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 }