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