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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /Documentation/i2c/slave-eeprom-backend.rst | |
| parent | Initial commit. (diff) | |
| download | linux-upstream/6.1.76.tar.xz linux-upstream/6.1.76.zip | |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/i2c/slave-eeprom-backend.rst')
| -rw-r--r-- | Documentation/i2c/slave-eeprom-backend.rst | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/i2c/slave-eeprom-backend.rst b/Documentation/i2c/slave-eeprom-backend.rst new file mode 100644 index 000000000..38d951f10 --- /dev/null +++ b/Documentation/i2c/slave-eeprom-backend.rst @@ -0,0 +1,26 @@ +============================== +Linux I2C slave EEPROM backend +============================== + +by Wolfram Sang <wsa@sang-engineering.com> in 2014-20 + +This backend simulates an EEPROM on the connected I2C bus. Its memory contents +can be accessed from userspace via this file located in sysfs:: + + /sys/bus/i2c/devices/<device-directory>/slave-eeprom + +The following types are available: 24c02, 24c32, 24c64, and 24c512. Read-only +variants are also supported. The name needed for instantiating has the form +'slave-<type>[ro]'. Examples follow: + +24c02, read/write, address 0x64: + # echo slave-24c02 0x1064 > /sys/bus/i2c/devices/i2c-1/new_device + +24c512, read-only, address 0x42: + # echo slave-24c512ro 0x1042 > /sys/bus/i2c/devices/i2c-1/new_device + +You can also preload data during boot if a device-property named +'firmware-name' contains a valid filename (DT or ACPI only). + +As of 2015, Linux doesn't support poll on binary sysfs files, so there is no +notification when another master changed the content. |