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-Kernel driver lm77
-==================
-
-Supported chips:
- * National Semiconductor LM77
- Prefix: 'lm77'
- Addresses scanned: I2C 0x48 - 0x4b
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/
-
-Author: Andras BALI <drewie@freemail.hu>
-
-Description
------------
-
-The LM77 implements one temperature sensor. The temperature
-sensor incorporates a band-gap type temperature sensor,
-10-bit ADC, and a digital comparator with user-programmable upper
-and lower limit values.
-
-The LM77 implements 3 limits: low (temp1_min), high (temp1_max) and
-critical (temp1_crit.) It also implements an hysteresis mechanism which
-applies to all 3 limits. The relative difference is stored in a single
-register on the chip, which means that the relative difference between
-the limit and its hysteresis is always the same for all 3 limits.
-
-This implementation detail implies the following:
-* When setting a limit, its hysteresis will automatically follow, the
- difference staying unchanged. For example, if the old critical limit
- was 80 degrees C, and the hysteresis was 75 degrees C, and you change
- the critical limit to 90 degrees C, then the hysteresis will
- automatically change to 85 degrees C.
-* All 3 hysteresis can't be set independently. We decided to make
- temp1_crit_hyst writable, while temp1_min_hyst and temp1_max_hyst are
- read-only. Setting temp1_crit_hyst writes the difference between
- temp1_crit_hyst and temp1_crit into the chip, and the same relative
- hysteresis applies automatically to the low and high limits.
-* The limits should be set before the hysteresis.