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authorAmerigo Wang <amwang@redhat.com>2010-03-05 16:17:26 -0500
committerJean Delvare <khali@linux-fr.org>2010-03-05 16:17:26 -0500
commita0a5e3488a51c46f383c5faa86b53828e30ce153 (patch)
treebe2df675c0fb15d477591d946ef6200cfecdfe69 /Documentation/hwmon
parentdc71afe5ac7e8d049bb991330518e4c898a7d92e (diff)
hwmon: Remove the deprecated adt7473 driver
adt7473 driver is obsoleted by adt7475 driver. And it is scheduled to be removed in Feb 2010. Signed-off-by: WANG Cong <amwang@redhat.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/hwmon')
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1 files changed, 0 insertions, 74 deletions
diff --git a/Documentation/hwmon/adt7473 b/Documentation/hwmon/adt7473
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1Kernel driver adt7473
2======================
3
4Supported 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
10Author: Darrick J. Wong
11
12This driver is depreacted, please use the adt7475 driver instead.
13
14Description
15-----------
16
17This driver implements support for the Analog Devices ADT7473 chip family.
18
19The ADT7473 uses the 2-wire interface compatible with the SMBUS 2.0
20specification. Using an analog to digital converter it measures three (3)
21temperatures and two (2) voltages. It has four (4) 16-bit counters for
22measuring fan speed. There are three (3) PWM outputs that can be used
23to control fan speed.
24
25A sophisticated control system for the PWM outputs is designed into the
26ADT7473 that allows fan speed to be adjusted automatically based on any of the
27three temperature sensors. Each PWM output is individually adjustable and
28programmable. Once configured, the ADT7473 will adjust the PWM outputs in
29response to the measured temperatures without further host intervention.
30This feature can also be disabled for manual control of the PWM's.
31
32Each of the measured inputs (voltage, temperature, fan speed) has
33corresponding high/low limit values. The ADT7473 will signal an ALARM if
34any measured value exceeds either limit.
35
36The ADT7473 samples all inputs continuously. The driver will not read
37the registers more often than once every other second. Further,
38configuration data is only read once per minute.
39
40Special Features
41----------------
42
43The ADT7473 have a 10-bit ADC and can therefore measure temperatures
44with 0.25 degC resolution. Temperature readings can be configured either
45for twos complement format or "Offset 64" format, wherein 63 is subtracted
46from the raw value to get the temperature value.
47
48The Analog Devices datasheet is very detailed and describes a procedure for
49determining an optimal configuration for the automatic PWM control.
50
51Configuration Notes
52-------------------
53
54Besides 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
61point1: Set the pwm speed at a lower temperature bound.
62point2: Set the pwm speed at a higher temperature bound.
63
64The ADT7473 will scale the pwm between the lower and higher pwm speed when
65the temperature is between the two temperature boundaries. PWM values range
66from 0 (off) to 255 (full speed). Fan speed will be set to maximum when the
67temperature sensor associated with the PWM control exceeds temp#_max.
68
69Notes
70-----
71
72The NVIDIA binary driver presents an ADT7473 chip via an on-card i2c bus.
73Unfortunately, they fail to set the i2c adapter class, so this driver may
74fail to find the chip until the nvidia driver is patched.