9010624cc5
include/linux/i2c is not for client devices. Move the header file to a more appropriate location. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2.0 KiB
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/platform_data/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