1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2002 Petko Manolov (petkan@users.sourceforge.net) 4 */ 5 6 #include <linux/signal.h> 7 #include <linux/slab.h> 8 #include <linux/module.h> 9 #include <linux/netdevice.h> 10 #include <linux/etherdevice.h> 11 #include <linux/mii.h> 12 #include <linux/ethtool.h> 13 #include <linux/usb.h> 14 #include <linux/uaccess.h> 15 16 #define DRIVER_AUTHOR "Petko Manolov <petkan@users.sourceforge.net>" 17 #define DRIVER_DESC "rtl8150 based usb-ethernet driver" 18 19 #define IDR 0x0120 20 #define MAR 0x0126 21 #define CR 0x012e 22 #define TCR 0x012f 23 #define RCR 0x0130 24 #define TSR 0x0132 25 #define RSR 0x0133 26 #define CON0 0x0135 27 #define CON1 0x0136 28 #define MSR 0x0137 29 #define PHYADD 0x0138 30 #define PHYDAT 0x0139 31 #define PHYCNT 0x013b 32 #define GPPC 0x013d 33 #define BMCR 0x0140 34 #define BMSR 0x0142 35 #define ANAR 0x0144 36 #define ANLP 0x0146 37 #define AER 0x0148 38 #define CSCR 0x014C /* This one has the link status */ 39 #define CSCR_LINK_STATUS (1 << 3) 40 41 #define IDR_EEPROM 0x1202 42 43 #define PHY_READ 0 44 #define PHY_WRITE 0x20 45 #define PHY_GO 0x40 46 47 #define MII_TIMEOUT 10 48 #define INTBUFSIZE 8 49 50 #define RTL8150_REQT_READ 0xc0 51 #define RTL8150_REQT_WRITE 0x40 52 #define RTL8150_REQ_GET_REGS 0x05 53 #define RTL8150_REQ_SET_REGS 0x05 54 55 56 /* Transmit status register errors */ 57 #define TSR_ECOL (1<<5) 58 #define TSR_LCOL (1<<4) 59 #define TSR_LOSS_CRS (1<<3) 60 #define TSR_JBR (1<<2) 61 #define TSR_ERRORS (TSR_ECOL | TSR_LCOL | TSR_LOSS_CRS | TSR_JBR) 62 /* Receive status register errors */ 63 #define RSR_CRC (1<<2) 64 #define RSR_FAE (1<<1) 65 #define RSR_ERRORS (RSR_CRC | RSR_FAE) 66 67 /* Media status register definitions */ 68 #define MSR_DUPLEX (1<<4) 69 #define MSR_SPEED (1<<3) 70 #define MSR_LINK (1<<2) 71 72 /* USB endpoints */ 73 enum rtl8150_usb_ep { 74 RTL8150_USB_EP_CONTROL = 0, 75 RTL8150_USB_EP_BULK_IN = 1, 76 RTL8150_USB_EP_BULK_OUT = 2, 77 RTL8150_USB_EP_INT_IN = 3, 78 }; 79 80 /* Interrupt pipe data */ 81 #define INT_TSR 0x00 82 #define INT_RSR 0x01 83 #define INT_MSR 0x02 84 #define INT_WAKSR 0x03 85 #define INT_TXOK_CNT 0x04 86 #define INT_RXLOST_CNT 0x05 87 #define INT_CRERR_CNT 0x06 88 #define INT_COL_CNT 0x07 89 90 91 #define RTL8150_MTU 1540 92 #define RTL8150_TX_TIMEOUT (HZ) 93 #define RX_SKB_POOL_SIZE 4 94 95 /* rtl8150 flags */ 96 #define RTL8150_HW_CRC 0 97 #define RX_REG_SET 1 98 #define RTL8150_UNPLUG 2 99 #define RX_URB_FAIL 3 100 101 /* Define these values to match your device */ 102 #define VENDOR_ID_REALTEK 0x0bda 103 #define VENDOR_ID_MELCO 0x0411 104 #define VENDOR_ID_MICRONET 0x3980 105 #define VENDOR_ID_LONGSHINE 0x07b8 106 #define VENDOR_ID_OQO 0x1557 107 #define VENDOR_ID_ZYXEL 0x0586 108 109 #define PRODUCT_ID_RTL8150 0x8150 110 #define PRODUCT_ID_LUAKTX 0x0012 111 #define PRODUCT_ID_LCS8138TX 0x401a 112 #define PRODUCT_ID_SP128AR 0x0003 113 #define PRODUCT_ID_PRESTIGE 0x401a 114 115 #undef EEPROM_WRITE 116 117 /* table of devices that work with this driver */ 118 static const struct usb_device_id rtl8150_table[] = { 119 {USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8150)}, 120 {USB_DEVICE(VENDOR_ID_MELCO, PRODUCT_ID_LUAKTX)}, 121 {USB_DEVICE(VENDOR_ID_MICRONET, PRODUCT_ID_SP128AR)}, 122 {USB_DEVICE(VENDOR_ID_LONGSHINE, PRODUCT_ID_LCS8138TX)}, 123 {USB_DEVICE(VENDOR_ID_OQO, PRODUCT_ID_RTL8150)}, 124 {USB_DEVICE(VENDOR_ID_ZYXEL, PRODUCT_ID_PRESTIGE)}, 125 {} 126 }; 127 128 MODULE_DEVICE_TABLE(usb, rtl8150_table); 129 130 struct rtl8150 { 131 unsigned long flags; 132 struct usb_device *udev; 133 struct tasklet_struct tl; 134 struct net_device *netdev; 135 struct urb *rx_urb, *tx_urb, *intr_urb; 136 struct sk_buff *tx_skb, *rx_skb; 137 struct sk_buff *rx_skb_pool[RX_SKB_POOL_SIZE]; 138 spinlock_t rx_pool_lock; 139 struct usb_ctrlrequest dr; 140 int intr_interval; 141 u8 *intr_buff; 142 u8 phy; 143 }; 144 145 typedef struct rtl8150 rtl8150_t; 146 147 struct async_req { 148 struct usb_ctrlrequest dr; 149 u16 rx_creg; 150 }; 151 152 static const char driver_name [] = "rtl8150"; 153 154 /* 155 ** 156 ** device related part of the code 157 ** 158 */ 159 static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data) 160 { 161 return usb_control_msg_recv(dev->udev, 0, RTL8150_REQ_GET_REGS, 162 RTL8150_REQT_READ, indx, 0, data, size, 163 1000, GFP_NOIO); 164 } 165 166 static int set_registers(rtl8150_t * dev, u16 indx, u16 size, const void *data) 167 { 168 return usb_control_msg_send(dev->udev, 0, RTL8150_REQ_SET_REGS, 169 RTL8150_REQT_WRITE, indx, 0, data, size, 170 1000, GFP_NOIO); 171 } 172 173 static void async_set_reg_cb(struct urb *urb) 174 { 175 struct async_req *req = (struct async_req *)urb->context; 176 int status = urb->status; 177 178 if (status < 0) 179 dev_dbg(&urb->dev->dev, "%s failed with %d", __func__, status); 180 kfree(req); 181 usb_free_urb(urb); 182 } 183 184 static int async_set_registers(rtl8150_t *dev, u16 indx, u16 size, u16 reg) 185 { 186 int res = -ENOMEM; 187 struct urb *async_urb; 188 struct async_req *req; 189 190 req = kmalloc_obj(struct async_req, GFP_ATOMIC); 191 if (req == NULL) 192 return res; 193 async_urb = usb_alloc_urb(0, GFP_ATOMIC); 194 if (async_urb == NULL) { 195 kfree(req); 196 return res; 197 } 198 req->rx_creg = cpu_to_le16(reg); 199 req->dr.bRequestType = RTL8150_REQT_WRITE; 200 req->dr.bRequest = RTL8150_REQ_SET_REGS; 201 req->dr.wIndex = 0; 202 req->dr.wValue = cpu_to_le16(indx); 203 req->dr.wLength = cpu_to_le16(size); 204 usb_fill_control_urb(async_urb, dev->udev, 205 usb_sndctrlpipe(dev->udev, 0), (void *)&req->dr, 206 &req->rx_creg, size, async_set_reg_cb, req); 207 res = usb_submit_urb(async_urb, GFP_ATOMIC); 208 if (res) { 209 if (res == -ENODEV) 210 netif_device_detach(dev->netdev); 211 dev_err(&dev->udev->dev, "%s failed with %d\n", __func__, res); 212 kfree(req); 213 usb_free_urb(async_urb); 214 } 215 return res; 216 } 217 218 static int read_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 * reg) 219 { 220 int i; 221 u8 data[3], tmp; 222 223 data[0] = phy; 224 data[1] = data[2] = 0; 225 tmp = indx | PHY_READ | PHY_GO; 226 i = 0; 227 228 set_registers(dev, PHYADD, sizeof(data), data); 229 set_registers(dev, PHYCNT, 1, &tmp); 230 do { 231 get_registers(dev, PHYCNT, 1, data); 232 } while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT)); 233 234 if (i <= MII_TIMEOUT) { 235 get_registers(dev, PHYDAT, 2, data); 236 *reg = data[0] | (data[1] << 8); 237 return 0; 238 } else 239 return 1; 240 } 241 242 static int write_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 reg) 243 { 244 int i; 245 u8 data[3], tmp; 246 247 data[0] = phy; 248 data[1] = reg & 0xff; 249 data[2] = (reg >> 8) & 0xff; 250 tmp = indx | PHY_WRITE | PHY_GO; 251 i = 0; 252 253 set_registers(dev, PHYADD, sizeof(data), data); 254 set_registers(dev, PHYCNT, 1, &tmp); 255 do { 256 get_registers(dev, PHYCNT, 1, data); 257 } while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT)); 258 259 if (i <= MII_TIMEOUT) 260 return 0; 261 else 262 return 1; 263 } 264 265 static void set_ethernet_addr(rtl8150_t *dev) 266 { 267 u8 node_id[ETH_ALEN]; 268 int ret; 269 270 ret = get_registers(dev, IDR, sizeof(node_id), node_id); 271 272 if (!ret) { 273 eth_hw_addr_set(dev->netdev, node_id); 274 } else { 275 eth_hw_addr_random(dev->netdev); 276 netdev_notice(dev->netdev, "Assigned a random MAC address: %pM\n", 277 dev->netdev->dev_addr); 278 } 279 } 280 281 static int rtl8150_set_mac_address(struct net_device *netdev, void *p) 282 { 283 struct sockaddr *addr = p; 284 rtl8150_t *dev = netdev_priv(netdev); 285 286 if (netif_running(netdev)) 287 return -EBUSY; 288 289 eth_hw_addr_set(netdev, addr->sa_data); 290 netdev_dbg(netdev, "Setting MAC address to %pM\n", netdev->dev_addr); 291 /* Set the IDR registers. */ 292 set_registers(dev, IDR, netdev->addr_len, netdev->dev_addr); 293 #ifdef EEPROM_WRITE 294 { 295 int i; 296 u8 cr; 297 /* Get the CR contents. */ 298 get_registers(dev, CR, 1, &cr); 299 /* Set the WEPROM bit (eeprom write enable). */ 300 cr |= 0x20; 301 set_registers(dev, CR, 1, &cr); 302 /* Write the MAC address into eeprom. Eeprom writes must be word-sized, 303 so we need to split them up. */ 304 for (i = 0; i * 2 < netdev->addr_len; i++) { 305 set_registers(dev, IDR_EEPROM + (i * 2), 2, 306 netdev->dev_addr + (i * 2)); 307 } 308 /* Clear the WEPROM bit (preventing accidental eeprom writes). */ 309 cr &= 0xdf; 310 set_registers(dev, CR, 1, &cr); 311 } 312 #endif 313 return 0; 314 } 315 316 static int rtl8150_reset(rtl8150_t * dev) 317 { 318 u8 data = 0x10; 319 int i = HZ; 320 321 set_registers(dev, CR, 1, &data); 322 do { 323 get_registers(dev, CR, 1, &data); 324 } while ((data & 0x10) && --i); 325 326 return (i > 0) ? 1 : 0; 327 } 328 329 static int alloc_all_urbs(rtl8150_t * dev) 330 { 331 dev->rx_urb = usb_alloc_urb(0, GFP_KERNEL); 332 if (!dev->rx_urb) 333 return 0; 334 dev->tx_urb = usb_alloc_urb(0, GFP_KERNEL); 335 if (!dev->tx_urb) { 336 usb_free_urb(dev->rx_urb); 337 return 0; 338 } 339 dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL); 340 if (!dev->intr_urb) { 341 usb_free_urb(dev->rx_urb); 342 usb_free_urb(dev->tx_urb); 343 return 0; 344 } 345 346 return 1; 347 } 348 349 static void free_all_urbs(rtl8150_t * dev) 350 { 351 usb_free_urb(dev->rx_urb); 352 usb_free_urb(dev->tx_urb); 353 usb_free_urb(dev->intr_urb); 354 } 355 356 static void unlink_all_urbs(rtl8150_t * dev) 357 { 358 usb_kill_urb(dev->rx_urb); 359 usb_kill_urb(dev->tx_urb); 360 usb_kill_urb(dev->intr_urb); 361 } 362 363 static inline struct sk_buff *pull_skb(rtl8150_t *dev) 364 { 365 struct sk_buff *skb; 366 int i; 367 368 for (i = 0; i < RX_SKB_POOL_SIZE; i++) { 369 if (dev->rx_skb_pool[i]) { 370 skb = dev->rx_skb_pool[i]; 371 dev->rx_skb_pool[i] = NULL; 372 return skb; 373 } 374 } 375 return NULL; 376 } 377 378 static void read_bulk_callback(struct urb *urb) 379 { 380 rtl8150_t *dev; 381 unsigned pkt_len, res; 382 struct sk_buff *skb; 383 struct net_device *netdev; 384 int status = urb->status; 385 int result; 386 unsigned long flags; 387 388 dev = urb->context; 389 if (!dev) 390 return; 391 if (test_bit(RTL8150_UNPLUG, &dev->flags)) 392 return; 393 netdev = dev->netdev; 394 if (!netif_device_present(netdev)) 395 return; 396 397 switch (status) { 398 case 0: 399 break; 400 case -ENOENT: 401 return; /* the urb is in unlink state */ 402 case -ETIME: 403 if (printk_ratelimit()) 404 dev_warn(&urb->dev->dev, "may be reset is needed?..\n"); 405 goto goon; 406 default: 407 if (printk_ratelimit()) 408 dev_warn(&urb->dev->dev, "Rx status %d\n", status); 409 goto goon; 410 } 411 412 if (!dev->rx_skb) 413 goto resched; 414 /* protect against short packets (tell me why we got some?!?) */ 415 if (urb->actual_length < 4) 416 goto goon; 417 418 res = urb->actual_length; 419 pkt_len = res - 4; 420 421 skb_put(dev->rx_skb, pkt_len); 422 dev->rx_skb->protocol = eth_type_trans(dev->rx_skb, netdev); 423 netif_rx(dev->rx_skb); 424 netdev->stats.rx_packets++; 425 netdev->stats.rx_bytes += pkt_len; 426 427 spin_lock_irqsave(&dev->rx_pool_lock, flags); 428 skb = pull_skb(dev); 429 spin_unlock_irqrestore(&dev->rx_pool_lock, flags); 430 if (!skb) 431 goto resched; 432 433 dev->rx_skb = skb; 434 goon: 435 usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 436 dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev); 437 result = usb_submit_urb(dev->rx_urb, GFP_ATOMIC); 438 if (result == -ENODEV) 439 netif_device_detach(dev->netdev); 440 else if (result) { 441 set_bit(RX_URB_FAIL, &dev->flags); 442 goto resched; 443 } else { 444 clear_bit(RX_URB_FAIL, &dev->flags); 445 } 446 447 return; 448 resched: 449 tasklet_schedule(&dev->tl); 450 } 451 452 static void write_bulk_callback(struct urb *urb) 453 { 454 rtl8150_t *dev; 455 int status = urb->status; 456 457 dev = urb->context; 458 if (!dev) 459 return; 460 dev_kfree_skb_irq(dev->tx_skb); 461 if (!netif_device_present(dev->netdev)) 462 return; 463 if (status) 464 dev_info(&urb->dev->dev, "%s: Tx status %d\n", 465 dev->netdev->name, status); 466 netif_trans_update(dev->netdev); 467 netif_wake_queue(dev->netdev); 468 } 469 470 static void intr_callback(struct urb *urb) 471 { 472 rtl8150_t *dev; 473 __u8 *d; 474 int status = urb->status; 475 int res; 476 477 dev = urb->context; 478 if (!dev) 479 return; 480 switch (status) { 481 case 0: /* success */ 482 break; 483 case -ECONNRESET: /* unlink */ 484 case -ENOENT: 485 case -ESHUTDOWN: 486 return; 487 /* -EPIPE: should clear the halt */ 488 default: 489 dev_info(&urb->dev->dev, "%s: intr status %d\n", 490 dev->netdev->name, status); 491 goto resubmit; 492 } 493 494 d = urb->transfer_buffer; 495 if (d[0] & TSR_ERRORS) { 496 dev->netdev->stats.tx_errors++; 497 if (d[INT_TSR] & (TSR_ECOL | TSR_JBR)) 498 dev->netdev->stats.tx_aborted_errors++; 499 if (d[INT_TSR] & TSR_LCOL) 500 dev->netdev->stats.tx_window_errors++; 501 if (d[INT_TSR] & TSR_LOSS_CRS) 502 dev->netdev->stats.tx_carrier_errors++; 503 } 504 /* Report link status changes to the network stack */ 505 if ((d[INT_MSR] & MSR_LINK) == 0) { 506 if (netif_carrier_ok(dev->netdev)) { 507 netif_carrier_off(dev->netdev); 508 netdev_dbg(dev->netdev, "%s: LINK LOST\n", __func__); 509 } 510 } else { 511 if (!netif_carrier_ok(dev->netdev)) { 512 netif_carrier_on(dev->netdev); 513 netdev_dbg(dev->netdev, "%s: LINK CAME BACK\n", __func__); 514 } 515 } 516 517 resubmit: 518 res = usb_submit_urb (urb, GFP_ATOMIC); 519 if (res == -ENODEV) 520 netif_device_detach(dev->netdev); 521 else if (res) 522 dev_err(&dev->udev->dev, 523 "can't resubmit intr, %s-%s/input0, status %d\n", 524 dev->udev->bus->bus_name, dev->udev->devpath, res); 525 } 526 527 static int rtl8150_suspend(struct usb_interface *intf, pm_message_t message) 528 { 529 rtl8150_t *dev = usb_get_intfdata(intf); 530 531 netif_device_detach(dev->netdev); 532 533 if (netif_running(dev->netdev)) { 534 usb_kill_urb(dev->rx_urb); 535 usb_kill_urb(dev->intr_urb); 536 } 537 return 0; 538 } 539 540 static int rtl8150_resume(struct usb_interface *intf) 541 { 542 rtl8150_t *dev = usb_get_intfdata(intf); 543 544 netif_device_attach(dev->netdev); 545 if (netif_running(dev->netdev)) { 546 dev->rx_urb->status = 0; 547 dev->rx_urb->actual_length = 0; 548 read_bulk_callback(dev->rx_urb); 549 550 dev->intr_urb->status = 0; 551 dev->intr_urb->actual_length = 0; 552 intr_callback(dev->intr_urb); 553 } 554 return 0; 555 } 556 557 /* 558 ** 559 ** network related part of the code 560 ** 561 */ 562 563 static void fill_skb_pool(rtl8150_t *dev) 564 { 565 struct sk_buff *skb; 566 int i; 567 568 for (i = 0; i < RX_SKB_POOL_SIZE; i++) { 569 if (dev->rx_skb_pool[i]) 570 continue; 571 skb = dev_alloc_skb(RTL8150_MTU + 2); 572 if (!skb) { 573 return; 574 } 575 skb_reserve(skb, 2); 576 dev->rx_skb_pool[i] = skb; 577 } 578 } 579 580 static void free_skb_pool(rtl8150_t *dev) 581 { 582 int i; 583 584 for (i = 0; i < RX_SKB_POOL_SIZE; i++) 585 dev_kfree_skb(dev->rx_skb_pool[i]); 586 } 587 588 static void rx_fixup(struct tasklet_struct *t) 589 { 590 struct rtl8150 *dev = from_tasklet(dev, t, tl); 591 struct sk_buff *skb; 592 int status; 593 594 spin_lock_irq(&dev->rx_pool_lock); 595 fill_skb_pool(dev); 596 spin_unlock_irq(&dev->rx_pool_lock); 597 if (test_bit(RX_URB_FAIL, &dev->flags)) 598 if (dev->rx_skb) 599 goto try_again; 600 spin_lock_irq(&dev->rx_pool_lock); 601 skb = pull_skb(dev); 602 spin_unlock_irq(&dev->rx_pool_lock); 603 if (skb == NULL) 604 goto tlsched; 605 dev->rx_skb = skb; 606 usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 607 dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev); 608 try_again: 609 status = usb_submit_urb(dev->rx_urb, GFP_ATOMIC); 610 if (status == -ENODEV) { 611 netif_device_detach(dev->netdev); 612 } else if (status) { 613 set_bit(RX_URB_FAIL, &dev->flags); 614 goto tlsched; 615 } else { 616 clear_bit(RX_URB_FAIL, &dev->flags); 617 } 618 619 return; 620 tlsched: 621 tasklet_schedule(&dev->tl); 622 } 623 624 static int enable_net_traffic(rtl8150_t * dev) 625 { 626 u8 cr, tcr, rcr, msr; 627 628 if (!rtl8150_reset(dev)) { 629 dev_warn(&dev->udev->dev, "device reset failed\n"); 630 } 631 /* RCR bit7=1 attach Rx info at the end; =0 HW CRC (which is broken) */ 632 rcr = 0x9e; 633 tcr = 0xd8; 634 cr = 0x0c; 635 if (!(rcr & 0x80)) 636 set_bit(RTL8150_HW_CRC, &dev->flags); 637 set_registers(dev, RCR, 1, &rcr); 638 set_registers(dev, TCR, 1, &tcr); 639 set_registers(dev, CR, 1, &cr); 640 get_registers(dev, MSR, 1, &msr); 641 642 return 0; 643 } 644 645 static void disable_net_traffic(rtl8150_t * dev) 646 { 647 u8 cr; 648 649 get_registers(dev, CR, 1, &cr); 650 cr &= 0xf3; 651 set_registers(dev, CR, 1, &cr); 652 } 653 654 static void rtl8150_tx_timeout(struct net_device *netdev, unsigned int txqueue) 655 { 656 rtl8150_t *dev = netdev_priv(netdev); 657 dev_warn(&netdev->dev, "Tx timeout.\n"); 658 usb_unlink_urb(dev->tx_urb); 659 netdev->stats.tx_errors++; 660 } 661 662 static void rtl8150_set_multicast(struct net_device *netdev) 663 { 664 rtl8150_t *dev = netdev_priv(netdev); 665 u16 rx_creg = 0x9e; 666 667 if (netdev->flags & IFF_PROMISC) { 668 rx_creg |= 0x0001; 669 dev_info(&netdev->dev, "%s: promiscuous mode\n", netdev->name); 670 } else if (!netdev_mc_empty(netdev) || 671 (netdev->flags & IFF_ALLMULTI)) { 672 rx_creg &= 0xfffe; 673 rx_creg |= 0x0002; 674 dev_dbg(&netdev->dev, "%s: allmulti set\n", netdev->name); 675 } else { 676 /* ~RX_MULTICAST, ~RX_PROMISCUOUS */ 677 rx_creg &= 0x00fc; 678 } 679 async_set_registers(dev, RCR, sizeof(rx_creg), rx_creg); 680 } 681 682 static netdev_tx_t rtl8150_start_xmit(struct sk_buff *skb, 683 struct net_device *netdev) 684 { 685 rtl8150_t *dev = netdev_priv(netdev); 686 unsigned int skb_len; 687 int count, res; 688 689 /* pad the frame and ensure terminating USB packet, datasheet 9.2.3 */ 690 count = max(skb->len, ETH_ZLEN); 691 if (count % 64 == 0) 692 count++; 693 if (skb_padto(skb, count)) { 694 netdev->stats.tx_dropped++; 695 return NETDEV_TX_OK; 696 } 697 698 skb_len = skb->len; 699 700 netif_stop_queue(netdev); 701 dev->tx_skb = skb; 702 usb_fill_bulk_urb(dev->tx_urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), 703 skb->data, count, write_bulk_callback, dev); 704 if ((res = usb_submit_urb(dev->tx_urb, GFP_ATOMIC))) { 705 /* Can we get/handle EPIPE here? */ 706 if (res == -ENODEV) 707 netif_device_detach(dev->netdev); 708 else { 709 dev_warn(&netdev->dev, "failed tx_urb %d\n", res); 710 netdev->stats.tx_errors++; 711 netif_start_queue(netdev); 712 } 713 /* 714 * The URB was not submitted, so write_bulk_callback() will 715 * never run to free dev->tx_skb. Drop the skb here and 716 * clear tx_skb to avoid leaving a stale pointer. 717 */ 718 dev->tx_skb = NULL; 719 dev_kfree_skb_any(skb); 720 } else { 721 netdev->stats.tx_packets++; 722 netdev->stats.tx_bytes += skb_len; 723 netif_trans_update(netdev); 724 } 725 726 return NETDEV_TX_OK; 727 } 728 729 730 static void set_carrier(struct net_device *netdev) 731 { 732 rtl8150_t *dev = netdev_priv(netdev); 733 short tmp; 734 735 get_registers(dev, CSCR, 2, &tmp); 736 if (tmp & CSCR_LINK_STATUS) 737 netif_carrier_on(netdev); 738 else 739 netif_carrier_off(netdev); 740 } 741 742 static int rtl8150_open(struct net_device *netdev) 743 { 744 rtl8150_t *dev = netdev_priv(netdev); 745 int res; 746 747 if (dev->rx_skb == NULL) 748 dev->rx_skb = pull_skb(dev); 749 if (!dev->rx_skb) 750 return -ENOMEM; 751 752 set_registers(dev, IDR, 6, netdev->dev_addr); 753 754 usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 755 dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev); 756 if ((res = usb_submit_urb(dev->rx_urb, GFP_KERNEL))) { 757 if (res == -ENODEV) 758 netif_device_detach(dev->netdev); 759 dev_warn(&netdev->dev, "rx_urb submit failed: %d\n", res); 760 return res; 761 } 762 usb_fill_int_urb(dev->intr_urb, dev->udev, usb_rcvintpipe(dev->udev, 3), 763 dev->intr_buff, INTBUFSIZE, intr_callback, 764 dev, dev->intr_interval); 765 if ((res = usb_submit_urb(dev->intr_urb, GFP_KERNEL))) { 766 if (res == -ENODEV) 767 netif_device_detach(dev->netdev); 768 dev_warn(&netdev->dev, "intr_urb submit failed: %d\n", res); 769 usb_kill_urb(dev->rx_urb); 770 return res; 771 } 772 enable_net_traffic(dev); 773 set_carrier(netdev); 774 netif_start_queue(netdev); 775 776 return res; 777 } 778 779 static int rtl8150_close(struct net_device *netdev) 780 { 781 rtl8150_t *dev = netdev_priv(netdev); 782 783 netif_stop_queue(netdev); 784 if (!test_bit(RTL8150_UNPLUG, &dev->flags)) 785 disable_net_traffic(dev); 786 unlink_all_urbs(dev); 787 788 return 0; 789 } 790 791 static void rtl8150_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *info) 792 { 793 rtl8150_t *dev = netdev_priv(netdev); 794 795 strscpy(info->driver, driver_name, sizeof(info->driver)); 796 usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info)); 797 } 798 799 static int rtl8150_get_link_ksettings(struct net_device *netdev, 800 struct ethtool_link_ksettings *ecmd) 801 { 802 rtl8150_t *dev = netdev_priv(netdev); 803 short lpa = 0; 804 short bmcr = 0; 805 u32 supported; 806 807 supported = (SUPPORTED_10baseT_Half | 808 SUPPORTED_10baseT_Full | 809 SUPPORTED_100baseT_Half | 810 SUPPORTED_100baseT_Full | 811 SUPPORTED_Autoneg | 812 SUPPORTED_TP | SUPPORTED_MII); 813 ecmd->base.port = PORT_TP; 814 ecmd->base.phy_address = dev->phy; 815 get_registers(dev, BMCR, 2, &bmcr); 816 get_registers(dev, ANLP, 2, &lpa); 817 if (bmcr & BMCR_ANENABLE) { 818 u32 speed = ((lpa & (LPA_100HALF | LPA_100FULL)) ? 819 SPEED_100 : SPEED_10); 820 ecmd->base.speed = speed; 821 ecmd->base.autoneg = AUTONEG_ENABLE; 822 if (speed == SPEED_100) 823 ecmd->base.duplex = (lpa & LPA_100FULL) ? 824 DUPLEX_FULL : DUPLEX_HALF; 825 else 826 ecmd->base.duplex = (lpa & LPA_10FULL) ? 827 DUPLEX_FULL : DUPLEX_HALF; 828 } else { 829 ecmd->base.autoneg = AUTONEG_DISABLE; 830 ecmd->base.speed = ((bmcr & BMCR_SPEED100) ? 831 SPEED_100 : SPEED_10); 832 ecmd->base.duplex = (bmcr & BMCR_FULLDPLX) ? 833 DUPLEX_FULL : DUPLEX_HALF; 834 } 835 836 ethtool_convert_legacy_u32_to_link_mode(ecmd->link_modes.supported, 837 supported); 838 839 return 0; 840 } 841 842 static const struct ethtool_ops ops = { 843 .get_drvinfo = rtl8150_get_drvinfo, 844 .get_link = ethtool_op_get_link, 845 .get_link_ksettings = rtl8150_get_link_ksettings, 846 }; 847 848 static int rtl8150_siocdevprivate(struct net_device *netdev, struct ifreq *rq, 849 void __user *udata, int cmd) 850 { 851 rtl8150_t *dev = netdev_priv(netdev); 852 u16 *data = (u16 *) & rq->ifr_ifru; 853 int res = 0; 854 855 switch (cmd) { 856 case SIOCDEVPRIVATE: 857 data[0] = dev->phy; 858 fallthrough; 859 case SIOCDEVPRIVATE + 1: 860 read_mii_word(dev, dev->phy, (data[1] & 0x1f), &data[3]); 861 break; 862 case SIOCDEVPRIVATE + 2: 863 if (!capable(CAP_NET_ADMIN)) 864 return -EPERM; 865 write_mii_word(dev, dev->phy, (data[1] & 0x1f), data[2]); 866 break; 867 default: 868 res = -EOPNOTSUPP; 869 } 870 871 return res; 872 } 873 874 static const struct net_device_ops rtl8150_netdev_ops = { 875 .ndo_open = rtl8150_open, 876 .ndo_stop = rtl8150_close, 877 .ndo_siocdevprivate = rtl8150_siocdevprivate, 878 .ndo_start_xmit = rtl8150_start_xmit, 879 .ndo_tx_timeout = rtl8150_tx_timeout, 880 .ndo_set_rx_mode = rtl8150_set_multicast, 881 .ndo_set_mac_address = rtl8150_set_mac_address, 882 883 .ndo_validate_addr = eth_validate_addr, 884 }; 885 886 static int rtl8150_probe(struct usb_interface *intf, 887 const struct usb_device_id *id) 888 { 889 struct usb_device *udev = interface_to_usbdev(intf); 890 rtl8150_t *dev; 891 struct net_device *netdev; 892 static const u8 bulk_ep_addr[] = { 893 RTL8150_USB_EP_BULK_IN | USB_DIR_IN, 894 RTL8150_USB_EP_BULK_OUT | USB_DIR_OUT, 895 0}; 896 static const u8 int_ep_addr[] = { 897 RTL8150_USB_EP_INT_IN | USB_DIR_IN, 898 0}; 899 900 netdev = alloc_etherdev(sizeof(rtl8150_t)); 901 if (!netdev) 902 return -ENOMEM; 903 904 dev = netdev_priv(netdev); 905 906 dev->intr_buff = kmalloc(INTBUFSIZE, GFP_KERNEL); 907 if (!dev->intr_buff) { 908 free_netdev(netdev); 909 return -ENOMEM; 910 } 911 912 /* Verify that all required endpoints are present */ 913 if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) || 914 !usb_check_int_endpoints(intf, int_ep_addr)) { 915 dev_err(&intf->dev, "couldn't find required endpoints\n"); 916 goto out; 917 } 918 919 tasklet_setup(&dev->tl, rx_fixup); 920 spin_lock_init(&dev->rx_pool_lock); 921 922 dev->udev = udev; 923 dev->netdev = netdev; 924 netdev->netdev_ops = &rtl8150_netdev_ops; 925 netdev->watchdog_timeo = RTL8150_TX_TIMEOUT; 926 netdev->ethtool_ops = &ops; 927 dev->intr_interval = 100; /* 100ms */ 928 929 if (!alloc_all_urbs(dev)) { 930 dev_err(&intf->dev, "out of memory\n"); 931 goto out; 932 } 933 if (!rtl8150_reset(dev)) { 934 dev_err(&intf->dev, "couldn't reset the device\n"); 935 goto out1; 936 } 937 fill_skb_pool(dev); 938 set_ethernet_addr(dev); 939 940 usb_set_intfdata(intf, dev); 941 SET_NETDEV_DEV(netdev, &intf->dev); 942 if (register_netdev(netdev) != 0) { 943 dev_err(&intf->dev, "couldn't register the device\n"); 944 goto out2; 945 } 946 947 dev_info(&intf->dev, "%s: rtl8150 is detected\n", netdev->name); 948 949 return 0; 950 951 out2: 952 usb_set_intfdata(intf, NULL); 953 free_skb_pool(dev); 954 out1: 955 free_all_urbs(dev); 956 out: 957 kfree(dev->intr_buff); 958 free_netdev(netdev); 959 return -EIO; 960 } 961 962 static void rtl8150_disconnect(struct usb_interface *intf) 963 { 964 rtl8150_t *dev = usb_get_intfdata(intf); 965 966 usb_set_intfdata(intf, NULL); 967 if (dev) { 968 set_bit(RTL8150_UNPLUG, &dev->flags); 969 tasklet_kill(&dev->tl); 970 unregister_netdev(dev->netdev); 971 unlink_all_urbs(dev); 972 free_all_urbs(dev); 973 free_skb_pool(dev); 974 dev_kfree_skb(dev->rx_skb); 975 kfree(dev->intr_buff); 976 free_netdev(dev->netdev); 977 } 978 } 979 980 static struct usb_driver rtl8150_driver = { 981 .name = driver_name, 982 .probe = rtl8150_probe, 983 .disconnect = rtl8150_disconnect, 984 .id_table = rtl8150_table, 985 .suspend = rtl8150_suspend, 986 .resume = rtl8150_resume, 987 .disable_hub_initiated_lpm = 1, 988 }; 989 990 module_usb_driver(rtl8150_driver); 991 992 MODULE_AUTHOR(DRIVER_AUTHOR); 993 MODULE_DESCRIPTION(DRIVER_DESC); 994 MODULE_LICENSE("GPL"); 995