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git01.mediatek.com / filogic / atf / 92de80ab22193f61ae0207a0b138282149f91850 / . / include / drivers / brcm / i2c / i2c.h
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Bharat Gooty66b0bb42020-09-24 12:29:00 +0530[diff] [blame]1/*
2 * Copyright (c) 2016 - 2021, Broadcom
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7#ifndef I2C_H
8#define I2C_H
9
10#include <stdint.h>
11
12#define I2C_SPEED_100KHz 100000
13#define I2C_SPEED_400KHz 400000
14#define I2C_SPEED_DEFAULT I2C_SPEED_100KHz
15
16/*
17 * Function Name: i2c_probe
18 *
19 * Description:
20 * This function probes the I2C bus for the existence of the specified
21 * device.
22 *
23 * Parameters:
24 * bus_id - I2C bus ID
25 * devaddr - Device Address
26 *
27 * Return:
28 * 0 on success, or -1 on failure.
29 */
30int i2c_probe(uint32_t bus_id, uint8_t devaddr);
31
32/*
33 * Function Name: i2c_init
34 *
35 * Description:
36 * This function initializes the SMBUS.
37 *
38 * Parameters:
39 * bus_id - I2C bus ID
40 * speed - I2C bus speed in Hz
41 *
42 * Return:
43 * 0 on success, or -1 on failure.
44 */
45int i2c_init(uint32_t bus_id, int speed);
46
47/*
48 * Function Name: i2c_set_bus_speed
49 *
50 * Description:
51 * This function configures the SMBUS speed
52 *
53 * Parameters:
54 * bus_id - I2C bus ID
55 * speed - I2C bus speed in Hz
56 *
57 * Return:
58 * 0 on success, or -1 on failure.
59 */
60int i2c_set_bus_speed(uint32_t bus_id, uint32_t speed);
61
62/*
63 * Function Name: i2c_get_bus_speed
64 *
65 * Description:
66 * This function returns the SMBUS speed.
67 *
68 * Parameters:
69 * bus_id - I2C bus ID
70 *
71 * Return:
72 * Bus speed in Hz, 0 on failure
73 */
74uint32_t i2c_get_bus_speed(uint32_t bus_id);
75
76/*
77 * Function Name: i2c_recv_byte
78 *
79 * Description:
80 * This function reads I2C data from a device without specifying
81 * a command regsiter.
82 *
83 * Parameters:
84 * bus_id - I2C bus ID
85 * devaddr - Device Address
86 * value - Data Read
87 *
88 * Return:
89 * 0 on success, or -1 on failure.
90 */
91int i2c_recv_byte(uint32_t bus_id, uint8_t devaddr, uint8_t *value);
92
93/*
94 * Function Name: i2c_send_byte
95 *
96 * Description:
97 * This function send I2C data to a device without specifying
98 * a command regsiter.
99 *
100 * Parameters:
101 * bus_id - I2C bus ID
102 * devaddr - Device Address
103 * value - Data Send
104 *
105 * Return:
106 * 0 on success, or -1 on failure.
107 */
108int i2c_send_byte(uint32_t bus_id, uint8_t devaddr, uint8_t value);
109
110/*
111 * Function Name: i2c_read
112 *
113 * Description:
114 * This function reads I2C data from a device with a designated
115 * command register
116 *
117 * Parameters:
118 * bus_id - I2C bus ID
119 * devaddr - Device Address
120 * addr - Register Offset
121 * alen - Address Length, 1 for byte, 2 for word (not supported)
122 * buffer - Data Buffer
123 * len - Data Length in bytes
124 *
125 * Return:
126 * 0 on success, or -1 on failure.
127 */
128int i2c_read(uint32_t bus_id,
129 uint8_t devaddr,
130 uint32_t addr,
131 int alen,
132 uint8_t *buffer,
133 int len);
134
135/*
136 * Function Name: i2c_write
137 *
138 * Description:
139 * This function write I2C data to a device with a designated
140 * command register
141 *
142 * Parameters:
143 * bus_id - I2C bus ID
144 * devaddr - Device Address
145 * addr - Register Offset
146 * alen - Address Length, 1 for byte, 2 for word (not supported)
147 * buffer - Data Buffer
148 * len - Data Length in bytes
149 *
150 * Return:
151 * 0 on success, or -1 on failure.
152 */
153int i2c_write(uint32_t bus_id,
154 uint8_t devaddr,
155 uint32_t addr,
156 int alen,
157 uint8_t *buffer,
158 int len);
159
160
161#endif /* I2C_H */