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