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