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-Kernel driver ds1621
-====================
-
-Supported chips:
-  * Dallas Semiconductor DS1621
-    Prefix: 'ds1621'
-    Addresses scanned: I2C 0x48 - 0x4f
-    Datasheet: Publicly available at the Dallas Semiconductor website
-               http://www.dalsemi.com/
-  * Dallas Semiconductor DS1625
-    Prefix: 'ds1621'
-    Addresses scanned: I2C 0x48 - 0x4f
-    Datasheet: Publicly available at the Dallas Semiconductor website
-               http://www.dalsemi.com/
-
-Authors:
-        Christian W. Zuckschwerdt <zany@triq.net>
-        valuable contributions by Jan M. Sendler <sendler@sendler.de>
-        ported to 2.6 by Aurelien Jarno <aurelien@aurel32.net>
-        with the help of Jean Delvare <khali@linux-fr.org>
-
-Module Parameters
-------------------
-
-* polarity int
-  Output's polarity: 0 = active high, 1 = active low
-
-Description
------------
-
-The DS1621 is a (one instance) digital thermometer and thermostat. It has
-both high and low temperature limits which can be user defined (i.e.
-programmed into non-volatile on-chip registers). Temperature range is -55
-degree Celsius to +125 in 0.5 increments. You may convert this into a
-Fahrenheit range of -67 to +257 degrees with 0.9 steps. If polarity
-parameter is not provided, original value is used.
-
-As for the thermostat, behavior can also be programmed using the polarity
-toggle. On the one hand ("heater"), the thermostat output of the chip,
-Tout, will trigger when the low limit temperature is met or underrun and
-stays high until the high limit is met or exceeded. On the other hand
-("cooler"), vice versa. That way "heater" equals "active low", whereas
-"conditioner" equals "active high". Please note that the DS1621 data sheet
-is somewhat misleading in this point since setting the polarity bit does
-not simply invert Tout.
-
-A second thing is that, during extensive testing, Tout showed a tolerance
-of up to +/- 0.5 degrees even when compared against precise temperature
-readings. Be sure to have a high vs. low temperature limit gap of al least
-1.0 degree Celsius to avoid Tout "bouncing", though!
-
-As for alarms, you can read the alarm status of the DS1621 via the 'alarms'
-/sys file interface. The result consists mainly of bit 6 and 5 of the
-configuration register of the chip; bit 6 (0x40 or 64) is the high alarm
-bit and bit 5 (0x20 or 32) the low one. These bits are set when the high or
-low limits are met or exceeded and are reset by the module as soon as the
-respective temperature ranges are left.
-
-The alarm registers are in no way suitable to find out about the actual
-status of Tout. They will only tell you about its history, whether or not
-any of the limits have ever been met or exceeded since last power-up or
-reset. Be aware: When testing, it showed that the status of Tout can change
-with neither of the alarms set.
-
-Temperature conversion of the DS1621 takes up to 1000ms; internal access to
-non-volatile registers may last for 10ms or below.
-
-High Accuracy Temperature Reading
----------------------------------
-
-As said before, the temperature issued via the 9-bit i2c-bus data is
-somewhat arbitrary. Internally, the temperature conversion is of a
-different kind that is explained (not so...) well in the DS1621 data sheet.
-To cut the long story short: Inside the DS1621 there are two oscillators,
-both of them biassed by a temperature coefficient.
-
-Higher resolution of the temperature reading can be achieved using the
-internal projection, which means taking account of REG_COUNT and REG_SLOPE
-(the driver manages them):
-
-Taken from Dallas Semiconductors App Note 068: 'Increasing Temperature
-Resolution on the DS1620' and App Note 105: 'High Resolution Temperature
-Measurement with Dallas Direct-to-Digital Temperature Sensors'
-
-- Read the 9-bit temperature and strip the LSB (Truncate the .5 degs)
-- The resulting value is TEMP_READ.
-- Then, read REG_COUNT.
-- And then, REG_SLOPE.
-
-      TEMP = TEMP_READ - 0.25 + ((REG_SLOPE - REG_COUNT) / REG_SLOPE)
-
-Note that this is what the DONE bit in the DS1621 configuration register is
-good for: Internally, one temperature conversion takes up to 1000ms. Before
-that conversion is complete you will not be able to read valid things out
-of REG_COUNT and REG_SLOPE. The DONE bit, as you may have guessed by now,
-tells you whether the conversion is complete ("done", in plain English) and
-thus, whether the values you read are good or not.
-
-The DS1621 has two modes of operation: "Continuous" conversion, which can
-be understood as the default stand-alone mode where the chip gets the
-temperature and controls external devices via its Tout pin or tells other
-i2c's about it if they care. The other mode is called "1SHOT", that means
-that it only figures out about the temperature when it is explicitly told
-to do so; this can be seen as power saving mode.
-
-Now if you want to read REG_COUNT and REG_SLOPE, you have to either stop
-the continuous conversions until the contents of these registers are valid,
-or, in 1SHOT mode, you have to have one conversion made.