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 #include <linux/err.h>
  16 #include <linux/errno.h>
  17
  18 struct nvmem_device;
  19 struct nvmem_cell_info;
  20 typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset,
  21                                 void *val, size_t bytes);
  22 typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
  23                                  void *val, size_t bytes);
  24
  25 struct nvmem_config {
  26         struct device           *dev;
  27         const char              *name;
  28         int                     id;
  29         struct module           *owner;
  30         const struct nvmem_cell_info    *cells;
  31         int                     ncells;
  32         bool                    read_only;
  33         bool                    root_only;
  34         nvmem_reg_read_t        reg_read;
  35         nvmem_reg_write_t       reg_write;
  36         int     size;
  37         int     word_size;
  38         int     stride;
  39         void    *priv;
  40         /* To be only used by old driver/misc/eeprom drivers */
  41         bool                    compat;
  42         struct device           *base_dev;
  43 };
  44
  45 #if IS_ENABLED(CONFIG_NVMEM)
  46
  47 struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
  48 int nvmem_unregister(struct nvmem_device *nvmem);
  49
  50 #else
  51
  52 static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
  53 {
  54         return ERR_PTR(-ENOSYS);
  55 }
  56
  57 static inline int nvmem_unregister(struct nvmem_device *nvmem)
  58 {
  59         return -ENOSYS;
  60 }
  61
  62 #endif /* CONFIG_NVMEM */
  63 #endif  /* ifndef _LINUX_NVMEM_PROVIDER_H */