git.oblomov.eu Git - linux-2.6/blob - 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
  58 #include <asm/io.h>
  59 #include <asm/irq.h>
  60 #include <asm/system.h>
  61 #include <asm/byteorder.h>
  62
  63 #include "../core/hcd.h"
  64 #include "sl811.h"
  65
  66
  67 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
  68 MODULE_LICENSE("GPL");
  69
  70 #define DRIVER_VERSION  "19 May 2005"
  71
  72
  73 #ifndef DEBUG
  74 #       define  STUB_DEBUG_FILE
  75 #endif
  76
  77 /* for now, use only one transfer register bank */
  78 #undef  USE_B
  79
  80 /* this doesn't understand urb->iso_frame_desc[], but if you had a driver
  81  * that just queued one ISO frame per URB then iso transfers "should" work
  82  * using the normal urb status fields.
  83  */
  84 #define DISABLE_ISO
  85
  86 // #define      QUIRK2
  87 #define QUIRK3
  88
  89 static const char hcd_name[] = "sl811-hcd";
  90
  91 /*-------------------------------------------------------------------------*/
  92
  93 static void port_power(struct sl811 *sl811, int is_on)
  94 {
  95         struct usb_hcd  *hcd = sl811_to_hcd(sl811);
  96
  97         /* hub is inactive unless the port is powered */
  98         if (is_on) {
  99                 if (sl811->port1 & (1 << USB_PORT_FEAT_POWER))
 100                         return;
 101
 102                 sl811->port1 = (1 << USB_PORT_FEAT_POWER);
 103                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
 104                 hcd->self.controller->power.power_state = PMSG_ON;
 105         } else {
 106                 sl811->port1 = 0;
 107                 sl811->irq_enable = 0;
 108                 hcd->state = HC_STATE_HALT;
 109                 hcd->self.controller->power.power_state = PMSG_SUSPEND;
 110         }
 111         sl811->ctrl1 = 0;
 112         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 113         sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
 114
 115         if (sl811->board && sl811->board->port_power) {
 116                 /* switch VBUS, at 500mA unless hub power budget gets set */
 117                 DBG("power %s\n", is_on ? "on" : "off");
 118                 sl811->board->port_power(hcd->self.controller, is_on);
 119         }
 120
 121         /* reset as thoroughly as we can */
 122         if (sl811->board && sl811->board->reset)
 123                 sl811->board->reset(hcd->self.controller);
 124         else {
 125                 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
 126                 mdelay(20);
 127         }
 128
 129         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 130         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 131         sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
 132         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 133
 134         // if !is_on, put into lowpower mode now
 135 }
 136
 137 /*-------------------------------------------------------------------------*/
 138
 139 /* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
 140  * and may start I/O.  Endpoint queues are scanned during completion irq
 141  * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
 142  *
 143  * Using an external DMA engine to copy a packet at a time could work,
 144  * though setup/teardown costs may be too big to make it worthwhile.
 145  */
 146
 147 /* SETUP starts a new control request.  Devices are not allowed to
 148  * STALL or NAK these; they must cancel any pending control requests.
 149  */
 150 static void setup_packet(
 151         struct sl811            *sl811,
 152         struct sl811h_ep        *ep,
 153         struct urb              *urb,
 154         u8                      bank,
 155         u8                      control
 156 )
 157 {
 158         u8                      addr;
 159         u8                      len;
 160         void __iomem            *data_reg;
 161
 162         addr = SL811HS_PACKET_BUF(bank == 0);
 163         len = sizeof(struct usb_ctrlrequest);
 164         data_reg = sl811->data_reg;
 165         sl811_write_buf(sl811, addr, urb->setup_packet, len);
 166
 167         /* autoincrementing */
 168         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 169         writeb(len, data_reg);
 170         writeb(SL_SETUP /* | ep->epnum */, data_reg);
 171         writeb(usb_pipedevice(urb->pipe), data_reg);
 172
 173         /* always OUT/data0 */ ;
 174         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 175                         control | SL11H_HCTLMASK_OUT);
 176         ep->length = 0;
 177         PACKET("SETUP qh%p\n", ep);
 178 }
 179
 180 /* STATUS finishes control requests, often after IN or OUT data packets */
 181 static void status_packet(
 182         struct sl811            *sl811,
 183         struct sl811h_ep        *ep,
 184         struct urb              *urb,
 185         u8                      bank,
 186         u8                      control
 187 )
 188 {
 189         int                     do_out;
 190         void __iomem            *data_reg;
 191
 192         do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
 193         data_reg = sl811->data_reg;
 194
 195         /* autoincrementing */
 196         sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
 197         writeb(0, data_reg);
 198         writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
 199         writeb(usb_pipedevice(urb->pipe), data_reg);
 200
 201         /* always data1; sometimes IN */
 202         control |= SL11H_HCTLMASK_TOGGLE;
 203         if (do_out)
 204                 control |= SL11H_HCTLMASK_OUT;
 205         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 206         ep->length = 0;
 207         PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
 208                         do_out ? "out" : "in", ep);
 209 }
 210
 211 /* IN packets can be used with any type of endpoint. here we just
 212  * start the transfer, data from the peripheral may arrive later.
 213  * urb->iso_frame_desc is currently ignored here...
 214  */
 215 static void in_packet(
 216         struct sl811            *sl811,
 217         struct sl811h_ep        *ep,
 218         struct urb              *urb,
 219         u8                      bank,
 220         u8                      control
 221 )
 222 {
 223         u8                      addr;
 224         u8                      len;
 225         void __iomem            *data_reg;
 226
 227         /* avoid losing data on overflow */
 228         len = ep->maxpacket;
 229         addr = SL811HS_PACKET_BUF(bank == 0);
 230         if (!(control & SL11H_HCTLMASK_ISOCH)
 231                         && usb_gettoggle(urb->dev, ep->epnum, 0))
 232                 control |= SL11H_HCTLMASK_TOGGLE;
 233         data_reg = sl811->data_reg;
 234
 235         /* autoincrementing */
 236         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 237         writeb(len, data_reg);
 238         writeb(SL_IN | ep->epnum, data_reg);
 239         writeb(usb_pipedevice(urb->pipe), data_reg);
 240
 241         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 242         ep->length = min((int)len,
 243                         urb->transfer_buffer_length - urb->actual_length);
 244         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 245                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
 246 }
 247
 248 /* OUT packets can be used with any type of endpoint.
 249  * urb->iso_frame_desc is currently ignored here...
 250  */
 251 static void out_packet(
 252         struct sl811            *sl811,
 253         struct sl811h_ep        *ep,
 254         struct urb              *urb,
 255         u8                      bank,
 256         u8                      control
 257 )
 258 {
 259         void                    *buf;
 260         u8                      addr;
 261         u8                      len;
 262         void __iomem            *data_reg;
 263
 264         buf = urb->transfer_buffer + urb->actual_length;
 265         prefetch(buf);
 266
 267         len = min((int)ep->maxpacket,
 268                         urb->transfer_buffer_length - urb->actual_length);
 269
 270         if (!(control & SL11H_HCTLMASK_ISOCH)
 271                         && usb_gettoggle(urb->dev, ep->epnum, 1))
 272                 control |= SL11H_HCTLMASK_TOGGLE;
 273         addr = SL811HS_PACKET_BUF(bank == 0);
 274         data_reg = sl811->data_reg;
 275
 276         sl811_write_buf(sl811, addr, buf, len);
 277
 278         /* autoincrementing */
 279         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 280         writeb(len, data_reg);
 281         writeb(SL_OUT | ep->epnum, data_reg);
 282         writeb(usb_pipedevice(urb->pipe), data_reg);
 283
 284         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 285                         control | SL11H_HCTLMASK_OUT);
 286         ep->length = len;
 287         PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 288                         !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
 289 }
 290
 291 /*-------------------------------------------------------------------------*/
 292
 293 /* caller updates on-chip enables later */
 294
 295 static inline void sofirq_on(struct sl811 *sl811)
 296 {
 297         if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
 298                 return;
 299         VDBG("sof irq on\n");
 300         sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
 301 }
 302
 303 static inline void sofirq_off(struct sl811 *sl811)
 304 {
 305         if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
 306                 return;
 307         VDBG("sof irq off\n");
 308         sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
 309 }
 310
 311 /*-------------------------------------------------------------------------*/
 312
 313 /* pick the next endpoint for a transaction, and issue it.
 314  * frames start with periodic transfers (after whatever is pending
 315  * from the previous frame), and the rest of the time is async
 316  * transfers, scheduled round-robin.
 317  */
 318 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
 319 {
 320         struct sl811h_ep        *ep;
 321         struct urb              *urb;
 322         int                     fclock;
 323         u8                      control;
 324
 325         /* use endpoint at schedule head */
 326         if (sl811->next_periodic) {
 327                 ep = sl811->next_periodic;
 328                 sl811->next_periodic = ep->next;
 329         } else {
 330                 if (sl811->next_async)
 331                         ep = sl811->next_async;
 332                 else if (!list_empty(&sl811->async))
 333                         ep = container_of(sl811->async.next,
 334                                         struct sl811h_ep, schedule);
 335                 else {
 336                         /* could set up the first fullspeed periodic
 337                          * transfer for the next frame ...
 338                          */
 339                         return NULL;
 340                 }
 341
 342 #ifdef USE_B
 343                 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
 344                         return NULL;
 345 #endif
 346
 347                 if (ep->schedule.next == &sl811->async)
 348                         sl811->next_async = NULL;
 349                 else
 350                         sl811->next_async = container_of(ep->schedule.next,
 351                                         struct sl811h_ep, schedule);
 352         }
 353
 354         if (unlikely(list_empty(&ep->hep->urb_list))) {
 355                 DBG("empty %p queue?\n", ep);
 356                 return NULL;
 357         }
 358
 359         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 360         control = ep->defctrl;
 361
 362         /* if this frame doesn't have enough time left to transfer this
 363          * packet, wait till the next frame.  too-simple algorithm...
 364          */
 365         fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
 366         fclock -= 100;          /* setup takes not much time */
 367         if (urb->dev->speed == USB_SPEED_LOW) {
 368                 if (control & SL11H_HCTLMASK_PREAMBLE) {
 369                         /* also note erratum 1: some hubs won't work */
 370                         fclock -= 800;
 371                 }
 372                 fclock -= ep->maxpacket << 8;
 373
 374                 /* erratum 2: AFTERSOF only works for fullspeed */
 375                 if (fclock < 0) {
 376                         if (ep->period)
 377                                 sl811->stat_overrun++;
 378                         sofirq_on(sl811);
 379                         return NULL;
 380                 }
 381         } else {
 382                 fclock -= 12000 / 19;   /* 19 64byte packets/msec */
 383                 if (fclock < 0) {
 384                         if (ep->period)
 385                                 sl811->stat_overrun++;
 386                         control |= SL11H_HCTLMASK_AFTERSOF;
 387
 388                 /* throttle bulk/control irq noise */
 389                 } else if (ep->nak_count)
 390                         control |= SL11H_HCTLMASK_AFTERSOF;
 391         }
 392
 393
 394         switch (ep->nextpid) {
 395         case USB_PID_IN:
 396                 in_packet(sl811, ep, urb, bank, control);
 397                 break;
 398         case USB_PID_OUT:
 399                 out_packet(sl811, ep, urb, bank, control);
 400                 break;
 401         case USB_PID_SETUP:
 402                 setup_packet(sl811, ep, urb, bank, control);
 403                 break;
 404         case USB_PID_ACK:               /* for control status */
 405                 status_packet(sl811, ep, urb, bank, control);
 406                 break;
 407         default:
 408                 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
 409                 ep = NULL;
 410         }
 411         return ep;
 412 }
 413
 414 #define MIN_JIFFIES     ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
 415
 416 static inline void start_transfer(struct sl811 *sl811)
 417 {
 418         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
 419                 return;
 420         if (sl811->active_a == NULL) {
 421                 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
 422                 if (sl811->active_a != NULL)
 423                         sl811->jiffies_a = jiffies + MIN_JIFFIES;
 424         }
 425 #ifdef USE_B
 426         if (sl811->active_b == NULL) {
 427                 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
 428                 if (sl811->active_b != NULL)
 429                         sl811->jiffies_b = jiffies + MIN_JIFFIES;
 430         }
 431 #endif
 432 }
 433
 434 static void finish_request(
 435         struct sl811            *sl811,
 436         struct sl811h_ep        *ep,
 437         struct urb              *urb,
 438         struct pt_regs          *regs,
 439         int                     status
 440 ) __releases(sl811->lock) __acquires(sl811->lock)
 441 {
 442         unsigned                i;
 443
 444         if (usb_pipecontrol(urb->pipe))
 445                 ep->nextpid = USB_PID_SETUP;
 446
 447         spin_lock(&urb->lock);
 448         if (urb->status == -EINPROGRESS)
 449                 urb->status = status;
 450         urb->hcpriv = NULL;
 451         spin_unlock(&urb->lock);
 452
 453         spin_unlock(&sl811->lock);
 454         usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, regs);
 455         spin_lock(&sl811->lock);
 456
 457         /* leave active endpoints in the schedule */
 458         if (!list_empty(&ep->hep->urb_list))
 459                 return;
 460
 461         /* async deschedule? */
 462         if (!list_empty(&ep->schedule)) {
 463                 list_del_init(&ep->schedule);
 464                 if (ep == sl811->next_async)
 465                         sl811->next_async = NULL;
 466                 return;
 467         }
 468
 469         /* periodic deschedule */
 470         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 471         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 472                 struct sl811h_ep        *temp;
 473                 struct sl811h_ep        **prev = &sl811->periodic[i];
 474
 475                 while (*prev && ((temp = *prev) != ep))
 476                         prev = &temp->next;
 477                 if (*prev)
 478                         *prev = ep->next;
 479                 sl811->load[i] -= ep->load;
 480         }
 481         ep->branch = PERIODIC_SIZE;
 482         sl811->periodic_count--;
 483         sl811_to_hcd(sl811)->self.bandwidth_allocated
 484                 -= ep->load / ep->period;
 485         if (ep == sl811->next_periodic)
 486                 sl811->next_periodic = ep->next;
 487
 488         /* we might turn SOFs back on again for the async schedule */
 489         if (sl811->periodic_count == 0)
 490                 sofirq_off(sl811);
 491 }
 492
 493 static void
 494 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank, struct pt_regs *regs)
 495 {
 496         u8                      status;
 497         struct urb              *urb;
 498         int                     urbstat = -EINPROGRESS;
 499
 500         if (unlikely(!ep))
 501                 return;
 502
 503         status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
 504
 505         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 506
 507         /* we can safely ignore NAKs */
 508         if (status & SL11H_STATMASK_NAK) {
 509                 // PACKET("...NAK_%02x qh%p\n", bank, ep);
 510                 if (!ep->period)
 511                         ep->nak_count++;
 512                 ep->error_count = 0;
 513
 514         /* ACK advances transfer, toggle, and maybe queue */
 515         } else if (status & SL11H_STATMASK_ACK) {
 516                 struct usb_device       *udev = urb->dev;
 517                 int                     len;
 518                 unsigned char           *buf;
 519
 520                 /* urb->iso_frame_desc is currently ignored here... */
 521
 522                 ep->nak_count = ep->error_count = 0;
 523                 switch (ep->nextpid) {
 524                 case USB_PID_OUT:
 525                         // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
 526                         urb->actual_length += ep->length;
 527                         usb_dotoggle(udev, ep->epnum, 1);
 528                         if (urb->actual_length
 529                                         == urb->transfer_buffer_length) {
 530                                 if (usb_pipecontrol(urb->pipe))
 531                                         ep->nextpid = USB_PID_ACK;
 532
 533                                 /* some bulk protocols terminate OUT transfers
 534                                  * by a short packet, using ZLPs not padding.
 535                                  */
 536                                 else if (ep->length < ep->maxpacket
 537                                                 || !(urb->transfer_flags
 538                                                         & URB_ZERO_PACKET))
 539                                         urbstat = 0;
 540                         }
 541                         break;
 542                 case USB_PID_IN:
 543                         // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
 544                         buf = urb->transfer_buffer + urb->actual_length;
 545                         prefetchw(buf);
 546                         len = ep->maxpacket - sl811_read(sl811,
 547                                                 bank + SL11H_XFERCNTREG);
 548                         if (len > ep->length) {
 549                                 len = ep->length;
 550                                 urb->status = -EOVERFLOW;
 551                         }
 552                         urb->actual_length += len;
 553                         sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
 554                                         buf, len);
 555                         usb_dotoggle(udev, ep->epnum, 0);
 556                         if (urb->actual_length == urb->transfer_buffer_length)
 557                                 urbstat = 0;
 558                         else if (len < ep->maxpacket) {
 559                                 if (urb->transfer_flags & URB_SHORT_NOT_OK)
 560                                         urbstat = -EREMOTEIO;
 561                                 else
 562                                         urbstat = 0;
 563                         }
 564                         if (usb_pipecontrol(urb->pipe)
 565                                         && (urbstat == -EREMOTEIO
 566                                                 || urbstat == 0)) {
 567
 568                                 /* NOTE if the status stage STALLs (why?),
 569                                  * this reports the wrong urb status.
 570                                  */
 571                                 spin_lock(&urb->lock);
 572                                 if (urb->status == -EINPROGRESS)
 573                                         urb->status = urbstat;
 574                                 spin_unlock(&urb->lock);
 575
 576                                 urb = NULL;
 577                                 ep->nextpid = USB_PID_ACK;
 578                         }
 579                         break;
 580                 case USB_PID_SETUP:
 581                         // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
 582                         if (urb->transfer_buffer_length == urb->actual_length)
 583                                 ep->nextpid = USB_PID_ACK;
 584                         else if (usb_pipeout(urb->pipe)) {
 585                                 usb_settoggle(udev, 0, 1, 1);
 586                                 ep->nextpid = USB_PID_OUT;
 587                         } else {
 588                                 usb_settoggle(udev, 0, 0, 1);
 589                                 ep->nextpid = USB_PID_IN;
 590                         }
 591                         break;
 592                 case USB_PID_ACK:
 593                         // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
 594                         urbstat = 0;
 595                         break;
 596                 }
 597
 598         /* STALL stops all transfers */
 599         } else if (status & SL11H_STATMASK_STALL) {
 600                 PACKET("...STALL_%02x qh%p\n", bank, ep);
 601                 ep->nak_count = ep->error_count = 0;
 602                 urbstat = -EPIPE;
 603
 604         /* error? retry, until "3 strikes" */
 605         } else if (++ep->error_count >= 3) {
 606                 if (status & SL11H_STATMASK_TMOUT)
 607                         urbstat = -ETIMEDOUT;
 608                 else if (status & SL11H_STATMASK_OVF)
 609                         urbstat = -EOVERFLOW;
 610                 else
 611                         urbstat = -EPROTO;
 612                 ep->error_count = 0;
 613                 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
 614                                 bank, status, ep, urbstat);
 615         }
 616
 617         if (urb && (urbstat != -EINPROGRESS || urb->status != -EINPROGRESS))
 618                 finish_request(sl811, ep, urb, regs, urbstat);
 619 }
 620
 621 static inline u8 checkdone(struct sl811 *sl811)
 622 {
 623         u8      ctl;
 624         u8      irqstat = 0;
 625
 626         if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
 627                 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
 628                 if (ctl & SL11H_HCTLMASK_ARM)
 629                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 630                 DBG("%s DONE_A: ctrl %02x sts %02x\n",
 631                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 632                         ctl,
 633                         sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
 634                 irqstat |= SL11H_INTMASK_DONE_A;
 635         }
 636 #ifdef  USE_B
 637         if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
 638                 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
 639                 if (ctl & SL11H_HCTLMASK_ARM)
 640                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 641                 DBG("%s DONE_B: ctrl %02x sts %02x\n",
 642                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 643                         ctl,
 644                         sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
 645                 irqstat |= SL11H_INTMASK_DONE_A;
 646         }
 647 #endif
 648         return irqstat;
 649 }
 650
 651 static irqreturn_t sl811h_irq(struct usb_hcd *hcd, struct pt_regs *regs)
 652 {
 653         struct sl811    *sl811 = hcd_to_sl811(hcd);
 654         u8              irqstat;
 655         irqreturn_t     ret = IRQ_NONE;
 656         unsigned        retries = 5;
 657
 658         spin_lock(&sl811->lock);
 659
 660 retry:
 661         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
 662         if (irqstat) {
 663                 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
 664                 irqstat &= sl811->irq_enable;
 665         }
 666
 667 #ifdef  QUIRK2
 668         /* this may no longer be necessary ... */
 669         if (irqstat == 0) {
 670                 irqstat = checkdone(sl811);
 671                 if (irqstat)
 672                         sl811->stat_lost++;
 673         }
 674 #endif
 675
 676         /* USB packets, not necessarily handled in the order they're
 677          * issued ... that's fine if they're different endpoints.
 678          */
 679         if (irqstat & SL11H_INTMASK_DONE_A) {
 680                 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF), regs);
 681                 sl811->active_a = NULL;
 682                 sl811->stat_a++;
 683         }
 684 #ifdef USE_B
 685         if (irqstat & SL11H_INTMASK_DONE_B) {
 686                 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF), regs);
 687                 sl811->active_b = NULL;
 688                 sl811->stat_b++;
 689         }
 690 #endif
 691         if (irqstat & SL11H_INTMASK_SOFINTR) {
 692                 unsigned index;
 693
 694                 index = sl811->frame++ % (PERIODIC_SIZE - 1);
 695                 sl811->stat_sof++;
 696
 697                 /* be graceful about almost-inevitable periodic schedule
 698                  * overruns:  continue the previous frame's transfers iff
 699                  * this one has nothing scheduled.
 700                  */
 701                 if (sl811->next_periodic) {
 702                         // ERR("overrun to slot %d\n", index);
 703                         sl811->stat_overrun++;
 704                 }
 705                 if (sl811->periodic[index])
 706                         sl811->next_periodic = sl811->periodic[index];
 707         }
 708
 709         /* khubd manages debouncing and wakeup */
 710         if (irqstat & SL11H_INTMASK_INSRMV) {
 711                 sl811->stat_insrmv++;
 712
 713                 /* most stats are reset for each VBUS session */
 714                 sl811->stat_wake = 0;
 715                 sl811->stat_sof = 0;
 716                 sl811->stat_a = 0;
 717                 sl811->stat_b = 0;
 718                 sl811->stat_lost = 0;
 719
 720                 sl811->ctrl1 = 0;
 721                 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 722
 723                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
 724                 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 725
 726                 /* usbcore nukes other pending transactions on disconnect */
 727                 if (sl811->active_a) {
 728                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 729                         finish_request(sl811, sl811->active_a,
 730                                 container_of(sl811->active_a
 731                                                 ->hep->urb_list.next,
 732                                         struct urb, urb_list),
 733                                 NULL, -ESHUTDOWN);
 734                         sl811->active_a = NULL;
 735                 }
 736 #ifdef  USE_B
 737                 if (sl811->active_b) {
 738                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 739                         finish_request(sl811, sl811->active_b,
 740                                 container_of(sl811->active_b
 741                                                 ->hep->urb_list.next,
 742                                         struct urb, urb_list),
 743                                 NULL, -ESHUTDOWN);
 744                         sl811->active_b = NULL;
 745                 }
 746 #endif
 747
 748                 /* port status seems weird until after reset, so
 749                  * force the reset and make khubd clean up later.
 750                  */
 751                 sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
 752                                 | (1 << USB_PORT_FEAT_CONNECTION);
 753
 754         } else if (irqstat & SL11H_INTMASK_RD) {
 755                 if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)) {
 756                         DBG("wakeup\n");
 757                         sl811->port1 |= 1 << USB_PORT_FEAT_C_SUSPEND;
 758                         sl811->stat_wake++;
 759                 } else
 760                         irqstat &= ~SL11H_INTMASK_RD;
 761         }
 762
 763         if (irqstat) {
 764                 if (sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 765                         start_transfer(sl811);
 766                 ret = IRQ_HANDLED;
 767                 if (retries--)
 768                         goto retry;
 769         }
 770
 771         if (sl811->periodic_count == 0 && list_empty(&sl811->async))
 772                 sofirq_off(sl811);
 773         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 774
 775         spin_unlock(&sl811->lock);
 776
 777         return ret;
 778 }
 779
 780 /*-------------------------------------------------------------------------*/
 781
 782 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
 783  * this driver doesn't promise that much since it's got to handle an
 784  * IRQ per packet; irq handling latencies also use up that time.
 785  */
 786 #define MAX_PERIODIC_LOAD       500     /* out of 1000 usec */
 787
 788 static int balance(struct sl811 *sl811, u16 period, u16 load)
 789 {
 790         int     i, branch = -ENOSPC;
 791
 792         /* search for the least loaded schedule branch of that period
 793          * which has enough bandwidth left unreserved.
 794          */
 795         for (i = 0; i < period ; i++) {
 796                 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
 797                         int     j;
 798
 799                         for (j = i; j < PERIODIC_SIZE; j += period) {
 800                                 if ((sl811->load[j] + load)
 801                                                 > MAX_PERIODIC_LOAD)
 802                                         break;
 803                         }
 804                         if (j < PERIODIC_SIZE)
 805                                 continue;
 806                         branch = i;
 807                 }
 808         }
 809         return branch;
 810 }
 811
 812 /*-------------------------------------------------------------------------*/
 813
 814 static int sl811h_urb_enqueue(
 815         struct usb_hcd          *hcd,
 816         struct usb_host_endpoint *hep,
 817         struct urb              *urb,
 818         unsigned                mem_flags
 819 ) {
 820         struct sl811            *sl811 = hcd_to_sl811(hcd);
 821         struct usb_device       *udev = urb->dev;
 822         unsigned int            pipe = urb->pipe;
 823         int                     is_out = !usb_pipein(pipe);
 824         int                     type = usb_pipetype(pipe);
 825         int                     epnum = usb_pipeendpoint(pipe);
 826         struct sl811h_ep        *ep = NULL;
 827         unsigned long           flags;
 828         int                     i;
 829         int                     retval = 0;
 830
 831 #ifdef  DISABLE_ISO
 832         if (type == PIPE_ISOCHRONOUS)
 833                 return -ENOSPC;
 834 #endif
 835
 836         /* avoid all allocations within spinlocks */
 837         if (!hep->hcpriv)
 838                 ep = kcalloc(1, sizeof *ep, mem_flags);
 839
 840         spin_lock_irqsave(&sl811->lock, flags);
 841
 842         /* don't submit to a dead or disabled port */
 843         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 844                         || !HC_IS_RUNNING(hcd->state)) {
 845                 retval = -ENODEV;
 846                 goto fail;
 847         }
 848
 849         if (hep->hcpriv) {
 850                 kfree(ep);
 851                 ep = hep->hcpriv;
 852         } else if (!ep) {
 853                 retval = -ENOMEM;
 854                 goto fail;
 855
 856         } else {
 857                 INIT_LIST_HEAD(&ep->schedule);
 858                 ep->udev = usb_get_dev(udev);
 859                 ep->epnum = epnum;
 860                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
 861                 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
 862                 usb_settoggle(udev, epnum, is_out, 0);
 863
 864                 if (type == PIPE_CONTROL)
 865                         ep->nextpid = USB_PID_SETUP;
 866                 else if (is_out)
 867                         ep->nextpid = USB_PID_OUT;
 868                 else
 869                         ep->nextpid = USB_PID_IN;
 870
 871                 if (ep->maxpacket > H_MAXPACKET) {
 872                         /* iso packets up to 240 bytes could work... */
 873                         DBG("dev %d ep%d maxpacket %d\n",
 874                                 udev->devnum, epnum, ep->maxpacket);
 875                         retval = -EINVAL;
 876                         goto fail;
 877                 }
 878
 879                 if (udev->speed == USB_SPEED_LOW) {
 880                         /* send preamble for external hub? */
 881                         if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
 882                                 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
 883                 }
 884                 switch (type) {
 885                 case PIPE_ISOCHRONOUS:
 886                 case PIPE_INTERRUPT:
 887                         if (urb->interval > PERIODIC_SIZE)
 888                                 urb->interval = PERIODIC_SIZE;
 889                         ep->period = urb->interval;
 890                         ep->branch = PERIODIC_SIZE;
 891                         if (type == PIPE_ISOCHRONOUS)
 892                                 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
 893                         ep->load = usb_calc_bus_time(udev->speed, !is_out,
 894                                 (type == PIPE_ISOCHRONOUS),
 895                                 usb_maxpacket(udev, pipe, is_out))
 896                                         / 1000;
 897                         break;
 898                 }
 899
 900                 ep->hep = hep;
 901                 hep->hcpriv = ep;
 902         }
 903
 904         /* maybe put endpoint into schedule */
 905         switch (type) {
 906         case PIPE_CONTROL:
 907         case PIPE_BULK:
 908                 if (list_empty(&ep->schedule))
 909                         list_add_tail(&ep->schedule, &sl811->async);
 910                 break;
 911         case PIPE_ISOCHRONOUS:
 912         case PIPE_INTERRUPT:
 913                 urb->interval = ep->period;
 914                 if (ep->branch < PERIODIC_SIZE)
 915                         break;
 916
 917                 retval = balance(sl811, ep->period, ep->load);
 918                 if (retval < 0)
 919                         goto fail;
 920                 ep->branch = retval;
 921                 retval = 0;
 922                 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 923                                         + ep->branch;
 924
 925                 /* sort each schedule branch by period (slow before fast)
 926                  * to share the faster parts of the tree without needing
 927                  * dummy/placeholder nodes
 928                  */
 929                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 930                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 931                         struct sl811h_ep        **prev = &sl811->periodic[i];
 932                         struct sl811h_ep        *here = *prev;
 933
 934                         while (here && ep != here) {
 935                                 if (ep->period > here->period)
 936                                         break;
 937                                 prev = &here->next;
 938                                 here = *prev;
 939                         }
 940                         if (ep != here) {
 941                                 ep->next = here;
 942                                 *prev = ep;
 943                         }
 944                         sl811->load[i] += ep->load;
 945                 }
 946                 sl811->periodic_count++;
 947                 hcd->self.bandwidth_allocated += ep->load / ep->period;
 948                 sofirq_on(sl811);
 949         }
 950
 951         /* in case of unlink-during-submit */
 952         spin_lock(&urb->lock);
 953         if (urb->status != -EINPROGRESS) {
 954                 spin_unlock(&urb->lock);
 955                 finish_request(sl811, ep, urb, NULL, 0);
 956                 retval = 0;
 957                 goto fail;
 958         }
 959         urb->hcpriv = hep;
 960         spin_unlock(&urb->lock);
 961
 962         start_transfer(sl811);
 963         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 964 fail:
 965         spin_unlock_irqrestore(&sl811->lock, flags);
 966         return retval;
 967 }
 968
 969 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
 970 {
 971         struct sl811            *sl811 = hcd_to_sl811(hcd);
 972         struct usb_host_endpoint *hep;
 973         unsigned long           flags;
 974         struct sl811h_ep        *ep;
 975         int                     retval = 0;
 976
 977         spin_lock_irqsave(&sl811->lock, flags);
 978         hep = urb->hcpriv;
 979         if (!hep)
 980                 goto fail;
 981
 982         ep = hep->hcpriv;
 983         if (ep) {
 984                 /* finish right away if this urb can't be active ...
 985                  * note that some drivers wrongly expect delays
 986                  */
 987                 if (ep->hep->urb_list.next != &urb->urb_list) {
 988                         /* not front of queue?  never active */
 989
 990                 /* for active transfers, we expect an IRQ */
 991                 } else if (sl811->active_a == ep) {
 992                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
 993                                 /* happens a lot with lowspeed?? */
 994                                 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
 995                                         sl811_read(sl811,
 996                                                 SL811_EP_A(SL11H_HOSTCTLREG)),
 997                                         sl811_read(sl811,
 998                                                 SL811_EP_A(SL11H_PKTSTATREG)));
 999                                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1000                                                 0);
1001                                 sl811->active_a = NULL;
1002                         } else
1003                                 urb = NULL;
1004 #ifdef  USE_B
1005                 } else if (sl811->active_b == ep) {
1006                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
1007                                 /* happens a lot with lowspeed?? */
1008                                 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
1009                                         sl811_read(sl811,
1010                                                 SL811_EP_B(SL11H_HOSTCTLREG)),
1011                                         sl811_read(sl811,
1012                                                 SL811_EP_B(SL11H_PKTSTATREG)));
1013                                 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1014                                                 0);
1015                                 sl811->active_b = NULL;
1016                         } else
1017                                 urb = NULL;
1018 #endif
1019                 } else {
1020                         /* front of queue for inactive endpoint */
1021                 }
1022
1023                 if (urb)
1024                         finish_request(sl811, ep, urb, NULL, 0);
1025                 else
1026                         VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1027                                 (sl811->active_a == ep) ? "A" : "B");
1028         } else
1029 fail:
1030                 retval = -EINVAL;
1031         spin_unlock_irqrestore(&sl811->lock, flags);
1032         return retval;
1033 }
1034
1035 static void
1036 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1037 {
1038         struct sl811h_ep        *ep = hep->hcpriv;
1039
1040         if (!ep)
1041                 return;
1042
1043         /* assume we'd just wait for the irq */
1044         if (!list_empty(&hep->urb_list))
1045                 msleep(3);
1046         if (!list_empty(&hep->urb_list))
1047                 WARN("ep %p not empty?\n", ep);
1048
1049         usb_put_dev(ep->udev);
1050         kfree(ep);
1051         hep->hcpriv = NULL;
1052 }
1053
1054 static int
1055 sl811h_get_frame(struct usb_hcd *hcd)
1056 {
1057         struct sl811 *sl811 = hcd_to_sl811(hcd);
1058
1059         /* wrong except while periodic transfers are scheduled;
1060          * never matches the on-the-wire frame;
1061          * subject to overruns.
1062          */
1063         return sl811->frame;
1064 }
1065
1066
1067 /*-------------------------------------------------------------------------*/
1068
1069 /* the virtual root hub timer IRQ checks for hub status */
1070 static int
1071 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1072 {
1073         struct sl811 *sl811 = hcd_to_sl811(hcd);
1074 #ifdef  QUIRK3
1075         unsigned long flags;
1076
1077         /* non-SMP HACK: use root hub timer as i/o watchdog
1078          * this seems essential when SOF IRQs aren't in use...
1079          */
1080         local_irq_save(flags);
1081         if (!timer_pending(&sl811->timer)) {
1082                 if (sl811h_irq( /* ~0, */ hcd, NULL) != IRQ_NONE)
1083                         sl811->stat_lost++;
1084         }
1085         local_irq_restore(flags);
1086 #endif
1087
1088         if (!(sl811->port1 & (0xffff << 16)))
1089                 return 0;
1090
1091         /* tell khubd port 1 changed */
1092         *buf = (1 << 1);
1093         return 1;
1094 }
1095
1096 static void
1097 sl811h_hub_descriptor (
1098         struct sl811                    *sl811,
1099         struct usb_hub_descriptor       *desc
1100 ) {
1101         u16             temp = 0;
1102
1103         desc->bDescriptorType = 0x29;
1104         desc->bHubContrCurrent = 0;
1105
1106         desc->bNbrPorts = 1;
1107         desc->bDescLength = 9;
1108
1109         /* per-port power switching (gang of one!), or none */
1110         desc->bPwrOn2PwrGood = 0;
1111         if (sl811->board && sl811->board->port_power) {
1112                 desc->bPwrOn2PwrGood = sl811->board->potpg;
1113                 if (!desc->bPwrOn2PwrGood)
1114                         desc->bPwrOn2PwrGood = 10;
1115                 temp = 0x0001;
1116         } else
1117                 temp = 0x0002;
1118
1119         /* no overcurrent errors detection/handling */
1120         temp |= 0x0010;
1121
1122         desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
1123
1124         /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
1125         desc->bitmap[0] = 1 << 1;
1126         desc->bitmap[1] = ~0;
1127 }
1128
1129 static void
1130 sl811h_timer(unsigned long _sl811)
1131 {
1132         struct sl811    *sl811 = (void *) _sl811;
1133         unsigned long   flags;
1134         u8              irqstat;
1135         u8              signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1136         const u32       mask = (1 << USB_PORT_FEAT_CONNECTION)
1137                                 | (1 << USB_PORT_FEAT_ENABLE)
1138                                 | (1 << USB_PORT_FEAT_LOWSPEED);
1139
1140         spin_lock_irqsave(&sl811->lock, flags);
1141
1142         /* stop special signaling */
1143         sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1144         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1145         udelay(3);
1146
1147         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1148
1149         switch (signaling) {
1150         case SL11H_CTL1MASK_SE0:
1151                 DBG("end reset\n");
1152                 sl811->port1 = (1 << USB_PORT_FEAT_C_RESET)
1153                                 | (1 << USB_PORT_FEAT_POWER);
1154                 sl811->ctrl1 = 0;
1155                 /* don't wrongly ack RD */
1156                 if (irqstat & SL11H_INTMASK_INSRMV)
1157                         irqstat &= ~SL11H_INTMASK_RD;
1158                 break;
1159         case SL11H_CTL1MASK_K:
1160                 DBG("end resume\n");
1161                 sl811->port1 &= ~(1 << USB_PORT_FEAT_SUSPEND);
1162                 break;
1163         default:
1164                 DBG("odd timer signaling: %02x\n", signaling);
1165                 break;
1166         }
1167         sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1168
1169         if (irqstat & SL11H_INTMASK_RD) {
1170                 /* usbcore nukes all pending transactions on disconnect */
1171                 if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION))
1172                         sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
1173                                         | (1 << USB_PORT_FEAT_C_ENABLE);
1174                 sl811->port1 &= ~mask;
1175                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1176         } else {
1177                 sl811->port1 |= mask;
1178                 if (irqstat & SL11H_INTMASK_DP)
1179                         sl811->port1 &= ~(1 << USB_PORT_FEAT_LOWSPEED);
1180                 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1181         }
1182
1183         if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION)) {
1184                 u8      ctrl2 = SL811HS_CTL2_INIT;
1185
1186                 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1187 #ifdef USE_B
1188                 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1189 #endif
1190                 if (sl811->port1 & (1 << USB_PORT_FEAT_LOWSPEED)) {
1191                         sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1192                         ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1193                 }
1194
1195                 /* start SOFs flowing, kickstarting with A registers */
1196                 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1197                 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1198                 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1199
1200                 /* autoincrementing */
1201                 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1202                 writeb(SL_SOF, sl811->data_reg);
1203                 writeb(0, sl811->data_reg);
1204                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1205                                 SL11H_HCTLMASK_ARM);
1206
1207                 /* khubd provides debounce delay */
1208         } else {
1209                 sl811->ctrl1 = 0;
1210         }
1211         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1212
1213         /* reenable irqs */
1214         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1215         spin_unlock_irqrestore(&sl811->lock, flags);
1216 }
1217
1218 static int
1219 sl811h_hub_control(
1220         struct usb_hcd  *hcd,
1221         u16             typeReq,
1222         u16             wValue,
1223         u16             wIndex,
1224         char            *buf,
1225         u16             wLength
1226 ) {
1227         struct sl811    *sl811 = hcd_to_sl811(hcd);
1228         int             retval = 0;
1229         unsigned long   flags;
1230
1231         spin_lock_irqsave(&sl811->lock, flags);
1232
1233         switch (typeReq) {
1234         case ClearHubFeature:
1235         case SetHubFeature:
1236                 switch (wValue) {
1237                 case C_HUB_OVER_CURRENT:
1238                 case C_HUB_LOCAL_POWER:
1239                         break;
1240                 default:
1241                         goto error;
1242                 }
1243                 break;
1244         case ClearPortFeature:
1245                 if (wIndex != 1 || wLength != 0)
1246                         goto error;
1247
1248                 switch (wValue) {
1249                 case USB_PORT_FEAT_ENABLE:
1250                         sl811->port1 &= (1 << USB_PORT_FEAT_POWER);
1251                         sl811->ctrl1 = 0;
1252                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1253                         sl811->irq_enable = SL11H_INTMASK_INSRMV;
1254                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1255                                                 sl811->irq_enable);
1256                         break;
1257                 case USB_PORT_FEAT_SUSPEND:
1258                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)))
1259                                 break;
1260
1261                         /* 20 msec of resume/K signaling, other irqs blocked */
1262                         DBG("start resume...\n");
1263                         sl811->irq_enable = 0;
1264                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1265                                                 sl811->irq_enable);
1266                         sl811->ctrl1 |= SL11H_CTL1MASK_K;
1267                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1268
1269                         mod_timer(&sl811->timer, jiffies
1270                                         + msecs_to_jiffies(20));
1271                         break;
1272                 case USB_PORT_FEAT_POWER:
1273                         port_power(sl811, 0);
1274                         break;
1275                 case USB_PORT_FEAT_C_ENABLE:
1276                 case USB_PORT_FEAT_C_SUSPEND:
1277                 case USB_PORT_FEAT_C_CONNECTION:
1278                 case USB_PORT_FEAT_C_OVER_CURRENT:
1279                 case USB_PORT_FEAT_C_RESET:
1280                         break;
1281                 default:
1282                         goto error;
1283                 }
1284                 sl811->port1 &= ~(1 << wValue);
1285                 break;
1286         case GetHubDescriptor:
1287                 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1288                 break;
1289         case GetHubStatus:
1290                 *(__le32 *) buf = cpu_to_le32(0);
1291                 break;
1292         case GetPortStatus:
1293                 if (wIndex != 1)
1294                         goto error;
1295                 *(__le32 *) buf = cpu_to_le32(sl811->port1);
1296
1297 #ifndef VERBOSE
1298         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
1299 #endif
1300                 DBG("GetPortStatus %08x\n", sl811->port1);
1301                 break;
1302         case SetPortFeature:
1303                 if (wIndex != 1 || wLength != 0)
1304                         goto error;
1305                 switch (wValue) {
1306                 case USB_PORT_FEAT_SUSPEND:
1307                         if (sl811->port1 & (1 << USB_PORT_FEAT_RESET))
1308                                 goto error;
1309                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE)))
1310                                 goto error;
1311
1312                         DBG("suspend...\n");
1313                         sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1314                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1315                         break;
1316                 case USB_PORT_FEAT_POWER:
1317                         port_power(sl811, 1);
1318                         break;
1319                 case USB_PORT_FEAT_RESET:
1320                         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
1321                                 goto error;
1322                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_POWER)))
1323                                 break;
1324
1325                         /* 50 msec of reset/SE0 signaling, irqs blocked */
1326                         sl811->irq_enable = 0;
1327                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1328                                                 sl811->irq_enable);
1329                         sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1330                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1331                         sl811->port1 |= (1 << USB_PORT_FEAT_RESET);
1332                         mod_timer(&sl811->timer, jiffies
1333                                         + msecs_to_jiffies(50));
1334                         break;
1335                 default:
1336                         goto error;
1337                 }
1338                 sl811->port1 |= 1 << wValue;
1339                 break;
1340
1341         default:
1342 error:
1343                 /* "protocol stall" on error */
1344                 retval = -EPIPE;
1345         }
1346
1347         spin_unlock_irqrestore(&sl811->lock, flags);
1348         return retval;
1349 }
1350
1351 #ifdef  CONFIG_PM
1352
1353 static int
1354 sl811h_hub_suspend(struct usb_hcd *hcd)
1355 {
1356         // SOFs off
1357         DBG("%s\n", __FUNCTION__);
1358         return 0;
1359 }
1360
1361 static int
1362 sl811h_hub_resume(struct usb_hcd *hcd)
1363 {
1364         // SOFs on
1365         DBG("%s\n", __FUNCTION__);
1366         return 0;
1367 }
1368
1369 #else
1370
1371 #define sl811h_hub_suspend      NULL
1372 #define sl811h_hub_resume       NULL
1373
1374 #endif
1375
1376
1377 /*-------------------------------------------------------------------------*/
1378
1379 #ifdef STUB_DEBUG_FILE
1380
1381 static inline void create_debug_file(struct sl811 *sl811) { }
1382 static inline void remove_debug_file(struct sl811 *sl811) { }
1383
1384 #else
1385
1386 #include <linux/proc_fs.h>
1387 #include <linux/seq_file.h>
1388
1389 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1390 {
1391         seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1392                 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1393                 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1394                 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1395                 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1396                 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1397                 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1398 }
1399
1400 static int proc_sl811h_show(struct seq_file *s, void *unused)
1401 {
1402         struct sl811            *sl811 = s->private;
1403         struct sl811h_ep        *ep;
1404         unsigned                i;
1405
1406         seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1407                 sl811_to_hcd(sl811)->product_desc,
1408                 hcd_name, DRIVER_VERSION,
1409                 sl811->port1);
1410
1411         seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1412         seq_printf(s, "current session:  done_a %ld done_b %ld "
1413                         "wake %ld sof %ld overrun %ld lost %ld\n\n",
1414                 sl811->stat_a, sl811->stat_b,
1415                 sl811->stat_wake, sl811->stat_sof,
1416                 sl811->stat_overrun, sl811->stat_lost);
1417
1418         spin_lock_irq(&sl811->lock);
1419
1420         if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1421                 seq_printf(s, "(suspended)\n\n");
1422         else {
1423                 u8      t = sl811_read(sl811, SL11H_CTLREG1);
1424
1425                 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1426                         (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1427                         ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1428                         case SL11H_CTL1MASK_NORMAL: s = ""; break;
1429                         case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1430                         case SL11H_CTL1MASK_K: s = " k/resume"; break;
1431                         default: s = "j"; break;
1432                         }; s; }),
1433                         (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1434                         (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1435
1436                 dump_irq(s, "irq_enable",
1437                                 sl811_read(sl811, SL11H_IRQ_ENABLE));
1438                 dump_irq(s, "irq_status",
1439                                 sl811_read(sl811, SL11H_IRQ_STATUS));
1440                 seq_printf(s, "frame clocks remaining:  %d\n",
1441                                 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1442         }
1443
1444         seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1445                 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1446                 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1447         seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1448                 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1449                 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1450         seq_printf(s, "\n");
1451         list_for_each_entry (ep, &sl811->async, schedule) {
1452                 struct urb              *urb;
1453
1454                 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1455                                         " nak %d err %d\n",
1456                         (ep == sl811->active_a) ? "(A) " : "",
1457                         (ep == sl811->active_b) ? "(B) " : "",
1458                         ep, ep->epnum,
1459                         ({ char *s; switch (ep->nextpid) {
1460                         case USB_PID_IN: s = "in"; break;
1461                         case USB_PID_OUT: s = "out"; break;
1462                         case USB_PID_SETUP: s = "setup"; break;
1463                         case USB_PID_ACK: s = "status"; break;
1464                         default: s = "?"; break;
1465                         }; s;}),
1466                         ep->maxpacket,
1467                         ep->nak_count, ep->error_count);
1468                 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1469                         seq_printf(s, "  urb%p, %d/%d\n", urb,
1470                                 urb->actual_length,
1471                                 urb->transfer_buffer_length);
1472                 }
1473         }
1474         if (!list_empty(&sl811->async))
1475                 seq_printf(s, "\n");
1476
1477         seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1478
1479         for (i = 0; i < PERIODIC_SIZE; i++) {
1480                 ep = sl811->periodic[i];
1481                 if (!ep)
1482                         continue;
1483                 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1484
1485                 /* DUMB: prints shared entries multiple times */
1486                 do {
1487                         seq_printf(s,
1488                                 "   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1489                                         "err %d\n",
1490                                 (ep == sl811->active_a) ? "(A) " : "",
1491                                 (ep == sl811->active_b) ? "(B) " : "",
1492                                 ep->period, ep,
1493                                 (ep->udev->speed == USB_SPEED_FULL)
1494                                         ? "" : "ls ",
1495                                 ep->udev->devnum, ep->epnum,
1496                                 (ep->epnum == 0) ? ""
1497                                         : ((ep->nextpid == USB_PID_IN)
1498                                                 ? "in"
1499                                                 : "out"),
1500                                 ep->maxpacket, ep->error_count);
1501                         ep = ep->next;
1502                 } while (ep);
1503         }
1504
1505         spin_unlock_irq(&sl811->lock);
1506         seq_printf(s, "\n");
1507
1508         return 0;
1509 }
1510
1511 static int proc_sl811h_open(struct inode *inode, struct file *file)
1512 {
1513         return single_open(file, proc_sl811h_show, PDE(inode)->data);
1514 }
1515
1516 static struct file_operations proc_ops = {
1517         .open           = proc_sl811h_open,
1518         .read           = seq_read,
1519         .llseek         = seq_lseek,
1520         .release        = single_release,
1521 };
1522
1523 /* expect just one sl811 per system */
1524 static const char proc_filename[] = "driver/sl811h";
1525
1526 static void create_debug_file(struct sl811 *sl811)
1527 {
1528         struct proc_dir_entry *pde;
1529
1530         pde = create_proc_entry(proc_filename, 0, NULL);
1531         if (pde == NULL)
1532                 return;
1533
1534         pde->proc_fops = &proc_ops;
1535         pde->data = sl811;
1536         sl811->pde = pde;
1537 }
1538
1539 static void remove_debug_file(struct sl811 *sl811)
1540 {
1541         if (sl811->pde)
1542                 remove_proc_entry(proc_filename, NULL);
1543 }
1544
1545 #endif
1546
1547 /*-------------------------------------------------------------------------*/
1548
1549 static void
1550 sl811h_stop(struct usb_hcd *hcd)
1551 {
1552         struct sl811    *sl811 = hcd_to_sl811(hcd);
1553         unsigned long   flags;
1554
1555         del_timer_sync(&hcd->rh_timer);
1556
1557         spin_lock_irqsave(&sl811->lock, flags);
1558         port_power(sl811, 0);
1559         spin_unlock_irqrestore(&sl811->lock, flags);
1560 }
1561
1562 static int
1563 sl811h_start(struct usb_hcd *hcd)
1564 {
1565         struct sl811            *sl811 = hcd_to_sl811(hcd);
1566
1567         /* chip has been reset, VBUS power is off */
1568         hcd->state = HC_STATE_RUNNING;
1569
1570         if (sl811->board) {
1571                 hcd->can_wakeup = sl811->board->can_wakeup;
1572                 hcd->power_budget = sl811->board->power * 2;
1573         }
1574
1575         /* enable power and interupts */
1576         port_power(sl811, 1);
1577
1578         return 0;
1579 }
1580
1581 /*-------------------------------------------------------------------------*/
1582
1583 static struct hc_driver sl811h_hc_driver = {
1584         .description =          hcd_name,
1585         .hcd_priv_size =        sizeof(struct sl811),
1586
1587         /*
1588          * generic hardware linkage
1589          */
1590         .irq =                  sl811h_irq,
1591         .flags =                HCD_USB11 | HCD_MEMORY,
1592
1593         /* Basic lifecycle operations */
1594         .start =                sl811h_start,
1595         .stop =                 sl811h_stop,
1596
1597         /*
1598          * managing i/o requests and associated device resources
1599          */
1600         .urb_enqueue =          sl811h_urb_enqueue,
1601         .urb_dequeue =          sl811h_urb_dequeue,
1602         .endpoint_disable =     sl811h_endpoint_disable,
1603
1604         /*
1605          * periodic schedule support
1606          */
1607         .get_frame_number =     sl811h_get_frame,
1608
1609         /*
1610          * root hub support
1611          */
1612         .hub_status_data =      sl811h_hub_status_data,
1613         .hub_control =          sl811h_hub_control,
1614         .hub_suspend =          sl811h_hub_suspend,
1615         .hub_resume =           sl811h_hub_resume,
1616 };
1617
1618 /*-------------------------------------------------------------------------*/
1619
1620 static int __devexit
1621 sl811h_remove(struct device *dev)
1622 {
1623         struct usb_hcd          *hcd = dev_get_drvdata(dev);
1624         struct sl811            *sl811 = hcd_to_sl811(hcd);
1625         struct platform_device  *pdev;
1626         struct resource         *res;
1627
1628         pdev = container_of(dev, struct platform_device, dev);
1629
1630         remove_debug_file(sl811);
1631         usb_remove_hcd(hcd);
1632
1633         /* some platforms may use IORESOURCE_IO */
1634         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1635         if (res)
1636                 iounmap(sl811->data_reg);
1637
1638         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1639         if (res)
1640                 iounmap(sl811->addr_reg);
1641
1642         usb_put_hcd(hcd);
1643         return 0;
1644 }
1645
1646 static int __devinit
1647 sl811h_probe(struct device *dev)
1648 {
1649         struct usb_hcd          *hcd;
1650         struct sl811            *sl811;
1651         struct platform_device  *pdev;
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         pdev = container_of(dev, struct platform_device, dev);
1665         irq = platform_get_irq(pdev, 0);
1666         if (pdev->num_resources < 3 || irq < 0)
1667                 return -ENODEV;
1668
1669         /* refuse to confuse usbcore */
1670         if (dev->dma_mask) {
1671                 DBG("no we won't dma\n");
1672                 return -EINVAL;
1673         }
1674
1675         /* the chip may be wired for either kind of addressing */
1676         addr = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1677         data = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1678         retval = -EBUSY;
1679         if (!addr || !data) {
1680                 addr = platform_get_resource(pdev, IORESOURCE_IO, 0);
1681                 data = platform_get_resource(pdev, IORESOURCE_IO, 1);
1682                 if (!addr || !data)
1683                         return -ENODEV;
1684                 ioaddr = 1;
1685
1686                 addr_reg = (void __iomem *) addr->start;
1687                 data_reg = (void __iomem *) data->start;
1688         } else {
1689                 addr_reg = ioremap(addr->start, 1);
1690                 if (addr_reg == NULL) {
1691                         retval = -ENOMEM;
1692                         goto err2;
1693                 }
1694
1695                 data_reg = ioremap(data->start, 1);
1696                 if (data_reg == NULL) {
1697                         retval = -ENOMEM;
1698                         goto err4;
1699                 }
1700         }
1701
1702         /* allocate and initialize hcd */
1703         hcd = usb_create_hcd(&sl811h_hc_driver, dev, dev->bus_id);
1704         if (!hcd) {
1705                 retval = -ENOMEM;
1706                 goto err5;
1707         }
1708         hcd->rsrc_start = addr->start;
1709         sl811 = hcd_to_sl811(hcd);
1710
1711         spin_lock_init(&sl811->lock);
1712         INIT_LIST_HEAD(&sl811->async);
1713         sl811->board = dev->platform_data;
1714         init_timer(&sl811->timer);
1715         sl811->timer.function = sl811h_timer;
1716         sl811->timer.data = (unsigned long) sl811;
1717         sl811->addr_reg = addr_reg;
1718         sl811->data_reg = data_reg;
1719
1720         spin_lock_irq(&sl811->lock);
1721         port_power(sl811, 0);
1722         spin_unlock_irq(&sl811->lock);
1723         msleep(200);
1724
1725         tmp = sl811_read(sl811, SL11H_HWREVREG);
1726         switch (tmp >> 4) {
1727         case 1:
1728                 hcd->product_desc = "SL811HS v1.2";
1729                 break;
1730         case 2:
1731                 hcd->product_desc = "SL811HS v1.5";
1732                 break;
1733         default:
1734                 /* reject case 0, SL11S is less functional */
1735                 DBG("chiprev %02x\n", tmp);
1736                 retval = -ENXIO;
1737                 goto err6;
1738         }
1739
1740         /* The chip's IRQ is level triggered, active high.  A requirement
1741          * for platform device setup is to cope with things like signal
1742          * inverters (e.g. CF is active low) or working only with edge
1743          * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1744          * was on a system with single edge triggering, so most sorts of
1745          * triggering arrangement should work.
1746          */
1747         retval = usb_add_hcd(hcd, irq, SA_INTERRUPT | SA_SHIRQ);
1748         if (retval != 0)
1749                 goto err6;
1750
1751         create_debug_file(sl811);
1752         return retval;
1753
1754  err6:
1755         usb_put_hcd(hcd);
1756  err5:
1757         if (!ioaddr)
1758                 iounmap(data_reg);
1759  err4:
1760         if (!ioaddr)
1761                 iounmap(addr_reg);
1762  err2:
1763         DBG("init error, %d\n", retval);
1764         return retval;
1765 }
1766
1767 #ifdef  CONFIG_PM
1768
1769 /* for this device there's no useful distinction between the controller
1770  * and its root hub, except that the root hub only gets direct PM calls
1771  * when CONFIG_USB_SUSPEND is enabled.
1772  */
1773
1774 static int
1775 sl811h_suspend(struct device *dev, pm_message_t state, u32 phase)
1776 {
1777         struct usb_hcd  *hcd = dev_get_drvdata(dev);
1778         struct sl811    *sl811 = hcd_to_sl811(hcd);
1779         int             retval = 0;
1780
1781         if (phase != SUSPEND_POWER_DOWN)
1782                 return retval;
1783
1784         if (state.event == PM_EVENT_FREEZE)
1785                 retval = sl811h_hub_suspend(hcd);
1786         else if (state.event == PM_EVENT_SUSPEND)
1787                 port_power(sl811, 0);
1788         if (retval == 0)
1789                 dev->power.power_state = state;
1790         return retval;
1791 }
1792
1793 static int
1794 sl811h_resume(struct device *dev, u32 phase)
1795 {
1796         struct usb_hcd  *hcd = dev_get_drvdata(dev);
1797         struct sl811    *sl811 = hcd_to_sl811(hcd);
1798
1799         if (phase != RESUME_POWER_ON)
1800                 return 0;
1801
1802         /* with no "check to see if VBUS is still powered" board hook,
1803          * let's assume it'd only be powered to enable remote wakeup.
1804          */
1805         if (dev->power.power_state.event == PM_EVENT_SUSPEND
1806                         || !hcd->can_wakeup) {
1807                 sl811->port1 = 0;
1808                 port_power(sl811, 1);
1809                 return 0;
1810         }
1811
1812         dev->power.power_state = PMSG_ON;
1813         return sl811h_hub_resume(hcd);
1814 }
1815
1816 #else
1817
1818 #define sl811h_suspend  NULL
1819 #define sl811h_resume   NULL
1820
1821 #endif
1822
1823
1824 /* this driver is exported so sl811_cs can depend on it */
1825 struct device_driver sl811h_driver = {
1826         .name =         (char *) hcd_name,
1827         .bus =          &platform_bus_type,
1828
1829         .probe =        sl811h_probe,
1830         .remove =       __devexit_p(sl811h_remove),
1831
1832         .suspend =      sl811h_suspend,
1833         .resume =       sl811h_resume,
1834 };
1835 EXPORT_SYMBOL(sl811h_driver);
1836
1837 /*-------------------------------------------------------------------------*/
1838
1839 static int __init sl811h_init(void)
1840 {
1841         if (usb_disabled())
1842                 return -ENODEV;
1843
1844         INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1845         return driver_register(&sl811h_driver);
1846 }
1847 module_init(sl811h_init);
1848
1849 static void __exit sl811h_cleanup(void)
1850 {
1851         driver_unregister(&sl811h_driver);
1852 }
1853 module_exit(sl811h_cleanup);