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, struct pt_regs *regs)
 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                 if (urb->status != -ENOENT && urb->status != -ESHUTDOWN) {
 136                         WARN("urb status %d",urb->status);
 137                 } else {
 138                         DBG(1,"urb killed");
 139                         return; // Give up
 140                 }
 141         }
 142
 143         ctrl_msg = (struct ctrl_msg *)urb->setup_packet;
 144
 145         if (ctrl_msg->dr.bRequest == USB_REQ_CLEAR_FEATURE) {
 146                 /* Special case handling for pipe reset */
 147                 le16_to_cpus(&ctrl_msg->dr.wIndex);
 148
 149                 /* toggle is reset on clear */
 150                 usb_settoggle(adapter->usb_dev,
 151                               ctrl_msg->dr.wIndex & ~USB_DIR_IN,
 152                               (ctrl_msg->dr.wIndex & USB_DIR_IN) == 0,
 153                               0);
 154
 155
 156         }
 157
 158         if (ctrl_msg->complete)
 159                 ctrl_msg->complete(ctrl_msg->context);
 160
 161         clear_bit(0, &ctrl->busy);
 162
 163         // Try to send next control message
 164         usb_next_ctrl_msg(urb, adapter);
 165         return;
 166 }
 167
 168 /* ======================================================================
 169  * interrupt pipe
 170  */
 171
 172 /*
 173  * The interrupt endpoint will be called when any
 174  * of the 6 registers changes state (depending on masks).
 175  * Decode the register values and schedule a private event.
 176  * Called at interrupt.
 177  */
 178 static void usb_int_complete(struct urb *urb, struct pt_regs *regs)
 179 {
 180         u8 *data = urb->transfer_buffer;
 181         u8 irqbyte;
 182         struct st5481_adapter *adapter = urb->context;
 183         int j;
 184         int status;
 185
 186         switch (urb->status) {
 187         case 0:
 188                 /* success */
 189                 break;
 190         case -ECONNRESET:
 191         case -ENOENT:
 192         case -ESHUTDOWN:
 193                 /* this urb is terminated, clean up */
 194                 DBG(1, "urb shutting down with status: %d", urb->status);
 195                 return;
 196         default:
 197                 WARN("nonzero urb status received: %d", urb->status);
 198                 goto exit;
 199         }
 200
 201
 202         DBG_PACKET(1, data, INT_PKT_SIZE);
 203
 204         if (urb->actual_length == 0) {
 205                 goto exit;
 206         }
 207
 208         irqbyte = data[MPINT];
 209         if (irqbyte & DEN_INT)
 210                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_DEN, NULL);
 211
 212         if (irqbyte & DCOLL_INT)
 213                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_COLL, NULL);
 214
 215         irqbyte = data[FFINT_D];
 216         if (irqbyte & OUT_UNDERRUN)
 217                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_UNDERRUN, NULL);
 218
 219         if (irqbyte & OUT_DOWN)
 220 ;//             printk("OUT_DOWN\n");
 221
 222         irqbyte = data[MPINT];
 223         if (irqbyte & RXCI_INT)
 224                 FsmEvent(&adapter->l1m, data[CCIST] & 0x0f, NULL);
 225
 226         for (j = 0; j < 2; j++)
 227                 adapter->bcs[j].b_out.flow_event |= data[FFINT_B1 + j];
 228
 229         urb->actual_length = 0;
 230
 231 exit:
 232         status = usb_submit_urb (urb, GFP_ATOMIC);
 233         if (status)
 234                 WARN("usb_submit_urb failed with result %d", status);
 235 }
 236
 237 /* ======================================================================
 238  * initialization
 239  */
 240
 241 int st5481_setup_usb(struct st5481_adapter *adapter)
 242 {
 243         struct usb_device *dev = adapter->usb_dev;
 244         struct st5481_ctrl *ctrl = &adapter->ctrl;
 245         struct st5481_intr *intr = &adapter->intr;
 246         struct usb_interface *intf;
 247         struct usb_host_interface *altsetting = NULL;
 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         intf = usb_ifnum_to_if(dev, 0);
 261         if (intf)
 262                 altsetting = usb_altnum_to_altsetting(intf, 3);
 263         if (!altsetting)
 264                 return -ENXIO;
 265
 266         // Check if the config is sane
 267         if ( altsetting->desc.bNumEndpoints != 7 ) {
 268                 WARN("expecting 7 got %d endpoints!", altsetting->desc.bNumEndpoints);
 269                 return -EINVAL;
 270         }
 271
 272         // The descriptor is wrong for some early samples of the ST5481 chip
 273         altsetting->endpoint[3].desc.wMaxPacketSize = __constant_cpu_to_le16(32);
 274         altsetting->endpoint[4].desc.wMaxPacketSize = __constant_cpu_to_le16(32);
 275
 276         // Use alternative setting 3 on interface 0 to have 2B+D
 277         if ((status = usb_set_interface (dev, 0, 3)) < 0) {
 278                 WARN("usb_set_interface failed,status=%d",status);
 279                 return status;
 280         }
 281
 282         // Allocate URB for control endpoint
 283         urb = usb_alloc_urb(0, GFP_KERNEL);
 284         if (!urb) {
 285                 return -ENOMEM;
 286         }
 287         ctrl->urb = urb;
 288
 289         // Fill the control URB
 290         usb_fill_control_urb (urb, dev,
 291                           usb_sndctrlpipe(dev, 0),
 292                           NULL, NULL, 0, usb_ctrl_complete, adapter);
 293
 294
 295         fifo_init(&ctrl->msg_fifo.f, ARRAY_SIZE(ctrl->msg_fifo.data));
 296
 297         // Allocate URBs and buffers for interrupt endpoint
 298         urb = usb_alloc_urb(0, GFP_KERNEL);
 299         if (!urb) {
 300                 return -ENOMEM;
 301         }
 302         intr->urb = urb;
 303
 304         buf = kmalloc(INT_PKT_SIZE, GFP_KERNEL);
 305         if (!buf) {
 306                 return -ENOMEM;
 307         }
 308
 309         endpoint = &altsetting->endpoint[EP_INT-1];
 310
 311         // Fill the interrupt URB
 312         usb_fill_int_urb(urb, dev,
 313                      usb_rcvintpipe(dev, endpoint->desc.bEndpointAddress),
 314                      buf, INT_PKT_SIZE,
 315                      usb_int_complete, adapter,
 316                      endpoint->desc.bInterval);
 317
 318         return 0;
 319 }
 320
 321 /*
 322  * Release buffers and URBs for the interrupt and control
 323  * endpoint.
 324  */
 325 void st5481_release_usb(struct st5481_adapter *adapter)
 326 {
 327         struct st5481_intr *intr = &adapter->intr;
 328         struct st5481_ctrl *ctrl = &adapter->ctrl;
 329
 330         DBG(1,"");
 331
 332         // Stop and free Control and Interrupt URBs
 333         usb_unlink_urb(ctrl->urb);
 334         if (ctrl->urb->transfer_buffer)
 335                 kfree(ctrl->urb->transfer_buffer);
 336         usb_free_urb(ctrl->urb);
 337
 338         usb_unlink_urb(intr->urb);
 339         if (intr->urb->transfer_buffer)
 340                 kfree(intr->urb->transfer_buffer);
 341         usb_free_urb(intr->urb);
 342 }
 343
 344 /*
 345  *  Initialize the adapter.
 346  */
 347 void st5481_start(struct st5481_adapter *adapter)
 348 {
 349         static const u8 init_cmd_table[]={
 350                 SET_DEFAULT,0,
 351                 STT,0,
 352                 SDA_MIN,0x0d,
 353                 SDA_MAX,0x29,
 354                 SDELAY_VALUE,0x14,
 355                 GPIO_DIR,0x01,
 356                 GPIO_OUT,RED_LED,
 357 //              FFCTRL_OUT_D,4,
 358 //              FFCTRH_OUT_D,12,
 359                 FFCTRL_OUT_B1,6,
 360                 FFCTRH_OUT_B1,20,
 361                 FFCTRL_OUT_B2,6,
 362                 FFCTRH_OUT_B2,20,
 363                 MPMSK,RXCI_INT+DEN_INT+DCOLL_INT,
 364                 0
 365         };
 366         struct st5481_intr *intr = &adapter->intr;
 367         int i = 0;
 368         u8 request,value;
 369
 370         DBG(8,"");
 371
 372         adapter->leds = RED_LED;
 373
 374         // Start receiving on the interrupt endpoint
 375         SUBMIT_URB(intr->urb, GFP_KERNEL);
 376
 377         while ((request = init_cmd_table[i++])) {
 378                 value = init_cmd_table[i++];
 379                 st5481_usb_device_ctrl_msg(adapter, request, value, NULL, NULL);
 380         }
 381         st5481_ph_command(adapter, ST5481_CMD_PUP);
 382 }
 383
 384 /*
 385  * Reset the adapter to default values.
 386  */
 387 void st5481_stop(struct st5481_adapter *adapter)
 388 {
 389         DBG(8,"");
 390
 391         st5481_usb_device_ctrl_msg(adapter, SET_DEFAULT, 0, NULL, NULL);
 392 }
 393
 394 /* ======================================================================
 395  * isochronous USB  helpers
 396  */
 397
 398 static void
 399 fill_isoc_urb(struct urb *urb, struct usb_device *dev,
 400               unsigned int pipe, void *buf, int num_packets,
 401               int packet_size, usb_complete_t complete,
 402               void *context)
 403 {
 404         int k;
 405
 406         spin_lock_init(&urb->lock);
 407         urb->dev=dev;
 408         urb->pipe=pipe;
 409         urb->transfer_buffer=buf;
 410         urb->number_of_packets = num_packets;
 411         urb->transfer_buffer_length=num_packets*packet_size;
 412         urb->actual_length = 0;
 413         urb->complete=complete;
 414         urb->context=context;
 415         urb->transfer_flags=URB_ISO_ASAP;
 416         for (k = 0; k < num_packets; k++) {
 417                 urb->iso_frame_desc[k].offset = packet_size * k;
 418                 urb->iso_frame_desc[k].length = packet_size;
 419                 urb->iso_frame_desc[k].actual_length = 0;
 420         }
 421 }
 422
 423 int
 424 st5481_setup_isocpipes(struct urb* urb[2], struct usb_device *dev,
 425                            unsigned int pipe, int num_packets,
 426                            int packet_size, int buf_size,
 427                            usb_complete_t complete, void *context)
 428 {
 429         int j, retval;
 430         unsigned char *buf;
 431
 432         for (j = 0; j < 2; j++) {
 433                 retval = -ENOMEM;
 434                 urb[j] = usb_alloc_urb(num_packets, GFP_KERNEL);
 435                 if (!urb[j])
 436                         goto err;
 437
 438                 // Allocate memory for 2000bytes/sec (16Kb/s)
 439                 buf = kmalloc(buf_size, GFP_KERNEL);
 440                 if (!buf)
 441                         goto err;
 442
 443                 // Fill the isochronous URB
 444                 fill_isoc_urb(urb[j], dev, pipe, buf,
 445                               num_packets, packet_size, complete,
 446                               context);
 447         }
 448         return 0;
 449
 450  err:
 451         for (j = 0; j < 2; j++) {
 452                 if (urb[j]) {
 453                         if (urb[j]->transfer_buffer)
 454                                 kfree(urb[j]->transfer_buffer);
 455                         usb_free_urb(urb[j]);
 456                 }
 457         }
 458         return retval;
 459 }
 460
 461 void st5481_release_isocpipes(struct urb* urb[2])
 462 {
 463         int j;
 464
 465         for (j = 0; j < 2; j++) {
 466                 usb_unlink_urb(urb[j]);
 467                 if (urb[j]->transfer_buffer)
 468                         kfree(urb[j]->transfer_buffer);
 469                 usb_free_urb(urb[j]);
 470         }
 471 }
 472
 473 /*
 474  * Decode frames received on the B/D channel.
 475  * Note that this function will be called continously
 476  * with 64Kbit/s / 16Kbit/s of data and hence it will be
 477  * called 50 times per second with 20 ISOC descriptors.
 478  * Called at interrupt.
 479  */
 480 static void usb_in_complete(struct urb *urb, struct pt_regs *regs)
 481 {
 482         struct st5481_in *in = urb->context;
 483         unsigned char *ptr;
 484         struct sk_buff *skb;
 485         int len, count, status;
 486
 487         if (unlikely(urb->status < 0)) {
 488                 if (urb->status != -ENOENT && urb->status != -ESHUTDOWN) {
 489                         WARN("urb status %d",urb->status);
 490                 } else {
 491                         DBG(1,"urb killed");
 492                         return; // Give up
 493                 }
 494         }
 495
 496         DBG_ISO_PACKET(0x80,urb);
 497
 498         len = st5481_isoc_flatten(urb);
 499         ptr = urb->transfer_buffer;
 500         while (len > 0) {
 501                 if (in->mode == L1_MODE_TRANS) {
 502                         memcpy(in->rcvbuf, ptr, len);
 503                         status = len;
 504                         len = 0;
 505                 } else {
 506                         status = isdnhdlc_decode(&in->hdlc_state, ptr, len, &count,
 507                                 in->rcvbuf, in->bufsize);
 508                         ptr += count;
 509                         len -= count;
 510                 }
 511
 512                 if (status > 0) {
 513                         // Good frame received
 514                         DBG(4,"count=%d",status);
 515                         DBG_PACKET(0x400, in->rcvbuf, status);
 516                         if (!(skb = dev_alloc_skb(status))) {
 517                                 WARN("receive out of memory\n");
 518                                 break;
 519                         }
 520                         memcpy(skb_put(skb, status), in->rcvbuf, status);
 521                         in->hisax_if->l1l2(in->hisax_if, PH_DATA | INDICATION, skb);
 522                 } else if (status == -HDLC_CRC_ERROR) {
 523                         INFO("CRC error");
 524                 } else if (status == -HDLC_FRAMING_ERROR) {
 525                         INFO("framing error");
 526                 } else if (status == -HDLC_LENGTH_ERROR) {
 527                         INFO("length error");
 528                 }
 529         }
 530
 531         // Prepare URB for next transfer
 532         urb->dev = in->adapter->usb_dev;
 533         urb->actual_length = 0;
 534
 535         SUBMIT_URB(urb, GFP_ATOMIC);
 536 }
 537
 538 int st5481_setup_in(struct st5481_in *in)
 539 {
 540         struct usb_device *dev = in->adapter->usb_dev;
 541         int retval;
 542
 543         DBG(4,"");
 544
 545         in->rcvbuf = kmalloc(in->bufsize, GFP_KERNEL);
 546         retval = -ENOMEM;
 547         if (!in->rcvbuf)
 548                 goto err;
 549
 550         retval = st5481_setup_isocpipes(in->urb, dev,
 551                                         usb_rcvisocpipe(dev, in->ep),
 552                                         in->num_packets,  in->packet_size,
 553                                         in->num_packets * in->packet_size,
 554                                         usb_in_complete, in);
 555         if (retval)
 556                 goto err_free;
 557         return 0;
 558
 559  err_free:
 560         kfree(in->rcvbuf);
 561  err:
 562         return retval;
 563 }
 564
 565 void st5481_release_in(struct st5481_in *in)
 566 {
 567         DBG(2,"");
 568
 569         st5481_release_isocpipes(in->urb);
 570 }
 571
 572 /*
 573  * Make the transfer_buffer contiguous by
 574  * copying from the iso descriptors if necessary.
 575  */
 576 static int st5481_isoc_flatten(struct urb *urb)
 577 {
 578         struct usb_iso_packet_descriptor *pipd,*pend;
 579         unsigned char *src,*dst;
 580         unsigned int len;
 581
 582         if (urb->status < 0) {
 583                 return urb->status;
 584         }
 585         for (pipd = &urb->iso_frame_desc[0],
 586                      pend = &urb->iso_frame_desc[urb->number_of_packets],
 587                      dst = urb->transfer_buffer;
 588              pipd < pend;
 589              pipd++) {
 590
 591                 if (pipd->status < 0) {
 592                         return (pipd->status);
 593                 }
 594
 595                 len = pipd->actual_length;
 596                 pipd->actual_length = 0;
 597                 src = urb->transfer_buffer+pipd->offset;
 598
 599                 if (src != dst) {
 600                         // Need to copy since isoc buffers not full
 601                         while (len--) {
 602                                 *dst++ = *src++;
 603                         }
 604                 } else {
 605                         // No need to copy, just update destination buffer
 606                         dst += len;
 607                 }
 608         }
 609         // Return size of flattened buffer
 610         return (dst - (unsigned char *)urb->transfer_buffer);
 611 }
 612
 613 static void st5481_start_rcv(void *context)
 614 {
 615         struct st5481_in *in = context;
 616         struct st5481_adapter *adapter = in->adapter;
 617
 618         DBG(4,"");
 619
 620         in->urb[0]->dev = adapter->usb_dev;
 621         SUBMIT_URB(in->urb[0], GFP_KERNEL);
 622
 623         in->urb[1]->dev = adapter->usb_dev;
 624         SUBMIT_URB(in->urb[1], GFP_KERNEL);
 625 }
 626
 627 void st5481_in_mode(struct st5481_in *in, int mode)
 628 {
 629         if (in->mode == mode)
 630                 return;
 631
 632         in->mode = mode;
 633
 634         usb_unlink_urb(in->urb[0]);
 635         usb_unlink_urb(in->urb[1]);
 636
 637         if (in->mode != L1_MODE_NULL) {
 638                 if (in->mode != L1_MODE_TRANS)
 639                         isdnhdlc_rcv_init(&in->hdlc_state,
 640                                 in->mode == L1_MODE_HDLC_56K);
 641
 642                 st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
 643                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 644                                            in->packet_size,
 645                                            NULL, NULL);
 646                 st5481_start_rcv(in);
 647         } else {
 648                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 649                                            0, NULL, NULL);
 650         }
 651 }
 652