[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);
			}

			/* 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) + 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	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;
	39
	40	if (strncmp(port->name, "/dev/", 5))
dc422c04	41	RETURN_ERROR(SP_ERR_ARG, "Device name not recognized");
e33dcf90 ML	42
	43	snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev);
	44	count = readlink(file_name, file_name, sizeof(file_name));
dc422c04 UH	45	if (count <= 0 \|\| count >= (int)(sizeof(file_name) - 1))
dc422c04 UH	46	RETURN_ERROR(SP_ERR_ARG, "Device not found");
e33dcf90 ML	47	file_name[count] = 0;
	48	if (strstr(file_name, "bluetooth"))
	49	port->transport = SP_TRANSPORT_BLUETOOTH;
	50	else if (strstr(file_name, "usb"))
	51	port->transport = SP_TRANSPORT_USB;
	52
	53	if (port->transport == SP_TRANSPORT_USB) {
dc422c04	54	for (i = 0; i < 5; i++) {
e33dcf90 ML	55	strcat(sub_dir, "../");
	56
	57	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum");
	58	if (!(file = fopen(file_name, "r")))
	59	continue;
	60	count = fscanf(file, "%d", &bus);
	61	fclose(file);
	62	if (count != 1)
	63	continue;
	64
	65	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum");
	66	if (!(file = fopen(file_name, "r")))
	67	continue;
	68	count = fscanf(file, "%d", &address);
	69	fclose(file);
	70	if (count != 1)
	71	continue;
	72
	73	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor");
	74	if (!(file = fopen(file_name, "r")))
	75	continue;
	76	count = fscanf(file, "%4x", &vid);
	77	fclose(file);
	78	if (count != 1)
	79	continue;
	80
	81	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct");
	82	if (!(file = fopen(file_name, "r")))
	83	continue;
	84	count = fscanf(file, "%4x", &pid);
	85	fclose(file);
	86	if (count != 1)
	87	continue;
	88
	89	port->usb_bus = bus;
	90	port->usb_address = address;
	91	port->usb_vid = vid;
	92	port->usb_pid = pid;
	93
	94	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
	95	if ((file = fopen(file_name, "r"))) {
	96	if ((ptr = fgets(description, sizeof(description), file))) {
	97	ptr = description + strlen(description) - 1;
	98	if (ptr >= description && *ptr == '\n')
	99	*ptr = 0;
	100	port->description = strdup(description);
	101	}
	102	fclose(file);
	103	}
	104	if (!file \|\| !ptr)
	105	port->description = strdup(dev);
	106
	107	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer");
	108	if ((file = fopen(file_name, "r"))) {
	109	if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) {
	110	ptr = manufacturer + strlen(manufacturer) - 1;
	111	if (ptr >= manufacturer && *ptr == '\n')
	112	*ptr = 0;
	113	port->usb_manufacturer = strdup(manufacturer);
	114	}
	115	fclose(file);
	116	}
	117
	118	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
119	if ((file = fopen(file_name, "r"))) {
120	if ((ptr = fgets(product, sizeof(product), file))) {
121	ptr = product + strlen(product) - 1;
122	if (ptr >= product && *ptr == '\n')
123	*ptr = 0;
124	port->usb_product = strdup(product);
125	}
126	fclose(file);
127	}
128
129	snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial");
130	if ((file = fopen(file_name, "r"))) {
131	if ((ptr = fgets(serial, sizeof(serial), file))) {
132	ptr = serial + strlen(serial) - 1;
133	if (ptr >= serial && *ptr == '\n')
134	*ptr = 0;
135	port->usb_serial = strdup(serial);
136	}
137	fclose(file);
138	}
139
ea17bfca UJ	140	/* If present, add serial to description for better identification. */
ea17bfca UJ	141	if (port->usb_serial && strlen(port->usb_serial)) {
7c1101dc	142	snprintf(description, sizeof(description),
ea17bfca UJ	143	"%s - %s", port->description, port->usb_serial);
	144	if (port->description)
	145	free(port->description);
	146	port->description = strdup(description);
	147	}
	148
e33dcf90 ML	149	break;
	150	}
	151	} else {
	152	port->description = strdup(dev);
	153
	154	if (port->transport == SP_TRANSPORT_BLUETOOTH) {
	155	snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address");
	156	if ((file = fopen(file_name, "r"))) {
	157	if ((ptr = fgets(baddr, sizeof(baddr), file))) {
	158	ptr = baddr + strlen(baddr) - 1;
	159	if (ptr >= baddr && *ptr == '\n')
	160	*ptr = 0;
	161	port->bluetooth_address = strdup(baddr);
	162	}
	163	fclose(file);
	164	}
	165	}
	166	}
	167
	168	RETURN_OK();
	169	}
48a4076f	170
970f279a	171	SP_PRIV enum sp_return list_ports(struct sp_port ***list)
48a4076f AJ	172	{
	173	char name[PATH_MAX], target[PATH_MAX];
	174	struct dirent entry, *result;
12056e2f	175	#ifdef HAVE_SERIAL_STRUCT
48a4076f	176	struct serial_struct serial_info;
12056e2f MC	177	int ioctl_result;
12056e2f MC	178	#endif
5bd33b7c	179	char buf[sizeof(entry.d_name) + 16];
12056e2f	180	int len, fd;
48a4076f AJ	181	DIR *dir;
	182	int ret = SP_OK;
	183
	184	DEBUG("Enumerating tty devices");
	185	if (!(dir = opendir("/sys/class/tty")))
dc422c04	186	RETURN_FAIL("Could not open /sys/class/tty");
48a4076f AJ	187
	188	DEBUG("Iterating over results");
	189	while (!readdir_r(dir, &entry, &result) && result) {
5bd33b7c MC	190	snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name);
5bd33b7c MC	191	len = readlink(buf, target, sizeof(target));
dc422c04	192	if (len <= 0 \|\| len >= (int)(sizeof(target) - 1))
48a4076f AJ	193	continue;
	194	target[len] = 0;
	195	if (strstr(target, "virtual"))
	196	continue;
	197	snprintf(name, sizeof(name), "/dev/%s", entry.d_name);
7890cef6	198	DEBUG_FMT("Found device %s", name);
48a4076f	199	if (strstr(target, "serial8250")) {
dc422c04 UH	200	/*
dc422c04 UH	201	* The serial8250 driver has a hardcoded number of ports.
48a4076f	202	* The only way to tell which actually exist on a given system
dc422c04 UH	203	* is to try to open them and make an ioctl call.
dc422c04 UH	204	*/
48a4076f AJ	205	DEBUG("serial8250 device, attempting to open");
48a4076f AJ	206	if ((fd = open(name, O_RDWR \| O_NONBLOCK \| O_NOCTTY)) < 0) {
dc422c04	207	DEBUG("Open failed, skipping");
48a4076f AJ	208	continue;
48a4076f AJ	209	}
12056e2f	210	#ifdef HAVE_SERIAL_STRUCT
48a4076f	211	ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
12056e2f	212	#endif
48a4076f	213	close(fd);
12056e2f	214	#ifdef HAVE_SERIAL_STRUCT
48a4076f AJ	215	if (ioctl_result != 0) {
	216	DEBUG("ioctl failed, skipping");
	217	continue;
	218	}
	219	if (serial_info.type == PORT_UNKNOWN) {
dc422c04	220	DEBUG("Port type is unknown, skipping");
48a4076f AJ	221	continue;
48a4076f AJ	222	}
12056e2f	223	#endif
48a4076f	224	}
7890cef6	225	DEBUG_FMT("Found port %s", name);
48a4076f AJ	226	list = list_append(list, name);
48a4076f AJ	227	if (!list) {
dc422c04	228	SET_ERROR(ret, SP_ERR_MEM, "List append failed");
48a4076f AJ	229	break;
	230	}
	231	}
	232	closedir(dir);
	233
	234	return ret;
	235	}