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