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| author | Dirk Eibach <eibach@gdsys.de> | 2011-03-21 17:59:36 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2011-03-21 17:59:36 +0100 |
| commit | 8c22a8f57516275afcd81c84f3724ac08cf6aa7b (patch) | |
| tree | 9b3e0770466cf7edcb2d48f483cae79fa82bdfce /Documentation/hwmon/ads1015 | |
| parent | a98d506c08ffe754fa013c7f70c4d578b991fb4b (diff) | |
| download | linux-8c22a8f57516275afcd81c84f3724ac08cf6aa7b.tar.bz2 | |
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/ads1015')
| -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 000000000000..56ee7977b1a8 --- /dev/null +++ b/Documentation/hwmon/ads1015 @@ -0,0 +1,67 @@ +Kernel driver ads1015 +===================== + +Supported chips: + * Texas Instruments ADS1015 + Prefix: 'ads1015' + Datasheet: Publicly available at the Texas Instruments website : + http://focus.ti.com/lit/ds/symlink/ads1015.pdf + +Authors: + Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de> + +Description +----------- + +This driver implements support for the Texas Instruments ADS1015. + +This device is a 12-bit A-D converter with 4 inputs. + +The inputs can be used single ended or in certain differential combinations. + +The inputs can be exported to 8 sysfs input files in0_input - in7_input: +in0: Voltage over AIN0 and AIN1. +in1: Voltage over AIN0 and AIN3. +in2: Voltage over AIN1 and AIN3. +in3: Voltage over AIN2 and AIN3. +in4: Voltage over AIN0 and GND. +in5: Voltage over AIN1 and GND. +in6: Voltage over AIN2 and GND. +in7: Voltage over AIN3 and GND. + +Which inputs are exported can be configured using platform data or devicetree. + +By default all inputs are exported. + +Platform Data +------------- + +In linux/i2c/ads1015.h platform data is defined as: + +struct ads1015_platform_data { + unsigned int exported_channels; +}; + +exported_channels is a bitmask that specifies which inputs should be exported. + +Example: +struct ads1015_platform_data data = { + .exported_channels = (1 << 2) | (1 << 4) +}; + +In this case only in2_input and in4_input would be created. + +Devicetree +---------- + +The ads1015 node may have an "exported-channels" property. +exported_channels is a bitmask that specifies which inputs should be exported. + +Example: +ads1015@49 { + compatible = "ti,ads1015"; + reg = <0x49>; + exported-channels = < 0x14 >; +}; + +In this case only in2_input and in4_input would be created. |