2 * PowerNV OPAL Sensor-groups interface
4 * Copyright 2017 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #define pr_fmt(fmt) "opal-sensor-groups: " fmt
15 #include <linux/kobject.h>
16 #include <linux/slab.h>
20 DEFINE_MUTEX(sg_mutex);
22 static struct kobject *sg_kobj;
26 struct kobj_attribute attr;
29 static struct sensor_group {
31 struct attribute_group sg;
32 struct sg_attr *sgattrs;
35 static ssize_t sg_store(struct kobject *kobj, struct kobj_attribute *attr,
36 const char *buf, size_t count)
38 struct sg_attr *sattr = container_of(attr, struct sg_attr, attr);
43 ret = kstrtoint(buf, 0, &data);
50 token = opal_async_get_token_interruptible();
52 pr_devel("Failed to get token\n");
56 ret = mutex_lock_interruptible(&sg_mutex);
60 ret = opal_sensor_group_clear(sattr->handle, token);
62 case OPAL_ASYNC_COMPLETION:
63 ret = opal_async_wait_response(token, &msg);
65 pr_devel("Failed to wait for the async response\n");
69 ret = opal_error_code(opal_get_async_rc(msg));
77 ret = opal_error_code(ret);
81 mutex_unlock(&sg_mutex);
83 opal_async_release_token(token);
87 static struct sg_ops_info {
89 const char *attr_name;
90 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
91 const char *buf, size_t count);
93 { OPAL_SENSOR_GROUP_CLEAR, "clear", sg_store },
96 static void add_attr(int handle, struct sg_attr *attr, int index)
98 attr->handle = handle;
99 sysfs_attr_init(&attr->attr.attr);
100 attr->attr.attr.name = ops_info[index].attr_name;
101 attr->attr.attr.mode = 0220;
102 attr->attr.store = ops_info[index].store;
105 static int add_attr_group(const __be32 *ops, int len, struct sensor_group *sg,
111 for (i = 0; i < len; i++)
112 for (j = 0; j < ARRAY_SIZE(ops_info); j++)
113 if (be32_to_cpu(ops[i]) == ops_info[j].opal_no) {
114 add_attr(handle, &sg->sgattrs[count], j);
115 sg->sg.attrs[count] =
116 &sg->sgattrs[count].attr.attr;
120 return sysfs_create_group(sg_kobj, &sg->sg);
123 static int get_nr_attrs(const __be32 *ops, int len)
128 for (i = 0; i < len; i++)
129 for (j = 0; j < ARRAY_SIZE(ops_info); j++)
130 if (be32_to_cpu(ops[i]) == ops_info[j].opal_no)
136 void __init opal_sensor_groups_init(void)
138 struct device_node *sg, *node;
141 sg = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
143 pr_devel("Sensor groups node not found\n");
147 sgs = kcalloc(of_get_child_count(sg), sizeof(*sgs), GFP_KERNEL);
151 sg_kobj = kobject_create_and_add("sensor_groups", opal_kobj);
153 pr_warn("Failed to create sensor group kobject\n");
157 for_each_child_of_node(sg, node) {
159 u32 sgid, len, nr_attrs, chipid;
161 ops = of_get_property(node, "ops", &len);
165 nr_attrs = get_nr_attrs(ops, len);
169 sgs[i].sgattrs = kcalloc(nr_attrs, sizeof(struct sg_attr),
172 goto out_sgs_sgattrs;
174 sgs[i].sg.attrs = kcalloc(nr_attrs + 1,
175 sizeof(struct attribute *),
178 if (!sgs[i].sg.attrs) {
179 kfree(sgs[i].sgattrs);
180 goto out_sgs_sgattrs;
183 if (of_property_read_u32(node, "sensor-group-id", &sgid)) {
184 pr_warn("sensor-group-id property not found\n");
185 goto out_sgs_sgattrs;
188 if (!of_property_read_u32(node, "ibm,chip-id", &chipid))
189 sprintf(sgs[i].name, "%s%d", node->name, chipid);
191 sprintf(sgs[i].name, "%s", node->name);
193 sgs[i].sg.name = sgs[i].name;
194 if (add_attr_group(ops, len, &sgs[i], sgid)) {
195 pr_warn("Failed to create sensor attribute group %s\n",
197 goto out_sgs_sgattrs;
206 kfree(sgs[i].sgattrs);
207 kfree(sgs[i].sg.attrs);
209 kobject_put(sg_kobj);