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/*
* PowerNV OPAL Sensor-groups interface
*
* Copyright 2017 IBM Corp.
*
* 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.
*/
#define pr_fmt(fmt) "opal-sensor-groups: " fmt
#include <linux/of.h>
#include <linux/kobject.h>
#include <linux/slab.h>
#include <asm/opal.h>
DEFINE_MUTEX(sg_mutex);
static struct kobject *sg_kobj;
struct sg_attr {
u32 handle;
struct kobj_attribute attr;
};
static struct sensor_group {
char name[20];
struct attribute_group sg;
struct sg_attr *sgattrs;
} *sgs;
static ssize_t sg_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct sg_attr *sattr = container_of(attr, struct sg_attr, attr);
struct opal_msg msg;
u32 data;
int ret, token;
ret = kstrtoint(buf, 0, &data);
if (ret)
return ret;
if (data != 1)
return -EINVAL;
token = opal_async_get_token_interruptible();
if (token < 0) {
pr_devel("Failed to get token\n");
return token;
}
ret = mutex_lock_interruptible(&sg_mutex);
if (ret)
goto out_token;
ret = opal_sensor_group_clear(sattr->handle, token);
switch (ret) {
case OPAL_ASYNC_COMPLETION:
ret = opal_async_wait_response(token, &msg);
if (ret) {
pr_devel("Failed to wait for the async response\n");
ret = -EIO;
goto out;
}
ret = opal_error_code(opal_get_async_rc(msg));
if (!ret)
ret = count;
break;
case OPAL_SUCCESS:
ret = count;
break;
default:
ret = opal_error_code(ret);
}
out:
mutex_unlock(&sg_mutex);
out_token:
opal_async_release_token(token);
return ret;
}
static struct sg_ops_info {
int opal_no;
const char *attr_name;
ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count);
} ops_info[] = {
{ OPAL_SENSOR_GROUP_CLEAR, "clear", sg_store },
};
static void add_attr(int handle, struct sg_attr *attr, int index)
{
attr->handle = handle;
sysfs_attr_init(&attr->attr.attr);
attr->attr.attr.name = ops_info[index].attr_name;
attr->attr.attr.mode = 0220;
attr->attr.store = ops_info[index].store;
}
static int add_attr_group(const __be32 *ops, int len, struct sensor_group *sg,
u32 handle)
{
int i, j;
int count = 0;
for (i = 0; i < len; i++)
for (j = 0; j < ARRAY_SIZE(ops_info); j++)
if (be32_to_cpu(ops[i]) == ops_info[j].opal_no) {
add_attr(handle, &sg->sgattrs[count], j);
sg->sg.attrs[count] =
&sg->sgattrs[count].attr.attr;
count++;
}
return sysfs_create_group(sg_kobj, &sg->sg);
}
static int get_nr_attrs(const __be32 *ops, int len)
{
int i, j;
int nr_attrs = 0;
for (i = 0; i < len; i++)
for (j = 0; j < ARRAY_SIZE(ops_info); j++)
if (be32_to_cpu(ops[i]) == ops_info[j].opal_no)
nr_attrs++;
return nr_attrs;
}
void __init opal_sensor_groups_init(void)
{
struct device_node *sg, *node;
int i = 0;
sg = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
if (!sg) {
pr_devel("Sensor groups node not found\n");
return;
}
sgs = kcalloc(of_get_child_count(sg), sizeof(*sgs), GFP_KERNEL);
if (!sgs)
return;
sg_kobj = kobject_create_and_add("sensor_groups", opal_kobj);
if (!sg_kobj) {
pr_warn("Failed to create sensor group kobject\n");
goto out_sgs;
}
for_each_child_of_node(sg, node) {
const __be32 *ops;
u32 sgid, len, nr_attrs, chipid;
ops = of_get_property(node, "ops", &len);
if (!ops)
continue;
nr_attrs = get_nr_attrs(ops, len);
if (!nr_attrs)
continue;
sgs[i].sgattrs = kcalloc(nr_attrs, sizeof(*sgs[i].sgattrs),
GFP_KERNEL);
if (!sgs[i].sgattrs)
goto out_sgs_sgattrs;
sgs[i].sg.attrs = kcalloc(nr_attrs + 1,
sizeof(*sgs[i].sg.attrs),
GFP_KERNEL);
if (!sgs[i].sg.attrs) {
kfree(sgs[i].sgattrs);
goto out_sgs_sgattrs;
}
if (of_property_read_u32(node, "sensor-group-id", &sgid)) {
pr_warn("sensor-group-id property not found\n");
goto out_sgs_sgattrs;
}
if (!of_property_read_u32(node, "ibm,chip-id", &chipid))
sprintf(sgs[i].name, "%s%d", node->name, chipid);
else
sprintf(sgs[i].name, "%s", node->name);
sgs[i].sg.name = sgs[i].name;
if (add_attr_group(ops, len, &sgs[i], sgid)) {
pr_warn("Failed to create sensor attribute group %s\n",
sgs[i].sg.name);
goto out_sgs_sgattrs;
}
i++;
}
return;
out_sgs_sgattrs:
while (--i >= 0) {
kfree(sgs[i].sgattrs);
kfree(sgs[i].sg.attrs);
}
kobject_put(sg_kobj);
out_sgs:
kfree(sgs);
}
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