diff options
author | Dirk Eibach <eibach@gdsys.de> | 2011-03-21 12:59:36 -0400 |
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committer | Jean Delvare <khali@endymion.delvare> | 2011-03-21 12:59:36 -0400 |
commit | 8c22a8f57516275afcd81c84f3724ac08cf6aa7b (patch) | |
tree | 9b3e0770466cf7edcb2d48f483cae79fa82bdfce /Documentation/hwmon | |
parent | a98d506c08ffe754fa013c7f70c4d578b991fb4b (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>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r-- | Documentation/hwmon/ads1015 | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/Documentation/hwmon/ads1015 b/Documentation/hwmon/ads1015 new file mode 100644 index 00000000000..56ee7977b1a --- /dev/null +++ b/Documentation/hwmon/ads1015 | |||
@@ -0,0 +1,67 @@ | |||
1 | Kernel driver ads1015 | ||
2 | ===================== | ||
3 | |||
4 | Supported 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 | |||
10 | Authors: | ||
11 | Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de> | ||
12 | |||
13 | Description | ||
14 | ----------- | ||
15 | |||
16 | This driver implements support for the Texas Instruments ADS1015. | ||
17 | |||
18 | This device is a 12-bit A-D converter with 4 inputs. | ||
19 | |||
20 | The inputs can be used single ended or in certain differential combinations. | ||
21 | |||
22 | The inputs can be exported to 8 sysfs input files in0_input - in7_input: | ||
23 | in0: Voltage over AIN0 and AIN1. | ||
24 | in1: Voltage over AIN0 and AIN3. | ||
25 | in2: Voltage over AIN1 and AIN3. | ||
26 | in3: Voltage over AIN2 and AIN3. | ||
27 | in4: Voltage over AIN0 and GND. | ||
28 | in5: Voltage over AIN1 and GND. | ||
29 | in6: Voltage over AIN2 and GND. | ||
30 | in7: Voltage over AIN3 and GND. | ||
31 | |||
32 | Which inputs are exported can be configured using platform data or devicetree. | ||
33 | |||
34 | By default all inputs are exported. | ||
35 | |||
36 | Platform Data | ||
37 | ------------- | ||
38 | |||
39 | In linux/i2c/ads1015.h platform data is defined as: | ||
40 | |||
41 | struct ads1015_platform_data { | ||
42 | unsigned int exported_channels; | ||
43 | }; | ||
44 | |||
45 | exported_channels is a bitmask that specifies which inputs should be exported. | ||
46 | |||
47 | Example: | ||
48 | struct ads1015_platform_data data = { | ||
49 | .exported_channels = (1 << 2) | (1 << 4) | ||
50 | }; | ||
51 | |||
52 | In this case only in2_input and in4_input would be created. | ||
53 | |||
54 | Devicetree | ||
55 | ---------- | ||
56 | |||
57 | The ads1015 node may have an "exported-channels" property. | ||
58 | exported_channels is a bitmask that specifies which inputs should be exported. | ||
59 | |||
60 | Example: | ||
61 | ads1015@49 { | ||
62 | compatible = "ti,ads1015"; | ||
63 | reg = <0x49>; | ||
64 | exported-channels = < 0x14 >; | ||
65 | }; | ||
66 | |||
67 | In this case only in2_input and in4_input would be created. | ||