[libserialport.git] / linux.c

/*
 * This file is part of the libserialport project.
 *
 * 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_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_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;
}
Commit	Line	Data
e33dcf90 ML	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
970f279a	23	SP_PRIV enum sp_return get_port_details(struct sp_port *port)
e33dcf90	24	{
dc422c04 UH	25	/*
	26	* Description limited to 127 char, anything longer
	27	* would not be user friendly anyway.
	28	*/
e33dcf90	29	char description[128];
0666ccc7 ML	30	int bus, address;
0666ccc7 ML	31	unsigned int vid, pid;
e33dcf90 ML	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;
46d8b0a0	39	struct stat statbuf;
e33dcf90 ML	40
e33dcf90 ML	41	if (strncmp(port->name, "/dev/", 5))
dc422c04	42	RETURN_ERROR(SP_ERR_ARG, "Device name not recognized");
e33dcf90 ML	43
e33dcf90 ML	44	snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev);
46d8b0a0	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);
e33dcf90	49	count = readlink(file_name, file_name, sizeof(file_name));
dc422c04 UH	50	if (count <= 0 \|\| count >= (int)(sizeof(file_name) - 1))
dc422c04 UH	51	RETURN_ERROR(SP_ERR_ARG, "Device not found");
e33dcf90 ML	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) {
dc422c04	59	for (i = 0; i < 5; i++) {
e33dcf90 ML	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
ea17bfca UJ	145	/* If present, add serial to description for better identification. */
ea17bfca UJ	146	if (port->usb_serial && strlen(port->usb_serial)) {
7c1101dc	147	snprintf(description, sizeof(description),
ea17bfca UJ	148	"%s - %s", port->description, port->usb_serial);
	149	if (port->description)
	150	free(port->description);
	151	port->description = strdup(description);
	152	}
	153
e33dcf90 ML	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	}
48a4076f	175
970f279a	176	SP_PRIV enum sp_return list_ports(struct sp_port ***list)
48a4076f AJ	177	{
	178	char name[PATH_MAX], target[PATH_MAX];
	179	struct dirent entry, *result;
12056e2f	180	#ifdef HAVE_SERIAL_STRUCT
48a4076f	181	struct serial_struct serial_info;
12056e2f MC	182	int ioctl_result;
12056e2f MC	183	#endif
46d8b0a0	184	char buf[sizeof(entry.d_name) + 23];
12056e2f	185	int len, fd;
48a4076f AJ	186	DIR *dir;
48a4076f AJ	187	int ret = SP_OK;
46d8b0a0	188	struct stat statbuf;
48a4076f AJ	189
	190	DEBUG("Enumerating tty devices");
	191	if (!(dir = opendir("/sys/class/tty")))
dc422c04	192	RETURN_FAIL("Could not open /sys/class/tty");
48a4076f AJ	193
	194	DEBUG("Iterating over results");
	195	while (!readdir_r(dir, &entry, &result) && result) {
5bd33b7c	196	snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name);
46d8b0a0	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);
5bd33b7c	201	len = readlink(buf, target, sizeof(target));
dc422c04	202	if (len <= 0 \|\| len >= (int)(sizeof(target) - 1))
48a4076f AJ	203	continue;
	204	target[len] = 0;
	205	if (strstr(target, "virtual"))
	206	continue;
	207	snprintf(name, sizeof(name), "/dev/%s", entry.d_name);
7890cef6	208	DEBUG_FMT("Found device %s", name);
48a4076f	209	if (strstr(target, "serial8250")) {
dc422c04 UH	210	/*
dc422c04 UH	211	* The serial8250 driver has a hardcoded number of ports.
48a4076f	212	* The only way to tell which actually exist on a given system
dc422c04 UH	213	* is to try to open them and make an ioctl call.
dc422c04 UH	214	*/
48a4076f AJ	215	DEBUG("serial8250 device, attempting to open");
48a4076f AJ	216	if ((fd = open(name, O_RDWR \| O_NONBLOCK \| O_NOCTTY)) < 0) {
dc422c04	217	DEBUG("Open failed, skipping");
48a4076f AJ	218	continue;
48a4076f AJ	219	}
12056e2f	220	#ifdef HAVE_SERIAL_STRUCT
48a4076f	221	ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
12056e2f	222	#endif
48a4076f	223	close(fd);
12056e2f	224	#ifdef HAVE_SERIAL_STRUCT
48a4076f AJ	225	if (ioctl_result != 0) {
	226	DEBUG("ioctl failed, skipping");
	227	continue;
	228	}
	229	if (serial_info.type == PORT_UNKNOWN) {
dc422c04	230	DEBUG("Port type is unknown, skipping");
48a4076f AJ	231	continue;
48a4076f AJ	232	}
12056e2f	233	#endif
48a4076f	234	}
7890cef6	235	DEBUG_FMT("Found port %s", name);
48a4076f AJ	236	list = list_append(list, name);
48a4076f AJ	237	if (!list) {
dc422c04	238	SET_ERROR(ret, SP_ERR_MEM, "List append failed");
48a4076f AJ	239	break;
	240	}
	241	}
	242	closedir(dir);
	243
	244	return ret;
	245	}