一个usb网卡驱动程序

/* * QF9700 one chip USB 1.1 ethernet devices * * Author : jokeliujl <jokeliu@163.com> * Date : 2010-10-01 * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ //#define DEBUG #include <linux/module.h> #include <asm/delay.h> #include <linux/sched.h> #include <linux/stddef.h> #include <linux/init.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/mii.h> #include <linux/usb.h> #include <linux/crc32.h> #include <linux/usb/usbnet.h> #include "qf9700.h" /* ------------------------------------------------------------------------------------------ */ /* qf9700 mac and phy operations */ /* qf9700 read some registers from MAC */ static int qf_read(struct usbnet *dev, u8 reg, u16 length, void *data) { void *buf; int err = -ENOMEM; devdbg(dev, "qf_read() reg=0x%02x length=%d", reg, length); buf = kmalloc(length, GFP_KERNEL); if (!buf) goto out; err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), QF_RD_REGS, QF_REQ_RD_REG, 0, reg, buf, length, USB_CTRL_SET_TIMEOUT); if (err == length) memcpy(data, buf, length); else if (err >= 0) err = -EINVAL; kfree(buf); out: return err; } /* qf9700 write some registers to MAC */ static int qf_write(struct usbnet *dev, u8 reg, u16 length, void *data) { void *buf = NULL; int err = -ENOMEM; devdbg(dev, "qf_write() reg=0x%02x, length=%d", reg, length); if (data) { buf = kmalloc(length, GFP_KERNEL); if (!buf) goto out; memcpy(buf, data, length); } err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), QF_WR_REGS, QF_REQ_WR_REG, 0, reg, buf, length, USB_CTRL_SET_TIMEOUT); kfree(buf); if (err >= 0 && err < length) err = -EINVAL; out: return err; } /* qf9700 read one register from MAC */ static int qf_read_reg(struct usbnet *dev, u8 reg, u8 *value) { return qf_read(dev, reg, 1, value); } /* qf9700 write one register to MAC */ static int qf_write_reg(struct usbnet *dev, u8 reg, u8 value) { devdbg(dev, "qf_write_reg() reg=0x%02x, value=0x%02x", reg, value); return usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), QF_WR_REG, QF_REQ_WR_REG, value, reg, NULL, 0, USB_CTRL_SET_TIMEOUT); } /* async mode for writing registers or reg blocks */ static void qf_write_async_callback(struct urb *urb) { struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; if (urb->status < 0) printk(KERN_DEBUG "qf_write_async_callback() failed with %d\n", urb->status); kfree(req); usb_free_urb(urb); } static void qf_write_async_helper(struct usbnet *dev, u8 reg, u8 value, u16 length, void *data) { struct usb_ctrlrequest *req; struct urb *urb; int status; urb = usb_alloc_urb(0, GFP_ATOMIC); if (!urb) { deverr(dev, "Error allocating URB in qf_write_async_helper!"); return; } req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); if (!req) { deverr(dev, "Failed to allocate memory for control request"); usb_free_urb(urb); return; } req->bRequestType = QF_REQ_WR_REG; req->bRequest = length ? QF_WR_REGS : QF_WR_REG; req->wValue = cpu_to_le16(value); req->wIndex = cpu_to_le16(reg); req->wLength = cpu_to_le16(length); usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0), (void *)req, data, length, qf_write_async_callback, req); status = usb_submit_urb(urb, GFP_ATOMIC); if (status < 0) { deverr(dev, "Error submitting the control message: status=%d", status); kfree(req); usb_free_urb(urb); } return; } static void qf_write_async(struct usbnet *dev, u8 reg, u16 length, void *data) { devdbg(dev, "qf_write_async() reg=0x%02x length=%d", reg, length); qf_write_async_helper(dev, reg, 0, length, data); } static void qf_write_reg_async(struct usbnet *dev, u8 reg, u8 value) { devdbg(dev, "qf_write_reg_async() reg=0x%02x value=0x%02x", reg, value); qf_write_async_helper(dev, reg, value, 0, NULL); } /* qf9700 read one word from phy or eeprom */ static int qf_share_read_word(struct usbnet *dev, int phy, u8 reg, __le16 *value) { int ret, i; mutex_lock(&dev->phy_mutex); qf_write_reg(dev, EPAR, phy ? (reg | 0x40) : reg); qf_write_reg(dev, EPCR, phy ? 0xc : 0x4); for (i = 0; i < QF_SHARE_TIMEOUT; i++) { u8 tmp; udelay(1); ret = qf_read_reg(dev, EPCR, &tmp); if (ret < 0) goto out; /* ready */ if ((tmp & 1) == 0) break; } if (i >= QF_SHARE_TIMEOUT) { deverr(dev, "%s read timed out!", phy ? "phy" : "eeprom"); ret = -EIO; goto out; } qf_write_reg(dev, EPCR, 0x0); ret = qf_read(dev, EPDR, 2, value); devdbg(dev, "read shared %d 0x%02x returned 0x%04x, %d", phy, reg, *value, ret); out: mutex_unlock(&dev->phy_mutex); return ret; } /* write one word to phy or eeprom */ static int qf_share_write_word(struct usbnet *dev, int phy, u8 reg, __le16 value) { int ret, i; mutex_lock(&dev->phy_mutex); ret = qf_write(dev, EPDR, 2, &value); if (ret < 0) goto out; qf_write_reg(dev, EPAR, phy ? (reg | 0x40) : reg); qf_write_reg(dev, EPCR, phy ? 0x1a : 0x12); for (i = 0; i < QF_SHARE_TIMEOUT; i++) { u8 tmp; udelay(1); ret = qf_read_reg(dev, EPCR, &tmp); if (ret < 0) goto out; /* ready */ if ((tmp & 1) == 0) break; } if (i >= QF_SHARE_TIMEOUT) { deverr(dev, "%s write timed out!", phy ? "phy" : "eeprom"); ret = -EIO; goto out; } qf_write_reg(dev, EPCR, 0x0); out: mutex_unlock(&dev->phy_mutex); return ret; } static int qf_read_eeprom_word(struct usbnet *dev, u8 offset, void *value) { return qf_share_read_word(dev, 0, offset, value); } static int qf9700_get_eeprom_len(struct net_device *dev) { return QF_EEPROM_LEN; } /* get qf9700 eeprom information */ static int qf9700_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom, u8 * data) { struct usbnet *dev = netdev_priv(net); __le16 *ebuf = (__le16 *) data; int i; /* access is 16bit */ if ((eeprom->offset % 2) || (eeprom->len % 2)) return -EINVAL; for (i = 0; i < eeprom->len / 2; i++) { if (qf_read_eeprom_word(dev, eeprom->offset / 2 + i, &ebuf[i]) < 0) return -EINVAL; } return 0; } /* qf9700 mii-phy register read by word */ static int qf9700_mdio_read(struct net_device *netdev, int phy_id, int loc) { struct usbnet *dev = netdev_priv(netdev); __le16 res; if (phy_id) { devdbg(dev, "Only internal phy supported"); return 0; } qf_share_read_word(dev, 1, loc, &res); devdbg(dev, "qf9700_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x", phy_id, loc, le16_to_cpu(res)); return le16_to_cpu(res); } /* qf9700 mii-phy register write by word */ static void qf9700_mdio_write(struct net_device *netdev, int phy_id, int loc, int val) { struct usbnet *dev = netdev_priv(netdev); __le16 res = cpu_to_le16(val); if (phy_id) { devdbg(dev, "Only internal phy supported"); return; } devdbg(dev,"qf9700_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x", phy_id, loc, val); qf_share_write_word(dev, 1, loc, res); } /*-------------------------------------------------------------------------------------------*/ static void qf9700_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) { /* Inherit standard device info */ usbnet_get_drvinfo(net, info); info->eedump_len = QF_EEPROM_LEN; } static u32 qf9700_get_link(struct net_device *net) { struct usbnet *dev = netdev_priv(net); return mii_link_ok(&dev->mii); } static int qf9700_ioctl(struct net_device *net, struct ifreq *rq, int cmd) { struct usbnet *dev = netdev_priv(net); return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL); } static struct ethtool_ops qf9700_ethtool_ops = { .get_drvinfo = qf9700_get_drvinfo, .get_link = qf9700_get_link, .get_msglevel = usbnet_get_msglevel, .set_msglevel = usbnet_set_msglevel, .get_eeprom_len = qf9700_get_eeprom_len, .get_eeprom = qf9700_