Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver w1_ds28e04 2 ======================== 3 4 Supported chips: 5 * Maxim DS28E04-100 4096-Bit Addressable 1-Wire EEPROM with PIO 6 7 supported family codes: 8 W1_FAMILY_DS28E04 0x1C 9 10 Author: Markus Franke, <franke.m@sebakmt.com> <franm@hrz.tu-chemnitz.de> 11 12 Description 13 ----------- 14 15 Support is provided through the sysfs files "eeprom" and "pio". CRC checking 16 during memory accesses can optionally be enabled/disabled via the device 17 attribute "crccheck". The strong pull-up can optionally be enabled/disabled 18 via the module parameter "w1_strong_pullup". 19 20 Memory Access 21 22 A read operation on the "eeprom" file reads the given amount of bytes 23 from the EEPROM of the DS28E04. 24 25 A write operation on the "eeprom" file writes the given byte sequence 26 to the EEPROM of the DS28E04. If CRC checking mode is enabled only 27 fully aligned blocks of 32 bytes with valid CRC16 values (in bytes 30 28 and 31) are allowed to be written. 29 30 PIO Access 31 32 The 2 PIOs of the DS28E04-100 are accessible via the "pio" sysfs file. 33 34 The current status of the PIO's is returned as an 8 bit value. Bit 0/1 35 represent the state of PIO_0/PIO_1. Bits 2..7 do not care. The PIO's are 36 driven low-active, i.e. the driver delivers/expects low-active values.