This is what ChatGPT proposes:
#include <libusb-1.0/libusb.h>
#include <stdio.h>
void scan_devices(const char* target_string) {
libusb_device **devs;
libusb_context *ctx = NULL;
int r;
ssize_t cnt;
r = libusb_init(&ctx);
if (r < 0) return;
cnt = libusb_get_device_list(ctx, &devs);
if (cnt < 0) return;
for (ssize_t i = 0; i < cnt; i++) {
libusb_device *dev = devs[i];
libusb_device_handle *handle = NULL;
if (libusb_open(dev, &handle) == 0) {
// Iterate through all configurations and interfaces
struct libusb_config_descriptor *config;
libusb_get_config_descriptor(dev, 0, &config);
for (int j = 0; j < config->bNumInterfaces; j++) {
const struct libusb_interface *inter =
&config->interface[j];
const struct libusb_interface_descriptor *interdesc =
&inter->altsetting[0];
if (interdesc->iInterface) {
unsigned char buffer[256];
int len = libusb_get_string_descriptor_ascii(handle,
interdesc->iInterface, buffer, sizeof(buffer));
if (len > 0) {
printf("Interface %d: %s\n", j, buffer);
if (strcmp((char*)buffer, target_string) == 0) {
// Match found
printf("Match found for interface %d\n", j);
}
}
}
}
libusb_free_config_descriptor(config);
libusb_close(handle);
}
}
libusb_free_device_list(devs, 1);
libusb_exit(ctx);
}
int main() {
scan_devices("Particular String");
return 0;
}
On Wed, Feb 14, 2024 at 3:54 PM Muni Sekhar <munisekhar...@gmail.com> wrote:
> HI all,
>
> USB devices can have multiple interfaces (functional units) that serve
> different purposes (e.g., data transfer, control, audio, etc.).
>
> Each interface can have an associated string descriptor (referred to
> as iInterface). The string descriptor provides a human-readable name
> or description for the interface.
>
> From user space service utility, How to scan all the USB devices
> connected to the system and read each interface string
> descriptor(iInterface) and check whether it matches "Particular
> String" or not.
>
> The service program should trigger scanning all the USB devices on any
> USB device detection or removal. Can libusb be used for it?
>
> Any input would be appreciated.
>
> --
> Thanks,
> Sekhar
>
