pv/devicemanager.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2013 Joel Holdsworth <joel@airwebreathe.org.uk>
   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 2 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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include "devicemanager.h"
  22 #include "device/device.h"
  23 #include "sigsession.h"
  24
  25 #include <cassert>
  26 #include <stdexcept>
  27 #include <string>
  28
  29 #include <libsigrok/libsigrok.h>
  30
  31 using std::list;
  32 using std::map;
  33 using std::ostringstream;
  34 using std::runtime_error;
  35 using std::shared_ptr;
  36 using std::string;
  37
  38 namespace pv {
  39
  40 DeviceManager::DeviceManager(struct sr_context *sr_ctx) :
  41         _sr_ctx(sr_ctx)
  42 {
  43         init_drivers();
  44         scan_all_drivers();
  45 }
  46
  47 DeviceManager::~DeviceManager()
  48 {
  49         release_devices();
  50 }
  51
  52 const list< shared_ptr<pv::device::Device> >& DeviceManager::devices() const
  53 {
  54         return _devices;
  55 }
  56
  57 list< shared_ptr<device::Device> > DeviceManager::driver_scan(
  58         struct sr_dev_driver *const driver, GSList *const drvopts)
  59 {
  60         list< shared_ptr<device::Device> > driver_devices;
  61
  62         assert(driver);
  63
  64         // Remove any device instances from this driver from the device
  65         // list. They will not be valid after the scan.
  66         auto i = _devices.begin();
  67         while (i != _devices.end()) {
  68                 if ((*i)->dev_inst()->driver == driver)
  69                         i = _devices.erase(i);
  70                 else
  71                         i++;
  72         }
  73
  74         // Release this driver and all it's attached devices
  75         release_driver(driver);
  76
  77         // Do the scan
  78         GSList *const devices = sr_driver_scan(driver, drvopts);
  79         for (GSList *l = devices; l; l = l->next)
  80                 driver_devices.push_back(shared_ptr<device::Device>(
  81                         new device::Device((sr_dev_inst*)l->data)));
  82         g_slist_free(devices);
  83         driver_devices.sort(compare_devices);
  84
  85         // Add the scanned devices to the main list
  86         _devices.insert(_devices.end(), driver_devices.begin(),
  87                 driver_devices.end());
  88         _devices.sort(compare_devices);
  89
  90         return driver_devices;
  91 }
  92
  93 void DeviceManager::init_drivers()
  94 {
  95         // Initialise all libsigrok drivers
  96         sr_dev_driver **const drivers = sr_driver_list();
  97         for (sr_dev_driver **driver = drivers; *driver; driver++) {
  98                 if (sr_driver_init(_sr_ctx, *driver) != SR_OK) {
  99                         throw runtime_error(
 100                                 string("Failed to initialize driver ") +
 101                                 string((*driver)->name));
 102                 }
 103         }
 104 }
 105
 106 void DeviceManager::release_devices()
 107 {
 108         // Release all the used devices
 109         for (shared_ptr<device::Device> dev : _devices) {
 110                 assert(dev);
 111                 dev->release();
 112         }
 113
 114         // Clear all the drivers
 115         sr_dev_driver **const drivers = sr_driver_list();
 116         for (sr_dev_driver **driver = drivers; *driver; driver++)
 117                 sr_dev_clear(*driver);
 118 }
 119
 120 void DeviceManager::scan_all_drivers()
 121 {
 122         // Scan all drivers for all devices.
 123         struct sr_dev_driver **const drivers = sr_driver_list();
 124         for (struct sr_dev_driver **driver = drivers; *driver; driver++)
 125                 driver_scan(*driver);
 126 }
 127
 128 void DeviceManager::release_driver(struct sr_dev_driver *const driver)
 129 {
 130         for (shared_ptr<device::Device> dev : _devices) {
 131                 assert(dev);
 132                 if(dev->dev_inst()->driver == driver)
 133                         dev->release();
 134         }
 135
 136         // Clear all the old device instances from this driver
 137         sr_dev_clear(driver);
 138 }
 139
 140 bool DeviceManager::compare_devices(shared_ptr<device::Device> a,
 141         shared_ptr<device::Device> b)
 142 {
 143         assert(a);
 144         assert(b);
 145         return a->format_device_title().compare(b->format_device_title()) < 0;
 146 }
 147
 148 } // namespace pv