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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _I2C_HID_ACPI_H
#define _I2C_HID_ACPI_H
#include <linux/acpi.h>
#include <linux/uuid.h>
static inline int i2c_hid_acpi_get_descriptor(struct acpi_device *adev)
{
/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
static const guid_t i2c_hid_guid =
GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
acpi_handle handle = acpi_device_handle(adev);
union acpi_object *obj;
u16 addr;
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid,
1, 1, NULL, ACPI_TYPE_INTEGER);
if (!obj) {
acpi_handle_err(handle,
"Error _DSM call to get HID descriptor address failed\n");
return -ENODEV;
}
addr = obj->integer.value;
ACPI_FREE(obj);
return addr;
}
#endif
|
