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                                bt_cb(info->rx_skb)->pkt_type = nsh->type;
 243
 244                                /* remove PAD byte if it exists */
 245                                if (nsh->len & 0x0001) {
 246                                        info->rx_skb->tail--;
 247                                        info->rx_skb->len--;
 248                                }
 249
 250                                /* remove NSH */
 251                                skb_pull(info->rx_skb, NSHL);
 252
 253                                switch (bt_cb(info->rx_skb)->pkt_type) {
 254                                case 0x80:
 255                                        /* control data for the Nokia Card */
 256                                        dtl1_control(info, info->rx_skb);
 257                                        break;
 258                                case 0x82:
 259                                case 0x83:
 260                                case 0x84:
 261                                        /* send frame to the HCI layer */
 262                                        bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 263                                        hci_recv_frame(info->hdev, info->rx_skb);
 264                                        break;
 265                                default:
 266                                        /* unknown packet */
 267                                        BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 268                                        kfree_skb(info->rx_skb);
 269                                        break;
 270                                }
 271
 272                                info->rx_state = RECV_WAIT_NSH;
 273                                info->rx_count = NSHL;
 274                                info->rx_skb = NULL;
 275                                break;
 276                        }
 277
 278                }
 279
 280                /* Make sure we don't stay here too long */
 281                if (boguscount++ > 32)
 282                        break;
 283
 284        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 285}
 286
 287
 288static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 289{
 290        struct dtl1_info *info = dev_inst;
 291        unsigned int iobase;
 292        unsigned char msr;
 293        int boguscount = 0;
 294        int iir, lsr;
 295        irqreturn_t r = IRQ_NONE;
 296
 297        if (!info || !info->hdev)
 298                /* our irq handler is shared */
 299                return IRQ_NONE;
 300
 301        iobase = info->p_dev->resource[0]->start;
 302
 303        spin_lock(&(info->lock));
 304
 305        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 306        while (iir) {
 307
 308                r = IRQ_HANDLED;
 309                /* Clear interrupt */
 310                lsr = inb(iobase + UART_LSR);
 311
 312                switch (iir) {
 313                case UART_IIR_RLSI:
 314                        BT_ERR("RLSI");
 315                        break;
 316                case UART_IIR_RDI:
 317                        /* Receive interrupt */
 318                        dtl1_receive(info);
 319                        break;
 320                case UART_IIR_THRI:
 321                        if (lsr & UART_LSR_THRE) {
 322                                /* Transmitter ready for data */
 323                                dtl1_write_wakeup(info);
 324                        }
 325                        break;
 326                default:
 327                        BT_ERR("Unhandled IIR=%#x", iir);
 328                        break;
 329                }
 330
 331                /* Make sure we don't stay here too long */
 332                if (boguscount++ > 100)
 333                        break;
 334
 335                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 336
 337        }
 338
 339        msr = inb(iobase + UART_MSR);
 340
 341        if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 342                info->ri_latch = msr & UART_MSR_RI;
 343                clear_bit(XMIT_WAITING, &(info->tx_state));
 344                dtl1_write_wakeup(info);
 345                r = IRQ_HANDLED;
 346        }
 347
 348        spin_unlock(&(info->lock));
 349
 350        return r;
 351}
 352
 353
 354
 355/* ======================== HCI interface ======================== */
 356
 357
 358static int dtl1_hci_open(struct hci_dev *hdev)
 359{
 360        set_bit(HCI_RUNNING, &(hdev->flags));
 361
 362        return 0;
 363}
 364
 365
 366static int dtl1_hci_flush(struct hci_dev *hdev)
 367{
 368        struct dtl1_info *info = hci_get_drvdata(hdev);
 369
 370        /* Drop TX queue */
 371        skb_queue_purge(&(info->txq));
 372
 373        return 0;
 374}
 375
 376
 377static int dtl1_hci_close(struct hci_dev *hdev)
 378{
 379        if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 380                return 0;
 381
 382        dtl1_hci_flush(hdev);
 383
 384        return 0;
 385}
 386
 387
 388static int dtl1_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 389{
 390        struct dtl1_info *info = hci_get_drvdata(hdev);
 391        struct sk_buff *s;
 392        struct nsh nsh;
 393
 394        switch (bt_cb(skb)->pkt_type) {
 395        case HCI_COMMAND_PKT:
 396                hdev->stat.cmd_tx++;
 397                nsh.type = 0x81;
 398                break;
 399        case HCI_ACLDATA_PKT:
 400                hdev->stat.acl_tx++;
 401                nsh.type = 0x82;
 402                break;
 403        case HCI_SCODATA_PKT:
 404                hdev->stat.sco_tx++;
 405                nsh.type = 0x83;
 406                break;
 407        default:
 408                return -EILSEQ;
 409        };
 410
 411        nsh.zero = 0;
 412        nsh.len = skb->len;
 413
 414        s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 415        if (!s)
 416                return -ENOMEM;
 417
 418        skb_reserve(s, NSHL);
 419        skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 420        if (skb->len & 0x0001)
 421                *skb_put(s, 1) = 0;     /* PAD */
 422
 423        /* Prepend skb with Nokia frame header and queue */
 424        memcpy(skb_push(s, NSHL), &nsh, NSHL);
 425        skb_queue_tail(&(info->txq), s);
 426
 427        dtl1_write_wakeup(info);
 428
 429        kfree_skb(skb);
 430
 431        return 0;
 432}
 433
 434
 435
 436/* ======================== Card services HCI interaction ======================== */
 437
 438
 439static int dtl1_open(struct dtl1_info *info)
 440{
 441        unsigned long flags;
 442        unsigned int iobase = info->p_dev->resource[0]->start;
 443        struct hci_dev *hdev;
 444
 445        spin_lock_init(&(info->lock));
 446
 447        skb_queue_head_init(&(info->txq));
 448
 449        info->rx_state = RECV_WAIT_NSH;
 450        info->rx_count = NSHL;
 451        info->rx_skb = NULL;
 452
 453        set_bit(XMIT_WAITING, &(info->tx_state));
 454
 455        /* Initialize HCI device */
 456        hdev = hci_alloc_dev();
 457        if (!hdev) {
 458                BT_ERR("Can't allocate HCI device");
 459                return -ENOMEM;
 460        }
 461
 462        info->hdev = hdev;
 463
 464        hdev->bus = HCI_PCCARD;
 465        hci_set_drvdata(hdev, info);
 466        SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 467
 468        hdev->open  = dtl1_hci_open;
 469        hdev->close = dtl1_hci_close;
 470        hdev->flush = dtl1_hci_flush;
 471        hdev->send  = dtl1_hci_send_frame;
 472
 473        spin_lock_irqsave(&(info->lock), flags);
 474
 475        /* Reset UART */
 476        outb(0, iobase + UART_MCR);
 477
 478        /* Turn off interrupts */
 479        outb(0, iobase + UART_IER);
 480
 481        /* Initialize UART */
 482        outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 483        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 484
 485        info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
 486                                & UART_MSR_RI;
 487
 488        /* Turn on interrupts */
 489        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 490
 491        spin_unlock_irqrestore(&(info->lock), flags);
 492
 493        /* Timeout before it is safe to send the first HCI packet */
 494        msleep(2000);
 495
 496        /* Register HCI device */
 497        if (hci_register_dev(hdev) < 0) {
 498                BT_ERR("Can't register HCI device");
 499                info->hdev = NULL;
 500                hci_free_dev(hdev);
 501                return -ENODEV;
 502        }
 503
 504        return 0;
 505}
 506
 507
 508static int dtl1_close(struct dtl1_info *info)
 509{
 510        unsigned long flags;
 511        unsigned int iobase = info->p_dev->resource[0]->start;
 512        struct hci_dev *hdev = info->hdev;
 513
 514        if (!hdev)
 515                return -ENODEV;
 516
 517        dtl1_hci_close(hdev);
 518
 519        spin_lock_irqsave(&(info->lock), flags);
 520
 521        /* Reset UART */
 522        outb(0, iobase + UART_MCR);
 523
 524        /* Turn off interrupts */
 525        outb(0, iobase + UART_IER);
 526
 527        spin_unlock_irqrestore(&(info->lock), flags);
 528
 529        hci_unregister_dev(hdev);
 530        hci_free_dev(hdev);
 531
 532        return 0;
 533}
 534
 535static int dtl1_probe(struct pcmcia_device *link)
 536{
 537        struct dtl1_info *info;
 538
 539        /* Create new info device */
 540        info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 541        if (!info)
 542                return -ENOMEM;
 543
 544        info->p_dev = link;
 545        link->priv = info;
 546
 547        link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 548
 549        return dtl1_config(link);
 550}
 551
 552
 553static void dtl1_detach(struct pcmcia_device *link)
 554{
 555        struct dtl1_info *info = link->priv;
 556
 557        dtl1_close(info);
 558        pcmcia_disable_device(link);
 559}
 560
 561static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
 562{
 563        if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
 564                return -ENODEV;
 565
 566        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 567        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 568
 569        return pcmcia_request_io(p_dev);
 570}
 571
 572static int dtl1_config(struct pcmcia_device *link)
 573{
 574        struct dtl1_info *info = link->priv;
 575        int ret;
 576
 577        /* Look for a generic full-sized window */
 578        link->resource[0]->end = 8;
 579        ret = pcmcia_loop_config(link, dtl1_confcheck, NULL);
 580        if (ret)
 581                goto failed;
 582
 583        ret = pcmcia_request_irq(link, dtl1_interrupt);
 584        if (ret)
 585                goto failed;
 586
 587        ret = pcmcia_enable_device(link);
 588        if (ret)
 589                goto failed;
 590
 591        ret = dtl1_open(info);
 592        if (ret)
 593                goto failed;
 594
 595        return 0;
 596
 597failed:
 598        dtl1_detach(link);
 599        return ret;
 600}
 601
 602static const struct pcmcia_device_id dtl1_ids[] = {
 603        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 604        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 605        PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 606        PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 607        PCMCIA_DEVICE_NULL
 608};
 609MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 610
 611static struct pcmcia_driver dtl1_driver = {
 612        .owner          = THIS_MODULE,
 613        .name           = "dtl1_cs",
 614        .probe          = dtl1_probe,
 615        .remove         = dtl1_detach,
 616        .id_table       = dtl1_ids,
 617};
 618module_pcmcia_driver(dtl1_driver);
 619
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