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