diff options
Diffstat (limited to 'Documentation/hwmon/adt7473')
| -rw-r--r-- | Documentation/hwmon/adt7473 | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/Documentation/hwmon/adt7473 b/Documentation/hwmon/adt7473 deleted file mode 100644 index 446612bd1fb9..000000000000 --- a/Documentation/hwmon/adt7473 +++ /dev/null | |||
| @@ -1,74 +0,0 @@ | |||
| 1 | Kernel driver adt7473 | ||
| 2 | ====================== | ||
| 3 | |||
| 4 | Supported chips: | ||
| 5 | * Analog Devices ADT7473 | ||
| 6 | Prefix: 'adt7473' | ||
| 7 | Addresses scanned: I2C 0x2C, 0x2D, 0x2E | ||
| 8 | Datasheet: Publicly available at the Analog Devices website | ||
| 9 | |||
| 10 | Author: Darrick J. Wong | ||
| 11 | |||
| 12 | This driver is depreacted, please use the adt7475 driver instead. | ||
| 13 | |||
| 14 | Description | ||
| 15 | ----------- | ||
| 16 | |||
| 17 | This driver implements support for the Analog Devices ADT7473 chip family. | ||
| 18 | |||
| 19 | The ADT7473 uses the 2-wire interface compatible with the SMBUS 2.0 | ||
| 20 | specification. Using an analog to digital converter it measures three (3) | ||
| 21 | temperatures and two (2) voltages. It has four (4) 16-bit counters for | ||
| 22 | measuring fan speed. There are three (3) PWM outputs that can be used | ||
| 23 | to control fan speed. | ||
| 24 | |||
| 25 | A sophisticated control system for the PWM outputs is designed into the | ||
| 26 | ADT7473 that allows fan speed to be adjusted automatically based on any of the | ||
| 27 | three temperature sensors. Each PWM output is individually adjustable and | ||
| 28 | programmable. Once configured, the ADT7473 will adjust the PWM outputs in | ||
| 29 | response to the measured temperatures without further host intervention. | ||
| 30 | This feature can also be disabled for manual control of the PWM's. | ||
| 31 | |||
| 32 | Each of the measured inputs (voltage, temperature, fan speed) has | ||
| 33 | corresponding high/low limit values. The ADT7473 will signal an ALARM if | ||
| 34 | any measured value exceeds either limit. | ||
| 35 | |||
| 36 | The ADT7473 samples all inputs continuously. The driver will not read | ||
| 37 | the registers more often than once every other second. Further, | ||
| 38 | configuration data is only read once per minute. | ||
| 39 | |||
| 40 | Special Features | ||
| 41 | ---------------- | ||
| 42 | |||
| 43 | The ADT7473 have a 10-bit ADC and can therefore measure temperatures | ||
| 44 | with 0.25 degC resolution. Temperature readings can be configured either | ||
| 45 | for twos complement format or "Offset 64" format, wherein 63 is subtracted | ||
| 46 | from the raw value to get the temperature value. | ||
| 47 | |||
| 48 | The Analog Devices datasheet is very detailed and describes a procedure for | ||
| 49 | determining an optimal configuration for the automatic PWM control. | ||
| 50 | |||
| 51 | Configuration Notes | ||
| 52 | ------------------- | ||
| 53 | |||
| 54 | Besides standard interfaces driver adds the following: | ||
| 55 | |||
| 56 | * PWM Control | ||
| 57 | |||
| 58 | * pwm#_auto_point1_pwm and temp#_auto_point1_temp and | ||
| 59 | * pwm#_auto_point2_pwm and temp#_auto_point2_temp - | ||
| 60 | |||
| 61 | point1: Set the pwm speed at a lower temperature bound. | ||
| 62 | point2: Set the pwm speed at a higher temperature bound. | ||
| 63 | |||
| 64 | The ADT7473 will scale the pwm between the lower and higher pwm speed when | ||
| 65 | the temperature is between the two temperature boundaries. PWM values range | ||
| 66 | from 0 (off) to 255 (full speed). Fan speed will be set to maximum when the | ||
| 67 | temperature sensor associated with the PWM control exceeds temp#_max. | ||
| 68 | |||
| 69 | Notes | ||
| 70 | ----- | ||
| 71 | |||
| 72 | The NVIDIA binary driver presents an ADT7473 chip via an on-card i2c bus. | ||
| 73 | Unfortunately, they fail to set the i2c adapter class, so this driver may | ||
| 74 | fail to find the chip until the nvidia driver is patched. | ||