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
fbnic_hwmon_sensor_id(enum hwmon_sensor_types type)9 static 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
fbnic_hwmon_is_visible(const void * drvdata,enum hwmon_sensor_types type,u32 attr,int channel)19 static 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
fbnic_hwmon_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)31 static 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
42 static const struct hwmon_ops fbnic_hwmon_ops = {
43 .is_visible = fbnic_hwmon_is_visible,
44 .read = fbnic_hwmon_read,
45 };
46
47 static 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
53 static const struct hwmon_chip_info fbnic_chip_info = {
54 .ops = &fbnic_hwmon_ops,
55 .info = fbnic_hwmon_info,
56 };
57
fbnic_hwmon_register(struct fbnic_dev * fbd)58 void 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
fbnic_hwmon_unregister(struct fbnic_dev * fbd)74 void 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 }
82