1. NAME▲

struct_class - device classes

2. SYNOPSIS ▲



 
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struct class {
  const char * name;
  struct module * owner;
  struct class_attribute * class_attrs;
  struct device_attribute * dev_attrs;
  struct bin_attribute * dev_bin_attrs;
  struct kobject * dev_kobj;
  int (* dev_uevent) (struct device *dev, struct kobj_uevent_env *env);
  char *(* devnode) (struct device *dev, umode_t *mode);
  void (* class_release) (struct class *class);
  void (* dev_release) (struct device *dev);
  int (* suspend) (struct device *dev, pm_message_t state);
  int (* resume) (struct device *dev);
  const struct kobj_ns_type_operations * ns_type;
  const void *(* namespace) (struct device *dev);
  const struct dev_pm_ops * pm;
  struct subsys_private * p;
};

3. MEMBERS ▲

name
    Name of the class.

owner
    The module owner.

class_attrs
    Default attributes of this class.

dev_attrs
    Default attributes of the devices belong to the class.

dev_bin_attrs
    Default binary attributes of the devices belong to the class.

dev_kobj
    The kobject that represents this class and links it into the hierarchy.

dev_uevent
    Called when a device is added, removed from this class, or a few other things that generate uevents to add the environment variables.

devnode
    Callback to provide the devtmpfs.

class_release
    Called to release this class.

dev_release
    Called to release the device.

suspend
    Used to put the device to sleep mode, usually to a low power state.

resume
    Used to bring the device from the sleep mode.

ns_type
    Callbacks so sysfs can detemine namespaces.

namespace
    Namespace of the device belongs to this class.

pm
    The default device power management operations of this class.

p
    The private data of the driver core, no one other than the driver core can touch this.

4. DESCRIPTION ▲

A class is a higher-level view of a device that abstracts out low-level implementation details. Drivers may see a SCSI disk or an ATA disk, but, at the class level, they are all simply disks. Classes allow user space to work with devices based on what they do, rather than how they are connected or how they work.

5. COPYRIGHT ▲