RTEMS 6.1-rc7
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i2c.h
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1/* SPDX-License-Identifier: BSD-2-Clause */
2
11/*
12 * Copyright (c) 2014 embedded brains GmbH & Co. KG
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#ifndef _UAPI_LINUX_I2C_H
37#define _UAPI_LINUX_I2C_H
38
39#include <stdint.h>
40
72#define I2C_M_TEN 0x0010
73
79#define I2C_M_RD 0x0001
80
90#define I2C_M_STOP 0x8000
91
100#define I2C_M_NOSTART 0x4000
101
110#define I2C_M_REV_DIR_ADDR 0x2000
111
120#define I2C_M_IGNORE_NAK 0x1000
121
131#define I2C_M_NO_RD_ACK 0x0800
132
144#define I2C_M_RECV_LEN 0x0400
145
151struct i2c_msg {
158 uint16_t addr;
159
173 uint16_t flags;
174
178 uint16_t len;
179
183 uint8_t *buf;
184};
185
192#define I2C_FUNC_I2C 0x00000001
193#define I2C_FUNC_10BIT_ADDR 0x00000002
194#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004
195#define I2C_FUNC_SMBUS_PEC 0x00000008
196#define I2C_FUNC_NOSTART 0x00000010
197#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000
198#define I2C_FUNC_SMBUS_QUICK 0x00010000
199#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
200#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
201#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
202#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
203#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
204#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
205#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
206#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
207#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
208#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000
209#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000
210
211#define I2C_FUNC_SMBUS_BYTE \
212 (I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE)
213
214#define I2C_FUNC_SMBUS_BYTE_DATA \
215 (I2C_FUNC_SMBUS_READ_BYTE_DATA | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
216
217#define I2C_FUNC_SMBUS_WORD_DATA \
218 (I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA)
219
220#define I2C_FUNC_SMBUS_BLOCK_DATA \
221 (I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
222
223#define I2C_FUNC_SMBUS_I2C_BLOCK \
224 (I2C_FUNC_SMBUS_READ_I2C_BLOCK | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
225
226#define I2C_FUNC_SMBUS_EMUL \
227 (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA \
228 | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL \
229 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | I2C_FUNC_SMBUS_I2C_BLOCK \
230 | I2C_FUNC_SMBUS_PEC)
231
237#define I2C_SMBUS_BLOCK_MAX 32
238
243 uint8_t byte;
244 uint16_t word;
245 uint8_t block[I2C_SMBUS_BLOCK_MAX + 2];
246};
247
254#define I2C_SMBUS_READ 1
255
256#define I2C_SMBUS_WRITE 0
257
266#define I2C_SMBUS_QUICK 0
267
268#define I2C_SMBUS_BYTE 1
269
270#define I2C_SMBUS_BYTE_DATA 2
271
272#define I2C_SMBUS_WORD_DATA 3
273
274#define I2C_SMBUS_PROC_CALL 4
275
276#define I2C_SMBUS_BLOCK_DATA 5
277
278#define I2C_SMBUS_I2C_BLOCK_BROKEN 6
279
280#define I2C_SMBUS_BLOCK_PROC_CALL 7
281
282#define I2C_SMBUS_I2C_BLOCK_DATA 8
283
288#endif /* _UAPI_LINUX_I2C_H */
#define I2C_SMBUS_BLOCK_MAX
Maximum SMBus data block count.
Definition: i2c.h:237
I2C transfer message.
Definition: i2c.h:151
uint16_t len
The message data length in bytes.
Definition: i2c.h:178
uint16_t flags
The message flags.
Definition: i2c.h:173
uint8_t * buf
Pointer to the message data.
Definition: i2c.h:183
uint16_t addr
The slave address.
Definition: i2c.h:158
SMBus data.
Definition: i2c.h:242