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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 | SP_PRIV enum sp_return get_port_details(struct sp_port *port) | |
24 | { | |
25 | /* | |
26 | * Description limited to 127 char, anything longer | |
27 | * would not be user friendly anyway. | |
28 | */ | |
29 | char description[128]; | |
30 | int bus, address; | |
31 | unsigned int vid, pid; | |
32 | char manufacturer[128], product[128], serial[128]; | |
33 | char baddr[32]; | |
34 | const char dir_name[] = "/sys/class/tty/%s/device/%s%s"; | |
35 | char sub_dir[32] = "", file_name[PATH_MAX]; | |
36 | char *ptr, *dev = port->name + 5; | |
37 | FILE *file; | |
38 | int i, count; | |
39 | struct stat statbuf; | |
40 | ||
41 | if (strncmp(port->name, "/dev/", 5)) | |
42 | RETURN_ERROR(SP_ERR_ARG, "Device name not recognized"); | |
43 | ||
44 | snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev); | |
45 | if (lstat(file_name, &statbuf) == -1) | |
46 | RETURN_ERROR(SP_ERR_ARG, "Device not found"); | |
47 | if (!S_ISLNK(statbuf.st_mode)) | |
48 | snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s/device", dev); | |
49 | count = readlink(file_name, file_name, sizeof(file_name)); | |
50 | if (count <= 0 || count >= (int)(sizeof(file_name) - 1)) | |
51 | RETURN_ERROR(SP_ERR_ARG, "Device not found"); | |
52 | file_name[count] = 0; | |
53 | if (strstr(file_name, "bluetooth")) | |
54 | port->transport = SP_TRANSPORT_BLUETOOTH; | |
55 | else if (strstr(file_name, "usb")) | |
56 | port->transport = SP_TRANSPORT_USB; | |
57 | ||
58 | if (port->transport == SP_TRANSPORT_USB) { | |
59 | for (i = 0; i < 5; i++) { | |
60 | strcat(sub_dir, "../"); | |
61 | ||
62 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum"); | |
63 | if (!(file = fopen(file_name, "r"))) | |
64 | continue; | |
65 | count = fscanf(file, "%d", &bus); | |
66 | fclose(file); | |
67 | if (count != 1) | |
68 | continue; | |
69 | ||
70 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum"); | |
71 | if (!(file = fopen(file_name, "r"))) | |
72 | continue; | |
73 | count = fscanf(file, "%d", &address); | |
74 | fclose(file); | |
75 | if (count != 1) | |
76 | continue; | |
77 | ||
78 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor"); | |
79 | if (!(file = fopen(file_name, "r"))) | |
80 | continue; | |
81 | count = fscanf(file, "%4x", &vid); | |
82 | fclose(file); | |
83 | if (count != 1) | |
84 | continue; | |
85 | ||
86 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct"); | |
87 | if (!(file = fopen(file_name, "r"))) | |
88 | continue; | |
89 | count = fscanf(file, "%4x", &pid); | |
90 | fclose(file); | |
91 | if (count != 1) | |
92 | continue; | |
93 | ||
94 | port->usb_bus = bus; | |
95 | port->usb_address = address; | |
96 | port->usb_vid = vid; | |
97 | port->usb_pid = pid; | |
98 | ||
99 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product"); | |
100 | if ((file = fopen(file_name, "r"))) { | |
101 | if ((ptr = fgets(description, sizeof(description), file))) { | |
102 | ptr = description + strlen(description) - 1; | |
103 | if (ptr >= description && *ptr == '\n') | |
104 | *ptr = 0; | |
105 | port->description = strdup(description); | |
106 | } | |
107 | fclose(file); | |
108 | } | |
109 | if (!file || !ptr) | |
110 | port->description = strdup(dev); | |
111 | ||
112 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer"); | |
113 | if ((file = fopen(file_name, "r"))) { | |
114 | if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) { | |
115 | ptr = manufacturer + strlen(manufacturer) - 1; | |
116 | if (ptr >= manufacturer && *ptr == '\n') | |
117 | *ptr = 0; | |
118 | port->usb_manufacturer = strdup(manufacturer); | |
119 | } | |
120 | fclose(file); | |
121 | } | |
122 | ||
123 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product"); | |
124 | if ((file = fopen(file_name, "r"))) { | |
125 | if ((ptr = fgets(product, sizeof(product), file))) { | |
126 | ptr = product + strlen(product) - 1; | |
127 | if (ptr >= product && *ptr == '\n') | |
128 | *ptr = 0; | |
129 | port->usb_product = strdup(product); | |
130 | } | |
131 | fclose(file); | |
132 | } | |
133 | ||
134 | snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial"); | |
135 | if ((file = fopen(file_name, "r"))) { | |
136 | if ((ptr = fgets(serial, sizeof(serial), file))) { | |
137 | ptr = serial + strlen(serial) - 1; | |
138 | if (ptr >= serial && *ptr == '\n') | |
139 | *ptr = 0; | |
140 | port->usb_serial = strdup(serial); | |
141 | } | |
142 | fclose(file); | |
143 | } | |
144 | ||
145 | /* If present, add serial to description for better identification. */ | |
146 | if (port->usb_serial && strlen(port->usb_serial)) { | |
147 | snprintf(description, sizeof(description), | |
148 | "%s - %s", port->description, port->usb_serial); | |
149 | if (port->description) | |
150 | free(port->description); | |
151 | port->description = strdup(description); | |
152 | } | |
153 | ||
154 | break; | |
155 | } | |
156 | } else { | |
157 | port->description = strdup(dev); | |
158 | ||
159 | if (port->transport == SP_TRANSPORT_BLUETOOTH) { | |
160 | snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address"); | |
161 | if ((file = fopen(file_name, "r"))) { | |
162 | if ((ptr = fgets(baddr, sizeof(baddr), file))) { | |
163 | ptr = baddr + strlen(baddr) - 1; | |
164 | if (ptr >= baddr && *ptr == '\n') | |
165 | *ptr = 0; | |
166 | port->bluetooth_address = strdup(baddr); | |
167 | } | |
168 | fclose(file); | |
169 | } | |
170 | } | |
171 | } | |
172 | ||
173 | RETURN_OK(); | |
174 | } | |
175 | ||
176 | SP_PRIV enum sp_return list_ports(struct sp_port ***list) | |
177 | { | |
178 | char name[PATH_MAX], target[PATH_MAX]; | |
179 | struct dirent entry, *result; | |
180 | #ifdef HAVE_SERIAL_STRUCT | |
181 | struct serial_struct serial_info; | |
182 | int ioctl_result; | |
183 | #endif | |
184 | char buf[sizeof(entry.d_name) + 23]; | |
185 | int len, fd; | |
186 | DIR *dir; | |
187 | int ret = SP_OK; | |
188 | struct stat statbuf; | |
189 | ||
190 | DEBUG("Enumerating tty devices"); | |
191 | if (!(dir = opendir("/sys/class/tty"))) | |
192 | RETURN_FAIL("Could not open /sys/class/tty"); | |
193 | ||
194 | DEBUG("Iterating over results"); | |
195 | while (!readdir_r(dir, &entry, &result) && result) { | |
196 | snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name); | |
197 | if (lstat(buf, &statbuf) == -1) | |
198 | continue; | |
199 | if (!S_ISLNK(statbuf.st_mode)) | |
200 | snprintf(buf, sizeof(buf), "/sys/class/tty/%s/device", entry.d_name); | |
201 | len = readlink(buf, target, sizeof(target)); | |
202 | if (len <= 0 || len >= (int)(sizeof(target) - 1)) | |
203 | continue; | |
204 | target[len] = 0; | |
205 | if (strstr(target, "virtual")) | |
206 | continue; | |
207 | snprintf(name, sizeof(name), "/dev/%s", entry.d_name); | |
208 | DEBUG_FMT("Found device %s", name); | |
209 | if (strstr(target, "serial8250")) { | |
210 | /* | |
211 | * The serial8250 driver has a hardcoded number of ports. | |
212 | * The only way to tell which actually exist on a given system | |
213 | * is to try to open them and make an ioctl call. | |
214 | */ | |
215 | DEBUG("serial8250 device, attempting to open"); | |
216 | if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) { | |
217 | DEBUG("Open failed, skipping"); | |
218 | continue; | |
219 | } | |
220 | #ifdef HAVE_SERIAL_STRUCT | |
221 | ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info); | |
222 | #endif | |
223 | close(fd); | |
224 | #ifdef HAVE_SERIAL_STRUCT | |
225 | if (ioctl_result != 0) { | |
226 | DEBUG("ioctl failed, skipping"); | |
227 | continue; | |
228 | } | |
229 | if (serial_info.type == PORT_UNKNOWN) { | |
230 | DEBUG("Port type is unknown, skipping"); | |
231 | continue; | |
232 | } | |
233 | #endif | |
234 | } | |
235 | DEBUG_FMT("Found port %s", name); | |
236 | *list = list_append(*list, name); | |
237 | if (!list) { | |
238 | SET_ERROR(ret, SP_ERR_MEM, "List append failed"); | |
239 | break; | |
240 | } | |
241 | } | |
242 | closedir(dir); | |
243 | ||
244 | return ret; | |
245 | } |