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- /*
- * 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);
- }
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