| /* |
| * ddbridge-i2c.c: 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__ */ |
