linux/drivers/bluetooth/dtl1_cs.c
<<
>>
Prefs
   1/*
   2 *
   3 *  A driver for Nokia Connectivity Card DTL-1 devices
   4 *
   5 *  Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>
   6 *
   7 *
   8 *  This program is free software; you can redistribute it and/or modify
   9 *  it under the terms of the GNU General Public License version 2 as
  10 *  published by the Free Software Foundation;
  11 *
  12 *  Software distributed under the License is distributed on an "AS
  13 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  14 *  implied. See the License for the specific language governing
  15 *  rights and limitations under the License.
  16 *
  17 *  The initial developer of the original code is David A. Hinds
  18 *  <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  19 *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  20 *
  21 */
  22
  23#include <linux/module.h>
  24
  25#include <linux/kernel.h>
  26#include <linux/init.h>
  27#include <linux/slab.h>
  28#include <linux/types.h>
  29#include <linux/delay.h>
  30#include <linux/errno.h>
  31#include <linux/ptrace.h>
  32#include <linux/ioport.h>
  33#include <linux/spinlock.h>
  34#include <linux/moduleparam.h>
  35
  36#include <linux/skbuff.h>
  37#include <linux/string.h>
  38#include <linux/serial.h>
  39#include <linux/serial_reg.h>
  40#include <linux/bitops.h>
  41#include <asm/system.h>
  42#include <asm/io.h>
  43
  44#include <pcmcia/cistpl.h>
  45#include <pcmcia/ciscode.h>
  46#include <pcmcia/ds.h>
  47#include <pcmcia/cisreg.h>
  48
  49#include <net/bluetooth/bluetooth.h>
  50#include <net/bluetooth/hci_core.h>
  51
  52
  53
  54/* ======================== Module parameters ======================== */
  55
  56
  57MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  58MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
  59MODULE_LICENSE("GPL");
  60
  61
  62
  63/* ======================== Local structures ======================== */
  64
  65
  66typedef struct dtl1_info_t {
  67        struct pcmcia_device *p_dev;
  68
  69        struct hci_dev *hdev;
  70
  71        spinlock_t lock;                /* For serializing operations */
  72
  73        unsigned long flowmask;         /* HCI flow mask */
  74        int ri_latch;
  75
  76        struct sk_buff_head txq;
  77        unsigned long tx_state;
  78
  79        unsigned long rx_state;
  80        unsigned long rx_count;
  81        struct sk_buff *rx_skb;
  82} dtl1_info_t;
  83
  84
  85static int dtl1_config(struct pcmcia_device *link);
  86static void dtl1_release(struct pcmcia_device *link);
  87
  88static void dtl1_detach(struct pcmcia_device *p_dev);
  89
  90
  91/* Transmit states  */
  92#define XMIT_SENDING  1
  93#define XMIT_WAKEUP   2
  94#define XMIT_WAITING  8
  95
  96/* Receiver States */
  97#define RECV_WAIT_NSH   0
  98#define RECV_WAIT_DATA  1
  99
 100
 101typedef struct {
 102        u8 type;
 103        u8 zero;
 104        u16 len;
 105} __packed nsh_t;       /* Nokia Specific Header */
 106
 107#define NSHL  4                         /* Nokia Specific Header Length */
 108
 109
 110
 111/* ======================== Interrupt handling ======================== */
 112
 113
 114static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 115{
 116        int actual = 0;
 117
 118        /* Tx FIFO should be empty */
 119        if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
 120                return 0;
 121
 122        /* Fill FIFO with current frame */
 123        while ((fifo_size-- > 0) && (actual < len)) {
 124                /* Transmit next byte */
 125                outb(buf[actual], iobase + UART_TX);
 126                actual++;
 127        }
 128
 129        return actual;
 130}
 131
 132
 133static void dtl1_write_wakeup(dtl1_info_t *info)
 134{
 135        if (!info) {
 136                BT_ERR("Unknown device");
 137                return;
 138        }
 139
 140        if (test_bit(XMIT_WAITING, &(info->tx_state))) {
 141                set_bit(XMIT_WAKEUP, &(info->tx_state));
 142                return;
 143        }
 144
 145        if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
 146                set_bit(XMIT_WAKEUP, &(info->tx_state));
 147                return;
 148        }
 149
 150        do {
 151                register unsigned int iobase = info->p_dev->resource[0]->start;
 152                register struct sk_buff *skb;
 153                register int len;
 154
 155                clear_bit(XMIT_WAKEUP, &(info->tx_state));
 156
 157                if (!pcmcia_dev_present(info->p_dev))
 158                        return;
 159
 160                if (!(skb = skb_dequeue(&(info->txq))))
 161                        break;
 162
 163                /* Send frame */
 164                len = dtl1_write(iobase, 32, skb->data, skb->len);
 165
 166                if (len == skb->len) {
 167                        set_bit(XMIT_WAITING, &(info->tx_state));
 168                        kfree_skb(skb);
 169                } else {
 170                        skb_pull(skb, len);
 171                        skb_queue_head(&(info->txq), skb);
 172                }
 173
 174                info->hdev->stat.byte_tx += len;
 175
 176        } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 177
 178        clear_bit(XMIT_SENDING, &(info->tx_state));
 179}
 180
 181
 182static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
 183{
 184        u8 flowmask = *(u8 *)skb->data;
 185        int i;
 186
 187        printk(KERN_INFO "Bluetooth: Nokia control data =");
 188        for (i = 0; i < skb->len; i++) {
 189                printk(" %02x", skb->data[i]);
 190        }
 191        printk("\n");
 192
 193        /* transition to active state */
 194        if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
 195                clear_bit(XMIT_WAITING, &(info->tx_state));
 196                dtl1_write_wakeup(info);
 197        }
 198
 199        info->flowmask = flowmask;
 200
 201        kfree_skb(skb);
 202}
 203
 204
 205static void dtl1_receive(dtl1_info_t *info)
 206{
 207        unsigned int iobase;
 208        nsh_t *nsh;
 209        int boguscount = 0;
 210
 211        if (!info) {
 212                BT_ERR("Unknown device");
 213                return;
 214        }
 215
 216        iobase = info->p_dev->resource[0]->start;
 217
 218        do {
 219                info->hdev->stat.byte_rx++;
 220
 221                /* Allocate packet */
 222                if (info->rx_skb == NULL)
 223                        if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
 224                                BT_ERR("Can't allocate mem for new packet");
 225                                info->rx_state = RECV_WAIT_NSH;
 226                                info->rx_count = NSHL;
 227                                return;
 228                        }
 229
 230                *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 231                nsh = (nsh_t *)info->rx_skb->data;
 232
 233                info->rx_count--;
 234
 235                if (info->rx_count == 0) {
 236
 237                        switch (info->rx_state) {
 238                        case RECV_WAIT_NSH:
 239                                info->rx_state = RECV_WAIT_DATA;
 240                                info->rx_count = nsh->len + (nsh->len & 0x0001);
 241                                break;
 242                        case RECV_WAIT_DATA:
 243                                bt_cb(info->rx_skb)->pkt_type = nsh->type;
 244
 245                                /* remove PAD byte if it exists */
 246                                if (nsh->len & 0x0001) {
 247                                        info->rx_skb->tail--;
 248                                        info->rx_skb->len--;
 249                                }
 250
 251                                /* remove NSH */
 252                                skb_pull(info->rx_skb, NSHL);
 253
 254                                switch (bt_cb(info->rx_skb)->pkt_type) {
 255                                case 0x80:
 256                                        /* control data for the Nokia Card */
 257                                        dtl1_control(info, info->rx_skb);
 258                                        break;
 259                                case 0x82:
 260                                case 0x83:
 261                                case 0x84:
 262                                        /* send frame to the HCI layer */
 263                                        info->rx_skb->dev = (void *) info->hdev;
 264                                        bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 265                                        hci_recv_frame(info->rx_skb);
 266                                        break;
 267                                default:
 268                                        /* unknown packet */
 269                                        BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 270                                        kfree_skb(info->rx_skb);
 271                                        break;
 272                                }
 273
 274                                info->rx_state = RECV_WAIT_NSH;
 275                                info->rx_count = NSHL;
 276                                info->rx_skb = NULL;
 277                                break;
 278                        }
 279
 280                }
 281
 282                /* Make sure we don't stay here too long */
 283                if (boguscount++ > 32)
 284                        break;
 285
 286        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 287}
 288
 289
 290static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 291{
 292        dtl1_info_t *info = dev_inst;
 293        unsigned int iobase;
 294        unsigned char msr;
 295        int boguscount = 0;
 296        int iir, lsr;
 297        irqreturn_t r = IRQ_NONE;
 298
 299        if (!info || !info->hdev)
 300                /* our irq handler is shared */
 301                return IRQ_NONE;
 302
 303        iobase = info->p_dev->resource[0]->start;
 304
 305        spin_lock(&(info->lock));
 306
 307        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 308        while (iir) {
 309
 310                r = IRQ_HANDLED;
 311                /* Clear interrupt */
 312                lsr = inb(iobase + UART_LSR);
 313
 314                switch (iir) {
 315                case UART_IIR_RLSI:
 316                        BT_ERR("RLSI");
 317                        break;
 318                case UART_IIR_RDI:
 319                        /* Receive interrupt */
 320                        dtl1_receive(info);
 321                        break;
 322                case UART_IIR_THRI:
 323                        if (lsr & UART_LSR_THRE) {
 324                                /* Transmitter ready for data */
 325                                dtl1_write_wakeup(info);
 326                        }
 327                        break;
 328                default:
 329                        BT_ERR("Unhandled IIR=%#x", iir);
 330                        break;
 331                }
 332
 333                /* Make sure we don't stay here too long */
 334                if (boguscount++ > 100)
 335                        break;
 336
 337                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 338
 339        }
 340
 341        msr = inb(iobase + UART_MSR);
 342
 343        if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 344                info->ri_latch = msr & UART_MSR_RI;
 345                clear_bit(XMIT_WAITING, &(info->tx_state));
 346                dtl1_write_wakeup(info);
 347                r = IRQ_HANDLED;
 348        }
 349
 350        spin_unlock(&(info->lock));
 351
 352        return r;
 353}
 354
 355
 356
 357/* ======================== HCI interface ======================== */
 358
 359
 360static int dtl1_hci_open(struct hci_dev *hdev)
 361{
 362        set_bit(HCI_RUNNING, &(hdev->flags));
 363
 364        return 0;
 365}
 366
 367
 368static int dtl1_hci_flush(struct hci_dev *hdev)
 369{
 370        dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
 371
 372        /* Drop TX queue */
 373        skb_queue_purge(&(info->txq));
 374
 375        return 0;
 376}
 377
 378
 379static int dtl1_hci_close(struct hci_dev *hdev)
 380{
 381        if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 382                return 0;
 383
 384        dtl1_hci_flush(hdev);
 385
 386        return 0;
 387}
 388
 389
 390static int dtl1_hci_send_frame(struct sk_buff *skb)
 391{
 392        dtl1_info_t *info;
 393        struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 394        struct sk_buff *s;
 395        nsh_t nsh;
 396
 397        if (!hdev) {
 398                BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 399                return -ENODEV;
 400        }
 401
 402        info = (dtl1_info_t *)(hdev->driver_data);
 403
 404        switch (bt_cb(skb)->pkt_type) {
 405        case HCI_COMMAND_PKT:
 406                hdev->stat.cmd_tx++;
 407                nsh.type = 0x81;
 408                break;
 409        case HCI_ACLDATA_PKT:
 410                hdev->stat.acl_tx++;
 411                nsh.type = 0x82;
 412                break;
 413        case HCI_SCODATA_PKT:
 414                hdev->stat.sco_tx++;
 415                nsh.type = 0x83;
 416                break;
 417        default:
 418                return -EILSEQ;
 419        };
 420
 421        nsh.zero = 0;
 422        nsh.len = skb->len;
 423
 424        s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 425        if (!s)
 426                return -ENOMEM;
 427
 428        skb_reserve(s, NSHL);
 429        skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 430        if (skb->len & 0x0001)
 431                *skb_put(s, 1) = 0;     /* PAD */
 432
 433        /* Prepend skb with Nokia frame header and queue */
 434        memcpy(skb_push(s, NSHL), &nsh, NSHL);
 435        skb_queue_tail(&(info->txq), s);
 436
 437        dtl1_write_wakeup(info);
 438
 439        kfree_skb(skb);
 440
 441        return 0;
 442}
 443
 444
 445static void dtl1_hci_destruct(struct hci_dev *hdev)
 446{
 447}
 448
 449
 450static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
 451{
 452        return -ENOIOCTLCMD;
 453}
 454
 455
 456
 457/* ======================== Card services HCI interaction ======================== */
 458
 459
 460static int dtl1_open(dtl1_info_t *info)
 461{
 462        unsigned long flags;
 463        unsigned int iobase = info->p_dev->resource[0]->start;
 464        struct hci_dev *hdev;
 465
 466        spin_lock_init(&(info->lock));
 467
 468        skb_queue_head_init(&(info->txq));
 469
 470        info->rx_state = RECV_WAIT_NSH;
 471        info->rx_count = NSHL;
 472        info->rx_skb = NULL;
 473
 474        set_bit(XMIT_WAITING, &(info->tx_state));
 475
 476        /* Initialize HCI device */
 477        hdev = hci_alloc_dev();
 478        if (!hdev) {
 479                BT_ERR("Can't allocate HCI device");
 480                return -ENOMEM;
 481        }
 482
 483        info->hdev = hdev;
 484
 485        hdev->bus = HCI_PCCARD;
 486        hdev->driver_data = info;
 487        SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 488
 489        hdev->open     = dtl1_hci_open;
 490        hdev->close    = dtl1_hci_close;
 491        hdev->flush    = dtl1_hci_flush;
 492        hdev->send     = dtl1_hci_send_frame;
 493        hdev->destruct = dtl1_hci_destruct;
 494        hdev->ioctl    = dtl1_hci_ioctl;
 495
 496        hdev->owner = THIS_MODULE;
 497
 498        spin_lock_irqsave(&(info->lock), flags);
 499
 500        /* Reset UART */
 501        outb(0, iobase + UART_MCR);
 502
 503        /* Turn off interrupts */
 504        outb(0, iobase + UART_IER);
 505
 506        /* Initialize UART */
 507        outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 508        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 509
 510        info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
 511                                & UART_MSR_RI;
 512
 513        /* Turn on interrupts */
 514        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 515
 516        spin_unlock_irqrestore(&(info->lock), flags);
 517
 518        /* Timeout before it is safe to send the first HCI packet */
 519        msleep(2000);
 520
 521        /* Register HCI device */
 522        if (hci_register_dev(hdev) < 0) {
 523                BT_ERR("Can't register HCI device");
 524                info->hdev = NULL;
 525                hci_free_dev(hdev);
 526                return -ENODEV;
 527        }
 528
 529        return 0;
 530}
 531
 532
 533static int dtl1_close(dtl1_info_t *info)
 534{
 535        unsigned long flags;
 536        unsigned int iobase = info->p_dev->resource[0]->start;
 537        struct hci_dev *hdev = info->hdev;
 538
 539        if (!hdev)
 540                return -ENODEV;
 541
 542        dtl1_hci_close(hdev);
 543
 544        spin_lock_irqsave(&(info->lock), flags);
 545
 546        /* Reset UART */
 547        outb(0, iobase + UART_MCR);
 548
 549        /* Turn off interrupts */
 550        outb(0, iobase + UART_IER);
 551
 552        spin_unlock_irqrestore(&(info->lock), flags);
 553
 554        hci_unregister_dev(hdev);
 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->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 573
 574        return dtl1_config(link);
 575}
 576
 577
 578static void dtl1_detach(struct pcmcia_device *link)
 579{
 580        dtl1_info_t *info = link->priv;
 581
 582        dtl1_release(link);
 583
 584        kfree(info);
 585}
 586
 587static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
 588{
 589        if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
 590                return -ENODEV;
 591
 592        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 593        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 594
 595        return pcmcia_request_io(p_dev);
 596}
 597
 598static int dtl1_config(struct pcmcia_device *link)
 599{
 600        dtl1_info_t *info = link->priv;
 601        int i;
 602
 603        /* Look for a generic full-sized window */
 604        link->resource[0]->end = 8;
 605        if (pcmcia_loop_config(link, dtl1_confcheck, NULL) < 0)
 606                goto failed;
 607
 608        i = pcmcia_request_irq(link, dtl1_interrupt);
 609        if (i != 0)
 610                goto failed;
 611
 612        i = pcmcia_enable_device(link);
 613        if (i != 0)
 614                goto failed;
 615
 616        if (dtl1_open(info) != 0)
 617                goto failed;
 618
 619        return 0;
 620
 621failed:
 622        dtl1_release(link);
 623        return -ENODEV;
 624}
 625
 626
 627static void dtl1_release(struct pcmcia_device *link)
 628{
 629        dtl1_info_t *info = link->priv;
 630
 631        dtl1_close(info);
 632
 633        pcmcia_disable_device(link);
 634}
 635
 636
 637static const struct pcmcia_device_id dtl1_ids[] = {
 638        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 639        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 640        PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 641        PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 642        PCMCIA_DEVICE_NULL
 643};
 644MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 645
 646static struct pcmcia_driver dtl1_driver = {
 647        .owner          = THIS_MODULE,
 648        .name           = "dtl1_cs",
 649        .probe          = dtl1_probe,
 650        .remove         = dtl1_detach,
 651        .id_table       = dtl1_ids,
 652};
 653
 654static int __init init_dtl1_cs(void)
 655{
 656        return pcmcia_register_driver(&dtl1_driver);
 657}
 658
 659
 660static void __exit exit_dtl1_cs(void)
 661{
 662        pcmcia_unregister_driver(&dtl1_driver);
 663}
 664
 665module_init(init_dtl1_cs);
 666module_exit(exit_dtl1_cs);
 667