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- Kernel driver w1_ds28e04
- ========================
- Supported chips:
- * Maxim DS28E04-100 4096-Bit Addressable 1-Wire EEPROM with PIO
- supported family codes:
- W1_FAMILY_DS28E04 0x1C
- Author: Markus Franke, <franke.m@sebakmt.com> <franm@hrz.tu-chemnitz.de>
- Description
- -----------
- Support is provided through the sysfs files "eeprom" and "pio". CRC checking
- during memory accesses can optionally be enabled/disabled via the device
- attribute "crccheck". The strong pull-up can optionally be enabled/disabled
- via the module parameter "w1_strong_pullup".
- Memory Access
- A read operation on the "eeprom" file reads the given amount of bytes
- from the EEPROM of the DS28E04.
- A write operation on the "eeprom" file writes the given byte sequence
- to the EEPROM of the DS28E04. If CRC checking mode is enabled only
- fully aligned blocks of 32 bytes with valid CRC16 values (in bytes 30
- and 31) are allowed to be written.
- PIO Access
- The 2 PIOs of the DS28E04-100 are accessible via the "pio" sysfs file.
- The current status of the PIO's is returned as an 8 bit value. Bit 0/1
- represent the state of PIO_0/PIO_1. Bits 2..7 do not care. The PIO's are
- driven low-active, i.e. the driver delivers/expects low-active values.
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