在 linux 上读取 USB 输入流
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/3737655/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Reading USB input stream on linux
提问by Dalton Conley
I'm working on an embedded linux machine and trying to read a USB devices input stream, but for some reason I don't have any such thing in my /dev directory. I would assume it would be something like /dev/ttyUSB01 or /dev/input/usb or something similar, but it's not there. dmesg returns the following
我正在嵌入式 linux 机器上工作并尝试读取 USB 设备输入流，但由于某种原因，我的 /dev 目录中没有任何此类内容。我认为它会像 /dev/ttyUSB01 或 /dev/input/usb 或类似的东西，但它不存在。dmesg 返回以下内容
[ 195.863911] input: GIT GIT USB READER as /class/input/input2
[ 195.864259] generic-usb 0003:1234:5678.0001: input: USB HID v1.00 Keyboard [GIT GIT USB READER] on usb-0000:00:0f.4-1/input0
I've scanned through /sys/class/input/input2 and I am not really sure what I'm looking for. Maybe someone could point me in the right direction?
我已经浏览了 /sys/class/input/input2 并且我不确定我在寻找什么。也许有人可以指出我正确的方向？
采纳答案by Karl Bielefeldt
Check out /dev/input/by-pathand look for your usb-0000:00:0f.4-1. On my Ubuntu box that's a symbolic link to the device.
检查/dev/input/by-path并寻找您的usb-0000:00:0f.4-1. 在我的 Ubuntu 盒子上，这是一个指向设备的符号链接。
回答by Bjorn
Have you tried using mdev? It's a lightweight alternative to udev and it populates /dev. If hotplugging is not enabled you might need to run it manually.
你试过使用 mdev 吗？它是 udev 的轻量级替代品，它填充 /dev。如果未启用热插拔，您可能需要手动运行它。
To scan /sys and create devices, try:
要扫描 /sys 并创建设备，请尝试：
mdev -s
回答by Lee Torres
Had the same problem a few days ago and we discovered this workaround.
几天前遇到了同样的问题，我们发现了这个解决方法。
You could do the following command at the terminal:
您可以在终端执行以下命令：
cat /proc/bus/input/devices
This will list your devices connected, and your devices should be on the list. For instance, one item on there appears this way for me:
这将列出您连接的设备，并且您的设备应该在列表中。例如，那里的一项对我来说是这样的：
I: Bus=0011 Vendor=0002 Product=000a Version=0000
N: Name="TPPS/2 IBM TrackPoint"
P: Phys=synaptics-pt/serio0/input0
S: Sysfs=/devices/platform/i8042/serio4/serio5/input/input15
U: Uniq=
H: Handlers=mouse1 event15
B: PROP=0
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=3
Under Handlers, you'll notice that event15 shows up. You can access the data stream by referencing /dev/input/event15 in my case. You'll have to figure out what it is in your case
在处理程序下，您会注意到 event15 出现了。在我的情况下，您可以通过引用 /dev/input/event15 来访问数据流。你必须弄清楚你的情况是什么
