dm9601: support dm9620 variant

dm9620 is a newer variant of dm9601 with more features (usb 2.0, checksum
offload, ..), but it can also be put in a dm9601 compatible mode, allowing
us to reuse the existing driver.

This does mean that the extended features like checksum offload cannot be
used, but that's hardly critical on a 100mbps interface.

Thanks to Sławek Wernikowski <slawek@wernikowski.net> for providing me
with a dm9620 based device to test.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 1 deletions

diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c
index 011410f39c90..d7e99445518e 100644
--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -45,6 +45,12 @@
 #define DM_MCAST_ADDR   0x16    /* 8 bytes */
 #define DM_GPR_CTRL     0x1e
 #define DM_GPR_DATA     0x1f
+#define DM_CHIP_ID      0x2c
+#define DM_MODE_CTRL    0x91    /* only on dm9620 */
+
+/* chip id values */
+#define ID_DM9601       0
+#define ID_DM9620       1
 
 #define DM_MAX_MCAST    64
 #define DM_MCAST_SIZE   8
@@ -348,7 +354,7 @@ static const struct net_device_ops dm9601_netdev_ops = {
 static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
 {
         int ret;
-        u8 mac[ETH_ALEN];
+        u8 mac[ETH_ALEN], id;
 
         ret = usbnet_get_endpoints(dev, intf);
         if (ret)
@@ -389,6 +395,24 @@ static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
                 __dm9601_set_mac_address(dev);
         }
 
+        if (dm_read_reg(dev, DM_CHIP_ID, &id) < 0) {
+                netdev_err(dev->net, "Error reading chip ID\n");
+                ret = -ENODEV;
+                goto out;
+        }
+
+        /* put dm9620 devices in dm9601 mode */
+        if (id == ID_DM9620) {
+                u8 mode;
+
+                if (dm_read_reg(dev, DM_MODE_CTRL, &mode) < 0) {
+                        netdev_err(dev->net, "Error reading MODE_CTRL\n");
+                        ret = -ENODEV;
+                        goto out;
+                }
+                dm_write_reg(dev, DM_MODE_CTRL, mode & 0x7f);
+        }
+
         /* power up phy */
         dm_write_reg(dev, DM_GPR_CTRL, 1);
         dm_write_reg(dev, DM_GPR_DATA, 0);
@@ -571,6 +595,10 @@ static const struct usb_device_id products[] = {
          USB_DEVICE(0x0a46, 0x9000),    /* DM9000E */
          .driver_info = (unsigned long)&dm9601_info,
          },
+        {
+         USB_DEVICE(0x0a46, 0x9620),    /* DM9620 USB to Fast Ethernet Adapter */
+         .driver_info = (unsigned long)&dm9601_info,
+         },
         {},                     // END
 };