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/*
* Register map access API - AC'97 support
*
* Copyright 2013 Linaro Ltd. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/ac97_codec.h>
bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case AC97_RESET:
case AC97_POWERDOWN:
case AC97_INT_PAGING:
case AC97_EXTENDED_ID:
case AC97_EXTENDED_STATUS:
case AC97_EXTENDED_MID:
case AC97_EXTENDED_MSTATUS:
case AC97_GPIO_STATUS:
case AC97_MISC_AFE:
case AC97_VENDOR_ID1:
case AC97_VENDOR_ID2:
case AC97_CODEC_CLASS_REV:
case AC97_PCI_SVID:
case AC97_PCI_SID:
case AC97_FUNC_SELECT:
case AC97_FUNC_INFO:
case AC97_SENSE_INFO:
return true;
default:
return false;
}
}
EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
static int regmap_ac97_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct snd_ac97 *ac97 = context;
*val = ac97->bus->ops->read(ac97, reg);
return 0;
}
static int regmap_ac97_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct snd_ac97 *ac97 = context;
ac97->bus->ops->write(ac97, reg, val);
return 0;
}
static const struct regmap_bus ac97_regmap_bus = {
.reg_write = regmap_ac97_reg_write,
.reg_read = regmap_ac97_reg_read,
};
/**
* regmap_init_ac97(): Initialise AC'97 register map
*
* @ac97: 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_ac97(struct snd_ac97 *ac97,
const struct regmap_config *config)
{
return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
}
EXPORT_SYMBOL_GPL(regmap_init_ac97);
/**
* devm_regmap_init_ac97(): Initialise AC'97 register map
*
* @ac97: 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_ac97(struct snd_ac97 *ac97,
const struct regmap_config *config)
{
return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_ac97);
MODULE_LICENSE("GPL v2");
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