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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* Copyright 2021 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.
*/
#include <drivers/cros_cbi.h>
#include "cros_board_info.h"
#include <logging/log.h>
LOG_MODULE_REGISTER(cros_cbi, LOG_LEVEL_ERR);
/* CBI SSFC part */
/* This part of the driver is about CBI SSFC part.
* Actually, two "compatible" values are handle here -
* named_cbi_ssfc_value and named_cbi_ssfc. named_cbi_ssfc_value nodes are
* grandchildren of the named_cbi_ssfc node. named_cbi_ssfc_value is introduced
* to iterate over grandchildren of the named_cbi_ssfc(macro
* DT_FOREACH_CHILD can not be nested) and it can be pointed by a sensor dts to
* indicate alternative usage.
*/
#define DT_DRV_COMPAT named_cbi_ssfc_value
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(named_cbi_ssfc) < 2,
"More than 1 CBI SSFS node");
#define CBI_SSFC_NODE DT_INST(0, named_cbi_ssfc)
#define CBI_SSFC_INIT_DEFAULT_ID(id) \
do { \
if (DT_PROP(id, default)) { \
cached_ssfc.CBI_SSFC_UNION_ENTRY_NAME(DT_PARENT(id)) = \
DT_PROP(id, value); \
} \
} while (0);
#define CBI_SSFC_INIT_DEFAULT(inst) CBI_SSFC_INIT_DEFAULT_ID(DT_DRV_INST(inst))
#define CBI_SSFC_VALUE_ARRAY_ID(id) \
[CBI_SSFC_VALUE_ID(id)] = DT_PROP(id, value),
#define CBI_SSFC_VALUE_ARRAY(inst) CBI_SSFC_VALUE_ARRAY_ID(DT_DRV_INST(inst))
#define CBI_SSFC_VALUE_BUILD_ASSERT(inst) \
BUILD_ASSERT(DT_INST_PROP(inst, value) <= UINT8_MAX, \
"CBI SSFS value too big");
#define CBI_SSFC_PARENT_VALUE_CASE_GENERATE(value_id, value_parent) \
case value_id: \
return value_parent;
#define CBI_SSFC_PARENT_VALUE_CASE_ID(id) \
CBI_SSFC_PARENT_VALUE_CASE_GENERATE( \
CBI_SSFC_VALUE_ID(id), \
cached_ssfc.CBI_SSFC_UNION_ENTRY_NAME(DT_PARENT(id)))
#define CBI_SSFC_PARENT_VALUE_CASE(inst) \
CBI_SSFC_PARENT_VALUE_CASE_ID(DT_DRV_INST(inst))
#define CBI_SSFC_UNION_ENTRY_NAME(id) DT_CAT(cbi_ssfc_, id)
#define CBI_SSFC_UNION_ENTRY(id) \
uint32_t CBI_SSFC_UNION_ENTRY_NAME(id) \
: DT_PROP(id, size);
#define CBI_SSFC_PLUS_FIELD_SIZE(id) +DT_PROP(id, size)
#define CBI_SSFC_FIELDS_SIZE \
(0 COND_CODE_1( \
DT_NODE_EXISTS(CBI_SSFC_NODE), \
(DT_FOREACH_CHILD(CBI_SSFC_NODE, CBI_SSFC_PLUS_FIELD_SIZE)), \
()))
BUILD_ASSERT(CBI_SSFC_FIELDS_SIZE <= 32, "CBI SSFS is bigger than 32 bits");
/*
* Define union bit fields based on the device tree entries. Example:
* cbi-ssfc {
* compatible = "named-cbi-ssfc";
*
* base_sensor {
* enum-name = "BASE_SENSOR";
* size = <3>;
* bmi160 {
* compatible = "named-cbi-ssfc-value";
* status = "okay";
* value = <1>;
* };
* };
* lid_sensor {
* enum-name = "LID_SENSOR";
* size = <3>;
* bma255 {
* compatible = "named-cbi-ssfc-value";
* status = "okay";
* value = <1>;
* };
* };
* lightbar {
* enum-name = "LIGHTBAR";
* size = <2>;
* 10_led {
* compatible = "named-cbi-ssfc-value";
* status = "okay";
* value = <1>;
* };
* };
* };
* Should be converted into
* union cbi_ssfc {
* struct {
* uint32_t cbi_ssfc_DT_N_S_cbi_ssfc_S_base_sensor:3
* uint32_t cbi_ssfc_DT_N_S_cbi_ssfc_S_lid_sensor:3
* uint32_t cbi_ssfc_DT_N_S_cbi_ssfc_S_lightbar:2
* uint32_t reserved : 24;
* };
* uint32_t raw_value;
* };
*/
union cbi_ssfc {
struct {
#if DT_NODE_EXISTS(CBI_SSFC_NODE)
DT_FOREACH_CHILD(CBI_SSFC_NODE, CBI_SSFC_UNION_ENTRY)
uint32_t reserved : (32 - CBI_SSFC_FIELDS_SIZE);
#endif
};
uint32_t raw_value;
};
BUILD_ASSERT(sizeof(union cbi_ssfc) == sizeof(uint32_t),
"CBI SSFS structure exceedes 32 bits");
DT_INST_FOREACH_STATUS_OKAY(CBI_SSFC_VALUE_BUILD_ASSERT)
static const uint8_t ssfc_values[] = {
DT_INST_FOREACH_STATUS_OKAY(CBI_SSFC_VALUE_ARRAY)
};
static union cbi_ssfc cached_ssfc __attribute__((unused));
/* CBI SSFC part end */
/* Device config */
struct cros_cbi_config {
/* SSFC values for specific configs */
const uint8_t *ssfc_values;
};
/* Device data */
struct cros_cbi_data {
/* Cached SSFC configs */
union cbi_ssfc cached_ssfc;
};
/* CBI SSFC part */
static void cros_cbi_ssfc_init(const struct device *dev)
{
struct cros_cbi_data *data = (struct cros_cbi_data *)(dev->data);
if (cbi_get_ssfc(&data->cached_ssfc.raw_value) != EC_SUCCESS) {
DT_INST_FOREACH_STATUS_OKAY(CBI_SSFC_INIT_DEFAULT)
}
LOG_INF("Read CBI SSFC : 0x%08X\n", data->cached_ssfc.raw_value);
}
static uint32_t cros_cbi_ssfc_get_parent_field_value(union cbi_ssfc cached_ssfc,
enum cbi_ssfc_value_id value_id)
{
switch (value_id) {
DT_INST_FOREACH_STATUS_OKAY(CBI_SSFC_PARENT_VALUE_CASE)
default:
LOG_ERR("CBI SSFC parent field value not found: %d\n",
value_id);
return 0;
}
}
static int cros_cbi_ec_ssfc_check_match(const struct device *dev,
enum cbi_ssfc_value_id value_id)
{
struct cros_cbi_data *data = (struct cros_cbi_data *)(dev->data);
struct cros_cbi_config *cfg = (struct cros_cbi_config *)(dev->config);
return cros_cbi_ssfc_get_parent_field_value(data->cached_ssfc,
value_id) ==
cfg->ssfc_values[value_id];
}
/* CBI SSFC part end */
#undef DT_DRV_COMPAT
static int cros_cbi_ec_init(const struct device *dev)
{
cros_cbi_ssfc_init(dev);
return 0;
}
/* cros ec cbi driver registration */
static const struct cros_cbi_driver_api cros_cbi_driver_api = {
.init = cros_cbi_ec_init,
.ssfc_check_match = cros_cbi_ec_ssfc_check_match,
};
static int cbi_init(const struct device *dev)
{
ARG_UNUSED(dev);
return 0;
}
static const struct cros_cbi_config cros_cbi_cfg = {
.ssfc_values = ssfc_values,
};
static struct cros_cbi_data cros_cbi_data;
DEVICE_DEFINE(cros_cbi, CROS_CBI_LABEL, cbi_init, NULL, &cros_cbi_data,
&cros_cbi_cfg, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
&cros_cbi_driver_api);
|
