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https://www.kernel.org/doc/html/v4.14/driver-api/i2c.html
I 2 C and SMBus Subsystem¶ I 2 C (or without fancy typography, “I2C”) is an acronym for the “Inter-IC” bus, a simple bus protocol which is widely used where low data rate communications suffice. Since it’s also a licensed trademark, some vendors use another name (such as …
https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c
So, since the Raspberry Pi can talk I2C we can connect it to a variety of I2C capable chips and modules. ... Installing Kernel Support (with Raspi-Config) Run sudo raspi-config and follow the prompts to install i2c support for the ARM core and linux kernel. Go to Interfacing Options.
https://www.kernel.org/doc/html/v4.19/driver-api/i2c.html
I2C is a multi-master bus; open drain signaling is used to arbitrate between masters, as well as to handshake and to synchronize clocks from slower clients. The Linux I2C programming interfaces support the master side of bus interactions and the slave side. The programming interface is structured around two kinds of driver, and two kinds of device.
https://www.linuxjournal.com/article/7136
Dec 01, 2003 · The 2.4 kernel contains a bit of I2C support, mainly for some video drivers. With the 2.6 kernel, a large portion of the I2C code has made it into the main kernel tree, thanks to the effort of a number of kernel developers who changed the interfaces to be more acceptable to the kernel community.
https://i2c.wiki.kernel.org/index.php/Linux_2.6_I2C_development_FAQ
What about this i2c SVN repository hosted on lm-sensors.org? That repository holds a modified version of the Linux 2.4 i2c subsystem, which was needed to use lm-sensors on Linux 2.4. It has nothing to do with the current i2c development. For Linux 2.6 and 3, the development happens directly in the Linux kernel tree, there is no external repository.
https://hwmon.wiki.kernel.org/device_support_status_n_o
Since kernel 2.6.36, manual fan speed control and temperature monitoring are also supported. Nuvoton (formerly Winbond) W83793G/AG: yes : w83793 : I2C : 2.6.20 (2006-12-08) Linux 2.6 driver contributed by Yuan Mu and Rudolf Marek. User-space support available since lm_sensors 2.10.1. Watchdog support added in kernel 2.6.34. Nuvoton (formerly ...
https://github.com/OP-TEE/optee_os/issues/2957
Apr 18, 2019 · It seems the kernel image in /boot directory does not support I2C/Device tree? I do see the file bcm2710-rpi-3-b.dtb exists though. If I boot with the other kernel comes with Ubuntu (say kernel=kernel8.bin in config.txt) then I2C works fine (however, this disables TZ/OPTEE).
https://i2c.wiki.kernel.org/index.php/I2C_bus_multiplexing
Support for I2C bus multiplexing was written by Rodolfo Giometti and Michael Lawnick with the help of Jean Delvare. It was first available in kernel version 2.6.36. Summary of Implementation . This implementation lets the I2C core handle multiplexed I2C bus topologies by presenting each multiplexed segment as an independent I2C adapter.
https://how-to.fandom.com/wiki/How_to_configure_the_Linux_kernel/drivers/i2c
Howto configure the Linux kernel / drivers / i2c Character device configuration Option: I2C Kernel Versions: 2.6.15.6 ... (on/off/module) I2C support I2C (pronounce: I-square-C) is a slow serial bus protocol used in many micro controller applications and developed by Philips. SMBus, or System Management Bus is a subset of the I2C protocol. More information is contained in the directory <file ...
https://raspberrypi.stackexchange.com/questions/26731/do-we-need-to-put-i2c-code-into-kernel
I see codes to make i2c device (e.g. i2c sensors) work in user space, just need kernel to support /dev/i2c-0 or /dev/i2c-1. But whether do we need to put the codes into Linux kernel? For example, if i2c interrupt is applied, how to know when should we read the i2c device in user space? I am confusing.
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