drivers/bluetooth/dtl1_cs.c

   1 /*
   2  *
   3  *  A driver for Nokia Connectivity Card DTL-1 devices
   4  *
   5  *  Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation;
  11  *
  12  *  Software distributed under the License is distributed on an "AS
  13  *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  14  *  implied. See the License for the specific language governing
  15  *  rights and limitations under the License.
  16  *
  17  *  The initial developer of the original code is David A. Hinds
  18  *  <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  19  *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  20  *
  21  */
  22
  23 #include <linux/module.h>
  24
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/types.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/ptrace.h>
  32 #include <linux/ioport.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/moduleparam.h>
  35
  36 #include <linux/skbuff.h>
  37 #include <linux/string.h>
  38 #include <linux/serial.h>
  39 #include <linux/serial_reg.h>
  40 #include <linux/bitops.h>
  41 #include <asm/system.h>
  42 #include <asm/io.h>
  43
  44 #include <pcmcia/cs_types.h>
  45 #include <pcmcia/cs.h>
  46 #include <pcmcia/cistpl.h>
  47 #include <pcmcia/ciscode.h>
  48 #include <pcmcia/ds.h>
  49 #include <pcmcia/cisreg.h>
  50
  51 #include <net/bluetooth/bluetooth.h>
  52 #include <net/bluetooth/hci_core.h>
  53
  54
  55
  56 /* ======================== Module parameters ======================== */
  57
  58
  59 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  60 MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
  61 MODULE_LICENSE("GPL");
  62
  63
  64
  65 /* ======================== Local structures ======================== */
  66
  67
  68 typedef struct dtl1_info_t {
  69         struct pcmcia_device *p_dev;
  70
  71         struct hci_dev *hdev;
  72
  73         spinlock_t lock;                /* For serializing operations */
  74
  75         unsigned long flowmask;         /* HCI flow mask */
  76         int ri_latch;
  77
  78         struct sk_buff_head txq;
  79         unsigned long tx_state;
  80
  81         unsigned long rx_state;
  82         unsigned long rx_count;
  83         struct sk_buff *rx_skb;
  84 } dtl1_info_t;
  85
  86
  87 static int dtl1_config(struct pcmcia_device *link);
  88 static void dtl1_release(struct pcmcia_device *link);
  89
  90 static void dtl1_detach(struct pcmcia_device *p_dev);
  91
  92
  93 /* Transmit states  */
  94 #define XMIT_SENDING  1
  95 #define XMIT_WAKEUP   2
  96 #define XMIT_WAITING  8
  97
  98 /* Receiver States */
  99 #define RECV_WAIT_NSH   0
 100 #define RECV_WAIT_DATA  1
 101
 102
 103 typedef struct {
 104         u8 type;
 105         u8 zero;
 106         u16 len;
 107 } __attribute__ ((packed)) nsh_t;       /* Nokia Specific Header */
 108
 109 #define NSHL  4                         /* Nokia Specific Header Length */
 110
 111
 112
 113 /* ======================== Interrupt handling ======================== */
 114
 115
 116 static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 117 {
 118         int actual = 0;
 119
 120         /* Tx FIFO should be empty */
 121         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
 122                 return 0;
 123
 124         /* Fill FIFO with current frame */
 125         while ((fifo_size-- > 0) && (actual < len)) {
 126                 /* Transmit next byte */
 127                 outb(buf[actual], iobase + UART_TX);
 128                 actual++;
 129         }
 130
 131         return actual;
 132 }
 133
 134
 135 static void dtl1_write_wakeup(dtl1_info_t *info)
 136 {
 137         if (!info) {
 138                 BT_ERR("Unknown device");
 139                 return;
 140         }
 141
 142         if (test_bit(XMIT_WAITING, &(info->tx_state))) {
 143                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 144                 return;
 145         }
 146
 147         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
 148                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 149                 return;
 150         }
 151
 152         do {
 153                 register unsigned int iobase = info->p_dev->io.BasePort1;
 154                 register struct sk_buff *skb;
 155                 register int len;
 156
 157                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
 158
 159                 if (!pcmcia_dev_present(info->p_dev))
 160                         return;
 161
 162                 if (!(skb = skb_dequeue(&(info->txq))))
 163                         break;
 164
 165                 /* Send frame */
 166                 len = dtl1_write(iobase, 32, skb->data, skb->len);
 167
 168                 if (len == skb->len) {
 169                         set_bit(XMIT_WAITING, &(info->tx_state));
 170                         kfree_skb(skb);
 171                 } else {
 172                         skb_pull(skb, len);
 173                         skb_queue_head(&(info->txq), skb);
 174                 }
 175
 176                 info->hdev->stat.byte_tx += len;
 177
 178         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 179
 180         clear_bit(XMIT_SENDING, &(info->tx_state));
 181 }
 182
 183
 184 static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
 185 {
 186         u8 flowmask = *(u8 *)skb->data;
 187         int i;
 188
 189         printk(KERN_INFO "Bluetooth: Nokia control data =");
 190         for (i = 0; i < skb->len; i++) {
 191                 printk(" %02x", skb->data[i]);
 192         }
 193         printk("\n");
 194
 195         /* transition to active state */
 196         if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
 197                 clear_bit(XMIT_WAITING, &(info->tx_state));
 198                 dtl1_write_wakeup(info);
 199         }
 200
 201         info->flowmask = flowmask;
 202
 203         kfree_skb(skb);
 204 }
 205
 206
 207 static void dtl1_receive(dtl1_info_t *info)
 208 {
 209         unsigned int iobase;
 210         nsh_t *nsh;
 211         int boguscount = 0;
 212
 213         if (!info) {
 214                 BT_ERR("Unknown device");
 215                 return;
 216         }
 217
 218         iobase = info->p_dev->io.BasePort1;
 219
 220         do {
 221                 info->hdev->stat.byte_rx++;
 222
 223                 /* Allocate packet */
 224                 if (info->rx_skb == NULL)
 225                         if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
 226                                 BT_ERR("Can't allocate mem for new packet");
 227                                 info->rx_state = RECV_WAIT_NSH;
 228                                 info->rx_count = NSHL;
 229                                 return;
 230                         }
 231
 232                 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 233                 nsh = (nsh_t *)info->rx_skb->data;
 234
 235                 info->rx_count--;
 236
 237                 if (info->rx_count == 0) {
 238
 239                         switch (info->rx_state) {
 240                         case RECV_WAIT_NSH:
 241                                 info->rx_state = RECV_WAIT_DATA;
 242                                 info->rx_count = nsh->len + (nsh->len & 0x0001);
 243                                 break;
 244                         case RECV_WAIT_DATA:
 245                                 bt_cb(info->rx_skb)->pkt_type = nsh->type;
 246
 247                                 /* remove PAD byte if it exists */
 248                                 if (nsh->len & 0x0001) {
 249                                         info->rx_skb->tail--;
 250                                         info->rx_skb->len--;
 251                                 }
 252
 253                                 /* remove NSH */
 254                                 skb_pull(info->rx_skb, NSHL);
 255
 256                                 switch (bt_cb(info->rx_skb)->pkt_type) {
 257                                 case 0x80:
 258                                         /* control data for the Nokia Card */
 259                                         dtl1_control(info, info->rx_skb);
 260                                         break;
 261                                 case 0x82:
 262                                 case 0x83:
 263                                 case 0x84:
 264                                         /* send frame to the HCI layer */
 265                                         info->rx_skb->dev = (void *) info->hdev;
 266                                         bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 267                                         hci_recv_frame(info->rx_skb);
 268                                         break;
 269                                 default:
 270                                         /* unknown packet */
 271                                         BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 272                                         kfree_skb(info->rx_skb);
 273                                         break;
 274                                 }
 275
 276                                 info->rx_state = RECV_WAIT_NSH;
 277                                 info->rx_count = NSHL;
 278                                 info->rx_skb = NULL;
 279                                 break;
 280                         }
 281
 282                 }
 283
 284                 /* Make sure we don't stay here too long */
 285                 if (boguscount++ > 32)
 286                         break;
 287
 288         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 289 }
 290
 291
 292 static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 293 {
 294         dtl1_info_t *info = dev_inst;
 295         unsigned int iobase;
 296         unsigned char msr;
 297         int boguscount = 0;
 298         int iir, lsr;
 299         irqreturn_t r = IRQ_NONE;
 300
 301         if (!info || !info->hdev)
 302                 /* our irq handler is shared */
 303                 return IRQ_NONE;
 304
 305         iobase = info->p_dev->io.BasePort1;
 306
 307         spin_lock(&(info->lock));
 308
 309         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 310         while (iir) {
 311
 312                 r = IRQ_HANDLED;
 313                 /* Clear interrupt */
 314                 lsr = inb(iobase + UART_LSR);
 315
 316                 switch (iir) {
 317                 case UART_IIR_RLSI:
 318                         BT_ERR("RLSI");
 319                         break;
 320                 case UART_IIR_RDI:
 321                         /* Receive interrupt */
 322                         dtl1_receive(info);
 323                         break;
 324                 case UART_IIR_THRI:
 325                         if (lsr & UART_LSR_THRE) {
 326                                 /* Transmitter ready for data */
 327                                 dtl1_write_wakeup(info);
 328                         }
 329                         break;
 330                 default:
 331                         BT_ERR("Unhandled IIR=%#x", iir);
 332                         break;
 333                 }
 334
 335                 /* Make sure we don't stay here too long */
 336                 if (boguscount++ > 100)
 337                         break;
 338
 339                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 340
 341         }
 342
 343         msr = inb(iobase + UART_MSR);
 344
 345         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 346                 info->ri_latch = msr & UART_MSR_RI;
 347                 clear_bit(XMIT_WAITING, &(info->tx_state));
 348                 dtl1_write_wakeup(info);
 349                 r = IRQ_HANDLED;
 350         }
 351
 352         spin_unlock(&(info->lock));
 353
 354         return r;
 355 }
 356
 357
 358
 359 /* ======================== HCI interface ======================== */
 360
 361
 362 static int dtl1_hci_open(struct hci_dev *hdev)
 363 {
 364         set_bit(HCI_RUNNING, &(hdev->flags));
 365
 366         return 0;
 367 }
 368
 369
 370 static int dtl1_hci_flush(struct hci_dev *hdev)
 371 {
 372         dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
 373
 374         /* Drop TX queue */
 375         skb_queue_purge(&(info->txq));
 376
 377         return 0;
 378 }
 379
 380
 381 static int dtl1_hci_close(struct hci_dev *hdev)
 382 {
 383         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 384                 return 0;
 385
 386         dtl1_hci_flush(hdev);
 387
 388         return 0;
 389 }
 390
 391
 392 static int dtl1_hci_send_frame(struct sk_buff *skb)
 393 {
 394         dtl1_info_t *info;
 395         struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 396         struct sk_buff *s;
 397         nsh_t nsh;
 398
 399         if (!hdev) {
 400                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 401                 return -ENODEV;
 402         }
 403
 404         info = (dtl1_info_t *)(hdev->driver_data);
 405
 406         switch (bt_cb(skb)->pkt_type) {
 407         case HCI_COMMAND_PKT:
 408                 hdev->stat.cmd_tx++;
 409                 nsh.type = 0x81;
 410                 break;
 411         case HCI_ACLDATA_PKT:
 412                 hdev->stat.acl_tx++;
 413                 nsh.type = 0x82;
 414                 break;
 415         case HCI_SCODATA_PKT:
 416                 hdev->stat.sco_tx++;
 417                 nsh.type = 0x83;
 418                 break;
 419         default:
 420                 return -EILSEQ;
 421         };
 422
 423         nsh.zero = 0;
 424         nsh.len = skb->len;
 425
 426         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 427         if (!s)
 428                 return -ENOMEM;
 429
 430         skb_reserve(s, NSHL);
 431         skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 432         if (skb->len & 0x0001)
 433                 *skb_put(s, 1) = 0;     /* PAD */
 434
 435         /* Prepend skb with Nokia frame header and queue */
 436         memcpy(skb_push(s, NSHL), &nsh, NSHL);
 437         skb_queue_tail(&(info->txq), s);
 438
 439         dtl1_write_wakeup(info);
 440
 441         kfree_skb(skb);
 442
 443         return 0;
 444 }
 445
 446
 447 static void dtl1_hci_destruct(struct hci_dev *hdev)
 448 {
 449 }
 450
 451
 452 static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
 453 {
 454         return -ENOIOCTLCMD;
 455 }
 456
 457
 458
 459 /* ======================== Card services HCI interaction ======================== */
 460
 461
 462 static int dtl1_open(dtl1_info_t *info)
 463 {
 464         unsigned long flags;
 465         unsigned int iobase = info->p_dev->io.BasePort1;
 466         struct hci_dev *hdev;
 467
 468         spin_lock_init(&(info->lock));
 469
 470         skb_queue_head_init(&(info->txq));
 471
 472         info->rx_state = RECV_WAIT_NSH;
 473         info->rx_count = NSHL;
 474         info->rx_skb = NULL;
 475
 476         set_bit(XMIT_WAITING, &(info->tx_state));
 477
 478         /* Initialize HCI device */
 479         hdev = hci_alloc_dev();
 480         if (!hdev) {
 481                 BT_ERR("Can't allocate HCI device");
 482                 return -ENOMEM;
 483         }
 484
 485         info->hdev = hdev;
 486
 487         hdev->bus = HCI_PCCARD;
 488         hdev->driver_data = info;
 489         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 490
 491         hdev->open     = dtl1_hci_open;
 492         hdev->close    = dtl1_hci_close;
 493         hdev->flush    = dtl1_hci_flush;
 494         hdev->send     = dtl1_hci_send_frame;
 495         hdev->destruct = dtl1_hci_destruct;
 496         hdev->ioctl    = dtl1_hci_ioctl;
 497
 498         hdev->owner = THIS_MODULE;
 499
 500         spin_lock_irqsave(&(info->lock), flags);
 501
 502         /* Reset UART */
 503         outb(0, iobase + UART_MCR);
 504
 505         /* Turn off interrupts */
 506         outb(0, iobase + UART_IER);
 507
 508         /* Initialize UART */
 509         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 510         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 511
 512         info->ri_latch = inb(info->p_dev->io.BasePort1 + UART_MSR) & UART_MSR_RI;
 513
 514         /* Turn on interrupts */
 515         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 516
 517         spin_unlock_irqrestore(&(info->lock), flags);
 518
 519         /* Timeout before it is safe to send the first HCI packet */
 520         msleep(2000);
 521
 522         /* Register HCI device */
 523         if (hci_register_dev(hdev) < 0) {
 524                 BT_ERR("Can't register HCI device");
 525                 info->hdev = NULL;
 526                 hci_free_dev(hdev);
 527                 return -ENODEV;
 528         }
 529
 530         return 0;
 531 }
 532
 533
 534 static int dtl1_close(dtl1_info_t *info)
 535 {
 536         unsigned long flags;
 537         unsigned int iobase = info->p_dev->io.BasePort1;
 538         struct hci_dev *hdev = info->hdev;
 539
 540         if (!hdev)
 541                 return -ENODEV;
 542
 543         dtl1_hci_close(hdev);
 544
 545         spin_lock_irqsave(&(info->lock), flags);
 546
 547         /* Reset UART */
 548         outb(0, iobase + UART_MCR);
 549
 550         /* Turn off interrupts */
 551         outb(0, iobase + UART_IER);
 552
 553         spin_unlock_irqrestore(&(info->lock), flags);
 554
 555         if (hci_unregister_dev(hdev) < 0)
 556                 BT_ERR("Can't unregister HCI device %s", hdev->name);
 557
 558         hci_free_dev(hdev);
 559
 560         return 0;
 561 }
 562
 563 static int dtl1_probe(struct pcmcia_device *link)
 564 {
 565         dtl1_info_t *info;
 566
 567         /* Create new info device */
 568         info = kzalloc(sizeof(*info), GFP_KERNEL);
 569         if (!info)
 570                 return -ENOMEM;
 571
 572         info->p_dev = link;
 573         link->priv = info;
 574
 575         link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 576         link->io.NumPorts1 = 8;
 577
 578         link->conf.Attributes = CONF_ENABLE_IRQ;
 579         link->conf.IntType = INT_MEMORY_AND_IO;
 580
 581         return dtl1_config(link);
 582 }
 583
 584
 585 static void dtl1_detach(struct pcmcia_device *link)
 586 {
 587         dtl1_info_t *info = link->priv;
 588
 589         dtl1_release(link);
 590
 591         kfree(info);
 592 }
 593
 594 static int dtl1_confcheck(struct pcmcia_device *p_dev,
 595                           cistpl_cftable_entry_t *cf,
 596                           cistpl_cftable_entry_t *dflt,
 597                           unsigned int vcc,
 598                           void *priv_data)
 599 {
 600         if ((cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
 601                 p_dev->io.BasePort1 = cf->io.win[0].base;
 602                 p_dev->io.NumPorts1 = cf->io.win[0].len;        /*yo */
 603                 p_dev->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
 604                 if (!pcmcia_request_io(p_dev, &p_dev->io))
 605                         return 0;
 606         }
 607         return -ENODEV;
 608 }
 609
 610 static int dtl1_config(struct pcmcia_device *link)
 611 {
 612         dtl1_info_t *info = link->priv;
 613         int i;
 614
 615         /* Look for a generic full-sized window */
 616         link->io.NumPorts1 = 8;
 617         if (pcmcia_loop_config(link, dtl1_confcheck, NULL) < 0)
 618                 goto failed;
 619
 620         i = pcmcia_request_irq(link, dtl1_interrupt);
 621         if (i != 0)
 622                 goto failed;
 623
 624         i = pcmcia_request_configuration(link, &link->conf);
 625         if (i != 0)
 626                 goto failed;
 627
 628         if (dtl1_open(info) != 0)
 629                 goto failed;
 630
 631         return 0;
 632
 633 failed:
 634         dtl1_release(link);
 635         return -ENODEV;
 636 }
 637
 638
 639 static void dtl1_release(struct pcmcia_device *link)
 640 {
 641         dtl1_info_t *info = link->priv;
 642
 643         dtl1_close(info);
 644
 645         pcmcia_disable_device(link);
 646 }
 647
 648
 649 static struct pcmcia_device_id dtl1_ids[] = {
 650         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 651         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 652         PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 653         PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 654         PCMCIA_DEVICE_NULL
 655 };
 656 MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 657
 658 static struct pcmcia_driver dtl1_driver = {
 659         .owner          = THIS_MODULE,
 660         .drv            = {
 661                 .name   = "dtl1_cs",
 662         },
 663         .probe          = dtl1_probe,
 664         .remove         = dtl1_detach,
 665         .id_table       = dtl1_ids,
 666 };
 667
 668 static int __init init_dtl1_cs(void)
 669 {
 670         return pcmcia_register_driver(&dtl1_driver);
 671 }
 672
 673
 674 static void __exit exit_dtl1_cs(void)
 675 {
 676         pcmcia_unregister_driver(&dtl1_driver);
 677 }
 678
 679 module_init(init_dtl1_cs);
 680 module_exit(exit_dtl1_cs);