drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c

   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