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gerrit-public.fairphone.software / kernel / msm-4.19 / 617780d290bd6eb2b260928c6acff5b7c6084154 / . / drivers / usb / gadget / ether.c
blob: dbaf867436dffbc69e3172810fd4b24a89d7c10f [file] [log] [blame]
/*
* ether.c -- Ethernet gadget driver, with CDC and non-CDC options
*
* Copyright (C) 2003-2005 David Brownell
* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
*
* 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 DEBUG 1
// #define VERBOSE
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>
#include <linux/usb/ch9.h>
#include <linux/usb/cdc.h>
#include <linux/usb_gadget.h>
#include <linux/random.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include "gadget_chips.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.
*
* There's some hardware that can't talk CDC. 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.
*/
#define DRIVER_DESC "Ethernet Gadget"
#define DRIVER_VERSION "May Day 2005"
static const char shortname [] = "ether";
static const char driver_desc [] = DRIVER_DESC;
#define RX_EXTRA 20 /* guard against rx overflows */
#include "rndis.h"
#ifndef CONFIG_USB_ETH_RNDIS
#define rndis_uninit(x) do{}while(0)
#define rndis_deregister(c) do{}while(0)
#define rndis_exit() do{}while(0)
#endif
/* CDC and RNDIS support the same host-chosen outgoing packet filters. */
#define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
|USB_CDC_PACKET_TYPE_PROMISCUOUS \
|USB_CDC_PACKET_TYPE_DIRECTED)
/*-------------------------------------------------------------------------*/
struct eth_dev {
spinlock_t lock;
struct usb_gadget *gadget;
struct usb_request *req; /* for control responses */
struct usb_request *stat_req; /* for cdc & rndis status */
u8 config;
struct usb_ep *in_ep, *out_ep, *status_ep;
const struct usb_endpoint_descriptor
*in, *out, *status;
spinlock_t req_lock;
struct list_head tx_reqs, rx_reqs;
struct net_device *net;
struct net_device_stats stats;
atomic_t tx_qlen;
struct work_struct work;
unsigned zlp:1;
unsigned cdc:1;
unsigned rndis:1;
unsigned suspended:1;
u16 cdc_filter;
unsigned long todo;
#define WORK_RX_MEMORY 0
int rndis_config;
u8 host_mac [ETH_ALEN];
};
/* This version autoconfigures as much as possible at run-time.
*
* It also ASSUMES a self-powered device, without remote wakeup,
* although remote wakeup support would make sense.
*/
/*-------------------------------------------------------------------------*/
/* 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 */
/* Some systems will want different product identifers published in the
* device descriptor, either numbers or strings or both. These string
* parameters are in UTF-8 (superset of ASCII's 7 bit characters).
*/
static ushort idVendor;
module_param(idVendor, ushort, S_IRUGO);
MODULE_PARM_DESC(idVendor, "USB Vendor ID");
static ushort idProduct;
module_param(idProduct, ushort, S_IRUGO);
MODULE_PARM_DESC(idProduct, "USB Product ID");
static ushort bcdDevice;
module_param(bcdDevice, ushort, S_IRUGO);
MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
static char *iManufacturer;
module_param(iManufacturer, charp, S_IRUGO);
MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
static char *iProduct;
module_param(iProduct, charp, S_IRUGO);
MODULE_PARM_DESC(iProduct, "USB Product string");
static char *iSerialNumber;
module_param(iSerialNumber, charp, S_IRUGO);
MODULE_PARM_DESC(iSerialNumber, "SerialNumber");
/* initial value, changed by "ifconfig usb0 hw ether xx:xx:xx:xx:xx:xx" */
static char *dev_addr;
module_param(dev_addr, charp, S_IRUGO);
MODULE_PARM_DESC(dev_addr, "Device Ethernet Address");
/* this address is invisible to ifconfig */
static char *host_addr;
module_param(host_addr, charp, S_IRUGO);
MODULE_PARM_DESC(host_addr, "Host Ethernet Address");
/*-------------------------------------------------------------------------*/
/* Include CDC support if we could run on CDC-capable hardware. */
#ifdef CONFIG_USB_GADGET_NET2280
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_DUMMY_HCD
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_GOKU
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_LH7A40X
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_MQ11XX
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_OMAP
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_N9604
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_PXA27X
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_S3C2410
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_AT91
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_MUSBHSFC
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_MUSB_HDRC
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_ATMEL_USBA
#define DEV_CONFIG_CDC
#endif
#ifdef CONFIG_USB_GADGET_FSL_USB2
#define DEV_CONFIG_CDC
#endif
/* For CDC-incapable hardware, choose the simple cdc subset.
* Anything that talks bulk (without notable bugs) can do this.
*/
#ifdef CONFIG_USB_GADGET_PXA2XX
#define DEV_CONFIG_SUBSET
#endif
#ifdef CONFIG_USB_GADGET_SUPERH
#define DEV_CONFIG_SUBSET
#endif
#ifdef CONFIG_USB_GADGET_SA1100
/* use non-CDC for backwards compatibility */
#define DEV_CONFIG_SUBSET
#endif
#ifdef CONFIG_USB_GADGET_M66592
#define DEV_CONFIG_CDC
#endif
/*-------------------------------------------------------------------------*/
/* "main" config is either CDC, or its simple subset */
static inline int is_cdc(struct eth_dev *dev)
{
#if !defined(DEV_CONFIG_SUBSET)
return 1; /* only cdc possible */
#elif !defined (DEV_CONFIG_CDC)
return 0; /* only subset possible */
#else
return dev->cdc; /* depends on what hardware we found */
#endif
}
/* "secondary" RNDIS config may sometimes be activated */
static inline int rndis_active(struct eth_dev *dev)
{
#ifdef CONFIG_USB_ETH_RNDIS
return dev->rndis;
#else
return 0;
#endif
}
#define subset_active(dev) (!is_cdc(dev) && !rndis_active(dev))
#define cdc_active(dev) ( is_cdc(dev) && !rndis_active(dev))
#define DEFAULT_QLEN 2 /* double buffering by default */
/* peak bulk transfer bits-per-second */
#define HS_BPS (13 * 512 * 8 * 1000 * 8)
#define FS_BPS (19 * 64 * 1 * 1000 * 8)
#ifdef CONFIG_USB_GADGET_DUALSPEED
#define DEVSPEED USB_SPEED_HIGH
static unsigned qmult = 5;
module_param (qmult, uint, S_IRUGO|S_IWUSR);
/* for dual-speed hardware, use deeper queues at highspeed */
#define qlen(gadget) \
(DEFAULT_QLEN*((gadget->speed == USB_SPEED_HIGH) ? qmult : 1))
/* also defer IRQs on highspeed TX */
#define TX_DELAY qmult
static inline int BITRATE(struct usb_gadget *g)
{
return (g->speed == USB_SPEED_HIGH) ? HS_BPS : FS_BPS;
}
#else /* full speed (low speed doesn't do bulk) */
#define DEVSPEED USB_SPEED_FULL
#define qlen(gadget) DEFAULT_QLEN
static inline int BITRATE(struct usb_gadget *g)
{
return FS_BPS;
}
#endif
/*-------------------------------------------------------------------------*/
#define xprintk(d,level,fmt,args...) \
printk(level "%s: " fmt , (d)->net->name , ## args)
#ifdef DEBUG
#undef DEBUG
#define DEBUG(dev,fmt,args...) \
xprintk(dev , KERN_DEBUG , fmt , ## args)
#else
#define DEBUG(dev,fmt,args...) \
do { } while (0)
#endif /* DEBUG */
#ifdef VERBOSE
#define VDEBUG DEBUG
#else
#define VDEBUG(dev,fmt,args...) \
do { } while (0)
#endif /* DEBUG */
#define ERROR(dev,fmt,args...) \
xprintk(dev , KERN_ERR , fmt , ## args)
#define WARN(dev,fmt,args...) \
xprintk(dev , KERN_WARNING , fmt , ## args)
#define INFO(dev,fmt,args...) \
xprintk(dev , KERN_INFO , fmt , ## args)
/*-------------------------------------------------------------------------*/
/* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
* ep0 implementation: descriptors, config management, setup().
* also optional class-specific notification interrupt transfer.
*/
/*
* DESCRIPTORS ... most are static, but strings and (full) configuration
* descriptors are built on demand. For now we do either full CDC, or
* our simple subset, with RNDIS as an optional second configuration.
*
* RNDIS includes some CDC ACM descriptors ... like CDC Ethernet. But
* the class descriptors match a modem (they're ignored; it's really just
* Ethernet functionality), they don't need the NOP altsetting, and the
* status transfer endpoint isn't optional.
*/
#define STRING_MANUFACTURER 1
#define STRING_PRODUCT 2
#define STRING_ETHADDR 3
#define STRING_DATA 4
#define STRING_CONTROL 5
#define STRING_RNDIS_CONTROL 6
#define STRING_CDC 7
#define STRING_SUBSET 8
#define STRING_RNDIS 9
#define STRING_SERIALNUMBER 10
/* holds our biggest descriptor (or RNDIS response) */
#define USB_BUFSIZ 256
/*
* This device advertises one configuration, eth_config, unless RNDIS
* is enabled (rndis_config) on hardware supporting at least two configs.
*
* NOTE: Controllers like superh_udc should probably be able to use
* an RNDIS-only configuration.
*
* FIXME define some higher-powered configurations to make it easier
* to recharge batteries ...
*/
#define DEV_CONFIG_VALUE 1 /* cdc or subset */
#define DEV_RNDIS_CONFIG_VALUE 2 /* rndis; optional */
static struct usb_device_descriptor
device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = __constant_cpu_to_le16 (0x0200),
.bDeviceClass = USB_CLASS_COMM,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.idVendor = __constant_cpu_to_le16 (CDC_VENDOR_NUM),
.idProduct = __constant_cpu_to_le16 (CDC_PRODUCT_NUM),
.iManufacturer = STRING_MANUFACTURER,
.iProduct = STRING_PRODUCT,
.bNumConfigurations = 1,
};
static struct usb_otg_descriptor
otg_descriptor = {
.bLength = sizeof otg_descriptor,
.bDescriptorType = USB_DT_OTG,
.bmAttributes = USB_OTG_SRP,
};
static struct usb_config_descriptor
eth_config = {
.bLength = sizeof eth_config,
.bDescriptorType = USB_DT_CONFIG,
/* compute wTotalLength on the fly */
.bNumInterfaces = 2,
.bConfigurationValue = DEV_CONFIG_VALUE,
.iConfiguration = STRING_CDC,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = 50,
};
#ifdef CONFIG_USB_ETH_RNDIS
static struct usb_config_descriptor
rndis_config = {
.bLength = sizeof rndis_config,
.bDescriptorType = USB_DT_CONFIG,
/* compute wTotalLength on the fly */
.bNumInterfaces = 2,
.bConfigurationValue = DEV_RNDIS_CONFIG_VALUE,
.iConfiguration = STRING_RNDIS,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = 50,
};
#endif
/*
* Compared to the simple CDC subset, the full CDC Ethernet model adds
* three class descriptors, two interface descriptors, optional status
* endpoint. Both have a "data" interface and two bulk endpoints.
* There are also differences in how control requests are handled.
*
* RNDIS shares a lot with CDC-Ethernet, since it's a variant of the
* CDC-ACM (modem) spec. Unfortunately MSFT's RNDIS driver is buggy; it
* may hang or oops. Since bugfixes (or accurate specs, letting Linux
* work around those bugs) are unlikely to ever come from MSFT, you may
* wish to avoid using RNDIS.
*
* MCCI offers an alternative to RNDIS if you need to connect to Windows
* but have hardware that can't support CDC Ethernet. We add descriptors
* to present the CDC Subset as a (nonconformant) CDC MDLM variant called
* "SAFE". That borrows from both CDC Ethernet and CDC MDLM. You can
* get those drivers from MCCI, or bundled with various products.
*/
#ifdef DEV_CONFIG_CDC
static struct usb_interface_descriptor
control_intf = {
.bLength = sizeof control_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
/* status endpoint is optional; this may be patched later */
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
.iInterface = STRING_CONTROL,
};
#endif
#ifdef CONFIG_USB_ETH_RNDIS
static const struct usb_interface_descriptor
rndis_control_intf = {
.bLength = sizeof rndis_control_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
.bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
.iInterface = STRING_RNDIS_CONTROL,
};
#endif
static const struct usb_cdc_header_desc header_desc = {
.bLength = sizeof header_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = __constant_cpu_to_le16 (0x0110),
};
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
static const struct usb_cdc_union_desc union_desc = {
.bLength = sizeof union_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
.bMasterInterface0 = 0, /* index of control interface */
.bSlaveInterface0 = 1, /* index of DATA interface */
};
#endif /* CDC || RNDIS */
#ifdef CONFIG_USB_ETH_RNDIS
static const struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
.bLength = sizeof call_mgmt_descriptor,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
.bmCapabilities = 0x00,
.bDataInterface = 0x01,
};
static const struct usb_cdc_acm_descriptor acm_descriptor = {
.bLength = sizeof acm_descriptor,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ACM_TYPE,
.bmCapabilities = 0x00,
};
#endif
#ifndef DEV_CONFIG_CDC
/* "SAFE" loosely follows CDC WMC MDLM, violating the spec in various
* ways: data endpoints live in the control interface, there's no data
* interface, and it's not used to talk to a cell phone radio.
*/
static const struct usb_cdc_mdlm_desc mdlm_desc = {
.bLength = sizeof mdlm_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_MDLM_TYPE,
.bcdVersion = __constant_cpu_to_le16(0x0100),
.bGUID = {
0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
},
};
/* since "usb_cdc_mdlm_detail_desc" is a variable length structure, we
* can't really use its struct. All we do here is say that we're using
* the submode of "SAFE" which directly matches the CDC Subset.
*/
static const u8 mdlm_detail_desc[] = {
6,
USB_DT_CS_INTERFACE,
USB_CDC_MDLM_DETAIL_TYPE,
0, /* "SAFE" */
0, /* network control capabilities (none) */
0, /* network data capabilities ("raw" encapsulation) */
};
#endif
static const struct usb_cdc_ether_desc ether_desc = {
.bLength = sizeof ether_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
/* this descriptor actually adds value, surprise! */
.iMACAddress = STRING_ETHADDR,
.bmEthernetStatistics = __constant_cpu_to_le32 (0), /* no statistics */
.wMaxSegmentSize = __constant_cpu_to_le16 (ETH_FRAME_LEN),
.wNumberMCFilters = __constant_cpu_to_le16 (0),
.bNumberPowerFilters = 0,
};
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
/* include the status endpoint if we can, even where it's optional.
* use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
* packet, to simplify cancellation; and a big transfer interval, to
* waste less bandwidth.
*
* some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
* if they ignore the connect/disconnect notifications that real aether
* can provide. more advanced cdc configurations might want to support
* encapsulated commands (vendor-specific, using control-OUT).
*
* RNDIS requires the status endpoint, since it uses that encapsulation
* mechanism for its funky RPC scheme.
*/
#define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
#define STATUS_BYTECOUNT 16 /* 8 byte header + data */
static struct usb_endpoint_descriptor
fs_status_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = __constant_cpu_to_le16 (STATUS_BYTECOUNT),
.bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC,
};
#endif
#ifdef DEV_CONFIG_CDC
/* the default data interface has no endpoints ... */
static const struct usb_interface_descriptor
data_nop_intf = {
.bLength = sizeof data_nop_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
};
/* ... but the "real" data interface has two bulk endpoints */
static const struct usb_interface_descriptor
data_intf = {
.bLength = sizeof data_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 1,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = STRING_DATA,
};
#endif
#ifdef CONFIG_USB_ETH_RNDIS
/* RNDIS doesn't activate by changing to the "real" altsetting */
static const struct usb_interface_descriptor
rndis_data_intf = {
.bLength = sizeof rndis_data_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = STRING_DATA,
};
#endif
#ifdef DEV_CONFIG_SUBSET
/*
* "Simple" CDC-subset option is a simple vendor-neutral model that most
* full speed controllers can handle: one interface, two bulk endpoints.
*
* To assist host side drivers, we fancy it up a bit, and add descriptors
* so some host side drivers will understand it as a "SAFE" variant.
*/
static const struct usb_interface_descriptor
subset_data_intf = {
.bLength = sizeof subset_data_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_MDLM,
.bInterfaceProtocol = 0,
.iInterface = STRING_DATA,
};
#endif /* SUBSET */
static struct usb_endpoint_descriptor
fs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor
fs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static const struct usb_descriptor_header *fs_eth_function [11] = {
(struct usb_descriptor_header *) &otg_descriptor,
#ifdef DEV_CONFIG_CDC
/* "cdc" mode descriptors */
(struct usb_descriptor_header *) &control_intf,
(struct usb_descriptor_header *) &header_desc,
(struct usb_descriptor_header *) &union_desc,
(struct usb_descriptor_header *) &ether_desc,
/* NOTE: status endpoint may need to be removed */
(struct usb_descriptor_header *) &fs_status_desc,
/* data interface, with altsetting */
(struct usb_descriptor_header *) &data_nop_intf,
(struct usb_descriptor_header *) &data_intf,
(struct usb_descriptor_header *) &fs_source_desc,
(struct usb_descriptor_header *) &fs_sink_desc,
NULL,
#endif /* DEV_CONFIG_CDC */
};
static inline void __init fs_subset_descriptors(void)
{
#ifdef DEV_CONFIG_SUBSET
/* behavior is "CDC Subset"; extra descriptors say "SAFE" */
fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
fs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
fs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
fs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
fs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
fs_eth_function[6] = (struct usb_descriptor_header *) &fs_source_desc;
fs_eth_function[7] = (struct usb_descriptor_header *) &fs_sink_desc;
fs_eth_function[8] = NULL;
#else
fs_eth_function[1] = NULL;
#endif
}
#ifdef CONFIG_USB_ETH_RNDIS
static const struct usb_descriptor_header *fs_rndis_function [] = {
(struct usb_descriptor_header *) &otg_descriptor,
/* control interface matches ACM, not Ethernet */
(struct usb_descriptor_header *) &rndis_control_intf,
(struct usb_descriptor_header *) &header_desc,
(struct usb_descriptor_header *) &call_mgmt_descriptor,
(struct usb_descriptor_header *) &acm_descriptor,
(struct usb_descriptor_header *) &union_desc,
(struct usb_descriptor_header *) &fs_status_desc,
/* data interface has no altsetting */
(struct usb_descriptor_header *) &rndis_data_intf,
(struct usb_descriptor_header *) &fs_source_desc,
(struct usb_descriptor_header *) &fs_sink_desc,
NULL,
};
#endif
#ifdef CONFIG_USB_GADGET_DUALSPEED
/*
* usb 2.0 devices need to expose both high speed and full speed
* descriptors, unless they only run at full speed.
*/
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
static struct usb_endpoint_descriptor
hs_status_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = __constant_cpu_to_le16 (STATUS_BYTECOUNT),
.bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
};
#endif /* DEV_CONFIG_CDC */
static struct usb_endpoint_descriptor
hs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16 (512),
};
static struct usb_endpoint_descriptor
hs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16 (512),
};
static struct usb_qualifier_descriptor
dev_qualifier = {
.bLength = sizeof dev_qualifier,
.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
.bcdUSB = __constant_cpu_to_le16 (0x0200),
.bDeviceClass = USB_CLASS_COMM,
.bNumConfigurations = 1,
};
static const struct usb_descriptor_header *hs_eth_function [11] = {
(struct usb_descriptor_header *) &otg_descriptor,
#ifdef DEV_CONFIG_CDC
/* "cdc" mode descriptors */
(struct usb_descriptor_header *) &control_intf,
(struct usb_descriptor_header *) &header_desc,
(struct usb_descriptor_header *) &union_desc,
(struct usb_descriptor_header *) &ether_desc,
/* NOTE: status endpoint may need to be removed */
(struct usb_descriptor_header *) &hs_status_desc,
/* data interface, with altsetting */
(struct usb_descriptor_header *) &data_nop_intf,
(struct usb_descriptor_header *) &data_intf,
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
NULL,
#endif /* DEV_CONFIG_CDC */
};
static inline void __init hs_subset_descriptors(void)
{
#ifdef DEV_CONFIG_SUBSET
/* behavior is "CDC Subset"; extra descriptors say "SAFE" */
hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
hs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
hs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
hs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
hs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
hs_eth_function[6] = (struct usb_descriptor_header *) &hs_source_desc;
hs_eth_function[7] = (struct usb_descriptor_header *) &hs_sink_desc;
hs_eth_function[8] = NULL;
#else
hs_eth_function[1] = NULL;
#endif
}
#ifdef CONFIG_USB_ETH_RNDIS
static const struct usb_descriptor_header *hs_rndis_function [] = {
(struct usb_descriptor_header *) &otg_descriptor,
/* control interface matches ACM, not Ethernet */
(struct usb_descriptor_header *) &rndis_control_intf,
(struct usb_descriptor_header *) &header_desc,
(struct usb_descriptor_header *) &call_mgmt_descriptor,
(struct usb_descriptor_header *) &acm_descriptor,
(struct usb_descriptor_header *) &union_desc,
(struct usb_descriptor_header *) &hs_status_desc,
/* data interface has no altsetting */
(struct usb_descriptor_header *) &rndis_data_intf,
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
NULL,
};
#endif
/* maxpacket and other transfer characteristics vary by speed. */
#define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))
#else
/* if there's no high speed support, maxpacket doesn't change. */
#define ep_desc(g,hs,fs) (((void)(g)), (fs))
static inline void __init hs_subset_descriptors(void)
{
}
#endif /* !CONFIG_USB_GADGET_DUALSPEED */
/*-------------------------------------------------------------------------*/
/* descriptors that are built on-demand */
static char manufacturer [50];
static char product_desc [40] = DRIVER_DESC;
static char serial_number [20];
/* address that the host will use ... usually assigned at random */
static char ethaddr [2 * ETH_ALEN + 1];
/* static strings, in UTF-8 */
static struct usb_string strings [] = {
{ STRING_MANUFACTURER, manufacturer, },
{ STRING_PRODUCT, product_desc, },
{ STRING_SERIALNUMBER, serial_number, },
{ STRING_DATA, "Ethernet Data", },
{ STRING_ETHADDR, ethaddr, },
#ifdef DEV_CONFIG_CDC
{ STRING_CDC, "CDC Ethernet", },
{ STRING_CONTROL, "CDC Communications Control", },
#endif
#ifdef DEV_CONFIG_SUBSET
{ STRING_SUBSET, "CDC Ethernet Subset", },
#endif
#ifdef CONFIG_USB_ETH_RNDIS
{ STRING_RNDIS, "RNDIS", },
{ STRING_RNDIS_CONTROL, "RNDIS Communications Control", },
#endif
{ } /* end of list */
};
static struct usb_gadget_strings stringtab = {
.language = 0x0409, /* en-us */
.strings = strings,
};
/*
* one config, two interfaces: control, data.
* complications: class descriptors, and an altsetting.
*/
static int
config_buf (enum usb_device_speed speed,
u8 *buf, u8 type,
unsigned index, int is_otg)
{
int len;
const struct usb_config_descriptor *config;
const struct usb_descriptor_header **function;
#ifdef CONFIG_USB_GADGET_DUALSPEED
int hs = (speed == USB_SPEED_HIGH);
if (type == USB_DT_OTHER_SPEED_CONFIG)
hs = !hs;
#define which_fn(t) (hs ? hs_ ## t ## _function : fs_ ## t ## _function)
#else
#define which_fn(t) (fs_ ## t ## _function)
#endif
if (index >= device_desc.bNumConfigurations)
return -EINVAL;
#ifdef CONFIG_USB_ETH_RNDIS
/* list the RNDIS config first, to make Microsoft's drivers
* happy. DOCSIS 1.0 needs this too.
*/
if (device_desc.bNumConfigurations == 2 && index == 0) {
config = &rndis_config;
function = which_fn (rndis);
} else
#endif
{
config = &eth_config;
function = which_fn (eth);
}
/* for now, don't advertise srp-only devices */
if (!is_otg)
function++;
len = usb_gadget_config_buf (config, buf, USB_BUFSIZ, function);
if (len < 0)
return len;
((struct usb_config_descriptor *) buf)->bDescriptorType = type;
return len;
}
/*-------------------------------------------------------------------------*/
static void eth_start (struct eth_dev *dev, gfp_t gfp_flags);
static int alloc_requests (struct eth_dev *dev, unsigned n, gfp_t gfp_flags);
static int
set_ether_config (struct eth_dev *dev, gfp_t gfp_flags)
{
int result = 0;
struct usb_gadget *gadget = dev->gadget;
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
/* status endpoint used for RNDIS and (optionally) CDC */
if (!subset_active(dev) && dev->status_ep) {
dev->status = ep_desc (gadget, &hs_status_desc,
&fs_status_desc);
dev->status_ep->driver_data = dev;
result = usb_ep_enable (dev->status_ep, dev->status);
if (result != 0) {
DEBUG (dev, "enable %s --> %d\n",
dev->status_ep->name, result);
goto done;
}
}
#endif
dev->in = ep_desc(gadget, &hs_source_desc, &fs_source_desc);
dev->in_ep->driver_data = dev;
dev->out = ep_desc(gadget, &hs_sink_desc, &fs_sink_desc);
dev->out_ep->driver_data = dev;
/* With CDC, the host isn't allowed to use these two data
* endpoints in the default altsetting for the interface.
* so we don't activate them yet. Reset from SET_INTERFACE.
*
* Strictly speaking RNDIS should work the same: activation is
* a side effect of setting a packet filter. Deactivation is
* from REMOTE_NDIS_HALT_MSG, reset from REMOTE_NDIS_RESET_MSG.
*/
if (!cdc_active(dev)) {
result = usb_ep_enable (dev->in_ep, dev->in);
if (result != 0) {
DEBUG(dev, "enable %s --> %d\n",
dev->in_ep->name, result);
goto done;
}
result = usb_ep_enable (dev->out_ep, dev->out);
if (result != 0) {
DEBUG (dev, "enable %s --> %d\n",
dev->out_ep->name, result);
goto done;
}
}
done:
if (result == 0)
result = alloc_requests (dev, qlen (gadget), gfp_flags);
/* on error, disable any endpoints */
if (result < 0) {
if (!subset_active(dev))
(void) usb_ep_disable (dev->status_ep);
dev->status = NULL;
(void) usb_ep_disable (dev->in_ep);
(void) usb_ep_disable (dev->out_ep);
dev->in = NULL;
dev->out = NULL;
} else
/* activate non-CDC configs right away
* this isn't strictly according to the RNDIS spec
*/
if (!cdc_active (dev)) {
netif_carrier_on (dev->net);
if (netif_running (dev->net)) {
spin_unlock (&dev->lock);
eth_start (dev, GFP_ATOMIC);
spin_lock (&dev->lock);
}
}
if (result == 0)
DEBUG (dev, "qlen %d\n", qlen (gadget));
/* caller is responsible for cleanup on error */
return result;
}
static void eth_reset_config (struct eth_dev *dev)
{
struct usb_request *req;
if (dev->config == 0)
return;
DEBUG (dev, "%s\n", __FUNCTION__);
netif_stop_queue (dev->net);
netif_carrier_off (dev->net);
rndis_uninit(dev->rndis_config);
/* disable endpoints, forcing (synchronous) completion of
* pending i/o. then free the requests.
*/
if (dev->in) {
usb_ep_disable (dev->in_ep);
spin_lock(&dev->req_lock);
while (likely (!list_empty (&dev->tx_reqs))) {
req = container_of (dev->tx_reqs.next,
struct usb_request, list);
list_del (&req->list);
spin_unlock(&dev->req_lock);
usb_ep_free_request (dev->in_ep, req);
spin_lock(&dev->req_lock);
}
spin_unlock(&dev->req_lock);
}
if (dev->out) {
usb_ep_disable (dev->out_ep);
spin_lock(&dev->req_lock);
while (likely (!list_empty (&dev->rx_reqs))) {
req = container_of (dev->rx_reqs.next,
struct usb_request, list);
list_del (&req->list);
spin_unlock(&dev->req_lock);
usb_ep_free_request (dev->out_ep, req);
spin_lock(&dev->req_lock);
}
spin_unlock(&dev->req_lock);
}
if (dev->status) {
usb_ep_disable (dev->status_ep);
}
dev->rndis = 0;
dev->cdc_filter = 0;
dev->config = 0;
}
/* change our operational config. must agree with the code
* that returns config descriptors, and altsetting code.
*/
static int
eth_set_config (struct eth_dev *dev, unsigned number, gfp_t gfp_flags)
{
int result = 0;
struct usb_gadget *gadget = dev->gadget;
if (gadget_is_sa1100 (gadget)
&& dev->config
&& atomic_read (&dev->tx_qlen) != 0) {
/* tx fifo is full, but we can't clear it...*/
INFO (dev, "can't change configurations\n");
return -ESPIPE;
}
eth_reset_config (dev);
switch (number) {
case DEV_CONFIG_VALUE:
result = set_ether_config (dev, gfp_flags);
break;
#ifdef CONFIG_USB_ETH_RNDIS
case DEV_RNDIS_CONFIG_VALUE:
dev->rndis = 1;
result = set_ether_config (dev, gfp_flags);
break;
#endif
default:
result = -EINVAL;
/* FALL THROUGH */
case 0:
break;
}
if (result) {
if (number)
eth_reset_config (dev);
usb_gadget_vbus_draw(dev->gadget,
dev->gadget->is_otg ? 8 : 100);
} else {
char *speed;
unsigned power;
power = 2 * eth_config.bMaxPower;
usb_gadget_vbus_draw(dev->gadget, power);
switch (gadget->speed) {
case USB_SPEED_FULL: speed = "full"; break;
#ifdef CONFIG_USB_GADGET_DUALSPEED
case USB_SPEED_HIGH: speed = "high"; break;
#endif
default: speed = "?"; break;
}
dev->config = number;
INFO (dev, "%s speed config #%d: %d mA, %s, using %s\n",
speed, number, power, driver_desc,
rndis_active(dev)
? "RNDIS"
: (cdc_active(dev)
? "CDC Ethernet"
: "CDC Ethernet Subset"));
}
return result;
}
/*-------------------------------------------------------------------------*/
#ifdef DEV_CONFIG_CDC
/* The interrupt endpoint is used in CDC networking models (Ethernet, ATM)
* only to notify the host about link status changes (which we support) or
* report completion of some encapsulated command (as used in RNDIS). Since
* we want this CDC Ethernet code to be vendor-neutral, we don't use that
* command mechanism; and only one status request is ever queued.
*/
static void eth_status_complete (struct usb_ep *ep, struct usb_request *req)
{
struct usb_cdc_notification *event = req->buf;
int value = req->status;
struct eth_dev *dev = ep->driver_data;
/* issue the second notification if host reads the first */
if (event->bNotificationType == USB_CDC_NOTIFY_NETWORK_CONNECTION
&& value == 0) {
__le32 *data = req->buf + sizeof *event;
event->bmRequestType = 0xA1;
event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
event->wValue = __constant_cpu_to_le16 (0);
event->wIndex = __constant_cpu_to_le16 (1);
event->wLength = __constant_cpu_to_le16 (8);
/* SPEED_CHANGE data is up/down speeds in bits/sec */
data [0] = data [1] = cpu_to_le32 (BITRATE (dev->gadget));
req->length = STATUS_BYTECOUNT;
value = usb_ep_queue (ep, req, GFP_ATOMIC);
DEBUG (dev, "send SPEED_CHANGE --> %d\n", value);
if (value == 0)
return;
} else if (value != -ECONNRESET)
DEBUG (dev, "event %02x --> %d\n",
event->bNotificationType, value);
req->context = NULL;
}
static void issue_start_status (struct eth_dev *dev)
{
struct usb_request *req = dev->stat_req;
struct usb_cdc_notification *event;
int value;
DEBUG (dev, "%s, flush old status first\n", __FUNCTION__);
/* flush old status
*
* FIXME ugly idiom, maybe we'd be better with just
* a "cancel the whole queue" primitive since any
* unlink-one primitive has way too many error modes.
* here, we "know" toggle is already clear...
*
* FIXME iff req->context != null just dequeue it
*/
usb_ep_disable (dev->status_ep);
usb_ep_enable (dev->status_ep, dev->status);
/* 3.8.1 says to issue first NETWORK_CONNECTION, then
* a SPEED_CHANGE. could be useful in some configs.
*/
event = req->buf;
event->bmRequestType = 0xA1;
event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
event->wValue = __constant_cpu_to_le16 (1); /* connected */
event->wIndex = __constant_cpu_to_le16 (1);
event->wLength = 0;
req->length = sizeof *event;
req->complete = eth_status_complete;
req->context = dev;
value = usb_ep_queue (dev->status_ep, req, GFP_ATOMIC);
if (value < 0)
DEBUG (dev, "status buf queue --> %d\n", value);
}
#endif
/*-------------------------------------------------------------------------*/
static void eth_setup_complete (struct usb_ep *ep, struct usb_request *req)
{
if (req->status || req->actual != req->length)
DEBUG ((struct eth_dev *) ep->driver_data,
"setup complete --> %d, %d/%d\n",
req->status, req->actual, req->length);
}
#ifdef CONFIG_USB_ETH_RNDIS
static void rndis_response_complete (struct usb_ep *ep, struct usb_request *req)
{
if (req->status || req->actual != req->length)
DEBUG ((struct eth_dev *) ep->driver_data,
"rndis response complete --> %d, %d/%d\n",
req->status, req->actual, req->length);
/* done sending after USB_CDC_GET_ENCAPSULATED_RESPONSE */
}
static void rndis_command_complete (struct usb_ep *ep, struct usb_request *req)
{
struct eth_dev *dev = ep->driver_data;
int status;
/* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
spin_lock(&dev->lock);
status = rndis_msg_parser (dev->rndis_config, (u8 *) req->buf);
if (status < 0)
ERROR(dev, "%s: rndis parse error %d\n", __FUNCTION__, status);
spin_unlock(&dev->lock);
}
#endif /* RNDIS */
/*
* The setup() callback implements all the ep0 functionality that's not
* handled lower down. CDC has a number of less-common features:
*
* - two interfaces: control, and ethernet data
* - Ethernet data interface has two altsettings: default, and active
* - class-specific descriptors for the control interface
* - class-specific control requests
*/
static int
eth_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
{
struct eth_dev *dev = get_gadget_data (gadget);
struct usb_request *req = dev->req;
int value = -EOPNOTSUPP;
u16 wIndex = le16_to_cpu(ctrl->wIndex);
u16 wValue = le16_to_cpu(ctrl->wValue);
u16 wLength = le16_to_cpu(ctrl->wLength);
/* descriptors just go into the pre-allocated ep0 buffer,
* while config change events may enable network traffic.
*/
req->complete = eth_setup_complete;
switch (ctrl->bRequest) {
case USB_REQ_GET_DESCRIPTOR:
if (ctrl->bRequestType != USB_DIR_IN)
break;
switch (wValue >> 8) {
case USB_DT_DEVICE:
value = min (wLength, (u16) sizeof device_desc);
memcpy (req->buf, &device_desc, value);
break;
#ifdef CONFIG_USB_GADGET_DUALSPEED
case USB_DT_DEVICE_QUALIFIER:
if (!gadget->is_dualspeed)
break;
value = min (wLength, (u16) sizeof dev_qualifier);
memcpy (req->buf, &dev_qualifier, value);
break;
case USB_DT_OTHER_SPEED_CONFIG:
if (!gadget->is_dualspeed)
break;
// FALLTHROUGH
#endif /* CONFIG_USB_GADGET_DUALSPEED */
case USB_DT_CONFIG:
value = config_buf (gadget->speed, req->buf,
wValue >> 8,
wValue & 0xff,
gadget->is_otg);
if (value >= 0)
value = min (wLength, (u16) value);
break;
case USB_DT_STRING:
value = usb_gadget_get_string (&stringtab,
wValue & 0xff, req->buf);
if (value >= 0)
value = min (wLength, (u16) value);
break;
}
break;
case USB_REQ_SET_CONFIGURATION:
if (ctrl->bRequestType != 0)
break;
if (gadget->a_hnp_support)
DEBUG (dev, "HNP available\n");
else if (gadget->a_alt_hnp_support)
DEBUG (dev, "HNP needs a different root port\n");
spin_lock (&dev->lock);
value = eth_set_config (dev, wValue, GFP_ATOMIC);
spin_unlock (&dev->lock);
break;
case USB_REQ_GET_CONFIGURATION:
if (ctrl->bRequestType != USB_DIR_IN)
break;
*(u8 *)req->buf = dev->config;
value = min (wLength, (u16) 1);
break;
case USB_REQ_SET_INTERFACE:
if (ctrl->bRequestType != USB_RECIP_INTERFACE
|| !dev->config
|| wIndex > 1)
break;
if (!cdc_active(dev) && wIndex != 0)
break;
spin_lock (&dev->lock);
/* PXA hardware partially handles SET_INTERFACE;
* we need to kluge around that interference.
*/
if (gadget_is_pxa (gadget)) {
value = eth_set_config (dev, DEV_CONFIG_VALUE,
GFP_ATOMIC);
goto done_set_intf;
}
#ifdef DEV_CONFIG_CDC
switch (wIndex) {
case 0: /* control/master intf */
if (wValue != 0)
break;
if (dev->status) {
usb_ep_disable (dev->status_ep);
usb_ep_enable (dev->status_ep, dev->status);
}
value = 0;
break;
case 1: /* data intf */
if (wValue > 1)
break;
usb_ep_disable (dev->in_ep);
usb_ep_disable (dev->out_ep);
/* CDC requires the data transfers not be done from
* the default interface setting ... also, setting
* the non-default interface resets filters etc.
*/
if (wValue == 1) {
if (!cdc_active (dev))
break;
usb_ep_enable (dev->in_ep, dev->in);
usb_ep_enable (dev->out_ep, dev->out);
dev->cdc_filter = DEFAULT_FILTER;
netif_carrier_on (dev->net);
if (dev->status)
issue_start_status (dev);
if (netif_running (dev->net)) {
spin_unlock (&dev->lock);
eth_start (dev, GFP_ATOMIC);
spin_lock (&dev->lock);
}
} else {
netif_stop_queue (dev->net);
netif_carrier_off (dev->net);
}
value = 0;
break;
}
#else
/* FIXME this is wrong, as is the assumption that
* all non-PXA hardware talks real CDC ...
*/
dev_warn (&gadget->dev, "set_interface ignored!\n");
#endif /* DEV_CONFIG_CDC */
done_set_intf:
spin_unlock (&dev->lock);
break;
case USB_REQ_GET_INTERFACE:
if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
|| !dev->config
|| wIndex > 1)
break;
if (!(cdc_active(dev) || rndis_active(dev)) && wIndex != 0)
break;
/* for CDC, iff carrier is on, data interface is active. */
if (rndis_active(dev) || wIndex != 1)
*(u8 *)req->buf = 0;
else
*(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0;
value = min (wLength, (u16) 1);
break;
#ifdef DEV_CONFIG_CDC
case USB_CDC_SET_ETHERNET_PACKET_FILTER:
/* see 6.2.30: no data, wIndex = interface,
* wValue = packet filter bitmap
*/
if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
|| !cdc_active(dev)
|| wLength != 0
|| wIndex > 1)
break;
DEBUG (dev, "packet filter %02x\n", wValue);
dev->cdc_filter = wValue;
value = 0;
break;
/* and potentially:
* case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
* case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_STATISTIC:
*/
#endif /* DEV_CONFIG_CDC */
#ifdef CONFIG_USB_ETH_RNDIS
/* RNDIS uses the CDC command encapsulation mechanism to implement
* an RPC scheme, with much getting/setting of attributes by OID.
*/
case USB_CDC_SEND_ENCAPSULATED_COMMAND:
if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
|| !rndis_active(dev)
|| wLength > USB_BUFSIZ
|| wValue
|| rndis_control_intf.bInterfaceNumber
!= wIndex)
break;
/* read the request, then process it */
value = wLength;
req->complete = rndis_command_complete;
/* later, rndis_control_ack () sends a notification */
break;
case USB_CDC_GET_ENCAPSULATED_RESPONSE:
if ((USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE)
== ctrl->bRequestType
&& rndis_active(dev)
// && wLength >= 0x0400
&& !wValue
&& rndis_control_intf.bInterfaceNumber
== wIndex) {
u8 *buf;
/* return the result */
buf = rndis_get_next_response (dev->rndis_config,
&value);
if (buf) {
memcpy (req->buf, buf, value);
req->complete = rndis_response_complete;
rndis_free_response(dev->rndis_config, buf);
}
/* else stalls ... spec says to avoid that */
}
break;
#endif /* RNDIS */
default:
VDEBUG (dev,
"unknown control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
wValue, wIndex, wLength);
}
/* respond with data transfer before status phase? */
if (value >= 0) {
req->length = value;
req->zero = value < wLength
&& (value % gadget->ep0->maxpacket) == 0;
value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
if (value < 0) {
DEBUG (dev, "ep_queue --> %d\n", value);
req->status = 0;
eth_setup_complete (gadget->ep0, req);
}
}
/* host either stalls (value < 0) or reports success */
return value;
}
static void
eth_disconnect (struct usb_gadget *gadget)
{
struct eth_dev *dev = get_gadget_data (gadget);
unsigned long flags;
spin_lock_irqsave (&dev->lock, flags);
netif_stop_queue (dev->net);
netif_carrier_off (dev->net);
eth_reset_config (dev);
spin_unlock_irqrestore (&dev->lock, flags);
/* FIXME RNDIS should enter RNDIS_UNINITIALIZED */
/* next we may get setup() calls to enumerate new connections;
* or an unbind() during shutdown (including removing module).
*/
}
/*-------------------------------------------------------------------------*/
/* NETWORK DRIVER HOOKUP (to the layer above this driver) */
static int eth_change_mtu (struct net_device *net, int new_mtu)
{
struct eth_dev *dev = netdev_priv(net);
if (dev->rndis)
return -EBUSY;
if (new_mtu <= ETH_HLEN || new_mtu > ETH_FRAME_LEN)
return -ERANGE;
/* no zero-length packet read wanted after mtu-sized packets */
if (((new_mtu + sizeof (struct ethhdr)) % dev->in_ep->maxpacket) == 0)
return -EDOM;
net->mtu = new_mtu;
return 0;
}
static struct net_device_stats *eth_get_stats (struct net_device *net)
{
return &((struct eth_dev *)netdev_priv(net))->stats;
}
static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
{
struct eth_dev *dev = netdev_priv(net);
strlcpy(p->driver, shortname, sizeof p->driver);
strlcpy(p->version, DRIVER_VERSION, sizeof p->version);
strlcpy(p->fw_version, dev->gadget->name, sizeof p->fw_version);
strlcpy (p->bus_info, dev->gadget->dev.bus_id, sizeof p->bus_info);
}
static u32 eth_get_link(struct net_device *net)
{
struct eth_dev *dev = netdev_priv(net);
return dev->gadget->speed != USB_SPEED_UNKNOWN;
}
static struct ethtool_ops ops = {
.get_drvinfo = eth_get_drvinfo,
.get_link = eth_get_link
};
static void defer_kevent (struct eth_dev *dev, int flag)
{
if (test_and_set_bit (flag, &dev->todo))
return;
if (!schedule_work (&dev->work))
ERROR (dev, "kevent %d may have been dropped\n", flag);
else
DEBUG (dev, "kevent %d scheduled\n", flag);
}
static void rx_complete (struct usb_ep *ep, struct usb_request *req);
static int
rx_submit (struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
{
struct sk_buff *skb;
int retval = -ENOMEM;
size_t size;
/* Padding up to RX_EXTRA handles minor disagreements with host.
* Normally we use the USB "terminate on short read" convention;
* so allow up to (N*maxpacket), since that memory is normally
* already allocated. Some hardware doesn't deal well with short
* reads (e.g. DMA must be N*maxpacket), so for now don't trim a
* byte off the end (to force hardware errors on overflow).
*
* RNDIS uses internal framing, and explicitly allows senders to
* pad to end-of-packet. That's potentially nice for speed,
* but means receivers can't recover synch on their own.
*/
size = (sizeof (struct ethhdr) + dev->net->mtu + RX_EXTRA);
size += dev->out_ep->maxpacket - 1;
if (rndis_active(dev))
size += sizeof (struct rndis_packet_msg_type);
size -= size % dev->out_ep->maxpacket;
if ((skb = alloc_skb (size + NET_IP_ALIGN, gfp_flags)) == 0) {
DEBUG (dev, "no rx skb\n");
goto enomem;
}
/* Some platforms perform better when IP packets are aligned,
* but on at least one, checksumming fails otherwise. Note:
* RNDIS headers involve variable numbers of LE32 values.
*/
skb_reserve(skb, NET_IP_ALIGN);
req->buf = skb->data;
req->length = size;
req->complete = rx_complete;
req->context = skb;
retval = usb_ep_queue (dev->out_ep, req, gfp_flags);
if (retval == -ENOMEM)
enomem:
defer_kevent (dev, WORK_RX_MEMORY);
if (retval) {
DEBUG (dev, "rx submit --> %d\n", retval);
if (skb)
dev_kfree_skb_any(skb);
spin_lock(&dev->req_lock);
list_add (&req->list, &dev->rx_reqs);
spin_unlock(&dev->req_lock);
}
return retval;
}
static void rx_complete (struct usb_ep *ep, struct usb_request *req)
{
struct sk_buff *skb = req->context;
struct eth_dev *dev = ep->driver_data;
int status = req->status;
switch (status) {
/* normal completion */
case 0:
skb_put (skb, req->actual);
/* we know MaxPacketsPerTransfer == 1 here */
if (rndis_active(dev))
status = rndis_rm_hdr (skb);
if (status < 0
|| ETH_HLEN > skb->len
|| skb->len > ETH_FRAME_LEN) {
dev->stats.rx_errors++;
dev->stats.rx_length_errors++;
DEBUG (dev, "rx length %d\n", skb->len);
break;
}
skb->protocol = eth_type_trans (skb, dev->net);
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
/* no buffer copies needed, unless hardware can't
* use skb buffers.
*/
status = netif_rx (skb);
skb = NULL;
break;
/* software-driven interface shutdown */
case -ECONNRESET: // unlink
case -ESHUTDOWN: // disconnect etc
VDEBUG (dev, "rx shutdown, code %d\n", status);
goto quiesce;
/* for hardware automagic (such as pxa) */
case -ECONNABORTED: // endpoint reset
DEBUG (dev, "rx %s reset\n", ep->name);
defer_kevent (dev, WORK_RX_MEMORY);
quiesce:
dev_kfree_skb_any (skb);
goto clean;
/* data overrun */
case -EOVERFLOW:
dev->stats.rx_over_errors++;
// FALLTHROUGH
default:
dev->stats.rx_errors++;
DEBUG (dev, "rx status %d\n", status);
break;
}
if (skb)
dev_kfree_skb_any (skb);
if (!netif_running (dev->net)) {
clean:
spin_lock(&dev->req_lock);
list_add (&req->list, &dev->rx_reqs);
spin_unlock(&dev->req_lock);
req = NULL;
}
if (req)
rx_submit (dev, req, GFP_ATOMIC);
}
static int prealloc (struct list_head *list, struct usb_ep *ep,
unsigned n, gfp_t gfp_flags)
{
unsigned i;
struct usb_request *req;
if (!n)
return -ENOMEM;
/* queue/recycle up to N requests */
i = n;
list_for_each_entry (req, list, list) {
if (i-- == 0)
goto extra;
}
while (i--) {
req = usb_ep_alloc_request (ep, gfp_flags);
if (!req)
return list_empty (list) ? -ENOMEM : 0;
list_add (&req->list, list);
}
return 0;
extra:
/* free extras */
for (;;) {
struct list_head *next;
next = req->list.next;
list_del (&req->list);
usb_ep_free_request (ep, req);
if (next == list)
break;
req = container_of (next, struct usb_request, list);
}
return 0;
}
static int alloc_requests (struct eth_dev *dev, unsigned n, gfp_t gfp_flags)
{
int status;
spin_lock(&dev->req_lock);
status = prealloc (&dev->tx_reqs, dev->in_ep, n, gfp_flags);
if (status < 0)
goto fail;
status = prealloc (&dev->rx_reqs, dev->out_ep, n, gfp_flags);
if (status < 0)
goto fail;
goto done;
fail:
DEBUG (dev, "can't alloc requests\n");
done:
spin_unlock(&dev->req_lock);
return status;
}
static void rx_fill (struct eth_dev *dev, gfp_t gfp_flags)
{
struct usb_request *req;
unsigned long flags;
/* fill unused rxq slots with some skb */
spin_lock_irqsave(&dev->req_lock, flags);
while (!list_empty (&dev->rx_reqs)) {
req = container_of (dev->rx_reqs.next,
struct usb_request, list);
list_del_init (&req->list);
spin_unlock_irqrestore(&dev->req_lock, flags);
if (rx_submit (dev, req, gfp_flags) < 0) {
defer_kevent (dev, WORK_RX_MEMORY);
return;
}
spin_lock_irqsave(&dev->req_lock, flags);
}
spin_unlock_irqrestore(&dev->req_lock, flags);
}
static void eth_work (struct work_struct *work)
{
struct eth_dev *dev = container_of(work, struct eth_dev, work);
if (test_and_clear_bit (WORK_RX_MEMORY, &dev->todo)) {
if (netif_running (dev->net))
rx_fill (dev, GFP_KERNEL);
}
if (dev->todo)
DEBUG (dev, "work done, flags = 0x%lx\n", dev->todo);
}
static void tx_complete (struct usb_ep *ep, struct usb_request *req)
{
struct sk_buff *skb = req->context;
struct eth_dev *dev = ep->driver_data;
switch (req->status) {
default:
dev->stats.tx_errors++;
VDEBUG (dev, "tx err %d\n", req->status);
/* FALLTHROUGH */
case -ECONNRESET: // unlink
case -ESHUTDOWN: // disconnect etc
break;
case 0:
dev->stats.tx_bytes += skb->len;
}
dev->stats.tx_packets++;
spin_lock(&dev->req_lock);
list_add (&req->list, &dev->tx_reqs);
spin_unlock(&dev->req_lock);
dev_kfree_skb_any (skb);
atomic_dec (&dev->tx_qlen);
if (netif_carrier_ok (dev->net))
netif_wake_queue (dev->net);
}
static inline int eth_is_promisc (struct eth_dev *dev)
{
/* no filters for the CDC subset; always promisc */
if (subset_active (dev))
return 1;
return dev->cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
}
static int eth_start_xmit (struct sk_buff *skb, struct net_device *net)
{
struct eth_dev *dev = netdev_priv(net);
int length = skb->len;
int retval;
struct usb_request *req = NULL;
unsigned long flags;
/* apply outgoing CDC or RNDIS filters */
if (!eth_is_promisc (dev)) {
u8 *dest = skb->data;
if (is_multicast_ether_addr(dest)) {
u16 type;
/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
* SET_ETHERNET_MULTICAST_FILTERS requests
*/
if (is_broadcast_ether_addr(dest))
type = USB_CDC_PACKET_TYPE_BROADCAST;
else
type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
if (!(dev->cdc_filter & type)) {
dev_kfree_skb_any (skb);
return 0;
}
}
/* ignores USB_CDC_PACKET_TYPE_DIRECTED */
}
spin_lock_irqsave(&dev->req_lock, flags);
req = container_of (dev->tx_reqs.next, struct usb_request, list);
list_del (&req->list);
if (list_empty (&dev->tx_reqs))
netif_stop_queue (net);
spin_unlock_irqrestore(&dev->req_lock, flags);
/* no buffer copies needed, unless the network stack did it
* or the hardware can't use skb buffers.
* or there's not enough space for any RNDIS headers we need
*/
if (rndis_active(dev)) {
struct sk_buff *skb_rndis;
skb_rndis = skb_realloc_headroom (skb,
sizeof (struct rndis_packet_msg_type));
if (!skb_rndis)
goto drop;
dev_kfree_skb_any (skb);
skb = skb_rndis;
rndis_add_hdr (skb);
length = skb->len;
}
req->buf = skb->data;
req->context = skb;
req->complete = tx_complete;
/* use zlp framing on tx for strict CDC-Ether conformance,
* though any robust network rx path ignores extra padding.
* and some hardware doesn't like to write zlps.
*/
req->zero = 1;
if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
length++;
req->length = length;
#ifdef CONFIG_USB_GADGET_DUALSPEED
/* throttle highspeed IRQ rate back slightly */
req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
? ((atomic_read (&dev->tx_qlen) % TX_DELAY) != 0)
: 0;
#endif
retval = usb_ep_queue (dev->in_ep, req, GFP_ATOMIC);
switch (retval) {
default:
DEBUG (dev, "tx queue err %d\n", retval);
break;
case 0:
net->trans_start = jiffies;
atomic_inc (&dev->tx_qlen);
}
if (retval) {
drop:
dev->stats.tx_dropped++;
dev_kfree_skb_any (skb);
spin_lock_irqsave(&dev->req_lock, flags);
if (list_empty (&dev->tx_reqs))
netif_start_queue (net);
list_add (&req->list, &dev->tx_reqs);
spin_unlock_irqrestore(&dev->req_lock, flags);
}
return 0;
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_ETH_RNDIS
/* The interrupt endpoint is used in RNDIS to notify the host when messages
* other than data packets are available ... notably the REMOTE_NDIS_*_CMPLT
* messages, but also REMOTE_NDIS_INDICATE_STATUS_MSG and potentially even
* REMOTE_NDIS_KEEPALIVE_MSG.
*
* The RNDIS control queue is processed by GET_ENCAPSULATED_RESPONSE, and
* normally just one notification will be queued.
*/
static struct usb_request *eth_req_alloc (struct usb_ep *, unsigned, gfp_t);
static void eth_req_free (struct usb_ep *ep, struct usb_request *req);
static void
rndis_control_ack_complete (struct usb_ep *ep, struct usb_request *req)
{
struct eth_dev *dev = ep->driver_data;
if (req->status || req->actual != req->length)
DEBUG (dev,
"rndis control ack complete --> %d, %d/%d\n",
req->status, req->actual, req->length);
req->context = NULL;
if (req != dev->stat_req)
eth_req_free(ep, req);
}
static int rndis_control_ack (struct net_device *net)
{
struct eth_dev *dev = netdev_priv(net);
int length;
struct usb_request *resp = dev->stat_req;
/* in case RNDIS calls this after disconnect */
if (!dev->status) {
DEBUG (dev, "status ENODEV\n");
return -ENODEV;
}
/* in case queue length > 1 */
if (resp->context) {
resp = eth_req_alloc (dev->status_ep, 8, GFP_ATOMIC);
if (!resp)
return -ENOMEM;
}
/* Send RNDIS RESPONSE_AVAILABLE notification;
* USB_CDC_NOTIFY_RESPONSE_AVAILABLE should work too
*/
resp->length = 8;
resp->complete = rndis_control_ack_complete;
resp->context = dev;
*((__le32 *) resp->buf) = __constant_cpu_to_le32 (1);
*((__le32 *) resp->buf + 1) = __constant_cpu_to_le32 (0);
length = usb_ep_queue (dev->status_ep, resp, GFP_ATOMIC);
if (length < 0) {
resp->status = 0;
rndis_control_ack_complete (dev->status_ep, resp);
}
return 0;
}
#else
#define rndis_control_ack NULL
#endif /* RNDIS */
static void eth_start (struct eth_dev *dev, gfp_t gfp_flags)
{
DEBUG (dev, "%s\n", __FUNCTION__);
/* fill the rx queue */
rx_fill (dev, gfp_flags);
/* and open the tx floodgates */
atomic_set (&dev->tx_qlen, 0);
netif_wake_queue (dev->net);
if (rndis_active(dev)) {
rndis_set_param_medium (dev->rndis_config,
NDIS_MEDIUM_802_3,
BITRATE(dev->gadget)/100);
(void) rndis_signal_connect (dev->rndis_config);
}
}
static int eth_open (struct net_device *net)
{
struct eth_dev *dev = netdev_priv(net);
DEBUG (dev, "%s\n", __FUNCTION__);
if (netif_carrier_ok (dev->net))
eth_start (dev, GFP_KERNEL);
return 0;
}
static int eth_stop (struct net_device *net)
{
struct eth_dev *dev = netdev_priv(net);
VDEBUG (dev, "%s\n", __FUNCTION__);
netif_stop_queue (net);
DEBUG (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
dev->stats.rx_packets, dev->stats.tx_packets,
dev->stats.rx_errors, dev->stats.tx_errors
);
/* ensure there are no more active requests */
if (dev->config) {
usb_ep_disable (dev->in_ep);
usb_ep_disable (dev->out_ep);
if (netif_carrier_ok (dev->net)) {
DEBUG (dev, "host still using in/out endpoints\n");
// FIXME idiom may leave toggle wrong here
usb_ep_enable (dev->in_ep, dev->in);
usb_ep_enable (dev->out_ep, dev->out);
}
if (dev->status_ep) {
usb_ep_disable (dev->status_ep);
usb_ep_enable (dev->status_ep, dev->status);
}
}
if (rndis_active(dev)) {
rndis_set_param_medium (dev->rndis_config,
NDIS_MEDIUM_802_3, 0);
(void) rndis_signal_disconnect (dev->rndis_config);
}
return 0;
}
/*-------------------------------------------------------------------------*/
static struct usb_request *
eth_req_alloc (struct usb_ep *ep, unsigned size, gfp_t gfp_flags)
{
struct usb_request *req;
req = usb_ep_alloc_request (ep, gfp_flags);
if (!req)
return NULL;
req->buf = kmalloc (size, gfp_flags);
if (!req->buf) {
usb_ep_free_request (ep, req);
req = NULL;
}
return req;
}
static void
eth_req_free (struct usb_ep *ep, struct usb_request *req)
{
kfree (req->buf);
usb_ep_free_request (ep, req);
}
static void /* __init_or_exit */
eth_unbind (struct usb_gadget *gadget)
{
struct eth_dev *dev = get_gadget_data (gadget);
DEBUG (dev, "unbind\n");
rndis_deregister (dev->rndis_config);
rndis_exit ();
/* we've already been disconnected ... no i/o is active */
if (dev->req) {
eth_req_free (gadget->ep0, dev->req);
dev->req = NULL;
}
if (dev->stat_req) {
eth_req_free (dev->status_ep, dev->stat_req);
dev->stat_req = NULL;
}
unregister_netdev (dev->net);
free_netdev(dev->net);
/* assuming we used keventd, it must quiesce too */
flush_scheduled_work ();
set_gadget_data (gadget, NULL);
}
static u8 __devinit nibble (unsigned char c)
{
if (likely (isdigit (c)))
return c - '0';
c = toupper (c);
if (likely (isxdigit (c)))
return 10 + c - 'A';
return 0;
}
static int __devinit get_ether_addr(const char *str, u8 *dev_addr)
{
if (str) {
unsigned i;
for (i = 0; i < 6; i++) {
unsigned char num;
if((*str == '.') || (*str == ':'))
str++;
num = nibble(*str++) << 4;
num |= (nibble(*str++));
dev_addr [i] = num;
}
if (is_valid_ether_addr (dev_addr))
return 0;
}
random_ether_addr(dev_addr);
return 1;
}
static int __devinit
eth_bind (struct usb_gadget *gadget)
{
struct eth_dev *dev;
struct net_device *net;
u8 cdc = 1, zlp = 1, rndis = 1;
struct usb_ep *in_ep, *out_ep, *status_ep = NULL;
int status = -ENOMEM;
int gcnum;
/* these flags are only ever cleared; compiler take note */
#ifndef DEV_CONFIG_CDC
cdc = 0;
#endif
#ifndef CONFIG_USB_ETH_RNDIS
rndis = 0;
#endif
/* Because most host side USB stacks handle CDC Ethernet, that
* standard protocol is _strongly_ preferred for interop purposes.
* (By everyone except Microsoft.)
*/
if (gadget_is_pxa (gadget)) {
/* pxa doesn't support altsettings */
cdc = 0;
} else if (gadget_is_musbhdrc(gadget)) {
/* reduce tx dma overhead by avoiding special cases */
zlp = 0;
} else if (gadget_is_sh(gadget)) {
/* sh doesn't support multiple interfaces or configs */
cdc = 0;
rndis = 0;
} else if (gadget_is_sa1100 (gadget)) {
/* hardware can't write zlps */
zlp = 0;
/* sa1100 CAN do CDC, without status endpoint ... we use
* non-CDC to be compatible with ARM Linux-2.4 "usb-eth".
*/
cdc = 0;
}
gcnum = usb_gadget_controller_number (gadget);
if (gcnum >= 0)
device_desc.bcdDevice = cpu_to_le16 (0x0200 + gcnum);
else {
/* can't assume CDC works. don't want to default to
* anything less functional on CDC-capable hardware,
* so we fail in this case.
*/
dev_err (&gadget->dev,
"controller '%s' not recognized\n",
gadget->name);
return -ENODEV;
}
snprintf (manufacturer, sizeof manufacturer, "%s %s/%s",
init_utsname()->sysname, init_utsname()->release,
gadget->name);
/* If there's an RNDIS configuration, that's what Windows wants to
* be using ... so use these product IDs here and in the "linux.inf"
* needed to install MSFT drivers. Current Linux kernels will use
* the second configuration if it's CDC Ethernet, and need some help
* to choose the right configuration otherwise.
*/
if (rndis) {
device_desc.idVendor =
__constant_cpu_to_le16(RNDIS_VENDOR_NUM);
device_desc.idProduct =
__constant_cpu_to_le16(RNDIS_PRODUCT_NUM);
snprintf (product_desc, sizeof product_desc,
"RNDIS/%s", driver_desc);
/* CDC subset ... recognized by Linux since 2.4.10, but Windows
* drivers aren't widely available. (That may be improved by
* supporting one submode of the "SAFE" variant of MDLM.)
*/
} else if (!cdc) {
device_desc.idVendor =
__constant_cpu_to_le16(SIMPLE_VENDOR_NUM);
device_desc.idProduct =
__constant_cpu_to_le16(SIMPLE_PRODUCT_NUM);
}
/* support optional vendor/distro customization */
if (idVendor) {
if (!idProduct) {
dev_err (&gadget->dev, "idVendor needs idProduct!\n");
return -ENODEV;
}
device_desc.idVendor = cpu_to_le16(idVendor);
device_desc.idProduct = cpu_to_le16(idProduct);
if (bcdDevice)
device_desc.bcdDevice = cpu_to_le16(bcdDevice);
}
if (iManufacturer)
strlcpy (manufacturer, iManufacturer, sizeof manufacturer);
if (iProduct)
strlcpy (product_desc, iProduct, sizeof product_desc);
if (iSerialNumber) {
device_desc.iSerialNumber = STRING_SERIALNUMBER,
strlcpy(serial_number, iSerialNumber, sizeof serial_number);
}
/* all we really need is bulk IN/OUT */
usb_ep_autoconfig_reset (gadget);
in_ep = usb_ep_autoconfig (gadget, &fs_source_desc);
if (!in_ep) {
autoconf_fail:
dev_err (&gadget->dev,
"can't autoconfigure on %s\n",
gadget->name);
return -ENODEV;
}
in_ep->driver_data = in_ep; /* claim */
out_ep = usb_ep_autoconfig (gadget, &fs_sink_desc);
if (!out_ep)
goto autoconf_fail;
out_ep->driver_data = out_ep; /* claim */
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
/* CDC Ethernet control interface doesn't require a status endpoint.
* Since some hosts expect one, try to allocate one anyway.
*/
if (cdc || rndis) {
status_ep = usb_ep_autoconfig (gadget, &fs_status_desc);
if (status_ep) {
status_ep->driver_data = status_ep; /* claim */
} else if (rndis) {
dev_err (&gadget->dev,
"can't run RNDIS on %s\n",
gadget->name);
return -ENODEV;
#ifdef DEV_CONFIG_CDC
/* pxa25x only does CDC subset; often used with RNDIS */
} else if (cdc) {
control_intf.bNumEndpoints = 0;
/* FIXME remove endpoint from descriptor list */
#endif
}
}
#endif
/* one config: cdc, else minimal subset */
if (!cdc) {
eth_config.bNumInterfaces = 1;
eth_config.iConfiguration = STRING_SUBSET;
/* use functions to set these up, in case we're built to work
* with multiple controllers and must override CDC Ethernet.
*/
fs_subset_descriptors();
hs_subset_descriptors();
}
device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
usb_gadget_set_selfpowered (gadget);
/* For now RNDIS is always a second config */
if (rndis)
device_desc.bNumConfigurations = 2;
#ifdef CONFIG_USB_GADGET_DUALSPEED
if (rndis)
dev_qualifier.bNumConfigurations = 2;
else if (!cdc)
dev_qualifier.bDeviceClass = USB_CLASS_VENDOR_SPEC;
/* assumes ep0 uses the same value for both speeds ... */
dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
/* and that all endpoints are dual-speed */
hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
if (status_ep)
hs_status_desc.bEndpointAddress =
fs_status_desc.bEndpointAddress;
#endif
#endif /* DUALSPEED */
if (gadget->is_otg) {
otg_descriptor.bmAttributes |= USB_OTG_HNP,
eth_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
eth_config.bMaxPower = 4;
#ifdef CONFIG_USB_ETH_RNDIS
rndis_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
rndis_config.bMaxPower = 4;
#endif
}
net = alloc_etherdev (sizeof *dev);
if (!net)
return status;
dev = netdev_priv(net);
spin_lock_init (&dev->lock);
spin_lock_init (&dev->req_lock);
INIT_WORK (&dev->work, eth_work);
INIT_LIST_HEAD (&dev->tx_reqs);
INIT_LIST_HEAD (&dev->rx_reqs);
/* network device setup */
dev->net = net;
SET_MODULE_OWNER (net);
strcpy (net->name, "usb%d");
dev->cdc = cdc;
dev->zlp = zlp;
dev->in_ep = in_ep;
dev->out_ep = out_ep;
dev->status_ep = status_ep;
/* Module params for these addresses should come from ID proms.
* The host side address is used with CDC and RNDIS, and commonly
* ends up in a persistent config database. It's not clear if
* host side code for the SAFE thing cares -- its original BLAN
* thing didn't, Sharp never assigned those addresses on Zaurii.
*/
if (get_ether_addr(dev_addr, net->dev_addr))
dev_warn(&gadget->dev,
"using random %s ethernet address\n", "self");
if (get_ether_addr(host_addr, dev->host_mac))
dev_warn(&gadget->dev,
"using random %s ethernet address\n", "host");
snprintf (ethaddr, sizeof ethaddr, "%02X%02X%02X%02X%02X%02X",
dev->host_mac [0], dev->host_mac [1],
dev->host_mac [2], dev->host_mac [3],
dev->host_mac [4], dev->host_mac [5]);
if (rndis) {
status = rndis_init();
if (status < 0) {
dev_err (&gadget->dev, "can't init RNDIS, %d\n",
status);
goto fail;
}
}
net->change_mtu = eth_change_mtu;
net->get_stats = eth_get_stats;
net->hard_start_xmit = eth_start_xmit;
net->open = eth_open;
net->stop = eth_stop;
// watchdog_timeo, tx_timeout ...
// set_multicast_list
SET_ETHTOOL_OPS(net, &ops);
/* preallocate control message data and buffer */
dev->req = eth_req_alloc (gadget->ep0, USB_BUFSIZ, GFP_KERNEL);
if (!dev->req)
goto fail;
dev->req->complete = eth_setup_complete;
/* ... and maybe likewise for status transfer */
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
if (dev->status_ep) {
dev->stat_req = eth_req_alloc (dev->status_ep,
STATUS_BYTECOUNT, GFP_KERNEL);
if (!dev->stat_req) {
eth_req_free (gadget->ep0, dev->req);
goto fail;
}
dev->stat_req->context = NULL;
}
#endif
/* finish hookup to lower layer ... */
dev->gadget = gadget;
set_gadget_data (gadget, dev);
gadget->ep0->driver_data = dev;
/* two kinds of host-initiated state changes:
* - iff DATA transfer is active, carrier is "on"
* - tx queueing enabled if open *and* carrier is "on"
*/
netif_stop_queue (dev->net);
netif_carrier_off (dev->net);
SET_NETDEV_DEV (dev->net, &gadget->dev);
status = register_netdev (dev->net);
if (status < 0)
goto fail1;
INFO (dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
INFO (dev, "using %s, OUT %s IN %s%s%s\n", gadget->name,
out_ep->name, in_ep->name,
status_ep ? " STATUS " : "",
status_ep ? status_ep->name : ""
);
INFO (dev, "MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
net->dev_addr [0], net->dev_addr [1],
net->dev_addr [2], net->dev_addr [3],
net->dev_addr [4], net->dev_addr [5]);
if (cdc || rndis)
INFO (dev, "HOST MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
dev->host_mac [0], dev->host_mac [1],
dev->host_mac [2], dev->host_mac [3],
dev->host_mac [4], dev->host_mac [5]);
if (rndis) {
u32 vendorID = 0;
/* FIXME RNDIS vendor id == "vendor NIC code" == ? */
dev->rndis_config = rndis_register (rndis_control_ack);
if (dev->rndis_config < 0) {
fail0:
unregister_netdev (dev->net);
status = -ENODEV;
goto fail;
}
/* these set up a lot of the OIDs that RNDIS needs */
rndis_set_host_mac (dev->rndis_config, dev->host_mac);
if (rndis_set_param_dev (dev->rndis_config, dev->net,
&dev->stats, &dev->cdc_filter))
goto fail0;
if (rndis_set_param_vendor (dev->rndis_config, vendorID,
manufacturer))
goto fail0;
if (rndis_set_param_medium (dev->rndis_config,
NDIS_MEDIUM_802_3,
0))
goto fail0;
INFO (dev, "RNDIS ready\n");
}
return status;
fail1:
dev_dbg(&gadget->dev, "register_netdev failed, %d\n", status);
fail:
eth_unbind (gadget);
return status;
}
/*-------------------------------------------------------------------------*/
static void
eth_suspend (struct usb_gadget *gadget)
{
struct eth_dev *dev = get_gadget_data (gadget);
DEBUG (dev, "suspend\n");
dev->suspended = 1;
}
static void
eth_resume (struct usb_gadget *gadget)
{
struct eth_dev *dev = get_gadget_data (gadget);
DEBUG (dev, "resume\n");
dev->suspended = 0;
}
/*-------------------------------------------------------------------------*/
static struct usb_gadget_driver eth_driver = {
.speed = DEVSPEED,
.function = (char *) driver_desc,
.bind = eth_bind,
.unbind = eth_unbind,
.setup = eth_setup,
.disconnect = eth_disconnect,
.suspend = eth_suspend,
.resume = eth_resume,
.driver = {
.name = (char *) shortname,
.owner = THIS_MODULE,
},
};
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_AUTHOR ("David Brownell, Benedikt Spanger");
MODULE_LICENSE ("GPL");
static int __init init (void)
{
return usb_gadget_register_driver (&eth_driver);
}
module_init (init);
static void __exit cleanup (void)
{
usb_gadget_unregister_driver (&eth_driver);
}
module_exit (cleanup);