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                 WARN("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                                 WARN("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
 153                 /* toggle is reset on clear */
 154                 usb_settoggle(adapter->usb_dev,
 155                               ctrl_msg->dr.wIndex & ~USB_DIR_IN,
 156                               (ctrl_msg->dr.wIndex & USB_DIR_IN) == 0,
 157                               0);
 158
 159
 160         }
 161
 162         if (ctrl_msg->complete)
 163                 ctrl_msg->complete(ctrl_msg->context);
 164
 165         clear_bit(0, &ctrl->busy);
 166
 167         // Try to send next control message
 168         usb_next_ctrl_msg(urb, adapter);
 169         return;
 170 }
 171
 172 /* ======================================================================
 173  * interrupt pipe
 174  */
 175
 176 /*
 177  * The interrupt endpoint will be called when any
 178  * of the 6 registers changes state (depending on masks).
 179  * Decode the register values and schedule a private event.
 180  * Called at interrupt.
 181  */
 182 static void usb_int_complete(struct urb *urb)
 183 {
 184         u8 *data = urb->transfer_buffer;
 185         u8 irqbyte;
 186         struct st5481_adapter *adapter = urb->context;
 187         int j;
 188         int status;
 189
 190         switch (urb->status) {
 191                 case 0:
 192                         /* success */
 193                         break;
 194                 case -ECONNRESET:
 195                 case -ENOENT:
 196                 case -ESHUTDOWN:
 197                         /* this urb is terminated, clean up */
 198                         DBG(2, "urb shutting down with status: %d", urb->status);
 199                         return;
 200                 default:
 201                         WARN("nonzero urb status received: %d", urb->status);
 202                         goto exit;
 203         }
 204
 205
 206         DBG_PACKET(2, data, INT_PKT_SIZE);
 207
 208         if (urb->actual_length == 0) {
 209                 goto exit;
 210         }
 211
 212         irqbyte = data[MPINT];
 213         if (irqbyte & DEN_INT)
 214                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_DEN, NULL);
 215
 216         if (irqbyte & DCOLL_INT)
 217                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_COLL, NULL);
 218
 219         irqbyte = data[FFINT_D];
 220         if (irqbyte & OUT_UNDERRUN)
 221                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_UNDERRUN, NULL);
 222
 223         if (irqbyte & OUT_DOWN)
 224 ;//             printk("OUT_DOWN\n");
 225
 226         irqbyte = data[MPINT];
 227         if (irqbyte & RXCI_INT)
 228                 FsmEvent(&adapter->l1m, data[CCIST] & 0x0f, NULL);
 229
 230         for (j = 0; j < 2; j++)
 231                 adapter->bcs[j].b_out.flow_event |= data[FFINT_B1 + j];
 232
 233         urb->actual_length = 0;
 234
 235 exit:
 236         status = usb_submit_urb (urb, GFP_ATOMIC);
 237         if (status)
 238                 WARN("usb_submit_urb failed with result %d", status);
 239 }
 240
 241 /* ======================================================================
 242  * initialization
 243  */
 244
 245 int st5481_setup_usb(struct st5481_adapter *adapter)
 246 {
 247         struct usb_device *dev = adapter->usb_dev;
 248         struct st5481_ctrl *ctrl = &adapter->ctrl;
 249         struct st5481_intr *intr = &adapter->intr;
 250         struct usb_interface *intf;
 251         struct usb_host_interface *altsetting = NULL;
 252         struct usb_host_endpoint *endpoint;
 253         int status;
 254         struct urb *urb;
 255         u8 *buf;
 256
 257         DBG(2,"");
 258
 259         if ((status = usb_reset_configuration (dev)) < 0) {
 260                 WARN("reset_configuration failed,status=%d",status);
 261                 return status;
 262         }
 263
 264         intf = usb_ifnum_to_if(dev, 0);
 265         if (intf)
 266                 altsetting = usb_altnum_to_altsetting(intf, 3);
 267         if (!altsetting)
 268                 return -ENXIO;
 269
 270         // Check if the config is sane
 271         if ( altsetting->desc.bNumEndpoints != 7 ) {
 272                 WARN("expecting 7 got %d endpoints!", altsetting->desc.bNumEndpoints);
 273                 return -EINVAL;
 274         }
 275
 276         // The descriptor is wrong for some early samples of the ST5481 chip
 277         altsetting->endpoint[3].desc.wMaxPacketSize = __constant_cpu_to_le16(32);
 278         altsetting->endpoint[4].desc.wMaxPacketSize = __constant_cpu_to_le16(32);
 279
 280         // Use alternative setting 3 on interface 0 to have 2B+D
 281         if ((status = usb_set_interface (dev, 0, 3)) < 0) {
 282                 WARN("usb_set_interface failed,status=%d",status);
 283                 return status;
 284         }
 285
 286         // Allocate URB for control endpoint
 287         urb = usb_alloc_urb(0, GFP_KERNEL);
 288         if (!urb) {
 289                 return -ENOMEM;
 290         }
 291         ctrl->urb = urb;
 292
 293         // Fill the control URB
 294         usb_fill_control_urb (urb, dev,
 295                           usb_sndctrlpipe(dev, 0),
 296                           NULL, NULL, 0, usb_ctrl_complete, adapter);
 297
 298
 299         fifo_init(&ctrl->msg_fifo.f, ARRAY_SIZE(ctrl->msg_fifo.data));
 300
 301         // Allocate URBs and buffers for interrupt endpoint
 302         urb = usb_alloc_urb(0, GFP_KERNEL);
 303         if (!urb) {
 304                 return -ENOMEM;
 305         }
 306         intr->urb = urb;
 307
 308         buf = kmalloc(INT_PKT_SIZE, GFP_KERNEL);
 309         if (!buf) {
 310                 return -ENOMEM;
 311         }
 312
 313         endpoint = &altsetting->endpoint[EP_INT-1];
 314
 315         // Fill the interrupt URB
 316         usb_fill_int_urb(urb, dev,
 317                      usb_rcvintpipe(dev, endpoint->desc.bEndpointAddress),
 318                      buf, INT_PKT_SIZE,
 319                      usb_int_complete, adapter,
 320                      endpoint->desc.bInterval);
 321
 322         return 0;
 323 }
 324
 325 /*
 326  * Release buffers and URBs for the interrupt and control
 327  * endpoint.
 328  */
 329 void st5481_release_usb(struct st5481_adapter *adapter)
 330 {
 331         struct st5481_intr *intr = &adapter->intr;
 332         struct st5481_ctrl *ctrl = &adapter->ctrl;
 333
 334         DBG(1,"");
 335
 336         // Stop and free Control and Interrupt URBs
 337         usb_kill_urb(ctrl->urb);
 338         kfree(ctrl->urb->transfer_buffer);
 339         usb_free_urb(ctrl->urb);
 340         ctrl->urb = NULL;
 341
 342         usb_kill_urb(intr->urb);
 343         kfree(intr->urb->transfer_buffer);
 344         usb_free_urb(intr->urb);
 345         intr->urb = NULL;
 346 }
 347
 348 /*
 349  *  Initialize the adapter.
 350  */
 351 void st5481_start(struct st5481_adapter *adapter)
 352 {
 353         static const u8 init_cmd_table[]={
 354                 SET_DEFAULT,0,
 355                 STT,0,
 356                 SDA_MIN,0x0d,
 357                 SDA_MAX,0x29,
 358                 SDELAY_VALUE,0x14,
 359                 GPIO_DIR,0x01,
 360                 GPIO_OUT,RED_LED,
 361 //              FFCTRL_OUT_D,4,
 362 //              FFCTRH_OUT_D,12,
 363                 FFCTRL_OUT_B1,6,
 364                 FFCTRH_OUT_B1,20,
 365                 FFCTRL_OUT_B2,6,
 366                 FFCTRH_OUT_B2,20,
 367                 MPMSK,RXCI_INT+DEN_INT+DCOLL_INT,
 368                 0
 369         };
 370         struct st5481_intr *intr = &adapter->intr;
 371         int i = 0;
 372         u8 request,value;
 373
 374         DBG(8,"");
 375
 376         adapter->leds = RED_LED;
 377
 378         // Start receiving on the interrupt endpoint
 379         SUBMIT_URB(intr->urb, GFP_KERNEL);
 380
 381         while ((request = init_cmd_table[i++])) {
 382                 value = init_cmd_table[i++];
 383                 st5481_usb_device_ctrl_msg(adapter, request, value, NULL, NULL);
 384         }
 385         st5481_ph_command(adapter, ST5481_CMD_PUP);
 386 }
 387
 388 /*
 389  * Reset the adapter to default values.
 390  */
 391 void st5481_stop(struct st5481_adapter *adapter)
 392 {
 393         DBG(8,"");
 394
 395         st5481_usb_device_ctrl_msg(adapter, SET_DEFAULT, 0, NULL, NULL);
 396 }
 397
 398 /* ======================================================================
 399  * isochronous USB  helpers
 400  */
 401
 402 static void
 403 fill_isoc_urb(struct urb *urb, struct usb_device *dev,
 404               unsigned int pipe, void *buf, int num_packets,
 405               int packet_size, usb_complete_t complete,
 406               void *context)
 407 {
 408         int k;
 409
 410         urb->dev=dev;
 411         urb->pipe=pipe;
 412         urb->interval = 1;
 413         urb->transfer_buffer=buf;
 414         urb->number_of_packets = num_packets;
 415         urb->transfer_buffer_length=num_packets*packet_size;
 416         urb->actual_length = 0;
 417         urb->complete=complete;
 418         urb->context=context;
 419         urb->transfer_flags=URB_ISO_ASAP;
 420         for (k = 0; k < num_packets; k++) {
 421                 urb->iso_frame_desc[k].offset = packet_size * k;
 422                 urb->iso_frame_desc[k].length = packet_size;
 423                 urb->iso_frame_desc[k].actual_length = 0;
 424         }
 425 }
 426
 427 int
 428 st5481_setup_isocpipes(struct urb* urb[2], struct usb_device *dev,
 429                            unsigned int pipe, int num_packets,
 430                            int packet_size, int buf_size,
 431                            usb_complete_t complete, void *context)
 432 {
 433         int j, retval;
 434         unsigned char *buf;
 435
 436         for (j = 0; j < 2; j++) {
 437                 retval = -ENOMEM;
 438                 urb[j] = usb_alloc_urb(num_packets, GFP_KERNEL);
 439                 if (!urb[j])
 440                         goto err;
 441
 442                 // Allocate memory for 2000bytes/sec (16Kb/s)
 443                 buf = kmalloc(buf_size, GFP_KERNEL);
 444                 if (!buf)
 445                         goto err;
 446
 447                 // Fill the isochronous URB
 448                 fill_isoc_urb(urb[j], dev, pipe, buf,
 449                               num_packets, packet_size, complete,
 450                               context);
 451         }
 452         return 0;
 453
 454  err:
 455         for (j = 0; j < 2; j++) {
 456                 if (urb[j]) {
 457                         kfree(urb[j]->transfer_buffer);
 458                         urb[j]->transfer_buffer = NULL;
 459                         usb_free_urb(urb[j]);
 460                         urb[j] = NULL;
 461                 }
 462         }
 463         return retval;
 464 }
 465
 466 void st5481_release_isocpipes(struct urb* urb[2])
 467 {
 468         int j;
 469
 470         for (j = 0; j < 2; j++) {
 471                 usb_kill_urb(urb[j]);
 472                 kfree(urb[j]->transfer_buffer);
 473                 usb_free_urb(urb[j]);
 474                 urb[j] = NULL;
 475         }
 476 }
 477
 478 /*
 479  * Decode frames received on the B/D channel.
 480  * Note that this function will be called continously
 481  * with 64Kbit/s / 16Kbit/s of data and hence it will be
 482  * called 50 times per second with 20 ISOC descriptors.
 483  * Called at interrupt.
 484  */
 485 static void usb_in_complete(struct urb *urb)
 486 {
 487         struct st5481_in *in = urb->context;
 488         unsigned char *ptr;
 489         struct sk_buff *skb;
 490         int len, count, status;
 491
 492         if (unlikely(urb->status < 0)) {
 493                 switch (urb->status) {
 494                         case -ENOENT:
 495                         case -ESHUTDOWN:
 496                         case -ECONNRESET:
 497                                 DBG(1,"urb killed status %d", urb->status);
 498                                 return; // Give up
 499                         default:
 500                                 WARN("urb status %d",urb->status);
 501                                 break;
 502                 }
 503         }
 504
 505         DBG_ISO_PACKET(0x80,urb);
 506
 507         len = st5481_isoc_flatten(urb);
 508         ptr = urb->transfer_buffer;
 509         while (len > 0) {
 510                 if (in->mode == L1_MODE_TRANS) {
 511                         memcpy(in->rcvbuf, ptr, len);
 512                         status = len;
 513                         len = 0;
 514                 } else {
 515                         status = isdnhdlc_decode(&in->hdlc_state, ptr, len, &count,
 516                                 in->rcvbuf, in->bufsize);
 517                         ptr += count;
 518                         len -= count;
 519                 }
 520
 521                 if (status > 0) {
 522                         // Good frame received
 523                         DBG(4,"count=%d",status);
 524                         DBG_PACKET(0x400, in->rcvbuf, status);
 525                         if (!(skb = dev_alloc_skb(status))) {
 526                                 WARN("receive out of memory\n");
 527                                 break;
 528                         }
 529                         memcpy(skb_put(skb, status), in->rcvbuf, status);
 530                         in->hisax_if->l1l2(in->hisax_if, PH_DATA | INDICATION, skb);
 531                 } else if (status == -HDLC_CRC_ERROR) {
 532                         INFO("CRC error");
 533                 } else if (status == -HDLC_FRAMING_ERROR) {
 534                         INFO("framing error");
 535                 } else if (status == -HDLC_LENGTH_ERROR) {
 536                         INFO("length error");
 537                 }
 538         }
 539
 540         // Prepare URB for next transfer
 541         urb->dev = in->adapter->usb_dev;
 542         urb->actual_length = 0;
 543
 544         SUBMIT_URB(urb, GFP_ATOMIC);
 545 }
 546
 547 int st5481_setup_in(struct st5481_in *in)
 548 {
 549         struct usb_device *dev = in->adapter->usb_dev;
 550         int retval;
 551
 552         DBG(4,"");
 553
 554         in->rcvbuf = kmalloc(in->bufsize, GFP_KERNEL);
 555         retval = -ENOMEM;
 556         if (!in->rcvbuf)
 557                 goto err;
 558
 559         retval = st5481_setup_isocpipes(in->urb, dev,
 560                                         usb_rcvisocpipe(dev, in->ep),
 561                                         in->num_packets,  in->packet_size,
 562                                         in->num_packets * in->packet_size,
 563                                         usb_in_complete, in);
 564         if (retval)
 565                 goto err_free;
 566         return 0;
 567
 568  err_free:
 569         kfree(in->rcvbuf);
 570  err:
 571         return retval;
 572 }
 573
 574 void st5481_release_in(struct st5481_in *in)
 575 {
 576         DBG(2,"");
 577
 578         st5481_release_isocpipes(in->urb);
 579 }
 580
 581 /*
 582  * Make the transfer_buffer contiguous by
 583  * copying from the iso descriptors if necessary.
 584  */
 585 static int st5481_isoc_flatten(struct urb *urb)
 586 {
 587         struct usb_iso_packet_descriptor *pipd,*pend;
 588         unsigned char *src,*dst;
 589         unsigned int len;
 590
 591         if (urb->status < 0) {
 592                 return urb->status;
 593         }
 594         for (pipd = &urb->iso_frame_desc[0],
 595                      pend = &urb->iso_frame_desc[urb->number_of_packets],
 596                      dst = urb->transfer_buffer;
 597              pipd < pend;
 598              pipd++) {
 599
 600                 if (pipd->status < 0) {
 601                         return (pipd->status);
 602                 }
 603
 604                 len = pipd->actual_length;
 605                 pipd->actual_length = 0;
 606                 src = urb->transfer_buffer+pipd->offset;
 607
 608                 if (src != dst) {
 609                         // Need to copy since isoc buffers not full
 610                         while (len--) {
 611                                 *dst++ = *src++;
 612                         }
 613                 } else {
 614                         // No need to copy, just update destination buffer
 615                         dst += len;
 616                 }
 617         }
 618         // Return size of flattened buffer
 619         return (dst - (unsigned char *)urb->transfer_buffer);
 620 }
 621
 622 static void st5481_start_rcv(void *context)
 623 {
 624         struct st5481_in *in = context;
 625         struct st5481_adapter *adapter = in->adapter;
 626
 627         DBG(4,"");
 628
 629         in->urb[0]->dev = adapter->usb_dev;
 630         SUBMIT_URB(in->urb[0], GFP_KERNEL);
 631
 632         in->urb[1]->dev = adapter->usb_dev;
 633         SUBMIT_URB(in->urb[1], GFP_KERNEL);
 634 }
 635
 636 void st5481_in_mode(struct st5481_in *in, int mode)
 637 {
 638         if (in->mode == mode)
 639                 return;
 640
 641         in->mode = mode;
 642
 643         usb_unlink_urb(in->urb[0]);
 644         usb_unlink_urb(in->urb[1]);
 645
 646         if (in->mode != L1_MODE_NULL) {
 647                 if (in->mode != L1_MODE_TRANS)
 648                         isdnhdlc_rcv_init(&in->hdlc_state,
 649                                 in->mode == L1_MODE_HDLC_56K);
 650
 651                 st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
 652                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 653                                            in->packet_size,
 654                                            NULL, NULL);
 655                 st5481_start_rcv(in);
 656         } else {
 657                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 658                                            0, NULL, NULL);
 659         }
 660 }
 661