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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <assert.h>
#include <commonlib/bsd/helpers.h>
#include <console/console.h>
#include <device/device.h>
#include <stdlib.h>
#include <string.h>
#include "chip.h"
#define TZ_DEVICE_PATH "\\_TZ"
/* These defaults should be good enough for most systems */
#define DEFAULT_TC1 2
#define DEFAULT_TC2 5
#define DEFAULT_TSP 10
#define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731)
#define SECONDS_TO_DECI_SECONDS(s) ((s) * 10)
static const char *thermal_zone_acpi_name(const struct device *dev)
{
char *name;
if (dev->path.type != DEVICE_PATH_GENERIC)
return NULL;
name = malloc(ACPI_NAME_BUFFER_SIZE);
snprintf(name, ACPI_NAME_BUFFER_SIZE, "TM%02X", dev->path.generic.id);
return name;
}
static void thermal_zone_fill_ssdt(const struct device *dev)
{
struct drivers_acpi_thermal_zone_config *config = config_of(dev);
const char *scope;
const char *name;
assert(dev->path.type == DEVICE_PATH_GENERIC);
if (config->use_acpi1_thermal_zone_scope)
scope = TZ_DEVICE_PATH;
else
scope = acpi_device_scope(dev);
name = acpi_device_name(dev);
assert(name);
assert(scope);
if (!config->temperature_controller) {
printk(BIOS_ERR, "%s: missing temperature_controller\n", dev_path(dev));
return;
}
printk(BIOS_INFO, "%s.%s: %s at %s\n", scope, name, dev->chip_ops->name, dev_path(dev));
acpigen_write_scope(scope);
acpigen_write_thermal_zone(name);
if (config->description)
acpigen_write_name_unicode("_STR", config->description);
if (config->polling_period)
acpigen_write_name_integer(
"_TZP", SECONDS_TO_DECI_SECONDS(config->polling_period));
if (config->critical_temperature)
acpigen_write_name_integer(
"_CRT", CELSIUS_TO_DECI_KELVIN(config->critical_temperature));
if (config->hibernate_temperature)
acpigen_write_name_integer(
"_HOT", CELSIUS_TO_DECI_KELVIN(config->hibernate_temperature));
if (config->passive_config.temperature) {
acpigen_write_name_integer(
"_PSV", CELSIUS_TO_DECI_KELVIN(config->passive_config.temperature));
/*
* The linux kernel currently has an artificial limit of 10 on the number of
* references that can be returned in a list. If we don't respect this limit,
* then the passive threshold won't work.
*
* See https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/third_party/kernel/v5.10/include/acpi/acpi_bus.h;l=19
*/
acpigen_write_processor_package("_PSL", 0, MIN(10, dev_count_cpu()));
acpigen_write_name_integer("_TC1", config->passive_config.time_constant_1
?: DEFAULT_TC1);
acpigen_write_name_integer("_TC2", config->passive_config.time_constant_2
?: DEFAULT_TC2);
acpigen_write_name_integer(
"_TSP",
SECONDS_TO_DECI_SECONDS(config->passive_config.time_sampling_period
?: DEFAULT_TSP));
}
/*
* Method (_TMP) {
* Return (<path>.TMP(<sensor_id>))
* }
*/
acpigen_write_method_serialized("_TMP", 0);
acpigen_emit_byte(RETURN_OP);
acpigen_emit_namestring(acpi_device_path_join(config->temperature_controller, "TMP"));
acpigen_write_integer(config->sensor_id);
acpigen_write_method_end();
acpigen_write_thermal_zone_end();
acpigen_write_scope_end();
}
static struct device_operations thermal_zone_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.acpi_name = thermal_zone_acpi_name,
.acpi_fill_ssdt = thermal_zone_fill_ssdt,
};
static void thermal_zone_enable_dev(struct device *dev)
{
dev->ops = &thermal_zone_ops;
}
struct chip_operations drivers_acpi_thermal_zone_ops = {
.name = "ACPI Thermal Zone",
.enable_dev = thermal_zone_enable_dev,
};
|
