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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* HWMON support for Realtek PHY's
*
* Author: Heiner Kallweit <hkallweit1@gmail.com>
*/
#include <linux/hwmon.h>
#include <linux/phy.h>
#include "realtek.h"
#define RTL822X_VND2_TSALRM 0xa662
#define RTL822X_VND2_TSRR 0xbd84
#define RTL822X_VND2_TSSR 0xb54c
static int rtl822x_hwmon_get_temp(int raw)
{
if (raw >= 512)
raw -= 1024;
return 1000 * raw / 2;
}
static int rtl822x_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct phy_device *phydev = dev_get_drvdata(dev);
int raw;
switch (attr) {
case hwmon_temp_input:
raw = phy_read_mmd(phydev, MDIO_MMD_VEND2, RTL822X_VND2_TSRR) & 0x3ff;
*val = rtl822x_hwmon_get_temp(raw);
break;
case hwmon_temp_max:
/* Chip reduces speed to 1G if threshold is exceeded */
raw = phy_read_mmd(phydev, MDIO_MMD_VEND2, RTL822X_VND2_TSSR) >> 6;
*val = rtl822x_hwmon_get_temp(raw);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct hwmon_ops rtl822x_hwmon_ops = {
.visible = 0444,
.read = rtl822x_hwmon_read,
};
static const struct hwmon_channel_info * const rtl822x_hwmon_info[] = {
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX),
NULL
};
static const struct hwmon_chip_info rtl822x_hwmon_chip_info = {
.ops = &rtl822x_hwmon_ops,
.info = rtl822x_hwmon_info,
};
int rtl822x_hwmon_init(struct phy_device *phydev)
{
struct device *hwdev, *dev = &phydev->mdio.dev;
/* Ensure over-temp alarm is reset. */
phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2, RTL822X_VND2_TSALRM, 3);
hwdev = devm_hwmon_device_register_with_info(dev, NULL, phydev,
&rtl822x_hwmon_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwdev);
}
|
