device.c

   1 /*
   2  * This file is part of the sigrok-cli project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (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 General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <glib.h>
  22 #include <string.h>
  23 #include "sigrok-cli.h"
  24
  25 static void free_drvopts(struct sr_config *src)
  26 {
  27         g_variant_unref(src->data);
  28         g_free(src);
  29 }
  30
  31 GSList *device_scan(void)
  32 {
  33         struct sr_dev_driver **drivers, *driver;
  34         GSList *drvopts, *devices, *tmpdevs, *l;
  35         int i;
  36
  37         if (opt_drv) {
  38                 /* Caller specified driver. Use it. Only this one. */
  39                 if (!parse_driver(opt_drv, &driver, &drvopts))
  40                         return NULL;
  41                 devices = sr_driver_scan(driver, drvopts);
  42                 g_slist_free_full(drvopts, (GDestroyNotify)free_drvopts);
  43         } else if (opt_dont_scan) {
  44                 /* No -d choice, and -D "don't scan" requested. Do nothing. */
  45                 devices = NULL;
  46         } else {
  47                 /* No driver specified. Scan all available drivers. */
  48                 devices = NULL;
  49                 drivers = sr_driver_list(sr_ctx);
  50                 for (i = 0; drivers[i]; i++) {
  51                         driver = drivers[i];
  52                         if (sr_driver_init(sr_ctx, driver) != SR_OK) {
  53                                 g_critical("Failed to initialize driver.");
  54                                 return NULL;
  55                         }
  56                         tmpdevs = sr_driver_scan(driver, NULL);
  57                         for (l = tmpdevs; l; l = l->next)
  58                                 devices = g_slist_append(devices, l->data);
  59                         g_slist_free(tmpdevs);
  60                 }
  61         }
  62
  63         return devices;
  64 }
  65
  66 /**
  67  * Lookup a channel group from its name.
  68  *
  69  * Uses the caller specified channel group name, or a previously stored
  70  * option value as a fallback. Returns a reference to the channel group
  71  * when the lookup succeeded, or #NULL after lookup failure, as well as
  72  * #NULL for the global channel group (the device).
  73  *
  74  * Accepts either #NULL pointer, or an empty string, or the "global"
  75  * literal to address the global channel group (the device). Emits an
  76  * error message when the lookup failed while a name was specified.
  77  *
  78  * @param[in] sdi Device instance.
  79  * @param[in] cg_name Caller provided channel group name.
  80  *
  81  * @returns The channel group, or #NULL for failed lookup.
  82  */
  83 struct sr_channel_group *lookup_channel_group(struct sr_dev_inst *sdi,
  84         const char *cg_name)
  85 {
  86         struct sr_channel_group *cg;
  87         GSList *l, *channel_groups;
  88
  89         if (!cg_name)
  90                 cg_name = opt_channel_group;
  91         if (cg_name && g_ascii_strcasecmp(cg_name, "global") == 0)
  92                 cg_name = NULL;
  93         if (!cg_name || !*cg_name)
  94                 return NULL;
  95
  96         channel_groups = sr_dev_inst_channel_groups_get(sdi);
  97         if (!channel_groups) {
  98                 g_critical("This device does not have any channel groups.");
  99                 return NULL;
 100         }
 101
 102         for (l = channel_groups; l; l = l->next) {
 103                 cg = l->data;
 104                 if (g_ascii_strcasecmp(cg_name, cg->name) != 0)
 105                         continue;
 106                 return cg;
 107         }
 108         g_critical("Invalid channel group '%s'", cg_name);
 109
 110         return NULL;
 111 }