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- Kernel driver amc6821
- =====================
- Supported chips:
- Texas Instruments AMC6821
- Prefix: 'amc6821'
- Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
- Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html
- Authors:
- Tomaz Mertelj <tomaz.mertelj@guest.arnes.si>
- Description
- -----------
- This driver implements support for the Texas Instruments amc6821 chip.
- The chip has one on-chip and one remote temperature sensor and one pwm fan
- regulator.
- The pwm can be controlled either from software or automatically.
- The driver provides the following sensor accesses in sysfs:
- temp1_input ro on-chip temperature
- temp1_min rw "
- temp1_max rw "
- temp1_crit rw "
- temp1_min_alarm ro "
- temp1_max_alarm ro "
- temp1_crit_alarm ro "
- temp2_input ro remote temperature
- temp2_min rw "
- temp2_max rw "
- temp2_crit rw "
- temp2_min_alarm ro "
- temp2_max_alarm ro "
- temp2_crit_alarm ro "
- temp2_fault ro "
- fan1_input ro tachometer speed
- fan1_min rw "
- fan1_max rw "
- fan1_fault ro "
- fan1_div rw Fan divisor can be either 2 or 4.
- pwm1 rw pwm1
- pwm1_enable rw regulator mode, 1=open loop, 2=fan controlled
- by remote temperature, 3=fan controlled by
- combination of the on-chip temperature and
- remote-sensor temperature,
- pwm1_auto_channels_temp ro 1 if pwm_enable==2, 3 if pwm_enable==3
- pwm1_auto_point1_pwm ro Hardwired to 0, shared for both
- temperature channels.
- pwm1_auto_point2_pwm rw This value is shared for both temperature
- channels.
- pwm1_auto_point3_pwm rw Hardwired to 255, shared for both
- temperature channels.
- temp1_auto_point1_temp ro Hardwired to temp2_auto_point1_temp
- which is rw. Below this temperature fan stops.
- temp1_auto_point2_temp rw The low-temperature limit of the proportional
- range. Below this temperature
- pwm1 = pwm1_auto_point2_pwm. It can go from
- 0 degree C to 124 degree C in steps of
- 4 degree C. Read it out after writing to get
- the actual value.
- temp1_auto_point3_temp rw Above this temperature fan runs at maximum
- speed. It can go from temp1_auto_point2_temp.
- It can only have certain discrete values
- which depend on temp1_auto_point2_temp and
- pwm1_auto_point2_pwm. Read it out after
- writing to get the actual value.
- temp2_auto_point1_temp rw Must be between 0 degree C and 63 degree C and
- it defines the passive cooling temperature.
- Below this temperature the fan stops in
- the closed loop mode.
- temp2_auto_point2_temp rw The low-temperature limit of the proportional
- range. Below this temperature
- pwm1 = pwm1_auto_point2_pwm. It can go from
- 0 degree C to 124 degree C in steps
- of 4 degree C.
- temp2_auto_point3_temp rw Above this temperature fan runs at maximum
- speed. It can only have certain discrete
- values which depend on temp2_auto_point2_temp
- and pwm1_auto_point2_pwm. Read it out after
- writing to get actual value.
- Module parameters
- -----------------
- If your board has a BIOS that initializes the amc6821 correctly, you should
- load the module with: init=0.
- If your board BIOS doesn't initialize the chip, or you want
- different settings, you can set the following parameters:
- init=1,
- pwminv: 0 default pwm output, 1 inverts pwm output.
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