hwmon: Add a driver for the ADT7475 hardware monitoring chip
Hwmon driver for the ADT7475 chip.
Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475
new file mode 100644
index 0000000..a2b1abe
--- /dev/null
+++ b/Documentation/hwmon/adt7475
@@ -0,0 +1,87 @@
+This describes the interface for the ADT7475 driver:
+
+(there are 4 fans, numbered fan1 to fan4):
+
+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.
+
+(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.
+
+pwmX_enable Fan speed control method:
+
+ 0 - No control (fan at full speed)
+ 1 - Manual fan speed control (using pwm[1-*])
+ 2 - Automatic fan speed control
+
+pwmX_auto_channels_temp Select which channels affect this PWM
+
+ 1 - TEMP1 controls PWM
+ 2 - TEMP2 controls PWM
+ 4 - TEMP3 controls PWM
+ 6 - TEMP2 and TEMP3 control PWM
+ 7 - All three inputs control PWM
+
+pwmX_freq Read/write the PWM frequency in Hz. The number
+ should be one of the following:
+
+ 11 Hz
+ 14 Hz
+ 22 Hz
+ 29 Hz
+ 35 Hz
+ 44 Hz
+ 58 Hz
+ 88 Hz
+
+pwmX_auto_point1_pwm Read/write the minimum PWM duty cycle in automatic mode
+
+pwmX_auto_point2_pwm Read/write the maximum PWM duty cycle in automatic mode
+
+(there are three temperature settings numbered temp1 to temp3):
+
+tempX_input Read the current temperature. The value is in milli
+ degrees of Celsius.
+
+tempX_max Read/write the upper temperature limit - exceeding this
+ will cause an alarm.
+
+tempX_min Read/write the lower temperature limit - exceeding this
+ will cause an alarm.
+
+tempX_offset Read/write the temperature adjustment offset
+
+tempX_crit Read/write the THERM limit for remote1.
+
+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.