1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * PowerNV OPAL Sensor-groups interface
4 *
5 * Copyright 2017 IBM Corp.
6 */
7
8 #define pr_fmt(fmt) "opal-sensor-groups: " fmt
9
10 #include <linux/of.h>
11 #include <linux/kobject.h>
12 #include <linux/slab.h>
13
14 #include <asm/opal.h>
15
16 static DEFINE_MUTEX(sg_mutex);
17
18 static struct kobject *sg_kobj;
19
20 struct sg_attr {
21 u32 handle;
22 struct kobj_attribute attr;
23 };
24
25 static struct sensor_group {
26 char name[20];
27 struct attribute_group sg;
28 struct sg_attr *sgattrs;
29 } *sgs;
30
sensor_group_enable(u32 handle,bool enable)31 int sensor_group_enable(u32 handle, bool enable)
32 {
33 struct opal_msg msg;
34 int token, ret;
35
36 token = opal_async_get_token_interruptible();
37 if (token < 0)
38 return token;
39
40 ret = opal_sensor_group_enable(handle, token, enable);
41 if (ret == OPAL_ASYNC_COMPLETION) {
42 ret = opal_async_wait_response(token, &msg);
43 if (ret) {
44 pr_devel("Failed to wait for the async response\n");
45 ret = -EIO;
46 goto out;
47 }
48 ret = opal_error_code(opal_get_async_rc(msg));
49 } else {
50 ret = opal_error_code(ret);
51 }
52
53 out:
54 opal_async_release_token(token);
55 return ret;
56 }
57 EXPORT_SYMBOL_GPL(sensor_group_enable);
58
sg_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t count)59 static ssize_t sg_store(struct kobject *kobj, struct kobj_attribute *attr,
60 const char *buf, size_t count)
61 {
62 struct sg_attr *sattr = container_of(attr, struct sg_attr, attr);
63 struct opal_msg msg;
64 u32 data;
65 int ret, token;
66
67 ret = kstrtoint(buf, 0, &data);
68 if (ret)
69 return ret;
70
71 if (data != 1)
72 return -EINVAL;
73
74 token = opal_async_get_token_interruptible();
75 if (token < 0) {
76 pr_devel("Failed to get token\n");
77 return token;
78 }
79
80 ret = mutex_lock_interruptible(&sg_mutex);
81 if (ret)
82 goto out_token;
83
84 ret = opal_sensor_group_clear(sattr->handle, token);
85 switch (ret) {
86 case OPAL_ASYNC_COMPLETION:
87 ret = opal_async_wait_response(token, &msg);
88 if (ret) {
89 pr_devel("Failed to wait for the async response\n");
90 ret = -EIO;
91 goto out;
92 }
93 ret = opal_error_code(opal_get_async_rc(msg));
94 if (!ret)
95 ret = count;
96 break;
97 case OPAL_SUCCESS:
98 ret = count;
99 break;
100 default:
101 ret = opal_error_code(ret);
102 }
103
104 out:
105 mutex_unlock(&sg_mutex);
106 out_token:
107 opal_async_release_token(token);
108 return ret;
109 }
110
111 static struct sg_ops_info {
112 int opal_no;
113 const char *attr_name;
114 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
115 const char *buf, size_t count);
116 } ops_info[] = {
117 { OPAL_SENSOR_GROUP_CLEAR, "clear", sg_store },
118 };
119
add_attr(int handle,struct sg_attr * attr,int index)120 static void add_attr(int handle, struct sg_attr *attr, int index)
121 {
122 attr->handle = handle;
123 sysfs_attr_init(&attr->attr.attr);
124 attr->attr.attr.name = ops_info[index].attr_name;
125 attr->attr.attr.mode = 0220;
126 attr->attr.store = ops_info[index].store;
127 }
128
add_attr_group(const __be32 * ops,int len,struct sensor_group * sg,u32 handle)129 static int add_attr_group(const __be32 *ops, int len, struct sensor_group *sg,
130 u32 handle)
131 {
132 int i, j;
133 int count = 0;
134
135 for (i = 0; i < len; i++)
136 for (j = 0; j < ARRAY_SIZE(ops_info); j++)
137 if (be32_to_cpu(ops[i]) == ops_info[j].opal_no) {
138 add_attr(handle, &sg->sgattrs[count], j);
139 sg->sg.attrs[count] =
140 &sg->sgattrs[count].attr.attr;
141 count++;
142 }
143
144 return sysfs_create_group(sg_kobj, &sg->sg);
145 }
146
get_nr_attrs(const __be32 * ops,int len)147 static int get_nr_attrs(const __be32 *ops, int len)
148 {
149 int i, j;
150 int nr_attrs = 0;
151
152 for (i = 0; i < len; i++)
153 for (j = 0; j < ARRAY_SIZE(ops_info); j++)
154 if (be32_to_cpu(ops[i]) == ops_info[j].opal_no)
155 nr_attrs++;
156
157 return nr_attrs;
158 }
159
opal_sensor_groups_init(void)160 void __init opal_sensor_groups_init(void)
161 {
162 struct device_node *sg, *node;
163 int i = 0;
164
165 sg = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
166 if (!sg) {
167 pr_devel("Sensor groups node not found\n");
168 return;
169 }
170
171 sgs = kcalloc(of_get_child_count(sg), sizeof(*sgs), GFP_KERNEL);
172 if (!sgs)
173 return;
174
175 sg_kobj = kobject_create_and_add("sensor_groups", opal_kobj);
176 if (!sg_kobj) {
177 pr_warn("Failed to create sensor group kobject\n");
178 goto out_sgs;
179 }
180
181 for_each_child_of_node(sg, node) {
182 const __be32 *ops;
183 u32 sgid, len, nr_attrs, chipid;
184
185 ops = of_get_property(node, "ops", &len);
186 if (!ops)
187 continue;
188
189 nr_attrs = get_nr_attrs(ops, len);
190 if (!nr_attrs)
191 continue;
192
193 sgs[i].sgattrs = kcalloc(nr_attrs, sizeof(*sgs[i].sgattrs),
194 GFP_KERNEL);
195 if (!sgs[i].sgattrs)
196 goto out_sgs_sgattrs;
197
198 sgs[i].sg.attrs = kcalloc(nr_attrs + 1,
199 sizeof(*sgs[i].sg.attrs),
200 GFP_KERNEL);
201
202 if (!sgs[i].sg.attrs) {
203 kfree(sgs[i].sgattrs);
204 goto out_sgs_sgattrs;
205 }
206
207 if (of_property_read_u32(node, "sensor-group-id", &sgid)) {
208 pr_warn("sensor-group-id property not found\n");
209 goto out_sgs_sgattrs;
210 }
211
212 if (!of_property_read_u32(node, "ibm,chip-id", &chipid))
213 sprintf(sgs[i].name, "%pOFn%d", node, chipid);
214 else
215 sprintf(sgs[i].name, "%pOFn", node);
216
217 sgs[i].sg.name = sgs[i].name;
218 if (add_attr_group(ops, len, &sgs[i], sgid)) {
219 pr_warn("Failed to create sensor attribute group %s\n",
220 sgs[i].sg.name);
221 goto out_sgs_sgattrs;
222 }
223 i++;
224 }
225
226 return;
227
228 out_sgs_sgattrs:
229 while (--i >= 0) {
230 kfree(sgs[i].sgattrs);
231 kfree(sgs[i].sg.attrs);
232 }
233 kobject_put(sg_kobj);
234 out_sgs:
235 kfree(sgs);
236 }
237