Add support for SMSC95XX USB 2.0 10/100MBit Ethernet Adapter

The SMSC95XX is a USB hub with a built-in Ethernet adapter. This adds support
for this, using the USB host network framework.
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Eric Bénard <eric@eukrea.com>

drivers/usb/eth/Makefile

@@ -28,6 +28,7 @@ COBJS-$(CONFIG_USB_HOST_ETHER) += usb_ether.o
 ifdef CONFIG_USB_ETHER_ASIX
 COBJS-y += asix.o
 endif
+COBJS-$(CONFIG_USB_ETHER_SMSC95XX) += smsc95xx.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

drivers/usb/eth/usb_ether.c

@@ -44,6 +44,13 @@ static const struct usb_eth_prob_dev prob_dev[] = {
 		.probe = asix_eth_probe,
 		.get_info = asix_eth_get_info,
 	},
+#endif
+#ifdef CONFIG_USB_ETHER_SMSC95XX
+	{
+		.before_probe = smsc95xx_eth_before_probe,
+		.probe = smsc95xx_eth_probe,
+		.get_info = smsc95xx_eth_get_info,
+	},
 #endif
 	{ },		/* END */
 };

include/usb_ether.h

@@ -51,6 +51,11 @@ struct ueth_data {
 	unsigned char	irqinterval;	/* Intervall for IRQ Pipe */
 
 	/* private fields for each driver can go here if needed */
+#ifdef CONFIG_USB_ETHER_SMSC95XX
+	size_t rx_urb_size;  /* maximum USB URB size */
+	u32 mac_cr;  /* MAC control register value */
+	int have_hwaddr;  /* 1 if we have a hardware MAC address */
+#endif
 };
 
 /*
@@ -65,4 +70,12 @@ int asix_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
 		      struct eth_device *eth);
 #endif
 
+#ifdef CONFIG_USB_ETHER_SMSC95XX
+void smsc95xx_eth_before_probe(void);
+int smsc95xx_eth_probe(struct usb_device *dev, unsigned int ifnum,
+			struct ueth_data *ss);
+int smsc95xx_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
+			struct eth_device *eth);
+#endif
+
 #endif /* __USB_ETHER_H__ */