| 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. |
