linux/drivers/bluetooth/dtl1_cs.c
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   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
  59MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  60MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
  61MODULE_LICENSE("GPL");
  62
  63
  64
  65/* ======================== Local structures ======================== */
  66
  67
  68typedef struct dtl1_info_t {
  69        struct pcmcia_device *p_dev;
  70        dev_node_t node;
  71
  72        struct hci_dev *hdev;
  73
  74        spinlock_t lock;                /* For serializing operations */
  75
  76        unsigned long flowmask;         /* HCI flow mask */
  77        int ri_latch;
  78
  79        struct sk_buff_head txq;
  80        unsigned long tx_state;
  81
  82        unsigned long rx_state;
  83        unsigned long rx_count;
  84        struct sk_buff *rx_skb;
  85} dtl1_info_t;
  86
  87
  88static int dtl1_config(struct pcmcia_device *link);
  89static void dtl1_release(struct pcmcia_device *link);
  90
  91static void dtl1_detach(struct pcmcia_device *p_dev);
  92
  93
  94/* Transmit states  */
  95#define XMIT_SENDING  1
  96#define XMIT_WAKEUP   2
  97#define XMIT_WAITING  8
  98
  99/* Receiver States */
 100#define RECV_WAIT_NSH   0
 101#define RECV_WAIT_DATA  1
 102
 103
 104typedef struct {
 105        u8 type;
 106        u8 zero;
 107        u16 len;
 108} __attribute__ ((packed)) nsh_t;       /* Nokia Specific Header */
 109
 110#define NSHL  4                         /* Nokia Specific Header Length */
 111
 112
 113
 114/* ======================== Interrupt handling ======================== */
 115
 116
 117static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 118{
 119        int actual = 0;
 120
 121        /* Tx FIFO should be empty */
 122        if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
 123                return 0;
 124
 125        /* Fill FIFO with current frame */
 126        while ((fifo_size-- > 0) && (actual < len)) {
 127                /* Transmit next byte */
 128                outb(buf[actual], iobase + UART_TX);
 129                actual++;
 130        }
 131
 132        return actual;
 133}
 134
 135
 136static void dtl1_write_wakeup(dtl1_info_t *info)
 137{
 138        if (!info) {
 139                BT_ERR("Unknown device");
 140                return;
 141        }
 142
 143        if (test_bit(XMIT_WAITING, &(info->tx_state))) {
 144                set_bit(XMIT_WAKEUP, &(info->tx_state));
 145                return;
 146        }
 147
 148        if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
 149                set_bit(XMIT_WAKEUP, &(info->tx_state));
 150                return;
 151        }
 152
 153        do {
 154                register unsigned int iobase = info->p_dev->io.BasePort1;
 155                register struct sk_buff *skb;
 156                register int len;
 157
 158                clear_bit(XMIT_WAKEUP, &(info->tx_state));
 159
 160                if (!pcmcia_dev_present(info->p_dev))
 161                        return;
 162
 163                if (!(skb = skb_dequeue(&(info->txq))))
 164                        break;
 165
 166                /* Send frame */
 167                len = dtl1_write(iobase, 32, skb->data, skb->len);
 168
 169                if (len == skb->len) {
 170                        set_bit(XMIT_WAITING, &(info->tx_state));
 171                        kfree_skb(skb);
 172                } else {
 173                        skb_pull(skb, len);
 174                        skb_queue_head(&(info->txq), skb);
 175                }
 176
 177                info->hdev->stat.byte_tx += len;
 178
 179        } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 180
 181        clear_bit(XMIT_SENDING, &(info->tx_state));
 182}
 183
 184
 185static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
 186{
 187        u8 flowmask = *(u8 *)skb->data;
 188        int i;
 189
 190        printk(KERN_INFO "Bluetooth: Nokia control data =");
 191        for (i = 0; i < skb->len; i++) {
 192                printk(" %02x", skb->data[i]);
 193        }
 194        printk("\n");
 195
 196        /* transition to active state */
 197        if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
 198                clear_bit(XMIT_WAITING, &(info->tx_state));
 199                dtl1_write_wakeup(info);
 200        }
 201
 202        info->flowmask = flowmask;
 203
 204        kfree_skb(skb);
 205}
 206
 207
 208static void dtl1_receive(dtl1_info_t *info)
 209{
 210        unsigned int iobase;
 211        nsh_t *nsh;
 212        int boguscount = 0;
 213
 214        if (!info) {
 215                BT_ERR("Unknown device");
 216                return;
 217        }
 218
 219        iobase = info->p_dev->io.BasePort1;
 220
 221        do {
 222                info->hdev->stat.byte_rx++;
 223
 224                /* Allocate packet */
 225                if (info->rx_skb == NULL)
 226                        if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
 227                                BT_ERR("Can't allocate mem for new packet");
 228                                info->rx_state = RECV_WAIT_NSH;
 229                                info->rx_count = NSHL;
 230                                return;
 231                        }
 232
 233                *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 234                nsh = (nsh_t *)info->rx_skb->data;
 235
 236                info->rx_count--;
 237
 238                if (info->rx_count == 0) {
 239
 240                        switch (info->rx_state) {
 241                        case RECV_WAIT_NSH:
 242                                info->rx_state = RECV_WAIT_DATA;
 243                                info->rx_count = nsh->len + (nsh->len & 0x0001);
 244                                break;
 245                        case RECV_WAIT_DATA:
 246                                bt_cb(info->rx_skb)->pkt_type = nsh->type;
 247
 248                                /* remove PAD byte if it exists */
 249                                if (nsh->len & 0x0001) {
 250                                        info->rx_skb->tail--;
 251                                        info->rx_skb->len--;
 252                                }
 253
 254                                /* remove NSH */
 255                                skb_pull(info->rx_skb, NSHL);
 256
 257                                switch (bt_cb(info->rx_skb)->pkt_type) {
 258                                case 0x80:
 259                                        /* control data for the Nokia Card */
 260                                        dtl1_control(info, info->rx_skb);
 261                                        break;
 262                                case 0x82:
 263                                case 0x83:
 264                                case 0x84:
 265                                        /* send frame to the HCI layer */
 266                                        info->rx_skb->dev = (void *) info->hdev;
 267                                        bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 268                                        hci_recv_frame(info->rx_skb);
 269                                        break;
 270                                default:
 271                                        /* unknown packet */
 272                                        BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 273                                        kfree_skb(info->rx_skb);
 274                                        break;
 275                                }
 276
 277                                info->rx_state = RECV_WAIT_NSH;
 278                                info->rx_count = NSHL;
 279                                info->rx_skb = NULL;
 280                                break;
 281                        }
 282
 283                }
 284
 285                /* Make sure we don't stay here too long */
 286                if (boguscount++ > 32)
 287                        break;
 288
 289        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 290}
 291
 292
 293static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 294{
 295        dtl1_info_t *info = dev_inst;
 296        unsigned int iobase;
 297        unsigned char msr;
 298        int boguscount = 0;
 299        int iir, lsr;
 300        irqreturn_t r = IRQ_NONE;
 301
 302        BUG_ON(!info->hdev);
 303
 304        iobase = info->p_dev->io.BasePort1;
 305
 306        spin_lock(&(info->lock));
 307
 308        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 309        while (iir) {
 310
 311                r = IRQ_HANDLED;
 312                /* Clear interrupt */
 313                lsr = inb(iobase + UART_LSR);
 314
 315                switch (iir) {
 316                case UART_IIR_RLSI:
 317                        BT_ERR("RLSI");
 318                        break;
 319                case UART_IIR_RDI:
 320                        /* Receive interrupt */
 321                        dtl1_receive(info);
 322                        break;
 323                case UART_IIR_THRI:
 324                        if (lsr & UART_LSR_THRE) {
 325                                /* Transmitter ready for data */
 326                                dtl1_write_wakeup(info);
 327                        }
 328                        break;
 329                default:
 330                        BT_ERR("Unhandled IIR=%#x", iir);
 331                        break;
 332                }
 333
 334                /* Make sure we don't stay here too long */
 335                if (boguscount++ > 100)
 336                        break;
 337
 338                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 339
 340        }
 341
 342        msr = inb(iobase + UART_MSR);
 343
 344        if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 345                info->ri_latch = msr & UART_MSR_RI;
 346                clear_bit(XMIT_WAITING, &(info->tx_state));
 347                dtl1_write_wakeup(info);
 348                r = IRQ_HANDLED;
 349        }
 350
 351        spin_unlock(&(info->lock));
 352
 353        return r;
 354}
 355
 356
 357
 358/* ======================== HCI interface ======================== */
 359
 360
 361static int dtl1_hci_open(struct hci_dev *hdev)
 362{
 363        set_bit(HCI_RUNNING, &(hdev->flags));
 364
 365        return 0;
 366}
 367
 368
 369static int dtl1_hci_flush(struct hci_dev *hdev)
 370{
 371        dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
 372
 373        /* Drop TX queue */
 374        skb_queue_purge(&(info->txq));
 375
 376        return 0;
 377}
 378
 379
 380static int dtl1_hci_close(struct hci_dev *hdev)
 381{
 382        if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 383                return 0;
 384
 385        dtl1_hci_flush(hdev);
 386
 387        return 0;
 388}
 389
 390
 391static int dtl1_hci_send_frame(struct sk_buff *skb)
 392{
 393        dtl1_info_t *info;
 394        struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 395        struct sk_buff *s;
 396        nsh_t nsh;
 397
 398        if (!hdev) {
 399                BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 400                return -ENODEV;
 401        }
 402
 403        info = (dtl1_info_t *)(hdev->driver_data);
 404
 405        switch (bt_cb(skb)->pkt_type) {
 406        case HCI_COMMAND_PKT:
 407                hdev->stat.cmd_tx++;
 408                nsh.type = 0x81;
 409                break;
 410        case HCI_ACLDATA_PKT:
 411                hdev->stat.acl_tx++;
 412                nsh.type = 0x82;
 413                break;
 414        case HCI_SCODATA_PKT:
 415                hdev->stat.sco_tx++;
 416                nsh.type = 0x83;
 417                break;
 418        };
 419
 420        nsh.zero = 0;
 421        nsh.len = skb->len;
 422
 423        s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 424        if (!s)
 425                return -ENOMEM;
 426
 427        skb_reserve(s, NSHL);
 428        skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 429        if (skb->len & 0x0001)
 430                *skb_put(s, 1) = 0;     /* PAD */
 431
 432        /* Prepend skb with Nokia frame header and queue */
 433        memcpy(skb_push(s, NSHL), &nsh, NSHL);
 434        skb_queue_tail(&(info->txq), s);
 435
 436        dtl1_write_wakeup(info);
 437
 438        kfree_skb(skb);
 439
 440        return 0;
 441}
 442
 443
 444static void dtl1_hci_destruct(struct hci_dev *hdev)
 445{
 446}
 447
 448
 449static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
 450{
 451        return -ENOIOCTLCMD;
 452}
 453
 454
 455
 456/* ======================== Card services HCI interaction ======================== */
 457
 458
 459static int dtl1_open(dtl1_info_t *info)
 460{
 461        unsigned long flags;
 462        unsigned int iobase = info->p_dev->io.BasePort1;
 463        struct hci_dev *hdev;
 464
 465        spin_lock_init(&(info->lock));
 466
 467        skb_queue_head_init(&(info->txq));
 468
 469        info->rx_state = RECV_WAIT_NSH;
 470        info->rx_count = NSHL;
 471        info->rx_skb = NULL;
 472
 473        set_bit(XMIT_WAITING, &(info->tx_state));
 474
 475        /* Initialize HCI device */
 476        hdev = hci_alloc_dev();
 477        if (!hdev) {
 478                BT_ERR("Can't allocate HCI device");
 479                return -ENOMEM;
 480        }
 481
 482        info->hdev = hdev;
 483
 484        hdev->type = HCI_PCCARD;
 485        hdev->driver_data = info;
 486        SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 487
 488        hdev->open     = dtl1_hci_open;
 489        hdev->close    = dtl1_hci_close;
 490        hdev->flush    = dtl1_hci_flush;
 491        hdev->send     = dtl1_hci_send_frame;
 492        hdev->destruct = dtl1_hci_destruct;
 493        hdev->ioctl    = dtl1_hci_ioctl;
 494
 495        hdev->owner = THIS_MODULE;
 496
 497        spin_lock_irqsave(&(info->lock), flags);
 498
 499        /* Reset UART */
 500        outb(0, iobase + UART_MCR);
 501
 502        /* Turn off interrupts */
 503        outb(0, iobase + UART_IER);
 504
 505        /* Initialize UART */
 506        outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 507        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 508
 509        info->ri_latch = inb(info->p_dev->io.BasePort1 + UART_MSR) & UART_MSR_RI;
 510
 511        /* Turn on interrupts */
 512        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 513
 514        spin_unlock_irqrestore(&(info->lock), flags);
 515
 516        /* Timeout before it is safe to send the first HCI packet */
 517        msleep(2000);
 518
 519        /* Register HCI device */
 520        if (hci_register_dev(hdev) < 0) {
 521                BT_ERR("Can't register HCI device");
 522                info->hdev = NULL;
 523                hci_free_dev(hdev);
 524                return -ENODEV;
 525        }
 526
 527        return 0;
 528}
 529
 530
 531static int dtl1_close(dtl1_info_t *info)
 532{
 533        unsigned long flags;
 534        unsigned int iobase = info->p_dev->io.BasePort1;
 535        struct hci_dev *hdev = info->hdev;
 536
 537        if (!hdev)
 538                return -ENODEV;
 539
 540        dtl1_hci_close(hdev);
 541
 542        spin_lock_irqsave(&(info->lock), flags);
 543
 544        /* Reset UART */
 545        outb(0, iobase + UART_MCR);
 546
 547        /* Turn off interrupts */
 548        outb(0, iobase + UART_IER);
 549
 550        spin_unlock_irqrestore(&(info->lock), flags);
 551
 552        if (hci_unregister_dev(hdev) < 0)
 553                BT_ERR("Can't unregister HCI device %s", hdev->name);
 554
 555        hci_free_dev(hdev);
 556
 557        return 0;
 558}
 559
 560static int dtl1_probe(struct pcmcia_device *link)
 561{
 562        dtl1_info_t *info;
 563
 564        /* Create new info device */
 565        info = kzalloc(sizeof(*info), GFP_KERNEL);
 566        if (!info)
 567                return -ENOMEM;
 568
 569        info->p_dev = link;
 570        link->priv = info;
 571
 572        link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 573        link->io.NumPorts1 = 8;
 574        link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING | IRQ_HANDLE_PRESENT;
 575        link->irq.IRQInfo1 = IRQ_LEVEL_ID;
 576
 577        link->irq.Handler = dtl1_interrupt;
 578        link->irq.Instance = info;
 579
 580        link->conf.Attributes = CONF_ENABLE_IRQ;
 581        link->conf.IntType = INT_MEMORY_AND_IO;
 582
 583        return dtl1_config(link);
 584}
 585
 586
 587static void dtl1_detach(struct pcmcia_device *link)
 588{
 589        dtl1_info_t *info = link->priv;
 590
 591        dtl1_release(link);
 592
 593        kfree(info);
 594}
 595
 596static int dtl1_confcheck(struct pcmcia_device *p_dev,
 597                          cistpl_cftable_entry_t *cf,
 598                          cistpl_cftable_entry_t *dflt,
 599                          unsigned int vcc,
 600                          void *priv_data)
 601{
 602        if ((cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
 603                p_dev->io.BasePort1 = cf->io.win[0].base;
 604                p_dev->io.NumPorts1 = cf->io.win[0].len;        /*yo */
 605                p_dev->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
 606                if (!pcmcia_request_io(p_dev, &p_dev->io))
 607                        return 0;
 608        }
 609        return -ENODEV;
 610}
 611
 612static int dtl1_config(struct pcmcia_device *link)
 613{
 614        dtl1_info_t *info = link->priv;
 615        int i;
 616
 617        /* Look for a generic full-sized window */
 618        link->io.NumPorts1 = 8;
 619        if (!pcmcia_loop_config(link, dtl1_confcheck, NULL))
 620                goto failed;
 621
 622        i = pcmcia_request_irq(link, &link->irq);
 623        if (i != 0) {
 624                cs_error(link, RequestIRQ, i);
 625                link->irq.AssignedIRQ = 0;
 626        }
 627
 628        i = pcmcia_request_configuration(link, &link->conf);
 629        if (i != 0) {
 630                cs_error(link, RequestConfiguration, i);
 631                goto failed;
 632        }
 633
 634        if (dtl1_open(info) != 0)
 635                goto failed;
 636
 637        strcpy(info->node.dev_name, info->hdev->name);
 638        link->dev_node = &info->node;
 639
 640        return 0;
 641
 642failed:
 643        dtl1_release(link);
 644        return -ENODEV;
 645}
 646
 647
 648static void dtl1_release(struct pcmcia_device *link)
 649{
 650        dtl1_info_t *info = link->priv;
 651
 652        dtl1_close(info);
 653
 654        pcmcia_disable_device(link);
 655}
 656
 657
 658static struct pcmcia_device_id dtl1_ids[] = {
 659        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 660        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 661        PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 662        PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 663        PCMCIA_DEVICE_NULL
 664};
 665MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 666
 667static struct pcmcia_driver dtl1_driver = {
 668        .owner          = THIS_MODULE,
 669        .drv            = {
 670                .name   = "dtl1_cs",
 671        },
 672        .probe          = dtl1_probe,
 673        .remove         = dtl1_detach,
 674        .id_table       = dtl1_ids,
 675};
 676
 677static int __init init_dtl1_cs(void)
 678{
 679        return pcmcia_register_driver(&dtl1_driver);
 680}
 681
 682
 683static void __exit exit_dtl1_cs(void)
 684{
 685        pcmcia_unregister_driver(&dtl1_driver);
 686}
 687
 688module_init(init_dtl1_cs);
 689module_exit(exit_dtl1_cs);
 690