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93198b6c CM |
1 | /* |
2 | * QEMU SMBus host (master) emulation. | |
3 | * | |
4 | * This code emulates SMBus transactions from the master point of view, | |
5 | * it runs the individual I2C transaction to do the SMBus protocol | |
6 | * over I2C. | |
7 | * | |
8 | * Copyright (c) 2007 CodeSourcery. | |
9 | * Written by Paul Brook | |
10 | * | |
11 | * This code is licensed under the LGPL. | |
12 | */ | |
13 | ||
14 | #include "qemu/osdep.h" | |
93198b6c CM |
15 | #include "hw/i2c/i2c.h" |
16 | #include "hw/i2c/smbus_master.h" | |
17 | ||
18 | /* Master device commands. */ | |
19 | int smbus_quick_command(I2CBus *bus, uint8_t addr, int read) | |
20 | { | |
21 | if (i2c_start_transfer(bus, addr, read)) { | |
22 | return -1; | |
23 | } | |
24 | i2c_end_transfer(bus); | |
25 | return 0; | |
26 | } | |
27 | ||
28 | int smbus_receive_byte(I2CBus *bus, uint8_t addr) | |
29 | { | |
30 | uint8_t data; | |
31 | ||
32 | if (i2c_start_transfer(bus, addr, 1)) { | |
33 | return -1; | |
34 | } | |
35 | data = i2c_recv(bus); | |
36 | i2c_nack(bus); | |
37 | i2c_end_transfer(bus); | |
38 | return data; | |
39 | } | |
40 | ||
41 | int smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data) | |
42 | { | |
43 | if (i2c_start_transfer(bus, addr, 0)) { | |
44 | return -1; | |
45 | } | |
46 | i2c_send(bus, data); | |
47 | i2c_end_transfer(bus); | |
48 | return 0; | |
49 | } | |
50 | ||
51 | int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command) | |
52 | { | |
53 | uint8_t data; | |
54 | if (i2c_start_transfer(bus, addr, 0)) { | |
55 | return -1; | |
56 | } | |
57 | i2c_send(bus, command); | |
58 | if (i2c_start_transfer(bus, addr, 1)) { | |
59 | i2c_end_transfer(bus); | |
60 | return -1; | |
61 | } | |
62 | data = i2c_recv(bus); | |
63 | i2c_nack(bus); | |
64 | i2c_end_transfer(bus); | |
65 | return data; | |
66 | } | |
67 | ||
68 | int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data) | |
69 | { | |
70 | if (i2c_start_transfer(bus, addr, 0)) { | |
71 | return -1; | |
72 | } | |
73 | i2c_send(bus, command); | |
74 | i2c_send(bus, data); | |
75 | i2c_end_transfer(bus); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command) | |
80 | { | |
81 | uint16_t data; | |
82 | if (i2c_start_transfer(bus, addr, 0)) { | |
83 | return -1; | |
84 | } | |
85 | i2c_send(bus, command); | |
86 | if (i2c_start_transfer(bus, addr, 1)) { | |
87 | i2c_end_transfer(bus); | |
88 | return -1; | |
89 | } | |
90 | data = i2c_recv(bus); | |
91 | data |= i2c_recv(bus) << 8; | |
92 | i2c_nack(bus); | |
93 | i2c_end_transfer(bus); | |
94 | return data; | |
95 | } | |
96 | ||
97 | int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data) | |
98 | { | |
99 | if (i2c_start_transfer(bus, addr, 0)) { | |
100 | return -1; | |
101 | } | |
102 | i2c_send(bus, command); | |
103 | i2c_send(bus, data & 0xff); | |
104 | i2c_send(bus, data >> 8); | |
105 | i2c_end_transfer(bus); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, | |
110 | int len, bool recv_len, bool send_cmd) | |
111 | { | |
112 | int rlen; | |
113 | int i; | |
114 | ||
115 | if (send_cmd) { | |
116 | if (i2c_start_transfer(bus, addr, 0)) { | |
117 | return -1; | |
118 | } | |
119 | i2c_send(bus, command); | |
120 | } | |
121 | if (i2c_start_transfer(bus, addr, 1)) { | |
122 | if (send_cmd) { | |
123 | i2c_end_transfer(bus); | |
124 | } | |
125 | return -1; | |
126 | } | |
127 | if (recv_len) { | |
128 | rlen = i2c_recv(bus); | |
129 | } else { | |
130 | rlen = len; | |
131 | } | |
132 | if (rlen > len) { | |
133 | rlen = 0; | |
134 | } | |
135 | for (i = 0; i < rlen; i++) { | |
136 | data[i] = i2c_recv(bus); | |
137 | } | |
138 | i2c_nack(bus); | |
139 | i2c_end_transfer(bus); | |
140 | return rlen; | |
141 | } | |
142 | ||
143 | int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, | |
144 | int len, bool send_len) | |
145 | { | |
146 | int i; | |
147 | ||
148 | if (len > 32) { | |
149 | len = 32; | |
150 | } | |
151 | ||
152 | if (i2c_start_transfer(bus, addr, 0)) { | |
153 | return -1; | |
154 | } | |
155 | i2c_send(bus, command); | |
156 | if (send_len) { | |
157 | i2c_send(bus, len); | |
158 | } | |
159 | for (i = 0; i < len; i++) { | |
160 | i2c_send(bus, data[i]); | |
161 | } | |
162 | i2c_end_transfer(bus); | |
163 | return 0; | |
164 | } |