1.. SPDX-License-Identifier: GPL-2.0-or-later 2 3Kernel driver max127 4==================== 5 6Author: 7 8 * Tao Ren <rentao.bupt@gmail.com> 9 10Supported chips: 11 12 * Maxim MAX127 13 14 Prefix: 'max127' 15 16 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max127-max128.pdf 17 18Description 19----------- 20 21The MAX127 is a multirange, 12-bit data acquisition system (DAS) providing 228 analog input channels that are independently software programmable for 23a variety of ranges. The available ranges are {0,5V}, {0,10V}, {-5,5V} 24and {-10,10V}. 25 26The MAX127 features a 2-wire, I2C-compatible serial interface that allows 27communication among multiple devices using SDA and SCL lines. 28 29Sysfs interface 30--------------- 31 32 ============== ============================================================== 33 in[0-7]_input The input voltage (in mV) of the corresponding channel. 34 RO 35 36 in[0-7]_min The lower input limit (in mV) for the corresponding channel. 37 ADC range and LSB will be updated when the limit is changed. 38 For the MAX127, it will be adjusted to -10000, -5000, or 0. 39 RW 40 41 in[0-7]_max The higher input limit (in mV) for the corresponding channel. 42 ADC range and LSB will be updated when the limit is changed. 43 For the MAX127, it will be adjusted to 0, 5000, or 10000. 44 RW 45 ============== ============================================================== 46