8c22a8f575
Signed-off-by: Dirk Eibach <eibach@gdsys.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
67 lines
1.7 KiB
Text
67 lines
1.7 KiB
Text
Kernel driver ads1015
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=====================
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Supported chips:
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* Texas Instruments ADS1015
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Prefix: 'ads1015'
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Datasheet: Publicly available at the Texas Instruments website :
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http://focus.ti.com/lit/ds/symlink/ads1015.pdf
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Authors:
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Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de>
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Description
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-----------
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This driver implements support for the Texas Instruments ADS1015.
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This device is a 12-bit A-D converter with 4 inputs.
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The inputs can be used single ended or in certain differential combinations.
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The inputs can be exported to 8 sysfs input files in0_input - in7_input:
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in0: Voltage over AIN0 and AIN1.
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in1: Voltage over AIN0 and AIN3.
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in2: Voltage over AIN1 and AIN3.
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in3: Voltage over AIN2 and AIN3.
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in4: Voltage over AIN0 and GND.
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in5: Voltage over AIN1 and GND.
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in6: Voltage over AIN2 and GND.
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in7: Voltage over AIN3 and GND.
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Which inputs are exported can be configured using platform data or devicetree.
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By default all inputs are exported.
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Platform Data
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-------------
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In linux/i2c/ads1015.h platform data is defined as:
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struct ads1015_platform_data {
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unsigned int exported_channels;
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};
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exported_channels is a bitmask that specifies which inputs should be exported.
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Example:
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struct ads1015_platform_data data = {
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.exported_channels = (1 << 2) | (1 << 4)
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};
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In this case only in2_input and in4_input would be created.
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Devicetree
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----------
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The ads1015 node may have an "exported-channels" property.
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exported_channels is a bitmask that specifies which inputs should be exported.
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Example:
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ads1015@49 {
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compatible = "ti,ads1015";
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reg = <0x49>;
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exported-channels = < 0x14 >;
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};
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In this case only in2_input and in4_input would be created.
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