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 "devinst.h"
  23 #include "sigsession.h"
  24
  25 #include <cassert>
  26 #include <stdexcept>
  27 #include <string>
  28
  29 #include <libsigrok/libsigrok.h>
  30
  31 using boost::shared_ptr;
  32 using std::list;
  33 using std::map;
  34 using std::ostringstream;
  35 using std::runtime_error;
  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::DevInst> >& DeviceManager::devices() const
  53 {
  54         return _devices;
  55 }
  56
  57 void DeviceManager::use_device(shared_ptr<DevInst> dev_inst, SigSession *owner)
  58 {
  59         assert(dev_inst);
  60         assert(owner);
  61
  62         _used_devices[dev_inst] = owner;
  63
  64         sr_dev_open(dev_inst->dev_inst());
  65 }
  66
  67 void DeviceManager::release_device(shared_ptr<DevInst> dev_inst)
  68 {
  69         assert(dev_inst);
  70
  71         // Notify the owner, and remove the device from the used device list
  72         map< shared_ptr<DevInst>, pv::SigSession*>::const_iterator iter =
  73                 _used_devices.find(dev_inst);
  74         assert(iter != _used_devices.end());
  75
  76         (*iter).second->release_device(dev_inst);
  77         _used_devices.erase(dev_inst);
  78 }
  79
  80 list< shared_ptr<DevInst> > DeviceManager::driver_scan(
  81         struct sr_dev_driver *const driver, GSList *const drvopts)
  82 {
  83         list< shared_ptr<DevInst> > driver_devices;
  84
  85         assert(driver);
  86
  87         // Remove any device instances from this driver from the device
  88         // list. They will not be valid after the scan.
  89         list< shared_ptr<DevInst> >::iterator i = _devices.begin();
  90         while (i != _devices.end()) {
  91                 if ((*i)->dev_inst()->driver == driver)
  92                         i = _devices.erase(i);
  93                 else
  94                         i++;
  95         }
  96
  97         // Release this driver and all it's attached devices
  98         release_driver(driver);
  99
 100         // Do the scan
 101         GSList *const devices = sr_driver_scan(driver, drvopts);
 102         for (GSList *l = devices; l; l = l->next)
 103                 driver_devices.push_back(shared_ptr<DevInst>(
 104                         new DevInst((sr_dev_inst*)l->data)));
 105         g_slist_free(devices);
 106         driver_devices.sort(compare_devices);
 107
 108         // Add the scanned devices to the main list
 109         _devices.insert(_devices.end(), driver_devices.begin(),
 110                 driver_devices.end());
 111         _devices.sort(compare_devices);
 112
 113         return driver_devices;
 114 }
 115
 116 void DeviceManager::init_drivers()
 117 {
 118         // Initialise all libsigrok drivers
 119         sr_dev_driver **const drivers = sr_driver_list();
 120         for (sr_dev_driver **driver = drivers; *driver; driver++) {
 121                 if (sr_driver_init(_sr_ctx, *driver) != SR_OK) {
 122                         throw runtime_error(
 123                                 string("Failed to initialize driver ") +
 124                                 string((*driver)->name));
 125                 }
 126         }
 127 }
 128
 129 void DeviceManager::release_devices()
 130 {
 131         // Release all the used devices
 132         for (map<shared_ptr<DevInst>, SigSession*>::iterator i =
 133                 _used_devices.begin(); i != _used_devices.end(); i++)
 134                 release_device((*i).first);
 135
 136         _used_devices.clear();
 137
 138         // Clear all the drivers
 139         sr_dev_driver **const drivers = sr_driver_list();
 140         for (sr_dev_driver **driver = drivers; *driver; driver++)
 141                 sr_dev_clear(*driver);
 142 }
 143
 144 void DeviceManager::scan_all_drivers()
 145 {
 146         // Scan all drivers for all devices.
 147         struct sr_dev_driver **const drivers = sr_driver_list();
 148         for (struct sr_dev_driver **driver = drivers; *driver; driver++)
 149                 driver_scan(*driver);
 150 }
 151
 152 void DeviceManager::release_driver(struct sr_dev_driver *const driver)
 153 {
 154         assert(driver);
 155         for (map<shared_ptr<DevInst>, SigSession*>::iterator i =
 156                 _used_devices.begin(); i != _used_devices.end(); i++)
 157                 if((*i).first->dev_inst()->driver == driver)
 158                 {
 159                         // Notify the current owner of the device
 160                         (*i).second->release_device((*i).first);
 161
 162                         // Remove it from the used device list
 163                         _used_devices.erase(i);
 164
 165                         // Close the device instance
 166                         sr_dev_close((*i).first->dev_inst());
 167                 }
 168
 169         // Clear all the old device instances from this driver
 170         sr_dev_clear(driver);
 171 }
 172
 173 bool DeviceManager::compare_devices(shared_ptr<DevInst> a,
 174         shared_ptr<DevInst> b)
 175 {
 176         assert(a);
 177         assert(b);
 178         return a->format_device_title().compare(b->format_device_title()) < 0;
 179 }
 180
 181 } // namespace pv