drivers/bluetooth/btuart_cs.c

   1 /*
   2  *
   3  *  Driver for Bluetooth PCMCIA cards with HCI UART interface
   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/config.h>
  24 #include <linux/module.h>
  25
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/types.h>
  30 #include <linux/sched.h>
  31 #include <linux/delay.h>
  32 #include <linux/errno.h>
  33 #include <linux/ptrace.h>
  34 #include <linux/ioport.h>
  35 #include <linux/spinlock.h>
  36
  37 #include <linux/skbuff.h>
  38 #include <linux/string.h>
  39 #include <linux/serial.h>
  40 #include <linux/serial_reg.h>
  41 #include <asm/system.h>
  42 #include <asm/bitops.h>
  43 #include <asm/io.h>
  44
  45 #include <pcmcia/version.h>
  46 #include <pcmcia/cs_types.h>
  47 #include <pcmcia/cs.h>
  48 #include <pcmcia/cistpl.h>
  49 #include <pcmcia/ciscode.h>
  50 #include <pcmcia/ds.h>
  51 #include <pcmcia/cisreg.h>
  52
  53 #include <net/bluetooth/bluetooth.h>
  54 #include <net/bluetooth/hci_core.h>
  55
  56
  57
  58 /* ======================== Module parameters ======================== */
  59
  60
  61 /* Bit map of interrupts to choose from */
  62 static u_int irq_mask = 0xffff;
  63 static int irq_list[4] = { -1 };
  64
  65 MODULE_PARM(irq_mask, "i");
  66 MODULE_PARM(irq_list, "1-4i");
  67
  68 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  69 MODULE_DESCRIPTION("Bluetooth driver for Bluetooth PCMCIA cards with HCI UART interface");
  70 MODULE_LICENSE("GPL");
  71
  72
  73
  74 /* ======================== Local structures ======================== */
  75
  76
  77 typedef struct btuart_info_t {
  78         dev_link_t link;
  79         dev_node_t node;
  80
  81         struct hci_dev *hdev;
  82
  83         spinlock_t lock;        /* For serializing operations */
  84
  85         struct sk_buff_head txq;
  86         unsigned long tx_state;
  87
  88         unsigned long rx_state;
  89         unsigned long rx_count;
  90         struct sk_buff *rx_skb;
  91 } btuart_info_t;
  92
  93
  94 void btuart_config(dev_link_t *link);
  95 void btuart_release(dev_link_t *link);
  96 int btuart_event(event_t event, int priority, event_callback_args_t *args);
  97
  98 static dev_info_t dev_info = "btuart_cs";
  99
 100 dev_link_t *btuart_attach(void);
 101 void btuart_detach(dev_link_t *);
 102
 103 static dev_link_t *dev_list = NULL;
 104
 105
 106 /* Maximum baud rate */
 107 #define SPEED_MAX  115200
 108
 109 /* Default baud rate: 57600, 115200, 230400 or 460800 */
 110 #define DEFAULT_BAUD_RATE  115200
 111
 112
 113 /* Transmit states  */
 114 #define XMIT_SENDING    1
 115 #define XMIT_WAKEUP     2
 116 #define XMIT_WAITING    8
 117
 118 /* Receiver states */
 119 #define RECV_WAIT_PACKET_TYPE   0
 120 #define RECV_WAIT_EVENT_HEADER  1
 121 #define RECV_WAIT_ACL_HEADER    2
 122 #define RECV_WAIT_SCO_HEADER    3
 123 #define RECV_WAIT_DATA          4
 124
 125
 126
 127 /* ======================== Interrupt handling ======================== */
 128
 129
 130 static int btuart_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 131 {
 132         int actual = 0;
 133
 134         /* Tx FIFO should be empty */
 135         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
 136                 return 0;
 137
 138         /* Fill FIFO with current frame */
 139         while ((fifo_size-- > 0) && (actual < len)) {
 140                 /* Transmit next byte */
 141                 outb(buf[actual], iobase + UART_TX);
 142                 actual++;
 143         }
 144
 145         return actual;
 146 }
 147
 148
 149 static void btuart_write_wakeup(btuart_info_t *info)
 150 {
 151         if (!info) {
 152                 BT_ERR("Unknown device");
 153                 return;
 154         }
 155
 156         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
 157                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 158                 return;
 159         }
 160
 161         do {
 162                 register unsigned int iobase = info->link.io.BasePort1;
 163                 register struct sk_buff *skb;
 164                 register int len;
 165
 166                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
 167
 168                 if (!(info->link.state & DEV_PRESENT))
 169                         return;
 170
 171                 if (!(skb = skb_dequeue(&(info->txq))))
 172                         break;
 173
 174                 /* Send frame */
 175                 len = btuart_write(iobase, 16, skb->data, skb->len);
 176                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 177
 178                 if (len == skb->len) {
 179                         kfree_skb(skb);
 180                 } else {
 181                         skb_pull(skb, len);
 182                         skb_queue_head(&(info->txq), skb);
 183                 }
 184
 185                 info->hdev->stat.byte_tx += len;
 186
 187         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 188
 189         clear_bit(XMIT_SENDING, &(info->tx_state));
 190 }
 191
 192
 193 static void btuart_receive(btuart_info_t *info)
 194 {
 195         unsigned int iobase;
 196         int boguscount = 0;
 197
 198         if (!info) {
 199                 BT_ERR("Unknown device");
 200                 return;
 201         }
 202
 203         iobase = info->link.io.BasePort1;
 204
 205         do {
 206                 info->hdev->stat.byte_rx++;
 207
 208                 /* Allocate packet */
 209                 if (info->rx_skb == NULL) {
 210                         info->rx_state = RECV_WAIT_PACKET_TYPE;
 211                         info->rx_count = 0;
 212                         if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
 213                                 BT_ERR("Can't allocate mem for new packet");
 214                                 return;
 215                         }
 216                 }
 217
 218                 if (info->rx_state == RECV_WAIT_PACKET_TYPE) {
 219
 220                         info->rx_skb->dev = (void *) info->hdev;
 221                         info->rx_skb->pkt_type = inb(iobase + UART_RX);
 222
 223                         switch (info->rx_skb->pkt_type) {
 224
 225                         case HCI_EVENT_PKT:
 226                                 info->rx_state = RECV_WAIT_EVENT_HEADER;
 227                                 info->rx_count = HCI_EVENT_HDR_SIZE;
 228                                 break;
 229
 230                         case HCI_ACLDATA_PKT:
 231                                 info->rx_state = RECV_WAIT_ACL_HEADER;
 232                                 info->rx_count = HCI_ACL_HDR_SIZE;
 233                                 break;
 234
 235                         case HCI_SCODATA_PKT:
 236                                 info->rx_state = RECV_WAIT_SCO_HEADER;
 237                                 info->rx_count = HCI_SCO_HDR_SIZE;
 238                                 break;
 239
 240                         default:
 241                                 /* Unknown packet */
 242                                 BT_ERR("Unknown HCI packet with type 0x%02x received", info->rx_skb->pkt_type);
 243                                 info->hdev->stat.err_rx++;
 244                                 clear_bit(HCI_RUNNING, &(info->hdev->flags));
 245
 246                                 kfree_skb(info->rx_skb);
 247                                 info->rx_skb = NULL;
 248                                 break;
 249
 250                         }
 251
 252                 } else {
 253
 254                         *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 255                         info->rx_count--;
 256
 257                         if (info->rx_count == 0) {
 258
 259                                 int dlen;
 260                                 struct hci_event_hdr *eh;
 261                                 struct hci_acl_hdr *ah;
 262                                 struct hci_sco_hdr *sh;
 263
 264
 265                                 switch (info->rx_state) {
 266
 267                                 case RECV_WAIT_EVENT_HEADER:
 268                                         eh = (struct hci_event_hdr *)(info->rx_skb->data);
 269                                         info->rx_state = RECV_WAIT_DATA;
 270                                         info->rx_count = eh->plen;
 271                                         break;
 272
 273                                 case RECV_WAIT_ACL_HEADER:
 274                                         ah = (struct hci_acl_hdr *)(info->rx_skb->data);
 275                                         dlen = __le16_to_cpu(ah->dlen);
 276                                         info->rx_state = RECV_WAIT_DATA;
 277                                         info->rx_count = dlen;
 278                                         break;
 279
 280                                 case RECV_WAIT_SCO_HEADER:
 281                                         sh = (struct hci_sco_hdr *)(info->rx_skb->data);
 282                                         info->rx_state = RECV_WAIT_DATA;
 283                                         info->rx_count = sh->dlen;
 284                                         break;
 285
 286                                 case RECV_WAIT_DATA:
 287                                         hci_recv_frame(info->rx_skb);
 288                                         info->rx_skb = NULL;
 289                                         break;
 290
 291                                 }
 292
 293                         }
 294
 295                 }
 296
 297                 /* Make sure we don't stay here too long */
 298                 if (boguscount++ > 16)
 299                         break;
 300
 301         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 302 }
 303
 304
 305 static irqreturn_t btuart_interrupt(int irq, void *dev_inst, struct pt_regs *regs)
 306 {
 307         btuart_info_t *info = dev_inst;
 308         unsigned int iobase;
 309         int boguscount = 0;
 310         int iir, lsr;
 311
 312         if (!info || !info->hdev) {
 313                 BT_ERR("Call of irq %d for unknown device", irq);
 314                 return IRQ_NONE;
 315         }
 316
 317         iobase = info->link.io.BasePort1;
 318
 319         spin_lock(&(info->lock));
 320
 321         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 322         while (iir) {
 323
 324                 /* Clear interrupt */
 325                 lsr = inb(iobase + UART_LSR);
 326
 327                 switch (iir) {
 328                 case UART_IIR_RLSI:
 329                         BT_ERR("RLSI");
 330                         break;
 331                 case UART_IIR_RDI:
 332                         /* Receive interrupt */
 333                         btuart_receive(info);
 334                         break;
 335                 case UART_IIR_THRI:
 336                         if (lsr & UART_LSR_THRE) {
 337                                 /* Transmitter ready for data */
 338                                 btuart_write_wakeup(info);
 339                         }
 340                         break;
 341                 default:
 342                         BT_ERR("Unhandled IIR=%#x", iir);
 343                         break;
 344                 }
 345
 346                 /* Make sure we don't stay here too long */
 347                 if (boguscount++ > 100)
 348                         break;
 349
 350                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 351
 352         }
 353
 354         spin_unlock(&(info->lock));
 355
 356         return IRQ_HANDLED;
 357 }
 358
 359
 360 static void btuart_change_speed(btuart_info_t *info, unsigned int speed)
 361 {
 362         unsigned long flags;
 363         unsigned int iobase;
 364         int fcr;                /* FIFO control reg */
 365         int lcr;                /* Line control reg */
 366         int divisor;
 367
 368         if (!info) {
 369                 BT_ERR("Unknown device");
 370                 return;
 371         }
 372
 373         iobase = info->link.io.BasePort1;
 374
 375         spin_lock_irqsave(&(info->lock), flags);
 376
 377         /* Turn off interrupts */
 378         outb(0, iobase + UART_IER);
 379
 380         divisor = SPEED_MAX / speed;
 381
 382         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
 383
 384         /*
 385          * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
 386          * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
 387          * about this timeout since it will always be fast enough.
 388          */
 389
 390         if (speed < 38400)
 391                 fcr |= UART_FCR_TRIGGER_1;
 392         else
 393                 fcr |= UART_FCR_TRIGGER_14;
 394
 395         /* Bluetooth cards use 8N1 */
 396         lcr = UART_LCR_WLEN8;
 397
 398         outb(UART_LCR_DLAB | lcr, iobase + UART_LCR);   /* Set DLAB */
 399         outb(divisor & 0xff, iobase + UART_DLL);        /* Set speed */
 400         outb(divisor >> 8, iobase + UART_DLM);
 401         outb(lcr, iobase + UART_LCR);   /* Set 8N1  */
 402         outb(fcr, iobase + UART_FCR);   /* Enable FIFO's */
 403
 404         /* Turn on interrups */
 405         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 406
 407         spin_unlock_irqrestore(&(info->lock), flags);
 408 }
 409
 410
 411
 412 /* ======================== HCI interface ======================== */
 413
 414
 415 static int btuart_hci_flush(struct hci_dev *hdev)
 416 {
 417         btuart_info_t *info = (btuart_info_t *)(hdev->driver_data);
 418
 419         /* Drop TX queue */
 420         skb_queue_purge(&(info->txq));
 421
 422         return 0;
 423 }
 424
 425
 426 static int btuart_hci_open(struct hci_dev *hdev)
 427 {
 428         set_bit(HCI_RUNNING, &(hdev->flags));
 429
 430         return 0;
 431 }
 432
 433
 434 static int btuart_hci_close(struct hci_dev *hdev)
 435 {
 436         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 437                 return 0;
 438
 439         btuart_hci_flush(hdev);
 440
 441         return 0;
 442 }
 443
 444
 445 static int btuart_hci_send_frame(struct sk_buff *skb)
 446 {
 447         btuart_info_t *info;
 448         struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 449
 450         if (!hdev) {
 451                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 452                 return -ENODEV;
 453         }
 454
 455         info = (btuart_info_t *)(hdev->driver_data);
 456
 457         switch (skb->pkt_type) {
 458         case HCI_COMMAND_PKT:
 459                 hdev->stat.cmd_tx++;
 460                 break;
 461         case HCI_ACLDATA_PKT:
 462                 hdev->stat.acl_tx++;
 463                 break;
 464         case HCI_SCODATA_PKT:
 465                 hdev->stat.sco_tx++;
 466                 break;
 467         };
 468
 469         /* Prepend skb with frame type */
 470         memcpy(skb_push(skb, 1), &(skb->pkt_type), 1);
 471         skb_queue_tail(&(info->txq), skb);
 472
 473         btuart_write_wakeup(info);
 474
 475         return 0;
 476 }
 477
 478
 479 static void btuart_hci_destruct(struct hci_dev *hdev)
 480 {
 481 }
 482
 483
 484 static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
 485 {
 486         return -ENOIOCTLCMD;
 487 }
 488
 489
 490
 491 /* ======================== Card services HCI interaction ======================== */
 492
 493
 494 int btuart_open(btuart_info_t *info)
 495 {
 496         unsigned long flags;
 497         unsigned int iobase = info->link.io.BasePort1;
 498         struct hci_dev *hdev;
 499
 500         spin_lock_init(&(info->lock));
 501
 502         skb_queue_head_init(&(info->txq));
 503
 504         info->rx_state = RECV_WAIT_PACKET_TYPE;
 505         info->rx_count = 0;
 506         info->rx_skb = NULL;
 507
 508         /* Initialize HCI device */
 509         hdev = hci_alloc_dev();
 510         if (!hdev) {
 511                 BT_ERR("Can't allocate HCI device");
 512                 return -ENOMEM;
 513         }
 514
 515         info->hdev = hdev;
 516
 517         hdev->type = HCI_PCCARD;
 518         hdev->driver_data = info;
 519
 520         hdev->open     = btuart_hci_open;
 521         hdev->close    = btuart_hci_close;
 522         hdev->flush    = btuart_hci_flush;
 523         hdev->send     = btuart_hci_send_frame;
 524         hdev->destruct = btuart_hci_destruct;
 525         hdev->ioctl    = btuart_hci_ioctl;
 526
 527         hdev->owner = THIS_MODULE;
 528
 529         spin_lock_irqsave(&(info->lock), flags);
 530
 531         /* Reset UART */
 532         outb(0, iobase + UART_MCR);
 533
 534         /* Turn off interrupts */
 535         outb(0, iobase + UART_IER);
 536
 537         /* Initialize UART */
 538         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 539         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 540
 541         /* Turn on interrupts */
 542         // outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 543
 544         spin_unlock_irqrestore(&(info->lock), flags);
 545
 546         btuart_change_speed(info, DEFAULT_BAUD_RATE);
 547
 548         /* Timeout before it is safe to send the first HCI packet */
 549         msleep(1000);
 550
 551         /* Register HCI device */
 552         if (hci_register_dev(hdev) < 0) {
 553                 BT_ERR("Can't register HCI device");
 554                 info->hdev = NULL;
 555                 hci_free_dev(hdev);
 556                 return -ENODEV;
 557         }
 558
 559         return 0;
 560 }
 561
 562
 563 int btuart_close(btuart_info_t *info)
 564 {
 565         unsigned long flags;
 566         unsigned int iobase = info->link.io.BasePort1;
 567         struct hci_dev *hdev = info->hdev;
 568
 569         if (!hdev)
 570                 return -ENODEV;
 571
 572         btuart_hci_close(hdev);
 573
 574         spin_lock_irqsave(&(info->lock), flags);
 575
 576         /* Reset UART */
 577         outb(0, iobase + UART_MCR);
 578
 579         /* Turn off interrupts */
 580         outb(0, iobase + UART_IER);
 581
 582         spin_unlock_irqrestore(&(info->lock), flags);
 583
 584         if (hci_unregister_dev(hdev) < 0)
 585                 BT_ERR("Can't unregister HCI device %s", hdev->name);
 586
 587         hci_free_dev(hdev);
 588
 589         return 0;
 590 }
 591
 592 dev_link_t *btuart_attach(void)
 593 {
 594         btuart_info_t *info;
 595         client_reg_t client_reg;
 596         dev_link_t *link;
 597         int i, ret;
 598
 599         /* Create new info device */
 600         info = kmalloc(sizeof(*info), GFP_KERNEL);
 601         if (!info)
 602                 return NULL;
 603         memset(info, 0, sizeof(*info));
 604
 605         link = &info->link;
 606         link->priv = info;
 607
 608         link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 609         link->io.NumPorts1 = 8;
 610         link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
 611         link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;
 612
 613         if (irq_list[0] == -1)
 614                 link->irq.IRQInfo2 = irq_mask;
 615         else
 616                 for (i = 0; i < 4; i++)
 617                         link->irq.IRQInfo2 |= 1 << irq_list[i];
 618
 619         link->irq.Handler = btuart_interrupt;
 620         link->irq.Instance = info;
 621
 622         link->conf.Attributes = CONF_ENABLE_IRQ;
 623         link->conf.Vcc = 50;
 624         link->conf.IntType = INT_MEMORY_AND_IO;
 625
 626         /* Register with Card Services */
 627         link->next = dev_list;
 628         dev_list = link;
 629         client_reg.dev_info = &dev_info;
 630         client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
 631         client_reg.EventMask =
 632                 CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
 633                 CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
 634                 CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
 635         client_reg.event_handler = &btuart_event;
 636         client_reg.Version = 0x0210;
 637         client_reg.event_callback_args.client_data = link;
 638
 639         ret = pcmcia_register_client(&link->handle, &client_reg);
 640         if (ret != CS_SUCCESS) {
 641                 cs_error(link->handle, RegisterClient, ret);
 642                 btuart_detach(link);
 643                 return NULL;
 644         }
 645
 646         return link;
 647 }
 648
 649
 650 void btuart_detach(dev_link_t *link)
 651 {
 652         btuart_info_t *info = link->priv;
 653         dev_link_t **linkp;
 654         int ret;
 655
 656         /* Locate device structure */
 657         for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
 658                 if (*linkp == link)
 659                         break;
 660
 661         if (*linkp == NULL)
 662                 return;
 663
 664         if (link->state & DEV_CONFIG)
 665                 btuart_release(link);
 666
 667         if (link->handle) {
 668                 ret = pcmcia_deregister_client(link->handle);
 669                 if (ret != CS_SUCCESS)
 670                         cs_error(link->handle, DeregisterClient, ret);
 671         }
 672
 673         /* Unlink device structure, free bits */
 674         *linkp = link->next;
 675
 676         kfree(info);
 677 }
 678
 679 static int get_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
 680 {
 681         int i;
 682
 683         i = pcmcia_get_tuple_data(handle, tuple);
 684         if (i != CS_SUCCESS)
 685                 return i;
 686
 687         return pcmcia_parse_tuple(handle, tuple, parse);
 688 }
 689
 690 static int first_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
 691 {
 692         if (pcmcia_get_first_tuple(handle, tuple) != CS_SUCCESS)
 693                 return CS_NO_MORE_ITEMS;
 694         return get_tuple(handle, tuple, parse);
 695 }
 696
 697 static int next_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
 698 {
 699         if (pcmcia_get_next_tuple(handle, tuple) != CS_SUCCESS)
 700                 return CS_NO_MORE_ITEMS;
 701         return get_tuple(handle, tuple, parse);
 702 }
 703
 704 void btuart_config(dev_link_t *link)
 705 {
 706         static ioaddr_t base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
 707         client_handle_t handle = link->handle;
 708         btuart_info_t *info = link->priv;
 709         tuple_t tuple;
 710         u_short buf[256];
 711         cisparse_t parse;
 712         cistpl_cftable_entry_t *cf = &parse.cftable_entry;
 713         config_info_t config;
 714         int i, j, try, last_ret, last_fn;
 715
 716         tuple.TupleData = (cisdata_t *)buf;
 717         tuple.TupleOffset = 0;
 718         tuple.TupleDataMax = 255;
 719         tuple.Attributes = 0;
 720
 721         /* Get configuration register information */
 722         tuple.DesiredTuple = CISTPL_CONFIG;
 723         last_ret = first_tuple(handle, &tuple, &parse);
 724         if (last_ret != CS_SUCCESS) {
 725                 last_fn = ParseTuple;
 726                 goto cs_failed;
 727         }
 728         link->conf.ConfigBase = parse.config.base;
 729         link->conf.Present = parse.config.rmask[0];
 730
 731         /* Configure card */
 732         link->state |= DEV_CONFIG;
 733         i = pcmcia_get_configuration_info(handle, &config);
 734         link->conf.Vcc = config.Vcc;
 735
 736         /* First pass: look for a config entry that looks normal. */
 737         tuple.TupleData = (cisdata_t *) buf;
 738         tuple.TupleOffset = 0;
 739         tuple.TupleDataMax = 255;
 740         tuple.Attributes = 0;
 741         tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 742         /* Two tries: without IO aliases, then with aliases */
 743         for (try = 0; try < 2; try++) {
 744                 i = first_tuple(handle, &tuple, &parse);
 745                 while (i != CS_NO_MORE_ITEMS) {
 746                         if (i != CS_SUCCESS)
 747                                 goto next_entry;
 748                         if (cf->vpp1.present & (1 << CISTPL_POWER_VNOM))
 749                                 link->conf.Vpp1 = link->conf.Vpp2 = cf->vpp1.param[CISTPL_POWER_VNOM] / 10000;
 750                         if ((cf->io.nwin > 0) && (cf->io.win[0].len == 8) && (cf->io.win[0].base != 0)) {
 751                                 link->conf.ConfigIndex = cf->index;
 752                                 link->io.BasePort1 = cf->io.win[0].base;
 753                                 link->io.IOAddrLines = (try == 0) ? 16 : cf->io.flags & CISTPL_IO_LINES_MASK;
 754                                 i = pcmcia_request_io(link->handle, &link->io);
 755                                 if (i == CS_SUCCESS)
 756                                         goto found_port;
 757                         }
 758 next_entry:
 759                         i = next_tuple(handle, &tuple, &parse);
 760                 }
 761         }
 762
 763         /* Second pass: try to find an entry that isn't picky about
 764            its base address, then try to grab any standard serial port
 765            address, and finally try to get any free port. */
 766         i = first_tuple(handle, &tuple, &parse);
 767         while (i != CS_NO_MORE_ITEMS) {
 768                 if ((i == CS_SUCCESS) && (cf->io.nwin > 0)
 769                     && ((cf->io.flags & CISTPL_IO_LINES_MASK) <= 3)) {
 770                         link->conf.ConfigIndex = cf->index;
 771                         for (j = 0; j < 5; j++) {
 772                                 link->io.BasePort1 = base[j];
 773                                 link->io.IOAddrLines = base[j] ? 16 : 3;
 774                                 i = pcmcia_request_io(link->handle, &link->io);
 775                                 if (i == CS_SUCCESS)
 776                                         goto found_port;
 777                         }
 778                 }
 779                 i = next_tuple(handle, &tuple, &parse);
 780         }
 781
 782 found_port:
 783         if (i != CS_SUCCESS) {
 784                 BT_ERR("No usable port range found");
 785                 cs_error(link->handle, RequestIO, i);
 786                 goto failed;
 787         }
 788
 789         i = pcmcia_request_irq(link->handle, &link->irq);
 790         if (i != CS_SUCCESS) {
 791                 cs_error(link->handle, RequestIRQ, i);
 792                 link->irq.AssignedIRQ = 0;
 793         }
 794
 795         i = pcmcia_request_configuration(link->handle, &link->conf);
 796         if (i != CS_SUCCESS) {
 797                 cs_error(link->handle, RequestConfiguration, i);
 798                 goto failed;
 799         }
 800
 801         if (btuart_open(info) != 0)
 802                 goto failed;
 803
 804         strcpy(info->node.dev_name, info->hdev->name);
 805         link->dev = &info->node;
 806         link->state &= ~DEV_CONFIG_PENDING;
 807
 808         return;
 809
 810 cs_failed:
 811         cs_error(link->handle, last_fn, last_ret);
 812
 813 failed:
 814         btuart_release(link);
 815 }
 816
 817
 818 void btuart_release(dev_link_t *link)
 819 {
 820         btuart_info_t *info = link->priv;
 821
 822         if (link->state & DEV_PRESENT)
 823                 btuart_close(info);
 824
 825         link->dev = NULL;
 826
 827         pcmcia_release_configuration(link->handle);
 828         pcmcia_release_io(link->handle, &link->io);
 829         pcmcia_release_irq(link->handle, &link->irq);
 830
 831         link->state &= ~DEV_CONFIG;
 832 }
 833
 834
 835 int btuart_event(event_t event, int priority, event_callback_args_t *args)
 836 {
 837         dev_link_t *link = args->client_data;
 838         btuart_info_t *info = link->priv;
 839
 840         switch (event) {
 841         case CS_EVENT_CARD_REMOVAL:
 842                 link->state &= ~DEV_PRESENT;
 843                 if (link->state & DEV_CONFIG) {
 844                         btuart_close(info);
 845                         btuart_release(link);
 846                 }
 847                 break;
 848         case CS_EVENT_CARD_INSERTION:
 849                 link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
 850                 btuart_config(link);
 851                 break;
 852         case CS_EVENT_PM_SUSPEND:
 853                 link->state |= DEV_SUSPEND;
 854                 /* Fall through... */
 855         case CS_EVENT_RESET_PHYSICAL:
 856                 if (link->state & DEV_CONFIG)
 857                         pcmcia_release_configuration(link->handle);
 858                 break;
 859         case CS_EVENT_PM_RESUME:
 860                 link->state &= ~DEV_SUSPEND;
 861                 /* Fall through... */
 862         case CS_EVENT_CARD_RESET:
 863                 if (DEV_OK(link))
 864                         pcmcia_request_configuration(link->handle, &link->conf);
 865                 break;
 866         }
 867
 868         return 0;
 869 }
 870
 871 static struct pcmcia_driver btuart_driver = {
 872         .owner          = THIS_MODULE,
 873         .drv            = {
 874                 .name   = "btuart_cs",
 875         },
 876         .attach         = btuart_attach,
 877         .detach         = btuart_detach,
 878 };
 879
 880 static int __init init_btuart_cs(void)
 881 {
 882         return pcmcia_register_driver(&btuart_driver);
 883 }
 884
 885
 886 static void __exit exit_btuart_cs(void)
 887 {
 888         pcmcia_unregister_driver(&btuart_driver);
 889
 890         /* XXX: this really needs to move into generic code.. */
 891         while (dev_list != NULL)
 892                 btuart_detach(dev_list);
 893 }
 894
 895 module_init(init_btuart_cs);
 896 module_exit(exit_btuart_cs);