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
|
// SPDX-License-Identifier: 0BSD
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mfd/core.h>
#include "dchu.h"
static const u8 dchu_uuid_def[16] = {
0xE4,0x24,0xF2,0x93, 0xDC,0xFB, 0xBF,0x4B,
0xAD,0xD6,0xDB,0x71, 0xBD,0xC0,0xAF,0xAD
};
static struct platform_device *dchu_parent;
static struct dchu *dchu_core;
int dchu_call_dsm(struct dchu *core, u64 function,
const u8 *payload, u32 payload_len,
union acpi_object **out_obj)
{
union acpi_object args[4];
struct acpi_object_list input;
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
union acpi_object *obj;
if (!core || !core->handle)
return -ENODEV;
args[0].type = ACPI_TYPE_BUFFER;
args[0].buffer.length = sizeof(core->uuid);
args[0].buffer.pointer = core->uuid;
args[1].type = ACPI_TYPE_INTEGER;
args[1].integer.value = core->rev;
args[2].type = ACPI_TYPE_INTEGER;
args[2].integer.value = function;
if (payload && payload_len) {
union acpi_object elem;
elem.type = ACPI_TYPE_BUFFER;
elem.buffer.length = payload_len;
elem.buffer.pointer = (u8 *)payload;
args[3].type = ACPI_TYPE_PACKAGE;
args[3].package.count = 1;
args[3].package.elements = &elem;
input.count = 4;
input.pointer = args;
status = acpi_evaluate_object(core->handle, "_DSM", &input, &output);
} else {
args[3].type = ACPI_TYPE_PACKAGE;
args[3].package.count = 0;
args[3].package.elements = NULL;
input.count = 4;
input.pointer = args;
status = acpi_evaluate_object(core->handle, "_DSM", &input, &output);
}
if (ACPI_FAILURE(status))
return -EIO;
obj = output.pointer;
if (!obj)
return -EIO;
if (out_obj) {
*out_obj = obj; /* caller must kfree() */
return 0;
}
kfree(obj);
return 0;
}
EXPORT_SYMBOL_GPL(dchu_call_dsm);
static int __init dchu_core_init(void)
{
struct acpi_device *adev;
int ret;
/* Require ACPI HID CLV0001 */
adev = acpi_dev_get_first_match_dev("CLV0001", NULL, -1);
if (!adev) {
pr_info("dchu-core: ACPI HID CLV0001 not present\n");
return -ENODEV;
}
dchu_core = kzalloc(sizeof(*dchu_core), GFP_KERNEL);
if (!dchu_core) {
ret = -ENOMEM;
goto put_adev;
}
dchu_core->dev = &adev->dev;
dchu_core->handle = adev->handle;
memcpy(dchu_core->uuid, dchu_uuid_def, sizeof(dchu_core->uuid));
dchu_core->rev = 1;
/* Parent platform device for MFD children */
dchu_parent = platform_device_alloc("dchu", PLATFORM_DEVID_NONE);
if (!dchu_parent) {
ret = -ENOMEM;
goto free_core;
}
ACPI_COMPANION_SET(&dchu_parent->dev, adev);
ret = platform_device_add(dchu_parent);
if (ret)
goto put_parent;
/* Create children: dchu-hwmon and dchu-leds */
{
struct dchu_cell_pdata pdata1 = { .core = dchu_core };
struct dchu_cell_pdata pdata2 = { .core = dchu_core };
struct mfd_cell cells[2] = { 0 };
cells[0].name = "dchu-hwmon";
cells[0].platform_data = &pdata1;
cells[0].pdata_size = sizeof(pdata1);
cells[1].name = "dchu-leds";
cells[1].platform_data = &pdata2;
cells[1].pdata_size = sizeof(pdata2);
ret = mfd_add_devices(&dchu_parent->dev, 0, cells, ARRAY_SIZE(cells),
NULL, 0, NULL);
if (ret)
goto del_parent;
}
acpi_dev_put(adev);
pr_info("dchu-core: registered with MFD children\n");
return 0;
del_parent:
platform_device_del(dchu_parent);
put_parent:
platform_device_put(dchu_parent);
dchu_parent = NULL;
free_core:
kfree(dchu_core);
dchu_core = NULL;
put_adev:
acpi_dev_put(adev);
return ret;
}
static void __exit dchu_core_exit(void)
{
if (dchu_parent) {
mfd_remove_devices(&dchu_parent->dev);
platform_device_unregister(dchu_parent);
dchu_parent = NULL;
}
kfree(dchu_core);
dchu_core = NULL;
pr_info("dchu-core: unloaded\n");
}
module_init(dchu_core_init);
module_exit(dchu_core_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Insyde DCHU protocol implementation");
MODULE_AUTHOR("stdpi <iam@stdpi.work>");
|