2017-08-10 11:31:20 +08:00
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/*
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* PowerNV OPAL Sensor-groups interface
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*
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* Copyright 2017 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "opal-sensor-groups: " fmt
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#include <linux/of.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <asm/opal.h>
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DEFINE_MUTEX(sg_mutex);
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static struct kobject *sg_kobj;
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struct sg_attr {
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u32 handle;
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struct kobj_attribute attr;
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};
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static struct sensor_group {
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char name[20];
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struct attribute_group sg;
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struct sg_attr *sgattrs;
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} *sgs;
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static ssize_t sg_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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struct sg_attr *sattr = container_of(attr, struct sg_attr, attr);
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struct opal_msg msg;
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u32 data;
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int ret, token;
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ret = kstrtoint(buf, 0, &data);
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if (ret)
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return ret;
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if (data != 1)
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return -EINVAL;
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token = opal_async_get_token_interruptible();
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if (token < 0) {
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pr_devel("Failed to get token\n");
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return token;
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}
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ret = mutex_lock_interruptible(&sg_mutex);
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if (ret)
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goto out_token;
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ret = opal_sensor_group_clear(sattr->handle, token);
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switch (ret) {
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case OPAL_ASYNC_COMPLETION:
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ret = opal_async_wait_response(token, &msg);
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if (ret) {
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pr_devel("Failed to wait for the async response\n");
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ret = -EIO;
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goto out;
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}
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ret = opal_error_code(opal_get_async_rc(msg));
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if (!ret)
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ret = count;
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break;
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case OPAL_SUCCESS:
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ret = count;
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break;
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default:
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ret = opal_error_code(ret);
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}
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out:
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mutex_unlock(&sg_mutex);
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out_token:
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opal_async_release_token(token);
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return ret;
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}
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static struct sg_ops_info {
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int opal_no;
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const char *attr_name;
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ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t count);
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} ops_info[] = {
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{ OPAL_SENSOR_GROUP_CLEAR, "clear", sg_store },
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};
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static void add_attr(int handle, struct sg_attr *attr, int index)
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{
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attr->handle = handle;
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sysfs_attr_init(&attr->attr.attr);
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attr->attr.attr.name = ops_info[index].attr_name;
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attr->attr.attr.mode = 0220;
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attr->attr.store = ops_info[index].store;
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}
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static int add_attr_group(const __be32 *ops, int len, struct sensor_group *sg,
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u32 handle)
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{
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int i, j;
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int count = 0;
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for (i = 0; i < len; i++)
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for (j = 0; j < ARRAY_SIZE(ops_info); j++)
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if (be32_to_cpu(ops[i]) == ops_info[j].opal_no) {
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add_attr(handle, &sg->sgattrs[count], j);
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sg->sg.attrs[count] =
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&sg->sgattrs[count].attr.attr;
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count++;
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}
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return sysfs_create_group(sg_kobj, &sg->sg);
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}
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static int get_nr_attrs(const __be32 *ops, int len)
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{
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int i, j;
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int nr_attrs = 0;
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for (i = 0; i < len; i++)
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for (j = 0; j < ARRAY_SIZE(ops_info); j++)
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if (be32_to_cpu(ops[i]) == ops_info[j].opal_no)
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nr_attrs++;
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return nr_attrs;
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}
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void __init opal_sensor_groups_init(void)
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{
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struct device_node *sg, *node;
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int i = 0;
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sg = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
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if (!sg) {
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pr_devel("Sensor groups node not found\n");
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return;
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}
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sgs = kcalloc(of_get_child_count(sg), sizeof(*sgs), GFP_KERNEL);
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if (!sgs)
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return;
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sg_kobj = kobject_create_and_add("sensor_groups", opal_kobj);
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if (!sg_kobj) {
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pr_warn("Failed to create sensor group kobject\n");
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goto out_sgs;
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}
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for_each_child_of_node(sg, node) {
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const __be32 *ops;
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u32 sgid, len, nr_attrs, chipid;
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ops = of_get_property(node, "ops", &len);
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if (!ops)
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continue;
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nr_attrs = get_nr_attrs(ops, len);
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if (!nr_attrs)
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continue;
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2017-01-20 00:15:30 +08:00
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sgs[i].sgattrs = kcalloc(nr_attrs, sizeof(*sgs[i].sgattrs),
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2017-08-10 11:31:20 +08:00
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GFP_KERNEL);
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if (!sgs[i].sgattrs)
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goto out_sgs_sgattrs;
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sgs[i].sg.attrs = kcalloc(nr_attrs + 1,
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2017-01-20 00:15:30 +08:00
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sizeof(*sgs[i].sg.attrs),
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2017-08-10 11:31:20 +08:00
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GFP_KERNEL);
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if (!sgs[i].sg.attrs) {
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kfree(sgs[i].sgattrs);
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goto out_sgs_sgattrs;
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}
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if (of_property_read_u32(node, "sensor-group-id", &sgid)) {
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pr_warn("sensor-group-id property not found\n");
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goto out_sgs_sgattrs;
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}
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if (!of_property_read_u32(node, "ibm,chip-id", &chipid))
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sprintf(sgs[i].name, "%s%d", node->name, chipid);
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else
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sprintf(sgs[i].name, "%s", node->name);
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sgs[i].sg.name = sgs[i].name;
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if (add_attr_group(ops, len, &sgs[i], sgid)) {
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pr_warn("Failed to create sensor attribute group %s\n",
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sgs[i].sg.name);
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goto out_sgs_sgattrs;
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}
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i++;
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}
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return;
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out_sgs_sgattrs:
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while (--i >= 0) {
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kfree(sgs[i].sgattrs);
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kfree(sgs[i].sg.attrs);
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}
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kobject_put(sg_kobj);
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out_sgs:
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kfree(sgs);
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}
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