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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) ST-Ericsson SA 2011
4 *
5 * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
6 */
7
8#include <linux/sysfs.h>
9#include <linux/init.h>
10#include <linux/stat.h>
11#include <linux/slab.h>
12#include <linux/idr.h>
13#include <linux/spinlock.h>
14#include <linux/sys_soc.h>
15#include <linux/err.h>
16#include <linux/glob.h>
17
18static DEFINE_IDA(soc_ida);
19
20/* Prototype to allow declarations of DEVICE_ATTR(<foo>) before soc_info_show */
21static ssize_t soc_info_show(struct device *dev, struct device_attribute *attr,
22 char *buf);
23
24struct soc_device {
25 struct device dev;
26 struct soc_device_attribute *attr;
27 int soc_dev_num;
28};
29
30static struct bus_type soc_bus_type = {
31 .name = "soc",
32};
33
34static DEVICE_ATTR(machine, 0444, soc_info_show, NULL);
35static DEVICE_ATTR(family, 0444, soc_info_show, NULL);
36static DEVICE_ATTR(serial_number, 0444, soc_info_show, NULL);
37static DEVICE_ATTR(soc_id, 0444, soc_info_show, NULL);
38static DEVICE_ATTR(revision, 0444, soc_info_show, NULL);
39
40struct device *soc_device_to_device(struct soc_device *soc_dev)
41{
42 return &soc_dev->dev;
43}
44
45static umode_t soc_attribute_mode(struct kobject *kobj,
46 struct attribute *attr,
47 int index)
48{
49 struct device *dev = kobj_to_dev(kobj);
50 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
51
52 if ((attr == &dev_attr_machine.attr) && soc_dev->attr->machine)
53 return attr->mode;
54 if ((attr == &dev_attr_family.attr) && soc_dev->attr->family)
55 return attr->mode;
56 if ((attr == &dev_attr_revision.attr) && soc_dev->attr->revision)
57 return attr->mode;
58 if ((attr == &dev_attr_serial_number.attr) && soc_dev->attr->serial_number)
59 return attr->mode;
60 if ((attr == &dev_attr_soc_id.attr) && soc_dev->attr->soc_id)
61 return attr->mode;
62
63 /* Unknown or unfilled attribute */
64 return 0;
65}
66
67static ssize_t soc_info_show(struct device *dev, struct device_attribute *attr,
68 char *buf)
69{
70 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
71 const char *output;
72
73 if (attr == &dev_attr_machine)
74 output = soc_dev->attr->machine;
75 else if (attr == &dev_attr_family)
76 output = soc_dev->attr->family;
77 else if (attr == &dev_attr_revision)
78 output = soc_dev->attr->revision;
79 else if (attr == &dev_attr_serial_number)
80 output = soc_dev->attr->serial_number;
81 else if (attr == &dev_attr_soc_id)
82 output = soc_dev->attr->soc_id;
83 else
84 return -EINVAL;
85
86 return sysfs_emit(buf, "%s\n", output);
87}
88
89static struct attribute *soc_attr[] = {
90 &dev_attr_machine.attr,
91 &dev_attr_family.attr,
92 &dev_attr_serial_number.attr,
93 &dev_attr_soc_id.attr,
94 &dev_attr_revision.attr,
95 NULL,
96};
97
98static const struct attribute_group soc_attr_group = {
99 .attrs = soc_attr,
100 .is_visible = soc_attribute_mode,
101};
102
103static void soc_release(struct device *dev)
104{
105 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
106
107 ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
108 kfree(soc_dev->dev.groups);
109 kfree(soc_dev);
110}
111
112static struct soc_device_attribute *early_soc_dev_attr;
113
114struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
115{
116 struct soc_device *soc_dev;
117 const struct attribute_group **soc_attr_groups;
118 int ret;
119
120 if (!soc_bus_type.p) {
121 if (early_soc_dev_attr)
122 return ERR_PTR(-EBUSY);
123 early_soc_dev_attr = soc_dev_attr;
124 return NULL;
125 }
126
127 soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
128 if (!soc_dev) {
129 ret = -ENOMEM;
130 goto out1;
131 }
132
133 soc_attr_groups = kcalloc(3, sizeof(*soc_attr_groups), GFP_KERNEL);
134 if (!soc_attr_groups) {
135 ret = -ENOMEM;
136 goto out2;
137 }
138 soc_attr_groups[0] = &soc_attr_group;
139 soc_attr_groups[1] = soc_dev_attr->custom_attr_group;
140
141 /* Fetch a unique (reclaimable) SOC ID. */
142 ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
143 if (ret < 0)
144 goto out3;
145 soc_dev->soc_dev_num = ret;
146
147 soc_dev->attr = soc_dev_attr;
148 soc_dev->dev.bus = &soc_bus_type;
149 soc_dev->dev.groups = soc_attr_groups;
150 soc_dev->dev.release = soc_release;
151
152 dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
153
154 ret = device_register(&soc_dev->dev);
155 if (ret) {
156 put_device(&soc_dev->dev);
157 return ERR_PTR(ret);
158 }
159
160 return soc_dev;
161
162out3:
163 kfree(soc_attr_groups);
164out2:
165 kfree(soc_dev);
166out1:
167 return ERR_PTR(ret);
168}
169EXPORT_SYMBOL_GPL(soc_device_register);
170
171/* Ensure soc_dev->attr is freed after calling soc_device_unregister. */
172void soc_device_unregister(struct soc_device *soc_dev)
173{
174 device_unregister(&soc_dev->dev);
175 early_soc_dev_attr = NULL;
176}
177EXPORT_SYMBOL_GPL(soc_device_unregister);
178
179static int __init soc_bus_register(void)
180{
181 int ret;
182
183 ret = bus_register(&soc_bus_type);
184 if (ret)
185 return ret;
186
187 if (early_soc_dev_attr)
188 return PTR_ERR(soc_device_register(early_soc_dev_attr));
189
190 return 0;
191}
192core_initcall(soc_bus_register);
193
194static int soc_device_match_attr(const struct soc_device_attribute *attr,
195 const struct soc_device_attribute *match)
196{
197 if (match->machine &&
198 (!attr->machine || !glob_match(match->machine, attr->machine)))
199 return 0;
200
201 if (match->family &&
202 (!attr->family || !glob_match(match->family, attr->family)))
203 return 0;
204
205 if (match->revision &&
206 (!attr->revision || !glob_match(match->revision, attr->revision)))
207 return 0;
208
209 if (match->soc_id &&
210 (!attr->soc_id || !glob_match(match->soc_id, attr->soc_id)))
211 return 0;
212
213 return 1;
214}
215
216static int soc_device_match_one(struct device *dev, void *arg)
217{
218 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
219
220 return soc_device_match_attr(soc_dev->attr, arg);
221}
222
223/*
224 * soc_device_match - identify the SoC in the machine
225 * @matches: zero-terminated array of possible matches
226 *
227 * returns the first matching entry of the argument array, or NULL
228 * if none of them match.
229 *
230 * This function is meant as a helper in place of of_match_node()
231 * in cases where either no device tree is available or the information
232 * in a device node is insufficient to identify a particular variant
233 * by its compatible strings or other properties. For new devices,
234 * the DT binding should always provide unique compatible strings
235 * that allow the use of of_match_node() instead.
236 *
237 * The calling function can use the .data entry of the
238 * soc_device_attribute to pass a structure or function pointer for
239 * each entry.
240 */
241const struct soc_device_attribute *soc_device_match(
242 const struct soc_device_attribute *matches)
243{
244 int ret;
245
246 if (!matches)
247 return NULL;
248
249 while (matches->machine || matches->family || matches->revision ||
250 matches->soc_id) {
251 ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches,
252 soc_device_match_one);
253 if (ret < 0 && early_soc_dev_attr)
254 ret = soc_device_match_attr(early_soc_dev_attr,
255 matches);
256 if (ret < 0)
257 return NULL;
258 if (ret)
259 return matches;
260
261 matches++;
262 }
263 return NULL;
264}
265EXPORT_SYMBOL_GPL(soc_device_match);
1/*
2 * Copyright (C) ST-Ericsson SA 2011
3 *
4 * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
5 * License terms: GNU General Public License (GPL), version 2
6 */
7
8#include <linux/sysfs.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/stat.h>
12#include <linux/slab.h>
13#include <linux/idr.h>
14#include <linux/spinlock.h>
15#include <linux/sys_soc.h>
16#include <linux/err.h>
17
18static DEFINE_IDA(soc_ida);
19
20static ssize_t soc_info_get(struct device *dev,
21 struct device_attribute *attr,
22 char *buf);
23
24struct soc_device {
25 struct device dev;
26 struct soc_device_attribute *attr;
27 int soc_dev_num;
28};
29
30static struct bus_type soc_bus_type = {
31 .name = "soc",
32};
33
34static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL);
35static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL);
36static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL);
37static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL);
38
39struct device *soc_device_to_device(struct soc_device *soc_dev)
40{
41 return &soc_dev->dev;
42}
43
44static umode_t soc_attribute_mode(struct kobject *kobj,
45 struct attribute *attr,
46 int index)
47{
48 struct device *dev = container_of(kobj, struct device, kobj);
49 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
50
51 if ((attr == &dev_attr_machine.attr)
52 && (soc_dev->attr->machine != NULL))
53 return attr->mode;
54 if ((attr == &dev_attr_family.attr)
55 && (soc_dev->attr->family != NULL))
56 return attr->mode;
57 if ((attr == &dev_attr_revision.attr)
58 && (soc_dev->attr->revision != NULL))
59 return attr->mode;
60 if ((attr == &dev_attr_soc_id.attr)
61 && (soc_dev->attr->soc_id != NULL))
62 return attr->mode;
63
64 /* Unknown or unfilled attribute. */
65 return 0;
66}
67
68static ssize_t soc_info_get(struct device *dev,
69 struct device_attribute *attr,
70 char *buf)
71{
72 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
73
74 if (attr == &dev_attr_machine)
75 return sprintf(buf, "%s\n", soc_dev->attr->machine);
76 if (attr == &dev_attr_family)
77 return sprintf(buf, "%s\n", soc_dev->attr->family);
78 if (attr == &dev_attr_revision)
79 return sprintf(buf, "%s\n", soc_dev->attr->revision);
80 if (attr == &dev_attr_soc_id)
81 return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
82
83 return -EINVAL;
84
85}
86
87static struct attribute *soc_attr[] = {
88 &dev_attr_machine.attr,
89 &dev_attr_family.attr,
90 &dev_attr_soc_id.attr,
91 &dev_attr_revision.attr,
92 NULL,
93};
94
95static const struct attribute_group soc_attr_group = {
96 .attrs = soc_attr,
97 .is_visible = soc_attribute_mode,
98};
99
100static const struct attribute_group *soc_attr_groups[] = {
101 &soc_attr_group,
102 NULL,
103};
104
105static void soc_release(struct device *dev)
106{
107 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
108
109 kfree(soc_dev);
110}
111
112struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
113{
114 struct soc_device *soc_dev;
115 int ret;
116
117 soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
118 if (!soc_dev) {
119 ret = -ENOMEM;
120 goto out1;
121 }
122
123 /* Fetch a unique (reclaimable) SOC ID. */
124 ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
125 if (ret < 0)
126 goto out2;
127 soc_dev->soc_dev_num = ret;
128
129 soc_dev->attr = soc_dev_attr;
130 soc_dev->dev.bus = &soc_bus_type;
131 soc_dev->dev.groups = soc_attr_groups;
132 soc_dev->dev.release = soc_release;
133
134 dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
135
136 ret = device_register(&soc_dev->dev);
137 if (ret)
138 goto out3;
139
140 return soc_dev;
141
142out3:
143 ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
144out2:
145 kfree(soc_dev);
146out1:
147 return ERR_PTR(ret);
148}
149
150/* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
151void soc_device_unregister(struct soc_device *soc_dev)
152{
153 ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
154
155 device_unregister(&soc_dev->dev);
156}
157
158static int __init soc_bus_register(void)
159{
160 return bus_register(&soc_bus_type);
161}
162core_initcall(soc_bus_register);
163
164static void __exit soc_bus_unregister(void)
165{
166 ida_destroy(&soc_ida);
167
168 bus_unregister(&soc_bus_type);
169}
170module_exit(soc_bus_unregister);