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/io.h>
  42
  43 #include <pcmcia/cistpl.h>
  44 #include <pcmcia/ciscode.h>
  45 #include <pcmcia/ds.h>
  46 #include <pcmcia/cisreg.h>
  47
  48 #include <net/bluetooth/bluetooth.h>
  49 #include <net/bluetooth/hci_core.h>
  50
  51
  52
  53 /* ======================== Module parameters ======================== */
  54
  55
  56 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  57 MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
  58 MODULE_LICENSE("GPL");
  59
  60
  61
  62 /* ======================== Local structures ======================== */
  63
  64
  65 struct dtl1_info {
  66         struct pcmcia_device *p_dev;
  67
  68         struct hci_dev *hdev;
  69
  70         spinlock_t lock;                /* For serializing operations */
  71
  72         unsigned long flowmask;         /* HCI flow mask */
  73         int ri_latch;
  74
  75         struct sk_buff_head txq;
  76         unsigned long tx_state;
  77
  78         unsigned long rx_state;
  79         unsigned long rx_count;
  80         struct sk_buff *rx_skb;
  81 };
  82
  83
  84 static int dtl1_config(struct pcmcia_device *link);
  85
  86
  87 /* Transmit states  */
  88 #define XMIT_SENDING  1
  89 #define XMIT_WAKEUP   2
  90 #define XMIT_WAITING  8
  91
  92 /* Receiver States */
  93 #define RECV_WAIT_NSH   0
  94 #define RECV_WAIT_DATA  1
  95
  96
  97 struct nsh {
  98         u8 type;
  99         u8 zero;
 100         u16 len;
 101 } __packed;     /* Nokia Specific Header */
 102
 103 #define NSHL  4                         /* Nokia Specific Header Length */
 104
 105
 106
 107 /* ======================== Interrupt handling ======================== */
 108
 109
 110 static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 111 {
 112         int actual = 0;
 113
 114         /* Tx FIFO should be empty */
 115         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
 116                 return 0;
 117
 118         /* Fill FIFO with current frame */
 119         while ((fifo_size-- > 0) && (actual < len)) {
 120                 /* Transmit next byte */
 121                 outb(buf[actual], iobase + UART_TX);
 122                 actual++;
 123         }
 124
 125         return actual;
 126 }
 127
 128
 129 static void dtl1_write_wakeup(struct dtl1_info *info)
 130 {
 131         if (!info) {
 132                 BT_ERR("Unknown device");
 133                 return;
 134         }
 135
 136         if (test_bit(XMIT_WAITING, &(info->tx_state))) {
 137                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 138                 return;
 139         }
 140
 141         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
 142                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 143                 return;
 144         }
 145
 146         do {
 147                 unsigned int iobase = info->p_dev->resource[0]->start;
 148                 register struct sk_buff *skb;
 149                 int len;
 150
 151                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
 152
 153                 if (!pcmcia_dev_present(info->p_dev))
 154                         return;
 155
 156                 skb = skb_dequeue(&(info->txq));
 157                 if (!skb)
 158                         break;
 159
 160                 /* Send frame */
 161                 len = dtl1_write(iobase, 32, skb->data, skb->len);
 162
 163                 if (len == skb->len) {
 164                         set_bit(XMIT_WAITING, &(info->tx_state));
 165                         kfree_skb(skb);
 166                 } else {
 167                         skb_pull(skb, len);
 168                         skb_queue_head(&(info->txq), skb);
 169                 }
 170
 171                 info->hdev->stat.byte_tx += len;
 172
 173         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 174
 175         clear_bit(XMIT_SENDING, &(info->tx_state));
 176 }
 177
 178
 179 static void dtl1_control(struct dtl1_info *info, struct sk_buff *skb)
 180 {
 181         u8 flowmask = *(u8 *)skb->data;
 182         int i;
 183
 184         printk(KERN_INFO "Bluetooth: Nokia control data =");
 185         for (i = 0; i < skb->len; i++)
 186                 printk(" %02x", skb->data[i]);
 187
 188         printk("\n");
 189
 190         /* transition to active state */
 191         if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
 192                 clear_bit(XMIT_WAITING, &(info->tx_state));
 193                 dtl1_write_wakeup(info);
 194         }
 195
 196         info->flowmask = flowmask;
 197
 198         kfree_skb(skb);
 199 }
 200
 201
 202 static void dtl1_receive(struct dtl1_info *info)
 203 {
 204         unsigned int iobase;
 205         struct nsh *nsh;
 206         int boguscount = 0;
 207
 208         if (!info) {
 209                 BT_ERR("Unknown device");
 210                 return;
 211         }
 212
 213         iobase = info->p_dev->resource[0]->start;
 214
 215         do {
 216                 info->hdev->stat.byte_rx++;
 217
 218                 /* Allocate packet */
 219                 if (info->rx_skb == NULL) {
 220                         info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
 221                         if (!info->rx_skb) {
 222                                 BT_ERR("Can't allocate mem for new packet");
 223                                 info->rx_state = RECV_WAIT_NSH;
 224                                 info->rx_count = NSHL;
 225                                 return;
 226                         }
 227                 }
 228
 229                 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 230                 nsh = (struct nsh *)info->rx_skb->data;
 231
 232                 info->rx_count--;
 233
 234                 if (info->rx_count == 0) {
 235
 236                         switch (info->rx_state) {
 237                         case RECV_WAIT_NSH:
 238                                 info->rx_state = RECV_WAIT_DATA;
 239                                 info->rx_count = nsh->len + (nsh->len & 0x0001);
 240                                 break;
 241                         case RECV_WAIT_DATA:
 242                                 bt_cb(info->rx_skb)->pkt_type = nsh->type;
 243
 244                                 /* remove PAD byte if it exists */
 245                                 if (nsh->len & 0x0001) {
 246                                         info->rx_skb->tail--;
 247                                         info->rx_skb->len--;
 248                                 }
 249
 250                                 /* remove NSH */
 251                                 skb_pull(info->rx_skb, NSHL);
 252
 253                                 switch (bt_cb(info->rx_skb)->pkt_type) {
 254                                 case 0x80:
 255                                         /* control data for the Nokia Card */
 256                                         dtl1_control(info, info->rx_skb);
 257                                         break;
 258                                 case 0x82:
 259                                 case 0x83:
 260                                 case 0x84:
 261                                         /* send frame to the HCI layer */
 262                                         bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 263                                         hci_recv_frame(info->hdev, info->rx_skb);
 264                                         break;
 265                                 default:
 266                                         /* unknown packet */
 267                                         BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 268                                         kfree_skb(info->rx_skb);
 269                                         break;
 270                                 }
 271
 272                                 info->rx_state = RECV_WAIT_NSH;
 273                                 info->rx_count = NSHL;
 274                                 info->rx_skb = NULL;
 275                                 break;
 276                         }
 277
 278                 }
 279
 280                 /* Make sure we don't stay here too long */
 281                 if (boguscount++ > 32)
 282                         break;
 283
 284         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 285 }
 286
 287
 288 static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 289 {
 290         struct dtl1_info *info = dev_inst;
 291         unsigned int iobase;
 292         unsigned char msr;
 293         int boguscount = 0;
 294         int iir, lsr;
 295         irqreturn_t r = IRQ_NONE;
 296
 297         if (!info || !info->hdev)
 298                 /* our irq handler is shared */
 299                 return IRQ_NONE;
 300
 301         iobase = info->p_dev->resource[0]->start;
 302
 303         spin_lock(&(info->lock));
 304
 305         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 306         while (iir) {
 307
 308                 r = IRQ_HANDLED;
 309                 /* Clear interrupt */
 310                 lsr = inb(iobase + UART_LSR);
 311
 312                 switch (iir) {
 313                 case UART_IIR_RLSI:
 314                         BT_ERR("RLSI");
 315                         break;
 316                 case UART_IIR_RDI:
 317                         /* Receive interrupt */
 318                         dtl1_receive(info);
 319                         break;
 320                 case UART_IIR_THRI:
 321                         if (lsr & UART_LSR_THRE) {
 322                                 /* Transmitter ready for data */
 323                                 dtl1_write_wakeup(info);
 324                         }
 325                         break;
 326                 default:
 327                         BT_ERR("Unhandled IIR=%#x", iir);
 328                         break;
 329                 }
 330
 331                 /* Make sure we don't stay here too long */
 332                 if (boguscount++ > 100)
 333                         break;
 334
 335                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 336
 337         }
 338
 339         msr = inb(iobase + UART_MSR);
 340
 341         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 342                 info->ri_latch = msr & UART_MSR_RI;
 343                 clear_bit(XMIT_WAITING, &(info->tx_state));
 344                 dtl1_write_wakeup(info);
 345                 r = IRQ_HANDLED;
 346         }
 347
 348         spin_unlock(&(info->lock));
 349
 350         return r;
 351 }
 352
 353
 354
 355 /* ======================== HCI interface ======================== */
 356
 357
 358 static int dtl1_hci_open(struct hci_dev *hdev)
 359 {
 360         set_bit(HCI_RUNNING, &(hdev->flags));
 361
 362         return 0;
 363 }
 364
 365
 366 static int dtl1_hci_flush(struct hci_dev *hdev)
 367 {
 368         struct dtl1_info *info = hci_get_drvdata(hdev);
 369
 370         /* Drop TX queue */
 371         skb_queue_purge(&(info->txq));
 372
 373         return 0;
 374 }
 375
 376
 377 static int dtl1_hci_close(struct hci_dev *hdev)
 378 {
 379         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 380                 return 0;
 381
 382         dtl1_hci_flush(hdev);
 383
 384         return 0;
 385 }
 386
 387
 388 static int dtl1_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 389 {
 390         struct dtl1_info *info = hci_get_drvdata(hdev);
 391         struct sk_buff *s;
 392         struct nsh nsh;
 393
 394         switch (bt_cb(skb)->pkt_type) {
 395         case HCI_COMMAND_PKT:
 396                 hdev->stat.cmd_tx++;
 397                 nsh.type = 0x81;
 398                 break;
 399         case HCI_ACLDATA_PKT:
 400                 hdev->stat.acl_tx++;
 401                 nsh.type = 0x82;
 402                 break;
 403         case HCI_SCODATA_PKT:
 404                 hdev->stat.sco_tx++;
 405                 nsh.type = 0x83;
 406                 break;
 407         default:
 408                 return -EILSEQ;
 409         }
 410
 411         nsh.zero = 0;
 412         nsh.len = skb->len;
 413
 414         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 415         if (!s)
 416                 return -ENOMEM;
 417
 418         skb_reserve(s, NSHL);
 419         skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 420         if (skb->len & 0x0001)
 421                 *skb_put(s, 1) = 0;     /* PAD */
 422
 423         /* Prepend skb with Nokia frame header and queue */
 424         memcpy(skb_push(s, NSHL), &nsh, NSHL);
 425         skb_queue_tail(&(info->txq), s);
 426
 427         dtl1_write_wakeup(info);
 428
 429         kfree_skb(skb);
 430
 431         return 0;
 432 }
 433
 434
 435
 436 /* ======================== Card services HCI interaction ======================== */
 437
 438
 439 static int dtl1_open(struct dtl1_info *info)
 440 {
 441         unsigned long flags;
 442         unsigned int iobase = info->p_dev->resource[0]->start;
 443         struct hci_dev *hdev;
 444
 445         spin_lock_init(&(info->lock));
 446
 447         skb_queue_head_init(&(info->txq));
 448
 449         info->rx_state = RECV_WAIT_NSH;
 450         info->rx_count = NSHL;
 451         info->rx_skb = NULL;
 452
 453         set_bit(XMIT_WAITING, &(info->tx_state));
 454
 455         /* Initialize HCI device */
 456         hdev = hci_alloc_dev();
 457         if (!hdev) {
 458                 BT_ERR("Can't allocate HCI device");
 459                 return -ENOMEM;
 460         }
 461
 462         info->hdev = hdev;
 463
 464         hdev->bus = HCI_PCCARD;
 465         hci_set_drvdata(hdev, info);
 466         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 467
 468         hdev->open  = dtl1_hci_open;
 469         hdev->close = dtl1_hci_close;
 470         hdev->flush = dtl1_hci_flush;
 471         hdev->send  = dtl1_hci_send_frame;
 472
 473         spin_lock_irqsave(&(info->lock), flags);
 474
 475         /* Reset UART */
 476         outb(0, iobase + UART_MCR);
 477
 478         /* Turn off interrupts */
 479         outb(0, iobase + UART_IER);
 480
 481         /* Initialize UART */
 482         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 483         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 484
 485         info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
 486                                 & UART_MSR_RI;
 487
 488         /* Turn on interrupts */
 489         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 490
 491         spin_unlock_irqrestore(&(info->lock), flags);
 492
 493         /* Timeout before it is safe to send the first HCI packet */
 494         msleep(2000);
 495
 496         /* Register HCI device */
 497         if (hci_register_dev(hdev) < 0) {
 498                 BT_ERR("Can't register HCI device");
 499                 info->hdev = NULL;
 500                 hci_free_dev(hdev);
 501                 return -ENODEV;
 502         }
 503
 504         return 0;
 505 }
 506
 507
 508 static int dtl1_close(struct dtl1_info *info)
 509 {
 510         unsigned long flags;
 511         unsigned int iobase = info->p_dev->resource[0]->start;
 512         struct hci_dev *hdev = info->hdev;
 513
 514         if (!hdev)
 515                 return -ENODEV;
 516
 517         dtl1_hci_close(hdev);
 518
 519         spin_lock_irqsave(&(info->lock), flags);
 520
 521         /* Reset UART */
 522         outb(0, iobase + UART_MCR);
 523
 524         /* Turn off interrupts */
 525         outb(0, iobase + UART_IER);
 526
 527         spin_unlock_irqrestore(&(info->lock), flags);
 528
 529         hci_unregister_dev(hdev);
 530         hci_free_dev(hdev);
 531
 532         return 0;
 533 }
 534
 535 static int dtl1_probe(struct pcmcia_device *link)
 536 {
 537         struct dtl1_info *info;
 538
 539         /* Create new info device */
 540         info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 541         if (!info)
 542                 return -ENOMEM;
 543
 544         info->p_dev = link;
 545         link->priv = info;
 546
 547         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 548
 549         return dtl1_config(link);
 550 }
 551
 552
 553 static void dtl1_detach(struct pcmcia_device *link)
 554 {
 555         struct dtl1_info *info = link->priv;
 556
 557         dtl1_close(info);
 558         pcmcia_disable_device(link);
 559 }
 560
 561 static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
 562 {
 563         if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
 564                 return -ENODEV;
 565
 566         p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 567         p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 568
 569         return pcmcia_request_io(p_dev);
 570 }
 571
 572 static int dtl1_config(struct pcmcia_device *link)
 573 {
 574         struct dtl1_info *info = link->priv;
 575         int ret;
 576
 577         /* Look for a generic full-sized window */
 578         link->resource[0]->end = 8;
 579         ret = pcmcia_loop_config(link, dtl1_confcheck, NULL);
 580         if (ret)
 581                 goto failed;
 582
 583         ret = pcmcia_request_irq(link, dtl1_interrupt);
 584         if (ret)
 585                 goto failed;
 586
 587         ret = pcmcia_enable_device(link);
 588         if (ret)
 589                 goto failed;
 590
 591         ret = dtl1_open(info);
 592         if (ret)
 593                 goto failed;
 594
 595         return 0;
 596
 597 failed:
 598         dtl1_detach(link);
 599         return ret;
 600 }
 601
 602 static const struct pcmcia_device_id dtl1_ids[] = {
 603         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 604         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 605         PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 606         PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 607         PCMCIA_DEVICE_NULL
 608 };
 609 MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 610
 611 static struct pcmcia_driver dtl1_driver = {
 612         .owner          = THIS_MODULE,
 613         .name           = "dtl1_cs",
 614         .probe          = dtl1_probe,
 615         .remove         = dtl1_detach,
 616         .id_table       = dtl1_ids,
 617 };
 618 module_pcmcia_driver(dtl1_driver);