Add a function to check if the usb devices is still connected.

Submitted by:	Hans Petter Selasky

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/libusb/libusb20_ugen20.c b/lib/libusb/libusb20_ugen20.c
index efcca63a2095..892ba0eb78aa 100644
--- a/lib/libusb/libusb20_ugen20.c
+++ b/lib/libusb/libusb20_ugen20.c
@@ -67,6 +67,7 @@ static libusb20_get_config_index_t ugen20_get_config_index;
 static libusb20_set_config_index_t ugen20_set_config_index;
 static libusb20_set_alt_index_t ugen20_set_alt_index;
 static libusb20_reset_device_t ugen20_reset_device;
+static libusb20_check_connected_t ugen20_check_connected;
 static libusb20_set_power_mode_t ugen20_set_power_mode;
 static libusb20_get_power_mode_t ugen20_get_power_mode;
 static libusb20_kernel_driver_active_t ugen20_kernel_driver_active;
@@ -553,6 +554,25 @@ ugen20_reset_device(struct libusb20_device *pdev)
 }
 
 static int
+ugen20_check_connected(struct libusb20_device *pdev)
+{
+	uint32_t plugtime;
+	int error = 0;
+
+	if (ioctl(pdev->file_ctrl, USB_GET_PLUGTIME, &plugtime)) {
+		error = LIBUSB20_ERROR_NO_DEVICE;
+		goto done;
+	}
+
+	if (pdev->session_data.plugtime != plugtime) {
+		error = LIBUSB20_ERROR_NO_DEVICE;
+		goto done;
+	}
+done:
+	return (error);
+}
+
+static int
 ugen20_set_power_mode(struct libusb20_device *pdev, uint8_t power_mode)
 {
 	int temp;