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 = __constant_cpu_to_le16(32);
 271         altsetting->endpoint[4].desc.wMaxPacketSize = __constant_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                 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_kill_urb(ctrl->urb);
 331         kfree(ctrl->urb->transfer_buffer);
 332         usb_free_urb(ctrl->urb);
 333         ctrl->urb = NULL;
 334
 335         usb_kill_urb(intr->urb);
 336         kfree(intr->urb->transfer_buffer);
 337         usb_free_urb(intr->urb);
 338         intr->urb = NULL;
 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         urb->dev=dev;
 404         urb->pipe=pipe;
 405         urb->interval = 1;
 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                         kfree(urb[j]->transfer_buffer);
 451                         urb[j]->transfer_buffer = NULL;
 452                         usb_free_urb(urb[j]);
 453                         urb[j] = NULL;
 454                 }
 455         }
 456         return retval;
 457 }
 458
 459 void st5481_release_isocpipes(struct urb* urb[2])
 460 {
 461         int j;
 462
 463         for (j = 0; j < 2; j++) {
 464                 usb_kill_urb(urb[j]);
 465                 kfree(urb[j]->transfer_buffer);
 466                 usb_free_urb(urb[j]);
 467                 urb[j] = NULL;
 468         }
 469 }
 470
 471 /*
 472  * Decode frames received on the B/D channel.
 473  * Note that this function will be called continuously
 474  * with 64Kbit/s / 16Kbit/s of data and hence it will be
 475  * called 50 times per second with 20 ISOC descriptors.
 476  * Called at interrupt.
 477  */
 478 static void usb_in_complete(struct urb *urb)
 479 {
 480         struct st5481_in *in = urb->context;
 481         unsigned char *ptr;
 482         struct sk_buff *skb;
 483         int len, count, status;
 484
 485         if (unlikely(urb->status < 0)) {
 486                 switch (urb->status) {
 487                         case -ENOENT:
 488                         case -ESHUTDOWN:
 489                         case -ECONNRESET:
 490                                 DBG(1,"urb killed status %d", urb->status);
 491                                 return; // Give up
 492                         default:
 493                                 WARNING("urb status %d",urb->status);
 494                                 break;
 495                 }
 496         }
 497
 498         DBG_ISO_PACKET(0x80,urb);
 499
 500         len = st5481_isoc_flatten(urb);
 501         ptr = urb->transfer_buffer;
 502         while (len > 0) {
 503                 if (in->mode == L1_MODE_TRANS) {
 504                         memcpy(in->rcvbuf, ptr, len);
 505                         status = len;
 506                         len = 0;
 507                 } else {
 508                         status = isdnhdlc_decode(&in->hdlc_state, ptr, len, &count,
 509                                 in->rcvbuf, in->bufsize);
 510                         ptr += count;
 511                         len -= count;
 512                 }
 513
 514                 if (status > 0) {
 515                         // Good frame received
 516                         DBG(4,"count=%d",status);
 517                         DBG_PACKET(0x400, in->rcvbuf, status);
 518                         if (!(skb = dev_alloc_skb(status))) {
 519                                 WARNING("receive out of memory\n");
 520                                 break;
 521                         }
 522                         memcpy(skb_put(skb, status), in->rcvbuf, status);
 523                         in->hisax_if->l1l2(in->hisax_if, PH_DATA | INDICATION, skb);
 524                 } else if (status == -HDLC_CRC_ERROR) {
 525                         INFO("CRC error");
 526                 } else if (status == -HDLC_FRAMING_ERROR) {
 527                         INFO("framing error");
 528                 } else if (status == -HDLC_LENGTH_ERROR) {
 529                         INFO("length error");
 530                 }
 531         }
 532
 533         // Prepare URB for next transfer
 534         urb->dev = in->adapter->usb_dev;
 535         urb->actual_length = 0;
 536
 537         SUBMIT_URB(urb, GFP_ATOMIC);
 538 }
 539
 540 int st5481_setup_in(struct st5481_in *in)
 541 {
 542         struct usb_device *dev = in->adapter->usb_dev;
 543         int retval;
 544
 545         DBG(4,"");
 546
 547         in->rcvbuf = kmalloc(in->bufsize, GFP_KERNEL);
 548         retval = -ENOMEM;
 549         if (!in->rcvbuf)
 550                 goto err;
 551
 552         retval = st5481_setup_isocpipes(in->urb, dev,
 553                                         usb_rcvisocpipe(dev, in->ep),
 554                                         in->num_packets,  in->packet_size,
 555                                         in->num_packets * in->packet_size,
 556                                         usb_in_complete, in);
 557         if (retval)
 558                 goto err_free;
 559         return 0;
 560
 561  err_free:
 562         kfree(in->rcvbuf);
 563  err:
 564         return retval;
 565 }
 566
 567 void st5481_release_in(struct st5481_in *in)
 568 {
 569         DBG(2,"");
 570
 571         st5481_release_isocpipes(in->urb);
 572 }
 573
 574 /*
 575  * Make the transfer_buffer contiguous by
 576  * copying from the iso descriptors if necessary.
 577  */
 578 static int st5481_isoc_flatten(struct urb *urb)
 579 {
 580         struct usb_iso_packet_descriptor *pipd,*pend;
 581         unsigned char *src,*dst;
 582         unsigned int len;
 583
 584         if (urb->status < 0) {
 585                 return urb->status;
 586         }
 587         for (pipd = &urb->iso_frame_desc[0],
 588                      pend = &urb->iso_frame_desc[urb->number_of_packets],
 589                      dst = urb->transfer_buffer;
 590              pipd < pend;
 591              pipd++) {
 592
 593                 if (pipd->status < 0) {
 594                         return (pipd->status);
 595                 }
 596
 597                 len = pipd->actual_length;
 598                 pipd->actual_length = 0;
 599                 src = urb->transfer_buffer+pipd->offset;
 600
 601                 if (src != dst) {
 602                         // Need to copy since isoc buffers not full
 603                         while (len--) {
 604                                 *dst++ = *src++;
 605                         }
 606                 } else {
 607                         // No need to copy, just update destination buffer
 608                         dst += len;
 609                 }
 610         }
 611         // Return size of flattened buffer
 612         return (dst - (unsigned char *)urb->transfer_buffer);
 613 }
 614
 615 static void st5481_start_rcv(void *context)
 616 {
 617         struct st5481_in *in = context;
 618         struct st5481_adapter *adapter = in->adapter;
 619
 620         DBG(4,"");
 621
 622         in->urb[0]->dev = adapter->usb_dev;
 623         SUBMIT_URB(in->urb[0], GFP_KERNEL);
 624
 625         in->urb[1]->dev = adapter->usb_dev;
 626         SUBMIT_URB(in->urb[1], GFP_KERNEL);
 627 }
 628
 629 void st5481_in_mode(struct st5481_in *in, int mode)
 630 {
 631         if (in->mode == mode)
 632                 return;
 633
 634         in->mode = mode;
 635
 636         usb_unlink_urb(in->urb[0]);
 637         usb_unlink_urb(in->urb[1]);
 638
 639         if (in->mode != L1_MODE_NULL) {
 640                 if (in->mode != L1_MODE_TRANS) {
 641                         u32 features = HDLC_BITREVERSE;
 642
 643                         if (in->mode == L1_MODE_HDLC_56K)
 644                                 features |= HDLC_56KBIT;
 645                         isdnhdlc_rcv_init(&in->hdlc_state, features);
 646                 }
 647                 st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
 648                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 649                                            in->packet_size,
 650                                            NULL, NULL);
 651                 st5481_start_rcv(in);
 652         } else {
 653                 st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 654                                            0, NULL, NULL);
 655         }
 656 }
 657