| /* |
| * ether.c -- Ethernet gadget driver, with CDC and non-CDC options |
| * |
| * Copyright (C) 2003-2005,2008 David Brownell |
| * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger |
| * Copyright (C) 2008 Nokia Corporation |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| /* #define VERBOSE_DEBUG */ |
| |
| #include <linux/kernel.h> |
| #include <linux/utsname.h> |
| |
| #include "u_ether.h" |
| |
| |
| /* |
| * Ethernet gadget driver -- with CDC and non-CDC options |
| * Builds on hardware support for a full duplex link. |
| * |
| * CDC Ethernet is the standard USB solution for sending Ethernet frames |
| * using USB. Real hardware tends to use the same framing protocol but look |
| * different for control features. This driver strongly prefers to use |
| * this USB-IF standard as its open-systems interoperability solution; |
| * most host side USB stacks (except from Microsoft) support it. |
| * |
| * This is sometimes called "CDC ECM" (Ethernet Control Model) to support |
| * TLA-soup. "CDC ACM" (Abstract Control Model) is for modems, and a new |
| * "CDC EEM" (Ethernet Emulation Model) is starting to spread. |
| * |
| * There's some hardware that can't talk CDC ECM. We make that hardware |
| * implement a "minimalist" vendor-agnostic CDC core: same framing, but |
| * link-level setup only requires activating the configuration. Only the |
| * endpoint descriptors, and product/vendor IDs, are relevant; no control |
| * operations are available. Linux supports it, but other host operating |
| * systems may not. (This is a subset of CDC Ethernet.) |
| * |
| * It turns out that if you add a few descriptors to that "CDC Subset", |
| * (Windows) host side drivers from MCCI can treat it as one submode of |
| * a proprietary scheme called "SAFE" ... without needing to know about |
| * specific product/vendor IDs. So we do that, making it easier to use |
| * those MS-Windows drivers. Those added descriptors make it resemble a |
| * CDC MDLM device, but they don't change device behavior at all. (See |
| * MCCI Engineering report 950198 "SAFE Networking Functions".) |
| * |
| * A third option is also in use. Rather than CDC Ethernet, or something |
| * simpler, Microsoft pushes their own approach: RNDIS. The published |
| * RNDIS specs are ambiguous and appear to be incomplete, and are also |
| * needlessly complex. They borrow more from CDC ACM than CDC ECM. |
| */ |
| |
| #define DRIVER_DESC "Ethernet Gadget" |
| #define DRIVER_VERSION "Memorial Day 2008" |
| |
| #ifdef CONFIG_USB_ETH_RNDIS |
| #define PREFIX "RNDIS/" |
| #else |
| #define PREFIX "" |
| #endif |
| |
| /* |
| * This driver aims for interoperability by using CDC ECM unless |
| * |
| * can_support_ecm() |
| * |
| * returns false, in which case it supports the CDC Subset. By default, |
| * that returns true; most hardware has no problems with CDC ECM, that's |
| * a good default. Previous versions of this driver had no default; this |
| * version changes that, removing overhead for new controller support. |
| * |
| * IF YOUR HARDWARE CAN'T SUPPORT CDC ECM, UPDATE THAT ROUTINE! |
| */ |
| |
| static inline bool has_rndis(void) |
| { |
| #ifdef CONFIG_USB_ETH_RNDIS |
| return true; |
| #else |
| return false; |
| #endif |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * Kbuild is not very cooperative with respect to linking separately |
| * compiled library objects into one module. So for now we won't use |
| * separate compilation ... ensuring init/exit sections work to shrink |
| * the runtime footprint, and giving us at least some parts of what |
| * a "gcc --combine ... part1.c part2.c part3.c ... " build would. |
| */ |
| #include "composite.c" |
| #include "usbstring.c" |
| #include "config.c" |
| #include "epautoconf.c" |
| |
| #include "f_ecm.c" |
| #include "f_subset.c" |
| #ifdef CONFIG_USB_ETH_RNDIS |
| #include "f_rndis.c" |
| #include "rndis.c" |
| #endif |
| #include "u_ether.c" |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! |
| * Instead: allocate your own, using normal USB-IF procedures. |
| */ |
| |
| /* Thanks to NetChip Technologies for donating this product ID. |
| * It's for devices with only CDC Ethernet configurations. |
| */ |
| #define CDC_VENDOR_NUM 0x0525 /* NetChip */ |
| #define CDC_PRODUCT_NUM 0xa4a1 /* Linux-USB Ethernet Gadget */ |
| |
| /* For hardware that can't talk CDC, we use the same vendor ID that |
| * ARM Linux has used for ethernet-over-usb, both with sa1100 and |
| * with pxa250. We're protocol-compatible, if the host-side drivers |
| * use the endpoint descriptors. bcdDevice (version) is nonzero, so |
| * drivers that need to hard-wire endpoint numbers have a hook. |
| * |
| * The protocol is a minimal subset of CDC Ether, which works on any bulk |
| * hardware that's not deeply broken ... even on hardware that can't talk |
| * RNDIS (like SA-1100, with no interrupt endpoint, or anything that |
| * doesn't handle control-OUT). |
| */ |
| #define SIMPLE_VENDOR_NUM 0x049f |
| #define SIMPLE_PRODUCT_NUM 0x505a |
| |
| /* For hardware that can talk RNDIS and either of the above protocols, |
| * use this ID ... the windows INF files will know it. Unless it's |
| * used with CDC Ethernet, Linux 2.4 hosts will need updates to choose |
| * the non-RNDIS configuration. |
| */ |
| #define RNDIS_VENDOR_NUM 0x0525 /* NetChip */ |
| #define RNDIS_PRODUCT_NUM 0xa4a2 /* Ethernet/RNDIS Gadget */ |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static struct usb_device_descriptor device_desc = { |
| .bLength = sizeof device_desc, |
| .bDescriptorType = USB_DT_DEVICE, |
| |
| .bcdUSB = cpu_to_le16 (0x0200), |
| |
| .bDeviceClass = USB_CLASS_COMM, |
| .bDeviceSubClass = 0, |
| .bDeviceProtocol = 0, |
| /* .bMaxPacketSize0 = f(hardware) */ |
| |
| /* Vendor and product id defaults change according to what configs |
| * we support. (As does bNumConfigurations.) These values can |
| * also be overridden by module parameters. |
| */ |
| .idVendor = cpu_to_le16 (CDC_VENDOR_NUM), |
| .idProduct = cpu_to_le16 (CDC_PRODUCT_NUM), |
| /* .bcdDevice = f(hardware) */ |
| /* .iManufacturer = DYNAMIC */ |
| /* .iProduct = DYNAMIC */ |
| /* NO SERIAL NUMBER */ |
| .bNumConfigurations = 1, |
| }; |
| |
| static struct usb_otg_descriptor otg_descriptor = { |
| .bLength = sizeof otg_descriptor, |
| .bDescriptorType = USB_DT_OTG, |
| |
| /* REVISIT SRP-only hardware is possible, although |
| * it would not be called "OTG" ... |
| */ |
| .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, |
| }; |
| |
| static const struct usb_descriptor_header *otg_desc[] = { |
| (struct usb_descriptor_header *) &otg_descriptor, |
| NULL, |
| }; |
| |
| |
| /* string IDs are assigned dynamically */ |
| |
| #define STRING_MANUFACTURER_IDX 0 |
| #define STRING_PRODUCT_IDX 1 |
| |
| static char manufacturer[50]; |
| |
| static struct usb_string strings_dev[] = { |
| [STRING_MANUFACTURER_IDX].s = manufacturer, |
| [STRING_PRODUCT_IDX].s = PREFIX DRIVER_DESC, |
| { } /* end of list */ |
| }; |
| |
| static struct usb_gadget_strings stringtab_dev = { |
| .language = 0x0409, /* en-us */ |
| .strings = strings_dev, |
| }; |
| |
| static struct usb_gadget_strings *dev_strings[] = { |
| &stringtab_dev, |
| NULL, |
| }; |
| |
| static u8 hostaddr[ETH_ALEN]; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * We may not have an RNDIS configuration, but if we do it needs to be |
| * the first one present. That's to make Microsoft's drivers happy, |
| * and to follow DOCSIS 1.0 (cable modem standard). |
| */ |
| static int __init rndis_do_config(struct usb_configuration *c) |
| { |
| /* FIXME alloc iConfiguration string, set it in c->strings */ |
| |
| if (gadget_is_otg(c->cdev->gadget)) { |
| c->descriptors = otg_desc; |
| c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; |
| } |
| |
| return rndis_bind_config(c, hostaddr); |
| } |
| |
| static struct usb_configuration rndis_config_driver = { |
| .label = "RNDIS", |
| .bind = rndis_do_config, |
| .bConfigurationValue = 2, |
| /* .iConfiguration = DYNAMIC */ |
| .bmAttributes = USB_CONFIG_ATT_SELFPOWER, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * We _always_ have an ECM or CDC Subset configuration. |
| */ |
| static int __init eth_do_config(struct usb_configuration *c) |
| { |
| /* FIXME alloc iConfiguration string, set it in c->strings */ |
| |
| if (gadget_is_otg(c->cdev->gadget)) { |
| c->descriptors = otg_desc; |
| c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; |
| } |
| |
| if (can_support_ecm(c->cdev->gadget)) |
| return ecm_bind_config(c, hostaddr); |
| else |
| return geth_bind_config(c, hostaddr); |
| } |
| |
| static struct usb_configuration eth_config_driver = { |
| /* .label = f(hardware) */ |
| .bind = eth_do_config, |
| .bConfigurationValue = 1, |
| /* .iConfiguration = DYNAMIC */ |
| .bmAttributes = USB_CONFIG_ATT_SELFPOWER, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int __init eth_bind(struct usb_composite_dev *cdev) |
| { |
| int gcnum; |
| struct usb_gadget *gadget = cdev->gadget; |
| int status; |
| |
| /* set up network link layer */ |
| status = gether_setup(cdev->gadget, hostaddr); |
| if (status < 0) |
| return status; |
| |
| /* set up main config label and device descriptor */ |
| if (can_support_ecm(cdev->gadget)) { |
| /* ECM */ |
| eth_config_driver.label = "CDC Ethernet (ECM)"; |
| } else { |
| /* CDC Subset */ |
| eth_config_driver.label = "CDC Subset/SAFE"; |
| |
| device_desc.idVendor = cpu_to_le16(SIMPLE_VENDOR_NUM), |
| device_desc.idProduct = cpu_to_le16(SIMPLE_PRODUCT_NUM), |
| device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC; |
| } |
| |
| if (has_rndis()) { |
| /* RNDIS plus ECM-or-Subset */ |
| device_desc.idVendor = cpu_to_le16(RNDIS_VENDOR_NUM), |
| device_desc.idProduct = cpu_to_le16(RNDIS_PRODUCT_NUM), |
| device_desc.bNumConfigurations = 2; |
| } |
| |
| gcnum = usb_gadget_controller_number(gadget); |
| if (gcnum >= 0) |
| device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); |
| else { |
| /* We assume that can_support_ecm() tells the truth; |
| * but if the controller isn't recognized at all then |
| * that assumption is a bit more likely to be wrong. |
| */ |
| dev_warn(&gadget->dev, |
| "controller '%s' not recognized; trying %s\n", |
| gadget->name, |
| eth_config_driver.label); |
| device_desc.bcdDevice = |
| cpu_to_le16(0x0300 | 0x0099); |
| } |
| |
| |
| /* Allocate string descriptor numbers ... note that string |
| * contents can be overridden by the composite_dev glue. |
| */ |
| |
| /* device descriptor strings: manufacturer, product */ |
| snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", |
| init_utsname()->sysname, init_utsname()->release, |
| gadget->name); |
| status = usb_string_id(cdev); |
| if (status < 0) |
| goto fail; |
| strings_dev[STRING_MANUFACTURER_IDX].id = status; |
| device_desc.iManufacturer = status; |
| |
| status = usb_string_id(cdev); |
| if (status < 0) |
| goto fail; |
| strings_dev[STRING_PRODUCT_IDX].id = status; |
| device_desc.iProduct = status; |
| |
| /* register our configuration(s); RNDIS first, if it's used */ |
| if (has_rndis()) { |
| status = usb_add_config(cdev, &rndis_config_driver); |
| if (status < 0) |
| goto fail; |
| } |
| |
| status = usb_add_config(cdev, ð_config_driver); |
| if (status < 0) |
| goto fail; |
| |
| dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n", |
| DRIVER_DESC); |
| |
| return 0; |
| |
| fail: |
| gether_cleanup(); |
| return status; |
| } |
| |
| static int __exit eth_unbind(struct usb_composite_dev *cdev) |
| { |
| gether_cleanup(); |
| return 0; |
| } |
| |
| static struct usb_composite_driver eth_driver = { |
| .name = "g_ether", |
| .dev = &device_desc, |
| .strings = dev_strings, |
| .bind = eth_bind, |
| .unbind = __exit_p(eth_unbind), |
| }; |
| |
| MODULE_DESCRIPTION(PREFIX DRIVER_DESC); |
| MODULE_AUTHOR("David Brownell, Benedikt Spanger"); |
| MODULE_LICENSE("GPL"); |
| |
| static int __init init(void) |
| { |
| return usb_composite_register(ð_driver); |
| } |
| module_init(init); |
| |
| static void __exit cleanup(void) |
| { |
| usb_composite_unregister(ð_driver); |
| } |
| module_exit(cleanup); |