162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
/* 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>
|
|
#include <linux/gpio/consumer.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,
|
|
NVMEM_TYPE_FRAM,
|
|
};
|
|
|
|
#define NVMEM_DEVID_NONE (-1)
|
|
#define NVMEM_DEVID_AUTO (-2)
|
|
|
|
/**
|
|
* struct nvmem_keepout - NVMEM register keepout range.
|
|
*
|
|
* @start: The first byte offset to avoid.
|
|
* @end: One beyond the last byte offset to avoid.
|
|
* @value: The byte to fill reads with for this region.
|
|
*/
|
|
struct nvmem_keepout {
|
|
unsigned int start;
|
|
unsigned int end;
|
|
unsigned char value;
|
|
};
|
|
|
|
/**
|
|
* 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.
|
|
* @keepout: Optional array of keepout ranges (sorted ascending by start).
|
|
* @nkeepout: Number of elements in the keepout array.
|
|
* @type: Type of the nvmem storage
|
|
* @read_only: Device is read-only.
|
|
* @root_only: Device is accessibly to root only.
|
|
* @of_node: If given, this will be used instead of the parent's of_node.
|
|
* @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.
|
|
* @wp-gpio: Write protect pin
|
|
*
|
|
* 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;
|
|
struct gpio_desc *wp_gpio;
|
|
const struct nvmem_cell_info *cells;
|
|
int ncells;
|
|
const struct nvmem_keepout *keepout;
|
|
unsigned int nkeepout;
|
|
enum nvmem_type type;
|
|
bool read_only;
|
|
bool root_only;
|
|
struct device_node *of_node;
|
|
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 */
|