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- 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
- * Texas Instruments ADS1115
- Prefix: 'ads1115'
- Datasheet: Publicly available at the Texas Instruments website :
- http://focus.ti.com/lit/ds/symlink/ads1115.pdf
- Authors:
- Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de>
- Description
- -----------
- This driver implements support for the Texas Instruments ADS1015/ADS1115.
- This device is a 12/16-bit A-D converter with 4 inputs.
- The inputs can be used single ended or in certain differential combinations.
- The inputs can be made available by 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 available 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, channel_data contains
- configuration data for the used input combinations:
- - pga is the programmable gain amplifier (values are full scale)
- 0: +/- 6.144 V
- 1: +/- 4.096 V
- 2: +/- 2.048 V
- 3: +/- 1.024 V
- 4: +/- 0.512 V
- 5: +/- 0.256 V
- - data_rate in samples per second
- 0: 128
- 1: 250
- 2: 490
- 3: 920
- 4: 1600
- 5: 2400
- 6: 3300
- Example:
- struct ads1015_platform_data data = {
- .channel_data = {
- [2] = { .enabled = true, .pga = 1, .data_rate = 0 },
- [4] = { .enabled = true, .pga = 4, .data_rate = 5 },
- }
- };
- In this case only in2_input (FS +/- 4.096 V, 128 SPS) and in4_input
- (FS +/- 0.512 V, 2400 SPS) would be created.
- Devicetree
- ----------
- Configuration is also possible via devicetree:
- Documentation/devicetree/bindings/hwmon/ads1015.txt
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