diff options
author | Guenter Roeck <linux@roeck-us.net> | 2014-01-24 22:25:33 -0800 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2014-03-03 08:01:04 -0800 |
commit | b4c9c1a7987ef07d8345bf9d19f36d97423b6b25 (patch) | |
tree | 168998980521b3e9ea35de589bcc707b2fdcf8b7 /Documentation/hwmon/adc128d818 | |
parent | ebf5e87791a97a7b71d5bd52e0382321a56bb12b (diff) | |
download | linux-stable-b4c9c1a7987ef07d8345bf9d19f36d97423b6b25.tar.gz linux-stable-b4c9c1a7987ef07d8345bf9d19f36d97423b6b25.tar.bz2 linux-stable-b4c9c1a7987ef07d8345bf9d19f36d97423b6b25.zip |
hwmon: Driver for TI ADC128D818
ADC128D818 is a System Monitor with Temperature Sensor. It is similar to LM80
and LM96080, but has 16 bit wide sensor registers and no fan speed monitoring.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon/adc128d818')
-rw-r--r-- | Documentation/hwmon/adc128d818 | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/hwmon/adc128d818 b/Documentation/hwmon/adc128d818 new file mode 100644 index 000000000000..39c95004dabc --- /dev/null +++ b/Documentation/hwmon/adc128d818 @@ -0,0 +1,47 @@ +Kernel driver adc128d818 +======================== + +Supported chips: + * Texas Instruments ADC818D818 + Prefix: 'adc818d818' + Addresses scanned: I2C 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f + Datasheet: Publicly available at the TI website + http://www.ti.com/ + +Author: Guenter Roeck + +Description +----------- + +This driver implements support for the Texas Instruments ADC128D818. +It is described as 'ADC System Monitor with Temperature Sensor'. + +The ADC128D818 implements one temperature sensor and seven voltage sensors. + +Temperatures are measured in degrees Celsius. There is one set of limits. +When the HOT Temperature Limit is crossed, this will cause an alarm that will +be reasserted until the temperature drops below the HOT Hysteresis. +Measurements are guaranteed between -55 and +125 degrees. The temperature +measurement has a resolution of 0.5 degrees; the limits have a resolution +of 1 degree. + +Voltage sensors (also known as IN sensors) report their values in volts. +An alarm is triggered if the voltage has crossed a programmable minimum +or maximum limit. Note that minimum in this case always means 'closest to +zero'; this is important for negative voltage measurements. All voltage +inputs can measure voltages between 0 and 2.55 volts, with a resolution +of 0.625 mV. + +If an alarm triggers, it will remain triggered until the hardware register +is read at least once. This means that the cause for the alarm may +already have disappeared by the time the alarm is read. The driver +caches the alarm status for each sensor until it is at least reported +once, to ensure that alarms are reported to user space. + +The ADC128D818 only updates its values approximately once per second; +reading it more often will do no harm, but will return 'old' values. + +In addition to the scanned address list, the chip can also be configured for +addresses 0x35 to 0x37. Those addresses are not scanned. You have to instantiate +the driver explicitly if the chip is configured for any of those addresses in +your system. |