Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Maxim MAX197 driver 2 =================== 3 4 Author: 5 * Vivien Didelot <vivien.didelot@savoirfairelinux.com> 6 7 Supported chips: 8 * Maxim MAX197 9 Prefix: 'max197' 10 Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX197.pdf 11 12 * Maxim MAX199 13 Prefix: 'max199' 14 Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX199.pdf 15 16 Description 17 ----------- 18 19 The A/D converters MAX197, and MAX199 are both 8-Channel, Multi-Range, 5V, 20 12-Bit DAS with 8+4 Bus Interface and Fault Protection. 21 22 The available ranges for the MAX197 are {0,-5V} to 5V, and {0,-10V} to 10V, 23 while they are {0,-2V} to 2V, and {0,-4V} to 4V on the MAX199. 24 25 Platform data 26 ------------- 27 28 The MAX197 platform data (defined in linux/platform_data/max197.h) should be 29 filled with a pointer to a conversion function, defined like: 30 31 int convert(u8 ctrl); 32 33 ctrl is the control byte to write to start a new conversion. 34 On success, the function must return the 12-bit raw value read from the chip, 35 or a negative error code otherwise. 36 37 Control byte format: 38 39 Bit Name Description 40 7,6 PD1,PD0 Clock and Power-Down modes 41 5 ACQMOD Internal or External Controlled Acquisition 42 4 RNG Full-scale voltage magnitude at the input 43 3 BIP Unipolar or Bipolar conversion mode 44 2,1,0 A2,A1,A0 Channel 45 46 Sysfs interface 47 --------------- 48 49 * in[0-7]_input: The conversion value for the corresponding channel. 50 RO 51 52 * in[0-7]_min: The lower limit (in mV) for the corresponding channel. 53 For the MAX197, it will be adjusted to -10000, -5000, or 0. 54 For the MAX199, it will be adjusted to -4000, -2000, or 0. 55 RW 56 57 * in[0-7]_max: The higher limit (in mV) for the corresponding channel. 58 For the MAX197, it will be adjusted to 0, 5000, or 10000. 59 For the MAX199, it will be adjusted to 0, 2000, or 4000. 60 RW