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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* TI LM74 temperature sensor driver
*
* Copyright (C) 2024 CS GROUP France
*
*/
#include <dm.h>
#include <thermal.h>
#include <spi.h>
static int ti_lm74_get_temp(struct udevice *dev, int *temp)
{
char buf[2];
s16 raw;
int ret;
ret = dm_spi_claim_bus(dev);
if (ret)
return ret;
ret = dm_spi_xfer(dev, 16, NULL, buf, SPI_XFER_BEGIN | SPI_XFER_END);
dm_spi_release_bus(dev);
if (ret)
return ret;
raw = ((buf[0] << 8) + buf[1]) >> 3;
*temp = (((int)raw * 125) + 1000) / 2000;
return 0;
}
static struct dm_thermal_ops ti_lm74_ops = {
.get_temp = ti_lm74_get_temp,
};
static const struct udevice_id of_ti_lm74_match[] = {
{
.compatible = "ti,lm74",
},
{},
};
U_BOOT_DRIVER(ti_bandgap_thermal) = {
.name = "ti_lm74_thermal",
.id = UCLASS_THERMAL,
.ops = &ti_lm74_ops,
.of_match = of_ti_lm74_match,
};
|
