详细介绍：rtl8150 usb 接口网络驱动程序

// SPDX-License-Identifier: GPL-2.0-only
/*

• Copyright © 2002 Petko Manolov (petkan@users.sourceforge.net)
  */

#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/usb.h>
#include <linux/uaccess.h>

/* Version Information */
#define DRIVER_VERSION “v0.6.2 (2004/08/27)”
#define DRIVER_AUTHOR “Petko Manolovpetkan@users.sourceforge.net”
#define DRIVER_DESC “rtl8150 based usb-ethernet driver”

#define IDR 0x0120
#define MAR 0x0126
#define CR 0x012e
#define TCR 0x012f
#define RCR 0x0130
#define TSR 0x0132
#define RSR 0x0133
#define CON0 0x0135
#define CON1 0x0136
#define MSR 0x0137
#define PHYADD 0x0138
#define PHYDAT 0x0139
#define PHYCNT 0x013b
#define GPPC 0x013d
#define BMCR 0x0140
#define BMSR 0x0142
#define ANAR 0x0144
#define ANLP 0x0146
#define AER 0x0148
#define CSCR 0x014C /* This one has the link status */
#define CSCR_LINK_STATUS (1 << 3)

#define IDR_EEPROM 0x1202

#define PHY_READ 0
#define PHY_WRITE 0x20
#define PHY_GO 0x40

#define MII_TIMEOUT 10
#define INTBUFSIZE 8

#define RTL8150_REQT_READ 0xc0
#define RTL8150_REQT_WRITE 0x40
#define RTL8150_REQ_GET_REGS 0x05
#define RTL8150_REQ_SET_REGS 0x05

/* Transmit status register errors/
#define TSR_ECOL (1<<5)
#define TSR_LCOL (1<<4)
#define TSR_LOSS_CRS (1<<3)
#define TSR_JBR (1<<2)
#define TSR_ERRORS (TSR_ECOL | TSR_LCOL | TSR_LOSS_CRS | TSR_JBR)
/Receive status register errors */
#define RSR_CRC (1<<2)
#define RSR_FAE (1<<1)
#define RSR_ERRORS (RSR_CRC | RSR_FAE)

/* Media status register definitions */
#define MSR_DUPLEX (1<<4)
#define MSR_SPEED (1<<3)
#define MSR_LINK (1<<2)

/* Interrupt pipe data */
#define INT_TSR 0x00
#define INT_RSR 0x01
#define INT_MSR 0x02
#define INT_WAKSR 0x03
#define INT_TXOK_CNT 0x04
#define INT_RXLOST_CNT 0x05
#define INT_CRERR_CNT 0x06
#define INT_COL_CNT 0x07

#define RTL8150_MTU 1540
#define RTL8150_TX_TIMEOUT (HZ)
#define RX_SKB_POOL_SIZE 4

/* rtl8150 flags */
#define RTL8150_HW_CRC 0
#define RX_REG_SET 1
#define RTL8150_UNPLUG 2
#define RX_URB_FAIL 3

/* Define these values to match your device */
#define VENDOR_ID_REALTEK 0x0bda
#define VENDOR_ID_MELCO 0x0411
#define VENDOR_ID_MICRONET 0x3980
#define VENDOR_ID_LONGSHINE 0x07b8
#define VENDOR_ID_OQO 0x1557
#define VENDOR_ID_ZYXEL 0x0586

#define PRODUCT_ID_RTL8150 0x8150
#define PRODUCT_ID_LUAKTX 0x0012
#define PRODUCT_ID_LCS8138TX 0x401a
#define PRODUCT_ID_SP128AR 0x0003
#define PRODUCT_ID_PRESTIGE 0x401a

#undef EEPROM_WRITE

/* table of devices that work with this driver */
static const struct usb_device_id rtl8150_table[] = {
{USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8150)},
{USB_DEVICE(VENDOR_ID_MELCO, PRODUCT_ID_LUAKTX)},
{USB_DEVICE(VENDOR_ID_MICRONET, PRODUCT_ID_SP128AR)},
{USB_DEVICE(VENDOR_ID_LONGSHINE, PRODUCT_ID_LCS8138TX)},
{USB_DEVICE(VENDOR_ID_OQO, PRODUCT_ID_RTL8150)},
{USB_DEVICE(VENDOR_ID_ZYXEL, PRODUCT_ID_PRESTIGE)},
{}
};

MODULE_DEVICE_TABLE(usb, rtl8150_table);

struct rtl8150 {
unsigned long flags;
struct usb_device *udev;
struct tasklet_struct tl;
struct net_device *netdev;
struct urb *rx_urb, *tx_urb, *intr_urb;
struct sk_buff *tx_skb, *rx_skb;
struct sk_buff *rx_skb_pool[RX_SKB_POOL_SIZE];
spinlock_t rx_pool_lock;
struct usb_ctrlrequest dr;
int intr_interval;
u8 *intr_buff;
u8 phy;
};

typedef struct rtl8150 rtl8150_t;

struct async_req {
struct usb_ctrlrequest dr;
u16 rx_creg;
};

static const char driver_name [] = “rtl8150”;

/*
**
** device related part of the code
**
*/
static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
{
return usb_control_msg_recv(dev->udev, 0, RTL8150_REQ_GET_REGS,
RTL8150_REQT_READ, indx, 0, data, size,
1000, GFP_NOIO);
}

static int set_registers(rtl8150_t * dev, u16 indx, u16 size, const void *data)
{
return usb_control_msg_send(dev->udev, 0, RTL8150_REQ_SET_REGS,
RTL8150_REQT_WRITE, indx, 0, data, size,
1000, GFP_NOIO);
}

static void async_set_reg_cb(struct urb *urb)
{
struct async_req *req = (struct async_req *)urb->context;
int status = urb->status;

if (status < 0)
	dev_dbg(&urb->dev->dev, "%s failed with %d", __func__, status);
kfree(req);
usb_free_urb(urb);

}

static int async_set_registers(rtl8150_t *dev, u16 indx, u16 size, u16 reg)
{
int res = -ENOMEM;
struct urb