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Sources/ugps/main.c

  1 /*
  2  *   This program is free software; you can redistribute it and/or modify
  3  *   it under the terms of the GNU General Public License as published by
  4  *   the Free Software Foundation; either version 2 of the License, or
  5  *   (at your option) any later version.
  6  *
  7  *   This program is distributed in the hope that it will be useful,
  8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 10  *   GNU General Public License for more details.
 11  *
 12  *   You should have received a copy of the GNU General Public License
 13  *   along with this program; if not, write to the Free Software
 14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 15  *
 16  *   Copyright (C) 2014 John Crispin <blogic@openwrt.org> 
 17  */
 18 
 19 #include <string.h>
 20 #include <stdint.h>
 21 #include <stdlib.h>
 22 #include <unistd.h>
 23 
 24 #include <libubox/uloop.h>
 25 #include <libubus.h>
 26 
 27 #include "log.h"
 28 #include "nmea.h"
 29 
 30 unsigned int debug;
 31 static struct ustream_fd stream;
 32 static struct ubus_auto_conn conn;
 33 static struct blob_buf b;
 34 static char *ubus_socket;
 35 struct timespec stamp = { 0 };
 36 unsigned int adjust_clock = 0;
 37 
 38 void
 39 gps_timestamp(void)
 40 {
 41         clock_gettime(CLOCK_MONOTONIC, &stamp);
 42 }
 43 
 44 static int
 45 gps_info(struct ubus_context *ctx, struct ubus_object *obj,
 46         struct ubus_request_data *req, const char *method,
 47         struct blob_attr *msg)
 48 {
 49         struct timespec now;
 50 
 51         clock_gettime(CLOCK_MONOTONIC, &now);
 52 
 53         blob_buf_init(&b, 0);
 54 
 55         if (!stamp.tv_sec) {
 56                 blobmsg_add_u8(&b, "signal", 0);
 57         } else {
 58                 blobmsg_add_u32(&b, "age", now.tv_sec - stamp.tv_sec);
 59                 blobmsg_add_string(&b, "latitude", latitude);
 60                 blobmsg_add_string(&b, "longitude", longitude);
 61                 blobmsg_add_string(&b, "elevation", elevation);
 62                 blobmsg_add_string(&b, "course", course);
 63                 blobmsg_add_string(&b, "speed", speed);
 64         }
 65         ubus_send_reply(ctx, req, b.head);
 66 
 67         return UBUS_STATUS_OK;
 68 }
 69 
 70 static const struct ubus_method gps_methods[] = {
 71         UBUS_METHOD_NOARG("info", gps_info),
 72 };
 73 
 74 static struct ubus_object_type gps_object_type =
 75         UBUS_OBJECT_TYPE("gps", gps_methods);
 76 
 77 static struct ubus_object gps_object = {
 78         .name = "gps",
 79         .type = &gps_object_type,
 80         .methods = gps_methods,
 81         .n_methods = ARRAY_SIZE(gps_methods),
 82 };
 83 
 84 static void
 85 ubus_connect_handler(struct ubus_context *ctx)
 86 {
 87         int ret;
 88 
 89         ret = ubus_add_object(ctx, &gps_object);
 90         if (ret)
 91                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 92 }
 93 
 94 static int
 95 usage(const char *prog)
 96 {
 97         fprintf(stderr, "Usage: %s [options] <device>\n"
 98                 "Options:\n"
 99                 "       -a              Adjust system clock from gps\n"
100                 "       -s <path>       Path to ubus socket\n"
101                 "       -d <level>      Enable debug messages\n"
102                 "       -S              Print messages to stdout\n"
103                 "\n", prog);
104         return -1;
105 }
106 
107 int
108 main(int argc, char ** argv)
109 {
110         int ch;
111         char *device = NULL;
112         char *dbglvl = getenv("DBGLVL");
113         int ulog_channels = ULOG_KMSG;
114 
115         signal(SIGPIPE, SIG_IGN);
116 
117         if (dbglvl) {
118                 debug = atoi(dbglvl);
119                 unsetenv("DBGLVL");
120         }
121 
122         while ((ch = getopt(argc, argv, "ad:s:S")) != -1) {
123                 switch (ch) {
124                 case 'a':
125                         adjust_clock = -1;
126                         break;
127                 case 's':
128                         ubus_socket = optarg;
129                         break;
130                 case 'd':
131                         debug = atoi(optarg);
132                         break;
133                 case 'S':
134                         ulog_channels = ULOG_STDIO;
135                         break;
136                 default:
137                         return usage(argv[0]);
138                 }
139         }
140 
141         if (argc - optind < 1) {
142                 fprintf(stderr, "ERROR: missing device parameter\n");
143                 return usage(argv[0]);
144         }
145 
146         device = argv[optind];
147         ulog_open(ulog_channels, LOG_DAEMON, "ugps");
148 
149         uloop_init();
150         conn.path = ubus_socket;
151         conn.cb = ubus_connect_handler;
152         ubus_auto_connect(&conn);
153 
154         if (nmea_open(device, &stream, B4800) < 0)
155                 return -1;
156 
157         uloop_run();
158         uloop_done();
159 
160         return 0;
161 }
162 

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