Root/
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 | |
10 | Author: |
11 | Kaiwan N Billimoria <kaiwan@designergraphix.com> |
12 | |
13 | Description |
14 | ----------- |
15 | |
16 | This driver implements support for the National Semiconductor LM70 |
17 | temperature sensor. |
18 | |
19 | The LM70 temperature sensor chip supports a single temperature sensor. |
20 | It communicates with a host processor (or microcontroller) via an |
21 | SPI/Microwire Bus interface. |
22 | |
23 | Communication with the LM70 is simple: when the temperature is to be sensed, |
24 | the driver accesses the LM70 using SPI communication: 16 SCLK cycles |
25 | comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's |
26 | complement digital temperature (sent via the SIO line), is available in the |
27 | driver for interpretation. This driver makes use of the kernel's in-core |
28 | SPI support. |
29 | |
30 | As a real (in-tree) example of this "SPI protocol driver" interfacing |
31 | with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c |
32 | and its associated documentation. |
33 | |
34 | The TMP121/TMP123 are very similar; main differences are 4 wire SPI inter- |
35 | face (read only) and 13-bit temperature data (0.0625 degrees celsius reso- |
36 | lution). |
37 | |
38 | Thanks to |
39 | --------- |
40 | Jean Delvare <khali@linux-fr.org> for mentoring the hwmon-side driver |
41 | development. |
42 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9