drivers/usb/renesas_usbhs/mod_gadget.c

   1 /*
   2  * Renesas USB driver
   3  *
   4  * Copyright (C) 2011 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  15  *
  16  */
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/usb/ch9.h>
  21 #include <linux/usb/gadget.h>
  22 #include "common.h"
  23
  24 /*
  25  *              struct
  26  */
  27 struct usbhsg_request {
  28         struct usb_request      req;
  29         struct list_head        node;
  30         struct usbhs_pkt        pkt;
  31 };
  32
  33 #define EP_NAME_SIZE 8
  34 struct usbhsg_gpriv;
  35 struct usbhsg_pipe_handle;
  36 struct usbhsg_uep {
  37         struct usb_ep            ep;
  38         struct usbhs_pipe       *pipe;
  39         struct list_head         list;
  40
  41         char ep_name[EP_NAME_SIZE];
  42
  43         struct usbhsg_gpriv *gpriv;
  44         struct usbhsg_pipe_handle *handler;
  45 };
  46
  47 struct usbhsg_gpriv {
  48         struct usb_gadget        gadget;
  49         struct usbhs_mod         mod;
  50
  51         struct usbhsg_uep       *uep;
  52         int                      uep_size;
  53
  54         struct usb_gadget_driver        *driver;
  55
  56         u32     status;
  57 #define USBHSG_STATUS_STARTED           (1 << 0)
  58 #define USBHSG_STATUS_REGISTERD         (1 << 1)
  59 #define USBHSG_STATUS_WEDGE             (1 << 2)
  60 };
  61
  62 struct usbhsg_pipe_handle {
  63         int (*prepare)(struct usbhsg_uep *uep, struct usbhsg_request *ureq);
  64         int (*try_run)(struct usbhsg_uep *uep, struct usbhsg_request *ureq);
  65         void (*irq_mask)(struct usbhsg_uep *uep, int enable);
  66 };
  67
  68 struct usbhsg_recip_handle {
  69         char *name;
  70         int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  71                       struct usb_ctrlrequest *ctrl);
  72         int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  73                          struct usb_ctrlrequest *ctrl);
  74         int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  75                         struct usb_ctrlrequest *ctrl);
  76 };
  77
  78 /*
  79  *              macro
  80  */
  81 #define usbhsg_priv_to_gpriv(priv)                      \
  82         container_of(                                   \
  83                 usbhs_mod_get(priv, USBHS_GADGET),      \
  84                 struct usbhsg_gpriv, mod)
  85
  86 #define __usbhsg_for_each_uep(start, pos, g, i) \
  87         for (i = start, pos = (g)->uep;         \
  88              i < (g)->uep_size;                 \
  89              i++, pos = (g)->uep + i)
  90
  91 #define usbhsg_for_each_uep(pos, gpriv, i)      \
  92         __usbhsg_for_each_uep(1, pos, gpriv, i)
  93
  94 #define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)     \
  95         __usbhsg_for_each_uep(0, pos, gpriv, i)
  96
  97 #define usbhsg_gadget_to_gpriv(g)\
  98         container_of(g, struct usbhsg_gpriv, gadget)
  99
 100 #define usbhsg_req_to_ureq(r)\
 101         container_of(r, struct usbhsg_request, req)
 102
 103 #define usbhsg_ep_to_uep(e)             container_of(e, struct usbhsg_uep, ep)
 104 #define usbhsg_gpriv_to_lock(gp)        usbhs_priv_to_lock((gp)->mod.priv)
 105 #define usbhsg_gpriv_to_dev(gp)         usbhs_priv_to_dev((gp)->mod.priv)
 106 #define usbhsg_gpriv_to_priv(gp)        ((gp)->mod.priv)
 107 #define usbhsg_gpriv_to_dcp(gp)         ((gp)->uep)
 108 #define usbhsg_gpriv_to_nth_uep(gp, i)  ((gp)->uep + i)
 109 #define usbhsg_uep_to_gpriv(u)          ((u)->gpriv)
 110 #define usbhsg_uep_to_pipe(u)           ((u)->pipe)
 111 #define usbhsg_pipe_to_uep(p)           ((p)->mod_private)
 112 #define usbhsg_is_dcp(u)                ((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
 113
 114 #define usbhsg_ureq_to_pkt(u)           (&(u)->pkt)
 115 #define usbhsg_pkt_to_ureq(i)   \
 116         container_of(i, struct usbhsg_request, pkt)
 117
 118 #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
 119
 120 /* status */
 121 #define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
 122 #define usbhsg_status_set(gp, b) (gp->status |=  b)
 123 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
 124 #define usbhsg_status_has(gp, b) (gp->status &   b)
 125
 126 /*
 127  *              usbhsg_trylock
 128  *
 129  * This driver don't use spin_try_lock
 130  * to avoid warning of CONFIG_DEBUG_SPINLOCK
 131  */
 132 static spinlock_t *usbhsg_trylock(struct usbhsg_gpriv *gpriv,
 133                                   unsigned long *flags)
 134 {
 135         spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
 136
 137         /* check spin lock status
 138          * to avoid deadlock/nest */
 139         if (spin_is_locked(lock))
 140                 return NULL;
 141
 142         spin_lock_irqsave(lock, *flags);
 143
 144         return lock;
 145 }
 146
 147 static void usbhsg_unlock(spinlock_t *lock, unsigned long *flags)
 148 {
 149         if (!lock)
 150                 return;
 151
 152         spin_unlock_irqrestore(lock, *flags);
 153 }
 154
 155 /*
 156  *              list push/pop
 157  */
 158 static void usbhsg_queue_push(struct usbhsg_uep *uep,
 159                               struct usbhsg_request *ureq)
 160 {
 161         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 162         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 163         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 164
 165         /*
 166          *********  assume under spin lock  *********
 167          */
 168         list_del_init(&ureq->node);
 169         list_add_tail(&ureq->node, &uep->list);
 170         ureq->req.actual = 0;
 171         ureq->req.status = -EINPROGRESS;
 172
 173         dev_dbg(dev, "pipe %d : queue push (%d)\n",
 174                 usbhs_pipe_number(pipe),
 175                 ureq->req.length);
 176 }
 177
 178 static struct usbhsg_request *usbhsg_queue_get(struct usbhsg_uep *uep)
 179 {
 180         /*
 181          *********  assume under spin lock  *********
 182          */
 183         if (list_empty(&uep->list))
 184                 return NULL;
 185
 186         return list_entry(uep->list.next, struct usbhsg_request, node);
 187 }
 188
 189 #define usbhsg_queue_prepare(uep) __usbhsg_queue_handler(uep, 1);
 190 #define usbhsg_queue_handle(uep)  __usbhsg_queue_handler(uep, 0);
 191 static int __usbhsg_queue_handler(struct usbhsg_uep *uep, int prepare)
 192 {
 193         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 194         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 195         struct usbhsg_request *ureq;
 196         spinlock_t *lock;
 197         unsigned long flags;
 198         int ret = 0;
 199
 200         if (!uep->handler) {
 201                 dev_err(dev, "no handler function\n");
 202                 return -EIO;
 203         }
 204
 205         /*
 206          * CAUTION [*queue handler*]
 207          *
 208          * This function will be called for start/restart queue operation.
 209          * OTOH the most much worry for USB driver is spinlock nest.
 210          * Specially it are
 211          *   - usb_ep_ops  :: queue
 212          *   - usb_request :: complete
 213          *
 214          * But the caller of this function need not care about spinlock.
 215          * This function is using usbhsg_trylock for it.
 216          * if "is_locked" is 1, this mean this function lock it.
 217          * but if it is 0, this mean it is already under spin lock.
 218          * see also
 219          *   CAUTION [*endpoint queue*]
 220          *   CAUTION [*request complete*]
 221          */
 222
 223         /******************  spin try lock *******************/
 224         lock = usbhsg_trylock(gpriv, &flags);
 225
 226         ureq = usbhsg_queue_get(uep);
 227         if (ureq) {
 228                 if (prepare)
 229                         ret = uep->handler->prepare(uep, ureq);
 230                 else
 231                         ret = uep->handler->try_run(uep, ureq);
 232         }
 233         usbhsg_unlock(lock, &flags);
 234         /********************  spin unlock ******************/
 235
 236         return ret;
 237 }
 238
 239 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
 240                              struct usbhsg_request *ureq,
 241                              int status)
 242 {
 243         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 244         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 245         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 246
 247         /*
 248          *********  assume under spin lock  *********
 249          */
 250
 251         /*
 252          * CAUTION [*request complete*]
 253          *
 254          * There is a possibility not to be called in correct order
 255          * if "complete" is called without spinlock.
 256          *
 257          * So, this function assume it is under spinlock,
 258          * and call usb_request :: complete.
 259          *
 260          * But this "complete" will push next usb_request.
 261          * It mean "usb_ep_ops :: queue" which is using spinlock is called
 262          * under spinlock.
 263          *
 264          * To avoid dead-lock, this driver is using usbhsg_trylock.
 265          *   CAUTION [*endpoint queue*]
 266          *   CAUTION [*queue handler*]
 267          */
 268
 269         dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
 270
 271         list_del_init(&ureq->node);
 272
 273         ureq->req.status = status;
 274         ureq->req.complete(&uep->ep, &ureq->req);
 275
 276         /* more request ? */
 277         if (0 == status)
 278                 usbhsg_queue_prepare(uep);
 279 }
 280
 281 /*
 282  *              irq enable/disable function
 283  */
 284 #define usbhsg_irq_callback_ctrl(uep, status, enable)                   \
 285         ({                                                              \
 286                 struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);  \
 287                 struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);      \
 288                 struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);  \
 289                 struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
 290                 if (!mod)                                               \
 291                         return;                                         \
 292                 if (enable)                                             \
 293                         mod->irq_##status |= (1 << usbhs_pipe_number(pipe)); \
 294                 else                                                    \
 295                         mod->irq_##status &= ~(1 << usbhs_pipe_number(pipe)); \
 296                 usbhs_irq_callback_update(priv, mod);                   \
 297         })
 298
 299 static void usbhsg_irq_empty_ctrl(struct usbhsg_uep *uep, int enable)
 300 {
 301         usbhsg_irq_callback_ctrl(uep, bempsts, enable);
 302 }
 303
 304 static void usbhsg_irq_ready_ctrl(struct usbhsg_uep *uep, int enable)
 305 {
 306         usbhsg_irq_callback_ctrl(uep, brdysts, enable);
 307 }
 308
 309 /*
 310  *              handler function
 311  */
 312 static int usbhsg_try_run_ctrl_stage_end(struct usbhsg_uep *uep,
 313                                          struct usbhsg_request *ureq)
 314 {
 315         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 316
 317         /*
 318          *********  assume under spin lock  *********
 319          */
 320
 321         usbhs_dcp_control_transfer_done(pipe);
 322         usbhsg_queue_pop(uep, ureq, 0);
 323
 324         return 0;
 325 }
 326
 327 /*
 328  *              packet send hander
 329  */
 330 static void usbhsg_try_run_send_packet_bh(struct usbhs_pkt *pkt)
 331 {
 332         struct usbhs_pipe *pipe = pkt->pipe;
 333         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 334         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 335         struct usb_request *req = &ureq->req;
 336         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 337         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 338         int remainder, send, maxp;
 339         int is_done = 0;
 340         int enable;
 341
 342         maxp            = pkt->maxp;
 343         send            = pkt->actual;
 344         remainder       = pkt->length;
 345
 346         /*
 347          * send = 0 : send zero packet
 348          * send > 0 : send data
 349          *
 350          * send <= max_packet
 351          */
 352         req->actual += send;
 353
 354         /* send all packet ? */
 355         if (send < remainder)
 356                 is_done = 0;            /* there are remainder data */
 357         else if (send < maxp)
 358                 is_done = 1;            /* short packet */
 359         else
 360                 is_done = !req->zero;   /* send zero packet ? */
 361
 362         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 363                 usbhs_pipe_number(pipe),
 364                 remainder, send, is_done, req->zero);
 365
 366         /*
 367          * enable interrupt and send again in irq handler
 368          * if it still have remainder data which should be sent.
 369          */
 370         enable = !is_done;
 371         uep->handler->irq_mask(uep, enable);
 372
 373         /*
 374          * all data were sent ?
 375          */
 376         if (is_done) {
 377                 /* it care below call in
 378                    "function mode" */
 379                 if (usbhsg_is_dcp(uep))
 380                         usbhs_dcp_control_transfer_done(pipe);
 381
 382                 usbhsg_queue_pop(uep, ureq, 0);
 383         }
 384 }
 385
 386 static int usbhsg_try_run_send_packet(struct usbhsg_uep *uep,
 387                                       struct usbhsg_request *ureq)
 388 {
 389         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 390         struct usb_request *req = &ureq->req;
 391         struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
 392         int ret;
 393
 394         /*
 395          *********  assume under spin lock  *********
 396          */
 397
 398         usbhs_pkt_update(pkt, pipe,
 399                          req->buf    + req->actual,
 400                          req->length - req->actual);
 401
 402         ret = usbhs_fifo_write(pkt);
 403         if (ret < 0) {
 404                 /* pipe is busy.
 405                  * retry in interrupt */
 406                 uep->handler->irq_mask(uep, 1);
 407         }
 408
 409         return 0;
 410 }
 411
 412 static int usbhsg_prepare_send_packet(struct usbhsg_uep *uep,
 413                                       struct usbhsg_request *ureq)
 414 {
 415         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 416
 417         /*
 418          *********  assume under spin lock  *********
 419          */
 420
 421         usbhs_fifo_prepare_write(pipe);
 422         usbhsg_try_run_send_packet(uep, ureq);
 423
 424         return 0;
 425 }
 426
 427 /*
 428  *              packet recv hander
 429  */
 430 static void usbhsg_try_run_receive_packet_bh(struct usbhs_pkt *pkt)
 431 {
 432         struct usbhs_pipe *pipe = pkt->pipe;
 433         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 434         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 435         struct usb_request *req = &ureq->req;
 436         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 437         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 438         int remainder, recv, maxp;
 439         int is_done = 0;
 440
 441         maxp            = pkt->maxp;
 442         remainder       = pkt->length;
 443         recv            = pkt->actual;
 444
 445         /*
 446          * recv < 0  : pipe busy
 447          * recv >= 0 : receive data
 448          *
 449          * recv <= max_packet
 450          */
 451
 452         /* update parameters */
 453         req->actual += recv;
 454
 455         if ((recv == remainder) ||      /* receive all data */
 456             (recv < maxp))              /* short packet */
 457                 is_done = 1;
 458
 459         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 460                 usbhs_pipe_number(pipe),
 461                 remainder, recv, is_done, req->zero);
 462
 463         /* read all data ? */
 464         if (is_done) {
 465                 int disable = 0;
 466
 467                 uep->handler->irq_mask(uep, disable);
 468                 usbhs_pipe_disable(pipe);
 469                 usbhsg_queue_pop(uep, ureq, 0);
 470         }
 471 }
 472
 473 static int usbhsg_try_run_receive_packet(struct usbhsg_uep *uep,
 474                                          struct usbhsg_request *ureq)
 475 {
 476         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 477         struct usb_request *req = &ureq->req;
 478         struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
 479
 480         /*
 481          *********  assume under spin lock  *********
 482          */
 483
 484         usbhs_pkt_update(pkt, pipe,
 485                          req->buf    + req->actual,
 486                          req->length - req->actual);
 487
 488         return usbhs_fifo_read(pkt);
 489 }
 490
 491 static int usbhsg_prepare_receive_packet(struct usbhsg_uep *uep,
 492                                          struct usbhsg_request *ureq)
 493 {
 494         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 495         int enable = 1;
 496         int ret;
 497
 498         /*
 499          *********  assume under spin lock  *********
 500          */
 501
 502         ret = usbhs_fifo_prepare_read(pipe);
 503         if (ret < 0)
 504                 return ret;
 505
 506         /*
 507          * data will be read in interrupt handler
 508          */
 509         uep->handler->irq_mask(uep, enable);
 510
 511         return ret;
 512 }
 513
 514 static struct usbhsg_pipe_handle usbhsg_handler_send_by_empty = {
 515         .prepare        = usbhsg_prepare_send_packet,
 516         .try_run        = usbhsg_try_run_send_packet,
 517         .irq_mask       = usbhsg_irq_empty_ctrl,
 518 };
 519
 520 static struct usbhsg_pipe_handle usbhsg_handler_send_by_ready = {
 521         .prepare        = usbhsg_prepare_send_packet,
 522         .try_run        = usbhsg_try_run_send_packet,
 523         .irq_mask       = usbhsg_irq_ready_ctrl,
 524 };
 525
 526 static struct usbhsg_pipe_handle usbhsg_handler_recv_by_ready = {
 527         .prepare        = usbhsg_prepare_receive_packet,
 528         .try_run        = usbhsg_try_run_receive_packet,
 529         .irq_mask       = usbhsg_irq_ready_ctrl,
 530 };
 531
 532 static struct usbhsg_pipe_handle usbhsg_handler_ctrl_stage_end = {
 533         .prepare        = usbhsg_try_run_ctrl_stage_end,
 534         .try_run        = usbhsg_try_run_ctrl_stage_end,
 535 };
 536
 537 /*
 538  * DCP pipe can NOT use "ready interrupt" for "send"
 539  * it should use "empty" interrupt.
 540  * see
 541  *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
 542  *
 543  * on the other hand, normal pipe can use "ready interrupt" for "send"
 544  * even though it is single/double buffer
 545  */
 546 #define usbhsg_handler_send_ctrl        usbhsg_handler_send_by_empty
 547 #define usbhsg_handler_recv_ctrl        usbhsg_handler_recv_by_ready
 548
 549 #define usbhsg_handler_send_packet      usbhsg_handler_send_by_ready
 550 #define usbhsg_handler_recv_packet      usbhsg_handler_recv_by_ready
 551
 552 /*
 553  *              USB_TYPE_STANDARD / clear feature functions
 554  */
 555 static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
 556                                                  struct usbhsg_uep *uep,
 557                                                  struct usb_ctrlrequest *ctrl)
 558 {
 559         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 560         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 561         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 562
 563         usbhs_dcp_control_transfer_done(pipe);
 564
 565         return 0;
 566 }
 567
 568 static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 569                                                    struct usbhsg_uep *uep,
 570                                                    struct usb_ctrlrequest *ctrl)
 571 {
 572         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 573         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 574
 575         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
 576                 usbhs_pipe_disable(pipe);
 577                 usbhs_pipe_clear_sequence(pipe);
 578                 usbhs_pipe_enable(pipe);
 579         }
 580
 581         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 582
 583         usbhsg_queue_prepare(uep);
 584
 585         return 0;
 586 }
 587
 588 struct usbhsg_recip_handle req_clear_feature = {
 589         .name           = "clear feature",
 590         .device         = usbhsg_recip_handler_std_control_done,
 591         .interface      = usbhsg_recip_handler_std_control_done,
 592         .endpoint       = usbhsg_recip_handler_std_clear_endpoint,
 593 };
 594
 595 /*
 596  *              USB_TYPE handler
 597  */
 598 static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 599                                    struct usbhsg_recip_handle *handler,
 600                                    struct usb_ctrlrequest *ctrl)
 601 {
 602         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 603         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 604         struct usbhsg_uep *uep;
 605         int recip = ctrl->bRequestType & USB_RECIP_MASK;
 606         int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 607         int ret;
 608         int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 609                     struct usb_ctrlrequest *ctrl);
 610         char *msg;
 611
 612         uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
 613         if (!usbhsg_uep_to_pipe(uep)) {
 614                 dev_err(dev, "wrong recip request\n");
 615                 return -EINVAL;
 616         }
 617
 618         switch (recip) {
 619         case USB_RECIP_DEVICE:
 620                 msg     = "DEVICE";
 621                 func    = handler->device;
 622                 break;
 623         case USB_RECIP_INTERFACE:
 624                 msg     = "INTERFACE";
 625                 func    = handler->interface;
 626                 break;
 627         case USB_RECIP_ENDPOINT:
 628                 msg     = "ENDPOINT";
 629                 func    = handler->endpoint;
 630                 break;
 631         default:
 632                 dev_warn(dev, "unsupported RECIP(%d)\n", recip);
 633                 func = NULL;
 634                 ret = -EINVAL;
 635         }
 636
 637         if (func) {
 638                 dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
 639                 ret = func(priv, uep, ctrl);
 640         }
 641
 642         return ret;
 643 }
 644
 645 /*
 646  *              irq functions
 647  *
 648  * it will be called from usbhs_interrupt
 649  */
 650 static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
 651                                 struct usbhs_irq_state *irq_state)
 652 {
 653         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 654         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 655
 656         gpriv->gadget.speed = usbhs_status_get_usb_speed(irq_state);
 657
 658         dev_dbg(dev, "state = %x : speed : %d\n",
 659                 usbhs_status_get_device_state(irq_state),
 660                 gpriv->gadget.speed);
 661
 662         return 0;
 663 }
 664
 665 static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 666                                  struct usbhs_irq_state *irq_state)
 667 {
 668         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 669         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 670         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 671         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 672         struct usb_ctrlrequest ctrl;
 673         struct usbhsg_recip_handle *recip_handler = NULL;
 674         int stage = usbhs_status_get_ctrl_stage(irq_state);
 675         int ret = 0;
 676
 677         dev_dbg(dev, "stage = %d\n", stage);
 678
 679         /*
 680          * see Manual
 681          *
 682          *  "Operation"
 683          *  - "Interrupt Function"
 684          *    - "Control Transfer Stage Transition Interrupt"
 685          *      - Fig. "Control Transfer Stage Transitions"
 686          */
 687
 688         switch (stage) {
 689         case READ_DATA_STAGE:
 690                 dcp->handler = &usbhsg_handler_send_ctrl;
 691                 break;
 692         case WRITE_DATA_STAGE:
 693                 dcp->handler = &usbhsg_handler_recv_ctrl;
 694                 break;
 695         case NODATA_STATUS_STAGE:
 696                 dcp->handler = &usbhsg_handler_ctrl_stage_end;
 697                 break;
 698         default:
 699                 return ret;
 700         }
 701
 702         /*
 703          * get usb request
 704          */
 705         usbhs_usbreq_get_val(priv, &ctrl);
 706
 707         switch (ctrl.bRequestType & USB_TYPE_MASK) {
 708         case USB_TYPE_STANDARD:
 709                 switch (ctrl.bRequest) {
 710                 case USB_REQ_CLEAR_FEATURE:
 711                         recip_handler = &req_clear_feature;
 712                         break;
 713                 }
 714         }
 715
 716         /*
 717          * setup stage / run recip
 718          */
 719         if (recip_handler)
 720                 ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
 721         else
 722                 ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
 723
 724         if (ret < 0)
 725                 usbhs_pipe_stall(pipe);
 726
 727         return ret;
 728 }
 729
 730 static int usbhsg_irq_empty(struct usbhs_priv *priv,
 731                             struct usbhs_irq_state *irq_state)
 732 {
 733         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 734         struct usbhsg_uep *uep;
 735         struct usbhs_pipe *pipe;
 736         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 737         int i, ret;
 738
 739         if (!irq_state->bempsts) {
 740                 dev_err(dev, "debug %s !!\n", __func__);
 741                 return -EIO;
 742         }
 743
 744         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
 745
 746         /*
 747          * search interrupted "pipe"
 748          * not "uep".
 749          */
 750         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
 751                 if (!(irq_state->bempsts & (1 << i)))
 752                         continue;
 753
 754                 uep     = usbhsg_pipe_to_uep(pipe);
 755                 ret     = usbhsg_queue_handle(uep);
 756                 if (ret < 0)
 757                         dev_err(dev, "send error %d : %d\n", i, ret);
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int usbhsg_irq_ready(struct usbhs_priv *priv,
 764                             struct usbhs_irq_state *irq_state)
 765 {
 766         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 767         struct usbhsg_uep *uep;
 768         struct usbhs_pipe *pipe;
 769         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 770         int i, ret;
 771
 772         if (!irq_state->brdysts) {
 773                 dev_err(dev, "debug %s !!\n", __func__);
 774                 return -EIO;
 775         }
 776
 777         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
 778
 779         /*
 780          * search interrupted "pipe"
 781          * not "uep".
 782          */
 783         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
 784                 if (!(irq_state->brdysts & (1 << i)))
 785                         continue;
 786
 787                 uep     = usbhsg_pipe_to_uep(pipe);
 788                 ret     = usbhsg_queue_handle(uep);
 789                 if (ret < 0)
 790                         dev_err(dev, "receive error %d : %d\n", i, ret);
 791         }
 792
 793         return 0;
 794 }
 795
 796 /*
 797  *
 798  *              usb_dcp_ops
 799  *
 800  */
 801 static int usbhsg_dcp_enable(struct usbhsg_uep *uep)
 802 {
 803         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 804         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 805         struct usbhs_pipe *pipe;
 806
 807         /*
 808          *********  assume under spin lock  *********
 809          */
 810
 811         pipe = usbhs_dcp_malloc(priv);
 812         if (!pipe)
 813                 return -EIO;
 814
 815         uep->pipe               = pipe;
 816         uep->pipe->mod_private  = uep;
 817         INIT_LIST_HEAD(&uep->list);
 818
 819         return 0;
 820 }
 821
 822 #define usbhsg_dcp_disable usbhsg_pipe_disable
 823 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 824 {
 825         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 826         struct usbhsg_request *ureq;
 827         int disable = 0;
 828
 829         /*
 830          *********  assume under spin lock  *********
 831          */
 832
 833         usbhs_pipe_disable(pipe);
 834
 835         /*
 836          * disable pipe irq
 837          */
 838         usbhsg_irq_empty_ctrl(uep, disable);
 839         usbhsg_irq_ready_ctrl(uep, disable);
 840
 841         while (1) {
 842                 ureq = usbhsg_queue_get(uep);
 843                 if (!ureq)
 844                         break;
 845
 846                 usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 847         }
 848
 849         return 0;
 850 }
 851
 852 static void usbhsg_uep_init(struct usbhsg_gpriv *gpriv)
 853 {
 854         int i;
 855         struct usbhsg_uep *uep;
 856
 857         usbhsg_for_each_uep_with_dcp(uep, gpriv, i)
 858                 uep->pipe = NULL;
 859 }
 860
 861 /*
 862  *
 863  *              usb_ep_ops
 864  *
 865  */
 866 static int usbhsg_ep_enable(struct usb_ep *ep,
 867                          const struct usb_endpoint_descriptor *desc)
 868 {
 869         struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
 870         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 871         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 872         struct usbhs_pipe *pipe;
 873         spinlock_t *lock;
 874         unsigned long flags;
 875         int ret = -EIO;
 876
 877         /*
 878          * if it already have pipe,
 879          * nothing to do
 880          */
 881         if (uep->pipe)
 882                 return 0;
 883
 884         /********************  spin lock ********************/
 885         lock = usbhsg_trylock(gpriv, &flags);
 886
 887         pipe = usbhs_pipe_malloc(priv, desc);
 888         if (pipe) {
 889                 uep->pipe               = pipe;
 890                 pipe->mod_private       = uep;
 891                 INIT_LIST_HEAD(&uep->list);
 892
 893                 if (usb_endpoint_dir_in(desc))
 894                         uep->handler = &usbhsg_handler_send_packet;
 895                 else
 896                         uep->handler = &usbhsg_handler_recv_packet;
 897
 898                 ret = 0;
 899         }
 900
 901         usbhsg_unlock(lock, &flags);
 902         /********************  spin unlock ******************/
 903
 904         return ret;
 905 }
 906
 907 static int usbhsg_ep_disable(struct usb_ep *ep)
 908 {
 909         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 910         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 911         spinlock_t *lock;
 912         unsigned long flags;
 913         int ret;
 914
 915         /********************  spin lock ********************/
 916         lock = usbhsg_trylock(gpriv, &flags);
 917
 918         ret = usbhsg_pipe_disable(uep);
 919
 920         usbhsg_unlock(lock, &flags);
 921         /********************  spin unlock ******************/
 922
 923         return ret;
 924 }
 925
 926 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
 927                                                    gfp_t gfp_flags)
 928 {
 929         struct usbhsg_request *ureq;
 930
 931         ureq = kzalloc(sizeof *ureq, gfp_flags);
 932         if (!ureq)
 933                 return NULL;
 934
 935         INIT_LIST_HEAD(&ureq->node);
 936         return &ureq->req;
 937 }
 938
 939 static void usbhsg_ep_free_request(struct usb_ep *ep,
 940                                    struct usb_request *req)
 941 {
 942         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 943
 944         WARN_ON(!list_empty(&ureq->node));
 945         kfree(ureq);
 946 }
 947
 948 static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
 949                           gfp_t gfp_flags)
 950 {
 951         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 952         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 953         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 954         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 955         spinlock_t *lock;
 956         unsigned long flags;
 957         int ret = 0;
 958
 959         /*
 960          * CAUTION [*endpoint queue*]
 961          *
 962          * This function will be called from usb_request :: complete
 963          * or usb driver timing.
 964          * If this function is called from usb_request :: complete,
 965          * it is already under spinlock on this driver.
 966          * but it is called frm usb driver, this function should call spinlock.
 967          *
 968          * This function is using usbshg_trylock to solve this issue.
 969          * if "is_locked" is 1, this mean this function lock it.
 970          * but if it is 0, this mean it is already under spin lock.
 971          * see also
 972          *   CAUTION [*queue handler*]
 973          *   CAUTION [*request complete*]
 974          */
 975
 976         /********************  spin lock ********************/
 977         lock = usbhsg_trylock(gpriv, &flags);
 978
 979         /* param check */
 980         if (usbhsg_is_not_connected(gpriv)      ||
 981             unlikely(!gpriv->driver)            ||
 982             unlikely(!pipe))
 983                 ret = -ESHUTDOWN;
 984         else
 985                 usbhsg_queue_push(uep, ureq);
 986
 987         usbhsg_unlock(lock, &flags);
 988         /********************  spin unlock ******************/
 989
 990         usbhsg_queue_prepare(uep);
 991
 992         return ret;
 993 }
 994
 995 static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 996 {
 997         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 998         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 999         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
1000         spinlock_t *lock;
1001         unsigned long flags;
1002
1003         /*
1004          * see
1005          *   CAUTION [*queue handler*]
1006          *   CAUTION [*endpoint queue*]
1007          *   CAUTION [*request complete*]
1008          */
1009
1010         /********************  spin lock ********************/
1011         lock = usbhsg_trylock(gpriv, &flags);
1012
1013         usbhsg_queue_pop(uep, ureq, -ECONNRESET);
1014
1015         usbhsg_unlock(lock, &flags);
1016         /********************  spin unlock ******************/
1017
1018         return 0;
1019 }
1020
1021 static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
1022 {
1023         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
1024         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
1025         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
1026         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
1027         spinlock_t *lock;
1028         unsigned long flags;
1029         int ret = -EAGAIN;
1030
1031         /*
1032          * see
1033          *   CAUTION [*queue handler*]
1034          *   CAUTION [*endpoint queue*]
1035          *   CAUTION [*request complete*]
1036          */
1037
1038         /********************  spin lock ********************/
1039         lock = usbhsg_trylock(gpriv, &flags);
1040         if (!usbhsg_queue_get(uep)) {
1041
1042                 dev_dbg(dev, "set halt %d (pipe %d)\n",
1043                         halt, usbhs_pipe_number(pipe));
1044
1045                 if (halt)
1046                         usbhs_pipe_stall(pipe);
1047                 else
1048                         usbhs_pipe_disable(pipe);
1049
1050                 if (halt && wedge)
1051                         usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
1052                 else
1053                         usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
1054
1055                 ret = 0;
1056         }
1057
1058         usbhsg_unlock(lock, &flags);
1059         /********************  spin unlock ******************/
1060
1061         return ret;
1062 }
1063
1064 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
1065 {
1066         return __usbhsg_ep_set_halt_wedge(ep, value, 0);
1067 }
1068
1069 static int usbhsg_ep_set_wedge(struct usb_ep *ep)
1070 {
1071         return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
1072 }
1073
1074 static struct usb_ep_ops usbhsg_ep_ops = {
1075         .enable         = usbhsg_ep_enable,
1076         .disable        = usbhsg_ep_disable,
1077
1078         .alloc_request  = usbhsg_ep_alloc_request,
1079         .free_request   = usbhsg_ep_free_request,
1080
1081         .queue          = usbhsg_ep_queue,
1082         .dequeue        = usbhsg_ep_dequeue,
1083
1084         .set_halt       = usbhsg_ep_set_halt,
1085         .set_wedge      = usbhsg_ep_set_wedge,
1086 };
1087
1088 /*
1089  *              usb module start/end
1090  */
1091 static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
1092 {
1093         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1094         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
1095         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1096         struct device *dev = usbhs_priv_to_dev(priv);
1097         spinlock_t *lock;
1098         unsigned long flags;
1099
1100         /********************  spin lock ********************/
1101         lock = usbhsg_trylock(gpriv, &flags);
1102
1103         /*
1104          * enable interrupt and systems if ready
1105          */
1106         usbhsg_status_set(gpriv, status);
1107         if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
1108               usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
1109                 goto usbhsg_try_start_unlock;
1110
1111         dev_dbg(dev, "start gadget\n");
1112
1113         /*
1114          * pipe initialize and enable DCP
1115          */
1116         usbhs_pipe_init(priv,
1117                         usbhsg_try_run_send_packet_bh,
1118                         usbhsg_try_run_receive_packet_bh);
1119         usbhsg_uep_init(gpriv);
1120         usbhsg_dcp_enable(dcp);
1121
1122         /*
1123          * system config enble
1124          * - HI speed
1125          * - function
1126          * - usb module
1127          */
1128         usbhs_sys_hispeed_ctrl(priv, 1);
1129         usbhs_sys_function_ctrl(priv, 1);
1130         usbhs_sys_usb_ctrl(priv, 1);
1131
1132         /*
1133          * enable irq callback
1134          */
1135         mod->irq_dev_state      = usbhsg_irq_dev_state;
1136         mod->irq_ctrl_stage     = usbhsg_irq_ctrl_stage;
1137         mod->irq_empty          = usbhsg_irq_empty;
1138         mod->irq_ready          = usbhsg_irq_ready;
1139         mod->irq_bempsts        = 0;
1140         mod->irq_brdysts        = 0;
1141         usbhs_irq_callback_update(priv, mod);
1142
1143 usbhsg_try_start_unlock:
1144         usbhsg_unlock(lock, &flags);
1145         /********************  spin unlock ********************/
1146
1147         return 0;
1148 }
1149
1150 static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
1151 {
1152         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1153         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1154         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
1155         struct device *dev = usbhs_priv_to_dev(priv);
1156         spinlock_t *lock;
1157         unsigned long flags;
1158
1159         /********************  spin lock ********************/
1160         lock = usbhsg_trylock(gpriv, &flags);
1161
1162         /*
1163          * disable interrupt and systems if 1st try
1164          */
1165         usbhsg_status_clr(gpriv, status);
1166         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
1167             !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
1168                 goto usbhsg_try_stop_unlock;
1169
1170         /* disable all irq */
1171         mod->irq_dev_state      = NULL;
1172         mod->irq_ctrl_stage     = NULL;
1173         mod->irq_empty          = NULL;
1174         mod->irq_ready          = NULL;
1175         mod->irq_bempsts        = 0;
1176         mod->irq_brdysts        = 0;
1177         usbhs_irq_callback_update(priv, mod);
1178
1179         usbhsg_dcp_disable(dcp);
1180
1181         gpriv->gadget.speed = USB_SPEED_UNKNOWN;
1182
1183         /* disable sys */
1184         usbhs_sys_hispeed_ctrl(priv, 0);
1185         usbhs_sys_function_ctrl(priv, 0);
1186         usbhs_sys_usb_ctrl(priv, 0);
1187
1188         usbhsg_unlock(lock, &flags);
1189         /********************  spin unlock ********************/
1190
1191         if (gpriv->driver &&
1192             gpriv->driver->disconnect)
1193                 gpriv->driver->disconnect(&gpriv->gadget);
1194
1195         dev_dbg(dev, "stop gadget\n");
1196
1197         return 0;
1198
1199 usbhsg_try_stop_unlock:
1200         usbhsg_unlock(lock, &flags);
1201
1202         return 0;
1203 }
1204
1205 /*
1206  *
1207  *              linux usb function
1208  *
1209  */
1210 struct usbhsg_gpriv *the_controller;
1211 int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
1212                             int (*bind)(struct usb_gadget *))
1213 {
1214         struct usbhsg_gpriv *gpriv = the_controller;
1215         struct usbhs_priv *priv;
1216         struct device *dev;
1217         int ret;
1218
1219         if (!bind               ||
1220             !driver             ||
1221             !driver->setup      ||
1222             driver->speed != USB_SPEED_HIGH)
1223                 return -EINVAL;
1224         if (!gpriv)
1225                 return -ENODEV;
1226         if (gpriv->driver)
1227                 return -EBUSY;
1228
1229         dev  = usbhsg_gpriv_to_dev(gpriv);
1230         priv = usbhsg_gpriv_to_priv(gpriv);
1231
1232         /* first hook up the driver ... */
1233         gpriv->driver = driver;
1234         gpriv->gadget.dev.driver = &driver->driver;
1235
1236         ret = device_add(&gpriv->gadget.dev);
1237         if (ret) {
1238                 dev_err(dev, "device_add error %d\n", ret);
1239                 goto add_fail;
1240         }
1241
1242         ret = bind(&gpriv->gadget);
1243         if (ret) {
1244                 dev_err(dev, "bind to driver %s error %d\n",
1245                         driver->driver.name, ret);
1246                 goto bind_fail;
1247         }
1248
1249         dev_dbg(dev, "bind %s\n", driver->driver.name);
1250
1251         return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
1252
1253 bind_fail:
1254         device_del(&gpriv->gadget.dev);
1255 add_fail:
1256         gpriv->driver = NULL;
1257         gpriv->gadget.dev.driver = NULL;
1258
1259         return ret;
1260 }
1261 EXPORT_SYMBOL(usb_gadget_probe_driver);
1262
1263 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1264 {
1265         struct usbhsg_gpriv *gpriv = the_controller;
1266         struct usbhs_priv *priv;
1267         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
1268
1269         if (!gpriv)
1270                 return -ENODEV;
1271
1272         if (!driver             ||
1273             !driver->unbind     ||
1274             driver != gpriv->driver)
1275                 return -EINVAL;
1276
1277         dev  = usbhsg_gpriv_to_dev(gpriv);
1278         priv = usbhsg_gpriv_to_priv(gpriv);
1279
1280         usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
1281         device_del(&gpriv->gadget.dev);
1282         gpriv->driver = NULL;
1283
1284         if (driver->disconnect)
1285                 driver->disconnect(&gpriv->gadget);
1286
1287         driver->unbind(&gpriv->gadget);
1288         dev_dbg(dev, "unbind %s\n", driver->driver.name);
1289
1290         return 0;
1291 }
1292 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1293
1294 /*
1295  *              usb gadget ops
1296  */
1297 static int usbhsg_get_frame(struct usb_gadget *gadget)
1298 {
1299         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
1300         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
1301
1302         return usbhs_frame_get_num(priv);
1303 }
1304
1305 static struct usb_gadget_ops usbhsg_gadget_ops = {
1306         .get_frame              = usbhsg_get_frame,
1307 };
1308
1309 static int usbhsg_start(struct usbhs_priv *priv)
1310 {
1311         return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
1312 }
1313
1314 static int usbhsg_stop(struct usbhs_priv *priv)
1315 {
1316         return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
1317 }
1318
1319 int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
1320 {
1321         struct usbhsg_gpriv *gpriv;
1322         struct usbhsg_uep *uep;
1323         struct device *dev = usbhs_priv_to_dev(priv);
1324         int pipe_size = usbhs_get_dparam(priv, pipe_size);
1325         int i;
1326
1327         gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
1328         if (!gpriv) {
1329                 dev_err(dev, "Could not allocate gadget priv\n");
1330                 return -ENOMEM;
1331         }
1332
1333         uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
1334         if (!uep) {
1335                 dev_err(dev, "Could not allocate ep\n");
1336                 goto usbhs_mod_gadget_probe_err_gpriv;
1337         }
1338
1339         /*
1340          * CAUTION
1341          *
1342          * There is no guarantee that it is possible to access usb module here.
1343          * Don't accesses to it.
1344          * The accesse will be enable after "usbhsg_start"
1345          */
1346
1347         /*
1348          * register itself
1349          */
1350         usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
1351
1352         /* init gpriv */
1353         gpriv->mod.name         = "gadget";
1354         gpriv->mod.start        = usbhsg_start;
1355         gpriv->mod.stop         = usbhsg_stop;
1356         gpriv->uep              = uep;
1357         gpriv->uep_size         = pipe_size;
1358         usbhsg_status_init(gpriv);
1359
1360         /*
1361          * init gadget
1362          */
1363         device_initialize(&gpriv->gadget.dev);
1364         dev_set_name(&gpriv->gadget.dev, "gadget");
1365         gpriv->gadget.dev.parent        = dev;
1366         gpriv->gadget.name              = "renesas_usbhs_udc";
1367         gpriv->gadget.ops               = &usbhsg_gadget_ops;
1368         gpriv->gadget.is_dualspeed      = 1;
1369
1370         INIT_LIST_HEAD(&gpriv->gadget.ep_list);
1371
1372         /*
1373          * init usb_ep
1374          */
1375         usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
1376                 uep->gpriv      = gpriv;
1377                 snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
1378
1379                 uep->ep.name            = uep->ep_name;
1380                 uep->ep.ops             = &usbhsg_ep_ops;
1381                 INIT_LIST_HEAD(&uep->ep.ep_list);
1382                 INIT_LIST_HEAD(&uep->list);
1383
1384                 /* init DCP */
1385                 if (usbhsg_is_dcp(uep)) {
1386                         gpriv->gadget.ep0 = &uep->ep;
1387                         uep->ep.maxpacket = 64;
1388                 }
1389                 /* init normal pipe */
1390                 else {
1391                         uep->ep.maxpacket = 512;
1392                         list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
1393                 }
1394         }
1395
1396         the_controller = gpriv;
1397
1398         dev_info(dev, "gadget probed\n");
1399
1400         return 0;
1401
1402 usbhs_mod_gadget_probe_err_gpriv:
1403         kfree(gpriv);
1404
1405         return -ENOMEM;
1406 }
1407
1408 void __devexit usbhs_mod_gadget_remove(struct usbhs_priv *priv)
1409 {
1410         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1411
1412         kfree(gpriv);
1413 }