Add USB host ethernet adapter support
This adds support for using USB Ethernet dongles in host mode. This is just the framework - drivers will come later. A new config option called CONFIG_USB_HOST_ETHER can be defined in board config files to switch this on. The was originally written by NVIDIA and was cleaned up for release by the Chromium authors. Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
Remy Bohmer
45
drivers/usb/eth/Makefile
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45
drivers/usb/eth/Makefile
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#
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# Copyright (c) 2011 The Chromium OS Authors.
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include $(TOPDIR)/config.mk
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LIB := $(obj)libusb_eth.a
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# new USB host ethernet layer dependencies
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COBJS-$(CONFIG_USB_HOST_ETHER) += usb_ether.o
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COBJS := $(COBJS-y)
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SRCS := $(COBJS:.o=.c)
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OBJS := $(addprefix $(obj),$(COBJS))
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all: $(LIB)
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$(LIB): $(obj).depend $(OBJS)
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$(AR) $(ARFLAGS) $@ $(OBJS)
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#########################################################################
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk
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sinclude $(obj).depend
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#########################################################################
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143
drivers/usb/eth/usb_ether.c
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143
drivers/usb/eth/usb_ether.c
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <usb.h>
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#include "usb_ether.h"
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typedef void (*usb_eth_before_probe)(void);
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typedef int (*usb_eth_probe)(struct usb_device *dev, unsigned int ifnum,
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struct ueth_data *ss);
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typedef int (*usb_eth_get_info)(struct usb_device *dev, struct ueth_data *ss,
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struct eth_device *dev_desc);
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struct usb_eth_prob_dev {
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usb_eth_before_probe before_probe; /* optional */
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usb_eth_probe probe;
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usb_eth_get_info get_info;
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};
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/* driver functions go here, each bracketed by #ifdef CONFIG_USB_ETHER_xxx */
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static const struct usb_eth_prob_dev prob_dev[] = {
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{ }, /* END */
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};
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static int usb_max_eth_dev; /* number of highest available usb eth device */
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static struct ueth_data usb_eth[USB_MAX_ETH_DEV];
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/*******************************************************************************
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* tell if current ethernet device is a usb dongle
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*/
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int is_eth_dev_on_usb_host(void)
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{
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int i;
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struct eth_device *dev = eth_get_dev();
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if (dev) {
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for (i = 0; i < usb_max_eth_dev; i++)
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if (&usb_eth[i].eth_dev == dev)
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return 1;
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}
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return 0;
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}
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/*
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* Given a USB device, ask each driver if it can support it, and attach it
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* to the first driver that says 'yes'
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*/
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static void probe_valid_drivers(struct usb_device *dev)
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{
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int j;
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for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) {
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if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev]))
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continue;
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/*
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* ok, it is a supported eth device. Get info and fill it in
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*/
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if (prob_dev[j].get_info(dev,
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&usb_eth[usb_max_eth_dev],
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&usb_eth[usb_max_eth_dev].eth_dev)) {
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/* found proper driver */
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/* register with networking stack */
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usb_max_eth_dev++;
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/*
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* usb_max_eth_dev must be incremented prior to this
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* call since eth_current_changed (internally called)
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* relies on it
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*/
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eth_register(&usb_eth[usb_max_eth_dev - 1].eth_dev);
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break;
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}
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}
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}
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/*******************************************************************************
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* scan the usb and reports device info
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* to the user if mode = 1
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* returns current device or -1 if no
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*/
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int usb_host_eth_scan(int mode)
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{
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int i, old_async;
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struct usb_device *dev;
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if (mode == 1)
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printf(" scanning bus for ethernet devices... ");
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old_async = usb_disable_asynch(1); /* asynch transfer not allowed */
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for (i = 0; i < USB_MAX_ETH_DEV; i++)
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memset(&usb_eth[i], 0, sizeof(usb_eth[i]));
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for (i = 0; prob_dev[i].probe; i++) {
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if (prob_dev[i].before_probe)
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prob_dev[i].before_probe();
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}
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usb_max_eth_dev = 0;
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for (i = 0; i < USB_MAX_DEVICE; i++) {
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dev = usb_get_dev_index(i); /* get device */
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debug("i=%d\n", i);
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if (dev == NULL)
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break; /* no more devices avaiable */
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/* find valid usb_ether driver for this device, if any */
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probe_valid_drivers(dev);
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/* check limit */
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if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
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printf("max USB Ethernet Device reached: %d stopping\n",
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usb_max_eth_dev);
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break;
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}
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} /* for */
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usb_disable_asynch(old_async); /* restore asynch value */
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printf("%d Ethernet Device(s) found\n", usb_max_eth_dev);
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if (usb_max_eth_dev > 0)
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return 0;
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return -1;
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}
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