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33cf42e68e
This is required by layouts that need to read whole NVMEM content. It's especially useful for NVMEM devices without hardcoded layout (like U-Boot environment data block). Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/r/20231221173421.13737-2-zajec5@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
266 lines
6.9 KiB
C
266 lines
6.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* nvmem framework consumer.
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*
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* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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* Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#ifndef _LINUX_NVMEM_CONSUMER_H
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#define _LINUX_NVMEM_CONSUMER_H
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/notifier.h>
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struct device;
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struct device_node;
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/* consumer cookie */
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struct nvmem_cell;
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struct nvmem_device;
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struct nvmem_cell_info;
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/**
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* struct nvmem_cell_lookup - cell lookup entry
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*
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* @nvmem_name: Name of the provider.
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* @cell_name: Name of the nvmem cell as defined in the name field of
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* struct nvmem_cell_info.
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* @dev_id: Name of the consumer device that will be associated with
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* this cell.
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* @con_id: Connector id for this cell lookup.
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*/
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struct nvmem_cell_lookup {
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const char *nvmem_name;
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const char *cell_name;
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const char *dev_id;
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const char *con_id;
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struct list_head node;
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};
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enum {
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NVMEM_ADD = 1,
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NVMEM_REMOVE,
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NVMEM_CELL_ADD,
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NVMEM_CELL_REMOVE,
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NVMEM_LAYOUT_ADD,
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NVMEM_LAYOUT_REMOVE,
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};
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#if IS_ENABLED(CONFIG_NVMEM)
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/* Cell based interface */
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struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id);
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struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *id);
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void nvmem_cell_put(struct nvmem_cell *cell);
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void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
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void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
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int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
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int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);
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int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val);
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int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val);
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int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val);
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int nvmem_cell_read_variable_le_u32(struct device *dev, const char *cell_id,
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u32 *val);
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int nvmem_cell_read_variable_le_u64(struct device *dev, const char *cell_id,
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u64 *val);
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/* direct nvmem device read/write interface */
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struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
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struct nvmem_device *devm_nvmem_device_get(struct device *dev,
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const char *name);
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void nvmem_device_put(struct nvmem_device *nvmem);
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void devm_nvmem_device_put(struct device *dev, struct nvmem_device *nvmem);
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int nvmem_device_read(struct nvmem_device *nvmem, unsigned int offset,
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size_t bytes, void *buf);
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int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset,
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size_t bytes, void *buf);
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ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
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struct nvmem_cell_info *info, void *buf);
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int nvmem_device_cell_write(struct nvmem_device *nvmem,
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struct nvmem_cell_info *info, void *buf);
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const char *nvmem_dev_name(struct nvmem_device *nvmem);
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size_t nvmem_dev_size(struct nvmem_device *nvmem);
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void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries,
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size_t nentries);
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void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries,
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size_t nentries);
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int nvmem_register_notifier(struct notifier_block *nb);
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int nvmem_unregister_notifier(struct notifier_block *nb);
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struct nvmem_device *nvmem_device_find(void *data,
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int (*match)(struct device *dev, const void *data));
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#else
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static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
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const char *id)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline struct nvmem_cell *devm_nvmem_cell_get(struct device *dev,
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const char *id)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline void devm_nvmem_cell_put(struct device *dev,
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struct nvmem_cell *cell)
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{
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}
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static inline void nvmem_cell_put(struct nvmem_cell *cell)
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{
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}
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static inline void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline int nvmem_cell_write(struct nvmem_cell *cell,
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void *buf, size_t len)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_cell_read_u8(struct device *dev,
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const char *cell_id, u8 *val)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_cell_read_u16(struct device *dev,
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const char *cell_id, u16 *val)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_cell_read_u32(struct device *dev,
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const char *cell_id, u32 *val)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_cell_read_u64(struct device *dev,
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const char *cell_id, u64 *val)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_cell_read_variable_le_u32(struct device *dev,
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const char *cell_id,
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u32 *val)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_cell_read_variable_le_u64(struct device *dev,
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const char *cell_id,
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u64 *val)
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{
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return -EOPNOTSUPP;
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}
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static inline struct nvmem_device *nvmem_device_get(struct device *dev,
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const char *name)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline struct nvmem_device *devm_nvmem_device_get(struct device *dev,
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const char *name)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline void nvmem_device_put(struct nvmem_device *nvmem)
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{
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}
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static inline void devm_nvmem_device_put(struct device *dev,
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struct nvmem_device *nvmem)
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{
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}
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static inline ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
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struct nvmem_cell_info *info,
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void *buf)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_device_cell_write(struct nvmem_device *nvmem,
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struct nvmem_cell_info *info,
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void *buf)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_device_read(struct nvmem_device *nvmem,
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unsigned int offset, size_t bytes,
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void *buf)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_device_write(struct nvmem_device *nvmem,
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unsigned int offset, size_t bytes,
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void *buf)
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{
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return -EOPNOTSUPP;
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}
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static inline const char *nvmem_dev_name(struct nvmem_device *nvmem)
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{
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return NULL;
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}
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static inline void
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nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
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static inline void
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nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
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static inline int nvmem_register_notifier(struct notifier_block *nb)
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{
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return -EOPNOTSUPP;
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}
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static inline int nvmem_unregister_notifier(struct notifier_block *nb)
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{
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return -EOPNOTSUPP;
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}
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static inline struct nvmem_device *nvmem_device_find(void *data,
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int (*match)(struct device *dev, const void *data))
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{
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return NULL;
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}
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#endif /* CONFIG_NVMEM */
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#if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
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struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
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const char *id);
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struct nvmem_device *of_nvmem_device_get(struct device_node *np,
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const char *name);
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#else
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static inline struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
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const char *id)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline struct nvmem_device *of_nvmem_device_get(struct device_node *np,
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const char *name)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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#endif /* CONFIG_NVMEM && CONFIG_OF */
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#endif /* ifndef _LINUX_NVMEM_CONSUMER_H */
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