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regmap: Add SPI bus support 

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Mark Brown 2011-05-12 11:42:10 +02:00
parent 9943fa300a
commit a676f08306
4 changed files with 81 additions and 1 deletions
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5
drivers/base/regmap/Kconfig
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@ -3,8 +3,11 @@
# subsystems should select the appropriate symbols.
config REGMAP
default y if REGMAP_I2C
default y if (REGMAP_I2C || REGMAP_SPI)
bool
config REGMAP_I2C
tristate
config REGMAP_SPI
tristate

1
drivers/base/regmap/Makefile
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@ -1,2 +1,3 @@
obj-$(CONFIG_REGMAP) += regmap.o
obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o

72
drivers/base/regmap/regmap-spi.c Normal file
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@ -0,0 +1,72 @@
/*
* 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>
static int regmap_spi_write(struct device *dev, const void *data, size_t count)
{
struct spi_device *spi = to_spi_device(dev);
return spi_write(spi, data, count);
}
static int regmap_spi_gather_write(struct device *dev,
const void *reg, size_t reg_len,
const void *val, size_t val_len)
{
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(struct device *dev,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
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 = {
.type = &spi_bus_type,
.write = regmap_spi_write,
.gather_write = regmap_spi_gather_write,
.read = regmap_spi_read,
.owner = THIS_MODULE,
.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, &regmap_spi, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spi);

4
include/linux/regmap.h
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@ -18,6 +18,7 @@
#include <linux/module.h>
struct i2c_client;
struct spi_device;
struct regmap_config {
int reg_bits;
@ -63,6 +64,9 @@ struct regmap *regmap_init(struct device *dev,
const struct regmap_config *config);
struct regmap *regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config);
struct regmap *regmap_init_spi(struct spi_device *dev,
const struct regmap_config *config);
void regmap_exit(struct regmap *map);
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
int regmap_raw_write(struct regmap *map, unsigned int reg,