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989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
74d1d82c LJ |
2 | /* |
3 | * Copyright (C) ST-Ericsson SA 2011 | |
4 | * | |
5 | * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson. | |
74d1d82c LJ |
6 | */ |
7 | ||
8 | #include <linux/sysfs.h> | |
74d1d82c LJ |
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> | |
c97db7cc | 16 | #include <linux/glob.h> |
74d1d82c | 17 | |
3a4ffe93 | 18 | static DEFINE_IDA(soc_ida); |
74d1d82c LJ |
19 | |
20 | static ssize_t soc_info_get(struct device *dev, | |
21 | struct device_attribute *attr, | |
22 | char *buf); | |
23 | ||
24 | struct soc_device { | |
25 | struct device dev; | |
26 | struct soc_device_attribute *attr; | |
27 | int soc_dev_num; | |
28 | }; | |
29 | ||
30 | static struct bus_type soc_bus_type = { | |
31 | .name = "soc", | |
32 | }; | |
33 | ||
34 | static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL); | |
35 | static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL); | |
9aebf4de | 36 | static DEVICE_ATTR(serial_number, S_IRUGO, soc_info_get, NULL); |
74d1d82c LJ |
37 | static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL); |
38 | static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL); | |
39 | ||
40 | struct device *soc_device_to_device(struct soc_device *soc_dev) | |
41 | { | |
42 | return &soc_dev->dev; | |
43 | } | |
44 | ||
726592a9 | 45 | static umode_t soc_attribute_mode(struct kobject *kobj, |
2071b950 LT |
46 | struct attribute *attr, |
47 | int index) | |
74d1d82c LJ |
48 | { |
49 | struct device *dev = container_of(kobj, struct device, kobj); | |
50 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); | |
51 | ||
52 | if ((attr == &dev_attr_machine.attr) | |
53 | && (soc_dev->attr->machine != NULL)) | |
54 | return attr->mode; | |
55 | if ((attr == &dev_attr_family.attr) | |
56 | && (soc_dev->attr->family != NULL)) | |
57 | return attr->mode; | |
58 | if ((attr == &dev_attr_revision.attr) | |
59 | && (soc_dev->attr->revision != NULL)) | |
60 | return attr->mode; | |
9aebf4de BA |
61 | if ((attr == &dev_attr_serial_number.attr) |
62 | && (soc_dev->attr->serial_number != NULL)) | |
63 | return attr->mode; | |
74d1d82c LJ |
64 | if ((attr == &dev_attr_soc_id.attr) |
65 | && (soc_dev->attr->soc_id != NULL)) | |
2071b950 | 66 | return attr->mode; |
74d1d82c LJ |
67 | |
68 | /* Unknown or unfilled attribute. */ | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static ssize_t soc_info_get(struct device *dev, | |
73 | struct device_attribute *attr, | |
74 | char *buf) | |
75 | { | |
76 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); | |
77 | ||
78 | if (attr == &dev_attr_machine) | |
79 | return sprintf(buf, "%s\n", soc_dev->attr->machine); | |
80 | if (attr == &dev_attr_family) | |
81 | return sprintf(buf, "%s\n", soc_dev->attr->family); | |
82 | if (attr == &dev_attr_revision) | |
83 | return sprintf(buf, "%s\n", soc_dev->attr->revision); | |
9aebf4de BA |
84 | if (attr == &dev_attr_serial_number) |
85 | return sprintf(buf, "%s\n", soc_dev->attr->serial_number); | |
74d1d82c LJ |
86 | if (attr == &dev_attr_soc_id) |
87 | return sprintf(buf, "%s\n", soc_dev->attr->soc_id); | |
88 | ||
89 | return -EINVAL; | |
90 | ||
91 | } | |
92 | ||
93 | static struct attribute *soc_attr[] = { | |
94 | &dev_attr_machine.attr, | |
95 | &dev_attr_family.attr, | |
9aebf4de | 96 | &dev_attr_serial_number.attr, |
74d1d82c LJ |
97 | &dev_attr_soc_id.attr, |
98 | &dev_attr_revision.attr, | |
99 | NULL, | |
100 | }; | |
101 | ||
102 | static const struct attribute_group soc_attr_group = { | |
103 | .attrs = soc_attr, | |
104 | .is_visible = soc_attribute_mode, | |
105 | }; | |
106 | ||
74d1d82c LJ |
107 | static void soc_release(struct device *dev) |
108 | { | |
109 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); | |
110 | ||
c31e7312 MN |
111 | ida_simple_remove(&soc_ida, soc_dev->soc_dev_num); |
112 | kfree(soc_dev->dev.groups); | |
74d1d82c LJ |
113 | kfree(soc_dev); |
114 | } | |
115 | ||
6e12db37 GU |
116 | static struct soc_device_attribute *early_soc_dev_attr; |
117 | ||
74d1d82c LJ |
118 | struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr) |
119 | { | |
120 | struct soc_device *soc_dev; | |
c31e7312 | 121 | const struct attribute_group **soc_attr_groups; |
74d1d82c LJ |
122 | int ret; |
123 | ||
1da1b362 | 124 | if (!soc_bus_type.p) { |
6e12db37 GU |
125 | if (early_soc_dev_attr) |
126 | return ERR_PTR(-EBUSY); | |
127 | early_soc_dev_attr = soc_dev_attr; | |
128 | return NULL; | |
1da1b362 GU |
129 | } |
130 | ||
74d1d82c LJ |
131 | soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL); |
132 | if (!soc_dev) { | |
2071b950 | 133 | ret = -ENOMEM; |
74d1d82c LJ |
134 | goto out1; |
135 | } | |
136 | ||
c31e7312 MN |
137 | soc_attr_groups = kcalloc(3, sizeof(*soc_attr_groups), GFP_KERNEL); |
138 | if (!soc_attr_groups) { | |
139 | ret = -ENOMEM; | |
140 | goto out2; | |
141 | } | |
142 | soc_attr_groups[0] = &soc_attr_group; | |
143 | soc_attr_groups[1] = soc_dev_attr->custom_attr_group; | |
144 | ||
74d1d82c | 145 | /* Fetch a unique (reclaimable) SOC ID. */ |
cfcf6a91 LD |
146 | ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL); |
147 | if (ret < 0) | |
c31e7312 | 148 | goto out3; |
cfcf6a91 | 149 | soc_dev->soc_dev_num = ret; |
74d1d82c LJ |
150 | |
151 | soc_dev->attr = soc_dev_attr; | |
152 | soc_dev->dev.bus = &soc_bus_type; | |
153 | soc_dev->dev.groups = soc_attr_groups; | |
154 | soc_dev->dev.release = soc_release; | |
155 | ||
156 | dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num); | |
157 | ||
158 | ret = device_register(&soc_dev->dev); | |
c31e7312 MN |
159 | if (ret) { |
160 | put_device(&soc_dev->dev); | |
161 | return ERR_PTR(ret); | |
162 | } | |
74d1d82c LJ |
163 | |
164 | return soc_dev; | |
165 | ||
166 | out3: | |
c31e7312 | 167 | kfree(soc_attr_groups); |
74d1d82c LJ |
168 | out2: |
169 | kfree(soc_dev); | |
170 | out1: | |
171 | return ERR_PTR(ret); | |
172 | } | |
f7ccc7a3 | 173 | EXPORT_SYMBOL_GPL(soc_device_register); |
74d1d82c LJ |
174 | |
175 | /* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */ | |
176 | void soc_device_unregister(struct soc_device *soc_dev) | |
177 | { | |
74d1d82c | 178 | device_unregister(&soc_dev->dev); |
6e12db37 | 179 | early_soc_dev_attr = NULL; |
74d1d82c | 180 | } |
f7ccc7a3 | 181 | EXPORT_SYMBOL_GPL(soc_device_unregister); |
74d1d82c LJ |
182 | |
183 | static int __init soc_bus_register(void) | |
184 | { | |
6e12db37 | 185 | int ret; |
1da1b362 | 186 | |
6e12db37 GU |
187 | ret = bus_register(&soc_bus_type); |
188 | if (ret) | |
189 | return ret; | |
190 | ||
191 | if (early_soc_dev_attr) | |
192 | return PTR_ERR(soc_device_register(early_soc_dev_attr)); | |
193 | ||
194 | return 0; | |
74d1d82c LJ |
195 | } |
196 | core_initcall(soc_bus_register); | |
c97db7cc | 197 | |
6e12db37 GU |
198 | static int soc_device_match_attr(const struct soc_device_attribute *attr, |
199 | const struct soc_device_attribute *match) | |
c97db7cc | 200 | { |
c97db7cc | 201 | if (match->machine && |
6e12db37 | 202 | (!attr->machine || !glob_match(match->machine, attr->machine))) |
c97db7cc AB |
203 | return 0; |
204 | ||
205 | if (match->family && | |
6e12db37 | 206 | (!attr->family || !glob_match(match->family, attr->family))) |
c97db7cc AB |
207 | return 0; |
208 | ||
209 | if (match->revision && | |
6e12db37 | 210 | (!attr->revision || !glob_match(match->revision, attr->revision))) |
c97db7cc AB |
211 | return 0; |
212 | ||
213 | if (match->soc_id && | |
6e12db37 | 214 | (!attr->soc_id || !glob_match(match->soc_id, attr->soc_id))) |
c97db7cc AB |
215 | return 0; |
216 | ||
217 | return 1; | |
218 | } | |
219 | ||
6e12db37 GU |
220 | static int soc_device_match_one(struct device *dev, void *arg) |
221 | { | |
222 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); | |
223 | ||
224 | return soc_device_match_attr(soc_dev->attr, arg); | |
225 | } | |
226 | ||
c97db7cc AB |
227 | /* |
228 | * soc_device_match - identify the SoC in the machine | |
229 | * @matches: zero-terminated array of possible matches | |
230 | * | |
231 | * returns the first matching entry of the argument array, or NULL | |
232 | * if none of them match. | |
233 | * | |
234 | * This function is meant as a helper in place of of_match_node() | |
235 | * in cases where either no device tree is available or the information | |
236 | * in a device node is insufficient to identify a particular variant | |
237 | * by its compatible strings or other properties. For new devices, | |
238 | * the DT binding should always provide unique compatible strings | |
239 | * that allow the use of of_match_node() instead. | |
240 | * | |
241 | * The calling function can use the .data entry of the | |
242 | * soc_device_attribute to pass a structure or function pointer for | |
243 | * each entry. | |
244 | */ | |
245 | const struct soc_device_attribute *soc_device_match( | |
246 | const struct soc_device_attribute *matches) | |
247 | { | |
248 | int ret = 0; | |
249 | ||
250 | if (!matches) | |
251 | return NULL; | |
252 | ||
253 | while (!ret) { | |
254 | if (!(matches->machine || matches->family || | |
255 | matches->revision || matches->soc_id)) | |
256 | break; | |
257 | ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches, | |
258 | soc_device_match_one); | |
6e12db37 GU |
259 | if (ret < 0 && early_soc_dev_attr) |
260 | ret = soc_device_match_attr(early_soc_dev_attr, | |
261 | matches); | |
0656db9e GU |
262 | if (ret < 0) |
263 | return NULL; | |
c97db7cc AB |
264 | if (!ret) |
265 | matches++; | |
266 | else | |
267 | return matches; | |
268 | } | |
269 | return NULL; | |
270 | } | |
271 | EXPORT_SYMBOL_GPL(soc_device_match); |