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
|
/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/acpi_device.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
static struct acpi_dp *gpio_keys_add_child_node(
struct drivers_generic_gpio_keys_config *config,
const char *parent_path)
{
struct key_info *key = &config->key;
struct acpi_dp *dsd;
if (!key->dev_name || !key->linux_code)
return NULL;
dsd = acpi_dp_new_table(config->key.dev_name);
acpi_dp_add_integer(dsd, "linux,code", key->linux_code);
if (key->linux_input_type)
acpi_dp_add_integer(dsd, "linux,input-type",
key->linux_input_type);
if (key->label)
acpi_dp_add_string(dsd, "label", key->label);
if (key->wake) {
acpi_dp_add_integer(dsd, "wakeup-source", 1);
acpigen_write_PRW(key->wake, 3);
acpi_dp_add_integer(dsd, "wakeup-event-action",
key->wakeup_event_action);
}
if (key->can_be_disabled)
acpi_dp_add_integer(dsd, "linux,can-disable",
key->can_be_disabled);
if (key->debounce_interval)
acpi_dp_add_integer(dsd, "debounce-interval",
key->debounce_interval);
acpi_dp_add_gpio(dsd, "gpios", parent_path, 0, 0,
config->gpio.polarity);
return dsd;
}
static void gpio_keys_fill_ssdt_generator(struct device *dev)
{
struct drivers_generic_gpio_keys_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
const char *path = acpi_device_path(dev);
struct acpi_dp *dsd, *child;
const char *drv_string = config->is_polled ? "gpio-keys-polled"
: "gpio-keys";
if (!dev->enabled || !scope || !path || !config->gpio.pin_count)
return;
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
/* _HID is set to PRP0001 */
acpigen_write_name_string("_HID", ACPI_DT_NAMESPACE_HID);
/* Resources - _CRS */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_gpio(&config->gpio);
acpigen_write_resourcetemplate_footer();
/* DSD */
dsd = acpi_dp_new_table("_DSD");
acpi_dp_add_string(dsd, "compatible", drv_string);
if (config->is_polled)
acpi_dp_add_integer(dsd, "poll-interval",
config->poll_interval);
/* Child device defining key */
child = gpio_keys_add_child_node(config, path);
if (child)
acpi_dp_add_child(dsd, "button-0", child);
acpi_dp_write(dsd);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
}
static const char *gpio_keys_acpi_name(const struct device *dev)
{
struct drivers_generic_gpio_keys_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "K%03.3X", config->gpio.pins[0]);
name[4] = '\0';
return name;
}
static struct device_operations gpio_keys_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.acpi_name = gpio_keys_acpi_name,
.acpi_fill_ssdt_generator = gpio_keys_fill_ssdt_generator,
};
static void gpio_keys_enable(struct device *dev)
{
dev->ops = &gpio_keys_ops;
}
struct chip_operations drivers_generic_gpio_keys_ops = {
CHIP_NAME("GPIO Keys")
.enable_dev = gpio_keys_enable
};
|
