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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2007 - 2018 Intel Corporation. */
   3
   4 #include "igb.h"
   5 #include "e1000_82575.h"
   6 #include "e1000_hw.h"
   7
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/sysfs.h>
  11 #include <linux/kobject.h>
  12 #include <linux/device.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/pci.h>
  16
  17 #ifdef CONFIG_IGB_HWMON
  18 static struct i2c_board_info i350_sensor_info = {
  19         I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
  20 };
  21
  22 /* hwmon callback functions */
  23 static ssize_t igb_hwmon_show_location(struct device *dev,
  24                                        struct device_attribute *attr,
  25                                        char *buf)
  26 {
  27         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  28                                                    dev_attr);
  29         return sprintf(buf, "loc%u\n",
  30                        igb_attr->sensor->location);
  31 }
  32
  33 static ssize_t igb_hwmon_show_temp(struct device *dev,
  34                                    struct device_attribute *attr,
  35                                    char *buf)
  36 {
  37         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  38                                                    dev_attr);
  39         unsigned int value;
  40
  41         /* reset the temp field */
  42         igb_attr->hw->mac.ops.get_thermal_sensor_data(igb_attr->hw);
  43
  44         value = igb_attr->sensor->temp;
  45
  46         /* display millidegree */
  47         value *= 1000;
  48
  49         return sprintf(buf, "%u\n", value);
  50 }
  51
  52 static ssize_t igb_hwmon_show_cautionthresh(struct device *dev,
  53                                             struct device_attribute *attr,
  54                                             char *buf)
  55 {
  56         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  57                                                    dev_attr);
  58         unsigned int value = igb_attr->sensor->caution_thresh;
  59
  60         /* display millidegree */
  61         value *= 1000;
  62
  63         return sprintf(buf, "%u\n", value);
  64 }
  65
  66 static ssize_t igb_hwmon_show_maxopthresh(struct device *dev,
  67                                           struct device_attribute *attr,
  68                                           char *buf)
  69 {
  70         struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
  71                                                    dev_attr);
  72         unsigned int value = igb_attr->sensor->max_op_thresh;
  73
  74         /* display millidegree */
  75         value *= 1000;
  76
  77         return sprintf(buf, "%u\n", value);
  78 }
  79
  80 /* igb_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
  81  * @ adapter: pointer to the adapter structure
  82  * @ offset: offset in the eeprom sensor data table
  83  * @ type: type of sensor data to display
  84  *
  85  * For each file we want in hwmon's sysfs interface we need a device_attribute
  86  * This is included in our hwmon_attr struct that contains the references to
  87  * the data structures we need to get the data to display.
  88  */
  89 static int igb_add_hwmon_attr(struct igb_adapter *adapter,
  90                               unsigned int offset, int type)
  91 {
  92         int rc;
  93         unsigned int n_attr;
  94         struct hwmon_attr *igb_attr;
  95
  96         n_attr = adapter->igb_hwmon_buff->n_hwmon;
  97         igb_attr = &adapter->igb_hwmon_buff->hwmon_list[n_attr];
  98
  99         switch (type) {
 100         case IGB_HWMON_TYPE_LOC:
 101                 igb_attr->dev_attr.show = igb_hwmon_show_location;
 102                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 103                          "temp%u_label", offset + 1);
 104                 break;
 105         case IGB_HWMON_TYPE_TEMP:
 106                 igb_attr->dev_attr.show = igb_hwmon_show_temp;
 107                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 108                          "temp%u_input", offset + 1);
 109                 break;
 110         case IGB_HWMON_TYPE_CAUTION:
 111                 igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
 112                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 113                          "temp%u_max", offset + 1);
 114                 break;
 115         case IGB_HWMON_TYPE_MAX:
 116                 igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
 117                 snprintf(igb_attr->name, sizeof(igb_attr->name),
 118                          "temp%u_crit", offset + 1);
 119                 break;
 120         default:
 121                 rc = -EPERM;
 122                 return rc;
 123         }
 124
 125         /* These always the same regardless of type */
 126         igb_attr->sensor =
 127                 &adapter->hw.mac.thermal_sensor_data.sensor[offset];
 128         igb_attr->hw = &adapter->hw;
 129         igb_attr->dev_attr.store = NULL;
 130         igb_attr->dev_attr.attr.mode = 0444;
 131         igb_attr->dev_attr.attr.name = igb_attr->name;
 132         sysfs_attr_init(&igb_attr->dev_attr.attr);
 133
 134         adapter->igb_hwmon_buff->attrs[n_attr] = &igb_attr->dev_attr.attr;
 135
 136         ++adapter->igb_hwmon_buff->n_hwmon;
 137
 138         return 0;
 139 }
 140
 141 static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
 142 {
 143 }
 144
 145 /* called from igb_main.c */
 146 void igb_sysfs_exit(struct igb_adapter *adapter)
 147 {
 148         igb_sysfs_del_adapter(adapter);
 149 }
 150
 151 /* called from igb_main.c */
 152 int igb_sysfs_init(struct igb_adapter *adapter)
 153 {
 154         struct hwmon_buff *igb_hwmon;
 155         struct i2c_client *client;
 156         struct device *hwmon_dev;
 157         unsigned int i;
 158         int rc = 0;
 159
 160         /* If this method isn't defined we don't support thermals */
 161         if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL)
 162                 goto exit;
 163
 164         /* Don't create thermal hwmon interface if no sensors present */
 165         rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
 166         if (rc)
 167                 goto exit;
 168
 169         igb_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*igb_hwmon),
 170                                  GFP_KERNEL);
 171         if (!igb_hwmon) {
 172                 rc = -ENOMEM;
 173                 goto exit;
 174         }
 175         adapter->igb_hwmon_buff = igb_hwmon;
 176
 177         for (i = 0; i < E1000_MAX_SENSORS; i++) {
 178
 179                 /* Only create hwmon sysfs entries for sensors that have
 180                  * meaningful data.
 181                  */
 182                 if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
 183                         continue;
 184
 185                 /* Bail if any hwmon attr struct fails to initialize */
 186                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
 187                 if (rc)
 188                         goto exit;
 189                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
 190                 if (rc)
 191                         goto exit;
 192                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
 193                 if (rc)
 194                         goto exit;
 195                 rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
 196                 if (rc)
 197                         goto exit;
 198         }
 199
 200         /* init i2c_client */
 201         client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
 202         if (client == NULL) {
 203                 dev_info(&adapter->pdev->dev,
 204                          "Failed to create new i2c device.\n");
 205                 rc = -ENODEV;
 206                 goto exit;
 207         }
 208         adapter->i2c_client = client;
 209
 210         igb_hwmon->groups[0] = &igb_hwmon->group;
 211         igb_hwmon->group.attrs = igb_hwmon->attrs;
 212
 213         hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
 214                                                            client->name,
 215                                                            igb_hwmon,
 216                                                            igb_hwmon->groups);
 217         if (IS_ERR(hwmon_dev)) {
 218                 rc = PTR_ERR(hwmon_dev);
 219                 goto err;
 220         }
 221
 222         goto exit;
 223
 224 err:
 225         igb_sysfs_del_adapter(adapter);
 226 exit:
 227         return rc;
 228 }
 229 #endif