1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * ddbridge-i2c.h: Digital Devices bridge i2c driver
4 *
5 * Copyright (C) 2010-2017 Digital Devices GmbH
6 * 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
19 void ddb_i2c_release(struct ddb *dev);
20 int ddb_i2c_init(struct ddb *dev);
21
22 /******************************************************************************/
23
i2c_io(struct i2c_adapter * adapter,u8 adr,u8 * wbuf,u32 wlen,u8 * rbuf,u32 rlen)24 static 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
i2c_write(struct i2c_adapter * adap,u8 adr,u8 * data,int len)35 static 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
i2c_read(struct i2c_adapter * adapter,u8 adr,u8 * val)44 static 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
i2c_read_regs(struct i2c_adapter * adapter,u8 adr,u8 reg,u8 * val,u8 len)52 static 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
i2c_read_regs16(struct i2c_adapter * adapter,u8 adr,u16 reg,u8 * val,u8 len)63 static 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
i2c_write_reg16(struct i2c_adapter * adap,u8 adr,u16 reg,u8 val)75 static 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
i2c_write_reg(struct i2c_adapter * adap,u8 adr,u8 reg,u8 val)83 static 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
i2c_read_reg16(struct i2c_adapter * adapter,u8 adr,u16 reg,u8 * val)91 static 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
i2c_read_reg(struct i2c_adapter * adapter,u8 adr,u8 reg,u8 * val)97 static 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