/* * This file is part of the libserialport project. * * Copyright (C) 2014 Aurelien Jacobs * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see . */ #include "libserialport.h" #include "libserialport_internal.h" SP_PRIV enum sp_return get_port_details(struct sp_port *port) { /* Description limited to 127 char, anything longer would not be user friendly anyway */ char description[128]; int bus, address; unsigned int vid, pid; char manufacturer[128], product[128], serial[128]; char baddr[32]; const char dir_name[] = "/sys/class/tty/%s/device/%s%s"; char sub_dir[32] = "", file_name[PATH_MAX]; char *ptr, *dev = port->name + 5; FILE *file; int i, count; if (strncmp(port->name, "/dev/", 5)) RETURN_ERROR(SP_ERR_ARG, "Device name not recognized."); snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev); count = readlink(file_name, file_name, sizeof(file_name)); if (count <= 0 || count >= (int) sizeof(file_name)-1) RETURN_ERROR(SP_ERR_ARG, "Device not found."); file_name[count] = 0; if (strstr(file_name, "bluetooth")) port->transport = SP_TRANSPORT_BLUETOOTH; else if (strstr(file_name, "usb")) port->transport = SP_TRANSPORT_USB; if (port->transport == SP_TRANSPORT_USB) { for (i=0; i<5; i++) { strcat(sub_dir, "../"); snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum"); if (!(file = fopen(file_name, "r"))) continue; count = fscanf(file, "%d", &bus); fclose(file); if (count != 1) continue; snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum"); if (!(file = fopen(file_name, "r"))) continue; count = fscanf(file, "%d", &address); fclose(file); if (count != 1) continue; snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor"); if (!(file = fopen(file_name, "r"))) continue; count = fscanf(file, "%4x", &vid); fclose(file); if (count != 1) continue; snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct"); if (!(file = fopen(file_name, "r"))) continue; count = fscanf(file, "%4x", &pid); fclose(file); if (count != 1) continue; port->usb_bus = bus; port->usb_address = address; port->usb_vid = vid; port->usb_pid = pid; snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product"); if ((file = fopen(file_name, "r"))) { if ((ptr = fgets(description, sizeof(description), file))) { ptr = description + strlen(description) - 1; if (ptr >= description && *ptr == '\n') *ptr = 0; port->description = strdup(description); } fclose(file); } if (!file || !ptr) port->description = strdup(dev); snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer"); if ((file = fopen(file_name, "r"))) { if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) { ptr = manufacturer + strlen(manufacturer) - 1; if (ptr >= manufacturer && *ptr == '\n') *ptr = 0; port->usb_manufacturer = strdup(manufacturer); } fclose(file); } snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product"); if ((file = fopen(file_name, "r"))) { if ((ptr = fgets(product, sizeof(product), file))) { ptr = product + strlen(product) - 1; if (ptr >= product && *ptr == '\n') *ptr = 0; port->usb_product = strdup(product); } fclose(file); } snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial"); if ((file = fopen(file_name, "r"))) { if ((ptr = fgets(serial, sizeof(serial), file))) { ptr = serial + strlen(serial) - 1; if (ptr >= serial && *ptr == '\n') *ptr = 0; port->usb_serial = strdup(serial); } fclose(file); } break; } } else { port->description = strdup(dev); if (port->transport == SP_TRANSPORT_BLUETOOTH) { snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address"); if ((file = fopen(file_name, "r"))) { if ((ptr = fgets(baddr, sizeof(baddr), file))) { ptr = baddr + strlen(baddr) - 1; if (ptr >= baddr && *ptr == '\n') *ptr = 0; port->bluetooth_address = strdup(baddr); } fclose(file); } } } RETURN_OK(); } SP_PRIV enum sp_return list_ports(struct sp_port ***list) { char name[PATH_MAX], target[PATH_MAX]; struct dirent entry, *result; #ifdef HAVE_SERIAL_STRUCT struct serial_struct serial_info; int ioctl_result; #endif char buf[sizeof(entry.d_name) + 16]; int len, fd; DIR *dir; int ret = SP_OK; DEBUG("Enumerating tty devices"); if (!(dir = opendir("/sys/class/tty"))) RETURN_FAIL("could not open /sys/class/tty"); DEBUG("Iterating over results"); while (!readdir_r(dir, &entry, &result) && result) { snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name); len = readlink(buf, target, sizeof(target)); if (len <= 0 || len >= (int) sizeof(target)-1) continue; target[len] = 0; if (strstr(target, "virtual")) continue; snprintf(name, sizeof(name), "/dev/%s", entry.d_name); DEBUG_FMT("Found device %s", name); if (strstr(target, "serial8250")) { /* The serial8250 driver has a hardcoded number of ports. * The only way to tell which actually exist on a given system * is to try to open them and make an ioctl call. */ DEBUG("serial8250 device, attempting to open"); if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) { DEBUG("open failed, skipping"); continue; } #ifdef HAVE_SERIAL_STRUCT ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info); #endif close(fd); #ifdef HAVE_SERIAL_STRUCT if (ioctl_result != 0) { DEBUG("ioctl failed, skipping"); continue; } if (serial_info.type == PORT_UNKNOWN) { DEBUG("port type is unknown, skipping"); continue; } #endif } DEBUG_FMT("Found port %s", name); *list = list_append(*list, name); if (!list) { SET_ERROR(ret, SP_ERR_MEM, "list append failed"); break; } } closedir(dir); return ret; }