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 int sensor_group_enable(u32 handle, bool enable)
40 token = opal_async_get_token_interruptible();
44 ret = opal_sensor_group_enable(handle, token, enable);
45 if (ret == OPAL_ASYNC_COMPLETION) {
46 ret = opal_async_wait_response(token, &msg);
48 pr_devel("Failed to wait for the async response\n");
52 ret = opal_error_code(opal_get_async_rc(msg));
54 ret = opal_error_code(ret);
58 opal_async_release_token(token);
61 EXPORT_SYMBOL_GPL(sensor_group_enable);
63 static ssize_t sg_store(struct kobject *kobj, struct kobj_attribute *attr,
64 const char *buf, size_t count)
66 struct sg_attr *sattr = container_of(attr, struct sg_attr, attr);
71 ret = kstrtoint(buf, 0, &data);
78 token = opal_async_get_token_interruptible();
80 pr_devel("Failed to get token\n");
84 ret = mutex_lock_interruptible(&sg_mutex);
88 ret = opal_sensor_group_clear(sattr->handle, token);
90 case OPAL_ASYNC_COMPLETION:
91 ret = opal_async_wait_response(token, &msg);
93 pr_devel("Failed to wait for the async response\n");
97 ret = opal_error_code(opal_get_async_rc(msg));
105 ret = opal_error_code(ret);
109 mutex_unlock(&sg_mutex);
111 opal_async_release_token(token);
115 static struct sg_ops_info {
117 const char *attr_name;
118 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
119 const char *buf, size_t count);
121 { OPAL_SENSOR_GROUP_CLEAR, "clear", sg_store },
124 static void add_attr(int handle, struct sg_attr *attr, int index)
126 attr->handle = handle;
127 sysfs_attr_init(&attr->attr.attr);
128 attr->attr.attr.name = ops_info[index].attr_name;
129 attr->attr.attr.mode = 0220;
130 attr->attr.store = ops_info[index].store;
133 static int add_attr_group(const __be32 *ops, int len, struct sensor_group *sg,
139 for (i = 0; i < len; i++)
140 for (j = 0; j < ARRAY_SIZE(ops_info); j++)
141 if (be32_to_cpu(ops[i]) == ops_info[j].opal_no) {
142 add_attr(handle, &sg->sgattrs[count], j);
143 sg->sg.attrs[count] =
144 &sg->sgattrs[count].attr.attr;
148 return sysfs_create_group(sg_kobj, &sg->sg);
151 static int get_nr_attrs(const __be32 *ops, int len)
156 for (i = 0; i < len; i++)
157 for (j = 0; j < ARRAY_SIZE(ops_info); j++)
158 if (be32_to_cpu(ops[i]) == ops_info[j].opal_no)
164 void __init opal_sensor_groups_init(void)
166 struct device_node *sg, *node;
169 sg = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
171 pr_devel("Sensor groups node not found\n");
175 sgs = kcalloc(of_get_child_count(sg), sizeof(*sgs), GFP_KERNEL);
179 sg_kobj = kobject_create_and_add("sensor_groups", opal_kobj);
181 pr_warn("Failed to create sensor group kobject\n");
185 for_each_child_of_node(sg, node) {
187 u32 sgid, len, nr_attrs, chipid;
189 ops = of_get_property(node, "ops", &len);
193 nr_attrs = get_nr_attrs(ops, len);
197 sgs[i].sgattrs = kcalloc(nr_attrs, sizeof(*sgs[i].sgattrs),
200 goto out_sgs_sgattrs;
202 sgs[i].sg.attrs = kcalloc(nr_attrs + 1,
203 sizeof(*sgs[i].sg.attrs),
206 if (!sgs[i].sg.attrs) {
207 kfree(sgs[i].sgattrs);
208 goto out_sgs_sgattrs;
211 if (of_property_read_u32(node, "sensor-group-id", &sgid)) {
212 pr_warn("sensor-group-id property not found\n");
213 goto out_sgs_sgattrs;
216 if (!of_property_read_u32(node, "ibm,chip-id", &chipid))
217 sprintf(sgs[i].name, "%s%d", node->name, chipid);
219 sprintf(sgs[i].name, "%s", node->name);
221 sgs[i].sg.name = sgs[i].name;
222 if (add_attr_group(ops, len, &sgs[i], sgid)) {
223 pr_warn("Failed to create sensor attribute group %s\n",
225 goto out_sgs_sgattrs;
234 kfree(sgs[i].sgattrs);
235 kfree(sgs[i].sg.attrs);
237 kobject_put(sg_kobj);