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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | /* * 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__ */ |