hwmon: (adt7475) New documentation
New documentation for the adt7475 driver, based on the adt7473 driver
documentation. It is IMHO much more useful that the previous
documentation which was essentially redundant with sysfs-interface.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: "Mark M. Hoffman" <mhoffman@lightlink.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: "Darrick J. Wong" <djwong@us.ibm.com>
diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475
index a2b1abe..ebfee55 100644
--- a/Documentation/hwmon/adt7475
+++ b/Documentation/hwmon/adt7475
@@ -1,87 +1,83 @@
-This describes the interface for the ADT7475 driver:
+Kernel driver adt7475
+=====================
-(there are 4 fans, numbered fan1 to fan4):
+Supported chips:
+ * Analog Devices ADT7473
+ Prefix: 'adt7473'
+ Addresses scanned: I2C 0x2C, 0x2D, 0x2E
+ Datasheet: Publicly available at the On Semiconductors website
+ * Analog Devices ADT7475
+ Prefix: 'adt7475'
+ Addresses scanned: I2C 0x2E
+ Datasheet: Publicly available at the On Semiconductors website
-fanX_input Read the current speed of the fan (in RPMs)
-fanX_min Read/write the minimum speed of the fan. Dropping
- below this sets an alarm.
+Authors:
+ Jordan Crouse
+ Hans de Goede
+ Darrick J. Wong (documentation)
-(there are three PWMs, numbered pwm1 to pwm3):
-pwmX Read/write the current duty cycle of the PWM. Writes
- only have effect when auto mode is turned off (see
- below). Range is 0 - 255.
+Description
+-----------
-pwmX_enable Fan speed control method:
+This driver implements support for the Analog Devices ADT7473 and ADT7475
+chip family. Both chips differ only in minor details. They will be
+collectively designed by the name "ADT747x" in the rest of this document.
- 0 - No control (fan at full speed)
- 1 - Manual fan speed control (using pwm[1-*])
- 2 - Automatic fan speed control
+The ADT747x uses the 2-wire interface compatible with the SMBus 2.0
+specification. Using an analog to digital converter it measures three (3)
+temperatures and two (2) voltages. It has four (4) 16-bit counters for
+measuring fan speed. There are three (3) PWM outputs that can be used
+to control fan speed.
-pwmX_auto_channels_temp Select which channels affect this PWM
+A sophisticated control system for the PWM outputs is designed into the
+ADT747x that allows fan speed to be adjusted automatically based on any of the
+three temperature sensors. Each PWM output is individually adjustable and
+programmable. Once configured, the ADT747x will adjust the PWM outputs in
+response to the measured temperatures without further host intervention.
+This feature can also be disabled for manual control of the PWM's.
- 1 - TEMP1 controls PWM
- 2 - TEMP2 controls PWM
- 4 - TEMP3 controls PWM
- 6 - TEMP2 and TEMP3 control PWM
- 7 - All three inputs control PWM
+Each of the measured inputs (voltage, temperature, fan speed) has
+corresponding high/low limit values. The ADT747x will signal an ALARM if
+any measured value exceeds either limit.
-pwmX_freq Read/write the PWM frequency in Hz. The number
- should be one of the following:
+The ADT747x samples all inputs continuously. The driver will not read
+the registers more often than once every other second. Further,
+configuration data is only read once per minute.
- 11 Hz
- 14 Hz
- 22 Hz
- 29 Hz
- 35 Hz
- 44 Hz
- 58 Hz
- 88 Hz
+Special Features
+----------------
-pwmX_auto_point1_pwm Read/write the minimum PWM duty cycle in automatic mode
+The ADT747x has a 10-bit ADC and can therefore measure temperatures
+with a resolution of 0.25 degree Celsius. Temperature readings can be
+configured either for two's complement format or "Offset 64" format,
+wherein 64 is subtracted from the raw value to get the temperature value.
-pwmX_auto_point2_pwm Read/write the maximum PWM duty cycle in automatic mode
+The datasheet is very detailed and describes a procedure for determining
+an optimal configuration for the automatic PWM control.
-(there are three temperature settings numbered temp1 to temp3):
+Fan Speed Control
+-----------------
-tempX_input Read the current temperature. The value is in milli
- degrees of Celsius.
+The driver exposes two trip points per PWM channel.
-tempX_max Read/write the upper temperature limit - exceeding this
- will cause an alarm.
+point1: Set the PWM speed at the lower temperature bound
+point2: Set the PWM speed at the higher temperature bound
-tempX_min Read/write the lower temperature limit - exceeding this
- will cause an alarm.
+The ADT747x will scale the PWM linearly between the lower and higher PWM
+speed when the temperature is between the two temperature boundaries.
+Temperature boundaries are associated to temperature channels rather than
+PWM outputs, and a given PWM output can be controlled by several temperature
+channels. As a result, the ADT747x may compute more than one PWM value
+for a channel at a given time, in which case the maximum value (fastest
+fan speed) is applied. PWM values range from 0 (off) to 255 (full speed).
-tempX_offset Read/write the temperature adjustment offset
+Fan speed may be set to maximum when the temperature sensor associated with
+the PWM control exceeds temp#_max.
-tempX_crit Read/write the THERM limit for remote1.
+Notes
+-----
-tempX_crit_hyst Set the temperature value below crit where the
- fans will stay on - this helps drive the temperature
- low enough so it doesn't stay near the edge and
- cause THERM to keep tripping.
-
-tempX_auto_point1_temp Read/write the minimum temperature where the fans will
- turn on in automatic mode.
-
-tempX_auto_point2_temp Read/write the maximum temperature over which the fans
- will run in automatic mode. tempX_auto_point1_temp
- and tempX_auto_point2_temp together define the
- range of automatic control.
-
-tempX_alarm Read a 1 if the max/min alarm is set
-tempX_fault Read a 1 if either temp1 or temp3 diode has a fault
-
-(There are two voltage settings, in1 and in2):
-
-inX_input Read the current voltage on VCC. Value is in
- millivolts.
-
-inX_min read/write the minimum voltage limit.
- Dropping below this causes an alarm.
-
-inX_max read/write the maximum voltage limit.
- Exceeding this causes an alarm.
-
-inX_alarm Read a 1 if the max/min alarm is set.
+The nVidia binary driver presents an ADT7473 chip via an on-card i2c bus.
+Unfortunately, they fail to set the i2c adapter class, so this driver may
+fail to find the chip until the nvidia driver is patched.