在 Linux/C++ 中枚举 USB 设备

Question

Im writing IO routines for a linux device that will have various and changing USB devices connected to it. To this end I need to be able to figure out which device is connected to which port so I can open it with the correct software. Something akin to 'udevinfo' would be ideal but I have no idea how to start in writing such.

Suggestions on c++ apis to read?

Answer 1

Take a look at libudev++ . It seems to be what you're looking for.

Answer 2

请参阅libusb的libusb_get_device_list ， libusb_get_bus_number ， libusb_get_device_address 。

Answer 3

GIO should help you in that. Connecting to the volume-added and volume-removed signals will alert your program to any storage device added or removed from the system. If you do not need the level of control provided by GIO, you can use libudev++ which provided a high level wrapper over GIO.

Answer 4

我不知道你需要什么样的信息，但你可以通过/ sys / bus / usb？

Answer 5

I ended up using a BASH solution in the chkconfig file. I walk through all ttyUSB entries and look at the driver info for each:

USB_ID=`egrep -i "mct u232|pl2303|keyspan" -m 1 /proc/tty/driver/usbserial | awk '{ printf( "$d", $1 )}'`
if [ -z $USB_ID ]
then
   echo $echo_n "No USB serial adapter found.";
   exit 1
fi

Answer 6

More recent solution:

Iterate over these file system directories:

/dev/serial/by-id
/dev/snd/by-id
/dev/disk/by-id
/dev/input/by-id
/dev/v4l/by-id

depending on what device class you are looking for.

For example, finding the serial port for my Arduino Nano:

#include <filesystem>
#include <string>

const std::string path = "/dev/serial/by-id";

for( const auto & file : std::filesystem::directory_iterator( path ) )
{
    const std::string s = "NANO_33_IoT";
    if( file.path().generic_string().find(s) )
    {
        return file.path();
    }
}