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Report USB device disconnection when detected

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USB device disconnection is detected via a hotplug callback when it is
supported.

In addition, report disconnection on libusb calls returning
LIBUSB_ERROR_NO_DEVICE or LIBUSB_ERROR_NOT_FOUND. This allows to detect
disconnection after a libusb call when hotplug is not available.

PR #3011 <https://github.com/Genymobile/scrcpy/pull/3011>
This commit is contained in:
Romain Vimont
2022-02-10 07:57:18 +01:00
parent 3ee3f8dc02
commit be1936bb85
3 changed files with 30 additions and 2 deletions
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22
app/src/usb/usb.c
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@@ -216,6 +216,24 @@ sc_usb_destroy(struct sc_usb *usb) {
libusb_exit(usb->context);
}
static void
sc_usb_report_disconnected(struct sc_usb *usb) {
if (usb->cbs && !atomic_flag_test_and_set(&usb->disconnection_notified)) {
assert(usb->cbs && usb->cbs->on_disconnected);
usb->cbs->on_disconnected(usb, usb->cbs_userdata);
}
}
bool
sc_usb_check_disconnected(struct sc_usb *usb, int result) {
if (result == LIBUSB_ERROR_NO_DEVICE || result == LIBUSB_ERROR_NOT_FOUND) {
sc_usb_report_disconnected(usb);
return false;
}
return true;
}
static int
sc_usb_libusb_callback(libusb_context *ctx, libusb_device *device,
libusb_hotplug_event event, void *userdata) {
@@ -232,8 +250,7 @@ sc_usb_libusb_callback(libusb_context *ctx, libusb_device *device,
return 0;
}
assert(usb->cbs && usb->cbs->on_disconnected);
usb->cbs->on_disconnected(usb, usb->cbs_userdata);
sc_usb_report_disconnected(usb);
// Do not automatically deregister the callback by returning 1. Instead,
// manually deregister to interrupt libusb_handle_events() from the libusb
@@ -307,6 +324,7 @@ sc_usb_connect(struct sc_usb *usb, libusb_device *device,
if (cbs) {
atomic_init(&usb->stopped, false);
usb->disconnection_notified = (atomic_flag) ATOMIC_FLAG_INIT;
if (sc_usb_register_callback(usb)) {
// Create a thread to process libusb events, so that device
// disconnection could be detected immediately