1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Atlantic Network Driver
3  *
4  * Copyright (C) 2014-2019 aQuantia Corporation
5  * Copyright (C) 2019-2020 Marvell International Ltd.
6  */
7 
8 /* File aq_drvinfo.c: Definition of common code for firmware info in sys.*/
9 
10 #include <linux/init.h>
11 #include <linux/kobject.h>
12 #include <linux/module.h>
13 #include <linux/stat.h>
14 #include <linux/string.h>
15 #include <linux/hwmon.h>
16 #include <linux/uaccess.h>
17 
18 #include "aq_drvinfo.h"
19 #include "aq_nic.h"
20 
21 #if IS_REACHABLE(CONFIG_HWMON)
22 static const char * const atl_temp_label[] = {
23 	"PHY Temperature",
24 	"MAC Temperature",
25 };
26 
27 static int aq_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
28 			 u32 attr, int channel, long *value)
29 {
30 	struct aq_nic_s *aq_nic = dev_get_drvdata(dev);
31 	int err = 0;
32 	int temp;
33 
34 	if (!aq_nic)
35 		return -EIO;
36 
37 	if (type != hwmon_temp || attr != hwmon_temp_input)
38 		return -EOPNOTSUPP;
39 
40 	switch (channel) {
41 	case 0:
42 		if (!aq_nic->aq_fw_ops->get_phy_temp)
43 			return -EOPNOTSUPP;
44 
45 		err = aq_nic->aq_fw_ops->get_phy_temp(aq_nic->aq_hw, &temp);
46 		*value = temp;
47 		break;
48 	case 1:
49 		if (!aq_nic->aq_fw_ops->get_mac_temp &&
50 		    !aq_nic->aq_hw_ops->hw_get_mac_temp)
51 			return -EOPNOTSUPP;
52 
53 		if (aq_nic->aq_fw_ops->get_mac_temp)
54 			err = aq_nic->aq_fw_ops->get_mac_temp(aq_nic->aq_hw, &temp);
55 		else
56 			err = aq_nic->aq_hw_ops->hw_get_mac_temp(aq_nic->aq_hw, &temp);
57 		*value = temp;
58 		break;
59 	default:
60 		return -EOPNOTSUPP;
61 	}
62 
63 	return err;
64 }
65 
66 static int aq_hwmon_read_string(struct device *dev,
67 				enum hwmon_sensor_types type,
68 				u32 attr, int channel, const char **str)
69 {
70 	struct aq_nic_s *aq_nic = dev_get_drvdata(dev);
71 
72 	if (!aq_nic)
73 		return -EIO;
74 
75 	if (type != hwmon_temp || attr != hwmon_temp_label)
76 		return -EOPNOTSUPP;
77 
78 	if (channel < ARRAY_SIZE(atl_temp_label))
79 		*str = atl_temp_label[channel];
80 	else
81 		return -EOPNOTSUPP;
82 
83 	return 0;
84 }
85 
86 static umode_t aq_hwmon_is_visible(const void *data,
87 				   enum hwmon_sensor_types type,
88 				   u32 attr, int channel)
89 {
90 	const struct aq_nic_s *nic = data;
91 
92 	if (type != hwmon_temp)
93 		return 0;
94 
95 	if (channel == 0 && !nic->aq_fw_ops->get_phy_temp)
96 		return 0;
97 	else if (channel == 1 && !nic->aq_fw_ops->get_mac_temp &&
98 		 !nic->aq_hw_ops->hw_get_mac_temp)
99 		return 0;
100 
101 	switch (attr) {
102 	case hwmon_temp_input:
103 	case hwmon_temp_label:
104 		return 0444;
105 	default:
106 		return 0;
107 	}
108 }
109 
110 static const struct hwmon_ops aq_hwmon_ops = {
111 	.is_visible = aq_hwmon_is_visible,
112 	.read = aq_hwmon_read,
113 	.read_string = aq_hwmon_read_string,
114 };
115 
116 static u32 aq_hwmon_temp_config[] = {
117 	HWMON_T_INPUT | HWMON_T_LABEL,
118 	HWMON_T_INPUT | HWMON_T_LABEL,
119 	0,
120 };
121 
122 static const struct hwmon_channel_info aq_hwmon_temp = {
123 	.type = hwmon_temp,
124 	.config = aq_hwmon_temp_config,
125 };
126 
127 static const struct hwmon_channel_info * const aq_hwmon_info[] = {
128 	&aq_hwmon_temp,
129 	NULL,
130 };
131 
132 static const struct hwmon_chip_info aq_hwmon_chip_info = {
133 	.ops = &aq_hwmon_ops,
134 	.info = aq_hwmon_info,
135 };
136 
137 int aq_drvinfo_init(struct net_device *ndev)
138 {
139 	struct aq_nic_s *aq_nic = netdev_priv(ndev);
140 	struct device *dev = &aq_nic->pdev->dev;
141 	struct device *hwmon_dev;
142 	int err = 0;
143 
144 	hwmon_dev = devm_hwmon_device_register_with_info(dev,
145 							 ndev->name,
146 							 aq_nic,
147 							 &aq_hwmon_chip_info,
148 							 NULL);
149 
150 	if (IS_ERR(hwmon_dev))
151 		err = PTR_ERR(hwmon_dev);
152 
153 	return err;
154 }
155 
156 #else
157 int aq_drvinfo_init(struct net_device *ndev) { return 0; }
158 #endif
159