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/* SPDX-License-Identifier: GPL-2.0 */ /* * nvmem framework provider. * * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org> * Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com> */ #ifndef _LINUX_NVMEM_PROVIDER_H #define _LINUX_NVMEM_PROVIDER_H #include <linux/err.h> #include <linux/errno.h> struct nvmem_device; struct nvmem_cell_info; typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset, void *val, size_t bytes); typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset, void *val, size_t bytes); enum nvmem_type { NVMEM_TYPE_UNKNOWN = 0, NVMEM_TYPE_EEPROM, NVMEM_TYPE_OTP, NVMEM_TYPE_BATTERY_BACKED, }; /** * struct nvmem_config - NVMEM device configuration * * @dev: Parent device. * @name: Optional name. * @id: Optional device ID used in full name. Ignored if name is NULL. * @owner: Pointer to exporter module. Used for refcounting. * @cells: Optional array of pre-defined NVMEM cells. * @ncells: Number of elements in cells. * @type: Type of the nvmem storage * @read_only: Device is read-only. * @root_only: Device is accessibly to root only. * @no_of_node: Device should not use the parent's of_node even if it's !NULL. * @reg_read: Callback to read data. * @reg_write: Callback to write data. * @size: Device size. * @word_size: Minimum read/write access granularity. * @stride: Minimum read/write access stride. * @priv: User context passed to read/write callbacks. * * Note: A default "nvmem<id>" name will be assigned to the device if * no name is specified in its configuration. In such case "<id>" is * generated with ida_simple_get() and provided id field is ignored. * * Note: Specifying name and setting id to -1 implies a unique device * whose name is provided as-is (kept unaltered). */ struct nvmem_config { struct device *dev; const char *name; int id; struct module *owner; const struct nvmem_cell_info *cells; int ncells; enum nvmem_type type; bool read_only; bool root_only; bool no_of_node; nvmem_reg_read_t reg_read; nvmem_reg_write_t reg_write; int size; int word_size; int stride; void *priv; /* To be only used by old driver/misc/eeprom drivers */ bool compat; struct device *base_dev; }; /** * struct nvmem_cell_table - NVMEM cell definitions for given provider * * @nvmem_name: Provider name. * @cells: Array of cell definitions. * @ncells: Number of cell definitions in the array. * @node: List node. * * This structure together with related helper functions is provided for users * that don't can't access the nvmem provided structure but wish to register * cell definitions for it e.g. board files registering an EEPROM device. */ struct nvmem_cell_table { const char *nvmem_name; const struct nvmem_cell_info *cells; size_t ncells; struct list_head node; }; #if IS_ENABLED(CONFIG_NVMEM) struct nvmem_device *nvmem_register(const struct nvmem_config *cfg); void nvmem_unregister(struct nvmem_device *nvmem); struct nvmem_device *devm_nvmem_register(struct device *dev, const struct nvmem_config *cfg); int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem); void nvmem_add_cell_table(struct nvmem_cell_table *table); void nvmem_del_cell_table(struct nvmem_cell_table *table); #else static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c) { return ERR_PTR(-EOPNOTSUPP); } static inline void nvmem_unregister(struct nvmem_device *nvmem) {} static inline struct nvmem_device * devm_nvmem_register(struct device *dev, const struct nvmem_config *c) { return nvmem_register(c); } static inline int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem) { return -EOPNOTSUPP; } static inline void nvmem_add_cell_table(struct nvmem_cell_table *table) {} static inline void nvmem_del_cell_table(struct nvmem_cell_table *table) {} #endif /* CONFIG_NVMEM */ #endif /* ifndef _LINUX_NVMEM_PROVIDER_H */
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