b3db17e4b8
Not all platforms use device tree. It is useful to be able to add cells to a NVMEM device from code. Export nvmem_add_cells() so making this possible. This required changing the parameters a bit, so that just the cells and the number of cells are passed, not the whole nvmem config structure. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/*
|
|
* nvmem framework provider.
|
|
*
|
|
* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
|
|
* Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#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);
|
|
|
|
/**
|
|
* 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.
|
|
* @read_only: Device is read-only.
|
|
* @root_only: Device is accessibly to root only.
|
|
* @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;
|
|
bool read_only;
|
|
bool root_only;
|
|
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;
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_NVMEM)
|
|
|
|
struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
|
|
int 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);
|
|
|
|
int nvmem_add_cells(struct nvmem_device *nvmem,
|
|
const struct nvmem_cell_info *info,
|
|
int ncells);
|
|
#else
|
|
|
|
static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
static inline int nvmem_unregister(struct nvmem_device *nvmem)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
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 nvmem_unregister(nvmem);
|
|
|
|
}
|
|
|
|
static inline int nvmem_add_cells(struct nvmem_device *nvmem,
|
|
const struct nvmem_cell_info *info,
|
|
int ncells)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* CONFIG_NVMEM */
|
|
#endif /* ifndef _LINUX_NVMEM_PROVIDER_H */
|