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
  65typedef struct dtl1_info_t {
  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} dtl1_info_t;
  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
  97typedef struct {
  98        u8 type;
  99        u8 zero;
 100        u16 len;
 101} __packed nsh_t;       /* 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(dtl1_info_t *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                if (!(skb = skb_dequeue(&(info->txq))))
 157                        break;
 158
 159                /* Send frame */
 160                len = dtl1_write(iobase, 32, skb->data, skb->len);
 161
 162                if (len == skb->len) {
 163                        set_bit(XMIT_WAITING, &(info->tx_state));
 164                        kfree_skb(skb);
 165                } else {
 166                        skb_pull(skb, len);
 167                        skb_queue_head(&(info->txq), skb);
 168                }
 169
 170                info->hdev->stat.byte_tx += len;
 171
 172        } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 173
 174        clear_bit(XMIT_SENDING, &(info->tx_state));
 175}
 176
 177
 178static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
 179{
 180        u8 flowmask = *(u8 *)skb->data;
 181        int i;
 182
 183        printk(KERN_INFO "Bluetooth: Nokia control data =");
 184        for (i = 0; i < skb->len; i++) {
 185                printk(" %02x", skb->data[i]);
 186        }
 187        printk("\n");
 188
 189        /* transition to active state */
 190        if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
 191                clear_bit(XMIT_WAITING, &(info->tx_state));
 192                dtl1_write_wakeup(info);
 193        }
 194
 195        info->flowmask = flowmask;
 196
 197        kfree_skb(skb);
 198}
 199
 200
 201static void dtl1_receive(dtl1_info_t *info)
 202{
 203        unsigned int iobase;
 204        nsh_t *nsh;
 205        int boguscount = 0;
 206
 207        if (!info) {
 208                BT_ERR("Unknown device");
 209                return;
 210        }
 211
 212        iobase = info->p_dev->resource[0]->start;
 213
 214        do {
 215                info->hdev->stat.byte_rx++;
 216
 217                /* Allocate packet */
 218                if (info->rx_skb == NULL)
 219                        if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
 220                                BT_ERR("Can't allocate mem for new packet");
 221                                info->rx_state = RECV_WAIT_NSH;
 222                                info->rx_count = NSHL;
 223                                return;
 224                        }
 225
 226                *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 227                nsh = (nsh_t *)info->rx_skb->data;
 228
 229                info->rx_count--;
 230
 231                if (info->rx_count == 0) {
 232
 233                        switch (info->rx_state) {
 234                        case RECV_WAIT_NSH:
 235                                info->rx_state = RECV_WAIT_DATA;
 236                                info->rx_count = nsh->len + (nsh->len & 0x0001);
 237                                break;
 238                        case RECV_WAIT_DATA:
 239                                bt_cb(info->rx_skb)->pkt_type = nsh->type;
 240
 241                                /* remove PAD byte if it exists */
 242                                if (nsh->len & 0x0001) {
 243                                        info->rx_skb->tail--;
 244                                        info->rx_skb->len--;
 245                                }
 246
 247                                /* remove NSH */
 248                                skb_pull(info->rx_skb, NSHL);
 249
 250                                switch (bt_cb(info->rx_skb)->pkt_type) {
 251                                case 0x80:
 252                                        /* control data for the Nokia Card */
 253                                        dtl1_control(info, info->rx_skb);
 254                                        break;
 255                                case 0x82:
 256                                case 0x83:
 257                                case 0x84:
 258                                        /* send frame to the HCI layer */
 259                                        bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 260                                        hci_recv_frame(info->hdev, info->rx_skb);
 261                                        break;
 262                                default:
 263                                        /* unknown packet */
 264                                        BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 265                                        kfree_skb(info->rx_skb);
 266                                        break;
 267                                }
 268
 269                                info->rx_state = RECV_WAIT_NSH;
 270                                info->rx_count = NSHL;
 271                                info->rx_skb = NULL;
 272                                break;
 273                        }
 274
 275                }
 276
 277                /* Make sure we don't stay here too long */
 278                if (boguscount++ > 32)
 279                        break;
 280
 281        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 282}
 283
 284
 285static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 286{
 287        dtl1_info_t *info = dev_inst;
 288        unsigned int iobase;
 289        unsigned char msr;
 290        int boguscount = 0;
 291        int iir, lsr;
 292        irqreturn_t r = IRQ_NONE;
 293
 294        if (!info || !info->hdev)
 295                /* our irq handler is shared */
 296                return IRQ_NONE;
 297
 298        iobase = info->p_dev->resource[0]->start;
 299
 300        spin_lock(&(info->lock));
 301
 302        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 303        while (iir) {
 304
 305                r = IRQ_HANDLED;
 306                /* Clear interrupt */
 307                lsr = inb(iobase + UART_LSR);
 308
 309                switch (iir) {
 310                case UART_IIR_RLSI:
 311                        BT_ERR("RLSI");
 312                        break;
 313                case UART_IIR_RDI:
 314                        /* Receive interrupt */
 315                        dtl1_receive(info);
 316                        break;
 317                case UART_IIR_THRI:
 318                        if (lsr & UART_LSR_THRE) {
 319                                /* Transmitter ready for data */
 320                                dtl1_write_wakeup(info);
 321                        }
 322                        break;
 323                default:
 324                        BT_ERR("Unhandled IIR=%#x", iir);
 325                        break;
 326                }
 327
 328                /* Make sure we don't stay here too long */
 329                if (boguscount++ > 100)
 330                        break;
 331
 332                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 333
 334        }
 335
 336        msr = inb(iobase + UART_MSR);
 337
 338        if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 339                info->ri_latch = msr & UART_MSR_RI;
 340                clear_bit(XMIT_WAITING, &(info->tx_state));
 341                dtl1_write_wakeup(info);
 342                r = IRQ_HANDLED;
 343        }
 344
 345        spin_unlock(&(info->lock));
 346
 347        return r;
 348}
 349
 350
 351
 352/* ======================== HCI interface ======================== */
 353
 354
 355static int dtl1_hci_open(struct hci_dev *hdev)
 356{
 357        set_bit(HCI_RUNNING, &(hdev->flags));
 358
 359        return 0;
 360}
 361
 362
 363static int dtl1_hci_flush(struct hci_dev *hdev)
 364{
 365        dtl1_info_t *info = hci_get_drvdata(hdev);
 366
 367        /* Drop TX queue */
 368        skb_queue_purge(&(info->txq));
 369
 370        return 0;
 371}
 372
 373
 374static int dtl1_hci_close(struct hci_dev *hdev)
 375{
 376        if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 377                return 0;
 378
 379        dtl1_hci_flush(hdev);
 380
 381        return 0;
 382}
 383
 384
 385static int dtl1_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 386{
 387        dtl1_info_t *info = hci_get_drvdata(hdev);
 388        struct sk_buff *s;
 389        nsh_t nsh;
 390
 391        switch (bt_cb(skb)->pkt_type) {
 392        case HCI_COMMAND_PKT:
 393                hdev->stat.cmd_tx++;
 394                nsh.type = 0x81;
 395                break;
 396        case HCI_ACLDATA_PKT:
 397                hdev->stat.acl_tx++;
 398                nsh.type = 0x82;
 399                break;
 400        case HCI_SCODATA_PKT:
 401                hdev->stat.sco_tx++;
 402                nsh.type = 0x83;
 403                break;
 404        default:
 405                return -EILSEQ;
 406        };
 407
 408        nsh.zero = 0;
 409        nsh.len = skb->len;
 410
 411        s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 412        if (!s)
 413                return -ENOMEM;
 414
 415        skb_reserve(s, NSHL);
 416        skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 417        if (skb->len & 0x0001)
 418                *skb_put(s, 1) = 0;     /* PAD */
 419
 420        /* Prepend skb with Nokia frame header and queue */
 421        memcpy(skb_push(s, NSHL), &nsh, NSHL);
 422        skb_queue_tail(&(info->txq), s);
 423
 424        dtl1_write_wakeup(info);
 425
 426        kfree_skb(skb);
 427
 428        return 0;
 429}
 430
 431
 432
 433/* ======================== Card services HCI interaction ======================== */
 434
 435
 436static int dtl1_open(dtl1_info_t *info)
 437{
 438        unsigned long flags;
 439        unsigned int iobase = info->p_dev->resource[0]->start;
 440        struct hci_dev *hdev;
 441
 442        spin_lock_init(&(info->lock));
 443
 444        skb_queue_head_init(&(info->txq));
 445
 446        info->rx_state = RECV_WAIT_NSH;
 447        info->rx_count = NSHL;
 448        info->rx_skb = NULL;
 449
 450        set_bit(XMIT_WAITING, &(info->tx_state));
 451
 452        /* Initialize HCI device */
 453        hdev = hci_alloc_dev();
 454        if (!hdev) {
 455                BT_ERR("Can't allocate HCI device");
 456                return -ENOMEM;
 457        }
 458
 459        info->hdev = hdev;
 460
 461        hdev->bus = HCI_PCCARD;
 462        hci_set_drvdata(hdev, info);
 463        SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 464
 465        hdev->open  = dtl1_hci_open;
 466        hdev->close = dtl1_hci_close;
 467        hdev->flush = dtl1_hci_flush;
 468        hdev->send  = dtl1_hci_send_frame;
 469
 470        spin_lock_irqsave(&(info->lock), flags);
 471
 472        /* Reset UART */
 473        outb(0, iobase + UART_MCR);
 474
 475        /* Turn off interrupts */
 476        outb(0, iobase + UART_IER);
 477
 478        /* Initialize UART */
 479        outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 480        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 481
 482        info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
 483                                & UART_MSR_RI;
 484
 485        /* Turn on interrupts */
 486        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 487
 488        spin_unlock_irqrestore(&(info->lock), flags);
 489
 490        /* Timeout before it is safe to send the first HCI packet */
 491        msleep(2000);
 492
 493        /* Register HCI device */
 494        if (hci_register_dev(hdev) < 0) {
 495                BT_ERR("Can't register HCI device");
 496                info->hdev = NULL;
 497                hci_free_dev(hdev);
 498                return -ENODEV;
 499        }
 500
 501        return 0;
 502}
 503
 504
 505static int dtl1_close(dtl1_info_t *info)
 506{
 507        unsigned long flags;
 508        unsigned int iobase = info->p_dev->resource[0]->start;
 509        struct hci_dev *hdev = info->hdev;
 510
 511        if (!hdev)
 512                return -ENODEV;
 513
 514        dtl1_hci_close(hdev);
 515
 516        spin_lock_irqsave(&(info->lock), flags);
 517
 518        /* Reset UART */
 519        outb(0, iobase + UART_MCR);
 520
 521        /* Turn off interrupts */
 522        outb(0, iobase + UART_IER);
 523
 524        spin_unlock_irqrestore(&(info->lock), flags);
 525
 526        hci_unregister_dev(hdev);
 527        hci_free_dev(hdev);
 528
 529        return 0;
 530}
 531
 532static int dtl1_probe(struct pcmcia_device *link)
 533{
 534        dtl1_info_t *info;
 535
 536        /* Create new info device */
 537        info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 538        if (!info)
 539                return -ENOMEM;
 540
 541        info->p_dev = link;
 542        link->priv = info;
 543
 544        link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 545
 546        return dtl1_config(link);
 547}
 548
 549
 550static void dtl1_detach(struct pcmcia_device *link)
 551{
 552        dtl1_info_t *info = link->priv;
 553
 554        dtl1_close(info);
 555        pcmcia_disable_device(link);
 556}
 557
 558static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
 559{
 560        if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
 561                return -ENODEV;
 562
 563        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 564        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 565
 566        return pcmcia_request_io(p_dev);
 567}
 568
 569static int dtl1_config(struct pcmcia_device *link)
 570{
 571        dtl1_info_t *info = link->priv;
 572        int ret;
 573
 574        /* Look for a generic full-sized window */
 575        link->resource[0]->end = 8;
 576        ret = pcmcia_loop_config(link, dtl1_confcheck, NULL);
 577        if (ret)
 578                goto failed;
 579
 580        ret = pcmcia_request_irq(link, dtl1_interrupt);
 581        if (ret)
 582                goto failed;
 583
 584        ret = pcmcia_enable_device(link);
 585        if (ret)
 586                goto failed;
 587
 588        ret = dtl1_open(info);
 589        if (ret)
 590                goto failed;
 591
 592        return 0;
 593
 594failed:
 595        dtl1_detach(link);
 596        return ret;
 597}
 598
 599static const struct pcmcia_device_id dtl1_ids[] = {
 600        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 601        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 602        PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 603        PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 604        PCMCIA_DEVICE_NULL
 605};
 606MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 607
 608static struct pcmcia_driver dtl1_driver = {
 609        .owner          = THIS_MODULE,
 610        .name           = "dtl1_cs",
 611        .probe          = dtl1_probe,
 612        .remove         = dtl1_detach,
 613        .id_table       = dtl1_ids,
 614};
 615module_pcmcia_driver(dtl1_driver);
 616
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