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regmap: Add 1-Wire bus support

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Add basic support regmap (register map access) API for 1-Wire bus

Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alex A. Mihaylov 2017-06-02 10:06:27 +03:00 committed by Mark Brown
parent 2ea659a9ef
commit cc5d0db390
4 changed files with 285 additions and 1 deletions
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6
drivers/base/regmap/Kconfig
View File

@ -3,7 +3,7 @@
# subsystems should select the appropriate symbols.
config REGMAP
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
select LZO_COMPRESS
select LZO_DECOMPRESS
select IRQ_DOMAIN if REGMAP_IRQ
@ -24,6 +24,10 @@ config REGMAP_SPMI
tristate
depends on SPMI
config REGMAP_W1
tristate
depends on W1
config REGMAP_MMIO
tristate

1
drivers/base/regmap/Makefile
View File

@ -10,3 +10,4 @@ obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
obj-$(CONFIG_REGMAP_W1) += regmap-w1.o

245
drivers/base/regmap/regmap-w1.c Normal file
View File

@ -0,0 +1,245 @@
/*
* Register map access API - W1 (1-Wire) support
*
* Copyright (C) 2017 OAO Radioavionica
* Author: Alex A. Mihaylov <minimumlaw@rambler.ru>
*
* 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/module.h>
#include "../../w1/w1.h"
#include "internal.h"
#define W1_CMD_READ_DATA 0x69
#define W1_CMD_WRITE_DATA 0x6C
/*
* 1-Wire slaves registers with addess 8 bit and data 8 bit
*/
static int w1_reg_a8_v8_read(void *context, unsigned int reg, unsigned int *val)
{
struct device *dev = context;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret = 0;
if (reg > 255)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (!w1_reset_select_slave(sl)) {
w1_write_8(sl->master, W1_CMD_READ_DATA);
w1_write_8(sl->master, reg);
*val = w1_read_8(sl->master);
} else {
ret = -ENODEV;
}
mutex_unlock(&sl->master->bus_mutex);
return ret;
}
static int w1_reg_a8_v8_write(void *context, unsigned int reg, unsigned int val)
{
struct device *dev = context;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret = 0;
if (reg > 255)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (!w1_reset_select_slave(sl)) {
w1_write_8(sl->master, W1_CMD_WRITE_DATA);
w1_write_8(sl->master, reg);
w1_write_8(sl->master, val);
} else {
ret = -ENODEV;
}
mutex_unlock(&sl->master->bus_mutex);
return ret;
}
/*
* 1-Wire slaves registers with addess 8 bit and data 16 bit
*/
static int w1_reg_a8_v16_read(void *context, unsigned int reg,
unsigned int *val)
{
struct device *dev = context;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret = 0;
if (reg > 255)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (!w1_reset_select_slave(sl)) {
w1_write_8(sl->master, W1_CMD_READ_DATA);
w1_write_8(sl->master, reg);
*val = w1_read_8(sl->master);
*val |= w1_read_8(sl->master)<<8;
} else {
ret = -ENODEV;
}
mutex_unlock(&sl->master->bus_mutex);
return ret;
}
static int w1_reg_a8_v16_write(void *context, unsigned int reg,
unsigned int val)
{
struct device *dev = context;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret = 0;
if (reg > 255)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (!w1_reset_select_slave(sl)) {
w1_write_8(sl->master, W1_CMD_WRITE_DATA);
w1_write_8(sl->master, reg);
w1_write_8(sl->master, val & 0x00FF);
w1_write_8(sl->master, val>>8 & 0x00FF);
} else {
ret = -ENODEV;
}
mutex_unlock(&sl->master->bus_mutex);
return ret;
}
/*
* 1-Wire slaves registers with addess 16 bit and data 16 bit
*/
static int w1_reg_a16_v16_read(void *context, unsigned int reg,
unsigned int *val)
{
struct device *dev = context;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret = 0;
if (reg > 65535)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (!w1_reset_select_slave(sl)) {
w1_write_8(sl->master, W1_CMD_READ_DATA);
w1_write_8(sl->master, reg & 0x00FF);
w1_write_8(sl->master, reg>>8 & 0x00FF);
*val = w1_read_8(sl->master);
*val |= w1_read_8(sl->master)<<8;
} else {
ret = -ENODEV;
}
mutex_unlock(&sl->master->bus_mutex);
return ret;
}
static int w1_reg_a16_v16_write(void *context, unsigned int reg,
unsigned int val)
{
struct device *dev = context;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret = 0;
if (reg > 65535)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (!w1_reset_select_slave(sl)) {
w1_write_8(sl->master, W1_CMD_WRITE_DATA);
w1_write_8(sl->master, reg & 0x00FF);
w1_write_8(sl->master, reg>>8 & 0x00FF);
w1_write_8(sl->master, val & 0x00FF);
w1_write_8(sl->master, val>>8 & 0x00FF);
} else {
ret = -ENODEV;
}
mutex_unlock(&sl->master->bus_mutex);
return ret;
}
/*
* Various types of supported bus addressing
*/
static struct regmap_bus regmap_w1_bus_a8_v8 = {
.reg_read = w1_reg_a8_v8_read,
.reg_write = w1_reg_a8_v8_write,
};
static struct regmap_bus regmap_w1_bus_a8_v16 = {
.reg_read = w1_reg_a8_v16_read,
.reg_write = w1_reg_a8_v16_write,
};
static struct regmap_bus regmap_w1_bus_a16_v16 = {
.reg_read = w1_reg_a16_v16_read,
.reg_write = w1_reg_a16_v16_write,
};
static const struct regmap_bus *regmap_get_w1_bus(struct device *w1_dev,
const struct regmap_config *config)
{
if (config->reg_bits == 8 && config->val_bits == 8)
return &regmap_w1_bus_a8_v8;
if (config->reg_bits == 8 && config->val_bits == 16)
return &regmap_w1_bus_a8_v16;
if (config->reg_bits == 16 && config->val_bits == 16)
return &regmap_w1_bus_a16_v16;
return ERR_PTR(-ENOTSUPP);
}
struct regmap *__regmap_init_w1(struct device *w1_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
const struct regmap_bus *bus = regmap_get_w1_bus(w1_dev, config);
if (IS_ERR(bus))
return ERR_CAST(bus);
return __regmap_init(w1_dev, bus, w1_dev, config,
lock_key, lock_name);
return NULL;
}
EXPORT_SYMBOL_GPL(__regmap_init_w1);
struct regmap *__devm_regmap_init_w1(struct device *w1_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
const struct regmap_bus *bus = regmap_get_w1_bus(w1_dev, config);
if (IS_ERR(bus))
return ERR_CAST(bus);
return __devm_regmap_init(w1_dev, bus, w1_dev, config,
lock_key, lock_name);
return NULL;
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_w1);
MODULE_LICENSE("GPL");

34
include/linux/regmap.h
View File

@ -461,6 +461,10 @@ struct regmap *__regmap_init_spmi_ext(struct spmi_device *dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_w1(struct device *w1_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_mmio_clk(struct device *dev, const char *clk_id,
void __iomem *regs,
const struct regmap_config *config,
@ -493,6 +497,10 @@ struct regmap *__devm_regmap_init_spmi_ext(struct spmi_device *dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init_w1(struct device *w1_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init_mmio_clk(struct device *dev,
const char *clk_id,
void __iomem *regs,
@ -596,6 +604,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
__regmap_lockdep_wrapper(__regmap_init_spmi_ext, #config, \
dev, config)
/**
* regmap_init_w1() - Initialise register map
*
* @w1_dev: 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.
*/
#define regmap_init_w1(w1_dev, config) \
__regmap_lockdep_wrapper(__regmap_init_w1, #config, \
w1_dev, config)
/**
* regmap_init_mmio_clk() - Initialise register map with register clock
*
@ -711,6 +732,19 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__devm_regmap_init_spmi_ext, #config, \
dev, config)
/**
* devm_regmap_init_w1() - Initialise managed register map
*
* @w1_dev: 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 regmap will be automatically freed by the
* device management code.
*/
#define devm_regmap_init_w1(w1_dev, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_w1, #config, \
w1_dev, config)
/**
* devm_regmap_init_mmio_clk() - Initialise managed register map with clock
*