drivers/staging/ozwpan/ozhcd.c

   1 /* -----------------------------------------------------------------------------
   2  * Copyright (c) 2011 Ozmo Inc
   3  * Released under the GNU General Public License Version 2 (GPLv2).
   4  *
   5  * This file provides the implementation of a USB host controller device that
   6  * does not have any associated hardware. Instead the virtual device is
   7  * connected to the WiFi network and emulates the operation of a USB hcd by
   8  * receiving and sending network frames.
   9  * Note:
  10  * We take great pains to reduce the amount of code where interrupts need to be
  11  * disabled and in this respect we are different from standard HCD's. In
  12  * particular we don't want in_irq() code bleeding over to the protocol side of
  13  * the driver.
  14  * The troublesome functions are the urb enqueue and dequeue functions both of
  15  * which can be called in_irq(). So for these functions we put the urbs into a
  16  * queue and request a tasklet to process them. This means that a spinlock with
  17  * interrupts disabled must be held for insertion and removal but most code is
  18  * is in tasklet or soft irq context. The lock that protects this list is called
  19  * the tasklet lock and serves the purpose of the 'HCD lock' which must be held
  20  * when calling the following functions.
  21  *   usb_hcd_link_urb_to_ep()
  22  *   usb_hcd_unlink_urb_from_ep()
  23  *   usb_hcd_flush_endpoint()
  24  *   usb_hcd_check_unlink_urb()
  25  * -----------------------------------------------------------------------------
  26  */
  27 #include <linux/platform_device.h>
  28 #include <linux/usb.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/slab.h>
  31 #include <linux/export.h>
  32 #include "linux/usb/hcd.h"
  33 #include <asm/unaligned.h>
  34 #include "ozconfig.h"
  35 #include "ozusbif.h"
  36 #include "oztrace.h"
  37 #include "ozurbparanoia.h"
  38 #include "ozevent.h"
  39 #include "ozhcd.h"
  40 /*------------------------------------------------------------------------------
  41  * Number of units of buffering to capture for an isochronous IN endpoint before
  42  * allowing data to be indicated up.
  43  */
  44 #define OZ_IN_BUFFERING_UNITS   50
  45 /* Name of our platform device.
  46  */
  47 #define OZ_PLAT_DEV_NAME        "ozwpan"
  48 /* Maximum number of free urb links that can be kept in the pool.
  49  */
  50 #define OZ_MAX_LINK_POOL_SIZE   16
  51 /* Get endpoint object from the containing link.
  52  */
  53 #define ep_from_link(__e) container_of((__e), struct oz_endpoint, link)
  54 /*------------------------------------------------------------------------------
  55  * Used to link urbs together and also store some status information for each
  56  * urb.
  57  * A cache of these are kept in a pool to reduce number of calls to kmalloc.
  58  */
  59 struct oz_urb_link {
  60         struct list_head link;
  61         struct urb *urb;
  62         struct oz_port *port;
  63         u8 req_id;
  64         u8 ep_num;
  65         unsigned long submit_jiffies;
  66 };
  67
  68 /* Holds state information about a USB endpoint.
  69  */
  70 struct oz_endpoint {
  71         struct list_head urb_list;      /* List of oz_urb_link items. */
  72         struct list_head link;          /* For isoc ep, links in to isoc
  73                                            lists of oz_port. */
  74         unsigned long last_jiffies;
  75         int credit;
  76         int credit_ceiling;
  77         u8 ep_num;
  78         u8 attrib;
  79         u8 *buffer;
  80         int buffer_size;
  81         int in_ix;
  82         int out_ix;
  83         int buffered_units;
  84         unsigned flags;
  85         int start_frame;
  86 };
  87 /* Bits in the flags field. */
  88 #define OZ_F_EP_BUFFERING       0x1
  89 #define OZ_F_EP_HAVE_STREAM     0x2
  90
  91 /* Holds state information about a USB interface.
  92  */
  93 struct oz_interface {
  94         unsigned ep_mask;
  95         u8 alt;
  96 };
  97
  98 /* Holds state information about an hcd port.
  99  */
 100 #define OZ_NB_ENDPOINTS 16
 101 struct oz_port {
 102         unsigned flags;
 103         unsigned status;
 104         void *hpd;
 105         struct oz_hcd *ozhcd;
 106         spinlock_t port_lock;
 107         u8 bus_addr;
 108         u8 next_req_id;
 109         u8 config_num;
 110         int num_iface;
 111         struct oz_interface *iface;
 112         struct oz_endpoint *out_ep[OZ_NB_ENDPOINTS];
 113         struct oz_endpoint *in_ep[OZ_NB_ENDPOINTS];
 114         struct list_head isoc_out_ep;
 115         struct list_head isoc_in_ep;
 116 };
 117 #define OZ_PORT_F_PRESENT       0x1
 118 #define OZ_PORT_F_CHANGED       0x2
 119 #define OZ_PORT_F_DYING         0x4
 120
 121 /* Data structure in the private context area of struct usb_hcd.
 122  */
 123 #define OZ_NB_PORTS     8
 124 struct oz_hcd {
 125         spinlock_t hcd_lock;
 126         struct list_head urb_pending_list;
 127         struct list_head urb_cancel_list;
 128         struct list_head orphanage;
 129         int conn_port; /* Port that is currently connecting, -1 if none.*/
 130         struct oz_port ports[OZ_NB_PORTS];
 131         uint flags;
 132         struct usb_hcd *hcd;
 133 };
 134 /* Bits in flags field.
 135  */
 136 #define OZ_HDC_F_SUSPENDED      0x1
 137
 138 /*------------------------------------------------------------------------------
 139  * Static function prototypes.
 140  */
 141 static int oz_hcd_start(struct usb_hcd *hcd);
 142 static void oz_hcd_stop(struct usb_hcd *hcd);
 143 static void oz_hcd_shutdown(struct usb_hcd *hcd);
 144 static int oz_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 145                                 gfp_t mem_flags);
 146 static int oz_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
 147 static void oz_hcd_endpoint_disable(struct usb_hcd *hcd,
 148                                 struct usb_host_endpoint *ep);
 149 static void oz_hcd_endpoint_reset(struct usb_hcd *hcd,
 150                                 struct usb_host_endpoint *ep);
 151 static int oz_hcd_get_frame_number(struct usb_hcd *hcd);
 152 static int oz_hcd_hub_status_data(struct usb_hcd *hcd, char *buf);
 153 static int oz_hcd_hub_control(struct usb_hcd *hcd, u16 req_type, u16 wvalue,
 154                                 u16 windex, char *buf, u16 wlength);
 155 static int oz_hcd_bus_suspend(struct usb_hcd *hcd);
 156 static int oz_hcd_bus_resume(struct usb_hcd *hcd);
 157 static int oz_plat_probe(struct platform_device *dev);
 158 static int oz_plat_remove(struct platform_device *dev);
 159 static void oz_plat_shutdown(struct platform_device *dev);
 160 static int oz_plat_suspend(struct platform_device *dev, pm_message_t msg);
 161 static int oz_plat_resume(struct platform_device *dev);
 162 static void oz_urb_process_tasklet(unsigned long unused);
 163 static int oz_build_endpoints_for_config(struct usb_hcd *hcd,
 164                 struct oz_port *port, struct usb_host_config *config,
 165                 gfp_t mem_flags);
 166 static void oz_clean_endpoints_for_config(struct usb_hcd *hcd,
 167                                 struct oz_port *port);
 168 static int oz_build_endpoints_for_interface(struct usb_hcd *hcd,
 169                         struct oz_port *port,
 170                         struct usb_host_interface *intf, gfp_t mem_flags);
 171 static void oz_clean_endpoints_for_interface(struct usb_hcd *hcd,
 172                         struct oz_port *port, int if_ix);
 173 static void oz_process_ep0_urb(struct oz_hcd *ozhcd, struct urb *urb,
 174                 gfp_t mem_flags);
 175 static struct oz_urb_link *oz_remove_urb(struct oz_endpoint *ep,
 176                 struct urb *urb);
 177 static void oz_hcd_clear_orphanage(struct oz_hcd *ozhcd, int status);
 178 /*------------------------------------------------------------------------------
 179  * Static external variables.
 180  */
 181 static struct platform_device *g_plat_dev;
 182 static struct oz_hcd *g_ozhcd;
 183 static DEFINE_SPINLOCK(g_hcdlock);      /* Guards g_ozhcd. */
 184 static const char g_hcd_name[] = "Ozmo WPAN";
 185 static struct list_head *g_link_pool;
 186 static int g_link_pool_size;
 187 static DEFINE_SPINLOCK(g_link_lock);
 188 static DEFINE_SPINLOCK(g_tasklet_lock);
 189 static struct tasklet_struct g_urb_process_tasklet;
 190 static struct tasklet_struct g_urb_cancel_tasklet;
 191 static atomic_t g_pending_urbs = ATOMIC_INIT(0);
 192 static const struct hc_driver g_oz_hc_drv = {
 193         .description =          g_hcd_name,
 194         .product_desc =         "Ozmo Devices WPAN",
 195         .hcd_priv_size =        sizeof(struct oz_hcd),
 196         .flags =                HCD_USB11,
 197         .start =                oz_hcd_start,
 198         .stop =                 oz_hcd_stop,
 199         .shutdown =             oz_hcd_shutdown,
 200         .urb_enqueue =          oz_hcd_urb_enqueue,
 201         .urb_dequeue =          oz_hcd_urb_dequeue,
 202         .endpoint_disable =     oz_hcd_endpoint_disable,
 203         .endpoint_reset =       oz_hcd_endpoint_reset,
 204         .get_frame_number =     oz_hcd_get_frame_number,
 205         .hub_status_data =      oz_hcd_hub_status_data,
 206         .hub_control =          oz_hcd_hub_control,
 207         .bus_suspend =          oz_hcd_bus_suspend,
 208         .bus_resume =           oz_hcd_bus_resume,
 209 };
 210
 211 static struct platform_driver g_oz_plat_drv = {
 212         .probe = oz_plat_probe,
 213         .remove = oz_plat_remove,
 214         .shutdown = oz_plat_shutdown,
 215         .suspend = oz_plat_suspend,
 216         .resume = oz_plat_resume,
 217         .driver = {
 218                 .name = OZ_PLAT_DEV_NAME,
 219                 .owner = THIS_MODULE,
 220         },
 221 };
 222 /*------------------------------------------------------------------------------
 223  * Gets our private context area (which is of type struct oz_hcd) from the
 224  * usb_hcd structure.
 225  * Context: any
 226  */
 227 static inline struct oz_hcd *oz_hcd_private(struct usb_hcd *hcd)
 228 {
 229         return (struct oz_hcd *)hcd->hcd_priv;
 230 }
 231 /*------------------------------------------------------------------------------
 232  * Searches list of ports to find the index of the one with a specified  USB
 233  * bus address. If none of the ports has the bus address then the connection
 234  * port is returned, if there is one or -1 otherwise.
 235  * Context: any
 236  */
 237 static int oz_get_port_from_addr(struct oz_hcd *ozhcd, u8 bus_addr)
 238 {
 239         int i;
 240         for (i = 0; i < OZ_NB_PORTS; i++) {
 241                 if (ozhcd->ports[i].bus_addr == bus_addr)
 242                         return i;
 243         }
 244         return ozhcd->conn_port;
 245 }
 246 /*------------------------------------------------------------------------------
 247  * Allocates an urb link, first trying the pool but going to heap if empty.
 248  * Context: any
 249  */
 250 static struct oz_urb_link *oz_alloc_urb_link(void)
 251 {
 252         struct oz_urb_link *urbl = NULL;
 253         unsigned long irq_state;
 254         spin_lock_irqsave(&g_link_lock, irq_state);
 255         if (g_link_pool) {
 256                 urbl = container_of(g_link_pool, struct oz_urb_link, link);
 257                 g_link_pool = urbl->link.next;
 258                 --g_link_pool_size;
 259         }
 260         spin_unlock_irqrestore(&g_link_lock, irq_state);
 261         if (urbl == NULL)
 262                 urbl = kmalloc(sizeof(struct oz_urb_link), GFP_ATOMIC);
 263         return urbl;
 264 }
 265 /*------------------------------------------------------------------------------
 266  * Frees an urb link by putting it in the pool if there is enough space or
 267  * deallocating it to heap otherwise.
 268  * Context: any
 269  */
 270 static void oz_free_urb_link(struct oz_urb_link *urbl)
 271 {
 272         if (urbl) {
 273                 unsigned long irq_state;
 274                 spin_lock_irqsave(&g_link_lock, irq_state);
 275                 if (g_link_pool_size < OZ_MAX_LINK_POOL_SIZE) {
 276                         urbl->link.next = g_link_pool;
 277                         g_link_pool = &urbl->link;
 278                         urbl = NULL;
 279                         g_link_pool_size++;
 280                 }
 281                 spin_unlock_irqrestore(&g_link_lock, irq_state);
 282                 kfree(urbl);
 283         }
 284 }
 285 /*------------------------------------------------------------------------------
 286  * Deallocates all the urb links in the pool.
 287  * Context: unknown
 288  */
 289 static void oz_empty_link_pool(void)
 290 {
 291         struct list_head *e;
 292         unsigned long irq_state;
 293         spin_lock_irqsave(&g_link_lock, irq_state);
 294         e = g_link_pool;
 295         g_link_pool = NULL;
 296         g_link_pool_size = 0;
 297         spin_unlock_irqrestore(&g_link_lock, irq_state);
 298         while (e) {
 299                 struct oz_urb_link *urbl =
 300                         container_of(e, struct oz_urb_link, link);
 301                 e = e->next;
 302                 kfree(urbl);
 303         }
 304 }
 305 /*------------------------------------------------------------------------------
 306  * Allocates endpoint structure and optionally a buffer. If a buffer is
 307  * allocated it immediately follows the endpoint structure.
 308  * Context: softirq
 309  */
 310 static struct oz_endpoint *oz_ep_alloc(gfp_t mem_flags, int buffer_size)
 311 {
 312         struct oz_endpoint *ep =
 313                 kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
 314         if (ep) {
 315                 INIT_LIST_HEAD(&ep->urb_list);
 316                 INIT_LIST_HEAD(&ep->link);
 317                 ep->credit = -1;
 318                 if (buffer_size) {
 319                         ep->buffer_size = buffer_size;
 320                         ep->buffer = (u8 *)(ep+1);
 321                 }
 322         }
 323         return ep;
 324 }
 325 /*------------------------------------------------------------------------------
 326  * Pre-condition: Must be called with g_tasklet_lock held and interrupts
 327  * disabled.
 328  * Context: softirq or process
 329  */
 330 struct oz_urb_link *oz_uncancel_urb(struct oz_hcd *ozhcd, struct urb *urb)
 331 {
 332         struct oz_urb_link *urbl;
 333         struct list_head *e;
 334         list_for_each(e, &ozhcd->urb_cancel_list) {
 335                 urbl = container_of(e, struct oz_urb_link, link);
 336                 if (urb == urbl->urb) {
 337                         list_del_init(e);
 338                         return urbl;
 339                 }
 340         }
 341         return NULL;
 342 }
 343 /*------------------------------------------------------------------------------
 344  * This is called when we have finished processing an urb. It unlinks it from
 345  * the ep and returns it to the core.
 346  * Context: softirq or process
 347  */
 348 static void oz_complete_urb(struct usb_hcd *hcd, struct urb *urb,
 349                 int status, unsigned long submit_jiffies)
 350 {
 351         struct oz_hcd *ozhcd = oz_hcd_private(hcd);
 352         unsigned long irq_state;
 353         struct oz_urb_link *cancel_urbl = NULL;
 354         spin_lock_irqsave(&g_tasklet_lock, irq_state);
 355         usb_hcd_unlink_urb_from_ep(hcd, urb);
 356         /* Clear hcpriv which will prevent it being put in the cancel list
 357          * in the event that an attempt is made to cancel it.
 358          */
 359         urb->hcpriv = NULL;
 360         /* Walk the cancel list in case the urb is already sitting there.
 361          * Since we process the cancel list in a tasklet rather than in
 362          * the dequeue function this could happen.
 363          */
 364         cancel_urbl = oz_uncancel_urb(ozhcd, urb);
 365         /* Note: we release lock but do not enable local irqs.
 366          * It appears that usb_hcd_giveback_urb() expects irqs to be disabled,
 367          * or at least other host controllers disable interrupts at this point
 368          * so we do the same. We must, however, release the lock otherwise a
 369          * deadlock will occur if an urb is submitted to our driver in the urb
 370          * completion function. Because we disable interrupts it is possible
 371          * that the urb_enqueue function can be called with them disabled.
 372          */
 373         spin_unlock(&g_tasklet_lock);
 374         if (oz_forget_urb(urb)) {
 375                 oz_trace("OZWPAN: ERROR Unknown URB %p\n", urb);
 376         } else {
 377                 static unsigned long last_time;
 378                 atomic_dec(&g_pending_urbs);
 379                 oz_trace2(OZ_TRACE_URB,
 380                         "%lu: giveback_urb(%p,%x) %lu %lu pending:%d\n",
 381                         jiffies, urb, status, jiffies-submit_jiffies,
 382                         jiffies-last_time, atomic_read(&g_pending_urbs));
 383                 last_time = jiffies;
 384                 oz_event_log(OZ_EVT_URB_DONE, 0, 0, urb, status);
 385                 usb_hcd_giveback_urb(hcd, urb, status);
 386         }
 387         spin_lock(&g_tasklet_lock);
 388         spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
 389         if (cancel_urbl)
 390                 oz_free_urb_link(cancel_urbl);
 391 }
 392 /*------------------------------------------------------------------------------
 393  * Deallocates an endpoint including deallocating any associated stream and
 394  * returning any queued urbs to the core.
 395  * Context: softirq
 396  */
 397 static void oz_ep_free(struct oz_port *port, struct oz_endpoint *ep)
 398 {
 399         oz_trace("oz_ep_free()\n");
 400         if (port) {
 401                 struct list_head list;
 402                 struct oz_hcd *ozhcd = port->ozhcd;
 403                 INIT_LIST_HEAD(&list);
 404                 if (ep->flags & OZ_F_EP_HAVE_STREAM)
 405                         oz_usb_stream_delete(port->hpd, ep->ep_num);
 406                 /* Transfer URBs to the orphanage while we hold the lock. */
 407                 spin_lock_bh(&ozhcd->hcd_lock);
 408                 /* Note: this works even if ep->urb_list is empty.*/
 409                 list_replace_init(&ep->urb_list, &list);
 410                 /* Put the URBs in the orphanage. */
 411                 list_splice_tail(&list, &ozhcd->orphanage);
 412                 spin_unlock_bh(&ozhcd->hcd_lock);
 413         }
 414         oz_trace("Freeing endpoint memory\n");
 415         kfree(ep);
 416 }
 417 /*------------------------------------------------------------------------------
 418  * Context: softirq
 419  */
 420 void oz_complete_buffered_urb(struct oz_port *port, struct oz_endpoint *ep,
 421                         struct urb *urb)
 422 {
 423         u8 data_len, available_space, copy_len;
 424
 425         memcpy(&data_len, &ep->buffer[ep->out_ix], sizeof(u8));
 426         if (data_len <= urb->transfer_buffer_length)
 427                 available_space = data_len;
 428         else
 429                 available_space = urb->transfer_buffer_length;
 430
 431         if (++ep->out_ix == ep->buffer_size)
 432                 ep->out_ix = 0;
 433         copy_len = ep->buffer_size - ep->out_ix;
 434         if (copy_len >= available_space)
 435                 copy_len = available_space;
 436         memcpy(urb->transfer_buffer, &ep->buffer[ep->out_ix], copy_len);
 437
 438         if (copy_len < available_space) {
 439                 memcpy((urb->transfer_buffer + copy_len), ep->buffer,
 440                                                 (available_space - copy_len));
 441                 ep->out_ix = available_space - copy_len;
 442         } else {
 443                 ep->out_ix += copy_len;
 444         }
 445         urb->actual_length = available_space;
 446         if (ep->out_ix == ep->buffer_size)
 447                 ep->out_ix = 0;
 448
 449         ep->buffered_units--;
 450         oz_trace("Trying to give back buffered frame of size=%d\n",
 451                                                 available_space);
 452         oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
 453 }
 454
 455 /*------------------------------------------------------------------------------
 456  * Context: softirq
 457  */
 458 static int oz_enqueue_ep_urb(struct oz_port *port, u8 ep_addr, int in_dir,
 459                         struct urb *urb, u8 req_id)
 460 {
 461         struct oz_urb_link *urbl;
 462         struct oz_endpoint *ep;
 463         int err = 0;
 464         if (ep_addr >= OZ_NB_ENDPOINTS) {
 465                 oz_trace("Invalid endpoint number in oz_enqueue_ep_urb().\n");
 466                 return -EINVAL;
 467         }
 468         urbl = oz_alloc_urb_link();
 469         if (!urbl)
 470                 return -ENOMEM;
 471         urbl->submit_jiffies = jiffies;
 472         urbl->urb = urb;
 473         urbl->req_id = req_id;
 474         urbl->ep_num = ep_addr;
 475         /* Hold lock while we insert the URB into the list within the
 476          * endpoint structure.
 477          */
 478         spin_lock_bh(&port->ozhcd->hcd_lock);
 479         /* If the urb has been unlinked while out of any list then
 480          * complete it now.
 481          */
 482         if (urb->unlinked) {
 483                 spin_unlock_bh(&port->ozhcd->hcd_lock);
 484                 oz_trace("urb %p unlinked so complete immediately\n", urb);
 485                 oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
 486                 oz_free_urb_link(urbl);
 487                 return 0;
 488         }
 489         if (in_dir)
 490                 ep = port->in_ep[ep_addr];
 491         else
 492                 ep = port->out_ep[ep_addr];
 493
 494         /*For interrupt endpoint check for buffered data
 495         * & complete urb
 496         */
 497         if (((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)
 498                                                  && ep->buffered_units > 0) {
 499                 oz_free_urb_link(urbl);
 500                 spin_unlock_bh(&port->ozhcd->hcd_lock);
 501                 oz_complete_buffered_urb(port, ep, urb);
 502                 return 0;
 503         }
 504
 505         if (ep && port->hpd) {
 506                 list_add_tail(&urbl->link, &ep->urb_list);
 507                 if (!in_dir && ep_addr && (ep->credit < 0)) {
 508                         ep->last_jiffies = jiffies;
 509                         ep->credit = 0;
 510                         oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num,
 511                                         0, NULL, ep->credit);
 512                 }
 513         } else {
 514                 err = -EPIPE;
 515         }
 516         spin_unlock_bh(&port->ozhcd->hcd_lock);
 517         if (err)
 518                 oz_free_urb_link(urbl);
 519         return err;
 520 }
 521 /*------------------------------------------------------------------------------
 522  * Removes an urb from the queue in the endpoint.
 523  * Returns 0 if it is found and -EIDRM otherwise.
 524  * Context: softirq
 525  */
 526 static int oz_dequeue_ep_urb(struct oz_port *port, u8 ep_addr, int in_dir,
 527                         struct urb *urb)
 528 {
 529         struct oz_urb_link *urbl = NULL;
 530         struct oz_endpoint *ep;
 531         spin_lock_bh(&port->ozhcd->hcd_lock);
 532         if (in_dir)
 533                 ep = port->in_ep[ep_addr];
 534         else
 535                 ep = port->out_ep[ep_addr];
 536         if (ep) {
 537                 struct list_head *e;
 538                 list_for_each(e, &ep->urb_list) {
 539                         urbl = container_of(e, struct oz_urb_link, link);
 540                         if (urbl->urb == urb) {
 541                                 list_del_init(e);
 542                                 break;
 543                         }
 544                         urbl = NULL;
 545                 }
 546         }
 547         spin_unlock_bh(&port->ozhcd->hcd_lock);
 548         if (urbl)
 549                 oz_free_urb_link(urbl);
 550         return urbl ? 0 : -EIDRM;
 551 }
 552 /*------------------------------------------------------------------------------
 553  * Finds an urb given its request id.
 554  * Context: softirq
 555  */
 556 static struct urb *oz_find_urb_by_id(struct oz_port *port, int ep_ix,
 557                 u8 req_id)
 558 {
 559         struct oz_hcd *ozhcd = port->ozhcd;
 560         struct urb *urb = NULL;
 561         struct oz_urb_link *urbl = NULL;
 562         struct oz_endpoint *ep;
 563
 564         spin_lock_bh(&ozhcd->hcd_lock);
 565         ep = port->out_ep[ep_ix];
 566         if (ep) {
 567                 struct list_head *e;
 568                 list_for_each(e, &ep->urb_list) {
 569                         urbl = container_of(e, struct oz_urb_link, link);
 570                         if (urbl->req_id == req_id) {
 571                                 urb = urbl->urb;
 572                                 list_del_init(e);
 573                                 break;
 574                         }
 575                 }
 576         }
 577         spin_unlock_bh(&ozhcd->hcd_lock);
 578         /* If urb is non-zero then we we must have an urb link to delete.
 579          */
 580         if (urb)
 581                 oz_free_urb_link(urbl);
 582         return urb;
 583 }
 584 /*------------------------------------------------------------------------------
 585  * Pre-condition: Port lock must be held.
 586  * Context: softirq
 587  */
 588 static void oz_acquire_port(struct oz_port *port, void *hpd)
 589 {
 590         INIT_LIST_HEAD(&port->isoc_out_ep);
 591         INIT_LIST_HEAD(&port->isoc_in_ep);
 592         port->flags |= OZ_PORT_F_PRESENT | OZ_PORT_F_CHANGED;
 593         port->status |= USB_PORT_STAT_CONNECTION |
 594                         (USB_PORT_STAT_C_CONNECTION << 16);
 595         oz_usb_get(hpd);
 596         port->hpd = hpd;
 597 }
 598 /*------------------------------------------------------------------------------
 599  * Context: softirq
 600  */
 601 static struct oz_hcd *oz_hcd_claim(void)
 602 {
 603         struct oz_hcd *ozhcd;
 604         spin_lock_bh(&g_hcdlock);
 605         ozhcd = g_ozhcd;
 606         if (ozhcd)
 607                 usb_get_hcd(ozhcd->hcd);
 608         spin_unlock_bh(&g_hcdlock);
 609         return ozhcd;
 610 }
 611 /*------------------------------------------------------------------------------
 612  * Context: softirq
 613  */
 614 static inline void oz_hcd_put(struct oz_hcd *ozhcd)
 615 {
 616         if (ozhcd)
 617                 usb_put_hcd(ozhcd->hcd);
 618 }
 619 /*------------------------------------------------------------------------------
 620  * This is called by the protocol handler to notify that a PD has arrived.
 621  * We allocate a port to associate with the PD and create a structure for
 622  * endpoint 0. This port is made the connection port.
 623  * In the event that one of the other port is already a connection port then
 624  * we fail.
 625  * TODO We should be able to do better than fail and should be able remember
 626  * that this port needs configuring and make it the connection port once the
 627  * current connection port has been assigned an address. Collisions here are
 628  * probably very rare indeed.
 629  * Context: softirq
 630  */
 631 void *oz_hcd_pd_arrived(void *hpd)
 632 {
 633         int i;
 634         void *hport = NULL;
 635         struct oz_hcd *ozhcd = NULL;
 636         struct oz_endpoint *ep;
 637         oz_trace("oz_hcd_pd_arrived()\n");
 638         ozhcd = oz_hcd_claim();
 639         if (ozhcd == NULL)
 640                 return NULL;
 641         /* Allocate an endpoint object in advance (before holding hcd lock) to
 642          * use for out endpoint 0.
 643          */
 644         ep = oz_ep_alloc(GFP_ATOMIC, 0);
 645         spin_lock_bh(&ozhcd->hcd_lock);
 646         if (ozhcd->conn_port >= 0) {
 647                 spin_unlock_bh(&ozhcd->hcd_lock);
 648                 oz_trace("conn_port >= 0\n");
 649                 goto out;
 650         }
 651         for (i = 0; i < OZ_NB_PORTS; i++) {
 652                 struct oz_port *port = &ozhcd->ports[i];
 653                 spin_lock(&port->port_lock);
 654                 if ((port->flags & OZ_PORT_F_PRESENT) == 0) {
 655                         oz_acquire_port(port, hpd);
 656                         spin_unlock(&port->port_lock);
 657                         break;
 658                 }
 659                 spin_unlock(&port->port_lock);
 660         }
 661         if (i < OZ_NB_PORTS) {
 662                 oz_trace("Setting conn_port = %d\n", i);
 663                 ozhcd->conn_port = i;
 664                 /* Attach out endpoint 0.
 665                  */
 666                 ozhcd->ports[i].out_ep[0] = ep;
 667                 ep = NULL;
 668                 hport = &ozhcd->ports[i];
 669                 spin_unlock_bh(&ozhcd->hcd_lock);
 670                 if (ozhcd->flags & OZ_HDC_F_SUSPENDED) {
 671                         oz_trace("Resuming root hub\n");
 672                         usb_hcd_resume_root_hub(ozhcd->hcd);
 673                 }
 674                 usb_hcd_poll_rh_status(ozhcd->hcd);
 675         } else {
 676                 spin_unlock_bh(&ozhcd->hcd_lock);
 677         }
 678 out:
 679         if (ep) /* ep is non-null if not used. */
 680                 oz_ep_free(NULL, ep);
 681         oz_hcd_put(ozhcd);
 682         return hport;
 683 }
 684 /*------------------------------------------------------------------------------
 685  * This is called by the protocol handler to notify that the PD has gone away.
 686  * We need to deallocate all resources and then request that the root hub is
 687  * polled. We release the reference we hold on the PD.
 688  * Context: softirq
 689  */
 690 void oz_hcd_pd_departed(void *hport)
 691 {
 692         struct oz_port *port = (struct oz_port *)hport;
 693         struct oz_hcd *ozhcd;
 694         void *hpd;
 695         struct oz_endpoint *ep = NULL;
 696
 697         oz_trace("oz_hcd_pd_departed()\n");
 698         if (port == NULL) {
 699                 oz_trace("oz_hcd_pd_departed() port = 0\n");
 700                 return;
 701         }
 702         ozhcd = port->ozhcd;
 703         if (ozhcd == NULL)
 704                 return;
 705         /* Check if this is the connection port - if so clear it.
 706          */
 707         spin_lock_bh(&ozhcd->hcd_lock);
 708         if ((ozhcd->conn_port >= 0) &&
 709                 (port == &ozhcd->ports[ozhcd->conn_port])) {
 710                 oz_trace("Clearing conn_port\n");
 711                 ozhcd->conn_port = -1;
 712         }
 713         spin_lock(&port->port_lock);
 714         port->flags |= OZ_PORT_F_DYING;
 715         spin_unlock(&port->port_lock);
 716         spin_unlock_bh(&ozhcd->hcd_lock);
 717
 718         oz_clean_endpoints_for_config(ozhcd->hcd, port);
 719         spin_lock_bh(&port->port_lock);
 720         hpd = port->hpd;
 721         port->hpd = NULL;
 722         port->bus_addr = 0xff;
 723         port->flags &= ~(OZ_PORT_F_PRESENT | OZ_PORT_F_DYING);
 724         port->flags |= OZ_PORT_F_CHANGED;
 725         port->status &= ~USB_PORT_STAT_CONNECTION;
 726         port->status |= (USB_PORT_STAT_C_CONNECTION << 16);
 727         /* If there is an endpont 0 then clear the pointer while we hold
 728          * the spinlock be we deallocate it after releasing the lock.
 729          */
 730         if (port->out_ep[0]) {
 731                 ep = port->out_ep[0];
 732                 port->out_ep[0] = NULL;
 733         }
 734         spin_unlock_bh(&port->port_lock);
 735         if (ep)
 736                 oz_ep_free(port, ep);
 737         usb_hcd_poll_rh_status(ozhcd->hcd);
 738         oz_usb_put(hpd);
 739 }
 740 /*------------------------------------------------------------------------------
 741  * Context: softirq
 742  */
 743 void oz_hcd_pd_reset(void *hpd, void *hport)
 744 {
 745         /* Cleanup the current configuration and report reset to the core.
 746          */
 747         struct oz_port *port = (struct oz_port *)hport;
 748         struct oz_hcd *ozhcd = port->ozhcd;
 749         oz_trace("PD Reset\n");
 750         spin_lock_bh(&port->port_lock);
 751         port->flags |= OZ_PORT_F_CHANGED;
 752         port->status |= USB_PORT_STAT_RESET;
 753         port->status |= (USB_PORT_STAT_C_RESET << 16);
 754         spin_unlock_bh(&port->port_lock);
 755         oz_clean_endpoints_for_config(ozhcd->hcd, port);
 756         usb_hcd_poll_rh_status(ozhcd->hcd);
 757 }
 758 /*------------------------------------------------------------------------------
 759  * Context: softirq
 760  */
 761 void oz_hcd_get_desc_cnf(void *hport, u8 req_id, int status, u8 *desc,
 762                         int length, int offset, int total_size)
 763 {
 764         struct oz_port *port = (struct oz_port *)hport;
 765         struct urb *urb;
 766         int err = 0;
 767
 768         oz_event_log(OZ_EVT_CTRL_CNF, 0, req_id, NULL, status);
 769         oz_trace("oz_hcd_get_desc_cnf length = %d offs = %d tot_size = %d\n",
 770                         length, offset, total_size);
 771         urb = oz_find_urb_by_id(port, 0, req_id);
 772         if (!urb)
 773                 return;
 774         if (status == 0) {
 775                 int copy_len;
 776                 int required_size = urb->transfer_buffer_length;
 777                 if (required_size > total_size)
 778                         required_size = total_size;
 779                 copy_len = required_size-offset;
 780                 if (length <= copy_len)
 781                         copy_len = length;
 782                 memcpy(urb->transfer_buffer+offset, desc, copy_len);
 783                 offset += copy_len;
 784                 if (offset < required_size) {
 785                         struct usb_ctrlrequest *setup =
 786                                 (struct usb_ctrlrequest *)urb->setup_packet;
 787                         unsigned wvalue = le16_to_cpu(setup->wValue);
 788                         if (oz_enqueue_ep_urb(port, 0, 0, urb, req_id))
 789                                 err = -ENOMEM;
 790                         else if (oz_usb_get_desc_req(port->hpd, req_id,
 791                                         setup->bRequestType, (u8)(wvalue>>8),
 792                                         (u8)wvalue, setup->wIndex, offset,
 793                                         required_size-offset)) {
 794                                 oz_dequeue_ep_urb(port, 0, 0, urb);
 795                                 err = -ENOMEM;
 796                         }
 797                         if (err == 0)
 798                                 return;
 799                 }
 800         }
 801         urb->actual_length = total_size;
 802         oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
 803 }
 804 /*------------------------------------------------------------------------------
 805  * Context: softirq
 806  */
 807 #ifdef WANT_TRACE
 808 static void oz_display_conf_type(u8 t)
 809 {
 810         switch (t) {
 811         case USB_REQ_GET_STATUS:
 812                 oz_trace("USB_REQ_GET_STATUS - cnf\n");
 813                 break;
 814         case USB_REQ_CLEAR_FEATURE:
 815                 oz_trace("USB_REQ_CLEAR_FEATURE - cnf\n");
 816                 break;
 817         case USB_REQ_SET_FEATURE:
 818                 oz_trace("USB_REQ_SET_FEATURE - cnf\n");
 819                 break;
 820         case USB_REQ_SET_ADDRESS:
 821                 oz_trace("USB_REQ_SET_ADDRESS - cnf\n");
 822                 break;
 823         case USB_REQ_GET_DESCRIPTOR:
 824                 oz_trace("USB_REQ_GET_DESCRIPTOR - cnf\n");
 825                 break;
 826         case USB_REQ_SET_DESCRIPTOR:
 827                 oz_trace("USB_REQ_SET_DESCRIPTOR - cnf\n");
 828                 break;
 829         case USB_REQ_GET_CONFIGURATION:
 830                 oz_trace("USB_REQ_GET_CONFIGURATION - cnf\n");
 831                 break;
 832         case USB_REQ_SET_CONFIGURATION:
 833                 oz_trace("USB_REQ_SET_CONFIGURATION - cnf\n");
 834                 break;
 835         case USB_REQ_GET_INTERFACE:
 836                 oz_trace("USB_REQ_GET_INTERFACE - cnf\n");
 837                 break;
 838         case USB_REQ_SET_INTERFACE:
 839                 oz_trace("USB_REQ_SET_INTERFACE - cnf\n");
 840                 break;
 841         case USB_REQ_SYNCH_FRAME:
 842                 oz_trace("USB_REQ_SYNCH_FRAME - cnf\n");
 843                 break;
 844         }
 845 }
 846 #else
 847 #define oz_display_conf_type(__x)
 848 #endif /* WANT_TRACE */
 849 /*------------------------------------------------------------------------------
 850  * Context: softirq
 851  */
 852 static void oz_hcd_complete_set_config(struct oz_port *port, struct urb *urb,
 853                 u8 rcode, u8 config_num)
 854 {
 855         int rc = 0;
 856         struct usb_hcd *hcd = port->ozhcd->hcd;
 857         if (rcode == 0) {
 858                 port->config_num = config_num;
 859                 oz_clean_endpoints_for_config(hcd, port);
 860                 if (oz_build_endpoints_for_config(hcd, port,
 861                         &urb->dev->config[port->config_num-1], GFP_ATOMIC)) {
 862                         rc = -ENOMEM;
 863                 }
 864         } else {
 865                 rc = -ENOMEM;
 866         }
 867         oz_complete_urb(hcd, urb, rc, 0);
 868 }
 869 /*------------------------------------------------------------------------------
 870  * Context: softirq
 871  */
 872 static void oz_hcd_complete_set_interface(struct oz_port *port, struct urb *urb,
 873                 u8 rcode, u8 if_num, u8 alt)
 874 {
 875         struct usb_hcd *hcd = port->ozhcd->hcd;
 876         int rc = 0;
 877         if (rcode == 0) {
 878                 struct usb_host_config *config;
 879                 struct usb_host_interface *intf;
 880                 oz_trace("Set interface %d alt %d\n", if_num, alt);
 881                 oz_clean_endpoints_for_interface(hcd, port, if_num);
 882                 config = &urb->dev->config[port->config_num-1];
 883                 intf = &config->intf_cache[if_num]->altsetting[alt];
 884                 if (oz_build_endpoints_for_interface(hcd, port, intf,
 885                         GFP_ATOMIC))
 886                         rc = -ENOMEM;
 887                 else
 888                         port->iface[if_num].alt = alt;
 889         } else {
 890                 rc = -ENOMEM;
 891         }
 892         oz_complete_urb(hcd, urb, rc, 0);
 893 }
 894 /*------------------------------------------------------------------------------
 895  * Context: softirq
 896  */
 897 void oz_hcd_control_cnf(void *hport, u8 req_id, u8 rcode, u8 *data,
 898         int data_len)
 899 {
 900         struct oz_port *port = (struct oz_port *)hport;
 901         struct urb *urb;
 902         struct usb_ctrlrequest *setup;
 903         struct usb_hcd *hcd = port->ozhcd->hcd;
 904         unsigned windex;
 905         unsigned wvalue;
 906
 907         oz_event_log(OZ_EVT_CTRL_CNF, 0, req_id, NULL, rcode);
 908         oz_trace("oz_hcd_control_cnf rcode=%u len=%d\n", rcode, data_len);
 909         urb = oz_find_urb_by_id(port, 0, req_id);
 910         if (!urb) {
 911                 oz_trace("URB not found\n");
 912                 return;
 913         }
 914         setup = (struct usb_ctrlrequest *)urb->setup_packet;
 915         windex = le16_to_cpu(setup->wIndex);
 916         wvalue = le16_to_cpu(setup->wValue);
 917         if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 918                 /* Standard requests */
 919                 oz_display_conf_type(setup->bRequest);
 920                 switch (setup->bRequest) {
 921                 case USB_REQ_SET_CONFIGURATION:
 922                         oz_hcd_complete_set_config(port, urb, rcode,
 923                                 (u8)wvalue);
 924                         break;
 925                 case USB_REQ_SET_INTERFACE:
 926                         oz_hcd_complete_set_interface(port, urb, rcode,
 927                                 (u8)windex, (u8)wvalue);
 928                         break;
 929                 default:
 930                         oz_complete_urb(hcd, urb, 0, 0);
 931                 }
 932
 933         } else {
 934                 int copy_len;
 935                 oz_trace("VENDOR-CLASS - cnf\n");
 936                 if (data_len) {
 937                         if (data_len <= urb->transfer_buffer_length)
 938                                 copy_len = data_len;
 939                         else
 940                                 copy_len = urb->transfer_buffer_length;
 941                         memcpy(urb->transfer_buffer, data, copy_len);
 942                         urb->actual_length = copy_len;
 943                 }
 944                 oz_complete_urb(hcd, urb, 0, 0);
 945         }
 946 }
 947 /*------------------------------------------------------------------------------
 948  * Context: softirq-serialized
 949  */
 950 static int oz_hcd_buffer_data(struct oz_endpoint *ep, u8 *data, int data_len)
 951 {
 952         int space;
 953         int copy_len;
 954         if (!ep->buffer)
 955                 return -1;
 956         space = ep->out_ix-ep->in_ix-1;
 957         if (space < 0)
 958                 space += ep->buffer_size;
 959         if (space < (data_len+1)) {
 960                 oz_trace("Buffer full\n");
 961                 return -1;
 962         }
 963         ep->buffer[ep->in_ix] = (u8)data_len;
 964         if (++ep->in_ix == ep->buffer_size)
 965                 ep->in_ix = 0;
 966         copy_len = ep->buffer_size - ep->in_ix;
 967         if (copy_len > data_len)
 968                 copy_len = data_len;
 969         memcpy(&ep->buffer[ep->in_ix], data, copy_len);
 970
 971         if (copy_len < data_len) {
 972                 memcpy(ep->buffer, data+copy_len, data_len-copy_len);
 973                 ep->in_ix = data_len-copy_len;
 974         } else {
 975                 ep->in_ix += copy_len;
 976         }
 977         if (ep->in_ix == ep->buffer_size)
 978                 ep->in_ix = 0;
 979         ep->buffered_units++;
 980         return 0;
 981 }
 982 /*------------------------------------------------------------------------------
 983  * Context: softirq-serialized
 984  */
 985 void oz_hcd_data_ind(void *hport, u8 endpoint, u8 *data, int data_len)
 986 {
 987         struct oz_port *port = (struct oz_port *)hport;
 988         struct oz_endpoint *ep;
 989         struct oz_hcd *ozhcd = port->ozhcd;
 990         spin_lock_bh(&ozhcd->hcd_lock);
 991         ep = port->in_ep[endpoint & USB_ENDPOINT_NUMBER_MASK];
 992         if (ep == NULL)
 993                 goto done;
 994         switch (ep->attrib & USB_ENDPOINT_XFERTYPE_MASK) {
 995         case USB_ENDPOINT_XFER_INT:
 996         case USB_ENDPOINT_XFER_BULK:
 997                 if (!list_empty(&ep->urb_list)) {
 998                         struct oz_urb_link *urbl =
 999                                 list_first_entry(&ep->urb_list,
1000                                         struct oz_urb_link, link);
1001                         struct urb *urb;
1002                         int copy_len;
1003                         list_del_init(&urbl->link);
1004                         spin_unlock_bh(&ozhcd->hcd_lock);
1005                         urb = urbl->urb;
1006                         oz_free_urb_link(urbl);
1007                         if (data_len <= urb->transfer_buffer_length)
1008                                 copy_len = data_len;
1009                         else
1010                                 copy_len = urb->transfer_buffer_length;
1011                         memcpy(urb->transfer_buffer, data, copy_len);
1012                         urb->actual_length = copy_len;
1013                         oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
1014                         return;
1015                 } else {
1016                         oz_trace("buffering frame as URB is not available\n");
1017                         oz_hcd_buffer_data(ep, data, data_len);
1018                 }
1019                 break;
1020         case USB_ENDPOINT_XFER_ISOC:
1021                 oz_hcd_buffer_data(ep, data, data_len);
1022                 break;
1023         }
1024 done:
1025         spin_unlock_bh(&ozhcd->hcd_lock);
1026 }
1027 /*------------------------------------------------------------------------------
1028  * Context: unknown
1029  */
1030 static inline int oz_usb_get_frame_number(void)
1031 {
1032         return jiffies_to_msecs(get_jiffies_64());
1033 }
1034 /*------------------------------------------------------------------------------
1035  * Context: softirq
1036  */
1037 int oz_hcd_heartbeat(void *hport)
1038 {
1039         int rc = 0;
1040         struct oz_port *port = (struct oz_port *)hport;
1041         struct oz_hcd *ozhcd = port->ozhcd;
1042         struct oz_urb_link *urbl;
1043         struct list_head xfr_list;
1044         struct list_head *e;
1045         struct list_head *n;
1046         struct urb *urb;
1047         struct oz_endpoint *ep;
1048         unsigned long now = jiffies;
1049         INIT_LIST_HEAD(&xfr_list);
1050         /* Check the OUT isoc endpoints to see if any URB data can be sent.
1051          */
1052         spin_lock_bh(&ozhcd->hcd_lock);
1053         list_for_each(e, &port->isoc_out_ep) {
1054                 ep = ep_from_link(e);
1055                 if (ep->credit < 0)
1056                         continue;
1057                 ep->credit += jiffies_to_msecs(now - ep->last_jiffies);
1058                 if (ep->credit > ep->credit_ceiling)
1059                         ep->credit = ep->credit_ceiling;
1060                 oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num, 0, NULL,
1061                              ep->credit);
1062                 ep->last_jiffies = now;
1063                 while (ep->credit && !list_empty(&ep->urb_list)) {
1064                         urbl = list_first_entry(&ep->urb_list,
1065                                 struct oz_urb_link, link);
1066                         urb = urbl->urb;
1067                         if ((ep->credit + 1) < urb->number_of_packets)
1068                                 break;
1069                         ep->credit -= urb->number_of_packets;
1070                         oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num, 0, NULL,
1071                                      ep->credit);
1072                         list_move_tail(&urbl->link, &xfr_list);
1073                 }
1074         }
1075         spin_unlock_bh(&ozhcd->hcd_lock);
1076         /* Send to PD and complete URBs.
1077          */
1078         list_for_each_safe(e, n, &xfr_list) {
1079                 unsigned long t;
1080                 urbl = container_of(e, struct oz_urb_link, link);
1081                 urb = urbl->urb;
1082                 t = urbl->submit_jiffies;
1083                 list_del_init(e);
1084                 urb->error_count = 0;
1085                 urb->start_frame = oz_usb_get_frame_number();
1086                 oz_usb_send_isoc(port->hpd, urbl->ep_num, urb);
1087                 oz_free_urb_link(urbl);
1088                 oz_complete_urb(port->ozhcd->hcd, urb, 0, t);
1089         }
1090         /* Check the IN isoc endpoints to see if any URBs can be completed.
1091          */
1092         spin_lock_bh(&ozhcd->hcd_lock);
1093         list_for_each(e, &port->isoc_in_ep) {
1094                 struct oz_endpoint *ep = ep_from_link(e);
1095                 if (ep->flags & OZ_F_EP_BUFFERING) {
1096                         if (ep->buffered_units >= OZ_IN_BUFFERING_UNITS) {
1097                                 ep->flags &= ~OZ_F_EP_BUFFERING;
1098                                 ep->credit = 0;
1099                                 oz_event_log(OZ_EVT_EP_CREDIT,
1100                                         ep->ep_num | USB_DIR_IN,
1101                                         0, NULL, ep->credit);
1102                                 ep->last_jiffies = now;
1103                                 ep->start_frame = 0;
1104                                 oz_event_log(OZ_EVT_EP_BUFFERING,
1105                                         ep->ep_num | USB_DIR_IN, 0, NULL, 0);
1106                         }
1107                         continue;
1108                 }
1109                 ep->credit += jiffies_to_msecs(now - ep->last_jiffies);
1110                 oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num | USB_DIR_IN,
1111                         0, NULL, ep->credit);
1112                 ep->last_jiffies = now;
1113                 while (!list_empty(&ep->urb_list)) {
1114                         struct oz_urb_link *urbl =
1115                                 list_first_entry(&ep->urb_list,
1116                                         struct oz_urb_link, link);
1117                         struct urb *urb = urbl->urb;
1118                         int len = 0;
1119                         int copy_len;
1120                         int i;
1121                         if ((ep->credit + 1) < urb->number_of_packets)
1122                                 break;
1123                         if (ep->buffered_units < urb->number_of_packets)
1124                                 break;
1125                         urb->actual_length = 0;
1126                         for (i = 0; i < urb->number_of_packets; i++) {
1127                                 len = ep->buffer[ep->out_ix];
1128                                 if (++ep->out_ix == ep->buffer_size)
1129                                         ep->out_ix = 0;
1130                                 copy_len = ep->buffer_size - ep->out_ix;
1131                                 if (copy_len > len)
1132                                         copy_len = len;
1133                                 memcpy(urb->transfer_buffer,
1134                                         &ep->buffer[ep->out_ix], copy_len);
1135                                 if (copy_len < len) {
1136                                         memcpy(urb->transfer_buffer+copy_len,
1137                                                 ep->buffer, len-copy_len);
1138                                         ep->out_ix = len-copy_len;
1139                                 } else
1140                                         ep->out_ix += copy_len;
1141                                 if (ep->out_ix == ep->buffer_size)
1142                                         ep->out_ix = 0;
1143                                 urb->iso_frame_desc[i].offset =
1144                                         urb->actual_length;
1145                                 urb->actual_length += len;
1146                                 urb->iso_frame_desc[i].actual_length = len;
1147                                 urb->iso_frame_desc[i].status = 0;
1148                         }
1149                         ep->buffered_units -= urb->number_of_packets;
1150                         urb->error_count = 0;
1151                         urb->start_frame = ep->start_frame;
1152                         ep->start_frame += urb->number_of_packets;
1153                         list_move_tail(&urbl->link, &xfr_list);
1154                         ep->credit -= urb->number_of_packets;
1155                         oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num | USB_DIR_IN,
1156                                 0, NULL, ep->credit);
1157                 }
1158         }
1159         if (!list_empty(&port->isoc_out_ep) || !list_empty(&port->isoc_in_ep))
1160                 rc = 1;
1161         spin_unlock_bh(&ozhcd->hcd_lock);
1162         /* Complete the filled URBs.
1163          */
1164         list_for_each_safe(e, n, &xfr_list) {
1165                 urbl = container_of(e, struct oz_urb_link, link);
1166                 urb = urbl->urb;
1167                 list_del_init(e);
1168                 oz_free_urb_link(urbl);
1169                 oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
1170         }
1171         /* Check if there are any ep0 requests that have timed out.
1172          * If so resent to PD.
1173          */
1174         ep = port->out_ep[0];
1175         if (ep) {
1176                 struct list_head *e;
1177                 struct list_head *n;
1178                 spin_lock_bh(&ozhcd->hcd_lock);
1179                 list_for_each_safe(e, n, &ep->urb_list) {
1180                         urbl = container_of(e, struct oz_urb_link, link);
1181                         if (time_after(now, urbl->submit_jiffies+HZ/2)) {
1182                                 oz_trace("%ld: Request 0x%p timeout\n",
1183                                                 now, urbl->urb);
1184                                 urbl->submit_jiffies = now;
1185                                 list_move_tail(e, &xfr_list);
1186                         }
1187                 }
1188                 if (!list_empty(&ep->urb_list))
1189                         rc = 1;
1190                 spin_unlock_bh(&ozhcd->hcd_lock);
1191                 e = xfr_list.next;
1192                 while (e != &xfr_list) {
1193                         urbl = container_of(e, struct oz_urb_link, link);
1194                         e = e->next;
1195                         oz_trace("Resending request to PD.\n");
1196                         oz_process_ep0_urb(ozhcd, urbl->urb, GFP_ATOMIC);
1197                         oz_free_urb_link(urbl);
1198                 }
1199         }
1200         return rc;
1201 }
1202 /*------------------------------------------------------------------------------
1203  * Context: softirq
1204  */
1205 static int oz_build_endpoints_for_interface(struct usb_hcd *hcd,
1206                 struct oz_port *port,
1207                 struct usb_host_interface *intf, gfp_t mem_flags)
1208 {
1209         struct oz_hcd *ozhcd = port->ozhcd;
1210         int i;
1211         int if_ix = intf->desc.bInterfaceNumber;
1212         int request_heartbeat = 0;
1213         oz_trace("interface[%d] = %p\n", if_ix, intf);
1214         for (i = 0; i < intf->desc.bNumEndpoints; i++) {
1215                 struct usb_host_endpoint *hep = &intf->endpoint[i];
1216                 u8 ep_addr = hep->desc.bEndpointAddress;
1217                 u8 ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
1218                 struct oz_endpoint *ep;
1219                 int buffer_size = 0;
1220
1221                 oz_trace("%d bEndpointAddress = %x\n", i, ep_addr);
1222                 if (ep_addr & USB_ENDPOINT_DIR_MASK) {
1223                         switch (hep->desc.bmAttributes &
1224                                                 USB_ENDPOINT_XFERTYPE_MASK) {
1225                         case USB_ENDPOINT_XFER_ISOC:
1226                                 buffer_size = 24*1024;
1227                                 break;
1228                         case USB_ENDPOINT_XFER_INT:
1229                                 buffer_size = 128;
1230                                 break;
1231                         }
1232                 }
1233
1234                 ep = oz_ep_alloc(mem_flags, buffer_size);
1235                 if (!ep) {
1236                         oz_clean_endpoints_for_interface(hcd, port, if_ix);
1237                         return -ENOMEM;
1238                 }
1239                 ep->attrib = hep->desc.bmAttributes;
1240                 ep->ep_num = ep_num;
1241                 if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
1242                         == USB_ENDPOINT_XFER_ISOC) {
1243                         oz_trace("wMaxPacketSize = %d\n",
1244                                 hep->desc.wMaxPacketSize);
1245                         ep->credit_ceiling = 200;
1246                         if (ep_addr & USB_ENDPOINT_DIR_MASK) {
1247                                 ep->flags |= OZ_F_EP_BUFFERING;
1248                                 oz_event_log(OZ_EVT_EP_BUFFERING,
1249                                         ep->ep_num | USB_DIR_IN, 1, NULL, 0);
1250                         } else {
1251                                 ep->flags |= OZ_F_EP_HAVE_STREAM;
1252                                 if (oz_usb_stream_create(port->hpd, ep_num))
1253                                         ep->flags &= ~OZ_F_EP_HAVE_STREAM;
1254                         }
1255                 }
1256                 spin_lock_bh(&ozhcd->hcd_lock);
1257                 if (ep_addr & USB_ENDPOINT_DIR_MASK) {
1258                         port->in_ep[ep_num] = ep;
1259                         port->iface[if_ix].ep_mask |=
1260                                 (1<<(ep_num+OZ_NB_ENDPOINTS));
1261                         if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
1262                                  == USB_ENDPOINT_XFER_ISOC) {
1263                                 list_add_tail(&ep->link, &port->isoc_in_ep);
1264                                 request_heartbeat = 1;
1265                         }
1266                 } else {
1267                         port->out_ep[ep_num] = ep;
1268                         port->iface[if_ix].ep_mask |= (1<<ep_num);
1269                         if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
1270                                 == USB_ENDPOINT_XFER_ISOC) {
1271                                 list_add_tail(&ep->link, &port->isoc_out_ep);
1272                                 request_heartbeat = 1;
1273                         }
1274                 }
1275                 spin_unlock_bh(&ozhcd->hcd_lock);
1276                 if (request_heartbeat && port->hpd)
1277                         oz_usb_request_heartbeat(port->hpd);
1278         }
1279         return 0;
1280 }
1281 /*------------------------------------------------------------------------------
1282  * Context: softirq
1283  */
1284 static void oz_clean_endpoints_for_interface(struct usb_hcd *hcd,
1285                         struct oz_port *port, int if_ix)
1286 {
1287         struct oz_hcd *ozhcd = port->ozhcd;
1288         unsigned mask;
1289         int i;
1290         struct list_head ep_list;
1291
1292         oz_trace("Deleting endpoints for interface %d\n", if_ix);
1293         if (if_ix >= port->num_iface)
1294                 return;
1295         INIT_LIST_HEAD(&ep_list);
1296         spin_lock_bh(&ozhcd->hcd_lock);
1297         mask = port->iface[if_ix].ep_mask;
1298         port->iface[if_ix].ep_mask = 0;
1299         for (i = 0; i < OZ_NB_ENDPOINTS; i++) {
1300                 struct list_head *e;
1301                 /* Gather OUT endpoints.
1302                  */
1303                 if ((mask & (1<<i)) && port->out_ep[i]) {
1304                         e = &port->out_ep[i]->link;
1305                         port->out_ep[i] = NULL;
1306                         /* Remove from isoc list if present.
1307                          */
1308                         list_move_tail(e, &ep_list);
1309                 }
1310                 /* Gather IN endpoints.
1311                  */
1312                 if ((mask & (1<<(i+OZ_NB_ENDPOINTS))) && port->in_ep[i]) {
1313                         e = &port->in_ep[i]->link;
1314                         port->in_ep[i] = NULL;
1315                         list_move_tail(e, &ep_list);
1316                 }
1317         }
1318         spin_unlock_bh(&ozhcd->hcd_lock);
1319         while (!list_empty(&ep_list)) {
1320                 struct oz_endpoint *ep =
1321                         list_first_entry(&ep_list, struct oz_endpoint, link);
1322                 list_del_init(&ep->link);
1323                 oz_ep_free(port, ep);
1324         }
1325 }
1326 /*------------------------------------------------------------------------------
1327  * Context: softirq
1328  */
1329 static int oz_build_endpoints_for_config(struct usb_hcd *hcd,
1330                 struct oz_port *port, struct usb_host_config *config,
1331                 gfp_t mem_flags)
1332 {
1333         struct oz_hcd *ozhcd = port->ozhcd;
1334         int i;
1335         int num_iface = config->desc.bNumInterfaces;
1336         if (num_iface) {
1337                 struct oz_interface *iface;
1338
1339                 iface = kmalloc(num_iface*sizeof(struct oz_interface),
1340                                 mem_flags | __GFP_ZERO);
1341                 if (!iface)
1342                         return -ENOMEM;
1343                 spin_lock_bh(&ozhcd->hcd_lock);
1344                 port->iface = iface;
1345                 port->num_iface = num_iface;
1346                 spin_unlock_bh(&ozhcd->hcd_lock);
1347         }
1348         for (i = 0; i < num_iface; i++) {
1349                 struct usb_host_interface *intf =
1350                         &config->intf_cache[i]->altsetting[0];
1351                 if (oz_build_endpoints_for_interface(hcd, port, intf,
1352                         mem_flags))
1353                         goto fail;
1354         }
1355         return 0;
1356 fail:
1357         oz_clean_endpoints_for_config(hcd, port);
1358         return -1;
1359 }
1360 /*------------------------------------------------------------------------------
1361  * Context: softirq
1362  */
1363 static void oz_clean_endpoints_for_config(struct usb_hcd *hcd,
1364                         struct oz_port *port)
1365 {
1366         struct oz_hcd *ozhcd = port->ozhcd;
1367         int i;
1368         oz_trace("Deleting endpoints for configuration.\n");
1369         for (i = 0; i < port->num_iface; i++)
1370                 oz_clean_endpoints_for_interface(hcd, port, i);
1371         spin_lock_bh(&ozhcd->hcd_lock);
1372         if (port->iface) {
1373                 oz_trace("Freeing interfaces object.\n");
1374                 kfree(port->iface);
1375                 port->iface = NULL;
1376         }
1377         port->num_iface = 0;
1378         spin_unlock_bh(&ozhcd->hcd_lock);
1379 }
1380 /*------------------------------------------------------------------------------
1381  * Context: tasklet
1382  */
1383 static void *oz_claim_hpd(struct oz_port *port)
1384 {
1385         void *hpd = NULL;
1386         struct oz_hcd *ozhcd = port->ozhcd;
1387         spin_lock_bh(&ozhcd->hcd_lock);
1388         hpd = port->hpd;
1389         if (hpd)
1390                 oz_usb_get(hpd);
1391         spin_unlock_bh(&ozhcd->hcd_lock);
1392         return hpd;
1393 }
1394 /*------------------------------------------------------------------------------
1395  * Context: tasklet
1396  */
1397 static void oz_process_ep0_urb(struct oz_hcd *ozhcd, struct urb *urb,
1398                 gfp_t mem_flags)
1399 {
1400         struct usb_ctrlrequest *setup;
1401         unsigned windex;
1402         unsigned wvalue;
1403         unsigned wlength;
1404         void *hpd = NULL;
1405         u8 req_id;
1406         int rc = 0;
1407         unsigned complete = 0;
1408
1409         int port_ix = -1;
1410         struct oz_port *port = NULL;
1411
1412         oz_trace2(OZ_TRACE_URB, "%lu: oz_process_ep0_urb(%p)\n", jiffies, urb);
1413         port_ix = oz_get_port_from_addr(ozhcd, urb->dev->devnum);
1414         if (port_ix < 0) {
1415                 rc = -EPIPE;
1416                 goto out;
1417         }
1418         port =  &ozhcd->ports[port_ix];
1419         if (((port->flags & OZ_PORT_F_PRESENT) == 0)
1420                 || (port->flags & OZ_PORT_F_DYING)) {
1421                 oz_trace("Refusing URB port_ix = %d devnum = %d\n",
1422                         port_ix, urb->dev->devnum);
1423                 rc = -EPIPE;
1424                 goto out;
1425         }
1426         /* Store port in private context data.
1427          */
1428         urb->hcpriv = port;
1429         setup = (struct usb_ctrlrequest *)urb->setup_packet;
1430         windex = le16_to_cpu(setup->wIndex);
1431         wvalue = le16_to_cpu(setup->wValue);
1432         wlength = le16_to_cpu(setup->wLength);
1433         oz_trace2(OZ_TRACE_CTRL_DETAIL, "bRequestType = %x\n",
1434                 setup->bRequestType);
1435         oz_trace2(OZ_TRACE_CTRL_DETAIL, "bRequest = %x\n", setup->bRequest);
1436         oz_trace2(OZ_TRACE_CTRL_DETAIL, "wValue = %x\n", wvalue);
1437         oz_trace2(OZ_TRACE_CTRL_DETAIL, "wIndex = %x\n", windex);
1438         oz_trace2(OZ_TRACE_CTRL_DETAIL, "wLength = %x\n", wlength);
1439
1440         req_id = port->next_req_id++;
1441         hpd = oz_claim_hpd(port);
1442         if (hpd == NULL) {
1443                 oz_trace("Cannot claim port\n");
1444                 rc = -EPIPE;
1445                 goto out;
1446         }
1447
1448         if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1449                 /* Standard requests
1450                  */
1451                 switch (setup->bRequest) {
1452                 case USB_REQ_GET_DESCRIPTOR:
1453                         oz_trace("USB_REQ_GET_DESCRIPTOR - req\n");
1454                         break;
1455                 case USB_REQ_SET_ADDRESS:
1456                         oz_event_log(OZ_EVT_CTRL_LOCAL, setup->bRequest,
1457                                 0, NULL, setup->bRequestType);
1458                         oz_trace("USB_REQ_SET_ADDRESS - req\n");
1459                         oz_trace("Port %d address is 0x%x\n", ozhcd->conn_port,
1460                                 (u8)le16_to_cpu(setup->wValue));
1461                         spin_lock_bh(&ozhcd->hcd_lock);
1462                         if (ozhcd->conn_port >= 0) {
1463                                 ozhcd->ports[ozhcd->conn_port].bus_addr =
1464                                         (u8)le16_to_cpu(setup->wValue);
1465                                 oz_trace("Clearing conn_port\n");
1466                                 ozhcd->conn_port = -1;
1467                         }
1468                         spin_unlock_bh(&ozhcd->hcd_lock);
1469                         complete = 1;
1470                         break;
1471                 case USB_REQ_SET_CONFIGURATION:
1472                         oz_trace("USB_REQ_SET_CONFIGURATION - req\n");
1473                         break;
1474                 case USB_REQ_GET_CONFIGURATION:
1475                         /* We short circuit this case and reply directly since
1476                          * we have the selected configuration number cached.
1477                          */
1478                         oz_event_log(OZ_EVT_CTRL_LOCAL, setup->bRequest, 0,
1479                                      NULL, setup->bRequestType);
1480                         oz_trace("USB_REQ_GET_CONFIGURATION - reply now\n");
1481                         if (urb->transfer_buffer_length >= 1) {
1482                                 urb->actual_length = 1;
1483                                 *((u8 *)urb->transfer_buffer) =
1484                                         port->config_num;
1485                                 complete = 1;
1486                         } else {
1487                                 rc = -EPIPE;
1488                         }
1489                         break;
1490                 case USB_REQ_GET_INTERFACE:
1491                         /* We short circuit this case and reply directly since
1492                          * we have the selected interface alternative cached.
1493                          */
1494                         oz_event_log(OZ_EVT_CTRL_LOCAL, setup->bRequest, 0,
1495                                      NULL, setup->bRequestType);
1496                         oz_trace("USB_REQ_GET_INTERFACE - reply now\n");
1497                         if (urb->transfer_buffer_length >= 1) {
1498                                 urb->actual_length = 1;
1499                                 *((u8 *)urb->transfer_buffer) =
1500                                         port->iface[(u8)windex].alt;
1501                                 oz_trace("interface = %d alt = %d\n",
1502                                         windex, port->iface[(u8)windex].alt);
1503                                 complete = 1;
1504                         } else {
1505                                 rc = -EPIPE;
1506                         }
1507                         break;
1508                 case USB_REQ_SET_INTERFACE:
1509                         oz_trace("USB_REQ_SET_INTERFACE - req\n");
1510                         break;
1511                 }
1512         }
1513         if (!rc && !complete) {
1514                 int data_len = 0;
1515                 if ((setup->bRequestType & USB_DIR_IN) == 0)
1516                         data_len = wlength;
1517                 urb->actual_length = data_len;
1518                 if (oz_usb_control_req(port->hpd, req_id, setup,
1519                                 urb->transfer_buffer, data_len)) {
1520                         rc = -ENOMEM;
1521                 } else {
1522                         /* Note: we are queuing the request after we have
1523                          * submitted it to be transmitted. If the request were
1524                          * to complete before we queued it then it would not
1525                          * be found in the queue. It seems impossible for
1526                          * this to happen but if it did the request would
1527                          * be resubmitted so the problem would hopefully
1528                          * resolve itself. Putting the request into the
1529                          * queue before it has been sent is worse since the
1530                          * urb could be cancelled while we are using it
1531                          * to build the request.
1532                          */
1533                         if (oz_enqueue_ep_urb(port, 0, 0, urb, req_id))
1534                                 rc = -ENOMEM;
1535                 }
1536         }
1537         oz_usb_put(hpd);
1538 out:
1539         if (rc || complete) {
1540                 oz_trace("Completing request locally\n");
1541                 oz_complete_urb(ozhcd->hcd, urb, rc, 0);
1542         } else {
1543                 oz_usb_request_heartbeat(port->hpd);
1544         }
1545 }
1546 /*------------------------------------------------------------------------------
1547  * Context: tasklet
1548  */
1549 static int oz_urb_process(struct oz_hcd *ozhcd, struct urb *urb)
1550 {
1551         int rc = 0;
1552         struct oz_port *port = urb->hcpriv;
1553         u8 ep_addr;
1554         /* When we are paranoid we keep a list of urbs which we check against
1555          * before handing one back. This is just for debugging during
1556          * development and should be turned off in the released driver.
1557          */
1558         oz_remember_urb(urb);
1559         /* Check buffer is valid.
1560          */
1561         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1562                 return -EINVAL;
1563         /* Check if there is a device at the port - refuse if not.
1564          */
1565         if ((port->flags & OZ_PORT_F_PRESENT) == 0)
1566                 return -EPIPE;
1567         ep_addr = usb_pipeendpoint(urb->pipe);
1568         if (ep_addr) {
1569                 /* If the request is not for EP0 then queue it.
1570                  */
1571                 if (oz_enqueue_ep_urb(port, ep_addr, usb_pipein(urb->pipe),
1572                         urb, 0))
1573                         rc = -EPIPE;
1574         } else {
1575                 oz_process_ep0_urb(ozhcd, urb, GFP_ATOMIC);
1576         }
1577         return rc;
1578 }
1579 /*------------------------------------------------------------------------------
1580  * Context: tasklet
1581  */
1582 static void oz_urb_process_tasklet(unsigned long unused)
1583 {
1584         unsigned long irq_state;
1585         struct urb *urb;
1586         struct oz_hcd *ozhcd = oz_hcd_claim();
1587         int rc = 0;
1588         if (ozhcd == NULL)
1589                 return;
1590         /* This is called from a tasklet so is in softirq context but the urb
1591          * list is filled from any context so we need to lock
1592          * appropriately while removing urbs.
1593          */
1594         spin_lock_irqsave(&g_tasklet_lock, irq_state);
1595         while (!list_empty(&ozhcd->urb_pending_list)) {
1596                 struct oz_urb_link *urbl =
1597                         list_first_entry(&ozhcd->urb_pending_list,
1598                                 struct oz_urb_link, link);
1599                 list_del_init(&urbl->link);
1600                 spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1601                 urb = urbl->urb;
1602                 oz_free_urb_link(urbl);
1603                 rc = oz_urb_process(ozhcd, urb);
1604                 if (rc)
1605                         oz_complete_urb(ozhcd->hcd, urb, rc, 0);
1606                 spin_lock_irqsave(&g_tasklet_lock, irq_state);
1607         }
1608         spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1609         oz_hcd_put(ozhcd);
1610 }
1611 /*------------------------------------------------------------------------------
1612  * This function searches for the urb in any of the lists it could be in.
1613  * If it is found it is removed from the list and completed. If the urb is
1614  * being processed then it won't be in a list so won't be found. However, the
1615  * call to usb_hcd_check_unlink_urb() will set the value of the unlinked field
1616  * to a non-zero value. When an attempt is made to put the urb back in a list
1617  * the unlinked field will be checked and the urb will then be completed.
1618  * Context: tasklet
1619  */
1620 static void oz_urb_cancel(struct oz_port *port, u8 ep_num, struct urb *urb)
1621 {
1622         struct oz_urb_link *urbl = NULL;
1623         struct list_head *e;
1624         struct oz_hcd *ozhcd;
1625         unsigned long irq_state;
1626         u8 ix;
1627         if (port == NULL) {
1628                 oz_trace("ERRORERROR: oz_urb_cancel(%p) port is null\n", urb);
1629                 return;
1630         }
1631         ozhcd = port->ozhcd;
1632         if (ozhcd == NULL) {
1633                 oz_trace("ERRORERROR: oz_urb_cancel(%p) ozhcd is null\n", urb);
1634                 return;
1635         }
1636
1637         /* Look in the tasklet queue.
1638          */
1639         spin_lock_irqsave(&g_tasklet_lock, irq_state);
1640         list_for_each(e, &ozhcd->urb_cancel_list) {
1641                 urbl = container_of(e, struct oz_urb_link, link);
1642                 if (urb == urbl->urb) {
1643                         list_del_init(e);
1644                         spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1645                         goto out2;
1646                 }
1647         }
1648         spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1649         urbl = NULL;
1650
1651         /* Look in the orphanage.
1652          */
1653         spin_lock_irqsave(&ozhcd->hcd_lock, irq_state);
1654         list_for_each(e, &ozhcd->orphanage) {
1655                 urbl = container_of(e, struct oz_urb_link, link);
1656                 if (urbl->urb == urb) {
1657                         list_del(e);
1658                         oz_trace("Found urb in orphanage\n");
1659                         goto out;
1660                 }
1661         }
1662         ix = (ep_num & 0xf);
1663         urbl = NULL;
1664         if ((ep_num & USB_DIR_IN) && ix)
1665                 urbl = oz_remove_urb(port->in_ep[ix], urb);
1666         else
1667                 urbl = oz_remove_urb(port->out_ep[ix], urb);
1668 out:
1669         spin_unlock_irqrestore(&ozhcd->hcd_lock, irq_state);
1670 out2:
1671         if (urbl) {
1672                 urb->actual_length = 0;
1673                 oz_free_urb_link(urbl);
1674                 oz_complete_urb(ozhcd->hcd, urb, -EPIPE, 0);
1675         }
1676 }
1677 /*------------------------------------------------------------------------------
1678  * Context: tasklet
1679  */
1680 static void oz_urb_cancel_tasklet(unsigned long unused)
1681 {
1682         unsigned long irq_state;
1683         struct urb *urb;
1684         struct oz_hcd *ozhcd = oz_hcd_claim();
1685         if (ozhcd == NULL)
1686                 return;
1687         spin_lock_irqsave(&g_tasklet_lock, irq_state);
1688         while (!list_empty(&ozhcd->urb_cancel_list)) {
1689                 struct oz_urb_link *urbl =
1690                         list_first_entry(&ozhcd->urb_cancel_list,
1691                                 struct oz_urb_link, link);
1692                 list_del_init(&urbl->link);
1693                 spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1694                 urb = urbl->urb;
1695                 if (urb->unlinked)
1696                         oz_urb_cancel(urbl->port, urbl->ep_num, urb);
1697                 oz_free_urb_link(urbl);
1698                 spin_lock_irqsave(&g_tasklet_lock, irq_state);
1699         }
1700         spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1701         oz_hcd_put(ozhcd);
1702 }
1703 /*------------------------------------------------------------------------------
1704  * Context: unknown
1705  */
1706 static void oz_hcd_clear_orphanage(struct oz_hcd *ozhcd, int status)
1707 {
1708         if (ozhcd) {
1709                 struct oz_urb_link *urbl;
1710                 while (!list_empty(&ozhcd->orphanage)) {
1711                         urbl = list_first_entry(&ozhcd->orphanage,
1712                                 struct oz_urb_link, link);
1713                         list_del(&urbl->link);
1714                         oz_complete_urb(ozhcd->hcd, urbl->urb, status, 0);
1715                         oz_free_urb_link(urbl);
1716                 }
1717         }
1718 }
1719 /*------------------------------------------------------------------------------
1720  * Context: unknown
1721  */
1722 static int oz_hcd_start(struct usb_hcd *hcd)
1723 {
1724         oz_trace("oz_hcd_start()\n");
1725         hcd->power_budget = 200;
1726         hcd->state = HC_STATE_RUNNING;
1727         hcd->uses_new_polling = 1;
1728         return 0;
1729 }
1730 /*------------------------------------------------------------------------------
1731  * Context: unknown
1732  */
1733 static void oz_hcd_stop(struct usb_hcd *hcd)
1734 {
1735         oz_trace("oz_hcd_stop()\n");
1736 }
1737 /*------------------------------------------------------------------------------
1738  * Context: unknown
1739  */
1740 static void oz_hcd_shutdown(struct usb_hcd *hcd)
1741 {
1742         oz_trace("oz_hcd_shutdown()\n");
1743 }
1744 /*------------------------------------------------------------------------------
1745  * Context: any
1746  */
1747 #ifdef WANT_EVENT_TRACE
1748 static u8 oz_get_irq_ctx(void)
1749 {
1750         u8 irq_info = 0;
1751         if (in_interrupt())
1752                 irq_info |= 1;
1753         if (in_irq())
1754                 irq_info |= 2;
1755         return irq_info;
1756 }
1757 #endif /* WANT_EVENT_TRACE */
1758 /*------------------------------------------------------------------------------
1759  * Called to queue an urb for the device.
1760  * This function should return a non-zero error code if it fails the urb but
1761  * should not call usb_hcd_giveback_urb().
1762  * Context: any
1763  */
1764 static int oz_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
1765                                 gfp_t mem_flags)
1766 {
1767         struct oz_hcd *ozhcd = oz_hcd_private(hcd);
1768         int rc = 0;
1769         int port_ix;
1770         struct oz_port *port;
1771         unsigned long irq_state;
1772         struct oz_urb_link *urbl;
1773         oz_trace2(OZ_TRACE_URB, "%lu: oz_hcd_urb_enqueue(%p)\n",
1774                 jiffies, urb);
1775         oz_event_log(OZ_EVT_URB_SUBMIT, oz_get_irq_ctx(),
1776                 (u16)urb->number_of_packets, urb, urb->pipe);
1777         if (unlikely(ozhcd == NULL)) {
1778                 oz_trace2(OZ_TRACE_URB, "%lu: Refused urb(%p) not ozhcd.\n",
1779                         jiffies, urb);
1780                 return -EPIPE;
1781         }
1782         if (unlikely(hcd->state != HC_STATE_RUNNING)) {
1783                 oz_trace2(OZ_TRACE_URB, "%lu: Refused urb(%p) not running.\n",
1784                         jiffies, urb);
1785                 return -EPIPE;
1786         }
1787         port_ix = oz_get_port_from_addr(ozhcd, urb->dev->devnum);
1788         if (port_ix < 0)
1789                 return -EPIPE;
1790         port =  &ozhcd->ports[port_ix];
1791         if (port == NULL)
1792                 return -EPIPE;
1793         if ((port->flags & OZ_PORT_F_PRESENT) == 0) {
1794                 oz_trace("Refusing URB port_ix = %d devnum = %d\n",
1795                         port_ix, urb->dev->devnum);
1796                 return -EPIPE;
1797         }
1798         urb->hcpriv = port;
1799         /* Put request in queue for processing by tasklet.
1800          */
1801         urbl = oz_alloc_urb_link();
1802         if (unlikely(urbl == NULL))
1803                 return -ENOMEM;
1804         urbl->urb = urb;
1805         spin_lock_irqsave(&g_tasklet_lock, irq_state);
1806         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1807         if (unlikely(rc)) {
1808                 spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1809                 oz_free_urb_link(urbl);
1810                 return rc;
1811         }
1812         list_add_tail(&urbl->link, &ozhcd->urb_pending_list);
1813         spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1814         tasklet_schedule(&g_urb_process_tasklet);
1815         atomic_inc(&g_pending_urbs);
1816         return 0;
1817 }
1818 /*------------------------------------------------------------------------------
1819  * Context: tasklet
1820  */
1821 static struct oz_urb_link *oz_remove_urb(struct oz_endpoint *ep,
1822                                 struct urb *urb)
1823 {
1824         struct oz_urb_link *urbl = NULL;
1825         struct list_head *e;
1826         if (unlikely(ep == NULL))
1827                 return NULL;
1828         list_for_each(e, &ep->urb_list) {
1829                 urbl = container_of(e, struct oz_urb_link, link);
1830                 if (urbl->urb == urb) {
1831                         list_del_init(e);
1832                         if (usb_pipeisoc(urb->pipe)) {
1833                                 ep->credit -= urb->number_of_packets;
1834                                 if (ep->credit < 0)
1835                                         ep->credit = 0;
1836                                 oz_event_log(OZ_EVT_EP_CREDIT,
1837                                         usb_pipein(urb->pipe) ?
1838                                         (ep->ep_num | USB_DIR_IN) : ep->ep_num,
1839                                         0, NULL, ep->credit);
1840                         }
1841                         return urbl;
1842                 }
1843         }
1844         return NULL;
1845 }
1846 /*------------------------------------------------------------------------------
1847  * Called to dequeue a previously submitted urb for the device.
1848  * Context: any
1849  */
1850 static int oz_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1851 {
1852         struct oz_hcd *ozhcd = oz_hcd_private(hcd);
1853         struct oz_urb_link *urbl = NULL;
1854         int rc;
1855         unsigned long irq_state;
1856         oz_trace2(OZ_TRACE_URB, "%lu: oz_hcd_urb_dequeue(%p)\n", jiffies, urb);
1857         urbl = oz_alloc_urb_link();
1858         if (unlikely(urbl == NULL))
1859                 return -ENOMEM;
1860         spin_lock_irqsave(&g_tasklet_lock, irq_state);
1861         /* The following function checks the urb is still in the queue
1862          * maintained by the core and that the unlinked field is zero.
1863          * If both are true the function sets the unlinked field and returns
1864          * zero. Otherwise it returns an error.
1865          */
1866         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1867         /* We have to check we haven't completed the urb or are about
1868          * to complete it. When we do we set hcpriv to 0 so if this has
1869          * already happened we don't put the urb in the cancel queue.
1870          */
1871         if ((rc == 0) && urb->hcpriv) {
1872                 urbl->urb = urb;
1873                 urbl->port = (struct oz_port *)urb->hcpriv;
1874                 urbl->ep_num = usb_pipeendpoint(urb->pipe);
1875                 if (usb_pipein(urb->pipe))
1876                         urbl->ep_num |= USB_DIR_IN;
1877                 list_add_tail(&urbl->link, &ozhcd->urb_cancel_list);
1878                 spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1879                 tasklet_schedule(&g_urb_cancel_tasklet);
1880         } else {
1881                 spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
1882                 oz_free_urb_link(urbl);
1883         }
1884         return rc;
1885 }
1886 /*------------------------------------------------------------------------------
1887  * Context: unknown
1888  */
1889 static void oz_hcd_endpoint_disable(struct usb_hcd *hcd,
1890                                 struct usb_host_endpoint *ep)
1891 {
1892         oz_trace("oz_hcd_endpoint_disable\n");
1893 }
1894 /*------------------------------------------------------------------------------
1895  * Context: unknown
1896  */
1897 static void oz_hcd_endpoint_reset(struct usb_hcd *hcd,
1898                                 struct usb_host_endpoint *ep)
1899 {
1900         oz_trace("oz_hcd_endpoint_reset\n");
1901 }
1902 /*------------------------------------------------------------------------------
1903  * Context: unknown
1904  */
1905 static int oz_hcd_get_frame_number(struct usb_hcd *hcd)
1906 {
1907         oz_trace("oz_hcd_get_frame_number\n");
1908         return oz_usb_get_frame_number();
1909 }
1910 /*------------------------------------------------------------------------------
1911  * Context: softirq
1912  * This is called as a consquence of us calling usb_hcd_poll_rh_status() and we
1913  * always do that in softirq context.
1914  */
1915 static int oz_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
1916 {
1917         struct oz_hcd *ozhcd = oz_hcd_private(hcd);
1918         int i;
1919
1920         oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_status_data()\n");
1921         buf[0] = 0;
1922
1923         spin_lock_bh(&ozhcd->hcd_lock);
1924         for (i = 0; i < OZ_NB_PORTS; i++) {
1925                 if (ozhcd->ports[i].flags & OZ_PORT_F_CHANGED) {
1926                         oz_trace2(OZ_TRACE_HUB, "Port %d changed\n", i);
1927                         ozhcd->ports[i].flags &= ~OZ_PORT_F_CHANGED;
1928                         buf[0] |= 1<<(i+1);
1929                 }
1930         }
1931         spin_unlock_bh(&ozhcd->hcd_lock);
1932         return buf[0] ? 1 : 0;
1933 }
1934 /*------------------------------------------------------------------------------
1935  * Context: process
1936  */
1937 static void oz_get_hub_descriptor(struct usb_hcd *hcd,
1938                                 struct usb_hub_descriptor *desc)
1939 {
1940         oz_trace2(OZ_TRACE_HUB, "GetHubDescriptor\n");
1941         memset(desc, 0, sizeof(*desc));
1942         desc->bDescriptorType = 0x29;
1943         desc->bDescLength = 9;
1944         desc->wHubCharacteristics = (__force __u16)
1945                         __constant_cpu_to_le16(0x0001);
1946         desc->bNbrPorts = OZ_NB_PORTS;
1947 }
1948 /*------------------------------------------------------------------------------
1949  * Context: process
1950  */
1951 static int oz_set_port_feature(struct usb_hcd *hcd, u16 wvalue, u16 windex)
1952 {
1953         struct oz_port *port;
1954         int err = 0;
1955         u8 port_id = (u8)windex;
1956         struct oz_hcd *ozhcd = oz_hcd_private(hcd);
1957         unsigned set_bits = 0;
1958         unsigned clear_bits = 0;
1959         oz_trace2(OZ_TRACE_HUB, "SetPortFeature\n");
1960         if ((port_id < 1) || (port_id > OZ_NB_PORTS))
1961                 return -EPIPE;
1962         port = &ozhcd->ports[port_id-1];
1963         switch (wvalue) {
1964         case USB_PORT_FEAT_CONNECTION:
1965                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_CONNECTION\n");
1966                 break;
1967         case USB_PORT_FEAT_ENABLE:
1968                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_ENABLE\n");
1969                 break;
1970         case USB_PORT_FEAT_SUSPEND:
1971                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_SUSPEND\n");
1972                 break;
1973         case USB_PORT_FEAT_OVER_CURRENT:
1974                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_OVER_CURRENT\n");
1975                 break;
1976         case USB_PORT_FEAT_RESET:
1977                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_RESET\n");
1978                 set_bits = USB_PORT_STAT_ENABLE | (USB_PORT_STAT_C_RESET<<16);
1979                 clear_bits = USB_PORT_STAT_RESET;
1980                 ozhcd->ports[port_id-1].bus_addr = 0;
1981                 break;
1982         case USB_PORT_FEAT_POWER:
1983                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_POWER\n");
1984                 set_bits |= USB_PORT_STAT_POWER;
1985                 break;
1986         case USB_PORT_FEAT_LOWSPEED:
1987                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_LOWSPEED\n");
1988                 break;
1989         case USB_PORT_FEAT_C_CONNECTION:
1990                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_CONNECTION\n");
1991                 break;
1992         case USB_PORT_FEAT_C_ENABLE:
1993                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_ENABLE\n");
1994                 break;
1995         case USB_PORT_FEAT_C_SUSPEND:
1996                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_SUSPEND\n");
1997                 break;
1998         case USB_PORT_FEAT_C_OVER_CURRENT:
1999                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_OVER_CURRENT\n");
2000                 break;
2001         case USB_PORT_FEAT_C_RESET:
2002                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_RESET\n");
2003                 break;
2004         case USB_PORT_FEAT_TEST:
2005                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_TEST\n");
2006                 break;
2007         case USB_PORT_FEAT_INDICATOR:
2008                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_INDICATOR\n");
2009                 break;
2010         default:
2011                 oz_trace2(OZ_TRACE_HUB, "Other %d\n", wvalue);
2012                 break;
2013         }
2014         if (set_bits || clear_bits) {
2015                 spin_lock_bh(&port->port_lock);
2016                 port->status &= ~clear_bits;
2017                 port->status |= set_bits;
2018                 spin_unlock_bh(&port->port_lock);
2019         }
2020         oz_trace2(OZ_TRACE_HUB, "Port[%d] status = 0x%x\n", port_id,
2021                 port->status);
2022         return err;
2023 }
2024 /*------------------------------------------------------------------------------
2025  * Context: process
2026  */
2027 static int oz_clear_port_feature(struct usb_hcd *hcd, u16 wvalue, u16 windex)
2028 {
2029         struct oz_port *port;
2030         int err = 0;
2031         u8 port_id = (u8)windex;
2032         struct oz_hcd *ozhcd = oz_hcd_private(hcd);
2033         unsigned clear_bits = 0;
2034         oz_trace2(OZ_TRACE_HUB, "ClearPortFeature\n");
2035         if ((port_id < 1) || (port_id > OZ_NB_PORTS))
2036                 return -EPIPE;
2037         port = &ozhcd->ports[port_id-1];
2038         switch (wvalue) {
2039         case USB_PORT_FEAT_CONNECTION:
2040                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_CONNECTION\n");
2041                 break;
2042         case USB_PORT_FEAT_ENABLE:
2043                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_ENABLE\n");
2044                 clear_bits = USB_PORT_STAT_ENABLE;
2045                 break;
2046         case USB_PORT_FEAT_SUSPEND:
2047                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_SUSPEND\n");
2048                 break;
2049         case USB_PORT_FEAT_OVER_CURRENT:
2050                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_OVER_CURRENT\n");
2051                 break;
2052         case USB_PORT_FEAT_RESET:
2053                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_RESET\n");
2054                 break;
2055         case USB_PORT_FEAT_POWER:
2056                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_POWER\n");
2057                 clear_bits |= USB_PORT_STAT_POWER;
2058                 break;
2059         case USB_PORT_FEAT_LOWSPEED:
2060                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_LOWSPEED\n");
2061                 break;
2062         case USB_PORT_FEAT_C_CONNECTION:
2063                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_CONNECTION\n");
2064                 clear_bits = (USB_PORT_STAT_C_CONNECTION << 16);
2065                 break;
2066         case USB_PORT_FEAT_C_ENABLE:
2067                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_ENABLE\n");
2068                 clear_bits = (USB_PORT_STAT_C_ENABLE << 16);
2069                 break;
2070         case USB_PORT_FEAT_C_SUSPEND:
2071                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_SUSPEND\n");
2072                 break;
2073         case USB_PORT_FEAT_C_OVER_CURRENT:
2074                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_OVER_CURRENT\n");
2075                 break;
2076         case USB_PORT_FEAT_C_RESET:
2077                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_RESET\n");
2078                 clear_bits = (USB_PORT_FEAT_C_RESET << 16);
2079                 break;
2080         case USB_PORT_FEAT_TEST:
2081                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_TEST\n");
2082                 break;
2083         case USB_PORT_FEAT_INDICATOR:
2084                 oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_INDICATOR\n");
2085                 break;
2086         default:
2087                 oz_trace2(OZ_TRACE_HUB, "Other %d\n", wvalue);
2088                 break;
2089         }
2090         if (clear_bits) {
2091                 spin_lock_bh(&port->port_lock);
2092                 port->status &= ~clear_bits;
2093                 spin_unlock_bh(&port->port_lock);
2094         }
2095         oz_trace2(OZ_TRACE_HUB, "Port[%d] status = 0x%x\n", port_id,
2096                 ozhcd->ports[port_id-1].status);
2097         return err;
2098 }
2099 /*------------------------------------------------------------------------------
2100  * Context: process
2101  */
2102 static int oz_get_port_status(struct usb_hcd *hcd, u16 windex, char *buf)
2103 {
2104         struct oz_hcd *ozhcd;
2105         u32 status = 0;
2106         if ((windex < 1) || (windex > OZ_NB_PORTS))
2107                 return -EPIPE;
2108         ozhcd = oz_hcd_private(hcd);
2109         oz_trace2(OZ_TRACE_HUB, "GetPortStatus windex = %d\n", windex);
2110         status = ozhcd->ports[windex-1].status;
2111         put_unaligned(cpu_to_le32(status), (__le32 *)buf);
2112         oz_trace2(OZ_TRACE_HUB, "Port[%d] status = %x\n", windex, status);
2113         return 0;
2114 }
2115 /*------------------------------------------------------------------------------
2116  * Context: process
2117  */
2118 static int oz_hcd_hub_control(struct usb_hcd *hcd, u16 req_type, u16 wvalue,
2119                                 u16 windex, char *buf, u16 wlength)
2120 {
2121         int err = 0;
2122         oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_control()\n");
2123         switch (req_type) {
2124         case ClearHubFeature:
2125                 oz_trace2(OZ_TRACE_HUB, "ClearHubFeature: %d\n", req_type);
2126                 break;
2127         case ClearPortFeature:
2128                 err = oz_clear_port_feature(hcd, wvalue, windex);
2129                 break;
2130         case GetHubDescriptor:
2131                 oz_get_hub_descriptor(hcd, (struct usb_hub_descriptor *)buf);
2132                 break;
2133         case GetHubStatus:
2134                 oz_trace2(OZ_TRACE_HUB, "GetHubStatus: req_type = 0x%x\n",
2135                         req_type);
2136                 put_unaligned(__constant_cpu_to_le32(0), (__le32 *)buf);
2137                 break;
2138         case GetPortStatus:
2139                 err = oz_get_port_status(hcd, windex, buf);
2140                 break;
2141         case SetHubFeature:
2142                 oz_trace2(OZ_TRACE_HUB, "SetHubFeature: %d\n", req_type);
2143                 break;
2144         case SetPortFeature:
2145                 err = oz_set_port_feature(hcd, wvalue, windex);
2146                 break;
2147         default:
2148                 oz_trace2(OZ_TRACE_HUB, "Other: %d\n", req_type);
2149                 break;
2150         }
2151         return err;
2152 }
2153 /*------------------------------------------------------------------------------
2154  * Context: process
2155  */
2156 static int oz_hcd_bus_suspend(struct usb_hcd *hcd)
2157 {
2158         struct oz_hcd *ozhcd;
2159         oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_suspend()\n");
2160         ozhcd = oz_hcd_private(hcd);
2161         spin_lock_bh(&ozhcd->hcd_lock);
2162         hcd->state = HC_STATE_SUSPENDED;
2163         ozhcd->flags |= OZ_HDC_F_SUSPENDED;
2164         spin_unlock_bh(&ozhcd->hcd_lock);
2165         return 0;
2166 }
2167 /*------------------------------------------------------------------------------
2168  * Context: process
2169  */
2170 static int oz_hcd_bus_resume(struct usb_hcd *hcd)
2171 {
2172         struct oz_hcd *ozhcd;
2173         oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_resume()\n");
2174         ozhcd = oz_hcd_private(hcd);
2175         spin_lock_bh(&ozhcd->hcd_lock);
2176         ozhcd->flags &= ~OZ_HDC_F_SUSPENDED;
2177         hcd->state = HC_STATE_RUNNING;
2178         spin_unlock_bh(&ozhcd->hcd_lock);
2179         return 0;
2180 }
2181 /*------------------------------------------------------------------------------
2182  */
2183 static void oz_plat_shutdown(struct platform_device *dev)
2184 {
2185         oz_trace("oz_plat_shutdown()\n");
2186 }
2187 /*------------------------------------------------------------------------------
2188  * Context: process
2189  */
2190 static int oz_plat_probe(struct platform_device *dev)
2191 {
2192         int i;
2193         int err;
2194         struct usb_hcd *hcd;
2195         struct oz_hcd *ozhcd;
2196         oz_trace("oz_plat_probe()\n");
2197         hcd = usb_create_hcd(&g_oz_hc_drv, &dev->dev, dev_name(&dev->dev));
2198         if (hcd == NULL) {
2199                 oz_trace("Failed to created hcd object OK\n");
2200                 return -ENOMEM;
2201         }
2202         ozhcd = oz_hcd_private(hcd);
2203         memset(ozhcd, 0, sizeof(*ozhcd));
2204         INIT_LIST_HEAD(&ozhcd->urb_pending_list);
2205         INIT_LIST_HEAD(&ozhcd->urb_cancel_list);
2206         INIT_LIST_HEAD(&ozhcd->orphanage);
2207         ozhcd->hcd = hcd;
2208         ozhcd->conn_port = -1;
2209         spin_lock_init(&ozhcd->hcd_lock);
2210         for (i = 0; i < OZ_NB_PORTS; i++) {
2211                 struct oz_port *port = &ozhcd->ports[i];
2212                 port->ozhcd = ozhcd;
2213                 port->flags = 0;
2214                 port->status = 0;
2215                 port->bus_addr = 0xff;
2216                 spin_lock_init(&port->port_lock);
2217         }
2218         err = usb_add_hcd(hcd, 0, 0);
2219         if (err) {
2220                 oz_trace("Failed to add hcd object OK\n");
2221                 usb_put_hcd(hcd);
2222                 return -1;
2223         }
2224         spin_lock_bh(&g_hcdlock);
2225         g_ozhcd = ozhcd;
2226         spin_unlock_bh(&g_hcdlock);
2227         return 0;
2228 }
2229 /*------------------------------------------------------------------------------
2230  * Context: unknown
2231  */
2232 static int oz_plat_remove(struct platform_device *dev)
2233 {
2234         struct usb_hcd *hcd = platform_get_drvdata(dev);
2235         struct oz_hcd *ozhcd;
2236         oz_trace("oz_plat_remove()\n");
2237         if (hcd == NULL)
2238                 return -1;
2239         ozhcd = oz_hcd_private(hcd);
2240         spin_lock_bh(&g_hcdlock);
2241         if (ozhcd == g_ozhcd)
2242                 g_ozhcd = NULL;
2243         spin_unlock_bh(&g_hcdlock);
2244         oz_trace("Clearing orphanage\n");
2245         oz_hcd_clear_orphanage(ozhcd, -EPIPE);
2246         oz_trace("Removing hcd\n");
2247         usb_remove_hcd(hcd);
2248         usb_put_hcd(hcd);
2249         oz_empty_link_pool();
2250         return 0;
2251 }
2252 /*------------------------------------------------------------------------------
2253  * Context: unknown
2254  */
2255 static int oz_plat_suspend(struct platform_device *dev, pm_message_t msg)
2256 {
2257         oz_trace("oz_plat_suspend()\n");
2258         return 0;
2259 }
2260 /*------------------------------------------------------------------------------
2261  * Context: unknown
2262  */
2263 static int oz_plat_resume(struct platform_device *dev)
2264 {
2265         oz_trace("oz_plat_resume()\n");
2266         return 0;
2267 }
2268 /*------------------------------------------------------------------------------
2269  * Context: process
2270  */
2271 int oz_hcd_init(void)
2272 {
2273         int err;
2274         if (usb_disabled())
2275                 return -ENODEV;
2276         tasklet_init(&g_urb_process_tasklet, oz_urb_process_tasklet, 0);
2277         tasklet_init(&g_urb_cancel_tasklet, oz_urb_cancel_tasklet, 0);
2278         err = platform_driver_register(&g_oz_plat_drv);
2279         oz_trace("platform_driver_register() returned %d\n", err);
2280         if (err)
2281                 goto error;
2282         g_plat_dev = platform_device_alloc(OZ_PLAT_DEV_NAME, -1);
2283         if (g_plat_dev == NULL) {
2284                 err = -ENOMEM;
2285                 goto error1;
2286         }
2287         oz_trace("platform_device_alloc() succeeded\n");
2288         err = platform_device_add(g_plat_dev);
2289         if (err)
2290                 goto error2;
2291         oz_trace("platform_device_add() succeeded\n");
2292         return 0;
2293 error2:
2294         platform_device_put(g_plat_dev);
2295 error1:
2296         platform_driver_unregister(&g_oz_plat_drv);
2297 error:
2298         tasklet_disable(&g_urb_process_tasklet);
2299         tasklet_disable(&g_urb_cancel_tasklet);
2300         oz_trace("oz_hcd_init() failed %d\n", err);
2301         return err;
2302 }
2303 /*------------------------------------------------------------------------------
2304  * Context: process
2305  */
2306 void oz_hcd_term(void)
2307 {
2308         tasklet_kill(&g_urb_process_tasklet);
2309         tasklet_kill(&g_urb_cancel_tasklet);
2310         platform_device_unregister(g_plat_dev);
2311         platform_driver_unregister(&g_oz_plat_drv);
2312         oz_trace("Pending urbs:%d\n", atomic_read(&g_pending_urbs));
2313 }