[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;

	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;
}
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 ML	24	{
	25	/* Description limited to 127 char,
	26	anything longer would not be user friendly anyway */
	27	char description[128];
0666ccc7 ML	28	int bus, address;
0666ccc7 ML	29	unsigned int vid, pid;
e33dcf90 ML	30	char manufacturer[128], product[128], serial[128];
	31	char baddr[32];
	32	const char dir_name[] = "/sys/class/tty/%s/device/%s%s";
	33	char sub_dir[32] = "", file_name[PATH_MAX];
	34	char ptr, dev = port->name + 5;
	35	FILE *file;
	36	int i, count;
	37
	38	if (strncmp(port->name, "/dev/", 5))
7890cef6	39	RETURN_ERROR(SP_ERR_ARG, "Device name not recognized.");
e33dcf90 ML	40
	41	snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev);
	42	count = readlink(file_name, file_name, sizeof(file_name));
	43	if (count <= 0 \|\| count >= (int) sizeof(file_name)-1)
7890cef6	44	RETURN_ERROR(SP_ERR_ARG, "Device not found.");
e33dcf90 ML	45	file_name[count] = 0;
	46	if (strstr(file_name, "bluetooth"))
	47	port->transport = SP_TRANSPORT_BLUETOOTH;
	48	else if (strstr(file_name, "usb"))
	49	port->transport = SP_TRANSPORT_USB;
	50
	51	if (port->transport == SP_TRANSPORT_USB) {
	52	for (i=0; i<5; i++) {
	53	strcat(sub_dir, "../");
	54
	55	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum");
	56	if (!(file = fopen(file_name, "r")))
	57	continue;
	58	count = fscanf(file, "%d", &bus);
	59	fclose(file);
	60	if (count != 1)
	61	continue;
	62
	63	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum");
	64	if (!(file = fopen(file_name, "r")))
	65	continue;
	66	count = fscanf(file, "%d", &address);
	67	fclose(file);
	68	if (count != 1)
	69	continue;
	70
	71	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor");
	72	if (!(file = fopen(file_name, "r")))
	73	continue;
	74	count = fscanf(file, "%4x", &vid);
	75	fclose(file);
	76	if (count != 1)
	77	continue;
	78
	79	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct");
	80	if (!(file = fopen(file_name, "r")))
	81	continue;
	82	count = fscanf(file, "%4x", &pid);
	83	fclose(file);
	84	if (count != 1)
	85	continue;
	86
	87	port->usb_bus = bus;
	88	port->usb_address = address;
	89	port->usb_vid = vid;
	90	port->usb_pid = pid;
	91
	92	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
	93	if ((file = fopen(file_name, "r"))) {
	94	if ((ptr = fgets(description, sizeof(description), file))) {
	95	ptr = description + strlen(description) - 1;
	96	if (ptr >= description && *ptr == '\n')
	97	*ptr = 0;
	98	port->description = strdup(description);
	99	}
	100	fclose(file);
	101	}
	102	if (!file \|\| !ptr)
	103	port->description = strdup(dev);
	104
	105	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer");
	106	if ((file = fopen(file_name, "r"))) {
	107	if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) {
	108	ptr = manufacturer + strlen(manufacturer) - 1;
109	if (ptr >= manufacturer && *ptr == '\n')
110	*ptr = 0;
111	port->usb_manufacturer = strdup(manufacturer);
112	}
113	fclose(file);
114	}
115
116	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
117	if ((file = fopen(file_name, "r"))) {
118	if ((ptr = fgets(product, sizeof(product), file))) {
119	ptr = product + strlen(product) - 1;
120	if (ptr >= product && *ptr == '\n')
121	*ptr = 0;
122	port->usb_product = strdup(product);
123	}
124	fclose(file);
125	}
126
127	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial");
128	if ((file = fopen(file_name, "r"))) {
129	if ((ptr = fgets(serial, sizeof(serial), file))) {
130	ptr = serial + strlen(serial) - 1;
131	if (ptr >= serial && *ptr == '\n')
132	*ptr = 0;
133	port->usb_serial = strdup(serial);
134	}
135	fclose(file);
136	}
137
138	break;
139	}
140	} else {
141	port->description = strdup(dev);
142
143	if (port->transport == SP_TRANSPORT_BLUETOOTH) {
144	snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address");
145	if ((file = fopen(file_name, "r"))) {
146	if ((ptr = fgets(baddr, sizeof(baddr), file))) {
147	ptr = baddr + strlen(baddr) - 1;
148	if (ptr >= baddr && *ptr == '\n')
149	*ptr = 0;
150	port->bluetooth_address = strdup(baddr);
151	}
152	fclose(file);
153	}
154	}
155	}
156
157	RETURN_OK();
158	}
48a4076f	159
970f279a	160	SP_PRIV enum sp_return list_ports(struct sp_port ***list)
48a4076f AJ	161	{
	162	char name[PATH_MAX], target[PATH_MAX];
	163	struct dirent entry, *result;
12056e2f	164	#ifdef HAVE_SERIAL_STRUCT
48a4076f	165	struct serial_struct serial_info;
12056e2f MC	166	int ioctl_result;
12056e2f MC	167	#endif
5bd33b7c	168	char buf[sizeof(entry.d_name) + 16];
12056e2f	169	int len, fd;
48a4076f AJ	170	DIR *dir;
	171	int ret = SP_OK;
	172
	173	DEBUG("Enumerating tty devices");
	174	if (!(dir = opendir("/sys/class/tty")))
	175	RETURN_FAIL("could not open /sys/class/tty");
	176
	177	DEBUG("Iterating over results");
	178	while (!readdir_r(dir, &entry, &result) && result) {
5bd33b7c MC	179	snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name);
5bd33b7c MC	180	len = readlink(buf, target, sizeof(target));
48a4076f AJ	181	if (len <= 0 \|\| len >= (int) sizeof(target)-1)
	182	continue;
	183	target[len] = 0;
	184	if (strstr(target, "virtual"))
	185	continue;
	186	snprintf(name, sizeof(name), "/dev/%s", entry.d_name);
7890cef6	187	DEBUG_FMT("Found device %s", name);
48a4076f AJ	188	if (strstr(target, "serial8250")) {
	189	/* The serial8250 driver has a hardcoded number of ports.
	190	* The only way to tell which actually exist on a given system
	191	* is to try to open them and make an ioctl call. */
	192	DEBUG("serial8250 device, attempting to open");
	193	if ((fd = open(name, O_RDWR \| O_NONBLOCK \| O_NOCTTY)) < 0) {
	194	DEBUG("open failed, skipping");
	195	continue;
	196	}
12056e2f	197	#ifdef HAVE_SERIAL_STRUCT
48a4076f	198	ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
12056e2f	199	#endif
48a4076f	200	close(fd);
12056e2f	201	#ifdef HAVE_SERIAL_STRUCT
48a4076f AJ	202	if (ioctl_result != 0) {
	203	DEBUG("ioctl failed, skipping");
	204	continue;
	205	}
	206	if (serial_info.type == PORT_UNKNOWN) {
	207	DEBUG("port type is unknown, skipping");
	208	continue;
	209	}
12056e2f	210	#endif
48a4076f	211	}
7890cef6	212	DEBUG_FMT("Found port %s", name);
48a4076f AJ	213	list = list_append(list, name);
	214	if (!list) {
	215	SET_ERROR(ret, SP_ERR_MEM, "list append failed");
	216	break;
	217	}
	218	}
	219	closedir(dir);
	220
	221	return ret;
	222	}