Fixes the PCI-port bug on Raspberry Pi 4 (#113)

* Fixes the PCI-port bug on Raspberry Pi 4

The Bug is caused by the Fact that the USB controller is connected to
the CPU via PCI, which was not the case on the Raspberry Pi 3.
Because of this, the BUS_ID reported by libudev is PCI. However, if it
is an actual USB device, there will be fields containing the neccessary
information to generate a UsbPortInfo. This patch checks whether all
those fields are available, if the BUS_ID is Pci, and if so uses them to
populate an UsbPortInfo and return a SerialPortType::UsbPort

* removes some logging code I accidentally left in there

* fixes mistake in feature gated code

* updates Changelog

* oops

CHANGELOG.md

@@ -9,6 +9,9 @@ project adheres to [Semantic Versioning](https://semver.org/).
 ### Added
 ### Changed
 ### Fixed
+* Fixes a bug on the Raspberry Pi 4, which results in USB-devices being detected as PCI-devices.
+  [#113](https://github.com/serialport/serialport-rs/pull/113)
+
 ### Removed
 
 ## [4.2.1] - 2023-05-21

src/posix/enumerate.rs

@@ -87,7 +87,35 @@ fn port_type(d: &libudev::Device) -> Result<SerialPortType> {
                     .ok(),
             }))
         }
-        Some("pci") => Ok(SerialPortType::PciPort),
+        Some("pci") => {
+            let usb_properties = vec![
+                d.property_value("ID_USB_VENDOR_ID"),
+                d.property_value("ID_USB_MODEL_ID"),
+                d.property_value("ID_USB_VENDOR"),
+                d.property_value("ID_USB_MODEL"),
+                d.property_value("ID_USB_SERIAL_SHORT"),
+            ]
+            .into_iter()
+            .collect::<Option<Vec<_>>>();
+            if usb_properties.is_some() {
+                Ok(SerialPortType::UsbPort(UsbPortInfo {
+                    vid: udev_hex_property_as_int(d, "ID_USB_VENDOR_ID", &u16::from_str_radix)?,
+                    pid: udev_hex_property_as_int(d, "ID_USB_MODEL_ID", &u16::from_str_radix)?,
+                    serial_number: udev_property_as_string(d, "ID_USB_SERIAL_SHORT"),
+                    manufacturer: udev_property_as_string(d, "ID_USB_VENDOR"),
+                    product: udev_property_as_string(d, "ID_USB_MODEL"),
+                    #[cfg(feature = "usbportinfo-interface")]
+                    interface: udev_hex_property_as_int(
+                        d,
+                        "ID_USB_INTERFACE_NUM",
+                        &u8::from_str_radix,
+                    )
+                    .ok(),
+                }))
+            } else {
+                Ok(SerialPortType::PciPort)
+            }
+        }
         _ => Ok(SerialPortType::Unknown),
     }
 }