diff --git a/src/shearwater_common.c b/src/shearwater_common.c
index a7f67f6..2dfb34a 100644
--- a/src/shearwater_common.c
+++ b/src/shearwater_common.c
@@ -548,3 +548,64 @@ shearwater_common_identifier (shearwater_common_device_t *device, dc_buffer_t *b
 
 	return rc;
 }
+
+unsigned int
+shearwater_common_get_model (shearwater_common_device_t *device, unsigned int hardware)
+{
+	unsigned int model = 0;
+
+	switch (hardware) {
+	case 0x0101:
+	case 0x0202:
+		model = PREDATOR;
+		break;
+	case 0x0404:
+	case 0x0909:
+		model = PETREL;
+		break;
+	case 0x0505:
+	case 0x0808:
+	case 0x0838:
+	case 0x08A5:
+	case 0x0B0B:
+	case 0x7828:
+	case 0x7B2C:
+	case 0x8838:
+		model = PETREL2;
+		break;
+	case 0xB407:
+		model = PETREL3;
+		break;
+	case 0x0606:
+	case 0x0A0A:
+		model = NERD;
+		break;
+	case 0x0E0D:
+	case 0x7E2D:
+		model = NERD2;
+		break;
+	case 0x0707:
+		model = PERDIX;
+		break;
+	case 0x0C0D:
+	case 0x7C2D:
+	case 0x8D6C:
+		model = PERDIXAI;
+		break;
+	case 0xC407:
+		model = PERDIX2;
+		break;
+	case 0x0F0F:
+	case 0x1F0A:
+	case 0x1F0F:
+		model = TERIC;
+		break;
+	case 0x1512:
+		model = PEREGRINE;
+		break;
+	default:
+		WARNING (device->base.context, "Unknown hardware type 0x%04x.", hardware);
+	}
+
+	return model;
+}
diff --git a/src/shearwater_common.h b/src/shearwater_common.h
index b1f8c3b..dd6b180 100644
--- a/src/shearwater_common.h
+++ b/src/shearwater_common.h
@@ -67,6 +67,9 @@ shearwater_common_download (shearwater_common_device_t *device, dc_buffer_t *buf
 dc_status_t
 shearwater_common_identifier (shearwater_common_device_t *device, dc_buffer_t *buffer, unsigned int id);
 
+unsigned int
+shearwater_common_get_model (shearwater_common_device_t *device, unsigned int hardware);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/src/shearwater_petrel.c b/src/shearwater_petrel.c
index c047cca..1e32c17 100644
--- a/src/shearwater_petrel.c
+++ b/src/shearwater_petrel.c
@@ -210,59 +210,7 @@ shearwater_petrel_device_foreach (dc_device_t *abstract, dc_dive_callback_t call
 
 	// Convert and map to the model number.
 	unsigned int hardware = array_uint_be (dc_buffer_get_data (buffer), dc_buffer_get_size (buffer));
-	unsigned int model = 0;
-	switch (hardware) {
-	case 0x0101:
-	case 0x0202:
-		model = PREDATOR;
-		break;
-	case 0x0404:
-	case 0x0909:
-		model = PETREL;
-		break;
-	case 0x0505:
-	case 0x0808:
-	case 0x0838:
-	case 0x08A5:
-	case 0x0B0B:
-	case 0x7828:
-	case 0x7B2C:
-	case 0x8838:
-		model = PETREL2;
-		break;
-	case 0xB407:
-		model = PETREL3;
-		break;
-	case 0x0606:
-	case 0x0A0A:
-		model = NERD;
-		break;
-	case 0x0E0D:
-	case 0x7E2D:
-		model = NERD2;
-		break;
-	case 0x0707:
-		model = PERDIX;
-		break;
-	case 0x0C0D:
-	case 0x7C2D:
-	case 0x8D6C:
-		model = PERDIXAI;
-		break;
-	case 0xC407:
-		model = PERDIX2;
-		break;
-	case 0x0F0F:
-	case 0x1F0A:
-	case 0x1F0F:
-		model = TERIC;
-		break;
-	case 0x1512:
-		model = PEREGRINE;
-		break;
-	default:
-		WARNING (abstract->context, "Unknown hardware type %04x.", hardware);
-	}
+	unsigned int model = shearwater_common_get_model (&device->base, hardware);
 
 	// Emit a device info event.
 	dc_event_devinfo_t devinfo;