diff options
author | Dmitry Torokhov <dtor_core@ameritech.net> | 2005-07-10 01:21:24 -0500 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-09-05 16:03:10 -0700 |
commit | 76d1ce00bdd76c2987fbfb763cd40447413a55b3 (patch) | |
tree | 153a44b7e0821d75b6dcd829a0648c62a5bc6fb9 /drivers/base | |
parent | d65da6eae10cc77f93ead0188cde0b45f124d912 (diff) |
[PATCH] Driver core: link device and all class devices derived from it.
Driver core: link device and all class devices derived from it.
To ease the task of locating class devices derived from a certain
device create symlinks from parent device to its class devices.
Change USB host class device name from usbX to usb_hostX to avoid
conflict when creating aforementioned links.
Tweaked by Greg to have the symlink be "class_name:class_device_name" in
order to prevent duplicate links.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/class.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c index 0154a1623b21..d207296b18dc 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -452,10 +452,29 @@ void class_device_initialize(struct class_device *class_dev) INIT_LIST_HEAD(&class_dev->node); } +static char *make_class_name(struct class_device *class_dev) +{ + char *name; + int size; + + size = strlen(class_dev->class->name) + + strlen(kobject_name(&class_dev->kobj)) + 2; + + name = kmalloc(size, GFP_KERNEL); + if (!name) + return ERR_PTR(-ENOMEM); + + strcpy(name, class_dev->class->name); + strcat(name, ":"); + strcat(name, kobject_name(&class_dev->kobj)); + return name; +} + int class_device_add(struct class_device *class_dev) { struct class * parent = NULL; struct class_interface * class_intf; + char *class_name = NULL; int error; class_dev = class_device_get(class_dev); @@ -500,9 +519,13 @@ int class_device_add(struct class_device *class_dev) } class_device_add_attrs(class_dev); - if (class_dev->dev) + if (class_dev->dev) { + class_name = make_class_name(class_dev); sysfs_create_link(&class_dev->kobj, &class_dev->dev->kobj, "device"); + sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj, + class_name); + } /* notify any interfaces this device is now here */ if (parent) { @@ -519,6 +542,7 @@ int class_device_add(struct class_device *class_dev) if (error && parent) class_put(parent); class_device_put(class_dev); + kfree(class_name); return error; } @@ -584,6 +608,7 @@ void class_device_del(struct class_device *class_dev) { struct class * parent = class_dev->class; struct class_interface * class_intf; + char *class_name = NULL; if (parent) { down(&parent->sem); @@ -594,8 +619,11 @@ void class_device_del(struct class_device *class_dev) up(&parent->sem); } - if (class_dev->dev) + if (class_dev->dev) { + class_name = make_class_name(class_dev); sysfs_remove_link(&class_dev->kobj, "device"); + sysfs_remove_link(&class_dev->dev->kobj, class_name); + } if (class_dev->devt_attr) class_device_remove_file(class_dev, class_dev->devt_attr); class_device_remove_attrs(class_dev); @@ -605,6 +633,7 @@ void class_device_del(struct class_device *class_dev) if (parent) class_put(parent); + kfree(class_name); } void class_device_unregister(struct class_device *class_dev) |