1 /*
2 * Copyright (c) 2013-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_I2C_H_
28 #define _LINUX_I2C_H_
29
30 #include <linux/mod_devicetable.h>
31 #include <linux/device.h> /* for struct device */
32 #include <linux/sched.h> /* for completion */
33 #include <linux/mutex.h>
34 #include <linux/of.h> /* for struct device_node */
35 #include <uapi/linux/i2c.h>
36
37 #include <bus/iicbus/iic.h>
38
39 #define I2C_M_RD IIC_M_RD
40 #define I2C_M_NOSTART IIC_M_NOSTART
41
42 struct i2c_lock_operations;
43
44 struct i2c_adapter {
45 const struct i2c_algorithm *algo;
46 void *algo_data;
47
48 int timeout;
49 int retries;
50 struct device dev;
51 void *private_data;
52
53 char name[48];
54
55 const struct i2c_lock_operations *lock_ops;
56 };
57
58 struct i2c_client {
59 unsigned short flags;
60 unsigned short addr;
61 char name[I2C_NAME_SIZE];
62 struct i2c_adapter *adapter;
63 };
64
65 int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
66 int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
67
68 struct i2c_algorithm {
69 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
70 int num);
71
72 u32 (*functionality) (struct i2c_adapter *);
73 };
74
75 extern int i2c_add_adapter(struct i2c_adapter *);
76 extern void i2c_del_adapter(struct i2c_adapter *);
77
78 static inline void
i2c_set_adapdata(struct i2c_adapter * dev,void * data)79 i2c_set_adapdata(struct i2c_adapter *dev, void *data)
80 {
81 dev->private_data = data;
82 }
83
84 static inline void *
i2c_get_adapdata(const struct i2c_adapter * dev)85 i2c_get_adapdata(const struct i2c_adapter *dev)
86 {
87 return dev->private_data;
88 }
89
90 struct i2c_board_info {
91 char type[I2C_NAME_SIZE];
92 unsigned short addr;
93 };
94
95 struct i2c_client *
96 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
97
98 #define I2C_LOCK_SEGMENT BIT(1)
99
100 struct i2c_lock_operations {
101 void (*lock_bus)(struct i2c_adapter *, unsigned int flags);
102 int (*trylock_bus)(struct i2c_adapter *, unsigned int flags);
103 void (*unlock_bus)(struct i2c_adapter *, unsigned int flags);
104 };
105
106 #endif /* _LINUX_I2C_H_ */
107