Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver lm70 2 ================== 3 4 Supported chips: 5 * National Semiconductor LM70 6 Datasheet: http://www.national.com/pf/LM/LM70.html 7 * Texas Instruments TMP121/TMP123 8 Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html 9 * Texas Instruments TMP122/TMP124 10 Information: http://www.ti.com/product/tmp122 11 * National Semiconductor LM71 12 Datasheet: http://www.ti.com/product/LM71 13 * National Semiconductor LM74 14 Datasheet: http://www.ti.com/product/LM74 15 16 Author: 17 Kaiwan N Billimoria <kaiwan@designergraphix.com> 18 19 Description 20 ----------- 21 22 This driver implements support for the National Semiconductor LM70 23 temperature sensor. 24 25 The LM70 temperature sensor chip supports a single temperature sensor. 26 It communicates with a host processor (or microcontroller) via an 27 SPI/Microwire Bus interface. 28 29 Communication with the LM70 is simple: when the temperature is to be sensed, 30 the driver accesses the LM70 using SPI communication: 16 SCLK cycles 31 comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's 32 complement digital temperature (sent via the SIO line), is available in the 33 driver for interpretation. This driver makes use of the kernel's in-core 34 SPI support. 35 36 As a real (in-tree) example of this "SPI protocol driver" interfacing 37 with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c 38 and its associated documentation. 39 40 The LM74 and TMP121/TMP122/TMP123/TMP124 are very similar; main difference is 41 13-bit temperature data (0.0625 degrees celsius resolution). 42 43 The TMP122/TMP124 also feature configurable temperature thresholds. 44 45 The LM71 is also very similar; main difference is 14-bit temperature 46 data (0.03125 degrees celsius resolution). 47 48 Thanks to 49 --------- 50 Jean Delvare <jdelvare@suse.de> for mentoring the hwmon-side driver 51 development.