if (dev->class) @@ -154,10 +162,18 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, struct device *dev = to_dev(kobj); int retval = 0; - /* add the major/minor if present */ + /* add device node properties if present */ if (MAJOR(dev->devt)) { + const char *tmp; + const char *name; + add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); + name = device_get_nodename(dev, &tmp); + if (name) { + add_uevent_var(env, "DEVNAME=%s", name); + kfree(tmp); + } } if (dev->type && dev->type->name) @@ -202,7 +218,7 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, retval = dev->bus->uevent(dev, env); if (retval) pr_debug("device: '%s': %s: bus uevent() returned %d\n", - dev->bus_id, __FUNCTION__, retval); + dev_name(dev), __func__, retval); } /* have the class specific function add its stuff */ @@ -210,8 +226,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, retval = dev->class->dev_uevent(dev, env); if (retval) pr_debug("device: '%s': %s: class uevent() " - "returned %d\n", dev->bus_id, - __FUNCTION__, retval); + "returned %d\n", dev_name(dev), + __func__, retval); } /* have the device type specific fuction add its stuff */ @@ -219,8 +235,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, retval = dev->type->uevent(dev, env); if (retval) pr_debug("device: '%s': %s: dev_type uevent() " - "returned %d\n", dev->bus_id, - __FUNCTION__, retval); + "returned %d\n", dev_name(dev), + __func__, retval); } return retval; @@ -500,14 +516,16 @@ EXPORT_SYMBOL_GPL(device_schedule_callback_owner); static void klist_children_get(struct klist_node *n) { - struct device *dev = container_of(n, struct device, knode_parent); + struct device_private *p = to_device_private_parent(n); + struct device *dev = p->device; get_device(dev); } static void klist_children_put(struct klist_node *n) { - struct device *dev = container_of(n, struct device, knode_parent); + struct device_private *p = to_device_private_parent(n); + struct device *dev = p->device; put_device(dev); } @@ -516,24 +534,27 @@ static void klist_children_put(struct klist_node *n) * device_initialize - init device structure. * @dev: device. * - * This prepares the device for use by other layers, - * including adding it to the device hierarchy. + * This prepares the device for use by other layers by initializing + * its fields. * It is the first half of device_register(), if called by - * that, though it can also be called separately, so one - * may use @dev's fields (e.g. the refcount). + * that function, though it can also be called separately, so one + * may use @dev's fields. In particular, get_device()/put_device() + * may be used for reference counting of @dev after calling this + * function. + * + * NOTE: Use put_device() to give up your reference instead of freeing + * @dev directly once you have called this function. */ void device_initialize(struct device *dev) { dev->kobj.kset = devices_kset; kobject_init(&dev->kobj, &device_ktype); - klist_init(&dev->klist_children, klist_children_get, - klist_children_put); INIT_LIST_HEAD(&dev->dma_pools); - INIT_LIST_HEAD(&dev->node); init_MUTEX(&dev->sem); spin_lock_init(&dev->devres_lock); INIT_LIST_HEAD(&dev->devres_head); device_init_wakeup(dev, 0); + device_pm_init(dev); set_dev_node(dev, -1); } @@ -543,7 +564,7 @@ static struct kobject *get_device_parent(struct device *dev, { /* class devices without a parent live in /sys/class// */ if (dev->class && (!parent || parent->class != dev->class)) - return &dev->class->subsys.kobj; + return &dev->class->p->class_subsys.kobj; /* all other devices keep their parent */ else if (parent) return &parent->kobj; @@ -589,13 +610,13 @@ static struct kobject *get_device_parent(struct device *dev, parent_kobj = &parent->kobj; /* find our class-directory at the parent and reference it */ - spin_lock(&dev->class->class_dirs.list_lock); - list_for_each_entry(k, &dev->class->class_dirs.list, entry) + spin_lock(&dev->class->p->class_dirs.list_lock); + list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) if (k->parent == parent_kobj) { kobj = kobject_get(k); break; } - spin_unlock(&dev->class->class_dirs.list_lock); + spin_unlock(&dev->class->p->class_dirs.list_lock); if (kobj) return kobj; @@ -603,7 +624,7 @@ static struct kobject *get_device_parent(struct device *dev, k = kobject_create(); if (!k) return NULL; - k->kset = &dev->class->class_dirs; + k->kset = &dev->class->p->class_dirs; retval = kobject_add(k, parent_kobj, "%s", dev->class->name); if (retval < 0) { kobject_put(k); @@ -621,7 +642,8 @@ static struct kobject *get_device_parent(struct device *dev, static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) { /* see if we live in a "glue" directory */ - if (!dev->class || glue_dir->kset != &dev->class->class_dirs) + if (!glue_dir || !dev->class || + glue_dir->kset != &dev->class->p->class_dirs) return; kobject_put(glue_dir); @@ -648,17 +670,18 @@ static int device_add_class_symlinks(struct device *dev) if (!dev->class) return 0; - error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, + error = sysfs_create_link(&dev->kobj, + &dev->class->p->class_subsys.kobj, "subsystem"); if (error) goto out; #ifdef CONFIG_SYSFS_DEPRECATED /* stacked class devices need a symlink in the class directory */ - if (dev->kobj.parent != &dev->class->subsys.kobj && + if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && device_is_not_partition(dev)) { - error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, - dev->bus_id); + error = sysfs_create_link(&dev->class->p->class_subsys.kobj, + &dev->kobj, dev_name(dev)); if (error) goto out_subsys; } @@ -695,13 +718,14 @@ out_device: if (dev->parent && device_is_not_partition(dev)) sysfs_remove_link(&dev->kobj, "device"); out_busid: - if (dev->kobj.parent != &dev->class->subsys.kobj && + if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && device_is_not_partition(dev)) - sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); + sysfs_remove_link(&dev->class->p->class_subsys.kobj, + dev_name(dev)); #else /* link in the class directory pointing to the device */ - error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, - dev->bus_id); + error = sysfs_create_link(&dev->class->p->class_subsys.kobj, + &dev->kobj, dev_name(dev)); if (error) goto out_subsys; @@ -714,7 +738,7 @@ out_busid: return 0; out_busid: - sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); + sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); #endif out_subsys: @@ -740,49 +764,144 @@ static void device_remove_class_symlinks(struct device *dev) sysfs_remove_link(&dev->kobj, "device"); } - if (dev->kobj.parent != &dev->class->subsys.kobj && + if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && device_is_not_partition(dev)) - sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); + sysfs_remove_link(&dev->class->p->class_subsys.kobj, + dev_name(dev)); #else if (dev->parent && device_is_not_partition(dev)) sysfs_remove_link(&dev->kobj, "device"); - sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); + sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); #endif sysfs_remove_link(&dev->kobj, "subsystem"); } /** + * dev_set_name - set a device name + * @dev: device + * @fmt: format string for the device's name + */ +int dev_set_name(struct device *dev, const char *fmt, ...) +{ + va_list vargs; + int err; + + va_start(vargs, fmt); + err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); + va_end(vargs); + return err; +} +EXPORT_SYMBOL_GPL(dev_set_name); + +/** + * device_to_dev_kobj - select a /sys/dev/ directory for the device + * @dev: device + * + * By default we select char/ for new entries. Setting class->dev_obj + * to NULL prevents an entry from being created. class->dev_kobj must + * be set (or cleared) before any devices are registered to the class + * otherwise device_create_sys_dev_entry() and + * device_remove_sys_dev_entry() will disagree about the the presence + * of the link. + */ +static struct kobject *device_to_dev_kobj(struct device *dev) +{ + struct kobject *kobj; + + if (dev->class) + kobj = dev->class->dev_kobj; + else + kobj = sysfs_dev_char_kobj; + + return kobj; +} + +static int device_create_sys_dev_entry(struct device *dev) +{ + struct kobject *kobj = device_to_dev_kobj(dev); + int error = 0; + char devt_str[15]; + + if (kobj) { + format_dev_t(devt_str, dev->devt); + error = sysfs_create_link(kobj, &dev->kobj, devt_str); + } + + return error; +} + +static void device_remove_sys_dev_entry(struct device *dev) +{ + struct kobject *kobj = device_to_dev_kobj(dev); + char devt_str[15]; + + if (kobj) { + format_dev_t(devt_str, dev->devt); + sysfs_remove_link(kobj, devt_str); + } +} + +/** * device_add - add device to device hierarchy. * @dev: device. * * This is part 2 of device_register(), though may be called * separately _iff_ device_initialize() has been called separately. * - * This adds it to the kobject hierarchy via kobject_add(), adds it + * This adds @dev to the kobject hierarchy via kobject_add(), adds it * to the global and sibling lists for the device, then * adds it to the other relevant subsystems of the driver model. + * + * NOTE: _Never_ directly free @dev after calling this function, even + * if it returned an error! Always use put_device() to give up your + * reference instead. */ int device_add(struct device *dev) { struct device *parent = NULL; struct class_interface *class_intf; - int error; + int error = -EINVAL; dev = get_device(dev); - if (!dev || !strlen(dev->bus_id)) { - error = -EINVAL; - goto Error; + if (!dev) + goto done; + + dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); + if (!dev->p) { + error = -ENOMEM; + goto done; } + dev->p->device = dev; + klist_init(&dev->p->klist_children, klist_children_get, + klist_children_put); - pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); + /* + * for statically allocated devices, which should all be converted + * some day, we need to initialize the name. We prevent reading back + * the name, and force the use of dev_name() + */ + if (dev->init_name) { + dev_set_name(dev, "%s", dev->init_name); + dev->init_name = NULL; + } + + if (!dev_name(dev)) + goto name_error; + + pr_debug("device: '%s': %s\n", dev_name(dev), __func__); parent = get_device(dev->parent); setup_parent(dev, parent); + /* use parent numa_node */ + if (parent) + set_dev_node(dev, dev_to_node(parent)); + /* first, register with generic layer. */ - error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); + /* we require the name to be set before, and pass NULL */ + error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); if (error) goto Error; @@ -790,11 +909,6 @@ int device_add(struct device *dev) if (platform_notify) platform_notify(dev); - /* notify clients of device entry (new way) */ - if (dev->bus) - blocking_notifier_call_chain(&dev->bus->p->bus_notifier, - BUS_NOTIFY_ADD_DEVICE, dev); - error = device_create_file(dev, &uevent_attr); if (error) goto attrError; @@ -803,6 +917,10 @@ int device_add(struct device *dev) error = device_create_file(dev, &devt_attr); if (error) goto ueventattrError; + + error = device_create_sys_dev_entry(dev); + if (error) + goto devtattrError; } error = device_add_class_symlinks(dev); @@ -811,44 +929,54 @@ int device_add(struct device *dev) error = device_add_attrs(dev); if (error) goto AttrsError; - error = dpm_sysfs_add(dev); - if (error) - goto PMError; - device_pm_add(dev); error = bus_add_device(dev); if (error) goto BusError; + error = dpm_sysfs_add(dev); + if (error) + goto DPMError; + device_pm_add(dev); + + /* Notify clients of device addition. This call must come + * after dpm_sysf_add() and before kobject_uevent(). + */ + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, + BUS_NOTIFY_ADD_DEVICE, dev); + kobject_uevent(&dev->kobj, KOBJ_ADD); bus_attach_device(dev); if (parent) - klist_add_tail(&dev->knode_parent, &parent->klist_children); + klist_add_tail(&dev->p->knode_parent, + &parent->p->klist_children); if (dev->class) { - down(&dev->class->sem); + mutex_lock(&dev->class->p->class_mutex); /* tie the class to the device */ - list_add_tail(&dev->node, &dev->class->devices); + klist_add_tail(&dev->knode_class, + &dev->class->p->class_devices); /* notify any interfaces that the device is here */ - list_for_each_entry(class_intf, &dev->class->interfaces, node) + list_for_each_entry(class_intf, + &dev->class->p->class_interfaces, node) if (class_intf->add_dev) class_intf->add_dev(dev, class_intf); - up(&dev->class->sem); + mutex_unlock(&dev->class->p->class_mutex); } - Done: +done: put_device(dev); return error; + DPMError: + bus_remove_device(dev); BusError: - device_pm_remove(dev); - dpm_sysfs_remove(dev); - PMError: - if (dev->bus) - blocking_notifier_call_chain(&dev->bus->p->bus_notifier, - BUS_NOTIFY_DEL_DEVICE, dev); device_remove_attrs(dev); AttrsError: device_remove_class_symlinks(dev); SymlinkError: if (MAJOR(dev->devt)) + device_remove_sys_dev_entry(dev); + devtattrError: + if (MAJOR(dev->devt)) device_remove_file(dev, &devt_attr); ueventattrError: device_remove_file(dev, &uevent_attr); @@ -859,7 +987,10 @@ int device_add(struct device *dev) cleanup_device_parent(dev); if (parent) put_device(parent); - goto Done; +name_error: + kfree(dev->p); + dev->p = NULL; + goto done; } /** @@ -872,6 +1003,10 @@ int device_add(struct device *dev) * I.e. you should only call the two helpers separately if * have a clearly defined need to use and refcount the device * before it is added to the hierarchy. + * + * NOTE: _Never_ directly free @dev after calling this function, even + * if it returned an error! Always use put_device() to give up the + * reference initialized in this function instead. */ int device_register(struct device *dev) { @@ -921,22 +1056,32 @@ void device_del(struct device *dev) struct device *parent = dev->parent; struct class_interface *class_intf; + /* Notify clients of device removal. This call must come + * before dpm_sysfs_remove(). + */ + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, + BUS_NOTIFY_DEL_DEVICE, dev); device_pm_remove(dev); + dpm_sysfs_remove(dev); if (parent) - klist_del(&dev->knode_parent); - if (MAJOR(dev->devt)) + klist_del(&dev->p->knode_parent); + if (MAJOR(dev->devt)) { + device_remove_sys_dev_entry(dev); device_remove_file(dev, &devt_attr); + } if (dev->class) { device_remove_class_symlinks(dev); - down(&dev->class->sem); + mutex_lock(&dev->class->p->class_mutex); /* notify any interfaces that the device is now gone */ - list_for_each_entry(class_intf, &dev->class->interfaces, node) + list_for_each_entry(class_intf, + &dev->class->p->class_interfaces, node) if (class_intf->remove_dev) class_intf->remove_dev(dev, class_intf); /* remove the device from the class list */ - list_del_init(&dev->node); - up(&dev->class->sem); + klist_del(&dev->knode_class); + mutex_unlock(&dev->class->p->class_mutex); } device_remove_file(dev, &uevent_attr); device_remove_attrs(dev); @@ -954,9 +1099,6 @@ void device_del(struct device *dev) */ if (platform_notify_remove) platform_notify_remove(dev); - if (dev->bus) - blocking_notifier_call_chain(&dev->bus->p->bus_notifier, - BUS_NOTIFY_DEL_DEVICE, dev); kobject_uevent(&dev->kobj, KOBJ_REMOVE); cleanup_device_parent(dev); kobject_del(&dev->kobj); @@ -976,7 +1118,7 @@ void device_del(struct device *dev) */ void device_unregister(struct device *dev) { - pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); + pr_debug("device: '%s': %s\n", dev_name(dev), __func__); device_del(dev); put_device(dev); } @@ -984,7 +1126,55 @@ void device_unregister(struct device *dev) static struct device *next_device(struct klist_iter *i) { struct klist_node *n = klist_next(i); - return n ? container_of(n, struct device, knode_parent) : NULL; + struct device *dev = NULL; + struct device_private *p; + + if (n) { + p = to_device_private_parent(n); + dev = p->device; + } + return dev; +} + +/** + * device_get_nodename - path of device node file + * @dev: device + * @tmp: possibly allocated string + * + * Return the relative path of a possible device node. + * Non-default names may need to allocate a memory to compose + * a name. This memory is returned in tmp and needs to be + * freed by the caller. + */ +const char *device_get_nodename(struct device *dev, const char **tmp) +{ + char *s; + + *tmp = NULL; + + /* the device type may provide a specific name */ + if (dev->type && dev->type->nodename) + *tmp = dev->type->nodename(dev); + if (*tmp) + return *tmp; + + /* the class may provide a specific name */ + if (dev->class && dev->class->nodename) + *tmp = dev->class->nodename(dev); + if (*tmp) + return *tmp; + + /* return name without allocation, tmp == NULL */ + if (strchr(dev_name(dev), '!') == NULL) + return dev_name(dev); + + /* replace '!' in the name with '/' */ + *tmp = kstrdup(dev_name(dev), GFP_KERNEL); + if (!*tmp) + return NULL; + while ((s = strchr(*tmp, '!'))) + s[0] = '/'; + return *tmp; } /** @@ -1006,7 +1196,10 @@ int device_for_each_child(struct device *parent, void *data, struct device *child; int error = 0; - klist_iter_init(&parent->klist_children, &i); + if (!parent->p) + return 0; + + klist_iter_init(&parent->p->klist_children, &i); while ((child = next_device(&i)) && !error) error = fn(child, data); klist_iter_exit(&i); @@ -1037,7 +1230,7 @@ struct device *device_find_child(struct device *parent, void *data, if (!parent) return NULL; - klist_iter_init(&parent->klist_children, &i); + klist_iter_init(&parent->p->klist_children, &i); while ((child = next_device(&i))) if (match(child, data) && get_device(child)) break; @@ -1050,7 +1243,25 @@ int __init devices_init(void) devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); if (!devices_kset) return -ENOMEM; + dev_kobj = kobject_create_and_add("dev", NULL); + if (!dev_kobj) + goto dev_kobj_err; + sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); + if (!sysfs_dev_block_kobj) + goto block_kobj_err; + sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); + if (!sysfs_dev_char_kobj) + goto char_kobj_err; + return 0; + + char_kobj_err: + kobject_put(sysfs_dev_block_kobj); + block_kobj_err: + kobject_put(dev_kobj); + dev_kobj_err: + kset_unregister(devices_kset); + return -ENOMEM; } EXPORT_SYMBOL_GPL(device_for_each_child); @@ -1068,19 +1279,112 @@ EXPORT_SYMBOL_GPL(put_device); EXPORT_SYMBOL_GPL(device_create_file); EXPORT_SYMBOL_GPL(device_remove_file); +struct root_device +{ + struct device dev; + struct module *owner; +}; + +#define to_root_device(dev) container_of(dev, struct root_device, dev) + +static void root_device_release(struct device *dev) +{ + kfree(to_root_device(dev)); +} + +/** + * __root_device_register - allocate and register a root device + * @name: root device name + * @owner: owner module of the root device, usually THIS_MODULE + * + * This function allocates a root device and registers it + * using device_register(). In order to free the returned + * device, use root_device_unregister(). + * + * Root devices are dummy devices which allow other devices + * to be grouped under /sys/devices. Use this function to + * allocate a root device and then use it as the parent of + * any device which should appear under /sys/devices/{name} + * + * The /sys/devices/{name} directory will also contain a + * 'module' symlink which points to the @owner directory + * in sysfs. + * + * Note: You probably want to use root_device_register(). + */ +struct device *__root_device_register(const char *name, struct module *owner) +{ + struct root_device *root; + int err = -ENOMEM; + + root = kzalloc(sizeof(struct root_device), GFP_KERNEL); + if (!root) + return ERR_PTR(err); + + err = dev_set_name(&root->dev, "%s", name); + if (err) { + kfree(root); + return ERR_PTR(err); + } + + root->dev.release = root_device_release; + + err = device_register(&root->dev); + if (err) { + put_device(&root->dev); + return ERR_PTR(err); + } + +#ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */ + if (owner) { + struct module_kobject *mk = &owner->mkobj; + + err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); + if (err) { + device_unregister(&root->dev); + return ERR_PTR(err); + } + root->owner = owner; + } +#endif + + return &root->dev; +} +EXPORT_SYMBOL_GPL(__root_device_register); + +/** + * root_device_unregister - unregister and free a root device + * @dev: device going away + * + * This function unregisters and cleans up a device that was created by + * root_device_register(). + */ +void root_device_unregister(struct device *dev) +{ + struct root_device *root = to_root_device(dev); + + if (root->owner) + sysfs_remove_link(&root->dev.kobj, "module"); + + device_unregister(dev); +} +EXPORT_SYMBOL_GPL(root_device_unregister); + static void device_create_release(struct device *dev) { - pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); + pr_debug("device: '%s': %s\n", dev_name(dev), __func__); kfree(dev); } /** - * device_create - creates a device and registers it with sysfs + * device_create_vargs - creates a device and registers it with sysfs * @class: pointer to the struct class that this device should be registered to * @parent: pointer to the parent struct device of this new device, if any * @devt: the dev_t for the char device to be added + * @drvdata: the data to be added to the device for callbacks * @fmt: string for the device's name + * @args: va_list for the device's name * * This function can be used by char device classes. A struct device * will be created in sysfs, registered to the specified class. @@ -1096,10 +1400,10 @@ static void device_create_release(struct device *dev) * Note: the struct class passed to this function must have previously * been created with a call to class_create(). */ -struct device *device_create(struct class *class, struct device *parent, - dev_t devt, const char *fmt, ...) +struct device *device_create_vargs(struct class *class, struct device *parent, + dev_t devt, void *drvdata, const char *fmt, + va_list args) { - va_list args; struct device *dev = NULL; int retval = -ENODEV; @@ -1116,10 +1420,12 @@ struct device *device_create(struct class *class, struct device *parent, dev->class = class; dev->parent = parent; dev->release = device_create_release; + dev_set_drvdata(dev, drvdata); + + retval = kobject_set_name_vargs(&dev->kobj, fmt, args); + if (retval) + goto error; - va_start(args, fmt); - vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); - va_end(args); retval = device_register(dev); if (retval) goto error; @@ -1127,9 +1433,44 @@ struct device *device_create(struct class *class, struct device *parent, return dev; error: - kfree(dev); + put_device(dev); return ERR_PTR(retval); } +EXPORT_SYMBOL_GPL(device_create_vargs); + +/** + * device_create - creates a device and registers it with sysfs + * @class: pointer to the struct class that this device should be registered to + * @parent: pointer to the parent struct device of this new device, if any + * @devt: the dev_t for the char device to be added + * @drvdata: the data to be added to the device for callbacks + * @fmt: string for the device's name + * + * This function can be used by char device classes. A struct device + * will be created in sysfs, registered to the specified class. + * + * A "dev" file will be created, showing the dev_t for the device, if + * the dev_t is not 0,0. + * If a pointer to a parent struct device is passed in, the newly created + * struct device will be a child of that device in sysfs. + * The pointer to the struct device will be returned from the call. + * Any further sysfs files that might be required can be created using this + * pointer. + * + * Note: the struct class passed to this function must have previously + * been created with a call to class_create(). + */ +struct device *device_create(struct class *class, struct device *parent, + dev_t devt, void *drvdata, const char *fmt, ...) +{ + va_list vargs; + struct device *dev; + + va_start(vargs, fmt); + dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); + va_end(vargs); + return dev; +} EXPORT_SYMBOL_GPL(device_create); static int __match_devt(struct device *dev, void *data) @@ -1151,7 +1492,7 @@ void device_destroy(struct class *class, dev_t devt) { struct device *dev; - dev = class_find_device(class, &devt, __match_devt); + dev = class_find_device(class, NULL, &devt, __match_devt); if (dev) { put_device(dev); device_unregister(dev); @@ -1159,39 +1500,15 @@ void device_destroy(struct class *class, dev_t devt) } EXPORT_SYMBOL_GPL(device_destroy); -#ifdef CONFIG_PM_SLEEP -/** - * destroy_suspended_device - asks the PM core to remove a suspended device - * @class: pointer to the struct class that this device was registered with - * @devt: the dev_t of the device that was previously registered - * - * This call notifies the PM core of the necessity to unregister a suspended - * device created with a call to device_create() (devices cannot be - * unregistered directly while suspended, since the PM core holds their - * semaphores at that time). - * - * It can only be called within the scope of a system sleep transition. In - * practice this means it has to be directly or indirectly invoked either by - * a suspend or resume method, or by the PM core (e.g. via - * disable_nonboot_cpus() or enable_nonboot_cpus()). - */ -void destroy_suspended_device(struct class *class, dev_t devt) -{ - struct device *dev; - - dev = class_find_device(class, &devt, __match_devt); - if (dev) { - device_pm_schedule_removal(dev); - put_device(dev); - } -} -EXPORT_SYMBOL_GPL(destroy_suspended_device); -#endif /* CONFIG_PM_SLEEP */ - /** * device_rename - renames a device * @dev: the pointer to the struct device to be renamed * @new_name: the new name of the device + * + * It is the responsibility of the caller to provide mutual + * exclusion between two different calls of device_rename + * on the same device to ensure that new_name is valid and + * won't conflict with other devices. */ int device_rename(struct device *dev, char *new_name) { @@ -1204,34 +1521,31 @@ int device_rename(struct device *dev, char *new_name) if (!dev) return -EINVAL; - pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, - __FUNCTION__, new_name); + pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), + __func__, new_name); #ifdef CONFIG_SYSFS_DEPRECATED if ((dev->class) && (dev->parent)) old_class_name = make_class_name(dev->class->name, &dev->kobj); #endif - old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); + old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); if (!old_device_name) { error = -ENOMEM; goto out; } - strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); - strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); error = kobject_rename(&dev->kobj, new_name); - if (error) { - strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); + if (error) goto out; - } #ifdef CONFIG_SYSFS_DEPRECATED if (old_class_name) { new_class_name = make_class_name(dev->class->name, &dev->kobj); if (new_class_name) { - error = sysfs_create_link(&dev->parent->kobj, - &dev->kobj, new_class_name); + error = sysfs_create_link_nowarn(&dev->parent->kobj, + &dev->kobj, + new_class_name); if (error) goto out; sysfs_remove_link(&dev->parent->kobj, old_class_name); @@ -1239,13 +1553,12 @@ int device_rename(struct device *dev, char *new_name) } #else if (dev->class) { - sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); - error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, - dev->bus_id); - if (error) { - dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", - __FUNCTION__, error); - } + error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, + &dev->kobj, dev_name(dev)); + if (error) + goto out; + sysfs_remove_link(&dev->class->p->class_subsys.kobj, + old_device_name); } #endif @@ -1305,8 +1618,10 @@ out: * device_move - moves a device to a new parent * @dev: the pointer to the struct device to be moved * @new_parent: the new parent of the device (can by NULL) + * @dpm_order: how to reorder the dpm_list */ -int device_move(struct device *dev, struct device *new_parent) +int device_move(struct device *dev, struct device *new_parent, + enum dpm_order dpm_order) { int error; struct device *old_parent; @@ -1316,11 +1631,12 @@ int device_move(struct device *dev, struct device *new_parent) if (!dev) return -EINVAL; + device_pm_lock(); new_parent = get_device(new_parent); new_parent_kobj = get_device_parent(dev, new_parent); - pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, - __FUNCTION__, new_parent ? new_parent->bus_id : ""); + pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), + __func__, new_parent ? dev_name(new_parent) : ""); error = kobject_move(&dev->kobj, new_parent_kobj); if (error) { cleanup_glue_dir(dev, new_parent_kobj); @@ -1330,9 +1646,13 @@ int device_move(struct device *dev, struct device *new_parent) old_parent = dev->parent; dev->parent = new_parent; if (old_parent) - klist_remove(&dev->knode_parent); - if (new_parent) - klist_add_tail(&dev->knode_parent, &new_parent->klist_children); + klist_remove(&dev->p->knode_parent); + if (new_parent) { + klist_add_tail(&dev->p->knode_parent, + &new_parent->p->klist_children); + set_dev_node(dev, dev_to_node(new_parent)); + } + if (!dev->class) goto out_put; error = device_move_class_links(dev, old_parent, new_parent); @@ -1341,18 +1661,35 @@ int device_move(struct device *dev, struct device *new_parent) device_move_class_links(dev, new_parent, old_parent); if (!kobject_move(&dev->kobj, &old_parent->kobj)) { if (new_parent) - klist_remove(&dev->knode_parent); - if (old_parent) - klist_add_tail(&dev->knode_parent, - &old_parent->klist_children); + klist_remove(&dev->p->knode_parent); + dev->parent = old_parent; + if (old_parent) { + klist_add_tail(&dev->p->knode_parent, + &old_parent->p->klist_children); + set_dev_node(dev, dev_to_node(old_parent)); + } } cleanup_glue_dir(dev, new_parent_kobj); put_device(new_parent); goto out; } + switch (dpm_order) { + case DPM_ORDER_NONE: + break; + case DPM_ORDER_DEV_AFTER_PARENT: + device_pm_move_after(dev, new_parent); + break; + case DPM_ORDER_PARENT_BEFORE_DEV: + device_pm_move_before(new_parent, dev); + break; + case DPM_ORDER_DEV_LAST: + device_pm_move_last(dev); + break; + } out_put: put_device(old_parent); out: + device_pm_unlock(); put_device(dev); return error; } @@ -1375,4 +1712,8 @@ void device_shutdown(void) dev->driver->shutdown(dev); } } + kobject_put(sysfs_dev_char_kobj); + kobject_put(sysfs_dev_block_kobj); + kobject_put(dev_kobj); + async_synchronize_full(); }