usb/net/asix_devices: Add USBNET HG20F9 ethernet dongle

This USB ethernet adapter was purchased in anodyne packaging
from the computer store adjacent to linux.conf.au 2013 in
Canberra (Australia). A web search shows other recent
purchasers in Lancaster (UK) and Seattle (USA). Just like an
emergent virus, our age of e-commerce and airmail allows
underdocumented hardware to spread around the world instantly
using the vector of ridiculously low prices.

Paige Thompson, infected via eBay, discovered that the HG20F9
is a copy of the Asix 88772B; many viruses copy the RNA of
other viruses. See Paige's work at
<https://github.com/paigeadele/HG20F9>.
This patch uses her discovery to update the restructured Asix
driver in the current kernel.

Just as some viruses inhabit seemingly-healthy cells, the
HG20F9 uses the Vendor ID 0x066b assigned to Linksys Inc.
For the present there is no clash of Product ID 0x20f9.

Signed-off-by: Glen Turner <gdt@gdt.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 2205dbc8d32f..709753469099 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -924,6 +924,29 @@ static const struct driver_info ax88178_info = {
         .tx_fixup = asix_tx_fixup,
 };
 
+/*
+ * USBLINK 20F9 "USB 2.0 LAN" USB ethernet adapter, typically found in
+ * no-name packaging.
+ * USB device strings are:
+ *   1: Manufacturer: USBLINK
+ *   2: Product: HG20F9 USB2.0
+ *   3: Serial: 000003
+ * Appears to be compatible with Asix 88772B.
+ */
+static const struct driver_info hg20f9_info = {
+        .description = "HG20F9 USB 2.0 Ethernet",
+        .bind = ax88772_bind,
+        .unbind = ax88772_unbind,
+        .status = asix_status,
+        .link_reset = ax88772_link_reset,
+        .reset = ax88772_reset,
+        .flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
+                 FLAG_MULTI_PACKET,
+        .rx_fixup = asix_rx_fixup_common,
+        .tx_fixup = asix_tx_fixup,
+        .data = FLAG_EEPROM_MAC,
+};
+
 extern const struct driver_info ax88172a_info;
 
 static const struct usb_device_id       products [] = {
@@ -1063,6 +1086,14 @@ static const struct usb_device_id	products [] = {
         /* ASIX 88172a demo board */
         USB_DEVICE(0x0b95, 0x172a),
         .driver_info = (unsigned long) &ax88172a_info,
+}, {
+        /*
+         * USBLINK HG20F9 "USB 2.0 LAN"
+         * Appears to have gazumped Linksys's manufacturer ID but
+         * doesn't (yet) conflict with any known Linksys product.
+         */
+        USB_DEVICE(0x066b, 0x20f9),
+        .driver_info = (unsigned long) &hg20f9_info,
 },
         { },            // END
 };