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/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
  56MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  57MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
  58MODULE_LICENSE("GPL");
  59
  60
  61
  62/* ======================== Local structures ======================== */
  63
  64
  65struct 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
  84static 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
  97struct 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
 110static 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
 129static 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
 179static 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
 202static 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                                hci_skb_pkt_type(info->rx_skb) = 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 (hci_skb_pkt_type(info->rx_skb)) {
 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                                        hci_skb_pkt_type(info->rx_skb) &= 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",
 268                                               hci_skb_pkt_type(info->rx_skb));
 269                                        kfree_skb(info->rx_skb);
 270                                        break;
 271                                }
 272
 273                                info->rx_state = RECV_WAIT_NSH;
 274                                info->rx_count = NSHL;
 275                                info->rx_skb = NULL;
 276                                break;
 277                        }
 278
 279                }
 280
 281                /* Make sure we don't stay here too long */
 282                if (boguscount++ > 32)
 283                        break;
 284
 285        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 286}
 287
 288
 289static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 290{
 291        struct dtl1_info *info = dev_inst;
 292        unsigned int iobase;
 293        unsigned char msr;
 294        int boguscount = 0;
 295        int iir, lsr;
 296        irqreturn_t r = IRQ_NONE;
 297
 298        if (!info || !info->hdev)
 299                /* our irq handler is shared */
 300                return IRQ_NONE;
 301
 302        iobase = info->p_dev->resource[0]->start;
 303
 304        spin_lock(&(info->lock));
 305
 306        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 307        while (iir) {
 308
 309                r = IRQ_HANDLED;
 310                /* Clear interrupt */
 311                lsr = inb(iobase + UART_LSR);
 312
 313                switch (iir) {
 314                case UART_IIR_RLSI:
 315                        BT_ERR("RLSI");
 316                        break;
 317                case UART_IIR_RDI:
 318                        /* Receive interrupt */
 319                        dtl1_receive(info);
 320                        break;
 321                case UART_IIR_THRI:
 322                        if (lsr & UART_LSR_THRE) {
 323                                /* Transmitter ready for data */
 324                                dtl1_write_wakeup(info);
 325                        }
 326                        break;
 327                default:
 328                        BT_ERR("Unhandled IIR=%#x", iir);
 329                        break;
 330                }
 331
 332                /* Make sure we don't stay here too long */
 333                if (boguscount++ > 100)
 334                        break;
 335
 336                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 337
 338        }
 339
 340        msr = inb(iobase + UART_MSR);
 341
 342        if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 343                info->ri_latch = msr & UART_MSR_RI;
 344                clear_bit(XMIT_WAITING, &(info->tx_state));
 345                dtl1_write_wakeup(info);
 346                r = IRQ_HANDLED;
 347        }
 348
 349        spin_unlock(&(info->lock));
 350
 351        return r;
 352}
 353
 354
 355
 356/* ======================== HCI interface ======================== */
 357
 358
 359static int dtl1_hci_open(struct hci_dev *hdev)
 360{
 361        return 0;
 362}
 363
 364
 365static int dtl1_hci_flush(struct hci_dev *hdev)
 366{
 367        struct dtl1_info *info = hci_get_drvdata(hdev);
 368
 369        /* Drop TX queue */
 370        skb_queue_purge(&(info->txq));
 371
 372        return 0;
 373}
 374
 375
 376static int dtl1_hci_close(struct hci_dev *hdev)
 377{
 378        dtl1_hci_flush(hdev);
 379
 380        return 0;
 381}
 382
 383
 384static int dtl1_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 385{
 386        struct dtl1_info *info = hci_get_drvdata(hdev);
 387        struct sk_buff *s;
 388        struct nsh nsh;
 389
 390        switch (hci_skb_pkt_type(skb)) {
 391        case HCI_COMMAND_PKT:
 392                hdev->stat.cmd_tx++;
 393                nsh.type = 0x81;
 394                break;
 395        case HCI_ACLDATA_PKT:
 396                hdev->stat.acl_tx++;
 397                nsh.type = 0x82;
 398                break;
 399        case HCI_SCODATA_PKT:
 400                hdev->stat.sco_tx++;
 401                nsh.type = 0x83;
 402                break;
 403        default:
 404                return -EILSEQ;
 405        }
 406
 407        nsh.zero = 0;
 408        nsh.len = skb->len;
 409
 410        s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 411        if (!s)
 412                return -ENOMEM;
 413
 414        skb_reserve(s, NSHL);
 415        skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 416        if (skb->len & 0x0001)
 417                *skb_put(s, 1) = 0;     /* PAD */
 418
 419        /* Prepend skb with Nokia frame header and queue */
 420        memcpy(skb_push(s, NSHL), &nsh, NSHL);
 421        skb_queue_tail(&(info->txq), s);
 422
 423        dtl1_write_wakeup(info);
 424
 425        kfree_skb(skb);
 426
 427        return 0;
 428}
 429
 430
 431
 432/* ======================== Card services HCI interaction ======================== */
 433
 434
 435static int dtl1_open(struct dtl1_info *info)
 436{
 437        unsigned long flags;
 438        unsigned int iobase = info->p_dev->resource[0]->start;
 439        struct hci_dev *hdev;
 440
 441        spin_lock_init(&(info->lock));
 442
 443        skb_queue_head_init(&(info->txq));
 444
 445        info->rx_state = RECV_WAIT_NSH;
 446        info->rx_count = NSHL;
 447        info->rx_skb = NULL;
 448
 449        set_bit(XMIT_WAITING, &(info->tx_state));
 450
 451        /* Initialize HCI device */
 452        hdev = hci_alloc_dev();
 453        if (!hdev) {
 454                BT_ERR("Can't allocate HCI device");
 455                return -ENOMEM;
 456        }
 457
 458        info->hdev = hdev;
 459
 460        hdev->bus = HCI_PCCARD;
 461        hci_set_drvdata(hdev, info);
 462        SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 463
 464        hdev->open  = dtl1_hci_open;
 465        hdev->close = dtl1_hci_close;
 466        hdev->flush = dtl1_hci_flush;
 467        hdev->send  = dtl1_hci_send_frame;
 468
 469        spin_lock_irqsave(&(info->lock), flags);
 470
 471        /* Reset UART */
 472        outb(0, iobase + UART_MCR);
 473
 474        /* Turn off interrupts */
 475        outb(0, iobase + UART_IER);
 476
 477        /* Initialize UART */
 478        outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 479        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 480
 481        info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
 482                                & UART_MSR_RI;
 483
 484        /* Turn on interrupts */
 485        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 486
 487        spin_unlock_irqrestore(&(info->lock), flags);
 488
 489        /* Timeout before it is safe to send the first HCI packet */
 490        msleep(2000);
 491
 492        /* Register HCI device */
 493        if (hci_register_dev(hdev) < 0) {
 494                BT_ERR("Can't register HCI device");
 495                info->hdev = NULL;
 496                hci_free_dev(hdev);
 497                return -ENODEV;
 498        }
 499
 500        return 0;
 501}
 502
 503
 504static int dtl1_close(struct dtl1_info *info)
 505{
 506        unsigned long flags;
 507        unsigned int iobase = info->p_dev->resource[0]->start;
 508        struct hci_dev *hdev = info->hdev;
 509
 510        if (!hdev)
 511                return -ENODEV;
 512
 513        dtl1_hci_close(hdev);
 514
 515        spin_lock_irqsave(&(info->lock), flags);
 516
 517        /* Reset UART */
 518        outb(0, iobase + UART_MCR);
 519
 520        /* Turn off interrupts */
 521        outb(0, iobase + UART_IER);
 522
 523        spin_unlock_irqrestore(&(info->lock), flags);
 524
 525        hci_unregister_dev(hdev);
 526        hci_free_dev(hdev);
 527
 528        return 0;
 529}
 530
 531static int dtl1_probe(struct pcmcia_device *link)
 532{
 533        struct dtl1_info *info;
 534
 535        /* Create new info device */
 536        info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 537        if (!info)
 538                return -ENOMEM;
 539
 540        info->p_dev = link;
 541        link->priv = info;
 542
 543        link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 544
 545        return dtl1_config(link);
 546}
 547
 548
 549static void dtl1_detach(struct pcmcia_device *link)
 550{
 551        struct dtl1_info *info = link->priv;
 552
 553        dtl1_close(info);
 554        pcmcia_disable_device(link);
 555}
 556
 557static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
 558{
 559        if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
 560                return -ENODEV;
 561
 562        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 563        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 564
 565        return pcmcia_request_io(p_dev);
 566}
 567
 568static int dtl1_config(struct pcmcia_device *link)
 569{
 570        struct dtl1_info *info = link->priv;
 571        int ret;
 572
 573        /* Look for a generic full-sized window */
 574        link->resource[0]->end = 8;
 575        ret = pcmcia_loop_config(link, dtl1_confcheck, NULL);
 576        if (ret)
 577                goto failed;
 578
 579        ret = pcmcia_request_irq(link, dtl1_interrupt);
 580        if (ret)
 581                goto failed;
 582
 583        ret = pcmcia_enable_device(link);
 584        if (ret)
 585                goto failed;
 586
 587        ret = dtl1_open(info);
 588        if (ret)
 589                goto failed;
 590
 591        return 0;
 592
 593failed:
 594        dtl1_detach(link);
 595        return ret;
 596}
 597
 598static const struct pcmcia_device_id dtl1_ids[] = {
 599        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 600        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 601        PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 602        PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 603        PCMCIA_DEVICE_NULL
 604};
 605MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 606
 607static struct pcmcia_driver dtl1_driver = {
 608        .owner          = THIS_MODULE,
 609        .name           = "dtl1_cs",
 610        .probe          = dtl1_probe,
 611        .remove         = dtl1_detach,
 612        .id_table       = dtl1_ids,
 613};
 614module_pcmcia_driver(dtl1_driver);
 615
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