i2c.wiki.kernel.orgLinux i2c Wiki

Main Page From Jump to: navigation , search OBSOLETE CONTENT This wiki has been archived and the content is no longer updated. Linux i2c Subsystem This is the home of the Linux i2c subsystem. Theory of operation Driver Architecture I2C protocol summary SMBus protocol summary 10-bit addresses information /dev interface documentation I2C adapter functionalities I2C bus multiplexing complex I2C topologies Developer’s documentation Linux 2.6 I2C development FAQ Conventions for use of fault codes in the I2C/SMBus stack How to instantiate I2C devices Writing kernel drivers for I2C or SMBus devices i2c-stub, a fake I2C/SMBus master driver for testing purpose User-space tools User-space tools for I2C/SMBus are being maintained in the i2c-tools git tree . Released versions can be downloaded from https://www.kernel.org/pub/software/utils/i2c-tools/ . Work in progress increase SMBus max block size from 32 to 255 as documented in the 3.x specification. Hardest problem is to not break userspace ABI. To-do list The i2c-dev driver needs to be ported to the new i2c device driver binding model. See this discussion and this bug report . i2c_adapter.retries and i2c_adapter.timeout need to be clarified. Their original intent was not necessarily good nor clear, but they could still be useful, if fault codes returned by adapter drivers are also clarified. Exclusive access to bus segments or devices. The former can partly be done in-kernel since version 3.6 (i2c_lock_adapter / __i2c_transfer / i2c_unlock_adapter) or the SMBus equivalent. Also the user-space case mentioned here is not supported yet. The kernel should be able to prevent probing of specific I2C bus segments from user-space. Either by exposing the class flags and hoping user-space will pay attention and be fair, or by defining one more class flag for user-space access and enforcing it. Old pages Subsystem History - up to Linux 3.6 Retrieved from " https://i2c.wiki.kernel.org/index.php?title=Main_Page&oldid=1686 " Views Page Discussion View source History Personal tools Log in / create account Navigation Main page Recent changes Random page Search Tools What links here Related changes Special pages Printable version Permanent link This page was last modified on 10 March 2021, at 20:35. Privacy policy About...