diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 165c119..f6ce321 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -71,7 +71,9 @@
 	{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
 	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
 	{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
+	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
+	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
 	{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
 	{ USB_DEVICE( NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID ) },
 	{ }					/* Terminating entry */
diff --git a/drivers/usb/serial/pl2303.h b/drivers/usb/serial/pl2303.h
index 7be9644..21d434d 100644
--- a/drivers/usb/serial/pl2303.h
+++ b/drivers/usb/serial/pl2303.h
@@ -54,7 +54,9 @@
 #define SAMSUNG_PRODUCT_ID	0x8001
 
 #define SIEMENS_VENDOR_ID	0x11f5
+#define SIEMENS_PRODUCT_ID_SX1	0x0001
 #define SIEMENS_PRODUCT_ID_X65	0x0003
+#define SIEMENS_PRODUCT_ID_X75	0x0004
 
 #define SYNTECH_VENDOR_ID	0x0745
 #define SYNTECH_PRODUCT_ID	0x0001