include/linux/hwmon.h

   1 /*
   2     hwmon.h - part of lm_sensors, Linux kernel modules for hardware monitoring
   3
   4     This file declares helper functions for the sysfs class "hwmon",
   5     for use by sensors drivers.
   6
   7     Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; version 2 of the License.
  12 */
  13
  14 #ifndef _HWMON_H_
  15 #define _HWMON_H_
  16
  17 #include <linux/bitops.h>
  18
  19 struct device;
  20 struct attribute_group;
  21
  22 enum hwmon_sensor_types {
  23         hwmon_chip,
  24         hwmon_temp,
  25         hwmon_in,
  26         hwmon_curr,
  27         hwmon_power,
  28         hwmon_energy,
  29 };
  30
  31 enum hwmon_chip_attributes {
  32         hwmon_chip_temp_reset_history,
  33         hwmon_chip_in_reset_history,
  34         hwmon_chip_register_tz,
  35         hwmon_chip_update_interval,
  36         hwmon_chip_alarms,
  37 };
  38
  39 #define HWMON_C_TEMP_RESET_HISTORY      BIT(hwmon_chip_temp_reset_history)
  40 #define HWMON_C_IN_RESET_HISTORY        BIT(hwmon_chip_in_reset_history)
  41 #define HWMON_C_REGISTER_TZ             BIT(hwmon_chip_register_tz)
  42 #define HWMON_C_UPDATE_INTERVAL         BIT(hwmon_chip_update_interval)
  43 #define HWMON_C_ALARMS                  BIT(hwmon_chip_alarms)
  44
  45 enum hwmon_temp_attributes {
  46         hwmon_temp_input = 0,
  47         hwmon_temp_type,
  48         hwmon_temp_lcrit,
  49         hwmon_temp_lcrit_hyst,
  50         hwmon_temp_min,
  51         hwmon_temp_min_hyst,
  52         hwmon_temp_max,
  53         hwmon_temp_max_hyst,
  54         hwmon_temp_crit,
  55         hwmon_temp_crit_hyst,
  56         hwmon_temp_emergency,
  57         hwmon_temp_emergency_hyst,
  58         hwmon_temp_alarm,
  59         hwmon_temp_lcrit_alarm,
  60         hwmon_temp_min_alarm,
  61         hwmon_temp_max_alarm,
  62         hwmon_temp_crit_alarm,
  63         hwmon_temp_emergency_alarm,
  64         hwmon_temp_fault,
  65         hwmon_temp_offset,
  66         hwmon_temp_label,
  67         hwmon_temp_lowest,
  68         hwmon_temp_highest,
  69         hwmon_temp_reset_history,
  70 };
  71
  72 #define HWMON_T_INPUT           BIT(hwmon_temp_input)
  73 #define HWMON_T_TYPE            BIT(hwmon_temp_type)
  74 #define HWMON_T_LCRIT           BIT(hwmon_temp_lcrit)
  75 #define HWMON_T_LCRIT_HYST      BIT(hwmon_temp_lcrit_hyst)
  76 #define HWMON_T_MIN             BIT(hwmon_temp_min)
  77 #define HWMON_T_MIN_HYST        BIT(hwmon_temp_min_hyst)
  78 #define HWMON_T_MAX             BIT(hwmon_temp_max)
  79 #define HWMON_T_MAX_HYST        BIT(hwmon_temp_max_hyst)
  80 #define HWMON_T_CRIT            BIT(hwmon_temp_crit)
  81 #define HWMON_T_CRIT_HYST       BIT(hwmon_temp_crit_hyst)
  82 #define HWMON_T_EMERGENCY       BIT(hwmon_temp_emergency)
  83 #define HWMON_T_EMERGENCY_HYST  BIT(hwmon_temp_emergency_hyst)
  84 #define HWMON_T_MIN_ALARM       BIT(hwmon_temp_min_alarm)
  85 #define HWMON_T_MAX_ALARM       BIT(hwmon_temp_max_alarm)
  86 #define HWMON_T_CRIT_ALARM      BIT(hwmon_temp_crit_alarm)
  87 #define HWMON_T_EMERGENCY_ALARM BIT(hwmon_temp_emergency_alarm)
  88 #define HWMON_T_FAULT           BIT(hwmon_temp_fault)
  89 #define HWMON_T_OFFSET          BIT(hwmon_temp_offset)
  90 #define HWMON_T_LABEL           BIT(hwmon_temp_label)
  91 #define HWMON_T_LOWEST          BIT(hwmon_temp_lowest)
  92 #define HWMON_T_HIGHEST         BIT(hwmon_temp_highest)
  93 #define HWMON_T_RESET_HISTORY   BIT(hwmon_temp_reset_history)
  94
  95 enum hwmon_in_attributes {
  96         hwmon_in_input,
  97         hwmon_in_min,
  98         hwmon_in_max,
  99         hwmon_in_lcrit,
 100         hwmon_in_crit,
 101         hwmon_in_average,
 102         hwmon_in_lowest,
 103         hwmon_in_highest,
 104         hwmon_in_reset_history,
 105         hwmon_in_label,
 106         hwmon_in_alarm,
 107         hwmon_in_min_alarm,
 108         hwmon_in_max_alarm,
 109         hwmon_in_lcrit_alarm,
 110         hwmon_in_crit_alarm,
 111 };
 112
 113 #define HWMON_I_INPUT           BIT(hwmon_in_input)
 114 #define HWMON_I_MIN             BIT(hwmon_in_min)
 115 #define HWMON_I_MAX             BIT(hwmon_in_max)
 116 #define HWMON_I_LCRIT           BIT(hwmon_in_lcrit)
 117 #define HWMON_I_CRIT            BIT(hwmon_in_crit)
 118 #define HWMON_I_AVERAGE         BIT(hwmon_in_average)
 119 #define HWMON_I_LOWEST          BIT(hwmon_in_lowest)
 120 #define HWMON_I_HIGHEST         BIT(hwmon_in_highest)
 121 #define HWMON_I_RESET_HISTORY   BIT(hwmon_in_reset_history)
 122 #define HWMON_I_LABEL           BIT(hwmon_in_label)
 123 #define HWMON_I_ALARM           BIT(hwmon_in_alarm)
 124 #define HWMON_I_MIN_ALARM       BIT(hwmon_in_min_alarm)
 125 #define HWMON_I_MAX_ALARM       BIT(hwmon_in_max_alarm)
 126 #define HWMON_I_LCRIT_ALARM     BIT(hwmon_in_lcrit_alarm)
 127 #define HWMON_I_CRIT_ALARM      BIT(hwmon_in_crit_alarm)
 128
 129 /**
 130  * struct hwmon_ops - hwmon device operations
 131  * @is_visible: Callback to return attribute visibility. Mandatory.
 132  *              Parameters are:
 133  *              @const void *drvdata:
 134  *                      Pointer to driver-private data structure passed
 135  *                      as argument to hwmon_device_register_with_info().
 136  *              @type:  Sensor type
 137  *              @attr:  Sensor attribute
 138  *              @channel:
 139  *                      Channel number
 140  *              The function returns the file permissions.
 141  *              If the return value is 0, no attribute will be created.
 142  * @read:       Read callback. Optional. If not provided, attributes
 143  *              will not be readable.
 144  *              Parameters are:
 145  *              @dev:   Pointer to hardware monitoring device
 146  *              @type:  Sensor type
 147  *              @attr:  Sensor attribute
 148  *              @channel:
 149  *                      Channel number
 150  *              @val:   Pointer to returned value
 151  *              The function returns 0 on success or a negative error number.
 152  * @write:      Write callback. Optional. If not provided, attributes
 153  *              will not be writable.
 154  *              Parameters are:
 155  *              @dev:   Pointer to hardware monitoring device
 156  *              @type:  Sensor type
 157  *              @attr:  Sensor attribute
 158  *              @channel:
 159  *                      Channel number
 160  *              @val:   Value to write
 161  *              The function returns 0 on success or a negative error number.
 162  */
 163 struct hwmon_ops {
 164         umode_t (*is_visible)(const void *drvdata, enum hwmon_sensor_types type,
 165                               u32 attr, int channel);
 166         int (*read)(struct device *dev, enum hwmon_sensor_types type,
 167                     u32 attr, int channel, long *val);
 168         int (*write)(struct device *dev, enum hwmon_sensor_types type,
 169                      u32 attr, int channel, long val);
 170 };
 171
 172 /**
 173  * Channel information
 174  * @type:       Channel type.
 175  * @config:     Pointer to NULL-terminated list of channel parameters.
 176  *              Use for per-channel attributes.
 177  */
 178 struct hwmon_channel_info {
 179         enum hwmon_sensor_types type;
 180         const u32 *config;
 181 };
 182
 183 /**
 184  * Chip configuration
 185  * @ops:        Pointer to hwmon operations.
 186  * @info:       Null-terminated list of channel information.
 187  */
 188 struct hwmon_chip_info {
 189         const struct hwmon_ops *ops;
 190         const struct hwmon_channel_info **info;
 191 };
 192
 193 struct device *hwmon_device_register(struct device *dev);
 194 struct device *
 195 hwmon_device_register_with_groups(struct device *dev, const char *name,
 196                                   void *drvdata,
 197                                   const struct attribute_group **groups);
 198 struct device *
 199 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 200                                        void *drvdata,
 201                                        const struct attribute_group **groups);
 202 struct device *
 203 hwmon_device_register_with_info(struct device *dev,
 204                                 const char *name, void *drvdata,
 205                                 const struct hwmon_chip_info *info,
 206                                 const struct attribute_group **groups);
 207 struct device *
 208 devm_hwmon_device_register_with_info(struct device *dev,
 209                                      const char *name, void *drvdata,
 210                                      const struct hwmon_chip_info *info,
 211                                      const struct attribute_group **groups);
 212
 213 void hwmon_device_unregister(struct device *dev);
 214 void devm_hwmon_device_unregister(struct device *dev);
 215
 216 #endif