1 ============================== 1 ==============================
2 Linux I2C slave EEPROM backend 2 Linux I2C slave EEPROM backend
3 ============================== 3 ==============================
4 4
5 by Wolfram Sang <wsa@sang-engineering.com> in 2 5 by Wolfram Sang <wsa@sang-engineering.com> in 2014-20
6 6
7 This backend simulates an EEPROM on the connec 7 This backend simulates an EEPROM on the connected I2C bus. Its memory contents
8 can be accessed from userspace via this file l 8 can be accessed from userspace via this file located in sysfs::
9 9
10 /sys/bus/i2c/devices/<device-directory 10 /sys/bus/i2c/devices/<device-directory>/slave-eeprom
11 11
12 The following types are available: 24c02, 24c3 12 The following types are available: 24c02, 24c32, 24c64, and 24c512. Read-only
13 variants are also supported. The name needed f 13 variants are also supported. The name needed for instantiating has the form
14 'slave-<type>[ro]'. Examples follow: 14 'slave-<type>[ro]'. Examples follow:
15 15
16 24c02, read/write, address 0x64: 16 24c02, read/write, address 0x64:
17 # echo slave-24c02 0x1064 > /sys/bus/i2c/dev 17 # echo slave-24c02 0x1064 > /sys/bus/i2c/devices/i2c-1/new_device
18 18
19 24c512, read-only, address 0x42: 19 24c512, read-only, address 0x42:
20 # echo slave-24c512ro 0x1042 > /sys/bus/i2c/ 20 # echo slave-24c512ro 0x1042 > /sys/bus/i2c/devices/i2c-1/new_device
21 21
22 You can also preload data during boot if a dev 22 You can also preload data during boot if a device-property named
23 'firmware-name' contains a valid filename (DT 23 'firmware-name' contains a valid filename (DT or ACPI only).
24 24
25 As of 2015, Linux doesn't support poll on bina 25 As of 2015, Linux doesn't support poll on binary sysfs files, so there is no
26 notification when another master changed the c 26 notification when another master changed the content.
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