| /* |
| * dim2_sysfs.c - MediaLB sysfs information |
| * |
| * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG |
| * |
| * 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. See the |
| * GNU General Public License for more details. |
| * |
| * This file is licensed under GPLv2. |
| */ |
| |
| /* Author: Andrey Shvetsov <andrey.shvetsov@k2l.de> */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include "dim2_sysfs.h" |
| |
| struct bus_attr { |
| struct attribute attr; |
| ssize_t (*show)(struct medialb_bus *bus, char *buf); |
| ssize_t (*store)(struct medialb_bus *bus, const char *buf, size_t count); |
| }; |
| |
| static ssize_t state_show(struct medialb_bus *bus, char *buf) |
| { |
| bool state = dim2_sysfs_get_state_cb(); |
| |
| return sprintf(buf, "%s\n", state ? "locked" : ""); |
| } |
| |
| static struct bus_attr state_attr = __ATTR_RO(state); |
| |
| static struct attribute *bus_default_attrs[] = { |
| &state_attr.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group bus_attr_group = { |
| .attrs = bus_default_attrs, |
| }; |
| |
| static void bus_kobj_release(struct kobject *kobj) |
| { |
| } |
| |
| static ssize_t bus_kobj_attr_show(struct kobject *kobj, struct attribute *attr, |
| char *buf) |
| { |
| struct medialb_bus *bus = |
| container_of(kobj, struct medialb_bus, kobj_group); |
| struct bus_attr *xattr = container_of(attr, struct bus_attr, attr); |
| |
| if (!xattr->show) |
| return -EIO; |
| |
| return xattr->show(bus, buf); |
| } |
| |
| static ssize_t bus_kobj_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *buf, size_t count) |
| { |
| ssize_t ret; |
| struct medialb_bus *bus = |
| container_of(kobj, struct medialb_bus, kobj_group); |
| struct bus_attr *xattr = container_of(attr, struct bus_attr, attr); |
| |
| if (!xattr->store) |
| return -EIO; |
| |
| ret = xattr->store(bus, buf, count); |
| return ret; |
| } |
| |
| static struct sysfs_ops const bus_kobj_sysfs_ops = { |
| .show = bus_kobj_attr_show, |
| .store = bus_kobj_attr_store, |
| }; |
| |
| static struct kobj_type bus_ktype = { |
| .release = bus_kobj_release, |
| .sysfs_ops = &bus_kobj_sysfs_ops, |
| }; |
| |
| int dim2_sysfs_probe(struct medialb_bus *bus, struct kobject *parent_kobj) |
| { |
| int err; |
| |
| kobject_init(&bus->kobj_group, &bus_ktype); |
| err = kobject_add(&bus->kobj_group, parent_kobj, "bus"); |
| if (err) { |
| pr_err("kobject_add() failed: %d\n", err); |
| goto err_kobject_add; |
| } |
| |
| err = sysfs_create_group(&bus->kobj_group, &bus_attr_group); |
| if (err) { |
| pr_err("sysfs_create_group() failed: %d\n", err); |
| goto err_create_group; |
| } |
| |
| return 0; |
| |
| err_create_group: |
| kobject_put(&bus->kobj_group); |
| |
| err_kobject_add: |
| return err; |
| } |
| |
| void dim2_sysfs_destroy(struct medialb_bus *bus) |
| { |
| kobject_put(&bus->kobj_group); |
| } |