113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
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* ddbridge-i2c.c: Digital Devices bridge i2c driver
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*
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* Copyright (C) 2010-2017 Digital Devices GmbH
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* Ralph Metzler <rjkm@metzlerbros.de>
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* Marcus Metzler <mocm@metzlerbros.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 only, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __DDBRIDGE_I2C_H__
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#define __DDBRIDGE_I2C_H__
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#include <linux/i2c.h>
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#include "ddbridge.h"
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/******************************************************************************/
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void ddb_i2c_release(struct ddb *dev);
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int ddb_i2c_init(struct ddb *dev);
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/******************************************************************************/
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static int __maybe_unused i2c_io(struct i2c_adapter *adapter, u8 adr,
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u8 *wbuf, u32 wlen, u8 *rbuf, u32 rlen)
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{
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struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,
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.buf = wbuf, .len = wlen },
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{ .addr = adr, .flags = I2C_M_RD,
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.buf = rbuf, .len = rlen } };
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return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
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}
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static int __maybe_unused i2c_write(struct i2c_adapter *adap, u8 adr,
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u8 *data, int len)
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{
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struct i2c_msg msg = { .addr = adr, .flags = 0,
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.buf = data, .len = len };
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return (i2c_transfer(adap, &msg, 1) == 1) ? 0 : -1;
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}
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static int __maybe_unused i2c_read(struct i2c_adapter *adapter, u8 adr, u8 *val)
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{
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struct i2c_msg msgs[1] = { { .addr = adr, .flags = I2C_M_RD,
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.buf = val, .len = 1 } };
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return (i2c_transfer(adapter, msgs, 1) == 1) ? 0 : -1;
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}
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static int __maybe_unused i2c_read_regs(struct i2c_adapter *adapter,
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u8 adr, u8 reg, u8 *val, u8 len)
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{
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struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,
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.buf = ®, .len = 1 },
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{ .addr = adr, .flags = I2C_M_RD,
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.buf = val, .len = len } };
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return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
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}
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static int __maybe_unused i2c_read_regs16(struct i2c_adapter *adapter,
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u8 adr, u16 reg, u8 *val, u8 len)
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{
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u8 msg[2] = { reg >> 8, reg & 0xff };
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struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,
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.buf = msg, .len = 2 },
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{ .addr = adr, .flags = I2C_M_RD,
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.buf = val, .len = len } };
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return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
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}
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static int __maybe_unused i2c_write_reg16(struct i2c_adapter *adap,
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u8 adr, u16 reg, u8 val)
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{
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u8 msg[3] = { reg >> 8, reg & 0xff, val };
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return i2c_write(adap, adr, msg, 3);
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}
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static int __maybe_unused i2c_write_reg(struct i2c_adapter *adap,
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u8 adr, u8 reg, u8 val)
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{
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u8 msg[2] = { reg, val };
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return i2c_write(adap, adr, msg, 2);
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}
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static int __maybe_unused i2c_read_reg16(struct i2c_adapter *adapter,
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u8 adr, u16 reg, u8 *val)
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{
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return i2c_read_regs16(adapter, adr, reg, val, 1);
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}
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static int __maybe_unused i2c_read_reg(struct i2c_adapter *adapter,
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u8 adr, u8 reg, u8 *val)
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{
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return i2c_read_regs(adapter, adr, reg, val, 1);
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}
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#endif /* __DDBRIDGE_I2C_H__ */
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