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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
16struct device;
17struct device_node;
18/* consumer cookie */
19struct nvmem_cell;
20struct nvmem_device;
21struct 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 */
33struct 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
41enum {
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 */
53struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id);
54struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *id);
55void nvmem_cell_put(struct nvmem_cell *cell);
56void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
57void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
58int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
59int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);
60int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val);
61int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val);
62int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val);
63int nvmem_cell_read_variable_le_u32(struct device *dev, const char *cell_id,
64 u32 *val);
65int nvmem_cell_read_variable_le_u64(struct device *dev, const char *cell_id,
66 u64 *val);
67
68/* direct nvmem device read/write interface */
69struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
70struct nvmem_device *devm_nvmem_device_get(struct device *dev,
71 const char *name);
72void nvmem_device_put(struct nvmem_device *nvmem);
73void devm_nvmem_device_put(struct device *dev, struct nvmem_device *nvmem);
74int nvmem_device_read(struct nvmem_device *nvmem, unsigned int offset,
75 size_t bytes, void *buf);
76int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset,
77 size_t bytes, void *buf);
78ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
79 struct nvmem_cell_info *info, void *buf);
80int nvmem_device_cell_write(struct nvmem_device *nvmem,
81 struct nvmem_cell_info *info, void *buf);
82
83const char *nvmem_dev_name(struct nvmem_device *nvmem);
84
85void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries,
86 size_t nentries);
87void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries,
88 size_t nentries);
89
90int nvmem_register_notifier(struct notifier_block *nb);
91int nvmem_unregister_notifier(struct notifier_block *nb);
92
93struct nvmem_device *nvmem_device_find(void *data,
94 int (*match)(struct device *dev, const void *data));
95
96#else
97
98static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
99 const char *id)
100{
101 return ERR_PTR(-EOPNOTSUPP);
102}
103
104static inline struct nvmem_cell *devm_nvmem_cell_get(struct device *dev,
105 const char *id)
106{
107 return ERR_PTR(-EOPNOTSUPP);
108}
109
110static inline void devm_nvmem_cell_put(struct device *dev,
111 struct nvmem_cell *cell)
112{
113
114}
115static inline void nvmem_cell_put(struct nvmem_cell *cell)
116{
117}
118
119static inline void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
120{
121 return ERR_PTR(-EOPNOTSUPP);
122}
123
124static inline int nvmem_cell_write(struct nvmem_cell *cell,
125 void *buf, size_t len)
126{
127 return -EOPNOTSUPP;
128}
129
130static inline int nvmem_cell_read_u8(struct device *dev,
131 const char *cell_id, u8 *val)
132{
133 return -EOPNOTSUPP;
134}
135
136static inline int nvmem_cell_read_u16(struct device *dev,
137 const char *cell_id, u16 *val)
138{
139 return -EOPNOTSUPP;
140}
141
142static inline int nvmem_cell_read_u32(struct device *dev,
143 const char *cell_id, u32 *val)
144{
145 return -EOPNOTSUPP;
146}
147
148static inline int nvmem_cell_read_u64(struct device *dev,
149 const char *cell_id, u64 *val)
150{
151 return -EOPNOTSUPP;
152}
153
154static inline int nvmem_cell_read_variable_le_u32(struct device *dev,
155 const char *cell_id,
156 u32 *val)
157{
158 return -EOPNOTSUPP;
159}
160
161static inline int nvmem_cell_read_variable_le_u64(struct device *dev,
162 const char *cell_id,
163 u64 *val)
164{
165 return -EOPNOTSUPP;
166}
167
168static inline struct nvmem_device *nvmem_device_get(struct device *dev,
169 const char *name)
170{
171 return ERR_PTR(-EOPNOTSUPP);
172}
173
174static inline struct nvmem_device *devm_nvmem_device_get(struct device *dev,
175 const char *name)
176{
177 return ERR_PTR(-EOPNOTSUPP);
178}
179
180static inline void nvmem_device_put(struct nvmem_device *nvmem)
181{
182}
183
184static inline void devm_nvmem_device_put(struct device *dev,
185 struct nvmem_device *nvmem)
186{
187}
188
189static inline ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
190 struct nvmem_cell_info *info,
191 void *buf)
192{
193 return -EOPNOTSUPP;
194}
195
196static inline int nvmem_device_cell_write(struct nvmem_device *nvmem,
197 struct nvmem_cell_info *info,
198 void *buf)
199{
200 return -EOPNOTSUPP;
201}
202
203static inline int nvmem_device_read(struct nvmem_device *nvmem,
204 unsigned int offset, size_t bytes,
205 void *buf)
206{
207 return -EOPNOTSUPP;
208}
209
210static inline int nvmem_device_write(struct nvmem_device *nvmem,
211 unsigned int offset, size_t bytes,
212 void *buf)
213{
214 return -EOPNOTSUPP;
215}
216
217static inline const char *nvmem_dev_name(struct nvmem_device *nvmem)
218{
219 return NULL;
220}
221
222static inline void
223nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
224static inline void
225nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
226
227static inline int nvmem_register_notifier(struct notifier_block *nb)
228{
229 return -EOPNOTSUPP;
230}
231
232static inline int nvmem_unregister_notifier(struct notifier_block *nb)
233{
234 return -EOPNOTSUPP;
235}
236
237static inline struct nvmem_device *nvmem_device_find(void *data,
238 int (*match)(struct device *dev, const void *data))
239{
240 return NULL;
241}
242
243#endif /* CONFIG_NVMEM */
244
245#if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
246struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
247 const char *id);
248struct nvmem_device *of_nvmem_device_get(struct device_node *np,
249 const char *name);
250struct device_node *of_nvmem_layout_get_container(struct nvmem_device *nvmem);
251#else
252static inline struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
253 const char *id)
254{
255 return ERR_PTR(-EOPNOTSUPP);
256}
257
258static inline struct nvmem_device *of_nvmem_device_get(struct device_node *np,
259 const char *name)
260{
261 return ERR_PTR(-EOPNOTSUPP);
262}
263
264static inline struct device_node *
265of_nvmem_layout_get_container(struct nvmem_device *nvmem)
266{
267 return NULL;
268}
269#endif /* CONFIG_NVMEM && CONFIG_OF */
270
271#endif /* ifndef _LINUX_NVMEM_CONSUMER_H */