mirror of https://gitee.com/openkylin/linux.git
114 lines
3.4 KiB
Plaintext
114 lines
3.4 KiB
Plaintext
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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/W83791Da.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@sh.cvut.cz>
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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.
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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 for fan 1/2/3
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and 1, 2, 4, 8, 16, 32, 64 or 128 for fan 4/5) to give the readings more
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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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Alarms are provided as output from a "realtime status register". The
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following bits are defined:
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bit - alarm on:
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0 - Vcore
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1 - VINR0
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2 - +3.3VIN
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3 - 5VDD
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4 - temp1
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5 - temp2
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6 - fan1
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7 - fan2
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8 - +12VIN
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9 - -12VIN
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10 - -5VIN
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11 - fan3
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12 - chassis
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13 - temp3
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14 - VINR1
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15 - reserved
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16 - tart1
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17 - tart2
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18 - tart3
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19 - VSB
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20 - VBAT
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21 - fan4
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22 - fan5
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23 - reserved
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When an alarm goes off, you can be warned by a beeping signal through your
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computer speaker. It is possible to enable all beeping globally, or only
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the beeping for some alarms.
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The driver only reads the chip values each 3 seconds; reading them more
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often will do no harm, but will return 'old' values.
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W83791D TODO:
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---------------
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Provide a patch for per-file alarms as discussed on the mailing list
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Provide a patch for smart-fan control (still need appropriate motherboard/fans)
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