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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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