'\" t
.\"     Title: struct class
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Device drivers infrastructure
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "STRUCT CLASS" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Device drivers infrastructure"
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.SH "NAME"
struct_class \- device classes
.SH "SYNOPSIS"
.sp
.nf
struct class {
  const char * name;
  struct module * owner;
  struct class_attribute * class_attrs;
  const struct attribute_group ** dev_groups;
  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;
};  
.fi
.SH "MEMBERS"
.PP
name
.RS 4
Name of the class\&.
.RE
.PP
owner
.RS 4
The module owner\&.
.RE
.PP
class_attrs
.RS 4
Default attributes of this class\&.
.RE
.PP
dev_groups
.RS 4
Default attributes of the devices that belong to the class\&.
.RE
.PP
dev_kobj
.RS 4
The kobject that represents this class and links it into the hierarchy\&.
.RE
.PP
dev_uevent
.RS 4
Called when a device is added, removed from this class, or a few other things that generate uevents to add the environment variables\&.
.RE
.PP
devnode
.RS 4
Callback to provide the devtmpfs\&.
.RE
.PP
class_release
.RS 4
Called to release this class\&.
.RE
.PP
dev_release
.RS 4
Called to release the device\&.
.RE
.PP
suspend
.RS 4
Used to put the device to sleep mode, usually to a low power state\&.
.RE
.PP
resume
.RS 4
Used to bring the device from the sleep mode\&.
.RE
.PP
ns_type
.RS 4
Callbacks so sysfs can detemine namespaces\&.
.RE
.PP
namespace
.RS 4
Namespace of the device belongs to this class\&.
.RE
.PP
pm
.RS 4
The default device power management operations of this class\&.
.RE
.PP
p
.RS 4
The private data of the driver core, no one other than the driver core can touch this\&.
.RE
.SH "DESCRIPTION"
.PP
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\&.
.SH "COPYRIGHT"
.br