projects / linux-2.6-block.git / blame
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1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | Kernel driver gsc-hwmon | |
| 4 | ======================= | |
| 5 | ||
| 6 | Supported chips: Gateworks GSC | |
| 7 | Datasheet: http://trac.gateworks.com/wiki/gsc | |
| 8 | Author: Tim Harvey <tharvey@gateworks.com> | |
| 9 | ||
| 10 | Description: | |
| 11 | ------------ | |
| 12 | ||
| 13 | This driver supports hardware monitoring for the temperature sensor, | |
| 14 | various ADC's connected to the GSC, and optional FAN controller available | |
| 15 | on some boards. | |
| 16 | ||
| 17 | ||
| 18 | Voltage Monitoring | |
| 19 | ------------------ | |
| 20 | ||
| 21 | The voltage inputs are scaled either internally or by the driver depending | |
| 22 | on the GSC version and firmware. The values returned by the driver do not need | |
| 23 | further scaling. The voltage input labels provide the voltage rail name: | |
| 24 | ||
| 25 | inX_input Measured voltage (mV). | |
| 26 | inX_label Name of voltage rail. | |
| 27 | ||
| 28 | ||
| 29 | Temperature Monitoring | |
| 30 | ---------------------- | |
| 31 | ||
| 32 | Temperatures are measured with 12-bit or 10-bit resolution and are scaled | |
| 33 | either internally or by the driver depending on the GSC version and firmware. | |
| 12087a36 | 34 | The values returned by the driver reflect millidegree Celsius: |
| 3bce5377 TH |
35 | |
| 36 | tempX_input Measured temperature. | |
| 37 | tempX_label Name of temperature input. | |
| 38 | ||
| 39 | ||
| 40 | PWM Output Control | |
| 41 | ------------------ | |
| 42 | ||
| 43 | The GSC features 1 PWM output that operates in automatic mode where the | |
| 12087a36 RD |
44 | PWM value will be scaled depending on 6 temperature boundaries. |
| 45 | The tempeature boundaries are read-write and in millidegree Celsius and the | |
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46 | read-only PWM values range from 0 (off) to 255 (full speed). |
| 47 | Fan speed will be set to minimum (off) when the temperature sensor reads | |
| 48 | less than pwm1_auto_point1_temp and maximum when the temperature sensor | |
| 49 | equals or exceeds pwm1_auto_point6_temp. | |
| 50 | ||
| 51 | pwm1_auto_point[1-6]_pwm PWM value. | |
| 52 | pwm1_auto_point[1-6]_temp Temperature boundary. | |
| 53 |