drivers/net/ethernet/intel/igb/igb_hwmon.c

   1 /*******************************************************************************
   2
   3   Intel(R) Gigabit Ethernet Linux driver
   4   Copyright(c) 2007-2013 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 "igb.h"
  29 #include "e1000_82575.h"
  30 #include "e1000_hw.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 #include <linux/pci.h>
  40
  41 #ifdef CONFIG_IGB_HWMON
  42 /* hwmon callback functions */
  43 static ssize_t igb_hwmon_show_location(struct device *dev,
  44                                          struct device_attribute *attr,
  45                                          char *buf)
  46 {
  47         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  48                                                      dev_attr);
  49         return sprintf(buf, "loc%u\n",
  50                        igb_attr->sensor->location);
  51 }
  52
  53 static ssize_t igb_hwmon_show_temp(struct device *dev,
  54                                      struct device_attribute *attr,
  55                                      char *buf)
  56 {
  57         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  58                                                      dev_attr);
  59         unsigned int value;
  60
  61         /* reset the temp field */
  62         igb_attr->hw->mac.ops.get_thermal_sensor_data(igb_attr->hw);
  63
  64         value = igb_attr->sensor->temp;
  65
  66         /* display millidegree */
  67         value *= 1000;
  68
  69         return sprintf(buf, "%u\n", value);
  70 }
  71
  72 static ssize_t igb_hwmon_show_cautionthresh(struct device *dev,
  73                                      struct device_attribute *attr,
  74                                      char *buf)
  75 {
  76         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  77                                                      dev_attr);
  78         unsigned int value = igb_attr->sensor->caution_thresh;
  79
  80         /* display millidegree */
  81         value *= 1000;
  82
  83         return sprintf(buf, "%u\n", value);
  84 }
  85
  86 static ssize_t igb_hwmon_show_maxopthresh(struct device *dev,
  87                                      struct device_attribute *attr,
  88                                      char *buf)
  89 {
  90         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  91                                                      dev_attr);
  92         unsigned int value = igb_attr->sensor->max_op_thresh;
  93
  94         /* display millidegree */
  95         value *= 1000;
  96
  97         return sprintf(buf, "%u\n", value);
  98 }
  99
 100 /* igb_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
 101  * @ adapter: pointer to the adapter structure
 102  * @ offset: offset in the eeprom sensor data table
 103  * @ type: type of sensor data to display
 104  *
 105  * For each file we want in hwmon's sysfs interface we need a device_attribute
 106  * This is included in our hwmon_attr struct that contains the references to
 107  * the data structures we need to get the data to display.
 108  */
 109 static int igb_add_hwmon_attr(struct igb_adapter *adapter,
 110                                 unsigned int offset, int type) {
 111         int rc;
 112         unsigned int n_attr;
 113         struct hwmon_attr *igb_attr;
 114
 115         n_attr = adapter->igb_hwmon_buff.n_hwmon;
 116         igb_attr = &adapter->igb_hwmon_buff.hwmon_list[n_attr];
 117
 118         switch (type) {
 119         case IGB_HWMON_TYPE_LOC:
 120                 igb_attr->dev_attr.show = igb_hwmon_show_location;
 121                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 122                          "temp%u_label", offset);
 123                 break;
 124         case IGB_HWMON_TYPE_TEMP:
 125                 igb_attr->dev_attr.show = igb_hwmon_show_temp;
 126                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 127                          "temp%u_input", offset);
 128                 break;
 129         case IGB_HWMON_TYPE_CAUTION:
 130                 igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
 131                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 132                          "temp%u_max", offset);
 133                 break;
 134         case IGB_HWMON_TYPE_MAX:
 135                 igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
 136                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 137                          "temp%u_crit", offset);
 138                 break;
 139         default:
 140                 rc = -EPERM;
 141                 return rc;
 142         }
 143
 144         /* These always the same regardless of type */
 145         igb_attr->sensor =
 146                 &adapter->hw.mac.thermal_sensor_data.sensor[offset];
 147         igb_attr->hw = &adapter->hw;
 148         igb_attr->dev_attr.store = NULL;
 149         igb_attr->dev_attr.attr.mode = S_IRUGO;
 150         igb_attr->dev_attr.attr.name = igb_attr->name;
 151         sysfs_attr_init(&igb_attr->dev_attr.attr);
 152         rc = device_create_file(&adapter->pdev->dev,
 153                                 &igb_attr->dev_attr);
 154         if (rc == 0)
 155                 ++adapter->igb_hwmon_buff.n_hwmon;
 156
 157         return rc;
 158 }
 159
 160 static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
 161 {
 162         int i;
 163
 164         if (adapter == NULL)
 165                 return;
 166
 167         for (i = 0; i < adapter->igb_hwmon_buff.n_hwmon; i++) {
 168                 device_remove_file(&adapter->pdev->dev,
 169                            &adapter->igb_hwmon_buff.hwmon_list[i].dev_attr);
 170         }
 171
 172         kfree(adapter->igb_hwmon_buff.hwmon_list);
 173
 174         if (adapter->igb_hwmon_buff.device)
 175                 hwmon_device_unregister(adapter->igb_hwmon_buff.device);
 176 }
 177
 178 /* called from igb_main.c */
 179 void igb_sysfs_exit(struct igb_adapter *adapter)
 180 {
 181         igb_sysfs_del_adapter(adapter);
 182 }
 183
 184 /* called from igb_main.c */
 185 int igb_sysfs_init(struct igb_adapter *adapter)
 186 {
 187         struct hwmon_buff *igb_hwmon = &adapter->igb_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         /* Don't create thermal hwmon interface if no sensors present */
 197         rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
 198                 if (rc)
 199                         goto exit;
 200
 201         /* Allocation space for max attributes
 202          * max num sensors * values (loc, temp, max, caution)
 203          */
 204         n_attrs = E1000_MAX_SENSORS * 4;
 205         igb_hwmon->hwmon_list = kcalloc(n_attrs, sizeof(struct hwmon_attr),
 206                                           GFP_KERNEL);
 207         if (!igb_hwmon->hwmon_list) {
 208                 rc = -ENOMEM;
 209                 goto err;
 210         }
 211
 212         igb_hwmon->device = hwmon_device_register(&adapter->pdev->dev);
 213         if (IS_ERR(igb_hwmon->device)) {
 214                 rc = PTR_ERR(igb_hwmon->device);
 215                 goto err;
 216         }
 217
 218         for (i = 0; i < E1000_MAX_SENSORS; i++) {
 219
 220                 /* Only create hwmon sysfs entries for sensors that have
 221                  * meaningful data.
 222                  */
 223                 if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
 224                         continue;
 225
 226                 /* Bail if any hwmon attr struct fails to initialize */
 227                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
 228                 rc |= igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
 229                 rc |= igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
 230                 rc |= igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
 231                 if (rc)
 232                         goto err;
 233         }
 234
 235         goto exit;
 236
 237 err:
 238         igb_sysfs_del_adapter(adapter);
 239 exit:
 240         return rc;
 241 }
 242 #endif