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https://github.com/AsahiLinux/u-boot
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85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* maxim_codec.c -- MAXIM CODEC Common driver
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*
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* Copyright 2011 Maxim Integrated Products
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*/
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#include <common.h>
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#include <div64.h>
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#include <i2c.h>
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#include <i2s.h>
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#include <log.h>
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#include <sound.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include "maxim_codec.h"
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/*
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* Writes value to a device register through i2c
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*
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* @param priv Private data for driver
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* @param reg reg number to be write
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* @param data data to be writen to the above registor
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*
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* @return int value 1 for change, 0 for no change or negative error code.
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*/
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int maxim_i2c_write(struct maxim_priv *priv, unsigned int reg,
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unsigned char data)
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{
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debug("%s: Write Addr : 0x%02X, Data : 0x%02X\n",
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__func__, reg, data);
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return dm_i2c_write(priv->dev, reg, &data, 1);
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}
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/*
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* Read a value from a device register through i2c
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*
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* @param priv Private data for driver
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* @param reg reg number to be read
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* @param data address of read data to be stored
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*
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* @return int value 0 for success, -1 in case of error.
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*/
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unsigned int maxim_i2c_read(struct maxim_priv *priv, unsigned int reg,
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unsigned char *data)
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{
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int ret;
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return dm_i2c_read(priv->dev, reg, data, 1);
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if (ret != 0) {
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debug("%s: Error while reading register %#04x\n",
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__func__, reg);
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return -1;
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}
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return 0;
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}
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/*
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* update device register bits through i2c
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*
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* @param priv Private data for driver
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* @param reg codec register
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* @param mask register mask
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* @param value new value
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*
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* @return int value 0 for success, non-zero error code.
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*/
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int maxim_bic_or(struct maxim_priv *priv, unsigned int reg, unsigned char mask,
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unsigned char value)
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{
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int change, ret = 0;
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unsigned char old, new;
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if (maxim_i2c_read(priv, reg, &old) != 0)
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return -1;
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new = (old & ~mask) | (value & mask);
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change = (old != new) ? 1 : 0;
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if (change)
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ret = maxim_i2c_write(priv, reg, new);
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if (ret < 0)
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return ret;
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return change;
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}
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