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libusb: establish/terminate USB session

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Now, the USB connection is established on backend initialization and
terminated on backend exit triggered by high-level libusb code.

Thanks to Peter for the patch.
This commit is contained in:
Christian Helmuth 2020-10-28 15:56:58 +01:00
parent e339dd542c
commit c93f3a1136
1 changed files with 14 additions and 3 deletions
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17
repos/libports/src/lib/libusb/genode_usb_raw.cc
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@ -211,14 +211,26 @@ struct Usb_device
} }
}; };
static Usb_device *device_instance;
static int genode_init(struct libusb_context* ctx) static int genode_init(struct libusb_context* ctx)
{ {
if (!device_instance) {
device_instance = new (libc_alloc) Usb_device;
} else {
Genode::error("tried to init genode usb context twice");
}
return LIBUSB_SUCCESS; return LIBUSB_SUCCESS;
} }
static void genode_exit(void) { } static void genode_exit(void)
{
if (device_instance) {
destroy(libc_alloc, device_instance);
device_instance = nullptr;
}
}
int genode_get_device_list(struct libusb_context *ctx, int genode_get_device_list(struct libusb_context *ctx,
@ -248,8 +260,7 @@ int genode_get_device_list(struct libusb_context *ctx,
dev->bus_number = busnum; dev->bus_number = busnum;
dev->device_address = devaddr; dev->device_address = devaddr;
/* FIXME: find place to free the allocated memory */ Usb_device *usb_device = device_instance;
Usb_device *usb_device = new (libc_alloc) Usb_device;
*(Usb_device**)dev->os_priv = usb_device; *(Usb_device**)dev->os_priv = usb_device;
switch (usb_device->device_descriptor.speed) { switch (usb_device->device_descriptor.speed) {