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/* SPDX-License-Identifier: GPL-2.0 */
/*
* ddbridge-i2c.h: Digital Devices bridge i2c driver
*
* Copyright (C) 2010-2017 Digital Devices GmbH
* Ralph Metzler <rjkm@metzlerbros.de>
* Marcus Metzler <mocm@metzlerbros.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 only, 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.
*/
#ifndef __DDBRIDGE_I2C_H__
#define __DDBRIDGE_I2C_H__
#include <linux/i2c.h>
#include "ddbridge.h"
/******************************************************************************/
void ddb_i2c_release(struct ddb *dev);
int ddb_i2c_init(struct ddb *dev);
/******************************************************************************/
static int __maybe_unused i2c_io(struct i2c_adapter *adapter, u8 adr,
u8 *wbuf, u32 wlen, u8 *rbuf, u32 rlen)
{
struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,
.buf = wbuf, .len = wlen },
{ .addr = adr, .flags = I2C_M_RD,
.buf = rbuf, .len = rlen } };
return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}
static int __maybe_unused i2c_write(struct i2c_adapter *adap, u8 adr,
u8 *data, int len)
{
struct i2c_msg msg = { .addr = adr, .flags = 0,
.buf = data, .len = len };
return (i2c_transfer(adap, &msg, 1) == 1) ? 0 : -1;
}
static int __maybe_unused i2c_read(struct i2c_adapter *adapter, u8 adr, u8 *val)
{
struct i2c_msg msgs[1] = { { .addr = adr, .flags = I2C_M_RD,
.buf = val, .len = 1 } };
return (i2c_transfer(adapter, msgs, 1) == 1) ? 0 : -1;
}
static int __maybe_unused i2c_read_regs(struct i2c_adapter *adapter,
u8 adr, u8 reg, u8 *val, u8 len)
{
struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,
.buf = ®, .len = 1 },
{ .addr = adr, .flags = I2C_M_RD,
.buf = val, .len = len } };
return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}
static int __maybe_unused i2c_read_regs16(struct i2c_adapter *adapter,
u8 adr, u16 reg, u8 *val, u8 len)
{
u8 msg[2] = { reg >> 8, reg & 0xff };
struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,
.buf = msg, .len = 2 },
{ .addr = adr, .flags = I2C_M_RD,
.buf = val, .len = len } };
return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}
static int __maybe_unused i2c_write_reg16(struct i2c_adapter *adap,
u8 adr, u16 reg, u8 val)
{
u8 msg[3] = { reg >> 8, reg & 0xff, val };
return i2c_write(adap, adr, msg, 3);
}
static int __maybe_unused i2c_write_reg(struct i2c_adapter *adap,
u8 adr, u8 reg, u8 val)
{
u8 msg[2] = { reg, val };
return i2c_write(adap, adr, msg, 2);
}
static int __maybe_unused i2c_read_reg16(struct i2c_adapter *adapter,
u8 adr, u16 reg, u8 *val)
{
return i2c_read_regs16(adapter, adr, reg, val, 1);
}
static int __maybe_unused i2c_read_reg(struct i2c_adapter *adapter,
u8 adr, u8 reg, u8 *val)
{
return i2c_read_regs(adapter, adr, reg, val, 1);
}
#endif /* __DDBRIDGE_I2C_H__ */
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