370 lines
11 KiB
C
370 lines
11 KiB
C
/*
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* Simple "CDC Subset" USB Networking Links
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* Copyright (C) 2000-2005 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/kmod.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/usbnet.h>
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/*
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* This supports simple USB network links that don't require any special
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* framing or hardware control operations. The protocol used here is a
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* strict subset of CDC Ethernet, with three basic differences reflecting
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* the goal that almost any hardware should run it:
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*
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* - Minimal runtime control: one interface, no altsettings, and
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* no vendor or class specific control requests. If a device is
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* configured, it is allowed to exchange packets with the host.
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* Fancier models would mean not working on some hardware.
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*
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* - Minimal manufacturing control: no IEEE "Organizationally
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* Unique ID" required, or an EEPROMs to store one. Each host uses
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* one random "locally assigned" Ethernet address instead, which can
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* of course be overridden using standard tools like "ifconfig".
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* (With 2^46 such addresses, same-net collisions are quite rare.)
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*
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* - There is no additional framing data for USB. Packets are written
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* exactly as in CDC Ethernet, starting with an Ethernet header and
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* terminated by a short packet. However, the host will never send a
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* zero length packet; some systems can't handle those robustly.
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*
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* Anything that can transmit and receive USB bulk packets can implement
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* this protocol. That includes both smart peripherals and quite a lot
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* of "host-to-host" USB cables (which embed two devices back-to-back).
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*
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* Note that although Linux may use many of those host-to-host links
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* with this "cdc_subset" framing, that doesn't mean there may not be a
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* better approach. Handling the "other end unplugs/replugs" scenario
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* well tends to require chip-specific vendor requests. Also, Windows
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* peers at the other end of host-to-host cables may expect their own
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* framing to be used rather than this "cdc_subset" model.
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*/
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#if defined(CONFIG_USB_EPSON2888) || defined(CONFIG_USB_ARMLINUX)
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/* PDA style devices are always connected if present */
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static int always_connected (struct usbnet *dev)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_USB_ALI_M5632
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#define HAVE_HARDWARE
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/*-------------------------------------------------------------------------
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*
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* ALi M5632 driver ... does high speed
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*
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* NOTE that the MS-Windows drivers for this chip use some funky and
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* (naturally) undocumented 7-byte prefix to each packet, so this is a
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* case where we don't currently interoperate. Also, once you unplug
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* one end of the cable, you need to replug the other end too ... since
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* chip docs are unavailable, there's no way to reset the relevant state
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* short of a power cycle.
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*
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*-------------------------------------------------------------------------*/
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static void m5632_recover(struct usbnet *dev)
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{
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struct usb_device *udev = dev->udev;
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struct usb_interface *intf = dev->intf;
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int r;
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r = usb_lock_device_for_reset(udev, intf);
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if (r < 0)
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return;
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usb_reset_device(udev);
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usb_unlock_device(udev);
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}
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static const struct driver_info ali_m5632_info = {
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.description = "ALi M5632",
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.flags = FLAG_POINTTOPOINT,
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.recover = m5632_recover,
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};
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#endif
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#ifdef CONFIG_USB_AN2720
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#define HAVE_HARDWARE
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/*-------------------------------------------------------------------------
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*
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* AnchorChips 2720 driver ... http://www.cypress.com
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*
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* This doesn't seem to have a way to detect whether the peer is
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* connected, or need any reset handshaking. It's got pretty big
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* internal buffers (handles most of a frame's worth of data).
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* Chip data sheets don't describe any vendor control messages.
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*
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*-------------------------------------------------------------------------*/
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static const struct driver_info an2720_info = {
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.description = "AnchorChips/Cypress 2720",
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.flags = FLAG_POINTTOPOINT,
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// no reset available!
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// no check_connect available!
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.in = 2, .out = 2, // direction distinguishes these
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};
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#endif /* CONFIG_USB_AN2720 */
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#ifdef CONFIG_USB_BELKIN
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#define HAVE_HARDWARE
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/*-------------------------------------------------------------------------
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*
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* Belkin F5U104 ... two NetChip 2280 devices + Atmel AVR microcontroller
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*
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* ... also two eTEK designs, including one sold as "Advance USBNET"
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*
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*-------------------------------------------------------------------------*/
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static const struct driver_info belkin_info = {
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.description = "Belkin, eTEK, or compatible",
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.flags = FLAG_POINTTOPOINT,
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};
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#endif /* CONFIG_USB_BELKIN */
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#ifdef CONFIG_USB_EPSON2888
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#define HAVE_HARDWARE
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/*-------------------------------------------------------------------------
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*
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* EPSON USB clients
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*
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* This is the same idea as Linux PDAs (below) except the firmware in the
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* device might not be Tux-powered. Epson provides reference firmware that
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* implements this interface. Product developers can reuse or modify that
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* code, such as by using their own product and vendor codes.
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*
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* Support was from Juro Bystricky <bystricky.juro@erd.epson.com>
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*
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*-------------------------------------------------------------------------*/
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static const struct driver_info epson2888_info = {
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.description = "Epson USB Device",
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.check_connect = always_connected,
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.flags = FLAG_POINTTOPOINT,
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.in = 4, .out = 3,
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};
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#endif /* CONFIG_USB_EPSON2888 */
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/*-------------------------------------------------------------------------
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*
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* info from Jonathan McDowell <noodles@earth.li>
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*
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*-------------------------------------------------------------------------*/
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#ifdef CONFIG_USB_KC2190
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#define HAVE_HARDWARE
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static const struct driver_info kc2190_info = {
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.description = "KC Technology KC-190",
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.flags = FLAG_POINTTOPOINT,
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};
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#endif /* CONFIG_USB_KC2190 */
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#ifdef CONFIG_USB_ARMLINUX
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#define HAVE_HARDWARE
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/*-------------------------------------------------------------------------
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*
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* Intel's SA-1100 chip integrates basic USB support, and is used
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* in PDAs like some iPaqs, the Yopy, some Zaurus models, and more.
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* When they run Linux, arch/arm/mach-sa1100/usb-eth.c may be used to
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* network using minimal USB framing data.
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*
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* This describes the driver currently in standard ARM Linux kernels.
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* The Zaurus uses a different driver (see later).
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*
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* PXA25x and PXA210 use XScale cores (ARM v5TE) with better USB support
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* and different USB endpoint numbering than the SA1100 devices. The
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* mach-pxa/usb-eth.c driver re-uses the device ids from mach-sa1100
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* so we rely on the endpoint descriptors.
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*
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*-------------------------------------------------------------------------*/
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static const struct driver_info linuxdev_info = {
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.description = "Linux Device",
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.check_connect = always_connected,
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.flags = FLAG_POINTTOPOINT,
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};
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static const struct driver_info yopy_info = {
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.description = "Yopy",
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.check_connect = always_connected,
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.flags = FLAG_POINTTOPOINT,
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};
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static const struct driver_info blob_info = {
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.description = "Boot Loader OBject",
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.check_connect = always_connected,
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.flags = FLAG_POINTTOPOINT,
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};
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#endif /* CONFIG_USB_ARMLINUX */
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/*-------------------------------------------------------------------------*/
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#ifndef HAVE_HARDWARE
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#warning You need to configure some hardware for this driver
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#endif
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/*
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* chip vendor names won't normally be on the cables, and
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* may not be on the device.
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*/
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static const struct usb_device_id products [] = {
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#ifdef CONFIG_USB_ALI_M5632
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{
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USB_DEVICE (0x0402, 0x5632), // ALi defaults
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.driver_info = (unsigned long) &ali_m5632_info,
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},
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{
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USB_DEVICE (0x182d,0x207c), // SiteCom CN-124
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.driver_info = (unsigned long) &ali_m5632_info,
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},
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#endif
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#ifdef CONFIG_USB_AN2720
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{
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USB_DEVICE (0x0547, 0x2720), // AnchorChips defaults
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.driver_info = (unsigned long) &an2720_info,
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}, {
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USB_DEVICE (0x0547, 0x2727), // Xircom PGUNET
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.driver_info = (unsigned long) &an2720_info,
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},
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#endif
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#ifdef CONFIG_USB_BELKIN
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{
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USB_DEVICE (0x050d, 0x0004), // Belkin
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.driver_info = (unsigned long) &belkin_info,
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}, {
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USB_DEVICE (0x056c, 0x8100), // eTEK
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.driver_info = (unsigned long) &belkin_info,
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}, {
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USB_DEVICE (0x0525, 0x9901), // Advance USBNET (eTEK)
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.driver_info = (unsigned long) &belkin_info,
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},
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#endif
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#ifdef CONFIG_USB_EPSON2888
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{
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USB_DEVICE (0x0525, 0x2888), // EPSON USB client
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.driver_info = (unsigned long) &epson2888_info,
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},
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#endif
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#ifdef CONFIG_USB_KC2190
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{
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USB_DEVICE (0x050f, 0x0190), // KC-190
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.driver_info = (unsigned long) &kc2190_info,
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},
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#endif
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#ifdef CONFIG_USB_ARMLINUX
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/*
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* SA-1100 using standard ARM Linux kernels, or compatible.
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* Often used when talking to Linux PDAs (iPaq, Yopy, etc).
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* The sa-1100 "usb-eth" driver handles the basic framing.
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*
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* PXA25x or PXA210 ... these use a "usb-eth" driver much like
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* the sa1100 one, but hardware uses different endpoint numbers.
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*
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* Or the Linux "Ethernet" gadget on hardware that can't talk
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* CDC Ethernet (e.g., no altsettings), in either of two modes:
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* - acting just like the old "usb-eth" firmware, though
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* the implementation is different
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* - supporting RNDIS as the first/default configuration for
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* MS-Windows interop; Linux needs to use the other config
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*/
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{
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// 1183 = 0x049F, both used as hex values?
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// Compaq "Itsy" vendor/product id
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USB_DEVICE (0x049F, 0x505A), // usb-eth, or compatible
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.driver_info = (unsigned long) &linuxdev_info,
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}, {
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USB_DEVICE (0x0E7E, 0x1001), // G.Mate "Yopy"
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.driver_info = (unsigned long) &yopy_info,
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}, {
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USB_DEVICE (0x8086, 0x07d3), // "blob" bootloader
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.driver_info = (unsigned long) &blob_info,
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}, {
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USB_DEVICE (0x1286, 0x8001), // "blob" bootloader
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.driver_info = (unsigned long) &blob_info,
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}, {
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// Linux Ethernet/RNDIS gadget, mostly on PXA, second config
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// e.g. Gumstix, current OpenZaurus, ... or anything else
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// that just enables this gadget option.
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USB_DEVICE (0x0525, 0xa4a2),
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.driver_info = (unsigned long) &linuxdev_info,
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},
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#endif
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{ }, // END
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};
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MODULE_DEVICE_TABLE(usb, products);
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/*-------------------------------------------------------------------------*/
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static int dummy_prereset(struct usb_interface *intf)
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{
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return 0;
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}
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static int dummy_postreset(struct usb_interface *intf)
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{
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return 0;
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}
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static struct usb_driver cdc_subset_driver = {
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.name = "cdc_subset",
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.probe = usbnet_probe,
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.suspend = usbnet_suspend,
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.resume = usbnet_resume,
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.pre_reset = dummy_prereset,
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.post_reset = dummy_postreset,
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.disconnect = usbnet_disconnect,
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.id_table = products,
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.disable_hub_initiated_lpm = 1,
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};
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module_usb_driver(cdc_subset_driver);
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MODULE_AUTHOR("David Brownell");
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MODULE_DESCRIPTION("Simple 'CDC Subset' USB networking links");
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MODULE_LICENSE("GPL");
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