drivers/net/usb/kaweth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /****************************************************************
   3  *
   4  *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
   5  *
   6  *     (c) 2000 Interlan Communications
   7  *     (c) 2000 Stephane Alnet
   8  *     (C) 2001 Brad Hards
   9  *     (C) 2002 Oliver Neukum
  10  *
  11  *     Original author: The Zapman <zapman@interlan.net>
  12  *     Inspired by, and much credit goes to Michael Rothwell
  13  *     <rothwell@interlan.net> for the test equipment, help, and patience
  14  *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
  15  *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
  16  *     for providing the firmware and driver resources.
  17  *
  18  ****************************************************************/
  19
  20 /* TODO:
  21  * Develop test procedures for USB net interfaces
  22  * Run test procedures
  23  * Fix bugs from previous two steps
  24  * Snoop other OSs for any tricks we're not doing
  25  * Reduce arbitrary timeouts
  26  * Smart multicast support
  27  * Temporary MAC change support
  28  * Tunable SOFs parameter - ioctl()?
  29  * Ethernet stats collection
  30  * Code formatting improvements
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/string.h>
  36 #include <linux/delay.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/etherdevice.h>
  39 #include <linux/usb.h>
  40 #include <linux/types.h>
  41 #include <linux/ethtool.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/wait.h>
  44 #include <linux/firmware.h>
  45 #include <linux/uaccess.h>
  46 #include <asm/byteorder.h>
  47
  48 #undef DEBUG
  49
  50 #define KAWETH_MTU                      1514
  51 #define KAWETH_BUF_SIZE                 1664
  52 #define KAWETH_TX_TIMEOUT               (5 * HZ)
  53 #define KAWETH_SCRATCH_SIZE             32
  54 #define KAWETH_FIRMWARE_BUF_SIZE        4096
  55 #define KAWETH_CONTROL_TIMEOUT          (30000)
  56
  57 #define KAWETH_STATUS_BROKEN            0x0000001
  58 #define KAWETH_STATUS_CLOSING           0x0000002
  59 #define KAWETH_STATUS_SUSPENDING        0x0000004
  60
  61 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  62
  63 #define KAWETH_PACKET_FILTER_PROMISCUOUS        0x01
  64 #define KAWETH_PACKET_FILTER_ALL_MULTICAST      0x02
  65 #define KAWETH_PACKET_FILTER_DIRECTED           0x04
  66 #define KAWETH_PACKET_FILTER_BROADCAST          0x08
  67 #define KAWETH_PACKET_FILTER_MULTICAST          0x10
  68
  69 /* Table 7 */
  70 #define KAWETH_COMMAND_GET_ETHERNET_DESC        0x00
  71 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  72 #define KAWETH_COMMAND_SET_PACKET_FILTER        0x02
  73 #define KAWETH_COMMAND_STATISTICS               0x03
  74 #define KAWETH_COMMAND_SET_TEMP_MAC             0x06
  75 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  76 #define KAWETH_COMMAND_SET_URB_SIZE             0x08
  77 #define KAWETH_COMMAND_SET_SOFS_WAIT            0x09
  78 #define KAWETH_COMMAND_SCAN                     0xFF
  79
  80 #define KAWETH_SOFS_TO_WAIT                     0x05
  81
  82 #define INTBUFFERSIZE                           4
  83
  84 #define STATE_OFFSET                            0
  85 #define STATE_MASK                              0x40
  86 #define STATE_SHIFT                             5
  87
  88 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
  89
  90
  91 MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
  92 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
  93 MODULE_LICENSE("GPL");
  94 MODULE_FIRMWARE("kaweth/new_code.bin");
  95 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
  96 MODULE_FIRMWARE("kaweth/trigger_code.bin");
  97 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
  98
  99 static const char driver_name[] = "kaweth";
 100
 101 static int kaweth_probe(
 102                 struct usb_interface *intf,
 103                 const struct usb_device_id *id  /* from id_table */
 104         );
 105 static void kaweth_disconnect(struct usb_interface *intf);
 106 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 107 static int kaweth_resume(struct usb_interface *intf);
 108
 109 /****************************************************************
 110  *     usb_device_id
 111  ****************************************************************/
 112 static const struct usb_device_id usb_klsi_table[] = {
 113         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 114         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 115         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 116         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 117         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 118         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 119         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 120         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 121         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 122         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 123         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 124         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 125         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 126         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 127         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 128         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 129         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 130         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 131         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 132         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 133         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 134         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 135         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 136         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 137         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 138         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 139         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 140         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 141         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 142         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 143         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 144         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 145         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 146         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 147         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 148         {} /* Null terminator */
 149 };
 150
 151 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 152
 153 /****************************************************************
 154  *     kaweth_driver
 155  ****************************************************************/
 156 static struct usb_driver kaweth_driver = {
 157         .name =         driver_name,
 158         .probe =        kaweth_probe,
 159         .disconnect =   kaweth_disconnect,
 160         .suspend =      kaweth_suspend,
 161         .resume =       kaweth_resume,
 162         .id_table =     usb_klsi_table,
 163         .supports_autosuspend = 1,
 164         .disable_hub_initiated_lpm = 1,
 165 };
 166
 167 typedef __u8 eth_addr_t[6];
 168
 169 /****************************************************************
 170  *     usb_eth_dev
 171  ****************************************************************/
 172 struct usb_eth_dev {
 173         char *name;
 174         __u16 vendor;
 175         __u16 device;
 176         void *pdata;
 177 };
 178
 179 /****************************************************************
 180  *     kaweth_ethernet_configuration
 181  *     Refer Table 8
 182  ****************************************************************/
 183 struct kaweth_ethernet_configuration
 184 {
 185         __u8 size;
 186         __u8 reserved1;
 187         __u8 reserved2;
 188         eth_addr_t hw_addr;
 189         __u32 statistics_mask;
 190         __le16 segment_size;
 191         __u16 max_multicast_filters;
 192         __u8 reserved3;
 193 } __packed;
 194
 195 /****************************************************************
 196  *     kaweth_device
 197  ****************************************************************/
 198 struct kaweth_device
 199 {
 200         spinlock_t device_lock;
 201
 202         __u32 status;
 203         int end;
 204         int suspend_lowmem_rx;
 205         int suspend_lowmem_ctrl;
 206         int linkstate;
 207         int opened;
 208         struct delayed_work lowmem_work;
 209
 210         struct usb_device *dev;
 211         struct usb_interface *intf;
 212         struct net_device *net;
 213         wait_queue_head_t term_wait;
 214
 215         struct urb *rx_urb;
 216         struct urb *tx_urb;
 217         struct urb *irq_urb;
 218
 219         dma_addr_t intbufferhandle;
 220         __u8 *intbuffer;
 221         dma_addr_t rxbufferhandle;
 222         __u8 *rx_buf;
 223
 224
 225         struct sk_buff *tx_skb;
 226
 227         __u8 *firmware_buf;
 228         __u8 scratch[KAWETH_SCRATCH_SIZE];
 229         __u16 packet_filter_bitmap;
 230
 231         struct kaweth_ethernet_configuration configuration;
 232 };
 233
 234 /****************************************************************
 235  *     kaweth_read_configuration
 236  ****************************************************************/
 237 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 238 {
 239         return usb_control_msg(kaweth->dev, usb_rcvctrlpipe(kaweth->dev, 0),
 240                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 241                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 242                                 0, 0,
 243                                 &kaweth->configuration,
 244                                 sizeof(kaweth->configuration),
 245                                 KAWETH_CONTROL_TIMEOUT);
 246 }
 247
 248 /****************************************************************
 249  *     kaweth_set_urb_size
 250  ****************************************************************/
 251 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 252 {
 253         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 254
 255         return usb_control_msg(kaweth->dev, usb_sndctrlpipe(kaweth->dev, 0),
 256                                KAWETH_COMMAND_SET_URB_SIZE,
 257                                USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 258                                urb_size, 0,
 259                                &kaweth->scratch, 0,
 260                                KAWETH_CONTROL_TIMEOUT);
 261 }
 262
 263 /****************************************************************
 264  *     kaweth_set_sofs_wait
 265  ****************************************************************/
 266 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 267 {
 268         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 269
 270         return usb_control_msg(kaweth->dev, usb_sndctrlpipe(kaweth->dev, 0),
 271                                KAWETH_COMMAND_SET_SOFS_WAIT,
 272                                USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 273                                sofs_wait, 0,
 274                                &kaweth->scratch, 0,
 275                                KAWETH_CONTROL_TIMEOUT);
 276 }
 277
 278 /****************************************************************
 279  *     kaweth_set_receive_filter
 280  ****************************************************************/
 281 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 282                                      __u16 receive_filter)
 283 {
 284         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 285                    (unsigned)receive_filter);
 286
 287         return usb_control_msg(kaweth->dev, usb_sndctrlpipe(kaweth->dev, 0),
 288                                KAWETH_COMMAND_SET_PACKET_FILTER,
 289                                USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 290                                receive_filter, 0,
 291                                &kaweth->scratch, 0,
 292                                KAWETH_CONTROL_TIMEOUT);
 293 }
 294
 295 /****************************************************************
 296  *     kaweth_download_firmware
 297  ****************************************************************/
 298 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 299                                     const char *fwname,
 300                                     __u8 interrupt,
 301                                     __u8 type)
 302 {
 303         const struct firmware *fw;
 304         int data_len;
 305         int ret;
 306
 307         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
 308         if (ret) {
 309                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 310                 return ret;
 311         }
 312
 313         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 314                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 315                         fw->size);
 316                 release_firmware(fw);
 317                 return -ENOSPC;
 318         }
 319         data_len = fw->size;
 320         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 321
 322         release_firmware(fw);
 323
 324         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 325         kaweth->firmware_buf[3] = data_len >> 8;
 326         kaweth->firmware_buf[4] = type;
 327         kaweth->firmware_buf[5] = interrupt;
 328
 329         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 330                    kaweth->firmware_buf[2]);
 331
 332         netdev_dbg(kaweth->net,
 333                    "Downloading firmware at %p to kaweth device at %p\n",
 334                    kaweth->firmware_buf, kaweth);
 335         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
 336
 337         return usb_control_msg(kaweth->dev, usb_sndctrlpipe(kaweth->dev, 0),
 338                               KAWETH_COMMAND_SCAN,
 339                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 340                               0, 0,
 341                               kaweth->firmware_buf, data_len,
 342                               KAWETH_CONTROL_TIMEOUT);
 343 }
 344
 345 /****************************************************************
 346  *     kaweth_trigger_firmware
 347  ****************************************************************/
 348 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 349                                    __u8 interrupt)
 350 {
 351         kaweth->firmware_buf[0] = 0xB6;
 352         kaweth->firmware_buf[1] = 0xC3;
 353         kaweth->firmware_buf[2] = 0x01;
 354         kaweth->firmware_buf[3] = 0x00;
 355         kaweth->firmware_buf[4] = 0x06;
 356         kaweth->firmware_buf[5] = interrupt;
 357         kaweth->firmware_buf[6] = 0x00;
 358         kaweth->firmware_buf[7] = 0x00;
 359
 360         return usb_control_msg(kaweth->dev, usb_sndctrlpipe(kaweth->dev, 0),
 361                                KAWETH_COMMAND_SCAN,
 362                                USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 363                                0, 0,
 364                                (void *)kaweth->firmware_buf, 8,
 365                                KAWETH_CONTROL_TIMEOUT);
 366 }
 367
 368 /****************************************************************
 369  *     kaweth_reset
 370  ****************************************************************/
 371 static int kaweth_reset(struct kaweth_device *kaweth)
 372 {
 373         int result;
 374
 375         result = usb_reset_configuration(kaweth->dev);
 376         mdelay(10);
 377
 378         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
 379
 380         return result;
 381 }
 382
 383 static void kaweth_usb_receive(struct urb *);
 384 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 385
 386 /****************************************************************
 387         int_callback
 388 *****************************************************************/
 389
 390 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 391 {
 392         int status;
 393
 394         status = usb_submit_urb (kaweth->irq_urb, mf);
 395         if (unlikely(status == -ENOMEM)) {
 396                 kaweth->suspend_lowmem_ctrl = 1;
 397                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 398         } else {
 399                 kaweth->suspend_lowmem_ctrl = 0;
 400         }
 401
 402         if (status)
 403                 dev_err(&kaweth->intf->dev,
 404                         "can't resubmit intr, %s-%s, status %d\n",
 405                         kaweth->dev->bus->bus_name,
 406                         kaweth->dev->devpath, status);
 407 }
 408
 409 static void int_callback(struct urb *u)
 410 {
 411         struct kaweth_device *kaweth = u->context;
 412         int act_state;
 413         int status = u->status;
 414
 415         switch (status) {
 416         case 0:                 /* success */
 417                 break;
 418         case -ECONNRESET:       /* unlink */
 419         case -ENOENT:
 420         case -ESHUTDOWN:
 421                 return;
 422         /* -EPIPE:  should clear the halt */
 423         default:                /* error */
 424                 goto resubmit;
 425         }
 426
 427         /* we check the link state to report changes */
 428         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 429                 if (act_state)
 430                         netif_carrier_on(kaweth->net);
 431                 else
 432                         netif_carrier_off(kaweth->net);
 433
 434                 kaweth->linkstate = act_state;
 435         }
 436 resubmit:
 437         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 438 }
 439
 440 static void kaweth_resubmit_tl(struct work_struct *work)
 441 {
 442         struct kaweth_device *kaweth =
 443                 container_of(work, struct kaweth_device, lowmem_work.work);
 444
 445         if (IS_BLOCKED(kaweth->status))
 446                 return;
 447
 448         if (kaweth->suspend_lowmem_rx)
 449                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 450
 451         if (kaweth->suspend_lowmem_ctrl)
 452                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 453 }
 454
 455
 456 /****************************************************************
 457  *     kaweth_resubmit_rx_urb
 458  ****************************************************************/
 459 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 460                                                 gfp_t mem_flags)
 461 {
 462         int result;
 463
 464         usb_fill_bulk_urb(kaweth->rx_urb,
 465                       kaweth->dev,
 466                       usb_rcvbulkpipe(kaweth->dev, 1),
 467                       kaweth->rx_buf,
 468                       KAWETH_BUF_SIZE,
 469                       kaweth_usb_receive,
 470                       kaweth);
 471         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 472         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 473
 474         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 475                 if (result == -ENOMEM) {
 476                         kaweth->suspend_lowmem_rx = 1;
 477                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 478                 }
 479                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
 480                         result);
 481         } else {
 482                 kaweth->suspend_lowmem_rx = 0;
 483         }
 484
 485         return result;
 486 }
 487
 488 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth,
 489                                      bool may_sleep);
 490
 491 /****************************************************************
 492  *     kaweth_usb_receive
 493  ****************************************************************/
 494 static void kaweth_usb_receive(struct urb *urb)
 495 {
 496         struct device *dev = &urb->dev->dev;
 497         struct kaweth_device *kaweth = urb->context;
 498         struct net_device *net = kaweth->net;
 499         int status = urb->status;
 500         unsigned long flags;
 501         int count = urb->actual_length;
 502         int count2 = urb->transfer_buffer_length;
 503
 504         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 505
 506         struct sk_buff *skb;
 507
 508         if (unlikely(status == -EPIPE)) {
 509                 net->stats.rx_errors++;
 510                 kaweth->end = 1;
 511                 wake_up(&kaweth->term_wait);
 512                 dev_dbg(dev, "Status was -EPIPE.\n");
 513                 return;
 514         }
 515         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 516                 /* we are killed - set a flag and wake the disconnect handler */
 517                 kaweth->end = 1;
 518                 wake_up(&kaweth->term_wait);
 519                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 520                 return;
 521         }
 522         if (unlikely(status == -EPROTO || status == -ETIME ||
 523                      status == -EILSEQ)) {
 524                 net->stats.rx_errors++;
 525                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 526                 return;
 527         }
 528         if (unlikely(status == -EOVERFLOW)) {
 529                 net->stats.rx_errors++;
 530                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
 531         }
 532         spin_lock_irqsave(&kaweth->device_lock, flags);
 533         if (IS_BLOCKED(kaweth->status)) {
 534                 spin_unlock_irqrestore(&kaweth->device_lock, flags);
 535                 return;
 536         }
 537         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 538
 539         if(status && status != -EREMOTEIO && count != 1) {
 540                 dev_err(&kaweth->intf->dev,
 541                         "%s RX status: %d count: %d packet_len: %d\n",
 542                         net->name, status, count, (int)pkt_len);
 543                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 544                 return;
 545         }
 546
 547         if(kaweth->net && (count > 2)) {
 548                 if(pkt_len > (count - 2)) {
 549                         dev_err(&kaweth->intf->dev,
 550                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 551                                 pkt_len, count);
 552                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 553                                 pkt_len & 2047);
 554                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 555                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 556                         return;
 557                 }
 558
 559                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 560                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 561                         return;
 562                 }
 563
 564                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 565
 566                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 567
 568                 skb_put(skb, pkt_len);
 569
 570                 skb->protocol = eth_type_trans(skb, net);
 571
 572                 netif_rx(skb);
 573
 574                 net->stats.rx_packets++;
 575                 net->stats.rx_bytes += pkt_len;
 576         }
 577
 578         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 579 }
 580
 581 /****************************************************************
 582  *     kaweth_open
 583  ****************************************************************/
 584 static int kaweth_open(struct net_device *net)
 585 {
 586         struct kaweth_device *kaweth = netdev_priv(net);
 587         int res;
 588
 589         res = usb_autopm_get_interface(kaweth->intf);
 590         if (res) {
 591                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 592                 return -EIO;
 593         }
 594         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 595         if (res)
 596                 goto err_out;
 597
 598         usb_fill_int_urb(
 599                 kaweth->irq_urb,
 600                 kaweth->dev,
 601                 usb_rcvintpipe(kaweth->dev, 3),
 602                 kaweth->intbuffer,
 603                 INTBUFFERSIZE,
 604                 int_callback,
 605                 kaweth,
 606                 250); /* overriding the descriptor */
 607         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 608         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 609
 610         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 611         if (res) {
 612                 usb_kill_urb(kaweth->rx_urb);
 613                 goto err_out;
 614         }
 615         kaweth->opened = 1;
 616
 617         netif_start_queue(net);
 618
 619         kaweth_async_set_rx_mode(kaweth, true);
 620         return 0;
 621
 622 err_out:
 623         usb_autopm_put_interface(kaweth->intf);
 624         return -EIO;
 625 }
 626
 627 /****************************************************************
 628  *     kaweth_kill_urbs
 629  ****************************************************************/
 630 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 631 {
 632         usb_kill_urb(kaweth->irq_urb);
 633         usb_kill_urb(kaweth->rx_urb);
 634         usb_kill_urb(kaweth->tx_urb);
 635
 636         cancel_delayed_work_sync(&kaweth->lowmem_work);
 637
 638         /* a scheduled work may have resubmitted,
 639            we hit them again */
 640         usb_kill_urb(kaweth->irq_urb);
 641         usb_kill_urb(kaweth->rx_urb);
 642 }
 643
 644 /****************************************************************
 645  *     kaweth_close
 646  ****************************************************************/
 647 static int kaweth_close(struct net_device *net)
 648 {
 649         struct kaweth_device *kaweth = netdev_priv(net);
 650
 651         netif_stop_queue(net);
 652         kaweth->opened = 0;
 653
 654         kaweth->status |= KAWETH_STATUS_CLOSING;
 655
 656         kaweth_kill_urbs(kaweth);
 657
 658         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 659
 660         usb_autopm_put_interface(kaweth->intf);
 661
 662         return 0;
 663 }
 664
 665 static u32 kaweth_get_link(struct net_device *dev)
 666 {
 667         struct kaweth_device *kaweth = netdev_priv(dev);
 668
 669         return kaweth->linkstate;
 670 }
 671
 672 static const struct ethtool_ops ops = {
 673         .get_link       = kaweth_get_link
 674 };
 675
 676 /****************************************************************
 677  *     kaweth_usb_transmit_complete
 678  ****************************************************************/
 679 static void kaweth_usb_transmit_complete(struct urb *urb)
 680 {
 681         struct kaweth_device *kaweth = urb->context;
 682         struct sk_buff *skb = kaweth->tx_skb;
 683         int status = urb->status;
 684
 685         if (unlikely(status != 0))
 686                 if (status != -ENOENT)
 687                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 688                                 kaweth->net->name, status);
 689
 690         netif_wake_queue(kaweth->net);
 691         dev_kfree_skb_irq(skb);
 692 }
 693
 694 /****************************************************************
 695  *     kaweth_start_xmit
 696  ****************************************************************/
 697 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 698                                            struct net_device *net)
 699 {
 700         struct kaweth_device *kaweth = netdev_priv(net);
 701         __le16 *private_header;
 702
 703         int res;
 704
 705         spin_lock_irq(&kaweth->device_lock);
 706
 707         kaweth_async_set_rx_mode(kaweth, false);
 708         netif_stop_queue(net);
 709         if (IS_BLOCKED(kaweth->status)) {
 710                 goto skip;
 711         }
 712
 713         /* We now decide whether we can put our special header into the sk_buff */
 714         if (skb_cow_head(skb, 2)) {
 715                 net->stats.tx_errors++;
 716                 netif_start_queue(net);
 717                 spin_unlock_irq(&kaweth->device_lock);
 718                 dev_kfree_skb_any(skb);
 719                 return NETDEV_TX_OK;
 720         }
 721
 722         private_header = __skb_push(skb, 2);
 723         *private_header = cpu_to_le16(skb->len-2);
 724         kaweth->tx_skb = skb;
 725
 726         usb_fill_bulk_urb(kaweth->tx_urb,
 727                       kaweth->dev,
 728                       usb_sndbulkpipe(kaweth->dev, 2),
 729                       private_header,
 730                       skb->len,
 731                       kaweth_usb_transmit_complete,
 732                       kaweth);
 733         kaweth->end = 0;
 734
 735         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 736         {
 737                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 738 skip:
 739                 net->stats.tx_errors++;
 740
 741                 netif_start_queue(net);
 742                 dev_kfree_skb_irq(skb);
 743         }
 744         else
 745         {
 746                 net->stats.tx_packets++;
 747                 net->stats.tx_bytes += skb->len;
 748         }
 749
 750         spin_unlock_irq(&kaweth->device_lock);
 751
 752         return NETDEV_TX_OK;
 753 }
 754
 755 /****************************************************************
 756  *     kaweth_set_rx_mode
 757  ****************************************************************/
 758 static void kaweth_set_rx_mode(struct net_device *net)
 759 {
 760         struct kaweth_device *kaweth = netdev_priv(net);
 761
 762         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 763                                      KAWETH_PACKET_FILTER_BROADCAST |
 764                                      KAWETH_PACKET_FILTER_MULTICAST;
 765
 766         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 767
 768         netif_stop_queue(net);
 769
 770         if (net->flags & IFF_PROMISC) {
 771                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 772         }
 773         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 774                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 775         }
 776
 777         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 778         netif_wake_queue(net);
 779 }
 780
 781 /****************************************************************
 782  *     kaweth_async_set_rx_mode
 783  ****************************************************************/
 784 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth,
 785                                      bool may_sleep)
 786 {
 787         int ret;
 788         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 789
 790         kaweth->packet_filter_bitmap = 0;
 791         if (packet_filter_bitmap == 0)
 792                 return;
 793
 794         if (!may_sleep)
 795                 return;
 796
 797         ret = usb_control_msg(kaweth->dev, usb_sndctrlpipe(kaweth->dev, 0),
 798                               KAWETH_COMMAND_SET_PACKET_FILTER,
 799                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 800                               packet_filter_bitmap, 0,
 801                               &kaweth->scratch, 0,
 802                               KAWETH_CONTROL_TIMEOUT);
 803         if (ret < 0)
 804                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 805                         ret);
 806         else
 807                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 808                            packet_filter_bitmap);
 809 }
 810
 811 /****************************************************************
 812  *     kaweth_tx_timeout
 813  ****************************************************************/
 814 static void kaweth_tx_timeout(struct net_device *net, unsigned int txqueue)
 815 {
 816         struct kaweth_device *kaweth = netdev_priv(net);
 817
 818         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 819         net->stats.tx_errors++;
 820         netif_trans_update(net);
 821
 822         usb_unlink_urb(kaweth->tx_urb);
 823 }
 824
 825 /****************************************************************
 826  *     kaweth_suspend
 827  ****************************************************************/
 828 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 829 {
 830         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 831         unsigned long flags;
 832
 833         spin_lock_irqsave(&kaweth->device_lock, flags);
 834         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 835         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 836
 837         kaweth_kill_urbs(kaweth);
 838         return 0;
 839 }
 840
 841 /****************************************************************
 842  *     kaweth_resume
 843  ****************************************************************/
 844 static int kaweth_resume(struct usb_interface *intf)
 845 {
 846         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 847         unsigned long flags;
 848
 849         spin_lock_irqsave(&kaweth->device_lock, flags);
 850         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 851         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 852
 853         if (!kaweth->opened)
 854                 return 0;
 855         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 856         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 857
 858         return 0;
 859 }
 860
 861 /****************************************************************
 862  *     kaweth_probe
 863  ****************************************************************/
 864
 865
 866 static const struct net_device_ops kaweth_netdev_ops = {
 867         .ndo_open =                     kaweth_open,
 868         .ndo_stop =                     kaweth_close,
 869         .ndo_start_xmit =               kaweth_start_xmit,
 870         .ndo_tx_timeout =               kaweth_tx_timeout,
 871         .ndo_set_rx_mode =              kaweth_set_rx_mode,
 872         .ndo_set_mac_address =          eth_mac_addr,
 873         .ndo_validate_addr =            eth_validate_addr,
 874 };
 875
 876 static int kaweth_probe(
 877                 struct usb_interface *intf,
 878                 const struct usb_device_id *id      /* from id_table */
 879         )
 880 {
 881         struct device *dev = &intf->dev;
 882         struct usb_device *udev = interface_to_usbdev(intf);
 883         struct kaweth_device *kaweth;
 884         struct net_device *netdev;
 885         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 886         int result = 0;
 887         int rv = -EIO;
 888
 889         dev_dbg(dev,
 890                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
 891                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
 892                 le16_to_cpu(udev->descriptor.idProduct),
 893                 le16_to_cpu(udev->descriptor.bcdDevice));
 894
 895         dev_dbg(dev, "Device at %p\n", udev);
 896
 897         dev_dbg(dev, "Descriptor length: %x type: %x\n",
 898                 (int)udev->descriptor.bLength,
 899                 (int)udev->descriptor.bDescriptorType);
 900
 901         netdev = alloc_etherdev(sizeof(*kaweth));
 902         if (!netdev)
 903                 return -ENOMEM;
 904
 905         kaweth = netdev_priv(netdev);
 906         kaweth->dev = udev;
 907         kaweth->net = netdev;
 908         kaweth->intf = intf;
 909
 910         spin_lock_init(&kaweth->device_lock);
 911         init_waitqueue_head(&kaweth->term_wait);
 912
 913         dev_dbg(dev, "Resetting.\n");
 914
 915         kaweth_reset(kaweth);
 916
 917         /*
 918          * If high byte of bcdDevice is nonzero, firmware is already
 919          * downloaded. Don't try to do it again, or we'll hang the device.
 920          */
 921
 922         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
 923                 dev_info(dev, "Firmware present in device.\n");
 924         } else {
 925                 /* Download the firmware */
 926                 dev_info(dev, "Downloading firmware...\n");
 927                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
 928                 if (!kaweth->firmware_buf) {
 929                         rv = -ENOMEM;
 930                         goto err_free_netdev;
 931                 }
 932                 if ((result = kaweth_download_firmware(kaweth,
 933                                                       "kaweth/new_code.bin",
 934                                                       100,
 935                                                       2)) < 0) {
 936                         dev_err(dev, "Error downloading firmware (%d)\n",
 937                                 result);
 938                         goto err_fw;
 939                 }
 940
 941                 if ((result = kaweth_download_firmware(kaweth,
 942                                                       "kaweth/new_code_fix.bin",
 943                                                       100,
 944                                                       3)) < 0) {
 945                         dev_err(dev, "Error downloading firmware fix (%d)\n",
 946                                 result);
 947                         goto err_fw;
 948                 }
 949
 950                 if ((result = kaweth_download_firmware(kaweth,
 951                                                       "kaweth/trigger_code.bin",
 952                                                       126,
 953                                                       2)) < 0) {
 954                         dev_err(dev, "Error downloading trigger code (%d)\n",
 955                                 result);
 956                         goto err_fw;
 957
 958                 }
 959
 960                 if ((result = kaweth_download_firmware(kaweth,
 961                                                       "kaweth/trigger_code_fix.bin",
 962                                                       126,
 963                                                       3)) < 0) {
 964                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
 965                         goto err_fw;
 966                 }
 967
 968
 969                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
 970                         dev_err(dev, "Error triggering firmware (%d)\n", result);
 971                         goto err_fw;
 972                 }
 973
 974                 /* Device will now disappear for a moment...  */
 975                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
 976 err_fw:
 977                 free_page((unsigned long)kaweth->firmware_buf);
 978                 free_netdev(netdev);
 979                 return -EIO;
 980         }
 981
 982         result = kaweth_read_configuration(kaweth);
 983
 984         if(result < 0) {
 985                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
 986                 goto err_free_netdev;
 987         }
 988
 989         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
 990         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
 991         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
 992         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
 993
 994         if(!memcmp(&kaweth->configuration.hw_addr,
 995                    &bcast_addr,
 996                    sizeof(bcast_addr))) {
 997                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
 998                 goto err_free_netdev;
 999         }
1000
1001         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1002                 dev_dbg(dev, "Error setting URB size\n");
1003                 goto err_free_netdev;
1004         }
1005
1006         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1007                 dev_err(dev, "Error setting SOFS wait\n");
1008                 goto err_free_netdev;
1009         }
1010
1011         result = kaweth_set_receive_filter(kaweth,
1012                                            KAWETH_PACKET_FILTER_DIRECTED |
1013                                            KAWETH_PACKET_FILTER_BROADCAST |
1014                                            KAWETH_PACKET_FILTER_MULTICAST);
1015
1016         if(result < 0) {
1017                 dev_err(dev, "Error setting receive filter\n");
1018                 goto err_free_netdev;
1019         }
1020
1021         dev_dbg(dev, "Initializing net device.\n");
1022
1023         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1024         if (!kaweth->tx_urb)
1025                 goto err_free_netdev;
1026         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1027         if (!kaweth->rx_urb)
1028                 goto err_only_tx;
1029         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1030         if (!kaweth->irq_urb)
1031                 goto err_tx_and_rx;
1032
1033         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1034                                                 INTBUFFERSIZE,
1035                                                 GFP_KERNEL,
1036                                                 &kaweth->intbufferhandle);
1037         if (!kaweth->intbuffer)
1038                 goto err_tx_and_rx_and_irq;
1039         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1040                                                 KAWETH_BUF_SIZE,
1041                                                 GFP_KERNEL,
1042                                                 &kaweth->rxbufferhandle);
1043         if (!kaweth->rx_buf)
1044                 goto err_all_but_rxbuf;
1045
1046         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1047         eth_hw_addr_set(netdev, (u8 *)&kaweth->configuration.hw_addr);
1048
1049         netdev->netdev_ops = &kaweth_netdev_ops;
1050         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1051         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1052         netdev->ethtool_ops = &ops;
1053
1054         /* kaweth is zeroed as part of alloc_netdev */
1055         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1056         usb_set_intfdata(intf, kaweth);
1057
1058         SET_NETDEV_DEV(netdev, dev);
1059         if (register_netdev(netdev) != 0) {
1060                 dev_err(dev, "Error registering netdev.\n");
1061                 goto err_intfdata;
1062         }
1063
1064         dev_info(dev, "kaweth interface created at %s\n",
1065                  kaweth->net->name);
1066
1067         return 0;
1068
1069 err_intfdata:
1070         usb_set_intfdata(intf, NULL);
1071         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1072 err_all_but_rxbuf:
1073         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1074 err_tx_and_rx_and_irq:
1075         usb_free_urb(kaweth->irq_urb);
1076 err_tx_and_rx:
1077         usb_free_urb(kaweth->rx_urb);
1078 err_only_tx:
1079         usb_free_urb(kaweth->tx_urb);
1080 err_free_netdev:
1081         free_netdev(netdev);
1082
1083         return rv;
1084 }
1085
1086 /****************************************************************
1087  *     kaweth_disconnect
1088  ****************************************************************/
1089 static void kaweth_disconnect(struct usb_interface *intf)
1090 {
1091         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1092         struct net_device *netdev;
1093
1094         usb_set_intfdata(intf, NULL);
1095         if (!kaweth) {
1096                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1097                 return;
1098         }
1099         netdev = kaweth->net;
1100
1101         netdev_dbg(kaweth->net, "Unregistering net device\n");
1102         unregister_netdev(netdev);
1103
1104         usb_free_urb(kaweth->rx_urb);
1105         usb_free_urb(kaweth->tx_urb);
1106         usb_free_urb(kaweth->irq_urb);
1107
1108         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1109         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1110
1111         free_netdev(netdev);
1112 }
1113
1114
1115 module_usb_driver(kaweth_driver);