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

   1 /*******************************************************************************
   2
   3   Intel(R) Gigabit Ethernet Linux driver
   4   Copyright(c) 2007-2014 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, see <http://www.gnu.org/licenses/>.
  17
  18   The full GNU General Public License is included in this distribution in
  19   the file called "COPYING".
  20
  21   Contact Information:
  22   e1000-devel Mailing List <[email protected]>
  23   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24
  25 *******************************************************************************/
  26
  27 #include "igb.h"
  28 #include "e1000_82575.h"
  29 #include "e1000_hw.h"
  30
  31 #include <linux/module.h>
  32 #include <linux/types.h>
  33 #include <linux/sysfs.h>
  34 #include <linux/kobject.h>
  35 #include <linux/device.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/hwmon.h>
  38 #include <linux/pci.h>
  39
  40 #ifdef CONFIG_IGB_HWMON
  41 static struct i2c_board_info i350_sensor_info = {
  42         I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
  43 };
  44
  45 /* hwmon callback functions */
  46 static ssize_t igb_hwmon_show_location(struct device *dev,
  47                                        struct device_attribute *attr,
  48                                        char *buf)
  49 {
  50         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  51                                                    dev_attr);
  52         return sprintf(buf, "loc%u\n",
  53                        igb_attr->sensor->location);
  54 }
  55
  56 static ssize_t igb_hwmon_show_temp(struct device *dev,
  57                                    struct device_attribute *attr,
  58                                    char *buf)
  59 {
  60         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  61                                                    dev_attr);
  62         unsigned int value;
  63
  64         /* reset the temp field */
  65         igb_attr->hw->mac.ops.get_thermal_sensor_data(igb_attr->hw);
  66
  67         value = igb_attr->sensor->temp;
  68
  69         /* display millidegree */
  70         value *= 1000;
  71
  72         return sprintf(buf, "%u\n", value);
  73 }
  74
  75 static ssize_t igb_hwmon_show_cautionthresh(struct device *dev,
  76                                             struct device_attribute *attr,
  77                                             char *buf)
  78 {
  79         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  80                                                    dev_attr);
  81         unsigned int value = igb_attr->sensor->caution_thresh;
  82
  83         /* display millidegree */
  84         value *= 1000;
  85
  86         return sprintf(buf, "%u\n", value);
  87 }
  88
  89 static ssize_t igb_hwmon_show_maxopthresh(struct device *dev,
  90                                           struct device_attribute *attr,
  91                                           char *buf)
  92 {
  93         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  94                                                    dev_attr);
  95         unsigned int value = igb_attr->sensor->max_op_thresh;
  96
  97         /* display millidegree */
  98         value *= 1000;
  99
 100         return sprintf(buf, "%u\n", value);
 101 }
 102
 103 /* igb_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
 104  * @ adapter: pointer to the adapter structure
 105  * @ offset: offset in the eeprom sensor data table
 106  * @ type: type of sensor data to display
 107  *
 108  * For each file we want in hwmon's sysfs interface we need a device_attribute
 109  * This is included in our hwmon_attr struct that contains the references to
 110  * the data structures we need to get the data to display.
 111  */
 112 static int igb_add_hwmon_attr(struct igb_adapter *adapter,
 113                               unsigned int offset, int type)
 114 {
 115         int rc;
 116         unsigned int n_attr;
 117         struct hwmon_attr *igb_attr;
 118
 119         n_attr = adapter->igb_hwmon_buff->n_hwmon;
 120         igb_attr = &adapter->igb_hwmon_buff->hwmon_list[n_attr];
 121
 122         switch (type) {
 123         case IGB_HWMON_TYPE_LOC:
 124                 igb_attr->dev_attr.show = igb_hwmon_show_location;
 125                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 126                          "temp%u_label", offset + 1);
 127                 break;
 128         case IGB_HWMON_TYPE_TEMP:
 129                 igb_attr->dev_attr.show = igb_hwmon_show_temp;
 130                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 131                          "temp%u_input", offset + 1);
 132                 break;
 133         case IGB_HWMON_TYPE_CAUTION:
 134                 igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
 135                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 136                          "temp%u_max", offset + 1);
 137                 break;
 138         case IGB_HWMON_TYPE_MAX:
 139                 igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
 140                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 141                          "temp%u_crit", offset + 1);
 142                 break;
 143         default:
 144                 rc = -EPERM;
 145                 return rc;
 146         }
 147
 148         /* These always the same regardless of type */
 149         igb_attr->sensor =
 150                 &adapter->hw.mac.thermal_sensor_data.sensor[offset];
 151         igb_attr->hw = &adapter->hw;
 152         igb_attr->dev_attr.store = NULL;
 153         igb_attr->dev_attr.attr.mode = S_IRUGO;
 154         igb_attr->dev_attr.attr.name = igb_attr->name;
 155         sysfs_attr_init(&igb_attr->dev_attr.attr);
 156
 157         adapter->igb_hwmon_buff->attrs[n_attr] = &igb_attr->dev_attr.attr;
 158
 159         ++adapter->igb_hwmon_buff->n_hwmon;
 160
 161         return 0;
 162 }
 163
 164 static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
 165 {
 166 }
 167
 168 /* called from igb_main.c */
 169 void igb_sysfs_exit(struct igb_adapter *adapter)
 170 {
 171         igb_sysfs_del_adapter(adapter);
 172 }
 173
 174 /* called from igb_main.c */
 175 int igb_sysfs_init(struct igb_adapter *adapter)
 176 {
 177         struct hwmon_buff *igb_hwmon;
 178         struct i2c_client *client;
 179         struct device *hwmon_dev;
 180         unsigned int i;
 181         int rc = 0;
 182
 183         /* If this method isn't defined we don't support thermals */
 184         if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL)
 185                 goto exit;
 186
 187         /* Don't create thermal hwmon interface if no sensors present */
 188         rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
 189         if (rc)
 190                 goto exit;
 191
 192         igb_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*igb_hwmon),
 193                                  GFP_KERNEL);
 194         if (!igb_hwmon) {
 195                 rc = -ENOMEM;
 196                 goto exit;
 197         }
 198         adapter->igb_hwmon_buff = igb_hwmon;
 199
 200         for (i = 0; i < E1000_MAX_SENSORS; i++) {
 201
 202                 /* Only create hwmon sysfs entries for sensors that have
 203                  * meaningful data.
 204                  */
 205                 if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
 206                         continue;
 207
 208                 /* Bail if any hwmon attr struct fails to initialize */
 209                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
 210                 if (rc)
 211                         goto exit;
 212                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
 213                 if (rc)
 214                         goto exit;
 215                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
 216                 if (rc)
 217                         goto exit;
 218                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
 219                 if (rc)
 220                         goto exit;
 221         }
 222
 223         /* init i2c_client */
 224         client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
 225         if (client == NULL) {
 226                 dev_info(&adapter->pdev->dev,
 227                          "Failed to create new i2c device.\n");
 228                 rc = -ENODEV;
 229                 goto exit;
 230         }
 231         adapter->i2c_client = client;
 232
 233         igb_hwmon->groups[0] = &igb_hwmon->group;
 234         igb_hwmon->group.attrs = igb_hwmon->attrs;
 235
 236         hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
 237                                                            client->name,
 238                                                            igb_hwmon,
 239                                                            igb_hwmon->groups);
 240         if (IS_ERR(hwmon_dev)) {
 241                 rc = PTR_ERR(hwmon_dev);
 242                 goto err;
 243         }
 244
 245         goto exit;
 246
 247 err:
 248         igb_sysfs_del_adapter(adapter);
 249 exit:
 250         return rc;
 251 }
 252 #endif