What is I2C Dev?
You can think of i2c-dev as a generic I2C chip driver that can be programmed from user-space. 3* Some ioctl() calls are for administrative tasks and are handled by i2c-dev directly.
What is I2C kernel?
I²C (pronounce: I squared C and written I2C in the kernel documentation) is a protocol developed by Philips. It is a slow two-wire protocol (variable speed, up to 400 kHz), with a high speed extension (3.4 MHz). I2C is widely used with embedded systems. …
Is SMBus an I2C?
SMBus is built on I2C and is therefore generally compatible with I2C devices, though not in all respects. I2C allows several modes, Standard, Fast and High-Speed. Standard mode allows clock frequencies as high as 100kHz while Fast and High-Speed modes are faster.
How are I2C devices controlled by kernel drivers?
Usually, I2C devices are controlled by a kernel driver. But it is also possible to access all devices on an adapter from userspace, through the /dev interface. You need to load module i2c-dev for this. Each registered I2C adapter gets a number, counting from 0. You can examine /sys/class/i2c-dev/ to see what number corresponds to which adapter.
How are I2C devices controlled in userspace?
Usually, I2C devices are controlled by a kernel driver. But it is also possible to access all devices on an adapter from userspace, through the /dev interface. You need to load module i2c-dev for this. Each registered I2C adapter gets a number, counting from 0.
How to bind a device to an I2C core?
New method (sysfs interface): Old method (module parameters): New method (sysfs interface): Of course, it is important to instantiate the “dummy” device before loading the driver. The dummy device will be handled by i2c-core itself, preventing other drivers from binding to it later on.
How is a dummy device handled in I2C core?
The dummy device will be handled by i2c-core itself, preventing other drivers from binding to it later on. If there is a real device at the problematic address, and you want another driver to bind to it, then simply pass the name of the device in question instead of “dummy”.