projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e1a8e913 KB |
1 | Kernel driver lm70 |
| 2 | ================== | |
| 3 | ||
| 4 | Supported chip: | |
| 5 | * National Semiconductor LM70 | |
| 6 | Datasheet: http://www.national.com/pf/LM/LM70.html | |
| 7 | ||
| 8 | Author: | |
| 9 | Kaiwan N Billimoria <kaiwan@designergraphix.com> | |
| 10 | ||
| 11 | Description | |
| 12 | ----------- | |
| 13 | ||
| 14 | This driver implements support for the National Semiconductor LM70 | |
| 15 | temperature sensor. | |
| 16 | ||
| 17 | The LM70 temperature sensor chip supports a single temperature sensor. | |
| 18 | It communicates with a host processor (or microcontroller) via an | |
| 19 | SPI/Microwire Bus interface. | |
| 20 | ||
| 21 | Communication with the LM70 is simple: when the temperature is to be sensed, | |
| 22 | the driver accesses the LM70 using SPI communication: 16 SCLK cycles | |
| 23 | comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's | |
| 24 | complement digital temperature (sent via the SIO line), is available in the | |
| 25 | driver for interpretation. This driver makes use of the kernel's in-core | |
| 26 | SPI support. | |
| 27 | ||
| 28 | Thanks to | |
| 29 | --------- | |
| 30 | Jean Delvare <khali@linux-fr.org> for mentoring the hwmon-side driver | |
| 31 | development. |