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authorDirk Eibach <eibach@gdsys.de>2011-03-21 12:59:36 -0400
committerJean Delvare <khali@endymion.delvare>2011-03-21 12:59:36 -0400
commit8c22a8f57516275afcd81c84f3724ac08cf6aa7b (patch)
tree9b3e0770466cf7edcb2d48f483cae79fa82bdfce /Documentation/hwmon
parenta98d506c08ffe754fa013c7f70c4d578b991fb4b (diff)
hwmon: Add support for Texas Instruments ADS1015
Signed-off-by: Dirk Eibach <eibach@gdsys.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
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1Kernel driver ads1015
2=====================
3
4Supported chips:
5 * Texas Instruments ADS1015
6 Prefix: 'ads1015'
7 Datasheet: Publicly available at the Texas Instruments website :
8 http://focus.ti.com/lit/ds/symlink/ads1015.pdf
9
10Authors:
11 Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de>
12
13Description
14-----------
15
16This driver implements support for the Texas Instruments ADS1015.
17
18This device is a 12-bit A-D converter with 4 inputs.
19
20The inputs can be used single ended or in certain differential combinations.
21
22The inputs can be exported to 8 sysfs input files in0_input - in7_input:
23in0: Voltage over AIN0 and AIN1.
24in1: Voltage over AIN0 and AIN3.
25in2: Voltage over AIN1 and AIN3.
26in3: Voltage over AIN2 and AIN3.
27in4: Voltage over AIN0 and GND.
28in5: Voltage over AIN1 and GND.
29in6: Voltage over AIN2 and GND.
30in7: Voltage over AIN3 and GND.
31
32Which inputs are exported can be configured using platform data or devicetree.
33
34By default all inputs are exported.
35
36Platform Data
37-------------
38
39In linux/i2c/ads1015.h platform data is defined as:
40
41struct ads1015_platform_data {
42 unsigned int exported_channels;
43};
44
45exported_channels is a bitmask that specifies which inputs should be exported.
46
47Example:
48struct ads1015_platform_data data = {
49 .exported_channels = (1 << 2) | (1 << 4)
50};
51
52In this case only in2_input and in4_input would be created.
53
54Devicetree
55----------
56
57The ads1015 node may have an "exported-channels" property.
58exported_channels is a bitmask that specifies which inputs should be exported.
59
60Example:
61ads1015@49 {
62 compatible = "ti,ads1015";
63 reg = <0x49>;
64 exported-channels = < 0x14 >;
65};
66
67In this case only in2_input and in4_input would be created.