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genode_c_api: delay USB service announcement

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Ref #4294
This commit is contained in:
Stefan Kalkowski 2021-10-11 11:23:57 +02:00 committed by Norman Feske
parent 873eb687b0
commit b7a379546e
1 changed files with 27 additions and 4 deletions
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31
repos/os/src/lib/genode_c_api/usb.cc
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@ -140,6 +140,8 @@ class Root : public Root_component<genode_usb_session>
Env & _env;
Signal_context_capability _sigh_cap;
Attached_rom_dataspace _config { _env, "config" };
Signal_handler<Root> _config_handler { _env.ep(), *this,
&Root::_announce_service };
Reporter _reporter { _env, "devices" };
Constructible<Device> _devices[MAX_DEVICES];
List<List_element<genode_usb_session>> _sessions {};
@ -180,6 +182,8 @@ class Root : public Root_component<genode_usb_session>
*/
bool _matches(Device & d, genode_usb_session & s);
void _announce_service();
public:
Root(Env & env, Allocator & alloc, Signal_context_capability);
@ -546,6 +550,27 @@ void ::Root::_report()
}
void ::Root::_announce_service()
{
/*
* Defer the startup of the USB driver until the first configuration
* becomes available. This is needed in scenarios where the configuration
* is dynamically generated and supplied to the USB driver via the
* report-ROM service.
*/
_config.update();
if (_announced)
return;
if (_config.xml().type() == "config") {
log(_config.xml());
_env.parent().announce(_env.ep().manage(*this));
_announced = true;
}
}
void ::Root::announce_device(unsigned long vendor,
unsigned long product,
unsigned long cla,
@ -557,10 +582,7 @@ void ::Root::announce_device(unsigned long vendor,
continue;
_devices[idx].construct(vendor, product, cla, bus, dev);
if (!_announced) {
_env.parent().announce(_env.ep().manage(*this));
_announced = true;
}
_announce_service();
_report();
_for_each_session([&] (genode_usb_session & s) {
@ -637,6 +659,7 @@ bool ::Root::device_associated(genode_usb_session * session,
{
/* Reserve id zero which is invalid */
_id_alloc.alloc();
_config.sigh(_config_handler);
}