1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * nvmem framework consumer.
4 *
5 * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
6 * Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
7 */
8
9 #ifndef _LINUX_NVMEM_CONSUMER_H
10 #define _LINUX_NVMEM_CONSUMER_H
11
12 #include <linux/err.h>
13 #include <linux/errno.h>
14 #include <linux/notifier.h>
15
16 struct device;
17 struct device_node;
18 /* consumer cookie */
19 struct nvmem_cell;
20 struct nvmem_device;
21 struct nvmem_cell_info;
22
23 /**
24 * struct nvmem_cell_lookup - cell lookup entry
25 *
26 * @nvmem_name: Name of the provider.
27 * @cell_name: Name of the nvmem cell as defined in the name field of
28 * struct nvmem_cell_info.
29 * @dev_id: Name of the consumer device that will be associated with
30 * this cell.
31 * @con_id: Connector id for this cell lookup.
32 */
33 struct nvmem_cell_lookup {
34 const char *nvmem_name;
35 const char *cell_name;
36 const char *dev_id;
37 const char *con_id;
38 struct list_head node;
39 };
40
41 enum {
42 NVMEM_ADD = 1,
43 NVMEM_REMOVE,
44 NVMEM_CELL_ADD,
45 NVMEM_CELL_REMOVE,
46 NVMEM_LAYOUT_ADD,
47 NVMEM_LAYOUT_REMOVE,
48 };
49
50 #if IS_ENABLED(CONFIG_NVMEM)
51
52 /* Cell based interface */
53 struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id);
54 struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *id);
55 void nvmem_cell_put(struct nvmem_cell *cell);
56 void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
57 void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
58 int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
59 int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);
60 int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val);
61 int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val);
62 int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val);
63 int nvmem_cell_read_variable_le_u32(struct device *dev, const char *cell_id,
64 u32 *val);
65 int nvmem_cell_read_variable_le_u64(struct device *dev, const char *cell_id,
66 u64 *val);
67
68 /* direct nvmem device read/write interface */
69 struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
70 struct nvmem_device *devm_nvmem_device_get(struct device *dev,
71 const char *name);
72 void nvmem_device_put(struct nvmem_device *nvmem);
73 void devm_nvmem_device_put(struct device *dev, struct nvmem_device *nvmem);
74 int nvmem_device_read(struct nvmem_device *nvmem, unsigned int offset,
75 size_t bytes, void *buf);
76 int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset,
77 size_t bytes, void *buf);
78 ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
79 struct nvmem_cell_info *info, void *buf);
80 int nvmem_device_cell_write(struct nvmem_device *nvmem,
81 struct nvmem_cell_info *info, void *buf);
82
83 const char *nvmem_dev_name(struct nvmem_device *nvmem);
84 size_t nvmem_dev_size(struct nvmem_device *nvmem);
85
86 void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries,
87 size_t nentries);
88 void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries,
89 size_t nentries);
90
91 int nvmem_register_notifier(struct notifier_block *nb);
92 int nvmem_unregister_notifier(struct notifier_block *nb);
93
94 struct nvmem_device *nvmem_device_find(void *data,
95 int (*match)(struct device *dev, const void *data));
96
97 #else
98
99 static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
100 const char *id)
101 {
102 return ERR_PTR(-EOPNOTSUPP);
103 }
104
105 static inline struct nvmem_cell *devm_nvmem_cell_get(struct device *dev,
106 const char *id)
107 {
108 return ERR_PTR(-EOPNOTSUPP);
109 }
110
111 static inline void devm_nvmem_cell_put(struct device *dev,
112 struct nvmem_cell *cell)
113 {
114
115 }
116 static inline void nvmem_cell_put(struct nvmem_cell *cell)
117 {
118 }
119
120 static inline void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
121 {
122 return ERR_PTR(-EOPNOTSUPP);
123 }
124
125 static inline int nvmem_cell_write(struct nvmem_cell *cell,
126 void *buf, size_t len)
127 {
128 return -EOPNOTSUPP;
129 }
130
131 static inline int nvmem_cell_read_u8(struct device *dev,
132 const char *cell_id, u8 *val)
133 {
134 return -EOPNOTSUPP;
135 }
136
137 static inline int nvmem_cell_read_u16(struct device *dev,
138 const char *cell_id, u16 *val)
139 {
140 return -EOPNOTSUPP;
141 }
142
143 static inline int nvmem_cell_read_u32(struct device *dev,
144 const char *cell_id, u32 *val)
145 {
146 return -EOPNOTSUPP;
147 }
148
149 static inline int nvmem_cell_read_u64(struct device *dev,
150 const char *cell_id, u64 *val)
151 {
152 return -EOPNOTSUPP;
153 }
154
155 static inline int nvmem_cell_read_variable_le_u32(struct device *dev,
156 const char *cell_id,
157 u32 *val)
158 {
159 return -EOPNOTSUPP;
160 }
161
162 static inline int nvmem_cell_read_variable_le_u64(struct device *dev,
163 const char *cell_id,
164 u64 *val)
165 {
166 return -EOPNOTSUPP;
167 }
168
169 static inline struct nvmem_device *nvmem_device_get(struct device *dev,
170 const char *name)
171 {
172 return ERR_PTR(-EOPNOTSUPP);
173 }
174
175 static inline struct nvmem_device *devm_nvmem_device_get(struct device *dev,
176 const char *name)
177 {
178 return ERR_PTR(-EOPNOTSUPP);
179 }
180
181 static inline void nvmem_device_put(struct nvmem_device *nvmem)
182 {
183 }
184
185 static inline void devm_nvmem_device_put(struct device *dev,
186 struct nvmem_device *nvmem)
187 {
188 }
189
190 static inline ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
191 struct nvmem_cell_info *info,
192 void *buf)
193 {
194 return -EOPNOTSUPP;
195 }
196
197 static inline int nvmem_device_cell_write(struct nvmem_device *nvmem,
198 struct nvmem_cell_info *info,
199 void *buf)
200 {
201 return -EOPNOTSUPP;
202 }
203
204 static inline int nvmem_device_read(struct nvmem_device *nvmem,
205 unsigned int offset, size_t bytes,
206 void *buf)
207 {
208 return -EOPNOTSUPP;
209 }
210
211 static inline int nvmem_device_write(struct nvmem_device *nvmem,
212 unsigned int offset, size_t bytes,
213 void *buf)
214 {
215 return -EOPNOTSUPP;
216 }
217
218 static inline const char *nvmem_dev_name(struct nvmem_device *nvmem)
219 {
220 return NULL;
221 }
222
223 static inline void
224 nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
225 static inline void
226 nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
227
228 static inline int nvmem_register_notifier(struct notifier_block *nb)
229 {
230 return -EOPNOTSUPP;
231 }
232
233 static inline int nvmem_unregister_notifier(struct notifier_block *nb)
234 {
235 return -EOPNOTSUPP;
236 }
237
238 static inline struct nvmem_device *nvmem_device_find(void *data,
239 int (*match)(struct device *dev, const void *data))
240 {
241 return NULL;
242 }
243
244 #endif /* CONFIG_NVMEM */
245
246 #if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
247 struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
248 const char *id);
249 struct nvmem_device *of_nvmem_device_get(struct device_node *np,
250 const char *name);
251 #else
252 static inline struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
253 const char *id)
254 {
255 return ERR_PTR(-EOPNOTSUPP);
256 }
257
258 static inline struct nvmem_device *of_nvmem_device_get(struct device_node *np,
259 const char *name)
260 {
261 return ERR_PTR(-EOPNOTSUPP);
262 }
263 #endif /* CONFIG_NVMEM && CONFIG_OF */
264
265 #endif /* ifndef _LINUX_NVMEM_CONSUMER_H */
266
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