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                                        info->rx_skb->dev = (void *) info->hdev;
 260                                        bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 261                                        hci_recv_frame(info->rx_skb);
 262                                        break;
 263                                default:
 264                                        /* unknown packet */
 265                                        BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 266                                        kfree_skb(info->rx_skb);
 267                                        break;
 268                                }
 269
 270                                info->rx_state = RECV_WAIT_NSH;
 271                                info->rx_count = NSHL;
 272                                info->rx_skb = NULL;
 273                                break;
 274                        }
 275
 276                }
 277
 278                /* Make sure we don't stay here too long */
 279                if (boguscount++ > 32)
 280                        break;
 281
 282        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 283}
 284
 285
 286static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 287{
 288        dtl1_info_t *info = dev_inst;
 289        unsigned int iobase;
 290        unsigned char msr;
 291        int boguscount = 0;
 292        int iir, lsr;
 293        irqreturn_t r = IRQ_NONE;
 294
 295        if (!info || !info->hdev)
 296                /* our irq handler is shared */
 297                return IRQ_NONE;
 298
 299        iobase = info->p_dev->resource[0]->start;
 300
 301        spin_lock(&(info->lock));
 302
 303        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 304        while (iir) {
 305
 306                r = IRQ_HANDLED;
 307                /* Clear interrupt */
 308                lsr = inb(iobase + UART_LSR);
 309
 310                switch (iir) {
 311                case UART_IIR_RLSI:
 312                        BT_ERR("RLSI");
 313                        break;
 314                case UART_IIR_RDI:
 315                        /* Receive interrupt */
 316                        dtl1_receive(info);
 317                        break;
 318                case UART_IIR_THRI:
 319                        if (lsr & UART_LSR_THRE) {
 320                                /* Transmitter ready for data */
 321                                dtl1_write_wakeup(info);
 322                        }
 323                        break;
 324                default:
 325                        BT_ERR("Unhandled IIR=%#x", iir);
 326                        break;
 327                }
 328
 329                /* Make sure we don't stay here too long */
 330                if (boguscount++ > 100)
 331                        break;
 332
 333                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 334
 335        }
 336
 337        msr = inb(iobase + UART_MSR);
 338
 339        if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 340                info->ri_latch = msr & UART_MSR_RI;
 341                clear_bit(XMIT_WAITING, &(info->tx_state));
 342                dtl1_write_wakeup(info);
 343                r = IRQ_HANDLED;
 344        }
 345
 346        spin_unlock(&(info->lock));
 347
 348        return r;
 349}
 350
 351
 352
 353/* ======================== HCI interface ======================== */
 354
 355
 356static int dtl1_hci_open(struct hci_dev *hdev)
 357{
 358        set_bit(HCI_RUNNING, &(hdev->flags));
 359
 360        return 0;
 361}
 362
 363
 364static int dtl1_hci_flush(struct hci_dev *hdev)
 365{
 366        dtl1_info_t *info = hci_get_drvdata(hdev);
 367
 368        /* Drop TX queue */
 369        skb_queue_purge(&(info->txq));
 370
 371        return 0;
 372}
 373
 374
 375static int dtl1_hci_close(struct hci_dev *hdev)
 376{
 377        if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 378                return 0;
 379
 380        dtl1_hci_flush(hdev);
 381
 382        return 0;
 383}
 384
 385
 386static int dtl1_hci_send_frame(struct sk_buff *skb)
 387{
 388        dtl1_info_t *info;
 389        struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 390        struct sk_buff *s;
 391        nsh_t nsh;
 392
 393        if (!hdev) {
 394                BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 395                return -ENODEV;
 396        }
 397
 398        info = hci_get_drvdata(hdev);
 399
 400        switch (bt_cb(skb)->pkt_type) {
 401        case HCI_COMMAND_PKT:
 402                hdev->stat.cmd_tx++;
 403                nsh.type = 0x81;
 404                break;
 405        case HCI_ACLDATA_PKT:
 406                hdev->stat.acl_tx++;
 407                nsh.type = 0x82;
 408                break;
 409        case HCI_SCODATA_PKT:
 410                hdev->stat.sco_tx++;
 411                nsh.type = 0x83;
 412                break;
 413        default:
 414                return -EILSEQ;
 415        };
 416
 417        nsh.zero = 0;
 418        nsh.len = skb->len;
 419
 420        s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 421        if (!s)
 422                return -ENOMEM;
 423
 424        skb_reserve(s, NSHL);
 425        skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 426        if (skb->len & 0x0001)
 427                *skb_put(s, 1) = 0;     /* PAD */
 428
 429        /* Prepend skb with Nokia frame header and queue */
 430        memcpy(skb_push(s, NSHL), &nsh, NSHL);
 431        skb_queue_tail(&(info->txq), s);
 432
 433        dtl1_write_wakeup(info);
 434
 435        kfree_skb(skb);
 436
 437        return 0;
 438}
 439
 440
 441static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
 442{
 443        return -ENOIOCTLCMD;
 444}
 445
 446
 447
 448/* ======================== Card services HCI interaction ======================== */
 449
 450
 451static int dtl1_open(dtl1_info_t *info)
 452{
 453        unsigned long flags;
 454        unsigned int iobase = info->p_dev->resource[0]->start;
 455        struct hci_dev *hdev;
 456
 457        spin_lock_init(&(info->lock));
 458
 459        skb_queue_head_init(&(info->txq));
 460
 461        info->rx_state = RECV_WAIT_NSH;
 462        info->rx_count = NSHL;
 463        info->rx_skb = NULL;
 464
 465        set_bit(XMIT_WAITING, &(info->tx_state));
 466
 467        /* Initialize HCI device */
 468        hdev = hci_alloc_dev();
 469        if (!hdev) {
 470                BT_ERR("Can't allocate HCI device");
 471                return -ENOMEM;
 472        }
 473
 474        info->hdev = hdev;
 475
 476        hdev->bus = HCI_PCCARD;
 477        hci_set_drvdata(hdev, info);
 478        SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 479
 480        hdev->open     = dtl1_hci_open;
 481        hdev->close    = dtl1_hci_close;
 482        hdev->flush    = dtl1_hci_flush;
 483        hdev->send     = dtl1_hci_send_frame;
 484        hdev->ioctl    = dtl1_hci_ioctl;
 485
 486        spin_lock_irqsave(&(info->lock), flags);
 487
 488        /* Reset UART */
 489        outb(0, iobase + UART_MCR);
 490
 491        /* Turn off interrupts */
 492        outb(0, iobase + UART_IER);
 493
 494        /* Initialize UART */
 495        outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 496        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 497
 498        info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
 499                                & UART_MSR_RI;
 500
 501        /* Turn on interrupts */
 502        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 503
 504        spin_unlock_irqrestore(&(info->lock), flags);
 505
 506        /* Timeout before it is safe to send the first HCI packet */
 507        msleep(2000);
 508
 509        /* Register HCI device */
 510        if (hci_register_dev(hdev) < 0) {
 511                BT_ERR("Can't register HCI device");
 512                info->hdev = NULL;
 513                hci_free_dev(hdev);
 514                return -ENODEV;
 515        }
 516
 517        return 0;
 518}
 519
 520
 521static int dtl1_close(dtl1_info_t *info)
 522{
 523        unsigned long flags;
 524        unsigned int iobase = info->p_dev->resource[0]->start;
 525        struct hci_dev *hdev = info->hdev;
 526
 527        if (!hdev)
 528                return -ENODEV;
 529
 530        dtl1_hci_close(hdev);
 531
 532        spin_lock_irqsave(&(info->lock), flags);
 533
 534        /* Reset UART */
 535        outb(0, iobase + UART_MCR);
 536
 537        /* Turn off interrupts */
 538        outb(0, iobase + UART_IER);
 539
 540        spin_unlock_irqrestore(&(info->lock), flags);
 541
 542        hci_unregister_dev(hdev);
 543        hci_free_dev(hdev);
 544
 545        return 0;
 546}
 547
 548static int dtl1_probe(struct pcmcia_device *link)
 549{
 550        dtl1_info_t *info;
 551
 552        /* Create new info device */
 553        info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 554        if (!info)
 555                return -ENOMEM;
 556
 557        info->p_dev = link;
 558        link->priv = info;
 559
 560        link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 561
 562        return dtl1_config(link);
 563}
 564
 565
 566static void dtl1_detach(struct pcmcia_device *link)
 567{
 568        dtl1_info_t *info = link->priv;
 569
 570        dtl1_close(info);
 571        pcmcia_disable_device(link);
 572}
 573
 574static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
 575{
 576        if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
 577                return -ENODEV;
 578
 579        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 580        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 581
 582        return pcmcia_request_io(p_dev);
 583}
 584
 585static int dtl1_config(struct pcmcia_device *link)
 586{
 587        dtl1_info_t *info = link->priv;
 588        int ret;
 589
 590        /* Look for a generic full-sized window */
 591        link->resource[0]->end = 8;
 592        ret = pcmcia_loop_config(link, dtl1_confcheck, NULL);
 593        if (ret)
 594                goto failed;
 595
 596        ret = pcmcia_request_irq(link, dtl1_interrupt);
 597        if (ret)
 598                goto failed;
 599
 600        ret = pcmcia_enable_device(link);
 601        if (ret)
 602                goto failed;
 603
 604        ret = dtl1_open(info);
 605        if (ret)
 606                goto failed;
 607
 608        return 0;
 609
 610failed:
 611        dtl1_detach(link);
 612        return ret;
 613}
 614
 615static const struct pcmcia_device_id dtl1_ids[] = {
 616        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 617        PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 618        PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 619        PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 620        PCMCIA_DEVICE_NULL
 621};
 622MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 623
 624static struct pcmcia_driver dtl1_driver = {
 625        .owner          = THIS_MODULE,
 626        .name           = "dtl1_cs",
 627        .probe          = dtl1_probe,
 628        .remove         = dtl1_detach,
 629        .id_table       = dtl1_ids,
 630};
 631module_pcmcia_driver(dtl1_driver);
 632
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