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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * ddbridge-i2c.h: Digital Devices bridge i2c driver4 *5 * Copyright (C) 2010-2017 Digital Devices GmbH6 * Ralph Metzler <rjkm@metzlerbros.de>7 * Marcus Metzler <mocm@metzlerbros.de>8 */9 10#ifndef __DDBRIDGE_I2C_H__11#define __DDBRIDGE_I2C_H__12 13#include <linux/i2c.h>14 15#include "ddbridge.h"16 17/******************************************************************************/18 19void ddb_i2c_release(struct ddb *dev);20int ddb_i2c_init(struct ddb *dev);21 22/******************************************************************************/23 24static int __maybe_unused i2c_io(struct i2c_adapter *adapter, u8 adr,25 u8 *wbuf, u32 wlen, u8 *rbuf, u32 rlen)26{27 struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,28 .buf = wbuf, .len = wlen },29 { .addr = adr, .flags = I2C_M_RD,30 .buf = rbuf, .len = rlen } };31 32 return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;33}34 35static int __maybe_unused i2c_write(struct i2c_adapter *adap, u8 adr,36 u8 *data, int len)37{38 struct i2c_msg msg = { .addr = adr, .flags = 0,39 .buf = data, .len = len };40 41 return (i2c_transfer(adap, &msg, 1) == 1) ? 0 : -1;42}43 44static int __maybe_unused i2c_read(struct i2c_adapter *adapter, u8 adr, u8 *val)45{46 struct i2c_msg msgs[1] = { { .addr = adr, .flags = I2C_M_RD,47 .buf = val, .len = 1 } };48 49 return (i2c_transfer(adapter, msgs, 1) == 1) ? 0 : -1;50}51 52static int __maybe_unused i2c_read_regs(struct i2c_adapter *adapter,53 u8 adr, u8 reg, u8 *val, u8 len)54{55 struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,56 .buf = ®, .len = 1 },57 { .addr = adr, .flags = I2C_M_RD,58 .buf = val, .len = len } };59 60 return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;61}62 63static int __maybe_unused i2c_read_regs16(struct i2c_adapter *adapter,64 u8 adr, u16 reg, u8 *val, u8 len)65{66 u8 msg[2] = { reg >> 8, reg & 0xff };67 struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0,68 .buf = msg, .len = 2 },69 { .addr = adr, .flags = I2C_M_RD,70 .buf = val, .len = len } };71 72 return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;73}74 75static int __maybe_unused i2c_write_reg16(struct i2c_adapter *adap,76 u8 adr, u16 reg, u8 val)77{78 u8 msg[3] = { reg >> 8, reg & 0xff, val };79 80 return i2c_write(adap, adr, msg, 3);81}82 83static int __maybe_unused i2c_write_reg(struct i2c_adapter *adap,84 u8 adr, u8 reg, u8 val)85{86 u8 msg[2] = { reg, val };87 88 return i2c_write(adap, adr, msg, 2);89}90 91static int __maybe_unused i2c_read_reg16(struct i2c_adapter *adapter,92 u8 adr, u16 reg, u8 *val)93{94 return i2c_read_regs16(adapter, adr, reg, val, 1);95}96 97static int __maybe_unused i2c_read_reg(struct i2c_adapter *adapter,98 u8 adr, u8 reg, u8 *val)99{100 return i2c_read_regs(adapter, adr, reg, val, 1);101}102 103#endif /* __DDBRIDGE_I2C_H__ */104