1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 1999 - 2018 Intel Corporation. */
3 
4 #include "ixgbe.h"
5 #include "ixgbe_common.h"
6 #include "ixgbe_type.h"
7 
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/sysfs.h>
11 #include <linux/kobject.h>
12 #include <linux/device.h>
13 #include <linux/netdevice.h>
14 #include <linux/hwmon.h>
15 
16 /* hwmon callback functions */
17 static ssize_t ixgbe_hwmon_show_location(struct device *dev,
18 					 struct device_attribute *attr,
19 					 char *buf)
20 {
21 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
22 						     dev_attr);
23 	return sprintf(buf, "loc%u\n",
24 		       ixgbe_attr->sensor->location);
25 }
26 
27 static ssize_t ixgbe_hwmon_show_temp(struct device *dev,
28 				     struct device_attribute *attr,
29 				     char *buf)
30 {
31 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
32 						     dev_attr);
33 	unsigned int value;
34 
35 	/* reset the temp field */
36 	ixgbe_attr->hw->mac.ops.get_thermal_sensor_data(ixgbe_attr->hw);
37 
38 	value = ixgbe_attr->sensor->temp;
39 
40 	/* display millidegree */
41 	value *= 1000;
42 
43 	return sprintf(buf, "%u\n", value);
44 }
45 
46 static ssize_t ixgbe_hwmon_show_cautionthresh(struct device *dev,
47 				     struct device_attribute *attr,
48 				     char *buf)
49 {
50 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
51 						     dev_attr);
52 	unsigned int value = ixgbe_attr->sensor->caution_thresh;
53 
54 	/* display millidegree */
55 	value *= 1000;
56 
57 	return sprintf(buf, "%u\n", value);
58 }
59 
60 static ssize_t ixgbe_hwmon_show_maxopthresh(struct device *dev,
61 				     struct device_attribute *attr,
62 				     char *buf)
63 {
64 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
65 						     dev_attr);
66 	unsigned int value = ixgbe_attr->sensor->max_op_thresh;
67 
68 	/* display millidegree */
69 	value *= 1000;
70 
71 	return sprintf(buf, "%u\n", value);
72 }
73 
74 /**
75  * ixgbe_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
76  * @adapter: pointer to the adapter structure
77  * @offset: offset in the eeprom sensor data table
78  * @type: type of sensor data to display
79  *
80  * For each file we want in hwmon's sysfs interface we need a device_attribute
81  * This is included in our hwmon_attr struct that contains the references to
82  * the data structures we need to get the data to display.
83  */
84 static int ixgbe_add_hwmon_attr(struct ixgbe_adapter *adapter,
85 				unsigned int offset, int type) {
86 	int rc;
87 	unsigned int n_attr;
88 	struct hwmon_attr *ixgbe_attr;
89 
90 	n_attr = adapter->ixgbe_hwmon_buff->n_hwmon;
91 	ixgbe_attr = &adapter->ixgbe_hwmon_buff->hwmon_list[n_attr];
92 
93 	switch (type) {
94 	case IXGBE_HWMON_TYPE_LOC:
95 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_location;
96 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
97 			 "temp%u_label", offset + 1);
98 		break;
99 	case IXGBE_HWMON_TYPE_TEMP:
100 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_temp;
101 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
102 			 "temp%u_input", offset + 1);
103 		break;
104 	case IXGBE_HWMON_TYPE_CAUTION:
105 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_cautionthresh;
106 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
107 			 "temp%u_max", offset + 1);
108 		break;
109 	case IXGBE_HWMON_TYPE_MAX:
110 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_maxopthresh;
111 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
112 			 "temp%u_crit", offset + 1);
113 		break;
114 	default:
115 		rc = -EPERM;
116 		return rc;
117 	}
118 
119 	/* These always the same regardless of type */
120 	ixgbe_attr->sensor =
121 		&adapter->hw.mac.thermal_sensor_data.sensor[offset];
122 	ixgbe_attr->hw = &adapter->hw;
123 	ixgbe_attr->dev_attr.store = NULL;
124 	ixgbe_attr->dev_attr.attr.mode = 0444;
125 	ixgbe_attr->dev_attr.attr.name = ixgbe_attr->name;
126 	sysfs_attr_init(&ixgbe_attr->dev_attr.attr);
127 
128 	adapter->ixgbe_hwmon_buff->attrs[n_attr] = &ixgbe_attr->dev_attr.attr;
129 
130 	++adapter->ixgbe_hwmon_buff->n_hwmon;
131 
132 	return 0;
133 }
134 
135 static void ixgbe_sysfs_del_adapter(struct ixgbe_adapter *adapter)
136 {
137 }
138 
139 /* called from ixgbe_main.c */
140 void ixgbe_sysfs_exit(struct ixgbe_adapter *adapter)
141 {
142 	ixgbe_sysfs_del_adapter(adapter);
143 }
144 
145 /* called from ixgbe_main.c */
146 int ixgbe_sysfs_init(struct ixgbe_adapter *adapter)
147 {
148 	struct hwmon_buff *ixgbe_hwmon;
149 	struct device *hwmon_dev;
150 	unsigned int i;
151 	int rc = 0;
152 
153 	/* If this method isn't defined we don't support thermals */
154 	if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL) {
155 		goto exit;
156 	}
157 
158 	/* Don't create thermal hwmon interface if no sensors present */
159 	if (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw))
160 		goto exit;
161 
162 	ixgbe_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*ixgbe_hwmon),
163 				   GFP_KERNEL);
164 	if (ixgbe_hwmon == NULL) {
165 		rc = -ENOMEM;
166 		goto exit;
167 	}
168 	adapter->ixgbe_hwmon_buff = ixgbe_hwmon;
169 
170 	for (i = 0; i < IXGBE_MAX_SENSORS; i++) {
171 		/*
172 		 * Only create hwmon sysfs entries for sensors that have
173 		 * meaningful data for.
174 		 */
175 		if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
176 			continue;
177 
178 		/* Bail if any hwmon attr struct fails to initialize */
179 		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_CAUTION);
180 		if (rc)
181 			goto exit;
182 		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_LOC);
183 		if (rc)
184 			goto exit;
185 		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_TEMP);
186 		if (rc)
187 			goto exit;
188 		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_MAX);
189 		if (rc)
190 			goto exit;
191 	}
192 
193 	ixgbe_hwmon->groups[0] = &ixgbe_hwmon->group;
194 	ixgbe_hwmon->group.attrs = ixgbe_hwmon->attrs;
195 
196 	hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
197 							   "ixgbe",
198 							   ixgbe_hwmon,
199 							   ixgbe_hwmon->groups);
200 	if (IS_ERR(hwmon_dev))
201 		rc = PTR_ERR(hwmon_dev);
202 exit:
203 	return rc;
204 }
205 
206