1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Cros Board Info
*/
#include "common.h"
#include "console.h"
#include "crc8.h"
#include "cros_board_info.h"
#include "host_command.h"
#include "i2c.h"
#include "util.h"
#define CPRINTS(format, args...) cprints(CC_SYSTEM, "CBI " format, ## args)
static struct board_info bi;
/* TODO: Init it to -1. On error (I2C or bad contents), retry a read and set it
* to enum ec_error_list if it still fails. The successive calls can be
* immediately returned with the cached error code. This will avoid attempting
* reads doomed to fail. */
static int initialized;
static uint8_t cbi_crc8(const struct board_info *bi)
{
return crc8((uint8_t *)&bi->head.crc + 1, bi->head.total_size - 4);
}
/*
* Get board information from EEPROM
*/
static int read_board_info(void)
{
uint8_t buf[256];
uint8_t offset;
if (initialized)
return EC_SUCCESS;
CPRINTS("Reading board info");
/* Read header */
offset = 0;
if (i2c_xfer(I2C_PORT_EEPROM, I2C_ADDR_EEPROM,
&offset, 1, buf, sizeof(bi.head), I2C_XFER_SINGLE)) {
CPRINTS("Failed to read header");
return EC_ERROR_INVAL;
}
memcpy(&bi.head, buf, sizeof(bi.head));
/* Check magic */
if (memcmp(bi.head.magic, cbi_magic, sizeof(bi.head.magic))) {
CPRINTS("Bad magic");
return EC_ERROR_INVAL;
}
/* check version */
if (bi.head.major_version > CBI_VERSION_MAJOR) {
CPRINTS("Version mismatch");
return EC_ERROR_INVAL;
}
/* Check the data size. It's expected to support up to 64k but our
* buffer has practical limitation. */
if (bi.head.total_size < sizeof(bi) ||
bi.head.total_size > sizeof(buf)) {
CPRINTS("Bad size: %d", bi.head.total_size);
return EC_ERROR_OVERFLOW;
}
/* Read the rest */
offset = sizeof(bi.head);
if (i2c_xfer(I2C_PORT_EEPROM, I2C_ADDR_EEPROM, &offset, 1,
buf + sizeof(bi.head),
bi.head.total_size - sizeof(bi.head),
I2C_XFER_SINGLE)) {
CPRINTS("Failed to read body");
return EC_ERROR_INVAL;
}
/* Check CRC. This supports new fields unknown to this parser. */
if (cbi_crc8((struct board_info *)&buf) != bi.head.crc) {
CPRINTS("Bad CRC");
return EC_ERROR_INVAL;
}
/* Save only the data we understand. */
memcpy(&bi.head + 1, &buf[sizeof(bi.head)],
sizeof(bi) - sizeof(bi.head));
/* If we're handling previous version, clear all new fields */
initialized = 1;
return EC_SUCCESS;
}
int cbi_get_board_version(uint32_t *version)
{
if (read_board_info())
return EC_ERROR_UNKNOWN;
*version = bi.version;
return EC_SUCCESS;
}
int cbi_get_sku_id(uint32_t *sku_id)
{
if (read_board_info())
return EC_ERROR_UNKNOWN;
*sku_id = bi.sku_id;
return EC_SUCCESS;
}
int cbi_get_oem_id(uint32_t *oem_id)
{
if (read_board_info())
return EC_ERROR_UNKNOWN;
*oem_id = bi.oem_id;
return EC_SUCCESS;
}
int board_get_version(void)
{
uint32_t version;
if (cbi_get_board_version(&version))
return -1;
return version;
}
static int hc_cbi_get(struct host_cmd_handler_args *args)
{
const struct __ec_align4 ec_params_get_cbi *p = args->params;
if (read_board_info())
return EC_RES_ERROR;
switch (p->type) {
case CBI_DATA_BOARD_VERSION:
*(uint32_t *)args->response = bi.version;
break;
case CBI_DATA_OEM_ID:
*(uint32_t *)args->response = bi.oem_id;
break;
case CBI_DATA_SKU_ID:
*(uint32_t *)args->response = bi.sku_id;
break;
default:
return EC_RES_INVALID_PARAM;
}
args->response_size = sizeof(uint32_t);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GET_CROS_BOARD_INFO,
hc_cbi_get,
EC_VER_MASK(0));
|
