![Sebastian Andrzej Siewior](/assets/img/avatar_default.png)
The bcdDevice field is defined as |Device release number in binary-coded decimal in the USB 2.0 specification. We use this field to distinguish the UDCs from each other. In theory this could be used on the host side to apply certain quirks if the "special" UDC in combination with this gadget is used. This hasn't been done as far as I am aware. In practice it would be better to fix the UDC driver before shipping since a later release might not need this quirk anymore. There are some driver in tree (on the host side) which use the bcdDevice field to figure out special workarounds for a given firmware revision. This seems to make sense. Therefore this patch converts all gadgets (except a few) to use the kernel version instead a random 2 or 3 plus the UDC number. The few that don't report kernel's version are: - webcam This one reports always a version 0x10 so allow it to do so in future. - nokia This one reports always 0x211. The comment says that this gadget works only if the UDC supports altsettings so I added a check for this. - serial This one reports 0x2400 + UDC number. Since the gadget version is 2.4 this could make sense. Therefore bcdDevice is 0x2400 here. I also remove various gadget_is_<name> macros which are unused. The remaining few macros should be moved to feature / bug bitfield. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
375 lines
11 KiB
C
375 lines
11 KiB
C
/*
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* ether.c -- Ethernet gadget driver, with CDC and non-CDC options
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*
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* Copyright (C) 2003-2005,2008 David Brownell
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* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
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* Copyright (C) 2008 Nokia Corporation
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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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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#if defined USB_ETH_RNDIS
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# undef USB_ETH_RNDIS
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#endif
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#ifdef CONFIG_USB_ETH_RNDIS
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# define USB_ETH_RNDIS y
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#endif
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#include "u_ether.h"
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/*
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* Ethernet gadget driver -- with CDC and non-CDC options
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* Builds on hardware support for a full duplex link.
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*
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* CDC Ethernet is the standard USB solution for sending Ethernet frames
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* using USB. Real hardware tends to use the same framing protocol but look
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* different for control features. This driver strongly prefers to use
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* this USB-IF standard as its open-systems interoperability solution;
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* most host side USB stacks (except from Microsoft) support it.
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*
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* This is sometimes called "CDC ECM" (Ethernet Control Model) to support
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* TLA-soup. "CDC ACM" (Abstract Control Model) is for modems, and a new
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* "CDC EEM" (Ethernet Emulation Model) is starting to spread.
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*
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* There's some hardware that can't talk CDC ECM. We make that hardware
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* implement a "minimalist" vendor-agnostic CDC core: same framing, but
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* link-level setup only requires activating the configuration. Only the
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* endpoint descriptors, and product/vendor IDs, are relevant; no control
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* operations are available. Linux supports it, but other host operating
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* systems may not. (This is a subset of CDC Ethernet.)
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*
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* It turns out that if you add a few descriptors to that "CDC Subset",
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* (Windows) host side drivers from MCCI can treat it as one submode of
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* a proprietary scheme called "SAFE" ... without needing to know about
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* specific product/vendor IDs. So we do that, making it easier to use
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* those MS-Windows drivers. Those added descriptors make it resemble a
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* CDC MDLM device, but they don't change device behavior at all. (See
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* MCCI Engineering report 950198 "SAFE Networking Functions".)
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*
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* A third option is also in use. Rather than CDC Ethernet, or something
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* simpler, Microsoft pushes their own approach: RNDIS. The published
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* RNDIS specs are ambiguous and appear to be incomplete, and are also
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* needlessly complex. They borrow more from CDC ACM than CDC ECM.
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*/
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#define DRIVER_DESC "Ethernet Gadget"
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#define DRIVER_VERSION "Memorial Day 2008"
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#ifdef USB_ETH_RNDIS
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#define PREFIX "RNDIS/"
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#else
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#define PREFIX ""
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#endif
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/*
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* This driver aims for interoperability by using CDC ECM unless
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*
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* can_support_ecm()
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*
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* returns false, in which case it supports the CDC Subset. By default,
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* that returns true; most hardware has no problems with CDC ECM, that's
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* a good default. Previous versions of this driver had no default; this
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* version changes that, removing overhead for new controller support.
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*
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* IF YOUR HARDWARE CAN'T SUPPORT CDC ECM, UPDATE THAT ROUTINE!
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*/
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static inline bool has_rndis(void)
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{
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#ifdef USB_ETH_RNDIS
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return true;
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#else
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return false;
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#endif
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}
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/*-------------------------------------------------------------------------*/
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "f_ecm.c"
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#include "f_subset.c"
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#ifdef USB_ETH_RNDIS
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#include "f_rndis.c"
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#include "rndis.c"
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#endif
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#include "f_eem.c"
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#include "u_ether.c"
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/*-------------------------------------------------------------------------*/
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USB_GADGET_COMPOSITE_OPTIONS();
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/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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/* Thanks to NetChip Technologies for donating this product ID.
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* It's for devices with only CDC Ethernet configurations.
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*/
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#define CDC_VENDOR_NUM 0x0525 /* NetChip */
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#define CDC_PRODUCT_NUM 0xa4a1 /* Linux-USB Ethernet Gadget */
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/* For hardware that can't talk CDC, we use the same vendor ID that
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* ARM Linux has used for ethernet-over-usb, both with sa1100 and
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* with pxa250. We're protocol-compatible, if the host-side drivers
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* use the endpoint descriptors. bcdDevice (version) is nonzero, so
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* drivers that need to hard-wire endpoint numbers have a hook.
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*
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* The protocol is a minimal subset of CDC Ether, which works on any bulk
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* hardware that's not deeply broken ... even on hardware that can't talk
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* RNDIS (like SA-1100, with no interrupt endpoint, or anything that
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* doesn't handle control-OUT).
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*/
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#define SIMPLE_VENDOR_NUM 0x049f
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#define SIMPLE_PRODUCT_NUM 0x505a
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/* For hardware that can talk RNDIS and either of the above protocols,
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* use this ID ... the windows INF files will know it. Unless it's
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* used with CDC Ethernet, Linux 2.4 hosts will need updates to choose
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* the non-RNDIS configuration.
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*/
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#define RNDIS_VENDOR_NUM 0x0525 /* NetChip */
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#define RNDIS_PRODUCT_NUM 0xa4a2 /* Ethernet/RNDIS Gadget */
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/* For EEM gadgets */
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#define EEM_VENDOR_NUM 0x1d6b /* Linux Foundation */
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#define EEM_PRODUCT_NUM 0x0102 /* EEM Gadget */
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/*-------------------------------------------------------------------------*/
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = cpu_to_le16 (0x0200),
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.bDeviceClass = USB_CLASS_COMM,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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/* .bMaxPacketSize0 = f(hardware) */
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/* Vendor and product id defaults change according to what configs
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* we support. (As does bNumConfigurations.) These values can
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* also be overridden by module parameters.
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*/
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.idVendor = cpu_to_le16 (CDC_VENDOR_NUM),
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.idProduct = cpu_to_le16 (CDC_PRODUCT_NUM),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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.bNumConfigurations = 1,
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "",
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[USB_GADGET_PRODUCT_IDX].s = PREFIX DRIVER_DESC,
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[USB_GADGET_SERIAL_IDX].s = "",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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static u8 hostaddr[ETH_ALEN];
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/*-------------------------------------------------------------------------*/
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/*
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* We may not have an RNDIS configuration, but if we do it needs to be
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* the first one present. That's to make Microsoft's drivers happy,
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* and to follow DOCSIS 1.0 (cable modem standard).
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*/
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static int __init rndis_do_config(struct usb_configuration *c)
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{
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/* FIXME alloc iConfiguration string, set it in c->strings */
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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return rndis_bind_config(c, hostaddr);
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}
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static struct usb_configuration rndis_config_driver = {
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.label = "RNDIS",
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.bConfigurationValue = 2,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_USB_ETH_EEM
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static bool use_eem = 1;
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#else
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static bool use_eem;
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#endif
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module_param(use_eem, bool, 0);
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MODULE_PARM_DESC(use_eem, "use CDC EEM mode");
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/*
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* We _always_ have an ECM, CDC Subset, or EEM configuration.
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*/
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static int __init eth_do_config(struct usb_configuration *c)
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{
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/* FIXME alloc iConfiguration string, set it in c->strings */
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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if (use_eem)
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return eem_bind_config(c);
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else if (can_support_ecm(c->cdev->gadget))
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return ecm_bind_config(c, hostaddr);
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else
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return geth_bind_config(c, hostaddr);
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}
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static struct usb_configuration eth_config_driver = {
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/* .label = f(hardware) */
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/*-------------------------------------------------------------------------*/
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static int __init eth_bind(struct usb_composite_dev *cdev)
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{
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struct usb_gadget *gadget = cdev->gadget;
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int status;
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/* set up network link layer */
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status = gether_setup(cdev->gadget, hostaddr);
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if (status < 0)
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return status;
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/* set up main config label and device descriptor */
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if (use_eem) {
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/* EEM */
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eth_config_driver.label = "CDC Ethernet (EEM)";
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device_desc.idVendor = cpu_to_le16(EEM_VENDOR_NUM);
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device_desc.idProduct = cpu_to_le16(EEM_PRODUCT_NUM);
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} else if (can_support_ecm(cdev->gadget)) {
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/* ECM */
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eth_config_driver.label = "CDC Ethernet (ECM)";
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} else {
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/* CDC Subset */
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eth_config_driver.label = "CDC Subset/SAFE";
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device_desc.idVendor = cpu_to_le16(SIMPLE_VENDOR_NUM);
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device_desc.idProduct = cpu_to_le16(SIMPLE_PRODUCT_NUM);
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if (!has_rndis())
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device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
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}
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if (has_rndis()) {
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/* RNDIS plus ECM-or-Subset */
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device_desc.idVendor = cpu_to_le16(RNDIS_VENDOR_NUM);
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device_desc.idProduct = cpu_to_le16(RNDIS_PRODUCT_NUM);
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device_desc.bNumConfigurations = 2;
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}
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/* Allocate string descriptor numbers ... note that string
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* contents can be overridden by the composite_dev glue.
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*/
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto fail;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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/* register our configuration(s); RNDIS first, if it's used */
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if (has_rndis()) {
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status = usb_add_config(cdev, &rndis_config_driver,
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rndis_do_config);
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if (status < 0)
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goto fail;
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}
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status = usb_add_config(cdev, ð_config_driver, eth_do_config);
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if (status < 0)
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goto fail;
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usb_composite_overwrite_options(cdev, &coverwrite);
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dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
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DRIVER_DESC);
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return 0;
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fail:
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gether_cleanup();
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return status;
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}
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static int __exit eth_unbind(struct usb_composite_dev *cdev)
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{
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gether_cleanup();
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return 0;
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}
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static __refdata struct usb_composite_driver eth_driver = {
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.name = "g_ether",
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.dev = &device_desc,
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.strings = dev_strings,
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.max_speed = USB_SPEED_SUPER,
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.bind = eth_bind,
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.unbind = __exit_p(eth_unbind),
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};
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MODULE_DESCRIPTION(PREFIX DRIVER_DESC);
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MODULE_AUTHOR("David Brownell, Benedikt Spanger");
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MODULE_LICENSE("GPL");
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static int __init init(void)
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{
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return usb_composite_probe(ð_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(ð_driver);
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}
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module_exit(cleanup);
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