patch-2.4.10 linux/drivers/usb/usbnet.c
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- Lines: 1569
- Date:
Fri Sep 14 14:04:07 2001
- Orig file:
v2.4.9/linux/drivers/usb/usbnet.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/drivers/usb/usbnet.c linux/drivers/usb/usbnet.c
@@ -0,0 +1,1568 @@
+/*
+ * USB Host-to-Host Links
+ * Copyright (C) 2000-2001 by David Brownell <dbrownell@users.sourceforge.net>
+ */
+
+/*
+ * This is used for "USB networking", connecting USB hosts as peers.
+ *
+ * It can be used with USB "network cables", for IP-over-USB communications;
+ * Ethernet speeds without the Ethernet. USB devices (including some PDAs)
+ * can support such links directly, replacing device-specific protocols
+ * with Internet standard ones.
+ *
+ * The links can be bridged using the Ethernet bridging (net/bridge)
+ * support as appropriate. Devices currently supported include:
+ *
+ * - AnchorChip 2720
+ * - Belkin F5U104 (custom)
+ * - "Linux Devices" (like iPaq and similar SA-1100 based PDAs)
+ * - NetChip 1080 (interoperates with NetChip Win32 drivers)
+ * - Prolific PL-2301/2302 (replaces "plusb" driver)
+ *
+ * USB devices can implement their side of this protocol at the cost
+ * of two bulk endpoints; it's not restricted to "cable" applications.
+ * See the LINUXDEV support.
+ *
+ *
+ * TODO:
+ *
+ * This needs to be retested for bulk queuing problems ... earlier versions
+ * seemed to find different types of problems in each HCD. Once they're fixed,
+ * re-enable queues to get higher bandwidth utilization (without needing
+ * to tweak MTU for larger packets).
+ *
+ * Add support for more "network cable" chips; interop with their Win32
+ * drivers may be a good thing. Test the AnchorChip 2720 support..
+ * Figure out the initialization protocol used by the Prolific chips,
+ * for better robustness ... there's some powerup/reset handshake that's
+ * needed when only one end reboots.
+ *
+ * Use interrupt on PL230x to detect peer connect/disconnect, and call
+ * netif_carrier_{on,off} (?) appropriately. For Net1080, detect peer
+ * connect/disconnect with async control messages.
+ *
+ * Find some way to report "peer connected" network hotplug events; it'll
+ * likely mean updating the networking layer. (This has been discussed
+ * on the netdev list...)
+ *
+ * Craft smarter hotplug policy scripts ... ones that know how to arrange
+ * bridging with "brctl", and can handle static and dynamic ("pump") setups.
+ * Use those "peer connected" events.
+ *
+ *
+ * CHANGELOG:
+ *
+ * 13-sep-2000 experimental, new
+ * 10-oct-2000 usb_device_id table created.
+ * 28-oct-2000 misc fixes; mostly, discard more TTL-mangled rx packets.
+ * 01-nov-2000 usb_device_id table and probing api update by
+ * Adam J. Richter <adam@yggdrasil.com>.
+ * 18-dec-2000 (db) tx watchdog, "net1080" renaming to "usbnet", device_info
+ * and prolific support, isolate net1080-specific bits, cleanup.
+ * fix unlink_urbs oops in D3 PM resume code path.
+ * 02-feb-2001 (db) fix tx skb sharing, packet length, match_flags, ...
+ * 08-feb-2001 stubbed in "linuxdev", maybe the SA-1100 folk can use it;
+ * AnchorChips 2720 support (from spec) for testing;
+ * fix bit-ordering problem with ethernet multicast addr
+ * 19-feb-2001 Support for clearing halt conditions. SA1100 UDC support
+ * updates. Oleg Drokin (green@iXcelerator.com)
+ * 25-mar-2001 More SA-1100 updates, including workaround for ip problem
+ * expecting cleared skb->cb and framing change to match latest
+ * handhelds.org version (Oleg). Enable device IDs from the
+ * Win32 Belkin driver; other cleanups (db).
+ * 16-jul-2001 Bugfixes for uhci oops-on-unplug, Belkin support, various
+ * cleanups for problems not yet seen in the field. (db)
+ *
+ *-------------------------------------------------------------------------*/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/random.h>
+#include <asm/unaligned.h>
+
+// #define DEBUG // error path messages, extra info
+// #define VERBOSE // more; success messages
+// #define REALLY_QUEUE
+
+#if !defined (DEBUG) && defined (CONFIG_USB_DEBUG)
+# define DEBUG
+#endif
+#include <linux/usb.h>
+
+
+#define CONFIG_USB_AN2720
+#define CONFIG_USB_BELKIN_F5U104
+#define CONFIG_USB_LINUXDEV
+#define CONFIG_USB_NET1080
+#define CONFIG_USB_PL2301
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
+ * Several dozen bytes of IPv4 data can fit in two such transactions.
+ * One maximum size Ethernet packet takes twenty four of them.
+ */
+#ifdef REALLY_QUEUE
+#define RX_QLEN 4
+#define TX_QLEN 4
+#else
+#define RX_QLEN 1
+#define TX_QLEN 1
+#endif
+
+// packets are always ethernet inside
+// ... except they can be bigger (up to 64K with this framing)
+#define MIN_PACKET sizeof(struct ethhdr)
+#define MAX_PACKET 32768
+
+// reawaken network queue this soon after stopping; else watchdog barks
+#define TX_TIMEOUT_JIFFIES (5*HZ)
+
+// for vendor-specific control operations
+#define CONTROL_TIMEOUT_MS (500) /* msec */
+#define CONTROL_TIMEOUT_JIFFIES ((CONTROL_TIMEOUT_MS * HZ)/1000)
+
+// between wakeups
+#define UNLINK_TIMEOUT_JIFFIES ((3 /*ms*/ * HZ)/1000)
+
+/*-------------------------------------------------------------------------*/
+
+// list of all devices we manage
+static DECLARE_MUTEX (usbnet_mutex);
+static LIST_HEAD (usbnet_list);
+
+// randomly generated ethernet address
+static u8 node_id [ETH_ALEN];
+
+// state we keep for each device we handle
+struct usbnet {
+ // housekeeping
+ struct usb_device *udev;
+ struct driver_info *driver_info;
+ struct semaphore mutex;
+ struct list_head dev_list;
+ wait_queue_head_t *wait;
+
+ // protocol/interface state
+ struct net_device net;
+ struct net_device_stats stats;
+ u16 packet_id;
+
+ // various kinds of pending driver work
+ struct sk_buff_head rxq;
+ struct sk_buff_head txq;
+ struct sk_buff_head done;
+ struct tasklet_struct bh;
+ struct tq_struct ctrl_task;
+};
+
+// device-specific info used by the driver
+struct driver_info {
+ char *description;
+
+ int flags;
+#define FLAG_FRAMING 0x0001 /* guard against device dropouts */
+
+ /* reset device ... can sleep */
+ int (*reset)(struct usbnet *);
+
+ /* see if peer is connected ... can sleep */
+ int (*check_connect)(struct usbnet *);
+
+ // FIXME -- also an interrupt mechanism
+
+ /* framework currently "knows" bulk EPs talk packets */
+ int in; /* rx endpoint */
+ int out; /* tx endpoint */
+ int epsize;
+};
+
+#define EP_SIZE(usbnet) ((usbnet)->driver_info->epsize)
+
+// we record the state for each of our queued skbs
+enum skb_state {
+ illegal = 0,
+ tx_start, tx_done,
+ rx_start, rx_done, rx_cleanup
+};
+
+struct skb_data { // skb->cb is one of these
+ struct urb *urb;
+ struct usbnet *dev;
+ enum skb_state state;
+ size_t length;
+};
+
+
+#define mutex_lock(x) down(x)
+#define mutex_unlock(x) up(x)
+
+#define RUN_CONTEXT (in_irq () ? "in_irq" \
+ : (in_interrupt () ? "in_interrupt" : "can sleep"))
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef DEBUG
+#define devdbg(usbnet, fmt, arg...) \
+ printk(KERN_DEBUG "%s: " fmt "\n" , (usbnet)->net.name, ## arg)
+#else
+#define devdbg(usbnet, fmt, arg...) do {} while(0)
+#endif
+
+#define devinfo(usbnet, fmt, arg...) \
+ printk(KERN_INFO "%s: " fmt "\n" , (usbnet)->net.name, ## arg)
+
+/*-------------------------------------------------------------------------
+ *
+ * NetChip framing of ethernet packets, supporting additional error
+ * checks for links that may drop bulk packets from inside messages.
+ * Odd USB length == always short read for last usb packet.
+ * - nc_header
+ * - Ethernet header (14 bytes)
+ * - payload
+ * - (optional padding byte, if needed so length becomes odd)
+ * - nc_trailer
+ *
+ * This framing is to be avoided for non-NetChip devices.
+ */
+
+struct nc_header { // packed:
+ u16 hdr_len; // sizeof nc_header (LE, all)
+ u16 packet_len; // payload size (including ethhdr)
+ u16 packet_id; // detects dropped packets
+#define MIN_HEADER 6
+
+ // all else is optional, and must start with:
+ // u16 vendorId; // from usb-if
+ // u16 productId;
+} __attribute__((__packed__));
+
+#define PAD_BYTE ((unsigned char)0xAC)
+
+struct nc_trailer {
+ u16 packet_id;
+} __attribute__((__packed__));
+
+// packets may use FLAG_FRAMING and optional pad
+#define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \
+ + sizeof (struct ethhdr) \
+ + (mtu) \
+ + 1 \
+ + sizeof (struct nc_trailer))
+
+#define MIN_FRAMED FRAMED_SIZE(0)
+
+
+
+#ifdef CONFIG_USB_AN2720
+
+/*-------------------------------------------------------------------------
+ *
+ * AnchorChips 2720 driver ... http://www.cypress.com
+ *
+ * This doesn't seem to have a way to detect whether the peer is
+ * connected, or need any reset handshaking. It's got pretty big
+ * internal buffers (handles most of a frame's worth of data).
+ * Chip data sheets don't describe any vendor control messages.
+ *
+ *-------------------------------------------------------------------------*/
+
+static const struct driver_info an2720_info = {
+ description: "AnchorChips/Cypress 2720",
+ // no reset available!
+ // no check_connect available!
+
+ in: 2, out: 2, // direction distinguishes these
+ epsize: 64,
+};
+
+#endif /* CONFIG_USB_AN2720 */
+
+
+
+#ifdef CONFIG_USB_BELKIN_F5U104
+
+/*-------------------------------------------------------------------------
+ *
+ * Belkin F5U104 ... two NetChip 2280 devices + Atmel microcontroller
+ *
+ *-------------------------------------------------------------------------*/
+
+static const struct driver_info belkin_info = {
+ description: "Belkin USB Direct Connect (F5U104)",
+
+ in: 1, out: 1, // direction distinguishes these
+ epsize: 64,
+};
+
+#endif /* CONFIG_USB_BELKIN_F5U104 */
+
+
+
+#ifdef CONFIG_USB_LINUXDEV
+
+/*-------------------------------------------------------------------------
+ *
+ * This could talk to a device that uses Linux, such as a PDA or
+ * an embedded system, or in fact to any "smart" device using this
+ * particular mapping of USB and Ethernet.
+ *
+ * Such a Linux host would need a "USB Device Controller" hardware
+ * (not "USB Host Controller"), and a network driver talking to that
+ * hardware.
+ *
+ * One example is Intel's SA-1100 chip, which integrates basic USB
+ * support (arch/arm/sa1100/usb-eth.c); it's used in the iPaq PDA.
+ *
+ *-------------------------------------------------------------------------*/
+
+
+static const struct driver_info linuxdev_info = {
+ description: "Linux Device",
+ // no reset defined (yet?)
+ // no check_connect needed!
+ in: 2, out: 1,
+ epsize: 64,
+};
+
+#endif /* CONFIG_USB_LINUXDEV */
+
+
+
+#ifdef CONFIG_USB_NET1080
+
+/*-------------------------------------------------------------------------
+ *
+ * Netchip 1080 driver ... http://www.netchip.com
+ *
+ *-------------------------------------------------------------------------*/
+
+/*
+ * Zero means no timeout; else, how long a 64 byte bulk packet may be queued
+ * before the hardware drops it. If that's done, the driver will need to
+ * frame network packets to guard against the dropped USB packets. The win32
+ * driver sets this for both sides of the link.
+ */
+#define NC_READ_TTL_MS ((u8)255) // ms
+
+/*
+ * We ignore most registers and EEPROM contents.
+ */
+#define REG_USBCTL ((u8)0x04)
+#define REG_TTL ((u8)0x10)
+#define REG_STATUS ((u8)0x11)
+
+/*
+ * Vendor specific requests to read/write data
+ */
+#define REQUEST_REGISTER ((u8)0x10)
+#define REQUEST_EEPROM ((u8)0x11)
+
+static int
+nc_vendor_read (struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr)
+{
+ int status = usb_control_msg (dev->udev,
+ usb_rcvctrlpipe (dev->udev, 0),
+ req,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0, regnum,
+ retval_ptr, sizeof *retval_ptr,
+ CONTROL_TIMEOUT_JIFFIES);
+ if (status > 0)
+ status = 0;
+ if (!status)
+ le16_to_cpus (retval_ptr);
+ return status;
+}
+
+static inline int
+nc_register_read (struct usbnet *dev, u8 regnum, u16 *retval_ptr)
+{
+ return nc_vendor_read (dev, REQUEST_REGISTER, regnum, retval_ptr);
+}
+
+// no retval ... can become async, usable in_interrupt()
+static void
+nc_vendor_write (struct usbnet *dev, u8 req, u8 regnum, u16 value)
+{
+ usb_control_msg (dev->udev,
+ usb_sndctrlpipe (dev->udev, 0),
+ req,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ value, regnum,
+ 0, 0, // data is in setup packet
+ CONTROL_TIMEOUT_JIFFIES);
+}
+
+static inline void
+nc_register_write (struct usbnet *dev, u8 regnum, u16 value)
+{
+ nc_vendor_write (dev, REQUEST_REGISTER, regnum, value);
+}
+
+
+#if 0
+static void nc_dump_registers (struct usbnet *dev)
+{
+ u8 reg;
+ u16 *vp = kmalloc (sizeof (u16));
+
+ if (!vp) {
+ dbg ("no memory?");
+ return;
+ }
+
+ dbg ("%s registers:", dev->net.name);
+ for (reg = 0; reg < 0x20; reg++) {
+ int retval;
+
+ // reading some registers is trouble
+ if (reg >= 0x08 && reg <= 0xf)
+ continue;
+ if (reg >= 0x12 && reg <= 0x1e)
+ continue;
+
+ retval = nc_register_read (dev, reg, vp);
+ if (retval < 0)
+ dbg ("%s reg [0x%x] ==> error %d",
+ dev->net.name, reg, retval);
+ else
+ dbg ("%s reg [0x%x] = 0x%x",
+ dev->net.name, reg, *vp);
+ }
+ kfree (vp);
+}
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Control register
+ */
+
+#define USBCTL_WRITABLE_MASK 0x1f0f
+// bits 15-13 reserved, r/o
+#define USBCTL_ENABLE_LANG (1 << 12)
+#define USBCTL_ENABLE_MFGR (1 << 11)
+#define USBCTL_ENABLE_PROD (1 << 10)
+#define USBCTL_ENABLE_SERIAL (1 << 9)
+#define USBCTL_ENABLE_DEFAULTS (1 << 8)
+// bits 7-4 reserved, r/o
+#define USBCTL_FLUSH_OTHER (1 << 3)
+#define USBCTL_FLUSH_THIS (1 << 2)
+#define USBCTL_DISCONN_OTHER (1 << 1)
+#define USBCTL_DISCONN_THIS (1 << 0)
+
+static inline void nc_dump_usbctl (struct usbnet *dev, u16 usbctl)
+{
+#ifdef DEBUG
+ devdbg (dev, "net1080 %03d/%03d usbctl 0x%x:%s%s%s%s%s;"
+ " this%s%s;"
+ " other%s%s; r/o 0x%x",
+ dev->udev->bus->busnum, dev->udev->devnum,
+ usbctl,
+ (usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
+ (usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
+ (usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
+ (usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
+ (usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
+
+ (usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
+ (usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
+ (usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
+ (usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
+ usbctl & ~USBCTL_WRITABLE_MASK
+ );
+#endif
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Status register
+ */
+
+#define STATUS_PORT_A (1 << 15)
+
+#define STATUS_CONN_OTHER (1 << 14)
+#define STATUS_SUSPEND_OTHER (1 << 13)
+#define STATUS_MAILBOX_OTHER (1 << 12)
+#define STATUS_PACKETS_OTHER(n) (((n) >> 8) && 0x03)
+
+#define STATUS_CONN_THIS (1 << 6)
+#define STATUS_SUSPEND_THIS (1 << 5)
+#define STATUS_MAILBOX_THIS (1 << 4)
+#define STATUS_PACKETS_THIS(n) (((n) >> 0) && 0x03)
+
+#define STATUS_UNSPEC_MASK 0x0c8c
+#define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK))
+
+
+static inline void nc_dump_status (struct usbnet *dev, u16 status)
+{
+#ifdef DEBUG
+ devdbg (dev, "net1080 %03d/%03d status 0x%x:"
+ " this (%c) PKT=%d%s%s%s;"
+ " other PKT=%d%s%s%s; unspec 0x%x",
+ dev->udev->bus->busnum, dev->udev->devnum,
+ status,
+
+ // XXX the packet counts don't seem right
+ // (1 at reset, not 0); maybe UNSPEC too
+
+ (status & STATUS_PORT_A) ? 'A' : 'B',
+ STATUS_PACKETS_THIS (status),
+ (status & STATUS_CONN_THIS) ? " CON" : "",
+ (status & STATUS_SUSPEND_THIS) ? " SUS" : "",
+ (status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
+
+ STATUS_PACKETS_OTHER (status),
+ (status & STATUS_CONN_OTHER) ? " CON" : "",
+ (status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
+ (status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
+
+ status & STATUS_UNSPEC_MASK
+ );
+#endif
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * TTL register
+ */
+
+#define TTL_THIS(ttl) (0x00ff & ttl)
+#define TTL_OTHER(ttl) (0x00ff & (ttl >> 8))
+#define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this))))
+
+static inline void nc_dump_ttl (struct usbnet *dev, u16 ttl)
+{
+#ifdef DEBUG
+ devdbg (dev, "net1080 %03d/%03d ttl 0x%x this = %d, other = %d",
+ dev->udev->bus->busnum, dev->udev->devnum,
+ ttl,
+
+ TTL_THIS (ttl),
+ TTL_OTHER (ttl)
+ );
+#endif
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int net1080_reset (struct usbnet *dev)
+{
+ u16 usbctl, status, ttl;
+ u16 *vp = kmalloc (sizeof (u16), GFP_KERNEL);
+ int retval;
+
+ if (!vp)
+ return -ENOMEM;
+
+ // nc_dump_registers (dev);
+
+ if ((retval = nc_register_read (dev, REG_STATUS, vp)) < 0) {
+ dbg ("can't read dev %d status: %d", dev->udev->devnum, retval);
+ goto done;
+ }
+ status = *vp;
+ // nc_dump_status (dev, status);
+
+ if ((retval = nc_register_read (dev, REG_USBCTL, vp)) < 0) {
+ dbg ("can't read USBCTL, %d", retval);
+ goto done;
+ }
+ usbctl = *vp;
+ // nc_dump_usbctl (dev, usbctl);
+
+ nc_register_write (dev, REG_USBCTL,
+ USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
+
+ if ((retval = nc_register_read (dev, REG_TTL, vp)) < 0) {
+ dbg ("can't read TTL, %d", retval);
+ goto done;
+ }
+ ttl = *vp;
+ // nc_dump_ttl (dev, ttl);
+
+ nc_register_write (dev, REG_TTL,
+ MK_TTL (NC_READ_TTL_MS, TTL_OTHER (ttl)) );
+ dbg ("%s: assigned TTL, %d ms", dev->net.name, NC_READ_TTL_MS);
+
+ devdbg (dev, "port %c, peer %sconnected",
+ (status & STATUS_PORT_A) ? 'A' : 'B',
+ (status & STATUS_CONN_OTHER) ? "" : "dis"
+ );
+ retval = 0;
+
+done:
+ kfree (vp);
+ return retval;
+}
+
+static int net1080_check_connect (struct usbnet *dev)
+{
+ int retval;
+ u16 status;
+ u16 *vp = kmalloc (sizeof (u16), GFP_KERNEL);
+
+ if (!vp)
+ return -ENOMEM;
+ retval = nc_register_read (dev, REG_STATUS, vp);
+ status = *vp;
+ kfree (vp);
+ if (retval != 0) {
+ dbg ("%s net1080_check_conn read - %d", dev->net.name, retval);
+ return retval;
+ }
+ if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER)
+ return -ENOLINK;
+ return 0;
+}
+
+static const struct driver_info net1080_info = {
+ description: "NetChip TurboCONNECT",
+ flags: FLAG_FRAMING,
+ reset: net1080_reset,
+ check_connect: net1080_check_connect,
+
+ in: 1, out: 1, // direction distinguishes these
+ epsize: 64,
+};
+
+#endif /* CONFIG_USB_NET1080 */
+
+
+
+#ifdef CONFIG_USB_PL2301
+
+/*-------------------------------------------------------------------------
+ *
+ * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com
+ *
+ *-------------------------------------------------------------------------*/
+
+/*
+ * Bits 0-4 can be used for software handshaking; they're set from
+ * one end, cleared from the other, "read" with the interrupt byte.
+ */
+#define PL_S_EN (1<<7) /* (feature only) suspend enable */
+/* reserved bit -- rx ready (6) ? */
+#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
+#define PL_RESET_OUT (1<<4) /* reset output pipe */
+#define PL_RESET_IN (1<<3) /* reset input pipe */
+#define PL_TX_C (1<<2) /* transmission complete */
+#define PL_TX_REQ (1<<1) /* transmission received */
+#define PL_PEER_E (1<<0) /* peer exists */
+
+static inline int
+pl_vendor_req (struct usbnet *dev, u8 req, u8 val, u8 index)
+{
+ return usb_control_msg (dev->udev,
+ usb_rcvctrlpipe (dev->udev, 0),
+ req,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ val, index,
+ 0, 0,
+ CONTROL_TIMEOUT_JIFFIES);
+}
+
+static inline int
+pl_clear_QuickLink_features (struct usbnet *dev, int val)
+{
+ return pl_vendor_req (dev, 1, (u8) val, 0);
+}
+
+static inline int
+pl_set_QuickLink_features (struct usbnet *dev, int val)
+{
+ return pl_vendor_req (dev, 3, (u8) val, 0);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int pl_reset (struct usbnet *dev)
+{
+ return pl_set_QuickLink_features (dev,
+ PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
+}
+
+static int pl_check_connect (struct usbnet *dev)
+{
+ // FIXME test interrupt data PL_PEER_E bit
+ // plus, there's some handshake done by
+ // the prolific win32 driver...
+ dbg ("%s: assuming peer is connected", dev->net.name);
+ return 0;
+}
+
+static const struct driver_info prolific_info = {
+ description: "Prolific PL-2301/PL-2302",
+ reset: pl_reset,
+ check_connect: pl_check_connect,
+
+ in: 3, out: 2,
+ epsize: 64,
+};
+
+#endif /* CONFIG_USB_PL2301 */
+
+
+
+/*-------------------------------------------------------------------------
+ *
+ * Network Device Driver (peer link to "Host Device", from USB host)
+ *
+ *-------------------------------------------------------------------------*/
+
+static int usbnet_change_mtu (struct net_device *net, int new_mtu)
+{
+ struct usbnet *dev = (struct usbnet *) net->priv;
+
+ if (new_mtu <= sizeof (struct ethhdr) || new_mtu > MAX_PACKET)
+ return -EINVAL;
+ if (((dev->driver_info->flags) & FLAG_FRAMING)) {
+ if (FRAMED_SIZE (new_mtu) > MAX_PACKET)
+ return -EINVAL;
+ // no second zero-length packet read wanted after mtu-sized packets
+ } else if (((new_mtu + sizeof (struct ethhdr)) % EP_SIZE (dev)) == 0)
+ return -EDOM;
+ net->mtu = new_mtu;
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct net_device_stats *usbnet_get_stats (struct net_device *net)
+{
+ return &((struct usbnet *) net->priv)->stats;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* urb completions are currently in_irq; avoid doing real work then. */
+
+static void defer_bh (struct usbnet *dev, struct sk_buff *skb)
+{
+ struct sk_buff_head *list = skb->list;
+ unsigned long flags;
+
+ spin_lock_irqsave (&list->lock, flags);
+ __skb_unlink (skb, list);
+ spin_unlock (&list->lock);
+ spin_lock (&dev->done.lock);
+ __skb_queue_tail (&dev->done, skb);
+ if (dev->done.qlen == 1)
+ tasklet_schedule (&dev->bh);
+ spin_unlock_irqrestore (&dev->done.lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void rx_complete (struct urb *urb);
+
+static void rx_submit (struct usbnet *dev, struct urb *urb, int flags)
+{
+ struct sk_buff *skb;
+ struct skb_data *entry;
+ int retval = 0;
+ unsigned long lockflags;
+ size_t size;
+
+ size = (dev->driver_info->flags & FLAG_FRAMING)
+ ? FRAMED_SIZE (dev->net.mtu)
+ : (sizeof (struct ethhdr) + dev->net.mtu);
+ if ((skb = alloc_skb (size, flags)) == 0) {
+ dbg ("no rx skb");
+ tasklet_schedule (&dev->bh);
+ usb_free_urb (urb);
+ return;
+ }
+
+ entry = (struct skb_data *) skb->cb;
+ entry->urb = urb;
+ entry->dev = dev;
+ entry->state = rx_start;
+ entry->length = 0;
+
+ FILL_BULK_URB (urb, dev->udev,
+ usb_rcvbulkpipe (dev->udev, dev->driver_info->in),
+ skb->data, size, rx_complete, skb);
+#ifdef REALLY_QUEUE
+ urb->transfer_flags |= USB_QUEUE_BULK;
+#endif
+
+ spin_lock_irqsave (&dev->rxq.lock, lockflags);
+
+ if (netif_running (&dev->net)) {
+ if ((retval = usb_submit_urb (urb)) != 0) {
+ dbg ("%s rx submit, %d", dev->net.name, retval);
+ tasklet_schedule (&dev->bh);
+ } else {
+ __skb_queue_tail (&dev->rxq, skb);
+ }
+ } else {
+ dbg ("rx: stopped");
+ retval = -ENOLINK;
+ }
+ spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
+ if (retval) {
+ dev_kfree_skb_any (skb);
+ usb_free_urb (urb);
+ }
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
+{
+ if (dev->driver_info->flags & FLAG_FRAMING) {
+ struct nc_header *header;
+ struct nc_trailer *trailer;
+
+ if (!(skb->len & 0x01)
+ || MIN_FRAMED > skb->len
+ || skb->len > FRAMED_SIZE (dev->net.mtu)) {
+ dev->stats.rx_frame_errors++;
+ dbg ("rx framesize %d range %d..%d mtu %d", skb->len,
+ MIN_FRAMED, FRAMED_SIZE (dev->net.mtu),
+ dev->net.mtu
+ );
+ goto error;
+ }
+
+ header = (struct nc_header *) skb->data;
+ le16_to_cpus (&header->hdr_len);
+ le16_to_cpus (&header->packet_len);
+ if (FRAMED_SIZE (header->packet_len) > MAX_PACKET) {
+ dev->stats.rx_frame_errors++;
+ dbg ("packet too big, %d", header->packet_len);
+ goto error;
+ } else if (header->hdr_len < MIN_HEADER) {
+ dev->stats.rx_frame_errors++;
+ dbg ("header too short, %d", header->hdr_len);
+ goto error;
+ } else if (header->hdr_len > MIN_HEADER) {
+ // out of band data for us?
+ dbg ("header OOB, %d bytes",
+ header->hdr_len - MIN_HEADER);
+ // switch (vendor/product ids) { ... }
+ }
+ skb_pull (skb, header->hdr_len);
+
+ trailer = (struct nc_trailer *)
+ (skb->data + skb->len - sizeof *trailer);
+ skb_trim (skb, skb->len - sizeof *trailer);
+
+ if ((header->packet_len & 0x01) == 0) {
+ if (skb->data [header->packet_len] != PAD_BYTE) {
+ dev->stats.rx_frame_errors++;
+ dbg ("bad pad");
+ goto error;
+ }
+ skb_trim (skb, skb->len - 1);
+ }
+ if (skb->len != header->packet_len) {
+ dev->stats.rx_frame_errors++;
+ dbg ("bad packet len %d (expected %d)",
+ skb->len, header->packet_len);
+ goto error;
+ }
+ if (header->packet_id != get_unaligned (&trailer->packet_id)) {
+ dev->stats.rx_fifo_errors++;
+ dbg ("(2+ dropped) rx packet_id mismatch 0x%x 0x%x",
+ header->packet_id, trailer->packet_id);
+ goto error;
+ }
+#if 0
+ devdbg (dev, "frame <rx h %d p %d id %d", header->hdr_len,
+ header->packet_len, header->packet_id);
+#endif
+ } else {
+ // we trust the network stack to remove
+ // the extra byte we may have appended
+ }
+
+ if (skb->len) {
+ int status;
+
+// FIXME: eth_copy_and_csum "small" packets to new SKB (small < ~200 bytes) ?
+
+ skb->dev = &dev->net;
+ skb->protocol = eth_type_trans (skb, &dev->net);
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += skb->len;
+
+#ifdef VERBOSE
+ devdbg (dev, "< rx, len %d, type 0x%x",
+ skb->len + sizeof (struct ethhdr), skb->protocol);
+#endif
+ memset (skb->cb,0,sizeof(struct skb_data));
+ status = netif_rx (skb);
+ if (status != NET_RX_SUCCESS)
+ devdbg (dev, "netif_rx status %d", status);
+ } else {
+ dbg ("drop");
+error:
+ dev->stats.rx_errors++;
+ skb_queue_tail (&dev->done, skb);
+ }
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void rx_complete (struct urb *urb)
+{
+ struct sk_buff *skb = (struct sk_buff *) urb->context;
+ struct skb_data *entry = (struct skb_data *) skb->cb;
+ struct usbnet *dev = entry->dev;
+ int urb_status = urb->status;
+
+ skb_put (skb, urb->actual_length);
+ entry->state = rx_done;
+ entry->urb = 0;
+
+ switch (urb_status) {
+ // success
+ case 0:
+ if (MIN_PACKET > skb->len || skb->len > MAX_PACKET) {
+ entry->state = rx_cleanup;
+ dev->stats.rx_errors++;
+ dev->stats.rx_length_errors++;
+ dbg ("rx length %d", skb->len);
+ }
+ break;
+
+ // software-driven interface shutdown
+ case -ECONNRESET: // usb-ohci, usb-uhci
+ case -ECONNABORTED: // uhci ... for usb-uhci, INTR
+ dbg ("%s shutdown, code %d", dev->net.name, urb_status);
+ entry->state = rx_cleanup;
+ // do urb frees only in the tasklet
+ entry->urb = urb;
+ urb = 0;
+ break;
+
+ // data overrun ... flush fifo?
+ case -EOVERFLOW:
+ dev->stats.rx_over_errors++;
+ // FALLTHROUGH
+
+ default:
+ // on unplug we'll get a burst of ETIMEDOUT/EILSEQ
+ // till the khubd gets and handles its interrupt.
+ entry->state = rx_cleanup;
+ dev->stats.rx_errors++;
+ dbg ("%s rx: status %d", dev->net.name, urb_status);
+ break;
+ }
+
+ defer_bh (dev, skb);
+
+ if (urb) {
+ if (netif_running (&dev->net)) {
+ rx_submit (dev, urb, GFP_ATOMIC);
+ return;
+ }
+ }
+#ifdef VERBOSE
+ dbg ("no read resubmitted");
+#endif /* VERBOSE */
+}
+
+/*-------------------------------------------------------------------------*/
+
+// unlink pending rx/tx; completion handlers do all other cleanup
+
+static int unlink_urbs (struct sk_buff_head *q)
+{
+ unsigned long flags;
+ struct sk_buff *skb, *skbnext;
+ int count = 0;
+
+ spin_lock_irqsave (&q->lock, flags);
+ for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) {
+ struct skb_data *entry;
+ struct urb *urb;
+ int retval;
+
+ entry = (struct skb_data *) skb->cb;
+ urb = entry->urb;
+ skbnext = skb->next;
+
+ // during some PM-driven resume scenarios,
+ // these (async) unlinks complete immediately
+ retval = usb_unlink_urb (urb);
+ if (retval < 0)
+ dbg ("unlink urb err, %d", retval);
+ else
+ count++;
+ }
+ spin_unlock_irqrestore (&q->lock, flags);
+ return count;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+// precondition: never called in_interrupt
+
+static int usbnet_stop (struct net_device *net)
+{
+ struct usbnet *dev = (struct usbnet *) net->priv;
+ int temp;
+ DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup);
+ DECLARE_WAITQUEUE (wait, current);
+
+ mutex_lock (&dev->mutex);
+ netif_stop_queue(net);
+
+ devdbg (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
+ dev->stats.rx_packets, dev->stats.tx_packets,
+ dev->stats.rx_errors, dev->stats.tx_errors
+ );
+
+ // ensure there are no more active urbs
+ add_wait_queue (&unlink_wakeup, &wait);
+ dev->wait = &unlink_wakeup;
+ temp = unlink_urbs (&dev->txq) + unlink_urbs (&dev->rxq);
+
+ // maybe wait for deletions to finish.
+ while (skb_queue_len (&dev->rxq)
+ && skb_queue_len (&dev->txq)
+ && skb_queue_len (&dev->done)) {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout (UNLINK_TIMEOUT_JIFFIES);
+ dbg ("waited for %d urb completions", temp);
+ }
+ dev->wait = 0;
+ remove_wait_queue (&unlink_wakeup, &wait);
+
+ mutex_unlock (&dev->mutex);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+// posts reads, and enables write queing
+
+// precondition: never called in_interrupt
+
+static int usbnet_open (struct net_device *net)
+{
+ struct usbnet *dev = (struct usbnet *) net->priv;
+ int retval = 0;
+ struct driver_info *info = dev->driver_info;
+
+ mutex_lock (&dev->mutex);
+
+ // put into "known safe" state
+ if (info->reset && (retval = info->reset (dev)) < 0) {
+ devinfo (dev, "open reset fail (%d) usbnet %03d/%03d, %s",
+ retval,
+ dev->udev->bus->busnum, dev->udev->devnum,
+ info->description);
+ goto done;
+ }
+
+ // insist peer be connected
+ if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
+ devdbg (dev, "can't open; %d", retval);
+ goto done;
+ }
+
+ netif_start_queue (net);
+ devdbg (dev, "open: enable queueing (rx %d, tx %d) mtu %d %sframed",
+ RX_QLEN, TX_QLEN, dev->net.mtu,
+ (info->flags & FLAG_FRAMING) ? "" : "un"
+ );
+
+ // delay posting reads until we're fully open
+ tasklet_schedule (&dev->bh);
+done:
+ mutex_unlock (&dev->mutex);
+ return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* usb_clear_halt cannot be called in interrupt context */
+
+static void
+tx_clear_halt(void *data)
+{
+ struct usbnet *dev = data;
+
+ usb_clear_halt (dev->udev,
+ usb_sndbulkpipe (dev->udev, dev->driver_info->out));
+ netif_wake_queue (&dev->net);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void tx_complete (struct urb *urb)
+{
+ struct sk_buff *skb = (struct sk_buff *) urb->context;
+ struct skb_data *entry = (struct skb_data *) skb->cb;
+ struct usbnet *dev = entry->dev;
+
+ if (urb->status == USB_ST_STALL) {
+ if (dev->ctrl_task.sync == 0) {
+ dev->ctrl_task.routine = tx_clear_halt;
+ dev->ctrl_task.data = dev;
+ schedule_task(&dev->ctrl_task);
+ } else {
+ dbg ("Cannot clear TX stall");
+ }
+ }
+ urb->dev = 0;
+ entry->state = tx_done;
+ defer_bh (dev, skb);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void usbnet_tx_timeout (struct net_device *net)
+{
+ struct usbnet *dev = (struct usbnet *) net->priv;
+
+ unlink_urbs (&dev->txq);
+ tasklet_schedule (&dev->bh);
+
+ // FIXME: device recovery -- reset?
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline struct sk_buff *fixup_skb (struct sk_buff *skb, int flags)
+{
+ int padlen;
+ struct sk_buff *skb2;
+
+ padlen = ((skb->len + sizeof (struct nc_header)
+ + sizeof (struct nc_trailer)) & 0x01) ? 0 : 1;
+ if (!skb_cloned (skb)) {
+ int headroom = skb_headroom (skb);
+ int tailroom = skb_tailroom (skb);
+
+ if ((padlen + sizeof (struct nc_trailer)) <= tailroom
+ && sizeof (struct nc_header) <= headroom)
+ return skb;
+
+ if ((sizeof (struct nc_header) + padlen
+ + sizeof (struct nc_trailer)) <
+ (headroom + tailroom)) {
+ skb->data = memmove (skb->head
+ + sizeof (struct nc_header),
+ skb->data, skb->len);
+ skb->tail = skb->data + skb->len;
+ return skb;
+ }
+ }
+ skb2 = skb_copy_expand (skb,
+ sizeof (struct nc_header),
+ sizeof (struct nc_trailer) + padlen,
+ flags);
+ dev_kfree_skb_any (skb);
+ return skb2;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
+{
+ struct usbnet *dev = (struct usbnet *) net->priv;
+ int length = skb->len;
+ int retval = NET_XMIT_SUCCESS;
+ struct urb *urb = 0;
+ struct skb_data *entry;
+ struct nc_header *header = 0;
+ struct nc_trailer *trailer = 0;
+ struct driver_info *info = dev->driver_info;
+ int flags;
+
+ flags = in_interrupt () ? GFP_ATOMIC : GFP_KERNEL;
+
+ if (info->flags & FLAG_FRAMING) {
+ struct sk_buff *skb2;
+ skb2 = fixup_skb (skb, flags);
+ if (!skb2) {
+ dbg ("can't fixup skb");
+ goto drop;
+ }
+ skb = skb2;
+ }
+
+ if (!(urb = usb_alloc_urb (0))) {
+ dbg ("no urb");
+ goto drop;
+ }
+
+ entry = (struct skb_data *) skb->cb;
+ entry->urb = urb;
+ entry->dev = dev;
+ entry->state = tx_start;
+ entry->length = length;
+
+ if (info->flags & FLAG_FRAMING) {
+ header = (struct nc_header *) skb_push (skb, sizeof *header);
+ header->hdr_len = cpu_to_le16 (sizeof (*header));
+ header->packet_len = cpu_to_le16 (length);
+ if (!((skb->len + sizeof *trailer) & 0x01))
+ *skb_put (skb, 1) = PAD_BYTE;
+ trailer = (struct nc_trailer *) skb_put (skb, sizeof *trailer);
+ } else if ((length % EP_SIZE (dev)) == 0) {
+ if (skb_shared (skb)) {
+ struct sk_buff *skb2;
+ skb2 = skb_unshare (skb, flags);
+ if (!skb2) {
+ dbg ("can't unshare skb");
+ goto drop;
+ }
+ skb = skb2;
+ }
+ skb->len++;
+ }
+
+ FILL_BULK_URB (urb, dev->udev,
+ usb_sndbulkpipe (dev->udev, info->out),
+ skb->data, skb->len, tx_complete, skb);
+ // Idle-but-posted reads with UHCI really chew up
+ // PCI bandwidth unless FSBR is disabled
+ urb->transfer_flags |= USB_ASYNC_UNLINK | USB_NO_FSBR;
+#ifdef REALLY_QUEUE
+ urb->transfer_flags |= USB_QUEUE_BULK;
+#endif
+ // FIXME urb->timeout = ... jiffies ... ;
+
+ spin_lock_irqsave (&dev->txq.lock, flags);
+ if (info->flags & FLAG_FRAMING) {
+ header->packet_id = cpu_to_le16 (dev->packet_id++);
+ put_unaligned (header->packet_id, &trailer->packet_id);
+#if 0
+ devdbg (dev, "frame >tx h %d p %d id %d",
+ header->hdr_len, header->packet_len,
+ header->packet_id);
+#endif
+ }
+
+ netif_stop_queue (net);
+ if ((retval = usb_submit_urb (urb)) != 0) {
+ netif_start_queue (net);
+ dbg ("%s tx: submit urb err %d", net->name, retval);
+ } else {
+ net->trans_start = jiffies;
+ __skb_queue_tail (&dev->txq, skb);
+ if (dev->txq.qlen < TX_QLEN)
+ netif_start_queue (net);
+ }
+ spin_unlock_irqrestore (&dev->txq.lock, flags);
+
+ if (retval) {
+ devdbg (dev, "drop, code %d", retval);
+drop:
+ retval = NET_XMIT_DROP;
+ dev->stats.tx_dropped++;
+ dev_kfree_skb_any (skb);
+ usb_free_urb (urb);
+#ifdef VERBOSE
+ } else {
+ devdbg (dev, "> tx, len %d, type 0x%x",
+ length, skb->protocol);
+#endif
+ }
+ return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+// tasklet ... work that avoided running in_irq()
+
+static void usbnet_bh (unsigned long param)
+{
+ struct usbnet *dev = (struct usbnet *) param;
+ struct sk_buff *skb;
+ struct skb_data *entry;
+
+ while ((skb = skb_dequeue (&dev->done))) {
+ entry = (struct skb_data *) skb->cb;
+ switch (entry->state) {
+ case rx_done:
+ entry->state = rx_cleanup;
+ rx_process (dev, skb);
+ continue;
+ case tx_done:
+ if (entry->urb->status) {
+ // can this statistic become more specific?
+ dev->stats.tx_errors++;
+ dbg ("%s tx: err %d", dev->net.name,
+ entry->urb->status);
+ } else {
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += entry->length;
+ }
+ // FALLTHROUGH:
+ case rx_cleanup:
+ usb_free_urb (entry->urb);
+ dev_kfree_skb (skb);
+ continue;
+ default:
+ dbg ("%s: bogus skb state %d",
+ dev->net.name, entry->state);
+ }
+ }
+
+ // waiting for all pending urbs to complete?
+ if (dev->wait) {
+ if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
+ wake_up (dev->wait);
+ }
+
+ // or are we maybe short a few urbs?
+ } else if (netif_running (&dev->net)) {
+ int temp = dev->rxq.qlen;
+
+ if (temp < RX_QLEN) {
+ struct urb *urb;
+ int i;
+ for (i = 0; i < 3 && dev->rxq.qlen < RX_QLEN; i++) {
+ if ((urb = usb_alloc_urb (0)) != 0)
+ rx_submit (dev, urb, GFP_ATOMIC);
+ }
+ if (temp != dev->rxq.qlen)
+ devdbg (dev, "rxqlen %d --> %d",
+ temp, dev->rxq.qlen);
+ if (dev->rxq.qlen < RX_QLEN)
+ tasklet_schedule (&dev->bh);
+ }
+ if (dev->txq.qlen < TX_QLEN)
+ netif_wake_queue (&dev->net);
+ }
+}
+
+
+
+/*-------------------------------------------------------------------------
+ *
+ * USB Device Driver support
+ *
+ *-------------------------------------------------------------------------*/
+
+// precondition: never called in_interrupt
+
+static void usbnet_disconnect (struct usb_device *udev, void *ptr)
+{
+ struct usbnet *dev = (struct usbnet *) ptr;
+
+ devinfo (dev, "unregister usbnet %03d/%03d, %s",
+ udev->bus->busnum, udev->devnum,
+ dev->driver_info->description);
+
+ unregister_netdev (&dev->net);
+
+ mutex_lock (&usbnet_mutex);
+ mutex_lock (&dev->mutex);
+ list_del (&dev->dev_list);
+ mutex_unlock (&usbnet_mutex);
+
+ kfree (dev);
+ usb_dec_dev_use (udev);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+// precondition: never called in_interrupt
+
+static void *
+usbnet_probe (struct usb_device *udev, unsigned ifnum,
+ const struct usb_device_id *prod)
+{
+ struct usbnet *dev;
+ struct net_device *net;
+ struct usb_interface_descriptor *interface;
+ struct driver_info *info;
+ int altnum = 0;
+
+ info = (struct driver_info *) prod->driver_info;
+
+ // sanity check; expect dedicated interface/devices for now.
+ interface = &udev->actconfig->interface [ifnum].altsetting [altnum];
+ if (udev->descriptor.bNumConfigurations != 1
+ || udev->config[0].bNumInterfaces != 1
+// || interface->bInterfaceClass != USB_CLASS_VENDOR_SPEC
+ ) {
+ dbg ("Bogus config info");
+ return 0;
+ }
+
+ if (usb_set_interface (udev, ifnum, altnum) < 0) {
+ err ("set_interface failed");
+ return 0;
+ }
+
+ // set up our own records
+ if (!(dev = kmalloc (sizeof *dev, GFP_KERNEL))) {
+ dbg ("can't kmalloc dev");
+ return 0;
+ }
+ memset (dev, 0, sizeof *dev);
+
+ init_MUTEX_LOCKED (&dev->mutex);
+ usb_inc_dev_use (udev);
+ dev->udev = udev;
+ dev->driver_info = info;
+ INIT_LIST_HEAD (&dev->dev_list);
+ skb_queue_head_init (&dev->rxq);
+ skb_queue_head_init (&dev->txq);
+ skb_queue_head_init (&dev->done);
+ dev->bh.func = usbnet_bh;
+ dev->bh.data = (unsigned long) dev;
+
+ // set up network interface records
+ net = &dev->net;
+ SET_MODULE_OWNER (net);
+ net->priv = dev;
+ strcpy (net->name, "usb%d");
+ memcpy (net->dev_addr, node_id, sizeof node_id);
+
+ // point-to-point link ... we always use Ethernet headers
+ // supports win32 interop and the bridge driver.
+ ether_setup (net);
+
+ net->change_mtu = usbnet_change_mtu;
+ net->get_stats = usbnet_get_stats;
+ net->hard_start_xmit = usbnet_start_xmit;
+ net->open = usbnet_open;
+ net->stop = usbnet_stop;
+ net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
+ net->tx_timeout = usbnet_tx_timeout;
+
+ register_netdev (&dev->net);
+ devinfo (dev, "register usbnet %03d/%03d, %s",
+ udev->bus->busnum, udev->devnum,
+ dev->driver_info->description);
+
+ // ok, it's ready to go.
+ mutex_lock (&usbnet_mutex);
+ list_add (&dev->dev_list, &usbnet_list);
+ mutex_unlock (&dev->mutex);
+
+ // start as if the link is up
+ netif_device_attach (&dev->net);
+
+ mutex_unlock (&usbnet_mutex);
+ return dev;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * chip vendor names won't normally be on the cables, and
+ * may not be on the device.
+ */
+
+static const struct usb_device_id products [] = {
+
+#ifdef CONFIG_USB_AN2720
+{
+ USB_DEVICE (0x0547, 0x2720), // AnchorChips defaults
+ driver_info: (unsigned long) &an2720_info,
+},
+#endif
+
+
+// GeneSys GL620USB (www.genesyslogic.com.tw)
+// (patch exists against an older driver version)
+
+
+#ifdef CONFIG_USB_LINUXDEV
+/*
+ * for example, this can be a host side talk-to-PDA driver.
+ * this driver is NOT what runs _inside_ a Linux device !!
+ */
+{
+ // 1183 = 0x049F, both used as hex values?
+ USB_DEVICE (0x049F, 0x505A), // Compaq "Itsy"
+ driver_info: (unsigned long) &linuxdev_info,
+},
+#endif
+
+#ifdef CONFIG_USB_NET1080
+{
+ USB_DEVICE (0x0525, 0x1080), // NetChip ref design
+ driver_info: (unsigned long) &net1080_info,
+},
+#endif
+
+#ifdef CONFIG_USB_BELKIN_F5U104
+{
+ USB_DEVICE (0x050d, 0x0004), // Belkin
+ driver_info: (unsigned long) &belkin_info,
+}, {
+ USB_DEVICE (0x056c, 0x8100), // eTEK
+ driver_info: (unsigned long) &belkin_info,
+},
+#endif
+
+#ifdef CONFIG_USB_PL2301
+{
+ USB_DEVICE (0x067b, 0x0000), // PL-2301
+ driver_info: (unsigned long) &prolific_info,
+}, {
+ USB_DEVICE (0x067b, 0x0001), // PL-2302
+ driver_info: (unsigned long) &prolific_info,
+},
+#endif
+
+ { }, // END
+};
+MODULE_DEVICE_TABLE (usb, products);
+
+static struct usb_driver usbnet_driver = {
+ name: "usbnet",
+ id_table: products,
+ probe: usbnet_probe,
+ disconnect: usbnet_disconnect,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init usbnet_init (void)
+{
+ // compiler should optimize this out
+ if (sizeof (((struct sk_buff *)0)->cb) < sizeof (struct skb_data))
+ BUG ();
+
+ get_random_bytes (node_id, sizeof node_id);
+ node_id [0] &= 0xfe; // clear multicast bit
+
+ if (usb_register (&usbnet_driver) < 0)
+ return -1;
+
+ return 0;
+}
+module_init (usbnet_init);
+
+static void __exit usbnet_exit (void)
+{
+ usb_deregister (&usbnet_driver);
+}
+module_exit (usbnet_exit);
+
+MODULE_AUTHOR ("David Brownell <dbrownell@users.sourceforge.net>");
+MODULE_DESCRIPTION ("USB Host-to-Host Link Drivers (Belkin, Linux, NetChip, Prolific, ...)");
+MODULE_LICENSE("GPL");
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)