mirror of https://gitee.com/openkylin/linux.git
139 lines
5.8 KiB
Plaintext
139 lines
5.8 KiB
Plaintext
Kernel driver w83791d
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=====================
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Supported chips:
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* Winbond W83791D
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Prefix: 'w83791d'
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Addresses scanned: I2C 0x2c - 0x2f
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Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83791D_W83791Gb.pdf
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Author: Charles Spirakis <bezaur@gmail.com>
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This driver was derived from the w83781d.c and w83792d.c source files.
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Credits:
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w83781d.c:
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Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>,
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and Mark Studebaker <mdsxyz123@yahoo.com>
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w83792d.c:
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Chunhao Huang <DZShen@Winbond.com.tw>,
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Rudolf Marek <r.marek@assembler.cz>
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Additional contributors:
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Sven Anders <anders@anduras.de>
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Marc Hulsman <m.hulsman@tudelft.nl>
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Module Parameters
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-----------------
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* init boolean
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(default 0)
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Use 'init=1' to have the driver do extra software initializations.
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The default behavior is to do the minimum initialization possible
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and depend on the BIOS to properly setup the chip. If you know you
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have a w83791d and you're having problems, try init=1 before trying
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reset=1.
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* reset boolean
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(default 0)
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Use 'reset=1' to reset the chip (via index 0x40, bit 7). The default
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behavior is no chip reset to preserve BIOS settings.
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* force_subclients=bus,caddr,saddr,saddr
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This is used to force the i2c addresses for subclients of
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a certain chip. Example usage is `force_subclients=0,0x2f,0x4a,0x4b'
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to force the subclients of chip 0x2f on bus 0 to i2c addresses
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0x4a and 0x4b.
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Description
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-----------
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This driver implements support for the Winbond W83791D chip. The W83791G
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chip appears to be the same as the W83791D but is lead free.
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Detection of the chip can sometimes be foiled because it can be in an
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internal state that allows no clean access (Bank with ID register is not
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currently selected). If you know the address of the chip, use a 'force'
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parameter; this will put it into a more well-behaved state first.
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The driver implements three temperature sensors, five fan rotation speed
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sensors, and ten voltage sensors.
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Temperatures are measured in degrees Celsius and measurement resolution is 1
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degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when
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the temperature gets higher than the Overtemperature Shutdown value; it stays
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on until the temperature falls below the Hysteresis value.
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Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
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triggered if the rotation speed has dropped below a programmable limit. Fan
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readings can be divided by a programmable divider (1, 2, 4, 8, 16,
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32, 64 or 128 for all fans) to give the readings more range or accuracy.
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Voltage sensors (also known as IN sensors) report their values in millivolts.
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An alarm is triggered if the voltage has crossed a programmable minimum
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or maximum limit.
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The w83791d has a global bit used to enable beeping from the speaker when an
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alarm is triggered as well as a bitmask to enable or disable the beep for
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specific alarms. You need both the global beep enable bit and the
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corresponding beep bit to be on for a triggered alarm to sound a beep.
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The sysfs interface to the gloabal enable is via the sysfs beep_enable file.
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This file is used for both legacy and new code.
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The sysfs interface to the beep bitmask has migrated from the original legacy
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method of a single sysfs beep_mask file to a newer method using multiple
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*_beep files as described in .../Documentation/hwmon/sysfs-interface.
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A similar change has occured for the bitmap corresponding to the alarms. The
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original legacy method used a single sysfs alarms file containing a bitmap
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of triggered alarms. The newer method uses multiple sysfs *_alarm files
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(again following the pattern described in sysfs-interface).
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Since both methods read and write the underlying hardware, they can be used
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interchangeably and changes in one will automatically be reflected by
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the other. If you use the legacy bitmask method, your user-space code is
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responsible for handling the fact that the alarms and beep_mask bitmaps
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are not the same (see the table below).
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NOTE: All new code should be written to use the newer sysfs-interface
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specification as that avoids bitmap problems and is the preferred interface
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going forward.
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The driver reads the hardware chip values at most once every three seconds.
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User mode code requesting values more often will receive cached values.
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Alarms bitmap vs. beep_mask bitmask
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------------------------------------
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For legacy code using the alarms and beep_mask files:
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in0 (VCORE) : alarms: 0x000001 beep_mask: 0x000001
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in1 (VINR0) : alarms: 0x000002 beep_mask: 0x002000 <== mismatch
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in2 (+3.3VIN): alarms: 0x000004 beep_mask: 0x000004
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in3 (5VDD) : alarms: 0x000008 beep_mask: 0x000008
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in4 (+12VIN) : alarms: 0x000100 beep_mask: 0x000100
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in5 (-12VIN) : alarms: 0x000200 beep_mask: 0x000200
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in6 (-5VIN) : alarms: 0x000400 beep_mask: 0x000400
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in7 (VSB) : alarms: 0x080000 beep_mask: 0x010000 <== mismatch
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in8 (VBAT) : alarms: 0x100000 beep_mask: 0x020000 <== mismatch
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in9 (VINR1) : alarms: 0x004000 beep_mask: 0x004000
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temp1 : alarms: 0x000010 beep_mask: 0x000010
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temp2 : alarms: 0x000020 beep_mask: 0x000020
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temp3 : alarms: 0x002000 beep_mask: 0x000002 <== mismatch
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fan1 : alarms: 0x000040 beep_mask: 0x000040
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fan2 : alarms: 0x000080 beep_mask: 0x000080
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fan3 : alarms: 0x000800 beep_mask: 0x000800
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fan4 : alarms: 0x200000 beep_mask: 0x200000
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fan5 : alarms: 0x400000 beep_mask: 0x400000
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tart1 : alarms: 0x010000 beep_mask: 0x040000 <== mismatch
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tart2 : alarms: 0x020000 beep_mask: 0x080000 <== mismatch
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tart3 : alarms: 0x040000 beep_mask: 0x100000 <== mismatch
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case_open : alarms: 0x001000 beep_mask: 0x001000
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global_enable: alarms: -------- beep_mask: 0x800000 (modified via beep_enable)
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W83791D TODO:
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---------------
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Provide a patch for smart-fan control (still need appropriate motherboard/fans)
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