Documentation/hwmon/max34440

   1 Kernel driver max34440
   2 ======================
   3
   4 Supported chips:
   5   * Maxim MAX34440
   6     Prefixes: 'max34440'
   7     Addresses scanned: -
   8     Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34440.pdf
   9   * Maxim MAX34441
  10     PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
  11     Prefixes: 'max34441'
  12     Addresses scanned: -
  13     Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34441.pdf
  14   * Maxim MAX34446
  15     PMBus Power-Supply Data Logger
  16     Prefixes: 'max34446'
  17     Addresses scanned: -
  18     Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34446.pdf
  19   * Maxim MAX34460
  20     PMBus 12-Channel Voltage Monitor & Sequencer
  21     Prefix: 'max34460'
  22     Addresses scanned: -
  23     Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34460.pdf
  24   * Maxim MAX34461
  25     PMBus 16-Channel Voltage Monitor & Sequencer
  26     Prefix: 'max34461'
  27     Addresses scanned: -
  28     Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34461.pdf
  29
  30 Author: Guenter Roeck <linux@roeck-us.net>
  31
  32
  33 Description
  34 -----------
  35
  36 This driver supports hardware monitoring for Maxim MAX34440 PMBus 6-Channel
  37 Power-Supply Manager, MAX34441 PMBus 5-Channel Power-Supply Manager
  38 and Intelligent Fan Controller, and MAX34446 PMBus Power-Supply Data Logger.
  39 It also supports the MAX34460 and MAX34461 PMBus Voltage Monitor & Sequencers.
  40 The MAX34460 supports 12 voltage channels, and the MAX34461 supports 16 voltage
  41 channels.
  42
  43 The driver is a client driver to the core PMBus driver. Please see
  44 Documentation/hwmon/pmbus for details on PMBus client drivers.
  45
  46
  47 Usage Notes
  48 -----------
  49
  50 This driver does not auto-detect devices. You will have to instantiate the
  51 devices explicitly. Please see Documentation/i2c/instantiating-devices for
  52 details.
  53
  54 For MAX34446, the value of the currX_crit attribute determines if current or
  55 voltage measurement is enabled for a given channel. Voltage measurement is
  56 enabled if currX_crit is set to 0; current measurement is enabled if the
  57 attribute is set to a positive value. Power measurement is only enabled if
  58 channel 1 (3) is configured for voltage measurement, and channel 2 (4) is
  59 configured for current measurement.
  60
  61
  62 Platform data support
  63 ---------------------
  64
  65 The driver supports standard PMBus driver platform data.
  66
  67
  68 Sysfs entries
  69 -------------
  70
  71 The following attributes are supported. Limits are read-write; all other
  72 attributes are read-only.
  73
  74 in[1-6]_label           "vout[1-6]".
  75 in[1-6]_input           Measured voltage. From READ_VOUT register.
  76 in[1-6]_min             Minimum Voltage. From VOUT_UV_WARN_LIMIT register.
  77 in[1-6]_max             Maximum voltage. From VOUT_OV_WARN_LIMIT register.
  78 in[1-6]_lcrit           Critical minimum Voltage. VOUT_UV_FAULT_LIMIT register.
  79 in[1-6]_crit            Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.
  80 in[1-6]_min_alarm       Voltage low alarm. From VOLTAGE_UV_WARNING status.
  81 in[1-6]_max_alarm       Voltage high alarm. From VOLTAGE_OV_WARNING status.
  82 in[1-6]_lcrit_alarm     Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
  83 in[1-6]_crit_alarm      Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
  84 in[1-6]_lowest          Historical minimum voltage.
  85 in[1-6]_highest         Historical maximum voltage.
  86 in[1-6]_reset_history   Write any value to reset history.
  87
  88                         MAX34446 only supports in[1-4].
  89
  90 curr[1-6]_label         "iout[1-6]".
  91 curr[1-6]_input         Measured current. From READ_IOUT register.
  92 curr[1-6]_max           Maximum current. From IOUT_OC_WARN_LIMIT register.
  93 curr[1-6]_crit          Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
  94 curr[1-6]_max_alarm     Current high alarm. From IOUT_OC_WARNING status.
  95 curr[1-6]_crit_alarm    Current critical high alarm. From IOUT_OC_FAULT status.
  96 curr[1-4]_average       Historical average current (MAX34446 only).
  97 curr[1-6]_highest       Historical maximum current.
  98 curr[1-6]_reset_history Write any value to reset history.
  99
 100                         in6 and curr6 attributes only exist for MAX34440.
 101                         MAX34446 only supports curr[1-4].
 102
 103 power[1,3]_label        "pout[1,3]"
 104 power[1,3]_input        Measured power.
 105 power[1,3]_average      Historical average power.
 106 power[1,3]_highest      Historical maximum power.
 107
 108                         Power attributes only exist for MAX34446.
 109
 110 temp[1-8]_input         Measured temperatures. From READ_TEMPERATURE_1 register.
 111                         temp1 is the chip's internal temperature. temp2..temp5
 112                         are remote I2C temperature sensors. For MAX34441, temp6
 113                         is a remote thermal-diode sensor. For MAX34440, temp6..8
 114                         are remote I2C temperature sensors.
 115 temp[1-8]_max           Maximum temperature. From OT_WARN_LIMIT register.
 116 temp[1-8]_crit          Critical high temperature. From OT_FAULT_LIMIT register.
 117 temp[1-8]_max_alarm     Temperature high alarm.
 118 temp[1-8]_crit_alarm    Temperature critical high alarm.
 119 temp[1-8]_average       Historical average temperature (MAX34446 only).
 120 temp[1-8]_highest       Historical maximum temperature.
 121 temp[1-8]_reset_history Write any value to reset history.
 122
 123                         temp7 and temp8 attributes only exist for MAX34440.
 124                         MAX34446 only supports temp[1-3].
 125
 126 MAX34460 supports attribute groups in[1-12] and temp[1-5].
 127 MAX34461 supports attribute groups in[1-16] and temp[1-5].