1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2007 - 2018 Intel Corporation. */
3 
4 #include "igb.h"
5 #include "e1000_82575.h"
6 #include "e1000_hw.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 #include <linux/pci.h>
16 
17 #ifdef CONFIG_IGB_HWMON
18 static struct i2c_board_info i350_sensor_info = {
19 	I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
20 };
21 
22 /* hwmon callback functions */
23 static ssize_t igb_hwmon_show_location(struct device *dev,
24 				       struct device_attribute *attr,
25 				       char *buf)
26 {
27 	struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
28 						   dev_attr);
29 	return sprintf(buf, "loc%u\n",
30 		       igb_attr->sensor->location);
31 }
32 
33 static ssize_t igb_hwmon_show_temp(struct device *dev,
34 				   struct device_attribute *attr,
35 				   char *buf)
36 {
37 	struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
38 						   dev_attr);
39 	unsigned int value;
40 
41 	/* reset the temp field */
42 	igb_attr->hw->mac.ops.get_thermal_sensor_data(igb_attr->hw);
43 
44 	value = igb_attr->sensor->temp;
45 
46 	/* display millidegree */
47 	value *= 1000;
48 
49 	return sprintf(buf, "%u\n", value);
50 }
51 
52 static ssize_t igb_hwmon_show_cautionthresh(struct device *dev,
53 					    struct device_attribute *attr,
54 					    char *buf)
55 {
56 	struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
57 						   dev_attr);
58 	unsigned int value = igb_attr->sensor->caution_thresh;
59 
60 	/* display millidegree */
61 	value *= 1000;
62 
63 	return sprintf(buf, "%u\n", value);
64 }
65 
66 static ssize_t igb_hwmon_show_maxopthresh(struct device *dev,
67 					  struct device_attribute *attr,
68 					  char *buf)
69 {
70 	struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
71 						   dev_attr);
72 	unsigned int value = igb_attr->sensor->max_op_thresh;
73 
74 	/* display millidegree */
75 	value *= 1000;
76 
77 	return sprintf(buf, "%u\n", value);
78 }
79 
80 /* igb_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
81  * @ adapter: pointer to the adapter structure
82  * @ offset: offset in the eeprom sensor data table
83  * @ type: type of sensor data to display
84  *
85  * For each file we want in hwmon's sysfs interface we need a device_attribute
86  * This is included in our hwmon_attr struct that contains the references to
87  * the data structures we need to get the data to display.
88  */
89 static int igb_add_hwmon_attr(struct igb_adapter *adapter,
90 			      unsigned int offset, int type)
91 {
92 	int rc;
93 	unsigned int n_attr;
94 	struct hwmon_attr *igb_attr;
95 
96 	n_attr = adapter->igb_hwmon_buff->n_hwmon;
97 	igb_attr = &adapter->igb_hwmon_buff->hwmon_list[n_attr];
98 
99 	switch (type) {
100 	case IGB_HWMON_TYPE_LOC:
101 		igb_attr->dev_attr.show = igb_hwmon_show_location;
102 		snprintf(igb_attr->name, sizeof(igb_attr->name),
103 			 "temp%u_label", offset + 1);
104 		break;
105 	case IGB_HWMON_TYPE_TEMP:
106 		igb_attr->dev_attr.show = igb_hwmon_show_temp;
107 		snprintf(igb_attr->name, sizeof(igb_attr->name),
108 			 "temp%u_input", offset + 1);
109 		break;
110 	case IGB_HWMON_TYPE_CAUTION:
111 		igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
112 		snprintf(igb_attr->name, sizeof(igb_attr->name),
113 			 "temp%u_max", offset + 1);
114 		break;
115 	case IGB_HWMON_TYPE_MAX:
116 		igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
117 		snprintf(igb_attr->name, sizeof(igb_attr->name),
118 			 "temp%u_crit", offset + 1);
119 		break;
120 	default:
121 		rc = -EPERM;
122 		return rc;
123 	}
124 
125 	/* These always the same regardless of type */
126 	igb_attr->sensor =
127 		&adapter->hw.mac.thermal_sensor_data.sensor[offset];
128 	igb_attr->hw = &adapter->hw;
129 	igb_attr->dev_attr.store = NULL;
130 	igb_attr->dev_attr.attr.mode = 0444;
131 	igb_attr->dev_attr.attr.name = igb_attr->name;
132 	sysfs_attr_init(&igb_attr->dev_attr.attr);
133 
134 	adapter->igb_hwmon_buff->attrs[n_attr] = &igb_attr->dev_attr.attr;
135 
136 	++adapter->igb_hwmon_buff->n_hwmon;
137 
138 	return 0;
139 }
140 
141 static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
142 {
143 }
144 
145 /* called from igb_main.c */
146 void igb_sysfs_exit(struct igb_adapter *adapter)
147 {
148 	igb_sysfs_del_adapter(adapter);
149 }
150 
151 /* called from igb_main.c */
152 int igb_sysfs_init(struct igb_adapter *adapter)
153 {
154 	struct hwmon_buff *igb_hwmon;
155 	struct i2c_client *client;
156 	struct device *hwmon_dev;
157 	unsigned int i;
158 	int rc = 0;
159 
160 	/* If this method isn't defined we don't support thermals */
161 	if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL)
162 		goto exit;
163 
164 	/* Don't create thermal hwmon interface if no sensors present */
165 	rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
166 	if (rc)
167 		goto exit;
168 
169 	igb_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*igb_hwmon),
170 				 GFP_KERNEL);
171 	if (!igb_hwmon) {
172 		rc = -ENOMEM;
173 		goto exit;
174 	}
175 	adapter->igb_hwmon_buff = igb_hwmon;
176 
177 	for (i = 0; i < E1000_MAX_SENSORS; i++) {
178 
179 		/* Only create hwmon sysfs entries for sensors that have
180 		 * meaningful data.
181 		 */
182 		if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
183 			continue;
184 
185 		/* Bail if any hwmon attr struct fails to initialize */
186 		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
187 		if (rc)
188 			goto exit;
189 		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
190 		if (rc)
191 			goto exit;
192 		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
193 		if (rc)
194 			goto exit;
195 		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
196 		if (rc)
197 			goto exit;
198 	}
199 
200 	/* init i2c_client */
201 	client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
202 	if (client == NULL) {
203 		dev_info(&adapter->pdev->dev,
204 			 "Failed to create new i2c device.\n");
205 		rc = -ENODEV;
206 		goto exit;
207 	}
208 	adapter->i2c_client = client;
209 
210 	igb_hwmon->groups[0] = &igb_hwmon->group;
211 	igb_hwmon->group.attrs = igb_hwmon->attrs;
212 
213 	hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
214 							   client->name,
215 							   igb_hwmon,
216 							   igb_hwmon->groups);
217 	if (IS_ERR(hwmon_dev)) {
218 		rc = PTR_ERR(hwmon_dev);
219 		goto err;
220 	}
221 
222 	goto exit;
223 
224 err:
225 	igb_sysfs_del_adapter(adapter);
226 exit:
227 	return rc;
228 }
229 #endif
230