nosy.c

   1 /*
   2  * nosy - Snoop mode driver for TI PCILynx 1394 controllers
   3  * Copyright (C) 2002-2007 Kristian Høgsberg
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/errno.h>
  22 #include <linux/fs.h>
  23 #include <linux/init.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/io.h>
  26 #include <linux/kernel.h>
  27 #include <linux/kref.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/module.h>
  30 #include <linux/mutex.h>
  31 #include <linux/pci.h>
  32 #include <linux/poll.h>
  33 #include <linux/sched.h> /* required for linux/wait.h */
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/time64.h>
  37 #include <linux/timex.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/wait.h>
  40 #include <linux/dma-mapping.h>
  41 #include <linux/atomic.h>
  42 #include <asm/byteorder.h>
  43
  44 #include "nosy.h"
  45 #include "nosy-user.h"
  46
  47 #define TCODE_PHY_PACKET                0x10
  48 #define PCI_DEVICE_ID_TI_PCILYNX        0x8000
  49
  50 static char driver_name[] = KBUILD_MODNAME;
  51
  52 /* this is the physical layout of a PCL, its size is 128 bytes */
  53 struct pcl {
  54         __le32 next;
  55         __le32 async_error_next;
  56         u32 user_data;
  57         __le32 pcl_status;
  58         __le32 remaining_transfer_count;
  59         __le32 next_data_buffer;
  60         struct {
  61                 __le32 control;
  62                 __le32 pointer;
  63         } buffer[13];
  64 };
  65
  66 struct packet {
  67         unsigned int length;
  68         char data[0];
  69 };
  70
  71 struct packet_buffer {
  72         char *data;
  73         size_t capacity;
  74         long total_packet_count, lost_packet_count;
  75         atomic_t size;
  76         struct packet *head, *tail;
  77         wait_queue_head_t wait;
  78 };
  79
  80 struct pcilynx {
  81         struct pci_dev *pci_device;
  82         __iomem char *registers;
  83
  84         struct pcl *rcv_start_pcl, *rcv_pcl;
  85         __le32 *rcv_buffer;
  86
  87         dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
  88
  89         spinlock_t client_list_lock;
  90         struct list_head client_list;
  91
  92         struct miscdevice misc;
  93         struct list_head link;
  94         struct kref kref;
  95 };
  96
  97 static inline struct pcilynx *
  98 lynx_get(struct pcilynx *lynx)
  99 {
 100         kref_get(&lynx->kref);
 101
 102         return lynx;
 103 }
 104
 105 static void
 106 lynx_release(struct kref *kref)
 107 {
 108         kfree(container_of(kref, struct pcilynx, kref));
 109 }
 110
 111 static inline void
 112 lynx_put(struct pcilynx *lynx)
 113 {
 114         kref_put(&lynx->kref, lynx_release);
 115 }
 116
 117 struct client {
 118         struct pcilynx *lynx;
 119         u32 tcode_mask;
 120         struct packet_buffer buffer;
 121         struct list_head link;
 122 };
 123
 124 static DEFINE_MUTEX(card_mutex);
 125 static LIST_HEAD(card_list);
 126
 127 static int
 128 packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
 129 {
 130         buffer->data = kmalloc(capacity, GFP_KERNEL);
 131         if (buffer->data == NULL)
 132                 return -ENOMEM;
 133         buffer->head = (struct packet *) buffer->data;
 134         buffer->tail = (struct packet *) buffer->data;
 135         buffer->capacity = capacity;
 136         buffer->lost_packet_count = 0;
 137         atomic_set(&buffer->size, 0);
 138         init_waitqueue_head(&buffer->wait);
 139
 140         return 0;
 141 }
 142
 143 static void
 144 packet_buffer_destroy(struct packet_buffer *buffer)
 145 {
 146         kfree(buffer->data);
 147 }
 148
 149 static int
 150 packet_buffer_get(struct client *client, char __user *data, size_t user_length)
 151 {
 152         struct packet_buffer *buffer = &client->buffer;
 153         size_t length;
 154         char *end;
 155
 156         if (wait_event_interruptible(buffer->wait,
 157                                      atomic_read(&buffer->size) > 0) ||
 158                                      list_empty(&client->lynx->link))
 159                 return -ERESTARTSYS;
 160
 161         if (atomic_read(&buffer->size) == 0)
 162                 return -ENODEV;
 163
 164         length = buffer->head->length;
 165
 166         if (length > user_length)
 167                 return 0;
 168
 169         end = buffer->data + buffer->capacity;
 170
 171         if (&buffer->head->data[length] < end) {
 172                 if (copy_to_user(data, buffer->head->data, length))
 173                         return -EFAULT;
 174                 buffer->head = (struct packet *) &buffer->head->data[length];
 175         } else {
 176                 size_t split = end - buffer->head->data;
 177
 178                 if (copy_to_user(data, buffer->head->data, split))
 179                         return -EFAULT;
 180                 if (copy_to_user(data + split, buffer->data, length - split))
 181                         return -EFAULT;
 182                 buffer->head = (struct packet *) &buffer->data[length - split];
 183         }
 184
 185         /*
 186          * Decrease buffer->size as the last thing, since this is what
 187          * keeps the interrupt from overwriting the packet we are
 188          * retrieving from the buffer.
 189          */
 190         atomic_sub(sizeof(struct packet) + length, &buffer->size);
 191
 192         return length;
 193 }
 194
 195 static void
 196 packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
 197 {
 198         char *end;
 199
 200         buffer->total_packet_count++;
 201
 202         if (buffer->capacity <
 203             atomic_read(&buffer->size) + sizeof(struct packet) + length) {
 204                 buffer->lost_packet_count++;
 205                 return;
 206         }
 207
 208         end = buffer->data + buffer->capacity;
 209         buffer->tail->length = length;
 210
 211         if (&buffer->tail->data[length] < end) {
 212                 memcpy(buffer->tail->data, data, length);
 213                 buffer->tail = (struct packet *) &buffer->tail->data[length];
 214         } else {
 215                 size_t split = end - buffer->tail->data;
 216
 217                 memcpy(buffer->tail->data, data, split);
 218                 memcpy(buffer->data, data + split, length - split);
 219                 buffer->tail = (struct packet *) &buffer->data[length - split];
 220         }
 221
 222         /* Finally, adjust buffer size and wake up userspace reader. */
 223
 224         atomic_add(sizeof(struct packet) + length, &buffer->size);
 225         wake_up_interruptible(&buffer->wait);
 226 }
 227
 228 static inline void
 229 reg_write(struct pcilynx *lynx, int offset, u32 data)
 230 {
 231         writel(data, lynx->registers + offset);
 232 }
 233
 234 static inline u32
 235 reg_read(struct pcilynx *lynx, int offset)
 236 {
 237         return readl(lynx->registers + offset);
 238 }
 239
 240 static inline void
 241 reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
 242 {
 243         reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
 244 }
 245
 246 /*
 247  * Maybe the pcl programs could be set up to just append data instead
 248  * of using a whole packet.
 249  */
 250 static inline void
 251 run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
 252                            int dmachan)
 253 {
 254         reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
 255         reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
 256                   DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
 257 }
 258
 259 static int
 260 set_phy_reg(struct pcilynx *lynx, int addr, int val)
 261 {
 262         if (addr > 15) {
 263                 dev_err(&lynx->pci_device->dev,
 264                         "PHY register address %d out of range\n", addr);
 265                 return -1;
 266         }
 267         if (val > 0xff) {
 268                 dev_err(&lynx->pci_device->dev,
 269                         "PHY register value %d out of range\n", val);
 270                 return -1;
 271         }
 272         reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
 273                   LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
 274
 275         return 0;
 276 }
 277
 278 static int
 279 nosy_open(struct inode *inode, struct file *file)
 280 {
 281         int minor = iminor(inode);
 282         struct client *client;
 283         struct pcilynx *tmp, *lynx = NULL;
 284
 285         mutex_lock(&card_mutex);
 286         list_for_each_entry(tmp, &card_list, link)
 287                 if (tmp->misc.minor == minor) {
 288                         lynx = lynx_get(tmp);
 289                         break;
 290                 }
 291         mutex_unlock(&card_mutex);
 292         if (lynx == NULL)
 293                 return -ENODEV;
 294
 295         client = kmalloc(sizeof *client, GFP_KERNEL);
 296         if (client == NULL)
 297                 goto fail;
 298
 299         client->tcode_mask = ~0;
 300         client->lynx = lynx;
 301         INIT_LIST_HEAD(&client->link);
 302
 303         if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
 304                 goto fail;
 305
 306         file->private_data = client;
 307
 308         return nonseekable_open(inode, file);
 309 fail:
 310         kfree(client);
 311         lynx_put(lynx);
 312
 313         return -ENOMEM;
 314 }
 315
 316 static int
 317 nosy_release(struct inode *inode, struct file *file)
 318 {
 319         struct client *client = file->private_data;
 320         struct pcilynx *lynx = client->lynx;
 321
 322         spin_lock_irq(&lynx->client_list_lock);
 323         list_del_init(&client->link);
 324         spin_unlock_irq(&lynx->client_list_lock);
 325
 326         packet_buffer_destroy(&client->buffer);
 327         kfree(client);
 328         lynx_put(lynx);
 329
 330         return 0;
 331 }
 332
 333 static __poll_t
 334 nosy_poll(struct file *file, poll_table *pt)
 335 {
 336         struct client *client = file->private_data;
 337         __poll_t ret = 0;
 338
 339         poll_wait(file, &client->buffer.wait, pt);
 340
 341         if (atomic_read(&client->buffer.size) > 0)
 342                 ret = EPOLLIN | EPOLLRDNORM;
 343
 344         if (list_empty(&client->lynx->link))
 345                 ret |= EPOLLHUP;
 346
 347         return ret;
 348 }
 349
 350 static ssize_t
 351 nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
 352 {
 353         struct client *client = file->private_data;
 354
 355         return packet_buffer_get(client, buffer, count);
 356 }
 357
 358 static long
 359 nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 360 {
 361         struct client *client = file->private_data;
 362         spinlock_t *client_list_lock = &client->lynx->client_list_lock;
 363         struct nosy_stats stats;
 364         int ret;
 365
 366         switch (cmd) {
 367         case NOSY_IOC_GET_STATS:
 368                 spin_lock_irq(client_list_lock);
 369                 stats.total_packet_count = client->buffer.total_packet_count;
 370                 stats.lost_packet_count  = client->buffer.lost_packet_count;
 371                 spin_unlock_irq(client_list_lock);
 372
 373                 if (copy_to_user((void __user *) arg, &stats, sizeof stats))
 374                         return -EFAULT;
 375                 else
 376                         return 0;
 377
 378         case NOSY_IOC_START:
 379                 ret = -EBUSY;
 380                 spin_lock_irq(client_list_lock);
 381                 if (list_empty(&client->link)) {
 382                         list_add_tail(&client->link, &client->lynx->client_list);
 383                         ret = 0;
 384                 }
 385                 spin_unlock_irq(client_list_lock);
 386
 387                 return ret;
 388
 389         case NOSY_IOC_STOP:
 390                 spin_lock_irq(client_list_lock);
 391                 list_del_init(&client->link);
 392                 spin_unlock_irq(client_list_lock);
 393
 394                 return 0;
 395
 396         case NOSY_IOC_FILTER:
 397                 spin_lock_irq(client_list_lock);
 398                 client->tcode_mask = arg;
 399                 spin_unlock_irq(client_list_lock);
 400
 401                 return 0;
 402
 403         default:
 404                 return -EINVAL;
 405                 /* Flush buffer, configure filter. */
 406         }
 407 }
 408
 409 static const struct file_operations nosy_ops = {
 410         .owner =                THIS_MODULE,
 411         .read =                 nosy_read,
 412         .unlocked_ioctl =       nosy_ioctl,
 413         .poll =                 nosy_poll,
 414         .open =                 nosy_open,
 415         .release =              nosy_release,
 416 };
 417
 418 #define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
 419
 420 static void
 421 packet_irq_handler(struct pcilynx *lynx)
 422 {
 423         struct client *client;
 424         u32 tcode_mask, tcode, timestamp;
 425         size_t length;
 426         struct timespec64 ts64;
 427
 428         /* FIXME: Also report rcv_speed. */
 429
 430         length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
 431         tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
 432
 433         ktime_get_real_ts64(&ts64);
 434         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 435         lynx->rcv_buffer[0] = (__force __le32)timestamp;
 436
 437         if (length == PHY_PACKET_SIZE)
 438                 tcode_mask = 1 << TCODE_PHY_PACKET;
 439         else
 440                 tcode_mask = 1 << tcode;
 441
 442         spin_lock(&lynx->client_list_lock);
 443
 444         list_for_each_entry(client, &lynx->client_list, link)
 445                 if (client->tcode_mask & tcode_mask)
 446                         packet_buffer_put(&client->buffer,
 447                                           lynx->rcv_buffer, length + 4);
 448
 449         spin_unlock(&lynx->client_list_lock);
 450 }
 451
 452 static void
 453 bus_reset_irq_handler(struct pcilynx *lynx)
 454 {
 455         struct client *client;
 456         struct timespec64 ts64;
 457         u32    timestamp;
 458
 459         ktime_get_real_ts64(&ts64);
 460         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 461
 462         spin_lock(&lynx->client_list_lock);
 463
 464         list_for_each_entry(client, &lynx->client_list, link)
 465                 packet_buffer_put(&client->buffer, &timestamp, 4);
 466
 467         spin_unlock(&lynx->client_list_lock);
 468 }
 469
 470 static irqreturn_t
 471 irq_handler(int irq, void *device)
 472 {
 473         struct pcilynx *lynx = device;
 474         u32 pci_int_status;
 475
 476         pci_int_status = reg_read(lynx, PCI_INT_STATUS);
 477
 478         if (pci_int_status == ~0)
 479                 /* Card was ejected. */
 480                 return IRQ_NONE;
 481
 482         if ((pci_int_status & PCI_INT_INT_PEND) == 0)
 483                 /* Not our interrupt, bail out quickly. */
 484                 return IRQ_NONE;
 485
 486         if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
 487                 u32 link_int_status;
 488
 489                 link_int_status = reg_read(lynx, LINK_INT_STATUS);
 490                 reg_write(lynx, LINK_INT_STATUS, link_int_status);
 491
 492                 if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
 493                         bus_reset_irq_handler(lynx);
 494         }
 495
 496         /* Clear the PCI_INT_STATUS register only after clearing the
 497          * LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
 498          * be set again immediately. */
 499
 500         reg_write(lynx, PCI_INT_STATUS, pci_int_status);
 501
 502         if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
 503                 packet_irq_handler(lynx);
 504                 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 505         }
 506
 507         return IRQ_HANDLED;
 508 }
 509
 510 static void
 511 remove_card(struct pci_dev *dev)
 512 {
 513         struct pcilynx *lynx = pci_get_drvdata(dev);
 514         struct client *client;
 515
 516         mutex_lock(&card_mutex);
 517         list_del_init(&lynx->link);
 518         misc_deregister(&lynx->misc);
 519         mutex_unlock(&card_mutex);
 520
 521         reg_write(lynx, PCI_INT_ENABLE, 0);
 522         free_irq(lynx->pci_device->irq, lynx);
 523
 524         spin_lock_irq(&lynx->client_list_lock);
 525         list_for_each_entry(client, &lynx->client_list, link)
 526                 wake_up_interruptible(&client->buffer.wait);
 527         spin_unlock_irq(&lynx->client_list_lock);
 528
 529         pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 530                             lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 531         pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 532                             lynx->rcv_pcl, lynx->rcv_pcl_bus);
 533         pci_free_consistent(lynx->pci_device, PAGE_SIZE,
 534                             lynx->rcv_buffer, lynx->rcv_buffer_bus);
 535
 536         iounmap(lynx->registers);
 537         pci_disable_device(dev);
 538         lynx_put(lynx);
 539 }
 540
 541 #define RCV_BUFFER_SIZE (16 * 1024)
 542
 543 static int
 544 add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 545 {
 546         struct pcilynx *lynx;
 547         u32 p, end;
 548         int ret, i;
 549
 550         if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
 551                 dev_err(&dev->dev,
 552                     "DMA address limits not supported for PCILynx hardware\n");
 553                 return -ENXIO;
 554         }
 555         if (pci_enable_device(dev)) {
 556                 dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
 557                 return -ENXIO;
 558         }
 559         pci_set_master(dev);
 560
 561         lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
 562         if (lynx == NULL) {
 563                 dev_err(&dev->dev, "Failed to allocate control structure\n");
 564                 ret = -ENOMEM;
 565                 goto fail_disable;
 566         }
 567         lynx->pci_device = dev;
 568         pci_set_drvdata(dev, lynx);
 569
 570         spin_lock_init(&lynx->client_list_lock);
 571         INIT_LIST_HEAD(&lynx->client_list);
 572         kref_init(&lynx->kref);
 573
 574         lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
 575                                           PCILYNX_MAX_REGISTER);
 576         if (lynx->registers == NULL) {
 577                 dev_err(&dev->dev, "Failed to map registers\n");
 578                 ret = -ENOMEM;
 579                 goto fail_deallocate_lynx;
 580         }
 581
 582         lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
 583                                 sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
 584         lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
 585                                 sizeof(struct pcl), &lynx->rcv_pcl_bus);
 586         lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
 587                                 RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
 588         if (lynx->rcv_start_pcl == NULL ||
 589             lynx->rcv_pcl == NULL ||
 590             lynx->rcv_buffer == NULL) {
 591                 dev_err(&dev->dev, "Failed to allocate receive buffer\n");
 592                 ret = -ENOMEM;
 593                 goto fail_deallocate_buffers;
 594         }
 595         lynx->rcv_start_pcl->next       = cpu_to_le32(lynx->rcv_pcl_bus);
 596         lynx->rcv_pcl->next             = cpu_to_le32(PCL_NEXT_INVALID);
 597         lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
 598
 599         lynx->rcv_pcl->buffer[0].control =
 600                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
 601         lynx->rcv_pcl->buffer[0].pointer =
 602                         cpu_to_le32(lynx->rcv_buffer_bus + 4);
 603         p = lynx->rcv_buffer_bus + 2048;
 604         end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
 605         for (i = 1; p < end; i++, p += 2048) {
 606                 lynx->rcv_pcl->buffer[i].control =
 607                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
 608                 lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
 609         }
 610         lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
 611
 612         reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
 613         /* Fix buggy cards with autoboot pin not tied low: */
 614         reg_write(lynx, DMA0_CHAN_CTRL, 0);
 615         reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
 616
 617 #if 0
 618         /* now, looking for PHY register set */
 619         if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
 620                 lynx->phyic.reg_1394a = 1;
 621                 PRINT(KERN_INFO, lynx->id,
 622                       "found 1394a conform PHY (using extended register set)");
 623                 lynx->phyic.vendor = get_phy_vendorid(lynx);
 624                 lynx->phyic.product = get_phy_productid(lynx);
 625         } else {
 626                 lynx->phyic.reg_1394a = 0;
 627                 PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
 628         }
 629 #endif
 630
 631         /* Setup the general receive FIFO max size. */
 632         reg_write(lynx, FIFO_SIZES, 255);
 633
 634         reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
 635
 636         reg_write(lynx, LINK_INT_ENABLE,
 637                   LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
 638                   LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
 639                   LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
 640                   LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
 641                   LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
 642
 643         /* Disable the L flag in self ID packets. */
 644         set_phy_reg(lynx, 4, 0);
 645
 646         /* Put this baby into snoop mode */
 647         reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
 648
 649         run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 650
 651         if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
 652                         driver_name, lynx)) {
 653                 dev_err(&dev->dev,
 654                         "Failed to allocate shared interrupt %d\n", dev->irq);
 655                 ret = -EIO;
 656                 goto fail_deallocate_buffers;
 657         }
 658
 659         lynx->misc.parent = &dev->dev;
 660         lynx->misc.minor = MISC_DYNAMIC_MINOR;
 661         lynx->misc.name = "nosy";
 662         lynx->misc.fops = &nosy_ops;
 663
 664         mutex_lock(&card_mutex);
 665         ret = misc_register(&lynx->misc);
 666         if (ret) {
 667                 dev_err(&dev->dev, "Failed to register misc char device\n");
 668                 mutex_unlock(&card_mutex);
 669                 goto fail_free_irq;
 670         }
 671         list_add_tail(&lynx->link, &card_list);
 672         mutex_unlock(&card_mutex);
 673
 674         dev_info(&dev->dev,
 675                  "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
 676
 677         return 0;
 678
 679 fail_free_irq:
 680         reg_write(lynx, PCI_INT_ENABLE, 0);
 681         free_irq(lynx->pci_device->irq, lynx);
 682
 683 fail_deallocate_buffers:
 684         if (lynx->rcv_start_pcl)
 685                 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 686                                 lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 687         if (lynx->rcv_pcl)
 688                 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 689                                 lynx->rcv_pcl, lynx->rcv_pcl_bus);
 690         if (lynx->rcv_buffer)
 691                 pci_free_consistent(lynx->pci_device, PAGE_SIZE,
 692                                 lynx->rcv_buffer, lynx->rcv_buffer_bus);
 693         iounmap(lynx->registers);
 694
 695 fail_deallocate_lynx:
 696         kfree(lynx);
 697
 698 fail_disable:
 699         pci_disable_device(dev);
 700
 701         return ret;
 702 }
 703
 704 static struct pci_device_id pci_table[] = {
 705         {
 706                 .vendor =    PCI_VENDOR_ID_TI,
 707                 .device =    PCI_DEVICE_ID_TI_PCILYNX,
 708                 .subvendor = PCI_ANY_ID,
 709                 .subdevice = PCI_ANY_ID,
 710         },
 711         { }     /* Terminating entry */
 712 };
 713
 714 MODULE_DEVICE_TABLE(pci, pci_table);
 715
 716 static struct pci_driver lynx_pci_driver = {
 717         .name =         driver_name,
 718         .id_table =     pci_table,
 719         .probe =        add_card,
 720         .remove =       remove_card,
 721 };
 722
 723 module_pci_driver(lynx_pci_driver);
 724
 725 MODULE_AUTHOR("Kristian Hoegsberg");
 726 MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
 727 MODULE_LICENSE("GPL");