This is some example by type master device: DS9490 This device has native support in linux just plug in. #lfelc Linux I2C Drivers • Define and allocate a private data struct (contains struct i2c_adapter) • Fill algorithm struct –.master_xfer() –function to perform transfer –.functionality() –function to retrieve bus functionality. But our application code also has a non-trivial I2C module that contains all the work-around intelligence for dealing with all the various devices we have experience with. Native Linux kernel driver Make work master device First must be make work master device. 1. The programming interface is structured around two kinds of driver, and two kinds of device. A driver may be bound to this device when we return from this function, or any later moment (e.g. Utilized with Sharp GP2D12 IR Range Sensors. maybe hotplugging will load the driver module). A short story of getting a tiny, cheap USB I²C adapter for a home server, learning about the Industrial I/O linux subsystem, and connecting it to collectd. The driver.name field should be set to the name of this driver. I2C bus subsystem in the Linux kernel, I2C bus model is divided into master / slave two ends, the main end is mainly adapter and adapter driver responsible for the management of the bus, the slave side is mainly composed of slave device abstraction and device driver to realize the specific application of slave device. Pastebin.com is the number one paste tool since 2002. To get to know the major number assigned to your module look in /proc/devices,after insmod. (That link is broken. NAME i2cget - read from I2C/SMBus chip registers SYNOPSIS i2cget [-f] [-y] i2cbus chip-address [data-address [mode]] i2cget-V DESCRIPTION i2cget is a small helper program to read registers visible through the I2C bus (or SMBus). mknod /dev/"device name" [types of device character/block] [major number] [minor number] The source code might not have the major number if it follows dynamic allocation of major number. Depending on the driver it can have child nodes or parent node. Pastebin is a website where you can store text online for a set period of time. • Fill adaptor struct – i2c_set_adapdata() –.algo –pointer to algorithm struct –.algo_data –pointer the private data struct If you get a warning about I2C_SLAVE not being defined, you may need to include both and (The location has changed in newer kernels vs. older kernels and the above example is for newer) Tested Devices. Each module in device tree is defined by a node and all its properties are defined under that node. The Linux I2C programming interfaces support the master side of bus interactions and the slave side. Also, when dealing with I2C issues, I often find that I need to re-acquaint myself with the source spec: OPTIONS-V Display the version and exit. -f Force access to the device even if it is already busy. For automatic device detection, both detect and address_list must be defined. Linux automatically load these modules: wire,w1_smem,w1_therm,ds2490 DS2482 This device has also native support in linux, bat start is more difficult. For example a device connected by i2c bus, will have i2c as its parent node, and that device will be one of the child node of i2c node, i2c may have apd bus as its parent and so on. We use linux (CELinux) and an I2C device driver with Linux as well. AD7991 Quad Input ADC. This call is not appropriate for use by mainboard initialization logic, which usually runs during an arch_initcall long before any i2c_adapter could exist. 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