drivers/usb/gadget/udc/udc-core.c

   1 /**
   2  * udc.c - Core UDC Framework
   3  *
   4  * Copyright (C) 2010 Texas Instruments
   5  * Author: Felipe Balbi <balbi@ti.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2  of
   9  * the License as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/device.h>
  23 #include <linux/list.h>
  24 #include <linux/err.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/workqueue.h>
  27
  28 #include <linux/usb/ch9.h>
  29 #include <linux/usb/gadget.h>
  30 #include <linux/usb.h>
  31
  32 /**
  33  * struct usb_udc - describes one usb device controller
  34  * @driver - the gadget driver pointer. For use by the class code
  35  * @dev - the child device to the actual controller
  36  * @gadget - the gadget. For use by the class code
  37  * @list - for use by the udc class driver
  38  * @vbus - for udcs who care about vbus status, this value is real vbus status;
  39  * for udcs who do not care about vbus status, this value is always true
  40  *
  41  * This represents the internal data structure which is used by the UDC-class
  42  * to hold information about udc driver and gadget together.
  43  */
  44 struct usb_udc {
  45         struct usb_gadget_driver        *driver;
  46         struct usb_gadget               *gadget;
  47         struct device                   dev;
  48         struct list_head                list;
  49         bool                            vbus;
  50 };
  51
  52 static struct class *udc_class;
  53 static LIST_HEAD(udc_list);
  54 static DEFINE_MUTEX(udc_lock);
  55
  56 /* ------------------------------------------------------------------------- */
  57
  58 #ifdef  CONFIG_HAS_DMA
  59
  60 int usb_gadget_map_request(struct usb_gadget *gadget,
  61                 struct usb_request *req, int is_in)
  62 {
  63         struct device *dev = gadget->dev.parent;
  64
  65         if (req->length == 0)
  66                 return 0;
  67
  68         if (req->num_sgs) {
  69                 int     mapped;
  70
  71                 mapped = dma_map_sg(dev, req->sg, req->num_sgs,
  72                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  73                 if (mapped == 0) {
  74                         dev_err(&gadget->dev, "failed to map SGs\n");
  75                         return -EFAULT;
  76                 }
  77
  78                 req->num_mapped_sgs = mapped;
  79         } else {
  80                 req->dma = dma_map_single(dev, req->buf, req->length,
  81                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  82
  83                 if (dma_mapping_error(dev, req->dma)) {
  84                         dev_err(dev, "failed to map buffer\n");
  85                         return -EFAULT;
  86                 }
  87         }
  88
  89         return 0;
  90 }
  91 EXPORT_SYMBOL_GPL(usb_gadget_map_request);
  92
  93 void usb_gadget_unmap_request(struct usb_gadget *gadget,
  94                 struct usb_request *req, int is_in)
  95 {
  96         if (req->length == 0)
  97                 return;
  98
  99         if (req->num_mapped_sgs) {
 100                 dma_unmap_sg(gadget->dev.parent, req->sg, req->num_mapped_sgs,
 101                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 102
 103                 req->num_mapped_sgs = 0;
 104         } else {
 105                 dma_unmap_single(gadget->dev.parent, req->dma, req->length,
 106                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 107         }
 108 }
 109 EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 110
 111 #endif  /* CONFIG_HAS_DMA */
 112
 113 /* ------------------------------------------------------------------------- */
 114
 115 /**
 116  * usb_gadget_giveback_request - give the request back to the gadget layer
 117  * Context: in_interrupt()
 118  *
 119  * This is called by device controller drivers in order to return the
 120  * completed request back to the gadget layer.
 121  */
 122 void usb_gadget_giveback_request(struct usb_ep *ep,
 123                 struct usb_request *req)
 124 {
 125         if (likely(req->status == 0))
 126                 usb_led_activity(USB_LED_EVENT_GADGET);
 127
 128         req->complete(ep, req);
 129 }
 130 EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
 131
 132 /* ------------------------------------------------------------------------- */
 133
 134 /**
 135  * gadget_find_ep_by_name - returns ep whose name is the same as sting passed
 136  *      in second parameter or NULL if searched endpoint not found
 137  * @g: controller to check for quirk
 138  * @name: name of searched endpoint
 139  */
 140 struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name)
 141 {
 142         struct usb_ep *ep;
 143
 144         gadget_for_each_ep(ep, g) {
 145                 if (!strcmp(ep->name, name))
 146                         return ep;
 147         }
 148
 149         return NULL;
 150 }
 151 EXPORT_SYMBOL_GPL(gadget_find_ep_by_name);
 152
 153 /* ------------------------------------------------------------------------- */
 154
 155 int usb_gadget_ep_match_desc(struct usb_gadget *gadget,
 156                 struct usb_ep *ep, struct usb_endpoint_descriptor *desc,
 157                 struct usb_ss_ep_comp_descriptor *ep_comp)
 158 {
 159         u8              type;
 160         u16             max;
 161         int             num_req_streams = 0;
 162
 163         /* endpoint already claimed? */
 164         if (ep->claimed)
 165                 return 0;
 166
 167         type = usb_endpoint_type(desc);
 168         max = 0x7ff & usb_endpoint_maxp(desc);
 169
 170         if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in)
 171                 return 0;
 172         if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out)
 173                 return 0;
 174
 175         if (max > ep->maxpacket_limit)
 176                 return 0;
 177
 178         /* "high bandwidth" works only at high speed */
 179         if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp(desc) & (3<<11))
 180                 return 0;
 181
 182         switch (type) {
 183         case USB_ENDPOINT_XFER_CONTROL:
 184                 /* only support ep0 for portable CONTROL traffic */
 185                 return 0;
 186         case USB_ENDPOINT_XFER_ISOC:
 187                 if (!ep->caps.type_iso)
 188                         return 0;
 189                 /* ISO:  limit 1023 bytes full speed, 1024 high/super speed */
 190                 if (!gadget_is_dualspeed(gadget) && max > 1023)
 191                         return 0;
 192                 break;
 193         case USB_ENDPOINT_XFER_BULK:
 194                 if (!ep->caps.type_bulk)
 195                         return 0;
 196                 if (ep_comp && gadget_is_superspeed(gadget)) {
 197                         /* Get the number of required streams from the
 198                          * EP companion descriptor and see if the EP
 199                          * matches it
 200                          */
 201                         num_req_streams = ep_comp->bmAttributes & 0x1f;
 202                         if (num_req_streams > ep->max_streams)
 203                                 return 0;
 204                 }
 205                 break;
 206         case USB_ENDPOINT_XFER_INT:
 207                 /* Bulk endpoints handle interrupt transfers,
 208                  * except the toggle-quirky iso-synch kind
 209                  */
 210                 if (!ep->caps.type_int && !ep->caps.type_bulk)
 211                         return 0;
 212                 /* INT:  limit 64 bytes full speed, 1024 high/super speed */
 213                 if (!gadget_is_dualspeed(gadget) && max > 64)
 214                         return 0;
 215                 break;
 216         }
 217
 218         return 1;
 219 }
 220 EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc);
 221
 222 /* ------------------------------------------------------------------------- */
 223
 224 static void usb_gadget_state_work(struct work_struct *work)
 225 {
 226         struct usb_gadget *gadget = work_to_gadget(work);
 227         struct usb_udc *udc = gadget->udc;
 228
 229         if (udc)
 230                 sysfs_notify(&udc->dev.kobj, NULL, "state");
 231 }
 232
 233 void usb_gadget_set_state(struct usb_gadget *gadget,
 234                 enum usb_device_state state)
 235 {
 236         gadget->state = state;
 237         schedule_work(&gadget->work);
 238 }
 239 EXPORT_SYMBOL_GPL(usb_gadget_set_state);
 240
 241 /* ------------------------------------------------------------------------- */
 242
 243 static void usb_udc_connect_control(struct usb_udc *udc)
 244 {
 245         if (udc->vbus)
 246                 usb_gadget_connect(udc->gadget);
 247         else
 248                 usb_gadget_disconnect(udc->gadget);
 249 }
 250
 251 /**
 252  * usb_udc_vbus_handler - updates the udc core vbus status, and try to
 253  * connect or disconnect gadget
 254  * @gadget: The gadget which vbus change occurs
 255  * @status: The vbus status
 256  *
 257  * The udc driver calls it when it wants to connect or disconnect gadget
 258  * according to vbus status.
 259  */
 260 void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status)
 261 {
 262         struct usb_udc *udc = gadget->udc;
 263
 264         if (udc) {
 265                 udc->vbus = status;
 266                 usb_udc_connect_control(udc);
 267         }
 268 }
 269 EXPORT_SYMBOL_GPL(usb_udc_vbus_handler);
 270
 271 /**
 272  * usb_gadget_udc_reset - notifies the udc core that bus reset occurs
 273  * @gadget: The gadget which bus reset occurs
 274  * @driver: The gadget driver we want to notify
 275  *
 276  * If the udc driver has bus reset handler, it needs to call this when the bus
 277  * reset occurs, it notifies the gadget driver that the bus reset occurs as
 278  * well as updates gadget state.
 279  */
 280 void usb_gadget_udc_reset(struct usb_gadget *gadget,
 281                 struct usb_gadget_driver *driver)
 282 {
 283         driver->reset(gadget);
 284         usb_gadget_set_state(gadget, USB_STATE_DEFAULT);
 285 }
 286 EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
 287
 288 /**
 289  * usb_gadget_udc_start - tells usb device controller to start up
 290  * @udc: The UDC to be started
 291  *
 292  * This call is issued by the UDC Class driver when it's about
 293  * to register a gadget driver to the device controller, before
 294  * calling gadget driver's bind() method.
 295  *
 296  * It allows the controller to be powered off until strictly
 297  * necessary to have it powered on.
 298  *
 299  * Returns zero on success, else negative errno.
 300  */
 301 static inline int usb_gadget_udc_start(struct usb_udc *udc)
 302 {
 303         return udc->gadget->ops->udc_start(udc->gadget, udc->driver);
 304 }
 305
 306 /**
 307  * usb_gadget_udc_stop - tells usb device controller we don't need it anymore
 308  * @gadget: The device we want to stop activity
 309  * @driver: The driver to unbind from @gadget
 310  *
 311  * This call is issued by the UDC Class driver after calling
 312  * gadget driver's unbind() method.
 313  *
 314  * The details are implementation specific, but it can go as
 315  * far as powering off UDC completely and disable its data
 316  * line pullups.
 317  */
 318 static inline void usb_gadget_udc_stop(struct usb_udc *udc)
 319 {
 320         udc->gadget->ops->udc_stop(udc->gadget);
 321 }
 322
 323 /**
 324  * usb_udc_release - release the usb_udc struct
 325  * @dev: the dev member within usb_udc
 326  *
 327  * This is called by driver's core in order to free memory once the last
 328  * reference is released.
 329  */
 330 static void usb_udc_release(struct device *dev)
 331 {
 332         struct usb_udc *udc;
 333
 334         udc = container_of(dev, struct usb_udc, dev);
 335         dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
 336         kfree(udc);
 337 }
 338
 339 static const struct attribute_group *usb_udc_attr_groups[];
 340
 341 static void usb_udc_nop_release(struct device *dev)
 342 {
 343         dev_vdbg(dev, "%s\n", __func__);
 344 }
 345
 346 /**
 347  * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
 348  * @parent: the parent device to this udc. Usually the controller driver's
 349  * device.
 350  * @gadget: the gadget to be added to the list.
 351  * @release: a gadget release function.
 352  *
 353  * Returns zero on success, negative errno otherwise.
 354  */
 355 int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
 356                 void (*release)(struct device *dev))
 357 {
 358         struct usb_udc          *udc;
 359         int                     ret = -ENOMEM;
 360
 361         udc = kzalloc(sizeof(*udc), GFP_KERNEL);
 362         if (!udc)
 363                 goto err1;
 364
 365         dev_set_name(&gadget->dev, "gadget");
 366         INIT_WORK(&gadget->work, usb_gadget_state_work);
 367         gadget->dev.parent = parent;
 368
 369 #ifdef  CONFIG_HAS_DMA
 370         dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask);
 371         gadget->dev.dma_parms = parent->dma_parms;
 372         gadget->dev.dma_mask = parent->dma_mask;
 373 #endif
 374
 375         if (release)
 376                 gadget->dev.release = release;
 377         else
 378                 gadget->dev.release = usb_udc_nop_release;
 379
 380         ret = device_register(&gadget->dev);
 381         if (ret)
 382                 goto err2;
 383
 384         device_initialize(&udc->dev);
 385         udc->dev.release = usb_udc_release;
 386         udc->dev.class = udc_class;
 387         udc->dev.groups = usb_udc_attr_groups;
 388         udc->dev.parent = parent;
 389         ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
 390         if (ret)
 391                 goto err3;
 392
 393         udc->gadget = gadget;
 394         gadget->udc = udc;
 395
 396         mutex_lock(&udc_lock);
 397         list_add_tail(&udc->list, &udc_list);
 398
 399         ret = device_add(&udc->dev);
 400         if (ret)
 401                 goto err4;
 402
 403         usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
 404         udc->vbus = true;
 405
 406         mutex_unlock(&udc_lock);
 407
 408         return 0;
 409
 410 err4:
 411         list_del(&udc->list);
 412         mutex_unlock(&udc_lock);
 413
 414 err3:
 415         put_device(&udc->dev);
 416         device_del(&gadget->dev);
 417
 418 err2:
 419         put_device(&gadget->dev);
 420         kfree(udc);
 421
 422 err1:
 423         return ret;
 424 }
 425 EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
 426
 427 /**
 428  * usb_add_gadget_udc - adds a new gadget to the udc class driver list
 429  * @parent: the parent device to this udc. Usually the controller
 430  * driver's device.
 431  * @gadget: the gadget to be added to the list
 432  *
 433  * Returns zero on success, negative errno otherwise.
 434  */
 435 int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
 436 {
 437         return usb_add_gadget_udc_release(parent, gadget, NULL);
 438 }
 439 EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
 440
 441 static void usb_gadget_remove_driver(struct usb_udc *udc)
 442 {
 443         dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
 444                         udc->driver->function);
 445
 446         kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 447
 448         usb_gadget_disconnect(udc->gadget);
 449         udc->driver->disconnect(udc->gadget);
 450         udc->driver->unbind(udc->gadget);
 451         usb_gadget_udc_stop(udc);
 452
 453         udc->driver = NULL;
 454         udc->dev.driver = NULL;
 455         udc->gadget->dev.driver = NULL;
 456 }
 457
 458 /**
 459  * usb_del_gadget_udc - deletes @udc from udc_list
 460  * @gadget: the gadget to be removed.
 461  *
 462  * This, will call usb_gadget_unregister_driver() if
 463  * the @udc is still busy.
 464  */
 465 void usb_del_gadget_udc(struct usb_gadget *gadget)
 466 {
 467         struct usb_udc *udc = gadget->udc;
 468
 469         if (!udc)
 470                 return;
 471
 472         dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
 473
 474         mutex_lock(&udc_lock);
 475         list_del(&udc->list);
 476         mutex_unlock(&udc_lock);
 477
 478         if (udc->driver)
 479                 usb_gadget_remove_driver(udc);
 480
 481         kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
 482         flush_work(&gadget->work);
 483         device_unregister(&udc->dev);
 484         device_unregister(&gadget->dev);
 485 }
 486 EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
 487
 488 /* ------------------------------------------------------------------------- */
 489
 490 static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
 491 {
 492         int ret;
 493
 494         dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
 495                         driver->function);
 496
 497         udc->driver = driver;
 498         udc->dev.driver = &driver->driver;
 499         udc->gadget->dev.driver = &driver->driver;
 500
 501         ret = driver->bind(udc->gadget, driver);
 502         if (ret)
 503                 goto err1;
 504         ret = usb_gadget_udc_start(udc);
 505         if (ret) {
 506                 driver->unbind(udc->gadget);
 507                 goto err1;
 508         }
 509         usb_udc_connect_control(udc);
 510
 511         kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 512         return 0;
 513 err1:
 514         if (ret != -EISNAM)
 515                 dev_err(&udc->dev, "failed to start %s: %d\n",
 516                         udc->driver->function, ret);
 517         udc->driver = NULL;
 518         udc->dev.driver = NULL;
 519         udc->gadget->dev.driver = NULL;
 520         return ret;
 521 }
 522
 523 int usb_udc_attach_driver(const char *name, struct usb_gadget_driver *driver)
 524 {
 525         struct usb_udc *udc = NULL;
 526         int ret = -ENODEV;
 527
 528         mutex_lock(&udc_lock);
 529         list_for_each_entry(udc, &udc_list, list) {
 530                 ret = strcmp(name, dev_name(&udc->dev));
 531                 if (!ret)
 532                         break;
 533         }
 534         if (ret) {
 535                 ret = -ENODEV;
 536                 goto out;
 537         }
 538         if (udc->driver) {
 539                 ret = -EBUSY;
 540                 goto out;
 541         }
 542         ret = udc_bind_to_driver(udc, driver);
 543 out:
 544         mutex_unlock(&udc_lock);
 545         return ret;
 546 }
 547 EXPORT_SYMBOL_GPL(usb_udc_attach_driver);
 548
 549 int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
 550 {
 551         struct usb_udc          *udc = NULL;
 552         int                     ret;
 553
 554         if (!driver || !driver->bind || !driver->setup)
 555                 return -EINVAL;
 556
 557         mutex_lock(&udc_lock);
 558         list_for_each_entry(udc, &udc_list, list) {
 559                 /* For now we take the first one */
 560                 if (!udc->driver)
 561                         goto found;
 562         }
 563
 564         pr_debug("couldn't find an available UDC\n");
 565         mutex_unlock(&udc_lock);
 566         return -ENODEV;
 567 found:
 568         ret = udc_bind_to_driver(udc, driver);
 569         mutex_unlock(&udc_lock);
 570         return ret;
 571 }
 572 EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
 573
 574 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 575 {
 576         struct usb_udc          *udc = NULL;
 577         int                     ret = -ENODEV;
 578
 579         if (!driver || !driver->unbind)
 580                 return -EINVAL;
 581
 582         mutex_lock(&udc_lock);
 583         list_for_each_entry(udc, &udc_list, list)
 584                 if (udc->driver == driver) {
 585                         usb_gadget_remove_driver(udc);
 586                         usb_gadget_set_state(udc->gadget,
 587                                         USB_STATE_NOTATTACHED);
 588                         ret = 0;
 589                         break;
 590                 }
 591
 592         mutex_unlock(&udc_lock);
 593         return ret;
 594 }
 595 EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
 596
 597 /* ------------------------------------------------------------------------- */
 598
 599 static ssize_t usb_udc_srp_store(struct device *dev,
 600                 struct device_attribute *attr, const char *buf, size_t n)
 601 {
 602         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 603
 604         if (sysfs_streq(buf, "1"))
 605                 usb_gadget_wakeup(udc->gadget);
 606
 607         return n;
 608 }
 609 static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);
 610
 611 static ssize_t usb_udc_softconn_store(struct device *dev,
 612                 struct device_attribute *attr, const char *buf, size_t n)
 613 {
 614         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 615
 616         if (!udc->driver) {
 617                 dev_err(dev, "soft-connect without a gadget driver\n");
 618                 return -EOPNOTSUPP;
 619         }
 620
 621         if (sysfs_streq(buf, "connect")) {
 622                 usb_gadget_udc_start(udc);
 623                 usb_gadget_connect(udc->gadget);
 624         } else if (sysfs_streq(buf, "disconnect")) {
 625                 usb_gadget_disconnect(udc->gadget);
 626                 udc->driver->disconnect(udc->gadget);
 627                 usb_gadget_udc_stop(udc);
 628         } else {
 629                 dev_err(dev, "unsupported command '%s'\n", buf);
 630                 return -EINVAL;
 631         }
 632
 633         return n;
 634 }
 635 static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
 636
 637 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 638                           char *buf)
 639 {
 640         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 641         struct usb_gadget       *gadget = udc->gadget;
 642
 643         return sprintf(buf, "%s\n", usb_state_string(gadget->state));
 644 }
 645 static DEVICE_ATTR_RO(state);
 646
 647 #define USB_UDC_SPEED_ATTR(name, param)                                 \
 648 ssize_t name##_show(struct device *dev,                                 \
 649                 struct device_attribute *attr, char *buf)               \
 650 {                                                                       \
 651         struct usb_udc *udc = container_of(dev, struct usb_udc, dev);   \
 652         return snprintf(buf, PAGE_SIZE, "%s\n",                         \
 653                         usb_speed_string(udc->gadget->param));          \
 654 }                                                                       \
 655 static DEVICE_ATTR_RO(name)
 656
 657 static USB_UDC_SPEED_ATTR(current_speed, speed);
 658 static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
 659
 660 #define USB_UDC_ATTR(name)                                      \
 661 ssize_t name##_show(struct device *dev,                         \
 662                 struct device_attribute *attr, char *buf)       \
 663 {                                                               \
 664         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev); \
 665         struct usb_gadget       *gadget = udc->gadget;          \
 666                                                                 \
 667         return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name);  \
 668 }                                                               \
 669 static DEVICE_ATTR_RO(name)
 670
 671 static USB_UDC_ATTR(is_otg);
 672 static USB_UDC_ATTR(is_a_peripheral);
 673 static USB_UDC_ATTR(b_hnp_enable);
 674 static USB_UDC_ATTR(a_hnp_support);
 675 static USB_UDC_ATTR(a_alt_hnp_support);
 676 static USB_UDC_ATTR(is_selfpowered);
 677
 678 static struct attribute *usb_udc_attrs[] = {
 679         &dev_attr_srp.attr,
 680         &dev_attr_soft_connect.attr,
 681         &dev_attr_state.attr,
 682         &dev_attr_current_speed.attr,
 683         &dev_attr_maximum_speed.attr,
 684
 685         &dev_attr_is_otg.attr,
 686         &dev_attr_is_a_peripheral.attr,
 687         &dev_attr_b_hnp_enable.attr,
 688         &dev_attr_a_hnp_support.attr,
 689         &dev_attr_a_alt_hnp_support.attr,
 690         &dev_attr_is_selfpowered.attr,
 691         NULL,
 692 };
 693
 694 static const struct attribute_group usb_udc_attr_group = {
 695         .attrs = usb_udc_attrs,
 696 };
 697
 698 static const struct attribute_group *usb_udc_attr_groups[] = {
 699         &usb_udc_attr_group,
 700         NULL,
 701 };
 702
 703 static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env)
 704 {
 705         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 706         int                     ret;
 707
 708         ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
 709         if (ret) {
 710                 dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
 711                 return ret;
 712         }
 713
 714         if (udc->driver) {
 715                 ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
 716                                 udc->driver->function);
 717                 if (ret) {
 718                         dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
 719                         return ret;
 720                 }
 721         }
 722
 723         return 0;
 724 }
 725
 726 static int __init usb_udc_init(void)
 727 {
 728         udc_class = class_create(THIS_MODULE, "udc");
 729         if (IS_ERR(udc_class)) {
 730                 pr_err("failed to create udc class --> %ld\n",
 731                                 PTR_ERR(udc_class));
 732                 return PTR_ERR(udc_class);
 733         }
 734
 735         udc_class->dev_uevent = usb_udc_uevent;
 736         return 0;
 737 }
 738 subsys_initcall(usb_udc_init);
 739
 740 static void __exit usb_udc_exit(void)
 741 {
 742         class_destroy(udc_class);
 743 }
 744 module_exit(usb_udc_exit);
 745
 746 MODULE_DESCRIPTION("UDC Framework");
 747 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 748 MODULE_LICENSE("GPL v2");