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subsys_system_register(9) [centos man page]

SUBSYS_SYSTEM_REGIST(9) 				   Device drivers infrastructure				   SUBSYS_SYSTEM_REGIST(9)

subsys_system_register - register a subsystem at /sys/devices/system/ SYNOPSIS
int subsys_system_register(struct bus_type * subsys, const struct attribute_group ** groups); ARGUMENTS
subsys system subsystem groups default attributes for the root device DESCRIPTION
All 'system' subsystems have a /sys/devices/system/<name> root device with the name of the subsystem. The root device can carry subsystem- wide attributes. All registered devices are below this single root device and are named after the subsystem with a simple enumeration number appended. The registered devices are not explicitely named; only 'id' in the device needs to be set. Do not use this interface for anything new, it exists for compatibility with bad ideas only. New subsystems should use plain subsystems; and add the subsystem-wide attributes should be added to the subsystem directory itself and not some create fake root-device placed in /sys/devices/system/<name>. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SUBSYS_SYSTEM_REGIST(9)

Check Out this Related Man Page

cfg_configure(9r)														 cfg_configure(9r)

cfg_configure - General: Loads and configures a kernel subsystem SYNOPSIS
#include <sys/sysconfig.h>( ); cfg_status_t cfg_configure( char *subsys ); ARGUMENTS
Specifies the name of the subsystem to be configured. DESCRIPTION
The cfg_configure routine is used to configure a subsystem. If the subsystem is not loaded into the kernel, this routine loads the subsys- tem. The routine then configures the subsystem using the attribute settings from the /etc/sysconfigtab database. If no attributes are set in the database, the default values defined in the subsystem code are used. Each subsystem is contained in a module pointed to by subsystem-name.mod. For example, a subsystem named mysubsystem is contained in the mysubsystem.mod module file. This module file must exist in the /subsys, /var/subsys, or /sys/BINARY directory on the system you are con- figuring. The mysubsystem.mod file must include two things: The subsystem's attribute table, named mysubsystem_attributes[] The subsystem's configure routine, named mysubsystem_configure() Refer to the /usr/examples/cfgmgr.c file for an example of a sample subsystem. RETURN VALUES
This routine returns 32-bit values composed of subsystem status and framework status segments. The upper 16 bits is the subsystem status (CFG_STATUS_SUBSYS) and the lower 16 bits is the frame status (CFG_STATUS_FRAME). The return values are organized as follows:[Upper subsys- tem 16 bits][Lower framework 16 bits] The subsystem staus is returned by the subsystem's configure routine and can be any error in errno.h. The framework status is returned by the configuration framework; the possible values are defined in <sys/sysconfig.h> as CFG_FRAME_Exxx. A successful operation has ESUCCESS(0) returned in both status segments. See the cfg_errno(9r) and errno(2) reference pages for more details about error numbers and status. EXAMPLE
A subsystem may be configured using the cfg_configure kernel routine as follows: status = cfg_configure(subsystem_name); SEE ALSO
Routines: cfg_subsys_config(3), cfg_query(9r), cfg_reconfigure(9r), cfg_subsysop(9r), cfg_unconfigure(9r) Other: errno(2) cfg_configure(9r)
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