0135bbcc7a
The only context needed by I2C and SPI bus definitions is the device itself; this can be converted to an i2c_client or spi_device in order to perform IO on the device. However, other bus types may need more context in order to perform IO. Enable this by having regmap_init accept a bus_context parameter, and pass this to all bus callbacks. The existing callbacks simply pass the struct device here. Future bus types may pass something else. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/*
|
|
* Register map access API - SPI support
|
|
*
|
|
* Copyright 2011 Wolfson Microelectronics plc
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/regmap.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
|
|
static int regmap_spi_write(void *context, const void *data, size_t count)
|
|
{
|
|
struct device *dev = context;
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
|
|
return spi_write(spi, data, count);
|
|
}
|
|
|
|
static int regmap_spi_gather_write(void *context,
|
|
const void *reg, size_t reg_len,
|
|
const void *val, size_t val_len)
|
|
{
|
|
struct device *dev = context;
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct spi_message m;
|
|
struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
|
|
{ .tx_buf = val, .len = val_len, }, };
|
|
|
|
spi_message_init(&m);
|
|
spi_message_add_tail(&t[0], &m);
|
|
spi_message_add_tail(&t[1], &m);
|
|
|
|
return spi_sync(spi, &m);
|
|
}
|
|
|
|
static int regmap_spi_read(void *context,
|
|
const void *reg, size_t reg_size,
|
|
void *val, size_t val_size)
|
|
{
|
|
struct device *dev = context;
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
|
|
return spi_write_then_read(spi, reg, reg_size, val, val_size);
|
|
}
|
|
|
|
static struct regmap_bus regmap_spi = {
|
|
.write = regmap_spi_write,
|
|
.gather_write = regmap_spi_gather_write,
|
|
.read = regmap_spi_read,
|
|
.read_flag_mask = 0x80,
|
|
};
|
|
|
|
/**
|
|
* regmap_init_spi(): Initialise register map
|
|
*
|
|
* @spi: Device that will be interacted with
|
|
* @config: Configuration for register map
|
|
*
|
|
* The return value will be an ERR_PTR() on error or a valid pointer to
|
|
* a struct regmap.
|
|
*/
|
|
struct regmap *regmap_init_spi(struct spi_device *spi,
|
|
const struct regmap_config *config)
|
|
{
|
|
return regmap_init(&spi->dev, ®map_spi, &spi->dev, config);
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_init_spi);
|
|
|
|
/**
|
|
* devm_regmap_init_spi(): Initialise register map
|
|
*
|
|
* @spi: Device that will be interacted with
|
|
* @config: Configuration for register map
|
|
*
|
|
* The return value will be an ERR_PTR() on error or a valid pointer
|
|
* to a struct regmap. The map will be automatically freed by the
|
|
* device management code.
|
|
*/
|
|
struct regmap *devm_regmap_init_spi(struct spi_device *spi,
|
|
const struct regmap_config *config)
|
|
{
|
|
return devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
|
|
|
|
MODULE_LICENSE("GPL");
|