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

   1 /* Intel(R) Gigabit Ethernet Linux driver
   2  * Copyright(c) 2007-2014 Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, see <http://www.gnu.org/licenses/>.
  15  *
  16  * The full GNU General Public License is included in this distribution in
  17  * the file called "COPYING".
  18  *
  19  * Contact Information:
  20  * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  21  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  22  */
  23
  24 #include "igb.h"
  25 #include "e1000_82575.h"
  26 #include "e1000_hw.h"
  27
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/sysfs.h>
  31 #include <linux/kobject.h>
  32 #include <linux/device.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/hwmon.h>
  35 #include <linux/pci.h>
  36
  37 #ifdef CONFIG_IGB_HWMON
  38 static struct i2c_board_info i350_sensor_info = {
  39         I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
  40 };
  41
  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 {
 112         int rc;
 113         unsigned int n_attr;
 114         struct hwmon_attr *igb_attr;
 115
 116         n_attr = adapter->igb_hwmon_buff->n_hwmon;
 117         igb_attr = &adapter->igb_hwmon_buff->hwmon_list[n_attr];
 118
 119         switch (type) {
 120         case IGB_HWMON_TYPE_LOC:
 121                 igb_attr->dev_attr.show = igb_hwmon_show_location;
 122                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 123                          "temp%u_label", offset + 1);
 124                 break;
 125         case IGB_HWMON_TYPE_TEMP:
 126                 igb_attr->dev_attr.show = igb_hwmon_show_temp;
 127                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 128                          "temp%u_input", offset + 1);
 129                 break;
 130         case IGB_HWMON_TYPE_CAUTION:
 131                 igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
 132                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 133                          "temp%u_max", offset + 1);
 134                 break;
 135         case IGB_HWMON_TYPE_MAX:
 136                 igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
 137                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 138                          "temp%u_crit", offset + 1);
 139                 break;
 140         default:
 141                 rc = -EPERM;
 142                 return rc;
 143         }
 144
 145         /* These always the same regardless of type */
 146         igb_attr->sensor =
 147                 &adapter->hw.mac.thermal_sensor_data.sensor[offset];
 148         igb_attr->hw = &adapter->hw;
 149         igb_attr->dev_attr.store = NULL;
 150         igb_attr->dev_attr.attr.mode = S_IRUGO;
 151         igb_attr->dev_attr.attr.name = igb_attr->name;
 152         sysfs_attr_init(&igb_attr->dev_attr.attr);
 153
 154         adapter->igb_hwmon_buff->attrs[n_attr] = &igb_attr->dev_attr.attr;
 155
 156         ++adapter->igb_hwmon_buff->n_hwmon;
 157
 158         return 0;
 159 }
 160
 161 static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
 162 {
 163 }
 164
 165 /* called from igb_main.c */
 166 void igb_sysfs_exit(struct igb_adapter *adapter)
 167 {
 168         igb_sysfs_del_adapter(adapter);
 169 }
 170
 171 /* called from igb_main.c */
 172 int igb_sysfs_init(struct igb_adapter *adapter)
 173 {
 174         struct hwmon_buff *igb_hwmon;
 175         struct i2c_client *client;
 176         struct device *hwmon_dev;
 177         unsigned int i;
 178         int rc = 0;
 179
 180         /* If this method isn't defined we don't support thermals */
 181         if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL)
 182                 goto exit;
 183
 184         /* Don't create thermal hwmon interface if no sensors present */
 185         rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
 186         if (rc)
 187                 goto exit;
 188
 189         igb_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*igb_hwmon),
 190                                  GFP_KERNEL);
 191         if (!igb_hwmon) {
 192                 rc = -ENOMEM;
 193                 goto exit;
 194         }
 195         adapter->igb_hwmon_buff = igb_hwmon;
 196
 197         for (i = 0; i < E1000_MAX_SENSORS; i++) {
 198
 199                 /* Only create hwmon sysfs entries for sensors that have
 200                  * meaningful data.
 201                  */
 202                 if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
 203                         continue;
 204
 205                 /* Bail if any hwmon attr struct fails to initialize */
 206                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
 207                 if (rc)
 208                         goto exit;
 209                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
 210                 if (rc)
 211                         goto exit;
 212                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
 213                 if (rc)
 214                         goto exit;
 215                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
 216                 if (rc)
 217                         goto exit;
 218         }
 219
 220         /* init i2c_client */
 221         client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
 222         if (client == NULL) {
 223                 dev_info(&adapter->pdev->dev,
 224                          "Failed to create new i2c device.\n");
 225                 rc = -ENODEV;
 226                 goto exit;
 227         }
 228         adapter->i2c_client = client;
 229
 230         igb_hwmon->groups[0] = &igb_hwmon->group;
 231         igb_hwmon->group.attrs = igb_hwmon->attrs;
 232
 233         hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
 234                                                            client->name,
 235                                                            igb_hwmon,
 236                                                            igb_hwmon->groups);
 237         if (IS_ERR(hwmon_dev)) {
 238                 rc = PTR_ERR(hwmon_dev);
 239                 goto err;
 240         }
 241
 242         goto exit;
 243
 244 err:
 245         igb_sysfs_del_adapter(adapter);
 246 exit:
 247         return rc;
 248 }
 249 #endif