This source file includes following definitions.
- mdev_type_attr_show
- mdev_type_attr_store
- create_store
- mdev_type_release
- add_mdev_supported_type
- remove_mdev_supported_type
- add_mdev_supported_type_groups
- parent_remove_sysfs_files
- parent_create_sysfs_files
- remove_store
- mdev_create_sysfs_files
- mdev_remove_sysfs_files
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10 #include <linux/sysfs.h>
11 #include <linux/ctype.h>
12 #include <linux/device.h>
13 #include <linux/slab.h>
14 #include <linux/uuid.h>
15 #include <linux/mdev.h>
16
17 #include "mdev_private.h"
18
19
20
21 static ssize_t mdev_type_attr_show(struct kobject *kobj,
22 struct attribute *__attr, char *buf)
23 {
24 struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
25 struct mdev_type *type = to_mdev_type(kobj);
26 ssize_t ret = -EIO;
27
28 if (attr->show)
29 ret = attr->show(kobj, type->parent->dev, buf);
30 return ret;
31 }
32
33 static ssize_t mdev_type_attr_store(struct kobject *kobj,
34 struct attribute *__attr,
35 const char *buf, size_t count)
36 {
37 struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
38 struct mdev_type *type = to_mdev_type(kobj);
39 ssize_t ret = -EIO;
40
41 if (attr->store)
42 ret = attr->store(&type->kobj, type->parent->dev, buf, count);
43 return ret;
44 }
45
46 static const struct sysfs_ops mdev_type_sysfs_ops = {
47 .show = mdev_type_attr_show,
48 .store = mdev_type_attr_store,
49 };
50
51 static ssize_t create_store(struct kobject *kobj, struct device *dev,
52 const char *buf, size_t count)
53 {
54 char *str;
55 guid_t uuid;
56 int ret;
57
58 if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
59 return -EINVAL;
60
61 str = kstrndup(buf, count, GFP_KERNEL);
62 if (!str)
63 return -ENOMEM;
64
65 ret = guid_parse(str, &uuid);
66 kfree(str);
67 if (ret)
68 return ret;
69
70 ret = mdev_device_create(kobj, dev, &uuid);
71 if (ret)
72 return ret;
73
74 return count;
75 }
76
77 MDEV_TYPE_ATTR_WO(create);
78
79 static void mdev_type_release(struct kobject *kobj)
80 {
81 struct mdev_type *type = to_mdev_type(kobj);
82
83 pr_debug("Releasing group %s\n", kobj->name);
84 kfree(type);
85 }
86
87 static struct kobj_type mdev_type_ktype = {
88 .sysfs_ops = &mdev_type_sysfs_ops,
89 .release = mdev_type_release,
90 };
91
92 static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
93 struct attribute_group *group)
94 {
95 struct mdev_type *type;
96 int ret;
97
98 if (!group->name) {
99 pr_err("%s: Type name empty!\n", __func__);
100 return ERR_PTR(-EINVAL);
101 }
102
103 type = kzalloc(sizeof(*type), GFP_KERNEL);
104 if (!type)
105 return ERR_PTR(-ENOMEM);
106
107 type->kobj.kset = parent->mdev_types_kset;
108
109 ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
110 "%s-%s", dev_driver_string(parent->dev),
111 group->name);
112 if (ret) {
113 kfree(type);
114 return ERR_PTR(ret);
115 }
116
117 ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr);
118 if (ret)
119 goto attr_create_failed;
120
121 type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
122 if (!type->devices_kobj) {
123 ret = -ENOMEM;
124 goto attr_devices_failed;
125 }
126
127 ret = sysfs_create_files(&type->kobj,
128 (const struct attribute **)group->attrs);
129 if (ret) {
130 ret = -ENOMEM;
131 goto attrs_failed;
132 }
133
134 type->group = group;
135 type->parent = parent;
136 return type;
137
138 attrs_failed:
139 kobject_put(type->devices_kobj);
140 attr_devices_failed:
141 sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
142 attr_create_failed:
143 kobject_del(&type->kobj);
144 kobject_put(&type->kobj);
145 return ERR_PTR(ret);
146 }
147
148 static void remove_mdev_supported_type(struct mdev_type *type)
149 {
150 sysfs_remove_files(&type->kobj,
151 (const struct attribute **)type->group->attrs);
152 kobject_put(type->devices_kobj);
153 sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
154 kobject_del(&type->kobj);
155 kobject_put(&type->kobj);
156 }
157
158 static int add_mdev_supported_type_groups(struct mdev_parent *parent)
159 {
160 int i;
161
162 for (i = 0; parent->ops->supported_type_groups[i]; i++) {
163 struct mdev_type *type;
164
165 type = add_mdev_supported_type(parent,
166 parent->ops->supported_type_groups[i]);
167 if (IS_ERR(type)) {
168 struct mdev_type *ltype, *tmp;
169
170 list_for_each_entry_safe(ltype, tmp, &parent->type_list,
171 next) {
172 list_del(<ype->next);
173 remove_mdev_supported_type(ltype);
174 }
175 return PTR_ERR(type);
176 }
177 list_add(&type->next, &parent->type_list);
178 }
179 return 0;
180 }
181
182
183 void parent_remove_sysfs_files(struct mdev_parent *parent)
184 {
185 struct mdev_type *type, *tmp;
186
187 list_for_each_entry_safe(type, tmp, &parent->type_list, next) {
188 list_del(&type->next);
189 remove_mdev_supported_type(type);
190 }
191
192 sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups);
193 kset_unregister(parent->mdev_types_kset);
194 }
195
196 int parent_create_sysfs_files(struct mdev_parent *parent)
197 {
198 int ret;
199
200 parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
201 NULL, &parent->dev->kobj);
202
203 if (!parent->mdev_types_kset)
204 return -ENOMEM;
205
206 INIT_LIST_HEAD(&parent->type_list);
207
208 ret = sysfs_create_groups(&parent->dev->kobj,
209 parent->ops->dev_attr_groups);
210 if (ret)
211 goto create_err;
212
213 ret = add_mdev_supported_type_groups(parent);
214 if (ret)
215 sysfs_remove_groups(&parent->dev->kobj,
216 parent->ops->dev_attr_groups);
217 else
218 return ret;
219
220 create_err:
221 kset_unregister(parent->mdev_types_kset);
222 return ret;
223 }
224
225 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
226 const char *buf, size_t count)
227 {
228 unsigned long val;
229
230 if (kstrtoul(buf, 0, &val) < 0)
231 return -EINVAL;
232
233 if (val && device_remove_file_self(dev, attr)) {
234 int ret;
235
236 ret = mdev_device_remove(dev);
237 if (ret)
238 return ret;
239 }
240
241 return count;
242 }
243
244 static DEVICE_ATTR_WO(remove);
245
246 static const struct attribute *mdev_device_attrs[] = {
247 &dev_attr_remove.attr,
248 NULL,
249 };
250
251 int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
252 {
253 int ret;
254
255 ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
256 if (ret)
257 return ret;
258
259 ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
260 if (ret)
261 goto type_link_failed;
262
263 ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
264 if (ret)
265 goto create_files_failed;
266
267 return ret;
268
269 create_files_failed:
270 sysfs_remove_link(&dev->kobj, "mdev_type");
271 type_link_failed:
272 sysfs_remove_link(type->devices_kobj, dev_name(dev));
273 return ret;
274 }
275
276 void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
277 {
278 sysfs_remove_files(&dev->kobj, mdev_device_attrs);
279 sysfs_remove_link(&dev->kobj, "mdev_type");
280 sysfs_remove_link(type->devices_kobj, dev_name(dev));
281 }