linux.c

   1 /*
   2  * This file is part of the libserialport project.
   3  *
   4  * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License as
   8  * published by the Free Software Foundation, either version 3 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "libserialport.h"
  21 #include "libserialport_internal.h"
  22
  23 enum sp_return get_port_details(struct sp_port *port)
  24 {
  25         /* Description limited to 127 char,
  26            anything longer would not be user friendly anyway */
  27         char description[128];
  28         int bus, address, vid, pid = -1;
  29         char manufacturer[128], product[128], serial[128];
  30         char baddr[32];
  31         const char dir_name[] = "/sys/class/tty/%s/device/%s%s";
  32         char sub_dir[32] = "", file_name[PATH_MAX];
  33         char *ptr, *dev = port->name + 5;
  34         FILE *file;
  35         int i, count;
  36
  37         if (strncmp(port->name, "/dev/", 5))
  38                 RETURN_ERROR(SP_ERR_ARG, "Device name not recognized (%s)", port->name);
  39
  40         snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev);
  41         count = readlink(file_name, file_name, sizeof(file_name));
  42         if (count <= 0 || count >= (int) sizeof(file_name)-1)
  43                 RETURN_ERROR(SP_ERR_ARG, "Device not found (%s)", port->name);
  44         file_name[count] = 0;
  45         if (strstr(file_name, "bluetooth"))
  46                 port->transport = SP_TRANSPORT_BLUETOOTH;
  47         else if (strstr(file_name, "usb"))
  48                 port->transport = SP_TRANSPORT_USB;
  49
  50         if (port->transport == SP_TRANSPORT_USB) {
  51                 for (i=0; i<5; i++) {
  52                         strcat(sub_dir, "../");
  53
  54                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum");
  55                         if (!(file = fopen(file_name, "r")))
  56                                 continue;
  57                         count = fscanf(file, "%d", &bus);
  58                         fclose(file);
  59                         if (count != 1)
  60                                 continue;
  61
  62                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum");
  63                         if (!(file = fopen(file_name, "r")))
  64                                 continue;
  65                         count = fscanf(file, "%d", &address);
  66                         fclose(file);
  67                         if (count != 1)
  68                                 continue;
  69
  70                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor");
  71                         if (!(file = fopen(file_name, "r")))
  72                                 continue;
  73                         count = fscanf(file, "%4x", &vid);
  74                         fclose(file);
  75                         if (count != 1)
  76                                 continue;
  77
  78                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct");
  79                         if (!(file = fopen(file_name, "r")))
  80                                 continue;
  81                         count = fscanf(file, "%4x", &pid);
  82                         fclose(file);
  83                         if (count != 1)
  84                                 continue;
  85
  86                         port->usb_bus = bus;
  87                         port->usb_address = address;
  88                         port->usb_vid = vid;
  89                         port->usb_pid = pid;
  90
  91                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
  92                         if ((file = fopen(file_name, "r"))) {
  93                                 if ((ptr = fgets(description, sizeof(description), file))) {
  94                                         ptr = description + strlen(description) - 1;
  95                                         if (ptr >= description && *ptr == '\n')
  96                                                 *ptr = 0;
  97                                         port->description = strdup(description);
  98                                 }
  99                                 fclose(file);
 100                         }
 101                         if (!file || !ptr)
 102                                 port->description = strdup(dev);
 103
 104                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer");
 105                         if ((file = fopen(file_name, "r"))) {
 106                                 if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) {
 107                                         ptr = manufacturer + strlen(manufacturer) - 1;
 108                                         if (ptr >= manufacturer && *ptr == '\n')
 109                                                 *ptr = 0;
 110                                         port->usb_manufacturer = strdup(manufacturer);
 111                                 }
 112                                 fclose(file);
 113                         }
 114
 115                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
 116                         if ((file = fopen(file_name, "r"))) {
 117                                 if ((ptr = fgets(product, sizeof(product), file))) {
 118                                         ptr = product + strlen(product) - 1;
 119                                         if (ptr >= product && *ptr == '\n')
 120                                                 *ptr = 0;
 121                                         port->usb_product = strdup(product);
 122                                 }
 123                                 fclose(file);
 124                         }
 125
 126                         snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial");
 127                         if ((file = fopen(file_name, "r"))) {
 128                                 if ((ptr = fgets(serial, sizeof(serial), file))) {
 129                                         ptr = serial + strlen(serial) - 1;
 130                                         if (ptr >= serial && *ptr == '\n')
 131                                                 *ptr = 0;
 132                                         port->usb_serial = strdup(serial);
 133                                 }
 134                                 fclose(file);
 135                         }
 136
 137                         break;
 138                 }
 139         } else {
 140                 port->description = strdup(dev);
 141
 142                 if (port->transport == SP_TRANSPORT_BLUETOOTH) {
 143                         snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address");
 144                         if ((file = fopen(file_name, "r"))) {
 145                                 if ((ptr = fgets(baddr, sizeof(baddr), file))) {
 146                                         ptr = baddr + strlen(baddr) - 1;
 147                                         if (ptr >= baddr && *ptr == '\n')
 148                                                 *ptr = 0;
 149                                         port->bluetooth_address = strdup(baddr);
 150                                 }
 151                                 fclose(file);
 152                         }
 153                 }
 154         }
 155
 156         RETURN_OK();
 157 }