USB: serial: mos7840: add USB ID to support Moxa UPort 2210

Add USB ID for MOXA UPort 2210. This device contains mos7820 but
it passes GPIO0 check implemented by driver and it's detected as
mos7840. Hence product id check is added to force mos7820 mode.

Signed-off-by: Pavel Löbl <pavel@loebl.cz>
Cc: stable <stable@vger.kernel.org>
[ johan: rename id defines and add vendor-id check ]
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index a698d46ba773a2c8be6a17be6abb2a7b94f291e9..3eeeee38debc543c753206a59a3a970b484f3a2a 100644 (file)
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -119,11 +119,15 @@
 /* This driver also supports
  * ATEN UC2324 device using Moschip MCS7840
  * ATEN UC2322 device using Moschip MCS7820
+ * MOXA UPort 2210 device using Moschip MCS7820
  */
 #define USB_VENDOR_ID_ATENINTL         0x0557
 #define ATENINTL_DEVICE_ID_UC2324      0x2011
 #define ATENINTL_DEVICE_ID_UC2322      0x7820
 
+#define USB_VENDOR_ID_MOXA             0x110a
+#define MOXA_DEVICE_ID_2210            0x2210
+
 /* Interrupt Routine Defines    */
 
 #define SERIAL_IIR_RLS      0x06
@@ -195,6 +199,7 @@ static const struct usb_device_id id_table[] = {
        {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
        {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
        {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
+       {USB_DEVICE(USB_VENDOR_ID_MOXA, MOXA_DEVICE_ID_2210)},
        {}                      /* terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, id_table);
@@ -2020,6 +2025,7 @@ static int mos7840_probe(struct usb_serial *serial,
                                const struct usb_device_id *id)
 {
        u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
+       u16 vid = le16_to_cpu(serial->dev->descriptor.idVendor);
        u8 *buf;
        int device_type;
 
@@ -2030,6 +2036,11 @@ static int mos7840_probe(struct usb_serial *serial,
                goto out;
        }
 
+       if (vid == USB_VENDOR_ID_MOXA && product == MOXA_DEVICE_ID_2210) {
+               device_type = MOSCHIP_DEVICE_ID_7820;
+               goto out;
+       }
+
        buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;