fbnic_hwmon.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) Meta Platforms, Inc. and affiliates. */
 3
 4#include <linux/hwmon.h>
 5
 6#include "fbnic.h"
 7#include "fbnic_mac.h"
 8
 9static int fbnic_hwmon_sensor_id(enum hwmon_sensor_types type)
10{
11	if (type == hwmon_temp)
12		return FBNIC_SENSOR_TEMP;
13	if (type == hwmon_in)
14		return FBNIC_SENSOR_VOLTAGE;
15
16	return -EOPNOTSUPP;
17}
18
19static umode_t fbnic_hwmon_is_visible(const void *drvdata,
20				      enum hwmon_sensor_types type,
21				      u32 attr, int channel)
22{
23	if (type == hwmon_temp && attr == hwmon_temp_input)
24		return 0444;
25	if (type == hwmon_in && attr == hwmon_in_input)
26		return 0444;
27
28	return 0;
29}
30
31static int fbnic_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
32			    u32 attr, int channel, long *val)
33{
34	struct fbnic_dev *fbd = dev_get_drvdata(dev);
35	const struct fbnic_mac *mac = fbd->mac;
36	int id;
37
38	id = fbnic_hwmon_sensor_id(type);
39	return id < 0 ? id : mac->get_sensor(fbd, id, val);
40}
41
42static const struct hwmon_ops fbnic_hwmon_ops = {
43	.is_visible = fbnic_hwmon_is_visible,
44	.read = fbnic_hwmon_read,
45};
46
47static const struct hwmon_channel_info *fbnic_hwmon_info[] = {
48	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
49	HWMON_CHANNEL_INFO(in, HWMON_I_INPUT),
50	NULL
51};
52
53static const struct hwmon_chip_info fbnic_chip_info = {
54	.ops = &fbnic_hwmon_ops,
55	.info = fbnic_hwmon_info,
56};
57
58void fbnic_hwmon_register(struct fbnic_dev *fbd)
59{
60	if (!IS_REACHABLE(CONFIG_HWMON))
61		return;
62
63	fbd->hwmon = hwmon_device_register_with_info(fbd->dev, "fbnic",
64						     fbd, &fbnic_chip_info,
65						     NULL);
66	if (IS_ERR(fbd->hwmon)) {
67		dev_notice(fbd->dev,
68			   "Failed to register hwmon device %pe\n",
69			   fbd->hwmon);
70		fbd->hwmon = NULL;
71	}
72}
73
74void fbnic_hwmon_unregister(struct fbnic_dev *fbd)
75{
76	if (!IS_REACHABLE(CONFIG_HWMON) || !fbd->hwmon)
77		return;
78
79	hwmon_device_unregister(fbd->hwmon);
80	fbd->hwmon = NULL;
81}