drivers/isdn/hisax/st5481_usb.c

   1 /*
   2  * Driver for ST5481 USB ISDN modem
   3  *
   4  * Author       Frode Isaksen
   5  * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
   6  *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
   7  *
   8  * This software may be used and distributed according to the terms
   9  * of the GNU General Public License, incorporated herein by reference.
  10  *
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/usb.h>
  15 #include <linux/slab.h>
  16 #include "st5481.h"
  17
  18 static int st5481_isoc_flatten(struct urb *urb);
  19
  20 /* ======================================================================
  21  * control pipe
  22  */
  23
  24 /*
  25  * Send the next endpoint 0 request stored in the FIFO.
  26  * Called either by the completion or by usb_ctrl_msg.
  27  */
  28 static void usb_next_ctrl_msg(struct urb *urb,
  29                               struct st5481_adapter *adapter)
  30 {
  31         struct st5481_ctrl *ctrl = &adapter->ctrl;
  32         int r_index;
  33
  34         if (test_and_set_bit(0, &ctrl->busy)) {
  35                 return;
  36         }
  37
  38         if ((r_index = fifo_remove(&ctrl->msg_fifo.f)) < 0) {
  39                 test_and_clear_bit(0, &ctrl->busy);
  40                 return;
  41         }
  42         urb->setup_packet =
  43                 (unsigned char *)&ctrl->msg_fifo.data[r_index];
  44
  45         DBG(1, "request=0x%02x,value=0x%04x,index=%x",
  46             ((struct ctrl_msg *)urb->setup_packet)->dr.bRequest,
  47             ((struct ctrl_msg *)urb->setup_packet)->dr.wValue,
  48             ((struct ctrl_msg *)urb->setup_packet)->dr.wIndex);
  49
  50         // Prepare the URB
  51         urb->dev = adapter->usb_dev;
  52
  53         SUBMIT_URB(urb, GFP_ATOMIC);
  54 }
  55
  56 /*
  57  * Asynchronous endpoint 0 request (async version of usb_control_msg).
  58  * The request will be queued up in a FIFO if the endpoint is busy.
  59  */
  60 static void usb_ctrl_msg(struct st5481_adapter *adapter,
  61                          u8 request, u8 requesttype, u16 value, u16 index,
  62                          ctrl_complete_t complete, void *context)
  63 {
  64         struct st5481_ctrl *ctrl = &adapter->ctrl;
  65         int w_index;
  66         struct ctrl_msg *ctrl_msg;
  67
  68         if ((w_index = fifo_add(&ctrl->msg_fifo.f)) < 0) {
  69                 WARNING("control msg FIFO full");
  70                 return;
  71         }
  72         ctrl_msg = &ctrl->msg_fifo.data[w_index];
  73
  74         ctrl_msg->dr.bRequestType = requesttype;
  75         ctrl_msg->dr.bRequest = request;
  76         ctrl_msg->dr.wValue = cpu_to_le16p(&value);
  77         ctrl_msg->dr.wIndex = cpu_to_le16p(&index);
  78         ctrl_msg->dr.wLength = 0;
  79         ctrl_msg->complete = complete;
  80         ctrl_msg->context = context;
  81
  82         usb_next_ctrl_msg(ctrl->urb, adapter);
  83 }
  84
  85 /*
  86  * Asynchronous endpoint 0 device request.
  87  */
  88 void st5481_usb_device_ctrl_msg(struct st5481_adapter *adapter,
  89                                 u8 request, u16 value,
  90                                 ctrl_complete_t complete, void *context)
  91 {
  92         usb_ctrl_msg(adapter, request,
  93                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  94                      value, 0, complete, context);
  95 }
  96
  97 /*
  98  * Asynchronous pipe reset (async version of usb_clear_halt).
  99  */
 100 void st5481_usb_pipe_reset(struct st5481_adapter *adapter,
 101                            u_char pipe,
 102                            ctrl_complete_t complete, void *context)
 103 {
 104         DBG(1, "pipe=%02x", pipe);
 105
 106         usb_ctrl_msg(adapter,
 107                      USB_REQ_CLEAR_FEATURE, USB_DIR_OUT | USB_RECIP_ENDPOINT,
 108                      0, pipe, complete, context);
 109 }
 110
 111
 112 /*
 113   Physical level functions
 114 */
 115
 116 void st5481_ph_command(struct st5481_adapter *adapter, unsigned int command)
 117 {
 118         DBG(8, "command=%s", ST5481_CMD_string(command));
 119
 120         st5481_usb_device_ctrl_msg(adapter, TXCI, command, NULL, NULL);
 121 }
 122
 123 /*
 124  * The request on endpoint 0 has completed.
 125  * Call the user provided completion routine and try
 126  * to send the next request.
 127  */
 128 static void usb_ctrl_complete(struct urb *urb)
 129 {
 130         struct st5481_adapter *adapter = urb->context;
 131         struct st5481_ctrl *ctrl = &adapter->ctrl;
 132         struct ctrl_msg *ctrl_msg;
 133
 134         if (unlikely(urb->status < 0)) {
 135                 switch (urb->status) {
 136                 case -ENOENT:
 137                 case -ESHUTDOWN:
 138                 case -ECONNRESET:
 139                         DBG(1, "urb killed status %d", urb->status);
 140                         return; // Give up
 141                 default:
 142                         WARNING("urb status %d", urb->status);
 143                         break;
 144                 }
 145         }
 146
 147         ctrl_msg = (struct ctrl_msg *)urb->setup_packet;
 148
 149         if (ctrl_msg->dr.bRequest == USB_REQ_CLEAR_FEATURE) {
 150                 /* Special case handling for pipe reset */
 151                 le16_to_cpus(&ctrl_msg->dr.wIndex);
 152                 usb_reset_endpoint(adapter->usb_dev, ctrl_msg->dr.wIndex);
 153         }
 154
 155         if (ctrl_msg->complete)
 156                 ctrl_msg->complete(ctrl_msg->context);
 157
 158         clear_bit(0, &ctrl->busy);
 159
 160         // Try to send next control message
 161         usb_next_ctrl_msg(urb, adapter);
 162         return;
 163 }
 164
 165 /* ======================================================================
 166  * interrupt pipe
 167  */
 168
 169 /*
 170  * The interrupt endpoint will be called when any
 171  * of the 6 registers changes state (depending on masks).
 172  * Decode the register values and schedule a private event.
 173  * Called at interrupt.
 174  */
 175 static void usb_int_complete(struct urb *urb)
 176 {
 177         u8 *data = urb->transfer_buffer;
 178         u8 irqbyte;
 179         struct st5481_adapter *adapter = urb->context;
 180         int j;
 181         int status;
 182
 183         switch (urb->status) {
 184         case 0:
 185                 /* success */
 186                 break;
 187         case -ECONNRESET:
 188         case -ENOENT:
 189         case -ESHUTDOWN:
 190                 /* this urb is terminated, clean up */
 191                 DBG(2, "urb shutting down with status: %d", urb->status);
 192                 return;
 193         default:
 194                 WARNING("nonzero urb status received: %d", urb->status);
 195                 goto exit;
 196         }
 197
 198
 199         DBG_PACKET(2, data, INT_PKT_SIZE);
 200
 201         if (urb->actual_length == 0) {
 202                 goto exit;
 203         }
 204
 205         irqbyte = data[MPINT];
 206         if (irqbyte & DEN_INT)
 207                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_DEN, NULL);
 208
 209         if (irqbyte & DCOLL_INT)
 210                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_COLL, NULL);
 211
 212         irqbyte = data[FFINT_D];
 213         if (irqbyte & OUT_UNDERRUN)
 214                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_UNDERRUN, NULL);
 215
 216         if (irqbyte & OUT_DOWN)
 217                 ;//             printk("OUT_DOWN\n");
 218
 219         irqbyte = data[MPINT];
 220         if (irqbyte & RXCI_INT)
 221                 FsmEvent(&adapter->l1m, data[CCIST] & 0x0f, NULL);
 222
 223         for (j = 0; j < 2; j++)
 224                 adapter->bcs[j].b_out.flow_event |= data[FFINT_B1 + j];
 225
 226         urb->actual_length = 0;
 227
 228 exit:
 229         status = usb_submit_urb(urb, GFP_ATOMIC);
 230         if (status)
 231                 WARNING("usb_submit_urb failed with result %d", status);
 232 }
 233
 234 /* ======================================================================
 235  * initialization
 236  */
 237
 238 int st5481_setup_usb(struct st5481_adapter *adapter)
 239 {
 240         struct usb_device *dev = adapter->usb_dev;
 241         struct st5481_ctrl *ctrl = &adapter->ctrl;
 242         struct st5481_intr *intr = &adapter->intr;
 243         struct usb_interface *intf;
 244         struct usb_host_interface *altsetting = NULL;
 245         struct usb_host_endpoint *endpoint;
 246         int status;
 247         struct urb *urb;
 248         u8 *buf;
 249
 250         DBG(2, "");
 251
 252         if ((status = usb_reset_configuration(dev)) < 0) {
 253                 WARNING("reset_configuration failed,status=%d", status);
 254                 return status;
 255         }
 256
 257         intf = usb_ifnum_to_if(dev, 0);
 258         if (intf)
 259                 altsetting = usb_altnum_to_altsetting(intf, 3);
 260         if (!altsetting)
 261                 return -ENXIO;
 262
 263         // Check if the config is sane
 264         if (altsetting->desc.bNumEndpoints != 7) {
 265                 WARNING("expecting 7 got %d endpoints!", altsetting->desc.bNumEndpoints);
 266                 return -EINVAL;
 267         }
 268
 269         // The descriptor is wrong for some early samples of the ST5481 chip
 270         altsetting->endpoint[3].desc.wMaxPacketSize = cpu_to_le16(32);
 271         altsetting->endpoint[4].desc.wMaxPacketSize = cpu_to_le16(32);
 272
 273         // Use alternative setting 3 on interface 0 to have 2B+D
 274         if ((status = usb_set_interface(dev, 0, 3)) < 0) {
 275                 WARNING("usb_set_interface failed,status=%d", status);
 276                 return status;
 277         }
 278
 279         // Allocate URB for control endpoint
 280         urb = usb_alloc_urb(0, GFP_KERNEL);
 281         if (!urb) {
 282                 return -ENOMEM;
 283         }
 284         ctrl->urb = urb;
 285
 286         // Fill the control URB
 287         usb_fill_control_urb(urb, dev,
 288                              usb_sndctrlpipe(dev, 0),
 289                              NULL, NULL, 0, usb_ctrl_complete, adapter);
 290
 291
 292         fifo_init(&ctrl->msg_fifo.f, ARRAY_SIZE(ctrl->msg_fifo.data));
 293
 294         // Allocate URBs and buffers for interrupt endpoint
 295         urb = usb_alloc_urb(0, GFP_KERNEL);
 296         if (!urb) {
 297                 goto err1;
 298         }
 299         intr->urb = urb;
 300
 301         buf = kmalloc(INT_PKT_SIZE, GFP_KERNEL);
 302         if (!buf) {
 303                 goto err2;
 304         }
 305
 306         endpoint = &altsetting->endpoint[EP_INT-1];
 307
 308         // Fill the interrupt URB
 309         usb_fill_int_urb(urb, dev,
 310                          usb_rcvintpipe(dev, endpoint->desc.bEndpointAddress),
 311                          buf, INT_PKT_SIZE,
 312                          usb_int_complete, adapter,
 313                          endpoint->desc.bInterval);
 314
 315         return 0;
 316 err2:
 317         usb_free_urb(intr->urb);
 318         intr->urb = NULL;
 319 err1:
 320         usb_free_urb(ctrl->urb);
 321         ctrl->urb = NULL;
 322
 323         return -ENOMEM;
 324 }
 325
 326 /*
 327  * Release buffers and URBs for the interrupt and control
 328  * endpoint.
 329  */
 330 void st5481_release_usb(struct st5481_adapter *adapter)
 331 {
 332         struct st5481_intr *intr = &adapter->intr;
 333         struct st5481_ctrl *ctrl = &adapter->ctrl;
 334
 335         DBG(1, "");
 336
 337         // Stop and free Control and Interrupt URBs
 338         usb_kill_urb(ctrl->urb);
 339         kfree(ctrl->urb->transfer_buffer);
 340         usb_free_urb(ctrl->urb);
 341         ctrl->urb = NULL;
 342
 343         usb_kill_urb(intr->urb);
 344         kfree(intr->urb->transfer_buffer);
 345         usb_free_urb(intr->urb);
 346         intr->urb = NULL;
 347 }
 348
 349 /*
 350  *  Initialize the adapter.
 351  */
 352 void st5481_start(struct st5481_adapter *adapter)
 353 {
 354         static const u8 init_cmd_table[] = {
 355                 SET_DEFAULT, 0,
 356                 STT, 0,
 357                 SDA_MIN, 0x0d,
 358                 SDA_MAX, 0x29,
 359                 SDELAY_VALUE, 0x14,
 360                 GPIO_DIR, 0x01,
 361                 GPIO_OUT, RED_LED,
 362 //              FFCTRL_OUT_D,4,
 363 //              FFCTRH_OUT_D,12,
 364                 FFCTRL_OUT_B1, 6,
 365                 FFCTRH_OUT_B1, 20,
 366                 FFCTRL_OUT_B2, 6,
 367                 FFCTRH_OUT_B2, 20,
 368                 MPMSK, RXCI_INT + DEN_INT + DCOLL_INT,
 369                 0
 370         };
 371         struct st5481_intr *intr = &adapter->intr;
 372         int i = 0;
 373         u8 request, value;
 374
 375         DBG(8, "");
 376
 377         adapter->leds = RED_LED;
 378
 379         // Start receiving on the interrupt endpoint
 380         SUBMIT_URB(intr->urb, GFP_KERNEL);
 381
 382         while ((request = init_cmd_table[i++])) {
 383                 value = init_cmd_table[i++];
 384                 st5481_usb_device_ctrl_msg(adapter, request, value, NULL, NULL);
 385         }
 386         st5481_ph_command(adapter, ST5481_CMD_PUP);
 387 }
 388
 389 /*
 390  * Reset the adapter to default values.
 391  */
 392 void st5481_stop(struct st5481_adapter *adapter)
 393 {
 394         DBG(8, "");
 395
 396         st5481_usb_device_ctrl_msg(adapter, SET_DEFAULT, 0, NULL, NULL);
 397 }
 398
 399 /* ======================================================================
 400  * isochronous USB  helpers
 401  */
 402
 403 static void
 404 fill_isoc_urb(struct urb *urb, struct usb_device *dev,
 405               unsigned int pipe, void *buf, int num_packets,
 406               int packet_size, usb_complete_t complete,
 407               void *context)
 408 {
 409         int k;
 410
 411         urb->dev = dev;
 412         urb->pipe = pipe;
 413         urb->interval = 1;
 414         urb->transfer_buffer = buf;
 415         urb->number_of_packets = num_packets;
 416         urb->transfer_buffer_length = num_packets * packet_size;
 417         urb->actual_length = 0;
 418         urb->complete = complete;
 419         urb->context = context;
 420         urb->transfer_flags = URB_ISO_ASAP;
 421         for (k = 0; k < num_packets; k++) {
 422                 urb->iso_frame_desc[k].offset = packet_size * k;
 423                 urb->iso_frame_desc[k].length = packet_size;
 424                 urb->iso_frame_desc[k].actual_length = 0;
 425         }
 426 }
 427
 428 int
 429 st5481_setup_isocpipes(struct urb *urb[2], struct usb_device *dev,
 430                        unsigned int pipe, int num_packets,
 431                        int packet_size, int buf_size,
 432                        usb_complete_t complete, void *context)
 433 {
 434         int j, retval;
 435         unsigned char *buf;
 436
 437         for (j = 0; j < 2; j++) {
 438                 retval = -ENOMEM;
 439                 urb[j] = usb_alloc_urb(num_packets, GFP_KERNEL);
 440                 if (!urb[j])
 441                         goto err;
 442
 443                 // Allocate memory for 2000bytes/sec (16Kb/s)
 444                 buf = kmalloc(buf_size, GFP_KERNEL);
 445                 if (!buf)
 446                         goto err;
 447
 448                 // Fill the isochronous URB
 449                 fill_isoc_urb(urb[j], dev, pipe, buf,
 450                               num_packets, packet_size, complete,
 451                               context);
 452         }
 453         return 0;
 454
 455 err:
 456         for (j = 0; j < 2; j++) {
 457                 if (urb[j]) {
 458                         kfree(urb[j]->transfer_buffer);
 459                         urb[j]->transfer_buffer = NULL;
 460                         usb_free_urb(urb[j]);
 461                         urb[j] = NULL;
 462                 }
 463         }
 464         return retval;
 465 }
 466
 467 void st5481_release_isocpipes(struct urb *urb[2])
 468 {
 469         int j;
 470
 471         for (j = 0; j < 2; j++) {
 472                 usb_kill_urb(urb[j]);
 473                 kfree(urb[j]->transfer_buffer);
 474                 usb_free_urb(urb[j]);
 475                 urb[j] = NULL;
 476         }
 477 }
 478
 479 /*
 480  * Decode frames received on the B/D channel.
 481  * Note that this function will be called continuously
 482  * with 64Kbit/s / 16Kbit/s of data and hence it will be
 483  * called 50 times per second with 20 ISOC descriptors.
 484  * Called at interrupt.
 485  */
 486 static void usb_in_complete(struct urb *urb)
 487 {
 488         struct st5481_in *in = urb->context;
 489         unsigned char *ptr;
 490         struct sk_buff *skb;
 491         int len, count, status;
 492
 493         if (unlikely(urb->status < 0)) {
 494                 switch (urb->status) {
 495                 case -ENOENT:
 496                 case -ESHUTDOWN:
 497                 case -ECONNRESET:
 498                         DBG(1, "urb killed status %d", urb->status);
 499                         return; // Give up
 500                 default:
 501                         WARNING("urb status %d", urb->status);
 502                         break;
 503                 }
 504         }
 505
 506         DBG_ISO_PACKET(0x80, urb);
 507
 508         len = st5481_isoc_flatten(urb);
 509         ptr = urb->transfer_buffer;
 510         while (len > 0) {
 511                 if (in->mode == L1_MODE_TRANS) {
 512                         memcpy(in->rcvbuf, ptr, len);
 513                         status = len;
 514                         len = 0;
 515                 } else {
 516                         status = isdnhdlc_decode(&in->hdlc_state, ptr, len, &count,
 517                                                  in->rcvbuf, in->bufsize);
 518                         ptr += count;
 519                         len -= count;
 520                 }
 521
 522                 if (status > 0) {
 523                         // Good frame received
 524                         DBG(4, "count=%d", status);
 525                         DBG_PACKET(0x400, in->rcvbuf, status);
 526                         if (!(skb = dev_alloc_skb(status))) {
 527                                 WARNING("receive out of memory\n");
 528                                 break;
 529                         }
 530                         skb_put_data(skb, in->rcvbuf, status);
 531                         in->hisax_if->l1l2(in->hisax_if, PH_DATA | INDICATION, skb);
 532                 } else if (status == -HDLC_CRC_ERROR) {
 533                         INFO("CRC error");
 534                 } else if (status == -HDLC_FRAMING_ERROR) {
 535                         INFO("framing error");
 536                 } else if (status == -HDLC_LENGTH_ERROR) {
 537                         INFO("length error");
 538                 }
 539         }
 540
 541         // Prepare URB for next transfer
 542         urb->dev = in->adapter->usb_dev;
 543         urb->actual_length = 0;
 544
 545         SUBMIT_URB(urb, GFP_ATOMIC);
 546 }
 547
 548 int st5481_setup_in(struct st5481_in *in)
 549 {
 550         struct usb_device *dev = in->adapter->usb_dev;
 551         int retval;
 552
 553         DBG(4, "");
 554
 555         in->rcvbuf = kmalloc(in->bufsize, GFP_KERNEL);
 556         retval = -ENOMEM;
 557         if (!in->rcvbuf)
 558                 goto err;
 559
 560         retval = st5481_setup_isocpipes(in->urb, dev,
 561                                         usb_rcvisocpipe(dev, in->ep),
 562                                         in->num_packets,  in->packet_size,
 563                                         in->num_packets * in->packet_size,
 564                                         usb_in_complete, in);
 565         if (retval)
 566                 goto err_free;
 567         return 0;
 568
 569 err_free:
 570         kfree(in->rcvbuf);
 571 err:
 572         return retval;
 573 }
 574
 575 void st5481_release_in(struct st5481_in *in)
 576 {
 577         DBG(2, "");
 578
 579         st5481_release_isocpipes(in->urb);
 580 }
 581
 582 /*
 583  * Make the transfer_buffer contiguous by
 584  * copying from the iso descriptors if necessary.
 585  */
 586 static int st5481_isoc_flatten(struct urb *urb)
 587 {
 588         struct usb_iso_packet_descriptor *pipd, *pend;
 589         unsigned char *src, *dst;
 590         unsigned int len;
 591
 592         if (urb->status < 0) {
 593                 return urb->status;
 594         }
 595         for (pipd = &urb->iso_frame_desc[0],
 596                      pend = &urb->iso_frame_desc[urb->number_of_packets],
 597                      dst = urb->transfer_buffer;
 598              pipd < pend;
 599              pipd++) {
 600
 601                 if (pipd->status < 0) {
 602                         return (pipd->status);
 603                 }
 604
 605                 len = pipd->actual_length;
 606                 pipd->actual_length = 0;
 607                 src = urb->transfer_buffer + pipd->offset;
 608
 609                 if (src != dst) {
 610                         // Need to copy since isoc buffers not full
 611                         while (len--) {
 612                                 *dst++ = *src++;
 613                         }
 614                 } else {
 615                         // No need to copy, just update destination buffer
 616                         dst += len;
 617                 }
 618         }
 619         // Return size of flattened buffer
 620         return (dst - (unsigned char *)urb->transfer_buffer);
 621 }
 622
 623 static void st5481_start_rcv(void *context)
 624 {
 625         struct st5481_in *in = context;
 626         struct st5481_adapter *adapter = in->adapter;
 627
 628         DBG(4, "");
 629
 630         in->urb[0]->dev = adapter->usb_dev;
 631         SUBMIT_URB(in->urb[0], GFP_KERNEL);
 632
 633         in->urb[1]->dev = adapter->usb_dev;
 634         SUBMIT_URB(in->urb[1], GFP_KERNEL);
 635 }
 636
 637 void st5481_in_mode(struct st5481_in *in, int mode)
 638 {
 639         if (in->mode == mode)
 640                 return;
 641
 642         in->mode = mode;
 643
 644         usb_unlink_urb(in->urb[0]);
 645         usb_unlink_urb(in->urb[1]);
 646
 647         if (in->mode != L1_MODE_NULL) {
 648                 if (in->mode != L1_MODE_TRANS) {
 649                         u32 features = HDLC_BITREVERSE;
 650
 651                         if (in->mode == L1_MODE_HDLC_56K)
 652                                 features |= HDLC_56KBIT;
 653                         isdnhdlc_rcv_init(&in->hdlc_state, features);
 654                 }
 655                 st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
 656                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 657                                            in->packet_size,
 658                                            NULL, NULL);
 659                 st5481_start_rcv(in);
 660         } else {
 661                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 662                                            0, NULL, NULL);
 663         }
 664 }