diff options
Diffstat (limited to 'drivers/base/core.c')
| -rw-r--r-- | drivers/base/core.c | 241 |
1 files changed, 221 insertions, 20 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 68ad11af22b4..e4b530ef757d 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -17,6 +17,7 @@ #include <linux/slab.h> #include <linux/string.h> #include <linux/kdev_t.h> +#include <linux/notifier.h> #include <asm/semaphore.h> @@ -153,20 +154,24 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp, "MINOR=%u", MINOR(dev->devt)); } +#ifdef CONFIG_SYSFS_DEPRECATED /* add bus name (same as SUBSYSTEM, deprecated) */ if (dev->bus) add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVBUS=%s", dev->bus->name); +#endif /* add driver name (PHYSDEV* values are deprecated)*/ if (dev->driver) { add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, "DRIVER=%s", dev->driver->name); +#ifdef CONFIG_SYSFS_DEPRECATED add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, "PHYSDEVDRIVER=%s", dev->driver->name); +#endif } /* terminate, set to next free slot, shrink available space */ @@ -383,6 +388,52 @@ void device_initialize(struct device *dev) device_init_wakeup(dev, 0); } +#ifdef CONFIG_SYSFS_DEPRECATED +static int setup_parent(struct device *dev, struct device *parent) +{ + /* Set the parent to the class, not the parent device */ + /* this keeps sysfs from having a symlink to make old udevs happy */ + if (dev->class) + dev->kobj.parent = &dev->class->subsys.kset.kobj; + else if (parent) + dev->kobj.parent = &parent->kobj; + + return 0; +} +#else +static int virtual_device_parent(struct device *dev) +{ + if (!dev->class) + return -ENODEV; + + if (!dev->class->virtual_dir) { + static struct kobject *virtual_dir = NULL; + + if (!virtual_dir) + virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual"); + dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name); + } + + dev->kobj.parent = dev->class->virtual_dir; + return 0; +} + +static int setup_parent(struct device *dev, struct device *parent) +{ + int error; + + /* if this is a class device, and has no parent, create one */ + if ((dev->class) && (parent == NULL)) { + error = virtual_device_parent(dev); + if (error) + return error; + } else if (parent) + dev->kobj.parent = &parent->kobj; + + return 0; +} +#endif + /** * device_add - add device to device hierarchy. * @dev: device. @@ -405,29 +456,29 @@ int device_add(struct device *dev) if (!dev || !strlen(dev->bus_id)) goto Error; - /* if this is a class device, and has no parent, create one */ - if ((dev->class) && (dev->parent == NULL)) { - error = virtual_device_parent(dev); - if (error) - goto Error; - } + pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); parent = get_device(dev->parent); - pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); + error = setup_parent(dev, parent); + if (error) + goto Error; /* first, register with generic layer. */ kobject_set_name(&dev->kobj, "%s", dev->bus_id); - if (parent) - dev->kobj.parent = &parent->kobj; - - if ((error = kobject_add(&dev->kobj))) + error = kobject_add(&dev->kobj); + if (error) goto Error; /* notify platform of device entry */ if (platform_notify) platform_notify(dev); + /* notify clients of device entry (new way) */ + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->bus_notifier, + BUS_NOTIFY_ADD_DEVICE, dev); + dev->uevent_attr.attr.name = "uevent"; dev->uevent_attr.attr.mode = S_IWUSR; if (dev->driver) @@ -461,13 +512,18 @@ int device_add(struct device *dev) if (dev->class) { sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj, "subsystem"); - sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj, - dev->bus_id); + /* If this is not a "fake" compatible device, then create the + * symlink from the class to the device. */ + if (dev->kobj.parent != &dev->class->subsys.kset.kobj) + sysfs_create_link(&dev->class->subsys.kset.kobj, + &dev->kobj, dev->bus_id); +#ifdef CONFIG_SYSFS_DEPRECATED if (parent) { sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device"); class_name = make_class_name(dev->class->name, &dev->kobj); sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name); } +#endif } if ((error = device_add_attrs(dev))) @@ -504,6 +560,9 @@ int device_add(struct device *dev) BusError: device_pm_remove(dev); PMError: + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->bus_notifier, + BUS_NOTIFY_DEL_DEVICE, dev); device_remove_groups(dev); GroupError: device_remove_attrs(dev); @@ -586,22 +645,31 @@ void put_device(struct device * dev) void device_del(struct device * dev) { struct device * parent = dev->parent; - char *class_name = NULL; struct class_interface *class_intf; if (parent) klist_del(&dev->knode_parent); - if (dev->devt_attr) + if (dev->devt_attr) { device_remove_file(dev, dev->devt_attr); + kfree(dev->devt_attr); + } if (dev->class) { sysfs_remove_link(&dev->kobj, "subsystem"); - sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id); - class_name = make_class_name(dev->class->name, &dev->kobj); + /* If this is not a "fake" compatible device, remove the + * symlink from the class to the device. */ + if (dev->kobj.parent != &dev->class->subsys.kset.kobj) + sysfs_remove_link(&dev->class->subsys.kset.kobj, + dev->bus_id); +#ifdef CONFIG_SYSFS_DEPRECATED if (parent) { - sysfs_remove_link(&dev->kobj, "device"); + char *class_name = make_class_name(dev->class->name, + &dev->kobj); sysfs_remove_link(&dev->parent->kobj, class_name); + kfree(class_name); + sysfs_remove_link(&dev->kobj, "device"); } - kfree(class_name); +#endif + down(&dev->class->sem); /* notify any interfaces that the device is now gone */ list_for_each_entry(class_intf, &dev->class->interfaces, node) @@ -614,13 +682,16 @@ void device_del(struct device * dev) device_remove_file(dev, &dev->uevent_attr); device_remove_groups(dev); device_remove_attrs(dev); + bus_remove_device(dev); /* Notify the platform of the removal, in case they * need to do anything... */ if (platform_notify_remove) platform_notify_remove(dev); - bus_remove_device(dev); + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->bus_notifier, + BUS_NOTIFY_DEL_DEVICE, dev); device_pm_remove(dev); kobject_uevent(&dev->kobj, KOBJ_REMOVE); kobject_del(&dev->kobj); @@ -679,12 +750,45 @@ int device_for_each_child(struct device * parent, void * data, return error; } +/** + * device_find_child - device iterator for locating a particular device. + * @parent: parent struct device + * @data: Data to pass to match function + * @match: Callback function to check device + * + * This is similar to the device_for_each_child() function above, but it + * returns a reference to a device that is 'found' for later use, as + * determined by the @match callback. + * + * The callback should return 0 if the device doesn't match and non-zero + * if it does. If the callback returns non-zero and a reference to the + * current device can be obtained, this function will return to the caller + * and not iterate over any more devices. + */ +struct device * device_find_child(struct device *parent, void *data, + int (*match)(struct device *, void *)) +{ + struct klist_iter i; + struct device *child; + + if (!parent) + return NULL; + + klist_iter_init(&parent->klist_children, &i); + while ((child = next_device(&i))) + if (match(child, data) && get_device(child)) + break; + klist_iter_exit(&i); + return child; +} + int __init devices_init(void) { return subsystem_register(&devices_subsys); } EXPORT_SYMBOL_GPL(device_for_each_child); +EXPORT_SYMBOL_GPL(device_find_child); EXPORT_SYMBOL_GPL(device_initialize); EXPORT_SYMBOL_GPL(device_add); @@ -807,8 +911,10 @@ int device_rename(struct device *dev, char *new_name) pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); +#ifdef CONFIG_SYSFS_DEPRECATED if ((dev->class) && (dev->parent)) old_class_name = make_class_name(dev->class->name, &dev->kobj); +#endif if (dev->class) { old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); @@ -823,6 +929,7 @@ int device_rename(struct device *dev, char *new_name) error = kobject_rename(&dev->kobj, new_name); +#ifdef CONFIG_SYSFS_DEPRECATED if (old_class_name) { new_class_name = make_class_name(dev->class->name, &dev->kobj); if (new_class_name) { @@ -831,6 +938,8 @@ int device_rename(struct device *dev, char *new_name) sysfs_remove_link(&dev->parent->kobj, old_class_name); } } +#endif + if (dev->class) { sysfs_remove_link(&dev->class->subsys.kset.kobj, old_symlink_name); @@ -846,3 +955,95 @@ int device_rename(struct device *dev, char *new_name) return error; } + + +static int device_move_class_links(struct device *dev, + struct device *old_parent, + struct device *new_parent) +{ +#ifdef CONFIG_SYSFS_DEPRECATED + int error; + char *class_name; + + class_name = make_class_name(dev->class->name, &dev->kobj); + if (!class_name) { + error = PTR_ERR(class_name); + class_name = NULL; + goto out; + } + if (old_parent) { + sysfs_remove_link(&dev->kobj, "device"); + sysfs_remove_link(&old_parent->kobj, class_name); + } + error = sysfs_create_link(&dev->kobj, &new_parent->kobj, "device"); + if (error) + goto out; + error = sysfs_create_link(&new_parent->kobj, &dev->kobj, class_name); + if (error) + sysfs_remove_link(&dev->kobj, "device"); +out: + kfree(class_name); + return error; +#else + return 0; +#endif +} + +/** + * 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 + */ +int device_move(struct device *dev, struct device *new_parent) +{ + int error; + struct device *old_parent; + + dev = get_device(dev); + if (!dev) + return -EINVAL; + + if (!device_is_registered(dev)) { + error = -EINVAL; + goto out; + } + new_parent = get_device(new_parent); + if (!new_parent) { + error = -EINVAL; + goto out; + } + pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, + new_parent->bus_id); + error = kobject_move(&dev->kobj, &new_parent->kobj); + if (error) { + put_device(new_parent); + goto out; + } + old_parent = dev->parent; + dev->parent = new_parent; + if (old_parent) + klist_remove(&dev->knode_parent); + klist_add_tail(&dev->knode_parent, &new_parent->klist_children); + if (!dev->class) + goto out_put; + error = device_move_class_links(dev, old_parent, new_parent); + if (error) { + /* We ignore errors on cleanup since we're hosed anyway... */ + device_move_class_links(dev, new_parent, old_parent); + if (!kobject_move(&dev->kobj, &old_parent->kobj)) { + klist_remove(&dev->knode_parent); + if (old_parent) + klist_add_tail(&dev->knode_parent, + &old_parent->klist_children); + } + put_device(new_parent); + goto out; + } +out_put: + put_device(old_parent); +out: + put_device(dev); + return error; +} + +EXPORT_SYMBOL_GPL(device_move); |