diff options
Diffstat (limited to 'Documentation/hwmon/lm63')
| -rw-r--r-- | Documentation/hwmon/lm63 | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/Documentation/hwmon/lm63 b/Documentation/hwmon/lm63 index b9843eab1af..4a00461512a 100644 --- a/Documentation/hwmon/lm63 +++ b/Documentation/hwmon/lm63 @@ -12,8 +12,13 @@ Supported chips: Addresses scanned: I2C 0x18 and 0x4e Datasheet: Publicly available at the National Semiconductor website http://www.national.com/pf/LM/LM64.html + * National Semiconductor LM96163 + Prefix: 'lm96163' + Addresses scanned: I2C 0x4c + Datasheet: Publicly available at the National Semiconductor website + http://www.national.com/pf/LM/LM96163.html -Author: Jean Delvare <khali@linux-fr.org> +Author: Jean Delvare <jdelvare@suse.de> Thanks go to Tyan and especially Alex Buckingham for setting up a remote access to their S4882 test platform for this driver. @@ -49,16 +54,24 @@ value for measuring the speed of the fan. It can measure fan speeds down to Note that the pin used for fan monitoring is shared with an alert out function. Depending on how the board designer wanted to use the chip, fan speed monitoring will or will not be possible. The proper chip configuration -is left to the BIOS, and the driver will blindly trust it. +is left to the BIOS, and the driver will blindly trust it. Only the original +LM63 suffers from this limitation, the LM64 and LM96163 have separate pins +for fan monitoring and alert out. On the LM64, monitoring is always enabled; +on the LM96163 it can be disabled. A PWM output can be used to control the speed of the fan. The LM63 has two PWM modes: manual and automatic. Automatic mode is not fully implemented yet (you cannot define your custom PWM/temperature curve), and mode change isn't supported either. -The lm63 driver will not update its values more frequently than every -second; reading them more often will do no harm, but will return 'old' -values. +The lm63 driver will not update its values more frequently than configured with +the update_interval sysfs attribute; reading them more often will do no harm, +but will return 'old' values. Values in the automatic fan control lookup table +(attributes pwm1_auto_*) have their own independent lifetime of 5 seconds. The LM64 is effectively an LM63 with GPIO lines. The driver does not support these GPIO lines at present. + +The LM96163 is an enhanced version of LM63 with improved temperature accuracy +and better PWM resolution. For LM96163, the external temperature sensor type is +configurable as CPU embedded diode(1) or 3904 transistor(2). |