1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * phy.c -- USB phy handling 4 * 5 * Copyright (C) 2004-2013 Texas Instruments 6 */ 7 #include <linux/kernel.h> 8 #include <linux/export.h> 9 #include <linux/err.h> 10 #include <linux/device.h> 11 #include <linux/module.h> 12 #include <linux/slab.h> 13 #include <linux/of.h> 14 15 #include <linux/usb/phy.h> 16 17 /* Default current range by charger type. */ 18 #define DEFAULT_SDP_CUR_MIN 2 19 #define DEFAULT_SDP_CUR_MAX 500 20 #define DEFAULT_SDP_CUR_MIN_SS 150 21 #define DEFAULT_SDP_CUR_MAX_SS 900 22 #define DEFAULT_DCP_CUR_MIN 500 23 #define DEFAULT_DCP_CUR_MAX 5000 24 #define DEFAULT_CDP_CUR_MIN 1500 25 #define DEFAULT_CDP_CUR_MAX 5000 26 #define DEFAULT_ACA_CUR_MIN 1500 27 #define DEFAULT_ACA_CUR_MAX 5000 28 29 static LIST_HEAD(phy_list); 30 static DEFINE_SPINLOCK(phy_lock); 31 32 struct phy_devm { 33 struct usb_phy *phy; 34 struct notifier_block *nb; 35 }; 36 37 static const char *const usb_chger_type[] = { 38 [UNKNOWN_TYPE] = "USB_CHARGER_UNKNOWN_TYPE", 39 [SDP_TYPE] = "USB_CHARGER_SDP_TYPE", 40 [CDP_TYPE] = "USB_CHARGER_CDP_TYPE", 41 [DCP_TYPE] = "USB_CHARGER_DCP_TYPE", 42 [ACA_TYPE] = "USB_CHARGER_ACA_TYPE", 43 }; 44 45 static const char *const usb_chger_state[] = { 46 [USB_CHARGER_DEFAULT] = "USB_CHARGER_DEFAULT", 47 [USB_CHARGER_PRESENT] = "USB_CHARGER_PRESENT", 48 [USB_CHARGER_ABSENT] = "USB_CHARGER_ABSENT", 49 }; 50 51 static struct usb_phy *__usb_find_phy(struct list_head *list, 52 enum usb_phy_type type) 53 { 54 struct usb_phy *phy = NULL; 55 56 list_for_each_entry(phy, list, head) { 57 if (phy->type != type) 58 continue; 59 60 return phy; 61 } 62 63 return ERR_PTR(-ENODEV); 64 } 65 66 static struct usb_phy *__of_usb_find_phy(struct device_node *node) 67 { 68 struct usb_phy *phy; 69 70 if (!of_device_is_available(node)) 71 return ERR_PTR(-ENODEV); 72 73 list_for_each_entry(phy, &phy_list, head) { 74 if (node != phy->dev->of_node) 75 continue; 76 77 return phy; 78 } 79 80 return ERR_PTR(-EPROBE_DEFER); 81 } 82 83 static struct usb_phy *__device_to_usb_phy(const struct device *dev) 84 { 85 struct usb_phy *usb_phy; 86 87 list_for_each_entry(usb_phy, &phy_list, head) { 88 if (usb_phy->dev == dev) 89 return usb_phy; 90 } 91 92 return NULL; 93 } 94 95 static void usb_phy_set_default_current(struct usb_phy *usb_phy) 96 { 97 usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN; 98 usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX; 99 usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN; 100 usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX; 101 usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN; 102 usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX; 103 usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN; 104 usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX; 105 } 106 107 /** 108 * usb_phy_notify_charger_work - notify the USB charger state 109 * @work: the charger work to notify the USB charger state 110 * 111 * This work can be issued when USB charger state has been changed or 112 * USB charger current has been changed, then we can notify the current 113 * what can be drawn to power user and the charger state to userspace. 114 * 115 * If we get the charger type from extcon subsystem, we can notify the 116 * charger state to power user automatically by usb_phy_get_charger_type() 117 * issuing from extcon subsystem. 118 * 119 * If we get the charger type from ->charger_detect() instead of extcon 120 * subsystem, the usb phy driver should issue usb_phy_set_charger_state() 121 * to set charger state when the charger state has been changed. 122 */ 123 static void usb_phy_notify_charger_work(struct work_struct *work) 124 { 125 struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work); 126 unsigned int min, max; 127 128 switch (usb_phy->chg_state) { 129 case USB_CHARGER_PRESENT: 130 usb_phy_get_charger_current(usb_phy, &min, &max); 131 132 atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy); 133 break; 134 case USB_CHARGER_ABSENT: 135 usb_phy_set_default_current(usb_phy); 136 137 atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy); 138 break; 139 default: 140 dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n", 141 usb_phy->chg_state); 142 return; 143 } 144 145 kobject_uevent(&usb_phy->dev->kobj, KOBJ_CHANGE); 146 } 147 148 static int usb_phy_uevent(const struct device *dev, struct kobj_uevent_env *env) 149 { 150 const struct usb_phy *usb_phy; 151 char uchger_state[50] = { 0 }; 152 char uchger_type[50] = { 0 }; 153 unsigned long flags; 154 155 spin_lock_irqsave(&phy_lock, flags); 156 usb_phy = __device_to_usb_phy(dev); 157 spin_unlock_irqrestore(&phy_lock, flags); 158 159 if (!usb_phy) 160 return -ENODEV; 161 162 snprintf(uchger_state, ARRAY_SIZE(uchger_state), 163 "USB_CHARGER_STATE=%s", usb_chger_state[usb_phy->chg_state]); 164 165 snprintf(uchger_type, ARRAY_SIZE(uchger_type), 166 "USB_CHARGER_TYPE=%s", usb_chger_type[usb_phy->chg_type]); 167 168 if (add_uevent_var(env, uchger_state)) 169 return -ENOMEM; 170 171 if (add_uevent_var(env, uchger_type)) 172 return -ENOMEM; 173 174 return 0; 175 } 176 177 static void __usb_phy_get_charger_type(struct usb_phy *usb_phy) 178 { 179 if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) { 180 usb_phy->chg_type = SDP_TYPE; 181 usb_phy->chg_state = USB_CHARGER_PRESENT; 182 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) { 183 usb_phy->chg_type = CDP_TYPE; 184 usb_phy->chg_state = USB_CHARGER_PRESENT; 185 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) { 186 usb_phy->chg_type = DCP_TYPE; 187 usb_phy->chg_state = USB_CHARGER_PRESENT; 188 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) { 189 usb_phy->chg_type = ACA_TYPE; 190 usb_phy->chg_state = USB_CHARGER_PRESENT; 191 } else { 192 usb_phy->chg_type = UNKNOWN_TYPE; 193 usb_phy->chg_state = USB_CHARGER_ABSENT; 194 } 195 196 schedule_work(&usb_phy->chg_work); 197 } 198 199 /** 200 * usb_phy_get_charger_type - get charger type from extcon subsystem 201 * @nb: the notifier block to determine charger type 202 * @state: the cable state 203 * @data: private data 204 * 205 * Determin the charger type from extcon subsystem which also means the 206 * charger state has been chaned, then we should notify this event. 207 */ 208 static int usb_phy_get_charger_type(struct notifier_block *nb, 209 unsigned long state, void *data) 210 { 211 struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb); 212 213 __usb_phy_get_charger_type(usb_phy); 214 return NOTIFY_OK; 215 } 216 217 /** 218 * usb_phy_set_charger_current - set the USB charger current 219 * @usb_phy: the USB phy to be used 220 * @mA: the current need to be set 221 * 222 * Usually we only change the charger default current when USB finished the 223 * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power() 224 * will issue this function to change charger current when after setting USB 225 * configuration, or suspend/resume USB. For other type charger, we should 226 * use the default charger current and we do not suggest to issue this function 227 * to change the charger current. 228 * 229 * When USB charger current has been changed, we need to notify the power users. 230 */ 231 void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA) 232 { 233 switch (usb_phy->chg_type) { 234 case SDP_TYPE: 235 if (usb_phy->chg_cur.sdp_max == mA) 236 return; 237 238 usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ? 239 DEFAULT_SDP_CUR_MAX_SS : mA; 240 break; 241 case DCP_TYPE: 242 if (usb_phy->chg_cur.dcp_max == mA) 243 return; 244 245 usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ? 246 DEFAULT_DCP_CUR_MAX : mA; 247 break; 248 case CDP_TYPE: 249 if (usb_phy->chg_cur.cdp_max == mA) 250 return; 251 252 usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ? 253 DEFAULT_CDP_CUR_MAX : mA; 254 break; 255 case ACA_TYPE: 256 if (usb_phy->chg_cur.aca_max == mA) 257 return; 258 259 usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ? 260 DEFAULT_ACA_CUR_MAX : mA; 261 break; 262 default: 263 return; 264 } 265 266 schedule_work(&usb_phy->chg_work); 267 } 268 EXPORT_SYMBOL_GPL(usb_phy_set_charger_current); 269 270 /** 271 * usb_phy_get_charger_current - get the USB charger current 272 * @usb_phy: the USB phy to be used 273 * @min: the minimum current 274 * @max: the maximum current 275 * 276 * Usually we will notify the maximum current to power user, but for some 277 * special case, power user also need the minimum current value. Then the 278 * power user can issue this function to get the suitable current. 279 */ 280 void usb_phy_get_charger_current(struct usb_phy *usb_phy, 281 unsigned int *min, unsigned int *max) 282 { 283 switch (usb_phy->chg_type) { 284 case SDP_TYPE: 285 *min = usb_phy->chg_cur.sdp_min; 286 *max = usb_phy->chg_cur.sdp_max; 287 break; 288 case DCP_TYPE: 289 *min = usb_phy->chg_cur.dcp_min; 290 *max = usb_phy->chg_cur.dcp_max; 291 break; 292 case CDP_TYPE: 293 *min = usb_phy->chg_cur.cdp_min; 294 *max = usb_phy->chg_cur.cdp_max; 295 break; 296 case ACA_TYPE: 297 *min = usb_phy->chg_cur.aca_min; 298 *max = usb_phy->chg_cur.aca_max; 299 break; 300 default: 301 *min = 0; 302 *max = 0; 303 break; 304 } 305 } 306 EXPORT_SYMBOL_GPL(usb_phy_get_charger_current); 307 308 /** 309 * usb_phy_set_charger_state - set the USB charger state 310 * @usb_phy: the USB phy to be used 311 * @state: the new state need to be set for charger 312 * 313 * The usb phy driver can issue this function when the usb phy driver 314 * detected the charger state has been changed, in this case the charger 315 * type should be get from ->charger_detect(). 316 */ 317 void usb_phy_set_charger_state(struct usb_phy *usb_phy, 318 enum usb_charger_state state) 319 { 320 if (usb_phy->chg_state == state || !usb_phy->charger_detect) 321 return; 322 323 usb_phy->chg_state = state; 324 if (usb_phy->chg_state == USB_CHARGER_PRESENT) 325 usb_phy->chg_type = usb_phy->charger_detect(usb_phy); 326 else 327 usb_phy->chg_type = UNKNOWN_TYPE; 328 329 schedule_work(&usb_phy->chg_work); 330 } 331 EXPORT_SYMBOL_GPL(usb_phy_set_charger_state); 332 333 static void devm_usb_phy_release(struct device *dev, void *res) 334 { 335 struct usb_phy *phy = *(struct usb_phy **)res; 336 337 usb_put_phy(phy); 338 } 339 340 static void devm_usb_phy_release2(struct device *dev, void *_res) 341 { 342 struct phy_devm *res = _res; 343 344 if (res->nb) 345 usb_unregister_notifier(res->phy, res->nb); 346 usb_put_phy(res->phy); 347 } 348 349 static void usb_charger_init(struct usb_phy *usb_phy) 350 { 351 usb_phy->chg_type = UNKNOWN_TYPE; 352 usb_phy->chg_state = USB_CHARGER_DEFAULT; 353 usb_phy_set_default_current(usb_phy); 354 INIT_WORK(&usb_phy->chg_work, usb_phy_notify_charger_work); 355 } 356 357 static int usb_add_extcon(struct usb_phy *x) 358 { 359 int ret; 360 361 if (of_property_present(x->dev->of_node, "extcon")) { 362 x->edev = extcon_get_edev_by_phandle(x->dev, 0); 363 if (IS_ERR(x->edev)) 364 return PTR_ERR(x->edev); 365 366 x->id_edev = extcon_get_edev_by_phandle(x->dev, 1); 367 if (IS_ERR(x->id_edev)) { 368 x->id_edev = NULL; 369 dev_info(x->dev, "No separate ID extcon device\n"); 370 } 371 372 if (x->vbus_nb.notifier_call) { 373 ret = devm_extcon_register_notifier(x->dev, x->edev, 374 EXTCON_USB, 375 &x->vbus_nb); 376 if (ret < 0) { 377 dev_err(x->dev, 378 "register VBUS notifier failed\n"); 379 return ret; 380 } 381 } else { 382 x->type_nb.notifier_call = usb_phy_get_charger_type; 383 384 ret = devm_extcon_register_notifier(x->dev, x->edev, 385 EXTCON_CHG_USB_SDP, 386 &x->type_nb); 387 if (ret) { 388 dev_err(x->dev, 389 "register extcon USB SDP failed.\n"); 390 return ret; 391 } 392 393 ret = devm_extcon_register_notifier(x->dev, x->edev, 394 EXTCON_CHG_USB_CDP, 395 &x->type_nb); 396 if (ret) { 397 dev_err(x->dev, 398 "register extcon USB CDP failed.\n"); 399 return ret; 400 } 401 402 ret = devm_extcon_register_notifier(x->dev, x->edev, 403 EXTCON_CHG_USB_DCP, 404 &x->type_nb); 405 if (ret) { 406 dev_err(x->dev, 407 "register extcon USB DCP failed.\n"); 408 return ret; 409 } 410 411 ret = devm_extcon_register_notifier(x->dev, x->edev, 412 EXTCON_CHG_USB_ACA, 413 &x->type_nb); 414 if (ret) { 415 dev_err(x->dev, 416 "register extcon USB ACA failed.\n"); 417 return ret; 418 } 419 } 420 421 if (x->id_nb.notifier_call) { 422 struct extcon_dev *id_ext; 423 424 if (x->id_edev) 425 id_ext = x->id_edev; 426 else 427 id_ext = x->edev; 428 429 ret = devm_extcon_register_notifier(x->dev, id_ext, 430 EXTCON_USB_HOST, 431 &x->id_nb); 432 if (ret < 0) { 433 dev_err(x->dev, 434 "register ID notifier failed\n"); 435 return ret; 436 } 437 } 438 } 439 440 if (x->type_nb.notifier_call) 441 __usb_phy_get_charger_type(x); 442 443 return 0; 444 } 445 446 /** 447 * devm_usb_get_phy - find the USB PHY 448 * @dev: device that requests this phy 449 * @type: the type of the phy the controller requires 450 * 451 * Gets the phy using usb_get_phy(), and associates a device with it using 452 * devres. On driver detach, release function is invoked on the devres data, 453 * then, devres data is freed. 454 * 455 * For use by USB host and peripheral drivers. 456 */ 457 struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type) 458 { 459 struct usb_phy **ptr, *phy; 460 461 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL); 462 if (!ptr) 463 return ERR_PTR(-ENOMEM); 464 465 phy = usb_get_phy(type); 466 if (!IS_ERR(phy)) { 467 *ptr = phy; 468 devres_add(dev, ptr); 469 } else 470 devres_free(ptr); 471 472 return phy; 473 } 474 EXPORT_SYMBOL_GPL(devm_usb_get_phy); 475 476 /** 477 * usb_get_phy - find the USB PHY 478 * @type: the type of the phy the controller requires 479 * 480 * Returns the phy driver, after getting a refcount to it; or 481 * -ENODEV if there is no such phy. The caller is responsible for 482 * calling usb_put_phy() to release that count. 483 * 484 * For use by USB host and peripheral drivers. 485 */ 486 struct usb_phy *usb_get_phy(enum usb_phy_type type) 487 { 488 struct usb_phy *phy = NULL; 489 unsigned long flags; 490 491 spin_lock_irqsave(&phy_lock, flags); 492 493 phy = __usb_find_phy(&phy_list, type); 494 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) { 495 pr_debug("PHY: unable to find transceiver of type %s\n", 496 usb_phy_type_string(type)); 497 if (!IS_ERR(phy)) 498 phy = ERR_PTR(-ENODEV); 499 500 goto err0; 501 } 502 503 get_device(phy->dev); 504 505 err0: 506 spin_unlock_irqrestore(&phy_lock, flags); 507 508 return phy; 509 } 510 EXPORT_SYMBOL_GPL(usb_get_phy); 511 512 /** 513 * devm_usb_get_phy_by_node - find the USB PHY by device_node 514 * @dev: device that requests this phy 515 * @node: the device_node for the phy device. 516 * @nb: a notifier_block to register with the phy. 517 * 518 * Returns the phy driver associated with the given device_node, 519 * after getting a refcount to it, -ENODEV if there is no such phy or 520 * -EPROBE_DEFER if the device is not yet loaded. While at that, it 521 * also associates the device with 522 * the phy using devres. On driver detach, release function is invoked 523 * on the devres data, then, devres data is freed. 524 * 525 * For use by peripheral drivers for devices related to a phy, 526 * such as a charger. 527 */ 528 struct usb_phy *devm_usb_get_phy_by_node(struct device *dev, 529 struct device_node *node, 530 struct notifier_block *nb) 531 { 532 struct usb_phy *phy = ERR_PTR(-ENOMEM); 533 struct phy_devm *ptr; 534 unsigned long flags; 535 536 ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL); 537 if (!ptr) { 538 dev_dbg(dev, "failed to allocate memory for devres\n"); 539 goto err0; 540 } 541 542 spin_lock_irqsave(&phy_lock, flags); 543 544 phy = __of_usb_find_phy(node); 545 if (IS_ERR(phy)) { 546 devres_free(ptr); 547 goto err1; 548 } 549 550 if (!try_module_get(phy->dev->driver->owner)) { 551 phy = ERR_PTR(-ENODEV); 552 devres_free(ptr); 553 goto err1; 554 } 555 if (nb) 556 usb_register_notifier(phy, nb); 557 ptr->phy = phy; 558 ptr->nb = nb; 559 devres_add(dev, ptr); 560 561 get_device(phy->dev); 562 563 err1: 564 spin_unlock_irqrestore(&phy_lock, flags); 565 566 err0: 567 568 return phy; 569 } 570 EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node); 571 572 /** 573 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle 574 * @dev: device that requests this phy 575 * @phandle: name of the property holding the phy phandle value 576 * @index: the index of the phy 577 * 578 * Returns the phy driver associated with the given phandle value, 579 * after getting a refcount to it, -ENODEV if there is no such phy or 580 * -EPROBE_DEFER if there is a phandle to the phy, but the device is 581 * not yet loaded. While at that, it also associates the device with 582 * the phy using devres. On driver detach, release function is invoked 583 * on the devres data, then, devres data is freed. 584 * 585 * For use by USB host and peripheral drivers. 586 */ 587 struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, 588 const char *phandle, u8 index) 589 { 590 struct device_node *node; 591 struct usb_phy *phy; 592 593 if (!dev->of_node) { 594 dev_dbg(dev, "device does not have a device node entry\n"); 595 return ERR_PTR(-EINVAL); 596 } 597 598 node = of_parse_phandle(dev->of_node, phandle, index); 599 if (!node) { 600 dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle, 601 dev->of_node); 602 return ERR_PTR(-ENODEV); 603 } 604 phy = devm_usb_get_phy_by_node(dev, node, NULL); 605 of_node_put(node); 606 return phy; 607 } 608 EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle); 609 610 /** 611 * usb_put_phy - release the USB PHY 612 * @x: the phy returned by usb_get_phy() 613 * 614 * Releases a refcount the caller received from usb_get_phy(). 615 * 616 * For use by USB host and peripheral drivers. 617 */ 618 void usb_put_phy(struct usb_phy *x) 619 { 620 if (x) { 621 struct module *owner = x->dev->driver->owner; 622 623 put_device(x->dev); 624 module_put(owner); 625 } 626 } 627 EXPORT_SYMBOL_GPL(usb_put_phy); 628 629 /** 630 * usb_add_phy: declare the USB PHY 631 * @x: the USB phy to be used; or NULL 632 * @type: the type of this PHY 633 * 634 * This call is exclusively for use by phy drivers, which 635 * coordinate the activities of drivers for host and peripheral 636 * controllers, and in some cases for VBUS current regulation. 637 */ 638 int usb_add_phy(struct usb_phy *x, enum usb_phy_type type) 639 { 640 int ret = 0; 641 unsigned long flags; 642 struct usb_phy *phy; 643 644 if (x->type != USB_PHY_TYPE_UNDEFINED) { 645 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label); 646 return -EINVAL; 647 } 648 649 usb_charger_init(x); 650 ret = usb_add_extcon(x); 651 if (ret) 652 return ret; 653 654 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier); 655 656 spin_lock_irqsave(&phy_lock, flags); 657 658 list_for_each_entry(phy, &phy_list, head) { 659 if (phy->type == type) { 660 ret = -EBUSY; 661 dev_err(x->dev, "transceiver type %s already exists\n", 662 usb_phy_type_string(type)); 663 goto out; 664 } 665 } 666 667 x->type = type; 668 list_add_tail(&x->head, &phy_list); 669 670 out: 671 spin_unlock_irqrestore(&phy_lock, flags); 672 return ret; 673 } 674 EXPORT_SYMBOL_GPL(usb_add_phy); 675 676 static const struct device_type usb_phy_dev_type = { 677 .name = "usb_phy", 678 .uevent = usb_phy_uevent, 679 }; 680 681 /** 682 * usb_add_phy_dev - declare the USB PHY 683 * @x: the USB phy to be used; or NULL 684 * 685 * This call is exclusively for use by phy drivers, which 686 * coordinate the activities of drivers for host and peripheral 687 * controllers, and in some cases for VBUS current regulation. 688 */ 689 int usb_add_phy_dev(struct usb_phy *x) 690 { 691 unsigned long flags; 692 int ret; 693 694 if (!x->dev) { 695 dev_err(x->dev, "no device provided for PHY\n"); 696 return -EINVAL; 697 } 698 699 usb_charger_init(x); 700 ret = usb_add_extcon(x); 701 if (ret) 702 return ret; 703 704 x->dev->type = &usb_phy_dev_type; 705 706 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier); 707 708 spin_lock_irqsave(&phy_lock, flags); 709 list_add_tail(&x->head, &phy_list); 710 spin_unlock_irqrestore(&phy_lock, flags); 711 712 return 0; 713 } 714 EXPORT_SYMBOL_GPL(usb_add_phy_dev); 715 716 /** 717 * usb_remove_phy - remove the OTG PHY 718 * @x: the USB OTG PHY to be removed; 719 * 720 * This reverts the effects of usb_add_phy 721 */ 722 void usb_remove_phy(struct usb_phy *x) 723 { 724 unsigned long flags; 725 726 spin_lock_irqsave(&phy_lock, flags); 727 if (x) 728 list_del(&x->head); 729 spin_unlock_irqrestore(&phy_lock, flags); 730 } 731 EXPORT_SYMBOL_GPL(usb_remove_phy); 732 733 /** 734 * usb_phy_set_event - set event to phy event 735 * @x: the phy returned by usb_get_phy(); 736 * @event: event to set 737 * 738 * This sets event to phy event 739 */ 740 void usb_phy_set_event(struct usb_phy *x, unsigned long event) 741 { 742 x->last_event = event; 743 } 744 EXPORT_SYMBOL_GPL(usb_phy_set_event); 745