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 || !gps_fields) {
  56                 blobmsg_add_u8(&b, "signal", 0);
  57         } else {
  58                 blobmsg_add_u32(&b, "age", now.tv_sec - stamp.tv_sec);
  59                 if (gps_fields & GPS_FIELD_LAT)
  60                         blobmsg_add_string(&b, "latitude", latitude);
  61                 if (gps_fields & GPS_FIELD_LON)
  62                         blobmsg_add_string(&b, "longitude", longitude);
  63                 if (gps_fields & GPS_FIELD_ALT)
  64                         blobmsg_add_string(&b, "elevation", elevation);
  65                 if (gps_fields & GPS_FIELD_COG)
  66                         blobmsg_add_string(&b, "course", course);
  67                 if (gps_fields & GPS_FIELD_SPD)
  68                         blobmsg_add_string(&b, "speed", speed);
  69                 if (gps_fields & GPS_FIELD_SAT)
  70                         blobmsg_add_string(&b, "satellites", satellites);
  71                 if (gps_fields & GPS_FIELD_HDP)
  72                         blobmsg_add_string(&b, "HDOP", hdop);
  73         }
  74         ubus_send_reply(ctx, req, b.head);
  75
  76         return UBUS_STATUS_OK;
  77 }
  78
  79 static const struct ubus_method gps_methods[] = {
  80         UBUS_METHOD_NOARG("info", gps_info),
  81 };
  82
  83 static struct ubus_object_type gps_object_type =
  84         UBUS_OBJECT_TYPE("gps", gps_methods);
  85
  86 static struct ubus_object gps_object = {
  87         .name = "gps",
  88         .type = &gps_object_type,
  89         .methods = gps_methods,
  90         .n_methods = ARRAY_SIZE(gps_methods),
  91 };
  92
  93 static void
  94 ubus_connect_handler(struct ubus_context *ctx)
  95 {
  96         int ret;
  97
  98         ret = ubus_add_object(ctx, &gps_object);
  99         if (ret)
 100                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 101 }
 102
 103 static int
 104 usage(const char *prog)
 105 {
 106         fprintf(stderr, "Usage: %s [options] <device>\n"
 107                 "Options:\n"
 108                 "       -a              Adjust system clock from gps\n"
 109                 "       -s <path>       Path to ubus socket\n"
 110                 "       -d <level>      Enable debug messages\n"
 111                 "       -S              Print messages to stdout\n"
 112                 "       -b              Set gps device baud rate\n"
 113                 "\n", prog);
 114         return -1;
 115 }
 116
 117 static speed_t get_baudrate(int baudrate)
 118 {
 119     switch (baudrate) {
 120                 case 4800:
 121                         return B4800;
 122                 case 9600:
 123                         return B9600;
 124                 case 19200:
 125                         return B19200;
 126                 case 38400:
 127                         return B38400;
 128                 case 57600:
 129                         return B57600;
 130                 case 115200:
 131                         return B115200;
 132                 default:
 133                         fprintf(stderr, "ERROR: incorrect baud rate. Default 4800 baud rate has been set\n");
 134                         return B4800;
 135     }
 136 }
 137
 138 int
 139 main(int argc, char ** argv)
 140 {
 141         int ch;
 142         char *device = NULL;
 143         char *dbglvl = getenv("DBGLVL");
 144         int ulog_channels = ULOG_KMSG;
 145         speed_t baudrate = B4800;
 146
 147         signal(SIGPIPE, SIG_IGN);
 148
 149         if (dbglvl) {
 150                 debug = atoi(dbglvl);
 151                 unsetenv("DBGLVL");
 152         }
 153
 154         while ((ch = getopt(argc, argv, "ad:s:Sb:")) != -1) {
 155                 switch (ch) {
 156                 case 'a':
 157                         adjust_clock = -1;
 158                         break;
 159                 case 's':
 160                         ubus_socket = optarg;
 161                         break;
 162                 case 'd':
 163                         debug = atoi(optarg);
 164                         break;
 165                 case 'S':
 166                         ulog_channels = ULOG_STDIO;
 167                         break;
 168                 case 'b':
 169                         baudrate = get_baudrate(atoi(optarg));
 170                         break;
 171                 default:
 172                         return usage(argv[0]);
 173                 }
 174         }
 175
 176         if (argc - optind < 1) {
 177                 fprintf(stderr, "ERROR: missing device parameter\n");
 178                 return usage(argv[0]);
 179         }
 180
 181         device = argv[optind];
 182         ulog_open(ulog_channels, LOG_DAEMON, "ugps");
 183
 184         uloop_init();
 185         conn.path = ubus_socket;
 186         conn.cb = ubus_connect_handler;
 187         ubus_auto_connect(&conn);
 188
 189         if (nmea_open(device, &stream, baudrate) < 0)
 190                 return -1;
 191
 192         uloop_run();
 193         uloop_done();
 194
 195         return 0;
 196 }