include/linux/nvmem-provider.h

   1 /*
   2  * nvmem framework provider.
   3  *
   4  * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
   5  * Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2.  This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #ifndef _LINUX_NVMEM_PROVIDER_H
  13 #define _LINUX_NVMEM_PROVIDER_H
  14
  15 struct nvmem_device;
  16 struct nvmem_cell_info;
  17 typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset,
  18                                 void *val, size_t bytes);
  19 typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
  20                                  void *val, size_t bytes);
  21
  22 struct nvmem_config {
  23         struct device           *dev;
  24         const char              *name;
  25         int                     id;
  26         struct module           *owner;
  27         const struct nvmem_cell_info    *cells;
  28         int                     ncells;
  29         bool                    read_only;
  30         bool                    root_only;
  31         nvmem_reg_read_t        reg_read;
  32         nvmem_reg_write_t       reg_write;
  33         int     size;
  34         int     word_size;
  35         int     stride;
  36         void    *priv;
  37         /* To be only used by old driver/misc/eeprom drivers */
  38         bool                    compat;
  39         struct device           *base_dev;
  40 };
  41
  42 #if IS_ENABLED(CONFIG_NVMEM)
  43
  44 struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
  45 int nvmem_unregister(struct nvmem_device *nvmem);
  46
  47 #else
  48
  49 static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
  50 {
  51         return ERR_PTR(-ENOSYS);
  52 }
  53
  54 static inline int nvmem_unregister(struct nvmem_device *nvmem)
  55 {
  56         return -ENOSYS;
  57 }
  58
  59 #endif /* CONFIG_NVMEM */
  60 #endif  /* ifndef _LINUX_NVMEM_PROVIDER_H */