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Add functions to get serial port path from USB VID/PID for both Windows and Linux. Use this function to automatically detect the presence of an NZXT Hue+.

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This commit is contained in:
Adam Honse 2019-12-30 01:21:49 -06:00
parent bfd8030438
commit 5074a923d1
6 changed files with 266 additions and 65 deletions
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119
serial_port/find_usb_serial_port_linux.cpp Normal file
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#include "find_usb_serial_port.h"
#include <unistd.h>
#include <dirent.h>
/*---------------------------------------------------------------------*\
| |
| find_usb_serial_port |
| |
| This function returns the name of the first USB serial port matching|
| the given USB product and vendor ID. |
| |
| vid: Vendor ID code |
| pid: Product ID code |
| |
| returns: std::string containing port name "COMx" or "/dev/ttyX" |
| |
\*---------------------------------------------------------------------*/
std::string find_usb_serial_port(unsigned short vid, unsigned short pid)
{
std::string ret_string = "";
DIR* dir;
char symlink_path[1024] = {0};
struct dirent* ent;
char vid_pid[10] = {0}; //Store VID/PID
/*-----------------------------------------------------------------*\
| Open /sys/class/tty |
\*-----------------------------------------------------------------*/
dir = opendir("/sys/class/tty");
if(dir == NULL)
{
closedir(dir);
return ret_string;
}
/*-----------------------------------------------------------------*\
| Loop through all symlinks in /sys/class/tty directory to find |
| paths with "usb" in them. These links should have the USB device |
| index which can be used to find the VID/PID |
\*-----------------------------------------------------------------*/
ent = readdir(dir);
while(ent != NULL)
{
if(ent->d_type == DT_LNK)
{
char tty_path[1024];
strcpy(tty_path, "/sys/class/tty/");
strcat(tty_path, ent->d_name);
readlink(tty_path, symlink_path, 1024);
char * usb_string = strstr(symlink_path, "usb");
if(usb_string != NULL)
{
char * usb_dev = strstr(usb_string, "/");
usb_dev++;
usb_dev = strtok(usb_dev, "/");
char usb_path[1024];
strcpy(usb_path, "/sys/bus/usb/devices/");
strcat(usb_path, usb_dev);
char vendor_path[1024];
char product_path[1024];
strcpy(vendor_path, usb_path);
strcat(vendor_path, "/idVendor");
strcpy(product_path, usb_path);
strcat(product_path, "/idProduct");
std::ifstream vendor_file;
std::ifstream product_file;
std::string vendor_string;
std::string product_string;
vendor_file.open(vendor_path);
product_file.open(product_path);
std::getline(vendor_file, vendor_string);
std::getline(product_file, product_string);
snprintf(vid_pid, 10, "%04x", vid);
if(strcmp(vid_pid, vendor_string.c_str()) == 0)
{
snprintf(vid_pid, 10, "%04x", pid);
if(strcmp(vid_pid, product_string.c_str()) == 0)
{
char* port_string = NULL;
for(int i = strlen(tty_path); i > 0; i--)
{
if(tty_path[i] == '/')
{
port_string = &tty_path[i + 1];
break;
}
}
ret_string.append("/dev/");
ret_string.append(port_string);
return ret_string;
}
}
}
}
ent = readdir(dir);
}
return ret_string;
} /* find_usb_serial_port() */