diff options
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/hwmon/adt7473 | 79 | ||||
-rw-r--r-- | Documentation/hwmon/coretemp | 6 |
2 files changed, 83 insertions, 2 deletions
diff --git a/Documentation/hwmon/adt7473 b/Documentation/hwmon/adt7473 new file mode 100644 index 000000000000..22d8b19046ab --- /dev/null +++ b/Documentation/hwmon/adt7473 | |||
@@ -0,0 +1,79 @@ | |||
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 | Description | ||
13 | ----------- | ||
14 | |||
15 | This driver implements support for the Analog Devices ADT7473 chip family. | ||
16 | |||
17 | The LM85 uses the 2-wire interface compatible with the SMBUS 2.0 | ||
18 | specification. Using an analog to digital converter it measures three (3) | ||
19 | temperatures and two (2) voltages. It has three (3) 16-bit counters for | ||
20 | measuring fan speed. There are three (3) PWM outputs that can be used | ||
21 | to control fan speed. | ||
22 | |||
23 | A sophisticated control system for the PWM outputs is designed into the | ||
24 | LM85 that allows fan speed to be adjusted automatically based on any of the | ||
25 | three temperature sensors. Each PWM output is individually adjustable and | ||
26 | programmable. Once configured, the ADT7473 will adjust the PWM outputs in | ||
27 | response to the measured temperatures without further host intervention. | ||
28 | This feature can also be disabled for manual control of the PWM's. | ||
29 | |||
30 | Each of the measured inputs (voltage, temperature, fan speed) has | ||
31 | corresponding high/low limit values. The ADT7473 will signal an ALARM if | ||
32 | any measured value exceeds either limit. | ||
33 | |||
34 | The ADT7473 samples all inputs continuously. The driver will not read | ||
35 | the registers more often than once every other second. Further, | ||
36 | configuration data is only read once per minute. | ||
37 | |||
38 | Special Features | ||
39 | ---------------- | ||
40 | |||
41 | The ADT7473 have a 10-bit ADC and can therefore measure temperatures | ||
42 | with 0.25 degC resolution. Temperature readings can be configured either | ||
43 | for twos complement format or "Offset 64" format, wherein 63 is subtracted | ||
44 | from the raw value to get the temperature value. | ||
45 | |||
46 | The Analog Devices datasheet is very detailed and describes a procedure for | ||
47 | determining an optimal configuration for the automatic PWM control. | ||
48 | |||
49 | Hardware Configurations | ||
50 | ----------------------- | ||
51 | |||
52 | The ADT7473 chips have an optional SMBALERT output that can be used to | ||
53 | signal the chipset in case a limit is exceeded or the temperature sensors | ||
54 | fail. Individual sensor interrupts can be masked so they won't trigger | ||
55 | SMBALERT. The SMBALERT output if configured replaces the PWM2 function. | ||
56 | |||
57 | Configuration Notes | ||
58 | ------------------- | ||
59 | |||
60 | Besides standard interfaces driver adds the following: | ||
61 | |||
62 | * PWM Control | ||
63 | |||
64 | * pwm#_auto_point1_pwm and pwm#_auto_point1_temp and | ||
65 | * pwm#_auto_point2_pwm and pwm#_auto_point2_temp - | ||
66 | |||
67 | point1: Set the pwm speed at a lower temperature bound. | ||
68 | point2: Set the pwm speed at a higher temperature bound. | ||
69 | |||
70 | The ADT7473 will scale the pwm between the lower and higher pwm speed when | ||
71 | the temperature is between the two temperature boundaries. PWM values range | ||
72 | from 0 (off) to 255 (full speed). | ||
73 | |||
74 | Notes | ||
75 | ----- | ||
76 | |||
77 | The NVIDIA binary driver presents an ADT7473 chip via an on-card i2c bus. | ||
78 | Unfortunately, they fail to set the i2c adapter class, so this driver may | ||
79 | fail to find the chip until the nvidia driver is patched. | ||
diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp index 170bf862437b..dbbe6c7025b0 100644 --- a/Documentation/hwmon/coretemp +++ b/Documentation/hwmon/coretemp | |||
@@ -4,9 +4,10 @@ Kernel driver coretemp | |||
4 | Supported chips: | 4 | Supported chips: |
5 | * All Intel Core family | 5 | * All Intel Core family |
6 | Prefix: 'coretemp' | 6 | Prefix: 'coretemp' |
7 | CPUID: family 0x6, models 0xe, 0xf, 0x16 | 7 | CPUID: family 0x6, models 0xe, 0xf, 0x16, 0x17 |
8 | Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual | 8 | Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual |
9 | Volume 3A: System Programming Guide | 9 | Volume 3A: System Programming Guide |
10 | http://softwarecommunity.intel.com/Wiki/Mobility/720.htm | ||
10 | 11 | ||
11 | Author: Rudolf Marek | 12 | Author: Rudolf Marek |
12 | 13 | ||
@@ -25,7 +26,8 @@ may be raised, if the temperature grows enough (more than TjMax) to trigger | |||
25 | the Out-Of-Spec bit. Following table summarizes the exported sysfs files: | 26 | the Out-Of-Spec bit. Following table summarizes the exported sysfs files: |
26 | 27 | ||
27 | temp1_input - Core temperature (in millidegrees Celsius). | 28 | temp1_input - Core temperature (in millidegrees Celsius). |
28 | temp1_crit - Maximum junction temperature (in millidegrees Celsius). | 29 | temp1_max - All cooling devices should be turned on (on Core2). |
30 | temp1_crit - Maximum junction temperature (in millidegrees Celsius). | ||
29 | temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. | 31 | temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. |
30 | Correct CPU operation is no longer guaranteed. | 32 | Correct CPU operation is no longer guaranteed. |
31 | temp1_label - Contains string "Core X", where X is processor | 33 | temp1_label - Contains string "Core X", where X is processor |