1 ============================== 2 Linux I2C slave EEPROM backend 3 ============================== 4 5 by Wolfram Sang <wsa@sang-engineering.com> in 2014-20 6 7 This backend simulates an EEPROM on the connected I2C bus. Its memory contents 8 can be accessed from userspace via this file located in sysfs:: 9 10 /sys/bus/i2c/devices/<device-directory>/slave-eeprom 11 12 The following types are available: 24c02, 24c32, 24c64, and 24c512. Read-only 13 variants are also supported. The name needed for instantiating has the form 14 'slave-<type>[ro]'. Examples follow: 15 16 24c02, read/write, address 0x64: 17 # echo slave-24c02 0x1064 > /sys/bus/i2c/devices/i2c-1/new_device 18 19 24c512, read-only, address 0x42: 20 # echo slave-24c512ro 0x1042 > /sys/bus/i2c/devices/i2c-1/new_device 21 22 You can also preload data during boot if a device-property named 23 'firmware-name' contains a valid filename (DT or ACPI only). 24 25 As of 2015, Linux doesn't support poll on binary sysfs files, so there is no 26 notification when another master changed the content.
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