hwmon: (lm93) Documentation fixes

    Addresses scanned: I2C 0x2c-0x2e

    Datasheet: http://www.national.com/ds.cgi/LM/LM93.pdf

Author:

Authors:

	Mark M. Hoffman <mhoffman@lightlink.com>

	Ported to 2.6 by Eric J. Bowersox <ericb@aspsys.com>

	Adapted to 2.6.20 by Carsten Emde <ce@osadl.org>

Module Parameters

-----------------

(specific to LM93)

* init: integer

  Set to non-zero to force some initializations (default is 0).

* disable_block: integer

  I.e. this parameter controls the VID pin input thresholds; if your VID

  inputs are not working, try changing this.  The default value is "0".

(common among sensor drivers)

* force: short array (min = 1, max = 48)

  List of adapter,address pairs to assume to be present.  Autodetection

  of the target device will still be attempted.  Use one of the more

  specific force directives below if this doesn't detect the device.

* force_lm93: short array (min = 1, max = 48)

  List of adapter,address pairs which are unquestionably assumed to contain

  a 'lm93' chip

* ignore: short array (min = 1, max = 48)

  List of adapter,address pairs not to scan

* ignore_range: short array (min = 1, max = 48)

  List of adapter,start-addr,end-addr triples not to scan

* probe: short array (min = 1, max = 48)

  List of adapter,address pairs to scan additionally

* probe_range: short array (min = 1, max = 48)

  List of adapter,start-addr,end-addr triples to scan additionally

Hardware Description

--------------------

(from the datasheet)

The LM93, hardware monitor, has a two wire digital interface compatible with

The LM93 hardware monitor has a two wire digital interface compatible with

SMBus 2.0. Using an 8-bit ADC, the LM93 measures the temperature of two remote

diode connected transistors as well as its own die and 16 power supply

voltages. To set fan speed, the LM93 has two PWM outputs that are each

temperature readings for better control of fan speed. The LM93 has four

tachometer inputs to measure fan speed. Limit and status registers for all

measured values are included. The LM93 builds upon the functionality of

previous motherboard management ASICs and uses some of the LM85 s features

previous motherboard management ASICs and uses some of the LM85's features

(i.e. smart tachometer mode). It also adds measurement and control support

for dynamic Vccp monitoring and PROCHOT. It is designed to monitor a dual

processor Xeon class motherboard with a minimum of external components.

Driver Description

------------------

This driver implements support for the National Semiconductor LM93.

User Interface

--------------

prochot2_interval.  The values in these files specify the intervals for

#P1_PROCHOT and #P2_PROCHOT, respectively.  Selecting a value not in this

list will cause the driver to use the next largest interval.  The available

intervals are:

intervals are (in seconds):

#PROCHOT intervals: 0.73, 1.46, 2.9, 5.8, 11.7, 23.3, 46.6, 93.2, 186, 372

non-zero integer to the sysfs file prochot_short.

The LM93 can also override the #PROCHOT pins by driving a PWM signal onto

one or both of them.  When overridden, the signal has a period of 3.56 mS,

one or both of them.  When overridden, the signal has a period of 3.56 ms,

a minimum pulse width of 5 clocks (at 22.5kHz => 6.25% duty cycle), and

a maximum pulse width of 80 clocks (at 22.5kHz => 99.88% duty cycle).

The sysfs files prochot1_override and prochot2_override contain boolean

intgers which enable or disable the override function for #P1_PROCHOT and

integers which enable or disable the override function for #P1_PROCHOT and

#P2_PROCHOT, respectively.  The sysfs file prochot_override_duty_cycle

contains a value controlling the duty cycle for the PWM signal used when

the override function is enabled.  This value ranges from 0 to 15, with 0

not available will cause the driver to use the next largest value.  Also note

that this parameter has implications for the Smart Tach Mode (see above).

PWM Output Frequencies: 12, 36, 48, 60, 72, 84, 96, 22500 (h/w default)

PWM Output Frequencies (in Hz): 12, 36, 48, 60, 72, 84, 96, 22500 (default)

Automatic PWM:

	gpio			input state of 8 GPIO pins; read-only

Sample Configuration File

-------------------------

Here is a sample LM93 chip config for sensors.conf:

---------- cut here ----------

chip "lm93-*"

# VOLTAGE INPUTS

	# labels and scaling based on datasheet recommendations

	label in1	"+12V1"

	compute in1	@ * 12.945, @ / 12.945

	set in1_min	12 * 0.90

	set in1_max	12 * 1.10

	label in2	"+12V2"

	compute in2	@ * 12.945, @ / 12.945

	set in2_min	12 * 0.90

	set in2_max	12 * 1.10

	label in3	"+12V3"

	compute in3	@ * 12.945, @ / 12.945

	set in3_min	12 * 0.90

	set in3_max	12 * 1.10

	label in4	"FSB_Vtt"

	label in5	"3GIO"

	label in6	"ICH_Core"

	label in7	"Vccp1"

	label in8	"Vccp2"

	label in9	"+3.3V"

	set in9_min	3.3 * 0.90

	set in9_max	3.3 * 1.10

	label in10	"+5V"

	set in10_min	5.0 * 0.90

	set in10_max	5.0 * 1.10

	label in11	"SCSI_Core"

	label in12	"Mem_Core"

	label in13	"Mem_Vtt"

	label in14	"Gbit_Core"

	# Assuming R1/R2 = 4.1143, and 3.3V reference

	# -12V = (4.1143 + 1) * (@ - 3.3) + 3.3

	label in15	"-12V"

	compute in15 @ * 5.1143 - 13.57719, (@ + 13.57719) / 5.1143

	set in15_min	-12 * 0.90

	set in15_max	-12 * 1.10

	label in16	"+3.3VSB"

	set in16_min	3.3 * 0.90

	set in16_max	3.3 * 1.10

# TEMPERATURE INPUTS

	label temp1	"CPU1"

	label temp2	"CPU2"

	label temp3	"LM93"

# TACHOMETER INPUTS

	label fan1	"Fan1"

	set fan1_min	3000

	label fan2	"Fan2"

	set fan2_min	3000

	label fan3	"Fan3"

	set fan3_min	3000

	label fan4	"Fan4"

	set fan4_min	3000

# PWM OUTPUTS

	label pwm1	"CPU1"

	label pwm2	"CPU2"