[libserialport.git] / linux.c

/*
 * This file is part of the libserialport project.
 *
 * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
 * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

#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;
	struct stat statbuf;

	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);
	if (lstat(file_name, &statbuf) == -1)
		RETURN_ERROR(SP_ERR_ARG, "Device not found");
	if (!S_ISLNK(statbuf.st_mode))
		snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s/device", 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);
			}

			/* If present, add serial to description for better identification. */
			if (port->usb_serial && strlen(port->usb_serial)) {
				snprintf(description, sizeof(description),
					"%s - %s", port->description, port->usb_serial);
				if (port->description)
					free(port->description);
				port->description = strdup(description);
			}

			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_STRUCT_SERIAL_STRUCT
	struct serial_struct serial_info;
	int ioctl_result;
#endif
	char buf[sizeof(entry.d_name) + 23];
	int len, fd;
	DIR *dir;
	int ret = SP_OK;
	struct stat statbuf;

	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);
		if (lstat(buf, &statbuf) == -1)
			continue;
		if (!S_ISLNK(statbuf.st_mode))
			snprintf(buf, sizeof(buf), "/sys/class/tty/%s/device", 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_STRUCT_SERIAL_STRUCT
			ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
#endif
			close(fd);
#ifdef HAVE_STRUCT_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;
}
Commit	Line	Data
e33dcf90 ML	1	/*
	2	* This file is part of the libserialport project.
	3	*
f77bb46d	4	* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
e33dcf90 ML	5	* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as
	9	* published by the Free Software Foundation, either version 3 of the
	10	* License, or (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include "libserialport.h"
	22	#include "libserialport_internal.h"
	23
970f279a	24	SP_PRIV enum sp_return get_port_details(struct sp_port *port)
e33dcf90	25	{
dc422c04 UH	26	/*
	27	* Description limited to 127 char, anything longer
	28	* would not be user friendly anyway.
	29	*/
e33dcf90	30	char description[128];
0666ccc7 ML	31	int bus, address;
0666ccc7 ML	32	unsigned int vid, pid;
e33dcf90 ML	33	char manufacturer[128], product[128], serial[128];
	34	char baddr[32];
	35	const char dir_name[] = "/sys/class/tty/%s/device/%s%s";
	36	char sub_dir[32] = "", file_name[PATH_MAX];
	37	char ptr, dev = port->name + 5;
	38	FILE *file;
	39	int i, count;
46d8b0a0	40	struct stat statbuf;
e33dcf90 ML	41
e33dcf90 ML	42	if (strncmp(port->name, "/dev/", 5))
dc422c04	43	RETURN_ERROR(SP_ERR_ARG, "Device name not recognized");
e33dcf90 ML	44
e33dcf90 ML	45	snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev);
46d8b0a0	46	if (lstat(file_name, &statbuf) == -1)
	47	RETURN_ERROR(SP_ERR_ARG, "Device not found");
	48	if (!S_ISLNK(statbuf.st_mode))
	49	snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s/device", dev);
e33dcf90	50	count = readlink(file_name, file_name, sizeof(file_name));
dc422c04 UH	51	if (count <= 0 \|\| count >= (int)(sizeof(file_name) - 1))
dc422c04 UH	52	RETURN_ERROR(SP_ERR_ARG, "Device not found");
e33dcf90 ML	53	file_name[count] = 0;
	54	if (strstr(file_name, "bluetooth"))
	55	port->transport = SP_TRANSPORT_BLUETOOTH;
	56	else if (strstr(file_name, "usb"))
	57	port->transport = SP_TRANSPORT_USB;
	58
	59	if (port->transport == SP_TRANSPORT_USB) {
dc422c04	60	for (i = 0; i < 5; i++) {
e33dcf90 ML	61	strcat(sub_dir, "../");
	62
	63	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum");
	64	if (!(file = fopen(file_name, "r")))
	65	continue;
	66	count = fscanf(file, "%d", &bus);
	67	fclose(file);
	68	if (count != 1)
	69	continue;
	70
	71	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum");
	72	if (!(file = fopen(file_name, "r")))
	73	continue;
	74	count = fscanf(file, "%d", &address);
	75	fclose(file);
	76	if (count != 1)
	77	continue;
	78
	79	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor");
	80	if (!(file = fopen(file_name, "r")))
	81	continue;
	82	count = fscanf(file, "%4x", &vid);
	83	fclose(file);
	84	if (count != 1)
	85	continue;
	86
	87	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct");
	88	if (!(file = fopen(file_name, "r")))
	89	continue;
	90	count = fscanf(file, "%4x", &pid);
	91	fclose(file);
	92	if (count != 1)
	93	continue;
	94
	95	port->usb_bus = bus;
	96	port->usb_address = address;
	97	port->usb_vid = vid;
	98	port->usb_pid = pid;
	99
	100	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
	101	if ((file = fopen(file_name, "r"))) {
	102	if ((ptr = fgets(description, sizeof(description), file))) {
	103	ptr = description + strlen(description) - 1;
	104	if (ptr >= description && *ptr == '\n')
	105	*ptr = 0;
	106	port->description = strdup(description);
	107	}
	108	fclose(file);
	109	}
	110	if (!file \|\| !ptr)
	111	port->description = strdup(dev);
	112
	113	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer");
	114	if ((file = fopen(file_name, "r"))) {
	115	if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) {
	116	ptr = manufacturer + strlen(manufacturer) - 1;
	117	if (ptr >= manufacturer && *ptr == '\n')
	118	*ptr = 0;
	119	port->usb_manufacturer = strdup(manufacturer);
	120	}
	121	fclose(file);
	122	}
	123
	124	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
125	if ((file = fopen(file_name, "r"))) {
126	if ((ptr = fgets(product, sizeof(product), file))) {
127	ptr = product + strlen(product) - 1;
128	if (ptr >= product && *ptr == '\n')
129	*ptr = 0;
130	port->usb_product = strdup(product);
131	}
132	fclose(file);
133	}
134
135	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial");
136	if ((file = fopen(file_name, "r"))) {
137	if ((ptr = fgets(serial, sizeof(serial), file))) {
138	ptr = serial + strlen(serial) - 1;
139	if (ptr >= serial && *ptr == '\n')
140	*ptr = 0;
141	port->usb_serial = strdup(serial);
142	}
143	fclose(file);
144	}
145
ea17bfca UJ	146	/* If present, add serial to description for better identification. */
ea17bfca UJ	147	if (port->usb_serial && strlen(port->usb_serial)) {
7c1101dc	148	snprintf(description, sizeof(description),
ea17bfca UJ	149	"%s - %s", port->description, port->usb_serial);
	150	if (port->description)
	151	free(port->description);
	152	port->description = strdup(description);
	153	}
	154
e33dcf90 ML	155	break;
	156	}
	157	} else {
	158	port->description = strdup(dev);
	159
	160	if (port->transport == SP_TRANSPORT_BLUETOOTH) {
	161	snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address");
	162	if ((file = fopen(file_name, "r"))) {
	163	if ((ptr = fgets(baddr, sizeof(baddr), file))) {
	164	ptr = baddr + strlen(baddr) - 1;
	165	if (ptr >= baddr && *ptr == '\n')
	166	*ptr = 0;
	167	port->bluetooth_address = strdup(baddr);
	168	}
	169	fclose(file);
	170	}
	171	}
	172	}
	173
	174	RETURN_OK();
	175	}
48a4076f	176
970f279a	177	SP_PRIV enum sp_return list_ports(struct sp_port ***list)
48a4076f AJ	178	{
	179	char name[PATH_MAX], target[PATH_MAX];
	180	struct dirent entry, *result;
f1c916ed	181	#ifdef HAVE_STRUCT_SERIAL_STRUCT
48a4076f	182	struct serial_struct serial_info;
12056e2f MC	183	int ioctl_result;
12056e2f MC	184	#endif
46d8b0a0	185	char buf[sizeof(entry.d_name) + 23];
12056e2f	186	int len, fd;
48a4076f AJ	187	DIR *dir;
48a4076f AJ	188	int ret = SP_OK;
46d8b0a0	189	struct stat statbuf;
48a4076f AJ	190
	191	DEBUG("Enumerating tty devices");
	192	if (!(dir = opendir("/sys/class/tty")))
dc422c04	193	RETURN_FAIL("Could not open /sys/class/tty");
48a4076f AJ	194
	195	DEBUG("Iterating over results");
	196	while (!readdir_r(dir, &entry, &result) && result) {
5bd33b7c	197	snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name);
46d8b0a0	198	if (lstat(buf, &statbuf) == -1)
	199	continue;
	200	if (!S_ISLNK(statbuf.st_mode))
	201	snprintf(buf, sizeof(buf), "/sys/class/tty/%s/device", entry.d_name);
5bd33b7c	202	len = readlink(buf, target, sizeof(target));
dc422c04	203	if (len <= 0 \|\| len >= (int)(sizeof(target) - 1))
48a4076f AJ	204	continue;
	205	target[len] = 0;
	206	if (strstr(target, "virtual"))
	207	continue;
	208	snprintf(name, sizeof(name), "/dev/%s", entry.d_name);
7890cef6	209	DEBUG_FMT("Found device %s", name);
48a4076f	210	if (strstr(target, "serial8250")) {
dc422c04 UH	211	/*
dc422c04 UH	212	* The serial8250 driver has a hardcoded number of ports.
48a4076f	213	* The only way to tell which actually exist on a given system
dc422c04 UH	214	* is to try to open them and make an ioctl call.
dc422c04 UH	215	*/
48a4076f AJ	216	DEBUG("serial8250 device, attempting to open");
48a4076f AJ	217	if ((fd = open(name, O_RDWR \| O_NONBLOCK \| O_NOCTTY)) < 0) {
dc422c04	218	DEBUG("Open failed, skipping");
48a4076f AJ	219	continue;
48a4076f AJ	220	}
f1c916ed	221	#ifdef HAVE_STRUCT_SERIAL_STRUCT
48a4076f	222	ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
12056e2f	223	#endif
48a4076f	224	close(fd);
f1c916ed	225	#ifdef HAVE_STRUCT_SERIAL_STRUCT
48a4076f AJ	226	if (ioctl_result != 0) {
	227	DEBUG("ioctl failed, skipping");
	228	continue;
	229	}
	230	if (serial_info.type == PORT_UNKNOWN) {
dc422c04	231	DEBUG("Port type is unknown, skipping");
48a4076f AJ	232	continue;
48a4076f AJ	233	}
12056e2f	234	#endif
48a4076f	235	}
7890cef6	236	DEBUG_FMT("Found port %s", name);
48a4076f AJ	237	list = list_append(list, name);
48a4076f AJ	238	if (!list) {
dc422c04	239	SET_ERROR(ret, SP_ERR_MEM, "List append failed");
48a4076f AJ	240	break;
	241	}
	242	}
	243	closedir(dir);
	244
	245	return ret;
	246	}