1 /*******************************************************************************
2 
3   Intel 10 Gigabit PCI Express Linux driver
4   Copyright(c) 1999 - 2013 Intel Corporation.
5 
6   This program is free software; you can redistribute it and/or modify it
7   under the terms and conditions of the GNU General Public License,
8   version 2, as published by the Free Software Foundation.
9 
10   This program is distributed in the hope it will be useful, but WITHOUT
11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13   more details.
14 
15   You should have received a copy of the GNU General Public License along with
16   this program; if not, write to the Free Software Foundation, Inc.,
17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 
19   The full GNU General Public License is included in this distribution in
20   the file called "COPYING".
21 
22   Contact Information:
23   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
24   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 
26 *******************************************************************************/
27 
28 #include "ixgbe.h"
29 #include "ixgbe_common.h"
30 #include "ixgbe_type.h"
31 
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/sysfs.h>
35 #include <linux/kobject.h>
36 #include <linux/device.h>
37 #include <linux/netdevice.h>
38 #include <linux/hwmon.h>
39 
40 /* hwmon callback functions */
41 static ssize_t ixgbe_hwmon_show_location(struct device *dev,
42 					 struct device_attribute *attr,
43 					 char *buf)
44 {
45 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
46 						     dev_attr);
47 	return sprintf(buf, "loc%u\n",
48 		       ixgbe_attr->sensor->location);
49 }
50 
51 static ssize_t ixgbe_hwmon_show_temp(struct device *dev,
52 				     struct device_attribute *attr,
53 				     char *buf)
54 {
55 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
56 						     dev_attr);
57 	unsigned int value;
58 
59 	/* reset the temp field */
60 	ixgbe_attr->hw->mac.ops.get_thermal_sensor_data(ixgbe_attr->hw);
61 
62 	value = ixgbe_attr->sensor->temp;
63 
64 	/* display millidegree */
65 	value *= 1000;
66 
67 	return sprintf(buf, "%u\n", value);
68 }
69 
70 static ssize_t ixgbe_hwmon_show_cautionthresh(struct device *dev,
71 				     struct device_attribute *attr,
72 				     char *buf)
73 {
74 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
75 						     dev_attr);
76 	unsigned int value = ixgbe_attr->sensor->caution_thresh;
77 
78 	/* display millidegree */
79 	value *= 1000;
80 
81 	return sprintf(buf, "%u\n", value);
82 }
83 
84 static ssize_t ixgbe_hwmon_show_maxopthresh(struct device *dev,
85 				     struct device_attribute *attr,
86 				     char *buf)
87 {
88 	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
89 						     dev_attr);
90 	unsigned int value = ixgbe_attr->sensor->max_op_thresh;
91 
92 	/* display millidegree */
93 	value *= 1000;
94 
95 	return sprintf(buf, "%u\n", value);
96 }
97 
98 /**
99  * ixgbe_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
100  * @adapter: pointer to the adapter structure
101  * @offset: offset in the eeprom sensor data table
102  * @type: type of sensor data to display
103  *
104  * For each file we want in hwmon's sysfs interface we need a device_attribute
105  * This is included in our hwmon_attr struct that contains the references to
106  * the data structures we need to get the data to display.
107  */
108 static int ixgbe_add_hwmon_attr(struct ixgbe_adapter *adapter,
109 				unsigned int offset, int type) {
110 	int rc;
111 	unsigned int n_attr;
112 	struct hwmon_attr *ixgbe_attr;
113 
114 	n_attr = adapter->ixgbe_hwmon_buff.n_hwmon;
115 	ixgbe_attr = &adapter->ixgbe_hwmon_buff.hwmon_list[n_attr];
116 
117 	switch (type) {
118 	case IXGBE_HWMON_TYPE_LOC:
119 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_location;
120 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
121 			 "temp%u_label", offset);
122 		break;
123 	case IXGBE_HWMON_TYPE_TEMP:
124 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_temp;
125 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
126 			 "temp%u_input", offset);
127 		break;
128 	case IXGBE_HWMON_TYPE_CAUTION:
129 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_cautionthresh;
130 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
131 			 "temp%u_max", offset);
132 		break;
133 	case IXGBE_HWMON_TYPE_MAX:
134 		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_maxopthresh;
135 		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
136 			 "temp%u_crit", offset);
137 		break;
138 	default:
139 		rc = -EPERM;
140 		return rc;
141 	}
142 
143 	/* These always the same regardless of type */
144 	ixgbe_attr->sensor =
145 		&adapter->hw.mac.thermal_sensor_data.sensor[offset];
146 	ixgbe_attr->hw = &adapter->hw;
147 	ixgbe_attr->dev_attr.store = NULL;
148 	ixgbe_attr->dev_attr.attr.mode = S_IRUGO;
149 	ixgbe_attr->dev_attr.attr.name = ixgbe_attr->name;
150 
151 	rc = device_create_file(&adapter->pdev->dev,
152 				&ixgbe_attr->dev_attr);
153 
154 	if (rc == 0)
155 		++adapter->ixgbe_hwmon_buff.n_hwmon;
156 
157 	return rc;
158 }
159 
160 static void ixgbe_sysfs_del_adapter(struct ixgbe_adapter *adapter)
161 {
162 	int i;
163 
164 	if (adapter == NULL)
165 		return;
166 
167 	for (i = 0; i < adapter->ixgbe_hwmon_buff.n_hwmon; i++) {
168 		device_remove_file(&adapter->pdev->dev,
169 			   &adapter->ixgbe_hwmon_buff.hwmon_list[i].dev_attr);
170 	}
171 
172 	kfree(adapter->ixgbe_hwmon_buff.hwmon_list);
173 
174 	if (adapter->ixgbe_hwmon_buff.device)
175 		hwmon_device_unregister(adapter->ixgbe_hwmon_buff.device);
176 }
177 
178 /* called from ixgbe_main.c */
179 void ixgbe_sysfs_exit(struct ixgbe_adapter *adapter)
180 {
181 	ixgbe_sysfs_del_adapter(adapter);
182 }
183 
184 /* called from ixgbe_main.c */
185 int ixgbe_sysfs_init(struct ixgbe_adapter *adapter)
186 {
187 	struct hwmon_buff *ixgbe_hwmon = &adapter->ixgbe_hwmon_buff;
188 	unsigned int i;
189 	int n_attrs;
190 	int rc = 0;
191 
192 	/* If this method isn't defined we don't support thermals */
193 	if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL) {
194 		goto exit;
195 	}
196 
197 	/* Don't create thermal hwmon interface if no sensors present */
198 	if (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw))
199 		goto exit;
200 
201 	/*
202 	 * Allocation space for max attributs
203 	 * max num sensors * values (loc, temp, max, caution)
204 	 */
205 	n_attrs = IXGBE_MAX_SENSORS * 4;
206 	ixgbe_hwmon->hwmon_list = kcalloc(n_attrs, sizeof(struct hwmon_attr),
207 					  GFP_KERNEL);
208 	if (!ixgbe_hwmon->hwmon_list) {
209 		rc = -ENOMEM;
210 		goto err;
211 	}
212 
213 	ixgbe_hwmon->device = hwmon_device_register(&adapter->pdev->dev);
214 	if (IS_ERR(ixgbe_hwmon->device)) {
215 		rc = PTR_ERR(ixgbe_hwmon->device);
216 		goto err;
217 	}
218 
219 	for (i = 0; i < IXGBE_MAX_SENSORS; i++) {
220 		/*
221 		 * Only create hwmon sysfs entries for sensors that have
222 		 * meaningful data for.
223 		 */
224 		if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
225 			continue;
226 
227 		/* Bail if any hwmon attr struct fails to initialize */
228 		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_CAUTION);
229 		rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_LOC);
230 		rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_TEMP);
231 		rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_MAX);
232 		if (rc)
233 			goto err;
234 	}
235 
236 	goto exit;
237 
238 err:
239 	ixgbe_sysfs_del_adapter(adapter);
240 exit:
241 	return rc;
242 }
243 
244