Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver ads1015 2 ===================== 3 4 Supported chips: 5 * Texas Instruments ADS1015 6 Prefix: 'ads1015' 7 Datasheet: Publicly available at the Texas Instruments website : 8 http://focus.ti.com/lit/ds/symlink/ads1015.pdf 9 * Texas Instruments ADS1115 10 Prefix: 'ads1115' 11 Datasheet: Publicly available at the Texas Instruments website : 12 http://focus.ti.com/lit/ds/symlink/ads1115.pdf 13 14 Authors: 15 Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de> 16 17 Description 18 ----------- 19 20 This driver implements support for the Texas Instruments ADS1015/ADS1115. 21 22 This device is a 12/16-bit A-D converter with 4 inputs. 23 24 The inputs can be used single ended or in certain differential combinations. 25 26 The inputs can be made available by 8 sysfs input files in0_input - in7_input: 27 in0: Voltage over AIN0 and AIN1. 28 in1: Voltage over AIN0 and AIN3. 29 in2: Voltage over AIN1 and AIN3. 30 in3: Voltage over AIN2 and AIN3. 31 in4: Voltage over AIN0 and GND. 32 in5: Voltage over AIN1 and GND. 33 in6: Voltage over AIN2 and GND. 34 in7: Voltage over AIN3 and GND. 35 36 Which inputs are available can be configured using platform data or devicetree. 37 38 By default all inputs are exported. 39 40 Platform Data 41 ------------- 42 43 In linux/platform_data/ads1015.h platform data is defined, channel_data contains 44 configuration data for the used input combinations: 45 - pga is the programmable gain amplifier (values are full scale) 46 0: +/- 6.144 V 47 1: +/- 4.096 V 48 2: +/- 2.048 V 49 3: +/- 1.024 V 50 4: +/- 0.512 V 51 5: +/- 0.256 V 52 - data_rate in samples per second 53 0: 128 54 1: 250 55 2: 490 56 3: 920 57 4: 1600 58 5: 2400 59 6: 3300 60 61 Example: 62 struct ads1015_platform_data data = { 63 .channel_data = { 64 [2] = { .enabled = true, .pga = 1, .data_rate = 0 }, 65 [4] = { .enabled = true, .pga = 4, .data_rate = 5 }, 66 } 67 }; 68 69 In this case only in2_input (FS +/- 4.096 V, 128 SPS) and in4_input 70 (FS +/- 0.512 V, 2400 SPS) would be created. 71 72 Devicetree 73 ---------- 74 75 Configuration is also possible via devicetree: 76 Documentation/devicetree/bindings/hwmon/ads1015.txt