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ccf988b6 | 1 | ============================== |
59d3d604 | 2 | Linux I2C slave EEPROM backend |
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3 | ============================== |
4 | ||
59d3d604 | 5 | by Wolfram Sang <wsa@sang-engineering.com> in 2014-20 |
d0c892f5 | 6 | |
59d3d604 WS |
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:: | |
d0c892f5 | 9 | |
2e049d61 | 10 | /sys/bus/i2c/devices/<device-directory>/slave-eeprom |
d0c892f5 | 11 | |
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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 | ||
d0c892f5 | 25 | As of 2015, Linux doesn't support poll on binary sysfs files, so there is no |
2e049d61 | 26 | notification when another master changed the content. |