// SPDX-License-Identifier: GPL-2.0-or-later /* * Net1080 based USB host-to-host cables * Copyright (C) 2000-2005 by David Brownell */ // #define DEBUG // error path messages, extra info // #define VERBOSE // more; success messages #include <linux/module.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/workqueue.h> #include <linux/mii.h> #include <linux/usb.h> #include <linux/usb/usbnet.h> #include <linux/slab.h> #include <linux/unaligned.h> /* * Netchip 1080 driver ... http://www.netchip.com * (Sept 2004: End-of-life announcement has been sent.) * Used in (some) LapLink cables */ #define frame_errors … /* * 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; #define PAD_BYTE … struct nc_trailer { … } __packed; // packets may use FLAG_FRAMING_NC and optional pad #define FRAMED_SIZE(mtu) … #define MIN_FRAMED … /* packets _could_ be up to 64KB... */ #define NC_MAX_PACKET … /* * 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 … /* * We ignore most registers and EEPROM contents. */ #define REG_USBCTL … #define REG_TTL … #define REG_STATUS … /* * Vendor specific requests to read/write data */ #define REQUEST_REGISTER … #define REQUEST_EEPROM … static int nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr) { … } static inline int nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr) { … } static void nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value) { … } static inline void nc_register_write(struct usbnet *dev, u8 regnum, u16 value) { … } #if 0 static void nc_dump_registers(struct usbnet *dev) { u8 reg; u16 *vp = kmalloc(sizeof (u16)); if (!vp) return; netdev_dbg(dev->net, "registers:\n"); 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) netdev_dbg(dev->net, "reg [0x%x] ==> error %d\n", reg, retval); else netdev_dbg(dev->net, "reg [0x%x] = 0x%x\n", reg, *vp); } kfree(vp); } #endif /*-------------------------------------------------------------------------*/ /* * Control register */ #define USBCTL_WRITABLE_MASK … // bits 15-13 reserved, r/o #define USBCTL_ENABLE_LANG … #define USBCTL_ENABLE_MFGR … #define USBCTL_ENABLE_PROD … #define USBCTL_ENABLE_SERIAL … #define USBCTL_ENABLE_DEFAULTS … // bits 7-4 reserved, r/o #define USBCTL_FLUSH_OTHER … #define USBCTL_FLUSH_THIS … #define USBCTL_DISCONN_OTHER … #define USBCTL_DISCONN_THIS … static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl) { … } /*-------------------------------------------------------------------------*/ /* * Status register */ #define STATUS_PORT_A … #define STATUS_CONN_OTHER … #define STATUS_SUSPEND_OTHER … #define STATUS_MAILBOX_OTHER … #define STATUS_PACKETS_OTHER(n) … #define STATUS_CONN_THIS … #define STATUS_SUSPEND_THIS … #define STATUS_MAILBOX_THIS … #define STATUS_PACKETS_THIS(n) … #define STATUS_UNSPEC_MASK … #define STATUS_NOISE_MASK … static inline void nc_dump_status(struct usbnet *dev, u16 status) { … } /*-------------------------------------------------------------------------*/ /* * TTL register */ #define TTL_OTHER(ttl) … #define MK_TTL(this,other) … /*-------------------------------------------------------------------------*/ static int net1080_reset(struct usbnet *dev) { … } static int net1080_check_connect(struct usbnet *dev) { … } static void nc_ensure_sync(struct usbnet *dev) { … } static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb) { … } static struct sk_buff * net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) { … } static int net1080_bind(struct usbnet *dev, struct usb_interface *intf) { … } static const struct driver_info net1080_info = …; static const struct usb_device_id products [] = …; MODULE_DEVICE_TABLE(usb, products); static struct usb_driver net1080_driver = …; module_usb_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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