在Linux上读取USB输入流

发布于 2024-09-24 01:57:28 字数 419 浏览 5 评论 0原文

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 目录中没有任何这样的东西。我假设它会像 /dev/ttyUSB01 或 /dev/input/usb 或类似的东西，但它不在那里。 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

我已扫描过 /sys/class/input/input2 ，但我不太确定我在寻找什么。也许有人可以指出我正确的方向？

原文

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

[ 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?

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秉烛思 2024-10-01 01:57:28

几天前遇到了同样的问题，我们发现了这个解决方法。

您可以在终端执行以下命令：

cat /proc/bus/input/devices

这将列出您连接的设备，并且您的设备应该在列表中。例如，其中的一项对我来说是这样显示的：

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

在“处理程序”下，您会注意到出现了 event15。在我的例子中，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

Had the same problem a few days ago and we discovered this workaround.

You could do the following command at the terminal:

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:

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

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昇り龍 2024-10-01 01:57:28

查看 /dev/input/by-path 并查找您的 usb-0000:00:0f.4-1。在我的 Ubuntu 盒子上，这是设备的符号链接。

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梦幻之岛 2024-10-01 01:57:28

您尝试过使用 mdev 吗？它是 udev 的轻量级替代品，并且填充 /dev。如果未启用热插拔，您可能需要手动运行它。

要扫描 /sys 并创建设备，请尝试：

mdev -s

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.

To scan /sys and create devices, try: