drivers/usb/host/sl811-hcd.c

   1 /*
   2  * SL811HS HCD (Host Controller Driver) for USB.
   3  *
   4  * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
   5  * Copyright (C) 2004-2005 David Brownell
   6  *
   7  * Periodic scheduling is based on Roman's OHCI code
   8  *      Copyright (C) 1999 Roman Weissgaerber
   9  *
  10  * The SL811HS controller handles host side USB (like the SL11H, but with
  11  * another register set and SOF generation) as well as peripheral side USB
  12  * (like the SL811S).  This driver version doesn't implement the Gadget API
  13  * for the peripheral role; or OTG (that'd need much external circuitry).
  14  *
  15  * For documentation, see the SL811HS spec and the "SL811HS Embedded Host"
  16  * document (providing significant pieces missing from that spec); plus
  17  * the SL811S spec if you want peripheral side info.
  18  */
  19
  20 /*
  21  * Status:  Passed basic stress testing, works with hubs, mice, keyboards,
  22  * and usb-storage.
  23  *
  24  * TODO:
  25  * - usb suspend/resume triggered by sl811 (with USB_SUSPEND)
  26  * - various issues noted in the code
  27  * - performance work; use both register banks; ...
  28  * - use urb->iso_frame_desc[] with ISO transfers
  29  */
  30
  31 #undef  VERBOSE
  32 #undef  PACKET_TRACE
  33
  34 #include <linux/config.h>
  35
  36 #ifdef CONFIG_USB_DEBUG
  37 #       define DEBUG
  38 #else
  39 #       undef DEBUG
  40 #endif
  41
  42 #include <linux/module.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/kernel.h>
  45 #include <linux/delay.h>
  46 #include <linux/ioport.h>
  47 #include <linux/sched.h>
  48 #include <linux/slab.h>
  49 #include <linux/smp_lock.h>
  50 #include <linux/errno.h>
  51 #include <linux/init.h>
  52 #include <linux/timer.h>
  53 #include <linux/list.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/usb.h>
  56 #include <linux/usb_sl811.h>
  57 #include <linux/platform_device.h>
  58
  59 #include <asm/io.h>
  60 #include <asm/irq.h>
  61 #include <asm/system.h>
  62 #include <asm/byteorder.h>
  63
  64 #include "../core/hcd.h"
  65 #include "sl811.h"
  66
  67
  68 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
  69 MODULE_LICENSE("GPL");
  70
  71 #define DRIVER_VERSION  "19 May 2005"
  72
  73
  74 #ifndef DEBUG
  75 #       define  STUB_DEBUG_FILE
  76 #endif
  77
  78 /* for now, use only one transfer register bank */
  79 #undef  USE_B
  80
  81 /* this doesn't understand urb->iso_frame_desc[], but if you had a driver
  82  * that just queued one ISO frame per URB then iso transfers "should" work
  83  * using the normal urb status fields.
  84  */
  85 #define DISABLE_ISO
  86
  87 // #define      QUIRK2
  88 #define QUIRK3
  89
  90 static const char hcd_name[] = "sl811-hcd";
  91
  92 /*-------------------------------------------------------------------------*/
  93
  94 static void port_power(struct sl811 *sl811, int is_on)
  95 {
  96         struct usb_hcd  *hcd = sl811_to_hcd(sl811);
  97
  98         /* hub is inactive unless the port is powered */
  99         if (is_on) {
 100                 if (sl811->port1 & (1 << USB_PORT_FEAT_POWER))
 101                         return;
 102
 103                 sl811->port1 = (1 << USB_PORT_FEAT_POWER);
 104                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
 105                 hcd->self.controller->power.power_state = PMSG_ON;
 106         } else {
 107                 sl811->port1 = 0;
 108                 sl811->irq_enable = 0;
 109                 hcd->state = HC_STATE_HALT;
 110                 hcd->self.controller->power.power_state = PMSG_SUSPEND;
 111         }
 112         sl811->ctrl1 = 0;
 113         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 114         sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
 115
 116         if (sl811->board && sl811->board->port_power) {
 117                 /* switch VBUS, at 500mA unless hub power budget gets set */
 118                 DBG("power %s\n", is_on ? "on" : "off");
 119                 sl811->board->port_power(hcd->self.controller, is_on);
 120         }
 121
 122         /* reset as thoroughly as we can */
 123         if (sl811->board && sl811->board->reset)
 124                 sl811->board->reset(hcd->self.controller);
 125         else {
 126                 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
 127                 mdelay(20);
 128         }
 129
 130         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 131         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 132         sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
 133         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 134
 135         // if !is_on, put into lowpower mode now
 136 }
 137
 138 /*-------------------------------------------------------------------------*/
 139
 140 /* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
 141  * and may start I/O.  Endpoint queues are scanned during completion irq
 142  * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
 143  *
 144  * Using an external DMA engine to copy a packet at a time could work,
 145  * though setup/teardown costs may be too big to make it worthwhile.
 146  */
 147
 148 /* SETUP starts a new control request.  Devices are not allowed to
 149  * STALL or NAK these; they must cancel any pending control requests.
 150  */
 151 static void setup_packet(
 152         struct sl811            *sl811,
 153         struct sl811h_ep        *ep,
 154         struct urb              *urb,
 155         u8                      bank,
 156         u8                      control
 157 )
 158 {
 159         u8                      addr;
 160         u8                      len;
 161         void __iomem            *data_reg;
 162
 163         addr = SL811HS_PACKET_BUF(bank == 0);
 164         len = sizeof(struct usb_ctrlrequest);
 165         data_reg = sl811->data_reg;
 166         sl811_write_buf(sl811, addr, urb->setup_packet, len);
 167
 168         /* autoincrementing */
 169         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 170         writeb(len, data_reg);
 171         writeb(SL_SETUP /* | ep->epnum */, data_reg);
 172         writeb(usb_pipedevice(urb->pipe), data_reg);
 173
 174         /* always OUT/data0 */ ;
 175         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 176                         control | SL11H_HCTLMASK_OUT);
 177         ep->length = 0;
 178         PACKET("SETUP qh%p\n", ep);
 179 }
 180
 181 /* STATUS finishes control requests, often after IN or OUT data packets */
 182 static void status_packet(
 183         struct sl811            *sl811,
 184         struct sl811h_ep        *ep,
 185         struct urb              *urb,
 186         u8                      bank,
 187         u8                      control
 188 )
 189 {
 190         int                     do_out;
 191         void __iomem            *data_reg;
 192
 193         do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
 194         data_reg = sl811->data_reg;
 195
 196         /* autoincrementing */
 197         sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
 198         writeb(0, data_reg);
 199         writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
 200         writeb(usb_pipedevice(urb->pipe), data_reg);
 201
 202         /* always data1; sometimes IN */
 203         control |= SL11H_HCTLMASK_TOGGLE;
 204         if (do_out)
 205                 control |= SL11H_HCTLMASK_OUT;
 206         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 207         ep->length = 0;
 208         PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
 209                         do_out ? "out" : "in", ep);
 210 }
 211
 212 /* IN packets can be used with any type of endpoint. here we just
 213  * start the transfer, data from the peripheral may arrive later.
 214  * urb->iso_frame_desc is currently ignored here...
 215  */
 216 static void in_packet(
 217         struct sl811            *sl811,
 218         struct sl811h_ep        *ep,
 219         struct urb              *urb,
 220         u8                      bank,
 221         u8                      control
 222 )
 223 {
 224         u8                      addr;
 225         u8                      len;
 226         void __iomem            *data_reg;
 227
 228         /* avoid losing data on overflow */
 229         len = ep->maxpacket;
 230         addr = SL811HS_PACKET_BUF(bank == 0);
 231         if (!(control & SL11H_HCTLMASK_ISOCH)
 232                         && usb_gettoggle(urb->dev, ep->epnum, 0))
 233                 control |= SL11H_HCTLMASK_TOGGLE;
 234         data_reg = sl811->data_reg;
 235
 236         /* autoincrementing */
 237         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 238         writeb(len, data_reg);
 239         writeb(SL_IN | ep->epnum, data_reg);
 240         writeb(usb_pipedevice(urb->pipe), data_reg);
 241
 242         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 243         ep->length = min((int)len,
 244                         urb->transfer_buffer_length - urb->actual_length);
 245         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 246                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
 247 }
 248
 249 /* OUT packets can be used with any type of endpoint.
 250  * urb->iso_frame_desc is currently ignored here...
 251  */
 252 static void out_packet(
 253         struct sl811            *sl811,
 254         struct sl811h_ep        *ep,
 255         struct urb              *urb,
 256         u8                      bank,
 257         u8                      control
 258 )
 259 {
 260         void                    *buf;
 261         u8                      addr;
 262         u8                      len;
 263         void __iomem            *data_reg;
 264
 265         buf = urb->transfer_buffer + urb->actual_length;
 266         prefetch(buf);
 267
 268         len = min((int)ep->maxpacket,
 269                         urb->transfer_buffer_length - urb->actual_length);
 270
 271         if (!(control & SL11H_HCTLMASK_ISOCH)
 272                         && usb_gettoggle(urb->dev, ep->epnum, 1))
 273                 control |= SL11H_HCTLMASK_TOGGLE;
 274         addr = SL811HS_PACKET_BUF(bank == 0);
 275         data_reg = sl811->data_reg;
 276
 277         sl811_write_buf(sl811, addr, buf, len);
 278
 279         /* autoincrementing */
 280         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 281         writeb(len, data_reg);
 282         writeb(SL_OUT | ep->epnum, data_reg);
 283         writeb(usb_pipedevice(urb->pipe), data_reg);
 284
 285         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 286                         control | SL11H_HCTLMASK_OUT);
 287         ep->length = len;
 288         PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 289                         !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
 290 }
 291
 292 /*-------------------------------------------------------------------------*/
 293
 294 /* caller updates on-chip enables later */
 295
 296 static inline void sofirq_on(struct sl811 *sl811)
 297 {
 298         if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
 299                 return;
 300         VDBG("sof irq on\n");
 301         sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
 302 }
 303
 304 static inline void sofirq_off(struct sl811 *sl811)
 305 {
 306         if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
 307                 return;
 308         VDBG("sof irq off\n");
 309         sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
 310 }
 311
 312 /*-------------------------------------------------------------------------*/
 313
 314 /* pick the next endpoint for a transaction, and issue it.
 315  * frames start with periodic transfers (after whatever is pending
 316  * from the previous frame), and the rest of the time is async
 317  * transfers, scheduled round-robin.
 318  */
 319 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
 320 {
 321         struct sl811h_ep        *ep;
 322         struct urb              *urb;
 323         int                     fclock;
 324         u8                      control;
 325
 326         /* use endpoint at schedule head */
 327         if (sl811->next_periodic) {
 328                 ep = sl811->next_periodic;
 329                 sl811->next_periodic = ep->next;
 330         } else {
 331                 if (sl811->next_async)
 332                         ep = sl811->next_async;
 333                 else if (!list_empty(&sl811->async))
 334                         ep = container_of(sl811->async.next,
 335                                         struct sl811h_ep, schedule);
 336                 else {
 337                         /* could set up the first fullspeed periodic
 338                          * transfer for the next frame ...
 339                          */
 340                         return NULL;
 341                 }
 342
 343 #ifdef USE_B
 344                 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
 345                         return NULL;
 346 #endif
 347
 348                 if (ep->schedule.next == &sl811->async)
 349                         sl811->next_async = NULL;
 350                 else
 351                         sl811->next_async = container_of(ep->schedule.next,
 352                                         struct sl811h_ep, schedule);
 353         }
 354
 355         if (unlikely(list_empty(&ep->hep->urb_list))) {
 356                 DBG("empty %p queue?\n", ep);
 357                 return NULL;
 358         }
 359
 360         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 361         control = ep->defctrl;
 362
 363         /* if this frame doesn't have enough time left to transfer this
 364          * packet, wait till the next frame.  too-simple algorithm...
 365          */
 366         fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
 367         fclock -= 100;          /* setup takes not much time */
 368         if (urb->dev->speed == USB_SPEED_LOW) {
 369                 if (control & SL11H_HCTLMASK_PREAMBLE) {
 370                         /* also note erratum 1: some hubs won't work */
 371                         fclock -= 800;
 372                 }
 373                 fclock -= ep->maxpacket << 8;
 374
 375                 /* erratum 2: AFTERSOF only works for fullspeed */
 376                 if (fclock < 0) {
 377                         if (ep->period)
 378                                 sl811->stat_overrun++;
 379                         sofirq_on(sl811);
 380                         return NULL;
 381                 }
 382         } else {
 383                 fclock -= 12000 / 19;   /* 19 64byte packets/msec */
 384                 if (fclock < 0) {
 385                         if (ep->period)
 386                                 sl811->stat_overrun++;
 387                         control |= SL11H_HCTLMASK_AFTERSOF;
 388
 389                 /* throttle bulk/control irq noise */
 390                 } else if (ep->nak_count)
 391                         control |= SL11H_HCTLMASK_AFTERSOF;
 392         }
 393
 394
 395         switch (ep->nextpid) {
 396         case USB_PID_IN:
 397                 in_packet(sl811, ep, urb, bank, control);
 398                 break;
 399         case USB_PID_OUT:
 400                 out_packet(sl811, ep, urb, bank, control);
 401                 break;
 402         case USB_PID_SETUP:
 403                 setup_packet(sl811, ep, urb, bank, control);
 404                 break;
 405         case USB_PID_ACK:               /* for control status */
 406                 status_packet(sl811, ep, urb, bank, control);
 407                 break;
 408         default:
 409                 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
 410                 ep = NULL;
 411         }
 412         return ep;
 413 }
 414
 415 #define MIN_JIFFIES     ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
 416
 417 static inline void start_transfer(struct sl811 *sl811)
 418 {
 419         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
 420                 return;
 421         if (sl811->active_a == NULL) {
 422                 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
 423                 if (sl811->active_a != NULL)
 424                         sl811->jiffies_a = jiffies + MIN_JIFFIES;
 425         }
 426 #ifdef USE_B
 427         if (sl811->active_b == NULL) {
 428                 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
 429                 if (sl811->active_b != NULL)
 430                         sl811->jiffies_b = jiffies + MIN_JIFFIES;
 431         }
 432 #endif
 433 }
 434
 435 static void finish_request(
 436         struct sl811            *sl811,
 437         struct sl811h_ep        *ep,
 438         struct urb              *urb,
 439         struct pt_regs          *regs,
 440         int                     status
 441 ) __releases(sl811->lock) __acquires(sl811->lock)
 442 {
 443         unsigned                i;
 444
 445         if (usb_pipecontrol(urb->pipe))
 446                 ep->nextpid = USB_PID_SETUP;
 447
 448         spin_lock(&urb->lock);
 449         if (urb->status == -EINPROGRESS)
 450                 urb->status = status;
 451         urb->hcpriv = NULL;
 452         spin_unlock(&urb->lock);
 453
 454         spin_unlock(&sl811->lock);
 455         usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, regs);
 456         spin_lock(&sl811->lock);
 457
 458         /* leave active endpoints in the schedule */
 459         if (!list_empty(&ep->hep->urb_list))
 460                 return;
 461
 462         /* async deschedule? */
 463         if (!list_empty(&ep->schedule)) {
 464                 list_del_init(&ep->schedule);
 465                 if (ep == sl811->next_async)
 466                         sl811->next_async = NULL;
 467                 return;
 468         }
 469
 470         /* periodic deschedule */
 471         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 472         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 473                 struct sl811h_ep        *temp;
 474                 struct sl811h_ep        **prev = &sl811->periodic[i];
 475
 476                 while (*prev && ((temp = *prev) != ep))
 477                         prev = &temp->next;
 478                 if (*prev)
 479                         *prev = ep->next;
 480                 sl811->load[i] -= ep->load;
 481         }
 482         ep->branch = PERIODIC_SIZE;
 483         sl811->periodic_count--;
 484         sl811_to_hcd(sl811)->self.bandwidth_allocated
 485                 -= ep->load / ep->period;
 486         if (ep == sl811->next_periodic)
 487                 sl811->next_periodic = ep->next;
 488
 489         /* we might turn SOFs back on again for the async schedule */
 490         if (sl811->periodic_count == 0)
 491                 sofirq_off(sl811);
 492 }
 493
 494 static void
 495 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank, struct pt_regs *regs)
 496 {
 497         u8                      status;
 498         struct urb              *urb;
 499         int                     urbstat = -EINPROGRESS;
 500
 501         if (unlikely(!ep))
 502                 return;
 503
 504         status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
 505
 506         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 507
 508         /* we can safely ignore NAKs */
 509         if (status & SL11H_STATMASK_NAK) {
 510                 // PACKET("...NAK_%02x qh%p\n", bank, ep);
 511                 if (!ep->period)
 512                         ep->nak_count++;
 513                 ep->error_count = 0;
 514
 515         /* ACK advances transfer, toggle, and maybe queue */
 516         } else if (status & SL11H_STATMASK_ACK) {
 517                 struct usb_device       *udev = urb->dev;
 518                 int                     len;
 519                 unsigned char           *buf;
 520
 521                 /* urb->iso_frame_desc is currently ignored here... */
 522
 523                 ep->nak_count = ep->error_count = 0;
 524                 switch (ep->nextpid) {
 525                 case USB_PID_OUT:
 526                         // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
 527                         urb->actual_length += ep->length;
 528                         usb_dotoggle(udev, ep->epnum, 1);
 529                         if (urb->actual_length
 530                                         == urb->transfer_buffer_length) {
 531                                 if (usb_pipecontrol(urb->pipe))
 532                                         ep->nextpid = USB_PID_ACK;
 533
 534                                 /* some bulk protocols terminate OUT transfers
 535                                  * by a short packet, using ZLPs not padding.
 536                                  */
 537                                 else if (ep->length < ep->maxpacket
 538                                                 || !(urb->transfer_flags
 539                                                         & URB_ZERO_PACKET))
 540                                         urbstat = 0;
 541                         }
 542                         break;
 543                 case USB_PID_IN:
 544                         // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
 545                         buf = urb->transfer_buffer + urb->actual_length;
 546                         prefetchw(buf);
 547                         len = ep->maxpacket - sl811_read(sl811,
 548                                                 bank + SL11H_XFERCNTREG);
 549                         if (len > ep->length) {
 550                                 len = ep->length;
 551                                 urb->status = -EOVERFLOW;
 552                         }
 553                         urb->actual_length += len;
 554                         sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
 555                                         buf, len);
 556                         usb_dotoggle(udev, ep->epnum, 0);
 557                         if (urb->actual_length == urb->transfer_buffer_length)
 558                                 urbstat = 0;
 559                         else if (len < ep->maxpacket) {
 560                                 if (urb->transfer_flags & URB_SHORT_NOT_OK)
 561                                         urbstat = -EREMOTEIO;
 562                                 else
 563                                         urbstat = 0;
 564                         }
 565                         if (usb_pipecontrol(urb->pipe)
 566                                         && (urbstat == -EREMOTEIO
 567                                                 || urbstat == 0)) {
 568
 569                                 /* NOTE if the status stage STALLs (why?),
 570                                  * this reports the wrong urb status.
 571                                  */
 572                                 spin_lock(&urb->lock);
 573                                 if (urb->status == -EINPROGRESS)
 574                                         urb->status = urbstat;
 575                                 spin_unlock(&urb->lock);
 576
 577                                 urb = NULL;
 578                                 ep->nextpid = USB_PID_ACK;
 579                         }
 580                         break;
 581                 case USB_PID_SETUP:
 582                         // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
 583                         if (urb->transfer_buffer_length == urb->actual_length)
 584                                 ep->nextpid = USB_PID_ACK;
 585                         else if (usb_pipeout(urb->pipe)) {
 586                                 usb_settoggle(udev, 0, 1, 1);
 587                                 ep->nextpid = USB_PID_OUT;
 588                         } else {
 589                                 usb_settoggle(udev, 0, 0, 1);
 590                                 ep->nextpid = USB_PID_IN;
 591                         }
 592                         break;
 593                 case USB_PID_ACK:
 594                         // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
 595                         urbstat = 0;
 596                         break;
 597                 }
 598
 599         /* STALL stops all transfers */
 600         } else if (status & SL11H_STATMASK_STALL) {
 601                 PACKET("...STALL_%02x qh%p\n", bank, ep);
 602                 ep->nak_count = ep->error_count = 0;
 603                 urbstat = -EPIPE;
 604
 605         /* error? retry, until "3 strikes" */
 606         } else if (++ep->error_count >= 3) {
 607                 if (status & SL11H_STATMASK_TMOUT)
 608                         urbstat = -ETIMEDOUT;
 609                 else if (status & SL11H_STATMASK_OVF)
 610                         urbstat = -EOVERFLOW;
 611                 else
 612                         urbstat = -EPROTO;
 613                 ep->error_count = 0;
 614                 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
 615                                 bank, status, ep, urbstat);
 616         }
 617
 618         if (urb && (urbstat != -EINPROGRESS || urb->status != -EINPROGRESS))
 619                 finish_request(sl811, ep, urb, regs, urbstat);
 620 }
 621
 622 static inline u8 checkdone(struct sl811 *sl811)
 623 {
 624         u8      ctl;
 625         u8      irqstat = 0;
 626
 627         if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
 628                 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
 629                 if (ctl & SL11H_HCTLMASK_ARM)
 630                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 631                 DBG("%s DONE_A: ctrl %02x sts %02x\n",
 632                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 633                         ctl,
 634                         sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
 635                 irqstat |= SL11H_INTMASK_DONE_A;
 636         }
 637 #ifdef  USE_B
 638         if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
 639                 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
 640                 if (ctl & SL11H_HCTLMASK_ARM)
 641                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 642                 DBG("%s DONE_B: ctrl %02x sts %02x\n",
 643                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 644                         ctl,
 645                         sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
 646                 irqstat |= SL11H_INTMASK_DONE_A;
 647         }
 648 #endif
 649         return irqstat;
 650 }
 651
 652 static irqreturn_t sl811h_irq(struct usb_hcd *hcd, struct pt_regs *regs)
 653 {
 654         struct sl811    *sl811 = hcd_to_sl811(hcd);
 655         u8              irqstat;
 656         irqreturn_t     ret = IRQ_NONE;
 657         unsigned        retries = 5;
 658
 659         spin_lock(&sl811->lock);
 660
 661 retry:
 662         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
 663         if (irqstat) {
 664                 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
 665                 irqstat &= sl811->irq_enable;
 666         }
 667
 668 #ifdef  QUIRK2
 669         /* this may no longer be necessary ... */
 670         if (irqstat == 0) {
 671                 irqstat = checkdone(sl811);
 672                 if (irqstat)
 673                         sl811->stat_lost++;
 674         }
 675 #endif
 676
 677         /* USB packets, not necessarily handled in the order they're
 678          * issued ... that's fine if they're different endpoints.
 679          */
 680         if (irqstat & SL11H_INTMASK_DONE_A) {
 681                 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF), regs);
 682                 sl811->active_a = NULL;
 683                 sl811->stat_a++;
 684         }
 685 #ifdef USE_B
 686         if (irqstat & SL11H_INTMASK_DONE_B) {
 687                 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF), regs);
 688                 sl811->active_b = NULL;
 689                 sl811->stat_b++;
 690         }
 691 #endif
 692         if (irqstat & SL11H_INTMASK_SOFINTR) {
 693                 unsigned index;
 694
 695                 index = sl811->frame++ % (PERIODIC_SIZE - 1);
 696                 sl811->stat_sof++;
 697
 698                 /* be graceful about almost-inevitable periodic schedule
 699                  * overruns:  continue the previous frame's transfers iff
 700                  * this one has nothing scheduled.
 701                  */
 702                 if (sl811->next_periodic) {
 703                         // ERR("overrun to slot %d\n", index);
 704                         sl811->stat_overrun++;
 705                 }
 706                 if (sl811->periodic[index])
 707                         sl811->next_periodic = sl811->periodic[index];
 708         }
 709
 710         /* khubd manages debouncing and wakeup */
 711         if (irqstat & SL11H_INTMASK_INSRMV) {
 712                 sl811->stat_insrmv++;
 713
 714                 /* most stats are reset for each VBUS session */
 715                 sl811->stat_wake = 0;
 716                 sl811->stat_sof = 0;
 717                 sl811->stat_a = 0;
 718                 sl811->stat_b = 0;
 719                 sl811->stat_lost = 0;
 720
 721                 sl811->ctrl1 = 0;
 722                 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 723
 724                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
 725                 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 726
 727                 /* usbcore nukes other pending transactions on disconnect */
 728                 if (sl811->active_a) {
 729                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 730                         finish_request(sl811, sl811->active_a,
 731                                 container_of(sl811->active_a
 732                                                 ->hep->urb_list.next,
 733                                         struct urb, urb_list),
 734                                 NULL, -ESHUTDOWN);
 735                         sl811->active_a = NULL;
 736                 }
 737 #ifdef  USE_B
 738                 if (sl811->active_b) {
 739                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 740                         finish_request(sl811, sl811->active_b,
 741                                 container_of(sl811->active_b
 742                                                 ->hep->urb_list.next,
 743                                         struct urb, urb_list),
 744                                 NULL, -ESHUTDOWN);
 745                         sl811->active_b = NULL;
 746                 }
 747 #endif
 748
 749                 /* port status seems weird until after reset, so
 750                  * force the reset and make khubd clean up later.
 751                  */
 752                 sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
 753                                 | (1 << USB_PORT_FEAT_CONNECTION);
 754
 755         } else if (irqstat & SL11H_INTMASK_RD) {
 756                 if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)) {
 757                         DBG("wakeup\n");
 758                         sl811->port1 |= 1 << USB_PORT_FEAT_C_SUSPEND;
 759                         sl811->stat_wake++;
 760                 } else
 761                         irqstat &= ~SL11H_INTMASK_RD;
 762         }
 763
 764         if (irqstat) {
 765                 if (sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 766                         start_transfer(sl811);
 767                 ret = IRQ_HANDLED;
 768                 if (retries--)
 769                         goto retry;
 770         }
 771
 772         if (sl811->periodic_count == 0 && list_empty(&sl811->async))
 773                 sofirq_off(sl811);
 774         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 775
 776         spin_unlock(&sl811->lock);
 777
 778         return ret;
 779 }
 780
 781 /*-------------------------------------------------------------------------*/
 782
 783 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
 784  * this driver doesn't promise that much since it's got to handle an
 785  * IRQ per packet; irq handling latencies also use up that time.
 786  *
 787  * NOTE:  the periodic schedule is a sparse tree, with the load for
 788  * each branch minimized.  see fig 3.5 in the OHCI spec for example.
 789  */
 790 #define MAX_PERIODIC_LOAD       500     /* out of 1000 usec */
 791
 792 static int balance(struct sl811 *sl811, u16 period, u16 load)
 793 {
 794         int     i, branch = -ENOSPC;
 795
 796         /* search for the least loaded schedule branch of that period
 797          * which has enough bandwidth left unreserved.
 798          */
 799         for (i = 0; i < period ; i++) {
 800                 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
 801                         int     j;
 802
 803                         for (j = i; j < PERIODIC_SIZE; j += period) {
 804                                 if ((sl811->load[j] + load)
 805                                                 > MAX_PERIODIC_LOAD)
 806                                         break;
 807                         }
 808                         if (j < PERIODIC_SIZE)
 809                                 continue;
 810                         branch = i;
 811                 }
 812         }
 813         return branch;
 814 }
 815
 816 /*-------------------------------------------------------------------------*/
 817
 818 static int sl811h_urb_enqueue(
 819         struct usb_hcd          *hcd,
 820         struct usb_host_endpoint *hep,
 821         struct urb              *urb,
 822         gfp_t                   mem_flags
 823 ) {
 824         struct sl811            *sl811 = hcd_to_sl811(hcd);
 825         struct usb_device       *udev = urb->dev;
 826         unsigned int            pipe = urb->pipe;
 827         int                     is_out = !usb_pipein(pipe);
 828         int                     type = usb_pipetype(pipe);
 829         int                     epnum = usb_pipeendpoint(pipe);
 830         struct sl811h_ep        *ep = NULL;
 831         unsigned long           flags;
 832         int                     i;
 833         int                     retval = 0;
 834
 835 #ifdef  DISABLE_ISO
 836         if (type == PIPE_ISOCHRONOUS)
 837                 return -ENOSPC;
 838 #endif
 839
 840         /* avoid all allocations within spinlocks */
 841         if (!hep->hcpriv)
 842                 ep = kzalloc(sizeof *ep, mem_flags);
 843
 844         spin_lock_irqsave(&sl811->lock, flags);
 845
 846         /* don't submit to a dead or disabled port */
 847         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 848                         || !HC_IS_RUNNING(hcd->state)) {
 849                 retval = -ENODEV;
 850                 kfree(ep);
 851                 goto fail;
 852         }
 853
 854         if (hep->hcpriv) {
 855                 kfree(ep);
 856                 ep = hep->hcpriv;
 857         } else if (!ep) {
 858                 retval = -ENOMEM;
 859                 goto fail;
 860
 861         } else {
 862                 INIT_LIST_HEAD(&ep->schedule);
 863                 ep->udev = usb_get_dev(udev);
 864                 ep->epnum = epnum;
 865                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
 866                 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
 867                 usb_settoggle(udev, epnum, is_out, 0);
 868
 869                 if (type == PIPE_CONTROL)
 870                         ep->nextpid = USB_PID_SETUP;
 871                 else if (is_out)
 872                         ep->nextpid = USB_PID_OUT;
 873                 else
 874                         ep->nextpid = USB_PID_IN;
 875
 876                 if (ep->maxpacket > H_MAXPACKET) {
 877                         /* iso packets up to 240 bytes could work... */
 878                         DBG("dev %d ep%d maxpacket %d\n",
 879                                 udev->devnum, epnum, ep->maxpacket);
 880                         retval = -EINVAL;
 881                         goto fail;
 882                 }
 883
 884                 if (udev->speed == USB_SPEED_LOW) {
 885                         /* send preamble for external hub? */
 886                         if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
 887                                 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
 888                 }
 889                 switch (type) {
 890                 case PIPE_ISOCHRONOUS:
 891                 case PIPE_INTERRUPT:
 892                         if (urb->interval > PERIODIC_SIZE)
 893                                 urb->interval = PERIODIC_SIZE;
 894                         ep->period = urb->interval;
 895                         ep->branch = PERIODIC_SIZE;
 896                         if (type == PIPE_ISOCHRONOUS)
 897                                 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
 898                         ep->load = usb_calc_bus_time(udev->speed, !is_out,
 899                                 (type == PIPE_ISOCHRONOUS),
 900                                 usb_maxpacket(udev, pipe, is_out))
 901                                         / 1000;
 902                         break;
 903                 }
 904
 905                 ep->hep = hep;
 906                 hep->hcpriv = ep;
 907         }
 908
 909         /* maybe put endpoint into schedule */
 910         switch (type) {
 911         case PIPE_CONTROL:
 912         case PIPE_BULK:
 913                 if (list_empty(&ep->schedule))
 914                         list_add_tail(&ep->schedule, &sl811->async);
 915                 break;
 916         case PIPE_ISOCHRONOUS:
 917         case PIPE_INTERRUPT:
 918                 urb->interval = ep->period;
 919                 if (ep->branch < PERIODIC_SIZE) {
 920                         /* NOTE:  the phase is correct here, but the value
 921                          * needs offsetting by the transfer queue depth.
 922                          * All current drivers ignore start_frame, so this
 923                          * is unlikely to ever matter...
 924                          */
 925                         urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 926                                                 + ep->branch;
 927                         break;
 928                 }
 929
 930                 retval = balance(sl811, ep->period, ep->load);
 931                 if (retval < 0)
 932                         goto fail;
 933                 ep->branch = retval;
 934                 retval = 0;
 935                 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 936                                         + ep->branch;
 937
 938                 /* sort each schedule branch by period (slow before fast)
 939                  * to share the faster parts of the tree without needing
 940                  * dummy/placeholder nodes
 941                  */
 942                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 943                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 944                         struct sl811h_ep        **prev = &sl811->periodic[i];
 945                         struct sl811h_ep        *here = *prev;
 946
 947                         while (here && ep != here) {
 948                                 if (ep->period > here->period)
 949                                         break;
 950                                 prev = &here->next;
 951                                 here = *prev;
 952                         }
 953                         if (ep != here) {
 954                                 ep->next = here;
 955                                 *prev = ep;
 956                         }
 957                         sl811->load[i] += ep->load;
 958                 }
 959                 sl811->periodic_count++;
 960                 hcd->self.bandwidth_allocated += ep->load / ep->period;
 961                 sofirq_on(sl811);
 962         }
 963
 964         /* in case of unlink-during-submit */
 965         spin_lock(&urb->lock);
 966         if (urb->status != -EINPROGRESS) {
 967                 spin_unlock(&urb->lock);
 968                 finish_request(sl811, ep, urb, NULL, 0);
 969                 retval = 0;
 970                 goto fail;
 971         }
 972         urb->hcpriv = hep;
 973         spin_unlock(&urb->lock);
 974
 975         start_transfer(sl811);
 976         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 977 fail:
 978         spin_unlock_irqrestore(&sl811->lock, flags);
 979         return retval;
 980 }
 981
 982 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
 983 {
 984         struct sl811            *sl811 = hcd_to_sl811(hcd);
 985         struct usb_host_endpoint *hep;
 986         unsigned long           flags;
 987         struct sl811h_ep        *ep;
 988         int                     retval = 0;
 989
 990         spin_lock_irqsave(&sl811->lock, flags);
 991         hep = urb->hcpriv;
 992         if (!hep)
 993                 goto fail;
 994
 995         ep = hep->hcpriv;
 996         if (ep) {
 997                 /* finish right away if this urb can't be active ...
 998                  * note that some drivers wrongly expect delays
 999                  */
1000                 if (ep->hep->urb_list.next != &urb->urb_list) {
1001                         /* not front of queue?  never active */
1002
1003                 /* for active transfers, we expect an IRQ */
1004                 } else if (sl811->active_a == ep) {
1005                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
1006                                 /* happens a lot with lowspeed?? */
1007                                 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
1008                                         sl811_read(sl811,
1009                                                 SL811_EP_A(SL11H_HOSTCTLREG)),
1010                                         sl811_read(sl811,
1011                                                 SL811_EP_A(SL11H_PKTSTATREG)));
1012                                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1013                                                 0);
1014                                 sl811->active_a = NULL;
1015                         } else
1016                                 urb = NULL;
1017 #ifdef  USE_B
1018                 } else if (sl811->active_b == ep) {
1019                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
1020                                 /* happens a lot with lowspeed?? */
1021                                 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
1022                                         sl811_read(sl811,
1023                                                 SL811_EP_B(SL11H_HOSTCTLREG)),
1024                                         sl811_read(sl811,
1025                                                 SL811_EP_B(SL11H_PKTSTATREG)));
1026                                 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1027                                                 0);
1028                                 sl811->active_b = NULL;
1029                         } else
1030                                 urb = NULL;
1031 #endif
1032                 } else {
1033                         /* front of queue for inactive endpoint */
1034                 }
1035
1036                 if (urb)
1037                         finish_request(sl811, ep, urb, NULL, 0);
1038                 else
1039                         VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1040                                 (sl811->active_a == ep) ? "A" : "B");
1041         } else
1042 fail:
1043                 retval = -EINVAL;
1044         spin_unlock_irqrestore(&sl811->lock, flags);
1045         return retval;
1046 }
1047
1048 static void
1049 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1050 {
1051         struct sl811h_ep        *ep = hep->hcpriv;
1052
1053         if (!ep)
1054                 return;
1055
1056         /* assume we'd just wait for the irq */
1057         if (!list_empty(&hep->urb_list))
1058                 msleep(3);
1059         if (!list_empty(&hep->urb_list))
1060                 WARN("ep %p not empty?\n", ep);
1061
1062         usb_put_dev(ep->udev);
1063         kfree(ep);
1064         hep->hcpriv = NULL;
1065 }
1066
1067 static int
1068 sl811h_get_frame(struct usb_hcd *hcd)
1069 {
1070         struct sl811 *sl811 = hcd_to_sl811(hcd);
1071
1072         /* wrong except while periodic transfers are scheduled;
1073          * never matches the on-the-wire frame;
1074          * subject to overruns.
1075          */
1076         return sl811->frame;
1077 }
1078
1079
1080 /*-------------------------------------------------------------------------*/
1081
1082 /* the virtual root hub timer IRQ checks for hub status */
1083 static int
1084 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1085 {
1086         struct sl811 *sl811 = hcd_to_sl811(hcd);
1087 #ifdef  QUIRK3
1088         unsigned long flags;
1089
1090         /* non-SMP HACK: use root hub timer as i/o watchdog
1091          * this seems essential when SOF IRQs aren't in use...
1092          */
1093         local_irq_save(flags);
1094         if (!timer_pending(&sl811->timer)) {
1095                 if (sl811h_irq( /* ~0, */ hcd, NULL) != IRQ_NONE)
1096                         sl811->stat_lost++;
1097         }
1098         local_irq_restore(flags);
1099 #endif
1100
1101         if (!(sl811->port1 & (0xffff << 16)))
1102                 return 0;
1103
1104         /* tell khubd port 1 changed */
1105         *buf = (1 << 1);
1106         return 1;
1107 }
1108
1109 static void
1110 sl811h_hub_descriptor (
1111         struct sl811                    *sl811,
1112         struct usb_hub_descriptor       *desc
1113 ) {
1114         u16             temp = 0;
1115
1116         desc->bDescriptorType = 0x29;
1117         desc->bHubContrCurrent = 0;
1118
1119         desc->bNbrPorts = 1;
1120         desc->bDescLength = 9;
1121
1122         /* per-port power switching (gang of one!), or none */
1123         desc->bPwrOn2PwrGood = 0;
1124         if (sl811->board && sl811->board->port_power) {
1125                 desc->bPwrOn2PwrGood = sl811->board->potpg;
1126                 if (!desc->bPwrOn2PwrGood)
1127                         desc->bPwrOn2PwrGood = 10;
1128                 temp = 0x0001;
1129         } else
1130                 temp = 0x0002;
1131
1132         /* no overcurrent errors detection/handling */
1133         temp |= 0x0010;
1134
1135         desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
1136
1137         /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
1138         desc->bitmap[0] = 0 << 1;
1139         desc->bitmap[1] = ~0;
1140 }
1141
1142 static void
1143 sl811h_timer(unsigned long _sl811)
1144 {
1145         struct sl811    *sl811 = (void *) _sl811;
1146         unsigned long   flags;
1147         u8              irqstat;
1148         u8              signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1149         const u32       mask = (1 << USB_PORT_FEAT_CONNECTION)
1150                                 | (1 << USB_PORT_FEAT_ENABLE)
1151                                 | (1 << USB_PORT_FEAT_LOWSPEED);
1152
1153         spin_lock_irqsave(&sl811->lock, flags);
1154
1155         /* stop special signaling */
1156         sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1157         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1158         udelay(3);
1159
1160         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1161
1162         switch (signaling) {
1163         case SL11H_CTL1MASK_SE0:
1164                 DBG("end reset\n");
1165                 sl811->port1 = (1 << USB_PORT_FEAT_C_RESET)
1166                                 | (1 << USB_PORT_FEAT_POWER);
1167                 sl811->ctrl1 = 0;
1168                 /* don't wrongly ack RD */
1169                 if (irqstat & SL11H_INTMASK_INSRMV)
1170                         irqstat &= ~SL11H_INTMASK_RD;
1171                 break;
1172         case SL11H_CTL1MASK_K:
1173                 DBG("end resume\n");
1174                 sl811->port1 &= ~(1 << USB_PORT_FEAT_SUSPEND);
1175                 break;
1176         default:
1177                 DBG("odd timer signaling: %02x\n", signaling);
1178                 break;
1179         }
1180         sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1181
1182         if (irqstat & SL11H_INTMASK_RD) {
1183                 /* usbcore nukes all pending transactions on disconnect */
1184                 if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION))
1185                         sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
1186                                         | (1 << USB_PORT_FEAT_C_ENABLE);
1187                 sl811->port1 &= ~mask;
1188                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1189         } else {
1190                 sl811->port1 |= mask;
1191                 if (irqstat & SL11H_INTMASK_DP)
1192                         sl811->port1 &= ~(1 << USB_PORT_FEAT_LOWSPEED);
1193                 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1194         }
1195
1196         if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION)) {
1197                 u8      ctrl2 = SL811HS_CTL2_INIT;
1198
1199                 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1200 #ifdef USE_B
1201                 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1202 #endif
1203                 if (sl811->port1 & (1 << USB_PORT_FEAT_LOWSPEED)) {
1204                         sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1205                         ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1206                 }
1207
1208                 /* start SOFs flowing, kickstarting with A registers */
1209                 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1210                 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1211                 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1212
1213                 /* autoincrementing */
1214                 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1215                 writeb(SL_SOF, sl811->data_reg);
1216                 writeb(0, sl811->data_reg);
1217                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1218                                 SL11H_HCTLMASK_ARM);
1219
1220                 /* khubd provides debounce delay */
1221         } else {
1222                 sl811->ctrl1 = 0;
1223         }
1224         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1225
1226         /* reenable irqs */
1227         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1228         spin_unlock_irqrestore(&sl811->lock, flags);
1229 }
1230
1231 static int
1232 sl811h_hub_control(
1233         struct usb_hcd  *hcd,
1234         u16             typeReq,
1235         u16             wValue,
1236         u16             wIndex,
1237         char            *buf,
1238         u16             wLength
1239 ) {
1240         struct sl811    *sl811 = hcd_to_sl811(hcd);
1241         int             retval = 0;
1242         unsigned long   flags;
1243
1244         spin_lock_irqsave(&sl811->lock, flags);
1245
1246         switch (typeReq) {
1247         case ClearHubFeature:
1248         case SetHubFeature:
1249                 switch (wValue) {
1250                 case C_HUB_OVER_CURRENT:
1251                 case C_HUB_LOCAL_POWER:
1252                         break;
1253                 default:
1254                         goto error;
1255                 }
1256                 break;
1257         case ClearPortFeature:
1258                 if (wIndex != 1 || wLength != 0)
1259                         goto error;
1260
1261                 switch (wValue) {
1262                 case USB_PORT_FEAT_ENABLE:
1263                         sl811->port1 &= (1 << USB_PORT_FEAT_POWER);
1264                         sl811->ctrl1 = 0;
1265                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1266                         sl811->irq_enable = SL11H_INTMASK_INSRMV;
1267                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1268                                                 sl811->irq_enable);
1269                         break;
1270                 case USB_PORT_FEAT_SUSPEND:
1271                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)))
1272                                 break;
1273
1274                         /* 20 msec of resume/K signaling, other irqs blocked */
1275                         DBG("start resume...\n");
1276                         sl811->irq_enable = 0;
1277                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1278                                                 sl811->irq_enable);
1279                         sl811->ctrl1 |= SL11H_CTL1MASK_K;
1280                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1281
1282                         mod_timer(&sl811->timer, jiffies
1283                                         + msecs_to_jiffies(20));
1284                         break;
1285                 case USB_PORT_FEAT_POWER:
1286                         port_power(sl811, 0);
1287                         break;
1288                 case USB_PORT_FEAT_C_ENABLE:
1289                 case USB_PORT_FEAT_C_SUSPEND:
1290                 case USB_PORT_FEAT_C_CONNECTION:
1291                 case USB_PORT_FEAT_C_OVER_CURRENT:
1292                 case USB_PORT_FEAT_C_RESET:
1293                         break;
1294                 default:
1295                         goto error;
1296                 }
1297                 sl811->port1 &= ~(1 << wValue);
1298                 break;
1299         case GetHubDescriptor:
1300                 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1301                 break;
1302         case GetHubStatus:
1303                 *(__le32 *) buf = cpu_to_le32(0);
1304                 break;
1305         case GetPortStatus:
1306                 if (wIndex != 1)
1307                         goto error;
1308                 *(__le32 *) buf = cpu_to_le32(sl811->port1);
1309
1310 #ifndef VERBOSE
1311         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
1312 #endif
1313                 DBG("GetPortStatus %08x\n", sl811->port1);
1314                 break;
1315         case SetPortFeature:
1316                 if (wIndex != 1 || wLength != 0)
1317                         goto error;
1318                 switch (wValue) {
1319                 case USB_PORT_FEAT_SUSPEND:
1320                         if (sl811->port1 & (1 << USB_PORT_FEAT_RESET))
1321                                 goto error;
1322                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE)))
1323                                 goto error;
1324
1325                         DBG("suspend...\n");
1326                         sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1327                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1328                         break;
1329                 case USB_PORT_FEAT_POWER:
1330                         port_power(sl811, 1);
1331                         break;
1332                 case USB_PORT_FEAT_RESET:
1333                         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
1334                                 goto error;
1335                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_POWER)))
1336                                 break;
1337
1338                         /* 50 msec of reset/SE0 signaling, irqs blocked */
1339                         sl811->irq_enable = 0;
1340                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1341                                                 sl811->irq_enable);
1342                         sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1343                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1344                         sl811->port1 |= (1 << USB_PORT_FEAT_RESET);
1345                         mod_timer(&sl811->timer, jiffies
1346                                         + msecs_to_jiffies(50));
1347                         break;
1348                 default:
1349                         goto error;
1350                 }
1351                 sl811->port1 |= 1 << wValue;
1352                 break;
1353
1354         default:
1355 error:
1356                 /* "protocol stall" on error */
1357                 retval = -EPIPE;
1358         }
1359
1360         spin_unlock_irqrestore(&sl811->lock, flags);
1361         return retval;
1362 }
1363
1364 #ifdef  CONFIG_PM
1365
1366 static int
1367 sl811h_bus_suspend(struct usb_hcd *hcd)
1368 {
1369         // SOFs off
1370         DBG("%s\n", __FUNCTION__);
1371         return 0;
1372 }
1373
1374 static int
1375 sl811h_bus_resume(struct usb_hcd *hcd)
1376 {
1377         // SOFs on
1378         DBG("%s\n", __FUNCTION__);
1379         return 0;
1380 }
1381
1382 #else
1383
1384 #define sl811h_bus_suspend      NULL
1385 #define sl811h_bus_resume       NULL
1386
1387 #endif
1388
1389
1390 /*-------------------------------------------------------------------------*/
1391
1392 #ifdef STUB_DEBUG_FILE
1393
1394 static inline void create_debug_file(struct sl811 *sl811) { }
1395 static inline void remove_debug_file(struct sl811 *sl811) { }
1396
1397 #else
1398
1399 #include <linux/proc_fs.h>
1400 #include <linux/seq_file.h>
1401
1402 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1403 {
1404         seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1405                 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1406                 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1407                 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1408                 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1409                 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1410                 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1411 }
1412
1413 static int proc_sl811h_show(struct seq_file *s, void *unused)
1414 {
1415         struct sl811            *sl811 = s->private;
1416         struct sl811h_ep        *ep;
1417         unsigned                i;
1418
1419         seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1420                 sl811_to_hcd(sl811)->product_desc,
1421                 hcd_name, DRIVER_VERSION,
1422                 sl811->port1);
1423
1424         seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1425         seq_printf(s, "current session:  done_a %ld done_b %ld "
1426                         "wake %ld sof %ld overrun %ld lost %ld\n\n",
1427                 sl811->stat_a, sl811->stat_b,
1428                 sl811->stat_wake, sl811->stat_sof,
1429                 sl811->stat_overrun, sl811->stat_lost);
1430
1431         spin_lock_irq(&sl811->lock);
1432
1433         if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1434                 seq_printf(s, "(suspended)\n\n");
1435         else {
1436                 u8      t = sl811_read(sl811, SL11H_CTLREG1);
1437
1438                 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1439                         (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1440                         ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1441                         case SL11H_CTL1MASK_NORMAL: s = ""; break;
1442                         case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1443                         case SL11H_CTL1MASK_K: s = " k/resume"; break;
1444                         default: s = "j"; break;
1445                         }; s; }),
1446                         (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1447                         (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1448
1449                 dump_irq(s, "irq_enable",
1450                                 sl811_read(sl811, SL11H_IRQ_ENABLE));
1451                 dump_irq(s, "irq_status",
1452                                 sl811_read(sl811, SL11H_IRQ_STATUS));
1453                 seq_printf(s, "frame clocks remaining:  %d\n",
1454                                 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1455         }
1456
1457         seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1458                 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1459                 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1460         seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1461                 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1462                 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1463         seq_printf(s, "\n");
1464         list_for_each_entry (ep, &sl811->async, schedule) {
1465                 struct urb              *urb;
1466
1467                 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1468                                         " nak %d err %d\n",
1469                         (ep == sl811->active_a) ? "(A) " : "",
1470                         (ep == sl811->active_b) ? "(B) " : "",
1471                         ep, ep->epnum,
1472                         ({ char *s; switch (ep->nextpid) {
1473                         case USB_PID_IN: s = "in"; break;
1474                         case USB_PID_OUT: s = "out"; break;
1475                         case USB_PID_SETUP: s = "setup"; break;
1476                         case USB_PID_ACK: s = "status"; break;
1477                         default: s = "?"; break;
1478                         }; s;}),
1479                         ep->maxpacket,
1480                         ep->nak_count, ep->error_count);
1481                 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1482                         seq_printf(s, "  urb%p, %d/%d\n", urb,
1483                                 urb->actual_length,
1484                                 urb->transfer_buffer_length);
1485                 }
1486         }
1487         if (!list_empty(&sl811->async))
1488                 seq_printf(s, "\n");
1489
1490         seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1491
1492         for (i = 0; i < PERIODIC_SIZE; i++) {
1493                 ep = sl811->periodic[i];
1494                 if (!ep)
1495                         continue;
1496                 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1497
1498                 /* DUMB: prints shared entries multiple times */
1499                 do {
1500                         seq_printf(s,
1501                                 "   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1502                                         "err %d\n",
1503                                 (ep == sl811->active_a) ? "(A) " : "",
1504                                 (ep == sl811->active_b) ? "(B) " : "",
1505                                 ep->period, ep,
1506                                 (ep->udev->speed == USB_SPEED_FULL)
1507                                         ? "" : "ls ",
1508                                 ep->udev->devnum, ep->epnum,
1509                                 (ep->epnum == 0) ? ""
1510                                         : ((ep->nextpid == USB_PID_IN)
1511                                                 ? "in"
1512                                                 : "out"),
1513                                 ep->maxpacket, ep->error_count);
1514                         ep = ep->next;
1515                 } while (ep);
1516         }
1517
1518         spin_unlock_irq(&sl811->lock);
1519         seq_printf(s, "\n");
1520
1521         return 0;
1522 }
1523
1524 static int proc_sl811h_open(struct inode *inode, struct file *file)
1525 {
1526         return single_open(file, proc_sl811h_show, PDE(inode)->data);
1527 }
1528
1529 static struct file_operations proc_ops = {
1530         .open           = proc_sl811h_open,
1531         .read           = seq_read,
1532         .llseek         = seq_lseek,
1533         .release        = single_release,
1534 };
1535
1536 /* expect just one sl811 per system */
1537 static const char proc_filename[] = "driver/sl811h";
1538
1539 static void create_debug_file(struct sl811 *sl811)
1540 {
1541         struct proc_dir_entry *pde;
1542
1543         pde = create_proc_entry(proc_filename, 0, NULL);
1544         if (pde == NULL)
1545                 return;
1546
1547         pde->proc_fops = &proc_ops;
1548         pde->data = sl811;
1549         sl811->pde = pde;
1550 }
1551
1552 static void remove_debug_file(struct sl811 *sl811)
1553 {
1554         if (sl811->pde)
1555                 remove_proc_entry(proc_filename, NULL);
1556 }
1557
1558 #endif
1559
1560 /*-------------------------------------------------------------------------*/
1561
1562 static void
1563 sl811h_stop(struct usb_hcd *hcd)
1564 {
1565         struct sl811    *sl811 = hcd_to_sl811(hcd);
1566         unsigned long   flags;
1567
1568         del_timer_sync(&hcd->rh_timer);
1569
1570         spin_lock_irqsave(&sl811->lock, flags);
1571         port_power(sl811, 0);
1572         spin_unlock_irqrestore(&sl811->lock, flags);
1573 }
1574
1575 static int
1576 sl811h_start(struct usb_hcd *hcd)
1577 {
1578         struct sl811            *sl811 = hcd_to_sl811(hcd);
1579
1580         /* chip has been reset, VBUS power is off */
1581         hcd->state = HC_STATE_RUNNING;
1582
1583         if (sl811->board) {
1584                 hcd->can_wakeup = sl811->board->can_wakeup;
1585                 hcd->power_budget = sl811->board->power * 2;
1586         }
1587
1588         /* enable power and interupts */
1589         port_power(sl811, 1);
1590
1591         return 0;
1592 }
1593
1594 /*-------------------------------------------------------------------------*/
1595
1596 static struct hc_driver sl811h_hc_driver = {
1597         .description =          hcd_name,
1598         .hcd_priv_size =        sizeof(struct sl811),
1599
1600         /*
1601          * generic hardware linkage
1602          */
1603         .irq =                  sl811h_irq,
1604         .flags =                HCD_USB11 | HCD_MEMORY,
1605
1606         /* Basic lifecycle operations */
1607         .start =                sl811h_start,
1608         .stop =                 sl811h_stop,
1609
1610         /*
1611          * managing i/o requests and associated device resources
1612          */
1613         .urb_enqueue =          sl811h_urb_enqueue,
1614         .urb_dequeue =          sl811h_urb_dequeue,
1615         .endpoint_disable =     sl811h_endpoint_disable,
1616
1617         /*
1618          * periodic schedule support
1619          */
1620         .get_frame_number =     sl811h_get_frame,
1621
1622         /*
1623          * root hub support
1624          */
1625         .hub_status_data =      sl811h_hub_status_data,
1626         .hub_control =          sl811h_hub_control,
1627         .bus_suspend =          sl811h_bus_suspend,
1628         .bus_resume =           sl811h_bus_resume,
1629 };
1630
1631 /*-------------------------------------------------------------------------*/
1632
1633 static int __devexit
1634 sl811h_remove(struct device *dev)
1635 {
1636         struct usb_hcd          *hcd = dev_get_drvdata(dev);
1637         struct sl811            *sl811 = hcd_to_sl811(hcd);
1638         struct platform_device  *pdev;
1639         struct resource         *res;
1640
1641         pdev = container_of(dev, struct platform_device, dev);
1642
1643         remove_debug_file(sl811);
1644         usb_remove_hcd(hcd);
1645
1646         /* some platforms may use IORESOURCE_IO */
1647         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1648         if (res)
1649                 iounmap(sl811->data_reg);
1650
1651         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1652         if (res)
1653                 iounmap(sl811->addr_reg);
1654
1655         usb_put_hcd(hcd);
1656         return 0;
1657 }
1658
1659 static int __devinit
1660 sl811h_probe(struct device *dev)
1661 {
1662         struct usb_hcd          *hcd;
1663         struct sl811            *sl811;
1664         struct platform_device  *pdev;
1665         struct resource         *addr, *data;
1666         int                     irq;
1667         void __iomem            *addr_reg;
1668         void __iomem            *data_reg;
1669         int                     retval;
1670         u8                      tmp, ioaddr = 0;
1671
1672         /* basic sanity checks first.  board-specific init logic should
1673          * have initialized these three resources and probably board
1674          * specific platform_data.  we don't probe for IRQs, and do only
1675          * minimal sanity checking.
1676          */
1677         pdev = container_of(dev, struct platform_device, dev);
1678         irq = platform_get_irq(pdev, 0);
1679         if (pdev->num_resources < 3 || irq < 0)
1680                 return -ENODEV;
1681
1682         /* refuse to confuse usbcore */
1683         if (dev->dma_mask) {
1684                 DBG("no we won't dma\n");
1685                 return -EINVAL;
1686         }
1687
1688         /* the chip may be wired for either kind of addressing */
1689         addr = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1690         data = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1691         retval = -EBUSY;
1692         if (!addr || !data) {
1693                 addr = platform_get_resource(pdev, IORESOURCE_IO, 0);
1694                 data = platform_get_resource(pdev, IORESOURCE_IO, 1);
1695                 if (!addr || !data)
1696                         return -ENODEV;
1697                 ioaddr = 1;
1698
1699                 addr_reg = (void __iomem *) addr->start;
1700                 data_reg = (void __iomem *) data->start;
1701         } else {
1702                 addr_reg = ioremap(addr->start, 1);
1703                 if (addr_reg == NULL) {
1704                         retval = -ENOMEM;
1705                         goto err2;
1706                 }
1707
1708                 data_reg = ioremap(data->start, 1);
1709                 if (data_reg == NULL) {
1710                         retval = -ENOMEM;
1711                         goto err4;
1712                 }
1713         }
1714
1715         /* allocate and initialize hcd */
1716         hcd = usb_create_hcd(&sl811h_hc_driver, dev, dev->bus_id);
1717         if (!hcd) {
1718                 retval = -ENOMEM;
1719                 goto err5;
1720         }
1721         hcd->rsrc_start = addr->start;
1722         sl811 = hcd_to_sl811(hcd);
1723
1724         spin_lock_init(&sl811->lock);
1725         INIT_LIST_HEAD(&sl811->async);
1726         sl811->board = dev->platform_data;
1727         init_timer(&sl811->timer);
1728         sl811->timer.function = sl811h_timer;
1729         sl811->timer.data = (unsigned long) sl811;
1730         sl811->addr_reg = addr_reg;
1731         sl811->data_reg = data_reg;
1732
1733         spin_lock_irq(&sl811->lock);
1734         port_power(sl811, 0);
1735         spin_unlock_irq(&sl811->lock);
1736         msleep(200);
1737
1738         tmp = sl811_read(sl811, SL11H_HWREVREG);
1739         switch (tmp >> 4) {
1740         case 1:
1741                 hcd->product_desc = "SL811HS v1.2";
1742                 break;
1743         case 2:
1744                 hcd->product_desc = "SL811HS v1.5";
1745                 break;
1746         default:
1747                 /* reject case 0, SL11S is less functional */
1748                 DBG("chiprev %02x\n", tmp);
1749                 retval = -ENXIO;
1750                 goto err6;
1751         }
1752
1753         /* The chip's IRQ is level triggered, active high.  A requirement
1754          * for platform device setup is to cope with things like signal
1755          * inverters (e.g. CF is active low) or working only with edge
1756          * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1757          * was on a system with single edge triggering, so most sorts of
1758          * triggering arrangement should work.
1759          */
1760         retval = usb_add_hcd(hcd, irq, SA_INTERRUPT | SA_SHIRQ);
1761         if (retval != 0)
1762                 goto err6;
1763
1764         create_debug_file(sl811);
1765         return retval;
1766
1767  err6:
1768         usb_put_hcd(hcd);
1769  err5:
1770         if (!ioaddr)
1771                 iounmap(data_reg);
1772  err4:
1773         if (!ioaddr)
1774                 iounmap(addr_reg);
1775  err2:
1776         DBG("init error, %d\n", retval);
1777         return retval;
1778 }
1779
1780 #ifdef  CONFIG_PM
1781
1782 /* for this device there's no useful distinction between the controller
1783  * and its root hub, except that the root hub only gets direct PM calls
1784  * when CONFIG_USB_SUSPEND is enabled.
1785  */
1786
1787 static int
1788 sl811h_suspend(struct device *dev, pm_message_t state)
1789 {
1790         struct usb_hcd  *hcd = dev_get_drvdata(dev);
1791         struct sl811    *sl811 = hcd_to_sl811(hcd);
1792         int             retval = 0;
1793
1794         if (state.event == PM_EVENT_FREEZE)
1795                 retval = sl811h_bus_suspend(hcd);
1796         else if (state.event == PM_EVENT_SUSPEND)
1797                 port_power(sl811, 0);
1798         if (retval == 0)
1799                 dev->power.power_state = state;
1800         return retval;
1801 }
1802
1803 static int
1804 sl811h_resume(struct device *dev)
1805 {
1806         struct usb_hcd  *hcd = dev_get_drvdata(dev);
1807         struct sl811    *sl811 = hcd_to_sl811(hcd);
1808
1809         /* with no "check to see if VBUS is still powered" board hook,
1810          * let's assume it'd only be powered to enable remote wakeup.
1811          */
1812         if (dev->power.power_state.event == PM_EVENT_SUSPEND
1813                         || !hcd->can_wakeup) {
1814                 sl811->port1 = 0;
1815                 port_power(sl811, 1);
1816                 return 0;
1817         }
1818
1819         dev->power.power_state = PMSG_ON;
1820         return sl811h_bus_resume(hcd);
1821 }
1822
1823 #else
1824
1825 #define sl811h_suspend  NULL
1826 #define sl811h_resume   NULL
1827
1828 #endif
1829
1830
1831 /* this driver is exported so sl811_cs can depend on it */
1832 struct device_driver sl811h_driver = {
1833         .name =         (char *) hcd_name,
1834         .bus =          &platform_bus_type,
1835         .owner =        THIS_MODULE,
1836
1837         .probe =        sl811h_probe,
1838         .remove =       __devexit_p(sl811h_remove),
1839
1840         .suspend =      sl811h_suspend,
1841         .resume =       sl811h_resume,
1842 };
1843 EXPORT_SYMBOL(sl811h_driver);
1844
1845 /*-------------------------------------------------------------------------*/
1846
1847 static int __init sl811h_init(void)
1848 {
1849         if (usb_disabled())
1850                 return -ENODEV;
1851
1852         INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1853         return driver_register(&sl811h_driver);
1854 }
1855 module_init(sl811h_init);
1856
1857 static void __exit sl811h_cleanup(void)
1858 {
1859         driver_unregister(&sl811h_driver);
1860 }
1861 module_exit(sl811h_cleanup);