1 /* 2 * Core driver for the pin control subsystem 3 * 4 * Copyright (C) 2011-2012 ST-Ericsson SA 5 * Written on behalf of Linaro for ST-Ericsson 6 * Based on bits of regulator core, gpio core and clk core 7 * 8 * Author: Linus Walleij <linus.walleij@linaro.org> 9 * 10 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. 11 * 12 * License terms: GNU General Public License (GPL) version 2 13 */ 14 #define pr_fmt(fmt) "pinctrl core: " fmt 15 16 #include <linux/kernel.h> 17 #include <linux/export.h> 18 #include <linux/init.h> 19 #include <linux/device.h> 20 #include <linux/slab.h> 21 #include <linux/err.h> 22 #include <linux/list.h> 23 #include <linux/sysfs.h> 24 #include <linux/debugfs.h> 25 #include <linux/seq_file.h> 26 #include <linux/pinctrl/consumer.h> 27 #include <linux/pinctrl/pinctrl.h> 28 #include <linux/pinctrl/machine.h> 29 #include "core.h" 30 #include "devicetree.h" 31 #include "pinmux.h" 32 #include "pinconf.h" 33 34 /** 35 * struct pinctrl_maps - a list item containing part of the mapping table 36 * @node: mapping table list node 37 * @maps: array of mapping table entries 38 * @num_maps: the number of entries in @maps 39 */ 40 struct pinctrl_maps { 41 struct list_head node; 42 struct pinctrl_map const *maps; 43 unsigned num_maps; 44 }; 45 46 static bool pinctrl_dummy_state; 47 48 /* Mutex taken by all entry points */ 49 DEFINE_MUTEX(pinctrl_mutex); 50 51 /* Global list of pin control devices (struct pinctrl_dev) */ 52 LIST_HEAD(pinctrldev_list); 53 54 /* List of pin controller handles (struct pinctrl) */ 55 static LIST_HEAD(pinctrl_list); 56 57 /* List of pinctrl maps (struct pinctrl_maps) */ 58 static LIST_HEAD(pinctrl_maps); 59 60 #define for_each_maps(_maps_node_, _i_, _map_) \ 61 list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ 62 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ 63 _i_ < _maps_node_->num_maps; \ 64 _i_++, _map_ = &_maps_node_->maps[_i_]) 65 66 /** 67 * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support 68 * 69 * Usually this function is called by platforms without pinctrl driver support 70 * but run with some shared drivers using pinctrl APIs. 71 * After calling this function, the pinctrl core will return successfully 72 * with creating a dummy state for the driver to keep going smoothly. 73 */ 74 void pinctrl_provide_dummies(void) 75 { 76 pinctrl_dummy_state = true; 77 } 78 79 const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) 80 { 81 /* We're not allowed to register devices without name */ 82 return pctldev->desc->name; 83 } 84 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); 85 86 void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) 87 { 88 return pctldev->driver_data; 89 } 90 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); 91 92 /** 93 * get_pinctrl_dev_from_devname() - look up pin controller device 94 * @devname: the name of a device instance, as returned by dev_name() 95 * 96 * Looks up a pin control device matching a certain device name or pure device 97 * pointer, the pure device pointer will take precedence. 98 */ 99 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) 100 { 101 struct pinctrl_dev *pctldev = NULL; 102 bool found = false; 103 104 if (!devname) 105 return NULL; 106 107 list_for_each_entry(pctldev, &pinctrldev_list, node) { 108 if (!strcmp(dev_name(pctldev->dev), devname)) { 109 /* Matched on device name */ 110 found = true; 111 break; 112 } 113 } 114 115 return found ? pctldev : NULL; 116 } 117 118 /** 119 * pin_get_from_name() - look up a pin number from a name 120 * @pctldev: the pin control device to lookup the pin on 121 * @name: the name of the pin to look up 122 */ 123 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) 124 { 125 unsigned i, pin; 126 127 /* The pin number can be retrived from the pin controller descriptor */ 128 for (i = 0; i < pctldev->desc->npins; i++) { 129 struct pin_desc *desc; 130 131 pin = pctldev->desc->pins[i].number; 132 desc = pin_desc_get(pctldev, pin); 133 /* Pin space may be sparse */ 134 if (desc == NULL) 135 continue; 136 if (desc->name && !strcmp(name, desc->name)) 137 return pin; 138 } 139 140 return -EINVAL; 141 } 142 143 /** 144 * pin_get_name_from_id() - look up a pin name from a pin id 145 * @pctldev: the pin control device to lookup the pin on 146 * @name: the name of the pin to look up 147 */ 148 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin) 149 { 150 const struct pin_desc *desc; 151 152 desc = pin_desc_get(pctldev, pin); 153 if (desc == NULL) { 154 dev_err(pctldev->dev, "failed to get pin(%d) name\n", 155 pin); 156 return NULL; 157 } 158 159 return desc->name; 160 } 161 162 /** 163 * pin_is_valid() - check if pin exists on controller 164 * @pctldev: the pin control device to check the pin on 165 * @pin: pin to check, use the local pin controller index number 166 * 167 * This tells us whether a certain pin exist on a certain pin controller or 168 * not. Pin lists may be sparse, so some pins may not exist. 169 */ 170 bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) 171 { 172 struct pin_desc *pindesc; 173 174 if (pin < 0) 175 return false; 176 177 mutex_lock(&pinctrl_mutex); 178 pindesc = pin_desc_get(pctldev, pin); 179 mutex_unlock(&pinctrl_mutex); 180 181 return pindesc != NULL; 182 } 183 EXPORT_SYMBOL_GPL(pin_is_valid); 184 185 /* Deletes a range of pin descriptors */ 186 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, 187 const struct pinctrl_pin_desc *pins, 188 unsigned num_pins) 189 { 190 int i; 191 192 for (i = 0; i < num_pins; i++) { 193 struct pin_desc *pindesc; 194 195 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, 196 pins[i].number); 197 if (pindesc != NULL) { 198 radix_tree_delete(&pctldev->pin_desc_tree, 199 pins[i].number); 200 if (pindesc->dynamic_name) 201 kfree(pindesc->name); 202 } 203 kfree(pindesc); 204 } 205 } 206 207 static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, 208 unsigned number, const char *name) 209 { 210 struct pin_desc *pindesc; 211 212 pindesc = pin_desc_get(pctldev, number); 213 if (pindesc != NULL) { 214 pr_err("pin %d already registered on %s\n", number, 215 pctldev->desc->name); 216 return -EINVAL; 217 } 218 219 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); 220 if (pindesc == NULL) { 221 dev_err(pctldev->dev, "failed to alloc struct pin_desc\n"); 222 return -ENOMEM; 223 } 224 225 /* Set owner */ 226 pindesc->pctldev = pctldev; 227 228 /* Copy basic pin info */ 229 if (name) { 230 pindesc->name = name; 231 } else { 232 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); 233 if (pindesc->name == NULL) { 234 kfree(pindesc); 235 return -ENOMEM; 236 } 237 pindesc->dynamic_name = true; 238 } 239 240 radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); 241 pr_debug("registered pin %d (%s) on %s\n", 242 number, pindesc->name, pctldev->desc->name); 243 return 0; 244 } 245 246 static int pinctrl_register_pins(struct pinctrl_dev *pctldev, 247 struct pinctrl_pin_desc const *pins, 248 unsigned num_descs) 249 { 250 unsigned i; 251 int ret = 0; 252 253 for (i = 0; i < num_descs; i++) { 254 ret = pinctrl_register_one_pin(pctldev, 255 pins[i].number, pins[i].name); 256 if (ret) 257 return ret; 258 } 259 260 return 0; 261 } 262 263 /** 264 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range 265 * @pctldev: pin controller device to check 266 * @gpio: gpio pin to check taken from the global GPIO pin space 267 * 268 * Tries to match a GPIO pin number to the ranges handled by a certain pin 269 * controller, return the range or NULL 270 */ 271 static struct pinctrl_gpio_range * 272 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) 273 { 274 struct pinctrl_gpio_range *range = NULL; 275 276 /* Loop over the ranges */ 277 list_for_each_entry(range, &pctldev->gpio_ranges, node) { 278 /* Check if we're in the valid range */ 279 if (gpio >= range->base && 280 gpio < range->base + range->npins) { 281 return range; 282 } 283 } 284 285 return NULL; 286 } 287 288 /** 289 * pinctrl_get_device_gpio_range() - find device for GPIO range 290 * @gpio: the pin to locate the pin controller for 291 * @outdev: the pin control device if found 292 * @outrange: the GPIO range if found 293 * 294 * Find the pin controller handling a certain GPIO pin from the pinspace of 295 * the GPIO subsystem, return the device and the matching GPIO range. Returns 296 * -EPROBE_DEFER if the GPIO range could not be found in any device since it 297 * may still have not been registered. 298 */ 299 static int pinctrl_get_device_gpio_range(unsigned gpio, 300 struct pinctrl_dev **outdev, 301 struct pinctrl_gpio_range **outrange) 302 { 303 struct pinctrl_dev *pctldev = NULL; 304 305 /* Loop over the pin controllers */ 306 list_for_each_entry(pctldev, &pinctrldev_list, node) { 307 struct pinctrl_gpio_range *range; 308 309 range = pinctrl_match_gpio_range(pctldev, gpio); 310 if (range != NULL) { 311 *outdev = pctldev; 312 *outrange = range; 313 return 0; 314 } 315 } 316 317 return -EPROBE_DEFER; 318 } 319 320 /** 321 * pinctrl_add_gpio_range() - register a GPIO range for a controller 322 * @pctldev: pin controller device to add the range to 323 * @range: the GPIO range to add 324 * 325 * This adds a range of GPIOs to be handled by a certain pin controller. Call 326 * this to register handled ranges after registering your pin controller. 327 */ 328 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, 329 struct pinctrl_gpio_range *range) 330 { 331 mutex_lock(&pinctrl_mutex); 332 list_add_tail(&range->node, &pctldev->gpio_ranges); 333 mutex_unlock(&pinctrl_mutex); 334 } 335 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); 336 337 void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev, 338 struct pinctrl_gpio_range *ranges, 339 unsigned nranges) 340 { 341 int i; 342 343 for (i = 0; i < nranges; i++) 344 pinctrl_add_gpio_range(pctldev, &ranges[i]); 345 } 346 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges); 347 348 struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, 349 struct pinctrl_gpio_range *range) 350 { 351 struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname); 352 353 /* 354 * If we can't find this device, let's assume that is because 355 * it has not probed yet, so the driver trying to register this 356 * range need to defer probing. 357 */ 358 if (!pctldev) 359 return ERR_PTR(-EPROBE_DEFER); 360 361 pinctrl_add_gpio_range(pctldev, range); 362 return pctldev; 363 } 364 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); 365 366 /** 367 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin 368 * @pctldev: the pin controller device to look in 369 * @pin: a controller-local number to find the range for 370 */ 371 struct pinctrl_gpio_range * 372 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, 373 unsigned int pin) 374 { 375 struct pinctrl_gpio_range *range = NULL; 376 377 /* Loop over the ranges */ 378 list_for_each_entry(range, &pctldev->gpio_ranges, node) { 379 /* Check if we're in the valid range */ 380 if (pin >= range->pin_base && 381 pin < range->pin_base + range->npins) { 382 return range; 383 } 384 } 385 386 return NULL; 387 } 388 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); 389 390 /** 391 * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller 392 * @pctldev: pin controller device to remove the range from 393 * @range: the GPIO range to remove 394 */ 395 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, 396 struct pinctrl_gpio_range *range) 397 { 398 mutex_lock(&pinctrl_mutex); 399 list_del(&range->node); 400 mutex_unlock(&pinctrl_mutex); 401 } 402 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); 403 404 /** 405 * pinctrl_get_group_selector() - returns the group selector for a group 406 * @pctldev: the pin controller handling the group 407 * @pin_group: the pin group to look up 408 */ 409 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, 410 const char *pin_group) 411 { 412 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; 413 unsigned ngroups = pctlops->get_groups_count(pctldev); 414 unsigned group_selector = 0; 415 416 while (group_selector < ngroups) { 417 const char *gname = pctlops->get_group_name(pctldev, 418 group_selector); 419 if (!strcmp(gname, pin_group)) { 420 dev_dbg(pctldev->dev, 421 "found group selector %u for %s\n", 422 group_selector, 423 pin_group); 424 return group_selector; 425 } 426 427 group_selector++; 428 } 429 430 dev_err(pctldev->dev, "does not have pin group %s\n", 431 pin_group); 432 433 return -EINVAL; 434 } 435 436 /** 437 * pinctrl_request_gpio() - request a single pin to be used in as GPIO 438 * @gpio: the GPIO pin number from the GPIO subsystem number space 439 * 440 * This function should *ONLY* be used from gpiolib-based GPIO drivers, 441 * as part of their gpio_request() semantics, platforms and individual drivers 442 * shall *NOT* request GPIO pins to be muxed in. 443 */ 444 int pinctrl_request_gpio(unsigned gpio) 445 { 446 struct pinctrl_dev *pctldev; 447 struct pinctrl_gpio_range *range; 448 int ret; 449 int pin; 450 451 mutex_lock(&pinctrl_mutex); 452 453 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); 454 if (ret) { 455 mutex_unlock(&pinctrl_mutex); 456 return ret; 457 } 458 459 /* Convert to the pin controllers number space */ 460 pin = gpio - range->base + range->pin_base; 461 462 ret = pinmux_request_gpio(pctldev, range, pin, gpio); 463 464 mutex_unlock(&pinctrl_mutex); 465 return ret; 466 } 467 EXPORT_SYMBOL_GPL(pinctrl_request_gpio); 468 469 /** 470 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO 471 * @gpio: the GPIO pin number from the GPIO subsystem number space 472 * 473 * This function should *ONLY* be used from gpiolib-based GPIO drivers, 474 * as part of their gpio_free() semantics, platforms and individual drivers 475 * shall *NOT* request GPIO pins to be muxed out. 476 */ 477 void pinctrl_free_gpio(unsigned gpio) 478 { 479 struct pinctrl_dev *pctldev; 480 struct pinctrl_gpio_range *range; 481 int ret; 482 int pin; 483 484 mutex_lock(&pinctrl_mutex); 485 486 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); 487 if (ret) { 488 mutex_unlock(&pinctrl_mutex); 489 return; 490 } 491 492 /* Convert to the pin controllers number space */ 493 pin = gpio - range->base + range->pin_base; 494 495 pinmux_free_gpio(pctldev, pin, range); 496 497 mutex_unlock(&pinctrl_mutex); 498 } 499 EXPORT_SYMBOL_GPL(pinctrl_free_gpio); 500 501 static int pinctrl_gpio_direction(unsigned gpio, bool input) 502 { 503 struct pinctrl_dev *pctldev; 504 struct pinctrl_gpio_range *range; 505 int ret; 506 int pin; 507 508 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); 509 if (ret) 510 return ret; 511 512 /* Convert to the pin controllers number space */ 513 pin = gpio - range->base + range->pin_base; 514 515 return pinmux_gpio_direction(pctldev, range, pin, input); 516 } 517 518 /** 519 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode 520 * @gpio: the GPIO pin number from the GPIO subsystem number space 521 * 522 * This function should *ONLY* be used from gpiolib-based GPIO drivers, 523 * as part of their gpio_direction_input() semantics, platforms and individual 524 * drivers shall *NOT* touch pin control GPIO calls. 525 */ 526 int pinctrl_gpio_direction_input(unsigned gpio) 527 { 528 int ret; 529 mutex_lock(&pinctrl_mutex); 530 ret = pinctrl_gpio_direction(gpio, true); 531 mutex_unlock(&pinctrl_mutex); 532 return ret; 533 } 534 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); 535 536 /** 537 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode 538 * @gpio: the GPIO pin number from the GPIO subsystem number space 539 * 540 * This function should *ONLY* be used from gpiolib-based GPIO drivers, 541 * as part of their gpio_direction_output() semantics, platforms and individual 542 * drivers shall *NOT* touch pin control GPIO calls. 543 */ 544 int pinctrl_gpio_direction_output(unsigned gpio) 545 { 546 int ret; 547 mutex_lock(&pinctrl_mutex); 548 ret = pinctrl_gpio_direction(gpio, false); 549 mutex_unlock(&pinctrl_mutex); 550 return ret; 551 } 552 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); 553 554 static struct pinctrl_state *find_state(struct pinctrl *p, 555 const char *name) 556 { 557 struct pinctrl_state *state; 558 559 list_for_each_entry(state, &p->states, node) 560 if (!strcmp(state->name, name)) 561 return state; 562 563 return NULL; 564 } 565 566 static struct pinctrl_state *create_state(struct pinctrl *p, 567 const char *name) 568 { 569 struct pinctrl_state *state; 570 571 state = kzalloc(sizeof(*state), GFP_KERNEL); 572 if (state == NULL) { 573 dev_err(p->dev, 574 "failed to alloc struct pinctrl_state\n"); 575 return ERR_PTR(-ENOMEM); 576 } 577 578 state->name = name; 579 INIT_LIST_HEAD(&state->settings); 580 581 list_add_tail(&state->node, &p->states); 582 583 return state; 584 } 585 586 static int add_setting(struct pinctrl *p, struct pinctrl_map const *map) 587 { 588 struct pinctrl_state *state; 589 struct pinctrl_setting *setting; 590 int ret; 591 592 state = find_state(p, map->name); 593 if (!state) 594 state = create_state(p, map->name); 595 if (IS_ERR(state)) 596 return PTR_ERR(state); 597 598 if (map->type == PIN_MAP_TYPE_DUMMY_STATE) 599 return 0; 600 601 setting = kzalloc(sizeof(*setting), GFP_KERNEL); 602 if (setting == NULL) { 603 dev_err(p->dev, 604 "failed to alloc struct pinctrl_setting\n"); 605 return -ENOMEM; 606 } 607 608 setting->type = map->type; 609 610 setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); 611 if (setting->pctldev == NULL) { 612 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", 613 map->ctrl_dev_name); 614 kfree(setting); 615 /* 616 * OK let us guess that the driver is not there yet, and 617 * let's defer obtaining this pinctrl handle to later... 618 */ 619 return -EPROBE_DEFER; 620 } 621 622 setting->dev_name = map->dev_name; 623 624 switch (map->type) { 625 case PIN_MAP_TYPE_MUX_GROUP: 626 ret = pinmux_map_to_setting(map, setting); 627 break; 628 case PIN_MAP_TYPE_CONFIGS_PIN: 629 case PIN_MAP_TYPE_CONFIGS_GROUP: 630 ret = pinconf_map_to_setting(map, setting); 631 break; 632 default: 633 ret = -EINVAL; 634 break; 635 } 636 if (ret < 0) { 637 kfree(setting); 638 return ret; 639 } 640 641 list_add_tail(&setting->node, &state->settings); 642 643 return 0; 644 } 645 646 static struct pinctrl *find_pinctrl(struct device *dev) 647 { 648 struct pinctrl *p; 649 650 list_for_each_entry(p, &pinctrl_list, node) 651 if (p->dev == dev) 652 return p; 653 654 return NULL; 655 } 656 657 static void pinctrl_put_locked(struct pinctrl *p, bool inlist); 658 659 static struct pinctrl *create_pinctrl(struct device *dev) 660 { 661 struct pinctrl *p; 662 const char *devname; 663 struct pinctrl_maps *maps_node; 664 int i; 665 struct pinctrl_map const *map; 666 int ret; 667 668 /* 669 * create the state cookie holder struct pinctrl for each 670 * mapping, this is what consumers will get when requesting 671 * a pin control handle with pinctrl_get() 672 */ 673 p = kzalloc(sizeof(*p), GFP_KERNEL); 674 if (p == NULL) { 675 dev_err(dev, "failed to alloc struct pinctrl\n"); 676 return ERR_PTR(-ENOMEM); 677 } 678 p->dev = dev; 679 INIT_LIST_HEAD(&p->states); 680 INIT_LIST_HEAD(&p->dt_maps); 681 682 ret = pinctrl_dt_to_map(p); 683 if (ret < 0) { 684 kfree(p); 685 return ERR_PTR(ret); 686 } 687 688 devname = dev_name(dev); 689 690 /* Iterate over the pin control maps to locate the right ones */ 691 for_each_maps(maps_node, i, map) { 692 /* Map must be for this device */ 693 if (strcmp(map->dev_name, devname)) 694 continue; 695 696 ret = add_setting(p, map); 697 if (ret < 0) { 698 pinctrl_put_locked(p, false); 699 return ERR_PTR(ret); 700 } 701 } 702 703 /* Add the pinctrl handle to the global list */ 704 list_add_tail(&p->node, &pinctrl_list); 705 706 return p; 707 } 708 709 static struct pinctrl *pinctrl_get_locked(struct device *dev) 710 { 711 struct pinctrl *p; 712 713 if (WARN_ON(!dev)) 714 return ERR_PTR(-EINVAL); 715 716 p = find_pinctrl(dev); 717 if (p != NULL) 718 return ERR_PTR(-EBUSY); 719 720 return create_pinctrl(dev); 721 } 722 723 /** 724 * pinctrl_get() - retrieves the pinctrl handle for a device 725 * @dev: the device to obtain the handle for 726 */ 727 struct pinctrl *pinctrl_get(struct device *dev) 728 { 729 struct pinctrl *p; 730 731 mutex_lock(&pinctrl_mutex); 732 p = pinctrl_get_locked(dev); 733 mutex_unlock(&pinctrl_mutex); 734 735 return p; 736 } 737 EXPORT_SYMBOL_GPL(pinctrl_get); 738 739 static void pinctrl_put_locked(struct pinctrl *p, bool inlist) 740 { 741 struct pinctrl_state *state, *n1; 742 struct pinctrl_setting *setting, *n2; 743 744 list_for_each_entry_safe(state, n1, &p->states, node) { 745 list_for_each_entry_safe(setting, n2, &state->settings, node) { 746 switch (setting->type) { 747 case PIN_MAP_TYPE_MUX_GROUP: 748 if (state == p->state) 749 pinmux_disable_setting(setting); 750 pinmux_free_setting(setting); 751 break; 752 case PIN_MAP_TYPE_CONFIGS_PIN: 753 case PIN_MAP_TYPE_CONFIGS_GROUP: 754 pinconf_free_setting(setting); 755 break; 756 default: 757 break; 758 } 759 list_del(&setting->node); 760 kfree(setting); 761 } 762 list_del(&state->node); 763 kfree(state); 764 } 765 766 pinctrl_dt_free_maps(p); 767 768 if (inlist) 769 list_del(&p->node); 770 kfree(p); 771 } 772 773 /** 774 * pinctrl_put() - release a previously claimed pinctrl handle 775 * @p: the pinctrl handle to release 776 */ 777 void pinctrl_put(struct pinctrl *p) 778 { 779 mutex_lock(&pinctrl_mutex); 780 pinctrl_put_locked(p, true); 781 mutex_unlock(&pinctrl_mutex); 782 } 783 EXPORT_SYMBOL_GPL(pinctrl_put); 784 785 static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p, 786 const char *name) 787 { 788 struct pinctrl_state *state; 789 790 state = find_state(p, name); 791 if (!state) { 792 if (pinctrl_dummy_state) { 793 /* create dummy state */ 794 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n", 795 name); 796 state = create_state(p, name); 797 } else 798 state = ERR_PTR(-ENODEV); 799 } 800 801 return state; 802 } 803 804 /** 805 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle 806 * @p: the pinctrl handle to retrieve the state from 807 * @name: the state name to retrieve 808 */ 809 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name) 810 { 811 struct pinctrl_state *s; 812 813 mutex_lock(&pinctrl_mutex); 814 s = pinctrl_lookup_state_locked(p, name); 815 mutex_unlock(&pinctrl_mutex); 816 817 return s; 818 } 819 EXPORT_SYMBOL_GPL(pinctrl_lookup_state); 820 821 static int pinctrl_select_state_locked(struct pinctrl *p, 822 struct pinctrl_state *state) 823 { 824 struct pinctrl_setting *setting, *setting2; 825 int ret; 826 827 if (p->state == state) 828 return 0; 829 830 if (p->state) { 831 /* 832 * The set of groups with a mux configuration in the old state 833 * may not be identical to the set of groups with a mux setting 834 * in the new state. While this might be unusual, it's entirely 835 * possible for the "user"-supplied mapping table to be written 836 * that way. For each group that was configured in the old state 837 * but not in the new state, this code puts that group into a 838 * safe/disabled state. 839 */ 840 list_for_each_entry(setting, &p->state->settings, node) { 841 bool found = false; 842 if (setting->type != PIN_MAP_TYPE_MUX_GROUP) 843 continue; 844 list_for_each_entry(setting2, &state->settings, node) { 845 if (setting2->type != PIN_MAP_TYPE_MUX_GROUP) 846 continue; 847 if (setting2->data.mux.group == 848 setting->data.mux.group) { 849 found = true; 850 break; 851 } 852 } 853 if (!found) 854 pinmux_disable_setting(setting); 855 } 856 } 857 858 p->state = state; 859 860 /* Apply all the settings for the new state */ 861 list_for_each_entry(setting, &state->settings, node) { 862 switch (setting->type) { 863 case PIN_MAP_TYPE_MUX_GROUP: 864 ret = pinmux_enable_setting(setting); 865 break; 866 case PIN_MAP_TYPE_CONFIGS_PIN: 867 case PIN_MAP_TYPE_CONFIGS_GROUP: 868 ret = pinconf_apply_setting(setting); 869 break; 870 default: 871 ret = -EINVAL; 872 break; 873 } 874 if (ret < 0) { 875 /* FIXME: Difficult to return to prev state */ 876 return ret; 877 } 878 } 879 880 return 0; 881 } 882 883 /** 884 * pinctrl_select() - select/activate/program a pinctrl state to HW 885 * @p: the pinctrl handle for the device that requests configuratio 886 * @state: the state handle to select/activate/program 887 */ 888 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) 889 { 890 int ret; 891 892 mutex_lock(&pinctrl_mutex); 893 ret = pinctrl_select_state_locked(p, state); 894 mutex_unlock(&pinctrl_mutex); 895 896 return ret; 897 } 898 EXPORT_SYMBOL_GPL(pinctrl_select_state); 899 900 static void devm_pinctrl_release(struct device *dev, void *res) 901 { 902 pinctrl_put(*(struct pinctrl **)res); 903 } 904 905 /** 906 * struct devm_pinctrl_get() - Resource managed pinctrl_get() 907 * @dev: the device to obtain the handle for 908 * 909 * If there is a need to explicitly destroy the returned struct pinctrl, 910 * devm_pinctrl_put() should be used, rather than plain pinctrl_put(). 911 */ 912 struct pinctrl *devm_pinctrl_get(struct device *dev) 913 { 914 struct pinctrl **ptr, *p; 915 916 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); 917 if (!ptr) 918 return ERR_PTR(-ENOMEM); 919 920 p = pinctrl_get(dev); 921 if (!IS_ERR(p)) { 922 *ptr = p; 923 devres_add(dev, ptr); 924 } else { 925 devres_free(ptr); 926 } 927 928 return p; 929 } 930 EXPORT_SYMBOL_GPL(devm_pinctrl_get); 931 932 static int devm_pinctrl_match(struct device *dev, void *res, void *data) 933 { 934 struct pinctrl **p = res; 935 936 return *p == data; 937 } 938 939 /** 940 * devm_pinctrl_put() - Resource managed pinctrl_put() 941 * @p: the pinctrl handle to release 942 * 943 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally 944 * this function will not need to be called and the resource management 945 * code will ensure that the resource is freed. 946 */ 947 void devm_pinctrl_put(struct pinctrl *p) 948 { 949 WARN_ON(devres_destroy(p->dev, devm_pinctrl_release, 950 devm_pinctrl_match, p)); 951 pinctrl_put(p); 952 } 953 EXPORT_SYMBOL_GPL(devm_pinctrl_put); 954 955 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, 956 bool dup, bool locked) 957 { 958 int i, ret; 959 struct pinctrl_maps *maps_node; 960 961 pr_debug("add %d pinmux maps\n", num_maps); 962 963 /* First sanity check the new mapping */ 964 for (i = 0; i < num_maps; i++) { 965 if (!maps[i].dev_name) { 966 pr_err("failed to register map %s (%d): no device given\n", 967 maps[i].name, i); 968 return -EINVAL; 969 } 970 971 if (!maps[i].name) { 972 pr_err("failed to register map %d: no map name given\n", 973 i); 974 return -EINVAL; 975 } 976 977 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && 978 !maps[i].ctrl_dev_name) { 979 pr_err("failed to register map %s (%d): no pin control device given\n", 980 maps[i].name, i); 981 return -EINVAL; 982 } 983 984 switch (maps[i].type) { 985 case PIN_MAP_TYPE_DUMMY_STATE: 986 break; 987 case PIN_MAP_TYPE_MUX_GROUP: 988 ret = pinmux_validate_map(&maps[i], i); 989 if (ret < 0) 990 return ret; 991 break; 992 case PIN_MAP_TYPE_CONFIGS_PIN: 993 case PIN_MAP_TYPE_CONFIGS_GROUP: 994 ret = pinconf_validate_map(&maps[i], i); 995 if (ret < 0) 996 return ret; 997 break; 998 default: 999 pr_err("failed to register map %s (%d): invalid type given\n", 1000 maps[i].name, i); 1001 return -EINVAL; 1002 } 1003 } 1004 1005 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); 1006 if (!maps_node) { 1007 pr_err("failed to alloc struct pinctrl_maps\n"); 1008 return -ENOMEM; 1009 } 1010 1011 maps_node->num_maps = num_maps; 1012 if (dup) { 1013 maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, 1014 GFP_KERNEL); 1015 if (!maps_node->maps) { 1016 pr_err("failed to duplicate mapping table\n"); 1017 kfree(maps_node); 1018 return -ENOMEM; 1019 } 1020 } else { 1021 maps_node->maps = maps; 1022 } 1023 1024 if (!locked) 1025 mutex_lock(&pinctrl_mutex); 1026 list_add_tail(&maps_node->node, &pinctrl_maps); 1027 if (!locked) 1028 mutex_unlock(&pinctrl_mutex); 1029 1030 return 0; 1031 } 1032 1033 /** 1034 * pinctrl_register_mappings() - register a set of pin controller mappings 1035 * @maps: the pincontrol mappings table to register. This should probably be 1036 * marked with __initdata so it can be discarded after boot. This 1037 * function will perform a shallow copy for the mapping entries. 1038 * @num_maps: the number of maps in the mapping table 1039 */ 1040 int pinctrl_register_mappings(struct pinctrl_map const *maps, 1041 unsigned num_maps) 1042 { 1043 return pinctrl_register_map(maps, num_maps, true, false); 1044 } 1045 1046 void pinctrl_unregister_map(struct pinctrl_map const *map) 1047 { 1048 struct pinctrl_maps *maps_node; 1049 1050 list_for_each_entry(maps_node, &pinctrl_maps, node) { 1051 if (maps_node->maps == map) { 1052 list_del(&maps_node->node); 1053 return; 1054 } 1055 } 1056 } 1057 1058 #ifdef CONFIG_DEBUG_FS 1059 1060 static int pinctrl_pins_show(struct seq_file *s, void *what) 1061 { 1062 struct pinctrl_dev *pctldev = s->private; 1063 const struct pinctrl_ops *ops = pctldev->desc->pctlops; 1064 unsigned i, pin; 1065 1066 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); 1067 1068 mutex_lock(&pinctrl_mutex); 1069 1070 /* The pin number can be retrived from the pin controller descriptor */ 1071 for (i = 0; i < pctldev->desc->npins; i++) { 1072 struct pin_desc *desc; 1073 1074 pin = pctldev->desc->pins[i].number; 1075 desc = pin_desc_get(pctldev, pin); 1076 /* Pin space may be sparse */ 1077 if (desc == NULL) 1078 continue; 1079 1080 seq_printf(s, "pin %d (%s) ", pin, 1081 desc->name ? desc->name : "unnamed"); 1082 1083 /* Driver-specific info per pin */ 1084 if (ops->pin_dbg_show) 1085 ops->pin_dbg_show(pctldev, s, pin); 1086 1087 seq_puts(s, "\n"); 1088 } 1089 1090 mutex_unlock(&pinctrl_mutex); 1091 1092 return 0; 1093 } 1094 1095 static int pinctrl_groups_show(struct seq_file *s, void *what) 1096 { 1097 struct pinctrl_dev *pctldev = s->private; 1098 const struct pinctrl_ops *ops = pctldev->desc->pctlops; 1099 unsigned ngroups, selector = 0; 1100 1101 ngroups = ops->get_groups_count(pctldev); 1102 mutex_lock(&pinctrl_mutex); 1103 1104 seq_puts(s, "registered pin groups:\n"); 1105 while (selector < ngroups) { 1106 const unsigned *pins; 1107 unsigned num_pins; 1108 const char *gname = ops->get_group_name(pctldev, selector); 1109 const char *pname; 1110 int ret; 1111 int i; 1112 1113 ret = ops->get_group_pins(pctldev, selector, 1114 &pins, &num_pins); 1115 if (ret) 1116 seq_printf(s, "%s [ERROR GETTING PINS]\n", 1117 gname); 1118 else { 1119 seq_printf(s, "group: %s\n", gname); 1120 for (i = 0; i < num_pins; i++) { 1121 pname = pin_get_name(pctldev, pins[i]); 1122 if (WARN_ON(!pname)) { 1123 mutex_unlock(&pinctrl_mutex); 1124 return -EINVAL; 1125 } 1126 seq_printf(s, "pin %d (%s)\n", pins[i], pname); 1127 } 1128 seq_puts(s, "\n"); 1129 } 1130 selector++; 1131 } 1132 1133 mutex_unlock(&pinctrl_mutex); 1134 1135 return 0; 1136 } 1137 1138 static int pinctrl_gpioranges_show(struct seq_file *s, void *what) 1139 { 1140 struct pinctrl_dev *pctldev = s->private; 1141 struct pinctrl_gpio_range *range = NULL; 1142 1143 seq_puts(s, "GPIO ranges handled:\n"); 1144 1145 mutex_lock(&pinctrl_mutex); 1146 1147 /* Loop over the ranges */ 1148 list_for_each_entry(range, &pctldev->gpio_ranges, node) { 1149 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", 1150 range->id, range->name, 1151 range->base, (range->base + range->npins - 1), 1152 range->pin_base, 1153 (range->pin_base + range->npins - 1)); 1154 } 1155 1156 mutex_unlock(&pinctrl_mutex); 1157 1158 return 0; 1159 } 1160 1161 static int pinctrl_devices_show(struct seq_file *s, void *what) 1162 { 1163 struct pinctrl_dev *pctldev; 1164 1165 seq_puts(s, "name [pinmux] [pinconf]\n"); 1166 1167 mutex_lock(&pinctrl_mutex); 1168 1169 list_for_each_entry(pctldev, &pinctrldev_list, node) { 1170 seq_printf(s, "%s ", pctldev->desc->name); 1171 if (pctldev->desc->pmxops) 1172 seq_puts(s, "yes "); 1173 else 1174 seq_puts(s, "no "); 1175 if (pctldev->desc->confops) 1176 seq_puts(s, "yes"); 1177 else 1178 seq_puts(s, "no"); 1179 seq_puts(s, "\n"); 1180 } 1181 1182 mutex_unlock(&pinctrl_mutex); 1183 1184 return 0; 1185 } 1186 1187 static inline const char *map_type(enum pinctrl_map_type type) 1188 { 1189 static const char * const names[] = { 1190 "INVALID", 1191 "DUMMY_STATE", 1192 "MUX_GROUP", 1193 "CONFIGS_PIN", 1194 "CONFIGS_GROUP", 1195 }; 1196 1197 if (type >= ARRAY_SIZE(names)) 1198 return "UNKNOWN"; 1199 1200 return names[type]; 1201 } 1202 1203 static int pinctrl_maps_show(struct seq_file *s, void *what) 1204 { 1205 struct pinctrl_maps *maps_node; 1206 int i; 1207 struct pinctrl_map const *map; 1208 1209 seq_puts(s, "Pinctrl maps:\n"); 1210 1211 mutex_lock(&pinctrl_mutex); 1212 1213 for_each_maps(maps_node, i, map) { 1214 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", 1215 map->dev_name, map->name, map_type(map->type), 1216 map->type); 1217 1218 if (map->type != PIN_MAP_TYPE_DUMMY_STATE) 1219 seq_printf(s, "controlling device %s\n", 1220 map->ctrl_dev_name); 1221 1222 switch (map->type) { 1223 case PIN_MAP_TYPE_MUX_GROUP: 1224 pinmux_show_map(s, map); 1225 break; 1226 case PIN_MAP_TYPE_CONFIGS_PIN: 1227 case PIN_MAP_TYPE_CONFIGS_GROUP: 1228 pinconf_show_map(s, map); 1229 break; 1230 default: 1231 break; 1232 } 1233 1234 seq_printf(s, "\n"); 1235 } 1236 1237 mutex_unlock(&pinctrl_mutex); 1238 1239 return 0; 1240 } 1241 1242 static int pinctrl_show(struct seq_file *s, void *what) 1243 { 1244 struct pinctrl *p; 1245 struct pinctrl_state *state; 1246 struct pinctrl_setting *setting; 1247 1248 seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); 1249 1250 mutex_lock(&pinctrl_mutex); 1251 1252 list_for_each_entry(p, &pinctrl_list, node) { 1253 seq_printf(s, "device: %s current state: %s\n", 1254 dev_name(p->dev), 1255 p->state ? p->state->name : "none"); 1256 1257 list_for_each_entry(state, &p->states, node) { 1258 seq_printf(s, " state: %s\n", state->name); 1259 1260 list_for_each_entry(setting, &state->settings, node) { 1261 struct pinctrl_dev *pctldev = setting->pctldev; 1262 1263 seq_printf(s, " type: %s controller %s ", 1264 map_type(setting->type), 1265 pinctrl_dev_get_name(pctldev)); 1266 1267 switch (setting->type) { 1268 case PIN_MAP_TYPE_MUX_GROUP: 1269 pinmux_show_setting(s, setting); 1270 break; 1271 case PIN_MAP_TYPE_CONFIGS_PIN: 1272 case PIN_MAP_TYPE_CONFIGS_GROUP: 1273 pinconf_show_setting(s, setting); 1274 break; 1275 default: 1276 break; 1277 } 1278 } 1279 } 1280 } 1281 1282 mutex_unlock(&pinctrl_mutex); 1283 1284 return 0; 1285 } 1286 1287 static int pinctrl_pins_open(struct inode *inode, struct file *file) 1288 { 1289 return single_open(file, pinctrl_pins_show, inode->i_private); 1290 } 1291 1292 static int pinctrl_groups_open(struct inode *inode, struct file *file) 1293 { 1294 return single_open(file, pinctrl_groups_show, inode->i_private); 1295 } 1296 1297 static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) 1298 { 1299 return single_open(file, pinctrl_gpioranges_show, inode->i_private); 1300 } 1301 1302 static int pinctrl_devices_open(struct inode *inode, struct file *file) 1303 { 1304 return single_open(file, pinctrl_devices_show, NULL); 1305 } 1306 1307 static int pinctrl_maps_open(struct inode *inode, struct file *file) 1308 { 1309 return single_open(file, pinctrl_maps_show, NULL); 1310 } 1311 1312 static int pinctrl_open(struct inode *inode, struct file *file) 1313 { 1314 return single_open(file, pinctrl_show, NULL); 1315 } 1316 1317 static const struct file_operations pinctrl_pins_ops = { 1318 .open = pinctrl_pins_open, 1319 .read = seq_read, 1320 .llseek = seq_lseek, 1321 .release = single_release, 1322 }; 1323 1324 static const struct file_operations pinctrl_groups_ops = { 1325 .open = pinctrl_groups_open, 1326 .read = seq_read, 1327 .llseek = seq_lseek, 1328 .release = single_release, 1329 }; 1330 1331 static const struct file_operations pinctrl_gpioranges_ops = { 1332 .open = pinctrl_gpioranges_open, 1333 .read = seq_read, 1334 .llseek = seq_lseek, 1335 .release = single_release, 1336 }; 1337 1338 static const struct file_operations pinctrl_devices_ops = { 1339 .open = pinctrl_devices_open, 1340 .read = seq_read, 1341 .llseek = seq_lseek, 1342 .release = single_release, 1343 }; 1344 1345 static const struct file_operations pinctrl_maps_ops = { 1346 .open = pinctrl_maps_open, 1347 .read = seq_read, 1348 .llseek = seq_lseek, 1349 .release = single_release, 1350 }; 1351 1352 static const struct file_operations pinctrl_ops = { 1353 .open = pinctrl_open, 1354 .read = seq_read, 1355 .llseek = seq_lseek, 1356 .release = single_release, 1357 }; 1358 1359 static struct dentry *debugfs_root; 1360 1361 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) 1362 { 1363 struct dentry *device_root; 1364 1365 device_root = debugfs_create_dir(dev_name(pctldev->dev), 1366 debugfs_root); 1367 pctldev->device_root = device_root; 1368 1369 if (IS_ERR(device_root) || !device_root) { 1370 pr_warn("failed to create debugfs directory for %s\n", 1371 dev_name(pctldev->dev)); 1372 return; 1373 } 1374 debugfs_create_file("pins", S_IFREG | S_IRUGO, 1375 device_root, pctldev, &pinctrl_pins_ops); 1376 debugfs_create_file("pingroups", S_IFREG | S_IRUGO, 1377 device_root, pctldev, &pinctrl_groups_ops); 1378 debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, 1379 device_root, pctldev, &pinctrl_gpioranges_ops); 1380 pinmux_init_device_debugfs(device_root, pctldev); 1381 pinconf_init_device_debugfs(device_root, pctldev); 1382 } 1383 1384 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) 1385 { 1386 debugfs_remove_recursive(pctldev->device_root); 1387 } 1388 1389 static void pinctrl_init_debugfs(void) 1390 { 1391 debugfs_root = debugfs_create_dir("pinctrl", NULL); 1392 if (IS_ERR(debugfs_root) || !debugfs_root) { 1393 pr_warn("failed to create debugfs directory\n"); 1394 debugfs_root = NULL; 1395 return; 1396 } 1397 1398 debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, 1399 debugfs_root, NULL, &pinctrl_devices_ops); 1400 debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, 1401 debugfs_root, NULL, &pinctrl_maps_ops); 1402 debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, 1403 debugfs_root, NULL, &pinctrl_ops); 1404 } 1405 1406 #else /* CONFIG_DEBUG_FS */ 1407 1408 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) 1409 { 1410 } 1411 1412 static void pinctrl_init_debugfs(void) 1413 { 1414 } 1415 1416 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) 1417 { 1418 } 1419 1420 #endif 1421 1422 static int pinctrl_check_ops(struct pinctrl_dev *pctldev) 1423 { 1424 const struct pinctrl_ops *ops = pctldev->desc->pctlops; 1425 1426 if (!ops || 1427 !ops->get_groups_count || 1428 !ops->get_group_name || 1429 !ops->get_group_pins) 1430 return -EINVAL; 1431 1432 if (ops->dt_node_to_map && !ops->dt_free_map) 1433 return -EINVAL; 1434 1435 return 0; 1436 } 1437 1438 /** 1439 * pinctrl_register() - register a pin controller device 1440 * @pctldesc: descriptor for this pin controller 1441 * @dev: parent device for this pin controller 1442 * @driver_data: private pin controller data for this pin controller 1443 */ 1444 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, 1445 struct device *dev, void *driver_data) 1446 { 1447 struct pinctrl_dev *pctldev; 1448 int ret; 1449 1450 if (!pctldesc) 1451 return NULL; 1452 if (!pctldesc->name) 1453 return NULL; 1454 1455 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); 1456 if (pctldev == NULL) { 1457 dev_err(dev, "failed to alloc struct pinctrl_dev\n"); 1458 return NULL; 1459 } 1460 1461 /* Initialize pin control device struct */ 1462 pctldev->owner = pctldesc->owner; 1463 pctldev->desc = pctldesc; 1464 pctldev->driver_data = driver_data; 1465 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); 1466 INIT_LIST_HEAD(&pctldev->gpio_ranges); 1467 pctldev->dev = dev; 1468 1469 /* check core ops for sanity */ 1470 if (pinctrl_check_ops(pctldev)) { 1471 dev_err(dev, "pinctrl ops lacks necessary functions\n"); 1472 goto out_err; 1473 } 1474 1475 /* If we're implementing pinmuxing, check the ops for sanity */ 1476 if (pctldesc->pmxops) { 1477 if (pinmux_check_ops(pctldev)) 1478 goto out_err; 1479 } 1480 1481 /* If we're implementing pinconfig, check the ops for sanity */ 1482 if (pctldesc->confops) { 1483 if (pinconf_check_ops(pctldev)) 1484 goto out_err; 1485 } 1486 1487 /* Register all the pins */ 1488 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins); 1489 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); 1490 if (ret) { 1491 dev_err(dev, "error during pin registration\n"); 1492 pinctrl_free_pindescs(pctldev, pctldesc->pins, 1493 pctldesc->npins); 1494 goto out_err; 1495 } 1496 1497 mutex_lock(&pinctrl_mutex); 1498 1499 list_add_tail(&pctldev->node, &pinctrldev_list); 1500 1501 pctldev->p = pinctrl_get_locked(pctldev->dev); 1502 if (!IS_ERR(pctldev->p)) { 1503 struct pinctrl_state *s = 1504 pinctrl_lookup_state_locked(pctldev->p, 1505 PINCTRL_STATE_DEFAULT); 1506 if (IS_ERR(s)) { 1507 dev_dbg(dev, "failed to lookup the default state\n"); 1508 } else { 1509 if (pinctrl_select_state_locked(pctldev->p, s)) 1510 dev_err(dev, 1511 "failed to select default state\n"); 1512 } 1513 } 1514 1515 mutex_unlock(&pinctrl_mutex); 1516 1517 pinctrl_init_device_debugfs(pctldev); 1518 1519 return pctldev; 1520 1521 out_err: 1522 kfree(pctldev); 1523 return NULL; 1524 } 1525 EXPORT_SYMBOL_GPL(pinctrl_register); 1526 1527 /** 1528 * pinctrl_unregister() - unregister pinmux 1529 * @pctldev: pin controller to unregister 1530 * 1531 * Called by pinmux drivers to unregister a pinmux. 1532 */ 1533 void pinctrl_unregister(struct pinctrl_dev *pctldev) 1534 { 1535 struct pinctrl_gpio_range *range, *n; 1536 if (pctldev == NULL) 1537 return; 1538 1539 pinctrl_remove_device_debugfs(pctldev); 1540 1541 mutex_lock(&pinctrl_mutex); 1542 1543 if (!IS_ERR(pctldev->p)) 1544 pinctrl_put_locked(pctldev->p, true); 1545 1546 /* TODO: check that no pinmuxes are still active? */ 1547 list_del(&pctldev->node); 1548 /* Destroy descriptor tree */ 1549 pinctrl_free_pindescs(pctldev, pctldev->desc->pins, 1550 pctldev->desc->npins); 1551 /* remove gpio ranges map */ 1552 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node) 1553 list_del(&range->node); 1554 1555 kfree(pctldev); 1556 1557 mutex_unlock(&pinctrl_mutex); 1558 } 1559 EXPORT_SYMBOL_GPL(pinctrl_unregister); 1560 1561 static int __init pinctrl_init(void) 1562 { 1563 pr_info("initialized pinctrl subsystem\n"); 1564 pinctrl_init_debugfs(); 1565 return 0; 1566 } 1567 1568 /* init early since many drivers really need to initialized pinmux early */ 1569 core_initcall(pinctrl_init); 1570