blob: 734fbd5cfb0630fb97f1e5ffeea6f8f390409dfd (
plain)
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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <acpi/acpigen_dsm.h>
/* ------------------- I2C HID DSM ---------------------------- */
#define ACPI_DSM_I2C_HID_UUID "3CDFF6F7-4267-4555-AD05-B30A3D8938DE"
/* I2C HID currently supports revision 1 only, for which, only 1 additional
* function is supported. Thus, the query function should return 0x3:
* bit 0 = additional function supported
* bit 1 = function with index 1 supported
* All other revisions do not support additional functions and hence return 0
*/
static void i2c_hid_func0_cb(void *arg)
{
/* ToInteger (Arg1, Local2) */
acpigen_write_to_integer(ARG1_OP, LOCAL2_OP);
/* If (LEqual (Local2, 0x1)) */
acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x1);
/* Return (Buffer (One) { 0x3 }) */
acpigen_write_return_singleton_buffer(0x3);
/* Else */
acpigen_write_else();
/* Return (Buffer (One) { 0x0 }) */
acpigen_write_return_singleton_buffer(0x0);
acpigen_pop_len(); /* Pop : Else */
}
static void i2c_hid_func1_cb(void *arg)
{
struct dsm_i2c_hid_config *config = arg;
acpigen_write_return_byte(config->hid_desc_reg_offset);
}
static void (*i2c_hid_callbacks[2])(void *) = {
i2c_hid_func0_cb,
i2c_hid_func1_cb,
};
void acpigen_write_dsm_i2c_hid(struct dsm_i2c_hid_config *config)
{
acpigen_write_dsm(ACPI_DSM_I2C_HID_UUID, i2c_hid_callbacks,
ARRAY_SIZE(i2c_hid_callbacks), config);
}
/* ------------------- End: I2C HID DSM ------------------------- */
|
