如何从用户空间（linux i2c-dev）读取i2c适配器类（例如I2C_CLASS_DDC）？
在笔记本电脑之外，更改显示器的亮度等需要 DDC/CI。我相信，这最好在用户空间中完成。加载i2c-dev（内核模块）可以访问/dev/i2c-下的i2c总线。不幸的是，不仅支持 DDC/CI 的显示器具有 i2c 总线，而且在不相关的总线上读/写、同时试图找到哪个连接到哪个总线也远非理想。
看起来 i2c 总线适配器驱动程序已经对其总线进行了分类：例如 I2C_CLASS_DDC 正是我正在寻找的。
有没有办法查看 i2c-dev 设备的适配器类？
（或者同样好：有什么方法可以匹配我想从 X11 工作区或类似的 DDC/CI 与之交谈的设备吗？）
Outside of Laptops, changing e.g. brightness of monitors requires DDC/CI. This is best done in userspace, I believe. Loading i2c-dev (kernel module) gives access to i2c-buses under /dev/i2c-<number>. Unfortunately not just monitors supporting DDC/CI have i2c-buses and it is far from ideal to read/write on unrelated buses, while trying to find which connects to what.
It seems that i2c bus adapter drivers already categorize their buses: e.g. I2C_CLASS_DDC for exactly what I’m looking for.
Is there any way to see the adapter class of a i2c-dev device?
(Or equally good: any way to match the device I want to talk to for DDC/CI from X11 workspaces or similar?)
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您可以尝试查看 ddccontrol：
ddccontrol -p
该实用程序扫描 I2C 并以某种方式检测哪些连接到监视器。
您可以检查其源代码并找到解决方案。
聚苯乙烯
这可能不是一个答案，但是，抱歉，我没有足够的“声誉”来撰写评论。
You can try to look at ddccontrol:
ddccontrol -p
This utility scan I2Cs and somehow detects which are connected to monitors.
You can examine it's source code and find solution.
P.S.
This may be not an answer, but, sorry, I have not enough "reputation" to write a comment.