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 static struct i2c_board_info i350_sensor_info = {
  43         I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
  44 };
  45
  46 /* hwmon callback functions */
  47 static ssize_t igb_hwmon_show_location(struct device *dev,
  48                                        struct device_attribute *attr,
  49                                        char *buf)
  50 {
  51         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  52                                                    dev_attr);
  53         return sprintf(buf, "loc%u\n",
  54                        igb_attr->sensor->location);
  55 }
  56
  57 static ssize_t igb_hwmon_show_temp(struct device *dev,
  58                                    struct device_attribute *attr,
  59                                    char *buf)
  60 {
  61         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  62                                                    dev_attr);
  63         unsigned int value;
  64
  65         /* reset the temp field */
  66         igb_attr->hw->mac.ops.get_thermal_sensor_data(igb_attr->hw);
  67
  68         value = igb_attr->sensor->temp;
  69
  70         /* display millidegree */
  71         value *= 1000;
  72
  73         return sprintf(buf, "%u\n", value);
  74 }
  75
  76 static ssize_t igb_hwmon_show_cautionthresh(struct device *dev,
  77                                             struct device_attribute *attr,
  78                                             char *buf)
  79 {
  80         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  81                                                    dev_attr);
  82         unsigned int value = igb_attr->sensor->caution_thresh;
  83
  84         /* display millidegree */
  85         value *= 1000;
  86
  87         return sprintf(buf, "%u\n", value);
  88 }
  89
  90 static ssize_t igb_hwmon_show_maxopthresh(struct device *dev,
  91                                           struct device_attribute *attr,
  92                                           char *buf)
  93 {
  94         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  95                                                    dev_attr);
  96         unsigned int value = igb_attr->sensor->max_op_thresh;
  97
  98         /* display millidegree */
  99         value *= 1000;
 100
 101         return sprintf(buf, "%u\n", value);
 102 }
 103
 104 /* igb_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
 105  * @ adapter: pointer to the adapter structure
 106  * @ offset: offset in the eeprom sensor data table
 107  * @ type: type of sensor data to display
 108  *
 109  * For each file we want in hwmon's sysfs interface we need a device_attribute
 110  * This is included in our hwmon_attr struct that contains the references to
 111  * the data structures we need to get the data to display.
 112  */
 113 static int igb_add_hwmon_attr(struct igb_adapter *adapter,
 114                               unsigned int offset, int type)
 115 {
 116         int rc;
 117         unsigned int n_attr;
 118         struct hwmon_attr *igb_attr;
 119
 120         n_attr = adapter->igb_hwmon_buff.n_hwmon;
 121         igb_attr = &adapter->igb_hwmon_buff.hwmon_list[n_attr];
 122
 123         switch (type) {
 124         case IGB_HWMON_TYPE_LOC:
 125                 igb_attr->dev_attr.show = igb_hwmon_show_location;
 126                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 127                          "temp%u_label", offset);
 128                 break;
 129         case IGB_HWMON_TYPE_TEMP:
 130                 igb_attr->dev_attr.show = igb_hwmon_show_temp;
 131                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 132                          "temp%u_input", offset);
 133                 break;
 134         case IGB_HWMON_TYPE_CAUTION:
 135                 igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
 136                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 137                          "temp%u_max", offset);
 138                 break;
 139         case IGB_HWMON_TYPE_MAX:
 140                 igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
 141                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 142                          "temp%u_crit", offset);
 143                 break;
 144         default:
 145                 rc = -EPERM;
 146                 return rc;
 147         }
 148
 149         /* These always the same regardless of type */
 150         igb_attr->sensor =
 151                 &adapter->hw.mac.thermal_sensor_data.sensor[offset];
 152         igb_attr->hw = &adapter->hw;
 153         igb_attr->dev_attr.store = NULL;
 154         igb_attr->dev_attr.attr.mode = S_IRUGO;
 155         igb_attr->dev_attr.attr.name = igb_attr->name;
 156         sysfs_attr_init(&igb_attr->dev_attr.attr);
 157         rc = device_create_file(&adapter->pdev->dev,
 158                                 &igb_attr->dev_attr);
 159         if (rc == 0)
 160                 ++adapter->igb_hwmon_buff.n_hwmon;
 161
 162         return rc;
 163 }
 164
 165 static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
 166 {
 167         int i;
 168
 169         if (adapter == NULL)
 170                 return;
 171
 172         for (i = 0; i < adapter->igb_hwmon_buff.n_hwmon; i++) {
 173                 device_remove_file(&adapter->pdev->dev,
 174                            &adapter->igb_hwmon_buff.hwmon_list[i].dev_attr);
 175         }
 176
 177         kfree(adapter->igb_hwmon_buff.hwmon_list);
 178
 179         if (adapter->igb_hwmon_buff.device)
 180                 hwmon_device_unregister(adapter->igb_hwmon_buff.device);
 181 }
 182
 183 /* called from igb_main.c */
 184 void igb_sysfs_exit(struct igb_adapter *adapter)
 185 {
 186         igb_sysfs_del_adapter(adapter);
 187 }
 188
 189 /* called from igb_main.c */
 190 int igb_sysfs_init(struct igb_adapter *adapter)
 191 {
 192         struct hwmon_buff *igb_hwmon = &adapter->igb_hwmon_buff;
 193         unsigned int i;
 194         int n_attrs;
 195         int rc = 0;
 196         struct i2c_client *client = NULL;
 197
 198         /* If this method isn't defined we don't support thermals */
 199         if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL)
 200                 goto exit;
 201
 202         /* Don't create thermal hwmon interface if no sensors present */
 203         rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
 204                 if (rc)
 205                         goto exit;
 206
 207         /* init i2c_client */
 208         client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
 209         if (client == NULL) {
 210                 dev_info(&adapter->pdev->dev,
 211                         "Failed to create new i2c device..\n");
 212                 goto exit;
 213         }
 214         adapter->i2c_client = client;
 215
 216         /* Allocation space for max attributes
 217          * max num sensors * values (loc, temp, max, caution)
 218          */
 219         n_attrs = E1000_MAX_SENSORS * 4;
 220         igb_hwmon->hwmon_list = kcalloc(n_attrs, sizeof(struct hwmon_attr),
 221                                         GFP_KERNEL);
 222         if (!igb_hwmon->hwmon_list) {
 223                 rc = -ENOMEM;
 224                 goto err;
 225         }
 226
 227         igb_hwmon->device = hwmon_device_register(&adapter->pdev->dev);
 228         if (IS_ERR(igb_hwmon->device)) {
 229                 rc = PTR_ERR(igb_hwmon->device);
 230                 goto err;
 231         }
 232
 233         for (i = 0; i < E1000_MAX_SENSORS; i++) {
 234
 235                 /* Only create hwmon sysfs entries for sensors that have
 236                  * meaningful data.
 237                  */
 238                 if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
 239                         continue;
 240
 241                 /* Bail if any hwmon attr struct fails to initialize */
 242                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
 243                 rc |= igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
 244                 rc |= igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
 245                 rc |= igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
 246                 if (rc)
 247                         goto err;
 248         }
 249
 250         goto exit;
 251
 252 err:
 253         igb_sysfs_del_adapter(adapter);
 254 exit:
 255         return rc;
 256 }
 257 #endif