-/* businst_attr.c
- *
- * Copyright (C) 2010 - 2013 UNISYS CORPORATION
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for more
- * details.
- */
-
-/* This is actually something they forgot to put in the kernel.
- * struct bus_type in the kernel SHOULD have a "busses" member, which
- * should be treated similarly to the "devices" and "drivers" members.
- * There SHOULD be:
- * - a "businst_attribute" analogous to the existing "bus_attribute"
- * - a "businst_create_file" and "businst_remove_file" analogous to the
- * existing "bus_create_file" and "bus_remove_file".
- * That's what I created businst.c and businst.h to do.
- *
- * We want to add the "busses" sub-tree in sysfs, where we will house the
- * names and properties of each bus instance:
- *
- * /sys/bus/<bustypename>/
- * version
- * devices
- * <devname1> --> /sys/devices/<businstancename><devname1>
- * <devname2> --> /sys/devices/<businstancename><devname2>
- * drivers
- * <driverinstancename1>
- * <driverinstance1property1>
- * <driverinstance1property2>
- * ...
- * <driverinstancename2>
- * <driverinstance2property1>
- * <driverinstance2property2>
- * ...
- * >> busses
- * >> <businstancename1>
- * >> <businstance1property1>
- * >> <businstance1property2>
- * >> ...
- * >> <businstancename2>
- * >> <businstance2property1>
- * >> <businstance2property2>
- * >> ...
- *
- * I considered adding bus instance properties under
- * /sys/devices/<businstancename>. But I thought there may be existing
- * notions that ONLY device sub-trees should live under
- * /sys/devices/<businstancename>. So I stayed out of there.
- *
- */
-
-#include "businst_attr.h"
-
-#define to_businst_attr(_attr) \
- container_of(_attr, struct businst_attribute, attr)
-#define to_visorbus_devdata(obj) \
- container_of(obj, struct visorbus_devdata, kobj)
-#define CURRENT_FILE_PC VISOR_BUS_PC_businst_attr_c
-
-ssize_t businst_attr_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- struct businst_attribute *businst_attr = to_businst_attr(attr);
- struct visorbus_devdata *bus = to_visorbus_devdata(kobj);
- ssize_t ret = 0;
-
- if (businst_attr->show)
- ret = businst_attr->show(bus, buf);
- return ret;
-}
-
-ssize_t businst_attr_store(struct kobject *kobj, struct attribute *attr,
- const char *buf, size_t count)
-{
- struct businst_attribute *businst_attr = to_businst_attr(attr);
- struct visorbus_devdata *bus = to_visorbus_devdata(kobj);
- ssize_t ret = 0;
-
- if (businst_attr->store)
- ret = businst_attr->store(bus, buf, count);
- return ret;
-}
-
-int businst_create_file(struct visorbus_devdata *bus,
- struct businst_attribute *attr)
-{
- return sysfs_create_file(&bus->kobj, &attr->attr);
-}
-
-void businst_remove_file(struct visorbus_devdata *bus,
- struct businst_attribute *attr)
-{
- sysfs_remove_file(&bus->kobj, &attr->attr);
-}