Documentation/w1/slaves/w1_ds28e04

   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.