From 7ebd8b66dd9e5a0b65e5ee5e2b8e7ca382ec97b7 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 17 Apr 2019 06:46:29 -0300 Subject: docs: hwmon: Add an index file and rename docs to *.rst Now that all files were converted to ReST format, rename them and add an index. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Guenter Roeck --- Documentation/hwmon/lm70.rst | 62 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 Documentation/hwmon/lm70.rst (limited to 'Documentation/hwmon/lm70.rst') diff --git a/Documentation/hwmon/lm70.rst b/Documentation/hwmon/lm70.rst new file mode 100644 index 000000000000..f259bc1fcd91 --- /dev/null +++ b/Documentation/hwmon/lm70.rst @@ -0,0 +1,62 @@ +Kernel driver lm70 +================== + +Supported chips: + + * National Semiconductor LM70 + + Datasheet: http://www.national.com/pf/LM/LM70.html + + * Texas Instruments TMP121/TMP123 + + Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html + + * Texas Instruments TMP122/TMP124 + + Information: http://www.ti.com/product/tmp122 + + * National Semiconductor LM71 + + Datasheet: http://www.ti.com/product/LM71 + + * National Semiconductor LM74 + + Datasheet: http://www.ti.com/product/LM74 + + +Author: + Kaiwan N Billimoria + +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 LM71 is also very similar; main difference is 14-bit temperature +data (0.03125 degrees celsius resolution). + +Thanks to +--------- +Jean Delvare for mentoring the hwmon-side driver +development. -- cgit v1.2.3-59-g8ed1b