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 LIST_HEAD(gadget_driver_pending_list);
  55 static DEFINE_MUTEX(udc_lock);
  56
  57 static int udc_bind_to_driver(struct usb_udc *udc,
  58                 struct usb_gadget_driver *driver);
  59
  60 /* ------------------------------------------------------------------------- */
  61
  62 #ifdef  CONFIG_HAS_DMA
  63
  64 int usb_gadget_map_request(struct usb_gadget *gadget,
  65                 struct usb_request *req, int is_in)
  66 {
  67         struct device *dev = gadget->dev.parent;
  68
  69         if (req->length == 0)
  70                 return 0;
  71
  72         if (req->num_sgs) {
  73                 int     mapped;
  74
  75                 mapped = dma_map_sg(dev, req->sg, req->num_sgs,
  76                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  77                 if (mapped == 0) {
  78                         dev_err(dev, "failed to map SGs\n");
  79                         return -EFAULT;
  80                 }
  81
  82                 req->num_mapped_sgs = mapped;
  83         } else {
  84                 req->dma = dma_map_single(dev, req->buf, req->length,
  85                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  86
  87                 if (dma_mapping_error(dev, req->dma)) {
  88                         dev_err(dev, "failed to map buffer\n");
  89                         return -EFAULT;
  90                 }
  91         }
  92
  93         return 0;
  94 }
  95 EXPORT_SYMBOL_GPL(usb_gadget_map_request);
  96
  97 void usb_gadget_unmap_request(struct usb_gadget *gadget,
  98                 struct usb_request *req, int is_in)
  99 {
 100         if (req->length == 0)
 101                 return;
 102
 103         if (req->num_mapped_sgs) {
 104                 dma_unmap_sg(gadget->dev.parent, req->sg, req->num_mapped_sgs,
 105                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 106
 107                 req->num_mapped_sgs = 0;
 108         } else {
 109                 dma_unmap_single(gadget->dev.parent, req->dma, req->length,
 110                                 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 111         }
 112 }
 113 EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 114
 115 #endif  /* CONFIG_HAS_DMA */
 116
 117 /* ------------------------------------------------------------------------- */
 118
 119 /**
 120  * usb_gadget_giveback_request - give the request back to the gadget layer
 121  * Context: in_interrupt()
 122  *
 123  * This is called by device controller drivers in order to return the
 124  * completed request back to the gadget layer.
 125  */
 126 void usb_gadget_giveback_request(struct usb_ep *ep,
 127                 struct usb_request *req)
 128 {
 129         if (likely(req->status == 0))
 130                 usb_led_activity(USB_LED_EVENT_GADGET);
 131
 132         req->complete(ep, req);
 133 }
 134 EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
 135
 136 /* ------------------------------------------------------------------------- */
 137
 138 /**
 139  * gadget_find_ep_by_name - returns ep whose name is the same as sting passed
 140  *      in second parameter or NULL if searched endpoint not found
 141  * @g: controller to check for quirk
 142  * @name: name of searched endpoint
 143  */
 144 struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name)
 145 {
 146         struct usb_ep *ep;
 147
 148         gadget_for_each_ep(ep, g) {
 149                 if (!strcmp(ep->name, name))
 150                         return ep;
 151         }
 152
 153         return NULL;
 154 }
 155 EXPORT_SYMBOL_GPL(gadget_find_ep_by_name);
 156
 157 /* ------------------------------------------------------------------------- */
 158
 159 int usb_gadget_ep_match_desc(struct usb_gadget *gadget,
 160                 struct usb_ep *ep, struct usb_endpoint_descriptor *desc,
 161                 struct usb_ss_ep_comp_descriptor *ep_comp)
 162 {
 163         u8              type;
 164         u16             max;
 165         int             num_req_streams = 0;
 166
 167         /* endpoint already claimed? */
 168         if (ep->claimed)
 169                 return 0;
 170
 171         type = usb_endpoint_type(desc);
 172         max = 0x7ff & usb_endpoint_maxp(desc);
 173
 174         if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in)
 175                 return 0;
 176         if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out)
 177                 return 0;
 178
 179         if (max > ep->maxpacket_limit)
 180                 return 0;
 181
 182         /* "high bandwidth" works only at high speed */
 183         if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp(desc) & (3<<11))
 184                 return 0;
 185
 186         switch (type) {
 187         case USB_ENDPOINT_XFER_CONTROL:
 188                 /* only support ep0 for portable CONTROL traffic */
 189                 return 0;
 190         case USB_ENDPOINT_XFER_ISOC:
 191                 if (!ep->caps.type_iso)
 192                         return 0;
 193                 /* ISO:  limit 1023 bytes full speed, 1024 high/super speed */
 194                 if (!gadget_is_dualspeed(gadget) && max > 1023)
 195                         return 0;
 196                 break;
 197         case USB_ENDPOINT_XFER_BULK:
 198                 if (!ep->caps.type_bulk)
 199                         return 0;
 200                 if (ep_comp && gadget_is_superspeed(gadget)) {
 201                         /* Get the number of required streams from the
 202                          * EP companion descriptor and see if the EP
 203                          * matches it
 204                          */
 205                         num_req_streams = ep_comp->bmAttributes & 0x1f;
 206                         if (num_req_streams > ep->max_streams)
 207                                 return 0;
 208                 }
 209                 break;
 210         case USB_ENDPOINT_XFER_INT:
 211                 /* Bulk endpoints handle interrupt transfers,
 212                  * except the toggle-quirky iso-synch kind
 213                  */
 214                 if (!ep->caps.type_int && !ep->caps.type_bulk)
 215                         return 0;
 216                 /* INT:  limit 64 bytes full speed, 1024 high/super speed */
 217                 if (!gadget_is_dualspeed(gadget) && max > 64)
 218                         return 0;
 219                 break;
 220         }
 221
 222         return 1;
 223 }
 224 EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc);
 225
 226 /* ------------------------------------------------------------------------- */
 227
 228 static void usb_gadget_state_work(struct work_struct *work)
 229 {
 230         struct usb_gadget *gadget = work_to_gadget(work);
 231         struct usb_udc *udc = gadget->udc;
 232
 233         if (udc)
 234                 sysfs_notify(&udc->dev.kobj, NULL, "state");
 235 }
 236
 237 void usb_gadget_set_state(struct usb_gadget *gadget,
 238                 enum usb_device_state state)
 239 {
 240         gadget->state = state;
 241         schedule_work(&gadget->work);
 242 }
 243 EXPORT_SYMBOL_GPL(usb_gadget_set_state);
 244
 245 /* ------------------------------------------------------------------------- */
 246
 247 static void usb_udc_connect_control(struct usb_udc *udc)
 248 {
 249         if (udc->vbus)
 250                 usb_gadget_connect(udc->gadget);
 251         else
 252                 usb_gadget_disconnect(udc->gadget);
 253 }
 254
 255 /**
 256  * usb_udc_vbus_handler - updates the udc core vbus status, and try to
 257  * connect or disconnect gadget
 258  * @gadget: The gadget which vbus change occurs
 259  * @status: The vbus status
 260  *
 261  * The udc driver calls it when it wants to connect or disconnect gadget
 262  * according to vbus status.
 263  */
 264 void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status)
 265 {
 266         struct usb_udc *udc = gadget->udc;
 267
 268         if (udc) {
 269                 udc->vbus = status;
 270                 usb_udc_connect_control(udc);
 271         }
 272 }
 273 EXPORT_SYMBOL_GPL(usb_udc_vbus_handler);
 274
 275 /**
 276  * usb_gadget_udc_reset - notifies the udc core that bus reset occurs
 277  * @gadget: The gadget which bus reset occurs
 278  * @driver: The gadget driver we want to notify
 279  *
 280  * If the udc driver has bus reset handler, it needs to call this when the bus
 281  * reset occurs, it notifies the gadget driver that the bus reset occurs as
 282  * well as updates gadget state.
 283  */
 284 void usb_gadget_udc_reset(struct usb_gadget *gadget,
 285                 struct usb_gadget_driver *driver)
 286 {
 287         driver->reset(gadget);
 288         usb_gadget_set_state(gadget, USB_STATE_DEFAULT);
 289 }
 290 EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
 291
 292 /**
 293  * usb_gadget_udc_start - tells usb device controller to start up
 294  * @udc: The UDC to be started
 295  *
 296  * This call is issued by the UDC Class driver when it's about
 297  * to register a gadget driver to the device controller, before
 298  * calling gadget driver's bind() method.
 299  *
 300  * It allows the controller to be powered off until strictly
 301  * necessary to have it powered on.
 302  *
 303  * Returns zero on success, else negative errno.
 304  */
 305 static inline int usb_gadget_udc_start(struct usb_udc *udc)
 306 {
 307         return udc->gadget->ops->udc_start(udc->gadget, udc->driver);
 308 }
 309
 310 /**
 311  * usb_gadget_udc_stop - tells usb device controller we don't need it anymore
 312  * @gadget: The device we want to stop activity
 313  * @driver: The driver to unbind from @gadget
 314  *
 315  * This call is issued by the UDC Class driver after calling
 316  * gadget driver's unbind() method.
 317  *
 318  * The details are implementation specific, but it can go as
 319  * far as powering off UDC completely and disable its data
 320  * line pullups.
 321  */
 322 static inline void usb_gadget_udc_stop(struct usb_udc *udc)
 323 {
 324         udc->gadget->ops->udc_stop(udc->gadget);
 325 }
 326
 327 /**
 328  * usb_udc_release - release the usb_udc struct
 329  * @dev: the dev member within usb_udc
 330  *
 331  * This is called by driver's core in order to free memory once the last
 332  * reference is released.
 333  */
 334 static void usb_udc_release(struct device *dev)
 335 {
 336         struct usb_udc *udc;
 337
 338         udc = container_of(dev, struct usb_udc, dev);
 339         dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
 340         kfree(udc);
 341 }
 342
 343 static const struct attribute_group *usb_udc_attr_groups[];
 344
 345 static void usb_udc_nop_release(struct device *dev)
 346 {
 347         dev_vdbg(dev, "%s\n", __func__);
 348 }
 349
 350 /**
 351  * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
 352  * @parent: the parent device to this udc. Usually the controller driver's
 353  * device.
 354  * @gadget: the gadget to be added to the list.
 355  * @release: a gadget release function.
 356  *
 357  * Returns zero on success, negative errno otherwise.
 358  */
 359 int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
 360                 void (*release)(struct device *dev))
 361 {
 362         struct usb_udc          *udc;
 363         struct usb_gadget_driver *driver;
 364         int                     ret = -ENOMEM;
 365
 366         udc = kzalloc(sizeof(*udc), GFP_KERNEL);
 367         if (!udc)
 368                 goto err1;
 369
 370         dev_set_name(&gadget->dev, "gadget");
 371         INIT_WORK(&gadget->work, usb_gadget_state_work);
 372         gadget->dev.parent = parent;
 373
 374         if (release)
 375                 gadget->dev.release = release;
 376         else
 377                 gadget->dev.release = usb_udc_nop_release;
 378
 379         ret = device_register(&gadget->dev);
 380         if (ret)
 381                 goto err2;
 382
 383         device_initialize(&udc->dev);
 384         udc->dev.release = usb_udc_release;
 385         udc->dev.class = udc_class;
 386         udc->dev.groups = usb_udc_attr_groups;
 387         udc->dev.parent = parent;
 388         ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
 389         if (ret)
 390                 goto err3;
 391
 392         udc->gadget = gadget;
 393         gadget->udc = udc;
 394
 395         mutex_lock(&udc_lock);
 396         list_add_tail(&udc->list, &udc_list);
 397
 398         ret = device_add(&udc->dev);
 399         if (ret)
 400                 goto err4;
 401
 402         usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
 403         udc->vbus = true;
 404
 405         /* pick up one of pending gadget drivers */
 406         list_for_each_entry(driver, &gadget_driver_pending_list, pending) {
 407                 if (!driver->udc_name || strcmp(driver->udc_name,
 408                                                 dev_name(&udc->dev)) == 0) {
 409                         ret = udc_bind_to_driver(udc, driver);
 410                         if (ret != -EPROBE_DEFER)
 411                                 list_del(&driver->pending);
 412                         if (ret)
 413                                 goto err4;
 414                         break;
 415                 }
 416         }
 417
 418         mutex_unlock(&udc_lock);
 419
 420         return 0;
 421
 422 err4:
 423         list_del(&udc->list);
 424         mutex_unlock(&udc_lock);
 425
 426 err3:
 427         put_device(&udc->dev);
 428         device_del(&gadget->dev);
 429
 430 err2:
 431         put_device(&gadget->dev);
 432         kfree(udc);
 433
 434 err1:
 435         return ret;
 436 }
 437 EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
 438
 439 /**
 440  * usb_get_gadget_udc_name - get the name of the first UDC controller
 441  * This functions returns the name of the first UDC controller in the system.
 442  * Please note that this interface is usefull only for legacy drivers which
 443  * assume that there is only one UDC controller in the system and they need to
 444  * get its name before initialization. There is no guarantee that the UDC
 445  * of the returned name will be still available, when gadget driver registers
 446  * itself.
 447  *
 448  * Returns pointer to string with UDC controller name on success, NULL
 449  * otherwise. Caller should kfree() returned string.
 450  */
 451 char *usb_get_gadget_udc_name(void)
 452 {
 453         struct usb_udc *udc;
 454         char *name = NULL;
 455
 456         /* For now we take the first available UDC */
 457         mutex_lock(&udc_lock);
 458         list_for_each_entry(udc, &udc_list, list) {
 459                 if (!udc->driver) {
 460                         name = kstrdup(udc->gadget->name, GFP_KERNEL);
 461                         break;
 462                 }
 463         }
 464         mutex_unlock(&udc_lock);
 465         return name;
 466 }
 467 EXPORT_SYMBOL_GPL(usb_get_gadget_udc_name);
 468
 469 /**
 470  * usb_add_gadget_udc - adds a new gadget to the udc class driver list
 471  * @parent: the parent device to this udc. Usually the controller
 472  * driver's device.
 473  * @gadget: the gadget to be added to the list
 474  *
 475  * Returns zero on success, negative errno otherwise.
 476  */
 477 int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
 478 {
 479         return usb_add_gadget_udc_release(parent, gadget, NULL);
 480 }
 481 EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
 482
 483 static void usb_gadget_remove_driver(struct usb_udc *udc)
 484 {
 485         dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
 486                         udc->driver->function);
 487
 488         kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 489
 490         usb_gadget_disconnect(udc->gadget);
 491         udc->driver->disconnect(udc->gadget);
 492         udc->driver->unbind(udc->gadget);
 493         usb_gadget_udc_stop(udc);
 494
 495         udc->driver = NULL;
 496         udc->dev.driver = NULL;
 497         udc->gadget->dev.driver = NULL;
 498 }
 499
 500 /**
 501  * usb_del_gadget_udc - deletes @udc from udc_list
 502  * @gadget: the gadget to be removed.
 503  *
 504  * This, will call usb_gadget_unregister_driver() if
 505  * the @udc is still busy.
 506  */
 507 void usb_del_gadget_udc(struct usb_gadget *gadget)
 508 {
 509         struct usb_udc *udc = gadget->udc;
 510
 511         if (!udc)
 512                 return;
 513
 514         dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
 515
 516         mutex_lock(&udc_lock);
 517         list_del(&udc->list);
 518
 519         if (udc->driver) {
 520                 struct usb_gadget_driver *driver = udc->driver;
 521
 522                 usb_gadget_remove_driver(udc);
 523                 list_add(&driver->pending, &gadget_driver_pending_list);
 524         }
 525         mutex_unlock(&udc_lock);
 526
 527         kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
 528         flush_work(&gadget->work);
 529         device_unregister(&udc->dev);
 530         device_unregister(&gadget->dev);
 531 }
 532 EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
 533
 534 /* ------------------------------------------------------------------------- */
 535
 536 static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
 537 {
 538         int ret;
 539
 540         dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
 541                         driver->function);
 542
 543         udc->driver = driver;
 544         udc->dev.driver = &driver->driver;
 545         udc->gadget->dev.driver = &driver->driver;
 546
 547         ret = driver->bind(udc->gadget, driver);
 548         if (ret)
 549                 goto err1;
 550         ret = usb_gadget_udc_start(udc);
 551         if (ret) {
 552                 driver->unbind(udc->gadget);
 553                 goto err1;
 554         }
 555         usb_udc_connect_control(udc);
 556
 557         kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 558         return 0;
 559 err1:
 560         if (ret != -EISNAM)
 561                 dev_err(&udc->dev, "failed to start %s: %d\n",
 562                         udc->driver->function, ret);
 563         udc->driver = NULL;
 564         udc->dev.driver = NULL;
 565         udc->gadget->dev.driver = NULL;
 566         return ret;
 567 }
 568
 569 int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
 570 {
 571         struct usb_udc          *udc = NULL;
 572         int                     ret = -ENODEV;
 573
 574         if (!driver || !driver->bind || !driver->setup)
 575                 return -EINVAL;
 576
 577         mutex_lock(&udc_lock);
 578         if (driver->udc_name) {
 579                 list_for_each_entry(udc, &udc_list, list) {
 580                         ret = strcmp(driver->udc_name, dev_name(&udc->dev));
 581                         if (!ret)
 582                                 break;
 583                 }
 584                 if (!ret && !udc->driver)
 585                         goto found;
 586         } else {
 587                 list_for_each_entry(udc, &udc_list, list) {
 588                         /* For now we take the first one */
 589                         if (!udc->driver)
 590                                 goto found;
 591                 }
 592         }
 593
 594         list_add_tail(&driver->pending, &gadget_driver_pending_list);
 595         pr_info("udc-core: couldn't find an available UDC - added [%s] to list of pending drivers\n",
 596                 driver->function);
 597         mutex_unlock(&udc_lock);
 598         return 0;
 599 found:
 600         ret = udc_bind_to_driver(udc, driver);
 601         mutex_unlock(&udc_lock);
 602         return ret;
 603 }
 604 EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
 605
 606 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 607 {
 608         struct usb_udc          *udc = NULL;
 609         int                     ret = -ENODEV;
 610
 611         if (!driver || !driver->unbind)
 612                 return -EINVAL;
 613
 614         mutex_lock(&udc_lock);
 615         list_for_each_entry(udc, &udc_list, list)
 616                 if (udc->driver == driver) {
 617                         usb_gadget_remove_driver(udc);
 618                         usb_gadget_set_state(udc->gadget,
 619                                         USB_STATE_NOTATTACHED);
 620                         ret = 0;
 621                         break;
 622                 }
 623
 624         if (ret) {
 625                 list_del(&driver->pending);
 626                 ret = 0;
 627         }
 628         mutex_unlock(&udc_lock);
 629         return ret;
 630 }
 631 EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
 632
 633 /* ------------------------------------------------------------------------- */
 634
 635 static ssize_t usb_udc_srp_store(struct device *dev,
 636                 struct device_attribute *attr, const char *buf, size_t n)
 637 {
 638         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 639
 640         if (sysfs_streq(buf, "1"))
 641                 usb_gadget_wakeup(udc->gadget);
 642
 643         return n;
 644 }
 645 static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);
 646
 647 static ssize_t usb_udc_softconn_store(struct device *dev,
 648                 struct device_attribute *attr, const char *buf, size_t n)
 649 {
 650         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 651
 652         if (!udc->driver) {
 653                 dev_err(dev, "soft-connect without a gadget driver\n");
 654                 return -EOPNOTSUPP;
 655         }
 656
 657         if (sysfs_streq(buf, "connect")) {
 658                 usb_gadget_udc_start(udc);
 659                 usb_gadget_connect(udc->gadget);
 660         } else if (sysfs_streq(buf, "disconnect")) {
 661                 usb_gadget_disconnect(udc->gadget);
 662                 udc->driver->disconnect(udc->gadget);
 663                 usb_gadget_udc_stop(udc);
 664         } else {
 665                 dev_err(dev, "unsupported command '%s'\n", buf);
 666                 return -EINVAL;
 667         }
 668
 669         return n;
 670 }
 671 static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
 672
 673 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 674                           char *buf)
 675 {
 676         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 677         struct usb_gadget       *gadget = udc->gadget;
 678
 679         return sprintf(buf, "%s\n", usb_state_string(gadget->state));
 680 }
 681 static DEVICE_ATTR_RO(state);
 682
 683 #define USB_UDC_SPEED_ATTR(name, param)                                 \
 684 ssize_t name##_show(struct device *dev,                                 \
 685                 struct device_attribute *attr, char *buf)               \
 686 {                                                                       \
 687         struct usb_udc *udc = container_of(dev, struct usb_udc, dev);   \
 688         return snprintf(buf, PAGE_SIZE, "%s\n",                         \
 689                         usb_speed_string(udc->gadget->param));          \
 690 }                                                                       \
 691 static DEVICE_ATTR_RO(name)
 692
 693 static USB_UDC_SPEED_ATTR(current_speed, speed);
 694 static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
 695
 696 #define USB_UDC_ATTR(name)                                      \
 697 ssize_t name##_show(struct device *dev,                         \
 698                 struct device_attribute *attr, char *buf)       \
 699 {                                                               \
 700         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev); \
 701         struct usb_gadget       *gadget = udc->gadget;          \
 702                                                                 \
 703         return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name);  \
 704 }                                                               \
 705 static DEVICE_ATTR_RO(name)
 706
 707 static USB_UDC_ATTR(is_otg);
 708 static USB_UDC_ATTR(is_a_peripheral);
 709 static USB_UDC_ATTR(b_hnp_enable);
 710 static USB_UDC_ATTR(a_hnp_support);
 711 static USB_UDC_ATTR(a_alt_hnp_support);
 712 static USB_UDC_ATTR(is_selfpowered);
 713
 714 static struct attribute *usb_udc_attrs[] = {
 715         &dev_attr_srp.attr,
 716         &dev_attr_soft_connect.attr,
 717         &dev_attr_state.attr,
 718         &dev_attr_current_speed.attr,
 719         &dev_attr_maximum_speed.attr,
 720
 721         &dev_attr_is_otg.attr,
 722         &dev_attr_is_a_peripheral.attr,
 723         &dev_attr_b_hnp_enable.attr,
 724         &dev_attr_a_hnp_support.attr,
 725         &dev_attr_a_alt_hnp_support.attr,
 726         &dev_attr_is_selfpowered.attr,
 727         NULL,
 728 };
 729
 730 static const struct attribute_group usb_udc_attr_group = {
 731         .attrs = usb_udc_attrs,
 732 };
 733
 734 static const struct attribute_group *usb_udc_attr_groups[] = {
 735         &usb_udc_attr_group,
 736         NULL,
 737 };
 738
 739 static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env)
 740 {
 741         struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
 742         int                     ret;
 743
 744         ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
 745         if (ret) {
 746                 dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
 747                 return ret;
 748         }
 749
 750         if (udc->driver) {
 751                 ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
 752                                 udc->driver->function);
 753                 if (ret) {
 754                         dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
 755                         return ret;
 756                 }
 757         }
 758
 759         return 0;
 760 }
 761
 762 static int __init usb_udc_init(void)
 763 {
 764         udc_class = class_create(THIS_MODULE, "udc");
 765         if (IS_ERR(udc_class)) {
 766                 pr_err("failed to create udc class --> %ld\n",
 767                                 PTR_ERR(udc_class));
 768                 return PTR_ERR(udc_class);
 769         }
 770
 771         udc_class->dev_uevent = usb_udc_uevent;
 772         return 0;
 773 }
 774 subsys_initcall(usb_udc_init);
 775
 776 static void __exit usb_udc_exit(void)
 777 {
 778         class_destroy(udc_class);
 779 }
 780 module_exit(usb_udc_exit);
 781
 782 MODULE_DESCRIPTION("UDC Framework");
 783 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 784 MODULE_LICENSE("GPL v2");