/*
* Register map access API - SPMI support
*
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* Based on regmap-i2c.c:
* 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 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/regmap.h>
#include <linux/spmi.h>
#include <linux/module.h>
#include <linux/init.h>
static int regmap_spmi_base_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
u8 addr = *(u8 *)reg;
int err = 0;
BUG_ON(reg_size != 1);
while (val_size-- && !err)
err = spmi_register_read(context, addr++, val++);
return err;
}
static int regmap_spmi_base_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_size)
{
const u8 *data = val;
u8 addr = *(u8 *)reg;
int err = 0;
BUG_ON(reg_size != 1);
/*
* SPMI defines a more bandwidth-efficient 'Register 0 Write' sequence,
* use it when possible.
*/
if (addr == 0 && val_size) {
err = spmi_register_zero_write(context, *data);
if (err)
goto err_out;
data++;
addr++;
val_size--;
}
while (val_size) {
err = spmi_register_write(context, addr, *data);
if (err)
goto err_out;
data++;
addr++;
val_size--;
}
err_out:
return err;
}
static int regmap_spmi_base_write(void *context, const void *data,
size_t count)
{
BUG_ON(count < 1);
return regmap_spmi_base_gather_write(context, data, 1, data + 1,
count - 1);
}
static struct regmap_bus regmap_spmi_base = {
.read = regmap_spmi_base_read,
.write = regmap_spmi_base_write,
.gather_write = regmap_spmi_base_gather_write,
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
};
/**
* regmap_init_spmi_base(): Create regmap for the Base register space
* @sdev: SPMI 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_spmi_base(struct spmi_device *sdev,
const struct regmap_config *config)
{
return regmap_init(&sdev->dev, ®map_spmi_base, sdev, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spmi_base);
/**
* devm_regmap_init_spmi_base(): Create managed regmap for Base register space
* @sdev: SPMI 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.
*/
struct regmap *devm_regmap_init_spmi_base(struct spmi_device *sdev,
const struct regmap_config *config)
{
return devm_regmap_init(&sdev->dev, ®map_spmi_base, sdev, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_base);
static int regmap_spmi_ext_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
int err = 0;
size_t len;
u16 addr;
BUG_ON(reg_size != 2);
addr = *(u16 *)reg;
/*
* Split accesses into two to take advantage of the more
* bandwidth-efficient 'Extended Register Read' command when possible
*/
while (addr <= 0xFF && val_size) {
len = min_t(size_t, val_size, 16);
err = spmi_ext_register_read(context, addr, val, len);
if (err)
goto err_out;
addr += len;
val += len;
val_size -= len;
}
while (val_size) {
len = min_t(size_t, val_size, 8);
err = spmi_ext_register_readl(context, addr, val, val_size);
if (err)
goto err_out;
addr += len;
val += len;
val_size -= len;
}
err_out:
return err;
}
static int regmap_spmi_ext_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_size)
{
int err = 0;
size_t len;
u16 addr;
BUG_ON(reg_size != 2);
addr = *(u16 *)reg;
while (addr <= 0xFF && val_size) {
len = min_t(size_t, val_size, 16);
err = spmi_ext_register_write(context, addr, val, len);
if (err)
goto err_out;
addr += len;
val += len;
val_size -= len;
}
while (val_size) {
len = min_t(size_t, val_size, 8);
err = spmi_ext_register_writel(context, addr, val, len);
if (err)
goto err_out;
addr += len;
val += len;
val_size -= len;
}
err_out:
return err;
}
static int regmap_spmi_ext_write(void *context, const void *data,
size_t count)
{
BUG_ON(count < 2);
return regmap_spmi_ext_gather_write(context, data, 2, data + 2,
count - 2);
}
static struct regmap_bus regmap_spmi_ext = {
.read = regmap_spmi_ext_read,
.write = regmap_spmi_ext_write,
.gather_write = regmap_spmi_ext_gather_write,
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
};
/**
* regmap_init_spmi_ext(): Create regmap for Ext register space
* @sdev: 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_spmi_ext(struct spmi_device *sdev,
const struct regmap_config *config)
{
return regmap_init(&sdev->dev, ®map_spmi_ext, sdev, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spmi_ext);
/**
* devm_regmap_init_spmi_ext(): Create managed regmap for Ext register space
* @sdev: SPMI 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.
*/
struct regmap *devm_regmap_init_spmi_ext(struct spmi_device *sdev,
const struct regmap_config *config)
{
return devm_regmap_init(&sdev->dev, ®map_spmi_ext, sdev, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_ext);
MODULE_LICENSE("GPL");