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- Kernel driver lm70
- ==================
- Supported chips:
- * National Semiconductor LM70
- Datasheet: https://www.ti.com/product/LM70
- * Texas Instruments TMP121/TMP123
- Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html
- * Texas Instruments TMP122/TMP124
- Information: https://www.ti.com/product/tmp122
- * Texas Instruments TMP125
- Information: https://www.ti.com/product/tmp125
- * National Semiconductor LM71
- Datasheet: https://www.ti.com/product/LM71
- * National Semiconductor LM74
- Datasheet: https://www.ti.com/product/LM74
- Author:
- Kaiwan N Billimoria <kaiwan@designergraphix.com>
- Description
- -----------
- This driver implements support for the National Semiconductor LM70
- temperature sensor.
- The LM70 temperature sensor chip supports a single temperature sensor.
- It communicates with a host processor (or microcontroller) via an
- SPI/Microwire Bus interface.
- Communication with the LM70 is simple: when the temperature is to be sensed,
- the driver accesses the LM70 using SPI communication: 16 SCLK cycles
- comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
- complement digital temperature (sent via the SIO line), is available in the
- driver for interpretation. This driver makes use of the kernel's in-core
- SPI support.
- As a real (in-tree) example of this "SPI protocol driver" interfacing
- with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
- and its associated documentation.
- The LM74 and TMP121/TMP122/TMP123/TMP124 are very similar; main difference is
- 13-bit temperature data (0.0625 degrees celsius resolution).
- The TMP122/TMP124 also feature configurable temperature thresholds.
- The TMP125 is less accurate and provides 10-bit temperature data
- with 0.25 degrees Celsius resolution.
- The LM71 is also very similar; main difference is 14-bit temperature
- data (0.03125 degrees celsius resolution).
- Thanks to
- ---------
- Jean Delvare <jdelvare@suse.de> for mentoring the hwmon-side driver
- development.
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